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