enet.h 173 KB

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