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