enet.h 175 KB

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  1. /*
  2. * ENet reliable UDP networking library
  3. * Improvements (c) SoftwareGuy (Coburn), c6burns
  4. * Original copyright (c) 2018 Lee Salzman, Vladyslav Hrytsenko, Dominik Madarász, Stanislav Denisov
  5. *
  6. * Permission is hereby granted, free of charge, to any person obtaining a copy
  7. * of this software and associated documentation files (the "Software"), to deal
  8. * in the Software without restriction, including without limitation the rights
  9. * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10. * copies of the Software, and to permit persons to whom the Software is
  11. * furnished to do so, subject to the following conditions:
  12. *
  13. * The above copyright notice and this permission notice shall be included in all
  14. * copies or substantial portions of the Software.
  15. *
  16. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19. * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22. * SOFTWARE.
  23. */
  24. #ifndef ENET_H
  25. #define ENET_H
  26. #include <stdarg.h>
  27. #include <stdbool.h>
  28. #include <stdint.h>
  29. #include <stdio.h>
  30. #include <stdlib.h>
  31. #include <time.h>
  32. #define ENET_VERSION_MAJOR 2
  33. #define ENET_VERSION_MINOR 3
  34. #define ENET_VERSION_PATCH 0
  35. #define ENET_VERSION_CREATE(major, minor, patch) (((major) << 16) | ((minor) << 8) | (patch))
  36. #define ENET_VERSION_GET_MAJOR(version) (((version) >> 16) & 0xFF)
  37. #define ENET_VERSION_GET_MINOR(version) (((version) >> 8) & 0xFF)
  38. #define ENET_VERSION_GET_PATCH(version) ((version) & 0xFF)
  39. #define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH)
  40. #define ENET_TIME_OVERFLOW 86400000
  41. #define ENET_TIME_LESS(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW)
  42. #define ENET_TIME_GREATER(a, b) ((b) - (a) >= ENET_TIME_OVERFLOW)
  43. #define ENET_TIME_LESS_EQUAL(a, b) (!ENET_TIME_GREATER(a, b))
  44. #define ENET_TIME_GREATER_EQUAL(a, b) (!ENET_TIME_LESS(a, b))
  45. #define ENET_TIME_DIFFERENCE(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW ? (b) - (a) : (a) - (b))
  46. #define ENET_MAX(x, y) ((x) > (y) ? (x) : (y))
  47. #define ENET_MIN(x, y) ((x) < (y) ? (x) : (y))
  48. #define ENET_SRTT_INITIAL 1.0
  49. #define ENET_SRTT_PARA_G 0.125
  50. static FILE *enet_log_fp = NULL;
  51. enum enet_log_type
  52. {
  53. ENET_LOG_TYPE_TRACE,
  54. ENET_LOG_TYPE_ERROR,
  55. };
  56. static const char *const enet_log_type_names[] = {
  57. [ENET_LOG_TYPE_TRACE] = "TRACE",
  58. [ENET_LOG_TYPE_ERROR] = "ERROR",
  59. };
  60. #if ENET_DEBUG
  61. #define ENET_LOG_TRACE(...) enet_log(ENET_LOG_TYPE_TRACE, __FUNCTION__, __LINE__, __VA_ARGS__)
  62. #define ENET_LOG_ERROR(...) enet_log(ENET_LOG_TYPE_ERROR, __FUNCTION__, __LINE__, __VA_ARGS__)
  63. #else
  64. #define ENET_LOG_TRACE(...) ((void)0)
  65. #define ENET_LOG_ERROR(...) ((void)0)
  66. #endif
  67. #define ENET_LOG_FILE "enet_log.txt"
  68. static inline void enet_log(enum enet_log_type type, const char *func, int line, const char *fmt, ...)
  69. {
  70. if (!enet_log_fp) enet_log_fp = fopen(ENET_LOG_FILE, "a");
  71. if (!enet_log_fp) return;
  72. va_list args;
  73. time_t tstamp = time(NULL);
  74. struct tm *local_time = localtime(&tstamp);
  75. char time_buf[64];
  76. time_buf[strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S", local_time)] = '\0';
  77. fprintf(enet_log_fp, "%s [%s] [%s:%d] ", time_buf, enet_log_type_names[type], func, line);
  78. va_start(args, fmt);
  79. vfprintf(enet_log_fp, fmt, args);
  80. va_end(args);
  81. fflush(enet_log_fp);
  82. }
  83. /*
  84. =======================================================================
  85. System differences
  86. =======================================================================
  87. */
  88. #ifdef _WIN32
  89. #if defined(_MSC_VER) && defined(ENET_IMPLEMENTATION)
  90. #pragma warning(disable: 4244) /* 64-bit to 32-bit integer conversion */
  91. #pragma warning(disable: 4267) /* size_t to integer conversion */
  92. #endif
  93. #ifndef ENET_NO_PRAGMA_LINK
  94. #pragma comment(lib, "ws2_32.lib")
  95. #pragma comment(lib, "winmm.lib")
  96. #endif
  97. #if _MSC_VER >= 1910
  98. /* It looks like there were changes as of Visual Studio 2017 and there are no 32/64 bit
  99. versions of _InterlockedExchange[operation], only InterlockedExchange[operation]
  100. (without leading underscore), so we have to distinguish between compiler versions */
  101. #define NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  102. #endif
  103. #ifdef __GNUC__
  104. #if (_WIN32_WINNT < 0x0501)
  105. #undef _WIN32_WINNT
  106. #define _WIN32_WINNT 0x0501
  107. #endif
  108. #endif
  109. #include <winsock2.h>
  110. #include <ws2tcpip.h>
  111. #include <mmsystem.h>
  112. #include <intrin.h>
  113. #if defined(_WIN32) && defined(_MSC_VER)
  114. #if _MSC_VER < 1900
  115. typedef struct timespec {
  116. long tv_sec;
  117. long tv_nsec;
  118. };
  119. #endif
  120. #define CLOCK_MONOTONIC 0
  121. #endif
  122. typedef SOCKET ENetSocket;
  123. #define ENET_SOCKET_NULL INVALID_SOCKET
  124. typedef struct {
  125. size_t dataLength;
  126. void* data;
  127. } ENetBuffer;
  128. #define ENET_CALLBACK __cdecl
  129. #ifdef ENET_DLL
  130. #ifdef ENET_IMPLEMENTATION
  131. #define ENET_API __declspec(dllexport)
  132. #else
  133. #define ENET_API __declspec(dllimport)
  134. #endif
  135. #else
  136. #define ENET_API extern
  137. #endif
  138. #else
  139. #include <sys/types.h>
  140. #include <sys/ioctl.h>
  141. #include <sys/time.h>
  142. #include <sys/socket.h>
  143. #include <poll.h>
  144. #include <arpa/inet.h>
  145. #include <netinet/in.h>
  146. #include <netinet/tcp.h>
  147. #include <netdb.h>
  148. #include <unistd.h>
  149. #include <string.h>
  150. #include <errno.h>
  151. #include <fcntl.h>
  152. #ifdef __APPLE__
  153. #include <mach/clock.h>
  154. #include <mach/mach.h>
  155. #include <Availability.h>
  156. #endif
  157. #ifndef MSG_NOSIGNAL
  158. #define MSG_NOSIGNAL 0
  159. #endif
  160. #ifdef MSG_MAXIOVLEN
  161. #define ENET_BUFFER_MAXIMUM MSG_MAXIOVLEN
  162. #endif
  163. typedef int ENetSocket;
  164. #define ENET_SOCKET_NULL -1
  165. typedef struct {
  166. void* data;
  167. size_t dataLength;
  168. } ENetBuffer;
  169. #define ENET_CALLBACK
  170. #define ENET_API extern
  171. #endif
  172. #ifndef ENET_BUFFER_MAXIMUM
  173. #define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS)
  174. #endif
  175. #define ENET_HOST_ANY in6addr_any
  176. #define ENET_PORT_ANY 0
  177. #define ENET_HOST_SIZE 1025
  178. #define ENET_HOST_TO_NET_16(value) (htons(value))
  179. #define ENET_HOST_TO_NET_32(value) (htonl(value))
  180. #define ENET_NET_TO_HOST_16(value) (ntohs(value))
  181. #define ENET_NET_TO_HOST_32(value) (ntohl(value))
  182. #ifdef __cplusplus
  183. extern "C" {
  184. #endif
  185. /*
  186. =======================================================================
  187. Internals
  188. =======================================================================
  189. */
  190. typedef uint8_t enet_uint8;
  191. typedef uint16_t enet_uint16;
  192. typedef uint32_t enet_uint32;
  193. typedef uint64_t enet_uint64;
  194. typedef enet_uint32 ENetVersion;
  195. typedef fd_set ENetSocketSet;
  196. typedef struct _ENetCallbacks {
  197. void* (ENET_CALLBACK *malloc)(size_t size);
  198. void (ENET_CALLBACK *free)(void* memory);
  199. void (ENET_CALLBACK *noMemory)(void);
  200. } ENetCallbacks;
  201. extern void* enet_malloc(size_t);
  202. extern void enet_free(void*);
  203. typedef struct _ENetListNode {
  204. struct _ENetListNode* next;
  205. struct _ENetListNode* previous;
  206. } ENetListNode;
  207. typedef ENetListNode* ENetListIterator;
  208. typedef struct _ENetList {
  209. ENetListNode sentinel;
  210. } ENetList;
  211. extern ENetListIterator enet_list_insert(ENetListIterator, void*);
  212. extern ENetListIterator enet_list_move(ENetListIterator, void*, void*);
  213. extern void* enet_list_remove(ENetListIterator);
  214. extern void enet_list_clear(ENetList*);
  215. extern size_t enet_list_size(ENetList*);
  216. #define enet_list_begin(list) ((list)->sentinel.next)
  217. #define enet_list_end(list) (&(list)->sentinel)
  218. #define enet_list_empty(list) (enet_list_begin(list) == enet_list_end(list))
  219. #define enet_list_next(iterator) ((iterator)->next)
  220. #define enet_list_previous(iterator) ((iterator)->previous)
  221. #define enet_list_front(list) ((void*)(list)->sentinel.next)
  222. #define enet_list_back(list) ((void*)(list)->sentinel.previous)
  223. #ifndef IN4ADDR
  224. #define IN4ADDR
  225. struct in4_addr {
  226. uint8_t zeros[10];
  227. uint16_t ffff;
  228. struct in_addr ip;
  229. };
  230. #endif
  231. /*
  232. =======================================================================
  233. Protocol
  234. =======================================================================
  235. */
  236. enum {
  237. ENET_PROTOCOL_MINIMUM_MTU = 576,
  238. ENET_PROTOCOL_MAXIMUM_MTU = 4096,
  239. ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS = 32,
  240. ENET_PROTOCOL_MINIMUM_WINDOW_SIZE = 4096,
  241. ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE = 65536,
  242. ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT = 1,
  243. ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT = 255,
  244. ENET_PROTOCOL_MAXIMUM_PEER_ID = 0xFFF,
  245. ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT = 1024 * 1024
  246. };
  247. typedef enum _ENetProtocolCommand {
  248. ENET_PROTOCOL_COMMAND_NONE = 0,
  249. ENET_PROTOCOL_COMMAND_ACKNOWLEDGE = 1,
  250. ENET_PROTOCOL_COMMAND_CONNECT = 2,
  251. ENET_PROTOCOL_COMMAND_VERIFY_CONNECT = 3,
  252. ENET_PROTOCOL_COMMAND_DISCONNECT = 4,
  253. ENET_PROTOCOL_COMMAND_PING = 5,
  254. ENET_PROTOCOL_COMMAND_SEND_RELIABLE = 6,
  255. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE = 7,
  256. ENET_PROTOCOL_COMMAND_SEND_FRAGMENT = 8,
  257. ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED = 9,
  258. ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT = 10,
  259. ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE = 11,
  260. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT = 12,
  261. ENET_PROTOCOL_COMMAND_COUNT = 13,
  262. ENET_PROTOCOL_COMMAND_MASK = 0x0F
  263. } ENetProtocolCommand;
  264. typedef enum _ENetProtocolFlag {
  265. ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE = (1 << 7),
  266. ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED = (1 << 6),
  267. ENET_PROTOCOL_HEADER_FLAG_SENT_TIME = (1 << 14),
  268. ENET_PROTOCOL_HEADER_FLAG_COMPRESSED = (1 << 15),
  269. ENET_PROTOCOL_HEADER_FLAG_MASK = ENET_PROTOCOL_HEADER_FLAG_SENT_TIME | ENET_PROTOCOL_HEADER_FLAG_COMPRESSED,
  270. ENET_PROTOCOL_HEADER_SESSION_MASK = (3 << 12),
  271. ENET_PROTOCOL_HEADER_SESSION_SHIFT = 12
  272. } ENetProtocolFlag;
  273. #ifdef _MSC_VER
  274. #pragma pack(push, 1)
  275. #define ENET_PACKED
  276. #elif defined(__GNUC__) || defined(__clang__)
  277. #define ENET_PACKED __attribute__ ((packed))
  278. #else
  279. #define ENET_PACKED
  280. #endif
  281. typedef struct _ENetProtocolHeader {
  282. enet_uint16 peerID;
  283. enet_uint16 sentTime;
  284. } ENET_PACKED ENetProtocolHeader;
  285. typedef struct _ENetProtocolCommandHeader {
  286. enet_uint8 command;
  287. enet_uint8 channelID;
  288. enet_uint16 reliableSequenceNumber;
  289. } ENET_PACKED ENetProtocolCommandHeader;
  290. typedef struct _ENetProtocolAcknowledge {
  291. ENetProtocolCommandHeader header;
  292. enet_uint16 receivedReliableSequenceNumber;
  293. enet_uint16 receivedSentTime;
  294. } ENET_PACKED ENetProtocolAcknowledge;
  295. typedef struct _ENetProtocolConnect {
  296. ENetProtocolCommandHeader header;
  297. enet_uint16 outgoingPeerID;
  298. enet_uint8 incomingSessionID;
  299. enet_uint8 outgoingSessionID;
  300. enet_uint32 mtu;
  301. enet_uint32 windowSize;
  302. enet_uint32 channelCount;
  303. enet_uint32 incomingBandwidth;
  304. enet_uint32 outgoingBandwidth;
  305. enet_uint32 packetThrottleInterval;
  306. enet_uint32 packetThrottleAcceleration;
  307. enet_uint32 packetThrottleDeceleration;
  308. enet_uint32 connectID;
  309. enet_uint32 data;
  310. } ENET_PACKED ENetProtocolConnect;
  311. typedef struct _ENetProtocolVerifyConnect {
  312. ENetProtocolCommandHeader header;
  313. enet_uint16 outgoingPeerID;
  314. enet_uint8 incomingSessionID;
  315. enet_uint8 outgoingSessionID;
  316. enet_uint32 mtu;
  317. enet_uint32 windowSize;
  318. enet_uint32 channelCount;
  319. enet_uint32 incomingBandwidth;
  320. enet_uint32 outgoingBandwidth;
  321. enet_uint32 packetThrottleInterval;
  322. enet_uint32 packetThrottleAcceleration;
  323. enet_uint32 packetThrottleDeceleration;
  324. enet_uint32 connectID;
  325. } ENET_PACKED ENetProtocolVerifyConnect;
  326. typedef struct _ENetProtocolBandwidthLimit {
  327. ENetProtocolCommandHeader header;
  328. enet_uint32 incomingBandwidth;
  329. enet_uint32 outgoingBandwidth;
  330. } ENET_PACKED ENetProtocolBandwidthLimit;
  331. typedef struct _ENetProtocolThrottleConfigure {
  332. ENetProtocolCommandHeader header;
  333. enet_uint32 packetThrottleInterval;
  334. enet_uint32 packetThrottleAcceleration;
  335. enet_uint32 packetThrottleDeceleration;
  336. } ENET_PACKED ENetProtocolThrottleConfigure;
  337. typedef struct _ENetProtocolDisconnect {
  338. ENetProtocolCommandHeader header;
  339. enet_uint32 data;
  340. } ENET_PACKED ENetProtocolDisconnect;
  341. typedef struct _ENetProtocolPing {
  342. ENetProtocolCommandHeader header;
  343. } ENET_PACKED ENetProtocolPing;
  344. typedef struct _ENetProtocolSendReliable {
  345. ENetProtocolCommandHeader header;
  346. enet_uint16 dataLength;
  347. } ENET_PACKED ENetProtocolSendReliable;
  348. typedef struct _ENetProtocolSendUnreliable {
  349. ENetProtocolCommandHeader header;
  350. enet_uint16 unreliableSequenceNumber;
  351. enet_uint16 dataLength;
  352. } ENET_PACKED ENetProtocolSendUnreliable;
  353. typedef struct _ENetProtocolSendUnsequenced {
  354. ENetProtocolCommandHeader header;
  355. enet_uint16 unsequencedGroup;
  356. enet_uint16 dataLength;
  357. } ENET_PACKED ENetProtocolSendUnsequenced;
  358. typedef struct _ENetProtocolSendFragment {
  359. ENetProtocolCommandHeader header;
  360. enet_uint16 startSequenceNumber;
  361. enet_uint16 dataLength;
  362. enet_uint32 fragmentCount;
  363. enet_uint32 fragmentNumber;
  364. enet_uint32 totalLength;
  365. enet_uint32 fragmentOffset;
  366. } ENET_PACKED ENetProtocolSendFragment;
  367. typedef union _ENetProtocol {
  368. ENetProtocolCommandHeader header;
  369. ENetProtocolAcknowledge acknowledge;
  370. ENetProtocolConnect connect;
  371. ENetProtocolVerifyConnect verifyConnect;
  372. ENetProtocolDisconnect disconnect;
  373. ENetProtocolPing ping;
  374. ENetProtocolSendReliable sendReliable;
  375. ENetProtocolSendUnreliable sendUnreliable;
  376. ENetProtocolSendUnsequenced sendUnsequenced;
  377. ENetProtocolSendFragment sendFragment;
  378. ENetProtocolBandwidthLimit bandwidthLimit;
  379. ENetProtocolThrottleConfigure throttleConfigure;
  380. } ENET_PACKED ENetProtocol;
  381. #ifdef _MSC_VER
  382. #pragma pack(pop)
  383. #endif
  384. /*
  385. =======================================================================
  386. General structs/enums
  387. =======================================================================
  388. */
  389. typedef enum _ENetSocketType {
  390. ENET_SOCKET_TYPE_STREAM = 1,
  391. ENET_SOCKET_TYPE_DATAGRAM = 2
  392. } ENetSocketType;
  393. typedef enum _ENetSocketWait {
  394. ENET_SOCKET_WAIT_NONE = 0,
  395. ENET_SOCKET_WAIT_SEND = (1 << 0),
  396. ENET_SOCKET_WAIT_RECEIVE = (1 << 1),
  397. ENET_SOCKET_WAIT_INTERRUPT = (1 << 2)
  398. } ENetSocketWait;
  399. typedef enum _ENetSocketOption {
  400. ENET_SOCKOPT_NONBLOCK = 1,
  401. ENET_SOCKOPT_BROADCAST = 2,
  402. ENET_SOCKOPT_RCVBUF = 3,
  403. ENET_SOCKOPT_SNDBUF = 4,
  404. ENET_SOCKOPT_REUSEADDR = 5,
  405. ENET_SOCKOPT_RCVTIMEO = 6,
  406. ENET_SOCKOPT_SNDTIMEO = 7,
  407. ENET_SOCKOPT_ERROR = 8,
  408. ENET_SOCKOPT_NODELAY = 9,
  409. ENET_SOCKOPT_IPV6_V6ONLY = 10
  410. } ENetSocketOption;
  411. typedef enum _ENetSocketShutdown {
  412. ENET_SOCKET_SHUTDOWN_READ = 0,
  413. ENET_SOCKET_SHUTDOWN_WRITE = 1,
  414. ENET_SOCKET_SHUTDOWN_READ_WRITE = 2
  415. } ENetSocketShutdown;
  416. typedef struct _ENetAddress {
  417. union {
  418. struct in6_addr ipv6;
  419. struct in4_addr ipv4;
  420. };
  421. uint16_t port;
  422. } ENetAddress;
  423. #define in6_equal(a, b) (memcmp(&a, &b, sizeof(struct in6_addr)) == 0)
  424. typedef enum _ENetPacketFlag {
  425. ENET_PACKET_FLAG_NONE = 0,
  426. ENET_PACKET_FLAG_RELIABLE = (1 << 0),
  427. ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1),
  428. ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2),
  429. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED = (1 << 3),
  430. ENET_PACKET_FLAG_INSTANT = (1 << 4),
  431. ENET_PACKET_FLAG_SENT = (1 << 8)
  432. } ENetPacketFlag;
  433. typedef void (ENET_CALLBACK *ENetPacketFreeCallback)(void*);
  434. typedef struct _ENetPacket {
  435. enet_uint32 flags;
  436. enet_uint32 dataLength;
  437. enet_uint8* data;
  438. ENetPacketFreeCallback freeCallback;
  439. enet_uint32 referenceCount;
  440. } ENetPacket;
  441. typedef struct _ENetAcknowledgement {
  442. ENetListNode acknowledgementList;
  443. enet_uint32 sentTime;
  444. ENetProtocol command;
  445. } ENetAcknowledgement;
  446. typedef struct _ENetOutgoingCommand {
  447. ENetListNode outgoingCommandList;
  448. enet_uint16 reliableSequenceNumber;
  449. enet_uint16 unreliableSequenceNumber;
  450. enet_uint32 sentTime;
  451. enet_uint32 roundTripTimeout;
  452. enet_uint32 roundTripTimeoutLimit;
  453. enet_uint32 fragmentOffset;
  454. enet_uint16 fragmentLength;
  455. enet_uint16 sendAttempts;
  456. ENetProtocol command;
  457. ENetPacket* packet;
  458. } ENetOutgoingCommand;
  459. typedef struct _ENetIncomingCommand {
  460. ENetListNode incomingCommandList;
  461. enet_uint16 reliableSequenceNumber;
  462. enet_uint16 unreliableSequenceNumber;
  463. ENetProtocol command;
  464. enet_uint32 fragmentCount;
  465. enet_uint32 fragmentsRemaining;
  466. enet_uint32* fragments;
  467. ENetPacket* packet;
  468. } ENetIncomingCommand;
  469. typedef enum _ENetPeerState {
  470. ENET_PEER_STATE_DISCONNECTED = 0,
  471. ENET_PEER_STATE_CONNECTING = 1,
  472. ENET_PEER_STATE_ACKNOWLEDGING_CONNECT = 2,
  473. ENET_PEER_STATE_CONNECTION_PENDING = 3,
  474. ENET_PEER_STATE_CONNECTION_SUCCEEDED = 4,
  475. ENET_PEER_STATE_CONNECTED = 5,
  476. ENET_PEER_STATE_DISCONNECT_LATER = 6,
  477. ENET_PEER_STATE_DISCONNECTING = 7,
  478. ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT = 8,
  479. ENET_PEER_STATE_ZOMBIE = 9
  480. } ENetPeerState;
  481. enum {
  482. ENET_HOST_BUFFER_SIZE_MIN = 256 * 1024,
  483. ENET_HOST_BUFFER_SIZE_MAX = 1024 * 1024,
  484. ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000,
  485. ENET_HOST_DEFAULT_MTU = 1280,
  486. ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024,
  487. ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
  488. ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 500,
  489. ENET_PEER_DEFAULT_PACKET_THROTTLE = 32,
  490. ENET_PEER_PACKET_THROTTLE_SCALE = 32,
  491. ENET_PEER_PACKET_THROTTLE_COUNTER = 7,
  492. ENET_PEER_PACKET_THROTTLE_ACCELERATION = 2,
  493. ENET_PEER_PACKET_THROTTLE_DECELERATION = 2,
  494. ENET_PEER_PACKET_THROTTLE_INTERVAL = 5000,
  495. ENET_PEER_PACKET_LOSS_SCALE = (1 << 16),
  496. ENET_PEER_PACKET_LOSS_INTERVAL = 10000,
  497. ENET_PEER_WINDOW_SIZE_SCALE = 64 * 1024,
  498. ENET_PEER_TIMEOUT_LIMIT = 32,
  499. ENET_PEER_TIMEOUT_MINIMUM = 5000,
  500. ENET_PEER_TIMEOUT_MAXIMUM = 30000,
  501. ENET_PEER_PING_INTERVAL = 500,
  502. ENET_PEER_UNSEQUENCED_WINDOWS = 64,
  503. ENET_PEER_UNSEQUENCED_WINDOW_SIZE = 1024,
  504. ENET_PEER_FREE_UNSEQUENCED_WINDOWS = 32,
  505. ENET_PEER_RELIABLE_WINDOWS = 16,
  506. ENET_PEER_RELIABLE_WINDOW_SIZE = 0x1000,
  507. ENET_PEER_FREE_RELIABLE_WINDOWS = 8
  508. };
  509. typedef struct _ENetChannel {
  510. enet_uint16 outgoingReliableSequenceNumber;
  511. enet_uint16 outgoingUnreliableSequenceNumber;
  512. enet_uint16 usedReliableWindows;
  513. enet_uint16 reliableWindows[ENET_PEER_RELIABLE_WINDOWS];
  514. enet_uint16 incomingReliableSequenceNumber;
  515. enet_uint16 incomingUnreliableSequenceNumber;
  516. ENetList incomingReliableCommands;
  517. ENetList incomingUnreliableCommands;
  518. } ENetChannel;
  519. typedef struct _ENetPeer {
  520. ENetListNode dispatchList;
  521. struct _ENetHost* host;
  522. enet_uint16 outgoingPeerID;
  523. enet_uint16 incomingPeerID;
  524. enet_uint32 connectID;
  525. enet_uint8 outgoingSessionID;
  526. enet_uint8 incomingSessionID;
  527. ENetAddress address;
  528. void* data;
  529. ENetPeerState state;
  530. ENetChannel* channels;
  531. size_t channelCount;
  532. enet_uint32 incomingBandwidth;
  533. enet_uint32 outgoingBandwidth;
  534. enet_uint32 incomingBandwidthThrottleEpoch;
  535. enet_uint32 outgoingBandwidthThrottleEpoch;
  536. enet_uint32 incomingDataTotal;
  537. enet_uint64 totalDataReceived;
  538. enet_uint32 outgoingDataTotal;
  539. enet_uint64 totalDataSent;
  540. enet_uint32 lastSendTime;
  541. enet_uint32 lastReceiveTime;
  542. enet_uint32 nextTimeout;
  543. enet_uint32 earliestTimeout;
  544. enet_uint32 packetLossEpoch;
  545. enet_uint32 packetsSent;
  546. enet_uint64 totalPacketsSent;
  547. enet_uint32 packetsLost;
  548. enet_uint64 totalPacketsLost;
  549. enet_uint32 packetLoss;
  550. enet_uint32 packetLossVariance;
  551. enet_uint32 packetThrottle;
  552. enet_uint32 packetThrottleThreshold;
  553. enet_uint32 packetThrottleLimit;
  554. enet_uint32 packetThrottleCounter;
  555. enet_uint32 packetThrottleEpoch;
  556. enet_uint32 packetThrottleAcceleration;
  557. enet_uint32 packetThrottleDeceleration;
  558. enet_uint32 packetThrottleInterval;
  559. enet_uint32 pingInterval;
  560. enet_uint32 timeoutLimit;
  561. enet_uint32 timeoutMinimum;
  562. enet_uint32 timeoutMaximum;
  563. enet_uint32 smoothedRoundTripTime;
  564. enet_uint32 lastRoundTripTime;
  565. enet_uint32 lowestRoundTripTime;
  566. enet_uint32 lastRoundTripTimeVariance;
  567. enet_uint32 highestRoundTripTimeVariance;
  568. enet_uint32 roundTripTime;
  569. enet_uint32 roundTripTimeVariance;
  570. enet_uint32 mtu;
  571. enet_uint32 windowSize;
  572. enet_uint32 reliableDataInTransit;
  573. enet_uint16 outgoingReliableSequenceNumber;
  574. ENetList acknowledgements;
  575. ENetList sentReliableCommands;
  576. ENetList sentUnreliableCommands;
  577. ENetList outgoingReliableCommands;
  578. ENetList outgoingUnreliableCommands;
  579. ENetList dispatchedCommands;
  580. int needsDispatch;
  581. enet_uint16 incomingUnsequencedGroup;
  582. enet_uint16 outgoingUnsequencedGroup;
  583. enet_uint32 unsequencedWindow[ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32];
  584. enet_uint32 eventData;
  585. size_t totalWaitingData;
  586. } ENetPeer;
  587. typedef enet_uint32 (ENET_CALLBACK *ENetChecksumCallback)(const ENetBuffer* buffers, size_t bufferCount);
  588. typedef int (ENET_CALLBACK *ENetInterceptCallback)(struct _ENetHost* host, void* event);
  589. typedef struct _ENetHost {
  590. ENetSocket socket;
  591. ENetAddress address;
  592. enet_uint32 incomingBandwidth;
  593. enet_uint32 outgoingBandwidth;
  594. enet_uint32 bandwidthThrottleEpoch;
  595. enet_uint32 mtu;
  596. enet_uint32 randomSeed;
  597. int recalculateBandwidthLimits;
  598. enet_uint8 preventConnections;
  599. ENetPeer* peers;
  600. size_t peerCount;
  601. size_t channelLimit;
  602. enet_uint32 serviceTime;
  603. ENetList dispatchQueue;
  604. int continueSending;
  605. size_t packetSize;
  606. enet_uint16 headerFlags;
  607. enet_uint32 totalSentData;
  608. enet_uint32 totalSentPackets;
  609. enet_uint32 totalReceivedData;
  610. enet_uint32 totalReceivedPackets;
  611. ENetProtocol commands[ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
  612. size_t commandCount;
  613. ENetBuffer buffers[ENET_BUFFER_MAXIMUM];
  614. size_t bufferCount;
  615. enet_uint8 compression;
  616. char* compressionBuffer;
  617. size_t compressionBufferSize;
  618. ENetChecksumCallback checksumCallback;
  619. enet_uint8 packetData[2][ENET_PROTOCOL_MAXIMUM_MTU];
  620. ENetAddress receivedAddress;
  621. enet_uint8* receivedData;
  622. size_t receivedDataLength;
  623. ENetInterceptCallback interceptCallback;
  624. size_t connectedPeers;
  625. size_t bandwidthLimitedPeers;
  626. size_t duplicatePeers;
  627. size_t maximumPacketSize;
  628. size_t maximumWaitingData;
  629. } ENetHost;
  630. typedef enum _ENetEventType {
  631. ENET_EVENT_TYPE_NONE = 0,
  632. ENET_EVENT_TYPE_CONNECT = 1,
  633. ENET_EVENT_TYPE_DISCONNECT = 2,
  634. ENET_EVENT_TYPE_RECEIVE = 3,
  635. ENET_EVENT_TYPE_DISCONNECT_TIMEOUT = 4
  636. } ENetEventType;
  637. typedef struct _ENetEvent {
  638. ENetEventType type;
  639. ENetPeer* peer;
  640. enet_uint8 channelID;
  641. enet_uint32 data;
  642. ENetPacket* packet;
  643. } ENetEvent;
  644. /*
  645. =======================================================================
  646. Public API
  647. =======================================================================
  648. */
  649. ENET_API int enet_initialize(void);
  650. ENET_API int enet_initialize_with_callbacks(ENetVersion, const ENetCallbacks*);
  651. ENET_API void enet_deinitialize(void);
  652. ENET_API ENetVersion enet_linked_version(void);
  653. ENET_API int enet_array_is_zeroed(const uint8_t*, int);
  654. ENET_API size_t enet_string_copy(char*, const char*, size_t);
  655. ENET_API enet_uint32 enet_time_get(void);
  656. ENET_API enet_uint32 enet_crc32(const ENetBuffer*, size_t);
  657. ENET_API ENetPacket* enet_packet_create(const void*, size_t, enet_uint32);
  658. ENET_API ENetPacket* enet_packet_create_offset(const void*, size_t, size_t, enet_uint32);
  659. ENET_API void enet_packet_destroy(ENetPacket*);
  660. ENET_API int enet_peer_send(ENetPeer*, enet_uint8, ENetPacket*);
  661. ENET_API ENetPacket* enet_peer_receive(ENetPeer*, enet_uint8*);
  662. ENET_API void enet_peer_ping(ENetPeer*);
  663. ENET_API void enet_peer_ping_interval(ENetPeer*, enet_uint32);
  664. ENET_API void enet_peer_timeout(ENetPeer*, enet_uint32, enet_uint32, enet_uint32);
  665. ENET_API void enet_peer_reset(ENetPeer*);
  666. ENET_API void enet_peer_disconnect(ENetPeer*, enet_uint32);
  667. ENET_API void enet_peer_disconnect_now(ENetPeer*, enet_uint32);
  668. ENET_API void enet_peer_disconnect_later(ENetPeer*, enet_uint32);
  669. ENET_API void enet_peer_throttle_configure(ENetPeer*, enet_uint32, enet_uint32, enet_uint32, enet_uint32);
  670. ENET_API ENetHost* enet_host_create(const ENetAddress*, size_t, size_t, enet_uint32, enet_uint32, int);
  671. ENET_API void enet_host_destroy(ENetHost*);
  672. ENET_API void enet_host_enable_compression(ENetHost*);
  673. ENET_API void enet_host_prevent_connections(ENetHost*, enet_uint8);
  674. ENET_API ENetPeer* enet_host_connect(ENetHost*, const ENetAddress*, size_t, enet_uint32);
  675. ENET_API int enet_host_check_events(ENetHost*, ENetEvent*);
  676. ENET_API int enet_host_service(ENetHost*, ENetEvent*, enet_uint32);
  677. ENET_API void enet_host_flush(ENetHost*);
  678. ENET_API void enet_host_broadcast(ENetHost*, enet_uint8, ENetPacket*);
  679. ENET_API void enet_host_broadcast_exclude(ENetHost*, enet_uint8, ENetPacket*, ENetPeer*);
  680. ENET_API void enet_host_broadcast_selective(ENetHost*, enet_uint8, ENetPacket*, ENetPeer**, size_t);
  681. ENET_API void enet_host_channel_limit(ENetHost*, size_t);
  682. ENET_API void enet_host_bandwidth_limit(ENetHost*, enet_uint32, enet_uint32);
  683. ENET_API int enet_address_set_host_ip(ENetAddress*, const char*);
  684. ENET_API int enet_address_set_host(ENetAddress*, const char*);
  685. ENET_API int enet_address_get_host_ip(const ENetAddress*, char*, size_t);
  686. ENET_API int enet_address_get_host(const ENetAddress*, char*, size_t);
  687. ENET_API ENetSocket enet_socket_create(ENetSocketType);
  688. ENET_API int enet_socket_bind(ENetSocket, const ENetAddress*);
  689. ENET_API int enet_socket_get_address(ENetSocket, ENetAddress*);
  690. ENET_API int enet_socket_listen(ENetSocket, int);
  691. ENET_API ENetSocket enet_socket_accept(ENetSocket, ENetAddress*);
  692. ENET_API int enet_socket_connect(ENetSocket, const ENetAddress*);
  693. ENET_API int enet_socket_send(ENetSocket, const ENetAddress*, const ENetBuffer*, size_t);
  694. ENET_API int enet_socket_receive(ENetSocket, ENetAddress*, ENetBuffer*, size_t);
  695. ENET_API int enet_socket_wait(ENetSocket, enet_uint32*, enet_uint64);
  696. ENET_API int enet_socket_set_option(ENetSocket, ENetSocketOption, int);
  697. ENET_API int enet_socket_get_option(ENetSocket, ENetSocketOption, int*);
  698. ENET_API int enet_socket_shutdown(ENetSocket, ENetSocketShutdown);
  699. ENET_API void enet_socket_destroy(ENetSocket);
  700. ENET_API int enet_socket_set_select(ENetSocket, ENetSocketSet*, ENetSocketSet*, enet_uint32);
  701. /* Extended API for easier binding in other programming languages */
  702. ENET_API void* enet_packet_get_data(const ENetPacket*);
  703. ENET_API int enet_packet_get_length(const ENetPacket*);
  704. ENET_API void enet_packet_set_free_callback(ENetPacket*, const void*);
  705. ENET_API int enet_packet_check_references(const ENetPacket*);
  706. ENET_API void enet_packet_dispose(ENetPacket*);
  707. ENET_API enet_uint32 enet_host_get_peers_count(const ENetHost*);
  708. ENET_API enet_uint32 enet_host_get_packets_sent(const ENetHost*);
  709. ENET_API enet_uint32 enet_host_get_packets_received(const ENetHost*);
  710. ENET_API enet_uint32 enet_host_get_bytes_sent(const ENetHost*);
  711. ENET_API enet_uint32 enet_host_get_bytes_received(const ENetHost*);
  712. ENET_API enet_uint32 enet_peer_get_id(const ENetPeer*);
  713. ENET_API int enet_peer_get_ip(const ENetPeer*, char*, size_t);
  714. ENET_API enet_uint16 enet_peer_get_port(const ENetPeer*);
  715. ENET_API enet_uint32 enet_peer_get_mtu(const ENetPeer*);
  716. ENET_API ENetPeerState enet_peer_get_state(const ENetPeer*);
  717. ENET_API enet_uint32 enet_peer_get_rtt(const ENetPeer*);
  718. ENET_API enet_uint32 enet_peer_get_lastsendtime(const ENetPeer*);
  719. ENET_API enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer*);
  720. ENET_API enet_uint64 enet_peer_get_packets_sent(const ENetPeer*);
  721. ENET_API enet_uint64 enet_peer_get_packets_lost(const ENetPeer*);
  722. ENET_API enet_uint64 enet_peer_get_bytes_sent(const ENetPeer*);
  723. ENET_API enet_uint64 enet_peer_get_bytes_received(const ENetPeer*);
  724. ENET_API void* enet_peer_get_data(const ENetPeer*);
  725. ENET_API void enet_peer_set_data(ENetPeer*, const void*);
  726. /*
  727. =======================================================================
  728. Private API
  729. =======================================================================
  730. */
  731. extern void enet_host_bandwidth_throttle(ENetHost*);
  732. extern enet_uint64 enet_host_random_seed(void);
  733. extern int enet_peer_throttle(ENetPeer*, enet_uint32);
  734. extern void enet_peer_reset_queues(ENetPeer*);
  735. extern void enet_peer_setup_outgoing_command(ENetPeer*, ENetOutgoingCommand*);
  736. extern ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer*, const ENetProtocol*, ENetPacket*, enet_uint32, enet_uint16);
  737. extern ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer*, const ENetProtocol*, const void*, size_t, enet_uint32, enet_uint32);
  738. extern ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer*, const ENetProtocol*, enet_uint16);
  739. extern void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer*, ENetChannel*);
  740. extern void enet_peer_dispatch_incoming_reliable_commands(ENetPeer*, ENetChannel*);
  741. extern void enet_peer_on_connect(ENetPeer*);
  742. extern void enet_peer_on_disconnect(ENetPeer*);
  743. extern size_t enet_protocol_command_size(enet_uint8);
  744. #ifdef __cplusplus
  745. }
  746. #endif
  747. #if defined(ENET_IMPLEMENTATION) && !defined(ENET_IMPLEMENTATION_DONE)
  748. #define ENET_IMPLEMENTATION_DONE 1
  749. #ifdef __cplusplus
  750. extern "C" {
  751. #endif
  752. #ifdef ENET_LZ4
  753. #include "lz4/lz4.h"
  754. #endif
  755. #ifdef __MINGW32__
  756. #include "mingw/inet_ntop.c"
  757. #include "mingw/inet_pton.c"
  758. #endif
  759. /*
  760. =======================================================================
  761. Atomics
  762. =======================================================================
  763. */
  764. #ifdef _MSC_VER
  765. #define ENET_AT_CASSERT_PRED(predicate) sizeof(char[2 * !!(predicate) - 1])
  766. #define ENET_IS_SUPPORTED_ATOMIC(size) ENET_AT_CASSERT_PRED(size == 1 || size == 2 || size == 4 || size == 8)
  767. #define ENET_ATOMIC_SIZEOF(variable) (ENET_IS_SUPPORTED_ATOMIC(sizeof(*(variable))), sizeof(*(variable)))
  768. __inline int64_t enet_at_atomic_read(char* ptr, size_t size) {
  769. switch (size) {
  770. case 1:
  771. return _InterlockedExchangeAdd8((volatile char*)ptr, 0);
  772. case 2:
  773. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, 0);
  774. case 4:
  775. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  776. return InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  777. #else
  778. return _InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  779. #endif
  780. case 8:
  781. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  782. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  783. #else
  784. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  785. #endif
  786. default:
  787. return 0x0;
  788. }
  789. }
  790. __inline int64_t enet_at_atomic_write(char* ptr, int64_t value, size_t size) {
  791. switch (size) {
  792. case 1:
  793. return _InterlockedExchange8((volatile char*)ptr, (char)value);
  794. case 2:
  795. return _InterlockedExchange16((volatile SHORT*)ptr, (SHORT)value);
  796. case 4:
  797. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  798. return InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  799. #else
  800. return _InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  801. #endif
  802. case 8:
  803. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  804. return InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  805. #else
  806. return _InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  807. #endif
  808. default:
  809. return 0x0;
  810. }
  811. }
  812. __inline int64_t enet_at_atomic_cas(char* ptr, int64_t new_val, int64_t old_val, size_t size) {
  813. switch (size) {
  814. case 1:
  815. return _InterlockedCompareExchange8((volatile char*)ptr, (char)new_val, (char)old_val);
  816. case 2:
  817. return _InterlockedCompareExchange16((volatile SHORT*)ptr, (SHORT)new_val, (SHORT)old_val);
  818. case 4:
  819. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  820. return InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  821. #else
  822. return _InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  823. #endif
  824. case 8:
  825. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  826. return InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  827. #else
  828. return _InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  829. #endif
  830. default:
  831. return 0x0;
  832. }
  833. }
  834. __inline int64_t enet_at_atomic_inc(char* ptr, int64_t delta, size_t data_size) {
  835. switch (data_size) {
  836. case 1:
  837. return _InterlockedExchangeAdd8((volatile char*)ptr, (char)delta);
  838. case 2:
  839. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, (SHORT)delta);
  840. case 4:
  841. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  842. return InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  843. #else
  844. return _InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  845. #endif
  846. case 8:
  847. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  848. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  849. #else
  850. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  851. #endif
  852. default:
  853. return 0x0;
  854. }
  855. }
  856. #define ENET_ATOMIC_READ(variable) enet_at_atomic_read((char*)(variable), ENET_ATOMIC_SIZEOF(variable))
  857. #define ENET_ATOMIC_WRITE(variable, new_val) enet_at_atomic_write((char*)(variable), (int64_t)(new_val), ENET_ATOMIC_SIZEOF(variable))
  858. #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))
  859. #define ENET_ATOMIC_INC(variable) enet_at_atomic_inc((char*)(variable), 1, ENET_ATOMIC_SIZEOF(variable))
  860. #define ENET_ATOMIC_DEC(variable) enet_at_atomic_inc((char*)(variable), -1, ENET_ATOMIC_SIZEOF(variable))
  861. #define ENET_ATOMIC_INC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), (delta), ENET_ATOMIC_SIZEOF(variable))
  862. #define ENET_ATOMIC_DEC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), -(delta), ENET_ATOMIC_SIZEOF(variable))
  863. #elif defined(__GNUC__) || defined(__clang__)
  864. #if defined(__clang__) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
  865. #define AT_HAVE_ATOMICS
  866. #endif
  867. /* We want to use __atomic built-ins if possible because the __sync primitives are
  868. deprecated, because the __atomic build-ins allow us to use ENET_ATOMIC_WRITE on
  869. uninitialized memory without running into undefined behavior, and because the
  870. __atomic versions generate more efficient code since we don't need to rely on
  871. CAS when we don't actually want it.
  872. Note that we use acquire-release memory order (like mutexes do). We could use
  873. sequentially consistent memory order but that has lower performance and is
  874. almost always unneeded. */
  875. #ifdef AT_HAVE_ATOMICS
  876. #define ENET_ATOMIC_READ(ptr) __atomic_load_n((ptr), __ATOMIC_ACQUIRE)
  877. #define ENET_ATOMIC_WRITE(ptr, value) __atomic_store_n((ptr), (value), __ATOMIC_RELEASE)
  878. #ifndef typeof
  879. #define typeof __typeof__
  880. #endif
  881. /* clang_analyzer doesn't know that CAS writes to memory so it complains about
  882. potentially lost data. Replace the code with the equivalent non-sync code. */
  883. #ifdef __clang_analyzer__
  884. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  885. ({ \
  886. typeof(*(ptr)) ENET_ATOMIC_CAS_old_actual_ = (*(ptr)); \
  887. if (ATOMIC_CAS_old_actual_ == (old_value)) \
  888. *(ptr) = new_value; \
  889. ENET_ATOMIC_CAS_old_actual_; \
  890. })
  891. #else
  892. /* Could use __auto_type instead of typeof but that shouldn't work in C++.
  893. The ({ }) syntax is a GCC extension called statement expression. It lets
  894. us return a value out of the macro.
  895. TODO We should return bool here instead of the old value to avoid the ABA
  896. problem. */
  897. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  898. ({ \
  899. typeof(*(ptr)) ENET_ATOMIC_CAS_expected_ = (old_value); \
  900. __atomic_compare_exchange_n((ptr), &ENET_ATOMIC_CAS_expected_, (new_value), false, \
  901. __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE); \
  902. ENET_ATOMIC_CAS_expected_; \
  903. })
  904. #endif
  905. #define ENET_ATOMIC_INC(ptr) __atomic_fetch_add((ptr), 1, __ATOMIC_ACQ_REL)
  906. #define ENET_ATOMIC_DEC(ptr) __atomic_fetch_sub((ptr), 1, __ATOMIC_ACQ_REL)
  907. #define ENET_ATOMIC_INC_BY(ptr, delta) __atomic_fetch_add((ptr), (delta), __ATOMIC_ACQ_REL)
  908. #define ENET_ATOMIC_DEC_BY(ptr, delta) __atomic_fetch_sub((ptr), (delta), __ATOMIC_ACQ_REL)
  909. #else
  910. #define ENET_ATOMIC_READ(variable) __sync_fetch_and_add(variable, 0)
  911. #define ENET_ATOMIC_WRITE(variable, new_val) (void)__sync_val_compare_and_swap((variable), *(variable), (new_val))
  912. #define ENET_ATOMIC_CAS(variable, old_value, new_val) __sync_val_compare_and_swap((variable), (old_value), (new_val))
  913. #define ENET_ATOMIC_INC(variable) __sync_fetch_and_add((variable), 1)
  914. #define ENET_ATOMIC_DEC(variable) __sync_fetch_and_sub((variable), 1)
  915. #define ENET_ATOMIC_INC_BY(variable, delta) __sync_fetch_and_add((variable), (delta), 1)
  916. #define ENET_ATOMIC_DEC_BY(variable, delta) __sync_fetch_and_sub((variable), (delta), 1)
  917. #endif
  918. #undef AT_HAVE_ATOMICS
  919. #endif
  920. /*
  921. =======================================================================
  922. Callbacks
  923. =======================================================================
  924. */
  925. static ENetCallbacks callbacks = {
  926. malloc,
  927. free,
  928. abort
  929. };
  930. int enet_initialize_with_callbacks(ENetVersion version, const ENetCallbacks* inits) {
  931. if (version < ENET_VERSION_CREATE(1, 3, 0))
  932. return -1;
  933. if (inits->malloc != NULL || inits->free != NULL) {
  934. if (inits->malloc == NULL || inits->free == NULL)
  935. return -1;
  936. callbacks.malloc = inits->malloc;
  937. callbacks.free = inits->free;
  938. }
  939. if (inits->noMemory != NULL)
  940. callbacks.noMemory = inits->noMemory;
  941. return enet_initialize();
  942. }
  943. void* enet_malloc(size_t size) {
  944. void* memory = callbacks.malloc(size);
  945. if (memory == NULL)
  946. callbacks.noMemory();
  947. return memory;
  948. }
  949. void enet_free(void* memory) {
  950. callbacks.free(memory);
  951. }
  952. /*
  953. =======================================================================
  954. List
  955. =======================================================================
  956. */
  957. void enet_list_clear(ENetList* list) {
  958. list->sentinel.next = &list->sentinel;
  959. list->sentinel.previous = &list->sentinel;
  960. }
  961. ENetListIterator enet_list_insert(ENetListIterator position, void* data) {
  962. ENetListIterator result = (ENetListIterator)data;
  963. result->previous = position->previous;
  964. result->next = position;
  965. result->previous->next = result;
  966. position->previous = result;
  967. return result;
  968. }
  969. void* enet_list_remove(ENetListIterator position) {
  970. position->previous->next = position->next;
  971. position->next->previous = position->previous;
  972. return position;
  973. }
  974. ENetListIterator enet_list_move(ENetListIterator position, void* dataFirst, void* dataLast) {
  975. ENetListIterator first = (ENetListIterator)dataFirst;
  976. ENetListIterator last = (ENetListIterator)dataLast;
  977. first->previous->next = last->next;
  978. last->next->previous = first->previous;
  979. first->previous = position->previous;
  980. last->next = position;
  981. first->previous->next = first;
  982. position->previous = last;
  983. return first;
  984. }
  985. size_t enet_list_size(ENetList* list) {
  986. size_t size = 0;
  987. ENetListIterator position;
  988. for (position = enet_list_begin(list); position != enet_list_end(list); position = enet_list_next(position)) {
  989. ++size;
  990. }
  991. return size;
  992. }
  993. /*
  994. =======================================================================
  995. Utilities
  996. =======================================================================
  997. */
  998. ENetVersion enet_linked_version(void) {
  999. return ENET_VERSION;
  1000. }
  1001. int enet_array_is_zeroed(const uint8_t* array, int length) {
  1002. size_t i;
  1003. for (i = 0; i < length; i++) {
  1004. if (array[i] != 0)
  1005. return -1;
  1006. }
  1007. return 0;
  1008. }
  1009. size_t enet_string_copy(char* destination, const char* source, size_t length) {
  1010. char *d = destination;
  1011. const char *s = source;
  1012. size_t n = length;
  1013. if (n != 0 && --n != 0) {
  1014. do {
  1015. if ((*d++ = *s++) == 0)
  1016. break;
  1017. }
  1018. while (--n != 0);
  1019. }
  1020. if (n == 0) {
  1021. if (length != 0)
  1022. *d = '\0';
  1023. while (*s++);
  1024. }
  1025. return (s - source - 1);
  1026. }
  1027. /*
  1028. =======================================================================
  1029. Time
  1030. =======================================================================
  1031. */
  1032. #ifdef _WIN32
  1033. static LARGE_INTEGER gettime_offset(void) {
  1034. SYSTEMTIME s;
  1035. FILETIME f;
  1036. LARGE_INTEGER t;
  1037. s.wYear = 1970;
  1038. s.wMonth = 1;
  1039. s.wDay = 1;
  1040. s.wHour = 0;
  1041. s.wMinute = 0;
  1042. s.wSecond = 0;
  1043. s.wMilliseconds = 0;
  1044. SystemTimeToFileTime(&s, &f);
  1045. t.QuadPart = f.dwHighDateTime;
  1046. t.QuadPart <<= 32;
  1047. t.QuadPart |= f.dwLowDateTime;
  1048. return t;
  1049. }
  1050. int clock_gettime(int X, struct timespec* tv) {
  1051. LARGE_INTEGER t;
  1052. FILETIME f;
  1053. double microseconds;
  1054. static LARGE_INTEGER offset;
  1055. static double frequencyToMicroseconds;
  1056. static int initialized = 0;
  1057. static BOOL usePerformanceCounter = 0;
  1058. if (!initialized) {
  1059. LARGE_INTEGER performanceFrequency;
  1060. initialized = 1;
  1061. usePerformanceCounter = QueryPerformanceFrequency(&performanceFrequency);
  1062. if (usePerformanceCounter) {
  1063. QueryPerformanceCounter(&offset);
  1064. frequencyToMicroseconds = (double)performanceFrequency.QuadPart / 1000000.;
  1065. } else {
  1066. offset = gettime_offset();
  1067. frequencyToMicroseconds = 10.;
  1068. }
  1069. }
  1070. if (usePerformanceCounter) {
  1071. QueryPerformanceCounter(&t);
  1072. } else {
  1073. GetSystemTimeAsFileTime(&f);
  1074. t.QuadPart = f.dwHighDateTime;
  1075. t.QuadPart <<= 32;
  1076. t.QuadPart |= f.dwLowDateTime;
  1077. }
  1078. t.QuadPart -= offset.QuadPart;
  1079. microseconds = (double)t.QuadPart / frequencyToMicroseconds;
  1080. t.QuadPart = (LONGLONG)microseconds;
  1081. tv->tv_sec = (long)(t.QuadPart / 1000000);
  1082. tv->tv_nsec = t.QuadPart % 1000000 * 1000;
  1083. return 0;
  1084. }
  1085. #elif __APPLE__ && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 && !defined(CLOCK_MONOTONIC)
  1086. #define CLOCK_MONOTONIC 0
  1087. int clock_gettime(int X, struct timespec* ts) {
  1088. clock_serv_t cclock;
  1089. mach_timespec_t mts;
  1090. host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
  1091. clock_get_time(cclock, &mts);
  1092. mach_port_deallocate(mach_task_self(), cclock);
  1093. ts->tv_sec = mts.tv_sec;
  1094. ts->tv_nsec = mts.tv_nsec;
  1095. return 0;
  1096. }
  1097. #endif
  1098. enet_uint32 enet_time_get(void) {
  1099. static enet_uint64 start_time_ns = 0;
  1100. struct timespec ts;
  1101. #ifdef CLOCK_MONOTONIC_RAW
  1102. clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
  1103. #else
  1104. clock_gettime(CLOCK_MONOTONIC, &ts);
  1105. #endif
  1106. static const enet_uint64 ns_in_s = 1000 * 1000 * 1000;
  1107. static const enet_uint64 ns_in_ms = 1000 * 1000;
  1108. enet_uint64 current_time_ns = ts.tv_nsec + (enet_uint64)ts.tv_sec * ns_in_s;
  1109. enet_uint64 offset_ns = ENET_ATOMIC_READ(&start_time_ns);
  1110. if (offset_ns == 0) {
  1111. enet_uint64 want_value = current_time_ns - 1 * ns_in_ms;
  1112. enet_uint64 old_value = ENET_ATOMIC_CAS(&start_time_ns, 0, want_value);
  1113. offset_ns = old_value == 0 ? want_value : old_value;
  1114. }
  1115. enet_uint64 result_in_ns = current_time_ns - offset_ns;
  1116. return (enet_uint32)(result_in_ns / ns_in_ms);
  1117. }
  1118. /*
  1119. =======================================================================
  1120. Checksum
  1121. =======================================================================
  1122. */
  1123. static int initializedCRC32 = 0;
  1124. static enet_uint32 crcTable[256];
  1125. static enet_uint32 reflect_crc(int val, int bits) {
  1126. int result = 0, bit;
  1127. for (bit = 0; bit < bits; bit++) {
  1128. if (val & 1)
  1129. result |= 1 << (bits - 1 - bit);
  1130. val >>= 1;
  1131. }
  1132. return result;
  1133. }
  1134. static void initialize_crc32(void) {
  1135. int byte;
  1136. for (byte = 0; byte < 256; ++byte) {
  1137. enet_uint32 crc = reflect_crc(byte, 8) << 24;
  1138. int offset;
  1139. for (offset = 0; offset < 8; ++offset) {
  1140. if (crc & 0x80000000)
  1141. crc = (crc << 1) ^ 0x04c11db7;
  1142. else
  1143. crc <<= 1;
  1144. }
  1145. crcTable[byte] = reflect_crc(crc, 32);
  1146. }
  1147. initializedCRC32 = 1;
  1148. }
  1149. enet_uint32 enet_crc32(const ENetBuffer* buffers, size_t bufferCount) {
  1150. enet_uint32 crc = 0xFFFFFFFF;
  1151. if (!initializedCRC32)
  1152. initialize_crc32();
  1153. while (bufferCount-- > 0) {
  1154. const enet_uint8* data = (const enet_uint8*)buffers->data;
  1155. const enet_uint8* dataEnd = &data[buffers->dataLength];
  1156. while (data < dataEnd) {
  1157. crc = (crc >> 8) ^ crcTable[(crc & 0xFF)^* data++];
  1158. }
  1159. ++buffers;
  1160. }
  1161. return ENET_HOST_TO_NET_32(~crc);
  1162. }
  1163. /*
  1164. =======================================================================
  1165. Packet
  1166. =======================================================================
  1167. */
  1168. ENetPacket* enet_packet_create(const void* data, size_t dataLength, enet_uint32 flags) {
  1169. ENetPacket* packet;
  1170. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1171. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1172. if (packet == NULL)
  1173. return NULL;
  1174. packet->data = (enet_uint8*)data;
  1175. } else {
  1176. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength);
  1177. if (packet == NULL)
  1178. return NULL;
  1179. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1180. if (data != NULL)
  1181. memcpy(packet->data, data, dataLength);
  1182. }
  1183. packet->referenceCount = 0;
  1184. packet->flags = flags;
  1185. packet->dataLength = dataLength;
  1186. packet->freeCallback = NULL;
  1187. return packet;
  1188. }
  1189. ENetPacket* enet_packet_create_offset(const void* data, size_t dataLength, size_t dataOffset, enet_uint32 flags) {
  1190. ENetPacket* packet;
  1191. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1192. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1193. if (packet == NULL)
  1194. return NULL;
  1195. packet->data = (enet_uint8*)data;
  1196. } else {
  1197. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength - dataOffset);
  1198. if (packet == NULL)
  1199. return NULL;
  1200. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1201. if (data != NULL)
  1202. memcpy(packet->data, (char*)data + dataOffset, dataLength - dataOffset);
  1203. }
  1204. packet->referenceCount = 0;
  1205. packet->flags = flags;
  1206. packet->dataLength = dataLength - dataOffset;
  1207. packet->freeCallback = NULL;
  1208. return packet;
  1209. }
  1210. void enet_packet_destroy(ENetPacket* packet) {
  1211. if (packet == NULL)
  1212. return;
  1213. if (packet->freeCallback != NULL)
  1214. (*packet->freeCallback)((void*)packet);
  1215. enet_free(packet);
  1216. }
  1217. /*
  1218. =======================================================================
  1219. Protocol
  1220. =======================================================================
  1221. */
  1222. static size_t commandSizes[ENET_PROTOCOL_COMMAND_COUNT] = {
  1223. 0,
  1224. sizeof(ENetProtocolAcknowledge),
  1225. sizeof(ENetProtocolConnect),
  1226. sizeof(ENetProtocolVerifyConnect),
  1227. sizeof(ENetProtocolDisconnect),
  1228. sizeof(ENetProtocolPing),
  1229. sizeof(ENetProtocolSendReliable),
  1230. sizeof(ENetProtocolSendUnreliable),
  1231. sizeof(ENetProtocolSendFragment),
  1232. sizeof(ENetProtocolSendUnsequenced),
  1233. sizeof(ENetProtocolBandwidthLimit),
  1234. sizeof(ENetProtocolThrottleConfigure),
  1235. sizeof(ENetProtocolSendFragment)
  1236. };
  1237. size_t enet_protocol_command_size(enet_uint8 commandNumber) {
  1238. return commandSizes[commandNumber & ENET_PROTOCOL_COMMAND_MASK];
  1239. }
  1240. static void enet_protocol_change_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1241. if (state == ENET_PEER_STATE_CONNECTED || state == ENET_PEER_STATE_DISCONNECT_LATER)
  1242. enet_peer_on_connect(peer);
  1243. else
  1244. enet_peer_on_disconnect(peer);
  1245. peer->state = state;
  1246. }
  1247. static void enet_protocol_dispatch_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1248. enet_protocol_change_state(host, peer, state);
  1249. if (!peer->needsDispatch) {
  1250. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1251. peer->needsDispatch = 1;
  1252. }
  1253. }
  1254. static int enet_protocol_dispatch_incoming_commands(ENetHost* host, ENetEvent* event) {
  1255. while (!enet_list_empty(&host->dispatchQueue)) {
  1256. ENetPeer* peer = (ENetPeer*)enet_list_remove(enet_list_begin(&host->dispatchQueue));
  1257. peer->needsDispatch = 0;
  1258. switch (peer->state) {
  1259. case ENET_PEER_STATE_CONNECTION_PENDING:
  1260. case ENET_PEER_STATE_CONNECTION_SUCCEEDED:
  1261. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1262. event->type = ENET_EVENT_TYPE_CONNECT;
  1263. event->peer = peer;
  1264. event->data = peer->eventData;
  1265. return 1;
  1266. case ENET_PEER_STATE_ZOMBIE:
  1267. host->recalculateBandwidthLimits = 1;
  1268. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1269. event->peer = peer;
  1270. event->data = peer->eventData;
  1271. enet_peer_reset(peer);
  1272. return 1;
  1273. case ENET_PEER_STATE_CONNECTED:
  1274. if (enet_list_empty(&peer->dispatchedCommands))
  1275. continue;
  1276. event->packet = enet_peer_receive(peer, &event->channelID);
  1277. if (event->packet == NULL)
  1278. continue;
  1279. event->type = ENET_EVENT_TYPE_RECEIVE;
  1280. event->peer = peer;
  1281. if (!enet_list_empty(&peer->dispatchedCommands)) {
  1282. peer->needsDispatch = 1;
  1283. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1284. }
  1285. return 1;
  1286. default:
  1287. break;
  1288. }
  1289. }
  1290. return 0;
  1291. }
  1292. static void enet_protocol_notify_connect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1293. host->recalculateBandwidthLimits = 1;
  1294. if (event != NULL) {
  1295. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1296. peer->totalDataSent = 0;
  1297. peer->totalDataReceived = 0;
  1298. peer->totalPacketsSent = 0;
  1299. peer->totalPacketsLost = 0;
  1300. event->type = ENET_EVENT_TYPE_CONNECT;
  1301. event->peer = peer;
  1302. event->data = peer->eventData;
  1303. } else {
  1304. enet_protocol_dispatch_state(host, peer, peer->state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING);
  1305. }
  1306. }
  1307. static void enet_protocol_notify_disconnect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1308. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1309. host->recalculateBandwidthLimits = 1;
  1310. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1311. enet_peer_reset(peer);
  1312. } else if (event != NULL) {
  1313. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1314. event->peer = peer;
  1315. event->data = 0;
  1316. enet_peer_reset(peer);
  1317. } else {
  1318. peer->eventData = 0;
  1319. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1320. }
  1321. }
  1322. static void enet_protocol_notify_disconnect_timeout(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1323. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1324. host->recalculateBandwidthLimits = 1;
  1325. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1326. enet_peer_reset(peer);
  1327. } else if (event != NULL) {
  1328. event->type = ENET_EVENT_TYPE_DISCONNECT_TIMEOUT;
  1329. event->peer = peer;
  1330. event->data = 0;
  1331. enet_peer_reset(peer);
  1332. } else {
  1333. peer->eventData = 0;
  1334. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1335. }
  1336. }
  1337. static void enet_protocol_remove_sent_unreliable_commands(ENetPeer* peer) {
  1338. ENetOutgoingCommand* outgoingCommand;
  1339. if (enet_list_empty(&peer->sentUnreliableCommands))
  1340. return;
  1341. do {
  1342. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentUnreliableCommands);
  1343. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1344. if (outgoingCommand->packet != NULL) {
  1345. --outgoingCommand->packet->referenceCount;
  1346. if (outgoingCommand->packet->referenceCount == 0) {
  1347. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1348. enet_packet_destroy(outgoingCommand->packet);
  1349. }
  1350. }
  1351. enet_free(outgoingCommand);
  1352. }
  1353. while (!enet_list_empty(&peer->sentUnreliableCommands));
  1354. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1355. enet_peer_disconnect(peer, peer->eventData);
  1356. }
  1357. static ENetProtocolCommand enet_protocol_remove_sent_reliable_command(ENetPeer* peer, enet_uint16 reliableSequenceNumber, enet_uint8 channelID) {
  1358. ENetOutgoingCommand* outgoingCommand = NULL;
  1359. ENetListIterator currentCommand;
  1360. ENetProtocolCommand commandNumber;
  1361. int wasSent = 1;
  1362. for (currentCommand = enet_list_begin(&peer->sentReliableCommands); currentCommand != enet_list_end(&peer->sentReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1363. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1364. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1365. break;
  1366. }
  1367. if (currentCommand == enet_list_end(&peer->sentReliableCommands)) {
  1368. for (currentCommand = enet_list_begin(&peer->outgoingReliableCommands); currentCommand != enet_list_end(&peer->outgoingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1369. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1370. if (outgoingCommand->sendAttempts < 1)
  1371. return ENET_PROTOCOL_COMMAND_NONE;
  1372. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1373. break;
  1374. }
  1375. if (currentCommand == enet_list_end(&peer->outgoingReliableCommands))
  1376. return ENET_PROTOCOL_COMMAND_NONE;
  1377. wasSent = 0;
  1378. }
  1379. if (outgoingCommand == NULL)
  1380. return ENET_PROTOCOL_COMMAND_NONE;
  1381. if (channelID < peer->channelCount) {
  1382. ENetChannel* channel = &peer->channels[channelID];
  1383. enet_uint16 reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1384. if (channel->reliableWindows[reliableWindow] > 0) {
  1385. --channel->reliableWindows[reliableWindow];
  1386. if (!channel->reliableWindows[reliableWindow])
  1387. channel->usedReliableWindows &= ~(1 << reliableWindow);
  1388. }
  1389. }
  1390. commandNumber = (ENetProtocolCommand)(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK);
  1391. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1392. if (outgoingCommand->packet != NULL) {
  1393. if (wasSent)
  1394. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  1395. --outgoingCommand->packet->referenceCount;
  1396. if (outgoingCommand->packet->referenceCount == 0) {
  1397. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1398. enet_packet_destroy(outgoingCommand->packet);
  1399. }
  1400. }
  1401. enet_free(outgoingCommand);
  1402. if (enet_list_empty(&peer->sentReliableCommands))
  1403. return commandNumber;
  1404. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentReliableCommands);
  1405. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  1406. return commandNumber;
  1407. }
  1408. static ENetPeer* enet_protocol_handle_connect(ENetHost* host, ENetProtocolHeader* header, ENetProtocol* command) {
  1409. enet_uint8 incomingSessionID, outgoingSessionID;
  1410. enet_uint32 mtu, windowSize;
  1411. ENetChannel* channel;
  1412. size_t channelCount, duplicatePeers = 0;
  1413. ENetPeer* currentPeer, *peer = NULL;
  1414. ENetProtocol verifyCommand;
  1415. channelCount = ENET_NET_TO_HOST_32(command->connect.channelCount);
  1416. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  1417. return NULL;
  1418. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  1419. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED) {
  1420. if (peer == NULL)
  1421. peer = currentPeer;
  1422. } else if (currentPeer->state != ENET_PEER_STATE_CONNECTING && in6_equal(currentPeer->address.ipv6, host->receivedAddress.ipv6)) {
  1423. if (currentPeer->address.port == host->receivedAddress.port && currentPeer->connectID == command->connect.connectID)
  1424. return NULL;
  1425. ++duplicatePeers;
  1426. }
  1427. }
  1428. if (peer == NULL || duplicatePeers >= host->duplicatePeers)
  1429. return NULL;
  1430. if (channelCount > host->channelLimit)
  1431. channelCount = host->channelLimit;
  1432. peer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  1433. if (peer->channels == NULL)
  1434. return NULL;
  1435. peer->channelCount = channelCount;
  1436. peer->state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
  1437. peer->connectID = command->connect.connectID;
  1438. peer->address = host->receivedAddress;
  1439. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->connect.outgoingPeerID);
  1440. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->connect.incomingBandwidth);
  1441. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->connect.outgoingBandwidth);
  1442. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->connect.packetThrottleInterval);
  1443. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleAcceleration);
  1444. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleDeceleration);
  1445. peer->eventData = ENET_NET_TO_HOST_32(command->connect.data);
  1446. incomingSessionID = command->connect.incomingSessionID == 0xFF ? peer->outgoingSessionID : command->connect.incomingSessionID;
  1447. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1448. if (incomingSessionID == peer->outgoingSessionID)
  1449. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1450. peer->outgoingSessionID = incomingSessionID;
  1451. outgoingSessionID = command->connect.outgoingSessionID == 0xFF ? peer->incomingSessionID : command->connect.outgoingSessionID;
  1452. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1453. if (outgoingSessionID == peer->incomingSessionID)
  1454. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1455. peer->incomingSessionID = outgoingSessionID;
  1456. for (channel = peer->channels; channel < &peer->channels[channelCount]; ++channel) {
  1457. channel->outgoingReliableSequenceNumber = 0;
  1458. channel->outgoingUnreliableSequenceNumber = 0;
  1459. channel->incomingReliableSequenceNumber = 0;
  1460. channel->incomingUnreliableSequenceNumber = 0;
  1461. enet_list_clear(&channel->incomingReliableCommands);
  1462. enet_list_clear(&channel->incomingUnreliableCommands);
  1463. channel->usedReliableWindows = 0;
  1464. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  1465. }
  1466. mtu = ENET_NET_TO_HOST_32(command->connect.mtu);
  1467. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1468. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1469. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1470. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1471. peer->mtu = mtu;
  1472. if (host->outgoingBandwidth == 0 && peer->incomingBandwidth == 0)
  1473. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1474. else if (host->outgoingBandwidth == 0 || peer->incomingBandwidth == 0)
  1475. peer->windowSize = (ENET_MAX(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1476. else
  1477. peer->windowSize = (ENET_MIN(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1478. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1479. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1480. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1481. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1482. if (host->incomingBandwidth == 0)
  1483. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1484. else
  1485. windowSize = (host->incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1486. if (windowSize > ENET_NET_TO_HOST_32(command->connect.windowSize))
  1487. windowSize = ENET_NET_TO_HOST_32(command->connect.windowSize);
  1488. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1489. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1490. else if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1491. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1492. verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  1493. verifyCommand.header.channelID = 0xFF;
  1494. verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16(peer->incomingPeerID);
  1495. verifyCommand.verifyConnect.incomingSessionID = incomingSessionID;
  1496. verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID;
  1497. verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_32(peer->mtu);
  1498. verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32(windowSize);
  1499. verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  1500. verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  1501. verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  1502. verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32(peer->packetThrottleInterval);
  1503. verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(peer->packetThrottleAcceleration);
  1504. verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(peer->packetThrottleDeceleration);
  1505. verifyCommand.verifyConnect.connectID = peer->connectID;
  1506. enet_peer_queue_outgoing_command(peer, &verifyCommand, NULL, 0, 0);
  1507. return peer;
  1508. }
  1509. static int enet_protocol_handle_send_reliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1510. size_t dataLength;
  1511. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1512. return -1;
  1513. dataLength = ENET_NET_TO_HOST_16(command->sendReliable.dataLength);
  1514. *currentData += dataLength;
  1515. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1516. return -1;
  1517. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendReliable), dataLength, ENET_PACKET_FLAG_RELIABLE, 0) == NULL)
  1518. return -1;
  1519. return 0;
  1520. }
  1521. static int enet_protocol_handle_send_unsequenced(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1522. enet_uint32 unsequencedGroup, index;
  1523. size_t dataLength;
  1524. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1525. return -1;
  1526. dataLength = ENET_NET_TO_HOST_16(command->sendUnsequenced.dataLength);
  1527. *currentData += dataLength;
  1528. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1529. return -1;
  1530. unsequencedGroup = ENET_NET_TO_HOST_16(command->sendUnsequenced.unsequencedGroup);
  1531. index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
  1532. if (unsequencedGroup < peer->incomingUnsequencedGroup)
  1533. unsequencedGroup += 0x10000;
  1534. if (unsequencedGroup >= (enet_uint32)peer->incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE)
  1535. return 0;
  1536. unsequencedGroup &= 0xFFFF;
  1537. if (unsequencedGroup - index != peer->incomingUnsequencedGroup) {
  1538. peer->incomingUnsequencedGroup = unsequencedGroup - index;
  1539. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  1540. } else if (peer->unsequencedWindow[index / 32] & (1 << (index % 32))) {
  1541. return 0;
  1542. }
  1543. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnsequenced), dataLength, ENET_PACKET_FLAG_UNSEQUENCED, 0) == NULL)
  1544. return -1;
  1545. peer->unsequencedWindow[index / 32] |= 1 << (index % 32);
  1546. return 0;
  1547. }
  1548. static int enet_protocol_handle_send_unreliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1549. size_t dataLength;
  1550. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1551. return -1;
  1552. dataLength = ENET_NET_TO_HOST_16(command->sendUnreliable.dataLength);
  1553. *currentData += dataLength;
  1554. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1555. return -1;
  1556. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnreliable), dataLength, 0, 0) == NULL)
  1557. return -1;
  1558. return 0;
  1559. }
  1560. static int enet_protocol_handle_send_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1561. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, startSequenceNumber, totalLength;
  1562. ENetChannel* channel;
  1563. enet_uint16 startWindow, currentWindow;
  1564. ENetListIterator currentCommand;
  1565. ENetIncomingCommand* startCommand = NULL;
  1566. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1567. return -1;
  1568. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1569. *currentData += fragmentLength;
  1570. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1571. return -1;
  1572. channel = &peer->channels[command->header.channelID];
  1573. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1574. startWindow = startSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1575. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1576. if (startSequenceNumber < channel->incomingReliableSequenceNumber)
  1577. startWindow += ENET_PEER_RELIABLE_WINDOWS;
  1578. if (startWindow < currentWindow || startWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1579. return 0;
  1580. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1581. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1582. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1583. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1584. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1585. return -1;
  1586. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1587. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1588. if (startSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1589. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1590. continue;
  1591. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1592. break;
  1593. }
  1594. if (incomingCommand->reliableSequenceNumber <= startSequenceNumber) {
  1595. if (incomingCommand->reliableSequenceNumber < startSequenceNumber)
  1596. break;
  1597. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1598. return -1;
  1599. startCommand = incomingCommand;
  1600. break;
  1601. }
  1602. }
  1603. if (startCommand == NULL) {
  1604. ENetProtocol hostCommand = *command;
  1605. hostCommand.header.reliableSequenceNumber = startSequenceNumber;
  1606. startCommand = enet_peer_queue_incoming_command(peer, &hostCommand, NULL, totalLength, ENET_PACKET_FLAG_RELIABLE, fragmentCount);
  1607. if (startCommand == NULL)
  1608. return -1;
  1609. }
  1610. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1611. --startCommand->fragmentsRemaining;
  1612. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1613. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1614. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1615. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1616. if (startCommand->fragmentsRemaining <= 0)
  1617. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  1618. }
  1619. return 0;
  1620. }
  1621. static int enet_protocol_handle_send_unreliable_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1622. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, reliableSequenceNumber, startSequenceNumber, totalLength;
  1623. enet_uint16 reliableWindow, currentWindow;
  1624. ENetChannel* channel;
  1625. ENetListIterator currentCommand;
  1626. ENetIncomingCommand* startCommand = NULL;
  1627. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1628. return -1;
  1629. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1630. *currentData += fragmentLength;
  1631. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1632. return -1;
  1633. channel = &peer->channels[command->header.channelID];
  1634. reliableSequenceNumber = command->header.reliableSequenceNumber;
  1635. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1636. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1637. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1638. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1639. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  1640. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1641. return 0;
  1642. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && startSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  1643. return 0;
  1644. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1645. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1646. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1647. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1648. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1649. return -1;
  1650. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1651. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1652. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1653. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1654. continue;
  1655. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1656. break;
  1657. }
  1658. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  1659. break;
  1660. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  1661. continue;
  1662. if (incomingCommand->unreliableSequenceNumber <= startSequenceNumber) {
  1663. if (incomingCommand->unreliableSequenceNumber < startSequenceNumber)
  1664. break;
  1665. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1666. return -1;
  1667. startCommand = incomingCommand;
  1668. break;
  1669. }
  1670. }
  1671. if (startCommand == NULL) {
  1672. startCommand = enet_peer_queue_incoming_command(peer, command, NULL, totalLength,
  1673. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED, fragmentCount);
  1674. if (startCommand == NULL)
  1675. return -1;
  1676. }
  1677. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1678. --startCommand->fragmentsRemaining;
  1679. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1680. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1681. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1682. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1683. if (startCommand->fragmentsRemaining <= 0)
  1684. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  1685. }
  1686. return 0;
  1687. }
  1688. static int enet_protocol_handle_ping(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1689. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1690. return -1;
  1691. return 0;
  1692. }
  1693. static int enet_protocol_handle_bandwidth_limit(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1694. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1695. return -1;
  1696. if (peer->incomingBandwidth != 0)
  1697. --host->bandwidthLimitedPeers;
  1698. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.incomingBandwidth);
  1699. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.outgoingBandwidth);
  1700. if (peer->incomingBandwidth != 0)
  1701. ++host->bandwidthLimitedPeers;
  1702. if (peer->incomingBandwidth == 0 && host->outgoingBandwidth == 0)
  1703. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1704. else if (peer->incomingBandwidth == 0 || host->outgoingBandwidth == 0)
  1705. peer->windowSize = (ENET_MAX(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1706. else
  1707. peer->windowSize = (ENET_MIN(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1708. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1709. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1710. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1711. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1712. return 0;
  1713. }
  1714. static int enet_protocol_handle_throttle_configure(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1715. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1716. return -1;
  1717. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleInterval);
  1718. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleAcceleration);
  1719. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleDeceleration);
  1720. return 0;
  1721. }
  1722. static int enet_protocol_handle_disconnect(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1723. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT)
  1724. return 0;
  1725. enet_peer_reset_queues(peer);
  1726. if (peer->state == ENET_PEER_STATE_CONNECTION_SUCCEEDED || peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_CONNECTING) {
  1727. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1728. } else if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1729. if (peer->state == ENET_PEER_STATE_CONNECTION_PENDING)
  1730. host->recalculateBandwidthLimits = 1;
  1731. enet_peer_reset(peer);
  1732. } else if (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  1733. enet_protocol_change_state(host, peer, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT);
  1734. } else {
  1735. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1736. }
  1737. if (peer->state != ENET_PEER_STATE_DISCONNECTED)
  1738. peer->eventData = ENET_NET_TO_HOST_32(command->disconnect.data);
  1739. return 0;
  1740. }
  1741. static int enet_protocol_handle_acknowledge(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1742. enet_uint32 roundTripTime, receivedSentTime, receivedReliableSequenceNumber;
  1743. ENetProtocolCommand commandNumber;
  1744. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE)
  1745. return 0;
  1746. receivedSentTime = ENET_NET_TO_HOST_16(command->acknowledge.receivedSentTime);
  1747. receivedSentTime |= host->serviceTime & 0xFFFF0000;
  1748. if ((receivedSentTime & 0x8000) > (host->serviceTime & 0x8000))
  1749. receivedSentTime -= 0x10000;
  1750. if (ENET_TIME_LESS(host->serviceTime, receivedSentTime))
  1751. return 0;
  1752. peer->lastReceiveTime = host->serviceTime;
  1753. peer->earliestTimeout = 0;
  1754. roundTripTime = ENET_TIME_DIFFERENCE(host->serviceTime, receivedSentTime);
  1755. if (roundTripTime == 0)
  1756. roundTripTime = 1;
  1757. if (peer->smoothedRoundTripTime == 0)
  1758. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * ENET_SRTT_INITIAL + ENET_SRTT_PARA_G * roundTripTime);
  1759. else
  1760. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * peer->smoothedRoundTripTime + ENET_SRTT_PARA_G * roundTripTime);
  1761. enet_peer_throttle(peer, peer->smoothedRoundTripTime);
  1762. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1763. if (peer->smoothedRoundTripTime >= peer->roundTripTime) {
  1764. peer->roundTripTime += (peer->smoothedRoundTripTime - peer->roundTripTime) / 8;
  1765. peer->roundTripTimeVariance += (peer->smoothedRoundTripTime - peer->roundTripTime) / 4;
  1766. } else {
  1767. peer->roundTripTime -= (peer->roundTripTime - peer->smoothedRoundTripTime) / 8;
  1768. peer->roundTripTimeVariance += (peer->roundTripTime - peer->smoothedRoundTripTime) / 4;
  1769. }
  1770. if (peer->roundTripTime < peer->lowestRoundTripTime)
  1771. peer->lowestRoundTripTime = peer->roundTripTime;
  1772. if (peer->roundTripTimeVariance > peer->highestRoundTripTimeVariance)
  1773. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1774. if (peer->packetThrottleEpoch == 0 || ENET_TIME_DIFFERENCE(host->serviceTime, peer->packetThrottleEpoch) >= peer->packetThrottleInterval) {
  1775. peer->lastRoundTripTime = peer->lowestRoundTripTime;
  1776. peer->lastRoundTripTimeVariance = peer->highestRoundTripTimeVariance;
  1777. peer->lowestRoundTripTime = peer->roundTripTime;
  1778. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1779. peer->packetThrottleEpoch = host->serviceTime;
  1780. }
  1781. receivedReliableSequenceNumber = ENET_NET_TO_HOST_16(command->acknowledge.receivedReliableSequenceNumber);
  1782. commandNumber = enet_protocol_remove_sent_reliable_command(peer, receivedReliableSequenceNumber, command->header.channelID);
  1783. switch (peer->state) {
  1784. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1785. if (commandNumber != ENET_PROTOCOL_COMMAND_VERIFY_CONNECT)
  1786. return -1;
  1787. enet_protocol_notify_connect(host, peer, event);
  1788. break;
  1789. case ENET_PEER_STATE_DISCONNECTING:
  1790. if (commandNumber != ENET_PROTOCOL_COMMAND_DISCONNECT)
  1791. return -1;
  1792. enet_protocol_notify_disconnect(host, peer, event);
  1793. break;
  1794. case ENET_PEER_STATE_DISCONNECT_LATER:
  1795. if (enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1796. enet_peer_disconnect(peer, peer->eventData);
  1797. break;
  1798. default:
  1799. break;
  1800. }
  1801. return 0;
  1802. }
  1803. static int enet_protocol_handle_verify_connect(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1804. enet_uint32 mtu, windowSize;
  1805. size_t channelCount;
  1806. if (peer->state != ENET_PEER_STATE_CONNECTING)
  1807. return 0;
  1808. channelCount = ENET_NET_TO_HOST_32(command->verifyConnect.channelCount);
  1809. 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) {
  1810. peer->eventData = 0;
  1811. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1812. return -1;
  1813. }
  1814. enet_protocol_remove_sent_reliable_command(peer, 1, 0xFF);
  1815. if (channelCount < peer->channelCount)
  1816. peer->channelCount = channelCount;
  1817. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->verifyConnect.outgoingPeerID);
  1818. peer->incomingSessionID = command->verifyConnect.incomingSessionID;
  1819. peer->outgoingSessionID = command->verifyConnect.outgoingSessionID;
  1820. mtu = ENET_NET_TO_HOST_32(command->verifyConnect.mtu);
  1821. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1822. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1823. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1824. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1825. if (mtu < peer->mtu)
  1826. peer->mtu = mtu;
  1827. windowSize = ENET_NET_TO_HOST_32(command->verifyConnect.windowSize);
  1828. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1829. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1830. if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1831. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1832. if (windowSize < peer->windowSize)
  1833. peer->windowSize = windowSize;
  1834. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.incomingBandwidth);
  1835. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.outgoingBandwidth);
  1836. enet_protocol_notify_connect(host, peer, event);
  1837. return 0;
  1838. }
  1839. static int enet_protocol_handle_incoming_commands(ENetHost* host, ENetEvent* event) {
  1840. ENetProtocolHeader* header;
  1841. ENetProtocol* command;
  1842. ENetPeer* peer;
  1843. enet_uint8* currentData;
  1844. size_t headerSize;
  1845. enet_uint16 peerID, flags;
  1846. enet_uint8 sessionID;
  1847. if (host->receivedDataLength < (size_t)&((ENetProtocolHeader*)0)->sentTime)
  1848. return 0;
  1849. header = (ENetProtocolHeader*)host->receivedData;
  1850. peerID = ENET_NET_TO_HOST_16(header->peerID);
  1851. sessionID = (peerID & ENET_PROTOCOL_HEADER_SESSION_MASK) >> ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  1852. flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK;
  1853. peerID &= ~(ENET_PROTOCOL_HEADER_FLAG_MASK | ENET_PROTOCOL_HEADER_SESSION_MASK);
  1854. headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof(ENetProtocolHeader) : (size_t)&((ENetProtocolHeader*)0)->sentTime);
  1855. if (host->checksumCallback != NULL)
  1856. headerSize += sizeof(enet_uint32);
  1857. if (peerID == ENET_PROTOCOL_MAXIMUM_PEER_ID) {
  1858. peer = NULL;
  1859. } else if (peerID >= host->peerCount) {
  1860. return 0;
  1861. } else {
  1862. peer = &host->peers[peerID];
  1863. 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))
  1864. return 0;
  1865. }
  1866. #ifdef ENET_LZ4
  1867. if (flags & ENET_PROTOCOL_HEADER_FLAG_COMPRESSED) {
  1868. size_t originalSize = LZ4_decompress_safe((const char*)host->receivedData + headerSize, (char*)host->packetData[1] + headerSize, host->receivedDataLength - headerSize, sizeof(host->packetData[1]) - headerSize);
  1869. if (originalSize <= 0 || originalSize > sizeof(host->packetData[1]) - headerSize)
  1870. return 0;
  1871. memcpy(host->packetData[1], header, headerSize);
  1872. host->receivedData = host->packetData[1];
  1873. host->receivedDataLength = headerSize + originalSize;
  1874. }
  1875. #endif
  1876. if (host->checksumCallback != NULL) {
  1877. enet_uint32* checksum = (enet_uint32*)&host->receivedData[headerSize - sizeof(enet_uint32)];
  1878. enet_uint32 desiredChecksum = *checksum;
  1879. ENetBuffer buffer;
  1880. *checksum = peer != NULL ? peer->connectID : 0;
  1881. buffer.data = host->receivedData;
  1882. buffer.dataLength = host->receivedDataLength;
  1883. if (host->checksumCallback(&buffer, 1) != desiredChecksum)
  1884. return 0;
  1885. }
  1886. if (peer != NULL) {
  1887. peer->address.ipv6 = host->receivedAddress.ipv6;
  1888. peer->address.port = host->receivedAddress.port;
  1889. peer->incomingDataTotal += host->receivedDataLength;
  1890. peer->totalDataReceived += host->receivedDataLength;
  1891. }
  1892. currentData = host->receivedData + headerSize;
  1893. while (currentData < &host->receivedData[host->receivedDataLength]) {
  1894. enet_uint8 commandNumber;
  1895. size_t commandSize;
  1896. command = (ENetProtocol*)currentData;
  1897. if (currentData + sizeof(ENetProtocolCommandHeader) > &host->receivedData[host->receivedDataLength])
  1898. break;
  1899. commandNumber = command->header.command & ENET_PROTOCOL_COMMAND_MASK;
  1900. if (commandNumber >= ENET_PROTOCOL_COMMAND_COUNT)
  1901. break;
  1902. commandSize = commandSizes[commandNumber];
  1903. if (commandSize == 0 || currentData + commandSize > &host->receivedData[host->receivedDataLength])
  1904. break;
  1905. currentData += commandSize;
  1906. if (peer == NULL && (commandNumber != ENET_PROTOCOL_COMMAND_CONNECT || currentData < &host->receivedData[host->receivedDataLength]))
  1907. break;
  1908. command->header.reliableSequenceNumber = ENET_NET_TO_HOST_16(command->header.reliableSequenceNumber);
  1909. switch (commandNumber) {
  1910. case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE:
  1911. if (enet_protocol_handle_acknowledge(host, event, peer, command))
  1912. goto commandError;
  1913. break;
  1914. case ENET_PROTOCOL_COMMAND_CONNECT:
  1915. if (peer != NULL)
  1916. goto commandError;
  1917. if (host->preventConnections == 0) {
  1918. peer = enet_protocol_handle_connect(host, header, command);
  1919. if (peer == NULL)
  1920. goto commandError;
  1921. }
  1922. break;
  1923. case ENET_PROTOCOL_COMMAND_VERIFY_CONNECT:
  1924. if (enet_protocol_handle_verify_connect(host, event, peer, command))
  1925. goto commandError;
  1926. break;
  1927. case ENET_PROTOCOL_COMMAND_DISCONNECT:
  1928. if (enet_protocol_handle_disconnect(host, peer, command))
  1929. goto commandError;
  1930. break;
  1931. case ENET_PROTOCOL_COMMAND_PING:
  1932. if (enet_protocol_handle_ping(host, peer, command))
  1933. goto commandError;
  1934. break;
  1935. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  1936. if (enet_protocol_handle_send_reliable(host, peer, command, &currentData))
  1937. goto commandError;
  1938. break;
  1939. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  1940. if (enet_protocol_handle_send_unreliable(host, peer, command, &currentData))
  1941. goto commandError;
  1942. break;
  1943. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  1944. if (enet_protocol_handle_send_unsequenced(host, peer, command, &currentData))
  1945. goto commandError;
  1946. break;
  1947. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  1948. if (enet_protocol_handle_send_fragment(host, peer, command, &currentData))
  1949. goto commandError;
  1950. break;
  1951. case ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT:
  1952. if (enet_protocol_handle_bandwidth_limit(host, peer, command))
  1953. goto commandError;
  1954. break;
  1955. case ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE:
  1956. if (enet_protocol_handle_throttle_configure(host, peer, command))
  1957. goto commandError;
  1958. break;
  1959. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  1960. if (enet_protocol_handle_send_unreliable_fragment(host, peer, command, &currentData))
  1961. goto commandError;
  1962. break;
  1963. default:
  1964. goto commandError;
  1965. }
  1966. if (peer != NULL && (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0) {
  1967. enet_uint16 sentTime;
  1968. if (!(flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME))
  1969. break;
  1970. sentTime = ENET_NET_TO_HOST_16(header->sentTime);
  1971. switch (peer->state) {
  1972. case ENET_PEER_STATE_DISCONNECTING:
  1973. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1974. case ENET_PEER_STATE_DISCONNECTED:
  1975. case ENET_PEER_STATE_ZOMBIE:
  1976. break;
  1977. case ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT:
  1978. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  1979. enet_peer_queue_acknowledgement(peer, command, sentTime);
  1980. break;
  1981. default:
  1982. enet_peer_queue_acknowledgement(peer, command, sentTime);
  1983. break;
  1984. }
  1985. }
  1986. }
  1987. commandError:
  1988. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  1989. return 1;
  1990. return 0;
  1991. }
  1992. static int enet_protocol_receive_incoming_commands(ENetHost* host, ENetEvent* event) {
  1993. int packets;
  1994. for (packets = 0; packets < 256; ++packets) {
  1995. int receivedLength;
  1996. ENetBuffer buffer;
  1997. buffer.data = host->packetData[0];
  1998. buffer.dataLength = host->mtu;
  1999. receivedLength = enet_socket_receive(host->socket, &host->receivedAddress, &buffer, 1);
  2000. if (receivedLength == -2)
  2001. continue;
  2002. if (receivedLength < 0)
  2003. return -1;
  2004. if (receivedLength == 0)
  2005. return 0;
  2006. host->receivedData = host->packetData[0];
  2007. host->receivedDataLength = receivedLength;
  2008. host->totalReceivedData += receivedLength;
  2009. host->totalReceivedPackets++;
  2010. if (host->interceptCallback != NULL) {
  2011. switch (host->interceptCallback(host, (void*)event)) {
  2012. case 1:
  2013. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2014. return 1;
  2015. continue;
  2016. case -1:
  2017. return -1;
  2018. default:
  2019. break;
  2020. }
  2021. }
  2022. switch (enet_protocol_handle_incoming_commands(host, event)) {
  2023. case 1:
  2024. return 1;
  2025. case -1:
  2026. return -1;
  2027. default:
  2028. break;
  2029. }
  2030. }
  2031. return -1;
  2032. }
  2033. static void enet_protocol_send_acknowledgements(ENetHost* host, ENetPeer* peer) {
  2034. ENetProtocol* command = &host->commands[host->commandCount];
  2035. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2036. ENetAcknowledgement* acknowledgement;
  2037. ENetListIterator currentAcknowledgement;
  2038. enet_uint16 reliableSequenceNumber;
  2039. currentAcknowledgement = enet_list_begin(&peer->acknowledgements);
  2040. while (currentAcknowledgement != enet_list_end(&peer->acknowledgements)) {
  2041. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < sizeof(ENetProtocolAcknowledge)) {
  2042. host->continueSending = 1;
  2043. break;
  2044. }
  2045. acknowledgement = (ENetAcknowledgement*)currentAcknowledgement;
  2046. currentAcknowledgement = enet_list_next(currentAcknowledgement);
  2047. buffer->data = command;
  2048. buffer->dataLength = sizeof(ENetProtocolAcknowledge);
  2049. host->packetSize += buffer->dataLength;
  2050. reliableSequenceNumber = ENET_HOST_TO_NET_16(acknowledgement->command.header.reliableSequenceNumber);
  2051. command->header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
  2052. command->header.channelID = acknowledgement->command.header.channelID;
  2053. command->header.reliableSequenceNumber = reliableSequenceNumber;
  2054. command->acknowledge.receivedReliableSequenceNumber = reliableSequenceNumber;
  2055. command->acknowledge.receivedSentTime = ENET_HOST_TO_NET_16(acknowledgement->sentTime);
  2056. if ((acknowledgement->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2057. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  2058. enet_list_remove(&acknowledgement->acknowledgementList);
  2059. enet_free(acknowledgement);
  2060. ++command;
  2061. ++buffer;
  2062. }
  2063. host->commandCount = command - host->commands;
  2064. host->bufferCount = buffer - host->buffers;
  2065. }
  2066. static void enet_protocol_send_unreliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2067. ENetProtocol* command = &host->commands[host->commandCount];
  2068. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2069. ENetOutgoingCommand* outgoingCommand;
  2070. ENetListIterator currentCommand;
  2071. currentCommand = enet_list_begin(&peer->outgoingUnreliableCommands);
  2072. while (currentCommand != enet_list_end(&peer->outgoingUnreliableCommands)) {
  2073. size_t commandSize;
  2074. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2075. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2076. 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)) {
  2077. host->continueSending = 1;
  2078. break;
  2079. }
  2080. currentCommand = enet_list_next(currentCommand);
  2081. if (outgoingCommand->packet != NULL && outgoingCommand->fragmentOffset == 0) {
  2082. peer->packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER;
  2083. peer->packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE;
  2084. if (peer->packetThrottleCounter > peer->packetThrottle) {
  2085. enet_uint16 reliableSequenceNumber = outgoingCommand->reliableSequenceNumber;
  2086. enet_uint16 unreliableSequenceNumber = outgoingCommand->unreliableSequenceNumber;
  2087. for (;;) {
  2088. --outgoingCommand->packet->referenceCount;
  2089. if (outgoingCommand->packet->referenceCount == 0)
  2090. enet_packet_destroy(outgoingCommand->packet);
  2091. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2092. enet_free(outgoingCommand);
  2093. if (currentCommand == enet_list_end(&peer->outgoingUnreliableCommands))
  2094. break;
  2095. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2096. if (outgoingCommand->reliableSequenceNumber != reliableSequenceNumber || outgoingCommand->unreliableSequenceNumber != unreliableSequenceNumber)
  2097. break;
  2098. currentCommand = enet_list_next(currentCommand);
  2099. }
  2100. continue;
  2101. }
  2102. }
  2103. buffer->data = command;
  2104. buffer->dataLength = commandSize;
  2105. host->packetSize += buffer->dataLength;
  2106. *command = outgoingCommand->command;
  2107. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2108. if (outgoingCommand->packet != NULL) {
  2109. ++buffer;
  2110. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2111. buffer->dataLength = outgoingCommand->fragmentLength;
  2112. host->packetSize += buffer->dataLength;
  2113. enet_list_insert(enet_list_end(&peer->sentUnreliableCommands), outgoingCommand);
  2114. } else {
  2115. enet_free(outgoingCommand);
  2116. }
  2117. ++command;
  2118. ++buffer;
  2119. }
  2120. host->commandCount = command - host->commands;
  2121. host->bufferCount = buffer - host->buffers;
  2122. 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))
  2123. enet_peer_disconnect(peer, peer->eventData);
  2124. }
  2125. static int enet_protocol_check_timeouts(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  2126. ENetOutgoingCommand* outgoingCommand;
  2127. ENetListIterator currentCommand, insertPosition;
  2128. currentCommand = enet_list_begin(&peer->sentReliableCommands);
  2129. insertPosition = enet_list_begin(&peer->outgoingReliableCommands);
  2130. while (currentCommand != enet_list_end(&peer->sentReliableCommands)) {
  2131. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2132. currentCommand = enet_list_next(currentCommand);
  2133. if (ENET_TIME_DIFFERENCE(host->serviceTime, outgoingCommand->sentTime) < outgoingCommand->roundTripTimeout)
  2134. continue;
  2135. if (peer->earliestTimeout == 0 || ENET_TIME_LESS(outgoingCommand->sentTime, peer->earliestTimeout))
  2136. peer->earliestTimeout = outgoingCommand->sentTime;
  2137. 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))) {
  2138. enet_protocol_notify_disconnect_timeout(host, peer, event);
  2139. return 1;
  2140. }
  2141. if (outgoingCommand->packet != NULL)
  2142. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  2143. ++peer->packetsLost;
  2144. ++peer->totalPacketsLost;
  2145. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2146. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2147. enet_list_insert(insertPosition, enet_list_remove(&outgoingCommand->outgoingCommandList));
  2148. if (currentCommand == enet_list_begin(&peer->sentReliableCommands) && !enet_list_empty(&peer->sentReliableCommands)) {
  2149. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2150. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  2151. }
  2152. }
  2153. return 0;
  2154. }
  2155. static int enet_protocol_send_reliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2156. ENetProtocol* command = &host->commands[host->commandCount];
  2157. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2158. ENetOutgoingCommand* outgoingCommand;
  2159. ENetListIterator currentCommand;
  2160. ENetChannel* channel;
  2161. enet_uint16 reliableWindow;
  2162. size_t commandSize;
  2163. int windowExceeded = 0, windowWrap = 0, canPing = 1;
  2164. currentCommand = enet_list_begin(&peer->outgoingReliableCommands);
  2165. while (currentCommand != enet_list_end(&peer->outgoingReliableCommands)) {
  2166. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2167. channel = outgoingCommand->command.header.channelID < peer->channelCount ? &peer->channels[outgoingCommand->command.header.channelID] : NULL;
  2168. reliableWindow = outgoingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2169. if (channel != NULL) {
  2170. 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)))))
  2171. windowWrap = 1;
  2172. if (windowWrap) {
  2173. currentCommand = enet_list_next(currentCommand);
  2174. continue;
  2175. }
  2176. }
  2177. if (outgoingCommand->packet != NULL) {
  2178. if (!windowExceeded) {
  2179. enet_uint32 windowSize = (peer->packetThrottle * peer->windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE;
  2180. if (peer->reliableDataInTransit + outgoingCommand->fragmentLength > ENET_MAX(windowSize, peer->mtu))
  2181. windowExceeded = 1;
  2182. }
  2183. if (windowExceeded) {
  2184. currentCommand = enet_list_next(currentCommand);
  2185. continue;
  2186. }
  2187. }
  2188. canPing = 0;
  2189. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2190. 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))) {
  2191. host->continueSending = 1;
  2192. break;
  2193. }
  2194. currentCommand = enet_list_next(currentCommand);
  2195. if (channel != NULL && outgoingCommand->sendAttempts < 1) {
  2196. channel->usedReliableWindows |= 1 << reliableWindow;
  2197. ++channel->reliableWindows[reliableWindow];
  2198. }
  2199. ++outgoingCommand->sendAttempts;
  2200. if (outgoingCommand->roundTripTimeout == 0) {
  2201. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2202. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2203. }
  2204. if (enet_list_empty(&peer->sentReliableCommands))
  2205. peer->nextTimeout = host->serviceTime + outgoingCommand->roundTripTimeout;
  2206. enet_list_insert(enet_list_end(&peer->sentReliableCommands), enet_list_remove(&outgoingCommand->outgoingCommandList));
  2207. outgoingCommand->sentTime = host->serviceTime;
  2208. buffer->data = command;
  2209. buffer->dataLength = commandSize;
  2210. host->packetSize += buffer->dataLength;
  2211. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_SENT_TIME;
  2212. *command = outgoingCommand->command;
  2213. if (outgoingCommand->packet != NULL) {
  2214. ++buffer;
  2215. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2216. buffer->dataLength = outgoingCommand->fragmentLength;
  2217. host->packetSize += outgoingCommand->fragmentLength;
  2218. peer->reliableDataInTransit += outgoingCommand->fragmentLength;
  2219. }
  2220. ++peer->packetsSent;
  2221. ++peer->totalPacketsSent;
  2222. ++command;
  2223. ++buffer;
  2224. }
  2225. host->commandCount = command - host->commands;
  2226. host->bufferCount = buffer - host->buffers;
  2227. return canPing;
  2228. }
  2229. static int enet_protocol_send_outgoing_commands(ENetHost* host, ENetEvent* event, int checkForTimeouts) {
  2230. enet_uint8 headerData[sizeof(ENetProtocolHeader) + sizeof(enet_uint32)];
  2231. ENetProtocolHeader* header = (ENetProtocolHeader*)headerData;
  2232. ENetPeer* currentPeer;
  2233. int sentLength;
  2234. host->continueSending = 1;
  2235. #ifdef ENET_LZ4
  2236. size_t shouldCompress = 0;
  2237. #endif
  2238. while (host->continueSending) {
  2239. for (host->continueSending = 0, currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2240. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED || currentPeer->state == ENET_PEER_STATE_ZOMBIE)
  2241. continue;
  2242. host->headerFlags = 0;
  2243. host->commandCount = 0;
  2244. host->bufferCount = 1;
  2245. host->packetSize = sizeof(ENetProtocolHeader);
  2246. if (!enet_list_empty(&currentPeer->acknowledgements))
  2247. enet_protocol_send_acknowledgements(host, currentPeer);
  2248. if (checkForTimeouts != 0 && !enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_GREATER_EQUAL(host->serviceTime, currentPeer->nextTimeout) && enet_protocol_check_timeouts(host, currentPeer, event) == 1) {
  2249. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2250. return 1;
  2251. else
  2252. continue;
  2253. }
  2254. 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)) {
  2255. enet_peer_ping(currentPeer);
  2256. enet_protocol_send_reliable_outgoing_commands(host, currentPeer);
  2257. }
  2258. if (!enet_list_empty(&currentPeer->outgoingUnreliableCommands))
  2259. enet_protocol_send_unreliable_outgoing_commands(host, currentPeer);
  2260. if (host->commandCount == 0)
  2261. continue;
  2262. if (currentPeer->packetLossEpoch == 0) {
  2263. currentPeer->packetLossEpoch = host->serviceTime;
  2264. } else if (ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->packetLossEpoch) >= ENET_PEER_PACKET_LOSS_INTERVAL && currentPeer->packetsSent > 0) {
  2265. enet_uint32 packetLoss = currentPeer->packetsLost * ENET_PEER_PACKET_LOSS_SCALE / currentPeer->packetsSent;
  2266. ENET_LOG_TRACE(
  2267. "peer %u: %f%%+-%f%% packet loss, %u+-%u ms round trip time, %f%% throttle, %u/%u outgoing, %u/%u incoming\n", currentPeer->incomingPeerID,
  2268. currentPeer->packetLoss / (float)ENET_PEER_PACKET_LOSS_SCALE,
  2269. currentPeer->packetLossVariance / (float)ENET_PEER_PACKET_LOSS_SCALE, currentPeer->roundTripTime, currentPeer->roundTripTimeVariance,
  2270. currentPeer->packetThrottle / (float)ENET_PEER_PACKET_THROTTLE_SCALE,
  2271. enet_list_size(&currentPeer->outgoingReliableCommands),
  2272. enet_list_size(&currentPeer->outgoingUnreliableCommands),
  2273. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingReliableCommands) : 0,
  2274. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingUnreliableCommands) : 0
  2275. );
  2276. currentPeer->packetLossVariance -= currentPeer->packetLossVariance / 4;
  2277. if (packetLoss >= currentPeer->packetLoss) {
  2278. currentPeer->packetLoss += (packetLoss - currentPeer->packetLoss) / 8;
  2279. currentPeer->packetLossVariance += (packetLoss - currentPeer->packetLoss) / 4;
  2280. } else {
  2281. currentPeer->packetLoss -= (currentPeer->packetLoss - packetLoss) / 8;
  2282. currentPeer->packetLossVariance += (currentPeer->packetLoss - packetLoss) / 4;
  2283. }
  2284. currentPeer->packetLossEpoch = host->serviceTime;
  2285. currentPeer->packetsSent = 0;
  2286. currentPeer->packetsLost = 0;
  2287. }
  2288. host->buffers->data = headerData;
  2289. if (host->headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME) {
  2290. header->sentTime = ENET_HOST_TO_NET_16(host->serviceTime & 0xFFFF);
  2291. host->buffers->dataLength = sizeof(ENetProtocolHeader);
  2292. } else {
  2293. host->buffers->dataLength = (size_t)&((ENetProtocolHeader*)0)->sentTime;
  2294. }
  2295. #ifdef ENET_LZ4
  2296. if (host->compression == 1 && host->packetSize > 64) {
  2297. size_t originalSize = host->packetSize - sizeof(ENetProtocolHeader), compressedSize = 0;
  2298. const ENetBuffer* buffers = &host->buffers[1];
  2299. if (host->compressionBufferSize < originalSize) {
  2300. enet_free(host->compressionBuffer);
  2301. host->compressionBuffer = (char*)enet_malloc(originalSize);
  2302. host->compressionBufferSize = originalSize;
  2303. }
  2304. size_t totalSize = originalSize, dataSize = 0;
  2305. while (totalSize) {
  2306. size_t i;
  2307. for (i = 0; i < host->bufferCount - 1; i++) {
  2308. size_t copySize = ENET_MIN(totalSize, buffers[i].dataLength);
  2309. memcpy(host->compressionBuffer + dataSize, buffers[i].data, copySize);
  2310. totalSize -= copySize;
  2311. dataSize += copySize;
  2312. }
  2313. }
  2314. compressedSize = LZ4_compress_default((const char*)host->compressionBuffer, (char*)host->packetData[1], dataSize, originalSize);
  2315. if (compressedSize > 0 && compressedSize < originalSize) {
  2316. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_COMPRESSED;
  2317. shouldCompress = compressedSize;
  2318. ENET_LOG_TRACE("peer %u: compressed %u->%u (%u%%)\n", currentPeer->incomingPeerID, originalSize, compressedSize, (compressedSize * 100) / originalSize);
  2319. }
  2320. }
  2321. #endif
  2322. if (currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2323. host->headerFlags |= currentPeer->outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  2324. header->peerID = ENET_HOST_TO_NET_16(currentPeer->outgoingPeerID | host->headerFlags);
  2325. if (host->checksumCallback != NULL) {
  2326. enet_uint32* checksum = (enet_uint32*)&headerData[host->buffers->dataLength];
  2327. *checksum = currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer->connectID : 0;
  2328. host->buffers->dataLength += sizeof(enet_uint32);
  2329. *checksum = host->checksumCallback(host->buffers, host->bufferCount);
  2330. }
  2331. #ifdef ENET_LZ4
  2332. if (shouldCompress > 0) {
  2333. host->buffers[1].data = host->packetData[1];
  2334. host->buffers[1].dataLength = shouldCompress;
  2335. host->bufferCount = 2;
  2336. }
  2337. #endif
  2338. currentPeer->lastSendTime = host->serviceTime;
  2339. sentLength = enet_socket_send(host->socket, &currentPeer->address, host->buffers, host->bufferCount);
  2340. enet_protocol_remove_sent_unreliable_commands(currentPeer);
  2341. if (sentLength < 0)
  2342. return -1;
  2343. host->totalSentData += sentLength;
  2344. currentPeer->totalDataSent += sentLength;
  2345. host->totalSentPackets++;
  2346. }
  2347. }
  2348. return 0;
  2349. }
  2350. void enet_host_flush(ENetHost* host) {
  2351. host->serviceTime = enet_time_get();
  2352. enet_protocol_send_outgoing_commands(host, NULL, 0);
  2353. }
  2354. int enet_host_check_events(ENetHost* host, ENetEvent* event) {
  2355. if (event == NULL)
  2356. return -1;
  2357. event->type = ENET_EVENT_TYPE_NONE;
  2358. event->peer = NULL;
  2359. event->packet = NULL;
  2360. return enet_protocol_dispatch_incoming_commands(host, event);
  2361. }
  2362. int enet_host_service(ENetHost* host, ENetEvent* event, enet_uint32 timeout) {
  2363. enet_uint32 waitCondition;
  2364. if (event != NULL) {
  2365. event->type = ENET_EVENT_TYPE_NONE;
  2366. event->peer = NULL;
  2367. event->packet = NULL;
  2368. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2369. case 1:
  2370. return 1;
  2371. case -1:
  2372. #ifdef ENET_DEBUG
  2373. ENET_LOG_ERROR("Error dispatching incoming packets");
  2374. #endif
  2375. return -1;
  2376. default:
  2377. break;
  2378. }
  2379. }
  2380. host->serviceTime = enet_time_get();
  2381. timeout += host->serviceTime;
  2382. do {
  2383. if (ENET_TIME_DIFFERENCE(host->serviceTime, host->bandwidthThrottleEpoch) >= ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  2384. enet_host_bandwidth_throttle(host);
  2385. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2386. case 1:
  2387. return 1;
  2388. case -1:
  2389. ENET_LOG_ERROR("Error sending outgoing packets");
  2390. return -1;
  2391. default:
  2392. break;
  2393. }
  2394. switch (enet_protocol_receive_incoming_commands(host, event)) {
  2395. case 1:
  2396. return 1;
  2397. case -1:
  2398. ENET_LOG_ERROR("Error receiving incoming packets");
  2399. return -1;
  2400. default:
  2401. break;
  2402. }
  2403. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2404. case 1:
  2405. return 1;
  2406. case -1:
  2407. ENET_LOG_ERROR("Error dispatching outgoing packets!");
  2408. return -1;
  2409. default:
  2410. break;
  2411. }
  2412. if (event != NULL) {
  2413. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2414. case 1:
  2415. return 1;
  2416. case -1:
  2417. ENET_LOG_ERROR("Error dispatching incoming packets!");
  2418. return -1;
  2419. default:
  2420. break;
  2421. }
  2422. }
  2423. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2424. return 0;
  2425. do {
  2426. host->serviceTime = enet_time_get();
  2427. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2428. return 0;
  2429. waitCondition = ENET_SOCKET_WAIT_RECEIVE | ENET_SOCKET_WAIT_INTERRUPT;
  2430. if (enet_socket_wait(host->socket, &waitCondition, ENET_TIME_DIFFERENCE(timeout, host->serviceTime)) != 0)
  2431. return -1;
  2432. }
  2433. while (waitCondition & ENET_SOCKET_WAIT_INTERRUPT);
  2434. host->serviceTime = enet_time_get();
  2435. }
  2436. while (waitCondition & ENET_SOCKET_WAIT_RECEIVE);
  2437. return 0;
  2438. }
  2439. /*
  2440. =======================================================================
  2441. Peer
  2442. =======================================================================
  2443. */
  2444. void enet_peer_throttle_configure(ENetPeer* peer, enet_uint32 interval, enet_uint32 acceleration, enet_uint32 deceleration, enet_uint32 threshold) {
  2445. ENetProtocol command;
  2446. peer->packetThrottleThreshold = threshold;
  2447. peer->packetThrottleInterval = interval;
  2448. peer->packetThrottleAcceleration = acceleration;
  2449. peer->packetThrottleDeceleration = deceleration;
  2450. command.header.command = ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2451. command.header.channelID = 0xFF;
  2452. command.throttleConfigure.packetThrottleInterval = ENET_HOST_TO_NET_32(interval);
  2453. command.throttleConfigure.packetThrottleAcceleration = ENET_HOST_TO_NET_32(acceleration);
  2454. command.throttleConfigure.packetThrottleDeceleration = ENET_HOST_TO_NET_32(deceleration);
  2455. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2456. }
  2457. int enet_peer_throttle(ENetPeer* peer, enet_uint32 rtt) {
  2458. if (peer->lastRoundTripTime <= peer->lastRoundTripTimeVariance) {
  2459. peer->packetThrottle = peer->packetThrottleLimit;
  2460. } else if (rtt < peer->lastRoundTripTime) {
  2461. peer->packetThrottle += peer->packetThrottleAcceleration;
  2462. if (peer->packetThrottle > peer->packetThrottleLimit)
  2463. peer->packetThrottle = peer->packetThrottleLimit;
  2464. return 1;
  2465. } else if (rtt > peer->lastRoundTripTime + peer->packetThrottleThreshold + 2 * peer->lastRoundTripTimeVariance) {
  2466. if (peer->packetThrottle > peer->packetThrottleDeceleration)
  2467. peer->packetThrottle -= peer->packetThrottleDeceleration;
  2468. else
  2469. peer->packetThrottle = 0;
  2470. return -1;
  2471. }
  2472. return 0;
  2473. }
  2474. int enet_peer_send(ENetPeer* peer, enet_uint8 channelID, ENetPacket* packet) {
  2475. ENetChannel* channel = &peer->channels[channelID];
  2476. ENetProtocol command;
  2477. size_t fragmentLength;
  2478. if (peer->state != ENET_PEER_STATE_CONNECTED || channelID >= peer->channelCount || packet->dataLength > peer->host->maximumPacketSize) {
  2479. 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");
  2480. return -1;
  2481. }
  2482. fragmentLength = peer->mtu - sizeof(ENetProtocolHeader) - sizeof(ENetProtocolSendFragment);
  2483. if (peer->host->checksumCallback != NULL)
  2484. fragmentLength -= sizeof(enet_uint32);
  2485. if (packet->dataLength > fragmentLength) {
  2486. enet_uint32 fragmentCount = (packet->dataLength + fragmentLength - 1) / fragmentLength, fragmentNumber, fragmentOffset;
  2487. enet_uint8 commandNumber;
  2488. enet_uint16 startSequenceNumber;
  2489. ENetList fragments;
  2490. ENetOutgoingCommand* fragment;
  2491. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT) {
  2492. ENET_LOG_ERROR("Cannot send data. Too many fragments (%u vs %u)", fragmentCount, ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT);
  2493. return -1;
  2494. }
  2495. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED)) == ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED && channel->outgoingUnreliableSequenceNumber < 0xFFFF) {
  2496. commandNumber = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT;
  2497. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingUnreliableSequenceNumber + 1);
  2498. } else {
  2499. commandNumber = ENET_PROTOCOL_COMMAND_SEND_FRAGMENT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2500. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingReliableSequenceNumber + 1);
  2501. }
  2502. enet_list_clear(&fragments);
  2503. for (fragmentNumber = 0, fragmentOffset = 0; fragmentOffset < packet->dataLength; ++fragmentNumber, fragmentOffset += fragmentLength) {
  2504. if (packet->dataLength - fragmentOffset < fragmentLength)
  2505. fragmentLength = packet->dataLength - fragmentOffset;
  2506. fragment = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2507. if (fragment == NULL) {
  2508. while (!enet_list_empty(&fragments)) {
  2509. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2510. enet_free(fragment);
  2511. }
  2512. ENET_LOG_ERROR("Cannot send data. A fragment was null.");
  2513. return -1;
  2514. }
  2515. fragment->fragmentOffset = fragmentOffset;
  2516. fragment->fragmentLength = fragmentLength;
  2517. fragment->packet = packet;
  2518. fragment->command.header.command = commandNumber;
  2519. fragment->command.header.channelID = channelID;
  2520. fragment->command.sendFragment.startSequenceNumber = startSequenceNumber;
  2521. fragment->command.sendFragment.dataLength = ENET_HOST_TO_NET_16(fragmentLength);
  2522. fragment->command.sendFragment.fragmentCount = ENET_HOST_TO_NET_32(fragmentCount);
  2523. fragment->command.sendFragment.fragmentNumber = ENET_HOST_TO_NET_32(fragmentNumber);
  2524. fragment->command.sendFragment.totalLength = ENET_HOST_TO_NET_32(packet->dataLength);
  2525. fragment->command.sendFragment.fragmentOffset = ENET_NET_TO_HOST_32(fragmentOffset);
  2526. enet_list_insert(enet_list_end(&fragments), fragment);
  2527. }
  2528. packet->referenceCount += fragmentNumber;
  2529. while (!enet_list_empty(&fragments)) {
  2530. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2531. enet_peer_setup_outgoing_command(peer, fragment);
  2532. }
  2533. return 0;
  2534. }
  2535. command.header.channelID = channelID;
  2536. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNSEQUENCED)) == ENET_PACKET_FLAG_UNSEQUENCED) {
  2537. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2538. command.sendUnsequenced.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2539. } else if (packet->flags & ENET_PACKET_FLAG_RELIABLE || channel->outgoingUnreliableSequenceNumber >= 0xFFFF) {
  2540. command.header.command = ENET_PROTOCOL_COMMAND_SEND_RELIABLE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2541. command.sendReliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2542. } else {
  2543. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE;
  2544. command.sendUnreliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2545. }
  2546. if (enet_peer_queue_outgoing_command(peer, &command, packet, 0, packet->dataLength) == NULL)
  2547. return -1;
  2548. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  2549. enet_host_flush(peer->host);
  2550. return 0;
  2551. }
  2552. ENetPacket* enet_peer_receive(ENetPeer* peer, enet_uint8* channelID) {
  2553. ENetIncomingCommand* incomingCommand;
  2554. ENetPacket* packet;
  2555. if (enet_list_empty(&peer->dispatchedCommands))
  2556. return NULL;
  2557. incomingCommand = (ENetIncomingCommand*)enet_list_remove(enet_list_begin(&peer->dispatchedCommands));
  2558. if (channelID != NULL)
  2559. *channelID = incomingCommand->command.header.channelID;
  2560. packet = incomingCommand->packet;
  2561. --packet->referenceCount;
  2562. if (incomingCommand->fragments != NULL)
  2563. enet_free(incomingCommand->fragments);
  2564. enet_free(incomingCommand);
  2565. peer->totalWaitingData -= packet->dataLength;
  2566. return packet;
  2567. }
  2568. static void enet_peer_reset_outgoing_commands(ENetList* queue) {
  2569. ENetOutgoingCommand* outgoingCommand;
  2570. while (!enet_list_empty(queue)) {
  2571. outgoingCommand = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(queue));
  2572. if (outgoingCommand->packet != NULL) {
  2573. --outgoingCommand->packet->referenceCount;
  2574. if (outgoingCommand->packet->referenceCount == 0)
  2575. enet_packet_destroy(outgoingCommand->packet);
  2576. }
  2577. enet_free(outgoingCommand);
  2578. }
  2579. }
  2580. static void enet_peer_remove_incoming_commands(ENetList* queue, ENetListIterator startCommand, ENetListIterator endCommand) {
  2581. ENetListIterator currentCommand;
  2582. for (currentCommand = startCommand; currentCommand != endCommand;) {
  2583. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2584. currentCommand = enet_list_next(currentCommand);
  2585. enet_list_remove(&incomingCommand->incomingCommandList);
  2586. if (incomingCommand->packet != NULL) {
  2587. --incomingCommand->packet->referenceCount;
  2588. if (incomingCommand->packet->referenceCount == 0)
  2589. enet_packet_destroy(incomingCommand->packet);
  2590. }
  2591. if (incomingCommand->fragments != NULL)
  2592. enet_free(incomingCommand->fragments);
  2593. enet_free(incomingCommand);
  2594. }
  2595. }
  2596. static void enet_peer_reset_incoming_commands(ENetList* queue) {
  2597. enet_peer_remove_incoming_commands(queue, enet_list_begin(queue), enet_list_end(queue));
  2598. }
  2599. void enet_peer_reset_queues(ENetPeer* peer) {
  2600. ENetChannel* channel;
  2601. if (peer->needsDispatch) {
  2602. enet_list_remove(&peer->dispatchList);
  2603. peer->needsDispatch = 0;
  2604. }
  2605. while (!enet_list_empty(&peer->acknowledgements)) {
  2606. enet_free(enet_list_remove(enet_list_begin(&peer->acknowledgements)));
  2607. }
  2608. enet_peer_reset_outgoing_commands(&peer->sentReliableCommands);
  2609. enet_peer_reset_outgoing_commands(&peer->sentUnreliableCommands);
  2610. enet_peer_reset_outgoing_commands(&peer->outgoingReliableCommands);
  2611. enet_peer_reset_outgoing_commands(&peer->outgoingUnreliableCommands);
  2612. enet_peer_reset_incoming_commands(&peer->dispatchedCommands);
  2613. if (peer->channels != NULL && peer->channelCount > 0) {
  2614. for (channel = peer->channels; channel < &peer->channels[peer->channelCount]; ++channel) {
  2615. enet_peer_reset_incoming_commands(&channel->incomingReliableCommands);
  2616. enet_peer_reset_incoming_commands(&channel->incomingUnreliableCommands);
  2617. }
  2618. enet_free(peer->channels);
  2619. }
  2620. peer->channels = NULL;
  2621. peer->channelCount = 0;
  2622. }
  2623. void enet_peer_on_connect(ENetPeer* peer) {
  2624. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  2625. if (peer->incomingBandwidth != 0)
  2626. ++peer->host->bandwidthLimitedPeers;
  2627. ++peer->host->connectedPeers;
  2628. }
  2629. }
  2630. void enet_peer_on_disconnect(ENetPeer* peer) {
  2631. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2632. if (peer->incomingBandwidth != 0)
  2633. --peer->host->bandwidthLimitedPeers;
  2634. --peer->host->connectedPeers;
  2635. }
  2636. }
  2637. void enet_peer_reset(ENetPeer* peer) {
  2638. enet_peer_on_disconnect(peer);
  2639. peer->outgoingPeerID = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  2640. peer->state = ENET_PEER_STATE_DISCONNECTED;
  2641. peer->incomingBandwidth = 0;
  2642. peer->outgoingBandwidth = 0;
  2643. peer->incomingBandwidthThrottleEpoch = 0;
  2644. peer->outgoingBandwidthThrottleEpoch = 0;
  2645. peer->incomingDataTotal = 0;
  2646. peer->totalDataReceived = 0;
  2647. peer->outgoingDataTotal = 0;
  2648. peer->totalDataSent = 0;
  2649. peer->lastSendTime = 0;
  2650. peer->lastReceiveTime = 0;
  2651. peer->nextTimeout = 0;
  2652. peer->earliestTimeout = 0;
  2653. peer->packetLossEpoch = 0;
  2654. peer->packetsSent = 0;
  2655. peer->totalPacketsSent = 0;
  2656. peer->packetsLost = 0;
  2657. peer->totalPacketsLost = 0;
  2658. peer->packetLoss = 0;
  2659. peer->packetLossVariance = 0;
  2660. peer->packetThrottle = ENET_PEER_DEFAULT_PACKET_THROTTLE;
  2661. peer->packetThrottleLimit = ENET_PEER_PACKET_THROTTLE_SCALE;
  2662. peer->packetThrottleCounter = 0;
  2663. peer->packetThrottleEpoch = 0;
  2664. peer->packetThrottleAcceleration = ENET_PEER_PACKET_THROTTLE_ACCELERATION;
  2665. peer->packetThrottleDeceleration = ENET_PEER_PACKET_THROTTLE_DECELERATION;
  2666. peer->packetThrottleInterval = ENET_PEER_PACKET_THROTTLE_INTERVAL;
  2667. peer->pingInterval = ENET_PEER_PING_INTERVAL;
  2668. peer->timeoutLimit = ENET_PEER_TIMEOUT_LIMIT;
  2669. peer->timeoutMinimum = ENET_PEER_TIMEOUT_MINIMUM;
  2670. peer->timeoutMaximum = ENET_PEER_TIMEOUT_MAXIMUM;
  2671. peer->smoothedRoundTripTime = 0;
  2672. peer->lastRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2673. peer->lowestRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2674. peer->lastRoundTripTimeVariance = 0;
  2675. peer->highestRoundTripTimeVariance = 0;
  2676. peer->roundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2677. peer->roundTripTimeVariance = 0;
  2678. peer->mtu = peer->host->mtu;
  2679. peer->reliableDataInTransit = 0;
  2680. peer->outgoingReliableSequenceNumber = 0;
  2681. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  2682. peer->incomingUnsequencedGroup = 0;
  2683. peer->outgoingUnsequencedGroup = 0;
  2684. peer->eventData = 0;
  2685. peer->totalWaitingData = 0;
  2686. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  2687. enet_peer_reset_queues(peer);
  2688. }
  2689. void enet_peer_ping(ENetPeer* peer) {
  2690. ENetProtocol command;
  2691. if (peer->state != ENET_PEER_STATE_CONNECTED)
  2692. return;
  2693. command.header.command = ENET_PROTOCOL_COMMAND_PING | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2694. command.header.channelID = 0xFF;
  2695. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2696. }
  2697. void enet_peer_ping_interval(ENetPeer* peer, enet_uint32 pingInterval) {
  2698. peer->pingInterval = pingInterval ? pingInterval : ENET_PEER_PING_INTERVAL;
  2699. }
  2700. void enet_peer_timeout(ENetPeer* peer, enet_uint32 timeoutLimit, enet_uint32 timeoutMinimum, enet_uint32 timeoutMaximum) {
  2701. peer->timeoutLimit = timeoutLimit ? timeoutLimit : ENET_PEER_TIMEOUT_LIMIT;
  2702. peer->timeoutMinimum = timeoutMinimum ? timeoutMinimum : ENET_PEER_TIMEOUT_MINIMUM;
  2703. peer->timeoutMaximum = timeoutMaximum ? timeoutMaximum : ENET_PEER_TIMEOUT_MAXIMUM;
  2704. }
  2705. void enet_peer_disconnect_now(ENetPeer* peer, enet_uint32 data) {
  2706. ENetProtocol command;
  2707. if (peer->state == ENET_PEER_STATE_DISCONNECTED)
  2708. return;
  2709. if (peer->state != ENET_PEER_STATE_ZOMBIE && peer->state != ENET_PEER_STATE_DISCONNECTING) {
  2710. enet_peer_reset_queues(peer);
  2711. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2712. command.header.channelID = 0xFF;
  2713. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2714. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2715. enet_host_flush(peer->host);
  2716. }
  2717. enet_peer_reset(peer);
  2718. }
  2719. void enet_peer_disconnect(ENetPeer* peer, enet_uint32 data) {
  2720. ENetProtocol command;
  2721. 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)
  2722. return;
  2723. enet_peer_reset_queues(peer);
  2724. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT;
  2725. command.header.channelID = 0xFF;
  2726. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2727. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2728. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2729. else
  2730. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2731. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2732. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2733. enet_peer_on_disconnect(peer);
  2734. peer->state = ENET_PEER_STATE_DISCONNECTING;
  2735. } else {
  2736. enet_host_flush(peer->host);
  2737. enet_peer_reset(peer);
  2738. }
  2739. }
  2740. void enet_peer_disconnect_later(ENetPeer* peer, enet_uint32 data) {
  2741. 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))) {
  2742. peer->state = ENET_PEER_STATE_DISCONNECT_LATER;
  2743. peer->eventData = data;
  2744. } else {
  2745. enet_peer_disconnect(peer, data);
  2746. }
  2747. }
  2748. ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer* peer, const ENetProtocol* command, enet_uint16 sentTime) {
  2749. ENetAcknowledgement* acknowledgement;
  2750. if (command->header.channelID < peer->channelCount) {
  2751. ENetChannel* channel = &peer->channels[command->header.channelID];
  2752. enet_uint16 reliableWindow = command->header.reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2753. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2754. if (command->header.reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2755. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2756. if (reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1 && reliableWindow <= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS)
  2757. return NULL;
  2758. }
  2759. acknowledgement = (ENetAcknowledgement*)enet_malloc(sizeof(ENetAcknowledgement));
  2760. if (acknowledgement == NULL)
  2761. return NULL;
  2762. peer->outgoingDataTotal += sizeof(ENetProtocolAcknowledge);
  2763. acknowledgement->sentTime = sentTime;
  2764. acknowledgement->command = *command;
  2765. enet_list_insert(enet_list_end(&peer->acknowledgements), acknowledgement);
  2766. return acknowledgement;
  2767. }
  2768. void enet_peer_setup_outgoing_command(ENetPeer* peer, ENetOutgoingCommand* outgoingCommand) {
  2769. ENetChannel* channel = &peer->channels[outgoingCommand->command.header.channelID];
  2770. peer->outgoingDataTotal += enet_protocol_command_size(outgoingCommand->command.header.command) + outgoingCommand->fragmentLength;
  2771. if (outgoingCommand->command.header.channelID == 0xFF) {
  2772. ++peer->outgoingReliableSequenceNumber;
  2773. outgoingCommand->reliableSequenceNumber = peer->outgoingReliableSequenceNumber;
  2774. outgoingCommand->unreliableSequenceNumber = 0;
  2775. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2776. ++channel->outgoingReliableSequenceNumber;
  2777. channel->outgoingUnreliableSequenceNumber = 0;
  2778. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2779. outgoingCommand->unreliableSequenceNumber = 0;
  2780. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED) {
  2781. ++peer->outgoingUnsequencedGroup;
  2782. outgoingCommand->reliableSequenceNumber = 0;
  2783. outgoingCommand->unreliableSequenceNumber = 0;
  2784. } else {
  2785. if (outgoingCommand->fragmentOffset == 0)
  2786. ++channel->outgoingUnreliableSequenceNumber;
  2787. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2788. outgoingCommand->unreliableSequenceNumber = channel->outgoingUnreliableSequenceNumber;
  2789. }
  2790. outgoingCommand->sendAttempts = 0;
  2791. outgoingCommand->sentTime = 0;
  2792. outgoingCommand->roundTripTimeout = 0;
  2793. outgoingCommand->roundTripTimeoutLimit = 0;
  2794. outgoingCommand->command.header.reliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->reliableSequenceNumber);
  2795. switch (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2796. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2797. outgoingCommand->command.sendUnreliable.unreliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->unreliableSequenceNumber);
  2798. break;
  2799. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2800. outgoingCommand->command.sendUnsequenced.unsequencedGroup = ENET_HOST_TO_NET_16(peer->outgoingUnsequencedGroup);
  2801. break;
  2802. default:
  2803. break;
  2804. }
  2805. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)
  2806. enet_list_insert(enet_list_end(&peer->outgoingReliableCommands), outgoingCommand);
  2807. else
  2808. enet_list_insert(enet_list_end(&peer->outgoingUnreliableCommands), outgoingCommand);
  2809. }
  2810. ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer* peer, const ENetProtocol* command, ENetPacket* packet, enet_uint32 offset, enet_uint16 length) {
  2811. ENetOutgoingCommand* outgoingCommand = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2812. if (outgoingCommand == NULL)
  2813. return NULL;
  2814. outgoingCommand->command = *command;
  2815. outgoingCommand->fragmentOffset = offset;
  2816. outgoingCommand->fragmentLength = length;
  2817. outgoingCommand->packet = packet;
  2818. if (packet != NULL)
  2819. ++packet->referenceCount;
  2820. enet_peer_setup_outgoing_command(peer, outgoingCommand);
  2821. return outgoingCommand;
  2822. }
  2823. void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2824. ENetListIterator droppedCommand, startCommand, currentCommand;
  2825. for (droppedCommand = startCommand = currentCommand = enet_list_begin(&channel->incomingUnreliableCommands); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2826. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2827. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2828. continue;
  2829. if (incomingCommand->reliableSequenceNumber == channel->incomingReliableSequenceNumber) {
  2830. if (incomingCommand->fragmentsRemaining <= 0) {
  2831. channel->incomingUnreliableSequenceNumber = incomingCommand->unreliableSequenceNumber;
  2832. continue;
  2833. }
  2834. if (startCommand != currentCommand) {
  2835. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2836. if (!peer->needsDispatch) {
  2837. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2838. peer->needsDispatch = 1;
  2839. }
  2840. droppedCommand = currentCommand;
  2841. } else if (droppedCommand != currentCommand)
  2842. droppedCommand = enet_list_previous(currentCommand);
  2843. } else {
  2844. enet_uint16 reliableWindow = incomingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2845. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2846. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2847. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2848. if (reliableWindow >= currentWindow && reliableWindow < currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2849. break;
  2850. droppedCommand = enet_list_next(currentCommand);
  2851. if (startCommand != currentCommand) {
  2852. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2853. if (!peer->needsDispatch) {
  2854. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2855. peer->needsDispatch = 1;
  2856. }
  2857. }
  2858. }
  2859. startCommand = enet_list_next(currentCommand);
  2860. }
  2861. if (startCommand != currentCommand) {
  2862. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2863. if (!peer->needsDispatch) {
  2864. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2865. peer->needsDispatch = 1;
  2866. }
  2867. droppedCommand = currentCommand;
  2868. }
  2869. enet_peer_remove_incoming_commands(&channel->incomingUnreliableCommands, enet_list_begin(&channel->incomingUnreliableCommands), droppedCommand);
  2870. }
  2871. void enet_peer_dispatch_incoming_reliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2872. ENetListIterator currentCommand;
  2873. for (currentCommand = enet_list_begin(&channel->incomingReliableCommands); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2874. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2875. if (incomingCommand->fragmentsRemaining > 0 || incomingCommand->reliableSequenceNumber != (enet_uint16)(channel->incomingReliableSequenceNumber + 1))
  2876. break;
  2877. channel->incomingReliableSequenceNumber = incomingCommand->reliableSequenceNumber;
  2878. if (incomingCommand->fragmentCount > 0)
  2879. channel->incomingReliableSequenceNumber += incomingCommand->fragmentCount - 1;
  2880. }
  2881. if (currentCommand == enet_list_begin(&channel->incomingReliableCommands))
  2882. return;
  2883. channel->incomingUnreliableSequenceNumber = 0;
  2884. enet_list_move(enet_list_end(&peer->dispatchedCommands), enet_list_begin(&channel->incomingReliableCommands), enet_list_previous(currentCommand));
  2885. if (!peer->needsDispatch) {
  2886. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2887. peer->needsDispatch = 1;
  2888. }
  2889. if (!enet_list_empty(&channel->incomingUnreliableCommands))
  2890. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2891. }
  2892. ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer* peer, const ENetProtocol* command, const void* data, size_t dataLength, enet_uint32 flags, enet_uint32 fragmentCount) {
  2893. static ENetIncomingCommand dummyCommand;
  2894. ENetChannel* channel = &peer->channels[command->header.channelID];
  2895. enet_uint32 unreliableSequenceNumber = 0, reliableSequenceNumber = 0;
  2896. enet_uint16 reliableWindow, currentWindow;
  2897. ENetIncomingCommand* incomingCommand;
  2898. ENetListIterator currentCommand;
  2899. ENetPacket* packet = NULL;
  2900. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2901. goto discardCommand;
  2902. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) {
  2903. reliableSequenceNumber = command->header.reliableSequenceNumber;
  2904. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2905. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2906. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2907. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2908. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2909. goto discardCommand;
  2910. }
  2911. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2912. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2913. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2914. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber)
  2915. goto discardCommand;
  2916. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2917. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2918. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2919. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2920. continue;
  2921. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2922. break;
  2923. }
  2924. if (incomingCommand->reliableSequenceNumber <= reliableSequenceNumber) {
  2925. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2926. break;
  2927. goto discardCommand;
  2928. }
  2929. }
  2930. break;
  2931. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2932. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  2933. unreliableSequenceNumber = ENET_NET_TO_HOST_16(command->sendUnreliable.unreliableSequenceNumber);
  2934. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && unreliableSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  2935. goto discardCommand;
  2936. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2937. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2938. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2939. continue;
  2940. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2941. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2942. continue;
  2943. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2944. break;
  2945. }
  2946. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2947. break;
  2948. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  2949. continue;
  2950. if (incomingCommand->unreliableSequenceNumber <= unreliableSequenceNumber) {
  2951. if (incomingCommand->unreliableSequenceNumber < unreliableSequenceNumber)
  2952. break;
  2953. goto discardCommand;
  2954. }
  2955. }
  2956. break;
  2957. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2958. currentCommand = enet_list_end(&channel->incomingUnreliableCommands);
  2959. break;
  2960. default:
  2961. goto discardCommand;
  2962. }
  2963. if (peer->totalWaitingData >= peer->host->maximumWaitingData)
  2964. goto notifyError;
  2965. packet = enet_packet_create(data, dataLength, flags);
  2966. if (packet == NULL)
  2967. goto notifyError;
  2968. incomingCommand = (ENetIncomingCommand*)enet_malloc(sizeof(ENetIncomingCommand));
  2969. if (incomingCommand == NULL)
  2970. goto notifyError;
  2971. incomingCommand->reliableSequenceNumber = command->header.reliableSequenceNumber;
  2972. incomingCommand->unreliableSequenceNumber = unreliableSequenceNumber & 0xFFFF;
  2973. incomingCommand->command = *command;
  2974. incomingCommand->fragmentCount = fragmentCount;
  2975. incomingCommand->fragmentsRemaining = fragmentCount;
  2976. incomingCommand->packet = packet;
  2977. incomingCommand->fragments = NULL;
  2978. if (fragmentCount > 0) {
  2979. if (fragmentCount <= ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2980. incomingCommand->fragments = (enet_uint32*)enet_malloc((fragmentCount + 31) / 32 * sizeof(enet_uint32));
  2981. if (incomingCommand->fragments == NULL) {
  2982. enet_free(incomingCommand);
  2983. goto notifyError;
  2984. }
  2985. memset(incomingCommand->fragments, 0, (fragmentCount + 31) / 32 * sizeof(enet_uint32));
  2986. }
  2987. if (packet != NULL) {
  2988. ++packet->referenceCount;
  2989. peer->totalWaitingData += packet->dataLength;
  2990. }
  2991. enet_list_insert(enet_list_next(currentCommand), incomingCommand);
  2992. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2993. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2994. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2995. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  2996. break;
  2997. default:
  2998. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2999. break;
  3000. }
  3001. return incomingCommand;
  3002. discardCommand:
  3003. if (fragmentCount > 0)
  3004. goto notifyError;
  3005. if (packet != NULL && packet->referenceCount == 0)
  3006. enet_packet_destroy(packet);
  3007. return &dummyCommand;
  3008. notifyError:
  3009. if (packet != NULL && packet->referenceCount == 0)
  3010. enet_packet_destroy(packet);
  3011. return NULL;
  3012. }
  3013. /*
  3014. =======================================================================
  3015. Host
  3016. =======================================================================
  3017. */
  3018. ENetHost* enet_host_create(const ENetAddress* address, size_t peerCount, size_t channelLimit, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth, int bufferSize) {
  3019. ENetHost* host;
  3020. ENetPeer* currentPeer;
  3021. if (peerCount > ENET_PROTOCOL_MAXIMUM_PEER_ID)
  3022. return NULL;
  3023. host = (ENetHost*)enet_malloc(sizeof(ENetHost));
  3024. if (host == NULL)
  3025. return NULL;
  3026. memset(host, 0, sizeof(ENetHost));
  3027. host->peers = (ENetPeer*)enet_malloc(peerCount * sizeof(ENetPeer));
  3028. if (host->peers == NULL) {
  3029. enet_free(host);
  3030. return NULL;
  3031. }
  3032. memset(host->peers, 0, peerCount * sizeof(ENetPeer));
  3033. host->socket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
  3034. if (host->socket != ENET_SOCKET_NULL)
  3035. enet_socket_set_option(host->socket, ENET_SOCKOPT_IPV6_V6ONLY, 0);
  3036. if (host->socket == ENET_SOCKET_NULL || (address != NULL && enet_socket_bind(host->socket, address) < 0)) {
  3037. if (host->socket != ENET_SOCKET_NULL)
  3038. enet_socket_destroy(host->socket);
  3039. enet_free(host->peers);
  3040. enet_free(host);
  3041. return NULL;
  3042. }
  3043. if (bufferSize > ENET_HOST_BUFFER_SIZE_MAX)
  3044. bufferSize = ENET_HOST_BUFFER_SIZE_MAX;
  3045. else if (bufferSize < ENET_HOST_BUFFER_SIZE_MIN)
  3046. bufferSize = ENET_HOST_BUFFER_SIZE_MIN;
  3047. enet_socket_set_option(host->socket, ENET_SOCKOPT_NONBLOCK, 1);
  3048. enet_socket_set_option(host->socket, ENET_SOCKOPT_BROADCAST, 1);
  3049. enet_socket_set_option(host->socket, ENET_SOCKOPT_RCVBUF, bufferSize);
  3050. enet_socket_set_option(host->socket, ENET_SOCKOPT_SNDBUF, bufferSize);
  3051. if (address != NULL && enet_socket_get_address(host->socket, &host->address) < 0)
  3052. host->address = *address;
  3053. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3054. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3055. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3056. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3057. host->randomSeed = (enet_uint32)(size_t)host;
  3058. host->randomSeed += enet_host_random_seed();
  3059. host->randomSeed = (host->randomSeed << 16) | (host->randomSeed >> 16);
  3060. host->channelLimit = channelLimit;
  3061. host->incomingBandwidth = incomingBandwidth;
  3062. host->outgoingBandwidth = outgoingBandwidth;
  3063. host->bandwidthThrottleEpoch = 0;
  3064. host->recalculateBandwidthLimits = 0;
  3065. host->preventConnections = 0;
  3066. host->mtu = ENET_HOST_DEFAULT_MTU;
  3067. host->peerCount = peerCount;
  3068. host->commandCount = 0;
  3069. host->bufferCount = 0;
  3070. host->compression = 0;
  3071. host->compressionBufferSize = 0;
  3072. host->checksumCallback = NULL;
  3073. host->receivedAddress.ipv6 = ENET_HOST_ANY;
  3074. host->receivedAddress.port = 0;
  3075. host->receivedData = NULL;
  3076. host->receivedDataLength = 0;
  3077. host->totalSentData = 0;
  3078. host->totalSentPackets = 0;
  3079. host->totalReceivedData = 0;
  3080. host->totalReceivedPackets = 0;
  3081. host->connectedPeers = 0;
  3082. host->bandwidthLimitedPeers = 0;
  3083. host->duplicatePeers = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  3084. host->maximumPacketSize = ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE;
  3085. host->maximumWaitingData = ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA;
  3086. host->interceptCallback = NULL;
  3087. enet_list_clear(&host->dispatchQueue);
  3088. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3089. currentPeer->host = host;
  3090. currentPeer->incomingPeerID = currentPeer - host->peers;
  3091. currentPeer->outgoingSessionID = currentPeer->incomingSessionID = 0xFF;
  3092. currentPeer->data = NULL;
  3093. enet_list_clear(&currentPeer->acknowledgements);
  3094. enet_list_clear(&currentPeer->sentReliableCommands);
  3095. enet_list_clear(&currentPeer->sentUnreliableCommands);
  3096. enet_list_clear(&currentPeer->outgoingReliableCommands);
  3097. enet_list_clear(&currentPeer->outgoingUnreliableCommands);
  3098. enet_list_clear(&currentPeer->dispatchedCommands);
  3099. enet_peer_reset(currentPeer);
  3100. }
  3101. ENET_LOG_TRACE("host created successfully\n");
  3102. return host;
  3103. }
  3104. void enet_host_destroy(ENetHost* host) {
  3105. ENetPeer* currentPeer;
  3106. if (host == NULL)
  3107. return;
  3108. enet_socket_destroy(host->socket);
  3109. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3110. enet_peer_reset(currentPeer);
  3111. }
  3112. enet_free(host->peers);
  3113. enet_free(host->compressionBuffer);
  3114. enet_free(host);
  3115. }
  3116. void enet_host_enable_compression(ENetHost* host) {
  3117. if (host == NULL)
  3118. return;
  3119. host->compression = 1;
  3120. }
  3121. void enet_host_prevent_connections(ENetHost* host, enet_uint8 state) {
  3122. if (host == NULL)
  3123. return;
  3124. host->preventConnections = state;
  3125. }
  3126. ENetPeer* enet_host_connect(ENetHost* host, const ENetAddress* address, size_t channelCount, enet_uint32 data) {
  3127. ENetPeer* currentPeer;
  3128. ENetChannel* channel;
  3129. ENetProtocol command;
  3130. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3131. channelCount = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3132. else if (channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3133. channelCount = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3134. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3135. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED)
  3136. break;
  3137. }
  3138. if (currentPeer >= &host->peers[host->peerCount])
  3139. return NULL;
  3140. currentPeer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  3141. if (currentPeer->channels == NULL)
  3142. return NULL;
  3143. currentPeer->channelCount = channelCount;
  3144. currentPeer->state = ENET_PEER_STATE_CONNECTING;
  3145. currentPeer->address = *address;
  3146. currentPeer->connectID = ++host->randomSeed;
  3147. if (host->outgoingBandwidth == 0)
  3148. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3149. else
  3150. currentPeer->windowSize = (host->outgoingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3151. if (currentPeer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  3152. currentPeer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3153. else if (currentPeer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  3154. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3155. for (channel = currentPeer->channels; channel < &currentPeer->channels[channelCount]; ++channel) {
  3156. channel->outgoingReliableSequenceNumber = 0;
  3157. channel->outgoingUnreliableSequenceNumber = 0;
  3158. channel->incomingReliableSequenceNumber = 0;
  3159. channel->incomingUnreliableSequenceNumber = 0;
  3160. enet_list_clear(&channel->incomingReliableCommands);
  3161. enet_list_clear(&channel->incomingUnreliableCommands);
  3162. channel->usedReliableWindows = 0;
  3163. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  3164. }
  3165. command.header.command = ENET_PROTOCOL_COMMAND_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3166. command.header.channelID = 0xFF;
  3167. command.connect.outgoingPeerID = ENET_HOST_TO_NET_16(currentPeer->incomingPeerID);
  3168. command.connect.incomingSessionID = currentPeer->incomingSessionID;
  3169. command.connect.outgoingSessionID = currentPeer->outgoingSessionID;
  3170. command.connect.mtu = ENET_HOST_TO_NET_32(currentPeer->mtu);
  3171. command.connect.windowSize = ENET_HOST_TO_NET_32(currentPeer->windowSize);
  3172. command.connect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  3173. command.connect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  3174. command.connect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3175. command.connect.packetThrottleInterval = ENET_HOST_TO_NET_32(currentPeer->packetThrottleInterval);
  3176. command.connect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleAcceleration);
  3177. command.connect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleDeceleration);
  3178. command.connect.connectID = currentPeer->connectID;
  3179. command.connect.data = ENET_HOST_TO_NET_32(data);
  3180. enet_peer_queue_outgoing_command(currentPeer, &command, NULL, 0, 0);
  3181. return currentPeer;
  3182. }
  3183. void enet_host_broadcast(ENetHost* host, enet_uint8 channelID, ENetPacket* packet) {
  3184. ENetPeer* currentPeer;
  3185. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3186. ++packet->referenceCount;
  3187. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3188. if (currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3189. continue;
  3190. enet_peer_send(currentPeer, channelID, packet);
  3191. }
  3192. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3193. --packet->referenceCount;
  3194. if (packet->referenceCount == 0)
  3195. enet_packet_destroy(packet);
  3196. }
  3197. void enet_host_broadcast_exclude(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer* excludedPeer) {
  3198. ENetPeer* currentPeer;
  3199. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3200. ++packet->referenceCount;
  3201. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3202. if (currentPeer->state != ENET_PEER_STATE_CONNECTED || currentPeer == excludedPeer)
  3203. continue;
  3204. enet_peer_send(currentPeer, channelID, packet);
  3205. }
  3206. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3207. --packet->referenceCount;
  3208. if (packet->referenceCount == 0)
  3209. enet_packet_destroy(packet);
  3210. }
  3211. void enet_host_broadcast_selective(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer** peers, size_t length) {
  3212. ENetPeer* currentPeer;
  3213. size_t i;
  3214. if (host == NULL)
  3215. return;
  3216. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3217. ++packet->referenceCount;
  3218. for (i = 0; i < length; i++) {
  3219. currentPeer = peers[i];
  3220. if (currentPeer == NULL || currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3221. continue;
  3222. enet_peer_send(currentPeer, channelID, packet);
  3223. }
  3224. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3225. --packet->referenceCount;
  3226. if (packet->referenceCount == 0)
  3227. enet_packet_destroy(packet);
  3228. }
  3229. void enet_host_channel_limit(ENetHost* host, size_t channelLimit) {
  3230. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3231. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3232. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3233. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3234. host->channelLimit = channelLimit;
  3235. }
  3236. void enet_host_bandwidth_limit(ENetHost* host, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth) {
  3237. host->incomingBandwidth = incomingBandwidth;
  3238. host->outgoingBandwidth = outgoingBandwidth;
  3239. host->recalculateBandwidthLimits = 1;
  3240. }
  3241. void enet_host_bandwidth_throttle(ENetHost* host) {
  3242. enet_uint32 timeCurrent = enet_time_get();
  3243. enet_uint32 elapsedTime = timeCurrent - host->bandwidthThrottleEpoch;
  3244. enet_uint32 peersRemaining = (enet_uint32)host->connectedPeers;
  3245. enet_uint32 dataTotal = ~0;
  3246. enet_uint32 bandwidth = ~0;
  3247. enet_uint32 throttle = 0;
  3248. enet_uint32 bandwidthLimit = 0;
  3249. int needsAdjustment = host->bandwidthLimitedPeers > 0 ? 1 : 0;
  3250. ENetPeer* peer;
  3251. ENetProtocol command;
  3252. if (elapsedTime < ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  3253. return;
  3254. if (host->outgoingBandwidth == 0 && host->incomingBandwidth == 0)
  3255. return;
  3256. host->bandwidthThrottleEpoch = timeCurrent;
  3257. if (peersRemaining == 0)
  3258. return;
  3259. if (host->outgoingBandwidth != 0) {
  3260. dataTotal = 0;
  3261. bandwidth = (host->outgoingBandwidth * elapsedTime) / 1000;
  3262. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3263. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3264. continue;
  3265. dataTotal += peer->outgoingDataTotal;
  3266. }
  3267. }
  3268. while (peersRemaining > 0 && needsAdjustment != 0) {
  3269. needsAdjustment = 0;
  3270. if (dataTotal <= bandwidth)
  3271. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3272. else
  3273. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3274. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3275. enet_uint32 peerBandwidth;
  3276. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidth == 0 || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3277. continue;
  3278. peerBandwidth = (peer->incomingBandwidth * elapsedTime) / 1000;
  3279. if ((throttle * peer->outgoingDataTotal) / ENET_PEER_PACKET_THROTTLE_SCALE <= peerBandwidth)
  3280. continue;
  3281. peer->packetThrottleLimit = (peerBandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / peer->outgoingDataTotal;
  3282. if (peer->packetThrottleLimit == 0)
  3283. peer->packetThrottleLimit = 1;
  3284. if (peer->packetThrottle > peer->packetThrottleLimit)
  3285. peer->packetThrottle = peer->packetThrottleLimit;
  3286. peer->outgoingBandwidthThrottleEpoch = timeCurrent;
  3287. peer->incomingDataTotal = 0;
  3288. peer->outgoingDataTotal = 0;
  3289. needsAdjustment = 1;
  3290. --peersRemaining;
  3291. bandwidth -= peerBandwidth;
  3292. dataTotal -= peerBandwidth;
  3293. }
  3294. }
  3295. if (peersRemaining > 0) {
  3296. if (dataTotal <= bandwidth)
  3297. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3298. else
  3299. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3300. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3301. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3302. continue;
  3303. peer->packetThrottleLimit = throttle;
  3304. if (peer->packetThrottle > peer->packetThrottleLimit)
  3305. peer->packetThrottle = peer->packetThrottleLimit;
  3306. peer->incomingDataTotal = 0;
  3307. peer->outgoingDataTotal = 0;
  3308. }
  3309. }
  3310. if (host->recalculateBandwidthLimits) {
  3311. host->recalculateBandwidthLimits = 0;
  3312. peersRemaining = (enet_uint32)host->connectedPeers;
  3313. bandwidth = host->incomingBandwidth;
  3314. needsAdjustment = 1;
  3315. if (bandwidth == 0) {
  3316. bandwidthLimit = 0;
  3317. } else {
  3318. while (peersRemaining > 0 && needsAdjustment != 0) {
  3319. needsAdjustment = 0;
  3320. bandwidthLimit = bandwidth / peersRemaining;
  3321. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3322. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3323. continue;
  3324. if (peer->outgoingBandwidth > 0 && peer->outgoingBandwidth >= bandwidthLimit)
  3325. continue;
  3326. peer->incomingBandwidthThrottleEpoch = timeCurrent;
  3327. needsAdjustment = 1;
  3328. --peersRemaining;
  3329. bandwidth -= peer->outgoingBandwidth;
  3330. }
  3331. }
  3332. }
  3333. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3334. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3335. continue;
  3336. command.header.command = ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3337. command.header.channelID = 0xFF;
  3338. command.bandwidthLimit.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3339. if (peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3340. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(peer->outgoingBandwidth);
  3341. else
  3342. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(bandwidthLimit);
  3343. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  3344. }
  3345. }
  3346. }
  3347. /*
  3348. =======================================================================
  3349. Address
  3350. =======================================================================
  3351. */
  3352. int enet_address_set_host_ip(ENetAddress* address, const char* ip) {
  3353. int type = AF_INET6;
  3354. void* destination = &address->ipv6;
  3355. if (strchr(ip, ':') == NULL) {
  3356. type = AF_INET;
  3357. address->ipv4.ffff = 0xFFFF;
  3358. destination = &address->ipv4.ip;
  3359. }
  3360. if (!inet_pton(type, ip, destination))
  3361. return -1;
  3362. return 0;
  3363. }
  3364. int enet_address_set_host(ENetAddress* address, const char* name) {
  3365. struct addrinfo hints, *resultList = NULL, *result = NULL;
  3366. memset(&hints, 0, sizeof(hints));
  3367. hints.ai_family = AF_UNSPEC;
  3368. if (getaddrinfo(name, NULL, &hints, &resultList) != 0)
  3369. return -1;
  3370. for (result = resultList; result != NULL; result = result->ai_next) {
  3371. if (result->ai_addr != NULL && result->ai_addrlen >= sizeof(struct sockaddr_in)) {
  3372. if (result->ai_family == AF_INET) {
  3373. struct sockaddr_in* sin = (struct sockaddr_in*)result->ai_addr;
  3374. memset(address, 0, sizeof(address->ipv4.zeros));
  3375. address->ipv4.ffff = 0xFFFF;
  3376. address->ipv4.ip.s_addr = sin->sin_addr.s_addr;
  3377. freeaddrinfo(resultList);
  3378. return 0;
  3379. } else if (result->ai_family == AF_INET6) {
  3380. struct sockaddr_in6* sin = (struct sockaddr_in6*)result->ai_addr;
  3381. address->ipv6 = sin->sin6_addr;
  3382. freeaddrinfo(resultList);
  3383. return 0;
  3384. }
  3385. }
  3386. }
  3387. if (resultList != NULL)
  3388. freeaddrinfo(resultList);
  3389. return enet_address_set_host_ip(address, name);
  3390. }
  3391. int enet_address_get_host_ip(const ENetAddress* address, char* ip, size_t ipLength) {
  3392. if (inet_ntop(AF_INET6, &address->ipv6, ip, ipLength) == NULL)
  3393. return -1;
  3394. if (enet_array_is_zeroed(address->ipv4.zeros, sizeof(address->ipv4.zeros)) == 0 && address->ipv4.ffff == 0xFFFF)
  3395. enet_string_copy(ip, ip + 7, ipLength);
  3396. return 0;
  3397. }
  3398. int enet_address_get_host(const ENetAddress* address, char* name, size_t nameLength) {
  3399. struct sockaddr_in6 sin;
  3400. int err;
  3401. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3402. sin.sin6_family = AF_INET6;
  3403. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3404. sin.sin6_addr = address->ipv6;
  3405. err = getnameinfo((struct sockaddr*)&sin, sizeof(sin), name, nameLength, NULL, 0, NI_NAMEREQD);
  3406. if (!err) {
  3407. if (name != NULL && nameLength > 0 && !memchr(name, '\0', nameLength))
  3408. return -1;
  3409. return 0;
  3410. }
  3411. if (err != EAI_NONAME)
  3412. return -1;
  3413. return enet_address_get_host_ip(address, name, nameLength);
  3414. }
  3415. /*
  3416. =======================================================================
  3417. Platform-specific (Unix)
  3418. =======================================================================
  3419. */
  3420. #ifndef _WIN32
  3421. int enet_initialize(void) {
  3422. return 0;
  3423. }
  3424. void enet_deinitialize(void) { }
  3425. enet_uint64 enet_host_random_seed(void) {
  3426. struct timeval timeVal;
  3427. gettimeofday(&timeVal, NULL);
  3428. return (timeVal.tv_sec * 1000) ^ (timeVal.tv_usec / 1000);
  3429. }
  3430. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3431. struct sockaddr_in6 sin;
  3432. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3433. sin.sin6_family = AF_INET6;
  3434. if (address != NULL) {
  3435. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3436. sin.sin6_addr = address->ipv6;
  3437. } else {
  3438. sin.sin6_port = 0;
  3439. sin.sin6_addr = ENET_HOST_ANY;
  3440. }
  3441. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3442. }
  3443. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3444. struct sockaddr_in6 sin;
  3445. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3446. if (getsockname(socket, (struct sockaddr*)&sin, &sinLength) == -1)
  3447. return -1;
  3448. address->ipv6 = sin.sin6_addr;
  3449. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3450. return 0;
  3451. }
  3452. int enet_socket_listen(ENetSocket socket, int backlog) {
  3453. return listen(socket, backlog < 0 ? SOMAXCONN : backlog);
  3454. }
  3455. ENetSocket enet_socket_create(ENetSocketType type) {
  3456. int socketType = (type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM);
  3457. #ifdef SOCK_CLOEXEC
  3458. socketType |= SOCK_CLOEXEC;
  3459. #endif
  3460. return socket(PF_INET6, socketType, 0);
  3461. }
  3462. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3463. int result = -1;
  3464. switch (option) {
  3465. case ENET_SOCKOPT_NONBLOCK:
  3466. result = fcntl(socket, F_SETFL, (value ? O_NONBLOCK : 0) | (fcntl(socket, F_GETFL) & ~O_NONBLOCK));
  3467. break;
  3468. case ENET_SOCKOPT_BROADCAST:
  3469. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3470. break;
  3471. case ENET_SOCKOPT_REUSEADDR:
  3472. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3473. break;
  3474. case ENET_SOCKOPT_RCVBUF:
  3475. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3476. break;
  3477. case ENET_SOCKOPT_SNDBUF:
  3478. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3479. break;
  3480. case ENET_SOCKOPT_RCVTIMEO: {
  3481. struct timeval timeVal;
  3482. timeVal.tv_sec = value / 1000;
  3483. timeVal.tv_usec = (value % 1000) * 1000;
  3484. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3485. break;
  3486. }
  3487. case ENET_SOCKOPT_SNDTIMEO: {
  3488. struct timeval timeVal;
  3489. timeVal.tv_sec = value / 1000;
  3490. timeVal.tv_usec = (value % 1000) * 1000;
  3491. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3492. break;
  3493. }
  3494. case ENET_SOCKOPT_NODELAY:
  3495. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3496. break;
  3497. case ENET_SOCKOPT_IPV6_V6ONLY:
  3498. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3499. break;
  3500. default:
  3501. break;
  3502. }
  3503. return result == -1 ? -1 : 0;
  3504. }
  3505. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3506. int result = -1;
  3507. socklen_t len;
  3508. switch (option) {
  3509. case ENET_SOCKOPT_ERROR:
  3510. len = sizeof(int);
  3511. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, value, &len);
  3512. break;
  3513. default:
  3514. break;
  3515. }
  3516. return result == -1 ? -1 : 0;
  3517. }
  3518. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3519. int result = -1;
  3520. struct sockaddr_in6 sin;
  3521. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3522. sin.sin6_family = AF_INET6;
  3523. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3524. sin.sin6_addr = address->ipv6;
  3525. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3526. if (result == -1 && errno == EINPROGRESS)
  3527. return 0;
  3528. return result;
  3529. }
  3530. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3531. int result = -1;
  3532. struct sockaddr_in6 sin;
  3533. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3534. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3535. if (result == -1)
  3536. return ENET_SOCKET_NULL;
  3537. if (address != NULL) {
  3538. address->ipv6 = sin.sin6_addr;
  3539. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3540. }
  3541. return result;
  3542. }
  3543. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3544. return shutdown(socket, (int)how);
  3545. }
  3546. void enet_socket_destroy(ENetSocket socket) {
  3547. if (socket != ENET_SOCKET_NULL)
  3548. close(socket);
  3549. }
  3550. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3551. struct msghdr msgHdr;
  3552. struct sockaddr_in6 sin;
  3553. int sentLength;
  3554. memset(&msgHdr, 0, sizeof(struct msghdr));
  3555. if (address != NULL) {
  3556. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3557. sin.sin6_family = AF_INET6;
  3558. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3559. sin.sin6_addr = address->ipv6;
  3560. msgHdr.msg_name = &sin;
  3561. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3562. }
  3563. msgHdr.msg_iov = (struct iovec*)buffers;
  3564. msgHdr.msg_iovlen = bufferCount;
  3565. sentLength = sendmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3566. if (sentLength == -1) {
  3567. if (errno == EWOULDBLOCK)
  3568. return 0;
  3569. return -1;
  3570. }
  3571. return sentLength;
  3572. }
  3573. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3574. struct msghdr msgHdr;
  3575. struct sockaddr_in6 sin;
  3576. int recvLength;
  3577. memset(&msgHdr, 0, sizeof(struct msghdr));
  3578. if (address != NULL) {
  3579. msgHdr.msg_name = &sin;
  3580. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3581. }
  3582. msgHdr.msg_iov = (struct iovec*)buffers;
  3583. msgHdr.msg_iovlen = bufferCount;
  3584. recvLength = recvmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3585. if (recvLength == -1) {
  3586. if (errno == EWOULDBLOCK)
  3587. return 0;
  3588. return -1;
  3589. }
  3590. if (msgHdr.msg_flags & MSG_TRUNC)
  3591. return -1;
  3592. if (address != NULL) {
  3593. address->ipv6 = sin.sin6_addr;
  3594. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3595. }
  3596. return recvLength;
  3597. }
  3598. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3599. struct timeval timeVal;
  3600. timeVal.tv_sec = timeout / 1000;
  3601. timeVal.tv_usec = (timeout % 1000) * 1000;
  3602. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3603. }
  3604. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3605. struct pollfd pollSocket;
  3606. int pollCount;
  3607. pollSocket.fd = socket;
  3608. pollSocket.events = 0;
  3609. if (*condition & ENET_SOCKET_WAIT_SEND)
  3610. pollSocket.events |= POLLOUT;
  3611. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3612. pollSocket.events |= POLLIN;
  3613. pollCount = poll(&pollSocket, 1, timeout);
  3614. if (pollCount < 0) {
  3615. if (errno == EINTR && *condition & ENET_SOCKET_WAIT_INTERRUPT) {
  3616. *condition = ENET_SOCKET_WAIT_INTERRUPT;
  3617. return 0;
  3618. }
  3619. return -1;
  3620. }
  3621. *condition = ENET_SOCKET_WAIT_NONE;
  3622. if (pollCount == 0)
  3623. return 0;
  3624. if (pollSocket.revents & POLLOUT)
  3625. *condition |= ENET_SOCKET_WAIT_SEND;
  3626. if (pollSocket.revents & POLLIN)
  3627. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3628. return 0;
  3629. }
  3630. #endif
  3631. /*
  3632. =======================================================================
  3633. Platform-specific (Windows)
  3634. =======================================================================
  3635. */
  3636. #ifdef _WIN32
  3637. int enet_initialize(void) {
  3638. WORD versionRequested = MAKEWORD(2, 2);
  3639. WSADATA wsaData;
  3640. if (WSAStartup(versionRequested, &wsaData))
  3641. return -1;
  3642. if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
  3643. WSACleanup();
  3644. return -1;
  3645. }
  3646. timeBeginPeriod(1);
  3647. return 0;
  3648. }
  3649. void enet_deinitialize(void) {
  3650. timeEndPeriod(1);
  3651. WSACleanup();
  3652. }
  3653. enet_uint64 enet_host_random_seed(void) {
  3654. return (enet_uint64)timeGetTime();
  3655. }
  3656. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3657. struct sockaddr_in6 sin;
  3658. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3659. sin.sin6_family = AF_INET6;
  3660. if (address != NULL) {
  3661. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3662. sin.sin6_addr = address->ipv6;
  3663. } else {
  3664. sin.sin6_port = 0;
  3665. sin.sin6_addr = in6addr_any;
  3666. }
  3667. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)) == SOCKET_ERROR ? -1 : 0;
  3668. }
  3669. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3670. struct sockaddr_in6 sin;
  3671. int sinLength = sizeof(struct sockaddr_in6);
  3672. if (getsockname(socket, (struct sockaddr*)&sin, &sinLength) == -1)
  3673. return -1;
  3674. address->ipv6 = sin.sin6_addr;
  3675. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3676. return 0;
  3677. }
  3678. int enet_socket_listen(ENetSocket socket, int backlog) {
  3679. return listen(socket, backlog < 0 ? SOMAXCONN : backlog) == SOCKET_ERROR ? -1 : 0;
  3680. }
  3681. ENetSocket enet_socket_create(ENetSocketType type) {
  3682. return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
  3683. }
  3684. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3685. int result = SOCKET_ERROR;
  3686. switch (option) {
  3687. case ENET_SOCKOPT_NONBLOCK: {
  3688. u_long nonBlocking = (u_long)value;
  3689. result = ioctlsocket(socket, FIONBIO, &nonBlocking);
  3690. break;
  3691. }
  3692. case ENET_SOCKOPT_BROADCAST:
  3693. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3694. break;
  3695. case ENET_SOCKOPT_REUSEADDR:
  3696. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3697. break;
  3698. case ENET_SOCKOPT_RCVBUF:
  3699. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3700. break;
  3701. case ENET_SOCKOPT_SNDBUF:
  3702. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3703. break;
  3704. case ENET_SOCKOPT_RCVTIMEO:
  3705. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&value, sizeof(int));
  3706. break;
  3707. case ENET_SOCKOPT_SNDTIMEO:
  3708. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&value, sizeof(int));
  3709. break;
  3710. case ENET_SOCKOPT_NODELAY:
  3711. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3712. break;
  3713. case ENET_SOCKOPT_IPV6_V6ONLY:
  3714. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3715. break;
  3716. default:
  3717. break;
  3718. }
  3719. return result == SOCKET_ERROR ? -1 : 0;
  3720. }
  3721. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3722. int result = SOCKET_ERROR, len;
  3723. switch (option) {
  3724. case ENET_SOCKOPT_ERROR:
  3725. len = sizeof(int);
  3726. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, (char*)value, &len);
  3727. break;
  3728. default:
  3729. break;
  3730. }
  3731. return result == SOCKET_ERROR ? -1 : 0;
  3732. }
  3733. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3734. int result = -1;
  3735. struct sockaddr_in6 sin;
  3736. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3737. sin.sin6_family = AF_INET6;
  3738. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3739. sin.sin6_addr = address->ipv6;
  3740. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3741. if (result == SOCKET_ERROR && WSAGetLastError() != WSAEWOULDBLOCK)
  3742. return -1;
  3743. return 0;
  3744. }
  3745. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3746. SOCKET result;
  3747. struct sockaddr_in6 sin;
  3748. int sinLength = sizeof(struct sockaddr_in6);
  3749. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3750. if (result == INVALID_SOCKET)
  3751. return ENET_SOCKET_NULL;
  3752. if (address != NULL) {
  3753. address->ipv6 = sin.sin6_addr;
  3754. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3755. }
  3756. return result;
  3757. }
  3758. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3759. return shutdown(socket, (int)how) == SOCKET_ERROR ? -1 : 0;
  3760. }
  3761. void enet_socket_destroy(ENetSocket socket) {
  3762. if (socket != INVALID_SOCKET)
  3763. closesocket(socket);
  3764. }
  3765. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3766. struct sockaddr_in6 sin;
  3767. DWORD sentLength;
  3768. if (address != NULL) {
  3769. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3770. sin.sin6_family = AF_INET6;
  3771. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3772. sin.sin6_addr = address->ipv6;
  3773. }
  3774. 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)
  3775. return (WSAGetLastError() == WSAEWOULDBLOCK) ? 0 : -1;
  3776. return (int)sentLength;
  3777. }
  3778. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3779. INT sinLength = sizeof(struct sockaddr_in6);
  3780. DWORD flags = 0, recvLength;
  3781. struct sockaddr_in6 sin;
  3782. if (WSARecvFrom(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &recvLength, &flags, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL, NULL, NULL) == SOCKET_ERROR) {
  3783. switch (WSAGetLastError()) {
  3784. case WSAEWOULDBLOCK:
  3785. case WSAECONNRESET:
  3786. return 0;
  3787. }
  3788. return -1;
  3789. }
  3790. if (flags & MSG_PARTIAL)
  3791. return -1;
  3792. if (address != NULL) {
  3793. address->ipv6 = sin.sin6_addr;
  3794. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3795. }
  3796. return (int)recvLength;
  3797. }
  3798. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3799. struct timeval timeVal;
  3800. timeVal.tv_sec = timeout / 1000;
  3801. timeVal.tv_usec = (timeout % 1000) * 1000;
  3802. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3803. }
  3804. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3805. fd_set readSet, writeSet;
  3806. struct timeval timeVal;
  3807. int selectCount;
  3808. timeVal.tv_sec = timeout / 1000;
  3809. timeVal.tv_usec = (timeout % 1000) * 1000;
  3810. FD_ZERO(&readSet);
  3811. FD_ZERO(&writeSet);
  3812. if (*condition & ENET_SOCKET_WAIT_SEND)
  3813. FD_SET(socket, &writeSet);
  3814. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3815. FD_SET(socket, &readSet);
  3816. selectCount = select(socket + 1, &readSet, &writeSet, NULL, &timeVal);
  3817. if (selectCount < 0)
  3818. return -1;
  3819. *condition = ENET_SOCKET_WAIT_NONE;
  3820. if (selectCount == 0)
  3821. return 0;
  3822. if (FD_ISSET(socket, &writeSet))
  3823. *condition |= ENET_SOCKET_WAIT_SEND;
  3824. if (FD_ISSET(socket, &readSet))
  3825. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3826. return 0;
  3827. }
  3828. #endif
  3829. /*
  3830. =======================================================================
  3831. Extended functionality
  3832. =======================================================================
  3833. */
  3834. void* enet_packet_get_data(const ENetPacket* packet) {
  3835. return (void*)packet->data;
  3836. }
  3837. int enet_packet_get_length(const ENetPacket* packet) {
  3838. return packet->dataLength;
  3839. }
  3840. void enet_packet_set_free_callback(ENetPacket* packet, const void* callback) {
  3841. packet->freeCallback = (ENetPacketFreeCallback)callback;
  3842. }
  3843. int enet_packet_check_references(const ENetPacket* packet) {
  3844. return (int)packet->referenceCount;
  3845. }
  3846. void enet_packet_dispose(ENetPacket* packet) {
  3847. if (packet->referenceCount == 0)
  3848. enet_packet_destroy(packet);
  3849. }
  3850. enet_uint32 enet_host_get_peers_count(const ENetHost* host) {
  3851. return host->connectedPeers;
  3852. }
  3853. enet_uint32 enet_host_get_packets_sent(const ENetHost* host) {
  3854. return host->totalSentPackets;
  3855. }
  3856. enet_uint32 enet_host_get_packets_received(const ENetHost* host) {
  3857. return host->totalReceivedPackets;
  3858. }
  3859. enet_uint32 enet_host_get_bytes_sent(const ENetHost* host) {
  3860. return host->totalSentData;
  3861. }
  3862. enet_uint32 enet_host_get_bytes_received(const ENetHost* host) {
  3863. return host->totalReceivedData;
  3864. }
  3865. enet_uint32 enet_peer_get_id(const ENetPeer* peer) {
  3866. return peer->incomingPeerID;
  3867. }
  3868. int enet_peer_get_ip(const ENetPeer* peer, char* ip, size_t ipLength) {
  3869. return enet_address_get_host_ip(&peer->address, ip, ipLength);
  3870. }
  3871. enet_uint16 enet_peer_get_port(const ENetPeer* peer) {
  3872. return peer->address.port;
  3873. }
  3874. enet_uint32 enet_peer_get_mtu(const ENetPeer* peer) {
  3875. return peer->mtu;
  3876. }
  3877. ENetPeerState enet_peer_get_state(const ENetPeer* peer) {
  3878. return peer->state;
  3879. }
  3880. enet_uint32 enet_peer_get_rtt(const ENetPeer* peer) {
  3881. return peer->smoothedRoundTripTime;
  3882. }
  3883. enet_uint32 enet_peer_get_lastsendtime(const ENetPeer* peer) {
  3884. return peer->lastSendTime;
  3885. }
  3886. enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer* peer) {
  3887. return peer->lastReceiveTime;
  3888. }
  3889. enet_uint64 enet_peer_get_packets_sent(const ENetPeer* peer) {
  3890. return peer->totalPacketsSent;
  3891. }
  3892. enet_uint64 enet_peer_get_packets_lost(const ENetPeer* peer) {
  3893. return peer->totalPacketsLost;
  3894. }
  3895. enet_uint64 enet_peer_get_bytes_sent(const ENetPeer* peer) {
  3896. return peer->totalDataSent;
  3897. }
  3898. enet_uint64 enet_peer_get_bytes_received(const ENetPeer* peer) {
  3899. return peer->totalDataReceived;
  3900. }
  3901. void* enet_peer_get_data(const ENetPeer* peer) {
  3902. return (void*)peer->data;
  3903. }
  3904. void enet_peer_set_data(ENetPeer* peer, const void* data) {
  3905. peer->data = (enet_uint32*)data;
  3906. }
  3907. #ifdef __cplusplus
  3908. }
  3909. #endif
  3910. #endif
  3911. #endif