enet.h 178 KB

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  1. /*
  2. * ENet reliable UDP networking library
  3. * Copyright (c) 2018 Lee Salzman, Vladyslav Hrytsenko, Dominik Madarász, Stanislav Denisov
  4. *
  5. * Permission is hereby granted, free of charge, to any person obtaining a copy
  6. * of this software and associated documentation files (the "Software"), to deal
  7. * in the Software without restriction, including without limitation the rights
  8. * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  9. * copies of the Software, and to permit persons to whom the Software is
  10. * furnished to do so, subject to the following conditions:
  11. *
  12. * The above copyright notice and this permission notice shall be included in all
  13. * copies or substantial portions of the Software.
  14. *
  15. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18. * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21. * SOFTWARE.
  22. */
  23. #ifndef ENET_H
  24. #define ENET_H
  25. #include <stdlib.h>
  26. #include <stdbool.h>
  27. #include <stdint.h>
  28. #include <time.h>
  29. #define ENET_VERSION_MAJOR 2
  30. #define ENET_VERSION_MINOR 5
  31. #define ENET_VERSION_PATCH 0
  32. #define ENET_VERSION_CREATE(major, minor, patch) (((major) << 16) | ((minor) << 8) | (patch))
  33. #define ENET_VERSION_GET_MAJOR(version) (((version) >> 16) & 0xFF)
  34. #define ENET_VERSION_GET_MINOR(version) (((version) >> 8) & 0xFF)
  35. #define ENET_VERSION_GET_PATCH(version) ((version) & 0xFF)
  36. #define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH)
  37. #define ENET_TIME_OVERFLOW 86400000
  38. #define ENET_TIME_LESS(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW)
  39. #define ENET_TIME_GREATER(a, b) ((b) - (a) >= ENET_TIME_OVERFLOW)
  40. #define ENET_TIME_LESS_EQUAL(a, b) (!ENET_TIME_GREATER(a, b))
  41. #define ENET_TIME_GREATER_EQUAL(a, b) (!ENET_TIME_LESS(a, b))
  42. #define ENET_TIME_DIFFERENCE(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW ? (b) - (a) : (a) - (b))
  43. #define ENET_MAX(x, y) ((x) > (y) ? (x) : (y))
  44. #define ENET_MIN(x, y) ((x) < (y) ? (x) : (y))
  45. /*
  46. =======================================================================
  47. System differences
  48. =======================================================================
  49. */
  50. #ifdef _WIN32
  51. #ifndef ENET_NO_PRAGMA_LINK
  52. #pragma comment(lib, "ws2_32.lib")
  53. #pragma comment(lib, "winmm.lib")
  54. #endif
  55. #if _MSC_VER >= 1910
  56. /* It looks like there were changes as of Visual Studio 2017 and there are no 32/64 bit
  57. versions of _InterlockedExchange[operation], only InterlockedExchange[operation]
  58. (without leading underscore), so we have to distinguish between compiler versions */
  59. #define ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  60. #endif
  61. #ifdef ENET_EXCLUDE_WINDOWS_H
  62. #define _INC_WINDOWS // Prevent the inclusion of the "windows.h" header
  63. #include <windef.h>
  64. #include <minwinbase.h>
  65. #include <timezoneapi.h>
  66. #include <profileapi.h>
  67. #include <sysinfoapi.h>
  68. #else
  69. #define WIN32_LEAN_AND_MEAN
  70. #endif
  71. #include <winsock2.h>
  72. #include <ws2tcpip.h>
  73. #include <mmsystem.h>
  74. #include <intrin.h>
  75. #if defined(_WIN32) && defined(_MSC_VER)
  76. #if _MSC_VER < 1900
  77. typedef struct timespec {
  78. long tv_sec;
  79. long tv_nsec;
  80. };
  81. #endif
  82. #define CLOCK_MONOTONIC 0
  83. #endif
  84. typedef SOCKET ENetSocket;
  85. #define ENET_SOCKET_NULL INVALID_SOCKET
  86. typedef struct {
  87. size_t dataLength;
  88. void* data;
  89. } ENetBuffer;
  90. #define ENET_CALLBACK __cdecl
  91. #ifdef ENET_DLL
  92. #ifdef ENET_IMPLEMENTATION
  93. #define ENET_API __declspec(dllexport)
  94. #else
  95. #define ENET_API __declspec(dllimport)
  96. #endif
  97. #else
  98. #define ENET_API extern
  99. #endif
  100. #else
  101. #include <sys/types.h>
  102. #include <sys/ioctl.h>
  103. #include <sys/time.h>
  104. #include <sys/socket.h>
  105. #include <poll.h>
  106. #include <arpa/inet.h>
  107. #include <netinet/in.h>
  108. #include <netinet/tcp.h>
  109. #include <netdb.h>
  110. #include <unistd.h>
  111. #include <string.h>
  112. #include <errno.h>
  113. #include <fcntl.h>
  114. #ifdef __APPLE__
  115. #include <mach/clock.h>
  116. #include <mach/mach.h>
  117. #include <Availability.h>
  118. #endif
  119. #ifndef MSG_NOSIGNAL
  120. #define MSG_NOSIGNAL 0
  121. #endif
  122. #ifdef MSG_MAXIOVLEN
  123. #define ENET_BUFFER_MAXIMUM MSG_MAXIOVLEN
  124. #endif
  125. typedef int ENetSocket;
  126. #define ENET_SOCKET_NULL -1
  127. typedef struct {
  128. void* data;
  129. size_t dataLength;
  130. } ENetBuffer;
  131. #define ENET_CALLBACK
  132. #define ENET_API extern
  133. #endif
  134. #ifndef ENET_BUFFER_MAXIMUM
  135. #define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS)
  136. #endif
  137. #define ENET_HOST_ANY in6addr_any
  138. #define ENET_PORT_ANY 0
  139. #define ENET_HOST_SIZE 1025
  140. #define ENET_HOST_TO_NET_16(value) (htons(value))
  141. #define ENET_HOST_TO_NET_32(value) (htonl(value))
  142. #define ENET_NET_TO_HOST_16(value) (ntohs(value))
  143. #define ENET_NET_TO_HOST_32(value) (ntohl(value))
  144. #if __BIG_ENDIAN__
  145. #define ENET_HOST_TO_NET_64(x) (x)
  146. #define ENET_NET_TO_HOST_64(x) (x)
  147. #else
  148. #define ENET_HOST_TO_NET_64(x) (((uint64_t)htonl((x) & 0xFFFFFFFF) << 32) | htonl((x) >> 32))
  149. #define ENET_NET_TO_HOST_64(x) (((uint64_t)ntohl((x) & 0xFFFFFFFF) << 32) | ntohl((x) >> 32))
  150. #endif
  151. #ifdef __cplusplus
  152. extern "C" {
  153. #endif
  154. /*
  155. =======================================================================
  156. Internals
  157. =======================================================================
  158. */
  159. typedef uint32_t ENetVersion;
  160. typedef fd_set ENetSocketSet;
  161. typedef struct _ENetCallbacks {
  162. void* (ENET_CALLBACK *malloc)(size_t size);
  163. void (ENET_CALLBACK *free)(void* memory);
  164. void (ENET_CALLBACK *noMemory)(void);
  165. } ENetCallbacks;
  166. extern void* enet_malloc(size_t);
  167. extern void enet_free(void*);
  168. typedef struct _ENetListNode {
  169. struct _ENetListNode* next;
  170. struct _ENetListNode* previous;
  171. } ENetListNode;
  172. typedef ENetListNode* ENetListIterator;
  173. typedef struct _ENetList {
  174. ENetListNode sentinel;
  175. } ENetList;
  176. extern ENetListIterator enet_list_insert(ENetListIterator, void*);
  177. extern ENetListIterator enet_list_move(ENetListIterator, void*, void*);
  178. extern void* enet_list_remove(ENetListIterator);
  179. extern void enet_list_clear(ENetList*);
  180. extern size_t enet_list_size(ENetList*);
  181. #define enet_list_begin(list) ((list)->sentinel.next)
  182. #define enet_list_end(list) (&(list)->sentinel)
  183. #define enet_list_empty(list) (enet_list_begin(list) == enet_list_end(list))
  184. #define enet_list_next(iterator) ((iterator)->next)
  185. #define enet_list_previous(iterator) ((iterator)->previous)
  186. #define enet_list_front(list) ((void*)(list)->sentinel.next)
  187. #define enet_list_back(list) ((void*)(list)->sentinel.previous)
  188. #define enet_in6_equal(a, b) (memcmp(&a, &b, sizeof(struct in6_addr)) == 0)
  189. /*
  190. =======================================================================
  191. Protocol
  192. =======================================================================
  193. */
  194. enum {
  195. ENET_PROTOCOL_MINIMUM_MTU = 576,
  196. ENET_PROTOCOL_MAXIMUM_MTU = 4096,
  197. ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS = 32,
  198. ENET_PROTOCOL_MINIMUM_WINDOW_SIZE = 4096,
  199. ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE = 65536,
  200. ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT = 1,
  201. ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT = 255,
  202. ENET_PROTOCOL_MAXIMUM_PEER_ID = 0xFFF,
  203. ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT = 1024 * 1024
  204. };
  205. typedef enum _ENetProtocolCommand {
  206. ENET_PROTOCOL_COMMAND_NONE = 0,
  207. ENET_PROTOCOL_COMMAND_ACKNOWLEDGE = 1,
  208. ENET_PROTOCOL_COMMAND_CONNECT = 2,
  209. ENET_PROTOCOL_COMMAND_VERIFY_CONNECT = 3,
  210. ENET_PROTOCOL_COMMAND_DISCONNECT = 4,
  211. ENET_PROTOCOL_COMMAND_PING = 5,
  212. ENET_PROTOCOL_COMMAND_SEND_RELIABLE = 6,
  213. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE = 7,
  214. ENET_PROTOCOL_COMMAND_SEND_FRAGMENT = 8,
  215. ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED = 9,
  216. ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT = 10,
  217. ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE = 11,
  218. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT = 12,
  219. ENET_PROTOCOL_COMMAND_COUNT = 13,
  220. ENET_PROTOCOL_COMMAND_MASK = 0x0F
  221. } ENetProtocolCommand;
  222. typedef enum _ENetProtocolFlag {
  223. ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE = (1 << 7),
  224. ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED = (1 << 6),
  225. ENET_PROTOCOL_HEADER_FLAG_SENT_TIME = (1 << 14),
  226. ENET_PROTOCOL_HEADER_FLAG_MASK = ENET_PROTOCOL_HEADER_FLAG_SENT_TIME,
  227. ENET_PROTOCOL_HEADER_SESSION_MASK = (3 << 12),
  228. ENET_PROTOCOL_HEADER_SESSION_SHIFT = 12
  229. } ENetProtocolFlag;
  230. #ifdef _MSC_VER
  231. #pragma pack(push, 1)
  232. #define ENET_PACKED
  233. #elif defined(__GNUC__) || defined(__clang__)
  234. #define ENET_PACKED __attribute__ ((packed))
  235. #else
  236. #define ENET_PACKED
  237. #endif
  238. typedef struct _ENetProtocolHeader {
  239. uint16_t peerID;
  240. uint16_t sentTime;
  241. } ENET_PACKED ENetProtocolHeader;
  242. typedef struct _ENetProtocolCommandHeader {
  243. uint8_t command;
  244. uint8_t channelID;
  245. uint16_t reliableSequenceNumber;
  246. } ENET_PACKED ENetProtocolCommandHeader;
  247. typedef struct _ENetProtocolAcknowledge {
  248. ENetProtocolCommandHeader header;
  249. uint16_t receivedReliableSequenceNumber;
  250. uint16_t receivedSentTime;
  251. } ENET_PACKED ENetProtocolAcknowledge;
  252. typedef struct _ENetProtocolConnect {
  253. ENetProtocolCommandHeader header;
  254. uint16_t outgoingPeerID;
  255. uint8_t incomingSessionID;
  256. uint8_t outgoingSessionID;
  257. uint32_t mtu;
  258. uint32_t windowSize;
  259. uint32_t channelCount;
  260. uint32_t incomingBandwidth;
  261. uint32_t outgoingBandwidth;
  262. uint32_t packetThrottleInterval;
  263. uint32_t packetThrottleAcceleration;
  264. uint32_t packetThrottleDeceleration;
  265. uint32_t connectID;
  266. uint32_t data;
  267. } ENET_PACKED ENetProtocolConnect;
  268. typedef struct _ENetProtocolVerifyConnect {
  269. ENetProtocolCommandHeader header;
  270. uint16_t outgoingPeerID;
  271. uint8_t incomingSessionID;
  272. uint8_t outgoingSessionID;
  273. uint32_t mtu;
  274. uint32_t windowSize;
  275. uint32_t channelCount;
  276. uint32_t incomingBandwidth;
  277. uint32_t outgoingBandwidth;
  278. uint32_t packetThrottleInterval;
  279. uint32_t packetThrottleAcceleration;
  280. uint32_t packetThrottleDeceleration;
  281. uint32_t connectID;
  282. } ENET_PACKED ENetProtocolVerifyConnect;
  283. typedef struct _ENetProtocolBandwidthLimit {
  284. ENetProtocolCommandHeader header;
  285. uint32_t incomingBandwidth;
  286. uint32_t outgoingBandwidth;
  287. } ENET_PACKED ENetProtocolBandwidthLimit;
  288. typedef struct _ENetProtocolThrottleConfigure {
  289. ENetProtocolCommandHeader header;
  290. uint32_t packetThrottleInterval;
  291. uint32_t packetThrottleAcceleration;
  292. uint32_t packetThrottleDeceleration;
  293. } ENET_PACKED ENetProtocolThrottleConfigure;
  294. typedef struct _ENetProtocolDisconnect {
  295. ENetProtocolCommandHeader header;
  296. uint32_t data;
  297. } ENET_PACKED ENetProtocolDisconnect;
  298. typedef struct _ENetProtocolPing {
  299. ENetProtocolCommandHeader header;
  300. } ENET_PACKED ENetProtocolPing;
  301. typedef struct _ENetProtocolSendReliable {
  302. ENetProtocolCommandHeader header;
  303. uint16_t dataLength;
  304. } ENET_PACKED ENetProtocolSendReliable;
  305. typedef struct _ENetProtocolSendUnreliable {
  306. ENetProtocolCommandHeader header;
  307. uint16_t unreliableSequenceNumber;
  308. uint16_t dataLength;
  309. } ENET_PACKED ENetProtocolSendUnreliable;
  310. typedef struct _ENetProtocolSendUnsequenced {
  311. ENetProtocolCommandHeader header;
  312. uint16_t unsequencedGroup;
  313. uint16_t dataLength;
  314. } ENET_PACKED ENetProtocolSendUnsequenced;
  315. typedef struct _ENetProtocolSendFragment {
  316. ENetProtocolCommandHeader header;
  317. uint16_t startSequenceNumber;
  318. uint16_t dataLength;
  319. uint32_t fragmentCount;
  320. uint32_t fragmentNumber;
  321. uint32_t totalLength;
  322. uint32_t fragmentOffset;
  323. } ENET_PACKED ENetProtocolSendFragment;
  324. typedef union _ENetProtocol {
  325. ENetProtocolCommandHeader header;
  326. ENetProtocolAcknowledge acknowledge;
  327. ENetProtocolConnect connect;
  328. ENetProtocolVerifyConnect verifyConnect;
  329. ENetProtocolDisconnect disconnect;
  330. ENetProtocolPing ping;
  331. ENetProtocolSendReliable sendReliable;
  332. ENetProtocolSendUnreliable sendUnreliable;
  333. ENetProtocolSendUnsequenced sendUnsequenced;
  334. ENetProtocolSendFragment sendFragment;
  335. ENetProtocolBandwidthLimit bandwidthLimit;
  336. ENetProtocolThrottleConfigure throttleConfigure;
  337. } ENET_PACKED ENetProtocol;
  338. #ifdef _MSC_VER
  339. #pragma pack(pop)
  340. #endif
  341. /*
  342. =======================================================================
  343. General structs/enums
  344. =======================================================================
  345. */
  346. typedef enum _ENetSocketType {
  347. ENET_SOCKET_TYPE_STREAM = 1,
  348. ENET_SOCKET_TYPE_DATAGRAM = 2
  349. } ENetSocketType;
  350. typedef enum _ENetSocketWait {
  351. ENET_SOCKET_WAIT_NONE = 0,
  352. ENET_SOCKET_WAIT_SEND = (1 << 0),
  353. ENET_SOCKET_WAIT_RECEIVE = (1 << 1),
  354. ENET_SOCKET_WAIT_INTERRUPT = (1 << 2)
  355. } ENetSocketWait;
  356. typedef enum _ENetSocketOption {
  357. ENET_SOCKOPT_NONBLOCK = 1,
  358. ENET_SOCKOPT_BROADCAST = 2,
  359. ENET_SOCKOPT_RCVBUF = 3,
  360. ENET_SOCKOPT_SNDBUF = 4,
  361. ENET_SOCKOPT_REUSEADDR = 5,
  362. ENET_SOCKOPT_RCVTIMEO = 6,
  363. ENET_SOCKOPT_SNDTIMEO = 7,
  364. ENET_SOCKOPT_ERROR = 8,
  365. ENET_SOCKOPT_NODELAY = 9,
  366. ENET_SOCKOPT_IPV6_V6ONLY = 10,
  367. ENET_SOCKOPT_TTL = 11
  368. } ENetSocketOption;
  369. typedef enum _ENetSocketShutdown {
  370. ENET_SOCKET_SHUTDOWN_READ = 0,
  371. ENET_SOCKET_SHUTDOWN_WRITE = 1,
  372. ENET_SOCKET_SHUTDOWN_READ_WRITE = 2
  373. } ENetSocketShutdown;
  374. typedef struct _ENetAddress {
  375. union {
  376. struct in6_addr ipv6;
  377. struct {
  378. uint8_t zeros[10];
  379. uint16_t ffff;
  380. struct in_addr ip;
  381. } ipv4;
  382. };
  383. uint16_t port;
  384. } ENetAddress;
  385. typedef enum _ENetPacketFlag {
  386. ENET_PACKET_FLAG_NONE = 0,
  387. ENET_PACKET_FLAG_RELIABLE = (1 << 0),
  388. ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1),
  389. ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2),
  390. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED = (1 << 3),
  391. ENET_PACKET_FLAG_INSTANT = (1 << 4),
  392. ENET_PACKET_FLAG_UNTHROTTLED = (1 << 5),
  393. ENET_PACKET_FLAG_SENT = (1 << 8)
  394. } ENetPacketFlag;
  395. typedef void (ENET_CALLBACK *ENetPacketFreeCallback)(void*);
  396. typedef struct _ENetPacket {
  397. uint32_t flags;
  398. uint32_t dataLength;
  399. uint8_t* data;
  400. ENetPacketFreeCallback freeCallback;
  401. uint32_t referenceCount;
  402. void* userData;
  403. } ENetPacket;
  404. typedef struct _ENetAcknowledgement {
  405. ENetListNode acknowledgementList;
  406. uint32_t sentTime;
  407. ENetProtocol command;
  408. } ENetAcknowledgement;
  409. typedef struct _ENetOutgoingCommand {
  410. ENetListNode outgoingCommandList;
  411. uint16_t reliableSequenceNumber;
  412. uint16_t unreliableSequenceNumber;
  413. uint32_t sentTime;
  414. uint32_t roundTripTimeout;
  415. uint32_t queueTime;
  416. uint32_t fragmentOffset;
  417. uint16_t fragmentLength;
  418. uint16_t sendAttempts;
  419. ENetProtocol command;
  420. ENetPacket* packet;
  421. } ENetOutgoingCommand;
  422. typedef struct _ENetIncomingCommand {
  423. ENetListNode incomingCommandList;
  424. uint16_t reliableSequenceNumber;
  425. uint16_t unreliableSequenceNumber;
  426. ENetProtocol command;
  427. uint32_t fragmentCount;
  428. uint32_t fragmentsRemaining;
  429. uint32_t* fragments;
  430. ENetPacket* packet;
  431. } ENetIncomingCommand;
  432. typedef enum _ENetPeerState {
  433. ENET_PEER_STATE_DISCONNECTED = 0,
  434. ENET_PEER_STATE_CONNECTING = 1,
  435. ENET_PEER_STATE_ACKNOWLEDGING_CONNECT = 2,
  436. ENET_PEER_STATE_CONNECTION_PENDING = 3,
  437. ENET_PEER_STATE_CONNECTION_SUCCEEDED = 4,
  438. ENET_PEER_STATE_CONNECTED = 5,
  439. ENET_PEER_STATE_DISCONNECT_LATER = 6,
  440. ENET_PEER_STATE_DISCONNECTING = 7,
  441. ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT = 8,
  442. ENET_PEER_STATE_ZOMBIE = 9
  443. } ENetPeerState;
  444. enum {
  445. ENET_HOST_BUFFER_SIZE_MIN = 256 * 1024,
  446. ENET_HOST_BUFFER_SIZE_MAX = 1024 * 1024,
  447. ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000,
  448. ENET_HOST_DEFAULT_MTU = 1280,
  449. ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024,
  450. ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
  451. ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 1,
  452. ENET_PEER_DEFAULT_PACKET_THROTTLE = 32,
  453. ENET_PEER_PACKET_THROTTLE_THRESHOLD = 40,
  454. ENET_PEER_PACKET_THROTTLE_SCALE = 32,
  455. ENET_PEER_PACKET_THROTTLE_COUNTER = 7,
  456. ENET_PEER_PACKET_THROTTLE_ACCELERATION = 2,
  457. ENET_PEER_PACKET_THROTTLE_DECELERATION = 2,
  458. ENET_PEER_PACKET_THROTTLE_INTERVAL = 5000,
  459. ENET_PEER_WINDOW_SIZE_SCALE = 64 * 1024,
  460. ENET_PEER_TIMEOUT_LIMIT = 32,
  461. ENET_PEER_TIMEOUT_MINIMUM = 5000,
  462. ENET_PEER_TIMEOUT_MAXIMUM = 30000,
  463. ENET_PEER_PING_INTERVAL = 250,
  464. ENET_PEER_UNSEQUENCED_WINDOWS = 64,
  465. ENET_PEER_UNSEQUENCED_WINDOW_SIZE = 1024,
  466. ENET_PEER_FREE_UNSEQUENCED_WINDOWS = 32,
  467. ENET_PEER_RELIABLE_WINDOWS = 16,
  468. ENET_PEER_RELIABLE_WINDOW_SIZE = 0x1000,
  469. ENET_PEER_FREE_RELIABLE_WINDOWS = 8
  470. };
  471. typedef struct _ENetChannel {
  472. uint16_t outgoingReliableSequenceNumber;
  473. uint16_t outgoingUnreliableSequenceNumber;
  474. uint16_t usedReliableWindows;
  475. uint16_t reliableWindows[ENET_PEER_RELIABLE_WINDOWS];
  476. uint16_t incomingReliableSequenceNumber;
  477. uint16_t incomingUnreliableSequenceNumber;
  478. ENetList incomingReliableCommands;
  479. ENetList incomingUnreliableCommands;
  480. } ENetChannel;
  481. typedef struct _ENetPeer {
  482. ENetListNode dispatchList;
  483. struct _ENetHost* host;
  484. uint16_t outgoingPeerID;
  485. uint16_t incomingPeerID;
  486. uint32_t connectID;
  487. uint8_t outgoingSessionID;
  488. uint8_t incomingSessionID;
  489. ENetAddress address;
  490. void* data;
  491. ENetPeerState state;
  492. ENetChannel* channels;
  493. size_t channelCount;
  494. uint32_t incomingBandwidth;
  495. uint32_t outgoingBandwidth;
  496. uint32_t incomingBandwidthThrottleEpoch;
  497. uint32_t outgoingBandwidthThrottleEpoch;
  498. uint32_t incomingDataTotal;
  499. uint64_t totalDataReceived;
  500. uint32_t outgoingDataTotal;
  501. uint64_t totalDataSent;
  502. uint32_t lastSendTime;
  503. uint32_t lastReceiveTime;
  504. uint32_t nextTimeout;
  505. uint32_t earliestTimeout;
  506. uint64_t totalPacketsSent;
  507. uint64_t totalPacketsLost;
  508. uint32_t packetThrottle;
  509. uint32_t packetThrottleThreshold;
  510. uint32_t packetThrottleLimit;
  511. uint32_t packetThrottleCounter;
  512. uint32_t packetThrottleEpoch;
  513. uint32_t packetThrottleAcceleration;
  514. uint32_t packetThrottleDeceleration;
  515. uint32_t packetThrottleInterval;
  516. uint32_t pingInterval;
  517. uint32_t timeoutLimit;
  518. uint32_t timeoutMinimum;
  519. uint32_t timeoutMaximum;
  520. uint32_t lastRoundTripTime;
  521. uint32_t lowestRoundTripTime;
  522. uint32_t lastRoundTripTimeVariance;
  523. uint32_t highestRoundTripTimeVariance;
  524. uint32_t roundTripTime;
  525. uint32_t roundTripTimeVariance;
  526. uint32_t mtu;
  527. uint32_t windowSize;
  528. uint32_t reliableDataInTransit;
  529. uint16_t outgoingReliableSequenceNumber;
  530. ENetList acknowledgements;
  531. ENetList sentReliableCommands;
  532. ENetList outgoingSendReliableCommands;
  533. ENetList outgoingCommands;
  534. ENetList dispatchedCommands;
  535. int needsDispatch;
  536. int continueSending;
  537. uint16_t incomingUnsequencedGroup;
  538. uint16_t outgoingUnsequencedGroup;
  539. uint32_t unsequencedWindow[ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32];
  540. uint32_t eventData;
  541. size_t totalWaitingData;
  542. } ENetPeer;
  543. typedef enum _ENetEventType {
  544. ENET_EVENT_TYPE_NONE = 0,
  545. ENET_EVENT_TYPE_CONNECT = 1,
  546. ENET_EVENT_TYPE_DISCONNECT = 2,
  547. ENET_EVENT_TYPE_RECEIVE = 3,
  548. ENET_EVENT_TYPE_DISCONNECT_TIMEOUT = 4
  549. } ENetEventType;
  550. typedef struct _ENetEvent {
  551. ENetEventType type;
  552. ENetPeer* peer;
  553. uint8_t channelID;
  554. uint32_t data;
  555. ENetPacket* packet;
  556. } ENetEvent;
  557. typedef uint64_t (ENET_CALLBACK *ENetChecksumCallback)(const ENetBuffer* buffers, int bufferCount);
  558. typedef int (ENET_CALLBACK *ENetInterceptCallback)(ENetEvent* event, ENetAddress* address, uint8_t* receivedData, int receivedDataLength);
  559. typedef struct _ENetHost {
  560. ENetSocket socket;
  561. ENetAddress address;
  562. uint32_t incomingBandwidth;
  563. uint32_t outgoingBandwidth;
  564. uint32_t bandwidthThrottleEpoch;
  565. uint32_t mtu;
  566. uint32_t randomSeed;
  567. int recalculateBandwidthLimits;
  568. uint8_t preventConnections;
  569. ENetPeer* peers;
  570. size_t peerCount;
  571. size_t channelLimit;
  572. uint32_t serviceTime;
  573. ENetList dispatchQueue;
  574. uint32_t totalQueued;
  575. size_t packetSize;
  576. uint16_t headerFlags;
  577. uint32_t totalSentData;
  578. uint32_t totalSentPackets;
  579. uint32_t totalReceivedData;
  580. uint32_t totalReceivedPackets;
  581. ENetProtocol commands[ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
  582. size_t commandCount;
  583. ENetBuffer buffers[ENET_BUFFER_MAXIMUM];
  584. size_t bufferCount;
  585. ENetChecksumCallback checksumCallback;
  586. uint8_t packetData[2][ENET_PROTOCOL_MAXIMUM_MTU];
  587. ENetAddress receivedAddress;
  588. uint8_t* receivedData;
  589. size_t receivedDataLength;
  590. ENetInterceptCallback interceptCallback;
  591. size_t connectedPeers;
  592. size_t bandwidthLimitedPeers;
  593. size_t duplicatePeers;
  594. size_t maximumPacketSize;
  595. size_t maximumWaitingData;
  596. } ENetHost;
  597. /*
  598. =======================================================================
  599. Public API
  600. =======================================================================
  601. */
  602. ENET_API int enet_initialize(void);
  603. ENET_API int enet_initialize_with_callbacks(ENetVersion, const ENetCallbacks*);
  604. ENET_API void enet_deinitialize(void);
  605. ENET_API ENetVersion enet_linked_version(void);
  606. ENET_API int enet_array_is_zeroed(const uint8_t*, int);
  607. ENET_API uint32_t enet_time_get(void);
  608. ENET_API uint64_t enet_crc64(const ENetBuffer*, int);
  609. ENET_API ENetPacket* enet_packet_create(const void*, size_t, uint32_t);
  610. ENET_API ENetPacket* enet_packet_create_offset(const void*, size_t, size_t, uint32_t);
  611. ENET_API void enet_packet_destroy(ENetPacket*);
  612. ENET_API int enet_peer_send(ENetPeer*, uint8_t, ENetPacket*);
  613. ENET_API ENetPacket* enet_peer_receive(ENetPeer*, uint8_t*);
  614. ENET_API void enet_peer_ping(ENetPeer*);
  615. ENET_API void enet_peer_ping_interval(ENetPeer*, uint32_t);
  616. ENET_API void enet_peer_timeout(ENetPeer*, uint32_t, uint32_t, uint32_t);
  617. ENET_API void enet_peer_reset(ENetPeer*);
  618. ENET_API void enet_peer_disconnect(ENetPeer*, uint32_t);
  619. ENET_API void enet_peer_disconnect_now(ENetPeer*, uint32_t);
  620. ENET_API void enet_peer_disconnect_later(ENetPeer*, uint32_t);
  621. ENET_API void enet_peer_throttle_configure(ENetPeer*, uint32_t, uint32_t, uint32_t, uint32_t);
  622. ENET_API ENetHost* enet_host_create(const ENetAddress*, size_t, size_t, uint32_t, uint32_t, int);
  623. ENET_API void enet_host_destroy(ENetHost*);
  624. ENET_API void enet_host_prevent_connections(ENetHost*, uint8_t);
  625. ENET_API ENetPeer* enet_host_connect(ENetHost*, const ENetAddress*, size_t, uint32_t);
  626. ENET_API int enet_host_check_events(ENetHost*, ENetEvent*);
  627. ENET_API int enet_host_service(ENetHost*, ENetEvent*, uint32_t);
  628. ENET_API void enet_host_flush(ENetHost*);
  629. ENET_API void enet_host_broadcast(ENetHost*, uint8_t, ENetPacket*);
  630. ENET_API void enet_host_broadcast_exclude(ENetHost*, uint8_t, ENetPacket*, ENetPeer*);
  631. ENET_API void enet_host_broadcast_selective(ENetHost*, uint8_t, ENetPacket*, ENetPeer**, size_t);
  632. ENET_API void enet_host_channel_limit(ENetHost*, size_t);
  633. ENET_API void enet_host_bandwidth_limit(ENetHost*, uint32_t, uint32_t);
  634. ENET_API int enet_address_set_ip(ENetAddress*, const char*);
  635. ENET_API int enet_address_set_hostname(ENetAddress*, const char*);
  636. ENET_API int enet_address_get_ip(const ENetAddress*, char*, size_t);
  637. ENET_API int enet_address_get_hostname(const ENetAddress*, char*, size_t);
  638. ENET_API ENetSocket enet_socket_create(ENetSocketType);
  639. ENET_API int enet_socket_bind(ENetSocket, const ENetAddress*);
  640. ENET_API int enet_socket_get_address(ENetSocket, ENetAddress*);
  641. ENET_API int enet_socket_listen(ENetSocket, int);
  642. ENET_API ENetSocket enet_socket_accept(ENetSocket, ENetAddress*);
  643. ENET_API int enet_socket_connect(ENetSocket, const ENetAddress*);
  644. ENET_API int enet_socket_send(ENetSocket, const ENetAddress*, const ENetBuffer*, size_t);
  645. ENET_API int enet_socket_receive(ENetSocket, ENetAddress*, ENetBuffer*, size_t);
  646. ENET_API int enet_socket_wait(ENetSocket, uint32_t*, uint64_t);
  647. ENET_API int enet_socket_set_option(ENetSocket, ENetSocketOption, int);
  648. ENET_API int enet_socket_get_option(ENetSocket, ENetSocketOption, int*);
  649. ENET_API int enet_socket_shutdown(ENetSocket, ENetSocketShutdown);
  650. ENET_API void enet_socket_destroy(ENetSocket);
  651. ENET_API int enet_socket_set_select(ENetSocket, ENetSocketSet*, ENetSocketSet*, uint32_t);
  652. /* Extended API for easier binding in other programming languages */
  653. ENET_API void* enet_packet_get_data(const ENetPacket*);
  654. ENET_API void* enet_packet_get_user_data(const ENetPacket*);
  655. ENET_API void enet_packet_set_user_data(ENetPacket*, void* userData);
  656. ENET_API int enet_packet_get_length(const ENetPacket*);
  657. ENET_API void enet_packet_set_free_callback(ENetPacket*, ENetPacketFreeCallback);
  658. ENET_API int enet_packet_check_references(const ENetPacket*);
  659. ENET_API void enet_packet_dispose(ENetPacket*);
  660. ENET_API uint32_t enet_host_get_peers_count(const ENetHost*);
  661. ENET_API uint32_t enet_host_get_packets_sent(const ENetHost*);
  662. ENET_API uint32_t enet_host_get_packets_received(const ENetHost*);
  663. ENET_API uint32_t enet_host_get_bytes_sent(const ENetHost*);
  664. ENET_API uint32_t enet_host_get_bytes_received(const ENetHost*);
  665. ENET_API void enet_host_set_max_duplicate_peers(ENetHost*, uint16_t);
  666. ENET_API void enet_host_set_intercept_callback(ENetHost*, ENetInterceptCallback);
  667. ENET_API void enet_host_set_checksum_callback(ENetHost*, ENetChecksumCallback);
  668. ENET_API uint32_t enet_peer_get_id(const ENetPeer*);
  669. ENET_API int enet_peer_get_ip(const ENetPeer*, char*, size_t);
  670. ENET_API uint16_t enet_peer_get_port(const ENetPeer*);
  671. ENET_API uint32_t enet_peer_get_mtu(const ENetPeer*);
  672. ENET_API ENetPeerState enet_peer_get_state(const ENetPeer*);
  673. ENET_API uint32_t enet_peer_get_rtt(const ENetPeer*);
  674. ENET_API uint32_t enet_peer_get_last_rtt(const ENetPeer* peer);
  675. ENET_API uint32_t enet_peer_get_lastsendtime(const ENetPeer*);
  676. ENET_API uint32_t enet_peer_get_lastreceivetime(const ENetPeer*);
  677. ENET_API uint64_t enet_peer_get_packets_sent(const ENetPeer*);
  678. ENET_API uint64_t enet_peer_get_packets_lost(const ENetPeer*);
  679. ENET_API float enet_peer_get_packets_throttle(const ENetPeer*);
  680. ENET_API uint64_t enet_peer_get_bytes_sent(const ENetPeer*);
  681. ENET_API uint64_t enet_peer_get_bytes_received(const ENetPeer*);
  682. ENET_API void* enet_peer_get_data(const ENetPeer*);
  683. ENET_API void enet_peer_set_data(ENetPeer*, const void*);
  684. /*
  685. =======================================================================
  686. Private API
  687. =======================================================================
  688. */
  689. extern void enet_host_bandwidth_throttle(ENetHost*);
  690. extern uint64_t enet_host_random_seed(void);
  691. extern int enet_peer_throttle(ENetPeer*, uint32_t);
  692. extern void enet_peer_reset_queues(ENetPeer*);
  693. extern int enet_peer_has_outgoing_commands(ENetPeer*);
  694. extern void enet_peer_setup_outgoing_command(ENetPeer*, ENetOutgoingCommand*);
  695. extern ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer*, const ENetProtocol*, ENetPacket*, uint32_t, uint16_t);
  696. extern ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer*, const ENetProtocol*, const void*, size_t, uint32_t, uint32_t);
  697. extern ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer*, const ENetProtocol*, uint16_t);
  698. extern void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer*, ENetChannel*, ENetIncomingCommand*);
  699. extern void enet_peer_dispatch_incoming_reliable_commands(ENetPeer*, ENetChannel*, ENetIncomingCommand*);
  700. extern void enet_peer_on_connect(ENetPeer*);
  701. extern void enet_peer_on_disconnect(ENetPeer*);
  702. extern size_t enet_protocol_command_size(uint8_t);
  703. #ifdef __cplusplus
  704. }
  705. #endif
  706. #if defined(ENET_IMPLEMENTATION) && !defined(ENET_IMPLEMENTATION_DONE)
  707. #define ENET_IMPLEMENTATION_DONE 1
  708. #ifdef _MSC_VER
  709. #pragma warning(push)
  710. #pragma warning(disable: 4244) /* 64-bit to 32-bit integer conversion */
  711. #pragma warning(disable: 4267) /* size_t to integer conversion */
  712. #endif
  713. /*
  714. =======================================================================
  715. Atomics
  716. =======================================================================
  717. */
  718. #ifdef _MSC_VER
  719. #define ENET_AT_CASSERT_PRED(predicate) sizeof(char[2 * !!(predicate) - 1])
  720. #define ENET_IS_SUPPORTED_ATOMIC(size) ENET_AT_CASSERT_PRED(size == 1 || size == 2 || size == 4 || size == 8)
  721. #define ENET_ATOMIC_SIZEOF(variable) (ENET_IS_SUPPORTED_ATOMIC(sizeof(*(variable))), sizeof(*(variable)))
  722. __inline int64_t enet_at_atomic_read(char* ptr, size_t size) {
  723. switch (size) {
  724. case 1:
  725. return _InterlockedExchangeAdd8((volatile char*)ptr, 0);
  726. case 2:
  727. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, 0);
  728. case 4:
  729. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  730. return InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  731. #else
  732. return _InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  733. #endif
  734. case 8:
  735. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  736. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  737. #else
  738. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  739. #endif
  740. default:
  741. return 0x0;
  742. }
  743. }
  744. __inline int64_t enet_at_atomic_write(char* ptr, int64_t value, size_t size) {
  745. switch (size) {
  746. case 1:
  747. return _InterlockedExchange8((volatile char*)ptr, (char)value);
  748. case 2:
  749. return _InterlockedExchange16((volatile SHORT*)ptr, (SHORT)value);
  750. case 4:
  751. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  752. return InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  753. #else
  754. return _InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  755. #endif
  756. case 8:
  757. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  758. return InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  759. #else
  760. return _InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  761. #endif
  762. default:
  763. return 0x0;
  764. }
  765. }
  766. __inline int64_t enet_at_atomic_cas(char* ptr, int64_t new_val, int64_t old_val, size_t size) {
  767. switch (size) {
  768. case 1:
  769. return _InterlockedCompareExchange8((volatile char*)ptr, (char)new_val, (char)old_val);
  770. case 2:
  771. return _InterlockedCompareExchange16((volatile SHORT*)ptr, (SHORT)new_val, (SHORT)old_val);
  772. case 4:
  773. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  774. return InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  775. #else
  776. return _InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  777. #endif
  778. case 8:
  779. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  780. return InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  781. #else
  782. return _InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  783. #endif
  784. default:
  785. return 0x0;
  786. }
  787. }
  788. __inline int64_t enet_at_atomic_inc(char* ptr, int64_t delta, size_t data_size) {
  789. switch (data_size) {
  790. case 1:
  791. return _InterlockedExchangeAdd8((volatile char*)ptr, (char)delta);
  792. case 2:
  793. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, (SHORT)delta);
  794. case 4:
  795. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  796. return InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  797. #else
  798. return _InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  799. #endif
  800. case 8:
  801. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  802. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  803. #else
  804. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  805. #endif
  806. default:
  807. return 0x0;
  808. }
  809. }
  810. #define ENET_ATOMIC_READ(variable) enet_at_atomic_read((char*)(variable), ENET_ATOMIC_SIZEOF(variable))
  811. #define ENET_ATOMIC_WRITE(variable, new_val) enet_at_atomic_write((char*)(variable), (int64_t)(new_val), ENET_ATOMIC_SIZEOF(variable))
  812. #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))
  813. #define ENET_ATOMIC_INC(variable) enet_at_atomic_inc((char*)(variable), 1, ENET_ATOMIC_SIZEOF(variable))
  814. #define ENET_ATOMIC_DEC(variable) enet_at_atomic_inc((char*)(variable), -1, ENET_ATOMIC_SIZEOF(variable))
  815. #define ENET_ATOMIC_INC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), (delta), ENET_ATOMIC_SIZEOF(variable))
  816. #define ENET_ATOMIC_DEC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), -(delta), ENET_ATOMIC_SIZEOF(variable))
  817. #elif defined(__GNUC__) || defined(__clang__)
  818. #if defined(__clang__) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
  819. #define AT_HAVE_ATOMICS
  820. #endif
  821. /* We want to use __atomic built-ins if possible because the __sync primitives are
  822. deprecated, because the __atomic build-ins allow us to use ENET_ATOMIC_WRITE on
  823. uninitialized memory without running into undefined behavior, and because the
  824. __atomic versions generate more efficient code since we don't need to rely on
  825. CAS when we don't actually want it.
  826. Note that we use acquire-release memory order (like mutexes do). We could use
  827. sequentially consistent memory order but that has lower performance and is
  828. almost always unneeded. */
  829. #ifdef AT_HAVE_ATOMICS
  830. #define ENET_ATOMIC_READ(ptr) __atomic_load_n((ptr), __ATOMIC_ACQUIRE)
  831. #define ENET_ATOMIC_WRITE(ptr, value) __atomic_store_n((ptr), (value), __ATOMIC_RELEASE)
  832. #ifndef typeof
  833. #define typeof __typeof__
  834. #endif
  835. /* clang_analyzer doesn't know that CAS writes to memory so it complains about
  836. potentially lost data. Replace the code with the equivalent non-sync code. */
  837. #ifdef __clang_analyzer__
  838. #define ENET_ATOMIC_CAS(ptr, old_value, new_value)\
  839. ({\
  840. typeof(*(ptr)) ENET_ATOMIC_CAS_old_actual_ = (*(ptr));\
  841. if (ATOMIC_CAS_old_actual_ == (old_value))\
  842. *(ptr) = new_value;\
  843. ENET_ATOMIC_CAS_old_actual_;\
  844. })
  845. #else
  846. /* Could use __auto_type instead of typeof but that shouldn't work in C++.
  847. The ({ }) syntax is a GCC extension called statement expression. It lets
  848. us return a value out of the macro.
  849. TODO We should return bool here instead of the old value to avoid the ABA
  850. problem. */
  851. #define ENET_ATOMIC_CAS(ptr, old_value, new_value)\
  852. ({\
  853. typeof(*(ptr)) ENET_ATOMIC_CAS_expected_ = (old_value);\
  854. __atomic_compare_exchange_n((ptr), &ENET_ATOMIC_CAS_expected_, (new_value), false,\
  855. __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE);\
  856. ENET_ATOMIC_CAS_expected_;\
  857. })
  858. #endif
  859. #define ENET_ATOMIC_INC(ptr) __atomic_fetch_add((ptr), 1, __ATOMIC_ACQ_REL)
  860. #define ENET_ATOMIC_DEC(ptr) __atomic_fetch_sub((ptr), 1, __ATOMIC_ACQ_REL)
  861. #define ENET_ATOMIC_INC_BY(ptr, delta) __atomic_fetch_add((ptr), (delta), __ATOMIC_ACQ_REL)
  862. #define ENET_ATOMIC_DEC_BY(ptr, delta) __atomic_fetch_sub((ptr), (delta), __ATOMIC_ACQ_REL)
  863. #else
  864. #define ENET_ATOMIC_READ(variable) __sync_fetch_and_add(variable, 0)
  865. #define ENET_ATOMIC_WRITE(variable, new_val) (void)__sync_val_compare_and_swap((variable), *(variable), (new_val))
  866. #define ENET_ATOMIC_CAS(variable, old_value, new_val) __sync_val_compare_and_swap((variable), (old_value), (new_val))
  867. #define ENET_ATOMIC_INC(variable) __sync_fetch_and_add((variable), 1)
  868. #define ENET_ATOMIC_DEC(variable) __sync_fetch_and_sub((variable), 1)
  869. #define ENET_ATOMIC_INC_BY(variable, delta) __sync_fetch_and_add((variable), (delta), 1)
  870. #define ENET_ATOMIC_DEC_BY(variable, delta) __sync_fetch_and_sub((variable), (delta), 1)
  871. #endif
  872. #undef AT_HAVE_ATOMICS
  873. #endif
  874. /*
  875. =======================================================================
  876. Callbacks
  877. =======================================================================
  878. */
  879. static ENetCallbacks callbacks = {
  880. malloc,
  881. free,
  882. abort
  883. };
  884. int enet_initialize_with_callbacks(ENetVersion version, const ENetCallbacks* inits) {
  885. if (version < ENET_VERSION_CREATE(1, 3, 0))
  886. return -1;
  887. if (inits->malloc != NULL || inits->free != NULL) {
  888. if (inits->malloc == NULL || inits->free == NULL)
  889. return -1;
  890. callbacks.malloc = inits->malloc;
  891. callbacks.free = inits->free;
  892. }
  893. if (inits->noMemory != NULL)
  894. callbacks.noMemory = inits->noMemory;
  895. return enet_initialize();
  896. }
  897. void* enet_malloc(size_t size) {
  898. void* memory = callbacks.malloc(size);
  899. if (memory == NULL)
  900. callbacks.noMemory();
  901. return memory;
  902. }
  903. void enet_free(void* memory) {
  904. callbacks.free(memory);
  905. }
  906. /*
  907. =======================================================================
  908. List
  909. =======================================================================
  910. */
  911. void enet_list_clear(ENetList* list) {
  912. list->sentinel.next = &list->sentinel;
  913. list->sentinel.previous = &list->sentinel;
  914. }
  915. ENetListIterator enet_list_insert(ENetListIterator position, void* data) {
  916. ENetListIterator result = (ENetListIterator)data;
  917. result->previous = position->previous;
  918. result->next = position;
  919. result->previous->next = result;
  920. position->previous = result;
  921. return result;
  922. }
  923. void* enet_list_remove(ENetListIterator position) {
  924. position->previous->next = position->next;
  925. position->next->previous = position->previous;
  926. return position;
  927. }
  928. ENetListIterator enet_list_move(ENetListIterator position, void* dataFirst, void* dataLast) {
  929. ENetListIterator first = (ENetListIterator)dataFirst;
  930. ENetListIterator last = (ENetListIterator)dataLast;
  931. first->previous->next = last->next;
  932. last->next->previous = first->previous;
  933. first->previous = position->previous;
  934. last->next = position;
  935. first->previous->next = first;
  936. position->previous = last;
  937. return first;
  938. }
  939. size_t enet_list_size(ENetList* list) {
  940. size_t size = 0;
  941. ENetListIterator position;
  942. for (position = enet_list_begin(list); position != enet_list_end(list); position = enet_list_next(position)) {
  943. ++size;
  944. }
  945. return size;
  946. }
  947. /*
  948. =======================================================================
  949. Utilities
  950. =======================================================================
  951. */
  952. ENetVersion enet_linked_version(void) {
  953. return ENET_VERSION;
  954. }
  955. int enet_array_is_zeroed(const uint8_t* array, int length) {
  956. size_t i;
  957. for (i = 0; i < length; i++) {
  958. if (array[i] != 0)
  959. return -1;
  960. }
  961. return 0;
  962. }
  963. /*
  964. =======================================================================
  965. Time
  966. =======================================================================
  967. */
  968. #ifdef _WIN32
  969. static LARGE_INTEGER gettime_offset(void) {
  970. SYSTEMTIME s;
  971. FILETIME f;
  972. LARGE_INTEGER t;
  973. s.wYear = 1970;
  974. s.wMonth = 1;
  975. s.wDay = 1;
  976. s.wHour = 0;
  977. s.wMinute = 0;
  978. s.wSecond = 0;
  979. s.wMilliseconds = 0;
  980. SystemTimeToFileTime(&s, &f);
  981. t.QuadPart = f.dwHighDateTime;
  982. t.QuadPart <<= 32;
  983. t.QuadPart |= f.dwLowDateTime;
  984. return t;
  985. }
  986. int clock_gettime(int X, struct timespec* tv) {
  987. LARGE_INTEGER t;
  988. FILETIME f;
  989. double microseconds;
  990. static LARGE_INTEGER offset;
  991. static double frequencyToMicroseconds;
  992. static int initialized = 0;
  993. static BOOL usePerformanceCounter = 0;
  994. if (!initialized) {
  995. LARGE_INTEGER performanceFrequency;
  996. initialized = 1;
  997. usePerformanceCounter = QueryPerformanceFrequency(&performanceFrequency);
  998. if (usePerformanceCounter) {
  999. QueryPerformanceCounter(&offset);
  1000. frequencyToMicroseconds = (double)performanceFrequency.QuadPart / 1000000.;
  1001. } else {
  1002. offset = gettime_offset();
  1003. frequencyToMicroseconds = 10.;
  1004. }
  1005. }
  1006. if (usePerformanceCounter) {
  1007. QueryPerformanceCounter(&t);
  1008. } else {
  1009. GetSystemTimeAsFileTime(&f);
  1010. t.QuadPart = f.dwHighDateTime;
  1011. t.QuadPart <<= 32;
  1012. t.QuadPart |= f.dwLowDateTime;
  1013. }
  1014. t.QuadPart -= offset.QuadPart;
  1015. microseconds = (double)t.QuadPart / frequencyToMicroseconds;
  1016. t.QuadPart = (LONGLONG)microseconds;
  1017. tv->tv_sec = (long)(t.QuadPart / 1000000);
  1018. tv->tv_nsec = t.QuadPart % 1000000 * 1000;
  1019. return 0;
  1020. }
  1021. #elif __APPLE__ && (__MAC_OS_X_VERSION_MIN_REQUIRED < 101200 || __IPHONE_OS_VERSION_MIN_REQUIRED < 100000) && !defined(CLOCK_MONOTONIC)
  1022. #define CLOCK_MONOTONIC 0
  1023. int clock_gettime(int X, struct timespec* ts) {
  1024. clock_serv_t cclock;
  1025. mach_timespec_t mts;
  1026. host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
  1027. clock_get_time(cclock, &mts);
  1028. mach_port_deallocate(mach_task_self(), cclock);
  1029. ts->tv_sec = mts.tv_sec;
  1030. ts->tv_nsec = mts.tv_nsec;
  1031. return 0;
  1032. }
  1033. #endif
  1034. uint32_t enet_time_get(void) {
  1035. static uint64_t start_time_ns = 0;
  1036. struct timespec ts;
  1037. #ifdef CLOCK_MONOTONIC_RAW
  1038. clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
  1039. #else
  1040. clock_gettime(CLOCK_MONOTONIC, &ts);
  1041. #endif
  1042. static const uint64_t ns_in_s = 1000 * 1000 * 1000;
  1043. static const uint64_t ns_in_ms = 1000 * 1000;
  1044. uint64_t current_time_ns = ts.tv_nsec + (uint64_t)ts.tv_sec * ns_in_s;
  1045. uint64_t offset_ns = ENET_ATOMIC_READ(&start_time_ns);
  1046. if (offset_ns == 0) {
  1047. uint64_t want_value = current_time_ns - 1 * ns_in_ms;
  1048. uint64_t old_value = ENET_ATOMIC_CAS(&start_time_ns, 0, want_value);
  1049. offset_ns = old_value == 0 ? want_value : old_value;
  1050. }
  1051. uint64_t result_in_ns = current_time_ns - offset_ns;
  1052. return (uint32_t)(result_in_ns / ns_in_ms);
  1053. }
  1054. /*
  1055. =======================================================================
  1056. Checksum
  1057. =======================================================================
  1058. */
  1059. typedef uint64_t enet_checksum;
  1060. static const uint64_t crcTable[256] = {
  1061. UINT64_C(0x0000000000000000), UINT64_C(0x7ad870c830358979),
  1062. UINT64_C(0xf5b0e190606b12f2), UINT64_C(0x8f689158505e9b8b),
  1063. UINT64_C(0xc038e5739841b68f), UINT64_C(0xbae095bba8743ff6),
  1064. UINT64_C(0x358804e3f82aa47d), UINT64_C(0x4f50742bc81f2d04),
  1065. UINT64_C(0xab28ecb46814fe75), UINT64_C(0xd1f09c7c5821770c),
  1066. UINT64_C(0x5e980d24087fec87), UINT64_C(0x24407dec384a65fe),
  1067. UINT64_C(0x6b1009c7f05548fa), UINT64_C(0x11c8790fc060c183),
  1068. UINT64_C(0x9ea0e857903e5a08), UINT64_C(0xe478989fa00bd371),
  1069. UINT64_C(0x7d08ff3b88be6f81), UINT64_C(0x07d08ff3b88be6f8),
  1070. UINT64_C(0x88b81eabe8d57d73), UINT64_C(0xf2606e63d8e0f40a),
  1071. UINT64_C(0xbd301a4810ffd90e), UINT64_C(0xc7e86a8020ca5077),
  1072. UINT64_C(0x4880fbd87094cbfc), UINT64_C(0x32588b1040a14285),
  1073. UINT64_C(0xd620138fe0aa91f4), UINT64_C(0xacf86347d09f188d),
  1074. UINT64_C(0x2390f21f80c18306), UINT64_C(0x594882d7b0f40a7f),
  1075. UINT64_C(0x1618f6fc78eb277b), UINT64_C(0x6cc0863448deae02),
  1076. UINT64_C(0xe3a8176c18803589), UINT64_C(0x997067a428b5bcf0),
  1077. UINT64_C(0xfa11fe77117cdf02), UINT64_C(0x80c98ebf2149567b),
  1078. UINT64_C(0x0fa11fe77117cdf0), UINT64_C(0x75796f2f41224489),
  1079. UINT64_C(0x3a291b04893d698d), UINT64_C(0x40f16bccb908e0f4),
  1080. UINT64_C(0xcf99fa94e9567b7f), UINT64_C(0xb5418a5cd963f206),
  1081. UINT64_C(0x513912c379682177), UINT64_C(0x2be1620b495da80e),
  1082. UINT64_C(0xa489f35319033385), UINT64_C(0xde51839b2936bafc),
  1083. UINT64_C(0x9101f7b0e12997f8), UINT64_C(0xebd98778d11c1e81),
  1084. UINT64_C(0x64b116208142850a), UINT64_C(0x1e6966e8b1770c73),
  1085. UINT64_C(0x8719014c99c2b083), UINT64_C(0xfdc17184a9f739fa),
  1086. UINT64_C(0x72a9e0dcf9a9a271), UINT64_C(0x08719014c99c2b08),
  1087. UINT64_C(0x4721e43f0183060c), UINT64_C(0x3df994f731b68f75),
  1088. UINT64_C(0xb29105af61e814fe), UINT64_C(0xc849756751dd9d87),
  1089. UINT64_C(0x2c31edf8f1d64ef6), UINT64_C(0x56e99d30c1e3c78f),
  1090. UINT64_C(0xd9810c6891bd5c04), UINT64_C(0xa3597ca0a188d57d),
  1091. UINT64_C(0xec09088b6997f879), UINT64_C(0x96d1784359a27100),
  1092. UINT64_C(0x19b9e91b09fcea8b), UINT64_C(0x636199d339c963f2),
  1093. UINT64_C(0xdf7adabd7a6e2d6f), UINT64_C(0xa5a2aa754a5ba416),
  1094. UINT64_C(0x2aca3b2d1a053f9d), UINT64_C(0x50124be52a30b6e4),
  1095. UINT64_C(0x1f423fcee22f9be0), UINT64_C(0x659a4f06d21a1299),
  1096. UINT64_C(0xeaf2de5e82448912), UINT64_C(0x902aae96b271006b),
  1097. UINT64_C(0x74523609127ad31a), UINT64_C(0x0e8a46c1224f5a63),
  1098. UINT64_C(0x81e2d7997211c1e8), UINT64_C(0xfb3aa75142244891),
  1099. UINT64_C(0xb46ad37a8a3b6595), UINT64_C(0xceb2a3b2ba0eecec),
  1100. UINT64_C(0x41da32eaea507767), UINT64_C(0x3b024222da65fe1e),
  1101. UINT64_C(0xa2722586f2d042ee), UINT64_C(0xd8aa554ec2e5cb97),
  1102. UINT64_C(0x57c2c41692bb501c), UINT64_C(0x2d1ab4dea28ed965),
  1103. UINT64_C(0x624ac0f56a91f461), UINT64_C(0x1892b03d5aa47d18),
  1104. UINT64_C(0x97fa21650afae693), UINT64_C(0xed2251ad3acf6fea),
  1105. UINT64_C(0x095ac9329ac4bc9b), UINT64_C(0x7382b9faaaf135e2),
  1106. UINT64_C(0xfcea28a2faafae69), UINT64_C(0x8632586aca9a2710),
  1107. UINT64_C(0xc9622c4102850a14), UINT64_C(0xb3ba5c8932b0836d),
  1108. UINT64_C(0x3cd2cdd162ee18e6), UINT64_C(0x460abd1952db919f),
  1109. UINT64_C(0x256b24ca6b12f26d), UINT64_C(0x5fb354025b277b14),
  1110. UINT64_C(0xd0dbc55a0b79e09f), UINT64_C(0xaa03b5923b4c69e6),
  1111. UINT64_C(0xe553c1b9f35344e2), UINT64_C(0x9f8bb171c366cd9b),
  1112. UINT64_C(0x10e3202993385610), UINT64_C(0x6a3b50e1a30ddf69),
  1113. UINT64_C(0x8e43c87e03060c18), UINT64_C(0xf49bb8b633338561),
  1114. UINT64_C(0x7bf329ee636d1eea), UINT64_C(0x012b592653589793),
  1115. UINT64_C(0x4e7b2d0d9b47ba97), UINT64_C(0x34a35dc5ab7233ee),
  1116. UINT64_C(0xbbcbcc9dfb2ca865), UINT64_C(0xc113bc55cb19211c),
  1117. UINT64_C(0x5863dbf1e3ac9dec), UINT64_C(0x22bbab39d3991495),
  1118. UINT64_C(0xadd33a6183c78f1e), UINT64_C(0xd70b4aa9b3f20667),
  1119. UINT64_C(0x985b3e827bed2b63), UINT64_C(0xe2834e4a4bd8a21a),
  1120. UINT64_C(0x6debdf121b863991), UINT64_C(0x1733afda2bb3b0e8),
  1121. UINT64_C(0xf34b37458bb86399), UINT64_C(0x8993478dbb8deae0),
  1122. UINT64_C(0x06fbd6d5ebd3716b), UINT64_C(0x7c23a61ddbe6f812),
  1123. UINT64_C(0x3373d23613f9d516), UINT64_C(0x49aba2fe23cc5c6f),
  1124. UINT64_C(0xc6c333a67392c7e4), UINT64_C(0xbc1b436e43a74e9d),
  1125. UINT64_C(0x95ac9329ac4bc9b5), UINT64_C(0xef74e3e19c7e40cc),
  1126. UINT64_C(0x601c72b9cc20db47), UINT64_C(0x1ac40271fc15523e),
  1127. UINT64_C(0x5594765a340a7f3a), UINT64_C(0x2f4c0692043ff643),
  1128. UINT64_C(0xa02497ca54616dc8), UINT64_C(0xdafce7026454e4b1),
  1129. UINT64_C(0x3e847f9dc45f37c0), UINT64_C(0x445c0f55f46abeb9),
  1130. UINT64_C(0xcb349e0da4342532), UINT64_C(0xb1eceec59401ac4b),
  1131. UINT64_C(0xfebc9aee5c1e814f), UINT64_C(0x8464ea266c2b0836),
  1132. UINT64_C(0x0b0c7b7e3c7593bd), UINT64_C(0x71d40bb60c401ac4),
  1133. UINT64_C(0xe8a46c1224f5a634), UINT64_C(0x927c1cda14c02f4d),
  1134. UINT64_C(0x1d148d82449eb4c6), UINT64_C(0x67ccfd4a74ab3dbf),
  1135. UINT64_C(0x289c8961bcb410bb), UINT64_C(0x5244f9a98c8199c2),
  1136. UINT64_C(0xdd2c68f1dcdf0249), UINT64_C(0xa7f41839ecea8b30),
  1137. UINT64_C(0x438c80a64ce15841), UINT64_C(0x3954f06e7cd4d138),
  1138. UINT64_C(0xb63c61362c8a4ab3), UINT64_C(0xcce411fe1cbfc3ca),
  1139. UINT64_C(0x83b465d5d4a0eece), UINT64_C(0xf96c151de49567b7),
  1140. UINT64_C(0x76048445b4cbfc3c), UINT64_C(0x0cdcf48d84fe7545),
  1141. UINT64_C(0x6fbd6d5ebd3716b7), UINT64_C(0x15651d968d029fce),
  1142. UINT64_C(0x9a0d8ccedd5c0445), UINT64_C(0xe0d5fc06ed698d3c),
  1143. UINT64_C(0xaf85882d2576a038), UINT64_C(0xd55df8e515432941),
  1144. UINT64_C(0x5a3569bd451db2ca), UINT64_C(0x20ed197575283bb3),
  1145. UINT64_C(0xc49581ead523e8c2), UINT64_C(0xbe4df122e51661bb),
  1146. UINT64_C(0x3125607ab548fa30), UINT64_C(0x4bfd10b2857d7349),
  1147. UINT64_C(0x04ad64994d625e4d), UINT64_C(0x7e7514517d57d734),
  1148. UINT64_C(0xf11d85092d094cbf), UINT64_C(0x8bc5f5c11d3cc5c6),
  1149. UINT64_C(0x12b5926535897936), UINT64_C(0x686de2ad05bcf04f),
  1150. UINT64_C(0xe70573f555e26bc4), UINT64_C(0x9ddd033d65d7e2bd),
  1151. UINT64_C(0xd28d7716adc8cfb9), UINT64_C(0xa85507de9dfd46c0),
  1152. UINT64_C(0x273d9686cda3dd4b), UINT64_C(0x5de5e64efd965432),
  1153. UINT64_C(0xb99d7ed15d9d8743), UINT64_C(0xc3450e196da80e3a),
  1154. UINT64_C(0x4c2d9f413df695b1), UINT64_C(0x36f5ef890dc31cc8),
  1155. UINT64_C(0x79a59ba2c5dc31cc), UINT64_C(0x037deb6af5e9b8b5),
  1156. UINT64_C(0x8c157a32a5b7233e), UINT64_C(0xf6cd0afa9582aa47),
  1157. UINT64_C(0x4ad64994d625e4da), UINT64_C(0x300e395ce6106da3),
  1158. UINT64_C(0xbf66a804b64ef628), UINT64_C(0xc5bed8cc867b7f51),
  1159. UINT64_C(0x8aeeace74e645255), UINT64_C(0xf036dc2f7e51db2c),
  1160. UINT64_C(0x7f5e4d772e0f40a7), UINT64_C(0x05863dbf1e3ac9de),
  1161. UINT64_C(0xe1fea520be311aaf), UINT64_C(0x9b26d5e88e0493d6),
  1162. UINT64_C(0x144e44b0de5a085d), UINT64_C(0x6e963478ee6f8124),
  1163. UINT64_C(0x21c640532670ac20), UINT64_C(0x5b1e309b16452559),
  1164. UINT64_C(0xd476a1c3461bbed2), UINT64_C(0xaeaed10b762e37ab),
  1165. UINT64_C(0x37deb6af5e9b8b5b), UINT64_C(0x4d06c6676eae0222),
  1166. UINT64_C(0xc26e573f3ef099a9), UINT64_C(0xb8b627f70ec510d0),
  1167. UINT64_C(0xf7e653dcc6da3dd4), UINT64_C(0x8d3e2314f6efb4ad),
  1168. UINT64_C(0x0256b24ca6b12f26), UINT64_C(0x788ec2849684a65f),
  1169. UINT64_C(0x9cf65a1b368f752e), UINT64_C(0xe62e2ad306bafc57),
  1170. UINT64_C(0x6946bb8b56e467dc), UINT64_C(0x139ecb4366d1eea5),
  1171. UINT64_C(0x5ccebf68aecec3a1), UINT64_C(0x2616cfa09efb4ad8),
  1172. UINT64_C(0xa97e5ef8cea5d153), UINT64_C(0xd3a62e30fe90582a),
  1173. UINT64_C(0xb0c7b7e3c7593bd8), UINT64_C(0xca1fc72bf76cb2a1),
  1174. UINT64_C(0x45775673a732292a), UINT64_C(0x3faf26bb9707a053),
  1175. UINT64_C(0x70ff52905f188d57), UINT64_C(0x0a2722586f2d042e),
  1176. UINT64_C(0x854fb3003f739fa5), UINT64_C(0xff97c3c80f4616dc),
  1177. UINT64_C(0x1bef5b57af4dc5ad), UINT64_C(0x61372b9f9f784cd4),
  1178. UINT64_C(0xee5fbac7cf26d75f), UINT64_C(0x9487ca0fff135e26),
  1179. UINT64_C(0xdbd7be24370c7322), UINT64_C(0xa10fceec0739fa5b),
  1180. UINT64_C(0x2e675fb4576761d0), UINT64_C(0x54bf2f7c6752e8a9),
  1181. UINT64_C(0xcdcf48d84fe75459), UINT64_C(0xb71738107fd2dd20),
  1182. UINT64_C(0x387fa9482f8c46ab), UINT64_C(0x42a7d9801fb9cfd2),
  1183. UINT64_C(0x0df7adabd7a6e2d6), UINT64_C(0x772fdd63e7936baf),
  1184. UINT64_C(0xf8474c3bb7cdf024), UINT64_C(0x829f3cf387f8795d),
  1185. UINT64_C(0x66e7a46c27f3aa2c), UINT64_C(0x1c3fd4a417c62355),
  1186. UINT64_C(0x935745fc4798b8de), UINT64_C(0xe98f353477ad31a7),
  1187. UINT64_C(0xa6df411fbfb21ca3), UINT64_C(0xdc0731d78f8795da),
  1188. UINT64_C(0x536fa08fdfd90e51), UINT64_C(0x29b7d047efec8728),
  1189. };
  1190. uint64_t enet_crc64(const ENetBuffer* buffers, int bufferCount) {
  1191. uint64_t crc = 0xFFFFFFFFFFFFFFFF;
  1192. while (bufferCount-- > 0) {
  1193. const uint8_t* data = (const uint8_t*)buffers->data;
  1194. const uint8_t* dataEnd = &data[buffers->dataLength];
  1195. while (data < dataEnd) {
  1196. crc = (crc >> 8) ^ crcTable[(uint8_t)crc ^* data++];
  1197. }
  1198. ++buffers;
  1199. }
  1200. return ENET_HOST_TO_NET_64(~crc);
  1201. }
  1202. /*
  1203. =======================================================================
  1204. Packet
  1205. =======================================================================
  1206. */
  1207. ENetPacket* enet_packet_create(const void* data, size_t dataLength, uint32_t flags) {
  1208. ENetPacket* packet;
  1209. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1210. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1211. if (packet == NULL)
  1212. return NULL;
  1213. packet->data = (uint8_t*)data;
  1214. } else {
  1215. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength);
  1216. if (packet == NULL)
  1217. return NULL;
  1218. packet->data = (uint8_t*)packet + sizeof(ENetPacket);
  1219. if (data != NULL)
  1220. memcpy(packet->data, data, dataLength);
  1221. }
  1222. packet->referenceCount = 0;
  1223. packet->flags = flags;
  1224. packet->dataLength = dataLength;
  1225. packet->freeCallback = NULL;
  1226. packet->userData = NULL;
  1227. return packet;
  1228. }
  1229. ENetPacket* enet_packet_create_offset(const void* data, size_t dataLength, size_t dataOffset, uint32_t flags) {
  1230. ENetPacket* packet;
  1231. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1232. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1233. if (packet == NULL)
  1234. return NULL;
  1235. packet->data = (uint8_t*)data;
  1236. } else {
  1237. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength - dataOffset);
  1238. if (packet == NULL)
  1239. return NULL;
  1240. packet->data = (uint8_t*)packet + sizeof(ENetPacket);
  1241. if (data != NULL)
  1242. memcpy(packet->data, (char*)data + dataOffset, dataLength - dataOffset);
  1243. }
  1244. packet->referenceCount = 0;
  1245. packet->flags = flags;
  1246. packet->dataLength = dataLength - dataOffset;
  1247. packet->freeCallback = NULL;
  1248. packet->userData = NULL;
  1249. return packet;
  1250. }
  1251. void enet_packet_destroy(ENetPacket* packet) {
  1252. if (packet == NULL)
  1253. return;
  1254. if (packet->freeCallback != NULL)
  1255. (*packet->freeCallback)((void*)packet);
  1256. enet_free(packet);
  1257. }
  1258. /*
  1259. =======================================================================
  1260. Protocol
  1261. =======================================================================
  1262. */
  1263. static size_t commandSizes[ENET_PROTOCOL_COMMAND_COUNT] = {
  1264. 0,
  1265. sizeof(ENetProtocolAcknowledge),
  1266. sizeof(ENetProtocolConnect),
  1267. sizeof(ENetProtocolVerifyConnect),
  1268. sizeof(ENetProtocolDisconnect),
  1269. sizeof(ENetProtocolPing),
  1270. sizeof(ENetProtocolSendReliable),
  1271. sizeof(ENetProtocolSendUnreliable),
  1272. sizeof(ENetProtocolSendFragment),
  1273. sizeof(ENetProtocolSendUnsequenced),
  1274. sizeof(ENetProtocolBandwidthLimit),
  1275. sizeof(ENetProtocolThrottleConfigure),
  1276. sizeof(ENetProtocolSendFragment)
  1277. };
  1278. size_t enet_protocol_command_size(uint8_t commandNumber) {
  1279. return commandSizes[commandNumber & ENET_PROTOCOL_COMMAND_MASK];
  1280. }
  1281. static void enet_protocol_change_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1282. if (state == ENET_PEER_STATE_CONNECTED || state == ENET_PEER_STATE_DISCONNECT_LATER)
  1283. enet_peer_on_connect(peer);
  1284. else
  1285. enet_peer_on_disconnect(peer);
  1286. peer->state = state;
  1287. }
  1288. static void enet_protocol_dispatch_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1289. enet_protocol_change_state(host, peer, state);
  1290. if (!peer->needsDispatch) {
  1291. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1292. peer->needsDispatch = 1;
  1293. }
  1294. }
  1295. static int enet_protocol_dispatch_incoming_commands(ENetHost* host, ENetEvent* event) {
  1296. while (!enet_list_empty(&host->dispatchQueue)) {
  1297. ENetPeer* peer = (ENetPeer*)enet_list_remove(enet_list_begin(&host->dispatchQueue));
  1298. peer->needsDispatch = 0;
  1299. switch (peer->state) {
  1300. case ENET_PEER_STATE_CONNECTION_PENDING:
  1301. case ENET_PEER_STATE_CONNECTION_SUCCEEDED:
  1302. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1303. event->type = ENET_EVENT_TYPE_CONNECT;
  1304. event->peer = peer;
  1305. event->data = peer->eventData;
  1306. return 1;
  1307. case ENET_PEER_STATE_ZOMBIE:
  1308. host->recalculateBandwidthLimits = 1;
  1309. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1310. event->peer = peer;
  1311. event->data = peer->eventData;
  1312. enet_peer_reset(peer);
  1313. return 1;
  1314. case ENET_PEER_STATE_CONNECTED:
  1315. if (enet_list_empty(&peer->dispatchedCommands))
  1316. continue;
  1317. event->packet = enet_peer_receive(peer, &event->channelID);
  1318. if (event->packet == NULL)
  1319. continue;
  1320. event->type = ENET_EVENT_TYPE_RECEIVE;
  1321. event->peer = peer;
  1322. if (!enet_list_empty(&peer->dispatchedCommands)) {
  1323. peer->needsDispatch = 1;
  1324. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1325. }
  1326. return 1;
  1327. default:
  1328. break;
  1329. }
  1330. }
  1331. return 0;
  1332. }
  1333. static void enet_protocol_notify_connect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1334. host->recalculateBandwidthLimits = 1;
  1335. if (event != NULL) {
  1336. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1337. peer->totalDataSent = 0;
  1338. peer->totalDataReceived = 0;
  1339. peer->totalPacketsSent = 0;
  1340. peer->totalPacketsLost = 0;
  1341. event->type = ENET_EVENT_TYPE_CONNECT;
  1342. event->peer = peer;
  1343. event->data = peer->eventData;
  1344. } else {
  1345. enet_protocol_dispatch_state(host, peer, peer->state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING);
  1346. }
  1347. }
  1348. static void enet_protocol_notify_disconnect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1349. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1350. host->recalculateBandwidthLimits = 1;
  1351. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1352. enet_peer_reset(peer);
  1353. } else if (event != NULL) {
  1354. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1355. event->peer = peer;
  1356. event->data = 0;
  1357. enet_peer_reset(peer);
  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. } else if (event != NULL) {
  1369. event->type = ENET_EVENT_TYPE_DISCONNECT_TIMEOUT;
  1370. event->peer = peer;
  1371. event->data = 0;
  1372. enet_peer_reset(peer);
  1373. } else {
  1374. peer->eventData = 0;
  1375. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1376. }
  1377. }
  1378. static void enet_protocol_remove_sent_unreliable_commands(ENetPeer* peer, ENetList* sentUnreliableCommands) {
  1379. ENetOutgoingCommand* outgoingCommand;
  1380. if (enet_list_empty(sentUnreliableCommands))
  1381. return;
  1382. do {
  1383. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(sentUnreliableCommands);
  1384. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1385. if (outgoingCommand->packet != NULL) {
  1386. --outgoingCommand->packet->referenceCount;
  1387. if (outgoingCommand->packet->referenceCount == 0) {
  1388. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1389. enet_packet_destroy(outgoingCommand->packet);
  1390. }
  1391. }
  1392. enet_free(outgoingCommand);
  1393. }
  1394. while (!enet_list_empty(sentUnreliableCommands));
  1395. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && !enet_peer_has_outgoing_commands(peer))
  1396. enet_peer_disconnect(peer, peer->eventData);
  1397. }
  1398. static ENetOutgoingCommand* enet_protocol_find_sent_reliable_command(ENetList* list, uint16_t reliableSequenceNumber, uint8_t channelID) {
  1399. ENetListIterator currentCommand;
  1400. for (currentCommand = enet_list_begin(list); currentCommand != enet_list_end(list); currentCommand = enet_list_next(currentCommand)) {
  1401. ENetOutgoingCommand* outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1402. if (!(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE))
  1403. continue;
  1404. if (outgoingCommand->sendAttempts < 1)
  1405. break;
  1406. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1407. return outgoingCommand;
  1408. }
  1409. return NULL;
  1410. }
  1411. static ENetProtocolCommand enet_protocol_remove_sent_reliable_command(ENetPeer* peer, uint16_t reliableSequenceNumber, uint8_t channelID) {
  1412. ENetOutgoingCommand* outgoingCommand = NULL;
  1413. ENetListIterator currentCommand;
  1414. ENetProtocolCommand commandNumber;
  1415. int wasSent = 1;
  1416. for (currentCommand = enet_list_begin(&peer->sentReliableCommands); currentCommand != enet_list_end(&peer->sentReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1417. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1418. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1419. break;
  1420. }
  1421. if (currentCommand == enet_list_end(&peer->sentReliableCommands)) {
  1422. outgoingCommand = enet_protocol_find_sent_reliable_command(&peer->outgoingCommands, reliableSequenceNumber, channelID);
  1423. if (outgoingCommand == NULL)
  1424. outgoingCommand = enet_protocol_find_sent_reliable_command(&peer->outgoingSendReliableCommands, reliableSequenceNumber, channelID);
  1425. wasSent = 0;
  1426. }
  1427. if (outgoingCommand == NULL)
  1428. return ENET_PROTOCOL_COMMAND_NONE;
  1429. if (channelID < peer->channelCount) {
  1430. ENetChannel* channel = &peer->channels[channelID];
  1431. uint16_t reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1432. if (channel->reliableWindows[reliableWindow] > 0) {
  1433. --channel->reliableWindows[reliableWindow];
  1434. if (!channel->reliableWindows[reliableWindow])
  1435. channel->usedReliableWindows &= ~(1 << reliableWindow);
  1436. }
  1437. }
  1438. commandNumber = (ENetProtocolCommand)(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK);
  1439. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1440. if (outgoingCommand->packet != NULL) {
  1441. if (wasSent)
  1442. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  1443. --outgoingCommand->packet->referenceCount;
  1444. if (outgoingCommand->packet->referenceCount == 0) {
  1445. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1446. enet_packet_destroy(outgoingCommand->packet);
  1447. }
  1448. }
  1449. enet_free(outgoingCommand);
  1450. if (enet_list_empty(&peer->sentReliableCommands))
  1451. return commandNumber;
  1452. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentReliableCommands);
  1453. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  1454. return commandNumber;
  1455. }
  1456. static ENetPeer* enet_protocol_handle_connect(ENetHost* host, ENetProtocolHeader* header, ENetProtocol* command) {
  1457. uint8_t incomingSessionID, outgoingSessionID;
  1458. uint32_t mtu, windowSize;
  1459. ENetChannel* channel;
  1460. size_t channelCount, duplicatePeers = 0;
  1461. ENetPeer* currentPeer, *peer = NULL;
  1462. ENetProtocol verifyCommand;
  1463. channelCount = ENET_NET_TO_HOST_32(command->connect.channelCount);
  1464. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  1465. return NULL;
  1466. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  1467. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED) {
  1468. if (peer == NULL)
  1469. peer = currentPeer;
  1470. } else if (currentPeer->state != ENET_PEER_STATE_CONNECTING && enet_in6_equal(currentPeer->address.ipv6, host->receivedAddress.ipv6)) {
  1471. if (currentPeer->address.port == host->receivedAddress.port && currentPeer->connectID == command->connect.connectID)
  1472. return NULL;
  1473. ++duplicatePeers;
  1474. }
  1475. }
  1476. if (peer == NULL || duplicatePeers >= host->duplicatePeers)
  1477. return NULL;
  1478. if (channelCount > host->channelLimit)
  1479. channelCount = host->channelLimit;
  1480. peer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  1481. if (peer->channels == NULL)
  1482. return NULL;
  1483. peer->channelCount = channelCount;
  1484. peer->state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
  1485. peer->connectID = command->connect.connectID;
  1486. peer->address = host->receivedAddress;
  1487. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->connect.outgoingPeerID);
  1488. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->connect.incomingBandwidth);
  1489. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->connect.outgoingBandwidth);
  1490. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->connect.packetThrottleInterval);
  1491. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleAcceleration);
  1492. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleDeceleration);
  1493. peer->eventData = ENET_NET_TO_HOST_32(command->connect.data);
  1494. incomingSessionID = command->connect.incomingSessionID == 0xFF ? peer->outgoingSessionID : command->connect.incomingSessionID;
  1495. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1496. if (incomingSessionID == peer->outgoingSessionID)
  1497. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1498. peer->outgoingSessionID = incomingSessionID;
  1499. outgoingSessionID = command->connect.outgoingSessionID == 0xFF ? peer->incomingSessionID : command->connect.outgoingSessionID;
  1500. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1501. if (outgoingSessionID == peer->incomingSessionID)
  1502. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1503. peer->incomingSessionID = outgoingSessionID;
  1504. for (channel = peer->channels; channel < &peer->channels[channelCount]; ++channel) {
  1505. channel->outgoingReliableSequenceNumber = 0;
  1506. channel->outgoingUnreliableSequenceNumber = 0;
  1507. channel->incomingReliableSequenceNumber = 0;
  1508. channel->incomingUnreliableSequenceNumber = 0;
  1509. enet_list_clear(&channel->incomingReliableCommands);
  1510. enet_list_clear(&channel->incomingUnreliableCommands);
  1511. channel->usedReliableWindows = 0;
  1512. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  1513. }
  1514. mtu = ENET_NET_TO_HOST_32(command->connect.mtu);
  1515. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1516. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1517. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1518. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1519. if (mtu < peer->mtu)
  1520. peer->mtu = mtu;
  1521. if (host->outgoingBandwidth == 0 && peer->incomingBandwidth == 0)
  1522. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1523. else if (host->outgoingBandwidth == 0 || peer->incomingBandwidth == 0)
  1524. peer->windowSize = (ENET_MAX(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1525. else
  1526. peer->windowSize = (ENET_MIN(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1527. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1528. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1529. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1530. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1531. if (host->incomingBandwidth == 0)
  1532. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1533. else
  1534. windowSize = (host->incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1535. if (windowSize > ENET_NET_TO_HOST_32(command->connect.windowSize))
  1536. windowSize = ENET_NET_TO_HOST_32(command->connect.windowSize);
  1537. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1538. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1539. else if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1540. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1541. verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  1542. verifyCommand.header.channelID = 0xFF;
  1543. verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16(peer->incomingPeerID);
  1544. verifyCommand.verifyConnect.incomingSessionID = incomingSessionID;
  1545. verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID;
  1546. verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_32(peer->mtu);
  1547. verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32(windowSize);
  1548. verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  1549. verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  1550. verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  1551. verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32(peer->packetThrottleInterval);
  1552. verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(peer->packetThrottleAcceleration);
  1553. verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(peer->packetThrottleDeceleration);
  1554. verifyCommand.verifyConnect.connectID = peer->connectID;
  1555. enet_peer_queue_outgoing_command(peer, &verifyCommand, NULL, 0, 0);
  1556. return peer;
  1557. }
  1558. static int enet_protocol_handle_send_reliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1559. size_t dataLength;
  1560. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1561. return -1;
  1562. dataLength = ENET_NET_TO_HOST_16(command->sendReliable.dataLength);
  1563. *currentData += dataLength;
  1564. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1565. return -1;
  1566. if (enet_peer_queue_incoming_command(peer, command, (const uint8_t*)command + sizeof(ENetProtocolSendReliable), dataLength, ENET_PACKET_FLAG_RELIABLE, 0) == NULL)
  1567. return -1;
  1568. return 0;
  1569. }
  1570. static int enet_protocol_handle_send_unsequenced(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1571. uint32_t unsequencedGroup, index;
  1572. size_t dataLength;
  1573. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1574. return -1;
  1575. dataLength = ENET_NET_TO_HOST_16(command->sendUnsequenced.dataLength);
  1576. *currentData += dataLength;
  1577. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1578. return -1;
  1579. unsequencedGroup = ENET_NET_TO_HOST_16(command->sendUnsequenced.unsequencedGroup);
  1580. index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
  1581. if (unsequencedGroup < peer->incomingUnsequencedGroup)
  1582. unsequencedGroup += 0x10000;
  1583. if (unsequencedGroup >= (uint32_t)peer->incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE)
  1584. return 0;
  1585. unsequencedGroup &= 0xFFFF;
  1586. if (unsequencedGroup - index != peer->incomingUnsequencedGroup) {
  1587. peer->incomingUnsequencedGroup = unsequencedGroup - index;
  1588. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  1589. } else if (peer->unsequencedWindow[index / 32] & (1 << (index % 32))) {
  1590. return 0;
  1591. }
  1592. if (enet_peer_queue_incoming_command(peer, command, (const uint8_t*)command + sizeof(ENetProtocolSendUnsequenced), dataLength, ENET_PACKET_FLAG_UNSEQUENCED, 0) == NULL)
  1593. return -1;
  1594. peer->unsequencedWindow[index / 32] |= 1 << (index % 32);
  1595. return 0;
  1596. }
  1597. static int enet_protocol_handle_send_unreliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1598. size_t dataLength;
  1599. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1600. return -1;
  1601. dataLength = ENET_NET_TO_HOST_16(command->sendUnreliable.dataLength);
  1602. *currentData += dataLength;
  1603. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1604. return -1;
  1605. if (enet_peer_queue_incoming_command(peer, command, (const uint8_t*)command + sizeof(ENetProtocolSendUnreliable), dataLength, 0, 0) == NULL)
  1606. return -1;
  1607. return 0;
  1608. }
  1609. static int enet_protocol_handle_send_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1610. uint32_t fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, startSequenceNumber, totalLength;
  1611. ENetChannel* channel;
  1612. uint16_t startWindow, currentWindow;
  1613. ENetListIterator currentCommand;
  1614. ENetIncomingCommand* startCommand = NULL;
  1615. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1616. return -1;
  1617. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1618. *currentData += fragmentLength;
  1619. if (fragmentLength <= 0 || fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1620. return -1;
  1621. channel = &peer->channels[command->header.channelID];
  1622. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1623. startWindow = startSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1624. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1625. if (startSequenceNumber < channel->incomingReliableSequenceNumber)
  1626. startWindow += ENET_PEER_RELIABLE_WINDOWS;
  1627. if (startWindow < currentWindow || startWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1628. return 0;
  1629. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1630. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1631. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1632. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1633. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || totalLength < fragmentCount || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1634. return -1;
  1635. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1636. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1637. if (startSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1638. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1639. continue;
  1640. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1641. break;
  1642. }
  1643. if (incomingCommand->reliableSequenceNumber <= startSequenceNumber) {
  1644. if (incomingCommand->reliableSequenceNumber < startSequenceNumber)
  1645. break;
  1646. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1647. return -1;
  1648. startCommand = incomingCommand;
  1649. break;
  1650. }
  1651. }
  1652. if (startCommand == NULL) {
  1653. ENetProtocol hostCommand = *command;
  1654. hostCommand.header.reliableSequenceNumber = startSequenceNumber;
  1655. startCommand = enet_peer_queue_incoming_command(peer, &hostCommand, NULL, totalLength, ENET_PACKET_FLAG_RELIABLE, fragmentCount);
  1656. if (startCommand == NULL)
  1657. return -1;
  1658. }
  1659. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1660. --startCommand->fragmentsRemaining;
  1661. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1662. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1663. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1664. memcpy(startCommand->packet->data + fragmentOffset, (uint8_t*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1665. if (startCommand->fragmentsRemaining <= 0)
  1666. enet_peer_dispatch_incoming_reliable_commands(peer, channel, NULL);
  1667. }
  1668. return 0;
  1669. }
  1670. static int enet_protocol_handle_send_unreliable_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1671. uint32_t fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, reliableSequenceNumber, startSequenceNumber, totalLength;
  1672. uint16_t reliableWindow, currentWindow;
  1673. ENetChannel* channel;
  1674. ENetListIterator currentCommand;
  1675. ENetIncomingCommand* startCommand = NULL;
  1676. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1677. return -1;
  1678. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1679. *currentData += fragmentLength;
  1680. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1681. return -1;
  1682. channel = &peer->channels[command->header.channelID];
  1683. reliableSequenceNumber = command->header.reliableSequenceNumber;
  1684. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1685. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1686. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1687. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1688. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  1689. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1690. return 0;
  1691. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && startSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  1692. return 0;
  1693. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1694. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1695. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1696. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1697. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1698. return -1;
  1699. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1700. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1701. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1702. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1703. continue;
  1704. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1705. break;
  1706. }
  1707. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  1708. break;
  1709. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  1710. continue;
  1711. if (incomingCommand->unreliableSequenceNumber <= startSequenceNumber) {
  1712. if (incomingCommand->unreliableSequenceNumber < startSequenceNumber)
  1713. break;
  1714. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1715. return -1;
  1716. startCommand = incomingCommand;
  1717. break;
  1718. }
  1719. }
  1720. if (startCommand == NULL) {
  1721. startCommand = enet_peer_queue_incoming_command(peer, command, NULL, totalLength, ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED, fragmentCount);
  1722. if (startCommand == NULL)
  1723. return -1;
  1724. }
  1725. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1726. --startCommand->fragmentsRemaining;
  1727. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1728. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1729. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1730. memcpy(startCommand->packet->data + fragmentOffset, (uint8_t*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1731. if (startCommand->fragmentsRemaining <= 0)
  1732. enet_peer_dispatch_incoming_unreliable_commands(peer, channel, NULL);
  1733. }
  1734. return 0;
  1735. }
  1736. static int enet_protocol_handle_ping(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1737. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1738. return -1;
  1739. return 0;
  1740. }
  1741. static int enet_protocol_handle_bandwidth_limit(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1742. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1743. return -1;
  1744. if (peer->incomingBandwidth != 0)
  1745. --host->bandwidthLimitedPeers;
  1746. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.incomingBandwidth);
  1747. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.outgoingBandwidth);
  1748. if (peer->incomingBandwidth != 0)
  1749. ++host->bandwidthLimitedPeers;
  1750. if (peer->incomingBandwidth == 0 && host->outgoingBandwidth == 0)
  1751. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1752. else if (peer->incomingBandwidth == 0 || host->outgoingBandwidth == 0)
  1753. peer->windowSize = (ENET_MAX(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1754. else
  1755. peer->windowSize = (ENET_MIN(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1756. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1757. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1758. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1759. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1760. return 0;
  1761. }
  1762. static int enet_protocol_handle_throttle_configure(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1763. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1764. return -1;
  1765. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleInterval);
  1766. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleAcceleration);
  1767. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleDeceleration);
  1768. return 0;
  1769. }
  1770. static int enet_protocol_handle_disconnect(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1771. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT)
  1772. return 0;
  1773. enet_peer_reset_queues(peer);
  1774. if (peer->state == ENET_PEER_STATE_CONNECTION_SUCCEEDED || peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_CONNECTING) {
  1775. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1776. } else if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1777. if (peer->state == ENET_PEER_STATE_CONNECTION_PENDING)
  1778. host->recalculateBandwidthLimits = 1;
  1779. enet_peer_reset(peer);
  1780. } else if (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  1781. enet_protocol_change_state(host, peer, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT);
  1782. } else {
  1783. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1784. }
  1785. if (peer->state != ENET_PEER_STATE_DISCONNECTED)
  1786. peer->eventData = ENET_NET_TO_HOST_32(command->disconnect.data);
  1787. return 0;
  1788. }
  1789. static int enet_protocol_handle_acknowledge(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1790. uint32_t roundTripTime, receivedSentTime, receivedReliableSequenceNumber;
  1791. ENetProtocolCommand commandNumber;
  1792. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE)
  1793. return 0;
  1794. receivedSentTime = ENET_NET_TO_HOST_16(command->acknowledge.receivedSentTime);
  1795. receivedSentTime |= host->serviceTime & 0xFFFF0000;
  1796. if ((receivedSentTime & 0x8000) > (host->serviceTime & 0x8000))
  1797. receivedSentTime -= 0x10000;
  1798. if (ENET_TIME_LESS(host->serviceTime, receivedSentTime))
  1799. return 0;
  1800. roundTripTime = ENET_TIME_DIFFERENCE(host->serviceTime, receivedSentTime);
  1801. if (roundTripTime == 0)
  1802. roundTripTime = 1;
  1803. enet_peer_throttle(peer, roundTripTime);
  1804. if (peer->lastReceiveTime > 0) {
  1805. if (roundTripTime >= peer->roundTripTime) {
  1806. uint32_t diff = roundTripTime - peer->roundTripTime;
  1807. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1808. peer->roundTripTimeVariance += diff / 4;
  1809. peer->roundTripTime += diff / 8;
  1810. } else {
  1811. uint32_t diff = peer->roundTripTime - roundTripTime;
  1812. if (diff <= peer->roundTripTimeVariance) {
  1813. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1814. peer->roundTripTimeVariance += diff / 4;
  1815. } else {
  1816. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 32;
  1817. peer->roundTripTimeVariance += diff / 32;
  1818. }
  1819. peer->roundTripTime -= diff / 8;
  1820. }
  1821. } else {
  1822. peer->roundTripTime = roundTripTime;
  1823. peer->roundTripTimeVariance = roundTripTime / 2;
  1824. }
  1825. if (peer->roundTripTime < peer->lowestRoundTripTime)
  1826. peer->lowestRoundTripTime = peer->roundTripTime;
  1827. if (peer->roundTripTimeVariance > peer->highestRoundTripTimeVariance)
  1828. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1829. if (peer->packetThrottleEpoch == 0 || ENET_TIME_DIFFERENCE(host->serviceTime, peer->packetThrottleEpoch) >= peer->packetThrottleInterval) {
  1830. peer->lastRoundTripTime = peer->lowestRoundTripTime;
  1831. peer->lastRoundTripTimeVariance = peer->highestRoundTripTimeVariance;
  1832. peer->lowestRoundTripTime = peer->roundTripTime;
  1833. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1834. peer->packetThrottleEpoch = host->serviceTime;
  1835. }
  1836. peer->lastReceiveTime = ENET_MAX(host->serviceTime, 1);
  1837. peer->earliestTimeout = 0;
  1838. receivedReliableSequenceNumber = ENET_NET_TO_HOST_16(command->acknowledge.receivedReliableSequenceNumber);
  1839. commandNumber = enet_protocol_remove_sent_reliable_command(peer, receivedReliableSequenceNumber, command->header.channelID);
  1840. switch (peer->state) {
  1841. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1842. if (commandNumber != ENET_PROTOCOL_COMMAND_VERIFY_CONNECT)
  1843. return -1;
  1844. enet_protocol_notify_connect(host, peer, event);
  1845. break;
  1846. case ENET_PEER_STATE_DISCONNECTING:
  1847. if (commandNumber != ENET_PROTOCOL_COMMAND_DISCONNECT)
  1848. return -1;
  1849. enet_protocol_notify_disconnect(host, peer, event);
  1850. break;
  1851. case ENET_PEER_STATE_DISCONNECT_LATER:
  1852. if (!enet_peer_has_outgoing_commands(peer))
  1853. enet_peer_disconnect(peer, peer->eventData);
  1854. break;
  1855. default:
  1856. break;
  1857. }
  1858. return 0;
  1859. }
  1860. static int enet_protocol_handle_verify_connect(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1861. uint32_t mtu, windowSize;
  1862. size_t channelCount;
  1863. if (peer->state != ENET_PEER_STATE_CONNECTING)
  1864. return 0;
  1865. channelCount = ENET_NET_TO_HOST_32(command->verifyConnect.channelCount);
  1866. 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) {
  1867. peer->eventData = 0;
  1868. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1869. return -1;
  1870. }
  1871. enet_protocol_remove_sent_reliable_command(peer, 1, 0xFF);
  1872. if (channelCount < peer->channelCount)
  1873. peer->channelCount = channelCount;
  1874. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->verifyConnect.outgoingPeerID);
  1875. peer->incomingSessionID = command->verifyConnect.incomingSessionID;
  1876. peer->outgoingSessionID = command->verifyConnect.outgoingSessionID;
  1877. mtu = ENET_NET_TO_HOST_32(command->verifyConnect.mtu);
  1878. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1879. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1880. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1881. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1882. if (mtu < peer->mtu)
  1883. peer->mtu = mtu;
  1884. windowSize = ENET_NET_TO_HOST_32(command->verifyConnect.windowSize);
  1885. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1886. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1887. if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1888. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1889. if (windowSize < peer->windowSize)
  1890. peer->windowSize = windowSize;
  1891. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.incomingBandwidth);
  1892. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.outgoingBandwidth);
  1893. enet_protocol_notify_connect(host, peer, event);
  1894. return 0;
  1895. }
  1896. static int enet_protocol_handle_incoming_commands(ENetHost* host, ENetEvent* event) {
  1897. ENetProtocolHeader* header;
  1898. ENetProtocol* command;
  1899. ENetPeer* peer;
  1900. uint8_t* currentData;
  1901. size_t headerSize;
  1902. uint16_t peerID, flags;
  1903. uint8_t sessionID;
  1904. if (host->receivedDataLength < (size_t)&((ENetProtocolHeader*)0)->sentTime)
  1905. return 0;
  1906. header = (ENetProtocolHeader*)host->receivedData;
  1907. peerID = ENET_NET_TO_HOST_16(header->peerID);
  1908. sessionID = (peerID & ENET_PROTOCOL_HEADER_SESSION_MASK) >> ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  1909. flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK;
  1910. peerID &= ~(ENET_PROTOCOL_HEADER_FLAG_MASK | ENET_PROTOCOL_HEADER_SESSION_MASK);
  1911. headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof(ENetProtocolHeader) : (size_t)&((ENetProtocolHeader*)0)->sentTime);
  1912. if (host->checksumCallback != NULL)
  1913. headerSize += sizeof(enet_checksum);
  1914. if (peerID == ENET_PROTOCOL_MAXIMUM_PEER_ID) {
  1915. peer = NULL;
  1916. } else if (peerID >= host->peerCount) {
  1917. return 0;
  1918. } else {
  1919. peer = &host->peers[peerID];
  1920. 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))
  1921. return 0;
  1922. }
  1923. if (host->checksumCallback != NULL) {
  1924. enet_checksum* checksum = (enet_checksum*)&host->receivedData[headerSize - sizeof(enet_checksum)];
  1925. enet_checksum desiredChecksum = *checksum;
  1926. ENetBuffer buffer;
  1927. *checksum = peer != NULL ? peer->connectID : 0;
  1928. buffer.data = host->receivedData;
  1929. buffer.dataLength = host->receivedDataLength;
  1930. if (host->checksumCallback(&buffer, 1) != desiredChecksum)
  1931. return 0;
  1932. }
  1933. if (peer != NULL) {
  1934. peer->address.ipv6 = host->receivedAddress.ipv6;
  1935. peer->address.port = host->receivedAddress.port;
  1936. peer->incomingDataTotal += host->receivedDataLength;
  1937. peer->totalDataReceived += host->receivedDataLength;
  1938. }
  1939. currentData = host->receivedData + headerSize;
  1940. while (currentData < &host->receivedData[host->receivedDataLength]) {
  1941. uint8_t commandNumber;
  1942. size_t commandSize;
  1943. command = (ENetProtocol*)currentData;
  1944. if (currentData + sizeof(ENetProtocolCommandHeader) > &host->receivedData[host->receivedDataLength])
  1945. break;
  1946. commandNumber = command->header.command & ENET_PROTOCOL_COMMAND_MASK;
  1947. if (commandNumber >= ENET_PROTOCOL_COMMAND_COUNT)
  1948. break;
  1949. commandSize = commandSizes[commandNumber];
  1950. if (commandSize == 0 || currentData + commandSize > &host->receivedData[host->receivedDataLength])
  1951. break;
  1952. currentData += commandSize;
  1953. if (peer == NULL && (commandNumber != ENET_PROTOCOL_COMMAND_CONNECT || currentData < &host->receivedData[host->receivedDataLength]))
  1954. break;
  1955. command->header.reliableSequenceNumber = ENET_NET_TO_HOST_16(command->header.reliableSequenceNumber);
  1956. switch (commandNumber) {
  1957. case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE:
  1958. if (enet_protocol_handle_acknowledge(host, event, peer, command))
  1959. goto commandError;
  1960. break;
  1961. case ENET_PROTOCOL_COMMAND_CONNECT:
  1962. if (peer != NULL)
  1963. goto commandError;
  1964. if (host->preventConnections == 0) {
  1965. peer = enet_protocol_handle_connect(host, header, command);
  1966. if (peer == NULL)
  1967. goto commandError;
  1968. }
  1969. break;
  1970. case ENET_PROTOCOL_COMMAND_VERIFY_CONNECT:
  1971. if (enet_protocol_handle_verify_connect(host, event, peer, command))
  1972. goto commandError;
  1973. break;
  1974. case ENET_PROTOCOL_COMMAND_DISCONNECT:
  1975. if (enet_protocol_handle_disconnect(host, peer, command))
  1976. goto commandError;
  1977. break;
  1978. case ENET_PROTOCOL_COMMAND_PING:
  1979. if (enet_protocol_handle_ping(host, peer, command))
  1980. goto commandError;
  1981. break;
  1982. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  1983. if (enet_protocol_handle_send_reliable(host, peer, command, &currentData))
  1984. goto commandError;
  1985. break;
  1986. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  1987. if (enet_protocol_handle_send_unreliable(host, peer, command, &currentData))
  1988. goto commandError;
  1989. break;
  1990. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  1991. if (enet_protocol_handle_send_unsequenced(host, peer, command, &currentData))
  1992. goto commandError;
  1993. break;
  1994. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  1995. if (enet_protocol_handle_send_fragment(host, peer, command, &currentData))
  1996. goto commandError;
  1997. break;
  1998. case ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT:
  1999. if (enet_protocol_handle_bandwidth_limit(host, peer, command))
  2000. goto commandError;
  2001. break;
  2002. case ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE:
  2003. if (enet_protocol_handle_throttle_configure(host, peer, command))
  2004. goto commandError;
  2005. break;
  2006. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  2007. if (enet_protocol_handle_send_unreliable_fragment(host, peer, command, &currentData))
  2008. goto commandError;
  2009. break;
  2010. default:
  2011. goto commandError;
  2012. }
  2013. if (peer != NULL && (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0) {
  2014. uint16_t sentTime;
  2015. if (!(flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME))
  2016. break;
  2017. sentTime = ENET_NET_TO_HOST_16(header->sentTime);
  2018. switch (peer->state) {
  2019. case ENET_PEER_STATE_DISCONNECTING:
  2020. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  2021. case ENET_PEER_STATE_DISCONNECTED:
  2022. case ENET_PEER_STATE_ZOMBIE:
  2023. break;
  2024. case ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT:
  2025. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2026. enet_peer_queue_acknowledgement(peer, command, sentTime);
  2027. break;
  2028. default:
  2029. enet_peer_queue_acknowledgement(peer, command, sentTime);
  2030. break;
  2031. }
  2032. }
  2033. }
  2034. commandError:
  2035. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2036. return 1;
  2037. return 0;
  2038. }
  2039. static int enet_protocol_receive_incoming_commands(ENetHost* host, ENetEvent* event) {
  2040. int packets;
  2041. for (packets = 0; packets < 256; ++packets) {
  2042. int receivedLength;
  2043. ENetBuffer buffer;
  2044. buffer.data = host->packetData[0];
  2045. buffer.dataLength = host->mtu;
  2046. receivedLength = enet_socket_receive(host->socket, &host->receivedAddress, &buffer, 1);
  2047. if (receivedLength == -2)
  2048. continue;
  2049. if (receivedLength < 0)
  2050. return -1;
  2051. if (receivedLength == 0)
  2052. return 0;
  2053. host->receivedData = host->packetData[0];
  2054. host->receivedDataLength = receivedLength;
  2055. host->totalReceivedData += receivedLength;
  2056. host->totalReceivedPackets++;
  2057. if (host->interceptCallback != NULL) {
  2058. switch (host->interceptCallback(event, &host->receivedAddress, host->receivedData, host->receivedDataLength)) {
  2059. case 1:
  2060. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2061. return 1;
  2062. continue;
  2063. case -1:
  2064. return -1;
  2065. default:
  2066. break;
  2067. }
  2068. }
  2069. switch (enet_protocol_handle_incoming_commands(host, event)) {
  2070. case 1:
  2071. return 1;
  2072. case -1:
  2073. return -1;
  2074. default:
  2075. break;
  2076. }
  2077. }
  2078. return 0;
  2079. }
  2080. static void enet_protocol_send_acknowledgements(ENetHost* host, ENetPeer* peer) {
  2081. ENetProtocol* command = &host->commands[host->commandCount];
  2082. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2083. ENetAcknowledgement* acknowledgement;
  2084. ENetListIterator currentAcknowledgement;
  2085. uint16_t reliableSequenceNumber;
  2086. currentAcknowledgement = enet_list_begin(&peer->acknowledgements);
  2087. while (currentAcknowledgement != enet_list_end(&peer->acknowledgements)) {
  2088. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < sizeof(ENetProtocolAcknowledge)) {
  2089. peer->continueSending = 1;
  2090. break;
  2091. }
  2092. acknowledgement = (ENetAcknowledgement*)currentAcknowledgement;
  2093. currentAcknowledgement = enet_list_next(currentAcknowledgement);
  2094. buffer->data = command;
  2095. buffer->dataLength = sizeof(ENetProtocolAcknowledge);
  2096. host->packetSize += buffer->dataLength;
  2097. reliableSequenceNumber = ENET_HOST_TO_NET_16(acknowledgement->command.header.reliableSequenceNumber);
  2098. command->header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
  2099. command->header.channelID = acknowledgement->command.header.channelID;
  2100. command->header.reliableSequenceNumber = reliableSequenceNumber;
  2101. command->acknowledge.receivedReliableSequenceNumber = reliableSequenceNumber;
  2102. command->acknowledge.receivedSentTime = ENET_HOST_TO_NET_16(acknowledgement->sentTime);
  2103. if ((acknowledgement->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2104. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  2105. enet_list_remove(&acknowledgement->acknowledgementList);
  2106. enet_free(acknowledgement);
  2107. ++command;
  2108. ++buffer;
  2109. }
  2110. host->commandCount = command - host->commands;
  2111. host->bufferCount = buffer - host->buffers;
  2112. }
  2113. static int enet_protocol_check_timeouts(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  2114. ENetOutgoingCommand* outgoingCommand;
  2115. ENetListIterator currentCommand, insertPosition, insertSendReliablePosition;
  2116. currentCommand = enet_list_begin(&peer->sentReliableCommands);
  2117. insertPosition = enet_list_begin(&peer->outgoingCommands);
  2118. insertSendReliablePosition = enet_list_begin(&peer->outgoingSendReliableCommands);
  2119. while (currentCommand != enet_list_end(&peer->sentReliableCommands)) {
  2120. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2121. currentCommand = enet_list_next(currentCommand);
  2122. if (ENET_TIME_DIFFERENCE(host->serviceTime, outgoingCommand->sentTime) < outgoingCommand->roundTripTimeout)
  2123. continue;
  2124. if (peer->earliestTimeout == 0 || ENET_TIME_LESS(outgoingCommand->sentTime, peer->earliestTimeout))
  2125. peer->earliestTimeout = outgoingCommand->sentTime;
  2126. if (peer->earliestTimeout != 0 && (ENET_TIME_DIFFERENCE(host->serviceTime, peer->earliestTimeout) >= peer->timeoutMaximum || ((1 << (outgoingCommand->sendAttempts - 1)) >= peer->timeoutLimit && ENET_TIME_DIFFERENCE(host->serviceTime, peer->earliestTimeout) >= peer->timeoutMinimum))) {
  2127. enet_protocol_notify_disconnect_timeout(host, peer, event);
  2128. return 1;
  2129. }
  2130. ++peer->totalPacketsLost;
  2131. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2132. if (outgoingCommand->packet != NULL) {
  2133. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  2134. enet_list_insert(insertSendReliablePosition, enet_list_remove(&outgoingCommand->outgoingCommandList));
  2135. } else {
  2136. enet_list_insert(insertPosition, enet_list_remove(&outgoingCommand->outgoingCommandList));
  2137. }
  2138. if (currentCommand == enet_list_begin(&peer->sentReliableCommands) && !enet_list_empty(&peer->sentReliableCommands)) {
  2139. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2140. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  2141. }
  2142. }
  2143. return 0;
  2144. }
  2145. static int enet_protocol_check_outgoing_commands(ENetHost* host, ENetPeer* peer, ENetList* sentUnreliableCommands) {
  2146. ENetProtocol* command = &host->commands[host->commandCount];
  2147. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2148. ENetOutgoingCommand* outgoingCommand;
  2149. ENetListIterator currentCommand, currentSendReliableCommand;
  2150. ENetChannel* channel = NULL;
  2151. uint16_t reliableWindow = 0;
  2152. size_t commandSize = 0;
  2153. int windowWrap = 0, canPing = 1;
  2154. currentCommand = enet_list_begin(&peer->outgoingCommands);
  2155. currentSendReliableCommand = enet_list_begin(&peer->outgoingSendReliableCommands);
  2156. for (;;) {
  2157. if (currentCommand != enet_list_end(&peer->outgoingCommands)) {
  2158. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2159. if (currentSendReliableCommand != enet_list_end(&peer->outgoingSendReliableCommands) && ENET_TIME_LESS(((ENetOutgoingCommand*)currentSendReliableCommand)->queueTime, outgoingCommand->queueTime))
  2160. goto useSendReliableCommand;
  2161. currentCommand = enet_list_next(currentCommand);
  2162. }
  2163. else if (currentSendReliableCommand != enet_list_end(&peer->outgoingSendReliableCommands)) {
  2164. useSendReliableCommand:
  2165. outgoingCommand = (ENetOutgoingCommand*)currentSendReliableCommand;
  2166. currentSendReliableCommand = enet_list_next(currentSendReliableCommand);
  2167. }
  2168. else {
  2169. break;
  2170. }
  2171. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2172. channel = outgoingCommand->command.header.channelID < peer->channelCount ? &peer->channels[outgoingCommand->command.header.channelID] : NULL;
  2173. reliableWindow = outgoingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2174. if (channel != NULL) {
  2175. if (windowWrap) {
  2176. continue;
  2177. } else if (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))))) {
  2178. windowWrap = 1;
  2179. currentSendReliableCommand = enet_list_end(&peer->outgoingSendReliableCommands);
  2180. continue;
  2181. }
  2182. }
  2183. if (outgoingCommand->packet != NULL) {
  2184. uint32_t windowSize = (peer->packetThrottle * peer->windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE;
  2185. if (peer->reliableDataInTransit + outgoingCommand->fragmentLength > ENET_MAX(windowSize, peer->mtu)) {
  2186. currentSendReliableCommand = enet_list_end(&peer->outgoingSendReliableCommands);
  2187. continue;
  2188. }
  2189. }
  2190. canPing = 0;
  2191. }
  2192. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2193. 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))) {
  2194. peer->continueSending = 1;
  2195. break;
  2196. }
  2197. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2198. if (channel != NULL && outgoingCommand->sendAttempts < 1) {
  2199. channel->usedReliableWindows |= 1 << reliableWindow;
  2200. ++channel->reliableWindows[reliableWindow];
  2201. }
  2202. ++outgoingCommand->sendAttempts;
  2203. if (outgoingCommand->roundTripTimeout == 0)
  2204. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2205. if (enet_list_empty(&peer->sentReliableCommands))
  2206. peer->nextTimeout = host->serviceTime + outgoingCommand->roundTripTimeout;
  2207. enet_list_insert(enet_list_end(&peer->sentReliableCommands),
  2208. enet_list_remove(&outgoingCommand->outgoingCommandList));
  2209. outgoingCommand->sentTime = host->serviceTime;
  2210. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_SENT_TIME;
  2211. peer->reliableDataInTransit += outgoingCommand->fragmentLength;
  2212. } else {
  2213. if (outgoingCommand->packet != NULL && outgoingCommand->fragmentOffset == 0 && !(outgoingCommand->packet->flags & (ENET_PACKET_FLAG_UNTHROTTLED))) {
  2214. peer->packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER;
  2215. peer->packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE;
  2216. if (peer->packetThrottleCounter > peer->packetThrottle) {
  2217. uint16_t reliableSequenceNumber = outgoingCommand->reliableSequenceNumber,
  2218. unreliableSequenceNumber = outgoingCommand->unreliableSequenceNumber;
  2219. for (;;) {
  2220. --outgoingCommand->packet->referenceCount;
  2221. if (outgoingCommand->packet->referenceCount == 0)
  2222. enet_packet_destroy(outgoingCommand->packet);
  2223. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2224. enet_free(outgoingCommand);
  2225. if (currentCommand == enet_list_end(&peer->outgoingCommands))
  2226. break;
  2227. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2228. if (outgoingCommand->reliableSequenceNumber != reliableSequenceNumber || outgoingCommand->unreliableSequenceNumber != unreliableSequenceNumber)
  2229. break;
  2230. currentCommand = enet_list_next(currentCommand);
  2231. }
  2232. continue;
  2233. }
  2234. }
  2235. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2236. if (outgoingCommand->packet != NULL)
  2237. enet_list_insert(enet_list_end(sentUnreliableCommands), outgoingCommand);
  2238. }
  2239. buffer->data = command;
  2240. buffer->dataLength = commandSize;
  2241. host->packetSize += buffer->dataLength;
  2242. *command = outgoingCommand->command;
  2243. if (outgoingCommand->packet != NULL) {
  2244. ++buffer;
  2245. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2246. buffer->dataLength = outgoingCommand->fragmentLength;
  2247. host->packetSize += outgoingCommand->fragmentLength;
  2248. } else if (!(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)) {
  2249. enet_free(outgoingCommand);
  2250. }
  2251. ++peer->totalPacketsSent;
  2252. ++command;
  2253. ++buffer;
  2254. }
  2255. host->commandCount = command - host->commands;
  2256. host->bufferCount = buffer - host->buffers;
  2257. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && !enet_peer_has_outgoing_commands(peer) && enet_list_empty(sentUnreliableCommands))
  2258. enet_peer_disconnect(peer, peer->eventData);
  2259. return canPing;
  2260. }
  2261. static int enet_protocol_send_outgoing_commands(ENetHost* host, ENetEvent* event, int checkForTimeouts) {
  2262. uint8_t headerData[sizeof(ENetProtocolHeader) + sizeof(enet_checksum)];
  2263. ENetProtocolHeader* header = (ENetProtocolHeader*)headerData;
  2264. int sentLength = 0;
  2265. ENetList sentUnreliableCommands;
  2266. enet_list_clear(&sentUnreliableCommands);
  2267. for (int sendPass = 0, continueSending = 0; sendPass <= continueSending; ++sendPass) {
  2268. for (ENetPeer* currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2269. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED || currentPeer->state == ENET_PEER_STATE_ZOMBIE || (sendPass > 0 && !currentPeer->continueSending))
  2270. continue;
  2271. currentPeer->continueSending = 0;
  2272. host->headerFlags = 0;
  2273. host->commandCount = 0;
  2274. host->bufferCount = 1;
  2275. host->packetSize = sizeof(ENetProtocolHeader);
  2276. if (host->checksumCallback != NULL)
  2277. host->packetSize += sizeof(enet_checksum);
  2278. if (!enet_list_empty(&currentPeer->acknowledgements))
  2279. enet_protocol_send_acknowledgements(host, currentPeer);
  2280. if (checkForTimeouts != 0 && !enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_GREATER_EQUAL(host->serviceTime, currentPeer->nextTimeout) && enet_protocol_check_timeouts(host, currentPeer, event) == 1) {
  2281. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2282. return 1;
  2283. else
  2284. goto nextPeer;
  2285. }
  2286. if (((enet_list_empty(&currentPeer->outgoingCommands) && enet_list_empty(&currentPeer->outgoingSendReliableCommands)) || enet_protocol_check_outgoing_commands(host, currentPeer, &sentUnreliableCommands)) && enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->lastReceiveTime) >= currentPeer->pingInterval && currentPeer->mtu - host->packetSize >= sizeof(ENetProtocolPing)) {
  2287. enet_peer_ping(currentPeer);
  2288. enet_protocol_check_outgoing_commands(host, currentPeer, &sentUnreliableCommands);
  2289. }
  2290. if (host->commandCount == 0)
  2291. goto nextPeer;
  2292. host->buffers->data = headerData;
  2293. if (host->headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME) {
  2294. header->sentTime = ENET_HOST_TO_NET_16(host->serviceTime & 0xFFFF);
  2295. host->buffers->dataLength = sizeof(ENetProtocolHeader);
  2296. } else {
  2297. host->buffers->dataLength = (size_t)&((ENetProtocolHeader*)0)->sentTime;
  2298. }
  2299. if (currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2300. host->headerFlags |= currentPeer->outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  2301. header->peerID = ENET_HOST_TO_NET_16(currentPeer->outgoingPeerID | host->headerFlags);
  2302. if (host->checksumCallback != NULL) {
  2303. enet_checksum* checksum = (enet_checksum*)&headerData[host->buffers->dataLength];
  2304. *checksum = currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer->connectID : 0;
  2305. host->buffers->dataLength += sizeof(enet_checksum);
  2306. *checksum = host->checksumCallback(host->buffers, host->bufferCount);
  2307. }
  2308. currentPeer->lastSendTime = host->serviceTime;
  2309. sentLength = enet_socket_send(host->socket, &currentPeer->address, host->buffers, host->bufferCount);
  2310. enet_protocol_remove_sent_unreliable_commands(currentPeer, &sentUnreliableCommands);
  2311. if (sentLength < 0)
  2312. return -1;
  2313. host->totalSentData += sentLength;
  2314. currentPeer->totalDataSent += sentLength;
  2315. host->totalSentPackets++;
  2316. nextPeer:
  2317. if (currentPeer->continueSending)
  2318. continueSending = sendPass + 1;
  2319. }
  2320. }
  2321. return 0;
  2322. }
  2323. void enet_host_flush(ENetHost* host) {
  2324. host->serviceTime = enet_time_get();
  2325. enet_protocol_send_outgoing_commands(host, NULL, 0);
  2326. }
  2327. int enet_host_check_events(ENetHost* host, ENetEvent* event) {
  2328. if (event == NULL)
  2329. return -1;
  2330. event->type = ENET_EVENT_TYPE_NONE;
  2331. event->peer = NULL;
  2332. event->packet = NULL;
  2333. return enet_protocol_dispatch_incoming_commands(host, event);
  2334. }
  2335. int enet_host_service(ENetHost* host, ENetEvent* event, uint32_t timeout) {
  2336. uint32_t waitCondition;
  2337. if (event != NULL) {
  2338. event->type = ENET_EVENT_TYPE_NONE;
  2339. event->peer = NULL;
  2340. event->packet = NULL;
  2341. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2342. case 1:
  2343. return 1;
  2344. case -1:
  2345. #ifdef ENET_DEBUG
  2346. perror("Error dispatching incoming packets");
  2347. #endif
  2348. return -1;
  2349. default:
  2350. break;
  2351. }
  2352. }
  2353. host->serviceTime = enet_time_get();
  2354. timeout += host->serviceTime;
  2355. do {
  2356. if (ENET_TIME_DIFFERENCE(host->serviceTime, host->bandwidthThrottleEpoch) >= ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  2357. enet_host_bandwidth_throttle(host);
  2358. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2359. case 1:
  2360. return 1;
  2361. case -1:
  2362. #ifdef ENET_DEBUG
  2363. perror("Error sending outgoing packets");
  2364. #endif
  2365. return -1;
  2366. default:
  2367. break;
  2368. }
  2369. switch (enet_protocol_receive_incoming_commands(host, event)) {
  2370. case 1:
  2371. return 1;
  2372. case -1:
  2373. #ifdef ENET_DEBUG
  2374. perror("Error receiving incoming packets");
  2375. #endif
  2376. return -1;
  2377. default:
  2378. break;
  2379. }
  2380. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2381. case 1:
  2382. return 1;
  2383. case -1:
  2384. #ifdef ENET_DEBUG
  2385. perror("Error sending outgoing packets");
  2386. #endif
  2387. return -1;
  2388. default:
  2389. break;
  2390. }
  2391. if (event != NULL) {
  2392. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2393. case 1:
  2394. return 1;
  2395. case -1:
  2396. #ifdef ENET_DEBUG
  2397. perror("Error dispatching incoming packets");
  2398. #endif
  2399. return -1;
  2400. default:
  2401. break;
  2402. }
  2403. }
  2404. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2405. return 0;
  2406. do {
  2407. host->serviceTime = enet_time_get();
  2408. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2409. return 0;
  2410. waitCondition = ENET_SOCKET_WAIT_RECEIVE | ENET_SOCKET_WAIT_INTERRUPT;
  2411. if (enet_socket_wait(host->socket, &waitCondition, ENET_TIME_DIFFERENCE(timeout, host->serviceTime)) != 0)
  2412. return -1;
  2413. }
  2414. while (waitCondition & ENET_SOCKET_WAIT_INTERRUPT);
  2415. host->serviceTime = enet_time_get();
  2416. }
  2417. while (waitCondition & ENET_SOCKET_WAIT_RECEIVE);
  2418. return 0;
  2419. }
  2420. /*
  2421. =======================================================================
  2422. Peer
  2423. =======================================================================
  2424. */
  2425. void enet_peer_throttle_configure(ENetPeer* peer, uint32_t interval, uint32_t acceleration, uint32_t deceleration, uint32_t threshold) {
  2426. ENetProtocol command;
  2427. peer->packetThrottleThreshold = threshold;
  2428. peer->packetThrottleInterval = interval;
  2429. peer->packetThrottleAcceleration = acceleration;
  2430. peer->packetThrottleDeceleration = deceleration;
  2431. command.header.command = ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2432. command.header.channelID = 0xFF;
  2433. command.throttleConfigure.packetThrottleInterval = ENET_HOST_TO_NET_32(interval);
  2434. command.throttleConfigure.packetThrottleAcceleration = ENET_HOST_TO_NET_32(acceleration);
  2435. command.throttleConfigure.packetThrottleDeceleration = ENET_HOST_TO_NET_32(deceleration);
  2436. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2437. }
  2438. int enet_peer_throttle(ENetPeer* peer, uint32_t rtt) {
  2439. if (peer->lastRoundTripTime <= peer->lastRoundTripTimeVariance) {
  2440. peer->packetThrottle = peer->packetThrottleLimit;
  2441. } else if (rtt < peer->lastRoundTripTime + (peer->lastRoundTripTimeVariance + 1) / 2) {
  2442. peer->packetThrottle += peer->packetThrottleAcceleration;
  2443. if (peer->packetThrottle > peer->packetThrottleLimit)
  2444. peer->packetThrottle = peer->packetThrottleLimit;
  2445. return 1;
  2446. } else if (rtt > peer->lastRoundTripTime + peer->packetThrottleThreshold + 2 * peer->lastRoundTripTimeVariance) {
  2447. if (peer->packetThrottle > peer->packetThrottleDeceleration)
  2448. peer->packetThrottle -= peer->packetThrottleDeceleration;
  2449. else
  2450. peer->packetThrottle = 0;
  2451. return -1;
  2452. }
  2453. return 0;
  2454. }
  2455. int enet_peer_send(ENetPeer* peer, uint8_t channelID, ENetPacket* packet) {
  2456. ENetChannel* channel;
  2457. ENetProtocol command;
  2458. size_t fragmentLength;
  2459. if (peer->state != ENET_PEER_STATE_CONNECTED || channelID >= peer->channelCount || packet->dataLength > peer->host->maximumPacketSize)
  2460. return -1;
  2461. channel = &peer->channels[channelID];
  2462. fragmentLength = peer->mtu - sizeof(ENetProtocolHeader) - sizeof(ENetProtocolSendFragment) - sizeof(ENetProtocolAcknowledge);
  2463. if (peer->host->checksumCallback != NULL)
  2464. fragmentLength -= sizeof(enet_checksum);
  2465. if (packet->dataLength > fragmentLength) {
  2466. uint32_t fragmentCount = (packet->dataLength + fragmentLength - 1) / fragmentLength, fragmentNumber, fragmentOffset;
  2467. uint8_t commandNumber;
  2468. uint16_t startSequenceNumber;
  2469. ENetList fragments;
  2470. ENetOutgoingCommand* fragment;
  2471. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2472. return -1;
  2473. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED)) == ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED && channel->outgoingUnreliableSequenceNumber < 0xFFFF) {
  2474. commandNumber = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT;
  2475. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingUnreliableSequenceNumber + 1);
  2476. } else {
  2477. commandNumber = ENET_PROTOCOL_COMMAND_SEND_FRAGMENT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2478. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingReliableSequenceNumber + 1);
  2479. }
  2480. enet_list_clear(&fragments);
  2481. for (fragmentNumber = 0, fragmentOffset = 0; fragmentOffset < packet->dataLength; ++fragmentNumber, fragmentOffset += fragmentLength) {
  2482. if (packet->dataLength - fragmentOffset < fragmentLength)
  2483. fragmentLength = packet->dataLength - fragmentOffset;
  2484. fragment = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2485. if (fragment == NULL) {
  2486. while (!enet_list_empty(&fragments)) {
  2487. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2488. enet_free(fragment);
  2489. }
  2490. return -1;
  2491. }
  2492. fragment->fragmentOffset = fragmentOffset;
  2493. fragment->fragmentLength = fragmentLength;
  2494. fragment->packet = packet;
  2495. fragment->command.header.command = commandNumber;
  2496. fragment->command.header.channelID = channelID;
  2497. fragment->command.sendFragment.startSequenceNumber = startSequenceNumber;
  2498. fragment->command.sendFragment.dataLength = ENET_HOST_TO_NET_16(fragmentLength);
  2499. fragment->command.sendFragment.fragmentCount = ENET_HOST_TO_NET_32(fragmentCount);
  2500. fragment->command.sendFragment.fragmentNumber = ENET_HOST_TO_NET_32(fragmentNumber);
  2501. fragment->command.sendFragment.totalLength = ENET_HOST_TO_NET_32(packet->dataLength);
  2502. fragment->command.sendFragment.fragmentOffset = ENET_NET_TO_HOST_32(fragmentOffset);
  2503. enet_list_insert(enet_list_end(&fragments), fragment);
  2504. }
  2505. packet->referenceCount += fragmentNumber;
  2506. while (!enet_list_empty(&fragments)) {
  2507. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2508. enet_peer_setup_outgoing_command(peer, fragment);
  2509. }
  2510. return 0;
  2511. }
  2512. command.header.channelID = channelID;
  2513. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNSEQUENCED)) == ENET_PACKET_FLAG_UNSEQUENCED) {
  2514. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2515. command.sendUnsequenced.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2516. } else if (packet->flags & ENET_PACKET_FLAG_RELIABLE || channel->outgoingUnreliableSequenceNumber >= 0xFFFF) {
  2517. command.header.command = ENET_PROTOCOL_COMMAND_SEND_RELIABLE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2518. command.sendReliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2519. } else {
  2520. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE;
  2521. command.sendUnreliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2522. }
  2523. if (enet_peer_queue_outgoing_command(peer, &command, packet, 0, packet->dataLength) == NULL)
  2524. return -1;
  2525. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  2526. enet_host_flush(peer->host);
  2527. return 0;
  2528. }
  2529. ENetPacket* enet_peer_receive(ENetPeer* peer, uint8_t* channelID) {
  2530. ENetIncomingCommand* incomingCommand;
  2531. ENetPacket* packet;
  2532. if (enet_list_empty(&peer->dispatchedCommands))
  2533. return NULL;
  2534. incomingCommand = (ENetIncomingCommand*)enet_list_remove(enet_list_begin(&peer->dispatchedCommands));
  2535. if (channelID != NULL)
  2536. *channelID = incomingCommand->command.header.channelID;
  2537. packet = incomingCommand->packet;
  2538. --packet->referenceCount;
  2539. if (incomingCommand->fragments != NULL)
  2540. enet_free(incomingCommand->fragments);
  2541. enet_free(incomingCommand);
  2542. peer->totalWaitingData -= packet->dataLength;
  2543. return packet;
  2544. }
  2545. static void enet_peer_reset_outgoing_commands(ENetList* queue) {
  2546. ENetOutgoingCommand* outgoingCommand;
  2547. while (!enet_list_empty(queue)) {
  2548. outgoingCommand = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(queue));
  2549. if (outgoingCommand->packet != NULL) {
  2550. --outgoingCommand->packet->referenceCount;
  2551. if (outgoingCommand->packet->referenceCount == 0)
  2552. enet_packet_destroy(outgoingCommand->packet);
  2553. }
  2554. enet_free(outgoingCommand);
  2555. }
  2556. }
  2557. static void enet_peer_remove_incoming_commands(ENetList* queue, ENetListIterator startCommand, ENetListIterator endCommand, ENetIncomingCommand* excludeCommand) {
  2558. ENetListIterator currentCommand;
  2559. for (currentCommand = startCommand; currentCommand != endCommand;) {
  2560. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2561. currentCommand = enet_list_next(currentCommand);
  2562. if (incomingCommand == excludeCommand)
  2563. continue;
  2564. enet_list_remove(&incomingCommand->incomingCommandList);
  2565. if (incomingCommand->packet != NULL) {
  2566. --incomingCommand->packet->referenceCount;
  2567. if (incomingCommand->packet->referenceCount == 0)
  2568. enet_packet_destroy(incomingCommand->packet);
  2569. }
  2570. if (incomingCommand->fragments != NULL)
  2571. enet_free(incomingCommand->fragments);
  2572. enet_free(incomingCommand);
  2573. }
  2574. }
  2575. static void enet_peer_reset_incoming_commands(ENetList* queue) {
  2576. enet_peer_remove_incoming_commands(queue, enet_list_begin(queue), enet_list_end(queue), NULL);
  2577. }
  2578. void enet_peer_reset_queues(ENetPeer* peer) {
  2579. ENetChannel* channel;
  2580. if (peer->needsDispatch) {
  2581. enet_list_remove(&peer->dispatchList);
  2582. peer->needsDispatch = 0;
  2583. }
  2584. while (!enet_list_empty(&peer->acknowledgements)) {
  2585. enet_free(enet_list_remove(enet_list_begin(&peer->acknowledgements)));
  2586. }
  2587. enet_peer_reset_outgoing_commands(&peer->sentReliableCommands);
  2588. enet_peer_reset_outgoing_commands(&peer->outgoingCommands);
  2589. enet_peer_reset_outgoing_commands(&peer->outgoingSendReliableCommands);
  2590. enet_peer_reset_incoming_commands(&peer->dispatchedCommands);
  2591. if (peer->channels != NULL && peer->channelCount > 0) {
  2592. for (channel = peer->channels; channel < &peer->channels[peer->channelCount]; ++channel) {
  2593. enet_peer_reset_incoming_commands(&channel->incomingReliableCommands);
  2594. enet_peer_reset_incoming_commands(&channel->incomingUnreliableCommands);
  2595. }
  2596. enet_free(peer->channels);
  2597. }
  2598. peer->channels = NULL;
  2599. peer->channelCount = 0;
  2600. }
  2601. int enet_peer_has_outgoing_commands(ENetPeer* peer) {
  2602. if (enet_list_empty(&peer->outgoingCommands) && enet_list_empty(&peer->outgoingSendReliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  2603. return 0;
  2604. return 1;
  2605. }
  2606. void enet_peer_on_connect(ENetPeer* peer) {
  2607. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  2608. if (peer->incomingBandwidth != 0)
  2609. ++peer->host->bandwidthLimitedPeers;
  2610. ++peer->host->connectedPeers;
  2611. }
  2612. }
  2613. void enet_peer_on_disconnect(ENetPeer* peer) {
  2614. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2615. if (peer->incomingBandwidth != 0)
  2616. --peer->host->bandwidthLimitedPeers;
  2617. --peer->host->connectedPeers;
  2618. }
  2619. }
  2620. void enet_peer_reset(ENetPeer* peer) {
  2621. enet_peer_on_disconnect(peer);
  2622. peer->outgoingPeerID = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  2623. peer->state = ENET_PEER_STATE_DISCONNECTED;
  2624. peer->incomingBandwidth = 0;
  2625. peer->outgoingBandwidth = 0;
  2626. peer->incomingBandwidthThrottleEpoch = 0;
  2627. peer->outgoingBandwidthThrottleEpoch = 0;
  2628. peer->incomingDataTotal = 0;
  2629. peer->totalDataReceived = 0;
  2630. peer->outgoingDataTotal = 0;
  2631. peer->totalDataSent = 0;
  2632. peer->lastSendTime = 0;
  2633. peer->lastReceiveTime = 0;
  2634. peer->nextTimeout = 0;
  2635. peer->earliestTimeout = 0;
  2636. peer->totalPacketsSent = 0;
  2637. peer->totalPacketsLost = 0;
  2638. peer->packetThrottle = ENET_PEER_DEFAULT_PACKET_THROTTLE;
  2639. peer->packetThrottleThreshold = ENET_PEER_PACKET_THROTTLE_THRESHOLD;
  2640. peer->packetThrottleLimit = ENET_PEER_PACKET_THROTTLE_SCALE;
  2641. peer->packetThrottleCounter = 0;
  2642. peer->packetThrottleEpoch = 0;
  2643. peer->packetThrottleAcceleration = ENET_PEER_PACKET_THROTTLE_ACCELERATION;
  2644. peer->packetThrottleDeceleration = ENET_PEER_PACKET_THROTTLE_DECELERATION;
  2645. peer->packetThrottleInterval = ENET_PEER_PACKET_THROTTLE_INTERVAL;
  2646. peer->pingInterval = ENET_PEER_PING_INTERVAL;
  2647. peer->timeoutLimit = ENET_PEER_TIMEOUT_LIMIT;
  2648. peer->timeoutMinimum = ENET_PEER_TIMEOUT_MINIMUM;
  2649. peer->timeoutMaximum = ENET_PEER_TIMEOUT_MAXIMUM;
  2650. peer->lastRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2651. peer->lowestRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2652. peer->lastRoundTripTimeVariance = 0;
  2653. peer->highestRoundTripTimeVariance = 0;
  2654. peer->roundTripTime = 1;
  2655. peer->roundTripTimeVariance = 0;
  2656. peer->mtu = peer->host->mtu;
  2657. peer->reliableDataInTransit = 0;
  2658. peer->outgoingReliableSequenceNumber = 0;
  2659. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  2660. peer->incomingUnsequencedGroup = 0;
  2661. peer->outgoingUnsequencedGroup = 0;
  2662. peer->eventData = 0;
  2663. peer->totalWaitingData = 0;
  2664. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  2665. enet_peer_reset_queues(peer);
  2666. }
  2667. void enet_peer_ping(ENetPeer* peer) {
  2668. ENetProtocol command;
  2669. if (peer->state != ENET_PEER_STATE_CONNECTED)
  2670. return;
  2671. command.header.command = ENET_PROTOCOL_COMMAND_PING | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2672. command.header.channelID = 0xFF;
  2673. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2674. }
  2675. void enet_peer_ping_interval(ENetPeer* peer, uint32_t pingInterval) {
  2676. peer->pingInterval = pingInterval ? pingInterval : ENET_PEER_PING_INTERVAL;
  2677. }
  2678. void enet_peer_timeout(ENetPeer* peer, uint32_t timeoutLimit, uint32_t timeoutMinimum, uint32_t timeoutMaximum) {
  2679. peer->timeoutLimit = timeoutLimit ? timeoutLimit : ENET_PEER_TIMEOUT_LIMIT;
  2680. peer->timeoutMinimum = timeoutMinimum ? timeoutMinimum : ENET_PEER_TIMEOUT_MINIMUM;
  2681. peer->timeoutMaximum = timeoutMaximum ? timeoutMaximum : ENET_PEER_TIMEOUT_MAXIMUM;
  2682. }
  2683. void enet_peer_disconnect_now(ENetPeer* peer, uint32_t data) {
  2684. ENetProtocol command;
  2685. if (peer->state == ENET_PEER_STATE_DISCONNECTED)
  2686. return;
  2687. if (peer->state != ENET_PEER_STATE_ZOMBIE && peer->state != ENET_PEER_STATE_DISCONNECTING) {
  2688. enet_peer_reset_queues(peer);
  2689. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2690. command.header.channelID = 0xFF;
  2691. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2692. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2693. enet_host_flush(peer->host);
  2694. }
  2695. enet_peer_reset(peer);
  2696. }
  2697. void enet_peer_disconnect(ENetPeer* peer, uint32_t data) {
  2698. ENetProtocol command;
  2699. 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)
  2700. return;
  2701. enet_peer_reset_queues(peer);
  2702. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT;
  2703. command.header.channelID = 0xFF;
  2704. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2705. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2706. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2707. else
  2708. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2709. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2710. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2711. enet_peer_on_disconnect(peer);
  2712. peer->state = ENET_PEER_STATE_DISCONNECTING;
  2713. } else {
  2714. enet_host_flush(peer->host);
  2715. enet_peer_reset(peer);
  2716. }
  2717. }
  2718. void enet_peer_disconnect_later(ENetPeer* peer, uint32_t data) {
  2719. if ((peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) && enet_peer_has_outgoing_commands(peer)) {
  2720. peer->state = ENET_PEER_STATE_DISCONNECT_LATER;
  2721. peer->eventData = data;
  2722. } else {
  2723. enet_peer_disconnect(peer, data);
  2724. }
  2725. }
  2726. ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer* peer, const ENetProtocol* command, uint16_t sentTime) {
  2727. ENetAcknowledgement* acknowledgement;
  2728. if (command->header.channelID < peer->channelCount) {
  2729. ENetChannel* channel = &peer->channels[command->header.channelID];
  2730. uint16_t reliableWindow = command->header.reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2731. uint16_t currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2732. if (command->header.reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2733. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2734. if (reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1 && reliableWindow <= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS)
  2735. return NULL;
  2736. }
  2737. acknowledgement = (ENetAcknowledgement*)enet_malloc(sizeof(ENetAcknowledgement));
  2738. if (acknowledgement == NULL)
  2739. return NULL;
  2740. peer->outgoingDataTotal += sizeof(ENetProtocolAcknowledge);
  2741. acknowledgement->sentTime = sentTime;
  2742. acknowledgement->command = *command;
  2743. enet_list_insert(enet_list_end(&peer->acknowledgements), acknowledgement);
  2744. return acknowledgement;
  2745. }
  2746. void enet_peer_setup_outgoing_command(ENetPeer* peer, ENetOutgoingCommand* outgoingCommand) {
  2747. ENetChannel* channel = &peer->channels[outgoingCommand->command.header.channelID];
  2748. peer->outgoingDataTotal += enet_protocol_command_size(outgoingCommand->command.header.command) + outgoingCommand->fragmentLength;
  2749. if (outgoingCommand->command.header.channelID == 0xFF) {
  2750. ++peer->outgoingReliableSequenceNumber;
  2751. outgoingCommand->reliableSequenceNumber = peer->outgoingReliableSequenceNumber;
  2752. outgoingCommand->unreliableSequenceNumber = 0;
  2753. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2754. ++channel->outgoingReliableSequenceNumber;
  2755. channel->outgoingUnreliableSequenceNumber = 0;
  2756. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2757. outgoingCommand->unreliableSequenceNumber = 0;
  2758. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED) {
  2759. ++peer->outgoingUnsequencedGroup;
  2760. outgoingCommand->reliableSequenceNumber = 0;
  2761. outgoingCommand->unreliableSequenceNumber = 0;
  2762. } else {
  2763. if (outgoingCommand->fragmentOffset == 0)
  2764. ++channel->outgoingUnreliableSequenceNumber;
  2765. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2766. outgoingCommand->unreliableSequenceNumber = channel->outgoingUnreliableSequenceNumber;
  2767. }
  2768. outgoingCommand->sendAttempts = 0;
  2769. outgoingCommand->sentTime = 0;
  2770. outgoingCommand->roundTripTimeout = 0;
  2771. outgoingCommand->command.header.reliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->reliableSequenceNumber);
  2772. outgoingCommand->queueTime = ++peer->host->totalQueued;
  2773. switch (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2774. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2775. outgoingCommand->command.sendUnreliable.unreliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->unreliableSequenceNumber);
  2776. break;
  2777. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2778. outgoingCommand->command.sendUnsequenced.unsequencedGroup = ENET_HOST_TO_NET_16(peer->outgoingUnsequencedGroup);
  2779. break;
  2780. default:
  2781. break;
  2782. }
  2783. if ((outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0 && outgoingCommand->packet != NULL)
  2784. enet_list_insert(enet_list_end(&peer->outgoingSendReliableCommands), outgoingCommand);
  2785. else
  2786. enet_list_insert(enet_list_end(&peer->outgoingCommands), outgoingCommand);
  2787. }
  2788. ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer* peer, const ENetProtocol* command, ENetPacket* packet, uint32_t offset, uint16_t length) {
  2789. ENetOutgoingCommand* outgoingCommand = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2790. if (outgoingCommand == NULL)
  2791. return NULL;
  2792. outgoingCommand->command = *command;
  2793. outgoingCommand->fragmentOffset = offset;
  2794. outgoingCommand->fragmentLength = length;
  2795. outgoingCommand->packet = packet;
  2796. if (packet != NULL)
  2797. ++packet->referenceCount;
  2798. enet_peer_setup_outgoing_command(peer, outgoingCommand);
  2799. return outgoingCommand;
  2800. }
  2801. void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer* peer, ENetChannel* channel, ENetIncomingCommand* queuedCommand) {
  2802. ENetListIterator droppedCommand, startCommand, currentCommand;
  2803. for (droppedCommand = startCommand = currentCommand = enet_list_begin(&channel->incomingUnreliableCommands); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2804. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2805. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2806. continue;
  2807. if (incomingCommand->reliableSequenceNumber == channel->incomingReliableSequenceNumber) {
  2808. if (incomingCommand->fragmentsRemaining <= 0) {
  2809. channel->incomingUnreliableSequenceNumber = incomingCommand->unreliableSequenceNumber;
  2810. continue;
  2811. }
  2812. if (startCommand != currentCommand) {
  2813. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2814. if (!peer->needsDispatch) {
  2815. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2816. peer->needsDispatch = 1;
  2817. }
  2818. droppedCommand = currentCommand;
  2819. } else if (droppedCommand != currentCommand) {
  2820. droppedCommand = enet_list_previous(currentCommand);
  2821. }
  2822. } else {
  2823. uint16_t reliableWindow = incomingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2824. uint16_t currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2825. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2826. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2827. if (reliableWindow >= currentWindow && reliableWindow < currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2828. break;
  2829. droppedCommand = enet_list_next(currentCommand);
  2830. if (startCommand != currentCommand) {
  2831. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2832. if (!peer->needsDispatch) {
  2833. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2834. peer->needsDispatch = 1;
  2835. }
  2836. }
  2837. }
  2838. startCommand = enet_list_next(currentCommand);
  2839. }
  2840. if (startCommand != currentCommand) {
  2841. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2842. if (!peer->needsDispatch) {
  2843. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2844. peer->needsDispatch = 1;
  2845. }
  2846. droppedCommand = currentCommand;
  2847. }
  2848. enet_peer_remove_incoming_commands(&channel->incomingUnreliableCommands, enet_list_begin(&channel->incomingUnreliableCommands), droppedCommand, queuedCommand);
  2849. }
  2850. void enet_peer_dispatch_incoming_reliable_commands(ENetPeer* peer, ENetChannel* channel, ENetIncomingCommand* queuedCommand) {
  2851. ENetListIterator currentCommand;
  2852. for (currentCommand = enet_list_begin(&channel->incomingReliableCommands); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2853. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2854. if (incomingCommand->fragmentsRemaining > 0 || incomingCommand->reliableSequenceNumber != (uint16_t)(channel->incomingReliableSequenceNumber + 1))
  2855. break;
  2856. channel->incomingReliableSequenceNumber = incomingCommand->reliableSequenceNumber;
  2857. if (incomingCommand->fragmentCount > 0)
  2858. channel->incomingReliableSequenceNumber += incomingCommand->fragmentCount - 1;
  2859. }
  2860. if (currentCommand == enet_list_begin(&channel->incomingReliableCommands))
  2861. return;
  2862. channel->incomingUnreliableSequenceNumber = 0;
  2863. enet_list_move(enet_list_end(&peer->dispatchedCommands), enet_list_begin(&channel->incomingReliableCommands), enet_list_previous(currentCommand));
  2864. if (!peer->needsDispatch) {
  2865. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2866. peer->needsDispatch = 1;
  2867. }
  2868. if (!enet_list_empty(&channel->incomingUnreliableCommands))
  2869. enet_peer_dispatch_incoming_unreliable_commands(peer, channel, queuedCommand);
  2870. }
  2871. ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer* peer, const ENetProtocol* command, const void* data, size_t dataLength, uint32_t flags, uint32_t fragmentCount) {
  2872. static ENetIncomingCommand dummyCommand;
  2873. ENetChannel* channel = &peer->channels[command->header.channelID];
  2874. uint32_t unreliableSequenceNumber = 0, reliableSequenceNumber = 0;
  2875. uint16_t reliableWindow, currentWindow;
  2876. ENetIncomingCommand* incomingCommand;
  2877. ENetListIterator currentCommand;
  2878. ENetPacket* packet = NULL;
  2879. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2880. goto discardCommand;
  2881. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) {
  2882. reliableSequenceNumber = command->header.reliableSequenceNumber;
  2883. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2884. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2885. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2886. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2887. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2888. goto discardCommand;
  2889. }
  2890. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2891. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2892. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2893. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber)
  2894. goto discardCommand;
  2895. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2896. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2897. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2898. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2899. continue;
  2900. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2901. break;
  2902. }
  2903. if (incomingCommand->reliableSequenceNumber <= reliableSequenceNumber) {
  2904. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2905. break;
  2906. goto discardCommand;
  2907. }
  2908. }
  2909. break;
  2910. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2911. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  2912. unreliableSequenceNumber = ENET_NET_TO_HOST_16(command->sendUnreliable.unreliableSequenceNumber);
  2913. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && unreliableSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  2914. goto discardCommand;
  2915. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2916. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2917. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2918. continue;
  2919. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2920. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2921. continue;
  2922. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2923. break;
  2924. }
  2925. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2926. break;
  2927. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  2928. continue;
  2929. if (incomingCommand->unreliableSequenceNumber <= unreliableSequenceNumber) {
  2930. if (incomingCommand->unreliableSequenceNumber < unreliableSequenceNumber)
  2931. break;
  2932. goto discardCommand;
  2933. }
  2934. }
  2935. break;
  2936. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2937. currentCommand = enet_list_end(&channel->incomingUnreliableCommands);
  2938. break;
  2939. default:
  2940. goto discardCommand;
  2941. }
  2942. if (peer->totalWaitingData >= peer->host->maximumWaitingData)
  2943. goto notifyError;
  2944. packet = enet_packet_create(data, dataLength, flags);
  2945. if (packet == NULL)
  2946. goto notifyError;
  2947. incomingCommand = (ENetIncomingCommand*)enet_malloc(sizeof(ENetIncomingCommand));
  2948. if (incomingCommand == NULL)
  2949. goto notifyError;
  2950. incomingCommand->reliableSequenceNumber = command->header.reliableSequenceNumber;
  2951. incomingCommand->unreliableSequenceNumber = unreliableSequenceNumber & 0xFFFF;
  2952. incomingCommand->command = *command;
  2953. incomingCommand->fragmentCount = fragmentCount;
  2954. incomingCommand->fragmentsRemaining = fragmentCount;
  2955. incomingCommand->packet = packet;
  2956. incomingCommand->fragments = NULL;
  2957. if (fragmentCount > 0) {
  2958. if (fragmentCount <= ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2959. incomingCommand->fragments = (uint32_t*)enet_malloc((fragmentCount + 31) / 32 * sizeof(uint32_t));
  2960. if (incomingCommand->fragments == NULL) {
  2961. enet_free(incomingCommand);
  2962. goto notifyError;
  2963. }
  2964. memset(incomingCommand->fragments, 0, (fragmentCount + 31) / 32 * sizeof(uint32_t));
  2965. }
  2966. if (packet != NULL) {
  2967. ++packet->referenceCount;
  2968. peer->totalWaitingData += packet->dataLength;
  2969. }
  2970. enet_list_insert(enet_list_next(currentCommand), incomingCommand);
  2971. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2972. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2973. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2974. enet_peer_dispatch_incoming_reliable_commands(peer, channel, incomingCommand);
  2975. break;
  2976. default:
  2977. enet_peer_dispatch_incoming_unreliable_commands(peer, channel, incomingCommand);
  2978. break;
  2979. }
  2980. return incomingCommand;
  2981. discardCommand:
  2982. if (fragmentCount > 0)
  2983. goto notifyError;
  2984. if (packet != NULL && packet->referenceCount == 0)
  2985. enet_packet_destroy(packet);
  2986. return &dummyCommand;
  2987. notifyError:
  2988. if (packet != NULL && packet->referenceCount == 0)
  2989. enet_packet_destroy(packet);
  2990. return NULL;
  2991. }
  2992. /*
  2993. =======================================================================
  2994. Host
  2995. =======================================================================
  2996. */
  2997. ENetHost* enet_host_create(const ENetAddress* address, size_t peerCount, size_t channelLimit, uint32_t incomingBandwidth, uint32_t outgoingBandwidth, int bufferSize) {
  2998. ENetHost* host;
  2999. ENetPeer* currentPeer;
  3000. if (peerCount > ENET_PROTOCOL_MAXIMUM_PEER_ID)
  3001. return NULL;
  3002. host = (ENetHost*)enet_malloc(sizeof(ENetHost));
  3003. if (host == NULL)
  3004. return NULL;
  3005. memset(host, 0, sizeof(ENetHost));
  3006. host->peers = (ENetPeer*)enet_malloc(peerCount * sizeof(ENetPeer));
  3007. if (host->peers == NULL) {
  3008. enet_free(host);
  3009. return NULL;
  3010. }
  3011. memset(host->peers, 0, peerCount * sizeof(ENetPeer));
  3012. host->socket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
  3013. if (host->socket != ENET_SOCKET_NULL)
  3014. enet_socket_set_option(host->socket, ENET_SOCKOPT_IPV6_V6ONLY, 0);
  3015. if (host->socket == ENET_SOCKET_NULL || (address != NULL && enet_socket_bind(host->socket, address) < 0)) {
  3016. if (host->socket != ENET_SOCKET_NULL)
  3017. enet_socket_destroy(host->socket);
  3018. enet_free(host->peers);
  3019. enet_free(host);
  3020. return NULL;
  3021. }
  3022. if (bufferSize > ENET_HOST_BUFFER_SIZE_MAX)
  3023. bufferSize = ENET_HOST_BUFFER_SIZE_MAX;
  3024. else if (bufferSize < ENET_HOST_BUFFER_SIZE_MIN)
  3025. bufferSize = ENET_HOST_BUFFER_SIZE_MIN;
  3026. enet_socket_set_option(host->socket, ENET_SOCKOPT_NONBLOCK, 1);
  3027. enet_socket_set_option(host->socket, ENET_SOCKOPT_BROADCAST, 1);
  3028. enet_socket_set_option(host->socket, ENET_SOCKOPT_RCVBUF, bufferSize);
  3029. enet_socket_set_option(host->socket, ENET_SOCKOPT_SNDBUF, bufferSize);
  3030. if (address != NULL && enet_socket_get_address(host->socket, &host->address) < 0)
  3031. host->address = *address;
  3032. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3033. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3034. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3035. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3036. host->randomSeed = (uint32_t)(size_t)host;
  3037. host->randomSeed += enet_host_random_seed();
  3038. host->randomSeed = (host->randomSeed << 16) | (host->randomSeed >> 16);
  3039. host->channelLimit = channelLimit;
  3040. host->incomingBandwidth = incomingBandwidth;
  3041. host->outgoingBandwidth = outgoingBandwidth;
  3042. host->bandwidthThrottleEpoch = 0;
  3043. host->recalculateBandwidthLimits = 0;
  3044. host->preventConnections = 0;
  3045. host->mtu = ENET_HOST_DEFAULT_MTU;
  3046. host->peerCount = peerCount;
  3047. host->commandCount = 0;
  3048. host->bufferCount = 0;
  3049. host->checksumCallback = NULL;
  3050. host->receivedAddress.ipv6 = ENET_HOST_ANY;
  3051. host->receivedAddress.port = 0;
  3052. host->receivedData = NULL;
  3053. host->receivedDataLength = 0;
  3054. host->totalSentData = 0;
  3055. host->totalSentPackets = 0;
  3056. host->totalReceivedData = 0;
  3057. host->totalReceivedPackets = 0;
  3058. host->totalQueued = 0;
  3059. host->connectedPeers = 0;
  3060. host->bandwidthLimitedPeers = 0;
  3061. host->duplicatePeers = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  3062. host->maximumPacketSize = ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE;
  3063. host->maximumWaitingData = ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA;
  3064. host->interceptCallback = NULL;
  3065. enet_list_clear(&host->dispatchQueue);
  3066. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3067. currentPeer->host = host;
  3068. currentPeer->incomingPeerID = currentPeer - host->peers;
  3069. currentPeer->outgoingSessionID = currentPeer->incomingSessionID = 0xFF;
  3070. currentPeer->data = NULL;
  3071. enet_list_clear(&currentPeer->acknowledgements);
  3072. enet_list_clear(&currentPeer->sentReliableCommands);
  3073. enet_list_clear(&currentPeer->outgoingCommands);
  3074. enet_list_clear(&currentPeer->outgoingSendReliableCommands);
  3075. enet_list_clear(&currentPeer->dispatchedCommands);
  3076. enet_peer_reset(currentPeer);
  3077. }
  3078. return host;
  3079. }
  3080. void enet_host_destroy(ENetHost* host) {
  3081. ENetPeer* currentPeer;
  3082. if (host == NULL)
  3083. return;
  3084. enet_socket_destroy(host->socket);
  3085. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3086. enet_peer_reset(currentPeer);
  3087. }
  3088. enet_free(host->peers);
  3089. enet_free(host);
  3090. }
  3091. void enet_host_prevent_connections(ENetHost* host, uint8_t state) {
  3092. if (host == NULL)
  3093. return;
  3094. host->preventConnections = state;
  3095. }
  3096. ENetPeer* enet_host_connect(ENetHost* host, const ENetAddress* address, size_t channelCount, uint32_t data) {
  3097. ENetPeer* currentPeer;
  3098. ENetChannel* channel;
  3099. ENetProtocol command;
  3100. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3101. channelCount = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3102. else if (channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3103. channelCount = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3104. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3105. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED)
  3106. break;
  3107. }
  3108. if (currentPeer >= &host->peers[host->peerCount])
  3109. return NULL;
  3110. currentPeer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  3111. if (currentPeer->channels == NULL)
  3112. return NULL;
  3113. currentPeer->channelCount = channelCount;
  3114. currentPeer->state = ENET_PEER_STATE_CONNECTING;
  3115. currentPeer->address = *address;
  3116. currentPeer->connectID = ++host->randomSeed;
  3117. if (host->outgoingBandwidth == 0)
  3118. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3119. else
  3120. currentPeer->windowSize = (host->outgoingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3121. if (currentPeer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  3122. currentPeer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3123. else if (currentPeer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  3124. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3125. for (channel = currentPeer->channels; channel < &currentPeer->channels[channelCount]; ++channel) {
  3126. channel->outgoingReliableSequenceNumber = 0;
  3127. channel->outgoingUnreliableSequenceNumber = 0;
  3128. channel->incomingReliableSequenceNumber = 0;
  3129. channel->incomingUnreliableSequenceNumber = 0;
  3130. enet_list_clear(&channel->incomingReliableCommands);
  3131. enet_list_clear(&channel->incomingUnreliableCommands);
  3132. channel->usedReliableWindows = 0;
  3133. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  3134. }
  3135. command.header.command = ENET_PROTOCOL_COMMAND_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3136. command.header.channelID = 0xFF;
  3137. command.connect.outgoingPeerID = ENET_HOST_TO_NET_16(currentPeer->incomingPeerID);
  3138. command.connect.incomingSessionID = currentPeer->incomingSessionID;
  3139. command.connect.outgoingSessionID = currentPeer->outgoingSessionID;
  3140. command.connect.mtu = ENET_HOST_TO_NET_32(currentPeer->mtu);
  3141. command.connect.windowSize = ENET_HOST_TO_NET_32(currentPeer->windowSize);
  3142. command.connect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  3143. command.connect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  3144. command.connect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3145. command.connect.packetThrottleInterval = ENET_HOST_TO_NET_32(currentPeer->packetThrottleInterval);
  3146. command.connect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleAcceleration);
  3147. command.connect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleDeceleration);
  3148. command.connect.connectID = currentPeer->connectID;
  3149. command.connect.data = ENET_HOST_TO_NET_32(data);
  3150. enet_peer_queue_outgoing_command(currentPeer, &command, NULL, 0, 0);
  3151. return currentPeer;
  3152. }
  3153. void enet_host_broadcast(ENetHost* host, uint8_t channelID, ENetPacket* packet) {
  3154. ENetPeer* currentPeer;
  3155. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3156. ++packet->referenceCount;
  3157. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3158. if (currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3159. continue;
  3160. enet_peer_send(currentPeer, channelID, packet);
  3161. }
  3162. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3163. --packet->referenceCount;
  3164. if (packet->referenceCount == 0)
  3165. enet_packet_destroy(packet);
  3166. }
  3167. void enet_host_broadcast_exclude(ENetHost* host, uint8_t channelID, ENetPacket* packet, ENetPeer* excludedPeer) {
  3168. ENetPeer* currentPeer;
  3169. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3170. ++packet->referenceCount;
  3171. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3172. if (currentPeer->state != ENET_PEER_STATE_CONNECTED || currentPeer == excludedPeer)
  3173. continue;
  3174. enet_peer_send(currentPeer, channelID, packet);
  3175. }
  3176. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3177. --packet->referenceCount;
  3178. if (packet->referenceCount == 0)
  3179. enet_packet_destroy(packet);
  3180. }
  3181. void enet_host_broadcast_selective(ENetHost* host, uint8_t channelID, ENetPacket* packet, ENetPeer** peers, size_t length) {
  3182. ENetPeer* currentPeer;
  3183. size_t i;
  3184. if (host == NULL)
  3185. return;
  3186. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3187. ++packet->referenceCount;
  3188. for (i = 0; i < length; i++) {
  3189. currentPeer = peers[i];
  3190. if (currentPeer == NULL || currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3191. continue;
  3192. enet_peer_send(currentPeer, channelID, packet);
  3193. }
  3194. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3195. --packet->referenceCount;
  3196. if (packet->referenceCount == 0)
  3197. enet_packet_destroy(packet);
  3198. }
  3199. void enet_host_channel_limit(ENetHost* host, size_t channelLimit) {
  3200. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3201. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3202. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3203. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3204. host->channelLimit = channelLimit;
  3205. }
  3206. void enet_host_bandwidth_limit(ENetHost* host, uint32_t incomingBandwidth, uint32_t outgoingBandwidth) {
  3207. host->incomingBandwidth = incomingBandwidth;
  3208. host->outgoingBandwidth = outgoingBandwidth;
  3209. host->recalculateBandwidthLimits = 1;
  3210. }
  3211. void enet_host_bandwidth_throttle(ENetHost* host) {
  3212. uint32_t timeCurrent = enet_time_get();
  3213. uint32_t elapsedTime = timeCurrent - host->bandwidthThrottleEpoch;
  3214. uint32_t peersRemaining = (uint32_t)host->connectedPeers;
  3215. uint32_t dataTotal = ~0;
  3216. uint32_t bandwidth = ~0;
  3217. uint32_t throttle = 0;
  3218. uint32_t bandwidthLimit = 0;
  3219. int needsAdjustment = host->bandwidthLimitedPeers > 0 ? 1 : 0;
  3220. ENetPeer* peer;
  3221. ENetProtocol command;
  3222. if (elapsedTime < ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  3223. return;
  3224. if (host->outgoingBandwidth == 0 && host->incomingBandwidth == 0)
  3225. return;
  3226. host->bandwidthThrottleEpoch = timeCurrent;
  3227. if (peersRemaining == 0)
  3228. return;
  3229. if (host->outgoingBandwidth != 0) {
  3230. dataTotal = 0;
  3231. bandwidth = (host->outgoingBandwidth * elapsedTime) / 1000;
  3232. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3233. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3234. continue;
  3235. dataTotal += peer->outgoingDataTotal;
  3236. }
  3237. }
  3238. while (peersRemaining > 0 && needsAdjustment != 0) {
  3239. needsAdjustment = 0;
  3240. if (dataTotal <= bandwidth)
  3241. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3242. else
  3243. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3244. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3245. uint32_t peerBandwidth;
  3246. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidth == 0 || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3247. continue;
  3248. peerBandwidth = (peer->incomingBandwidth * elapsedTime) / 1000;
  3249. if ((throttle * peer->outgoingDataTotal) / ENET_PEER_PACKET_THROTTLE_SCALE <= peerBandwidth)
  3250. continue;
  3251. peer->packetThrottleLimit = (peerBandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / peer->outgoingDataTotal;
  3252. if (peer->packetThrottleLimit == 0)
  3253. peer->packetThrottleLimit = 1;
  3254. if (peer->packetThrottle > peer->packetThrottleLimit)
  3255. peer->packetThrottle = peer->packetThrottleLimit;
  3256. peer->outgoingBandwidthThrottleEpoch = timeCurrent;
  3257. peer->incomingDataTotal = 0;
  3258. peer->outgoingDataTotal = 0;
  3259. needsAdjustment = 1;
  3260. --peersRemaining;
  3261. bandwidth -= peerBandwidth;
  3262. dataTotal -= peerBandwidth;
  3263. }
  3264. }
  3265. if (peersRemaining > 0) {
  3266. if (dataTotal <= bandwidth)
  3267. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3268. else
  3269. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3270. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3271. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3272. continue;
  3273. peer->packetThrottleLimit = throttle;
  3274. if (peer->packetThrottle > peer->packetThrottleLimit)
  3275. peer->packetThrottle = peer->packetThrottleLimit;
  3276. peer->incomingDataTotal = 0;
  3277. peer->outgoingDataTotal = 0;
  3278. }
  3279. }
  3280. if (host->recalculateBandwidthLimits) {
  3281. host->recalculateBandwidthLimits = 0;
  3282. peersRemaining = (uint32_t)host->connectedPeers;
  3283. bandwidth = host->incomingBandwidth;
  3284. needsAdjustment = 1;
  3285. if (bandwidth == 0) {
  3286. bandwidthLimit = 0;
  3287. } else {
  3288. while (peersRemaining > 0 && needsAdjustment != 0) {
  3289. needsAdjustment = 0;
  3290. bandwidthLimit = bandwidth / peersRemaining;
  3291. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3292. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3293. continue;
  3294. if (peer->outgoingBandwidth > 0 && peer->outgoingBandwidth >= bandwidthLimit)
  3295. continue;
  3296. peer->incomingBandwidthThrottleEpoch = timeCurrent;
  3297. needsAdjustment = 1;
  3298. --peersRemaining;
  3299. bandwidth -= peer->outgoingBandwidth;
  3300. }
  3301. }
  3302. }
  3303. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3304. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3305. continue;
  3306. command.header.command = ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3307. command.header.channelID = 0xFF;
  3308. command.bandwidthLimit.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3309. if (peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3310. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(peer->outgoingBandwidth);
  3311. else
  3312. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(bandwidthLimit);
  3313. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  3314. }
  3315. }
  3316. }
  3317. /*
  3318. =======================================================================
  3319. Address
  3320. =======================================================================
  3321. */
  3322. int enet_address_set_ip(ENetAddress* address, const char* ip) {
  3323. int type = AF_INET6;
  3324. void* destination = &address->ipv6;
  3325. if (strchr(ip, ':') == NULL) {
  3326. type = AF_INET;
  3327. memset(address, 0, sizeof(address->ipv4.zeros));
  3328. address->ipv4.ffff = 0xFFFF;
  3329. destination = &address->ipv4.ip;
  3330. }
  3331. if (!inet_pton(type, ip, destination))
  3332. return -1;
  3333. return 0;
  3334. }
  3335. int enet_address_set_hostname(ENetAddress* address, const char* name) {
  3336. struct addrinfo hints, *resultList = NULL, *result = NULL;
  3337. memset(&hints, 0, sizeof(hints));
  3338. hints.ai_family = AF_UNSPEC;
  3339. if (getaddrinfo(name, NULL, &hints, &resultList) != 0)
  3340. return -1;
  3341. for (result = resultList; result != NULL; result = result->ai_next) {
  3342. if (result->ai_addr != NULL && result->ai_addrlen >= sizeof(struct sockaddr_in)) {
  3343. if (result->ai_family == AF_INET) {
  3344. struct sockaddr_in* sin = (struct sockaddr_in*)result->ai_addr;
  3345. memset(address, 0, sizeof(address->ipv4.zeros));
  3346. address->ipv4.ffff = 0xFFFF;
  3347. address->ipv4.ip.s_addr = sin->sin_addr.s_addr;
  3348. freeaddrinfo(resultList);
  3349. return 0;
  3350. } else if (result->ai_family == AF_INET6) {
  3351. struct sockaddr_in6* sin = (struct sockaddr_in6*)result->ai_addr;
  3352. address->ipv6 = sin->sin6_addr;
  3353. freeaddrinfo(resultList);
  3354. return 0;
  3355. }
  3356. }
  3357. }
  3358. if (resultList != NULL)
  3359. freeaddrinfo(resultList);
  3360. return enet_address_set_ip(address, name);
  3361. }
  3362. int enet_address_get_ip(const ENetAddress* address, char* ip, size_t ipLength) {
  3363. if (address->ipv4.ffff == 0xFFFF && enet_array_is_zeroed(address->ipv4.zeros, sizeof(address->ipv4.zeros)) == 0) {
  3364. if (inet_ntop(AF_INET, &address->ipv4.ip, ip, ipLength) == NULL)
  3365. return -1;
  3366. } else if (inet_ntop(AF_INET6, &address->ipv6, ip, ipLength) == NULL) {
  3367. return -1;
  3368. }
  3369. return 0;
  3370. }
  3371. int enet_address_get_hostname(const ENetAddress* address, char* name, size_t nameLength) {
  3372. struct sockaddr_in6 sin;
  3373. int err;
  3374. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3375. sin.sin6_family = AF_INET6;
  3376. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3377. sin.sin6_addr = address->ipv6;
  3378. err = getnameinfo((struct sockaddr*)&sin, sizeof(sin), name, nameLength, NULL, 0, NI_NAMEREQD);
  3379. if (!err) {
  3380. if (name != NULL && nameLength > 0 && !memchr(name, '\0', nameLength))
  3381. return -1;
  3382. return 0;
  3383. }
  3384. if (err != EAI_NONAME)
  3385. return -1;
  3386. return enet_address_get_ip(address, name, nameLength);
  3387. }
  3388. /*
  3389. =======================================================================
  3390. Platform-specific (Unix)
  3391. =======================================================================
  3392. */
  3393. #ifndef _WIN32
  3394. int enet_initialize(void) {
  3395. return 0;
  3396. }
  3397. void enet_deinitialize(void) { }
  3398. uint64_t enet_host_random_seed(void) {
  3399. struct timeval timeVal;
  3400. gettimeofday(&timeVal, NULL);
  3401. return (timeVal.tv_sec * 1000) ^ (timeVal.tv_usec / 1000);
  3402. }
  3403. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3404. struct sockaddr_in6 sin;
  3405. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3406. sin.sin6_family = AF_INET6;
  3407. if (address != NULL) {
  3408. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3409. sin.sin6_addr = address->ipv6;
  3410. } else {
  3411. sin.sin6_port = 0;
  3412. sin.sin6_addr = ENET_HOST_ANY;
  3413. }
  3414. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3415. }
  3416. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3417. struct sockaddr_storage ss;
  3418. socklen_t saLength = sizeof(ss);
  3419. if (getsockname(socket, (struct sockaddr*)&ss, &saLength) == -1)
  3420. return -1;
  3421. if (ss.ss_family == AF_INET) {
  3422. struct sockaddr_in* sin = (struct sockaddr_in*)&ss;
  3423. memset(address, 0, sizeof(address->ipv4.zeros));
  3424. address->ipv4.ffff = 0xFFFF;
  3425. address->ipv4.ip = sin->sin_addr;
  3426. address->port = ENET_NET_TO_HOST_16(sin->sin_port);
  3427. } else if (ss.ss_family == AF_INET6) {
  3428. struct sockaddr_in6* sin = (struct sockaddr_in6*)&ss;
  3429. address->ipv6 = sin->sin6_addr;
  3430. address->port = ENET_NET_TO_HOST_16(sin->sin6_port);
  3431. }
  3432. return 0;
  3433. }
  3434. int enet_socket_listen(ENetSocket socket, int backlog) {
  3435. return listen(socket, backlog < 0 ? SOMAXCONN : backlog);
  3436. }
  3437. ENetSocket enet_socket_create(ENetSocketType type) {
  3438. int socketType = (type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM);
  3439. #ifdef SOCK_CLOEXEC
  3440. socketType |= SOCK_CLOEXEC;
  3441. #endif
  3442. return socket(PF_INET6, socketType, 0);
  3443. }
  3444. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3445. int result = -1;
  3446. switch (option) {
  3447. case ENET_SOCKOPT_NONBLOCK:
  3448. result = fcntl(socket, F_SETFL, (value ? O_NONBLOCK : 0) | (fcntl(socket, F_GETFL) & ~O_NONBLOCK));
  3449. break;
  3450. case ENET_SOCKOPT_BROADCAST:
  3451. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3452. break;
  3453. case ENET_SOCKOPT_REUSEADDR:
  3454. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3455. break;
  3456. case ENET_SOCKOPT_RCVBUF:
  3457. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3458. break;
  3459. case ENET_SOCKOPT_SNDBUF:
  3460. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3461. break;
  3462. case ENET_SOCKOPT_RCVTIMEO: {
  3463. struct timeval timeVal;
  3464. timeVal.tv_sec = value / 1000;
  3465. timeVal.tv_usec = (value % 1000) * 1000;
  3466. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3467. break;
  3468. }
  3469. case ENET_SOCKOPT_SNDTIMEO: {
  3470. struct timeval timeVal;
  3471. timeVal.tv_sec = value / 1000;
  3472. timeVal.tv_usec = (value % 1000) * 1000;
  3473. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3474. break;
  3475. }
  3476. case ENET_SOCKOPT_NODELAY:
  3477. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3478. break;
  3479. case ENET_SOCKOPT_IPV6_V6ONLY:
  3480. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3481. break;
  3482. case ENET_SOCKOPT_TTL:
  3483. result = setsockopt(socket, IPPROTO_IP, IP_TTL, (char*)&value, sizeof(int));
  3484. break;
  3485. default:
  3486. break;
  3487. }
  3488. return result == -1 ? -1 : 0;
  3489. }
  3490. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3491. int result = -1;
  3492. socklen_t len;
  3493. switch (option) {
  3494. case ENET_SOCKOPT_ERROR:
  3495. len = sizeof(int);
  3496. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, value, &len);
  3497. break;
  3498. case ENET_SOCKOPT_TTL:
  3499. len = sizeof(int);
  3500. result = getsockopt(socket, IPPROTO_IP, IP_TTL, (char*)value, &len);
  3501. break;
  3502. default:
  3503. break;
  3504. }
  3505. return result == -1 ? -1 : 0;
  3506. }
  3507. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3508. int result = -1;
  3509. struct sockaddr_in6 sin;
  3510. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3511. sin.sin6_family = AF_INET6;
  3512. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3513. sin.sin6_addr = address->ipv6;
  3514. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3515. if (result == -1 && errno == EINPROGRESS)
  3516. return 0;
  3517. return result;
  3518. }
  3519. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3520. int result = -1;
  3521. struct sockaddr_in6 sin;
  3522. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3523. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3524. if (result == -1)
  3525. return ENET_SOCKET_NULL;
  3526. if (address != NULL) {
  3527. address->ipv6 = sin.sin6_addr;
  3528. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3529. }
  3530. return result;
  3531. }
  3532. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3533. return shutdown(socket, (int)how);
  3534. }
  3535. void enet_socket_destroy(ENetSocket socket) {
  3536. if (socket != ENET_SOCKET_NULL)
  3537. close(socket);
  3538. }
  3539. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3540. struct msghdr msgHdr;
  3541. struct sockaddr_in6 sin;
  3542. int sentLength;
  3543. memset(&msgHdr, 0, sizeof(struct msghdr));
  3544. if (address != NULL) {
  3545. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3546. sin.sin6_family = AF_INET6;
  3547. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3548. sin.sin6_addr = address->ipv6;
  3549. msgHdr.msg_name = &sin;
  3550. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3551. }
  3552. msgHdr.msg_iov = (struct iovec*)buffers;
  3553. msgHdr.msg_iovlen = bufferCount;
  3554. sentLength = sendmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3555. if (sentLength == -1) {
  3556. if (errno == EWOULDBLOCK)
  3557. return 0;
  3558. return -1;
  3559. }
  3560. return sentLength;
  3561. }
  3562. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3563. struct msghdr msgHdr;
  3564. struct sockaddr_in6 sin;
  3565. int recvLength;
  3566. memset(&msgHdr, 0, sizeof(struct msghdr));
  3567. if (address != NULL) {
  3568. msgHdr.msg_name = &sin;
  3569. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3570. }
  3571. msgHdr.msg_iov = (struct iovec*)buffers;
  3572. msgHdr.msg_iovlen = bufferCount;
  3573. recvLength = recvmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3574. if (recvLength == -1) {
  3575. if (errno == EWOULDBLOCK)
  3576. return 0;
  3577. return -1;
  3578. }
  3579. if (msgHdr.msg_flags & MSG_TRUNC)
  3580. return -2;
  3581. if (address != NULL) {
  3582. address->ipv6 = sin.sin6_addr;
  3583. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3584. }
  3585. return recvLength;
  3586. }
  3587. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, uint32_t timeout) {
  3588. struct timeval timeVal;
  3589. timeVal.tv_sec = timeout / 1000;
  3590. timeVal.tv_usec = (timeout % 1000) * 1000;
  3591. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3592. }
  3593. int enet_socket_wait(ENetSocket socket, uint32_t* condition, uint64_t timeout) {
  3594. struct pollfd pollSocket;
  3595. int pollCount;
  3596. pollSocket.fd = socket;
  3597. pollSocket.events = 0;
  3598. if (*condition & ENET_SOCKET_WAIT_SEND)
  3599. pollSocket.events |= POLLOUT;
  3600. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3601. pollSocket.events |= POLLIN;
  3602. pollCount = poll(&pollSocket, 1, timeout);
  3603. if (pollCount < 0) {
  3604. if (errno == EINTR && *condition & ENET_SOCKET_WAIT_INTERRUPT) {
  3605. *condition = ENET_SOCKET_WAIT_INTERRUPT;
  3606. return 0;
  3607. }
  3608. return -1;
  3609. }
  3610. *condition = ENET_SOCKET_WAIT_NONE;
  3611. if (pollCount == 0)
  3612. return 0;
  3613. if (pollSocket.revents & POLLOUT)
  3614. *condition |= ENET_SOCKET_WAIT_SEND;
  3615. if (pollSocket.revents & POLLIN)
  3616. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3617. return 0;
  3618. }
  3619. #endif
  3620. /*
  3621. =======================================================================
  3622. Platform-specific (Windows)
  3623. =======================================================================
  3624. */
  3625. #ifdef _WIN32
  3626. int enet_initialize(void) {
  3627. WORD versionRequested = MAKEWORD(2, 2);
  3628. WSADATA wsaData;
  3629. if (WSAStartup(versionRequested, &wsaData))
  3630. return -1;
  3631. if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
  3632. WSACleanup();
  3633. return -1;
  3634. }
  3635. timeBeginPeriod(1);
  3636. return 0;
  3637. }
  3638. void enet_deinitialize(void) {
  3639. timeEndPeriod(1);
  3640. WSACleanup();
  3641. }
  3642. uint64_t enet_host_random_seed(void) {
  3643. return (uint64_t)timeGetTime();
  3644. }
  3645. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3646. struct sockaddr_in6 sin;
  3647. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3648. sin.sin6_family = AF_INET6;
  3649. if (address != NULL) {
  3650. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3651. sin.sin6_addr = address->ipv6;
  3652. } else {
  3653. sin.sin6_port = 0;
  3654. sin.sin6_addr = in6addr_any;
  3655. }
  3656. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)) == SOCKET_ERROR ? -1 : 0;
  3657. }
  3658. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3659. struct sockaddr_storage ss;
  3660. int saLength = sizeof(ss);
  3661. if (getsockname(socket, (struct sockaddr*)&ss, &saLength) == -1)
  3662. return -1;
  3663. if (ss.ss_family == AF_INET) {
  3664. struct sockaddr_in* sin = (struct sockaddr_in*)&ss;
  3665. memset(address, 0, sizeof(address->ipv4.zeros));
  3666. address->ipv4.ffff = 0xFFFF;
  3667. address->ipv4.ip = sin->sin_addr;
  3668. address->port = ENET_NET_TO_HOST_16(sin->sin_port);
  3669. } else if (ss.ss_family == AF_INET6) {
  3670. struct sockaddr_in6* sin = (struct sockaddr_in6*)&ss;
  3671. address->ipv6 = sin->sin6_addr;
  3672. address->port = ENET_NET_TO_HOST_16(sin->sin6_port);
  3673. }
  3674. return 0;
  3675. }
  3676. int enet_socket_listen(ENetSocket socket, int backlog) {
  3677. return listen(socket, backlog < 0 ? SOMAXCONN : backlog) == SOCKET_ERROR ? -1 : 0;
  3678. }
  3679. ENetSocket enet_socket_create(ENetSocketType type) {
  3680. return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
  3681. }
  3682. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3683. int result = SOCKET_ERROR;
  3684. switch (option) {
  3685. case ENET_SOCKOPT_NONBLOCK: {
  3686. u_long nonBlocking = (u_long)value;
  3687. result = ioctlsocket(socket, FIONBIO, &nonBlocking);
  3688. break;
  3689. }
  3690. case ENET_SOCKOPT_BROADCAST:
  3691. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3692. break;
  3693. case ENET_SOCKOPT_REUSEADDR:
  3694. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3695. break;
  3696. case ENET_SOCKOPT_RCVBUF:
  3697. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3698. break;
  3699. case ENET_SOCKOPT_SNDBUF:
  3700. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3701. break;
  3702. case ENET_SOCKOPT_RCVTIMEO:
  3703. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&value, sizeof(int));
  3704. break;
  3705. case ENET_SOCKOPT_SNDTIMEO:
  3706. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&value, sizeof(int));
  3707. break;
  3708. case ENET_SOCKOPT_NODELAY:
  3709. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3710. break;
  3711. case ENET_SOCKOPT_IPV6_V6ONLY:
  3712. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3713. break;
  3714. case ENET_SOCKOPT_TTL:
  3715. result = setsockopt(socket, IPPROTO_IP, IP_TTL, (char*)&value, sizeof(int));
  3716. break;
  3717. default:
  3718. break;
  3719. }
  3720. return result == SOCKET_ERROR ? -1 : 0;
  3721. }
  3722. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3723. int result = SOCKET_ERROR, len;
  3724. switch (option) {
  3725. case ENET_SOCKOPT_ERROR:
  3726. len = sizeof(int);
  3727. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, (char*)value, &len);
  3728. break;
  3729. case ENET_SOCKOPT_TTL:
  3730. len = sizeof(int);
  3731. result = getsockopt(socket, IPPROTO_IP, IP_TTL, (char*)value, &len);
  3732. break;
  3733. default:
  3734. break;
  3735. }
  3736. return result == SOCKET_ERROR ? -1 : 0;
  3737. }
  3738. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3739. int result = -1;
  3740. struct sockaddr_in6 sin;
  3741. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3742. sin.sin6_family = AF_INET6;
  3743. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3744. sin.sin6_addr = address->ipv6;
  3745. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3746. if (result == SOCKET_ERROR && WSAGetLastError() != WSAEWOULDBLOCK)
  3747. return -1;
  3748. return 0;
  3749. }
  3750. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3751. SOCKET result;
  3752. struct sockaddr_in6 sin;
  3753. int sinLength = sizeof(struct sockaddr_in6);
  3754. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3755. if (result == INVALID_SOCKET)
  3756. return ENET_SOCKET_NULL;
  3757. if (address != NULL) {
  3758. address->ipv6 = sin.sin6_addr;
  3759. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3760. }
  3761. return result;
  3762. }
  3763. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3764. return shutdown(socket, (int)how) == SOCKET_ERROR ? -1 : 0;
  3765. }
  3766. void enet_socket_destroy(ENetSocket socket) {
  3767. if (socket != INVALID_SOCKET)
  3768. closesocket(socket);
  3769. }
  3770. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3771. struct sockaddr_in6 sin;
  3772. DWORD sentLength = 0;
  3773. if (address != NULL) {
  3774. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3775. sin.sin6_family = AF_INET6;
  3776. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3777. sin.sin6_addr = address->ipv6;
  3778. }
  3779. 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)
  3780. return (WSAGetLastError() == WSAEWOULDBLOCK) ? 0 : -1;
  3781. return (int)sentLength;
  3782. }
  3783. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3784. INT sinLength = sizeof(struct sockaddr_in6);
  3785. DWORD flags = 0, recvLength = 0;
  3786. struct sockaddr_in6 sin;
  3787. if (WSARecvFrom(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &recvLength, &flags, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL, NULL, NULL) == SOCKET_ERROR) {
  3788. switch (WSAGetLastError()) {
  3789. case WSAEWOULDBLOCK:
  3790. case WSAECONNRESET:
  3791. return 0;
  3792. case WSAEMSGSIZE:
  3793. return -2;
  3794. }
  3795. return -1;
  3796. }
  3797. if (flags & MSG_PARTIAL)
  3798. return -2;
  3799. if (address != NULL) {
  3800. address->ipv6 = sin.sin6_addr;
  3801. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3802. }
  3803. return (int)recvLength;
  3804. }
  3805. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, uint32_t timeout) {
  3806. struct timeval timeVal;
  3807. timeVal.tv_sec = timeout / 1000;
  3808. timeVal.tv_usec = (timeout % 1000) * 1000;
  3809. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3810. }
  3811. int enet_socket_wait(ENetSocket socket, uint32_t* condition, uint64_t timeout) {
  3812. fd_set readSet, writeSet;
  3813. struct timeval timeVal;
  3814. int selectCount;
  3815. timeVal.tv_sec = timeout / 1000;
  3816. timeVal.tv_usec = (timeout % 1000) * 1000;
  3817. FD_ZERO(&readSet);
  3818. FD_ZERO(&writeSet);
  3819. if (*condition & ENET_SOCKET_WAIT_SEND)
  3820. FD_SET(socket, &writeSet);
  3821. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3822. FD_SET(socket, &readSet);
  3823. selectCount = select(socket + 1, &readSet, &writeSet, NULL, &timeVal);
  3824. if (selectCount < 0)
  3825. return -1;
  3826. *condition = ENET_SOCKET_WAIT_NONE;
  3827. if (selectCount == 0)
  3828. return 0;
  3829. if (FD_ISSET(socket, &writeSet))
  3830. *condition |= ENET_SOCKET_WAIT_SEND;
  3831. if (FD_ISSET(socket, &readSet))
  3832. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3833. return 0;
  3834. }
  3835. #endif
  3836. /*
  3837. =======================================================================
  3838. Extended functionality
  3839. =======================================================================
  3840. */
  3841. void* enet_packet_get_data(const ENetPacket* packet) {
  3842. return (void*)packet->data;
  3843. }
  3844. void* enet_packet_get_user_data(const ENetPacket* packet) {
  3845. return packet->userData;
  3846. }
  3847. void enet_packet_set_user_data(ENetPacket* packet, void* userData) {
  3848. packet->userData = userData;
  3849. }
  3850. int enet_packet_get_length(const ENetPacket* packet) {
  3851. return packet->dataLength;
  3852. }
  3853. void enet_packet_set_free_callback(ENetPacket* packet, ENetPacketFreeCallback callback) {
  3854. packet->freeCallback = callback;
  3855. }
  3856. int enet_packet_check_references(const ENetPacket* packet) {
  3857. return (int)packet->referenceCount;
  3858. }
  3859. void enet_packet_dispose(ENetPacket* packet) {
  3860. if (packet->referenceCount == 0)
  3861. enet_packet_destroy(packet);
  3862. }
  3863. uint32_t enet_host_get_peers_count(const ENetHost* host) {
  3864. return host->connectedPeers;
  3865. }
  3866. uint32_t enet_host_get_packets_sent(const ENetHost* host) {
  3867. return host->totalSentPackets;
  3868. }
  3869. uint32_t enet_host_get_packets_received(const ENetHost* host) {
  3870. return host->totalReceivedPackets;
  3871. }
  3872. uint32_t enet_host_get_bytes_sent(const ENetHost* host) {
  3873. return host->totalSentData;
  3874. }
  3875. uint32_t enet_host_get_bytes_received(const ENetHost* host) {
  3876. return host->totalReceivedData;
  3877. }
  3878. void enet_host_set_max_duplicate_peers(ENetHost* host, uint16_t number) {
  3879. if (number < 1)
  3880. number = 1;
  3881. if (number > ENET_PROTOCOL_MAXIMUM_PEER_ID)
  3882. number = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  3883. host->duplicatePeers = number;
  3884. }
  3885. void enet_host_set_intercept_callback(ENetHost* host, ENetInterceptCallback callback) {
  3886. host->interceptCallback = callback;
  3887. }
  3888. void enet_host_set_checksum_callback(ENetHost* host, ENetChecksumCallback callback) {
  3889. host->checksumCallback = callback;
  3890. }
  3891. uint32_t enet_peer_get_id(const ENetPeer* peer) {
  3892. return peer->incomingPeerID;
  3893. }
  3894. int enet_peer_get_ip(const ENetPeer* peer, char* ip, size_t ipLength) {
  3895. return enet_address_get_ip(&peer->address, ip, ipLength);
  3896. }
  3897. uint16_t enet_peer_get_port(const ENetPeer* peer) {
  3898. return peer->address.port;
  3899. }
  3900. uint32_t enet_peer_get_mtu(const ENetPeer* peer) {
  3901. return peer->mtu;
  3902. }
  3903. ENetPeerState enet_peer_get_state(const ENetPeer* peer) {
  3904. return peer->state;
  3905. }
  3906. uint32_t enet_peer_get_rtt(const ENetPeer* peer) {
  3907. return peer->roundTripTime;
  3908. }
  3909. uint32_t enet_peer_get_last_rtt(const ENetPeer* peer) {
  3910. return peer->lastRoundTripTime;
  3911. }
  3912. uint32_t enet_peer_get_lastsendtime(const ENetPeer* peer) {
  3913. return peer->lastSendTime;
  3914. }
  3915. uint32_t enet_peer_get_lastreceivetime(const ENetPeer* peer) {
  3916. return peer->lastReceiveTime;
  3917. }
  3918. uint64_t enet_peer_get_packets_sent(const ENetPeer* peer) {
  3919. return peer->totalPacketsSent;
  3920. }
  3921. uint64_t enet_peer_get_packets_lost(const ENetPeer* peer) {
  3922. return peer->totalPacketsLost;
  3923. }
  3924. float enet_peer_get_packets_throttle(const ENetPeer* peer) {
  3925. return peer->packetThrottle / (float)ENET_PEER_PACKET_THROTTLE_SCALE * 100.0f;
  3926. }
  3927. uint64_t enet_peer_get_bytes_sent(const ENetPeer* peer) {
  3928. return peer->totalDataSent;
  3929. }
  3930. uint64_t enet_peer_get_bytes_received(const ENetPeer* peer) {
  3931. return peer->totalDataReceived;
  3932. }
  3933. void* enet_peer_get_data(const ENetPeer* peer) {
  3934. return (void*)peer->data;
  3935. }
  3936. void enet_peer_set_data(ENetPeer* peer, const void* data) {
  3937. peer->data = (uint32_t*)data;
  3938. }
  3939. #ifdef _MSC_VER
  3940. #pragma warning(pop)
  3941. #endif
  3942. #endif // ENET_IMPLEMENTATION
  3943. #endif // ENET_H