enet.h 176 KB

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  1. /*
  2. * Custom fork of ENet reliable UDP networking library
  3. * Copyright (c) 2019-2020 Matt Coburn, Chris Burns
  4. * Copyright (c) 2018 Lee Salzman, Vladyslav Hrytsenko, Dominik Madarász, Stanislav Denisov
  5. *
  6. * Permission is hereby granted, free of charge, to any person obtaining a copy
  7. * of this software and associated documentation files (the "Software"), to deal
  8. * in the Software without restriction, including without limitation the rights
  9. * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10. * copies of the Software, and to permit persons to whom the Software is
  11. * furnished to do so, subject to the following conditions:
  12. *
  13. * The above copyright notice and this permission notice shall be included in all
  14. * copies or substantial portions of the Software.
  15. *
  16. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19. * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22. * SOFTWARE.
  23. */
  24. #ifndef ENET_H
  25. #define ENET_H
  26. #include <stdlib.h>
  27. #include <stdbool.h>
  28. #include <stdint.h>
  29. #include <time.h>
  30. #include "custom/enet_logging.h"
  31. #define ENET_VERSION_MAJOR 2
  32. #define ENET_VERSION_MINOR 4
  33. #define ENET_VERSION_PATCH 9
  34. #define ENET_VERSION_CREATE(major, minor, patch) (((major) << 16) | ((minor) << 8) | (patch))
  35. #define ENET_VERSION_GET_MAJOR(version) (((version) >> 16) & 0xFF)
  36. #define ENET_VERSION_GET_MINOR(version) (((version) >> 8) & 0xFF)
  37. #define ENET_VERSION_GET_PATCH(version) ((version) & 0xFF)
  38. #define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH)
  39. #define ENET_TIME_OVERFLOW 86400000
  40. #define ENET_TIME_LESS(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW)
  41. #define ENET_TIME_GREATER(a, b) ((b) - (a) >= ENET_TIME_OVERFLOW)
  42. #define ENET_TIME_LESS_EQUAL(a, b) (!ENET_TIME_GREATER(a, b))
  43. #define ENET_TIME_GREATER_EQUAL(a, b) (!ENET_TIME_LESS(a, b))
  44. #define ENET_TIME_DIFFERENCE(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW ? (b) - (a) : (a) - (b))
  45. #define ENET_MAX(x, y) ((x) > (y) ? (x) : (y))
  46. #define ENET_MIN(x, y) ((x) < (y) ? (x) : (y))
  47. /*
  48. =======================================================================
  49. System differences
  50. =======================================================================
  51. */
  52. #ifdef _WIN32
  53. #ifndef ENET_NO_PRAGMA_LINK
  54. #pragma comment(lib, "ws2_32.lib")
  55. #pragma comment(lib, "winmm.lib")
  56. #endif
  57. #if _MSC_VER >= 1910
  58. /* It looks like there were changes as of Visual Studio 2017 and there are no 32/64 bit
  59. versions of _InterlockedExchange[operation], only InterlockedExchange[operation]
  60. (without leading underscore), so we have to distinguish between compiler versions */
  61. #define ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  62. #endif
  63. #include <winsock2.h>
  64. #include <ws2tcpip.h>
  65. #include <mmsystem.h>
  66. #include <intrin.h>
  67. #if defined(_WIN32) && defined(_MSC_VER)
  68. #if _MSC_VER < 1900
  69. typedef struct timespec {
  70. long tv_sec;
  71. long tv_nsec;
  72. };
  73. #endif
  74. #define CLOCK_MONOTONIC 0
  75. #endif
  76. typedef SOCKET ENetSocket;
  77. #define ENET_SOCKET_NULL INVALID_SOCKET
  78. typedef struct {
  79. size_t dataLength;
  80. void* data;
  81. } ENetBuffer;
  82. #define ENET_CALLBACK __cdecl
  83. #ifdef ENET_DLL
  84. #ifdef ENET_IMPLEMENTATION
  85. #define ENET_API __declspec(dllexport)
  86. #else
  87. #define ENET_API __declspec(dllimport)
  88. #endif
  89. #else
  90. #define ENET_API extern
  91. #endif
  92. #else
  93. #include <sys/types.h>
  94. #include <sys/ioctl.h>
  95. #include <sys/time.h>
  96. #include <sys/socket.h>
  97. #include <poll.h>
  98. #include <arpa/inet.h>
  99. #include <netinet/in.h>
  100. #include <netinet/tcp.h>
  101. #include <netdb.h>
  102. #include <unistd.h>
  103. #include <string.h>
  104. #include <errno.h>
  105. #include <fcntl.h>
  106. #ifdef __APPLE__
  107. #include <mach/clock.h>
  108. #include <mach/mach.h>
  109. #include <Availability.h>
  110. #endif
  111. #ifndef MSG_NOSIGNAL
  112. #define MSG_NOSIGNAL 0
  113. #endif
  114. #ifdef MSG_MAXIOVLEN
  115. #define ENET_BUFFER_MAXIMUM MSG_MAXIOVLEN
  116. #endif
  117. typedef int ENetSocket;
  118. #define ENET_SOCKET_NULL -1
  119. typedef struct {
  120. void* data;
  121. size_t dataLength;
  122. } ENetBuffer;
  123. #define ENET_CALLBACK
  124. #define ENET_API extern
  125. #endif
  126. #ifndef ENET_BUFFER_MAXIMUM
  127. #define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS)
  128. #endif
  129. #define ENET_HOST_ANY in6addr_any
  130. #define ENET_PORT_ANY 0
  131. #define ENET_HOST_SIZE 1025
  132. #define ENET_HOST_TO_NET_16(value) (htons(value))
  133. #define ENET_HOST_TO_NET_32(value) (htonl(value))
  134. #define ENET_NET_TO_HOST_16(value) (ntohs(value))
  135. #define ENET_NET_TO_HOST_32(value) (ntohl(value))
  136. #if __BIG_ENDIAN__
  137. #define ENET_HOST_TO_NET_64(x) (x)
  138. #define ENET_NET_TO_HOST_64(x) (x)
  139. #else
  140. #define ENET_HOST_TO_NET_64(x) (((uint64_t)htonl((x) & 0xFFFFFFFF) << 32) | htonl((x) >> 32))
  141. #define ENET_NET_TO_HOST_64(x) (((uint64_t)ntohl((x) & 0xFFFFFFFF) << 32) | ntohl((x) >> 32))
  142. #endif
  143. #ifdef __cplusplus
  144. extern "C" {
  145. #endif
  146. /*
  147. =======================================================================
  148. Internals
  149. =======================================================================
  150. */
  151. typedef uint32_t ENetVersion;
  152. typedef fd_set ENetSocketSet;
  153. typedef struct _ENetCallbacks {
  154. void* (ENET_CALLBACK* malloc)(size_t size);
  155. void (ENET_CALLBACK* free)(void* memory);
  156. void (ENET_CALLBACK* noMemory)(void);
  157. } ENetCallbacks;
  158. extern void* enet_malloc(size_t);
  159. extern void enet_free(void*);
  160. typedef struct _ENetListNode {
  161. struct _ENetListNode* next;
  162. struct _ENetListNode* previous;
  163. } ENetListNode;
  164. typedef ENetListNode* ENetListIterator;
  165. typedef struct _ENetList {
  166. ENetListNode sentinel;
  167. } ENetList;
  168. extern ENetListIterator enet_list_insert(ENetListIterator, void*);
  169. extern ENetListIterator enet_list_move(ENetListIterator, void*, void*);
  170. extern void* enet_list_remove(ENetListIterator);
  171. extern void enet_list_clear(ENetList*);
  172. extern size_t enet_list_size(ENetList*);
  173. #define enet_list_begin(list) ((list)->sentinel.next)
  174. #define enet_list_end(list) (&(list)->sentinel)
  175. #define enet_list_empty(list) (enet_list_begin(list) == enet_list_end(list))
  176. #define enet_list_next(iterator) ((iterator)->next)
  177. #define enet_list_previous(iterator) ((iterator)->previous)
  178. #define enet_list_front(list) ((void*)(list)->sentinel.next)
  179. #define enet_list_back(list) ((void*)(list)->sentinel.previous)
  180. #define enet_in6_equal(a, b) (memcmp(&a, &b, sizeof(struct in6_addr)) == 0)
  181. /*
  182. =======================================================================
  183. Protocol
  184. =======================================================================
  185. */
  186. enum {
  187. ENET_PROTOCOL_MINIMUM_MTU = 576,
  188. ENET_PROTOCOL_MAXIMUM_MTU = 4096,
  189. ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS = 32,
  190. ENET_PROTOCOL_MINIMUM_WINDOW_SIZE = 4096,
  191. ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE = 65536,
  192. ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT = 1,
  193. ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT = 255,
  194. ENET_PROTOCOL_MAXIMUM_PEER_ID = 0xFFF,
  195. ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT = 1024 * 1024
  196. };
  197. typedef enum _ENetProtocolCommand {
  198. ENET_PROTOCOL_COMMAND_NONE = 0,
  199. ENET_PROTOCOL_COMMAND_ACKNOWLEDGE = 1,
  200. ENET_PROTOCOL_COMMAND_CONNECT = 2,
  201. ENET_PROTOCOL_COMMAND_VERIFY_CONNECT = 3,
  202. ENET_PROTOCOL_COMMAND_DISCONNECT = 4,
  203. ENET_PROTOCOL_COMMAND_PING = 5,
  204. ENET_PROTOCOL_COMMAND_SEND_RELIABLE = 6,
  205. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE = 7,
  206. ENET_PROTOCOL_COMMAND_SEND_FRAGMENT = 8,
  207. ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED = 9,
  208. ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT = 10,
  209. ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE = 11,
  210. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT = 12,
  211. ENET_PROTOCOL_COMMAND_COUNT = 13,
  212. ENET_PROTOCOL_COMMAND_MASK = 0x0F
  213. } ENetProtocolCommand;
  214. typedef enum _ENetProtocolFlag {
  215. ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE = (1 << 7),
  216. ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED = (1 << 6),
  217. ENET_PROTOCOL_HEADER_FLAG_SENT_TIME = (1 << 14),
  218. ENET_PROTOCOL_HEADER_FLAG_MASK = ENET_PROTOCOL_HEADER_FLAG_SENT_TIME,
  219. ENET_PROTOCOL_HEADER_SESSION_MASK = (3 << 12),
  220. ENET_PROTOCOL_HEADER_SESSION_SHIFT = 12
  221. } ENetProtocolFlag;
  222. #ifdef _MSC_VER
  223. #pragma pack(push, 1)
  224. #define ENET_PACKED
  225. #elif defined(__GNUC__) || defined(__clang__)
  226. #define ENET_PACKED __attribute__ ((packed))
  227. #else
  228. #define ENET_PACKED
  229. #endif
  230. typedef struct _ENetProtocolHeader {
  231. uint16_t peerID;
  232. uint16_t sentTime;
  233. } ENET_PACKED ENetProtocolHeader;
  234. typedef struct _ENetProtocolCommandHeader {
  235. uint8_t command;
  236. uint8_t channelID;
  237. uint16_t reliableSequenceNumber;
  238. } ENET_PACKED ENetProtocolCommandHeader;
  239. typedef struct _ENetProtocolAcknowledge {
  240. ENetProtocolCommandHeader header;
  241. uint16_t receivedReliableSequenceNumber;
  242. uint16_t receivedSentTime;
  243. } ENET_PACKED ENetProtocolAcknowledge;
  244. typedef struct _ENetProtocolConnect {
  245. ENetProtocolCommandHeader header;
  246. uint16_t outgoingPeerID;
  247. uint8_t incomingSessionID;
  248. uint8_t outgoingSessionID;
  249. uint32_t mtu;
  250. uint32_t windowSize;
  251. uint32_t channelCount;
  252. uint32_t incomingBandwidth;
  253. uint32_t outgoingBandwidth;
  254. uint32_t packetThrottleInterval;
  255. uint32_t packetThrottleAcceleration;
  256. uint32_t packetThrottleDeceleration;
  257. uint32_t connectID;
  258. uint32_t data;
  259. } ENET_PACKED ENetProtocolConnect;
  260. typedef struct _ENetProtocolVerifyConnect {
  261. ENetProtocolCommandHeader header;
  262. uint16_t outgoingPeerID;
  263. uint8_t incomingSessionID;
  264. uint8_t outgoingSessionID;
  265. uint32_t mtu;
  266. uint32_t windowSize;
  267. uint32_t channelCount;
  268. uint32_t incomingBandwidth;
  269. uint32_t outgoingBandwidth;
  270. uint32_t packetThrottleInterval;
  271. uint32_t packetThrottleAcceleration;
  272. uint32_t packetThrottleDeceleration;
  273. uint32_t connectID;
  274. } ENET_PACKED ENetProtocolVerifyConnect;
  275. typedef struct _ENetProtocolBandwidthLimit {
  276. ENetProtocolCommandHeader header;
  277. uint32_t incomingBandwidth;
  278. uint32_t outgoingBandwidth;
  279. } ENET_PACKED ENetProtocolBandwidthLimit;
  280. typedef struct _ENetProtocolThrottleConfigure {
  281. ENetProtocolCommandHeader header;
  282. uint32_t packetThrottleInterval;
  283. uint32_t packetThrottleAcceleration;
  284. uint32_t packetThrottleDeceleration;
  285. } ENET_PACKED ENetProtocolThrottleConfigure;
  286. typedef struct _ENetProtocolDisconnect {
  287. ENetProtocolCommandHeader header;
  288. uint32_t data;
  289. } ENET_PACKED ENetProtocolDisconnect;
  290. typedef struct _ENetProtocolPing {
  291. ENetProtocolCommandHeader header;
  292. } ENET_PACKED ENetProtocolPing;
  293. typedef struct _ENetProtocolSendReliable {
  294. ENetProtocolCommandHeader header;
  295. uint16_t dataLength;
  296. } ENET_PACKED ENetProtocolSendReliable;
  297. typedef struct _ENetProtocolSendUnreliable {
  298. ENetProtocolCommandHeader header;
  299. uint16_t unreliableSequenceNumber;
  300. uint16_t dataLength;
  301. } ENET_PACKED ENetProtocolSendUnreliable;
  302. typedef struct _ENetProtocolSendUnsequenced {
  303. ENetProtocolCommandHeader header;
  304. uint16_t unsequencedGroup;
  305. uint16_t dataLength;
  306. } ENET_PACKED ENetProtocolSendUnsequenced;
  307. typedef struct _ENetProtocolSendFragment {
  308. ENetProtocolCommandHeader header;
  309. uint16_t startSequenceNumber;
  310. uint16_t dataLength;
  311. uint32_t fragmentCount;
  312. uint32_t fragmentNumber;
  313. uint32_t totalLength;
  314. uint32_t fragmentOffset;
  315. } ENET_PACKED ENetProtocolSendFragment;
  316. typedef union _ENetProtocol {
  317. ENetProtocolCommandHeader header;
  318. ENetProtocolAcknowledge acknowledge;
  319. ENetProtocolConnect connect;
  320. ENetProtocolVerifyConnect verifyConnect;
  321. ENetProtocolDisconnect disconnect;
  322. ENetProtocolPing ping;
  323. ENetProtocolSendReliable sendReliable;
  324. ENetProtocolSendUnreliable sendUnreliable;
  325. ENetProtocolSendUnsequenced sendUnsequenced;
  326. ENetProtocolSendFragment sendFragment;
  327. ENetProtocolBandwidthLimit bandwidthLimit;
  328. ENetProtocolThrottleConfigure throttleConfigure;
  329. } ENET_PACKED ENetProtocol;
  330. #ifdef _MSC_VER
  331. #pragma pack(pop)
  332. #endif
  333. /*
  334. =======================================================================
  335. General structs/enums
  336. =======================================================================
  337. */
  338. typedef enum _ENetSocketType {
  339. ENET_SOCKET_TYPE_STREAM = 1,
  340. ENET_SOCKET_TYPE_DATAGRAM = 2
  341. } ENetSocketType;
  342. typedef enum _ENetSocketWait {
  343. ENET_SOCKET_WAIT_NONE = 0,
  344. ENET_SOCKET_WAIT_SEND = (1 << 0),
  345. ENET_SOCKET_WAIT_RECEIVE = (1 << 1),
  346. ENET_SOCKET_WAIT_INTERRUPT = (1 << 2)
  347. } ENetSocketWait;
  348. typedef enum _ENetSocketOption {
  349. ENET_SOCKOPT_NONBLOCK = 1,
  350. ENET_SOCKOPT_BROADCAST = 2,
  351. ENET_SOCKOPT_RCVBUF = 3,
  352. ENET_SOCKOPT_SNDBUF = 4,
  353. ENET_SOCKOPT_REUSEADDR = 5,
  354. ENET_SOCKOPT_RCVTIMEO = 6,
  355. ENET_SOCKOPT_SNDTIMEO = 7,
  356. ENET_SOCKOPT_ERROR = 8,
  357. ENET_SOCKOPT_NODELAY = 9,
  358. ENET_SOCKOPT_IPV6_V6ONLY = 10
  359. } ENetSocketOption;
  360. typedef enum _ENetSocketShutdown {
  361. ENET_SOCKET_SHUTDOWN_READ = 0,
  362. ENET_SOCKET_SHUTDOWN_WRITE = 1,
  363. ENET_SOCKET_SHUTDOWN_READ_WRITE = 2
  364. } ENetSocketShutdown;
  365. typedef struct _ENetAddress {
  366. union {
  367. struct in6_addr ipv6;
  368. struct {
  369. uint8_t zeros[10];
  370. uint16_t ffff;
  371. struct in_addr ip;
  372. } ipv4;
  373. };
  374. uint16_t port;
  375. } ENetAddress;
  376. typedef enum _ENetPacketFlag {
  377. ENET_PACKET_FLAG_NONE = 0,
  378. ENET_PACKET_FLAG_RELIABLE = (1 << 0),
  379. ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1),
  380. ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2),
  381. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED = (1 << 3),
  382. ENET_PACKET_FLAG_INSTANT = (1 << 4),
  383. ENET_PACKET_FLAG_UNTHROTTLED = (1 << 5),
  384. ENET_PACKET_FLAG_SENT = (1 << 8)
  385. } ENetPacketFlag;
  386. typedef void (ENET_CALLBACK* ENetPacketFreeCallback)(void*);
  387. typedef struct _ENetPacket {
  388. uint32_t flags;
  389. uint32_t dataLength;
  390. uint8_t* data;
  391. ENetPacketFreeCallback freeCallback;
  392. uint32_t referenceCount;
  393. void* userData;
  394. } ENetPacket;
  395. typedef struct _ENetAcknowledgement {
  396. ENetListNode acknowledgementList;
  397. uint32_t sentTime;
  398. ENetProtocol command;
  399. } ENetAcknowledgement;
  400. typedef struct _ENetOutgoingCommand {
  401. ENetListNode outgoingCommandList;
  402. uint16_t reliableSequenceNumber;
  403. uint16_t unreliableSequenceNumber;
  404. uint32_t sentTime;
  405. uint32_t roundTripTimeout;
  406. uint32_t roundTripTimeoutLimit;
  407. uint32_t fragmentOffset;
  408. uint16_t fragmentLength;
  409. uint16_t sendAttempts;
  410. ENetProtocol command;
  411. ENetPacket* packet;
  412. } ENetOutgoingCommand;
  413. typedef struct _ENetIncomingCommand {
  414. ENetListNode incomingCommandList;
  415. uint16_t reliableSequenceNumber;
  416. uint16_t unreliableSequenceNumber;
  417. ENetProtocol command;
  418. uint32_t fragmentCount;
  419. uint32_t fragmentsRemaining;
  420. uint32_t* fragments;
  421. ENetPacket* packet;
  422. } ENetIncomingCommand;
  423. typedef enum _ENetPeerState {
  424. ENET_PEER_STATE_DISCONNECTED = 0,
  425. ENET_PEER_STATE_CONNECTING = 1,
  426. ENET_PEER_STATE_ACKNOWLEDGING_CONNECT = 2,
  427. ENET_PEER_STATE_CONNECTION_PENDING = 3,
  428. ENET_PEER_STATE_CONNECTION_SUCCEEDED = 4,
  429. ENET_PEER_STATE_CONNECTED = 5,
  430. ENET_PEER_STATE_DISCONNECT_LATER = 6,
  431. ENET_PEER_STATE_DISCONNECTING = 7,
  432. ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT = 8,
  433. ENET_PEER_STATE_ZOMBIE = 9
  434. } ENetPeerState;
  435. enum {
  436. ENET_HOST_BUFFER_SIZE_MIN = 256 * 1024,
  437. ENET_HOST_BUFFER_SIZE_MAX = 1024 * 1024,
  438. ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000,
  439. ENET_HOST_DEFAULT_MTU = 1280,
  440. ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024,
  441. ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
  442. ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 1,
  443. ENET_PEER_DEFAULT_PACKET_THROTTLE = 32,
  444. ENET_PEER_PACKET_THROTTLE_THRESHOLD = 40,
  445. ENET_PEER_PACKET_THROTTLE_SCALE = 32,
  446. ENET_PEER_PACKET_THROTTLE_COUNTER = 7,
  447. ENET_PEER_PACKET_THROTTLE_ACCELERATION = 2,
  448. ENET_PEER_PACKET_THROTTLE_DECELERATION = 2,
  449. ENET_PEER_PACKET_THROTTLE_INTERVAL = 5000,
  450. ENET_PEER_WINDOW_SIZE_SCALE = 64 * 1024,
  451. ENET_PEER_TIMEOUT_LIMIT = 32,
  452. ENET_PEER_TIMEOUT_MINIMUM = 5000,
  453. ENET_PEER_TIMEOUT_MAXIMUM = 30000,
  454. ENET_PEER_PING_INTERVAL = 250,
  455. ENET_PEER_UNSEQUENCED_WINDOWS = 64,
  456. ENET_PEER_UNSEQUENCED_WINDOW_SIZE = 1024,
  457. ENET_PEER_FREE_UNSEQUENCED_WINDOWS = 32,
  458. ENET_PEER_RELIABLE_WINDOWS = 16,
  459. ENET_PEER_RELIABLE_WINDOW_SIZE = 0x1000,
  460. ENET_PEER_FREE_RELIABLE_WINDOWS = 8
  461. };
  462. typedef struct _ENetChannel {
  463. uint16_t outgoingReliableSequenceNumber;
  464. uint16_t outgoingUnreliableSequenceNumber;
  465. uint16_t usedReliableWindows;
  466. uint16_t reliableWindows[ENET_PEER_RELIABLE_WINDOWS];
  467. uint16_t incomingReliableSequenceNumber;
  468. uint16_t incomingUnreliableSequenceNumber;
  469. ENetList incomingReliableCommands;
  470. ENetList incomingUnreliableCommands;
  471. } ENetChannel;
  472. typedef struct _ENetPeer {
  473. ENetListNode dispatchList;
  474. struct _ENetHost* host;
  475. uint16_t outgoingPeerID;
  476. uint16_t incomingPeerID;
  477. uint32_t connectID;
  478. uint8_t outgoingSessionID;
  479. uint8_t incomingSessionID;
  480. ENetAddress address;
  481. void* data;
  482. ENetPeerState state;
  483. ENetChannel* channels;
  484. size_t channelCount;
  485. uint32_t incomingBandwidth;
  486. uint32_t outgoingBandwidth;
  487. uint32_t incomingBandwidthThrottleEpoch;
  488. uint32_t outgoingBandwidthThrottleEpoch;
  489. uint32_t incomingDataTotal;
  490. uint64_t totalDataReceived;
  491. uint32_t outgoingDataTotal;
  492. uint64_t totalDataSent;
  493. uint32_t lastSendTime;
  494. uint32_t lastReceiveTime;
  495. uint32_t nextTimeout;
  496. uint32_t earliestTimeout;
  497. uint64_t totalPacketsSent;
  498. uint64_t totalPacketsLost;
  499. uint32_t packetThrottle;
  500. uint32_t packetThrottleThreshold;
  501. uint32_t packetThrottleLimit;
  502. uint32_t packetThrottleCounter;
  503. uint32_t packetThrottleEpoch;
  504. uint32_t packetThrottleAcceleration;
  505. uint32_t packetThrottleDeceleration;
  506. uint32_t packetThrottleInterval;
  507. uint32_t pingInterval;
  508. uint32_t timeoutLimit;
  509. uint32_t timeoutMinimum;
  510. uint32_t timeoutMaximum;
  511. uint32_t lastRoundTripTime;
  512. uint32_t lowestRoundTripTime;
  513. uint32_t lastRoundTripTimeVariance;
  514. uint32_t highestRoundTripTimeVariance;
  515. uint32_t roundTripTime;
  516. uint32_t roundTripTimeVariance;
  517. uint32_t mtu;
  518. uint32_t windowSize;
  519. uint32_t reliableDataInTransit;
  520. uint16_t outgoingReliableSequenceNumber;
  521. ENetList acknowledgements;
  522. ENetList sentReliableCommands;
  523. ENetList sentUnreliableCommands;
  524. ENetList outgoingCommands;
  525. ENetList dispatchedCommands;
  526. int needsDispatch;
  527. uint16_t incomingUnsequencedGroup;
  528. uint16_t outgoingUnsequencedGroup;
  529. uint32_t unsequencedWindow[ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32];
  530. uint32_t eventData;
  531. size_t totalWaitingData;
  532. } ENetPeer;
  533. typedef enum _ENetEventType {
  534. ENET_EVENT_TYPE_NONE = 0,
  535. ENET_EVENT_TYPE_CONNECT = 1,
  536. ENET_EVENT_TYPE_DISCONNECT = 2,
  537. ENET_EVENT_TYPE_RECEIVE = 3,
  538. ENET_EVENT_TYPE_DISCONNECT_TIMEOUT = 4
  539. } ENetEventType;
  540. typedef struct _ENetEvent {
  541. ENetEventType type;
  542. ENetPeer* peer;
  543. uint8_t channelID;
  544. uint32_t data;
  545. ENetPacket* packet;
  546. } ENetEvent;
  547. typedef uint64_t(ENET_CALLBACK* ENetChecksumCallback)(const ENetBuffer* buffers, int bufferCount);
  548. typedef int (ENET_CALLBACK* ENetInterceptCallback)(ENetEvent* event, ENetAddress* address, uint8_t* receivedData, int receivedDataLength);
  549. typedef struct _ENetHost {
  550. ENetSocket socket;
  551. ENetAddress address;
  552. uint32_t incomingBandwidth;
  553. uint32_t outgoingBandwidth;
  554. uint32_t bandwidthThrottleEpoch;
  555. uint32_t mtu;
  556. uint32_t randomSeed;
  557. int recalculateBandwidthLimits;
  558. uint8_t preventConnections;
  559. ENetPeer* peers;
  560. size_t peerCount;
  561. size_t channelLimit;
  562. uint32_t serviceTime;
  563. ENetList dispatchQueue;
  564. int continueSending;
  565. size_t packetSize;
  566. uint16_t headerFlags;
  567. uint32_t totalSentData;
  568. uint32_t totalSentPackets;
  569. uint32_t totalReceivedData;
  570. uint32_t totalReceivedPackets;
  571. ENetProtocol commands[ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
  572. size_t commandCount;
  573. ENetBuffer buffers[ENET_BUFFER_MAXIMUM];
  574. size_t bufferCount;
  575. ENetChecksumCallback checksumCallback;
  576. uint8_t packetData[2][ENET_PROTOCOL_MAXIMUM_MTU];
  577. ENetAddress receivedAddress;
  578. uint8_t* receivedData;
  579. size_t receivedDataLength;
  580. ENetInterceptCallback interceptCallback;
  581. size_t connectedPeers;
  582. size_t bandwidthLimitedPeers;
  583. size_t duplicatePeers;
  584. size_t maximumPacketSize;
  585. size_t maximumWaitingData;
  586. } ENetHost;
  587. /*
  588. =======================================================================
  589. Public API
  590. =======================================================================
  591. */
  592. ENET_API int enet_initialize(void);
  593. ENET_API int enet_initialize_with_callbacks(ENetVersion, const ENetCallbacks*);
  594. ENET_API void enet_deinitialize(void);
  595. ENET_API ENetVersion enet_linked_version(void);
  596. ENET_API int enet_array_is_zeroed(const uint8_t*, int);
  597. ENET_API uint32_t enet_time_get(void);
  598. ENET_API uint64_t enet_crc64(const ENetBuffer*, int);
  599. ENET_API ENetPacket* enet_packet_create(const void*, size_t, uint32_t);
  600. ENET_API ENetPacket* enet_packet_create_offset(const void*, size_t, size_t, uint32_t);
  601. ENET_API void enet_packet_destroy(ENetPacket*);
  602. ENET_API int enet_peer_send(ENetPeer*, uint8_t, ENetPacket*);
  603. ENET_API ENetPacket* enet_peer_receive(ENetPeer*, uint8_t*);
  604. ENET_API void enet_peer_ping(ENetPeer*);
  605. ENET_API void enet_peer_ping_interval(ENetPeer*, uint32_t);
  606. ENET_API void enet_peer_timeout(ENetPeer*, uint32_t, uint32_t, uint32_t);
  607. ENET_API void enet_peer_reset(ENetPeer*);
  608. ENET_API void enet_peer_disconnect(ENetPeer*, uint32_t);
  609. ENET_API void enet_peer_disconnect_now(ENetPeer*, uint32_t);
  610. ENET_API void enet_peer_disconnect_later(ENetPeer*, uint32_t);
  611. ENET_API void enet_peer_throttle_configure(ENetPeer*, uint32_t, uint32_t, uint32_t, uint32_t);
  612. ENET_API ENetHost* enet_host_create(const ENetAddress*, size_t, size_t, uint32_t, uint32_t, int);
  613. ENET_API void enet_host_destroy(ENetHost*);
  614. ENET_API void enet_host_prevent_connections(ENetHost*, uint8_t);
  615. ENET_API ENetPeer* enet_host_connect(ENetHost*, const ENetAddress*, size_t, uint32_t);
  616. ENET_API int enet_host_check_events(ENetHost*, ENetEvent*);
  617. ENET_API int enet_host_service(ENetHost*, ENetEvent*, uint32_t);
  618. ENET_API void enet_host_flush(ENetHost*);
  619. ENET_API void enet_host_broadcast(ENetHost*, uint8_t, ENetPacket*);
  620. ENET_API void enet_host_broadcast_exclude(ENetHost*, uint8_t, ENetPacket*, ENetPeer*);
  621. ENET_API void enet_host_broadcast_selective(ENetHost*, uint8_t, ENetPacket*, ENetPeer**, size_t);
  622. ENET_API void enet_host_channel_limit(ENetHost*, size_t);
  623. ENET_API void enet_host_bandwidth_limit(ENetHost*, uint32_t, uint32_t);
  624. ENET_API int enet_address_set_ip(ENetAddress*, const char*);
  625. ENET_API int enet_address_set_hostname(ENetAddress*, const char*);
  626. ENET_API int enet_address_get_ip(const ENetAddress*, char*, size_t);
  627. ENET_API int enet_address_get_hostname(const ENetAddress*, char*, size_t);
  628. ENET_API ENetSocket enet_socket_create(ENetSocketType);
  629. ENET_API int enet_socket_bind(ENetSocket, const ENetAddress*);
  630. ENET_API int enet_socket_get_address(ENetSocket, ENetAddress*);
  631. ENET_API int enet_socket_listen(ENetSocket, int);
  632. ENET_API ENetSocket enet_socket_accept(ENetSocket, ENetAddress*);
  633. ENET_API int enet_socket_connect(ENetSocket, const ENetAddress*);
  634. ENET_API int enet_socket_send(ENetSocket, const ENetAddress*, const ENetBuffer*, size_t);
  635. ENET_API int enet_socket_receive(ENetSocket, ENetAddress*, ENetBuffer*, size_t);
  636. ENET_API int enet_socket_wait(ENetSocket, uint32_t*, uint64_t);
  637. ENET_API int enet_socket_set_option(ENetSocket, ENetSocketOption, int);
  638. ENET_API int enet_socket_get_option(ENetSocket, ENetSocketOption, int*);
  639. ENET_API int enet_socket_shutdown(ENetSocket, ENetSocketShutdown);
  640. ENET_API void enet_socket_destroy(ENetSocket);
  641. ENET_API int enet_socket_set_select(ENetSocket, ENetSocketSet*, ENetSocketSet*, uint32_t);
  642. /* Extended API for easier binding in other programming languages */
  643. ENET_API void* enet_packet_get_data(const ENetPacket*);
  644. ENET_API void* enet_packet_get_user_data(const ENetPacket*);
  645. ENET_API void enet_packet_set_user_data(ENetPacket*, void* userData);
  646. ENET_API int enet_packet_get_length(const ENetPacket*);
  647. ENET_API void enet_packet_set_free_callback(ENetPacket*, ENetPacketFreeCallback);
  648. ENET_API int enet_packet_check_references(const ENetPacket*);
  649. ENET_API void enet_packet_dispose(ENetPacket*);
  650. ENET_API uint32_t enet_host_get_peers_count(const ENetHost*);
  651. ENET_API uint32_t enet_host_get_packets_sent(const ENetHost*);
  652. ENET_API uint32_t enet_host_get_packets_received(const ENetHost*);
  653. ENET_API uint32_t enet_host_get_bytes_sent(const ENetHost*);
  654. ENET_API uint32_t enet_host_get_bytes_received(const ENetHost*);
  655. ENET_API void enet_host_set_max_duplicate_peers(ENetHost*, uint16_t);
  656. ENET_API void enet_host_set_intercept_callback(ENetHost*, ENetInterceptCallback);
  657. ENET_API void enet_host_set_checksum_callback(ENetHost*, ENetChecksumCallback);
  658. ENET_API uint32_t enet_peer_get_id(const ENetPeer*);
  659. ENET_API int enet_peer_get_ip(const ENetPeer*, char*, size_t);
  660. ENET_API uint16_t enet_peer_get_port(const ENetPeer*);
  661. ENET_API uint32_t enet_peer_get_mtu(const ENetPeer*);
  662. ENET_API ENetPeerState enet_peer_get_state(const ENetPeer*);
  663. ENET_API uint32_t enet_peer_get_rtt(const ENetPeer*);
  664. ENET_API uint32_t enet_peer_get_last_rtt(const ENetPeer* peer);
  665. ENET_API uint32_t enet_peer_get_lastsendtime(const ENetPeer*);
  666. ENET_API uint32_t enet_peer_get_lastreceivetime(const ENetPeer*);
  667. ENET_API uint64_t enet_peer_get_packets_sent(const ENetPeer*);
  668. ENET_API uint64_t enet_peer_get_packets_lost(const ENetPeer*);
  669. ENET_API float enet_peer_get_packets_throttle(const ENetPeer*);
  670. ENET_API uint64_t enet_peer_get_bytes_sent(const ENetPeer*);
  671. ENET_API uint64_t enet_peer_get_bytes_received(const ENetPeer*);
  672. ENET_API void* enet_peer_get_data(const ENetPeer*);
  673. ENET_API void enet_peer_set_data(ENetPeer*, const void*);
  674. /*
  675. =======================================================================
  676. Private API
  677. =======================================================================
  678. */
  679. extern void enet_host_bandwidth_throttle(ENetHost*);
  680. extern uint64_t enet_host_random_seed(void);
  681. extern int enet_peer_throttle(ENetPeer*, uint32_t);
  682. extern void enet_peer_reset_queues(ENetPeer*);
  683. extern void enet_peer_setup_outgoing_command(ENetPeer*, ENetOutgoingCommand*);
  684. extern ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer*, const ENetProtocol*, ENetPacket*, uint32_t, uint16_t);
  685. extern ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer*, const ENetProtocol*, const void*, size_t, uint32_t, uint32_t);
  686. extern ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer*, const ENetProtocol*, uint16_t);
  687. extern void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer*, ENetChannel*, ENetIncomingCommand*);
  688. extern void enet_peer_dispatch_incoming_reliable_commands(ENetPeer*, ENetChannel*, ENetIncomingCommand*);
  689. extern void enet_peer_on_connect(ENetPeer*);
  690. extern void enet_peer_on_disconnect(ENetPeer*);
  691. extern size_t enet_protocol_command_size(uint8_t);
  692. #ifdef __cplusplus
  693. }
  694. #endif
  695. #if defined(ENET_IMPLEMENTATION) && !defined(ENET_IMPLEMENTATION_DONE)
  696. #define ENET_IMPLEMENTATION_DONE 1
  697. #ifdef _MSC_VER
  698. #pragma warning(push)
  699. #pragma warning(disable: 4244) /* 64-bit to 32-bit integer conversion */
  700. #pragma warning(disable: 4267) /* size_t to integer conversion */
  701. #endif
  702. /*
  703. =======================================================================
  704. Atomics
  705. =======================================================================
  706. */
  707. #ifdef _MSC_VER
  708. #define ENET_AT_CASSERT_PRED(predicate) sizeof(char[2 * !!(predicate) - 1])
  709. #define ENET_IS_SUPPORTED_ATOMIC(size) ENET_AT_CASSERT_PRED(size == 1 || size == 2 || size == 4 || size == 8)
  710. #define ENET_ATOMIC_SIZEOF(variable) (ENET_IS_SUPPORTED_ATOMIC(sizeof(*(variable))), sizeof(*(variable)))
  711. __inline int64_t enet_at_atomic_read(char* ptr, size_t size) {
  712. switch (size) {
  713. case 1:
  714. return _InterlockedExchangeAdd8((volatile char*)ptr, 0);
  715. case 2:
  716. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, 0);
  717. case 4:
  718. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  719. return InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  720. #else
  721. return _InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  722. #endif
  723. case 8:
  724. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  725. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  726. #else
  727. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  728. #endif
  729. default:
  730. return 0x0;
  731. }
  732. }
  733. __inline int64_t enet_at_atomic_write(char* ptr, int64_t value, size_t size) {
  734. switch (size) {
  735. case 1:
  736. return _InterlockedExchange8((volatile char*)ptr, (char)value);
  737. case 2:
  738. return _InterlockedExchange16((volatile SHORT*)ptr, (SHORT)value);
  739. case 4:
  740. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  741. return InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  742. #else
  743. return _InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  744. #endif
  745. case 8:
  746. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  747. return InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  748. #else
  749. return _InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  750. #endif
  751. default:
  752. return 0x0;
  753. }
  754. }
  755. __inline int64_t enet_at_atomic_cas(char* ptr, int64_t new_val, int64_t old_val, size_t size) {
  756. switch (size) {
  757. case 1:
  758. return _InterlockedCompareExchange8((volatile char*)ptr, (char)new_val, (char)old_val);
  759. case 2:
  760. return _InterlockedCompareExchange16((volatile SHORT*)ptr, (SHORT)new_val, (SHORT)old_val);
  761. case 4:
  762. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  763. return InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  764. #else
  765. return _InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  766. #endif
  767. case 8:
  768. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  769. return InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  770. #else
  771. return _InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  772. #endif
  773. default:
  774. return 0x0;
  775. }
  776. }
  777. __inline int64_t enet_at_atomic_inc(char* ptr, int64_t delta, size_t data_size) {
  778. switch (data_size) {
  779. case 1:
  780. return _InterlockedExchangeAdd8((volatile char*)ptr, (char)delta);
  781. case 2:
  782. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, (SHORT)delta);
  783. case 4:
  784. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  785. return InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  786. #else
  787. return _InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  788. #endif
  789. case 8:
  790. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  791. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  792. #else
  793. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  794. #endif
  795. default:
  796. return 0x0;
  797. }
  798. }
  799. #define ENET_ATOMIC_READ(variable) enet_at_atomic_read((char*)(variable), ENET_ATOMIC_SIZEOF(variable))
  800. #define ENET_ATOMIC_WRITE(variable, new_val) enet_at_atomic_write((char*)(variable), (int64_t)(new_val), ENET_ATOMIC_SIZEOF(variable))
  801. #define ENET_ATOMIC_CAS(variable, old_value, new_val) enet_at_atomic_cas((char*)(variable), (int64_t)(new_val), (int64_t)(old_value), ENET_ATOMIC_SIZEOF(variable))
  802. #define ENET_ATOMIC_INC(variable) enet_at_atomic_inc((char*)(variable), 1, ENET_ATOMIC_SIZEOF(variable))
  803. #define ENET_ATOMIC_DEC(variable) enet_at_atomic_inc((char*)(variable), -1, ENET_ATOMIC_SIZEOF(variable))
  804. #define ENET_ATOMIC_INC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), (delta), ENET_ATOMIC_SIZEOF(variable))
  805. #define ENET_ATOMIC_DEC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), -(delta), ENET_ATOMIC_SIZEOF(variable))
  806. #elif defined(__GNUC__) || defined(__clang__)
  807. #if defined(__clang__) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
  808. #define AT_HAVE_ATOMICS
  809. #endif
  810. /* We want to use __atomic built-ins if possible because the __sync primitives are
  811. deprecated, because the __atomic build-ins allow us to use ENET_ATOMIC_WRITE on
  812. uninitialized memory without running into undefined behavior, and because the
  813. __atomic versions generate more efficient code since we don't need to rely on
  814. CAS when we don't actually want it.
  815. Note that we use acquire-release memory order (like mutexes do). We could use
  816. sequentially consistent memory order but that has lower performance and is
  817. almost always unneeded. */
  818. #ifdef AT_HAVE_ATOMICS
  819. #define ENET_ATOMIC_READ(ptr) __atomic_load_n((ptr), __ATOMIC_ACQUIRE)
  820. #define ENET_ATOMIC_WRITE(ptr, value) __atomic_store_n((ptr), (value), __ATOMIC_RELEASE)
  821. #ifndef typeof
  822. #define typeof __typeof__
  823. #endif
  824. /* clang_analyzer doesn't know that CAS writes to memory so it complains about
  825. potentially lost data. Replace the code with the equivalent non-sync code. */
  826. #ifdef __clang_analyzer__
  827. #define ENET_ATOMIC_CAS(ptr, old_value, new_value)\
  828. ({\
  829. typeof(*(ptr)) ENET_ATOMIC_CAS_old_actual_ = (*(ptr));\
  830. if (ATOMIC_CAS_old_actual_ == (old_value))\
  831. *(ptr) = new_value;\
  832. ENET_ATOMIC_CAS_old_actual_;\
  833. })
  834. #else
  835. /* Could use __auto_type instead of typeof but that shouldn't work in C++.
  836. The ({ }) syntax is a GCC extension called statement expression. It lets
  837. us return a value out of the macro.
  838. TODO We should return bool here instead of the old value to avoid the ABA
  839. problem. */
  840. #define ENET_ATOMIC_CAS(ptr, old_value, new_value)\
  841. ({\
  842. typeof(*(ptr)) ENET_ATOMIC_CAS_expected_ = (old_value);\
  843. __atomic_compare_exchange_n((ptr), &ENET_ATOMIC_CAS_expected_, (new_value), false,\
  844. __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE);\
  845. ENET_ATOMIC_CAS_expected_;\
  846. })
  847. #endif
  848. #define ENET_ATOMIC_INC(ptr) __atomic_fetch_add((ptr), 1, __ATOMIC_ACQ_REL)
  849. #define ENET_ATOMIC_DEC(ptr) __atomic_fetch_sub((ptr), 1, __ATOMIC_ACQ_REL)
  850. #define ENET_ATOMIC_INC_BY(ptr, delta) __atomic_fetch_add((ptr), (delta), __ATOMIC_ACQ_REL)
  851. #define ENET_ATOMIC_DEC_BY(ptr, delta) __atomic_fetch_sub((ptr), (delta), __ATOMIC_ACQ_REL)
  852. #else
  853. #define ENET_ATOMIC_READ(variable) __sync_fetch_and_add(variable, 0)
  854. #define ENET_ATOMIC_WRITE(variable, new_val) (void)__sync_val_compare_and_swap((variable), *(variable), (new_val))
  855. #define ENET_ATOMIC_CAS(variable, old_value, new_val) __sync_val_compare_and_swap((variable), (old_value), (new_val))
  856. #define ENET_ATOMIC_INC(variable) __sync_fetch_and_add((variable), 1)
  857. #define ENET_ATOMIC_DEC(variable) __sync_fetch_and_sub((variable), 1)
  858. #define ENET_ATOMIC_INC_BY(variable, delta) __sync_fetch_and_add((variable), (delta), 1)
  859. #define ENET_ATOMIC_DEC_BY(variable, delta) __sync_fetch_and_sub((variable), (delta), 1)
  860. #endif
  861. #undef AT_HAVE_ATOMICS
  862. #endif
  863. /*
  864. =======================================================================
  865. Callbacks
  866. =======================================================================
  867. */
  868. static ENetCallbacks callbacks = {
  869. malloc,
  870. free,
  871. abort
  872. };
  873. int enet_initialize_with_callbacks(ENetVersion version, const ENetCallbacks* inits) {
  874. if (version < ENET_VERSION_CREATE(1, 3, 0)) {
  875. ENET_LOG_ERROR("ENet version is too old");
  876. return -1;
  877. }
  878. if (inits->malloc != NULL || inits->free != NULL) {
  879. if (inits->malloc == NULL || inits->free == NULL) {
  880. ENET_LOG_ERROR("Memory allocator/free mechanism is NULL");
  881. return -1;
  882. }
  883. callbacks.malloc = inits->malloc;
  884. callbacks.free = inits->free;
  885. }
  886. if (inits->noMemory != NULL)
  887. callbacks.noMemory = inits->noMemory;
  888. return enet_initialize();
  889. }
  890. void* enet_malloc(size_t size) {
  891. void* memory = callbacks.malloc(size);
  892. if (memory == NULL)
  893. callbacks.noMemory();
  894. return memory;
  895. }
  896. void enet_free(void* memory) {
  897. callbacks.free(memory);
  898. }
  899. /*
  900. =======================================================================
  901. List
  902. =======================================================================
  903. */
  904. void enet_list_clear(ENetList* list) {
  905. list->sentinel.next = &list->sentinel;
  906. list->sentinel.previous = &list->sentinel;
  907. }
  908. ENetListIterator enet_list_insert(ENetListIterator position, void* data) {
  909. ENetListIterator result = (ENetListIterator)data;
  910. result->previous = position->previous;
  911. result->next = position;
  912. result->previous->next = result;
  913. position->previous = result;
  914. return result;
  915. }
  916. void* enet_list_remove(ENetListIterator position) {
  917. position->previous->next = position->next;
  918. position->next->previous = position->previous;
  919. return position;
  920. }
  921. ENetListIterator enet_list_move(ENetListIterator position, void* dataFirst, void* dataLast) {
  922. ENetListIterator first = (ENetListIterator)dataFirst;
  923. ENetListIterator last = (ENetListIterator)dataLast;
  924. first->previous->next = last->next;
  925. last->next->previous = first->previous;
  926. first->previous = position->previous;
  927. last->next = position;
  928. first->previous->next = first;
  929. position->previous = last;
  930. return first;
  931. }
  932. size_t enet_list_size(ENetList* list) {
  933. size_t size = 0;
  934. ENetListIterator position;
  935. for (position = enet_list_begin(list); position != enet_list_end(list); position = enet_list_next(position)) {
  936. ++size;
  937. }
  938. return size;
  939. }
  940. /*
  941. =======================================================================
  942. Utilities
  943. =======================================================================
  944. */
  945. ENetVersion enet_linked_version(void) {
  946. return ENET_VERSION;
  947. }
  948. int enet_array_is_zeroed(const uint8_t* array, int length) {
  949. size_t i;
  950. for (i = 0; i < length; i++) {
  951. if (array[i] != 0)
  952. return -1;
  953. }
  954. return 0;
  955. }
  956. /*
  957. =======================================================================
  958. Time
  959. =======================================================================
  960. */
  961. #ifdef _WIN32
  962. static LARGE_INTEGER gettime_offset(void) {
  963. SYSTEMTIME s;
  964. FILETIME f;
  965. LARGE_INTEGER t;
  966. s.wYear = 1970;
  967. s.wMonth = 1;
  968. s.wDay = 1;
  969. s.wHour = 0;
  970. s.wMinute = 0;
  971. s.wSecond = 0;
  972. s.wMilliseconds = 0;
  973. SystemTimeToFileTime(&s, &f);
  974. t.QuadPart = f.dwHighDateTime;
  975. t.QuadPart <<= 32;
  976. t.QuadPart |= f.dwLowDateTime;
  977. return t;
  978. }
  979. int clock_gettime(int X, struct timespec* tv) {
  980. LARGE_INTEGER t;
  981. FILETIME f;
  982. double microseconds;
  983. static LARGE_INTEGER offset;
  984. static double frequencyToMicroseconds;
  985. static int initialized = 0;
  986. static BOOL usePerformanceCounter = 0;
  987. if (!initialized) {
  988. LARGE_INTEGER performanceFrequency;
  989. initialized = 1;
  990. usePerformanceCounter = QueryPerformanceFrequency(&performanceFrequency);
  991. if (usePerformanceCounter) {
  992. QueryPerformanceCounter(&offset);
  993. frequencyToMicroseconds = (double)performanceFrequency.QuadPart / 1000000.;
  994. }
  995. else {
  996. offset = gettime_offset();
  997. frequencyToMicroseconds = 10.;
  998. }
  999. }
  1000. if (usePerformanceCounter) {
  1001. QueryPerformanceCounter(&t);
  1002. }
  1003. else {
  1004. GetSystemTimeAsFileTime(&f);
  1005. t.QuadPart = f.dwHighDateTime;
  1006. t.QuadPart <<= 32;
  1007. t.QuadPart |= f.dwLowDateTime;
  1008. }
  1009. t.QuadPart -= offset.QuadPart;
  1010. microseconds = (double)t.QuadPart / frequencyToMicroseconds;
  1011. t.QuadPart = (LONGLONG)microseconds;
  1012. tv->tv_sec = (long)(t.QuadPart / 1000000);
  1013. tv->tv_nsec = t.QuadPart % 1000000 * 1000;
  1014. return 0;
  1015. }
  1016. #elif __APPLE__ && (__MAC_OS_X_VERSION_MIN_REQUIRED < 101200 || __IPHONE_OS_VERSION_MIN_REQUIRED < 100000) && !defined(CLOCK_MONOTONIC)
  1017. #define CLOCK_MONOTONIC 0
  1018. int clock_gettime(int X, struct timespec* ts) {
  1019. clock_serv_t cclock;
  1020. mach_timespec_t mts;
  1021. host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
  1022. clock_get_time(cclock, &mts);
  1023. mach_port_deallocate(mach_task_self(), cclock);
  1024. ts->tv_sec = mts.tv_sec;
  1025. ts->tv_nsec = mts.tv_nsec;
  1026. return 0;
  1027. }
  1028. #endif
  1029. uint32_t enet_time_get(void) {
  1030. static uint64_t start_time_ns = 0;
  1031. struct timespec ts;
  1032. #ifdef CLOCK_MONOTONIC_RAW
  1033. clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
  1034. #else
  1035. clock_gettime(CLOCK_MONOTONIC, &ts);
  1036. #endif
  1037. static const uint64_t ns_in_s = 1000 * 1000 * 1000;
  1038. static const uint64_t ns_in_ms = 1000 * 1000;
  1039. uint64_t current_time_ns = ts.tv_nsec + (uint64_t)ts.tv_sec * ns_in_s;
  1040. uint64_t offset_ns = ENET_ATOMIC_READ(&start_time_ns);
  1041. if (offset_ns == 0) {
  1042. uint64_t want_value = current_time_ns - 1 * ns_in_ms;
  1043. uint64_t old_value = ENET_ATOMIC_CAS(&start_time_ns, 0, want_value);
  1044. offset_ns = old_value == 0 ? want_value : old_value;
  1045. }
  1046. uint64_t result_in_ns = current_time_ns - offset_ns;
  1047. return (uint32_t)(result_in_ns / ns_in_ms);
  1048. }
  1049. /*
  1050. =======================================================================
  1051. Checksum
  1052. =======================================================================
  1053. */
  1054. typedef uint64_t enet_checksum;
  1055. static const uint64_t crcTable[256] = {
  1056. UINT64_C(0x0000000000000000), UINT64_C(0x7ad870c830358979),
  1057. UINT64_C(0xf5b0e190606b12f2), UINT64_C(0x8f689158505e9b8b),
  1058. UINT64_C(0xc038e5739841b68f), UINT64_C(0xbae095bba8743ff6),
  1059. UINT64_C(0x358804e3f82aa47d), UINT64_C(0x4f50742bc81f2d04),
  1060. UINT64_C(0xab28ecb46814fe75), UINT64_C(0xd1f09c7c5821770c),
  1061. UINT64_C(0x5e980d24087fec87), UINT64_C(0x24407dec384a65fe),
  1062. UINT64_C(0x6b1009c7f05548fa), UINT64_C(0x11c8790fc060c183),
  1063. UINT64_C(0x9ea0e857903e5a08), UINT64_C(0xe478989fa00bd371),
  1064. UINT64_C(0x7d08ff3b88be6f81), UINT64_C(0x07d08ff3b88be6f8),
  1065. UINT64_C(0x88b81eabe8d57d73), UINT64_C(0xf2606e63d8e0f40a),
  1066. UINT64_C(0xbd301a4810ffd90e), UINT64_C(0xc7e86a8020ca5077),
  1067. UINT64_C(0x4880fbd87094cbfc), UINT64_C(0x32588b1040a14285),
  1068. UINT64_C(0xd620138fe0aa91f4), UINT64_C(0xacf86347d09f188d),
  1069. UINT64_C(0x2390f21f80c18306), UINT64_C(0x594882d7b0f40a7f),
  1070. UINT64_C(0x1618f6fc78eb277b), UINT64_C(0x6cc0863448deae02),
  1071. UINT64_C(0xe3a8176c18803589), UINT64_C(0x997067a428b5bcf0),
  1072. UINT64_C(0xfa11fe77117cdf02), UINT64_C(0x80c98ebf2149567b),
  1073. UINT64_C(0x0fa11fe77117cdf0), UINT64_C(0x75796f2f41224489),
  1074. UINT64_C(0x3a291b04893d698d), UINT64_C(0x40f16bccb908e0f4),
  1075. UINT64_C(0xcf99fa94e9567b7f), UINT64_C(0xb5418a5cd963f206),
  1076. UINT64_C(0x513912c379682177), UINT64_C(0x2be1620b495da80e),
  1077. UINT64_C(0xa489f35319033385), UINT64_C(0xde51839b2936bafc),
  1078. UINT64_C(0x9101f7b0e12997f8), UINT64_C(0xebd98778d11c1e81),
  1079. UINT64_C(0x64b116208142850a), UINT64_C(0x1e6966e8b1770c73),
  1080. UINT64_C(0x8719014c99c2b083), UINT64_C(0xfdc17184a9f739fa),
  1081. UINT64_C(0x72a9e0dcf9a9a271), UINT64_C(0x08719014c99c2b08),
  1082. UINT64_C(0x4721e43f0183060c), UINT64_C(0x3df994f731b68f75),
  1083. UINT64_C(0xb29105af61e814fe), UINT64_C(0xc849756751dd9d87),
  1084. UINT64_C(0x2c31edf8f1d64ef6), UINT64_C(0x56e99d30c1e3c78f),
  1085. UINT64_C(0xd9810c6891bd5c04), UINT64_C(0xa3597ca0a188d57d),
  1086. UINT64_C(0xec09088b6997f879), UINT64_C(0x96d1784359a27100),
  1087. UINT64_C(0x19b9e91b09fcea8b), UINT64_C(0x636199d339c963f2),
  1088. UINT64_C(0xdf7adabd7a6e2d6f), UINT64_C(0xa5a2aa754a5ba416),
  1089. UINT64_C(0x2aca3b2d1a053f9d), UINT64_C(0x50124be52a30b6e4),
  1090. UINT64_C(0x1f423fcee22f9be0), UINT64_C(0x659a4f06d21a1299),
  1091. UINT64_C(0xeaf2de5e82448912), UINT64_C(0x902aae96b271006b),
  1092. UINT64_C(0x74523609127ad31a), UINT64_C(0x0e8a46c1224f5a63),
  1093. UINT64_C(0x81e2d7997211c1e8), UINT64_C(0xfb3aa75142244891),
  1094. UINT64_C(0xb46ad37a8a3b6595), UINT64_C(0xceb2a3b2ba0eecec),
  1095. UINT64_C(0x41da32eaea507767), UINT64_C(0x3b024222da65fe1e),
  1096. UINT64_C(0xa2722586f2d042ee), UINT64_C(0xd8aa554ec2e5cb97),
  1097. UINT64_C(0x57c2c41692bb501c), UINT64_C(0x2d1ab4dea28ed965),
  1098. UINT64_C(0x624ac0f56a91f461), UINT64_C(0x1892b03d5aa47d18),
  1099. UINT64_C(0x97fa21650afae693), UINT64_C(0xed2251ad3acf6fea),
  1100. UINT64_C(0x095ac9329ac4bc9b), UINT64_C(0x7382b9faaaf135e2),
  1101. UINT64_C(0xfcea28a2faafae69), UINT64_C(0x8632586aca9a2710),
  1102. UINT64_C(0xc9622c4102850a14), UINT64_C(0xb3ba5c8932b0836d),
  1103. UINT64_C(0x3cd2cdd162ee18e6), UINT64_C(0x460abd1952db919f),
  1104. UINT64_C(0x256b24ca6b12f26d), UINT64_C(0x5fb354025b277b14),
  1105. UINT64_C(0xd0dbc55a0b79e09f), UINT64_C(0xaa03b5923b4c69e6),
  1106. UINT64_C(0xe553c1b9f35344e2), UINT64_C(0x9f8bb171c366cd9b),
  1107. UINT64_C(0x10e3202993385610), UINT64_C(0x6a3b50e1a30ddf69),
  1108. UINT64_C(0x8e43c87e03060c18), UINT64_C(0xf49bb8b633338561),
  1109. UINT64_C(0x7bf329ee636d1eea), UINT64_C(0x012b592653589793),
  1110. UINT64_C(0x4e7b2d0d9b47ba97), UINT64_C(0x34a35dc5ab7233ee),
  1111. UINT64_C(0xbbcbcc9dfb2ca865), UINT64_C(0xc113bc55cb19211c),
  1112. UINT64_C(0x5863dbf1e3ac9dec), UINT64_C(0x22bbab39d3991495),
  1113. UINT64_C(0xadd33a6183c78f1e), UINT64_C(0xd70b4aa9b3f20667),
  1114. UINT64_C(0x985b3e827bed2b63), UINT64_C(0xe2834e4a4bd8a21a),
  1115. UINT64_C(0x6debdf121b863991), UINT64_C(0x1733afda2bb3b0e8),
  1116. UINT64_C(0xf34b37458bb86399), UINT64_C(0x8993478dbb8deae0),
  1117. UINT64_C(0x06fbd6d5ebd3716b), UINT64_C(0x7c23a61ddbe6f812),
  1118. UINT64_C(0x3373d23613f9d516), UINT64_C(0x49aba2fe23cc5c6f),
  1119. UINT64_C(0xc6c333a67392c7e4), UINT64_C(0xbc1b436e43a74e9d),
  1120. UINT64_C(0x95ac9329ac4bc9b5), UINT64_C(0xef74e3e19c7e40cc),
  1121. UINT64_C(0x601c72b9cc20db47), UINT64_C(0x1ac40271fc15523e),
  1122. UINT64_C(0x5594765a340a7f3a), UINT64_C(0x2f4c0692043ff643),
  1123. UINT64_C(0xa02497ca54616dc8), UINT64_C(0xdafce7026454e4b1),
  1124. UINT64_C(0x3e847f9dc45f37c0), UINT64_C(0x445c0f55f46abeb9),
  1125. UINT64_C(0xcb349e0da4342532), UINT64_C(0xb1eceec59401ac4b),
  1126. UINT64_C(0xfebc9aee5c1e814f), UINT64_C(0x8464ea266c2b0836),
  1127. UINT64_C(0x0b0c7b7e3c7593bd), UINT64_C(0x71d40bb60c401ac4),
  1128. UINT64_C(0xe8a46c1224f5a634), UINT64_C(0x927c1cda14c02f4d),
  1129. UINT64_C(0x1d148d82449eb4c6), UINT64_C(0x67ccfd4a74ab3dbf),
  1130. UINT64_C(0x289c8961bcb410bb), UINT64_C(0x5244f9a98c8199c2),
  1131. UINT64_C(0xdd2c68f1dcdf0249), UINT64_C(0xa7f41839ecea8b30),
  1132. UINT64_C(0x438c80a64ce15841), UINT64_C(0x3954f06e7cd4d138),
  1133. UINT64_C(0xb63c61362c8a4ab3), UINT64_C(0xcce411fe1cbfc3ca),
  1134. UINT64_C(0x83b465d5d4a0eece), UINT64_C(0xf96c151de49567b7),
  1135. UINT64_C(0x76048445b4cbfc3c), UINT64_C(0x0cdcf48d84fe7545),
  1136. UINT64_C(0x6fbd6d5ebd3716b7), UINT64_C(0x15651d968d029fce),
  1137. UINT64_C(0x9a0d8ccedd5c0445), UINT64_C(0xe0d5fc06ed698d3c),
  1138. UINT64_C(0xaf85882d2576a038), UINT64_C(0xd55df8e515432941),
  1139. UINT64_C(0x5a3569bd451db2ca), UINT64_C(0x20ed197575283bb3),
  1140. UINT64_C(0xc49581ead523e8c2), UINT64_C(0xbe4df122e51661bb),
  1141. UINT64_C(0x3125607ab548fa30), UINT64_C(0x4bfd10b2857d7349),
  1142. UINT64_C(0x04ad64994d625e4d), UINT64_C(0x7e7514517d57d734),
  1143. UINT64_C(0xf11d85092d094cbf), UINT64_C(0x8bc5f5c11d3cc5c6),
  1144. UINT64_C(0x12b5926535897936), UINT64_C(0x686de2ad05bcf04f),
  1145. UINT64_C(0xe70573f555e26bc4), UINT64_C(0x9ddd033d65d7e2bd),
  1146. UINT64_C(0xd28d7716adc8cfb9), UINT64_C(0xa85507de9dfd46c0),
  1147. UINT64_C(0x273d9686cda3dd4b), UINT64_C(0x5de5e64efd965432),
  1148. UINT64_C(0xb99d7ed15d9d8743), UINT64_C(0xc3450e196da80e3a),
  1149. UINT64_C(0x4c2d9f413df695b1), UINT64_C(0x36f5ef890dc31cc8),
  1150. UINT64_C(0x79a59ba2c5dc31cc), UINT64_C(0x037deb6af5e9b8b5),
  1151. UINT64_C(0x8c157a32a5b7233e), UINT64_C(0xf6cd0afa9582aa47),
  1152. UINT64_C(0x4ad64994d625e4da), UINT64_C(0x300e395ce6106da3),
  1153. UINT64_C(0xbf66a804b64ef628), UINT64_C(0xc5bed8cc867b7f51),
  1154. UINT64_C(0x8aeeace74e645255), UINT64_C(0xf036dc2f7e51db2c),
  1155. UINT64_C(0x7f5e4d772e0f40a7), UINT64_C(0x05863dbf1e3ac9de),
  1156. UINT64_C(0xe1fea520be311aaf), UINT64_C(0x9b26d5e88e0493d6),
  1157. UINT64_C(0x144e44b0de5a085d), UINT64_C(0x6e963478ee6f8124),
  1158. UINT64_C(0x21c640532670ac20), UINT64_C(0x5b1e309b16452559),
  1159. UINT64_C(0xd476a1c3461bbed2), UINT64_C(0xaeaed10b762e37ab),
  1160. UINT64_C(0x37deb6af5e9b8b5b), UINT64_C(0x4d06c6676eae0222),
  1161. UINT64_C(0xc26e573f3ef099a9), UINT64_C(0xb8b627f70ec510d0),
  1162. UINT64_C(0xf7e653dcc6da3dd4), UINT64_C(0x8d3e2314f6efb4ad),
  1163. UINT64_C(0x0256b24ca6b12f26), UINT64_C(0x788ec2849684a65f),
  1164. UINT64_C(0x9cf65a1b368f752e), UINT64_C(0xe62e2ad306bafc57),
  1165. UINT64_C(0x6946bb8b56e467dc), UINT64_C(0x139ecb4366d1eea5),
  1166. UINT64_C(0x5ccebf68aecec3a1), UINT64_C(0x2616cfa09efb4ad8),
  1167. UINT64_C(0xa97e5ef8cea5d153), UINT64_C(0xd3a62e30fe90582a),
  1168. UINT64_C(0xb0c7b7e3c7593bd8), UINT64_C(0xca1fc72bf76cb2a1),
  1169. UINT64_C(0x45775673a732292a), UINT64_C(0x3faf26bb9707a053),
  1170. UINT64_C(0x70ff52905f188d57), UINT64_C(0x0a2722586f2d042e),
  1171. UINT64_C(0x854fb3003f739fa5), UINT64_C(0xff97c3c80f4616dc),
  1172. UINT64_C(0x1bef5b57af4dc5ad), UINT64_C(0x61372b9f9f784cd4),
  1173. UINT64_C(0xee5fbac7cf26d75f), UINT64_C(0x9487ca0fff135e26),
  1174. UINT64_C(0xdbd7be24370c7322), UINT64_C(0xa10fceec0739fa5b),
  1175. UINT64_C(0x2e675fb4576761d0), UINT64_C(0x54bf2f7c6752e8a9),
  1176. UINT64_C(0xcdcf48d84fe75459), UINT64_C(0xb71738107fd2dd20),
  1177. UINT64_C(0x387fa9482f8c46ab), UINT64_C(0x42a7d9801fb9cfd2),
  1178. UINT64_C(0x0df7adabd7a6e2d6), UINT64_C(0x772fdd63e7936baf),
  1179. UINT64_C(0xf8474c3bb7cdf024), UINT64_C(0x829f3cf387f8795d),
  1180. UINT64_C(0x66e7a46c27f3aa2c), UINT64_C(0x1c3fd4a417c62355),
  1181. UINT64_C(0x935745fc4798b8de), UINT64_C(0xe98f353477ad31a7),
  1182. UINT64_C(0xa6df411fbfb21ca3), UINT64_C(0xdc0731d78f8795da),
  1183. UINT64_C(0x536fa08fdfd90e51), UINT64_C(0x29b7d047efec8728),
  1184. };
  1185. uint64_t enet_crc64(const ENetBuffer* buffers, int bufferCount) {
  1186. uint64_t crc = 0xFFFFFFFFFFFFFFFF;
  1187. while (bufferCount-- > 0) {
  1188. const uint8_t* data = (const uint8_t*)buffers->data;
  1189. const uint8_t* dataEnd = &data[buffers->dataLength];
  1190. while (data < dataEnd) {
  1191. crc = (crc >> 8) ^ crcTable[(uint8_t)crc ^ *data++];
  1192. }
  1193. ++buffers;
  1194. }
  1195. return ENET_HOST_TO_NET_64(~crc);
  1196. }
  1197. /*
  1198. =======================================================================
  1199. Packet
  1200. =======================================================================
  1201. */
  1202. ENetPacket* enet_packet_create(const void* data, size_t dataLength, uint32_t flags) {
  1203. ENetPacket* packet;
  1204. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1205. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1206. if (packet == NULL)
  1207. return NULL;
  1208. packet->data = (uint8_t*)data;
  1209. }
  1210. else {
  1211. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength);
  1212. if (packet == NULL)
  1213. return NULL;
  1214. packet->data = (uint8_t*)packet + sizeof(ENetPacket);
  1215. if (data != NULL)
  1216. memcpy(packet->data, data, dataLength);
  1217. }
  1218. packet->referenceCount = 0;
  1219. packet->flags = flags;
  1220. packet->dataLength = dataLength;
  1221. packet->freeCallback = NULL;
  1222. packet->userData = NULL;
  1223. return packet;
  1224. }
  1225. ENetPacket* enet_packet_create_offset(const void* data, size_t dataLength, size_t dataOffset, uint32_t flags) {
  1226. ENetPacket* packet;
  1227. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1228. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1229. if (packet == NULL)
  1230. return NULL;
  1231. packet->data = (uint8_t*)data;
  1232. }
  1233. else {
  1234. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength - dataOffset);
  1235. if (packet == NULL)
  1236. return NULL;
  1237. packet->data = (uint8_t*)packet + sizeof(ENetPacket);
  1238. if (data != NULL)
  1239. memcpy(packet->data, (char*)data + dataOffset, dataLength - dataOffset);
  1240. }
  1241. packet->referenceCount = 0;
  1242. packet->flags = flags;
  1243. packet->dataLength = dataLength - dataOffset;
  1244. packet->freeCallback = NULL;
  1245. packet->userData = NULL;
  1246. return packet;
  1247. }
  1248. void enet_packet_destroy(ENetPacket* packet) {
  1249. if (packet == NULL)
  1250. return;
  1251. if (packet->freeCallback != NULL)
  1252. (*packet->freeCallback)((void*)packet);
  1253. enet_free(packet);
  1254. }
  1255. /*
  1256. =======================================================================
  1257. Protocol
  1258. =======================================================================
  1259. */
  1260. static size_t commandSizes[ENET_PROTOCOL_COMMAND_COUNT] = {
  1261. 0,
  1262. sizeof(ENetProtocolAcknowledge),
  1263. sizeof(ENetProtocolConnect),
  1264. sizeof(ENetProtocolVerifyConnect),
  1265. sizeof(ENetProtocolDisconnect),
  1266. sizeof(ENetProtocolPing),
  1267. sizeof(ENetProtocolSendReliable),
  1268. sizeof(ENetProtocolSendUnreliable),
  1269. sizeof(ENetProtocolSendFragment),
  1270. sizeof(ENetProtocolSendUnsequenced),
  1271. sizeof(ENetProtocolBandwidthLimit),
  1272. sizeof(ENetProtocolThrottleConfigure),
  1273. sizeof(ENetProtocolSendFragment)
  1274. };
  1275. size_t enet_protocol_command_size(uint8_t commandNumber) {
  1276. return commandSizes[commandNumber & ENET_PROTOCOL_COMMAND_MASK];
  1277. }
  1278. static void enet_protocol_change_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1279. if (state == ENET_PEER_STATE_CONNECTED || state == ENET_PEER_STATE_DISCONNECT_LATER)
  1280. enet_peer_on_connect(peer);
  1281. else
  1282. enet_peer_on_disconnect(peer);
  1283. peer->state = state;
  1284. }
  1285. static void enet_protocol_dispatch_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1286. enet_protocol_change_state(host, peer, state);
  1287. if (!peer->needsDispatch) {
  1288. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1289. peer->needsDispatch = 1;
  1290. }
  1291. }
  1292. static int enet_protocol_dispatch_incoming_commands(ENetHost* host, ENetEvent* event) {
  1293. while (!enet_list_empty(&host->dispatchQueue)) {
  1294. ENetPeer* peer = (ENetPeer*)enet_list_remove(enet_list_begin(&host->dispatchQueue));
  1295. peer->needsDispatch = 0;
  1296. switch (peer->state) {
  1297. case ENET_PEER_STATE_CONNECTION_PENDING:
  1298. case ENET_PEER_STATE_CONNECTION_SUCCEEDED:
  1299. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1300. event->type = ENET_EVENT_TYPE_CONNECT;
  1301. event->peer = peer;
  1302. event->data = peer->eventData;
  1303. return 1;
  1304. case ENET_PEER_STATE_ZOMBIE:
  1305. host->recalculateBandwidthLimits = 1;
  1306. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1307. event->peer = peer;
  1308. event->data = peer->eventData;
  1309. enet_peer_reset(peer);
  1310. return 1;
  1311. case ENET_PEER_STATE_CONNECTED:
  1312. if (enet_list_empty(&peer->dispatchedCommands))
  1313. continue;
  1314. event->packet = enet_peer_receive(peer, &event->channelID);
  1315. if (event->packet == NULL)
  1316. continue;
  1317. event->type = ENET_EVENT_TYPE_RECEIVE;
  1318. event->peer = peer;
  1319. if (!enet_list_empty(&peer->dispatchedCommands)) {
  1320. peer->needsDispatch = 1;
  1321. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1322. }
  1323. return 1;
  1324. default:
  1325. break;
  1326. }
  1327. }
  1328. return 0;
  1329. }
  1330. static void enet_protocol_notify_connect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1331. host->recalculateBandwidthLimits = 1;
  1332. if (event != NULL) {
  1333. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1334. peer->totalDataSent = 0;
  1335. peer->totalDataReceived = 0;
  1336. peer->totalPacketsSent = 0;
  1337. peer->totalPacketsLost = 0;
  1338. event->type = ENET_EVENT_TYPE_CONNECT;
  1339. event->peer = peer;
  1340. event->data = peer->eventData;
  1341. }
  1342. else {
  1343. enet_protocol_dispatch_state(host, peer, peer->state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING);
  1344. }
  1345. }
  1346. static void enet_protocol_notify_disconnect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1347. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1348. host->recalculateBandwidthLimits = 1;
  1349. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1350. enet_peer_reset(peer);
  1351. }
  1352. else if (event != NULL) {
  1353. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1354. event->peer = peer;
  1355. event->data = 0;
  1356. enet_peer_reset(peer);
  1357. }
  1358. else {
  1359. peer->eventData = 0;
  1360. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1361. }
  1362. }
  1363. static void enet_protocol_notify_disconnect_timeout(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1364. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1365. host->recalculateBandwidthLimits = 1;
  1366. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1367. enet_peer_reset(peer);
  1368. }
  1369. else if (event != NULL) {
  1370. event->type = ENET_EVENT_TYPE_DISCONNECT_TIMEOUT;
  1371. event->peer = peer;
  1372. event->data = 0;
  1373. enet_peer_reset(peer);
  1374. }
  1375. else {
  1376. peer->eventData = 0;
  1377. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1378. }
  1379. }
  1380. static void enet_protocol_remove_sent_unreliable_commands(ENetPeer* peer) {
  1381. ENetOutgoingCommand* outgoingCommand;
  1382. if (enet_list_empty(&peer->sentUnreliableCommands))
  1383. return;
  1384. do {
  1385. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentUnreliableCommands);
  1386. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1387. if (outgoingCommand->packet != NULL) {
  1388. --outgoingCommand->packet->referenceCount;
  1389. if (outgoingCommand->packet->referenceCount == 0) {
  1390. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1391. enet_packet_destroy(outgoingCommand->packet);
  1392. }
  1393. }
  1394. enet_free(outgoingCommand);
  1395. }
  1396. while (!enet_list_empty(&peer->sentUnreliableCommands));
  1397. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingCommands) && enet_list_empty(&peer->sentReliableCommands))
  1398. enet_peer_disconnect(peer, peer->eventData);
  1399. }
  1400. static ENetProtocolCommand enet_protocol_remove_sent_reliable_command(ENetPeer* peer, uint16_t reliableSequenceNumber, uint8_t channelID) {
  1401. ENetOutgoingCommand* outgoingCommand = NULL;
  1402. ENetListIterator currentCommand;
  1403. ENetProtocolCommand commandNumber;
  1404. int wasSent = 1;
  1405. for (currentCommand = enet_list_begin(&peer->sentReliableCommands); currentCommand != enet_list_end(&peer->sentReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1406. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1407. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1408. break;
  1409. }
  1410. if (currentCommand == enet_list_end(&peer->sentReliableCommands)) {
  1411. for (currentCommand = enet_list_begin(&peer->outgoingCommands); currentCommand != enet_list_end(&peer->outgoingCommands); currentCommand = enet_list_next(currentCommand)) {
  1412. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1413. if (outgoingCommand->sendAttempts < 1)
  1414. return ENET_PROTOCOL_COMMAND_NONE;
  1415. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1416. break;
  1417. }
  1418. if (currentCommand == enet_list_end(&peer->outgoingCommands))
  1419. return ENET_PROTOCOL_COMMAND_NONE;
  1420. wasSent = 0;
  1421. }
  1422. if (outgoingCommand == NULL)
  1423. return ENET_PROTOCOL_COMMAND_NONE;
  1424. if (channelID < peer->channelCount) {
  1425. ENetChannel* channel = &peer->channels[channelID];
  1426. uint16_t reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1427. if (channel->reliableWindows[reliableWindow] > 0) {
  1428. --channel->reliableWindows[reliableWindow];
  1429. if (!channel->reliableWindows[reliableWindow])
  1430. channel->usedReliableWindows &= ~(1 << reliableWindow);
  1431. }
  1432. }
  1433. commandNumber = (ENetProtocolCommand)(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK);
  1434. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1435. if (outgoingCommand->packet != NULL) {
  1436. if (wasSent)
  1437. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  1438. --outgoingCommand->packet->referenceCount;
  1439. if (outgoingCommand->packet->referenceCount == 0) {
  1440. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1441. enet_packet_destroy(outgoingCommand->packet);
  1442. }
  1443. }
  1444. enet_free(outgoingCommand);
  1445. if (enet_list_empty(&peer->sentReliableCommands))
  1446. return commandNumber;
  1447. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentReliableCommands);
  1448. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  1449. return commandNumber;
  1450. }
  1451. static ENetPeer* enet_protocol_handle_connect(ENetHost* host, ENetProtocolHeader* header, ENetProtocol* command) {
  1452. uint8_t incomingSessionID, outgoingSessionID;
  1453. uint32_t mtu, windowSize;
  1454. ENetChannel* channel;
  1455. size_t channelCount, duplicatePeers = 0;
  1456. ENetPeer* currentPeer, * peer = NULL;
  1457. ENetProtocol verifyCommand;
  1458. channelCount = ENET_NET_TO_HOST_32(command->connect.channelCount);
  1459. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  1460. return NULL;
  1461. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  1462. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED) {
  1463. if (peer == NULL)
  1464. peer = currentPeer;
  1465. }
  1466. else if (currentPeer->state != ENET_PEER_STATE_CONNECTING && enet_in6_equal(currentPeer->address.ipv6, host->receivedAddress.ipv6)) {
  1467. if (currentPeer->address.port == host->receivedAddress.port && currentPeer->connectID == command->connect.connectID)
  1468. return NULL;
  1469. ++duplicatePeers;
  1470. }
  1471. }
  1472. if (peer == NULL || duplicatePeers >= host->duplicatePeers)
  1473. return NULL;
  1474. if (channelCount > host->channelLimit)
  1475. channelCount = host->channelLimit;
  1476. peer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  1477. if (peer->channels == NULL)
  1478. return NULL;
  1479. peer->channelCount = channelCount;
  1480. peer->state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
  1481. peer->connectID = command->connect.connectID;
  1482. peer->address = host->receivedAddress;
  1483. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->connect.outgoingPeerID);
  1484. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->connect.incomingBandwidth);
  1485. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->connect.outgoingBandwidth);
  1486. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->connect.packetThrottleInterval);
  1487. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleAcceleration);
  1488. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleDeceleration);
  1489. peer->eventData = ENET_NET_TO_HOST_32(command->connect.data);
  1490. incomingSessionID = command->connect.incomingSessionID == 0xFF ? peer->outgoingSessionID : command->connect.incomingSessionID;
  1491. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1492. if (incomingSessionID == peer->outgoingSessionID)
  1493. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1494. peer->outgoingSessionID = incomingSessionID;
  1495. outgoingSessionID = command->connect.outgoingSessionID == 0xFF ? peer->incomingSessionID : command->connect.outgoingSessionID;
  1496. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1497. if (outgoingSessionID == peer->incomingSessionID)
  1498. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1499. peer->incomingSessionID = outgoingSessionID;
  1500. for (channel = peer->channels; channel < &peer->channels[channelCount]; ++channel) {
  1501. channel->outgoingReliableSequenceNumber = 0;
  1502. channel->outgoingUnreliableSequenceNumber = 0;
  1503. channel->incomingReliableSequenceNumber = 0;
  1504. channel->incomingUnreliableSequenceNumber = 0;
  1505. enet_list_clear(&channel->incomingReliableCommands);
  1506. enet_list_clear(&channel->incomingUnreliableCommands);
  1507. channel->usedReliableWindows = 0;
  1508. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  1509. }
  1510. mtu = ENET_NET_TO_HOST_32(command->connect.mtu);
  1511. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1512. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1513. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1514. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1515. peer->mtu = mtu;
  1516. if (host->outgoingBandwidth == 0 && peer->incomingBandwidth == 0)
  1517. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1518. else if (host->outgoingBandwidth == 0 || peer->incomingBandwidth == 0)
  1519. peer->windowSize = (ENET_MAX(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1520. else
  1521. peer->windowSize = (ENET_MIN(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1522. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1523. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1524. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1525. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1526. if (host->incomingBandwidth == 0)
  1527. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1528. else
  1529. windowSize = (host->incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1530. if (windowSize > ENET_NET_TO_HOST_32(command->connect.windowSize))
  1531. windowSize = ENET_NET_TO_HOST_32(command->connect.windowSize);
  1532. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1533. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1534. else if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1535. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1536. verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  1537. verifyCommand.header.channelID = 0xFF;
  1538. verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16(peer->incomingPeerID);
  1539. verifyCommand.verifyConnect.incomingSessionID = incomingSessionID;
  1540. verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID;
  1541. verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_32(peer->mtu);
  1542. verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32(windowSize);
  1543. verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  1544. verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  1545. verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  1546. verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32(peer->packetThrottleInterval);
  1547. verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(peer->packetThrottleAcceleration);
  1548. verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(peer->packetThrottleDeceleration);
  1549. verifyCommand.verifyConnect.connectID = peer->connectID;
  1550. enet_peer_queue_outgoing_command(peer, &verifyCommand, NULL, 0, 0);
  1551. return peer;
  1552. }
  1553. static int enet_protocol_handle_send_reliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1554. size_t dataLength;
  1555. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1556. ENET_LOG_ERROR("Destination channel ID is greater than the configured peer channel count, or the peer is disconnected/later pending disconnection");
  1557. return -1;
  1558. }
  1559. dataLength = ENET_NET_TO_HOST_16(command->sendReliable.dataLength);
  1560. *currentData += dataLength;
  1561. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > & host->receivedData[host->receivedDataLength]) {
  1562. ENET_LOG_ERROR("Packet has a data length error.");
  1563. return -1;
  1564. }
  1565. if (enet_peer_queue_incoming_command(peer, command, (const uint8_t*)command + sizeof(ENetProtocolSendReliable), dataLength, ENET_PACKET_FLAG_RELIABLE, 0) == NULL) {
  1566. ENET_LOG_ERROR("NULL was returned trying to queue a Command from a Peer.");
  1567. return -1;
  1568. }
  1569. return 0;
  1570. }
  1571. static int enet_protocol_handle_send_unsequenced(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1572. uint32_t unsequencedGroup, index;
  1573. size_t dataLength;
  1574. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1575. ENET_LOG_ERROR("Destination channel ID is greater than the configured peer channel count, or the peer is disconnected/later pending disconnection");
  1576. return -1;
  1577. }
  1578. dataLength = ENET_NET_TO_HOST_16(command->sendUnsequenced.dataLength);
  1579. *currentData += dataLength;
  1580. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > & host->receivedData[host->receivedDataLength]) {
  1581. ENET_LOG_ERROR("Packet has a data length error.");
  1582. return -1;
  1583. }
  1584. unsequencedGroup = ENET_NET_TO_HOST_16(command->sendUnsequenced.unsequencedGroup);
  1585. index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
  1586. if (unsequencedGroup < peer->incomingUnsequencedGroup)
  1587. unsequencedGroup += 0x10000;
  1588. if (unsequencedGroup >= (uint32_t)peer->incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE)
  1589. return 0;
  1590. unsequencedGroup &= 0xFFFF;
  1591. if (unsequencedGroup - index != peer->incomingUnsequencedGroup) {
  1592. peer->incomingUnsequencedGroup = unsequencedGroup - index;
  1593. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  1594. }
  1595. else if (peer->unsequencedWindow[index / 32] & (1 << (index % 32))) {
  1596. return 0;
  1597. }
  1598. if (enet_peer_queue_incoming_command(peer, command, (const uint8_t*)command + sizeof(ENetProtocolSendUnsequenced), dataLength, ENET_PACKET_FLAG_UNSEQUENCED, 0) == NULL) {
  1599. ENET_LOG_ERROR("NULL was returned trying to queue a Command from a Peer.");
  1600. return -1;
  1601. }
  1602. peer->unsequencedWindow[index / 32] |= 1 << (index % 32);
  1603. return 0;
  1604. }
  1605. static int enet_protocol_handle_send_unreliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1606. size_t dataLength;
  1607. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1608. ENET_LOG_ERROR("Destination channel ID is greater than the configured peer channel count, or the peer is disconnected/later pending disconnection");
  1609. return -1;
  1610. }
  1611. dataLength = ENET_NET_TO_HOST_16(command->sendUnreliable.dataLength);
  1612. *currentData += dataLength;
  1613. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > & host->receivedData[host->receivedDataLength]) {
  1614. ENET_LOG_ERROR("Packet has a data length error.");
  1615. return -1;
  1616. }
  1617. if (enet_peer_queue_incoming_command(peer, command, (const uint8_t*)command + sizeof(ENetProtocolSendUnreliable), dataLength, 0, 0) == NULL) {
  1618. ENET_LOG_ERROR("NULL was returned trying to queue a Command from a Peer.");
  1619. return -1;
  1620. }
  1621. return 0;
  1622. }
  1623. static int enet_protocol_handle_send_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1624. uint32_t fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, startSequenceNumber, totalLength;
  1625. ENetChannel* channel;
  1626. uint16_t startWindow, currentWindow;
  1627. ENetListIterator currentCommand;
  1628. ENetIncomingCommand* startCommand = NULL;
  1629. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1630. ENET_LOG_ERROR("Destination channel ID is greater than the configured peer channel count, or the peer is disconnected/later pending disconnection");
  1631. return -1;
  1632. }
  1633. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1634. *currentData += fragmentLength;
  1635. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > & host->receivedData[host->receivedDataLength]) {
  1636. ENET_LOG_ERROR("Fragmented Packet has a data length error.");
  1637. return -1;
  1638. }
  1639. channel = &peer->channels[command->header.channelID];
  1640. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1641. startWindow = startSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1642. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1643. if (startSequenceNumber < channel->incomingReliableSequenceNumber)
  1644. startWindow += ENET_PEER_RELIABLE_WINDOWS;
  1645. if (startWindow < currentWindow || startWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1646. return 0;
  1647. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1648. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1649. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1650. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1651. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset) {
  1652. ENET_LOG_ERROR("Fragmented Packet has errors.");
  1653. return -1;
  1654. }
  1655. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1656. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1657. if (startSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1658. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1659. continue;
  1660. }
  1661. else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1662. break;
  1663. }
  1664. if (incomingCommand->reliableSequenceNumber <= startSequenceNumber) {
  1665. if (incomingCommand->reliableSequenceNumber < startSequenceNumber)
  1666. break;
  1667. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount) {
  1668. ENET_LOG_ERROR("Fragmented Packet has a header command error.");
  1669. return -1;
  1670. }
  1671. startCommand = incomingCommand;
  1672. break;
  1673. }
  1674. }
  1675. if (startCommand == NULL) {
  1676. ENetProtocol hostCommand = *command;
  1677. hostCommand.header.reliableSequenceNumber = startSequenceNumber;
  1678. startCommand = enet_peer_queue_incoming_command(peer, &hostCommand, NULL, totalLength, ENET_PACKET_FLAG_RELIABLE, fragmentCount);
  1679. if (startCommand == NULL) {
  1680. ENET_LOG_ERROR("Packet start command was NULL.");
  1681. return -1;
  1682. }
  1683. }
  1684. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1685. --startCommand->fragmentsRemaining;
  1686. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1687. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1688. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1689. memcpy(startCommand->packet->data + fragmentOffset, (uint8_t*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1690. if (startCommand->fragmentsRemaining <= 0)
  1691. enet_peer_dispatch_incoming_reliable_commands(peer, channel, NULL);
  1692. }
  1693. return 0;
  1694. }
  1695. static int enet_protocol_handle_send_unreliable_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1696. uint32_t fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, reliableSequenceNumber, startSequenceNumber, totalLength;
  1697. uint16_t reliableWindow, currentWindow;
  1698. ENetChannel* channel;
  1699. ENetListIterator currentCommand;
  1700. ENetIncomingCommand* startCommand = NULL;
  1701. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1702. ENET_LOG_ERROR("Destination channel ID is greater than the configured peer channel count, or the peer is disconnected/later pending disconnection");
  1703. return -1;
  1704. }
  1705. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1706. *currentData += fragmentLength;
  1707. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > & host->receivedData[host->receivedDataLength]) {
  1708. ENET_LOG_ERROR("Fragmented Packet has errors.");
  1709. return -1;
  1710. }
  1711. channel = &peer->channels[command->header.channelID];
  1712. reliableSequenceNumber = command->header.reliableSequenceNumber;
  1713. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1714. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1715. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1716. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1717. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  1718. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1719. return 0;
  1720. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && startSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  1721. return 0;
  1722. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1723. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1724. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1725. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1726. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset) {
  1727. ENET_LOG_ERROR("Packet has exceeded maximum number of fragments, the total length is more than the packet size, the offset is out of bounds or the fragment is too big");
  1728. return -1;
  1729. }
  1730. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1731. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1732. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1733. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1734. continue;
  1735. }
  1736. else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1737. break;
  1738. }
  1739. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  1740. break;
  1741. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  1742. continue;
  1743. if (incomingCommand->unreliableSequenceNumber <= startSequenceNumber) {
  1744. if (incomingCommand->unreliableSequenceNumber < startSequenceNumber)
  1745. break;
  1746. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount) {
  1747. ENET_LOG_ERROR("Fragmented Packet has a header command error.");
  1748. return -1;
  1749. }
  1750. startCommand = incomingCommand;
  1751. break;
  1752. }
  1753. }
  1754. if (startCommand == NULL) {
  1755. startCommand = enet_peer_queue_incoming_command(peer, command, NULL, totalLength, ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED, fragmentCount);
  1756. if (startCommand == NULL) {
  1757. ENET_LOG_ERROR("Packet start command was NULL.");
  1758. return -1;
  1759. }
  1760. }
  1761. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1762. --startCommand->fragmentsRemaining;
  1763. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1764. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1765. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1766. memcpy(startCommand->packet->data + fragmentOffset, (uint8_t*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1767. if (startCommand->fragmentsRemaining <= 0)
  1768. enet_peer_dispatch_incoming_unreliable_commands(peer, channel, NULL);
  1769. }
  1770. return 0;
  1771. }
  1772. static int enet_protocol_handle_ping(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1773. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1774. ENET_LOG_ERROR("Tried to handle a ping from a Peer neither in Connected or Disconnect Later state.");
  1775. return -1;
  1776. }
  1777. return 0;
  1778. }
  1779. static int enet_protocol_handle_bandwidth_limit(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1780. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1781. ENET_LOG_ERROR("Tried to handle bandwidth limiting a Peer that is neither in Connected or Disconnect Later state.");
  1782. return -1;
  1783. }
  1784. if (peer->incomingBandwidth != 0)
  1785. --host->bandwidthLimitedPeers;
  1786. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.incomingBandwidth);
  1787. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.outgoingBandwidth);
  1788. if (peer->incomingBandwidth != 0)
  1789. ++host->bandwidthLimitedPeers;
  1790. if (peer->incomingBandwidth == 0 && host->outgoingBandwidth == 0)
  1791. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1792. else if (peer->incomingBandwidth == 0 || host->outgoingBandwidth == 0)
  1793. peer->windowSize = (ENET_MAX(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1794. else
  1795. peer->windowSize = (ENET_MIN(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1796. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1797. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1798. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1799. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1800. return 0;
  1801. }
  1802. static int enet_protocol_handle_throttle_configure(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1803. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1804. ENET_LOG_ERROR("Peer is not Connected or in Disconnect Later state.");
  1805. return -1;
  1806. }
  1807. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleInterval);
  1808. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleAcceleration);
  1809. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleDeceleration);
  1810. return 0;
  1811. }
  1812. static int enet_protocol_handle_disconnect(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1813. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT)
  1814. return 0;
  1815. enet_peer_reset_queues(peer);
  1816. if (peer->state == ENET_PEER_STATE_CONNECTION_SUCCEEDED || peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_CONNECTING) {
  1817. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1818. }
  1819. else if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1820. if (peer->state == ENET_PEER_STATE_CONNECTION_PENDING)
  1821. host->recalculateBandwidthLimits = 1;
  1822. enet_peer_reset(peer);
  1823. }
  1824. else if (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  1825. enet_protocol_change_state(host, peer, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT);
  1826. }
  1827. else {
  1828. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1829. }
  1830. if (peer->state != ENET_PEER_STATE_DISCONNECTED)
  1831. peer->eventData = ENET_NET_TO_HOST_32(command->disconnect.data);
  1832. return 0;
  1833. }
  1834. static int enet_protocol_handle_acknowledge(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1835. uint32_t roundTripTime, receivedSentTime, receivedReliableSequenceNumber;
  1836. ENetProtocolCommand commandNumber;
  1837. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE)
  1838. return 0;
  1839. receivedSentTime = ENET_NET_TO_HOST_16(command->acknowledge.receivedSentTime);
  1840. receivedSentTime |= host->serviceTime & 0xFFFF0000;
  1841. if ((receivedSentTime & 0x8000) > (host->serviceTime & 0x8000))
  1842. receivedSentTime -= 0x10000;
  1843. if (ENET_TIME_LESS(host->serviceTime, receivedSentTime))
  1844. return 0;
  1845. roundTripTime = ENET_TIME_DIFFERENCE(host->serviceTime, receivedSentTime);
  1846. if (roundTripTime == 0)
  1847. roundTripTime = 1;
  1848. enet_peer_throttle(peer, roundTripTime);
  1849. if (peer->lastReceiveTime > 0) {
  1850. if (roundTripTime >= peer->roundTripTime) {
  1851. uint32_t diff = roundTripTime - peer->roundTripTime;
  1852. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1853. peer->roundTripTimeVariance += diff / 4;
  1854. peer->roundTripTime += diff / 8;
  1855. }
  1856. else {
  1857. uint32_t diff = peer->roundTripTime - roundTripTime;
  1858. if (diff <= peer->roundTripTimeVariance) {
  1859. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1860. peer->roundTripTimeVariance += diff / 4;
  1861. }
  1862. else {
  1863. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 32;
  1864. peer->roundTripTimeVariance += diff / 32;
  1865. }
  1866. peer->roundTripTime -= diff / 8;
  1867. }
  1868. }
  1869. else {
  1870. peer->roundTripTime = roundTripTime;
  1871. peer->roundTripTimeVariance = roundTripTime / 2;
  1872. }
  1873. if (peer->roundTripTime < peer->lowestRoundTripTime)
  1874. peer->lowestRoundTripTime = peer->roundTripTime;
  1875. if (peer->roundTripTimeVariance > peer->highestRoundTripTimeVariance)
  1876. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1877. if (peer->packetThrottleEpoch == 0 || ENET_TIME_DIFFERENCE(host->serviceTime, peer->packetThrottleEpoch) >= peer->packetThrottleInterval) {
  1878. peer->lastRoundTripTime = peer->lowestRoundTripTime;
  1879. peer->lastRoundTripTimeVariance = peer->highestRoundTripTimeVariance;
  1880. peer->lowestRoundTripTime = peer->roundTripTime;
  1881. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1882. peer->packetThrottleEpoch = host->serviceTime;
  1883. }
  1884. peer->lastReceiveTime = ENET_MAX(host->serviceTime, 1);
  1885. peer->earliestTimeout = 0;
  1886. receivedReliableSequenceNumber = ENET_NET_TO_HOST_16(command->acknowledge.receivedReliableSequenceNumber);
  1887. commandNumber = enet_protocol_remove_sent_reliable_command(peer, receivedReliableSequenceNumber, command->header.channelID);
  1888. switch (peer->state) {
  1889. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1890. if (commandNumber != ENET_PROTOCOL_COMMAND_VERIFY_CONNECT) {
  1891. ENET_LOG_ERROR("Wrong command number. Got %u vs %u.", commandNumber, ENET_PROTOCOL_COMMAND_VERIFY_CONNECT);
  1892. return -1;
  1893. }
  1894. enet_protocol_notify_connect(host, peer, event);
  1895. break;
  1896. case ENET_PEER_STATE_DISCONNECTING:
  1897. if (commandNumber != ENET_PROTOCOL_COMMAND_DISCONNECT) {
  1898. ENET_LOG_ERROR("Wrong command number. Got %u vs %u.", commandNumber, ENET_PROTOCOL_COMMAND_VERIFY_CONNECT);
  1899. return -1;
  1900. }
  1901. enet_protocol_notify_disconnect(host, peer, event);
  1902. break;
  1903. case ENET_PEER_STATE_DISCONNECT_LATER:
  1904. if (enet_list_empty(&peer->outgoingCommands) && enet_list_empty(&peer->sentReliableCommands))
  1905. enet_peer_disconnect(peer, peer->eventData);
  1906. break;
  1907. default:
  1908. break;
  1909. }
  1910. return 0;
  1911. }
  1912. static int enet_protocol_handle_verify_connect(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1913. uint32_t mtu, windowSize;
  1914. size_t channelCount;
  1915. if (peer->state != ENET_PEER_STATE_CONNECTING)
  1916. return 0;
  1917. channelCount = ENET_NET_TO_HOST_32(command->verifyConnect.channelCount);
  1918. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT || ENET_NET_TO_HOST_32(command->verifyConnect.packetThrottleInterval) != peer->packetThrottleInterval || ENET_NET_TO_HOST_32(command->verifyConnect.packetThrottleAcceleration) != peer->packetThrottleAcceleration || ENET_NET_TO_HOST_32(command->verifyConnect.packetThrottleDeceleration) != peer->packetThrottleDeceleration || command->verifyConnect.connectID != peer->connectID) {
  1919. peer->eventData = 0;
  1920. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1921. ENET_LOG_ERROR("Zombie peer detected!");
  1922. return -1;
  1923. }
  1924. enet_protocol_remove_sent_reliable_command(peer, 1, 0xFF);
  1925. if (channelCount < peer->channelCount)
  1926. peer->channelCount = channelCount;
  1927. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->verifyConnect.outgoingPeerID);
  1928. peer->incomingSessionID = command->verifyConnect.incomingSessionID;
  1929. peer->outgoingSessionID = command->verifyConnect.outgoingSessionID;
  1930. mtu = ENET_NET_TO_HOST_32(command->verifyConnect.mtu);
  1931. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1932. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1933. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1934. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1935. if (mtu < peer->mtu)
  1936. peer->mtu = mtu;
  1937. windowSize = ENET_NET_TO_HOST_32(command->verifyConnect.windowSize);
  1938. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1939. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1940. if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1941. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1942. if (windowSize < peer->windowSize)
  1943. peer->windowSize = windowSize;
  1944. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.incomingBandwidth);
  1945. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.outgoingBandwidth);
  1946. enet_protocol_notify_connect(host, peer, event);
  1947. return 0;
  1948. }
  1949. static int enet_protocol_handle_incoming_commands(ENetHost* host, ENetEvent* event) {
  1950. ENetProtocolHeader* header;
  1951. ENetProtocol* command;
  1952. ENetPeer* peer;
  1953. uint8_t* currentData;
  1954. size_t headerSize;
  1955. uint16_t peerID, flags;
  1956. uint8_t sessionID;
  1957. if (host->receivedDataLength < (size_t) & ((ENetProtocolHeader*)0)->sentTime)
  1958. return 0;
  1959. header = (ENetProtocolHeader*)host->receivedData;
  1960. peerID = ENET_NET_TO_HOST_16(header->peerID);
  1961. sessionID = (peerID & ENET_PROTOCOL_HEADER_SESSION_MASK) >> ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  1962. flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK;
  1963. peerID &= ~(ENET_PROTOCOL_HEADER_FLAG_MASK | ENET_PROTOCOL_HEADER_SESSION_MASK);
  1964. headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof(ENetProtocolHeader) : (size_t) & ((ENetProtocolHeader*)0)->sentTime);
  1965. if (host->checksumCallback != NULL)
  1966. headerSize += sizeof(enet_checksum);
  1967. if (peerID == ENET_PROTOCOL_MAXIMUM_PEER_ID) {
  1968. peer = NULL;
  1969. }
  1970. else if (peerID >= host->peerCount) {
  1971. return 0;
  1972. }
  1973. else {
  1974. peer = &host->peers[peerID];
  1975. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || ((!enet_in6_equal(host->receivedAddress.ipv6, peer->address.ipv6) || host->receivedAddress.port != peer->address.port) && peer->address.ipv4.ip.s_addr != INADDR_BROADCAST) || (peer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID && sessionID != peer->incomingSessionID))
  1976. return 0;
  1977. }
  1978. if (host->checksumCallback != NULL) {
  1979. enet_checksum* checksum = (enet_checksum*)&host->receivedData[headerSize - sizeof(enet_checksum)];
  1980. enet_checksum desiredChecksum = *checksum;
  1981. ENetBuffer buffer;
  1982. *checksum = peer != NULL ? peer->connectID : 0;
  1983. buffer.data = host->receivedData;
  1984. buffer.dataLength = host->receivedDataLength;
  1985. if (host->checksumCallback(&buffer, 1) != desiredChecksum)
  1986. return 0;
  1987. }
  1988. if (peer != NULL) {
  1989. peer->address.ipv6 = host->receivedAddress.ipv6;
  1990. peer->address.port = host->receivedAddress.port;
  1991. peer->incomingDataTotal += host->receivedDataLength;
  1992. peer->totalDataReceived += host->receivedDataLength;
  1993. }
  1994. currentData = host->receivedData + headerSize;
  1995. while (currentData < &host->receivedData[host->receivedDataLength]) {
  1996. uint8_t commandNumber;
  1997. size_t commandSize;
  1998. command = (ENetProtocol*)currentData;
  1999. if (currentData + sizeof(ENetProtocolCommandHeader) > & host->receivedData[host->receivedDataLength])
  2000. break;
  2001. commandNumber = command->header.command & ENET_PROTOCOL_COMMAND_MASK;
  2002. if (commandNumber >= ENET_PROTOCOL_COMMAND_COUNT)
  2003. break;
  2004. commandSize = commandSizes[commandNumber];
  2005. if (commandSize == 0 || currentData + commandSize > & host->receivedData[host->receivedDataLength])
  2006. break;
  2007. currentData += commandSize;
  2008. if (peer == NULL && (commandNumber != ENET_PROTOCOL_COMMAND_CONNECT || currentData < &host->receivedData[host->receivedDataLength]))
  2009. break;
  2010. command->header.reliableSequenceNumber = ENET_NET_TO_HOST_16(command->header.reliableSequenceNumber);
  2011. switch (commandNumber) {
  2012. case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE:
  2013. if (enet_protocol_handle_acknowledge(host, event, peer, command))
  2014. goto commandError;
  2015. break;
  2016. case ENET_PROTOCOL_COMMAND_CONNECT:
  2017. if (peer != NULL)
  2018. goto commandError;
  2019. if (host->preventConnections == 0) {
  2020. peer = enet_protocol_handle_connect(host, header, command);
  2021. if (peer == NULL)
  2022. goto commandError;
  2023. }
  2024. break;
  2025. case ENET_PROTOCOL_COMMAND_VERIFY_CONNECT:
  2026. if (enet_protocol_handle_verify_connect(host, event, peer, command))
  2027. goto commandError;
  2028. break;
  2029. case ENET_PROTOCOL_COMMAND_DISCONNECT:
  2030. if (enet_protocol_handle_disconnect(host, peer, command))
  2031. goto commandError;
  2032. break;
  2033. case ENET_PROTOCOL_COMMAND_PING:
  2034. if (enet_protocol_handle_ping(host, peer, command))
  2035. goto commandError;
  2036. break;
  2037. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2038. if (enet_protocol_handle_send_reliable(host, peer, command, &currentData))
  2039. goto commandError;
  2040. break;
  2041. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2042. if (enet_protocol_handle_send_unreliable(host, peer, command, &currentData))
  2043. goto commandError;
  2044. break;
  2045. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2046. if (enet_protocol_handle_send_unsequenced(host, peer, command, &currentData))
  2047. goto commandError;
  2048. break;
  2049. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2050. if (enet_protocol_handle_send_fragment(host, peer, command, &currentData))
  2051. goto commandError;
  2052. break;
  2053. case ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT:
  2054. if (enet_protocol_handle_bandwidth_limit(host, peer, command))
  2055. goto commandError;
  2056. break;
  2057. case ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE:
  2058. if (enet_protocol_handle_throttle_configure(host, peer, command))
  2059. goto commandError;
  2060. break;
  2061. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  2062. if (enet_protocol_handle_send_unreliable_fragment(host, peer, command, &currentData))
  2063. goto commandError;
  2064. break;
  2065. default:
  2066. goto commandError;
  2067. }
  2068. if (peer != NULL && (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0) {
  2069. uint16_t sentTime;
  2070. if (!(flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME))
  2071. break;
  2072. sentTime = ENET_NET_TO_HOST_16(header->sentTime);
  2073. switch (peer->state) {
  2074. case ENET_PEER_STATE_DISCONNECTING:
  2075. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  2076. case ENET_PEER_STATE_DISCONNECTED:
  2077. case ENET_PEER_STATE_ZOMBIE:
  2078. break;
  2079. case ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT:
  2080. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2081. enet_peer_queue_acknowledgement(peer, command, sentTime);
  2082. break;
  2083. default:
  2084. enet_peer_queue_acknowledgement(peer, command, sentTime);
  2085. break;
  2086. }
  2087. }
  2088. }
  2089. commandError:
  2090. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2091. return 1;
  2092. return 0;
  2093. }
  2094. static int enet_protocol_receive_incoming_commands(ENetHost* host, ENetEvent* event) {
  2095. int packets;
  2096. for (packets = 0; packets < 256; ++packets) {
  2097. int receivedLength;
  2098. ENetBuffer buffer;
  2099. buffer.data = host->packetData[0];
  2100. buffer.dataLength = host->mtu;
  2101. receivedLength = enet_socket_receive(host->socket, &host->receivedAddress, &buffer, 1);
  2102. if (receivedLength == -2)
  2103. continue;
  2104. if (receivedLength < 0) {
  2105. ENET_LOG_ERROR("Command received length was negative: %i", receivedLength);
  2106. return -1;
  2107. }
  2108. if (receivedLength == 0)
  2109. return 0;
  2110. host->receivedData = host->packetData[0];
  2111. host->receivedDataLength = receivedLength;
  2112. host->totalReceivedData += receivedLength;
  2113. host->totalReceivedPackets++;
  2114. if (host->interceptCallback != NULL) {
  2115. switch (host->interceptCallback(event, &host->receivedAddress, host->receivedData, host->receivedDataLength)) {
  2116. case 1:
  2117. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2118. return 1;
  2119. continue;
  2120. case -1:
  2121. ENET_LOG_ERROR("Intercept callback failure.");
  2122. return -1;
  2123. default:
  2124. break;
  2125. }
  2126. }
  2127. switch (enet_protocol_handle_incoming_commands(host, event)) {
  2128. case 1:
  2129. return 1;
  2130. case -1:
  2131. ENET_LOG_ERROR("Failed handling incoming protocol commands.");
  2132. return -1;
  2133. default:
  2134. break;
  2135. }
  2136. }
  2137. return 0;
  2138. }
  2139. static void enet_protocol_send_acknowledgements(ENetHost* host, ENetPeer* peer) {
  2140. ENetProtocol* command = &host->commands[host->commandCount];
  2141. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2142. ENetAcknowledgement* acknowledgement;
  2143. ENetListIterator currentAcknowledgement;
  2144. uint16_t reliableSequenceNumber;
  2145. currentAcknowledgement = enet_list_begin(&peer->acknowledgements);
  2146. while (currentAcknowledgement != enet_list_end(&peer->acknowledgements)) {
  2147. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < sizeof(ENetProtocolAcknowledge)) {
  2148. host->continueSending = 1;
  2149. break;
  2150. }
  2151. acknowledgement = (ENetAcknowledgement*)currentAcknowledgement;
  2152. currentAcknowledgement = enet_list_next(currentAcknowledgement);
  2153. buffer->data = command;
  2154. buffer->dataLength = sizeof(ENetProtocolAcknowledge);
  2155. host->packetSize += buffer->dataLength;
  2156. reliableSequenceNumber = ENET_HOST_TO_NET_16(acknowledgement->command.header.reliableSequenceNumber);
  2157. command->header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
  2158. command->header.channelID = acknowledgement->command.header.channelID;
  2159. command->header.reliableSequenceNumber = reliableSequenceNumber;
  2160. command->acknowledge.receivedReliableSequenceNumber = reliableSequenceNumber;
  2161. command->acknowledge.receivedSentTime = ENET_HOST_TO_NET_16(acknowledgement->sentTime);
  2162. if ((acknowledgement->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2163. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  2164. enet_list_remove(&acknowledgement->acknowledgementList);
  2165. enet_free(acknowledgement);
  2166. ++command;
  2167. ++buffer;
  2168. }
  2169. host->commandCount = command - host->commands;
  2170. host->bufferCount = buffer - host->buffers;
  2171. }
  2172. static int enet_protocol_check_timeouts(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  2173. ENetOutgoingCommand* outgoingCommand;
  2174. ENetListIterator currentCommand, insertPosition;
  2175. currentCommand = enet_list_begin(&peer->sentReliableCommands);
  2176. insertPosition = enet_list_begin(&peer->outgoingCommands);
  2177. while (currentCommand != enet_list_end(&peer->sentReliableCommands)) {
  2178. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2179. currentCommand = enet_list_next(currentCommand);
  2180. if (ENET_TIME_DIFFERENCE(host->serviceTime, outgoingCommand->sentTime) < outgoingCommand->roundTripTimeout)
  2181. continue;
  2182. if (peer->earliestTimeout == 0 || ENET_TIME_LESS(outgoingCommand->sentTime, peer->earliestTimeout))
  2183. peer->earliestTimeout = outgoingCommand->sentTime;
  2184. if (peer->earliestTimeout != 0 && (ENET_TIME_DIFFERENCE(host->serviceTime, peer->earliestTimeout) >= peer->timeoutMaximum || (outgoingCommand->roundTripTimeout >= outgoingCommand->roundTripTimeoutLimit && ENET_TIME_DIFFERENCE(host->serviceTime, peer->earliestTimeout) >= peer->timeoutMinimum))) {
  2185. enet_protocol_notify_disconnect_timeout(host, peer, event);
  2186. return 1;
  2187. }
  2188. if (outgoingCommand->packet != NULL)
  2189. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  2190. ++peer->totalPacketsLost;
  2191. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2192. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2193. enet_list_insert(insertPosition, enet_list_remove(&outgoingCommand->outgoingCommandList));
  2194. if (currentCommand == enet_list_begin(&peer->sentReliableCommands) && !enet_list_empty(&peer->sentReliableCommands)) {
  2195. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2196. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  2197. }
  2198. }
  2199. return 0;
  2200. }
  2201. static int enet_protocol_check_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2202. ENetProtocol* command = &host->commands[host->commandCount];
  2203. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2204. ENetOutgoingCommand* outgoingCommand;
  2205. ENetListIterator currentCommand;
  2206. ENetChannel* channel = NULL;
  2207. uint16_t reliableWindow = 0;
  2208. size_t commandSize = 0;
  2209. int windowExceeded = 0, windowWrap = 0, canPing = 1;
  2210. currentCommand = enet_list_begin(&peer->outgoingCommands);
  2211. while (currentCommand != enet_list_end(&peer->outgoingCommands)) {
  2212. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2213. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2214. channel = outgoingCommand->command.header.channelID < peer->channelCount ? &peer->channels[outgoingCommand->command.header.channelID] : NULL;
  2215. reliableWindow = outgoingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2216. if (channel != NULL) {
  2217. if (!windowWrap && outgoingCommand->sendAttempts < 1 && !(outgoingCommand->reliableSequenceNumber % ENET_PEER_RELIABLE_WINDOW_SIZE) && (channel->reliableWindows[(reliableWindow + ENET_PEER_RELIABLE_WINDOWS - 1) % ENET_PEER_RELIABLE_WINDOWS] >= ENET_PEER_RELIABLE_WINDOW_SIZE || channel->usedReliableWindows & ((((1 << (ENET_PEER_FREE_RELIABLE_WINDOWS + 2)) - 1) << reliableWindow) | (((1 << (ENET_PEER_FREE_RELIABLE_WINDOWS + 2)) - 1) >> (ENET_PEER_RELIABLE_WINDOWS - reliableWindow)))))
  2218. windowWrap = 1;
  2219. if (windowWrap) {
  2220. currentCommand = enet_list_next(currentCommand);
  2221. continue;
  2222. }
  2223. }
  2224. if (outgoingCommand->packet != NULL) {
  2225. if (!windowExceeded) {
  2226. uint32_t windowSize = (peer->packetThrottle * peer->windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE;
  2227. if (peer->reliableDataInTransit + outgoingCommand->fragmentLength > ENET_MAX(windowSize, peer->mtu))
  2228. windowExceeded = 1;
  2229. }
  2230. if (windowExceeded) {
  2231. currentCommand = enet_list_next(currentCommand);
  2232. continue;
  2233. }
  2234. }
  2235. canPing = 0;
  2236. }
  2237. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2238. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer + 1 >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < commandSize || (outgoingCommand->packet != NULL && (uint16_t)(peer->mtu - host->packetSize) < (uint16_t)(commandSize + outgoingCommand->fragmentLength))) {
  2239. host->continueSending = 1;
  2240. break;
  2241. }
  2242. currentCommand = enet_list_next(currentCommand);
  2243. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2244. if (channel != NULL && outgoingCommand->sendAttempts < 1) {
  2245. channel->usedReliableWindows |= 1 << reliableWindow;
  2246. ++channel->reliableWindows[reliableWindow];
  2247. }
  2248. ++outgoingCommand->sendAttempts;
  2249. if (outgoingCommand->roundTripTimeout == 0) {
  2250. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2251. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2252. }
  2253. if (enet_list_empty(&peer->sentReliableCommands))
  2254. peer->nextTimeout = host->serviceTime + outgoingCommand->roundTripTimeout;
  2255. enet_list_insert(enet_list_end(&peer->sentReliableCommands),
  2256. enet_list_remove(&outgoingCommand->outgoingCommandList));
  2257. outgoingCommand->sentTime = host->serviceTime;
  2258. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_SENT_TIME;
  2259. peer->reliableDataInTransit += outgoingCommand->fragmentLength;
  2260. }
  2261. else {
  2262. if (outgoingCommand->packet != NULL && outgoingCommand->fragmentOffset == 0 && !(outgoingCommand->packet->flags & (ENET_PACKET_FLAG_UNTHROTTLED))) {
  2263. peer->packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER;
  2264. peer->packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE;
  2265. if (peer->packetThrottleCounter > peer->packetThrottle) {
  2266. uint16_t reliableSequenceNumber = outgoingCommand->reliableSequenceNumber,
  2267. unreliableSequenceNumber = outgoingCommand->unreliableSequenceNumber;
  2268. for (;;) {
  2269. --outgoingCommand->packet->referenceCount;
  2270. if (outgoingCommand->packet->referenceCount == 0)
  2271. enet_packet_destroy(outgoingCommand->packet);
  2272. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2273. enet_free(outgoingCommand);
  2274. if (currentCommand == enet_list_end(&peer->outgoingCommands))
  2275. break;
  2276. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2277. if (outgoingCommand->reliableSequenceNumber != reliableSequenceNumber || outgoingCommand->unreliableSequenceNumber != unreliableSequenceNumber)
  2278. break;
  2279. currentCommand = enet_list_next(currentCommand);
  2280. }
  2281. continue;
  2282. }
  2283. }
  2284. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2285. if (outgoingCommand->packet != NULL)
  2286. enet_list_insert(enet_list_end(&peer->sentUnreliableCommands), outgoingCommand);
  2287. }
  2288. buffer->data = command;
  2289. buffer->dataLength = commandSize;
  2290. host->packetSize += buffer->dataLength;
  2291. *command = outgoingCommand->command;
  2292. if (outgoingCommand->packet != NULL) {
  2293. ++buffer;
  2294. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2295. buffer->dataLength = outgoingCommand->fragmentLength;
  2296. host->packetSize += outgoingCommand->fragmentLength;
  2297. }
  2298. else if (!(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)) {
  2299. enet_free(outgoingCommand);
  2300. }
  2301. ++peer->totalPacketsSent;
  2302. ++command;
  2303. ++buffer;
  2304. }
  2305. host->commandCount = command - host->commands;
  2306. host->bufferCount = buffer - host->buffers;
  2307. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingCommands) && enet_list_empty(&peer->sentReliableCommands) && enet_list_empty(&peer->sentUnreliableCommands))
  2308. enet_peer_disconnect(peer, peer->eventData);
  2309. return canPing;
  2310. }
  2311. static int enet_protocol_send_outgoing_commands(ENetHost* host, ENetEvent* event, int checkForTimeouts) {
  2312. uint8_t headerData[sizeof(ENetProtocolHeader) + sizeof(enet_checksum)];
  2313. ENetProtocolHeader* header = (ENetProtocolHeader*)headerData;
  2314. ENetPeer* currentPeer;
  2315. int sentLength;
  2316. host->continueSending = 1;
  2317. while (host->continueSending) {
  2318. for (host->continueSending = 0, currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2319. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED || currentPeer->state == ENET_PEER_STATE_ZOMBIE)
  2320. continue;
  2321. host->headerFlags = 0;
  2322. host->commandCount = 0;
  2323. host->bufferCount = 1;
  2324. host->packetSize = sizeof(ENetProtocolHeader);
  2325. if (host->checksumCallback != NULL)
  2326. host->packetSize += sizeof(enet_checksum);
  2327. if (!enet_list_empty(&currentPeer->acknowledgements))
  2328. enet_protocol_send_acknowledgements(host, currentPeer);
  2329. if (checkForTimeouts != 0 && !enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_GREATER_EQUAL(host->serviceTime, currentPeer->nextTimeout) && enet_protocol_check_timeouts(host, currentPeer, event) == 1) {
  2330. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2331. return 1;
  2332. else
  2333. continue;
  2334. }
  2335. if ((enet_list_empty(&currentPeer->outgoingCommands) || enet_protocol_check_outgoing_commands(host, currentPeer)) && enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->lastReceiveTime) >= currentPeer->pingInterval && currentPeer->mtu - host->packetSize >= sizeof(ENetProtocolPing)) {
  2336. enet_peer_ping(currentPeer);
  2337. enet_protocol_check_outgoing_commands(host, currentPeer);
  2338. }
  2339. if (host->commandCount == 0)
  2340. continue;
  2341. host->buffers->data = headerData;
  2342. if (host->headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME) {
  2343. header->sentTime = ENET_HOST_TO_NET_16(host->serviceTime & 0xFFFF);
  2344. host->buffers->dataLength = sizeof(ENetProtocolHeader);
  2345. }
  2346. else {
  2347. host->buffers->dataLength = (size_t) & ((ENetProtocolHeader*)0)->sentTime;
  2348. }
  2349. if (currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2350. host->headerFlags |= currentPeer->outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  2351. header->peerID = ENET_HOST_TO_NET_16(currentPeer->outgoingPeerID | host->headerFlags);
  2352. if (host->checksumCallback != NULL) {
  2353. enet_checksum* checksum = (enet_checksum*)&headerData[host->buffers->dataLength];
  2354. *checksum = currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer->connectID : 0;
  2355. host->buffers->dataLength += sizeof(enet_checksum);
  2356. *checksum = host->checksumCallback(host->buffers, host->bufferCount);
  2357. }
  2358. currentPeer->lastSendTime = host->serviceTime;
  2359. sentLength = enet_socket_send(host->socket, &currentPeer->address, host->buffers, host->bufferCount);
  2360. enet_protocol_remove_sent_unreliable_commands(currentPeer);
  2361. if (sentLength < 0)
  2362. return -1;
  2363. host->totalSentData += sentLength;
  2364. currentPeer->totalDataSent += sentLength;
  2365. host->totalSentPackets++;
  2366. }
  2367. }
  2368. return 0;
  2369. }
  2370. void enet_host_flush(ENetHost* host) {
  2371. host->serviceTime = enet_time_get();
  2372. enet_protocol_send_outgoing_commands(host, NULL, 0);
  2373. }
  2374. int enet_host_check_events(ENetHost* host, ENetEvent* event) {
  2375. if (event == NULL)
  2376. return -1;
  2377. event->type = ENET_EVENT_TYPE_NONE;
  2378. event->peer = NULL;
  2379. event->packet = NULL;
  2380. return enet_protocol_dispatch_incoming_commands(host, event);
  2381. }
  2382. int enet_host_service(ENetHost* host, ENetEvent* event, uint32_t timeout) {
  2383. uint32_t waitCondition;
  2384. if (event != NULL) {
  2385. event->type = ENET_EVENT_TYPE_NONE;
  2386. event->peer = NULL;
  2387. event->packet = NULL;
  2388. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2389. case 1:
  2390. return 1;
  2391. case -1:
  2392. ENET_LOG_ERROR("An error occurred while dispatching incoming packets.");
  2393. return -1;
  2394. default:
  2395. break;
  2396. }
  2397. }
  2398. host->serviceTime = enet_time_get();
  2399. timeout += host->serviceTime;
  2400. do {
  2401. if (ENET_TIME_DIFFERENCE(host->serviceTime, host->bandwidthThrottleEpoch) >= ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  2402. enet_host_bandwidth_throttle(host);
  2403. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2404. case 1:
  2405. return 1;
  2406. case -1:
  2407. ENET_LOG_ERROR("An error occurred while sending outgoing packet commands.");
  2408. return -1;
  2409. default:
  2410. break;
  2411. }
  2412. switch (enet_protocol_receive_incoming_commands(host, event)) {
  2413. case 1:
  2414. return 1;
  2415. case -1:
  2416. ENET_LOG_ERROR("An error occurred while dispatching incoming packet commands.");
  2417. return -1;
  2418. default:
  2419. break;
  2420. }
  2421. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2422. case 1:
  2423. return 1;
  2424. case -1:
  2425. ENET_LOG_ERROR("An error occurred while dispatching outgoing packet commands.");
  2426. return -1;
  2427. default:
  2428. break;
  2429. }
  2430. if (event != NULL) {
  2431. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2432. case 1:
  2433. return 1;
  2434. case -1:
  2435. ENET_LOG_ERROR("An error occurred while dispatching incoming packet commands.");
  2436. return -1;
  2437. default:
  2438. break;
  2439. }
  2440. }
  2441. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2442. return 0;
  2443. do {
  2444. host->serviceTime = enet_time_get();
  2445. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2446. return 0;
  2447. waitCondition = ENET_SOCKET_WAIT_RECEIVE | ENET_SOCKET_WAIT_INTERRUPT;
  2448. if (enet_socket_wait(host->socket, &waitCondition, ENET_TIME_DIFFERENCE(timeout, host->serviceTime)) != 0)
  2449. return -1;
  2450. }
  2451. while (waitCondition & ENET_SOCKET_WAIT_INTERRUPT);
  2452. host->serviceTime = enet_time_get();
  2453. }
  2454. while (waitCondition & ENET_SOCKET_WAIT_RECEIVE);
  2455. return 0;
  2456. }
  2457. /*
  2458. =======================================================================
  2459. Peer
  2460. =======================================================================
  2461. */
  2462. void enet_peer_throttle_configure(ENetPeer* peer, uint32_t interval, uint32_t acceleration, uint32_t deceleration, uint32_t threshold) {
  2463. ENetProtocol command;
  2464. peer->packetThrottleThreshold = threshold;
  2465. peer->packetThrottleInterval = interval;
  2466. peer->packetThrottleAcceleration = acceleration;
  2467. peer->packetThrottleDeceleration = deceleration;
  2468. command.header.command = ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2469. command.header.channelID = 0xFF;
  2470. command.throttleConfigure.packetThrottleInterval = ENET_HOST_TO_NET_32(interval);
  2471. command.throttleConfigure.packetThrottleAcceleration = ENET_HOST_TO_NET_32(acceleration);
  2472. command.throttleConfigure.packetThrottleDeceleration = ENET_HOST_TO_NET_32(deceleration);
  2473. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2474. }
  2475. int enet_peer_throttle(ENetPeer* peer, uint32_t rtt) {
  2476. if (peer->lastRoundTripTime <= peer->lastRoundTripTimeVariance) {
  2477. peer->packetThrottle = peer->packetThrottleLimit;
  2478. }
  2479. else if (rtt < peer->lastRoundTripTime + (peer->lastRoundTripTimeVariance + 1) / 2) {
  2480. peer->packetThrottle += peer->packetThrottleAcceleration;
  2481. if (peer->packetThrottle > peer->packetThrottleLimit)
  2482. peer->packetThrottle = peer->packetThrottleLimit;
  2483. return 1;
  2484. }
  2485. else if (rtt > peer->lastRoundTripTime + peer->packetThrottleThreshold + 2 * peer->lastRoundTripTimeVariance) {
  2486. if (peer->packetThrottle > peer->packetThrottleDeceleration)
  2487. peer->packetThrottle -= peer->packetThrottleDeceleration;
  2488. else
  2489. peer->packetThrottle = 0;
  2490. return -1;
  2491. }
  2492. return 0;
  2493. }
  2494. int enet_peer_send(ENetPeer* peer, uint8_t channelID, ENetPacket* packet) {
  2495. ENetChannel* channel;
  2496. ENetProtocol command;
  2497. size_t fragmentLength;
  2498. if (peer->state != ENET_PEER_STATE_CONNECTED || channelID >= peer->channelCount || packet->dataLength > peer->host->maximumPacketSize) {
  2499. ENET_LOG_ERROR("Failed sending data. Peer is not connected, the channel is above the maximum channels supported or the payload length is too large.");
  2500. return -1;
  2501. }
  2502. channel = &peer->channels[channelID];
  2503. fragmentLength = peer->mtu - sizeof(ENetProtocolHeader) - sizeof(ENetProtocolSendFragment) - sizeof(ENetProtocolAcknowledge);
  2504. if (peer->host->checksumCallback != NULL)
  2505. fragmentLength -= sizeof(enet_checksum);
  2506. if (packet->dataLength > fragmentLength) {
  2507. uint32_t fragmentCount = (packet->dataLength + fragmentLength - 1) / fragmentLength, fragmentNumber, fragmentOffset;
  2508. uint8_t commandNumber;
  2509. uint16_t startSequenceNumber;
  2510. ENetList fragments;
  2511. ENetOutgoingCommand* fragment;
  2512. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT) {
  2513. ENET_LOG_ERROR("Failed sending data. Too many fragments (%u vs %u).", fragmentCount, ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT);
  2514. return -1;
  2515. }
  2516. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED)) == ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED && channel->outgoingUnreliableSequenceNumber < 0xFFFF) {
  2517. commandNumber = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT;
  2518. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingUnreliableSequenceNumber + 1);
  2519. }
  2520. else {
  2521. commandNumber = ENET_PROTOCOL_COMMAND_SEND_FRAGMENT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2522. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingReliableSequenceNumber + 1);
  2523. }
  2524. enet_list_clear(&fragments);
  2525. for (fragmentNumber = 0, fragmentOffset = 0; fragmentOffset < packet->dataLength; ++fragmentNumber, fragmentOffset += fragmentLength) {
  2526. if (packet->dataLength - fragmentOffset < fragmentLength)
  2527. fragmentLength = packet->dataLength - fragmentOffset;
  2528. fragment = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2529. if (fragment == NULL) {
  2530. while (!enet_list_empty(&fragments)) {
  2531. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2532. enet_free(fragment);
  2533. }
  2534. ENET_LOG_ERROR("Failed sending data. A fragment was null.");
  2535. return -1;
  2536. }
  2537. fragment->fragmentOffset = fragmentOffset;
  2538. fragment->fragmentLength = fragmentLength;
  2539. fragment->packet = packet;
  2540. fragment->command.header.command = commandNumber;
  2541. fragment->command.header.channelID = channelID;
  2542. fragment->command.sendFragment.startSequenceNumber = startSequenceNumber;
  2543. fragment->command.sendFragment.dataLength = ENET_HOST_TO_NET_16(fragmentLength);
  2544. fragment->command.sendFragment.fragmentCount = ENET_HOST_TO_NET_32(fragmentCount);
  2545. fragment->command.sendFragment.fragmentNumber = ENET_HOST_TO_NET_32(fragmentNumber);
  2546. fragment->command.sendFragment.totalLength = ENET_HOST_TO_NET_32(packet->dataLength);
  2547. fragment->command.sendFragment.fragmentOffset = ENET_NET_TO_HOST_32(fragmentOffset);
  2548. enet_list_insert(enet_list_end(&fragments), fragment);
  2549. }
  2550. packet->referenceCount += fragmentNumber;
  2551. while (!enet_list_empty(&fragments)) {
  2552. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2553. enet_peer_setup_outgoing_command(peer, fragment);
  2554. }
  2555. return 0;
  2556. }
  2557. command.header.channelID = channelID;
  2558. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNSEQUENCED)) == ENET_PACKET_FLAG_UNSEQUENCED) {
  2559. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2560. command.sendUnsequenced.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2561. }
  2562. else if (packet->flags & ENET_PACKET_FLAG_RELIABLE || channel->outgoingUnreliableSequenceNumber >= 0xFFFF) {
  2563. command.header.command = ENET_PROTOCOL_COMMAND_SEND_RELIABLE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2564. command.sendReliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2565. }
  2566. else {
  2567. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE;
  2568. command.sendUnreliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2569. }
  2570. if (enet_peer_queue_outgoing_command(peer, &command, packet, 0, packet->dataLength) == NULL) {
  2571. ENET_LOG_ERROR("Unable to queue a NULL outgoing command.");
  2572. return -1;
  2573. }
  2574. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  2575. enet_host_flush(peer->host);
  2576. return 0;
  2577. }
  2578. ENetPacket* enet_peer_receive(ENetPeer* peer, uint8_t* channelID) {
  2579. ENetIncomingCommand* incomingCommand;
  2580. ENetPacket* packet;
  2581. if (enet_list_empty(&peer->dispatchedCommands))
  2582. return NULL;
  2583. incomingCommand = (ENetIncomingCommand*)enet_list_remove(enet_list_begin(&peer->dispatchedCommands));
  2584. if (channelID != NULL)
  2585. *channelID = incomingCommand->command.header.channelID;
  2586. packet = incomingCommand->packet;
  2587. --packet->referenceCount;
  2588. if (incomingCommand->fragments != NULL)
  2589. enet_free(incomingCommand->fragments);
  2590. enet_free(incomingCommand);
  2591. peer->totalWaitingData -= packet->dataLength;
  2592. return packet;
  2593. }
  2594. static void enet_peer_reset_outgoing_commands(ENetList* queue) {
  2595. ENetOutgoingCommand* outgoingCommand;
  2596. while (!enet_list_empty(queue)) {
  2597. outgoingCommand = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(queue));
  2598. if (outgoingCommand->packet != NULL) {
  2599. --outgoingCommand->packet->referenceCount;
  2600. if (outgoingCommand->packet->referenceCount == 0)
  2601. enet_packet_destroy(outgoingCommand->packet);
  2602. }
  2603. enet_free(outgoingCommand);
  2604. }
  2605. }
  2606. static void enet_peer_remove_incoming_commands(ENetList* queue, ENetListIterator startCommand, ENetListIterator endCommand, ENetIncomingCommand* excludeCommand) {
  2607. ENetListIterator currentCommand;
  2608. for (currentCommand = startCommand; currentCommand != endCommand;) {
  2609. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2610. currentCommand = enet_list_next(currentCommand);
  2611. if (incomingCommand == excludeCommand)
  2612. continue;
  2613. enet_list_remove(&incomingCommand->incomingCommandList);
  2614. if (incomingCommand->packet != NULL) {
  2615. --incomingCommand->packet->referenceCount;
  2616. if (incomingCommand->packet->referenceCount == 0)
  2617. enet_packet_destroy(incomingCommand->packet);
  2618. }
  2619. if (incomingCommand->fragments != NULL)
  2620. enet_free(incomingCommand->fragments);
  2621. enet_free(incomingCommand);
  2622. }
  2623. }
  2624. static void enet_peer_reset_incoming_commands(ENetList* queue) {
  2625. enet_peer_remove_incoming_commands(queue, enet_list_begin(queue), enet_list_end(queue), NULL);
  2626. }
  2627. void enet_peer_reset_queues(ENetPeer* peer) {
  2628. ENetChannel* channel;
  2629. if (peer->needsDispatch) {
  2630. enet_list_remove(&peer->dispatchList);
  2631. peer->needsDispatch = 0;
  2632. }
  2633. while (!enet_list_empty(&peer->acknowledgements)) {
  2634. enet_free(enet_list_remove(enet_list_begin(&peer->acknowledgements)));
  2635. }
  2636. enet_peer_reset_outgoing_commands(&peer->sentReliableCommands);
  2637. enet_peer_reset_outgoing_commands(&peer->sentUnreliableCommands);
  2638. enet_peer_reset_outgoing_commands(&peer->outgoingCommands);
  2639. enet_peer_reset_incoming_commands(&peer->dispatchedCommands);
  2640. if (peer->channels != NULL && peer->channelCount > 0) {
  2641. for (channel = peer->channels; channel < &peer->channels[peer->channelCount]; ++channel) {
  2642. enet_peer_reset_incoming_commands(&channel->incomingReliableCommands);
  2643. enet_peer_reset_incoming_commands(&channel->incomingUnreliableCommands);
  2644. }
  2645. enet_free(peer->channels);
  2646. }
  2647. peer->channels = NULL;
  2648. peer->channelCount = 0;
  2649. }
  2650. void enet_peer_on_connect(ENetPeer* peer) {
  2651. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  2652. if (peer->incomingBandwidth != 0)
  2653. ++peer->host->bandwidthLimitedPeers;
  2654. ++peer->host->connectedPeers;
  2655. }
  2656. }
  2657. void enet_peer_on_disconnect(ENetPeer* peer) {
  2658. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2659. if (peer->incomingBandwidth != 0)
  2660. --peer->host->bandwidthLimitedPeers;
  2661. --peer->host->connectedPeers;
  2662. }
  2663. }
  2664. void enet_peer_reset(ENetPeer* peer) {
  2665. enet_peer_on_disconnect(peer);
  2666. peer->outgoingPeerID = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  2667. peer->state = ENET_PEER_STATE_DISCONNECTED;
  2668. peer->incomingBandwidth = 0;
  2669. peer->outgoingBandwidth = 0;
  2670. peer->incomingBandwidthThrottleEpoch = 0;
  2671. peer->outgoingBandwidthThrottleEpoch = 0;
  2672. peer->incomingDataTotal = 0;
  2673. peer->totalDataReceived = 0;
  2674. peer->outgoingDataTotal = 0;
  2675. peer->totalDataSent = 0;
  2676. peer->lastSendTime = 0;
  2677. peer->lastReceiveTime = 0;
  2678. peer->nextTimeout = 0;
  2679. peer->earliestTimeout = 0;
  2680. peer->totalPacketsSent = 0;
  2681. peer->totalPacketsLost = 0;
  2682. peer->packetThrottle = ENET_PEER_DEFAULT_PACKET_THROTTLE;
  2683. peer->packetThrottleThreshold = ENET_PEER_PACKET_THROTTLE_THRESHOLD;
  2684. peer->packetThrottleLimit = ENET_PEER_PACKET_THROTTLE_SCALE;
  2685. peer->packetThrottleCounter = 0;
  2686. peer->packetThrottleEpoch = 0;
  2687. peer->packetThrottleAcceleration = ENET_PEER_PACKET_THROTTLE_ACCELERATION;
  2688. peer->packetThrottleDeceleration = ENET_PEER_PACKET_THROTTLE_DECELERATION;
  2689. peer->packetThrottleInterval = ENET_PEER_PACKET_THROTTLE_INTERVAL;
  2690. peer->pingInterval = ENET_PEER_PING_INTERVAL;
  2691. peer->timeoutLimit = ENET_PEER_TIMEOUT_LIMIT;
  2692. peer->timeoutMinimum = ENET_PEER_TIMEOUT_MINIMUM;
  2693. peer->timeoutMaximum = ENET_PEER_TIMEOUT_MAXIMUM;
  2694. peer->lastRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2695. peer->lowestRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2696. peer->lastRoundTripTimeVariance = 0;
  2697. peer->highestRoundTripTimeVariance = 0;
  2698. peer->roundTripTime = 1;
  2699. peer->roundTripTimeVariance = 0;
  2700. peer->mtu = peer->host->mtu;
  2701. peer->reliableDataInTransit = 0;
  2702. peer->outgoingReliableSequenceNumber = 0;
  2703. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  2704. peer->incomingUnsequencedGroup = 0;
  2705. peer->outgoingUnsequencedGroup = 0;
  2706. peer->eventData = 0;
  2707. peer->totalWaitingData = 0;
  2708. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  2709. enet_peer_reset_queues(peer);
  2710. }
  2711. void enet_peer_ping(ENetPeer* peer) {
  2712. ENetProtocol command;
  2713. if (peer->state != ENET_PEER_STATE_CONNECTED)
  2714. return;
  2715. command.header.command = ENET_PROTOCOL_COMMAND_PING | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2716. command.header.channelID = 0xFF;
  2717. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2718. }
  2719. void enet_peer_ping_interval(ENetPeer* peer, uint32_t pingInterval) {
  2720. peer->pingInterval = pingInterval ? pingInterval : ENET_PEER_PING_INTERVAL;
  2721. }
  2722. void enet_peer_timeout(ENetPeer* peer, uint32_t timeoutLimit, uint32_t timeoutMinimum, uint32_t timeoutMaximum) {
  2723. peer->timeoutLimit = timeoutLimit ? timeoutLimit : ENET_PEER_TIMEOUT_LIMIT;
  2724. peer->timeoutMinimum = timeoutMinimum ? timeoutMinimum : ENET_PEER_TIMEOUT_MINIMUM;
  2725. peer->timeoutMaximum = timeoutMaximum ? timeoutMaximum : ENET_PEER_TIMEOUT_MAXIMUM;
  2726. }
  2727. void enet_peer_disconnect_now(ENetPeer* peer, uint32_t data) {
  2728. ENetProtocol command;
  2729. if (peer->state == ENET_PEER_STATE_DISCONNECTED)
  2730. return;
  2731. if (peer->state != ENET_PEER_STATE_ZOMBIE && peer->state != ENET_PEER_STATE_DISCONNECTING) {
  2732. enet_peer_reset_queues(peer);
  2733. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2734. command.header.channelID = 0xFF;
  2735. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2736. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2737. enet_host_flush(peer->host);
  2738. }
  2739. enet_peer_reset(peer);
  2740. }
  2741. void enet_peer_disconnect(ENetPeer* peer, uint32_t data) {
  2742. ENetProtocol command;
  2743. if (peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT || peer->state == ENET_PEER_STATE_ZOMBIE)
  2744. return;
  2745. enet_peer_reset_queues(peer);
  2746. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT;
  2747. command.header.channelID = 0xFF;
  2748. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2749. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2750. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2751. else
  2752. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2753. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2754. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2755. enet_peer_on_disconnect(peer);
  2756. peer->state = ENET_PEER_STATE_DISCONNECTING;
  2757. }
  2758. else {
  2759. enet_host_flush(peer->host);
  2760. enet_peer_reset(peer);
  2761. }
  2762. }
  2763. void enet_peer_disconnect_later(ENetPeer* peer, uint32_t data) {
  2764. if ((peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) && !(enet_list_empty(&peer->outgoingCommands) && enet_list_empty(&peer->sentReliableCommands))) {
  2765. peer->state = ENET_PEER_STATE_DISCONNECT_LATER;
  2766. peer->eventData = data;
  2767. }
  2768. else {
  2769. enet_peer_disconnect(peer, data);
  2770. }
  2771. }
  2772. ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer* peer, const ENetProtocol* command, uint16_t sentTime) {
  2773. ENetAcknowledgement* acknowledgement;
  2774. if (command->header.channelID < peer->channelCount) {
  2775. ENetChannel* channel = &peer->channels[command->header.channelID];
  2776. uint16_t reliableWindow = command->header.reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2777. uint16_t currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2778. if (command->header.reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2779. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2780. if (reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1 && reliableWindow <= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS)
  2781. return NULL;
  2782. }
  2783. acknowledgement = (ENetAcknowledgement*)enet_malloc(sizeof(ENetAcknowledgement));
  2784. if (acknowledgement == NULL)
  2785. return NULL;
  2786. peer->outgoingDataTotal += sizeof(ENetProtocolAcknowledge);
  2787. acknowledgement->sentTime = sentTime;
  2788. acknowledgement->command = *command;
  2789. enet_list_insert(enet_list_end(&peer->acknowledgements), acknowledgement);
  2790. return acknowledgement;
  2791. }
  2792. void enet_peer_setup_outgoing_command(ENetPeer* peer, ENetOutgoingCommand* outgoingCommand) {
  2793. ENetChannel* channel = &peer->channels[outgoingCommand->command.header.channelID];
  2794. peer->outgoingDataTotal += enet_protocol_command_size(outgoingCommand->command.header.command) + outgoingCommand->fragmentLength;
  2795. if (outgoingCommand->command.header.channelID == 0xFF) {
  2796. ++peer->outgoingReliableSequenceNumber;
  2797. outgoingCommand->reliableSequenceNumber = peer->outgoingReliableSequenceNumber;
  2798. outgoingCommand->unreliableSequenceNumber = 0;
  2799. }
  2800. else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2801. ++channel->outgoingReliableSequenceNumber;
  2802. channel->outgoingUnreliableSequenceNumber = 0;
  2803. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2804. outgoingCommand->unreliableSequenceNumber = 0;
  2805. }
  2806. else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED) {
  2807. ++peer->outgoingUnsequencedGroup;
  2808. outgoingCommand->reliableSequenceNumber = 0;
  2809. outgoingCommand->unreliableSequenceNumber = 0;
  2810. }
  2811. else {
  2812. if (outgoingCommand->fragmentOffset == 0)
  2813. ++channel->outgoingUnreliableSequenceNumber;
  2814. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2815. outgoingCommand->unreliableSequenceNumber = channel->outgoingUnreliableSequenceNumber;
  2816. }
  2817. outgoingCommand->sendAttempts = 0;
  2818. outgoingCommand->sentTime = 0;
  2819. outgoingCommand->roundTripTimeout = 0;
  2820. outgoingCommand->roundTripTimeoutLimit = 0;
  2821. outgoingCommand->command.header.reliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->reliableSequenceNumber);
  2822. switch (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2823. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2824. outgoingCommand->command.sendUnreliable.unreliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->unreliableSequenceNumber);
  2825. break;
  2826. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2827. outgoingCommand->command.sendUnsequenced.unsequencedGroup = ENET_HOST_TO_NET_16(peer->outgoingUnsequencedGroup);
  2828. break;
  2829. default:
  2830. break;
  2831. }
  2832. enet_list_insert(enet_list_end(&peer->outgoingCommands), outgoingCommand);
  2833. }
  2834. ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer* peer, const ENetProtocol* command, ENetPacket* packet, uint32_t offset, uint16_t length) {
  2835. ENetOutgoingCommand* outgoingCommand = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2836. if (outgoingCommand == NULL)
  2837. return NULL;
  2838. outgoingCommand->command = *command;
  2839. outgoingCommand->fragmentOffset = offset;
  2840. outgoingCommand->fragmentLength = length;
  2841. outgoingCommand->packet = packet;
  2842. if (packet != NULL)
  2843. ++packet->referenceCount;
  2844. enet_peer_setup_outgoing_command(peer, outgoingCommand);
  2845. return outgoingCommand;
  2846. }
  2847. void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer* peer, ENetChannel* channel, ENetIncomingCommand* queuedCommand) {
  2848. ENetListIterator droppedCommand, startCommand, currentCommand;
  2849. for (droppedCommand = startCommand = currentCommand = enet_list_begin(&channel->incomingUnreliableCommands); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2850. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2851. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2852. continue;
  2853. if (incomingCommand->reliableSequenceNumber == channel->incomingReliableSequenceNumber) {
  2854. if (incomingCommand->fragmentsRemaining <= 0) {
  2855. channel->incomingUnreliableSequenceNumber = incomingCommand->unreliableSequenceNumber;
  2856. continue;
  2857. }
  2858. if (startCommand != currentCommand) {
  2859. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2860. if (!peer->needsDispatch) {
  2861. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2862. peer->needsDispatch = 1;
  2863. }
  2864. droppedCommand = currentCommand;
  2865. }
  2866. else if (droppedCommand != currentCommand) {
  2867. droppedCommand = enet_list_previous(currentCommand);
  2868. }
  2869. }
  2870. else {
  2871. uint16_t reliableWindow = incomingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2872. uint16_t currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2873. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2874. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2875. if (reliableWindow >= currentWindow && reliableWindow < currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2876. break;
  2877. droppedCommand = enet_list_next(currentCommand);
  2878. if (startCommand != currentCommand) {
  2879. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2880. if (!peer->needsDispatch) {
  2881. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2882. peer->needsDispatch = 1;
  2883. }
  2884. }
  2885. }
  2886. startCommand = enet_list_next(currentCommand);
  2887. }
  2888. if (startCommand != currentCommand) {
  2889. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2890. if (!peer->needsDispatch) {
  2891. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2892. peer->needsDispatch = 1;
  2893. }
  2894. droppedCommand = currentCommand;
  2895. }
  2896. enet_peer_remove_incoming_commands(&channel->incomingUnreliableCommands, enet_list_begin(&channel->incomingUnreliableCommands), droppedCommand, queuedCommand);
  2897. }
  2898. void enet_peer_dispatch_incoming_reliable_commands(ENetPeer* peer, ENetChannel* channel, ENetIncomingCommand* queuedCommand) {
  2899. ENetListIterator currentCommand;
  2900. for (currentCommand = enet_list_begin(&channel->incomingReliableCommands); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2901. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2902. if (incomingCommand->fragmentsRemaining > 0 || incomingCommand->reliableSequenceNumber != (uint16_t)(channel->incomingReliableSequenceNumber + 1))
  2903. break;
  2904. channel->incomingReliableSequenceNumber = incomingCommand->reliableSequenceNumber;
  2905. if (incomingCommand->fragmentCount > 0)
  2906. channel->incomingReliableSequenceNumber += incomingCommand->fragmentCount - 1;
  2907. }
  2908. if (currentCommand == enet_list_begin(&channel->incomingReliableCommands))
  2909. return;
  2910. channel->incomingUnreliableSequenceNumber = 0;
  2911. enet_list_move(enet_list_end(&peer->dispatchedCommands), enet_list_begin(&channel->incomingReliableCommands), enet_list_previous(currentCommand));
  2912. if (!peer->needsDispatch) {
  2913. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2914. peer->needsDispatch = 1;
  2915. }
  2916. if (!enet_list_empty(&channel->incomingUnreliableCommands))
  2917. enet_peer_dispatch_incoming_unreliable_commands(peer, channel, queuedCommand);
  2918. }
  2919. ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer* peer, const ENetProtocol* command, const void* data, size_t dataLength, uint32_t flags, uint32_t fragmentCount) {
  2920. static ENetIncomingCommand dummyCommand;
  2921. ENetChannel* channel = &peer->channels[command->header.channelID];
  2922. uint32_t unreliableSequenceNumber = 0, reliableSequenceNumber = 0;
  2923. uint16_t reliableWindow, currentWindow;
  2924. ENetIncomingCommand* incomingCommand;
  2925. ENetListIterator currentCommand;
  2926. ENetPacket* packet = NULL;
  2927. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2928. goto discardCommand;
  2929. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) {
  2930. reliableSequenceNumber = command->header.reliableSequenceNumber;
  2931. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2932. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2933. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2934. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2935. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2936. goto discardCommand;
  2937. }
  2938. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2939. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2940. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2941. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber)
  2942. goto discardCommand;
  2943. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2944. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2945. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2946. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2947. continue;
  2948. }
  2949. else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2950. break;
  2951. }
  2952. if (incomingCommand->reliableSequenceNumber <= reliableSequenceNumber) {
  2953. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2954. break;
  2955. goto discardCommand;
  2956. }
  2957. }
  2958. break;
  2959. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2960. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  2961. unreliableSequenceNumber = ENET_NET_TO_HOST_16(command->sendUnreliable.unreliableSequenceNumber);
  2962. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && unreliableSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  2963. goto discardCommand;
  2964. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2965. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2966. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2967. continue;
  2968. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2969. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2970. continue;
  2971. }
  2972. else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2973. break;
  2974. }
  2975. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2976. break;
  2977. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  2978. continue;
  2979. if (incomingCommand->unreliableSequenceNumber <= unreliableSequenceNumber) {
  2980. if (incomingCommand->unreliableSequenceNumber < unreliableSequenceNumber)
  2981. break;
  2982. goto discardCommand;
  2983. }
  2984. }
  2985. break;
  2986. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2987. currentCommand = enet_list_end(&channel->incomingUnreliableCommands);
  2988. break;
  2989. default:
  2990. goto discardCommand;
  2991. }
  2992. if (peer->totalWaitingData >= peer->host->maximumWaitingData)
  2993. goto notifyError;
  2994. packet = enet_packet_create(data, dataLength, flags);
  2995. if (packet == NULL)
  2996. goto notifyError;
  2997. incomingCommand = (ENetIncomingCommand*)enet_malloc(sizeof(ENetIncomingCommand));
  2998. if (incomingCommand == NULL)
  2999. goto notifyError;
  3000. incomingCommand->reliableSequenceNumber = command->header.reliableSequenceNumber;
  3001. incomingCommand->unreliableSequenceNumber = unreliableSequenceNumber & 0xFFFF;
  3002. incomingCommand->command = *command;
  3003. incomingCommand->fragmentCount = fragmentCount;
  3004. incomingCommand->fragmentsRemaining = fragmentCount;
  3005. incomingCommand->packet = packet;
  3006. incomingCommand->fragments = NULL;
  3007. if (fragmentCount > 0) {
  3008. if (fragmentCount <= ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  3009. incomingCommand->fragments = (uint32_t*)enet_malloc((fragmentCount + 31) / 32 * sizeof(uint32_t));
  3010. if (incomingCommand->fragments == NULL) {
  3011. enet_free(incomingCommand);
  3012. goto notifyError;
  3013. }
  3014. memset(incomingCommand->fragments, 0, (fragmentCount + 31) / 32 * sizeof(uint32_t));
  3015. }
  3016. if (packet != NULL) {
  3017. ++packet->referenceCount;
  3018. peer->totalWaitingData += packet->dataLength;
  3019. }
  3020. enet_list_insert(enet_list_next(currentCommand), incomingCommand);
  3021. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  3022. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  3023. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  3024. enet_peer_dispatch_incoming_reliable_commands(peer, channel, incomingCommand);
  3025. break;
  3026. default:
  3027. enet_peer_dispatch_incoming_unreliable_commands(peer, channel, incomingCommand);
  3028. break;
  3029. }
  3030. return incomingCommand;
  3031. discardCommand:
  3032. if (fragmentCount > 0)
  3033. goto notifyError;
  3034. if (packet != NULL && packet->referenceCount == 0)
  3035. enet_packet_destroy(packet);
  3036. return &dummyCommand;
  3037. notifyError:
  3038. if (packet != NULL && packet->referenceCount == 0)
  3039. enet_packet_destroy(packet);
  3040. return NULL;
  3041. }
  3042. /*
  3043. =======================================================================
  3044. Host
  3045. =======================================================================
  3046. */
  3047. ENetHost* enet_host_create(const ENetAddress* address, size_t peerCount, size_t channelLimit, uint32_t incomingBandwidth, uint32_t outgoingBandwidth, int bufferSize) {
  3048. ENetHost* host;
  3049. ENetPeer* currentPeer;
  3050. ENET_LOG_TRACE("Creating ENet host object.");
  3051. if (peerCount > ENET_PROTOCOL_MAXIMUM_PEER_ID) {
  3052. ENET_LOG_ERROR("Creation failure: Peer count greater than maximum allowed (%u)", ENET_PROTOCOL_MAXIMUM_PEER_ID);
  3053. return NULL;
  3054. }
  3055. host = (ENetHost*)enet_malloc(sizeof(ENetHost));
  3056. if (host == NULL) {
  3057. ENET_LOG_ERROR("Creation failure: Memory allocation failure. Wanted %u bytes", sizeof(ENetHost));
  3058. return NULL;
  3059. }
  3060. memset(host, 0, sizeof(ENetHost));
  3061. host->peers = (ENetPeer*)enet_malloc(peerCount * sizeof(ENetPeer));
  3062. if (host->peers == NULL) {
  3063. ENET_LOG_ERROR("Creation failure: Peer array memory allocation failure. Wanted %u bytes", peerCount * sizeof(ENetHost));
  3064. enet_free(host);
  3065. return NULL;
  3066. }
  3067. memset(host->peers, 0, peerCount * sizeof(ENetPeer));
  3068. host->socket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
  3069. if (host->socket != ENET_SOCKET_NULL) {
  3070. ENET_LOG_TRACE("Socket creation: IPv4 & IPv6 dual stack mode");
  3071. enet_socket_set_option(host->socket, ENET_SOCKOPT_IPV6_V6ONLY, 0);
  3072. }
  3073. int bindResult = enet_socket_bind(host->socket, address);
  3074. if (host->socket == ENET_SOCKET_NULL || (address != NULL && bindResult < 0)) {
  3075. if (host->socket != ENET_SOCKET_NULL) {
  3076. ENET_LOG_TRACE("Socket creation: Cleaning up a old socket.");
  3077. enet_socket_destroy(host->socket);
  3078. }
  3079. ENET_LOG_ERROR("Socket creation: Binding to socket failed with error code %i", bindResult);
  3080. enet_free(host->peers);
  3081. enet_free(host);
  3082. return NULL;
  3083. }
  3084. ENET_LOG_TRACE("Buffers: Setting up");
  3085. if (bufferSize > ENET_HOST_BUFFER_SIZE_MAX)
  3086. bufferSize = ENET_HOST_BUFFER_SIZE_MAX;
  3087. else if (bufferSize < ENET_HOST_BUFFER_SIZE_MIN)
  3088. bufferSize = ENET_HOST_BUFFER_SIZE_MIN;
  3089. ENET_LOG_TRACE("Socket: Setting up options");
  3090. enet_socket_set_option(host->socket, ENET_SOCKOPT_NONBLOCK, 1);
  3091. enet_socket_set_option(host->socket, ENET_SOCKOPT_BROADCAST, 1);
  3092. enet_socket_set_option(host->socket, ENET_SOCKOPT_RCVBUF, bufferSize);
  3093. enet_socket_set_option(host->socket, ENET_SOCKOPT_SNDBUF, bufferSize);
  3094. ENET_LOG_TRACE("Address: Setting up");
  3095. if (address != NULL && enet_socket_get_address(host->socket, &host->address) < 0)
  3096. host->address = *address;
  3097. ENET_LOG_TRACE("Channels: Setting up");
  3098. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3099. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3100. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3101. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3102. host->randomSeed = (uint32_t)(size_t)host;
  3103. host->randomSeed += enet_host_random_seed();
  3104. host->randomSeed = (host->randomSeed << 16) | (host->randomSeed >> 16);
  3105. host->channelLimit = channelLimit;
  3106. host->incomingBandwidth = incomingBandwidth;
  3107. host->outgoingBandwidth = outgoingBandwidth;
  3108. host->bandwidthThrottleEpoch = 0;
  3109. host->recalculateBandwidthLimits = 0;
  3110. host->preventConnections = 0;
  3111. host->mtu = ENET_HOST_DEFAULT_MTU;
  3112. host->peerCount = peerCount;
  3113. host->commandCount = 0;
  3114. host->bufferCount = 0;
  3115. host->checksumCallback = NULL;
  3116. host->receivedAddress.ipv6 = ENET_HOST_ANY;
  3117. host->receivedAddress.port = 0;
  3118. host->receivedData = NULL;
  3119. host->receivedDataLength = 0;
  3120. host->totalSentData = 0;
  3121. host->totalSentPackets = 0;
  3122. host->totalReceivedData = 0;
  3123. host->totalReceivedPackets = 0;
  3124. host->connectedPeers = 0;
  3125. host->bandwidthLimitedPeers = 0;
  3126. host->duplicatePeers = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  3127. host->maximumPacketSize = ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE;
  3128. host->maximumWaitingData = ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA;
  3129. host->interceptCallback = NULL;
  3130. ENET_LOG_TRACE("Startup: Clearing queues");
  3131. enet_list_clear(&host->dispatchQueue);
  3132. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3133. currentPeer->host = host;
  3134. currentPeer->incomingPeerID = currentPeer - host->peers;
  3135. currentPeer->outgoingSessionID = currentPeer->incomingSessionID = 0xFF;
  3136. currentPeer->data = NULL;
  3137. enet_list_clear(&currentPeer->acknowledgements);
  3138. enet_list_clear(&currentPeer->sentReliableCommands);
  3139. enet_list_clear(&currentPeer->sentUnreliableCommands);
  3140. enet_list_clear(&currentPeer->outgoingCommands);
  3141. enet_list_clear(&currentPeer->dispatchedCommands);
  3142. enet_peer_reset(currentPeer);
  3143. }
  3144. ENET_LOG_TRACE("Startup: Complete. Let's do this.");
  3145. return host;
  3146. }
  3147. void enet_host_destroy(ENetHost* host) {
  3148. ENetPeer* currentPeer;
  3149. ENET_LOG_TRACE("A ENet host object is being destroyed.");
  3150. if (host == NULL)
  3151. return;
  3152. enet_socket_destroy(host->socket);
  3153. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3154. enet_peer_reset(currentPeer);
  3155. }
  3156. enet_free(host->peers);
  3157. enet_free(host);
  3158. }
  3159. void enet_host_prevent_connections(ENetHost* host, uint8_t state) {
  3160. if (host == NULL)
  3161. return;
  3162. host->preventConnections = state;
  3163. }
  3164. ENetPeer* enet_host_connect(ENetHost* host, const ENetAddress* address, size_t channelCount, uint32_t data) {
  3165. ENET_LOG_TRACE("A ENet Host is trying to establish a connection.");
  3166. ENetPeer* currentPeer;
  3167. ENetChannel* channel;
  3168. ENetProtocol command;
  3169. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3170. channelCount = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3171. else if (channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3172. channelCount = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3173. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3174. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED)
  3175. break;
  3176. }
  3177. if (currentPeer >= &host->peers[host->peerCount])
  3178. return NULL;
  3179. currentPeer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  3180. if (currentPeer->channels == NULL)
  3181. return NULL;
  3182. currentPeer->channelCount = channelCount;
  3183. currentPeer->state = ENET_PEER_STATE_CONNECTING;
  3184. currentPeer->address = *address;
  3185. currentPeer->connectID = ++host->randomSeed;
  3186. if (host->outgoingBandwidth == 0)
  3187. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3188. else
  3189. currentPeer->windowSize = (host->outgoingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3190. if (currentPeer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  3191. currentPeer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3192. else if (currentPeer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  3193. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3194. for (channel = currentPeer->channels; channel < &currentPeer->channels[channelCount]; ++channel) {
  3195. channel->outgoingReliableSequenceNumber = 0;
  3196. channel->outgoingUnreliableSequenceNumber = 0;
  3197. channel->incomingReliableSequenceNumber = 0;
  3198. channel->incomingUnreliableSequenceNumber = 0;
  3199. enet_list_clear(&channel->incomingReliableCommands);
  3200. enet_list_clear(&channel->incomingUnreliableCommands);
  3201. channel->usedReliableWindows = 0;
  3202. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  3203. }
  3204. command.header.command = ENET_PROTOCOL_COMMAND_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3205. command.header.channelID = 0xFF;
  3206. command.connect.outgoingPeerID = ENET_HOST_TO_NET_16(currentPeer->incomingPeerID);
  3207. command.connect.incomingSessionID = currentPeer->incomingSessionID;
  3208. command.connect.outgoingSessionID = currentPeer->outgoingSessionID;
  3209. command.connect.mtu = ENET_HOST_TO_NET_32(currentPeer->mtu);
  3210. command.connect.windowSize = ENET_HOST_TO_NET_32(currentPeer->windowSize);
  3211. command.connect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  3212. command.connect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  3213. command.connect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3214. command.connect.packetThrottleInterval = ENET_HOST_TO_NET_32(currentPeer->packetThrottleInterval);
  3215. command.connect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleAcceleration);
  3216. command.connect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleDeceleration);
  3217. command.connect.connectID = currentPeer->connectID;
  3218. command.connect.data = ENET_HOST_TO_NET_32(data);
  3219. enet_peer_queue_outgoing_command(currentPeer, &command, NULL, 0, 0);
  3220. return currentPeer;
  3221. }
  3222. void enet_host_broadcast(ENetHost* host, uint8_t channelID, ENetPacket* packet) {
  3223. ENetPeer* currentPeer;
  3224. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3225. ++packet->referenceCount;
  3226. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3227. if (currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3228. continue;
  3229. enet_peer_send(currentPeer, channelID, packet);
  3230. }
  3231. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3232. --packet->referenceCount;
  3233. if (packet->referenceCount == 0)
  3234. enet_packet_destroy(packet);
  3235. }
  3236. void enet_host_broadcast_exclude(ENetHost* host, uint8_t channelID, ENetPacket* packet, ENetPeer* excludedPeer) {
  3237. ENetPeer* currentPeer;
  3238. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3239. ++packet->referenceCount;
  3240. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3241. if (currentPeer->state != ENET_PEER_STATE_CONNECTED || currentPeer == excludedPeer)
  3242. continue;
  3243. enet_peer_send(currentPeer, channelID, packet);
  3244. }
  3245. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3246. --packet->referenceCount;
  3247. if (packet->referenceCount == 0)
  3248. enet_packet_destroy(packet);
  3249. }
  3250. void enet_host_broadcast_selective(ENetHost* host, uint8_t channelID, ENetPacket* packet, ENetPeer** peers, size_t length) {
  3251. ENetPeer* currentPeer;
  3252. size_t i;
  3253. if (host == NULL)
  3254. return;
  3255. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3256. ++packet->referenceCount;
  3257. for (i = 0; i < length; i++) {
  3258. currentPeer = peers[i];
  3259. if (currentPeer == NULL || currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3260. continue;
  3261. enet_peer_send(currentPeer, channelID, packet);
  3262. }
  3263. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3264. --packet->referenceCount;
  3265. if (packet->referenceCount == 0)
  3266. enet_packet_destroy(packet);
  3267. }
  3268. void enet_host_channel_limit(ENetHost* host, size_t channelLimit) {
  3269. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3270. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3271. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3272. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3273. host->channelLimit = channelLimit;
  3274. }
  3275. void enet_host_bandwidth_limit(ENetHost* host, uint32_t incomingBandwidth, uint32_t outgoingBandwidth) {
  3276. host->incomingBandwidth = incomingBandwidth;
  3277. host->outgoingBandwidth = outgoingBandwidth;
  3278. host->recalculateBandwidthLimits = 1;
  3279. }
  3280. void enet_host_bandwidth_throttle(ENetHost* host) {
  3281. uint32_t timeCurrent = enet_time_get();
  3282. uint32_t elapsedTime = timeCurrent - host->bandwidthThrottleEpoch;
  3283. uint32_t peersRemaining = (uint32_t)host->connectedPeers;
  3284. uint32_t dataTotal = ~0;
  3285. uint32_t bandwidth = ~0;
  3286. uint32_t throttle = 0;
  3287. uint32_t bandwidthLimit = 0;
  3288. int needsAdjustment = host->bandwidthLimitedPeers > 0 ? 1 : 0;
  3289. ENetPeer* peer;
  3290. ENetProtocol command;
  3291. if (elapsedTime < ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  3292. return;
  3293. if (host->outgoingBandwidth == 0 && host->incomingBandwidth == 0)
  3294. return;
  3295. host->bandwidthThrottleEpoch = timeCurrent;
  3296. if (peersRemaining == 0)
  3297. return;
  3298. if (host->outgoingBandwidth != 0) {
  3299. dataTotal = 0;
  3300. bandwidth = (host->outgoingBandwidth * elapsedTime) / 1000;
  3301. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3302. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3303. continue;
  3304. dataTotal += peer->outgoingDataTotal;
  3305. }
  3306. }
  3307. while (peersRemaining > 0 && needsAdjustment != 0) {
  3308. needsAdjustment = 0;
  3309. if (dataTotal <= bandwidth)
  3310. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3311. else
  3312. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3313. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3314. uint32_t peerBandwidth;
  3315. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidth == 0 || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3316. continue;
  3317. peerBandwidth = (peer->incomingBandwidth * elapsedTime) / 1000;
  3318. if ((throttle * peer->outgoingDataTotal) / ENET_PEER_PACKET_THROTTLE_SCALE <= peerBandwidth)
  3319. continue;
  3320. peer->packetThrottleLimit = (peerBandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / peer->outgoingDataTotal;
  3321. if (peer->packetThrottleLimit == 0)
  3322. peer->packetThrottleLimit = 1;
  3323. if (peer->packetThrottle > peer->packetThrottleLimit)
  3324. peer->packetThrottle = peer->packetThrottleLimit;
  3325. peer->outgoingBandwidthThrottleEpoch = timeCurrent;
  3326. peer->incomingDataTotal = 0;
  3327. peer->outgoingDataTotal = 0;
  3328. needsAdjustment = 1;
  3329. --peersRemaining;
  3330. bandwidth -= peerBandwidth;
  3331. dataTotal -= peerBandwidth;
  3332. }
  3333. }
  3334. if (peersRemaining > 0) {
  3335. if (dataTotal <= bandwidth)
  3336. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3337. else
  3338. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3339. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3340. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3341. continue;
  3342. peer->packetThrottleLimit = throttle;
  3343. if (peer->packetThrottle > peer->packetThrottleLimit)
  3344. peer->packetThrottle = peer->packetThrottleLimit;
  3345. peer->incomingDataTotal = 0;
  3346. peer->outgoingDataTotal = 0;
  3347. }
  3348. }
  3349. if (host->recalculateBandwidthLimits) {
  3350. host->recalculateBandwidthLimits = 0;
  3351. peersRemaining = (uint32_t)host->connectedPeers;
  3352. bandwidth = host->incomingBandwidth;
  3353. needsAdjustment = 1;
  3354. if (bandwidth == 0) {
  3355. bandwidthLimit = 0;
  3356. }
  3357. else {
  3358. while (peersRemaining > 0 && needsAdjustment != 0) {
  3359. needsAdjustment = 0;
  3360. bandwidthLimit = bandwidth / peersRemaining;
  3361. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3362. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3363. continue;
  3364. if (peer->outgoingBandwidth > 0 && peer->outgoingBandwidth >= bandwidthLimit)
  3365. continue;
  3366. peer->incomingBandwidthThrottleEpoch = timeCurrent;
  3367. needsAdjustment = 1;
  3368. --peersRemaining;
  3369. bandwidth -= peer->outgoingBandwidth;
  3370. }
  3371. }
  3372. }
  3373. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3374. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3375. continue;
  3376. command.header.command = ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3377. command.header.channelID = 0xFF;
  3378. command.bandwidthLimit.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3379. if (peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3380. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(peer->outgoingBandwidth);
  3381. else
  3382. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(bandwidthLimit);
  3383. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  3384. }
  3385. }
  3386. }
  3387. /*
  3388. =======================================================================
  3389. Address
  3390. =======================================================================
  3391. */
  3392. int enet_address_set_ip(ENetAddress* address, const char* ip) {
  3393. int type = AF_INET6;
  3394. void* destination = &address->ipv6;
  3395. if (strchr(ip, ':') == NULL) {
  3396. type = AF_INET;
  3397. memset(address, 0, sizeof(address->ipv4.zeros));
  3398. address->ipv4.ffff = 0xFFFF;
  3399. destination = &address->ipv4.ip;
  3400. }
  3401. if (!inet_pton(type, ip, destination))
  3402. return -1;
  3403. return 0;
  3404. }
  3405. int enet_address_set_hostname(ENetAddress* address, const char* name) {
  3406. struct addrinfo hints, * resultList = NULL, * result = NULL;
  3407. memset(&hints, 0, sizeof(hints));
  3408. hints.ai_family = AF_UNSPEC;
  3409. if (getaddrinfo(name, NULL, &hints, &resultList) != 0) {
  3410. ENET_LOG_ERROR("Getaddrinfo() returned an error");
  3411. return -1;
  3412. }
  3413. for (result = resultList; result != NULL; result = result->ai_next) {
  3414. if (result->ai_addr != NULL && result->ai_addrlen >= sizeof(struct sockaddr_in)) {
  3415. if (result->ai_family == AF_INET) {
  3416. struct sockaddr_in* sin = (struct sockaddr_in*)result->ai_addr;
  3417. memset(address, 0, sizeof(address->ipv4.zeros));
  3418. address->ipv4.ffff = 0xFFFF;
  3419. address->ipv4.ip.s_addr = sin->sin_addr.s_addr;
  3420. freeaddrinfo(resultList);
  3421. return 0;
  3422. }
  3423. else if (result->ai_family == AF_INET6) {
  3424. struct sockaddr_in6* sin = (struct sockaddr_in6*)result->ai_addr;
  3425. address->ipv6 = sin->sin6_addr;
  3426. freeaddrinfo(resultList);
  3427. return 0;
  3428. }
  3429. }
  3430. }
  3431. if (resultList != NULL)
  3432. freeaddrinfo(resultList);
  3433. return enet_address_set_ip(address, name);
  3434. }
  3435. int enet_address_get_ip(const ENetAddress* address, char* ip, size_t ipLength) {
  3436. if (address->ipv4.ffff == 0xFFFF && enet_array_is_zeroed(address->ipv4.zeros, sizeof(address->ipv4.zeros)) == 0) {
  3437. if (inet_ntop(AF_INET, &address->ipv4.ip, ip, ipLength) == NULL) {
  3438. ENET_LOG_ERROR("inet_ntop returned an error.");
  3439. return -1;
  3440. }
  3441. }
  3442. else if (inet_ntop(AF_INET6, &address->ipv6, ip, ipLength) == NULL) {
  3443. ENET_LOG_ERROR("inet_ntop returned an error.");
  3444. return -1;
  3445. }
  3446. return 0;
  3447. }
  3448. int enet_address_get_hostname(const ENetAddress* address, char* name, size_t nameLength) {
  3449. struct sockaddr_in6 sin;
  3450. int err;
  3451. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3452. sin.sin6_family = AF_INET6;
  3453. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3454. sin.sin6_addr = address->ipv6;
  3455. err = getnameinfo((struct sockaddr*)&sin, sizeof(sin), name, nameLength, NULL, 0, NI_NAMEREQD);
  3456. if (!err) {
  3457. if (name != NULL && nameLength > 0 && !memchr(name, '\0', nameLength))
  3458. return -1;
  3459. return 0;
  3460. }
  3461. if (err != EAI_NONAME) {
  3462. ENET_LOG_ERROR("Getnameinfo() returned an error, code %i", err);
  3463. return -1;
  3464. }
  3465. return enet_address_get_ip(address, name, nameLength);
  3466. }
  3467. /*
  3468. =======================================================================
  3469. Platform-specific (Unix)
  3470. =======================================================================
  3471. */
  3472. #ifndef _WIN32
  3473. int enet_initialize(void) {
  3474. ENET_LOG_TRACE("Unix-like Environment: Initialization");
  3475. return 0;
  3476. }
  3477. void enet_deinitialize(void) {
  3478. ENET_LOG_TRACE("Unix-like Environment: Deinitialization");
  3479. }
  3480. uint64_t enet_host_random_seed(void) {
  3481. struct timeval timeVal;
  3482. gettimeofday(&timeVal, NULL);
  3483. return (timeVal.tv_sec * 1000) ^ (timeVal.tv_usec / 1000);
  3484. }
  3485. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3486. struct sockaddr_in6 sin;
  3487. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3488. sin.sin6_family = AF_INET6;
  3489. if (address != NULL) {
  3490. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3491. sin.sin6_addr = address->ipv6;
  3492. }
  3493. else {
  3494. sin.sin6_port = 0;
  3495. sin.sin6_addr = ENET_HOST_ANY;
  3496. }
  3497. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3498. }
  3499. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3500. struct sockaddr_storage ss;
  3501. socklen_t saLength = sizeof(ss);
  3502. if (getsockname(socket, (struct sockaddr*)&ss, &saLength) == -1) {
  3503. ENET_LOG_ERROR("Getsockname() error.");
  3504. return -1;
  3505. }
  3506. if (ss.ss_family == AF_INET) {
  3507. struct sockaddr_in* sin = (struct sockaddr_in*)&ss;
  3508. memset(address, 0, sizeof(address->ipv4.zeros));
  3509. address->ipv4.ffff = 0xFFFF;
  3510. address->ipv4.ip = sin->sin_addr;
  3511. address->port = ENET_NET_TO_HOST_16(sin->sin_port);
  3512. }
  3513. else if (ss.ss_family == AF_INET6) {
  3514. struct sockaddr_in6* sin = (struct sockaddr_in6*)&ss;
  3515. address->ipv6 = sin->sin6_addr;
  3516. address->port = ENET_NET_TO_HOST_16(sin->sin6_port);
  3517. }
  3518. return 0;
  3519. }
  3520. int enet_socket_listen(ENetSocket socket, int backlog) {
  3521. return listen(socket, backlog < 0 ? SOMAXCONN : backlog);
  3522. }
  3523. ENetSocket enet_socket_create(ENetSocketType type) {
  3524. int socketType = (type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM);
  3525. #ifdef SOCK_CLOEXEC
  3526. socketType |= SOCK_CLOEXEC;
  3527. #endif
  3528. return socket(PF_INET6, socketType, 0);
  3529. }
  3530. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3531. int result = -1;
  3532. switch (option) {
  3533. case ENET_SOCKOPT_NONBLOCK:
  3534. result = fcntl(socket, F_SETFL, (value ? O_NONBLOCK : 0) | (fcntl(socket, F_GETFL) & ~O_NONBLOCK));
  3535. break;
  3536. case ENET_SOCKOPT_BROADCAST:
  3537. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3538. break;
  3539. case ENET_SOCKOPT_REUSEADDR:
  3540. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3541. break;
  3542. case ENET_SOCKOPT_RCVBUF:
  3543. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3544. break;
  3545. case ENET_SOCKOPT_SNDBUF:
  3546. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3547. break;
  3548. case ENET_SOCKOPT_RCVTIMEO: {
  3549. struct timeval timeVal;
  3550. timeVal.tv_sec = value / 1000;
  3551. timeVal.tv_usec = (value % 1000) * 1000;
  3552. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3553. break;
  3554. }
  3555. case ENET_SOCKOPT_SNDTIMEO: {
  3556. struct timeval timeVal;
  3557. timeVal.tv_sec = value / 1000;
  3558. timeVal.tv_usec = (value % 1000) * 1000;
  3559. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3560. break;
  3561. }
  3562. case ENET_SOCKOPT_NODELAY:
  3563. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3564. break;
  3565. case ENET_SOCKOPT_IPV6_V6ONLY:
  3566. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3567. break;
  3568. default:
  3569. break;
  3570. }
  3571. return result == -1 ? -1 : 0;
  3572. }
  3573. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3574. int result = -1;
  3575. socklen_t len;
  3576. switch (option) {
  3577. case ENET_SOCKOPT_ERROR:
  3578. len = sizeof(int);
  3579. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, value, &len);
  3580. break;
  3581. default:
  3582. break;
  3583. }
  3584. return result == -1 ? -1 : 0;
  3585. }
  3586. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3587. int result = -1;
  3588. struct sockaddr_in6 sin;
  3589. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3590. sin.sin6_family = AF_INET6;
  3591. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3592. sin.sin6_addr = address->ipv6;
  3593. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3594. if (result == -1 && errno == EINPROGRESS)
  3595. return 0;
  3596. return result;
  3597. }
  3598. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3599. int result = -1;
  3600. struct sockaddr_in6 sin;
  3601. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3602. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3603. if (result == -1)
  3604. return ENET_SOCKET_NULL;
  3605. if (address != NULL) {
  3606. address->ipv6 = sin.sin6_addr;
  3607. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3608. }
  3609. return result;
  3610. }
  3611. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3612. return shutdown(socket, (int)how);
  3613. }
  3614. void enet_socket_destroy(ENetSocket socket) {
  3615. if (socket != ENET_SOCKET_NULL)
  3616. close(socket);
  3617. }
  3618. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3619. struct msghdr msgHdr;
  3620. struct sockaddr_in6 sin;
  3621. int sentLength;
  3622. memset(&msgHdr, 0, sizeof(struct msghdr));
  3623. if (address != NULL) {
  3624. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3625. sin.sin6_family = AF_INET6;
  3626. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3627. sin.sin6_addr = address->ipv6;
  3628. msgHdr.msg_name = &sin;
  3629. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3630. }
  3631. msgHdr.msg_iov = (struct iovec*)buffers;
  3632. msgHdr.msg_iovlen = bufferCount;
  3633. sentLength = sendmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3634. if (sentLength == -1) {
  3635. if (errno == EWOULDBLOCK)
  3636. return 0;
  3637. ENET_LOG_ERROR("An error occurred sending data to socket. sendMsg result is negative, returned code is %i.", errno);
  3638. return -1;
  3639. }
  3640. return sentLength;
  3641. }
  3642. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3643. struct msghdr msgHdr;
  3644. struct sockaddr_in6 sin;
  3645. int recvLength;
  3646. memset(&msgHdr, 0, sizeof(struct msghdr));
  3647. if (address != NULL) {
  3648. msgHdr.msg_name = &sin;
  3649. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3650. }
  3651. msgHdr.msg_iov = (struct iovec*)buffers;
  3652. msgHdr.msg_iovlen = bufferCount;
  3653. recvLength = recvmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3654. if (recvLength == -1) {
  3655. if (errno == EWOULDBLOCK)
  3656. return 0;
  3657. ENET_LOG_ERROR("An error occurred receiving data from socket. recvLength result is negative, returned code is %i.", errno);
  3658. return -1;
  3659. }
  3660. if (msgHdr.msg_flags & MSG_TRUNC) {
  3661. ENET_LOG_ERROR("Incoming socket message header was truncated.");
  3662. return -2;
  3663. }
  3664. if (address != NULL) {
  3665. address->ipv6 = sin.sin6_addr;
  3666. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3667. }
  3668. return recvLength;
  3669. }
  3670. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, uint32_t timeout) {
  3671. struct timeval timeVal;
  3672. timeVal.tv_sec = timeout / 1000;
  3673. timeVal.tv_usec = (timeout % 1000) * 1000;
  3674. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3675. }
  3676. int enet_socket_wait(ENetSocket socket, uint32_t* condition, uint64_t timeout) {
  3677. struct pollfd pollSocket;
  3678. int pollCount;
  3679. pollSocket.fd = socket;
  3680. pollSocket.events = 0;
  3681. if (*condition & ENET_SOCKET_WAIT_SEND)
  3682. pollSocket.events |= POLLOUT;
  3683. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3684. pollSocket.events |= POLLIN;
  3685. pollCount = poll(&pollSocket, 1, timeout);
  3686. if (pollCount < 0) {
  3687. if (errno == EINTR && *condition & ENET_SOCKET_WAIT_INTERRUPT) {
  3688. *condition = ENET_SOCKET_WAIT_INTERRUPT;
  3689. return 0;
  3690. }
  3691. ENET_LOG_ERROR("Socket wait: pollCount < 0, %i", pollCount);
  3692. return -1;
  3693. }
  3694. *condition = ENET_SOCKET_WAIT_NONE;
  3695. if (pollCount == 0)
  3696. return 0;
  3697. if (pollSocket.revents & POLLOUT)
  3698. *condition |= ENET_SOCKET_WAIT_SEND;
  3699. if (pollSocket.revents & POLLIN)
  3700. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3701. return 0;
  3702. }
  3703. #endif
  3704. /*
  3705. =======================================================================
  3706. Platform-specific (Windows)
  3707. =======================================================================
  3708. */
  3709. #ifdef _WIN32
  3710. int enet_initialize(void) {
  3711. WORD versionRequested = MAKEWORD(2, 2);
  3712. WSADATA wsaData;
  3713. ENET_LOG_TRACE("Windows: ENet init");
  3714. if (WSAStartup(versionRequested, &wsaData)) {
  3715. ENET_LOG_ERROR("WSAStartup failure");
  3716. return -1;
  3717. }
  3718. if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
  3719. ENET_LOG_ERROR("Winsock version mismatch");
  3720. WSACleanup();
  3721. return -1;
  3722. }
  3723. timeBeginPeriod(1);
  3724. return 0;
  3725. }
  3726. void enet_deinitialize(void) {
  3727. ENET_LOG_TRACE("Windows: ENet Deinit");
  3728. timeEndPeriod(1);
  3729. WSACleanup();
  3730. }
  3731. uint64_t enet_host_random_seed(void) {
  3732. return (uint64_t)timeGetTime();
  3733. }
  3734. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3735. struct sockaddr_in6 sin;
  3736. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3737. sin.sin6_family = AF_INET6;
  3738. if (address != NULL) {
  3739. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3740. sin.sin6_addr = address->ipv6;
  3741. }
  3742. else {
  3743. sin.sin6_port = 0;
  3744. sin.sin6_addr = in6addr_any;
  3745. }
  3746. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)) == SOCKET_ERROR ? -1 : 0;
  3747. }
  3748. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3749. struct sockaddr_storage ss;
  3750. int saLength = sizeof(ss);
  3751. if (getsockname(socket, (struct sockaddr*)&ss, &saLength) == -1)
  3752. ENET_LOG_ERROR("Socket getsockname failure.");
  3753. return -1;
  3754. if (ss.ss_family == AF_INET) {
  3755. struct sockaddr_in* sin = (struct sockaddr_in*)&ss;
  3756. memset(address, 0, sizeof(address->ipv4.zeros));
  3757. address->ipv4.ffff = 0xFFFF;
  3758. address->ipv4.ip = sin->sin_addr;
  3759. address->port = ENET_NET_TO_HOST_16(sin->sin_port);
  3760. }
  3761. else if (ss.ss_family == AF_INET6) {
  3762. struct sockaddr_in6* sin = (struct sockaddr_in6*)&ss;
  3763. address->ipv6 = sin->sin6_addr;
  3764. address->port = ENET_NET_TO_HOST_16(sin->sin6_port);
  3765. }
  3766. return 0;
  3767. }
  3768. int enet_socket_listen(ENetSocket socket, int backlog) {
  3769. return listen(socket, backlog < 0 ? SOMAXCONN : backlog) == SOCKET_ERROR ? -1 : 0;
  3770. }
  3771. ENetSocket enet_socket_create(ENetSocketType type) {
  3772. return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
  3773. }
  3774. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3775. int result = SOCKET_ERROR;
  3776. switch (option) {
  3777. case ENET_SOCKOPT_NONBLOCK: {
  3778. u_long nonBlocking = (u_long)value;
  3779. result = ioctlsocket(socket, FIONBIO, &nonBlocking);
  3780. break;
  3781. }
  3782. case ENET_SOCKOPT_BROADCAST:
  3783. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3784. break;
  3785. case ENET_SOCKOPT_REUSEADDR:
  3786. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3787. break;
  3788. case ENET_SOCKOPT_RCVBUF:
  3789. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3790. break;
  3791. case ENET_SOCKOPT_SNDBUF:
  3792. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3793. break;
  3794. case ENET_SOCKOPT_RCVTIMEO:
  3795. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&value, sizeof(int));
  3796. break;
  3797. case ENET_SOCKOPT_SNDTIMEO:
  3798. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&value, sizeof(int));
  3799. break;
  3800. case ENET_SOCKOPT_NODELAY:
  3801. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3802. break;
  3803. case ENET_SOCKOPT_IPV6_V6ONLY:
  3804. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3805. break;
  3806. default:
  3807. break;
  3808. }
  3809. return result == SOCKET_ERROR ? -1 : 0;
  3810. }
  3811. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3812. int result = SOCKET_ERROR, len;
  3813. switch (option) {
  3814. case ENET_SOCKOPT_ERROR:
  3815. len = sizeof(int);
  3816. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, (char*)value, &len);
  3817. break;
  3818. default:
  3819. break;
  3820. }
  3821. return result == SOCKET_ERROR ? -1 : 0;
  3822. }
  3823. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3824. int result = -1;
  3825. struct sockaddr_in6 sin;
  3826. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3827. sin.sin6_family = AF_INET6;
  3828. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3829. sin.sin6_addr = address->ipv6;
  3830. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3831. int lastError = WSAGetLastError();
  3832. if (result == SOCKET_ERROR && lastError != WSAEWOULDBLOCK) {
  3833. ENET_LOG_ERROR("Socket connect failure, return code: %i, WSAGetLastError: %i", result, lastError);
  3834. return -1;
  3835. }
  3836. ENET_LOG_TRACE("Socket connect.");
  3837. return 0;
  3838. }
  3839. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3840. SOCKET result;
  3841. struct sockaddr_in6 sin;
  3842. int sinLength = sizeof(struct sockaddr_in6);
  3843. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3844. if (result == INVALID_SOCKET) {
  3845. ENET_LOG_ERROR("Tried to accept from an invalid socket");
  3846. return ENET_SOCKET_NULL;
  3847. }
  3848. if (address != NULL) {
  3849. address->ipv6 = sin.sin6_addr;
  3850. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3851. }
  3852. return result;
  3853. }
  3854. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3855. ENET_LOG_TRACE("Socket shutdown");
  3856. return shutdown(socket, (int)how) == SOCKET_ERROR ? -1 : 0;
  3857. }
  3858. void enet_socket_destroy(ENetSocket socket) {
  3859. if (socket != INVALID_SOCKET) {
  3860. ENET_LOG_TRACE("Socket destroyed");
  3861. closesocket(socket);
  3862. }
  3863. }
  3864. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3865. int lastError = 0;
  3866. struct sockaddr_in6 sin;
  3867. DWORD sentLength = 0;
  3868. if (address != NULL) {
  3869. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3870. sin.sin6_family = AF_INET6;
  3871. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3872. sin.sin6_addr = address->ipv6;
  3873. }
  3874. if (WSASendTo(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &sentLength, 0, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? sizeof(struct sockaddr_in6) : 0, NULL, NULL) == SOCKET_ERROR) {
  3875. lastError = WSAGetLastError();
  3876. if (lastError != WSAEWOULDBLOCK) {
  3877. // Error occurred and it wasn't a "This would block" response.
  3878. ENET_LOG_ERROR("WSASendTo reported an error, code returned was %i.", lastError);
  3879. return -1;
  3880. }
  3881. else {
  3882. return 0;
  3883. }
  3884. }
  3885. return (int)sentLength;
  3886. }
  3887. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3888. int lastError = 0;
  3889. INT sinLength = sizeof(struct sockaddr_in6);
  3890. DWORD flags = 0, recvLength = 0;
  3891. struct sockaddr_in6 sin;
  3892. if (WSARecvFrom(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &recvLength, &flags, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL, NULL, NULL) == SOCKET_ERROR) {
  3893. lastError = WSAGetLastError();
  3894. switch (lastError) {
  3895. case WSAEWOULDBLOCK:
  3896. case WSAECONNRESET:
  3897. return 0;
  3898. }
  3899. ENET_LOG_ERROR("Socket receive failure, WSA return code %i", lastError);
  3900. return -1;
  3901. }
  3902. if (flags & MSG_PARTIAL) {
  3903. ENET_LOG_ERROR("Partial socket receive message");
  3904. return -2;
  3905. }
  3906. if (address != NULL) {
  3907. address->ipv6 = sin.sin6_addr;
  3908. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3909. }
  3910. return (int)recvLength;
  3911. }
  3912. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, uint32_t timeout) {
  3913. struct timeval timeVal;
  3914. timeVal.tv_sec = timeout / 1000;
  3915. timeVal.tv_usec = (timeout % 1000) * 1000;
  3916. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3917. }
  3918. int enet_socket_wait(ENetSocket socket, uint32_t* condition, uint64_t timeout) {
  3919. fd_set readSet, writeSet;
  3920. struct timeval timeVal;
  3921. int selectCount;
  3922. timeVal.tv_sec = timeout / 1000;
  3923. timeVal.tv_usec = (timeout % 1000) * 1000;
  3924. FD_ZERO(&readSet);
  3925. FD_ZERO(&writeSet);
  3926. if (*condition & ENET_SOCKET_WAIT_SEND)
  3927. FD_SET(socket, &writeSet);
  3928. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3929. FD_SET(socket, &readSet);
  3930. selectCount = select(socket + 1, &readSet, &writeSet, NULL, &timeVal);
  3931. if (selectCount < 0) {
  3932. ENET_LOG_ERROR("Socket wait: selectCount < 0; was %i", selectCount);
  3933. return -1;
  3934. }
  3935. *condition = ENET_SOCKET_WAIT_NONE;
  3936. if (selectCount == 0)
  3937. return 0;
  3938. if (FD_ISSET(socket, &writeSet))
  3939. *condition |= ENET_SOCKET_WAIT_SEND;
  3940. if (FD_ISSET(socket, &readSet))
  3941. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3942. return 0;
  3943. }
  3944. #endif
  3945. /*
  3946. =======================================================================
  3947. Extended functionality
  3948. =======================================================================
  3949. */
  3950. void* enet_packet_get_data(const ENetPacket* packet) {
  3951. return (void*)packet->data;
  3952. }
  3953. void* enet_packet_get_user_data(const ENetPacket* packet) {
  3954. return packet->userData;
  3955. }
  3956. void enet_packet_set_user_data(ENetPacket* packet, void* userData) {
  3957. packet->userData = userData;
  3958. }
  3959. int enet_packet_get_length(const ENetPacket* packet) {
  3960. return packet->dataLength;
  3961. }
  3962. void enet_packet_set_free_callback(ENetPacket* packet, ENetPacketFreeCallback callback) {
  3963. packet->freeCallback = callback;
  3964. }
  3965. int enet_packet_check_references(const ENetPacket* packet) {
  3966. return (int)packet->referenceCount;
  3967. }
  3968. void enet_packet_dispose(ENetPacket* packet) {
  3969. if (packet->referenceCount == 0)
  3970. enet_packet_destroy(packet);
  3971. }
  3972. uint32_t enet_host_get_peers_count(const ENetHost* host) {
  3973. return host->connectedPeers;
  3974. }
  3975. uint32_t enet_host_get_packets_sent(const ENetHost* host) {
  3976. return host->totalSentPackets;
  3977. }
  3978. uint32_t enet_host_get_packets_received(const ENetHost* host) {
  3979. return host->totalReceivedPackets;
  3980. }
  3981. uint32_t enet_host_get_bytes_sent(const ENetHost* host) {
  3982. return host->totalSentData;
  3983. }
  3984. uint32_t enet_host_get_bytes_received(const ENetHost* host) {
  3985. return host->totalReceivedData;
  3986. }
  3987. void enet_host_set_max_duplicate_peers(ENetHost* host, uint16_t number) {
  3988. if (number < 1)
  3989. number = 1;
  3990. if (number > ENET_PROTOCOL_MAXIMUM_PEER_ID)
  3991. number = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  3992. host->duplicatePeers = number;
  3993. }
  3994. void enet_host_set_intercept_callback(ENetHost* host, ENetInterceptCallback callback) {
  3995. host->interceptCallback = callback;
  3996. }
  3997. void enet_host_set_checksum_callback(ENetHost* host, ENetChecksumCallback callback) {
  3998. host->checksumCallback = callback;
  3999. }
  4000. uint32_t enet_peer_get_id(const ENetPeer* peer) {
  4001. return peer->incomingPeerID;
  4002. }
  4003. int enet_peer_get_ip(const ENetPeer* peer, char* ip, size_t ipLength) {
  4004. return enet_address_get_ip(&peer->address, ip, ipLength);
  4005. }
  4006. uint16_t enet_peer_get_port(const ENetPeer* peer) {
  4007. return peer->address.port;
  4008. }
  4009. uint32_t enet_peer_get_mtu(const ENetPeer* peer) {
  4010. return peer->mtu;
  4011. }
  4012. ENetPeerState enet_peer_get_state(const ENetPeer* peer) {
  4013. return peer->state;
  4014. }
  4015. uint32_t enet_peer_get_rtt(const ENetPeer* peer) {
  4016. return peer->roundTripTime;
  4017. }
  4018. uint32_t enet_peer_get_last_rtt(const ENetPeer* peer) {
  4019. return peer->lastRoundTripTime;
  4020. }
  4021. uint32_t enet_peer_get_lastsendtime(const ENetPeer* peer) {
  4022. return peer->lastSendTime;
  4023. }
  4024. uint32_t enet_peer_get_lastreceivetime(const ENetPeer* peer) {
  4025. return peer->lastReceiveTime;
  4026. }
  4027. uint64_t enet_peer_get_packets_sent(const ENetPeer* peer) {
  4028. return peer->totalPacketsSent;
  4029. }
  4030. uint64_t enet_peer_get_packets_lost(const ENetPeer* peer) {
  4031. return peer->totalPacketsLost;
  4032. }
  4033. float enet_peer_get_packets_throttle(const ENetPeer* peer) {
  4034. return peer->packetThrottle / (float)ENET_PEER_PACKET_THROTTLE_SCALE * 100.0f;
  4035. }
  4036. uint64_t enet_peer_get_bytes_sent(const ENetPeer* peer) {
  4037. return peer->totalDataSent;
  4038. }
  4039. uint64_t enet_peer_get_bytes_received(const ENetPeer* peer) {
  4040. return peer->totalDataReceived;
  4041. }
  4042. void* enet_peer_get_data(const ENetPeer* peer) {
  4043. return (void*)peer->data;
  4044. }
  4045. void enet_peer_set_data(ENetPeer* peer, const void* data) {
  4046. peer->data = (uint32_t*)data;
  4047. }
  4048. #ifdef _MSC_VER
  4049. #pragma warning(pop)
  4050. #endif
  4051. #endif // ENET_IMPLEMENTATION
  4052. #endif // ENET_H