enet.h 175 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 <stdarg.h>
  26. #include <stdbool.h>
  27. #include <stdint.h>
  28. #include <stdio.h>
  29. #include <stdlib.h>
  30. #include <time.h>
  31. #define ENET_VERSION_MAJOR 2
  32. #define ENET_VERSION_MINOR 3
  33. #define ENET_VERSION_PATCH 0
  34. #define ENET_VERSION_CREATE(major, minor, patch) (((major) << 16) | ((minor) << 8) | (patch))
  35. #define ENET_VERSION_GET_MAJOR(version) (((version) >> 16) & 0xFF)
  36. #define ENET_VERSION_GET_MINOR(version) (((version) >> 8) & 0xFF)
  37. #define ENET_VERSION_GET_PATCH(version) ((version) & 0xFF)
  38. #define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH)
  39. #define ENET_TIME_OVERFLOW 86400000
  40. #define ENET_TIME_LESS(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW)
  41. #define ENET_TIME_GREATER(a, b) ((b) - (a) >= ENET_TIME_OVERFLOW)
  42. #define ENET_TIME_LESS_EQUAL(a, b) (!ENET_TIME_GREATER(a, b))
  43. #define ENET_TIME_GREATER_EQUAL(a, b) (!ENET_TIME_LESS(a, b))
  44. #define ENET_TIME_DIFFERENCE(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW ? (b) - (a) : (a) - (b))
  45. #define ENET_MAX(x, y) ((x) > (y) ? (x) : (y))
  46. #define ENET_MIN(x, y) ((x) < (y) ? (x) : (y))
  47. #define ENET_SRTT_INITIAL 1.0
  48. #define ENET_SRTT_PARA_G 0.125
  49. static FILE *enet_log_fp = NULL;
  50. enum enet_log_type
  51. {
  52. ENET_LOG_TYPE_TRACE,
  53. ENET_LOG_TYPE_ERROR,
  54. };
  55. static const char *const enet_log_type_names[] = {
  56. [ENET_LOG_TYPE_TRACE] = "TRACE",
  57. [ENET_LOG_TYPE_ERROR] = "ERROR",
  58. };
  59. #if ENET_DEBUG
  60. #define ENET_LOG_TRACE(...) enet_log(ENET_LOG_TYPE_TRACE, __FUNCTION__, __LINE__, __VA_ARGS__)
  61. #define ENET_LOG_ERROR(...) enet_log(ENET_LOG_TYPE_ERROR, __FUNCTION__, __LINE__, __VA_ARGS__)
  62. #else
  63. #define ENET_LOG_TRACE(...) ((void)0)
  64. #define ENET_LOG_ERROR(...) ((void)0)
  65. #endif
  66. #define ENET_LOG_FILE "enet_log.txt"
  67. static inline void enet_log(enum enet_log_type type, const char *func, int line, const char *fmt, ...)
  68. {
  69. if (!enet_log_fp) enet_log_fp = fopen(ENET_LOG_FILE, "a");
  70. if (!enet_log_fp) return;
  71. va_list args;
  72. time_t tstamp = time(NULL);
  73. struct tm *local_time = localtime(&tstamp);
  74. char time_buf[64];
  75. time_buf[strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S", local_time)] = '\0';
  76. fprintf(enet_log_fp, "%s [%s] [%s:%d] ", time_buf, enet_log_type_names[type], func, line);
  77. va_start(args, fmt);
  78. vfprintf(enet_log_fp, fmt, args);
  79. va_end(args);
  80. fflush(enet_log_fp);
  81. }
  82. /*
  83. =======================================================================
  84. System differences
  85. =======================================================================
  86. */
  87. #ifdef _WIN32
  88. #if defined(_MSC_VER) && defined(ENET_IMPLEMENTATION)
  89. #pragma warning(disable: 4244) /* 64-bit to 32-bit integer conversion */
  90. #pragma warning(disable: 4267) /* size_t to integer conversion */
  91. #endif
  92. #ifndef ENET_NO_PRAGMA_LINK
  93. #pragma comment(lib, "ws2_32.lib")
  94. #pragma comment(lib, "winmm.lib")
  95. #endif
  96. #if _MSC_VER >= 1910
  97. /* It looks like there were changes as of Visual Studio 2017 and there are no 32/64 bit
  98. versions of _InterlockedExchange[operation], only InterlockedExchange[operation]
  99. (without leading underscore), so we have to distinguish between compiler versions */
  100. #define NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  101. #endif
  102. #ifdef __GNUC__
  103. #if (_WIN32_WINNT < 0x0501)
  104. #undef _WIN32_WINNT
  105. #define _WIN32_WINNT 0x0501
  106. #endif
  107. #endif
  108. #include <winsock2.h>
  109. #include <ws2tcpip.h>
  110. #include <mmsystem.h>
  111. #include <intrin.h>
  112. #if defined(_WIN32) && defined(_MSC_VER)
  113. #if _MSC_VER < 1900
  114. typedef struct timespec {
  115. long tv_sec;
  116. long tv_nsec;
  117. };
  118. #endif
  119. #define CLOCK_MONOTONIC 0
  120. #endif
  121. typedef SOCKET ENetSocket;
  122. #define ENET_SOCKET_NULL INVALID_SOCKET
  123. typedef struct {
  124. size_t dataLength;
  125. void* data;
  126. } ENetBuffer;
  127. #define ENET_CALLBACK __cdecl
  128. #ifdef ENET_DLL
  129. #ifdef ENET_IMPLEMENTATION
  130. #define ENET_API __declspec(dllexport)
  131. #else
  132. #define ENET_API __declspec(dllimport)
  133. #endif
  134. #else
  135. #define ENET_API extern
  136. #endif
  137. #else
  138. #include <sys/types.h>
  139. #include <sys/ioctl.h>
  140. #include <sys/time.h>
  141. #include <sys/socket.h>
  142. #include <poll.h>
  143. #include <arpa/inet.h>
  144. #include <netinet/in.h>
  145. #include <netinet/tcp.h>
  146. #include <netdb.h>
  147. #include <unistd.h>
  148. #include <string.h>
  149. #include <errno.h>
  150. #include <fcntl.h>
  151. #ifdef __APPLE__
  152. #include <mach/clock.h>
  153. #include <mach/mach.h>
  154. #include <Availability.h>
  155. #endif
  156. #ifndef MSG_NOSIGNAL
  157. #define MSG_NOSIGNAL 0
  158. #endif
  159. #ifdef MSG_MAXIOVLEN
  160. #define ENET_BUFFER_MAXIMUM MSG_MAXIOVLEN
  161. #endif
  162. typedef int ENetSocket;
  163. #define ENET_SOCKET_NULL -1
  164. typedef struct {
  165. void* data;
  166. size_t dataLength;
  167. } ENetBuffer;
  168. #define ENET_CALLBACK
  169. #define ENET_API extern
  170. #endif
  171. #ifndef ENET_BUFFER_MAXIMUM
  172. #define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS)
  173. #endif
  174. #define ENET_HOST_ANY in6addr_any
  175. #define ENET_PORT_ANY 0
  176. #define ENET_HOST_SIZE 1025
  177. #define ENET_HOST_TO_NET_16(value) (htons(value))
  178. #define ENET_HOST_TO_NET_32(value) (htonl(value))
  179. #define ENET_NET_TO_HOST_16(value) (ntohs(value))
  180. #define ENET_NET_TO_HOST_32(value) (ntohl(value))
  181. #ifdef __cplusplus
  182. extern "C" {
  183. #endif
  184. /*
  185. =======================================================================
  186. Internals
  187. =======================================================================
  188. */
  189. typedef uint8_t enet_uint8;
  190. typedef uint16_t enet_uint16;
  191. typedef uint32_t enet_uint32;
  192. typedef uint64_t enet_uint64;
  193. typedef enet_uint32 ENetVersion;
  194. typedef fd_set ENetSocketSet;
  195. typedef struct _ENetCallbacks {
  196. void* (ENET_CALLBACK *malloc)(size_t size);
  197. void (ENET_CALLBACK *free)(void* memory);
  198. void (ENET_CALLBACK *noMemory)(void);
  199. } ENetCallbacks;
  200. extern void* enet_malloc(size_t);
  201. extern void enet_free(void*);
  202. typedef struct _ENetListNode {
  203. struct _ENetListNode* next;
  204. struct _ENetListNode* previous;
  205. } ENetListNode;
  206. typedef ENetListNode* ENetListIterator;
  207. typedef struct _ENetList {
  208. ENetListNode sentinel;
  209. } ENetList;
  210. extern ENetListIterator enet_list_insert(ENetListIterator, void*);
  211. extern ENetListIterator enet_list_move(ENetListIterator, void*, void*);
  212. extern void* enet_list_remove(ENetListIterator);
  213. extern void enet_list_clear(ENetList*);
  214. extern size_t enet_list_size(ENetList*);
  215. #define enet_list_begin(list) ((list)->sentinel.next)
  216. #define enet_list_end(list) (&(list)->sentinel)
  217. #define enet_list_empty(list) (enet_list_begin(list) == enet_list_end(list))
  218. #define enet_list_next(iterator) ((iterator)->next)
  219. #define enet_list_previous(iterator) ((iterator)->previous)
  220. #define enet_list_front(list) ((void*)(list)->sentinel.next)
  221. #define enet_list_back(list) ((void*)(list)->sentinel.previous)
  222. #ifndef IN4ADDR
  223. #define IN4ADDR
  224. struct in4_addr {
  225. uint8_t zeros[10];
  226. uint16_t ffff;
  227. struct in_addr ip;
  228. };
  229. #endif
  230. /*
  231. =======================================================================
  232. Protocol
  233. =======================================================================
  234. */
  235. enum {
  236. ENET_PROTOCOL_MINIMUM_MTU = 576,
  237. ENET_PROTOCOL_MAXIMUM_MTU = 4096,
  238. ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS = 32,
  239. ENET_PROTOCOL_MINIMUM_WINDOW_SIZE = 4096,
  240. ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE = 65536,
  241. ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT = 1,
  242. ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT = 255,
  243. ENET_PROTOCOL_MAXIMUM_PEER_ID = 0xFFF,
  244. ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT = 1024 * 1024
  245. };
  246. typedef enum _ENetProtocolCommand {
  247. ENET_PROTOCOL_COMMAND_NONE = 0,
  248. ENET_PROTOCOL_COMMAND_ACKNOWLEDGE = 1,
  249. ENET_PROTOCOL_COMMAND_CONNECT = 2,
  250. ENET_PROTOCOL_COMMAND_VERIFY_CONNECT = 3,
  251. ENET_PROTOCOL_COMMAND_DISCONNECT = 4,
  252. ENET_PROTOCOL_COMMAND_PING = 5,
  253. ENET_PROTOCOL_COMMAND_SEND_RELIABLE = 6,
  254. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE = 7,
  255. ENET_PROTOCOL_COMMAND_SEND_FRAGMENT = 8,
  256. ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED = 9,
  257. ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT = 10,
  258. ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE = 11,
  259. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT = 12,
  260. ENET_PROTOCOL_COMMAND_COUNT = 13,
  261. ENET_PROTOCOL_COMMAND_MASK = 0x0F
  262. } ENetProtocolCommand;
  263. typedef enum _ENetProtocolFlag {
  264. ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE = (1 << 7),
  265. ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED = (1 << 6),
  266. ENET_PROTOCOL_HEADER_FLAG_SENT_TIME = (1 << 14),
  267. ENET_PROTOCOL_HEADER_FLAG_COMPRESSED = (1 << 15),
  268. ENET_PROTOCOL_HEADER_FLAG_MASK = ENET_PROTOCOL_HEADER_FLAG_SENT_TIME | ENET_PROTOCOL_HEADER_FLAG_COMPRESSED,
  269. ENET_PROTOCOL_HEADER_SESSION_MASK = (3 << 12),
  270. ENET_PROTOCOL_HEADER_SESSION_SHIFT = 12
  271. } ENetProtocolFlag;
  272. #ifdef _MSC_VER
  273. #pragma pack(push, 1)
  274. #define ENET_PACKED
  275. #elif defined(__GNUC__) || defined(__clang__)
  276. #define ENET_PACKED __attribute__ ((packed))
  277. #else
  278. #define ENET_PACKED
  279. #endif
  280. typedef struct _ENetProtocolHeader {
  281. enet_uint16 peerID;
  282. enet_uint16 sentTime;
  283. } ENET_PACKED ENetProtocolHeader;
  284. typedef struct _ENetProtocolCommandHeader {
  285. enet_uint8 command;
  286. enet_uint8 channelID;
  287. enet_uint16 reliableSequenceNumber;
  288. } ENET_PACKED ENetProtocolCommandHeader;
  289. typedef struct _ENetProtocolAcknowledge {
  290. ENetProtocolCommandHeader header;
  291. enet_uint16 receivedReliableSequenceNumber;
  292. enet_uint16 receivedSentTime;
  293. } ENET_PACKED ENetProtocolAcknowledge;
  294. typedef struct _ENetProtocolConnect {
  295. ENetProtocolCommandHeader header;
  296. enet_uint16 outgoingPeerID;
  297. enet_uint8 incomingSessionID;
  298. enet_uint8 outgoingSessionID;
  299. enet_uint32 mtu;
  300. enet_uint32 windowSize;
  301. enet_uint32 channelCount;
  302. enet_uint32 incomingBandwidth;
  303. enet_uint32 outgoingBandwidth;
  304. enet_uint32 packetThrottleInterval;
  305. enet_uint32 packetThrottleAcceleration;
  306. enet_uint32 packetThrottleDeceleration;
  307. enet_uint32 connectID;
  308. enet_uint32 data;
  309. } ENET_PACKED ENetProtocolConnect;
  310. typedef struct _ENetProtocolVerifyConnect {
  311. ENetProtocolCommandHeader header;
  312. enet_uint16 outgoingPeerID;
  313. enet_uint8 incomingSessionID;
  314. enet_uint8 outgoingSessionID;
  315. enet_uint32 mtu;
  316. enet_uint32 windowSize;
  317. enet_uint32 channelCount;
  318. enet_uint32 incomingBandwidth;
  319. enet_uint32 outgoingBandwidth;
  320. enet_uint32 packetThrottleInterval;
  321. enet_uint32 packetThrottleAcceleration;
  322. enet_uint32 packetThrottleDeceleration;
  323. enet_uint32 connectID;
  324. } ENET_PACKED ENetProtocolVerifyConnect;
  325. typedef struct _ENetProtocolBandwidthLimit {
  326. ENetProtocolCommandHeader header;
  327. enet_uint32 incomingBandwidth;
  328. enet_uint32 outgoingBandwidth;
  329. } ENET_PACKED ENetProtocolBandwidthLimit;
  330. typedef struct _ENetProtocolThrottleConfigure {
  331. ENetProtocolCommandHeader header;
  332. enet_uint32 packetThrottleInterval;
  333. enet_uint32 packetThrottleAcceleration;
  334. enet_uint32 packetThrottleDeceleration;
  335. } ENET_PACKED ENetProtocolThrottleConfigure;
  336. typedef struct _ENetProtocolDisconnect {
  337. ENetProtocolCommandHeader header;
  338. enet_uint32 data;
  339. } ENET_PACKED ENetProtocolDisconnect;
  340. typedef struct _ENetProtocolPing {
  341. ENetProtocolCommandHeader header;
  342. } ENET_PACKED ENetProtocolPing;
  343. typedef struct _ENetProtocolSendReliable {
  344. ENetProtocolCommandHeader header;
  345. enet_uint16 dataLength;
  346. } ENET_PACKED ENetProtocolSendReliable;
  347. typedef struct _ENetProtocolSendUnreliable {
  348. ENetProtocolCommandHeader header;
  349. enet_uint16 unreliableSequenceNumber;
  350. enet_uint16 dataLength;
  351. } ENET_PACKED ENetProtocolSendUnreliable;
  352. typedef struct _ENetProtocolSendUnsequenced {
  353. ENetProtocolCommandHeader header;
  354. enet_uint16 unsequencedGroup;
  355. enet_uint16 dataLength;
  356. } ENET_PACKED ENetProtocolSendUnsequenced;
  357. typedef struct _ENetProtocolSendFragment {
  358. ENetProtocolCommandHeader header;
  359. enet_uint16 startSequenceNumber;
  360. enet_uint16 dataLength;
  361. enet_uint32 fragmentCount;
  362. enet_uint32 fragmentNumber;
  363. enet_uint32 totalLength;
  364. enet_uint32 fragmentOffset;
  365. } ENET_PACKED ENetProtocolSendFragment;
  366. typedef union _ENetProtocol {
  367. ENetProtocolCommandHeader header;
  368. ENetProtocolAcknowledge acknowledge;
  369. ENetProtocolConnect connect;
  370. ENetProtocolVerifyConnect verifyConnect;
  371. ENetProtocolDisconnect disconnect;
  372. ENetProtocolPing ping;
  373. ENetProtocolSendReliable sendReliable;
  374. ENetProtocolSendUnreliable sendUnreliable;
  375. ENetProtocolSendUnsequenced sendUnsequenced;
  376. ENetProtocolSendFragment sendFragment;
  377. ENetProtocolBandwidthLimit bandwidthLimit;
  378. ENetProtocolThrottleConfigure throttleConfigure;
  379. } ENET_PACKED ENetProtocol;
  380. #ifdef _MSC_VER
  381. #pragma pack(pop)
  382. #endif
  383. /*
  384. =======================================================================
  385. General structs/enums
  386. =======================================================================
  387. */
  388. typedef enum _ENetSocketType {
  389. ENET_SOCKET_TYPE_STREAM = 1,
  390. ENET_SOCKET_TYPE_DATAGRAM = 2
  391. } ENetSocketType;
  392. typedef enum _ENetSocketWait {
  393. ENET_SOCKET_WAIT_NONE = 0,
  394. ENET_SOCKET_WAIT_SEND = (1 << 0),
  395. ENET_SOCKET_WAIT_RECEIVE = (1 << 1),
  396. ENET_SOCKET_WAIT_INTERRUPT = (1 << 2)
  397. } ENetSocketWait;
  398. typedef enum _ENetSocketOption {
  399. ENET_SOCKOPT_NONBLOCK = 1,
  400. ENET_SOCKOPT_BROADCAST = 2,
  401. ENET_SOCKOPT_RCVBUF = 3,
  402. ENET_SOCKOPT_SNDBUF = 4,
  403. ENET_SOCKOPT_REUSEADDR = 5,
  404. ENET_SOCKOPT_RCVTIMEO = 6,
  405. ENET_SOCKOPT_SNDTIMEO = 7,
  406. ENET_SOCKOPT_ERROR = 8,
  407. ENET_SOCKOPT_NODELAY = 9,
  408. ENET_SOCKOPT_IPV6_V6ONLY = 10
  409. } ENetSocketOption;
  410. typedef enum _ENetSocketShutdown {
  411. ENET_SOCKET_SHUTDOWN_READ = 0,
  412. ENET_SOCKET_SHUTDOWN_WRITE = 1,
  413. ENET_SOCKET_SHUTDOWN_READ_WRITE = 2
  414. } ENetSocketShutdown;
  415. typedef struct _ENetAddress {
  416. union {
  417. struct in6_addr ipv6;
  418. struct in4_addr ipv4;
  419. };
  420. uint16_t port;
  421. } ENetAddress;
  422. #define in6_equal(a, b) (memcmp(&a, &b, sizeof(struct in6_addr)) == 0)
  423. typedef enum _ENetPacketFlag {
  424. ENET_PACKET_FLAG_NONE = 0,
  425. ENET_PACKET_FLAG_RELIABLE = (1 << 0),
  426. ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1),
  427. ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2),
  428. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED = (1 << 3),
  429. ENET_PACKET_FLAG_INSTANT = (1 << 4),
  430. ENET_PACKET_FLAG_SENT = (1 << 8)
  431. } ENetPacketFlag;
  432. typedef void (ENET_CALLBACK *ENetPacketFreeCallback)(void*);
  433. typedef struct _ENetPacket {
  434. enet_uint32 flags;
  435. enet_uint32 dataLength;
  436. enet_uint8* data;
  437. ENetPacketFreeCallback freeCallback;
  438. enet_uint32 referenceCount;
  439. } ENetPacket;
  440. typedef struct _ENetAcknowledgement {
  441. ENetListNode acknowledgementList;
  442. enet_uint32 sentTime;
  443. ENetProtocol command;
  444. } ENetAcknowledgement;
  445. typedef struct _ENetOutgoingCommand {
  446. ENetListNode outgoingCommandList;
  447. enet_uint16 reliableSequenceNumber;
  448. enet_uint16 unreliableSequenceNumber;
  449. enet_uint32 sentTime;
  450. enet_uint32 roundTripTimeout;
  451. enet_uint32 roundTripTimeoutLimit;
  452. enet_uint32 fragmentOffset;
  453. enet_uint16 fragmentLength;
  454. enet_uint16 sendAttempts;
  455. ENetProtocol command;
  456. ENetPacket* packet;
  457. } ENetOutgoingCommand;
  458. typedef struct _ENetIncomingCommand {
  459. ENetListNode incomingCommandList;
  460. enet_uint16 reliableSequenceNumber;
  461. enet_uint16 unreliableSequenceNumber;
  462. ENetProtocol command;
  463. enet_uint32 fragmentCount;
  464. enet_uint32 fragmentsRemaining;
  465. enet_uint32* fragments;
  466. ENetPacket* packet;
  467. } ENetIncomingCommand;
  468. typedef enum _ENetPeerState {
  469. ENET_PEER_STATE_DISCONNECTED = 0,
  470. ENET_PEER_STATE_CONNECTING = 1,
  471. ENET_PEER_STATE_ACKNOWLEDGING_CONNECT = 2,
  472. ENET_PEER_STATE_CONNECTION_PENDING = 3,
  473. ENET_PEER_STATE_CONNECTION_SUCCEEDED = 4,
  474. ENET_PEER_STATE_CONNECTED = 5,
  475. ENET_PEER_STATE_DISCONNECT_LATER = 6,
  476. ENET_PEER_STATE_DISCONNECTING = 7,
  477. ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT = 8,
  478. ENET_PEER_STATE_ZOMBIE = 9
  479. } ENetPeerState;
  480. enum {
  481. ENET_HOST_BUFFER_SIZE_MIN = 256 * 1024,
  482. ENET_HOST_BUFFER_SIZE_MAX = 1024 * 1024,
  483. ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000,
  484. ENET_HOST_DEFAULT_MTU = 1280,
  485. ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024,
  486. ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
  487. ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 500,
  488. ENET_PEER_DEFAULT_PACKET_THROTTLE = 32,
  489. ENET_PEER_PACKET_THROTTLE_SCALE = 32,
  490. ENET_PEER_PACKET_THROTTLE_COUNTER = 7,
  491. ENET_PEER_PACKET_THROTTLE_ACCELERATION = 2,
  492. ENET_PEER_PACKET_THROTTLE_DECELERATION = 2,
  493. ENET_PEER_PACKET_THROTTLE_INTERVAL = 5000,
  494. ENET_PEER_PACKET_LOSS_SCALE = (1 << 16),
  495. ENET_PEER_PACKET_LOSS_INTERVAL = 10000,
  496. ENET_PEER_WINDOW_SIZE_SCALE = 64 * 1024,
  497. ENET_PEER_TIMEOUT_LIMIT = 32,
  498. ENET_PEER_TIMEOUT_MINIMUM = 5000,
  499. ENET_PEER_TIMEOUT_MAXIMUM = 30000,
  500. ENET_PEER_PING_INTERVAL = 500,
  501. ENET_PEER_UNSEQUENCED_WINDOWS = 64,
  502. ENET_PEER_UNSEQUENCED_WINDOW_SIZE = 1024,
  503. ENET_PEER_FREE_UNSEQUENCED_WINDOWS = 32,
  504. ENET_PEER_RELIABLE_WINDOWS = 16,
  505. ENET_PEER_RELIABLE_WINDOW_SIZE = 0x1000,
  506. ENET_PEER_FREE_RELIABLE_WINDOWS = 8
  507. };
  508. typedef struct _ENetChannel {
  509. enet_uint16 outgoingReliableSequenceNumber;
  510. enet_uint16 outgoingUnreliableSequenceNumber;
  511. enet_uint16 usedReliableWindows;
  512. enet_uint16 reliableWindows[ENET_PEER_RELIABLE_WINDOWS];
  513. enet_uint16 incomingReliableSequenceNumber;
  514. enet_uint16 incomingUnreliableSequenceNumber;
  515. ENetList incomingReliableCommands;
  516. ENetList incomingUnreliableCommands;
  517. } ENetChannel;
  518. typedef struct _ENetPeer {
  519. ENetListNode dispatchList;
  520. struct _ENetHost* host;
  521. enet_uint16 outgoingPeerID;
  522. enet_uint16 incomingPeerID;
  523. enet_uint32 connectID;
  524. enet_uint8 outgoingSessionID;
  525. enet_uint8 incomingSessionID;
  526. ENetAddress address;
  527. void* data;
  528. ENetPeerState state;
  529. ENetChannel* channels;
  530. size_t channelCount;
  531. enet_uint32 incomingBandwidth;
  532. enet_uint32 outgoingBandwidth;
  533. enet_uint32 incomingBandwidthThrottleEpoch;
  534. enet_uint32 outgoingBandwidthThrottleEpoch;
  535. enet_uint32 incomingDataTotal;
  536. enet_uint64 totalDataReceived;
  537. enet_uint32 outgoingDataTotal;
  538. enet_uint64 totalDataSent;
  539. enet_uint32 lastSendTime;
  540. enet_uint32 lastReceiveTime;
  541. enet_uint32 nextTimeout;
  542. enet_uint32 earliestTimeout;
  543. enet_uint32 packetLossEpoch;
  544. enet_uint32 packetsSent;
  545. enet_uint64 totalPacketsSent;
  546. enet_uint32 packetsLost;
  547. enet_uint64 totalPacketsLost;
  548. enet_uint32 packetLoss;
  549. enet_uint32 packetLossVariance;
  550. enet_uint32 packetThrottle;
  551. enet_uint32 packetThrottleThreshold;
  552. enet_uint32 packetThrottleLimit;
  553. enet_uint32 packetThrottleCounter;
  554. enet_uint32 packetThrottleEpoch;
  555. enet_uint32 packetThrottleAcceleration;
  556. enet_uint32 packetThrottleDeceleration;
  557. enet_uint32 packetThrottleInterval;
  558. enet_uint32 pingInterval;
  559. enet_uint32 timeoutLimit;
  560. enet_uint32 timeoutMinimum;
  561. enet_uint32 timeoutMaximum;
  562. enet_uint32 smoothedRoundTripTime;
  563. enet_uint32 lastRoundTripTime;
  564. enet_uint32 lowestRoundTripTime;
  565. enet_uint32 lastRoundTripTimeVariance;
  566. enet_uint32 highestRoundTripTimeVariance;
  567. enet_uint32 roundTripTime;
  568. enet_uint32 roundTripTimeVariance;
  569. enet_uint32 mtu;
  570. enet_uint32 windowSize;
  571. enet_uint32 reliableDataInTransit;
  572. enet_uint16 outgoingReliableSequenceNumber;
  573. ENetList acknowledgements;
  574. ENetList sentReliableCommands;
  575. ENetList sentUnreliableCommands;
  576. ENetList outgoingReliableCommands;
  577. ENetList outgoingUnreliableCommands;
  578. ENetList dispatchedCommands;
  579. int needsDispatch;
  580. enet_uint16 incomingUnsequencedGroup;
  581. enet_uint16 outgoingUnsequencedGroup;
  582. enet_uint32 unsequencedWindow[ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32];
  583. enet_uint32 eventData;
  584. size_t totalWaitingData;
  585. } ENetPeer;
  586. typedef enet_uint32 (ENET_CALLBACK *ENetChecksumCallback)(const ENetBuffer* buffers, size_t bufferCount);
  587. typedef int (ENET_CALLBACK *ENetInterceptCallback)(struct _ENetHost* host, void* event);
  588. typedef struct _ENetHost {
  589. ENetSocket socket;
  590. ENetAddress address;
  591. enet_uint32 incomingBandwidth;
  592. enet_uint32 outgoingBandwidth;
  593. enet_uint32 bandwidthThrottleEpoch;
  594. enet_uint32 mtu;
  595. enet_uint32 randomSeed;
  596. int recalculateBandwidthLimits;
  597. enet_uint8 preventConnections;
  598. ENetPeer* peers;
  599. size_t peerCount;
  600. size_t channelLimit;
  601. enet_uint32 serviceTime;
  602. ENetList dispatchQueue;
  603. int continueSending;
  604. size_t packetSize;
  605. enet_uint16 headerFlags;
  606. enet_uint32 totalSentData;
  607. enet_uint32 totalSentPackets;
  608. enet_uint32 totalReceivedData;
  609. enet_uint32 totalReceivedPackets;
  610. ENetProtocol commands[ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
  611. size_t commandCount;
  612. ENetBuffer buffers[ENET_BUFFER_MAXIMUM];
  613. size_t bufferCount;
  614. enet_uint8 compression;
  615. char* compressionBuffer;
  616. size_t compressionBufferSize;
  617. ENetChecksumCallback checksumCallback;
  618. enet_uint8 packetData[2][ENET_PROTOCOL_MAXIMUM_MTU];
  619. ENetAddress receivedAddress;
  620. enet_uint8* receivedData;
  621. size_t receivedDataLength;
  622. ENetInterceptCallback interceptCallback;
  623. size_t connectedPeers;
  624. size_t bandwidthLimitedPeers;
  625. size_t duplicatePeers;
  626. size_t maximumPacketSize;
  627. size_t maximumWaitingData;
  628. } ENetHost;
  629. typedef enum _ENetEventType {
  630. ENET_EVENT_TYPE_NONE = 0,
  631. ENET_EVENT_TYPE_CONNECT = 1,
  632. ENET_EVENT_TYPE_DISCONNECT = 2,
  633. ENET_EVENT_TYPE_RECEIVE = 3,
  634. ENET_EVENT_TYPE_DISCONNECT_TIMEOUT = 4
  635. } ENetEventType;
  636. typedef struct _ENetEvent {
  637. ENetEventType type;
  638. ENetPeer* peer;
  639. enet_uint8 channelID;
  640. enet_uint32 data;
  641. ENetPacket* packet;
  642. } ENetEvent;
  643. /*
  644. =======================================================================
  645. Public API
  646. =======================================================================
  647. */
  648. ENET_API int enet_initialize(void);
  649. ENET_API int enet_initialize_with_callbacks(ENetVersion, const ENetCallbacks*);
  650. ENET_API void enet_deinitialize(void);
  651. ENET_API ENetVersion enet_linked_version(void);
  652. ENET_API int enet_array_is_zeroed(const uint8_t*, int);
  653. ENET_API size_t enet_string_copy(char*, const char*, size_t);
  654. ENET_API enet_uint32 enet_time_get(void);
  655. ENET_API enet_uint32 enet_crc32(const ENetBuffer*, size_t);
  656. ENET_API ENetPacket* enet_packet_create(const void*, size_t, enet_uint32);
  657. ENET_API ENetPacket* enet_packet_create_offset(const void*, size_t, size_t, enet_uint32);
  658. ENET_API void enet_packet_destroy(ENetPacket*);
  659. ENET_API int enet_peer_send(ENetPeer*, enet_uint8, ENetPacket*);
  660. ENET_API ENetPacket* enet_peer_receive(ENetPeer*, enet_uint8*);
  661. ENET_API void enet_peer_ping(ENetPeer*);
  662. ENET_API void enet_peer_ping_interval(ENetPeer*, enet_uint32);
  663. ENET_API void enet_peer_timeout(ENetPeer*, enet_uint32, enet_uint32, enet_uint32);
  664. ENET_API void enet_peer_reset(ENetPeer*);
  665. ENET_API void enet_peer_disconnect(ENetPeer*, enet_uint32);
  666. ENET_API void enet_peer_disconnect_now(ENetPeer*, enet_uint32);
  667. ENET_API void enet_peer_disconnect_later(ENetPeer*, enet_uint32);
  668. ENET_API void enet_peer_throttle_configure(ENetPeer*, enet_uint32, enet_uint32, enet_uint32, enet_uint32);
  669. ENET_API ENetHost* enet_host_create(const ENetAddress*, size_t, size_t, enet_uint32, enet_uint32, int);
  670. ENET_API void enet_host_destroy(ENetHost*);
  671. ENET_API void enet_host_enable_compression(ENetHost*);
  672. ENET_API void enet_host_prevent_connections(ENetHost*, enet_uint8);
  673. ENET_API ENetPeer* enet_host_connect(ENetHost*, const ENetAddress*, size_t, enet_uint32);
  674. ENET_API int enet_host_check_events(ENetHost*, ENetEvent*);
  675. ENET_API int enet_host_service(ENetHost*, ENetEvent*, enet_uint32);
  676. ENET_API void enet_host_flush(ENetHost*);
  677. ENET_API void enet_host_broadcast(ENetHost*, enet_uint8, ENetPacket*);
  678. ENET_API void enet_host_broadcast_exclude(ENetHost*, enet_uint8, ENetPacket*, ENetPeer*);
  679. ENET_API void enet_host_broadcast_selective(ENetHost*, enet_uint8, ENetPacket*, ENetPeer**, size_t);
  680. ENET_API void enet_host_channel_limit(ENetHost*, size_t);
  681. ENET_API void enet_host_bandwidth_limit(ENetHost*, enet_uint32, enet_uint32);
  682. ENET_API int enet_address_set_host_ip(ENetAddress*, const char*);
  683. ENET_API int enet_address_set_host(ENetAddress*, const char*);
  684. ENET_API int enet_address_get_host_ip(const ENetAddress*, char*, size_t);
  685. ENET_API int enet_address_get_host(const ENetAddress*, char*, size_t);
  686. ENET_API ENetSocket enet_socket_create(ENetSocketType);
  687. ENET_API int enet_socket_bind(ENetSocket, const ENetAddress*);
  688. ENET_API int enet_socket_get_address(ENetSocket, ENetAddress*);
  689. ENET_API int enet_socket_listen(ENetSocket, int);
  690. ENET_API ENetSocket enet_socket_accept(ENetSocket, ENetAddress*);
  691. ENET_API int enet_socket_connect(ENetSocket, const ENetAddress*);
  692. ENET_API int enet_socket_send(ENetSocket, const ENetAddress*, const ENetBuffer*, size_t);
  693. ENET_API int enet_socket_receive(ENetSocket, ENetAddress*, ENetBuffer*, size_t);
  694. ENET_API int enet_socket_wait(ENetSocket, enet_uint32*, enet_uint64);
  695. ENET_API int enet_socket_set_option(ENetSocket, ENetSocketOption, int);
  696. ENET_API int enet_socket_get_option(ENetSocket, ENetSocketOption, int*);
  697. ENET_API int enet_socket_shutdown(ENetSocket, ENetSocketShutdown);
  698. ENET_API void enet_socket_destroy(ENetSocket);
  699. ENET_API int enet_socket_set_select(ENetSocket, ENetSocketSet*, ENetSocketSet*, enet_uint32);
  700. /* Extended API for easier binding in other programming languages */
  701. ENET_API void* enet_packet_get_data(const ENetPacket*);
  702. ENET_API int enet_packet_get_length(const ENetPacket*);
  703. ENET_API void enet_packet_set_free_callback(ENetPacket*, const void*);
  704. ENET_API int enet_packet_check_references(const ENetPacket*);
  705. ENET_API void enet_packet_dispose(ENetPacket*);
  706. ENET_API enet_uint32 enet_host_get_peers_count(const ENetHost*);
  707. ENET_API enet_uint32 enet_host_get_packets_sent(const ENetHost*);
  708. ENET_API enet_uint32 enet_host_get_packets_received(const ENetHost*);
  709. ENET_API enet_uint32 enet_host_get_bytes_sent(const ENetHost*);
  710. ENET_API enet_uint32 enet_host_get_bytes_received(const ENetHost*);
  711. ENET_API enet_uint32 enet_peer_get_id(const ENetPeer*);
  712. ENET_API int enet_peer_get_ip(const ENetPeer*, char*, size_t);
  713. ENET_API enet_uint16 enet_peer_get_port(const ENetPeer*);
  714. ENET_API enet_uint32 enet_peer_get_mtu(const ENetPeer*);
  715. ENET_API ENetPeerState enet_peer_get_state(const ENetPeer*);
  716. ENET_API enet_uint32 enet_peer_get_rtt(const ENetPeer*);
  717. ENET_API enet_uint32 enet_peer_get_lastsendtime(const ENetPeer*);
  718. ENET_API enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer*);
  719. ENET_API enet_uint64 enet_peer_get_packets_sent(const ENetPeer*);
  720. ENET_API enet_uint64 enet_peer_get_packets_lost(const ENetPeer*);
  721. ENET_API enet_uint64 enet_peer_get_bytes_sent(const ENetPeer*);
  722. ENET_API enet_uint64 enet_peer_get_bytes_received(const ENetPeer*);
  723. ENET_API void* enet_peer_get_data(const ENetPeer*);
  724. ENET_API void enet_peer_set_data(ENetPeer*, const void*);
  725. /*
  726. =======================================================================
  727. Private API
  728. =======================================================================
  729. */
  730. extern void enet_host_bandwidth_throttle(ENetHost*);
  731. extern enet_uint64 enet_host_random_seed(void);
  732. extern int enet_peer_throttle(ENetPeer*, enet_uint32);
  733. extern void enet_peer_reset_queues(ENetPeer*);
  734. extern void enet_peer_setup_outgoing_command(ENetPeer*, ENetOutgoingCommand*);
  735. extern ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer*, const ENetProtocol*, ENetPacket*, enet_uint32, enet_uint16);
  736. extern ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer*, const ENetProtocol*, const void*, size_t, enet_uint32, enet_uint32);
  737. extern ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer*, const ENetProtocol*, enet_uint16);
  738. extern void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer*, ENetChannel*);
  739. extern void enet_peer_dispatch_incoming_reliable_commands(ENetPeer*, ENetChannel*);
  740. extern void enet_peer_on_connect(ENetPeer*);
  741. extern void enet_peer_on_disconnect(ENetPeer*);
  742. extern size_t enet_protocol_command_size(enet_uint8);
  743. #ifdef __cplusplus
  744. }
  745. #endif
  746. #if defined(ENET_IMPLEMENTATION) && !defined(ENET_IMPLEMENTATION_DONE)
  747. #define ENET_IMPLEMENTATION_DONE 1
  748. #ifdef __cplusplus
  749. extern "C" {
  750. #endif
  751. #ifdef ENET_LZ4
  752. #include "lz4/lz4.h"
  753. #endif
  754. #ifdef __MINGW32__
  755. #include "mingw/inet_ntop.c"
  756. #include "mingw/inet_pton.c"
  757. #endif
  758. /*
  759. =======================================================================
  760. Atomics
  761. =======================================================================
  762. */
  763. #ifdef _MSC_VER
  764. #define ENET_AT_CASSERT_PRED(predicate) sizeof(char[2 * !!(predicate) - 1])
  765. #define ENET_IS_SUPPORTED_ATOMIC(size) ENET_AT_CASSERT_PRED(size == 1 || size == 2 || size == 4 || size == 8)
  766. #define ENET_ATOMIC_SIZEOF(variable) (ENET_IS_SUPPORTED_ATOMIC(sizeof(*(variable))), sizeof(*(variable)))
  767. __inline int64_t enet_at_atomic_read(char* ptr, size_t size) {
  768. switch (size) {
  769. case 1:
  770. return _InterlockedExchangeAdd8((volatile char*)ptr, 0);
  771. case 2:
  772. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, 0);
  773. case 4:
  774. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  775. return InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  776. #else
  777. return _InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  778. #endif
  779. case 8:
  780. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  781. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  782. #else
  783. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  784. #endif
  785. default:
  786. return 0x0;
  787. }
  788. }
  789. __inline int64_t enet_at_atomic_write(char* ptr, int64_t value, size_t size) {
  790. switch (size) {
  791. case 1:
  792. return _InterlockedExchange8((volatile char*)ptr, (char)value);
  793. case 2:
  794. return _InterlockedExchange16((volatile SHORT*)ptr, (SHORT)value);
  795. case 4:
  796. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  797. return InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  798. #else
  799. return _InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  800. #endif
  801. case 8:
  802. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  803. return InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  804. #else
  805. return _InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  806. #endif
  807. default:
  808. return 0x0;
  809. }
  810. }
  811. __inline int64_t enet_at_atomic_cas(char* ptr, int64_t new_val, int64_t old_val, size_t size) {
  812. switch (size) {
  813. case 1:
  814. return _InterlockedCompareExchange8((volatile char*)ptr, (char)new_val, (char)old_val);
  815. case 2:
  816. return _InterlockedCompareExchange16((volatile SHORT*)ptr, (SHORT)new_val, (SHORT)old_val);
  817. case 4:
  818. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  819. return InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  820. #else
  821. return _InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  822. #endif
  823. case 8:
  824. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  825. return InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  826. #else
  827. return _InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  828. #endif
  829. default:
  830. return 0x0;
  831. }
  832. }
  833. __inline int64_t enet_at_atomic_inc(char* ptr, int64_t delta, size_t data_size) {
  834. switch (data_size) {
  835. case 1:
  836. return _InterlockedExchangeAdd8((volatile char*)ptr, (char)delta);
  837. case 2:
  838. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, (SHORT)delta);
  839. case 4:
  840. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  841. return InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  842. #else
  843. return _InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  844. #endif
  845. case 8:
  846. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  847. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  848. #else
  849. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  850. #endif
  851. default:
  852. return 0x0;
  853. }
  854. }
  855. #define ENET_ATOMIC_READ(variable) enet_at_atomic_read((char*)(variable), ENET_ATOMIC_SIZEOF(variable))
  856. #define ENET_ATOMIC_WRITE(variable, new_val) enet_at_atomic_write((char*)(variable), (int64_t)(new_val), ENET_ATOMIC_SIZEOF(variable))
  857. #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))
  858. #define ENET_ATOMIC_INC(variable) enet_at_atomic_inc((char*)(variable), 1, ENET_ATOMIC_SIZEOF(variable))
  859. #define ENET_ATOMIC_DEC(variable) enet_at_atomic_inc((char*)(variable), -1, ENET_ATOMIC_SIZEOF(variable))
  860. #define ENET_ATOMIC_INC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), (delta), ENET_ATOMIC_SIZEOF(variable))
  861. #define ENET_ATOMIC_DEC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), -(delta), ENET_ATOMIC_SIZEOF(variable))
  862. #elif defined(__GNUC__) || defined(__clang__)
  863. #if defined(__clang__) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
  864. #define AT_HAVE_ATOMICS
  865. #endif
  866. /* We want to use __atomic built-ins if possible because the __sync primitives are
  867. deprecated, because the __atomic build-ins allow us to use ENET_ATOMIC_WRITE on
  868. uninitialized memory without running into undefined behavior, and because the
  869. __atomic versions generate more efficient code since we don't need to rely on
  870. CAS when we don't actually want it.
  871. Note that we use acquire-release memory order (like mutexes do). We could use
  872. sequentially consistent memory order but that has lower performance and is
  873. almost always unneeded. */
  874. #ifdef AT_HAVE_ATOMICS
  875. #define ENET_ATOMIC_READ(ptr) __atomic_load_n((ptr), __ATOMIC_ACQUIRE)
  876. #define ENET_ATOMIC_WRITE(ptr, value) __atomic_store_n((ptr), (value), __ATOMIC_RELEASE)
  877. #ifndef typeof
  878. #define typeof __typeof__
  879. #endif
  880. /* clang_analyzer doesn't know that CAS writes to memory so it complains about
  881. potentially lost data. Replace the code with the equivalent non-sync code. */
  882. #ifdef __clang_analyzer__
  883. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  884. ({ \
  885. typeof(*(ptr)) ENET_ATOMIC_CAS_old_actual_ = (*(ptr)); \
  886. if (ATOMIC_CAS_old_actual_ == (old_value)) \
  887. *(ptr) = new_value; \
  888. ENET_ATOMIC_CAS_old_actual_; \
  889. })
  890. #else
  891. /* Could use __auto_type instead of typeof but that shouldn't work in C++.
  892. The ({ }) syntax is a GCC extension called statement expression. It lets
  893. us return a value out of the macro.
  894. TODO We should return bool here instead of the old value to avoid the ABA
  895. problem. */
  896. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  897. ({ \
  898. typeof(*(ptr)) ENET_ATOMIC_CAS_expected_ = (old_value); \
  899. __atomic_compare_exchange_n((ptr), &ENET_ATOMIC_CAS_expected_, (new_value), false, \
  900. __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE); \
  901. ENET_ATOMIC_CAS_expected_; \
  902. })
  903. #endif
  904. #define ENET_ATOMIC_INC(ptr) __atomic_fetch_add((ptr), 1, __ATOMIC_ACQ_REL)
  905. #define ENET_ATOMIC_DEC(ptr) __atomic_fetch_sub((ptr), 1, __ATOMIC_ACQ_REL)
  906. #define ENET_ATOMIC_INC_BY(ptr, delta) __atomic_fetch_add((ptr), (delta), __ATOMIC_ACQ_REL)
  907. #define ENET_ATOMIC_DEC_BY(ptr, delta) __atomic_fetch_sub((ptr), (delta), __ATOMIC_ACQ_REL)
  908. #else
  909. #define ENET_ATOMIC_READ(variable) __sync_fetch_and_add(variable, 0)
  910. #define ENET_ATOMIC_WRITE(variable, new_val) (void)__sync_val_compare_and_swap((variable), *(variable), (new_val))
  911. #define ENET_ATOMIC_CAS(variable, old_value, new_val) __sync_val_compare_and_swap((variable), (old_value), (new_val))
  912. #define ENET_ATOMIC_INC(variable) __sync_fetch_and_add((variable), 1)
  913. #define ENET_ATOMIC_DEC(variable) __sync_fetch_and_sub((variable), 1)
  914. #define ENET_ATOMIC_INC_BY(variable, delta) __sync_fetch_and_add((variable), (delta), 1)
  915. #define ENET_ATOMIC_DEC_BY(variable, delta) __sync_fetch_and_sub((variable), (delta), 1)
  916. #endif
  917. #undef AT_HAVE_ATOMICS
  918. #endif
  919. /*
  920. =======================================================================
  921. Callbacks
  922. =======================================================================
  923. */
  924. static ENetCallbacks callbacks = {
  925. malloc,
  926. free,
  927. abort
  928. };
  929. int enet_initialize_with_callbacks(ENetVersion version, const ENetCallbacks* inits) {
  930. if (version < ENET_VERSION_CREATE(1, 3, 0))
  931. return -1;
  932. if (inits->malloc != NULL || inits->free != NULL) {
  933. if (inits->malloc == NULL || inits->free == NULL)
  934. return -1;
  935. callbacks.malloc = inits->malloc;
  936. callbacks.free = inits->free;
  937. }
  938. if (inits->noMemory != NULL)
  939. callbacks.noMemory = inits->noMemory;
  940. return enet_initialize();
  941. }
  942. void* enet_malloc(size_t size) {
  943. void* memory = callbacks.malloc(size);
  944. if (memory == NULL)
  945. callbacks.noMemory();
  946. return memory;
  947. }
  948. void enet_free(void* memory) {
  949. callbacks.free(memory);
  950. }
  951. /*
  952. =======================================================================
  953. List
  954. =======================================================================
  955. */
  956. void enet_list_clear(ENetList* list) {
  957. list->sentinel.next = &list->sentinel;
  958. list->sentinel.previous = &list->sentinel;
  959. }
  960. ENetListIterator enet_list_insert(ENetListIterator position, void* data) {
  961. ENetListIterator result = (ENetListIterator)data;
  962. result->previous = position->previous;
  963. result->next = position;
  964. result->previous->next = result;
  965. position->previous = result;
  966. return result;
  967. }
  968. void* enet_list_remove(ENetListIterator position) {
  969. position->previous->next = position->next;
  970. position->next->previous = position->previous;
  971. return position;
  972. }
  973. ENetListIterator enet_list_move(ENetListIterator position, void* dataFirst, void* dataLast) {
  974. ENetListIterator first = (ENetListIterator)dataFirst;
  975. ENetListIterator last = (ENetListIterator)dataLast;
  976. first->previous->next = last->next;
  977. last->next->previous = first->previous;
  978. first->previous = position->previous;
  979. last->next = position;
  980. first->previous->next = first;
  981. position->previous = last;
  982. return first;
  983. }
  984. size_t enet_list_size(ENetList* list) {
  985. size_t size = 0;
  986. ENetListIterator position;
  987. for (position = enet_list_begin(list); position != enet_list_end(list); position = enet_list_next(position)) {
  988. ++size;
  989. }
  990. return size;
  991. }
  992. /*
  993. =======================================================================
  994. Utilities
  995. =======================================================================
  996. */
  997. ENetVersion enet_linked_version(void) {
  998. return ENET_VERSION;
  999. }
  1000. int enet_array_is_zeroed(const uint8_t* array, int length) {
  1001. size_t i;
  1002. for (i = 0; i < length; i++) {
  1003. if (array[i] != 0)
  1004. return -1;
  1005. }
  1006. return 0;
  1007. }
  1008. size_t enet_string_copy(char* destination, const char* source, size_t length) {
  1009. char *d = destination;
  1010. const char *s = source;
  1011. size_t n = length;
  1012. if (n != 0 && --n != 0) {
  1013. do {
  1014. if ((*d++ = *s++) == 0)
  1015. break;
  1016. }
  1017. while (--n != 0);
  1018. }
  1019. if (n == 0) {
  1020. if (length != 0)
  1021. *d = '\0';
  1022. while (*s++);
  1023. }
  1024. return (s - source - 1);
  1025. }
  1026. /*
  1027. =======================================================================
  1028. Time
  1029. =======================================================================
  1030. */
  1031. #ifdef _WIN32
  1032. static LARGE_INTEGER gettime_offset(void) {
  1033. SYSTEMTIME s;
  1034. FILETIME f;
  1035. LARGE_INTEGER t;
  1036. s.wYear = 1970;
  1037. s.wMonth = 1;
  1038. s.wDay = 1;
  1039. s.wHour = 0;
  1040. s.wMinute = 0;
  1041. s.wSecond = 0;
  1042. s.wMilliseconds = 0;
  1043. SystemTimeToFileTime(&s, &f);
  1044. t.QuadPart = f.dwHighDateTime;
  1045. t.QuadPart <<= 32;
  1046. t.QuadPart |= f.dwLowDateTime;
  1047. return t;
  1048. }
  1049. int clock_gettime(int X, struct timespec* tv) {
  1050. LARGE_INTEGER t;
  1051. FILETIME f;
  1052. double microseconds;
  1053. static LARGE_INTEGER offset;
  1054. static double frequencyToMicroseconds;
  1055. static int initialized = 0;
  1056. static BOOL usePerformanceCounter = 0;
  1057. if (!initialized) {
  1058. LARGE_INTEGER performanceFrequency;
  1059. initialized = 1;
  1060. usePerformanceCounter = QueryPerformanceFrequency(&performanceFrequency);
  1061. if (usePerformanceCounter) {
  1062. QueryPerformanceCounter(&offset);
  1063. frequencyToMicroseconds = (double)performanceFrequency.QuadPart / 1000000.;
  1064. } else {
  1065. offset = gettime_offset();
  1066. frequencyToMicroseconds = 10.;
  1067. }
  1068. }
  1069. if (usePerformanceCounter) {
  1070. QueryPerformanceCounter(&t);
  1071. } else {
  1072. GetSystemTimeAsFileTime(&f);
  1073. t.QuadPart = f.dwHighDateTime;
  1074. t.QuadPart <<= 32;
  1075. t.QuadPart |= f.dwLowDateTime;
  1076. }
  1077. t.QuadPart -= offset.QuadPart;
  1078. microseconds = (double)t.QuadPart / frequencyToMicroseconds;
  1079. t.QuadPart = (LONGLONG)microseconds;
  1080. tv->tv_sec = (long)(t.QuadPart / 1000000);
  1081. tv->tv_nsec = t.QuadPart % 1000000 * 1000;
  1082. return 0;
  1083. }
  1084. #elif __APPLE__ && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 && !defined(CLOCK_MONOTONIC)
  1085. #define CLOCK_MONOTONIC 0
  1086. int clock_gettime(int X, struct timespec* ts) {
  1087. clock_serv_t cclock;
  1088. mach_timespec_t mts;
  1089. host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
  1090. clock_get_time(cclock, &mts);
  1091. mach_port_deallocate(mach_task_self(), cclock);
  1092. ts->tv_sec = mts.tv_sec;
  1093. ts->tv_nsec = mts.tv_nsec;
  1094. return 0;
  1095. }
  1096. #endif
  1097. enet_uint32 enet_time_get(void) {
  1098. static enet_uint64 start_time_ns = 0;
  1099. struct timespec ts;
  1100. #ifdef CLOCK_MONOTONIC_RAW
  1101. clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
  1102. #else
  1103. clock_gettime(CLOCK_MONOTONIC, &ts);
  1104. #endif
  1105. static const enet_uint64 ns_in_s = 1000 * 1000 * 1000;
  1106. static const enet_uint64 ns_in_ms = 1000 * 1000;
  1107. enet_uint64 current_time_ns = ts.tv_nsec + (enet_uint64)ts.tv_sec * ns_in_s;
  1108. enet_uint64 offset_ns = ENET_ATOMIC_READ(&start_time_ns);
  1109. if (offset_ns == 0) {
  1110. enet_uint64 want_value = current_time_ns - 1 * ns_in_ms;
  1111. enet_uint64 old_value = ENET_ATOMIC_CAS(&start_time_ns, 0, want_value);
  1112. offset_ns = old_value == 0 ? want_value : old_value;
  1113. }
  1114. enet_uint64 result_in_ns = current_time_ns - offset_ns;
  1115. return (enet_uint32)(result_in_ns / ns_in_ms);
  1116. }
  1117. /*
  1118. =======================================================================
  1119. Checksum
  1120. =======================================================================
  1121. */
  1122. static int initializedCRC32 = 0;
  1123. static enet_uint32 crcTable[256];
  1124. static enet_uint32 reflect_crc(int val, int bits) {
  1125. int result = 0, bit;
  1126. for (bit = 0; bit < bits; bit++) {
  1127. if (val & 1)
  1128. result |= 1 << (bits - 1 - bit);
  1129. val >>= 1;
  1130. }
  1131. return result;
  1132. }
  1133. static void initialize_crc32(void) {
  1134. int byte;
  1135. for (byte = 0; byte < 256; ++byte) {
  1136. enet_uint32 crc = reflect_crc(byte, 8) << 24;
  1137. int offset;
  1138. for (offset = 0; offset < 8; ++offset) {
  1139. if (crc & 0x80000000)
  1140. crc = (crc << 1) ^ 0x04c11db7;
  1141. else
  1142. crc <<= 1;
  1143. }
  1144. crcTable[byte] = reflect_crc(crc, 32);
  1145. }
  1146. initializedCRC32 = 1;
  1147. }
  1148. enet_uint32 enet_crc32(const ENetBuffer* buffers, size_t bufferCount) {
  1149. enet_uint32 crc = 0xFFFFFFFF;
  1150. if (!initializedCRC32)
  1151. initialize_crc32();
  1152. while (bufferCount-- > 0) {
  1153. const enet_uint8* data = (const enet_uint8*)buffers->data;
  1154. const enet_uint8* dataEnd = &data[buffers->dataLength];
  1155. while (data < dataEnd) {
  1156. crc = (crc >> 8) ^ crcTable[(crc & 0xFF)^* data++];
  1157. }
  1158. ++buffers;
  1159. }
  1160. return ENET_HOST_TO_NET_32(~crc);
  1161. }
  1162. /*
  1163. =======================================================================
  1164. Packet
  1165. =======================================================================
  1166. */
  1167. ENetPacket* enet_packet_create(const void* data, size_t dataLength, enet_uint32 flags) {
  1168. ENetPacket* packet;
  1169. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1170. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1171. if (packet == NULL)
  1172. return NULL;
  1173. packet->data = (enet_uint8*)data;
  1174. } else {
  1175. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength);
  1176. if (packet == NULL)
  1177. return NULL;
  1178. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1179. if (data != NULL)
  1180. memcpy(packet->data, data, dataLength);
  1181. }
  1182. packet->referenceCount = 0;
  1183. packet->flags = flags;
  1184. packet->dataLength = dataLength;
  1185. packet->freeCallback = NULL;
  1186. return packet;
  1187. }
  1188. ENetPacket* enet_packet_create_offset(const void* data, size_t dataLength, size_t dataOffset, enet_uint32 flags) {
  1189. ENetPacket* packet;
  1190. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1191. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1192. if (packet == NULL)
  1193. return NULL;
  1194. packet->data = (enet_uint8*)data;
  1195. } else {
  1196. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength - dataOffset);
  1197. if (packet == NULL)
  1198. return NULL;
  1199. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1200. if (data != NULL)
  1201. memcpy(packet->data, (char*)data + dataOffset, dataLength - dataOffset);
  1202. }
  1203. packet->referenceCount = 0;
  1204. packet->flags = flags;
  1205. packet->dataLength = dataLength - dataOffset;
  1206. packet->freeCallback = NULL;
  1207. return packet;
  1208. }
  1209. void enet_packet_destroy(ENetPacket* packet) {
  1210. if (packet == NULL)
  1211. return;
  1212. if (packet->freeCallback != NULL)
  1213. (*packet->freeCallback)((void*)packet);
  1214. enet_free(packet);
  1215. }
  1216. /*
  1217. =======================================================================
  1218. Protocol
  1219. =======================================================================
  1220. */
  1221. static size_t commandSizes[ENET_PROTOCOL_COMMAND_COUNT] = {
  1222. 0,
  1223. sizeof(ENetProtocolAcknowledge),
  1224. sizeof(ENetProtocolConnect),
  1225. sizeof(ENetProtocolVerifyConnect),
  1226. sizeof(ENetProtocolDisconnect),
  1227. sizeof(ENetProtocolPing),
  1228. sizeof(ENetProtocolSendReliable),
  1229. sizeof(ENetProtocolSendUnreliable),
  1230. sizeof(ENetProtocolSendFragment),
  1231. sizeof(ENetProtocolSendUnsequenced),
  1232. sizeof(ENetProtocolBandwidthLimit),
  1233. sizeof(ENetProtocolThrottleConfigure),
  1234. sizeof(ENetProtocolSendFragment)
  1235. };
  1236. size_t enet_protocol_command_size(enet_uint8 commandNumber) {
  1237. return commandSizes[commandNumber & ENET_PROTOCOL_COMMAND_MASK];
  1238. }
  1239. static void enet_protocol_change_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1240. if (state == ENET_PEER_STATE_CONNECTED || state == ENET_PEER_STATE_DISCONNECT_LATER)
  1241. enet_peer_on_connect(peer);
  1242. else
  1243. enet_peer_on_disconnect(peer);
  1244. peer->state = state;
  1245. }
  1246. static void enet_protocol_dispatch_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1247. enet_protocol_change_state(host, peer, state);
  1248. if (!peer->needsDispatch) {
  1249. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1250. peer->needsDispatch = 1;
  1251. }
  1252. }
  1253. static int enet_protocol_dispatch_incoming_commands(ENetHost* host, ENetEvent* event) {
  1254. while (!enet_list_empty(&host->dispatchQueue)) {
  1255. ENetPeer* peer = (ENetPeer*)enet_list_remove(enet_list_begin(&host->dispatchQueue));
  1256. peer->needsDispatch = 0;
  1257. switch (peer->state) {
  1258. case ENET_PEER_STATE_CONNECTION_PENDING:
  1259. case ENET_PEER_STATE_CONNECTION_SUCCEEDED:
  1260. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1261. event->type = ENET_EVENT_TYPE_CONNECT;
  1262. event->peer = peer;
  1263. event->data = peer->eventData;
  1264. return 1;
  1265. case ENET_PEER_STATE_ZOMBIE:
  1266. host->recalculateBandwidthLimits = 1;
  1267. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1268. event->peer = peer;
  1269. event->data = peer->eventData;
  1270. enet_peer_reset(peer);
  1271. return 1;
  1272. case ENET_PEER_STATE_CONNECTED:
  1273. if (enet_list_empty(&peer->dispatchedCommands))
  1274. continue;
  1275. event->packet = enet_peer_receive(peer, &event->channelID);
  1276. if (event->packet == NULL)
  1277. continue;
  1278. event->type = ENET_EVENT_TYPE_RECEIVE;
  1279. event->peer = peer;
  1280. if (!enet_list_empty(&peer->dispatchedCommands)) {
  1281. peer->needsDispatch = 1;
  1282. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1283. }
  1284. return 1;
  1285. default:
  1286. break;
  1287. }
  1288. }
  1289. return 0;
  1290. }
  1291. static void enet_protocol_notify_connect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1292. host->recalculateBandwidthLimits = 1;
  1293. if (event != NULL) {
  1294. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1295. peer->totalDataSent = 0;
  1296. peer->totalDataReceived = 0;
  1297. peer->totalPacketsSent = 0;
  1298. peer->totalPacketsLost = 0;
  1299. event->type = ENET_EVENT_TYPE_CONNECT;
  1300. event->peer = peer;
  1301. event->data = peer->eventData;
  1302. } else {
  1303. enet_protocol_dispatch_state(host, peer, peer->state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING);
  1304. }
  1305. }
  1306. static void enet_protocol_notify_disconnect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1307. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1308. host->recalculateBandwidthLimits = 1;
  1309. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1310. enet_peer_reset(peer);
  1311. } else if (event != NULL) {
  1312. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1313. event->peer = peer;
  1314. event->data = 0;
  1315. enet_peer_reset(peer);
  1316. } else {
  1317. peer->eventData = 0;
  1318. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1319. }
  1320. }
  1321. static void enet_protocol_notify_disconnect_timeout(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1322. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1323. host->recalculateBandwidthLimits = 1;
  1324. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1325. enet_peer_reset(peer);
  1326. } else if (event != NULL) {
  1327. event->type = ENET_EVENT_TYPE_DISCONNECT_TIMEOUT;
  1328. event->peer = peer;
  1329. event->data = 0;
  1330. enet_peer_reset(peer);
  1331. } else {
  1332. peer->eventData = 0;
  1333. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1334. }
  1335. }
  1336. static void enet_protocol_remove_sent_unreliable_commands(ENetPeer* peer) {
  1337. ENetOutgoingCommand* outgoingCommand;
  1338. if (enet_list_empty(&peer->sentUnreliableCommands))
  1339. return;
  1340. do {
  1341. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentUnreliableCommands);
  1342. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1343. if (outgoingCommand->packet != NULL) {
  1344. --outgoingCommand->packet->referenceCount;
  1345. if (outgoingCommand->packet->referenceCount == 0) {
  1346. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1347. enet_packet_destroy(outgoingCommand->packet);
  1348. }
  1349. }
  1350. enet_free(outgoingCommand);
  1351. }
  1352. while (!enet_list_empty(&peer->sentUnreliableCommands));
  1353. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1354. enet_peer_disconnect(peer, peer->eventData);
  1355. }
  1356. static ENetProtocolCommand enet_protocol_remove_sent_reliable_command(ENetPeer* peer, enet_uint16 reliableSequenceNumber, enet_uint8 channelID) {
  1357. ENetOutgoingCommand* outgoingCommand = NULL;
  1358. ENetListIterator currentCommand;
  1359. ENetProtocolCommand commandNumber;
  1360. int wasSent = 1;
  1361. for (currentCommand = enet_list_begin(&peer->sentReliableCommands); currentCommand != enet_list_end(&peer->sentReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1362. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1363. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1364. break;
  1365. }
  1366. if (currentCommand == enet_list_end(&peer->sentReliableCommands)) {
  1367. for (currentCommand = enet_list_begin(&peer->outgoingReliableCommands); currentCommand != enet_list_end(&peer->outgoingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1368. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1369. if (outgoingCommand->sendAttempts < 1)
  1370. return ENET_PROTOCOL_COMMAND_NONE;
  1371. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1372. break;
  1373. }
  1374. if (currentCommand == enet_list_end(&peer->outgoingReliableCommands))
  1375. return ENET_PROTOCOL_COMMAND_NONE;
  1376. wasSent = 0;
  1377. }
  1378. if (outgoingCommand == NULL)
  1379. return ENET_PROTOCOL_COMMAND_NONE;
  1380. if (channelID < peer->channelCount) {
  1381. ENetChannel* channel = &peer->channels[channelID];
  1382. enet_uint16 reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1383. if (channel->reliableWindows[reliableWindow] > 0) {
  1384. --channel->reliableWindows[reliableWindow];
  1385. if (!channel->reliableWindows[reliableWindow])
  1386. channel->usedReliableWindows &= ~(1 << reliableWindow);
  1387. }
  1388. }
  1389. commandNumber = (ENetProtocolCommand)(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK);
  1390. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1391. if (outgoingCommand->packet != NULL) {
  1392. if (wasSent)
  1393. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  1394. --outgoingCommand->packet->referenceCount;
  1395. if (outgoingCommand->packet->referenceCount == 0) {
  1396. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1397. enet_packet_destroy(outgoingCommand->packet);
  1398. }
  1399. }
  1400. enet_free(outgoingCommand);
  1401. if (enet_list_empty(&peer->sentReliableCommands))
  1402. return commandNumber;
  1403. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentReliableCommands);
  1404. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  1405. return commandNumber;
  1406. }
  1407. static ENetPeer* enet_protocol_handle_connect(ENetHost* host, ENetProtocolHeader* header, ENetProtocol* command) {
  1408. enet_uint8 incomingSessionID, outgoingSessionID;
  1409. enet_uint32 mtu, windowSize;
  1410. ENetChannel* channel;
  1411. size_t channelCount, duplicatePeers = 0;
  1412. ENetPeer* currentPeer, *peer = NULL;
  1413. ENetProtocol verifyCommand;
  1414. channelCount = ENET_NET_TO_HOST_32(command->connect.channelCount);
  1415. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  1416. return NULL;
  1417. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  1418. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED) {
  1419. if (peer == NULL)
  1420. peer = currentPeer;
  1421. } else if (currentPeer->state != ENET_PEER_STATE_CONNECTING && in6_equal(currentPeer->address.ipv6, host->receivedAddress.ipv6)) {
  1422. if (currentPeer->address.port == host->receivedAddress.port && currentPeer->connectID == command->connect.connectID)
  1423. return NULL;
  1424. ++duplicatePeers;
  1425. }
  1426. }
  1427. if (peer == NULL || duplicatePeers >= host->duplicatePeers)
  1428. return NULL;
  1429. if (channelCount > host->channelLimit)
  1430. channelCount = host->channelLimit;
  1431. peer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  1432. if (peer->channels == NULL)
  1433. return NULL;
  1434. peer->channelCount = channelCount;
  1435. peer->state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
  1436. peer->connectID = command->connect.connectID;
  1437. peer->address = host->receivedAddress;
  1438. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->connect.outgoingPeerID);
  1439. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->connect.incomingBandwidth);
  1440. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->connect.outgoingBandwidth);
  1441. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->connect.packetThrottleInterval);
  1442. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleAcceleration);
  1443. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleDeceleration);
  1444. peer->eventData = ENET_NET_TO_HOST_32(command->connect.data);
  1445. incomingSessionID = command->connect.incomingSessionID == 0xFF ? peer->outgoingSessionID : command->connect.incomingSessionID;
  1446. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1447. if (incomingSessionID == peer->outgoingSessionID)
  1448. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1449. peer->outgoingSessionID = incomingSessionID;
  1450. outgoingSessionID = command->connect.outgoingSessionID == 0xFF ? peer->incomingSessionID : command->connect.outgoingSessionID;
  1451. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1452. if (outgoingSessionID == peer->incomingSessionID)
  1453. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1454. peer->incomingSessionID = outgoingSessionID;
  1455. for (channel = peer->channels; channel < &peer->channels[channelCount]; ++channel) {
  1456. channel->outgoingReliableSequenceNumber = 0;
  1457. channel->outgoingUnreliableSequenceNumber = 0;
  1458. channel->incomingReliableSequenceNumber = 0;
  1459. channel->incomingUnreliableSequenceNumber = 0;
  1460. enet_list_clear(&channel->incomingReliableCommands);
  1461. enet_list_clear(&channel->incomingUnreliableCommands);
  1462. channel->usedReliableWindows = 0;
  1463. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  1464. }
  1465. mtu = ENET_NET_TO_HOST_32(command->connect.mtu);
  1466. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1467. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1468. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1469. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1470. peer->mtu = mtu;
  1471. if (host->outgoingBandwidth == 0 && peer->incomingBandwidth == 0)
  1472. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1473. else if (host->outgoingBandwidth == 0 || peer->incomingBandwidth == 0)
  1474. peer->windowSize = (ENET_MAX(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1475. else
  1476. peer->windowSize = (ENET_MIN(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1477. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1478. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1479. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1480. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1481. if (host->incomingBandwidth == 0)
  1482. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1483. else
  1484. windowSize = (host->incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1485. if (windowSize > ENET_NET_TO_HOST_32(command->connect.windowSize))
  1486. windowSize = ENET_NET_TO_HOST_32(command->connect.windowSize);
  1487. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1488. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1489. else if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1490. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1491. verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  1492. verifyCommand.header.channelID = 0xFF;
  1493. verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16(peer->incomingPeerID);
  1494. verifyCommand.verifyConnect.incomingSessionID = incomingSessionID;
  1495. verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID;
  1496. verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_32(peer->mtu);
  1497. verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32(windowSize);
  1498. verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  1499. verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  1500. verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  1501. verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32(peer->packetThrottleInterval);
  1502. verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(peer->packetThrottleAcceleration);
  1503. verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(peer->packetThrottleDeceleration);
  1504. verifyCommand.verifyConnect.connectID = peer->connectID;
  1505. enet_peer_queue_outgoing_command(peer, &verifyCommand, NULL, 0, 0);
  1506. return peer;
  1507. }
  1508. static int enet_protocol_handle_send_reliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1509. size_t dataLength;
  1510. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1511. return -1;
  1512. dataLength = ENET_NET_TO_HOST_16(command->sendReliable.dataLength);
  1513. *currentData += dataLength;
  1514. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1515. return -1;
  1516. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendReliable), dataLength, ENET_PACKET_FLAG_RELIABLE, 0) == NULL)
  1517. return -1;
  1518. return 0;
  1519. }
  1520. static int enet_protocol_handle_send_unsequenced(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1521. enet_uint32 unsequencedGroup, index;
  1522. size_t dataLength;
  1523. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1524. return -1;
  1525. dataLength = ENET_NET_TO_HOST_16(command->sendUnsequenced.dataLength);
  1526. *currentData += dataLength;
  1527. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1528. return -1;
  1529. unsequencedGroup = ENET_NET_TO_HOST_16(command->sendUnsequenced.unsequencedGroup);
  1530. index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
  1531. if (unsequencedGroup < peer->incomingUnsequencedGroup)
  1532. unsequencedGroup += 0x10000;
  1533. if (unsequencedGroup >= (enet_uint32)peer->incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE)
  1534. return 0;
  1535. unsequencedGroup &= 0xFFFF;
  1536. if (unsequencedGroup - index != peer->incomingUnsequencedGroup) {
  1537. peer->incomingUnsequencedGroup = unsequencedGroup - index;
  1538. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  1539. } else if (peer->unsequencedWindow[index / 32] & (1 << (index % 32))) {
  1540. return 0;
  1541. }
  1542. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnsequenced), dataLength, ENET_PACKET_FLAG_UNSEQUENCED, 0) == NULL)
  1543. return -1;
  1544. peer->unsequencedWindow[index / 32] |= 1 << (index % 32);
  1545. return 0;
  1546. }
  1547. static int enet_protocol_handle_send_unreliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1548. size_t dataLength;
  1549. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1550. return -1;
  1551. dataLength = ENET_NET_TO_HOST_16(command->sendUnreliable.dataLength);
  1552. *currentData += dataLength;
  1553. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1554. return -1;
  1555. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnreliable), dataLength, 0, 0) == NULL)
  1556. return -1;
  1557. return 0;
  1558. }
  1559. static int enet_protocol_handle_send_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1560. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, startSequenceNumber, totalLength;
  1561. ENetChannel* channel;
  1562. enet_uint16 startWindow, currentWindow;
  1563. ENetListIterator currentCommand;
  1564. ENetIncomingCommand* startCommand = NULL;
  1565. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1566. return -1;
  1567. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1568. *currentData += fragmentLength;
  1569. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1570. return -1;
  1571. channel = &peer->channels[command->header.channelID];
  1572. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1573. startWindow = startSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1574. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1575. if (startSequenceNumber < channel->incomingReliableSequenceNumber)
  1576. startWindow += ENET_PEER_RELIABLE_WINDOWS;
  1577. if (startWindow < currentWindow || startWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1578. return 0;
  1579. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1580. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1581. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1582. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1583. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1584. return -1;
  1585. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1586. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1587. if (startSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1588. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1589. continue;
  1590. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1591. break;
  1592. }
  1593. if (incomingCommand->reliableSequenceNumber <= startSequenceNumber) {
  1594. if (incomingCommand->reliableSequenceNumber < startSequenceNumber)
  1595. break;
  1596. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1597. return -1;
  1598. startCommand = incomingCommand;
  1599. break;
  1600. }
  1601. }
  1602. if (startCommand == NULL) {
  1603. ENetProtocol hostCommand = *command;
  1604. hostCommand.header.reliableSequenceNumber = startSequenceNumber;
  1605. startCommand = enet_peer_queue_incoming_command(peer, &hostCommand, NULL, totalLength, ENET_PACKET_FLAG_RELIABLE, fragmentCount);
  1606. if (startCommand == NULL)
  1607. return -1;
  1608. }
  1609. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1610. --startCommand->fragmentsRemaining;
  1611. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1612. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1613. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1614. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1615. if (startCommand->fragmentsRemaining <= 0)
  1616. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  1617. }
  1618. return 0;
  1619. }
  1620. static int enet_protocol_handle_send_unreliable_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1621. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, reliableSequenceNumber, startSequenceNumber, totalLength;
  1622. enet_uint16 reliableWindow, currentWindow;
  1623. ENetChannel* channel;
  1624. ENetListIterator currentCommand;
  1625. ENetIncomingCommand* startCommand = NULL;
  1626. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1627. return -1;
  1628. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1629. *currentData += fragmentLength;
  1630. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1631. return -1;
  1632. channel = &peer->channels[command->header.channelID];
  1633. reliableSequenceNumber = command->header.reliableSequenceNumber;
  1634. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1635. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1636. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1637. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1638. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  1639. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1640. return 0;
  1641. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && startSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  1642. return 0;
  1643. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1644. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1645. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1646. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1647. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1648. return -1;
  1649. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1650. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1651. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1652. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1653. continue;
  1654. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1655. break;
  1656. }
  1657. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  1658. break;
  1659. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  1660. continue;
  1661. if (incomingCommand->unreliableSequenceNumber <= startSequenceNumber) {
  1662. if (incomingCommand->unreliableSequenceNumber < startSequenceNumber)
  1663. break;
  1664. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1665. return -1;
  1666. startCommand = incomingCommand;
  1667. break;
  1668. }
  1669. }
  1670. if (startCommand == NULL) {
  1671. startCommand = enet_peer_queue_incoming_command(peer, command, NULL, totalLength,
  1672. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED, fragmentCount);
  1673. if (startCommand == NULL)
  1674. return -1;
  1675. }
  1676. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1677. --startCommand->fragmentsRemaining;
  1678. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1679. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1680. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1681. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1682. if (startCommand->fragmentsRemaining <= 0)
  1683. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  1684. }
  1685. return 0;
  1686. }
  1687. static int enet_protocol_handle_ping(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1688. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1689. return -1;
  1690. return 0;
  1691. }
  1692. static int enet_protocol_handle_bandwidth_limit(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1693. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1694. return -1;
  1695. if (peer->incomingBandwidth != 0)
  1696. --host->bandwidthLimitedPeers;
  1697. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.incomingBandwidth);
  1698. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.outgoingBandwidth);
  1699. if (peer->incomingBandwidth != 0)
  1700. ++host->bandwidthLimitedPeers;
  1701. if (peer->incomingBandwidth == 0 && host->outgoingBandwidth == 0)
  1702. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1703. else if (peer->incomingBandwidth == 0 || host->outgoingBandwidth == 0)
  1704. peer->windowSize = (ENET_MAX(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1705. else
  1706. peer->windowSize = (ENET_MIN(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1707. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1708. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1709. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1710. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1711. return 0;
  1712. }
  1713. static int enet_protocol_handle_throttle_configure(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1714. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1715. return -1;
  1716. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleInterval);
  1717. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleAcceleration);
  1718. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleDeceleration);
  1719. return 0;
  1720. }
  1721. static int enet_protocol_handle_disconnect(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1722. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT)
  1723. return 0;
  1724. enet_peer_reset_queues(peer);
  1725. if (peer->state == ENET_PEER_STATE_CONNECTION_SUCCEEDED || peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_CONNECTING) {
  1726. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1727. } else if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1728. if (peer->state == ENET_PEER_STATE_CONNECTION_PENDING)
  1729. host->recalculateBandwidthLimits = 1;
  1730. enet_peer_reset(peer);
  1731. } else if (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  1732. enet_protocol_change_state(host, peer, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT);
  1733. } else {
  1734. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1735. }
  1736. if (peer->state != ENET_PEER_STATE_DISCONNECTED)
  1737. peer->eventData = ENET_NET_TO_HOST_32(command->disconnect.data);
  1738. return 0;
  1739. }
  1740. static int enet_protocol_handle_acknowledge(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1741. enet_uint32 roundTripTime, receivedSentTime, receivedReliableSequenceNumber;
  1742. ENetProtocolCommand commandNumber;
  1743. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE)
  1744. return 0;
  1745. receivedSentTime = ENET_NET_TO_HOST_16(command->acknowledge.receivedSentTime);
  1746. receivedSentTime |= host->serviceTime & 0xFFFF0000;
  1747. if ((receivedSentTime & 0x8000) > (host->serviceTime & 0x8000))
  1748. receivedSentTime -= 0x10000;
  1749. if (ENET_TIME_LESS(host->serviceTime, receivedSentTime))
  1750. return 0;
  1751. peer->lastReceiveTime = host->serviceTime;
  1752. peer->earliestTimeout = 0;
  1753. roundTripTime = ENET_TIME_DIFFERENCE(host->serviceTime, receivedSentTime);
  1754. if (roundTripTime == 0)
  1755. roundTripTime = 1;
  1756. if (peer->smoothedRoundTripTime == 0)
  1757. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * ENET_SRTT_INITIAL + ENET_SRTT_PARA_G * roundTripTime);
  1758. else
  1759. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * peer->smoothedRoundTripTime + ENET_SRTT_PARA_G * roundTripTime);
  1760. enet_peer_throttle(peer, peer->smoothedRoundTripTime);
  1761. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1762. if (peer->smoothedRoundTripTime >= peer->roundTripTime) {
  1763. peer->roundTripTime += (peer->smoothedRoundTripTime - peer->roundTripTime) / 8;
  1764. peer->roundTripTimeVariance += (peer->smoothedRoundTripTime - peer->roundTripTime) / 4;
  1765. } else {
  1766. peer->roundTripTime -= (peer->roundTripTime - peer->smoothedRoundTripTime) / 8;
  1767. peer->roundTripTimeVariance += (peer->roundTripTime - peer->smoothedRoundTripTime) / 4;
  1768. }
  1769. if (peer->roundTripTime < peer->lowestRoundTripTime)
  1770. peer->lowestRoundTripTime = peer->roundTripTime;
  1771. if (peer->roundTripTimeVariance > peer->highestRoundTripTimeVariance)
  1772. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1773. if (peer->packetThrottleEpoch == 0 || ENET_TIME_DIFFERENCE(host->serviceTime, peer->packetThrottleEpoch) >= peer->packetThrottleInterval) {
  1774. peer->lastRoundTripTime = peer->lowestRoundTripTime;
  1775. peer->lastRoundTripTimeVariance = peer->highestRoundTripTimeVariance;
  1776. peer->lowestRoundTripTime = peer->roundTripTime;
  1777. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1778. peer->packetThrottleEpoch = host->serviceTime;
  1779. }
  1780. receivedReliableSequenceNumber = ENET_NET_TO_HOST_16(command->acknowledge.receivedReliableSequenceNumber);
  1781. commandNumber = enet_protocol_remove_sent_reliable_command(peer, receivedReliableSequenceNumber, command->header.channelID);
  1782. switch (peer->state) {
  1783. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1784. if (commandNumber != ENET_PROTOCOL_COMMAND_VERIFY_CONNECT)
  1785. return -1;
  1786. enet_protocol_notify_connect(host, peer, event);
  1787. break;
  1788. case ENET_PEER_STATE_DISCONNECTING:
  1789. if (commandNumber != ENET_PROTOCOL_COMMAND_DISCONNECT)
  1790. return -1;
  1791. enet_protocol_notify_disconnect(host, peer, event);
  1792. break;
  1793. case ENET_PEER_STATE_DISCONNECT_LATER:
  1794. if (enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1795. enet_peer_disconnect(peer, peer->eventData);
  1796. break;
  1797. default:
  1798. break;
  1799. }
  1800. return 0;
  1801. }
  1802. static int enet_protocol_handle_verify_connect(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1803. enet_uint32 mtu, windowSize;
  1804. size_t channelCount;
  1805. if (peer->state != ENET_PEER_STATE_CONNECTING)
  1806. return 0;
  1807. channelCount = ENET_NET_TO_HOST_32(command->verifyConnect.channelCount);
  1808. 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) {
  1809. peer->eventData = 0;
  1810. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1811. return -1;
  1812. }
  1813. enet_protocol_remove_sent_reliable_command(peer, 1, 0xFF);
  1814. if (channelCount < peer->channelCount)
  1815. peer->channelCount = channelCount;
  1816. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->verifyConnect.outgoingPeerID);
  1817. peer->incomingSessionID = command->verifyConnect.incomingSessionID;
  1818. peer->outgoingSessionID = command->verifyConnect.outgoingSessionID;
  1819. mtu = ENET_NET_TO_HOST_32(command->verifyConnect.mtu);
  1820. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1821. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1822. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1823. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1824. if (mtu < peer->mtu)
  1825. peer->mtu = mtu;
  1826. windowSize = ENET_NET_TO_HOST_32(command->verifyConnect.windowSize);
  1827. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1828. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1829. if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1830. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1831. if (windowSize < peer->windowSize)
  1832. peer->windowSize = windowSize;
  1833. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.incomingBandwidth);
  1834. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.outgoingBandwidth);
  1835. enet_protocol_notify_connect(host, peer, event);
  1836. return 0;
  1837. }
  1838. static int enet_protocol_handle_incoming_commands(ENetHost* host, ENetEvent* event) {
  1839. ENetProtocolHeader* header;
  1840. ENetProtocol* command;
  1841. ENetPeer* peer;
  1842. enet_uint8* currentData;
  1843. size_t headerSize;
  1844. enet_uint16 peerID, flags;
  1845. enet_uint8 sessionID;
  1846. if (host->receivedDataLength < (size_t)&((ENetProtocolHeader*)0)->sentTime)
  1847. return 0;
  1848. header = (ENetProtocolHeader*)host->receivedData;
  1849. peerID = ENET_NET_TO_HOST_16(header->peerID);
  1850. sessionID = (peerID & ENET_PROTOCOL_HEADER_SESSION_MASK) >> ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  1851. flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK;
  1852. peerID &= ~(ENET_PROTOCOL_HEADER_FLAG_MASK | ENET_PROTOCOL_HEADER_SESSION_MASK);
  1853. headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof(ENetProtocolHeader) : (size_t)&((ENetProtocolHeader*)0)->sentTime);
  1854. if (host->checksumCallback != NULL)
  1855. headerSize += sizeof(enet_uint32);
  1856. if (peerID == ENET_PROTOCOL_MAXIMUM_PEER_ID) {
  1857. peer = NULL;
  1858. } else if (peerID >= host->peerCount) {
  1859. return 0;
  1860. } else {
  1861. peer = &host->peers[peerID];
  1862. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || ((!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))
  1863. return 0;
  1864. }
  1865. #ifdef ENET_LZ4
  1866. if (flags & ENET_PROTOCOL_HEADER_FLAG_COMPRESSED) {
  1867. size_t originalSize = LZ4_decompress_safe((const char*)host->receivedData + headerSize, (char*)host->packetData[1] + headerSize, host->receivedDataLength - headerSize, sizeof(host->packetData[1]) - headerSize);
  1868. if (originalSize <= 0 || originalSize > sizeof(host->packetData[1]) - headerSize)
  1869. return 0;
  1870. memcpy(host->packetData[1], header, headerSize);
  1871. host->receivedData = host->packetData[1];
  1872. host->receivedDataLength = headerSize + originalSize;
  1873. }
  1874. #endif
  1875. if (host->checksumCallback != NULL) {
  1876. enet_uint32* checksum = (enet_uint32*)&host->receivedData[headerSize - sizeof(enet_uint32)];
  1877. enet_uint32 desiredChecksum = *checksum;
  1878. ENetBuffer buffer;
  1879. *checksum = peer != NULL ? peer->connectID : 0;
  1880. buffer.data = host->receivedData;
  1881. buffer.dataLength = host->receivedDataLength;
  1882. if (host->checksumCallback(&buffer, 1) != desiredChecksum)
  1883. return 0;
  1884. }
  1885. if (peer != NULL) {
  1886. peer->address.ipv6 = host->receivedAddress.ipv6;
  1887. peer->address.port = host->receivedAddress.port;
  1888. peer->incomingDataTotal += host->receivedDataLength;
  1889. peer->totalDataReceived += host->receivedDataLength;
  1890. }
  1891. currentData = host->receivedData + headerSize;
  1892. while (currentData < &host->receivedData[host->receivedDataLength]) {
  1893. enet_uint8 commandNumber;
  1894. size_t commandSize;
  1895. command = (ENetProtocol*)currentData;
  1896. if (currentData + sizeof(ENetProtocolCommandHeader) > &host->receivedData[host->receivedDataLength])
  1897. break;
  1898. commandNumber = command->header.command & ENET_PROTOCOL_COMMAND_MASK;
  1899. if (commandNumber >= ENET_PROTOCOL_COMMAND_COUNT)
  1900. break;
  1901. commandSize = commandSizes[commandNumber];
  1902. if (commandSize == 0 || currentData + commandSize > &host->receivedData[host->receivedDataLength])
  1903. break;
  1904. currentData += commandSize;
  1905. if (peer == NULL && (commandNumber != ENET_PROTOCOL_COMMAND_CONNECT || currentData < &host->receivedData[host->receivedDataLength]))
  1906. break;
  1907. command->header.reliableSequenceNumber = ENET_NET_TO_HOST_16(command->header.reliableSequenceNumber);
  1908. switch (commandNumber) {
  1909. case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE:
  1910. if (enet_protocol_handle_acknowledge(host, event, peer, command))
  1911. goto commandError;
  1912. break;
  1913. case ENET_PROTOCOL_COMMAND_CONNECT:
  1914. if (peer != NULL)
  1915. goto commandError;
  1916. if (host->preventConnections == 0) {
  1917. peer = enet_protocol_handle_connect(host, header, command);
  1918. if (peer == NULL)
  1919. goto commandError;
  1920. }
  1921. break;
  1922. case ENET_PROTOCOL_COMMAND_VERIFY_CONNECT:
  1923. if (enet_protocol_handle_verify_connect(host, event, peer, command))
  1924. goto commandError;
  1925. break;
  1926. case ENET_PROTOCOL_COMMAND_DISCONNECT:
  1927. if (enet_protocol_handle_disconnect(host, peer, command))
  1928. goto commandError;
  1929. break;
  1930. case ENET_PROTOCOL_COMMAND_PING:
  1931. if (enet_protocol_handle_ping(host, peer, command))
  1932. goto commandError;
  1933. break;
  1934. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  1935. if (enet_protocol_handle_send_reliable(host, peer, command, &currentData))
  1936. goto commandError;
  1937. break;
  1938. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  1939. if (enet_protocol_handle_send_unreliable(host, peer, command, &currentData))
  1940. goto commandError;
  1941. break;
  1942. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  1943. if (enet_protocol_handle_send_unsequenced(host, peer, command, &currentData))
  1944. goto commandError;
  1945. break;
  1946. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  1947. if (enet_protocol_handle_send_fragment(host, peer, command, &currentData))
  1948. goto commandError;
  1949. break;
  1950. case ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT:
  1951. if (enet_protocol_handle_bandwidth_limit(host, peer, command))
  1952. goto commandError;
  1953. break;
  1954. case ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE:
  1955. if (enet_protocol_handle_throttle_configure(host, peer, command))
  1956. goto commandError;
  1957. break;
  1958. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  1959. if (enet_protocol_handle_send_unreliable_fragment(host, peer, command, &currentData))
  1960. goto commandError;
  1961. break;
  1962. default:
  1963. goto commandError;
  1964. }
  1965. if (peer != NULL && (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0) {
  1966. enet_uint16 sentTime;
  1967. if (!(flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME))
  1968. break;
  1969. sentTime = ENET_NET_TO_HOST_16(header->sentTime);
  1970. switch (peer->state) {
  1971. case ENET_PEER_STATE_DISCONNECTING:
  1972. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1973. case ENET_PEER_STATE_DISCONNECTED:
  1974. case ENET_PEER_STATE_ZOMBIE:
  1975. break;
  1976. case ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT:
  1977. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  1978. enet_peer_queue_acknowledgement(peer, command, sentTime);
  1979. break;
  1980. default:
  1981. enet_peer_queue_acknowledgement(peer, command, sentTime);
  1982. break;
  1983. }
  1984. }
  1985. }
  1986. commandError:
  1987. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  1988. return 1;
  1989. return 0;
  1990. }
  1991. static int enet_protocol_receive_incoming_commands(ENetHost* host, ENetEvent* event) {
  1992. int packets;
  1993. for (packets = 0; packets < 256; ++packets) {
  1994. int receivedLength;
  1995. ENetBuffer buffer;
  1996. buffer.data = host->packetData[0];
  1997. buffer.dataLength = host->mtu;
  1998. receivedLength = enet_socket_receive(host->socket, &host->receivedAddress, &buffer, 1);
  1999. if (receivedLength == -2)
  2000. continue;
  2001. if (receivedLength < 0)
  2002. return -1;
  2003. if (receivedLength == 0)
  2004. return 0;
  2005. host->receivedData = host->packetData[0];
  2006. host->receivedDataLength = receivedLength;
  2007. host->totalReceivedData += receivedLength;
  2008. host->totalReceivedPackets++;
  2009. if (host->interceptCallback != NULL) {
  2010. switch (host->interceptCallback(host, (void*)event)) {
  2011. case 1:
  2012. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2013. return 1;
  2014. continue;
  2015. case -1:
  2016. return -1;
  2017. default:
  2018. break;
  2019. }
  2020. }
  2021. switch (enet_protocol_handle_incoming_commands(host, event)) {
  2022. case 1:
  2023. return 1;
  2024. case -1:
  2025. return -1;
  2026. default:
  2027. break;
  2028. }
  2029. }
  2030. return -1;
  2031. }
  2032. static void enet_protocol_send_acknowledgements(ENetHost* host, ENetPeer* peer) {
  2033. ENetProtocol* command = &host->commands[host->commandCount];
  2034. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2035. ENetAcknowledgement* acknowledgement;
  2036. ENetListIterator currentAcknowledgement;
  2037. enet_uint16 reliableSequenceNumber;
  2038. currentAcknowledgement = enet_list_begin(&peer->acknowledgements);
  2039. while (currentAcknowledgement != enet_list_end(&peer->acknowledgements)) {
  2040. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < sizeof(ENetProtocolAcknowledge)) {
  2041. host->continueSending = 1;
  2042. break;
  2043. }
  2044. acknowledgement = (ENetAcknowledgement*)currentAcknowledgement;
  2045. currentAcknowledgement = enet_list_next(currentAcknowledgement);
  2046. buffer->data = command;
  2047. buffer->dataLength = sizeof(ENetProtocolAcknowledge);
  2048. host->packetSize += buffer->dataLength;
  2049. reliableSequenceNumber = ENET_HOST_TO_NET_16(acknowledgement->command.header.reliableSequenceNumber);
  2050. command->header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
  2051. command->header.channelID = acknowledgement->command.header.channelID;
  2052. command->header.reliableSequenceNumber = reliableSequenceNumber;
  2053. command->acknowledge.receivedReliableSequenceNumber = reliableSequenceNumber;
  2054. command->acknowledge.receivedSentTime = ENET_HOST_TO_NET_16(acknowledgement->sentTime);
  2055. if ((acknowledgement->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2056. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  2057. enet_list_remove(&acknowledgement->acknowledgementList);
  2058. enet_free(acknowledgement);
  2059. ++command;
  2060. ++buffer;
  2061. }
  2062. host->commandCount = command - host->commands;
  2063. host->bufferCount = buffer - host->buffers;
  2064. }
  2065. static void enet_protocol_send_unreliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2066. ENetProtocol* command = &host->commands[host->commandCount];
  2067. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2068. ENetOutgoingCommand* outgoingCommand;
  2069. ENetListIterator currentCommand;
  2070. currentCommand = enet_list_begin(&peer->outgoingUnreliableCommands);
  2071. while (currentCommand != enet_list_end(&peer->outgoingUnreliableCommands)) {
  2072. size_t commandSize;
  2073. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2074. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2075. 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 && peer->mtu - host->packetSize < commandSize + outgoingCommand->fragmentLength)) {
  2076. host->continueSending = 1;
  2077. break;
  2078. }
  2079. currentCommand = enet_list_next(currentCommand);
  2080. if (outgoingCommand->packet != NULL && outgoingCommand->fragmentOffset == 0) {
  2081. peer->packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER;
  2082. peer->packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE;
  2083. if (peer->packetThrottleCounter > peer->packetThrottle) {
  2084. enet_uint16 reliableSequenceNumber = outgoingCommand->reliableSequenceNumber;
  2085. enet_uint16 unreliableSequenceNumber = outgoingCommand->unreliableSequenceNumber;
  2086. for (;;) {
  2087. --outgoingCommand->packet->referenceCount;
  2088. if (outgoingCommand->packet->referenceCount == 0)
  2089. enet_packet_destroy(outgoingCommand->packet);
  2090. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2091. enet_free(outgoingCommand);
  2092. if (currentCommand == enet_list_end(&peer->outgoingUnreliableCommands))
  2093. break;
  2094. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2095. if (outgoingCommand->reliableSequenceNumber != reliableSequenceNumber || outgoingCommand->unreliableSequenceNumber != unreliableSequenceNumber)
  2096. break;
  2097. currentCommand = enet_list_next(currentCommand);
  2098. }
  2099. continue;
  2100. }
  2101. }
  2102. buffer->data = command;
  2103. buffer->dataLength = commandSize;
  2104. host->packetSize += buffer->dataLength;
  2105. *command = outgoingCommand->command;
  2106. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2107. if (outgoingCommand->packet != NULL) {
  2108. ++buffer;
  2109. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2110. buffer->dataLength = outgoingCommand->fragmentLength;
  2111. host->packetSize += buffer->dataLength;
  2112. enet_list_insert(enet_list_end(&peer->sentUnreliableCommands), outgoingCommand);
  2113. } else {
  2114. enet_free(outgoingCommand);
  2115. }
  2116. ++command;
  2117. ++buffer;
  2118. }
  2119. host->commandCount = command - host->commands;
  2120. host->bufferCount = buffer - host->buffers;
  2121. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands) && enet_list_empty(&peer->sentUnreliableCommands))
  2122. enet_peer_disconnect(peer, peer->eventData);
  2123. }
  2124. static int enet_protocol_check_timeouts(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  2125. ENetOutgoingCommand* outgoingCommand;
  2126. ENetListIterator currentCommand, insertPosition;
  2127. currentCommand = enet_list_begin(&peer->sentReliableCommands);
  2128. insertPosition = enet_list_begin(&peer->outgoingReliableCommands);
  2129. while (currentCommand != enet_list_end(&peer->sentReliableCommands)) {
  2130. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2131. currentCommand = enet_list_next(currentCommand);
  2132. if (ENET_TIME_DIFFERENCE(host->serviceTime, outgoingCommand->sentTime) < outgoingCommand->roundTripTimeout)
  2133. continue;
  2134. if (peer->earliestTimeout == 0 || ENET_TIME_LESS(outgoingCommand->sentTime, peer->earliestTimeout))
  2135. peer->earliestTimeout = outgoingCommand->sentTime;
  2136. if (peer->earliestTimeout != 0 && (ENET_TIME_DIFFERENCE(host->serviceTime, peer->earliestTimeout) >= peer->timeoutMaximum || (outgoingCommand->roundTripTimeout >= outgoingCommand->roundTripTimeoutLimit && ENET_TIME_DIFFERENCE(host->serviceTime, peer->earliestTimeout) >= peer->timeoutMinimum))) {
  2137. enet_protocol_notify_disconnect_timeout(host, peer, event);
  2138. return 1;
  2139. }
  2140. if (outgoingCommand->packet != NULL)
  2141. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  2142. ++peer->packetsLost;
  2143. ++peer->totalPacketsLost;
  2144. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2145. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2146. enet_list_insert(insertPosition, enet_list_remove(&outgoingCommand->outgoingCommandList));
  2147. if (currentCommand == enet_list_begin(&peer->sentReliableCommands) && !enet_list_empty(&peer->sentReliableCommands)) {
  2148. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2149. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  2150. }
  2151. }
  2152. return 0;
  2153. }
  2154. static int enet_protocol_send_reliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2155. ENetProtocol* command = &host->commands[host->commandCount];
  2156. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2157. ENetOutgoingCommand* outgoingCommand;
  2158. ENetListIterator currentCommand;
  2159. ENetChannel* channel;
  2160. enet_uint16 reliableWindow;
  2161. size_t commandSize;
  2162. int windowExceeded = 0, windowWrap = 0, canPing = 1;
  2163. currentCommand = enet_list_begin(&peer->outgoingReliableCommands);
  2164. while (currentCommand != enet_list_end(&peer->outgoingReliableCommands)) {
  2165. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2166. channel = outgoingCommand->command.header.channelID < peer->channelCount ? &peer->channels[outgoingCommand->command.header.channelID] : NULL;
  2167. reliableWindow = outgoingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2168. if (channel != NULL) {
  2169. if (!windowWrap && outgoingCommand->sendAttempts < 1 && !(outgoingCommand->reliableSequenceNumber % ENET_PEER_RELIABLE_WINDOW_SIZE) && (channel->reliableWindows[(reliableWindow + ENET_PEER_RELIABLE_WINDOWS - 1) % ENET_PEER_RELIABLE_WINDOWS] >= ENET_PEER_RELIABLE_WINDOW_SIZE || channel->usedReliableWindows & ((((1 << ENET_PEER_FREE_RELIABLE_WINDOWS) - 1) << reliableWindow) | (((1 << ENET_PEER_FREE_RELIABLE_WINDOWS) - 1) >> (ENET_PEER_RELIABLE_WINDOWS - reliableWindow)))))
  2170. windowWrap = 1;
  2171. if (windowWrap) {
  2172. currentCommand = enet_list_next(currentCommand);
  2173. continue;
  2174. }
  2175. }
  2176. if (outgoingCommand->packet != NULL) {
  2177. if (!windowExceeded) {
  2178. enet_uint32 windowSize = (peer->packetThrottle * peer->windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE;
  2179. if (peer->reliableDataInTransit + outgoingCommand->fragmentLength > ENET_MAX(windowSize, peer->mtu))
  2180. windowExceeded = 1;
  2181. }
  2182. if (windowExceeded) {
  2183. currentCommand = enet_list_next(currentCommand);
  2184. continue;
  2185. }
  2186. }
  2187. canPing = 0;
  2188. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2189. 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 && (enet_uint16)(peer->mtu - host->packetSize) < (enet_uint16)(commandSize + outgoingCommand->fragmentLength))) {
  2190. host->continueSending = 1;
  2191. break;
  2192. }
  2193. currentCommand = enet_list_next(currentCommand);
  2194. if (channel != NULL && outgoingCommand->sendAttempts < 1) {
  2195. channel->usedReliableWindows |= 1 << reliableWindow;
  2196. ++channel->reliableWindows[reliableWindow];
  2197. }
  2198. ++outgoingCommand->sendAttempts;
  2199. if (outgoingCommand->roundTripTimeout == 0) {
  2200. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2201. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2202. }
  2203. if (enet_list_empty(&peer->sentReliableCommands))
  2204. peer->nextTimeout = host->serviceTime + outgoingCommand->roundTripTimeout;
  2205. enet_list_insert(enet_list_end(&peer->sentReliableCommands), enet_list_remove(&outgoingCommand->outgoingCommandList));
  2206. outgoingCommand->sentTime = host->serviceTime;
  2207. buffer->data = command;
  2208. buffer->dataLength = commandSize;
  2209. host->packetSize += buffer->dataLength;
  2210. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_SENT_TIME;
  2211. *command = outgoingCommand->command;
  2212. if (outgoingCommand->packet != NULL) {
  2213. ++buffer;
  2214. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2215. buffer->dataLength = outgoingCommand->fragmentLength;
  2216. host->packetSize += outgoingCommand->fragmentLength;
  2217. peer->reliableDataInTransit += outgoingCommand->fragmentLength;
  2218. }
  2219. ++peer->packetsSent;
  2220. ++peer->totalPacketsSent;
  2221. ++command;
  2222. ++buffer;
  2223. }
  2224. host->commandCount = command - host->commands;
  2225. host->bufferCount = buffer - host->buffers;
  2226. return canPing;
  2227. }
  2228. static int enet_protocol_send_outgoing_commands(ENetHost* host, ENetEvent* event, int checkForTimeouts) {
  2229. enet_uint8 headerData[sizeof(ENetProtocolHeader) + sizeof(enet_uint32)];
  2230. ENetProtocolHeader* header = (ENetProtocolHeader*)headerData;
  2231. ENetPeer* currentPeer;
  2232. int sentLength;
  2233. host->continueSending = 1;
  2234. #ifdef ENET_LZ4
  2235. size_t shouldCompress = 0;
  2236. #endif
  2237. while (host->continueSending) {
  2238. for (host->continueSending = 0, currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2239. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED || currentPeer->state == ENET_PEER_STATE_ZOMBIE)
  2240. continue;
  2241. host->headerFlags = 0;
  2242. host->commandCount = 0;
  2243. host->bufferCount = 1;
  2244. host->packetSize = sizeof(ENetProtocolHeader);
  2245. if (!enet_list_empty(&currentPeer->acknowledgements))
  2246. enet_protocol_send_acknowledgements(host, currentPeer);
  2247. if (checkForTimeouts != 0 && !enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_GREATER_EQUAL(host->serviceTime, currentPeer->nextTimeout) && enet_protocol_check_timeouts(host, currentPeer, event) == 1) {
  2248. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2249. return 1;
  2250. else
  2251. continue;
  2252. }
  2253. if ((enet_list_empty(&currentPeer->outgoingReliableCommands) || enet_protocol_send_reliable_outgoing_commands(host, currentPeer)) && enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->lastReceiveTime) >= currentPeer->pingInterval && currentPeer->mtu - host->packetSize >= sizeof(ENetProtocolPing)) {
  2254. enet_peer_ping(currentPeer);
  2255. enet_protocol_send_reliable_outgoing_commands(host, currentPeer);
  2256. }
  2257. if (!enet_list_empty(&currentPeer->outgoingUnreliableCommands))
  2258. enet_protocol_send_unreliable_outgoing_commands(host, currentPeer);
  2259. if (host->commandCount == 0)
  2260. continue;
  2261. if (currentPeer->packetLossEpoch == 0) {
  2262. currentPeer->packetLossEpoch = host->serviceTime;
  2263. } else if (ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->packetLossEpoch) >= ENET_PEER_PACKET_LOSS_INTERVAL && currentPeer->packetsSent > 0) {
  2264. enet_uint32 packetLoss = currentPeer->packetsLost * ENET_PEER_PACKET_LOSS_SCALE / currentPeer->packetsSent;
  2265. ENET_LOG_TRACE(
  2266. "peer %u: %f%%+-%f%% packet loss, %u+-%u ms round trip time, %f%% throttle, %u/%u outgoing, %u/%u incoming\n", currentPeer->incomingPeerID,
  2267. currentPeer->packetLoss / (float)ENET_PEER_PACKET_LOSS_SCALE,
  2268. currentPeer->packetLossVariance / (float)ENET_PEER_PACKET_LOSS_SCALE, currentPeer->roundTripTime, currentPeer->roundTripTimeVariance,
  2269. currentPeer->packetThrottle / (float)ENET_PEER_PACKET_THROTTLE_SCALE,
  2270. enet_list_size(&currentPeer->outgoingReliableCommands),
  2271. enet_list_size(&currentPeer->outgoingUnreliableCommands),
  2272. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingReliableCommands) : 0,
  2273. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingUnreliableCommands) : 0
  2274. );
  2275. currentPeer->packetLossVariance -= currentPeer->packetLossVariance / 4;
  2276. if (packetLoss >= currentPeer->packetLoss) {
  2277. currentPeer->packetLoss += (packetLoss - currentPeer->packetLoss) / 8;
  2278. currentPeer->packetLossVariance += (packetLoss - currentPeer->packetLoss) / 4;
  2279. } else {
  2280. currentPeer->packetLoss -= (currentPeer->packetLoss - packetLoss) / 8;
  2281. currentPeer->packetLossVariance += (currentPeer->packetLoss - packetLoss) / 4;
  2282. }
  2283. currentPeer->packetLossEpoch = host->serviceTime;
  2284. currentPeer->packetsSent = 0;
  2285. currentPeer->packetsLost = 0;
  2286. }
  2287. host->buffers->data = headerData;
  2288. if (host->headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME) {
  2289. header->sentTime = ENET_HOST_TO_NET_16(host->serviceTime & 0xFFFF);
  2290. host->buffers->dataLength = sizeof(ENetProtocolHeader);
  2291. } else {
  2292. host->buffers->dataLength = (size_t)&((ENetProtocolHeader*)0)->sentTime;
  2293. }
  2294. #ifdef ENET_LZ4
  2295. if (host->compression == 1 && host->packetSize > 64) {
  2296. size_t originalSize = host->packetSize - sizeof(ENetProtocolHeader), compressedSize = 0;
  2297. const ENetBuffer* buffers = &host->buffers[1];
  2298. if (host->compressionBufferSize < originalSize) {
  2299. enet_free(host->compressionBuffer);
  2300. host->compressionBuffer = (char*)enet_malloc(originalSize);
  2301. host->compressionBufferSize = originalSize;
  2302. }
  2303. size_t totalSize = originalSize, dataSize = 0;
  2304. while (totalSize) {
  2305. size_t i;
  2306. for (i = 0; i < host->bufferCount - 1; i++) {
  2307. size_t copySize = ENET_MIN(totalSize, buffers[i].dataLength);
  2308. memcpy(host->compressionBuffer + dataSize, buffers[i].data, copySize);
  2309. totalSize -= copySize;
  2310. dataSize += copySize;
  2311. }
  2312. }
  2313. compressedSize = LZ4_compress_default((const char*)host->compressionBuffer, (char*)host->packetData[1], dataSize, originalSize);
  2314. if (compressedSize > 0 && compressedSize < originalSize) {
  2315. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_COMPRESSED;
  2316. shouldCompress = compressedSize;
  2317. ENET_LOG_TRACE("peer %u: compressed %u->%u (%u%%)\n", currentPeer->incomingPeerID, originalSize, compressedSize, (compressedSize * 100) / originalSize);
  2318. }
  2319. }
  2320. #endif
  2321. if (currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2322. host->headerFlags |= currentPeer->outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  2323. header->peerID = ENET_HOST_TO_NET_16(currentPeer->outgoingPeerID | host->headerFlags);
  2324. if (host->checksumCallback != NULL) {
  2325. enet_uint32* checksum = (enet_uint32*)&headerData[host->buffers->dataLength];
  2326. *checksum = currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer->connectID : 0;
  2327. host->buffers->dataLength += sizeof(enet_uint32);
  2328. *checksum = host->checksumCallback(host->buffers, host->bufferCount);
  2329. }
  2330. #ifdef ENET_LZ4
  2331. if (shouldCompress > 0) {
  2332. host->buffers[1].data = host->packetData[1];
  2333. host->buffers[1].dataLength = shouldCompress;
  2334. host->bufferCount = 2;
  2335. }
  2336. #endif
  2337. currentPeer->lastSendTime = host->serviceTime;
  2338. sentLength = enet_socket_send(host->socket, &currentPeer->address, host->buffers, host->bufferCount);
  2339. enet_protocol_remove_sent_unreliable_commands(currentPeer);
  2340. if (sentLength < 0)
  2341. return -1;
  2342. host->totalSentData += sentLength;
  2343. currentPeer->totalDataSent += sentLength;
  2344. host->totalSentPackets++;
  2345. }
  2346. }
  2347. return 0;
  2348. }
  2349. void enet_host_flush(ENetHost* host) {
  2350. host->serviceTime = enet_time_get();
  2351. enet_protocol_send_outgoing_commands(host, NULL, 0);
  2352. }
  2353. int enet_host_check_events(ENetHost* host, ENetEvent* event) {
  2354. if (event == NULL)
  2355. return -1;
  2356. event->type = ENET_EVENT_TYPE_NONE;
  2357. event->peer = NULL;
  2358. event->packet = NULL;
  2359. return enet_protocol_dispatch_incoming_commands(host, event);
  2360. }
  2361. int enet_host_service(ENetHost* host, ENetEvent* event, enet_uint32 timeout) {
  2362. enet_uint32 waitCondition;
  2363. if (event != NULL) {
  2364. event->type = ENET_EVENT_TYPE_NONE;
  2365. event->peer = NULL;
  2366. event->packet = NULL;
  2367. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2368. case 1:
  2369. return 1;
  2370. case -1:
  2371. #ifdef ENET_DEBUG
  2372. ENET_LOG_ERROR("Error dispatching incoming packets");
  2373. #endif
  2374. return -1;
  2375. default:
  2376. break;
  2377. }
  2378. }
  2379. host->serviceTime = enet_time_get();
  2380. timeout += host->serviceTime;
  2381. do {
  2382. if (ENET_TIME_DIFFERENCE(host->serviceTime, host->bandwidthThrottleEpoch) >= ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  2383. enet_host_bandwidth_throttle(host);
  2384. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2385. case 1:
  2386. return 1;
  2387. case -1:
  2388. ENET_LOG_ERROR("Error sending outgoing packets");
  2389. return -1;
  2390. default:
  2391. break;
  2392. }
  2393. switch (enet_protocol_receive_incoming_commands(host, event)) {
  2394. case 1:
  2395. return 1;
  2396. case -1:
  2397. ENET_LOG_ERROR("Error receiving incoming packets");
  2398. return -1;
  2399. default:
  2400. break;
  2401. }
  2402. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2403. case 1:
  2404. return 1;
  2405. case -1:
  2406. ENET_LOG_ERROR("Error dispatching outgoing packets!");
  2407. return -1;
  2408. default:
  2409. break;
  2410. }
  2411. if (event != NULL) {
  2412. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2413. case 1:
  2414. return 1;
  2415. case -1:
  2416. ENET_LOG_ERROR("Error dispatching incoming packets!");
  2417. return -1;
  2418. default:
  2419. break;
  2420. }
  2421. }
  2422. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2423. return 0;
  2424. do {
  2425. host->serviceTime = enet_time_get();
  2426. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2427. return 0;
  2428. waitCondition = ENET_SOCKET_WAIT_RECEIVE | ENET_SOCKET_WAIT_INTERRUPT;
  2429. if (enet_socket_wait(host->socket, &waitCondition, ENET_TIME_DIFFERENCE(timeout, host->serviceTime)) != 0)
  2430. return -1;
  2431. }
  2432. while (waitCondition & ENET_SOCKET_WAIT_INTERRUPT);
  2433. host->serviceTime = enet_time_get();
  2434. }
  2435. while (waitCondition & ENET_SOCKET_WAIT_RECEIVE);
  2436. return 0;
  2437. }
  2438. /*
  2439. =======================================================================
  2440. Peer
  2441. =======================================================================
  2442. */
  2443. void enet_peer_throttle_configure(ENetPeer* peer, enet_uint32 interval, enet_uint32 acceleration, enet_uint32 deceleration, enet_uint32 threshold) {
  2444. ENetProtocol command;
  2445. peer->packetThrottleThreshold = threshold;
  2446. peer->packetThrottleInterval = interval;
  2447. peer->packetThrottleAcceleration = acceleration;
  2448. peer->packetThrottleDeceleration = deceleration;
  2449. command.header.command = ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2450. command.header.channelID = 0xFF;
  2451. command.throttleConfigure.packetThrottleInterval = ENET_HOST_TO_NET_32(interval);
  2452. command.throttleConfigure.packetThrottleAcceleration = ENET_HOST_TO_NET_32(acceleration);
  2453. command.throttleConfigure.packetThrottleDeceleration = ENET_HOST_TO_NET_32(deceleration);
  2454. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2455. }
  2456. int enet_peer_throttle(ENetPeer* peer, enet_uint32 rtt) {
  2457. if (peer->lastRoundTripTime <= peer->lastRoundTripTimeVariance) {
  2458. peer->packetThrottle = peer->packetThrottleLimit;
  2459. } else if (rtt < peer->lastRoundTripTime) {
  2460. peer->packetThrottle += peer->packetThrottleAcceleration;
  2461. if (peer->packetThrottle > peer->packetThrottleLimit)
  2462. peer->packetThrottle = peer->packetThrottleLimit;
  2463. return 1;
  2464. } else if (rtt > peer->lastRoundTripTime + peer->packetThrottleThreshold + 2 * peer->lastRoundTripTimeVariance) {
  2465. if (peer->packetThrottle > peer->packetThrottleDeceleration)
  2466. peer->packetThrottle -= peer->packetThrottleDeceleration;
  2467. else
  2468. peer->packetThrottle = 0;
  2469. return -1;
  2470. }
  2471. return 0;
  2472. }
  2473. int enet_peer_send(ENetPeer* peer, enet_uint8 channelID, ENetPacket* packet) {
  2474. ENetChannel* channel = &peer->channels[channelID];
  2475. ENetProtocol command;
  2476. size_t fragmentLength;
  2477. if (peer->state != ENET_PEER_STATE_CONNECTED || channelID >= peer->channelCount || packet->dataLength > peer->host->maximumPacketSize) {
  2478. ENET_LOG_ERROR("Cannot send data. Peer is not connected, the channel id is above the maximum channels supported or the packet data length is above the maximum packet size");
  2479. return -1;
  2480. }
  2481. fragmentLength = peer->mtu - sizeof(ENetProtocolHeader) - sizeof(ENetProtocolSendFragment);
  2482. if (peer->host->checksumCallback != NULL)
  2483. fragmentLength -= sizeof(enet_uint32);
  2484. if (packet->dataLength > fragmentLength) {
  2485. enet_uint32 fragmentCount = (packet->dataLength + fragmentLength - 1) / fragmentLength, fragmentNumber, fragmentOffset;
  2486. enet_uint8 commandNumber;
  2487. enet_uint16 startSequenceNumber;
  2488. ENetList fragments;
  2489. ENetOutgoingCommand* fragment;
  2490. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT) {
  2491. ENET_LOG_ERROR("Cannot send data. Too many fragments (%u vs %u)", fragmentCount, ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT);
  2492. return -1;
  2493. }
  2494. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED)) == ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED && channel->outgoingUnreliableSequenceNumber < 0xFFFF) {
  2495. commandNumber = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT;
  2496. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingUnreliableSequenceNumber + 1);
  2497. } else {
  2498. commandNumber = ENET_PROTOCOL_COMMAND_SEND_FRAGMENT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2499. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingReliableSequenceNumber + 1);
  2500. }
  2501. enet_list_clear(&fragments);
  2502. for (fragmentNumber = 0, fragmentOffset = 0; fragmentOffset < packet->dataLength; ++fragmentNumber, fragmentOffset += fragmentLength) {
  2503. if (packet->dataLength - fragmentOffset < fragmentLength)
  2504. fragmentLength = packet->dataLength - fragmentOffset;
  2505. fragment = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2506. if (fragment == NULL) {
  2507. while (!enet_list_empty(&fragments)) {
  2508. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2509. enet_free(fragment);
  2510. }
  2511. ENET_LOG_ERROR("Cannot send data. A fragment was null.");
  2512. return -1;
  2513. }
  2514. fragment->fragmentOffset = fragmentOffset;
  2515. fragment->fragmentLength = fragmentLength;
  2516. fragment->packet = packet;
  2517. fragment->command.header.command = commandNumber;
  2518. fragment->command.header.channelID = channelID;
  2519. fragment->command.sendFragment.startSequenceNumber = startSequenceNumber;
  2520. fragment->command.sendFragment.dataLength = ENET_HOST_TO_NET_16(fragmentLength);
  2521. fragment->command.sendFragment.fragmentCount = ENET_HOST_TO_NET_32(fragmentCount);
  2522. fragment->command.sendFragment.fragmentNumber = ENET_HOST_TO_NET_32(fragmentNumber);
  2523. fragment->command.sendFragment.totalLength = ENET_HOST_TO_NET_32(packet->dataLength);
  2524. fragment->command.sendFragment.fragmentOffset = ENET_NET_TO_HOST_32(fragmentOffset);
  2525. enet_list_insert(enet_list_end(&fragments), fragment);
  2526. }
  2527. packet->referenceCount += fragmentNumber;
  2528. while (!enet_list_empty(&fragments)) {
  2529. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2530. enet_peer_setup_outgoing_command(peer, fragment);
  2531. }
  2532. return 0;
  2533. }
  2534. command.header.channelID = channelID;
  2535. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNSEQUENCED)) == ENET_PACKET_FLAG_UNSEQUENCED) {
  2536. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2537. command.sendUnsequenced.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2538. } else if (packet->flags & ENET_PACKET_FLAG_RELIABLE || channel->outgoingUnreliableSequenceNumber >= 0xFFFF) {
  2539. command.header.command = ENET_PROTOCOL_COMMAND_SEND_RELIABLE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2540. command.sendReliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2541. } else {
  2542. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE;
  2543. command.sendUnreliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2544. }
  2545. if (enet_peer_queue_outgoing_command(peer, &command, packet, 0, packet->dataLength) == NULL)
  2546. return -1;
  2547. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  2548. enet_host_flush(peer->host);
  2549. return 0;
  2550. }
  2551. ENetPacket* enet_peer_receive(ENetPeer* peer, enet_uint8* channelID) {
  2552. ENetIncomingCommand* incomingCommand;
  2553. ENetPacket* packet;
  2554. if (enet_list_empty(&peer->dispatchedCommands))
  2555. return NULL;
  2556. incomingCommand = (ENetIncomingCommand*)enet_list_remove(enet_list_begin(&peer->dispatchedCommands));
  2557. if (channelID != NULL)
  2558. *channelID = incomingCommand->command.header.channelID;
  2559. packet = incomingCommand->packet;
  2560. --packet->referenceCount;
  2561. if (incomingCommand->fragments != NULL)
  2562. enet_free(incomingCommand->fragments);
  2563. enet_free(incomingCommand);
  2564. peer->totalWaitingData -= packet->dataLength;
  2565. return packet;
  2566. }
  2567. static void enet_peer_reset_outgoing_commands(ENetList* queue) {
  2568. ENetOutgoingCommand* outgoingCommand;
  2569. while (!enet_list_empty(queue)) {
  2570. outgoingCommand = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(queue));
  2571. if (outgoingCommand->packet != NULL) {
  2572. --outgoingCommand->packet->referenceCount;
  2573. if (outgoingCommand->packet->referenceCount == 0)
  2574. enet_packet_destroy(outgoingCommand->packet);
  2575. }
  2576. enet_free(outgoingCommand);
  2577. }
  2578. }
  2579. static void enet_peer_remove_incoming_commands(ENetList* queue, ENetListIterator startCommand, ENetListIterator endCommand) {
  2580. ENetListIterator currentCommand;
  2581. for (currentCommand = startCommand; currentCommand != endCommand;) {
  2582. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2583. currentCommand = enet_list_next(currentCommand);
  2584. enet_list_remove(&incomingCommand->incomingCommandList);
  2585. if (incomingCommand->packet != NULL) {
  2586. --incomingCommand->packet->referenceCount;
  2587. if (incomingCommand->packet->referenceCount == 0)
  2588. enet_packet_destroy(incomingCommand->packet);
  2589. }
  2590. if (incomingCommand->fragments != NULL)
  2591. enet_free(incomingCommand->fragments);
  2592. enet_free(incomingCommand);
  2593. }
  2594. }
  2595. static void enet_peer_reset_incoming_commands(ENetList* queue) {
  2596. enet_peer_remove_incoming_commands(queue, enet_list_begin(queue), enet_list_end(queue));
  2597. }
  2598. void enet_peer_reset_queues(ENetPeer* peer) {
  2599. ENetChannel* channel;
  2600. if (peer->needsDispatch) {
  2601. enet_list_remove(&peer->dispatchList);
  2602. peer->needsDispatch = 0;
  2603. }
  2604. while (!enet_list_empty(&peer->acknowledgements)) {
  2605. enet_free(enet_list_remove(enet_list_begin(&peer->acknowledgements)));
  2606. }
  2607. enet_peer_reset_outgoing_commands(&peer->sentReliableCommands);
  2608. enet_peer_reset_outgoing_commands(&peer->sentUnreliableCommands);
  2609. enet_peer_reset_outgoing_commands(&peer->outgoingReliableCommands);
  2610. enet_peer_reset_outgoing_commands(&peer->outgoingUnreliableCommands);
  2611. enet_peer_reset_incoming_commands(&peer->dispatchedCommands);
  2612. if (peer->channels != NULL && peer->channelCount > 0) {
  2613. for (channel = peer->channels; channel < &peer->channels[peer->channelCount]; ++channel) {
  2614. enet_peer_reset_incoming_commands(&channel->incomingReliableCommands);
  2615. enet_peer_reset_incoming_commands(&channel->incomingUnreliableCommands);
  2616. }
  2617. enet_free(peer->channels);
  2618. }
  2619. peer->channels = NULL;
  2620. peer->channelCount = 0;
  2621. }
  2622. void enet_peer_on_connect(ENetPeer* peer) {
  2623. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  2624. if (peer->incomingBandwidth != 0)
  2625. ++peer->host->bandwidthLimitedPeers;
  2626. ++peer->host->connectedPeers;
  2627. }
  2628. }
  2629. void enet_peer_on_disconnect(ENetPeer* peer) {
  2630. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2631. if (peer->incomingBandwidth != 0)
  2632. --peer->host->bandwidthLimitedPeers;
  2633. --peer->host->connectedPeers;
  2634. }
  2635. }
  2636. void enet_peer_reset(ENetPeer* peer) {
  2637. enet_peer_on_disconnect(peer);
  2638. peer->outgoingPeerID = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  2639. peer->state = ENET_PEER_STATE_DISCONNECTED;
  2640. peer->incomingBandwidth = 0;
  2641. peer->outgoingBandwidth = 0;
  2642. peer->incomingBandwidthThrottleEpoch = 0;
  2643. peer->outgoingBandwidthThrottleEpoch = 0;
  2644. peer->incomingDataTotal = 0;
  2645. peer->totalDataReceived = 0;
  2646. peer->outgoingDataTotal = 0;
  2647. peer->totalDataSent = 0;
  2648. peer->lastSendTime = 0;
  2649. peer->lastReceiveTime = 0;
  2650. peer->nextTimeout = 0;
  2651. peer->earliestTimeout = 0;
  2652. peer->packetLossEpoch = 0;
  2653. peer->packetsSent = 0;
  2654. peer->totalPacketsSent = 0;
  2655. peer->packetsLost = 0;
  2656. peer->totalPacketsLost = 0;
  2657. peer->packetLoss = 0;
  2658. peer->packetLossVariance = 0;
  2659. peer->packetThrottle = ENET_PEER_DEFAULT_PACKET_THROTTLE;
  2660. peer->packetThrottleLimit = ENET_PEER_PACKET_THROTTLE_SCALE;
  2661. peer->packetThrottleCounter = 0;
  2662. peer->packetThrottleEpoch = 0;
  2663. peer->packetThrottleAcceleration = ENET_PEER_PACKET_THROTTLE_ACCELERATION;
  2664. peer->packetThrottleDeceleration = ENET_PEER_PACKET_THROTTLE_DECELERATION;
  2665. peer->packetThrottleInterval = ENET_PEER_PACKET_THROTTLE_INTERVAL;
  2666. peer->pingInterval = ENET_PEER_PING_INTERVAL;
  2667. peer->timeoutLimit = ENET_PEER_TIMEOUT_LIMIT;
  2668. peer->timeoutMinimum = ENET_PEER_TIMEOUT_MINIMUM;
  2669. peer->timeoutMaximum = ENET_PEER_TIMEOUT_MAXIMUM;
  2670. peer->smoothedRoundTripTime = 0;
  2671. peer->lastRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2672. peer->lowestRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2673. peer->lastRoundTripTimeVariance = 0;
  2674. peer->highestRoundTripTimeVariance = 0;
  2675. peer->roundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2676. peer->roundTripTimeVariance = 0;
  2677. peer->mtu = peer->host->mtu;
  2678. peer->reliableDataInTransit = 0;
  2679. peer->outgoingReliableSequenceNumber = 0;
  2680. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  2681. peer->incomingUnsequencedGroup = 0;
  2682. peer->outgoingUnsequencedGroup = 0;
  2683. peer->eventData = 0;
  2684. peer->totalWaitingData = 0;
  2685. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  2686. enet_peer_reset_queues(peer);
  2687. }
  2688. void enet_peer_ping(ENetPeer* peer) {
  2689. ENetProtocol command;
  2690. if (peer->state != ENET_PEER_STATE_CONNECTED)
  2691. return;
  2692. command.header.command = ENET_PROTOCOL_COMMAND_PING | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2693. command.header.channelID = 0xFF;
  2694. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2695. }
  2696. void enet_peer_ping_interval(ENetPeer* peer, enet_uint32 pingInterval) {
  2697. peer->pingInterval = pingInterval ? pingInterval : ENET_PEER_PING_INTERVAL;
  2698. }
  2699. void enet_peer_timeout(ENetPeer* peer, enet_uint32 timeoutLimit, enet_uint32 timeoutMinimum, enet_uint32 timeoutMaximum) {
  2700. peer->timeoutLimit = timeoutLimit ? timeoutLimit : ENET_PEER_TIMEOUT_LIMIT;
  2701. peer->timeoutMinimum = timeoutMinimum ? timeoutMinimum : ENET_PEER_TIMEOUT_MINIMUM;
  2702. peer->timeoutMaximum = timeoutMaximum ? timeoutMaximum : ENET_PEER_TIMEOUT_MAXIMUM;
  2703. }
  2704. void enet_peer_disconnect_now(ENetPeer* peer, enet_uint32 data) {
  2705. ENetProtocol command;
  2706. if (peer->state == ENET_PEER_STATE_DISCONNECTED)
  2707. return;
  2708. if (peer->state != ENET_PEER_STATE_ZOMBIE && peer->state != ENET_PEER_STATE_DISCONNECTING) {
  2709. enet_peer_reset_queues(peer);
  2710. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2711. command.header.channelID = 0xFF;
  2712. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2713. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2714. enet_host_flush(peer->host);
  2715. }
  2716. enet_peer_reset(peer);
  2717. }
  2718. void enet_peer_disconnect(ENetPeer* peer, enet_uint32 data) {
  2719. ENetProtocol command;
  2720. 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)
  2721. return;
  2722. enet_peer_reset_queues(peer);
  2723. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT;
  2724. command.header.channelID = 0xFF;
  2725. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2726. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2727. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2728. else
  2729. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2730. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2731. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2732. enet_peer_on_disconnect(peer);
  2733. peer->state = ENET_PEER_STATE_DISCONNECTING;
  2734. } else {
  2735. enet_host_flush(peer->host);
  2736. enet_peer_reset(peer);
  2737. }
  2738. }
  2739. void enet_peer_disconnect_later(ENetPeer* peer, enet_uint32 data) {
  2740. if ((peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) && !(enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))) {
  2741. peer->state = ENET_PEER_STATE_DISCONNECT_LATER;
  2742. peer->eventData = data;
  2743. } else {
  2744. enet_peer_disconnect(peer, data);
  2745. }
  2746. }
  2747. ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer* peer, const ENetProtocol* command, enet_uint16 sentTime) {
  2748. ENetAcknowledgement* acknowledgement;
  2749. if (command->header.channelID < peer->channelCount) {
  2750. ENetChannel* channel = &peer->channels[command->header.channelID];
  2751. enet_uint16 reliableWindow = command->header.reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2752. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2753. if (command->header.reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2754. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2755. if (reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1 && reliableWindow <= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS)
  2756. return NULL;
  2757. }
  2758. acknowledgement = (ENetAcknowledgement*)enet_malloc(sizeof(ENetAcknowledgement));
  2759. if (acknowledgement == NULL)
  2760. return NULL;
  2761. peer->outgoingDataTotal += sizeof(ENetProtocolAcknowledge);
  2762. acknowledgement->sentTime = sentTime;
  2763. acknowledgement->command = *command;
  2764. enet_list_insert(enet_list_end(&peer->acknowledgements), acknowledgement);
  2765. return acknowledgement;
  2766. }
  2767. void enet_peer_setup_outgoing_command(ENetPeer* peer, ENetOutgoingCommand* outgoingCommand) {
  2768. ENetChannel* channel = &peer->channels[outgoingCommand->command.header.channelID];
  2769. peer->outgoingDataTotal += enet_protocol_command_size(outgoingCommand->command.header.command) + outgoingCommand->fragmentLength;
  2770. if (outgoingCommand->command.header.channelID == 0xFF) {
  2771. ++peer->outgoingReliableSequenceNumber;
  2772. outgoingCommand->reliableSequenceNumber = peer->outgoingReliableSequenceNumber;
  2773. outgoingCommand->unreliableSequenceNumber = 0;
  2774. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2775. ++channel->outgoingReliableSequenceNumber;
  2776. channel->outgoingUnreliableSequenceNumber = 0;
  2777. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2778. outgoingCommand->unreliableSequenceNumber = 0;
  2779. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED) {
  2780. ++peer->outgoingUnsequencedGroup;
  2781. outgoingCommand->reliableSequenceNumber = 0;
  2782. outgoingCommand->unreliableSequenceNumber = 0;
  2783. } else {
  2784. if (outgoingCommand->fragmentOffset == 0)
  2785. ++channel->outgoingUnreliableSequenceNumber;
  2786. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2787. outgoingCommand->unreliableSequenceNumber = channel->outgoingUnreliableSequenceNumber;
  2788. }
  2789. outgoingCommand->sendAttempts = 0;
  2790. outgoingCommand->sentTime = 0;
  2791. outgoingCommand->roundTripTimeout = 0;
  2792. outgoingCommand->roundTripTimeoutLimit = 0;
  2793. outgoingCommand->command.header.reliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->reliableSequenceNumber);
  2794. switch (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2795. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2796. outgoingCommand->command.sendUnreliable.unreliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->unreliableSequenceNumber);
  2797. break;
  2798. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2799. outgoingCommand->command.sendUnsequenced.unsequencedGroup = ENET_HOST_TO_NET_16(peer->outgoingUnsequencedGroup);
  2800. break;
  2801. default:
  2802. break;
  2803. }
  2804. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)
  2805. enet_list_insert(enet_list_end(&peer->outgoingReliableCommands), outgoingCommand);
  2806. else
  2807. enet_list_insert(enet_list_end(&peer->outgoingUnreliableCommands), outgoingCommand);
  2808. }
  2809. ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer* peer, const ENetProtocol* command, ENetPacket* packet, enet_uint32 offset, enet_uint16 length) {
  2810. ENetOutgoingCommand* outgoingCommand = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2811. if (outgoingCommand == NULL)
  2812. return NULL;
  2813. outgoingCommand->command = *command;
  2814. outgoingCommand->fragmentOffset = offset;
  2815. outgoingCommand->fragmentLength = length;
  2816. outgoingCommand->packet = packet;
  2817. if (packet != NULL)
  2818. ++packet->referenceCount;
  2819. enet_peer_setup_outgoing_command(peer, outgoingCommand);
  2820. return outgoingCommand;
  2821. }
  2822. void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2823. ENetListIterator droppedCommand, startCommand, currentCommand;
  2824. for (droppedCommand = startCommand = currentCommand = enet_list_begin(&channel->incomingUnreliableCommands); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2825. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2826. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2827. continue;
  2828. if (incomingCommand->reliableSequenceNumber == channel->incomingReliableSequenceNumber) {
  2829. if (incomingCommand->fragmentsRemaining <= 0) {
  2830. channel->incomingUnreliableSequenceNumber = incomingCommand->unreliableSequenceNumber;
  2831. continue;
  2832. }
  2833. if (startCommand != currentCommand) {
  2834. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2835. if (!peer->needsDispatch) {
  2836. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2837. peer->needsDispatch = 1;
  2838. }
  2839. droppedCommand = currentCommand;
  2840. } else if (droppedCommand != currentCommand)
  2841. droppedCommand = enet_list_previous(currentCommand);
  2842. } else {
  2843. enet_uint16 reliableWindow = incomingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2844. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2845. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2846. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2847. if (reliableWindow >= currentWindow && reliableWindow < currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2848. break;
  2849. droppedCommand = enet_list_next(currentCommand);
  2850. if (startCommand != currentCommand) {
  2851. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2852. if (!peer->needsDispatch) {
  2853. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2854. peer->needsDispatch = 1;
  2855. }
  2856. }
  2857. }
  2858. startCommand = enet_list_next(currentCommand);
  2859. }
  2860. if (startCommand != currentCommand) {
  2861. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, 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. droppedCommand = currentCommand;
  2867. }
  2868. enet_peer_remove_incoming_commands(&channel->incomingUnreliableCommands, enet_list_begin(&channel->incomingUnreliableCommands), droppedCommand);
  2869. }
  2870. void enet_peer_dispatch_incoming_reliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2871. ENetListIterator currentCommand;
  2872. for (currentCommand = enet_list_begin(&channel->incomingReliableCommands); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2873. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2874. if (incomingCommand->fragmentsRemaining > 0 || incomingCommand->reliableSequenceNumber != (enet_uint16)(channel->incomingReliableSequenceNumber + 1))
  2875. break;
  2876. channel->incomingReliableSequenceNumber = incomingCommand->reliableSequenceNumber;
  2877. if (incomingCommand->fragmentCount > 0)
  2878. channel->incomingReliableSequenceNumber += incomingCommand->fragmentCount - 1;
  2879. }
  2880. if (currentCommand == enet_list_begin(&channel->incomingReliableCommands))
  2881. return;
  2882. channel->incomingUnreliableSequenceNumber = 0;
  2883. enet_list_move(enet_list_end(&peer->dispatchedCommands), enet_list_begin(&channel->incomingReliableCommands), enet_list_previous(currentCommand));
  2884. if (!peer->needsDispatch) {
  2885. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2886. peer->needsDispatch = 1;
  2887. }
  2888. if (!enet_list_empty(&channel->incomingUnreliableCommands))
  2889. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2890. }
  2891. ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer* peer, const ENetProtocol* command, const void* data, size_t dataLength, enet_uint32 flags, enet_uint32 fragmentCount) {
  2892. static ENetIncomingCommand dummyCommand;
  2893. ENetChannel* channel = &peer->channels[command->header.channelID];
  2894. enet_uint32 unreliableSequenceNumber = 0, reliableSequenceNumber = 0;
  2895. enet_uint16 reliableWindow, currentWindow;
  2896. ENetIncomingCommand* incomingCommand;
  2897. ENetListIterator currentCommand;
  2898. ENetPacket* packet = NULL;
  2899. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2900. goto discardCommand;
  2901. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) {
  2902. reliableSequenceNumber = command->header.reliableSequenceNumber;
  2903. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2904. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2905. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2906. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2907. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2908. goto discardCommand;
  2909. }
  2910. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2911. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2912. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2913. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber)
  2914. goto discardCommand;
  2915. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2916. incomingCommand = (ENetIncomingCommand*)currentCommand;
  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. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2925. break;
  2926. goto discardCommand;
  2927. }
  2928. }
  2929. break;
  2930. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2931. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  2932. unreliableSequenceNumber = ENET_NET_TO_HOST_16(command->sendUnreliable.unreliableSequenceNumber);
  2933. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && unreliableSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  2934. goto discardCommand;
  2935. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2936. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2937. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2938. continue;
  2939. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2940. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2941. continue;
  2942. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2943. break;
  2944. }
  2945. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2946. break;
  2947. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  2948. continue;
  2949. if (incomingCommand->unreliableSequenceNumber <= unreliableSequenceNumber) {
  2950. if (incomingCommand->unreliableSequenceNumber < unreliableSequenceNumber)
  2951. break;
  2952. goto discardCommand;
  2953. }
  2954. }
  2955. break;
  2956. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2957. currentCommand = enet_list_end(&channel->incomingUnreliableCommands);
  2958. break;
  2959. default:
  2960. goto discardCommand;
  2961. }
  2962. if (peer->totalWaitingData >= peer->host->maximumWaitingData)
  2963. goto notifyError;
  2964. packet = enet_packet_create(data, dataLength, flags);
  2965. if (packet == NULL)
  2966. goto notifyError;
  2967. incomingCommand = (ENetIncomingCommand*)enet_malloc(sizeof(ENetIncomingCommand));
  2968. if (incomingCommand == NULL)
  2969. goto notifyError;
  2970. incomingCommand->reliableSequenceNumber = command->header.reliableSequenceNumber;
  2971. incomingCommand->unreliableSequenceNumber = unreliableSequenceNumber & 0xFFFF;
  2972. incomingCommand->command = *command;
  2973. incomingCommand->fragmentCount = fragmentCount;
  2974. incomingCommand->fragmentsRemaining = fragmentCount;
  2975. incomingCommand->packet = packet;
  2976. incomingCommand->fragments = NULL;
  2977. if (fragmentCount > 0) {
  2978. if (fragmentCount <= ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2979. incomingCommand->fragments = (enet_uint32*)enet_malloc((fragmentCount + 31) / 32 * sizeof(enet_uint32));
  2980. if (incomingCommand->fragments == NULL) {
  2981. enet_free(incomingCommand);
  2982. goto notifyError;
  2983. }
  2984. memset(incomingCommand->fragments, 0, (fragmentCount + 31) / 32 * sizeof(enet_uint32));
  2985. }
  2986. if (packet != NULL) {
  2987. ++packet->referenceCount;
  2988. peer->totalWaitingData += packet->dataLength;
  2989. }
  2990. enet_list_insert(enet_list_next(currentCommand), incomingCommand);
  2991. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2992. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2993. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2994. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  2995. break;
  2996. default:
  2997. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2998. break;
  2999. }
  3000. return incomingCommand;
  3001. discardCommand:
  3002. if (fragmentCount > 0)
  3003. goto notifyError;
  3004. if (packet != NULL && packet->referenceCount == 0)
  3005. enet_packet_destroy(packet);
  3006. return &dummyCommand;
  3007. notifyError:
  3008. if (packet != NULL && packet->referenceCount == 0)
  3009. enet_packet_destroy(packet);
  3010. return NULL;
  3011. }
  3012. /*
  3013. =======================================================================
  3014. Host
  3015. =======================================================================
  3016. */
  3017. ENetHost* enet_host_create(const ENetAddress* address, size_t peerCount, size_t channelLimit, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth, int bufferSize) {
  3018. ENetHost* host;
  3019. ENetPeer* currentPeer;
  3020. if (peerCount > ENET_PROTOCOL_MAXIMUM_PEER_ID)
  3021. return NULL;
  3022. host = (ENetHost*)enet_malloc(sizeof(ENetHost));
  3023. if (host == NULL)
  3024. return NULL;
  3025. memset(host, 0, sizeof(ENetHost));
  3026. host->peers = (ENetPeer*)enet_malloc(peerCount * sizeof(ENetPeer));
  3027. if (host->peers == NULL) {
  3028. enet_free(host);
  3029. return NULL;
  3030. }
  3031. memset(host->peers, 0, peerCount * sizeof(ENetPeer));
  3032. host->socket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
  3033. if (host->socket != ENET_SOCKET_NULL)
  3034. enet_socket_set_option(host->socket, ENET_SOCKOPT_IPV6_V6ONLY, 0);
  3035. if (host->socket == ENET_SOCKET_NULL || (address != NULL && enet_socket_bind(host->socket, address) < 0)) {
  3036. if (host->socket != ENET_SOCKET_NULL)
  3037. enet_socket_destroy(host->socket);
  3038. enet_free(host->peers);
  3039. enet_free(host);
  3040. return NULL;
  3041. }
  3042. if (bufferSize > ENET_HOST_BUFFER_SIZE_MAX)
  3043. bufferSize = ENET_HOST_BUFFER_SIZE_MAX;
  3044. else if (bufferSize < ENET_HOST_BUFFER_SIZE_MIN)
  3045. bufferSize = ENET_HOST_BUFFER_SIZE_MIN;
  3046. enet_socket_set_option(host->socket, ENET_SOCKOPT_NONBLOCK, 1);
  3047. enet_socket_set_option(host->socket, ENET_SOCKOPT_BROADCAST, 1);
  3048. enet_socket_set_option(host->socket, ENET_SOCKOPT_RCVBUF, bufferSize);
  3049. enet_socket_set_option(host->socket, ENET_SOCKOPT_SNDBUF, bufferSize);
  3050. if (address != NULL && enet_socket_get_address(host->socket, &host->address) < 0)
  3051. host->address = *address;
  3052. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3053. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3054. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3055. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3056. host->randomSeed = (enet_uint32)(size_t)host;
  3057. host->randomSeed += enet_host_random_seed();
  3058. host->randomSeed = (host->randomSeed << 16) | (host->randomSeed >> 16);
  3059. host->channelLimit = channelLimit;
  3060. host->incomingBandwidth = incomingBandwidth;
  3061. host->outgoingBandwidth = outgoingBandwidth;
  3062. host->bandwidthThrottleEpoch = 0;
  3063. host->recalculateBandwidthLimits = 0;
  3064. host->preventConnections = 0;
  3065. host->mtu = ENET_HOST_DEFAULT_MTU;
  3066. host->peerCount = peerCount;
  3067. host->commandCount = 0;
  3068. host->bufferCount = 0;
  3069. host->compression = 0;
  3070. host->compressionBufferSize = 0;
  3071. host->checksumCallback = NULL;
  3072. host->receivedAddress.ipv6 = ENET_HOST_ANY;
  3073. host->receivedAddress.port = 0;
  3074. host->receivedData = NULL;
  3075. host->receivedDataLength = 0;
  3076. host->totalSentData = 0;
  3077. host->totalSentPackets = 0;
  3078. host->totalReceivedData = 0;
  3079. host->totalReceivedPackets = 0;
  3080. host->connectedPeers = 0;
  3081. host->bandwidthLimitedPeers = 0;
  3082. host->duplicatePeers = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  3083. host->maximumPacketSize = ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE;
  3084. host->maximumWaitingData = ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA;
  3085. host->interceptCallback = NULL;
  3086. enet_list_clear(&host->dispatchQueue);
  3087. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3088. currentPeer->host = host;
  3089. currentPeer->incomingPeerID = currentPeer - host->peers;
  3090. currentPeer->outgoingSessionID = currentPeer->incomingSessionID = 0xFF;
  3091. currentPeer->data = NULL;
  3092. enet_list_clear(&currentPeer->acknowledgements);
  3093. enet_list_clear(&currentPeer->sentReliableCommands);
  3094. enet_list_clear(&currentPeer->sentUnreliableCommands);
  3095. enet_list_clear(&currentPeer->outgoingReliableCommands);
  3096. enet_list_clear(&currentPeer->outgoingUnreliableCommands);
  3097. enet_list_clear(&currentPeer->dispatchedCommands);
  3098. enet_peer_reset(currentPeer);
  3099. }
  3100. ENET_LOG_TRACE("host created successfully\n");
  3101. return host;
  3102. }
  3103. void enet_host_destroy(ENetHost* host) {
  3104. ENetPeer* currentPeer;
  3105. if (host == NULL)
  3106. return;
  3107. enet_socket_destroy(host->socket);
  3108. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3109. enet_peer_reset(currentPeer);
  3110. }
  3111. enet_free(host->peers);
  3112. enet_free(host->compressionBuffer);
  3113. enet_free(host);
  3114. }
  3115. void enet_host_enable_compression(ENetHost* host) {
  3116. if (host == NULL)
  3117. return;
  3118. host->compression = 1;
  3119. }
  3120. void enet_host_prevent_connections(ENetHost* host, enet_uint8 state) {
  3121. if (host == NULL)
  3122. return;
  3123. host->preventConnections = state;
  3124. }
  3125. ENetPeer* enet_host_connect(ENetHost* host, const ENetAddress* address, size_t channelCount, enet_uint32 data) {
  3126. ENetPeer* currentPeer;
  3127. ENetChannel* channel;
  3128. ENetProtocol command;
  3129. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3130. channelCount = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3131. else if (channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3132. channelCount = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3133. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3134. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED)
  3135. break;
  3136. }
  3137. if (currentPeer >= &host->peers[host->peerCount])
  3138. return NULL;
  3139. currentPeer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  3140. if (currentPeer->channels == NULL)
  3141. return NULL;
  3142. currentPeer->channelCount = channelCount;
  3143. currentPeer->state = ENET_PEER_STATE_CONNECTING;
  3144. currentPeer->address = *address;
  3145. currentPeer->connectID = ++host->randomSeed;
  3146. if (host->outgoingBandwidth == 0)
  3147. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3148. else
  3149. currentPeer->windowSize = (host->outgoingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3150. if (currentPeer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  3151. currentPeer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3152. else if (currentPeer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  3153. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3154. for (channel = currentPeer->channels; channel < &currentPeer->channels[channelCount]; ++channel) {
  3155. channel->outgoingReliableSequenceNumber = 0;
  3156. channel->outgoingUnreliableSequenceNumber = 0;
  3157. channel->incomingReliableSequenceNumber = 0;
  3158. channel->incomingUnreliableSequenceNumber = 0;
  3159. enet_list_clear(&channel->incomingReliableCommands);
  3160. enet_list_clear(&channel->incomingUnreliableCommands);
  3161. channel->usedReliableWindows = 0;
  3162. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  3163. }
  3164. command.header.command = ENET_PROTOCOL_COMMAND_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3165. command.header.channelID = 0xFF;
  3166. command.connect.outgoingPeerID = ENET_HOST_TO_NET_16(currentPeer->incomingPeerID);
  3167. command.connect.incomingSessionID = currentPeer->incomingSessionID;
  3168. command.connect.outgoingSessionID = currentPeer->outgoingSessionID;
  3169. command.connect.mtu = ENET_HOST_TO_NET_32(currentPeer->mtu);
  3170. command.connect.windowSize = ENET_HOST_TO_NET_32(currentPeer->windowSize);
  3171. command.connect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  3172. command.connect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  3173. command.connect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3174. command.connect.packetThrottleInterval = ENET_HOST_TO_NET_32(currentPeer->packetThrottleInterval);
  3175. command.connect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleAcceleration);
  3176. command.connect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleDeceleration);
  3177. command.connect.connectID = currentPeer->connectID;
  3178. command.connect.data = ENET_HOST_TO_NET_32(data);
  3179. enet_peer_queue_outgoing_command(currentPeer, &command, NULL, 0, 0);
  3180. return currentPeer;
  3181. }
  3182. void enet_host_broadcast(ENetHost* host, enet_uint8 channelID, ENetPacket* packet) {
  3183. ENetPeer* currentPeer;
  3184. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3185. ++packet->referenceCount;
  3186. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3187. if (currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3188. continue;
  3189. enet_peer_send(currentPeer, channelID, packet);
  3190. }
  3191. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3192. --packet->referenceCount;
  3193. if (packet->referenceCount == 0)
  3194. enet_packet_destroy(packet);
  3195. }
  3196. void enet_host_broadcast_exclude(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer* excludedPeer) {
  3197. ENetPeer* currentPeer;
  3198. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3199. ++packet->referenceCount;
  3200. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3201. if (currentPeer->state != ENET_PEER_STATE_CONNECTED || currentPeer == excludedPeer)
  3202. continue;
  3203. enet_peer_send(currentPeer, channelID, packet);
  3204. }
  3205. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3206. --packet->referenceCount;
  3207. if (packet->referenceCount == 0)
  3208. enet_packet_destroy(packet);
  3209. }
  3210. void enet_host_broadcast_selective(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer** peers, size_t length) {
  3211. ENetPeer* currentPeer;
  3212. size_t i;
  3213. if (host == NULL)
  3214. return;
  3215. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3216. ++packet->referenceCount;
  3217. for (i = 0; i < length; i++) {
  3218. currentPeer = peers[i];
  3219. if (currentPeer == NULL || currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3220. continue;
  3221. enet_peer_send(currentPeer, channelID, packet);
  3222. }
  3223. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3224. --packet->referenceCount;
  3225. if (packet->referenceCount == 0)
  3226. enet_packet_destroy(packet);
  3227. }
  3228. void enet_host_channel_limit(ENetHost* host, size_t channelLimit) {
  3229. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3230. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3231. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3232. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3233. host->channelLimit = channelLimit;
  3234. }
  3235. void enet_host_bandwidth_limit(ENetHost* host, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth) {
  3236. host->incomingBandwidth = incomingBandwidth;
  3237. host->outgoingBandwidth = outgoingBandwidth;
  3238. host->recalculateBandwidthLimits = 1;
  3239. }
  3240. void enet_host_bandwidth_throttle(ENetHost* host) {
  3241. enet_uint32 timeCurrent = enet_time_get();
  3242. enet_uint32 elapsedTime = timeCurrent - host->bandwidthThrottleEpoch;
  3243. enet_uint32 peersRemaining = (enet_uint32)host->connectedPeers;
  3244. enet_uint32 dataTotal = ~0;
  3245. enet_uint32 bandwidth = ~0;
  3246. enet_uint32 throttle = 0;
  3247. enet_uint32 bandwidthLimit = 0;
  3248. int needsAdjustment = host->bandwidthLimitedPeers > 0 ? 1 : 0;
  3249. ENetPeer* peer;
  3250. ENetProtocol command;
  3251. if (elapsedTime < ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  3252. return;
  3253. if (host->outgoingBandwidth == 0 && host->incomingBandwidth == 0)
  3254. return;
  3255. host->bandwidthThrottleEpoch = timeCurrent;
  3256. if (peersRemaining == 0)
  3257. return;
  3258. if (host->outgoingBandwidth != 0) {
  3259. dataTotal = 0;
  3260. bandwidth = (host->outgoingBandwidth * elapsedTime) / 1000;
  3261. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3262. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3263. continue;
  3264. dataTotal += peer->outgoingDataTotal;
  3265. }
  3266. }
  3267. while (peersRemaining > 0 && needsAdjustment != 0) {
  3268. needsAdjustment = 0;
  3269. if (dataTotal <= bandwidth)
  3270. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3271. else
  3272. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3273. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3274. enet_uint32 peerBandwidth;
  3275. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidth == 0 || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3276. continue;
  3277. peerBandwidth = (peer->incomingBandwidth * elapsedTime) / 1000;
  3278. if ((throttle * peer->outgoingDataTotal) / ENET_PEER_PACKET_THROTTLE_SCALE <= peerBandwidth)
  3279. continue;
  3280. peer->packetThrottleLimit = (peerBandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / peer->outgoingDataTotal;
  3281. if (peer->packetThrottleLimit == 0)
  3282. peer->packetThrottleLimit = 1;
  3283. if (peer->packetThrottle > peer->packetThrottleLimit)
  3284. peer->packetThrottle = peer->packetThrottleLimit;
  3285. peer->outgoingBandwidthThrottleEpoch = timeCurrent;
  3286. peer->incomingDataTotal = 0;
  3287. peer->outgoingDataTotal = 0;
  3288. needsAdjustment = 1;
  3289. --peersRemaining;
  3290. bandwidth -= peerBandwidth;
  3291. dataTotal -= peerBandwidth;
  3292. }
  3293. }
  3294. if (peersRemaining > 0) {
  3295. if (dataTotal <= bandwidth)
  3296. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3297. else
  3298. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3299. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3300. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3301. continue;
  3302. peer->packetThrottleLimit = throttle;
  3303. if (peer->packetThrottle > peer->packetThrottleLimit)
  3304. peer->packetThrottle = peer->packetThrottleLimit;
  3305. peer->incomingDataTotal = 0;
  3306. peer->outgoingDataTotal = 0;
  3307. }
  3308. }
  3309. if (host->recalculateBandwidthLimits) {
  3310. host->recalculateBandwidthLimits = 0;
  3311. peersRemaining = (enet_uint32)host->connectedPeers;
  3312. bandwidth = host->incomingBandwidth;
  3313. needsAdjustment = 1;
  3314. if (bandwidth == 0) {
  3315. bandwidthLimit = 0;
  3316. } else {
  3317. while (peersRemaining > 0 && needsAdjustment != 0) {
  3318. needsAdjustment = 0;
  3319. bandwidthLimit = bandwidth / peersRemaining;
  3320. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3321. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3322. continue;
  3323. if (peer->outgoingBandwidth > 0 && peer->outgoingBandwidth >= bandwidthLimit)
  3324. continue;
  3325. peer->incomingBandwidthThrottleEpoch = timeCurrent;
  3326. needsAdjustment = 1;
  3327. --peersRemaining;
  3328. bandwidth -= peer->outgoingBandwidth;
  3329. }
  3330. }
  3331. }
  3332. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3333. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3334. continue;
  3335. command.header.command = ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3336. command.header.channelID = 0xFF;
  3337. command.bandwidthLimit.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3338. if (peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3339. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(peer->outgoingBandwidth);
  3340. else
  3341. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(bandwidthLimit);
  3342. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  3343. }
  3344. }
  3345. }
  3346. /*
  3347. =======================================================================
  3348. Address
  3349. =======================================================================
  3350. */
  3351. int enet_address_set_host_ip(ENetAddress* address, const char* ip) {
  3352. int type = AF_INET6;
  3353. void* destination = &address->ipv6;
  3354. if (strchr(ip, ':') == NULL) {
  3355. type = AF_INET;
  3356. address->ipv4.ffff = 0xFFFF;
  3357. destination = &address->ipv4.ip;
  3358. }
  3359. if (!inet_pton(type, ip, destination))
  3360. return -1;
  3361. return 0;
  3362. }
  3363. int enet_address_set_host(ENetAddress* address, const char* name) {
  3364. struct addrinfo hints, *resultList = NULL, *result = NULL;
  3365. memset(&hints, 0, sizeof(hints));
  3366. hints.ai_family = AF_UNSPEC;
  3367. if (getaddrinfo(name, NULL, &hints, &resultList) != 0)
  3368. return -1;
  3369. for (result = resultList; result != NULL; result = result->ai_next) {
  3370. if (result->ai_addr != NULL && result->ai_addrlen >= sizeof(struct sockaddr_in)) {
  3371. if (result->ai_family == AF_INET) {
  3372. struct sockaddr_in* sin = (struct sockaddr_in*)result->ai_addr;
  3373. memset(address, 0, sizeof(address->ipv4.zeros));
  3374. address->ipv4.ffff = 0xFFFF;
  3375. address->ipv4.ip.s_addr = sin->sin_addr.s_addr;
  3376. freeaddrinfo(resultList);
  3377. return 0;
  3378. } else if (result->ai_family == AF_INET6) {
  3379. struct sockaddr_in6* sin = (struct sockaddr_in6*)result->ai_addr;
  3380. address->ipv6 = sin->sin6_addr;
  3381. freeaddrinfo(resultList);
  3382. return 0;
  3383. }
  3384. }
  3385. }
  3386. if (resultList != NULL)
  3387. freeaddrinfo(resultList);
  3388. return enet_address_set_host_ip(address, name);
  3389. }
  3390. int enet_address_get_host_ip(const ENetAddress* address, char* ip, size_t ipLength) {
  3391. if (inet_ntop(AF_INET6, &address->ipv6, ip, ipLength) == NULL)
  3392. return -1;
  3393. if (enet_array_is_zeroed(address->ipv4.zeros, sizeof(address->ipv4.zeros)) == 0 && address->ipv4.ffff == 0xFFFF)
  3394. enet_string_copy(ip, ip + 7, ipLength);
  3395. return 0;
  3396. }
  3397. int enet_address_get_host(const ENetAddress* address, char* name, size_t nameLength) {
  3398. struct sockaddr_in6 sin;
  3399. int err;
  3400. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3401. sin.sin6_family = AF_INET6;
  3402. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3403. sin.sin6_addr = address->ipv6;
  3404. err = getnameinfo((struct sockaddr*)&sin, sizeof(sin), name, nameLength, NULL, 0, NI_NAMEREQD);
  3405. if (!err) {
  3406. if (name != NULL && nameLength > 0 && !memchr(name, '\0', nameLength))
  3407. return -1;
  3408. return 0;
  3409. }
  3410. if (err != EAI_NONAME)
  3411. return -1;
  3412. return enet_address_get_host_ip(address, name, nameLength);
  3413. }
  3414. /*
  3415. =======================================================================
  3416. Platform-specific (Unix)
  3417. =======================================================================
  3418. */
  3419. #ifndef _WIN32
  3420. int enet_initialize(void) {
  3421. return 0;
  3422. }
  3423. void enet_deinitialize(void) { }
  3424. enet_uint64 enet_host_random_seed(void) {
  3425. struct timeval timeVal;
  3426. gettimeofday(&timeVal, NULL);
  3427. return (timeVal.tv_sec * 1000) ^ (timeVal.tv_usec / 1000);
  3428. }
  3429. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3430. struct sockaddr_in6 sin;
  3431. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3432. sin.sin6_family = AF_INET6;
  3433. if (address != NULL) {
  3434. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3435. sin.sin6_addr = address->ipv6;
  3436. } else {
  3437. sin.sin6_port = 0;
  3438. sin.sin6_addr = ENET_HOST_ANY;
  3439. }
  3440. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3441. }
  3442. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3443. struct sockaddr_in6 sin;
  3444. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3445. if (getsockname(socket, (struct sockaddr*)&sin, &sinLength) == -1)
  3446. return -1;
  3447. address->ipv6 = sin.sin6_addr;
  3448. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3449. return 0;
  3450. }
  3451. int enet_socket_listen(ENetSocket socket, int backlog) {
  3452. return listen(socket, backlog < 0 ? SOMAXCONN : backlog);
  3453. }
  3454. ENetSocket enet_socket_create(ENetSocketType type) {
  3455. int socketType = (type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM);
  3456. #ifdef SOCK_CLOEXEC
  3457. socketType |= SOCK_CLOEXEC;
  3458. #endif
  3459. return socket(PF_INET6, socketType, 0);
  3460. }
  3461. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3462. int result = -1;
  3463. switch (option) {
  3464. case ENET_SOCKOPT_NONBLOCK:
  3465. result = fcntl(socket, F_SETFL, (value ? O_NONBLOCK : 0) | (fcntl(socket, F_GETFL) & ~O_NONBLOCK));
  3466. break;
  3467. case ENET_SOCKOPT_BROADCAST:
  3468. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3469. break;
  3470. case ENET_SOCKOPT_REUSEADDR:
  3471. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3472. break;
  3473. case ENET_SOCKOPT_RCVBUF:
  3474. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3475. break;
  3476. case ENET_SOCKOPT_SNDBUF:
  3477. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3478. break;
  3479. case ENET_SOCKOPT_RCVTIMEO: {
  3480. struct timeval timeVal;
  3481. timeVal.tv_sec = value / 1000;
  3482. timeVal.tv_usec = (value % 1000) * 1000;
  3483. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3484. break;
  3485. }
  3486. case ENET_SOCKOPT_SNDTIMEO: {
  3487. struct timeval timeVal;
  3488. timeVal.tv_sec = value / 1000;
  3489. timeVal.tv_usec = (value % 1000) * 1000;
  3490. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3491. break;
  3492. }
  3493. case ENET_SOCKOPT_NODELAY:
  3494. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3495. break;
  3496. case ENET_SOCKOPT_IPV6_V6ONLY:
  3497. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3498. break;
  3499. default:
  3500. break;
  3501. }
  3502. return result == -1 ? -1 : 0;
  3503. }
  3504. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3505. int result = -1;
  3506. socklen_t len;
  3507. switch (option) {
  3508. case ENET_SOCKOPT_ERROR:
  3509. len = sizeof(int);
  3510. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, value, &len);
  3511. break;
  3512. default:
  3513. break;
  3514. }
  3515. return result == -1 ? -1 : 0;
  3516. }
  3517. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3518. int result = -1;
  3519. struct sockaddr_in6 sin;
  3520. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3521. sin.sin6_family = AF_INET6;
  3522. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3523. sin.sin6_addr = address->ipv6;
  3524. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3525. if (result == -1 && errno == EINPROGRESS)
  3526. return 0;
  3527. return result;
  3528. }
  3529. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3530. int result = -1;
  3531. struct sockaddr_in6 sin;
  3532. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3533. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3534. if (result == -1)
  3535. return ENET_SOCKET_NULL;
  3536. if (address != NULL) {
  3537. address->ipv6 = sin.sin6_addr;
  3538. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3539. }
  3540. return result;
  3541. }
  3542. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3543. return shutdown(socket, (int)how);
  3544. }
  3545. void enet_socket_destroy(ENetSocket socket) {
  3546. if (socket != ENET_SOCKET_NULL)
  3547. close(socket);
  3548. }
  3549. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3550. struct msghdr msgHdr;
  3551. struct sockaddr_in6 sin;
  3552. int sentLength;
  3553. memset(&msgHdr, 0, sizeof(struct msghdr));
  3554. if (address != NULL) {
  3555. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3556. sin.sin6_family = AF_INET6;
  3557. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3558. sin.sin6_addr = address->ipv6;
  3559. msgHdr.msg_name = &sin;
  3560. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3561. }
  3562. msgHdr.msg_iov = (struct iovec*)buffers;
  3563. msgHdr.msg_iovlen = bufferCount;
  3564. sentLength = sendmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3565. if (sentLength == -1) {
  3566. if (errno == EWOULDBLOCK)
  3567. return 0;
  3568. return -1;
  3569. }
  3570. return sentLength;
  3571. }
  3572. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3573. struct msghdr msgHdr;
  3574. struct sockaddr_in6 sin;
  3575. int recvLength;
  3576. memset(&msgHdr, 0, sizeof(struct msghdr));
  3577. if (address != NULL) {
  3578. msgHdr.msg_name = &sin;
  3579. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3580. }
  3581. msgHdr.msg_iov = (struct iovec*)buffers;
  3582. msgHdr.msg_iovlen = bufferCount;
  3583. recvLength = recvmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3584. if (recvLength == -1) {
  3585. if (errno == EWOULDBLOCK)
  3586. return 0;
  3587. return -1;
  3588. }
  3589. if (msgHdr.msg_flags & MSG_TRUNC)
  3590. return -1;
  3591. if (address != NULL) {
  3592. address->ipv6 = sin.sin6_addr;
  3593. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3594. }
  3595. return recvLength;
  3596. }
  3597. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3598. struct timeval timeVal;
  3599. timeVal.tv_sec = timeout / 1000;
  3600. timeVal.tv_usec = (timeout % 1000) * 1000;
  3601. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3602. }
  3603. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3604. struct pollfd pollSocket;
  3605. int pollCount;
  3606. pollSocket.fd = socket;
  3607. pollSocket.events = 0;
  3608. if (*condition & ENET_SOCKET_WAIT_SEND)
  3609. pollSocket.events |= POLLOUT;
  3610. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3611. pollSocket.events |= POLLIN;
  3612. pollCount = poll(&pollSocket, 1, timeout);
  3613. if (pollCount < 0) {
  3614. if (errno == EINTR && *condition & ENET_SOCKET_WAIT_INTERRUPT) {
  3615. *condition = ENET_SOCKET_WAIT_INTERRUPT;
  3616. return 0;
  3617. }
  3618. return -1;
  3619. }
  3620. *condition = ENET_SOCKET_WAIT_NONE;
  3621. if (pollCount == 0)
  3622. return 0;
  3623. if (pollSocket.revents & POLLOUT)
  3624. *condition |= ENET_SOCKET_WAIT_SEND;
  3625. if (pollSocket.revents & POLLIN)
  3626. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3627. return 0;
  3628. }
  3629. #endif
  3630. /*
  3631. =======================================================================
  3632. Platform-specific (Windows)
  3633. =======================================================================
  3634. */
  3635. #ifdef _WIN32
  3636. int enet_initialize(void) {
  3637. WORD versionRequested = MAKEWORD(2, 2);
  3638. WSADATA wsaData;
  3639. if (WSAStartup(versionRequested, &wsaData))
  3640. return -1;
  3641. if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
  3642. WSACleanup();
  3643. return -1;
  3644. }
  3645. timeBeginPeriod(1);
  3646. return 0;
  3647. }
  3648. void enet_deinitialize(void) {
  3649. timeEndPeriod(1);
  3650. WSACleanup();
  3651. }
  3652. enet_uint64 enet_host_random_seed(void) {
  3653. return (enet_uint64)timeGetTime();
  3654. }
  3655. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3656. struct sockaddr_in6 sin;
  3657. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3658. sin.sin6_family = AF_INET6;
  3659. if (address != NULL) {
  3660. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3661. sin.sin6_addr = address->ipv6;
  3662. } else {
  3663. sin.sin6_port = 0;
  3664. sin.sin6_addr = in6addr_any;
  3665. }
  3666. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)) == SOCKET_ERROR ? -1 : 0;
  3667. }
  3668. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3669. struct sockaddr_in6 sin;
  3670. int sinLength = sizeof(struct sockaddr_in6);
  3671. if (getsockname(socket, (struct sockaddr*)&sin, &sinLength) == -1)
  3672. return -1;
  3673. address->ipv6 = sin.sin6_addr;
  3674. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3675. return 0;
  3676. }
  3677. int enet_socket_listen(ENetSocket socket, int backlog) {
  3678. return listen(socket, backlog < 0 ? SOMAXCONN : backlog) == SOCKET_ERROR ? -1 : 0;
  3679. }
  3680. ENetSocket enet_socket_create(ENetSocketType type) {
  3681. return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
  3682. }
  3683. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3684. int result = SOCKET_ERROR;
  3685. switch (option) {
  3686. case ENET_SOCKOPT_NONBLOCK: {
  3687. u_long nonBlocking = (u_long)value;
  3688. result = ioctlsocket(socket, FIONBIO, &nonBlocking);
  3689. break;
  3690. }
  3691. case ENET_SOCKOPT_BROADCAST:
  3692. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3693. break;
  3694. case ENET_SOCKOPT_REUSEADDR:
  3695. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3696. break;
  3697. case ENET_SOCKOPT_RCVBUF:
  3698. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3699. break;
  3700. case ENET_SOCKOPT_SNDBUF:
  3701. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3702. break;
  3703. case ENET_SOCKOPT_RCVTIMEO:
  3704. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&value, sizeof(int));
  3705. break;
  3706. case ENET_SOCKOPT_SNDTIMEO:
  3707. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&value, sizeof(int));
  3708. break;
  3709. case ENET_SOCKOPT_NODELAY:
  3710. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3711. break;
  3712. case ENET_SOCKOPT_IPV6_V6ONLY:
  3713. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (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. default:
  3728. break;
  3729. }
  3730. return result == SOCKET_ERROR ? -1 : 0;
  3731. }
  3732. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3733. int result = -1;
  3734. struct sockaddr_in6 sin;
  3735. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3736. sin.sin6_family = AF_INET6;
  3737. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3738. sin.sin6_addr = address->ipv6;
  3739. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3740. if (result == SOCKET_ERROR && WSAGetLastError() != WSAEWOULDBLOCK)
  3741. return -1;
  3742. return 0;
  3743. }
  3744. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3745. SOCKET result;
  3746. struct sockaddr_in6 sin;
  3747. int sinLength = sizeof(struct sockaddr_in6);
  3748. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3749. if (result == INVALID_SOCKET)
  3750. return ENET_SOCKET_NULL;
  3751. if (address != NULL) {
  3752. address->ipv6 = sin.sin6_addr;
  3753. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3754. }
  3755. return result;
  3756. }
  3757. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3758. return shutdown(socket, (int)how) == SOCKET_ERROR ? -1 : 0;
  3759. }
  3760. void enet_socket_destroy(ENetSocket socket) {
  3761. if (socket != INVALID_SOCKET)
  3762. closesocket(socket);
  3763. }
  3764. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3765. struct sockaddr_in6 sin;
  3766. DWORD sentLength;
  3767. if (address != NULL) {
  3768. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3769. sin.sin6_family = AF_INET6;
  3770. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3771. sin.sin6_addr = address->ipv6;
  3772. }
  3773. 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)
  3774. return (WSAGetLastError() == WSAEWOULDBLOCK) ? 0 : -1;
  3775. return (int)sentLength;
  3776. }
  3777. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3778. INT sinLength = sizeof(struct sockaddr_in6);
  3779. DWORD flags = 0, recvLength;
  3780. struct sockaddr_in6 sin;
  3781. if (WSARecvFrom(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &recvLength, &flags, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL, NULL, NULL) == SOCKET_ERROR) {
  3782. switch (WSAGetLastError()) {
  3783. case WSAEWOULDBLOCK:
  3784. case WSAECONNRESET:
  3785. return 0;
  3786. }
  3787. return -1;
  3788. }
  3789. if (flags & MSG_PARTIAL)
  3790. return -1;
  3791. if (address != NULL) {
  3792. address->ipv6 = sin.sin6_addr;
  3793. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3794. }
  3795. return (int)recvLength;
  3796. }
  3797. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3798. struct timeval timeVal;
  3799. timeVal.tv_sec = timeout / 1000;
  3800. timeVal.tv_usec = (timeout % 1000) * 1000;
  3801. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3802. }
  3803. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3804. fd_set readSet, writeSet;
  3805. struct timeval timeVal;
  3806. int selectCount;
  3807. timeVal.tv_sec = timeout / 1000;
  3808. timeVal.tv_usec = (timeout % 1000) * 1000;
  3809. FD_ZERO(&readSet);
  3810. FD_ZERO(&writeSet);
  3811. if (*condition & ENET_SOCKET_WAIT_SEND)
  3812. FD_SET(socket, &writeSet);
  3813. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3814. FD_SET(socket, &readSet);
  3815. selectCount = select(socket + 1, &readSet, &writeSet, NULL, &timeVal);
  3816. if (selectCount < 0)
  3817. return -1;
  3818. *condition = ENET_SOCKET_WAIT_NONE;
  3819. if (selectCount == 0)
  3820. return 0;
  3821. if (FD_ISSET(socket, &writeSet))
  3822. *condition |= ENET_SOCKET_WAIT_SEND;
  3823. if (FD_ISSET(socket, &readSet))
  3824. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3825. return 0;
  3826. }
  3827. #endif
  3828. /*
  3829. =======================================================================
  3830. Extended functionality
  3831. =======================================================================
  3832. */
  3833. void* enet_packet_get_data(const ENetPacket* packet) {
  3834. return (void*)packet->data;
  3835. }
  3836. int enet_packet_get_length(const ENetPacket* packet) {
  3837. return packet->dataLength;
  3838. }
  3839. void enet_packet_set_free_callback(ENetPacket* packet, const void* callback) {
  3840. packet->freeCallback = (ENetPacketFreeCallback)callback;
  3841. }
  3842. int enet_packet_check_references(const ENetPacket* packet) {
  3843. return (int)packet->referenceCount;
  3844. }
  3845. void enet_packet_dispose(ENetPacket* packet) {
  3846. if (packet->referenceCount == 0)
  3847. enet_packet_destroy(packet);
  3848. }
  3849. enet_uint32 enet_host_get_peers_count(const ENetHost* host) {
  3850. return host->connectedPeers;
  3851. }
  3852. enet_uint32 enet_host_get_packets_sent(const ENetHost* host) {
  3853. return host->totalSentPackets;
  3854. }
  3855. enet_uint32 enet_host_get_packets_received(const ENetHost* host) {
  3856. return host->totalReceivedPackets;
  3857. }
  3858. enet_uint32 enet_host_get_bytes_sent(const ENetHost* host) {
  3859. return host->totalSentData;
  3860. }
  3861. enet_uint32 enet_host_get_bytes_received(const ENetHost* host) {
  3862. return host->totalReceivedData;
  3863. }
  3864. enet_uint32 enet_peer_get_id(const ENetPeer* peer) {
  3865. return peer->incomingPeerID;
  3866. }
  3867. int enet_peer_get_ip(const ENetPeer* peer, char* ip, size_t ipLength) {
  3868. return enet_address_get_host_ip(&peer->address, ip, ipLength);
  3869. }
  3870. enet_uint16 enet_peer_get_port(const ENetPeer* peer) {
  3871. return peer->address.port;
  3872. }
  3873. enet_uint32 enet_peer_get_mtu(const ENetPeer* peer) {
  3874. return peer->mtu;
  3875. }
  3876. ENetPeerState enet_peer_get_state(const ENetPeer* peer) {
  3877. return peer->state;
  3878. }
  3879. enet_uint32 enet_peer_get_rtt(const ENetPeer* peer) {
  3880. return peer->smoothedRoundTripTime;
  3881. }
  3882. enet_uint32 enet_peer_get_lastsendtime(const ENetPeer* peer) {
  3883. return peer->lastSendTime;
  3884. }
  3885. enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer* peer) {
  3886. return peer->lastReceiveTime;
  3887. }
  3888. enet_uint64 enet_peer_get_packets_sent(const ENetPeer* peer) {
  3889. return peer->totalPacketsSent;
  3890. }
  3891. enet_uint64 enet_peer_get_packets_lost(const ENetPeer* peer) {
  3892. return peer->totalPacketsLost;
  3893. }
  3894. enet_uint64 enet_peer_get_bytes_sent(const ENetPeer* peer) {
  3895. return peer->totalDataSent;
  3896. }
  3897. enet_uint64 enet_peer_get_bytes_received(const ENetPeer* peer) {
  3898. return peer->totalDataReceived;
  3899. }
  3900. void* enet_peer_get_data(const ENetPeer* peer) {
  3901. return (void*)peer->data;
  3902. }
  3903. void enet_peer_set_data(ENetPeer* peer, const void* data) {
  3904. peer->data = (enet_uint32*)data;
  3905. }
  3906. #ifdef __cplusplus
  3907. }
  3908. #endif
  3909. #endif
  3910. #endif