enet.h 172 KB

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  1. /*
  2. * ENet reliable UDP networking library
  3. * Copyright (c) 2018 Lee Salzman, Vladyslav Hrytsenko, Dominik Madarász, Stanislav Denisov
  4. *
  5. * Permission is hereby granted, free of charge, to any person obtaining a copy
  6. * of this software and associated documentation files (the "Software"), to deal
  7. * in the Software without restriction, including without limitation the rights
  8. * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  9. * copies of the Software, and to permit persons to whom the Software is
  10. * furnished to do so, subject to the following conditions:
  11. *
  12. * The above copyright notice and this permission notice shall be included in all
  13. * copies or substantial portions of the Software.
  14. *
  15. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18. * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21. * SOFTWARE.
  22. */
  23. #ifndef ENET_H
  24. #define ENET_H
  25. #include <stdlib.h>
  26. #include <stdbool.h>
  27. #include <stdint.h>
  28. #include <time.h>
  29. #define ENET_VERSION_MAJOR 2
  30. #define ENET_VERSION_MINOR 3
  31. #define ENET_VERSION_PATCH 6
  32. #define ENET_VERSION_CREATE(major, minor, patch) (((major) << 16) | ((minor) << 8) | (patch))
  33. #define ENET_VERSION_GET_MAJOR(version) (((version) >> 16) & 0xFF)
  34. #define ENET_VERSION_GET_MINOR(version) (((version) >> 8) & 0xFF)
  35. #define ENET_VERSION_GET_PATCH(version) ((version) & 0xFF)
  36. #define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH)
  37. #define ENET_TIME_OVERFLOW 86400000
  38. #define ENET_TIME_LESS(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW)
  39. #define ENET_TIME_GREATER(a, b) ((b) - (a) >= ENET_TIME_OVERFLOW)
  40. #define ENET_TIME_LESS_EQUAL(a, b) (!ENET_TIME_GREATER(a, b))
  41. #define ENET_TIME_GREATER_EQUAL(a, b) (!ENET_TIME_LESS(a, b))
  42. #define ENET_TIME_DIFFERENCE(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW ? (b) - (a) : (a) - (b))
  43. #define ENET_MAX(x, y) ((x) > (y) ? (x) : (y))
  44. #define ENET_MIN(x, y) ((x) < (y) ? (x) : (y))
  45. /*
  46. =======================================================================
  47. System differences
  48. =======================================================================
  49. */
  50. #ifdef _WIN32
  51. #ifndef ENET_NO_PRAGMA_LINK
  52. #pragma comment(lib, "ws2_32.lib")
  53. #pragma comment(lib, "winmm.lib")
  54. #endif
  55. #if _MSC_VER >= 1910
  56. /* It looks like there were changes as of Visual Studio 2017 and there are no 32/64 bit
  57. versions of _InterlockedExchange[operation], only InterlockedExchange[operation]
  58. (without leading underscore), so we have to distinguish between compiler versions */
  59. #define NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  60. #endif
  61. #ifdef __GNUC__
  62. #if (_WIN32_WINNT < 0x0501)
  63. #undef _WIN32_WINNT
  64. #define _WIN32_WINNT 0x0501
  65. #endif
  66. #endif
  67. #include <winsock2.h>
  68. #include <ws2tcpip.h>
  69. #include <mmsystem.h>
  70. #include <intrin.h>
  71. #if defined(_WIN32) && defined(_MSC_VER)
  72. #if _MSC_VER < 1900
  73. typedef struct timespec {
  74. long tv_sec;
  75. long tv_nsec;
  76. };
  77. #endif
  78. #define CLOCK_MONOTONIC 0
  79. #endif
  80. typedef SOCKET ENetSocket;
  81. #define ENET_SOCKET_NULL INVALID_SOCKET
  82. typedef struct {
  83. size_t dataLength;
  84. void* data;
  85. } ENetBuffer;
  86. #define ENET_CALLBACK __cdecl
  87. #ifdef ENET_DLL
  88. #ifdef ENET_IMPLEMENTATION
  89. #define ENET_API __declspec(dllexport)
  90. #else
  91. #define ENET_API __declspec(dllimport)
  92. #endif
  93. #else
  94. #define ENET_API extern
  95. #endif
  96. #else
  97. #include <sys/types.h>
  98. #include <sys/ioctl.h>
  99. #include <sys/time.h>
  100. #include <sys/socket.h>
  101. #include <poll.h>
  102. #include <arpa/inet.h>
  103. #include <netinet/in.h>
  104. #include <netinet/tcp.h>
  105. #include <netdb.h>
  106. #include <unistd.h>
  107. #include <string.h>
  108. #include <errno.h>
  109. #include <fcntl.h>
  110. #ifdef __APPLE__
  111. #include <mach/clock.h>
  112. #include <mach/mach.h>
  113. #include <Availability.h>
  114. #endif
  115. #ifndef MSG_NOSIGNAL
  116. #define MSG_NOSIGNAL 0
  117. #endif
  118. #ifdef MSG_MAXIOVLEN
  119. #define ENET_BUFFER_MAXIMUM MSG_MAXIOVLEN
  120. #endif
  121. typedef int ENetSocket;
  122. #define ENET_SOCKET_NULL -1
  123. typedef struct {
  124. void* data;
  125. size_t dataLength;
  126. } ENetBuffer;
  127. #define ENET_CALLBACK
  128. #define ENET_API extern
  129. #endif
  130. #ifndef ENET_BUFFER_MAXIMUM
  131. #define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS)
  132. #endif
  133. #define ENET_HOST_ANY in6addr_any
  134. #define ENET_PORT_ANY 0
  135. #define ENET_HOST_SIZE 1025
  136. #define ENET_HOST_TO_NET_16(value) (htons(value))
  137. #define ENET_HOST_TO_NET_32(value) (htonl(value))
  138. #define ENET_NET_TO_HOST_16(value) (ntohs(value))
  139. #define ENET_NET_TO_HOST_32(value) (ntohl(value))
  140. #ifdef __cplusplus
  141. extern "C" {
  142. #endif
  143. /*
  144. =======================================================================
  145. Internals
  146. =======================================================================
  147. */
  148. typedef uint8_t enet_uint8;
  149. typedef uint16_t enet_uint16;
  150. typedef uint32_t enet_uint32;
  151. typedef uint64_t enet_uint64;
  152. typedef enet_uint32 ENetVersion;
  153. typedef fd_set ENetSocketSet;
  154. typedef struct _ENetCallbacks {
  155. void* (ENET_CALLBACK *malloc)(size_t size);
  156. void (ENET_CALLBACK *free)(void* memory);
  157. void (ENET_CALLBACK *noMemory)(void);
  158. } ENetCallbacks;
  159. extern void* enet_malloc(size_t);
  160. extern void enet_free(void*);
  161. typedef struct _ENetListNode {
  162. struct _ENetListNode* next;
  163. struct _ENetListNode* previous;
  164. } ENetListNode;
  165. typedef ENetListNode* ENetListIterator;
  166. typedef struct _ENetList {
  167. ENetListNode sentinel;
  168. } ENetList;
  169. extern ENetListIterator enet_list_insert(ENetListIterator, void*);
  170. extern ENetListIterator enet_list_move(ENetListIterator, void*, void*);
  171. extern void* enet_list_remove(ENetListIterator);
  172. extern void enet_list_clear(ENetList*);
  173. extern size_t enet_list_size(ENetList*);
  174. #define enet_list_begin(list) ((list)->sentinel.next)
  175. #define enet_list_end(list) (&(list)->sentinel)
  176. #define enet_list_empty(list) (enet_list_begin(list) == enet_list_end(list))
  177. #define enet_list_next(iterator) ((iterator)->next)
  178. #define enet_list_previous(iterator) ((iterator)->previous)
  179. #define enet_list_front(list) ((void*)(list)->sentinel.next)
  180. #define enet_list_back(list) ((void*)(list)->sentinel.previous)
  181. #define enet_in6_equal(a, b) (memcmp(&a, &b, sizeof(struct in6_addr)) == 0)
  182. /*
  183. =======================================================================
  184. Protocol
  185. =======================================================================
  186. */
  187. enum {
  188. ENET_PROTOCOL_MINIMUM_MTU = 576,
  189. ENET_PROTOCOL_MAXIMUM_MTU = 4096,
  190. ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS = 32,
  191. ENET_PROTOCOL_MINIMUM_WINDOW_SIZE = 4096,
  192. ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE = 65536,
  193. ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT = 1,
  194. ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT = 255,
  195. ENET_PROTOCOL_MAXIMUM_PEER_ID = 0xFFF,
  196. ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT = 1024 * 1024
  197. };
  198. typedef enum _ENetProtocolCommand {
  199. ENET_PROTOCOL_COMMAND_NONE = 0,
  200. ENET_PROTOCOL_COMMAND_ACKNOWLEDGE = 1,
  201. ENET_PROTOCOL_COMMAND_CONNECT = 2,
  202. ENET_PROTOCOL_COMMAND_VERIFY_CONNECT = 3,
  203. ENET_PROTOCOL_COMMAND_DISCONNECT = 4,
  204. ENET_PROTOCOL_COMMAND_PING = 5,
  205. ENET_PROTOCOL_COMMAND_SEND_RELIABLE = 6,
  206. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE = 7,
  207. ENET_PROTOCOL_COMMAND_SEND_FRAGMENT = 8,
  208. ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED = 9,
  209. ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT = 10,
  210. ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE = 11,
  211. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT = 12,
  212. ENET_PROTOCOL_COMMAND_COUNT = 13,
  213. ENET_PROTOCOL_COMMAND_MASK = 0x0F
  214. } ENetProtocolCommand;
  215. typedef enum _ENetProtocolFlag {
  216. ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE = (1 << 7),
  217. ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED = (1 << 6),
  218. ENET_PROTOCOL_HEADER_FLAG_SENT_TIME = (1 << 14),
  219. ENET_PROTOCOL_HEADER_FLAG_MASK = ENET_PROTOCOL_HEADER_FLAG_SENT_TIME,
  220. ENET_PROTOCOL_HEADER_SESSION_MASK = (3 << 12),
  221. ENET_PROTOCOL_HEADER_SESSION_SHIFT = 12
  222. } ENetProtocolFlag;
  223. #ifdef _MSC_VER
  224. #pragma pack(push, 1)
  225. #define ENET_PACKED
  226. #elif defined(__GNUC__) || defined(__clang__)
  227. #define ENET_PACKED __attribute__ ((packed))
  228. #else
  229. #define ENET_PACKED
  230. #endif
  231. typedef struct _ENetProtocolHeader {
  232. enet_uint16 peerID;
  233. enet_uint16 sentTime;
  234. } ENET_PACKED ENetProtocolHeader;
  235. typedef struct _ENetProtocolCommandHeader {
  236. enet_uint8 command;
  237. enet_uint8 channelID;
  238. enet_uint16 reliableSequenceNumber;
  239. } ENET_PACKED ENetProtocolCommandHeader;
  240. typedef struct _ENetProtocolAcknowledge {
  241. ENetProtocolCommandHeader header;
  242. enet_uint16 receivedReliableSequenceNumber;
  243. enet_uint16 receivedSentTime;
  244. } ENET_PACKED ENetProtocolAcknowledge;
  245. typedef struct _ENetProtocolConnect {
  246. ENetProtocolCommandHeader header;
  247. enet_uint16 outgoingPeerID;
  248. enet_uint8 incomingSessionID;
  249. enet_uint8 outgoingSessionID;
  250. enet_uint32 mtu;
  251. enet_uint32 windowSize;
  252. enet_uint32 channelCount;
  253. enet_uint32 incomingBandwidth;
  254. enet_uint32 outgoingBandwidth;
  255. enet_uint32 packetThrottleInterval;
  256. enet_uint32 packetThrottleAcceleration;
  257. enet_uint32 packetThrottleDeceleration;
  258. enet_uint32 connectID;
  259. enet_uint32 data;
  260. } ENET_PACKED ENetProtocolConnect;
  261. typedef struct _ENetProtocolVerifyConnect {
  262. ENetProtocolCommandHeader header;
  263. enet_uint16 outgoingPeerID;
  264. enet_uint8 incomingSessionID;
  265. enet_uint8 outgoingSessionID;
  266. enet_uint32 mtu;
  267. enet_uint32 windowSize;
  268. enet_uint32 channelCount;
  269. enet_uint32 incomingBandwidth;
  270. enet_uint32 outgoingBandwidth;
  271. enet_uint32 packetThrottleInterval;
  272. enet_uint32 packetThrottleAcceleration;
  273. enet_uint32 packetThrottleDeceleration;
  274. enet_uint32 connectID;
  275. } ENET_PACKED ENetProtocolVerifyConnect;
  276. typedef struct _ENetProtocolBandwidthLimit {
  277. ENetProtocolCommandHeader header;
  278. enet_uint32 incomingBandwidth;
  279. enet_uint32 outgoingBandwidth;
  280. } ENET_PACKED ENetProtocolBandwidthLimit;
  281. typedef struct _ENetProtocolThrottleConfigure {
  282. ENetProtocolCommandHeader header;
  283. enet_uint32 packetThrottleInterval;
  284. enet_uint32 packetThrottleAcceleration;
  285. enet_uint32 packetThrottleDeceleration;
  286. } ENET_PACKED ENetProtocolThrottleConfigure;
  287. typedef struct _ENetProtocolDisconnect {
  288. ENetProtocolCommandHeader header;
  289. enet_uint32 data;
  290. } ENET_PACKED ENetProtocolDisconnect;
  291. typedef struct _ENetProtocolPing {
  292. ENetProtocolCommandHeader header;
  293. } ENET_PACKED ENetProtocolPing;
  294. typedef struct _ENetProtocolSendReliable {
  295. ENetProtocolCommandHeader header;
  296. enet_uint16 dataLength;
  297. } ENET_PACKED ENetProtocolSendReliable;
  298. typedef struct _ENetProtocolSendUnreliable {
  299. ENetProtocolCommandHeader header;
  300. enet_uint16 unreliableSequenceNumber;
  301. enet_uint16 dataLength;
  302. } ENET_PACKED ENetProtocolSendUnreliable;
  303. typedef struct _ENetProtocolSendUnsequenced {
  304. ENetProtocolCommandHeader header;
  305. enet_uint16 unsequencedGroup;
  306. enet_uint16 dataLength;
  307. } ENET_PACKED ENetProtocolSendUnsequenced;
  308. typedef struct _ENetProtocolSendFragment {
  309. ENetProtocolCommandHeader header;
  310. enet_uint16 startSequenceNumber;
  311. enet_uint16 dataLength;
  312. enet_uint32 fragmentCount;
  313. enet_uint32 fragmentNumber;
  314. enet_uint32 totalLength;
  315. enet_uint32 fragmentOffset;
  316. } ENET_PACKED ENetProtocolSendFragment;
  317. typedef union _ENetProtocol {
  318. ENetProtocolCommandHeader header;
  319. ENetProtocolAcknowledge acknowledge;
  320. ENetProtocolConnect connect;
  321. ENetProtocolVerifyConnect verifyConnect;
  322. ENetProtocolDisconnect disconnect;
  323. ENetProtocolPing ping;
  324. ENetProtocolSendReliable sendReliable;
  325. ENetProtocolSendUnreliable sendUnreliable;
  326. ENetProtocolSendUnsequenced sendUnsequenced;
  327. ENetProtocolSendFragment sendFragment;
  328. ENetProtocolBandwidthLimit bandwidthLimit;
  329. ENetProtocolThrottleConfigure throttleConfigure;
  330. } ENET_PACKED ENetProtocol;
  331. #ifdef _MSC_VER
  332. #pragma pack(pop)
  333. #endif
  334. /*
  335. =======================================================================
  336. General structs/enums
  337. =======================================================================
  338. */
  339. typedef enum _ENetSocketType {
  340. ENET_SOCKET_TYPE_STREAM = 1,
  341. ENET_SOCKET_TYPE_DATAGRAM = 2
  342. } ENetSocketType;
  343. typedef enum _ENetSocketWait {
  344. ENET_SOCKET_WAIT_NONE = 0,
  345. ENET_SOCKET_WAIT_SEND = (1 << 0),
  346. ENET_SOCKET_WAIT_RECEIVE = (1 << 1),
  347. ENET_SOCKET_WAIT_INTERRUPT = (1 << 2)
  348. } ENetSocketWait;
  349. typedef enum _ENetSocketOption {
  350. ENET_SOCKOPT_NONBLOCK = 1,
  351. ENET_SOCKOPT_BROADCAST = 2,
  352. ENET_SOCKOPT_RCVBUF = 3,
  353. ENET_SOCKOPT_SNDBUF = 4,
  354. ENET_SOCKOPT_REUSEADDR = 5,
  355. ENET_SOCKOPT_RCVTIMEO = 6,
  356. ENET_SOCKOPT_SNDTIMEO = 7,
  357. ENET_SOCKOPT_ERROR = 8,
  358. ENET_SOCKOPT_NODELAY = 9,
  359. ENET_SOCKOPT_IPV6_V6ONLY = 10
  360. } ENetSocketOption;
  361. typedef enum _ENetSocketShutdown {
  362. ENET_SOCKET_SHUTDOWN_READ = 0,
  363. ENET_SOCKET_SHUTDOWN_WRITE = 1,
  364. ENET_SOCKET_SHUTDOWN_READ_WRITE = 2
  365. } ENetSocketShutdown;
  366. typedef struct _ENetAddress {
  367. union {
  368. struct in6_addr ipv6;
  369. struct {
  370. uint8_t zeros[10];
  371. uint16_t ffff;
  372. struct in_addr ip;
  373. } ipv4;
  374. };
  375. uint16_t port;
  376. } ENetAddress;
  377. typedef enum _ENetPacketFlag {
  378. ENET_PACKET_FLAG_NONE = 0,
  379. ENET_PACKET_FLAG_RELIABLE = (1 << 0),
  380. ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1),
  381. ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2),
  382. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED = (1 << 3),
  383. ENET_PACKET_FLAG_INSTANT = (1 << 4),
  384. ENET_PACKET_FLAG_CRUCIAL = (1 << 5),
  385. ENET_PACKET_FLAG_SENT = (1 << 8)
  386. } ENetPacketFlag;
  387. typedef void (ENET_CALLBACK *ENetPacketFreeCallback)(void*);
  388. typedef struct _ENetPacket {
  389. enet_uint32 flags;
  390. enet_uint32 dataLength;
  391. enet_uint8* data;
  392. ENetPacketFreeCallback freeCallback;
  393. enet_uint32 referenceCount;
  394. void* userData;
  395. } ENetPacket;
  396. typedef struct _ENetAcknowledgement {
  397. ENetListNode acknowledgementList;
  398. enet_uint32 sentTime;
  399. ENetProtocol command;
  400. } ENetAcknowledgement;
  401. typedef struct _ENetOutgoingCommand {
  402. ENetListNode outgoingCommandList;
  403. enet_uint16 reliableSequenceNumber;
  404. enet_uint16 unreliableSequenceNumber;
  405. enet_uint32 sentTime;
  406. enet_uint32 roundTripTimeout;
  407. enet_uint32 roundTripTimeoutLimit;
  408. enet_uint32 fragmentOffset;
  409. enet_uint16 fragmentLength;
  410. enet_uint16 sendAttempts;
  411. ENetProtocol command;
  412. ENetPacket* packet;
  413. } ENetOutgoingCommand;
  414. typedef struct _ENetIncomingCommand {
  415. ENetListNode incomingCommandList;
  416. enet_uint16 reliableSequenceNumber;
  417. enet_uint16 unreliableSequenceNumber;
  418. ENetProtocol command;
  419. enet_uint32 fragmentCount;
  420. enet_uint32 fragmentsRemaining;
  421. enet_uint32* fragments;
  422. ENetPacket* packet;
  423. } ENetIncomingCommand;
  424. typedef enum _ENetPeerState {
  425. ENET_PEER_STATE_DISCONNECTED = 0,
  426. ENET_PEER_STATE_CONNECTING = 1,
  427. ENET_PEER_STATE_ACKNOWLEDGING_CONNECT = 2,
  428. ENET_PEER_STATE_CONNECTION_PENDING = 3,
  429. ENET_PEER_STATE_CONNECTION_SUCCEEDED = 4,
  430. ENET_PEER_STATE_CONNECTED = 5,
  431. ENET_PEER_STATE_DISCONNECT_LATER = 6,
  432. ENET_PEER_STATE_DISCONNECTING = 7,
  433. ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT = 8,
  434. ENET_PEER_STATE_ZOMBIE = 9
  435. } ENetPeerState;
  436. enum {
  437. ENET_HOST_BUFFER_SIZE_MIN = 256 * 1024,
  438. ENET_HOST_BUFFER_SIZE_MAX = 1024 * 1024,
  439. ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000,
  440. ENET_HOST_DEFAULT_MTU = 1280,
  441. ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024,
  442. ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
  443. ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 500,
  444. ENET_PEER_DEFAULT_PACKET_THROTTLE = 32,
  445. ENET_PEER_PACKET_THROTTLE_THRESHOLD = 20,
  446. ENET_PEER_PACKET_THROTTLE_SCALE = 32,
  447. ENET_PEER_PACKET_THROTTLE_COUNTER = 7,
  448. ENET_PEER_PACKET_THROTTLE_ACCELERATION = 2,
  449. ENET_PEER_PACKET_THROTTLE_DECELERATION = 2,
  450. ENET_PEER_PACKET_THROTTLE_INTERVAL = 5000,
  451. ENET_PEER_PACKET_LOSS_SCALE = (1 << 16),
  452. ENET_PEER_PACKET_LOSS_INTERVAL = 10000,
  453. ENET_PEER_WINDOW_SIZE_SCALE = 64 * 1024,
  454. ENET_PEER_TIMEOUT_LIMIT = 32,
  455. ENET_PEER_TIMEOUT_MINIMUM = 5000,
  456. ENET_PEER_TIMEOUT_MAXIMUM = 30000,
  457. ENET_PEER_PING_INTERVAL = 500,
  458. ENET_PEER_UNSEQUENCED_WINDOWS = 64,
  459. ENET_PEER_UNSEQUENCED_WINDOW_SIZE = 1024,
  460. ENET_PEER_FREE_UNSEQUENCED_WINDOWS = 32,
  461. ENET_PEER_RELIABLE_WINDOWS = 16,
  462. ENET_PEER_RELIABLE_WINDOW_SIZE = 0x1000,
  463. ENET_PEER_FREE_RELIABLE_WINDOWS = 8
  464. };
  465. typedef struct _ENetChannel {
  466. enet_uint16 outgoingReliableSequenceNumber;
  467. enet_uint16 outgoingUnreliableSequenceNumber;
  468. enet_uint16 usedReliableWindows;
  469. enet_uint16 reliableWindows[ENET_PEER_RELIABLE_WINDOWS];
  470. enet_uint16 incomingReliableSequenceNumber;
  471. enet_uint16 incomingUnreliableSequenceNumber;
  472. ENetList incomingReliableCommands;
  473. ENetList incomingUnreliableCommands;
  474. } ENetChannel;
  475. typedef struct _ENetPeer {
  476. ENetListNode dispatchList;
  477. struct _ENetHost* host;
  478. enet_uint16 outgoingPeerID;
  479. enet_uint16 incomingPeerID;
  480. enet_uint32 connectID;
  481. enet_uint8 outgoingSessionID;
  482. enet_uint8 incomingSessionID;
  483. ENetAddress address;
  484. void* data;
  485. ENetPeerState state;
  486. ENetChannel* channels;
  487. size_t channelCount;
  488. enet_uint32 incomingBandwidth;
  489. enet_uint32 outgoingBandwidth;
  490. enet_uint32 incomingBandwidthThrottleEpoch;
  491. enet_uint32 outgoingBandwidthThrottleEpoch;
  492. enet_uint32 incomingDataTotal;
  493. enet_uint64 totalDataReceived;
  494. enet_uint32 outgoingDataTotal;
  495. enet_uint64 totalDataSent;
  496. enet_uint32 lastSendTime;
  497. enet_uint32 lastReceiveTime;
  498. enet_uint32 nextTimeout;
  499. enet_uint32 earliestTimeout;
  500. enet_uint32 packetLossEpoch;
  501. enet_uint32 packetsSent;
  502. enet_uint64 totalPacketsSent;
  503. enet_uint32 packetsLost;
  504. enet_uint64 totalPacketsLost;
  505. enet_uint32 packetLoss;
  506. enet_uint32 packetLossVariance;
  507. enet_uint32 packetThrottle;
  508. enet_uint32 packetThrottleThreshold;
  509. enet_uint32 packetThrottleLimit;
  510. enet_uint32 packetThrottleCounter;
  511. enet_uint32 packetThrottleEpoch;
  512. enet_uint32 packetThrottleAcceleration;
  513. enet_uint32 packetThrottleDeceleration;
  514. enet_uint32 packetThrottleInterval;
  515. enet_uint32 pingInterval;
  516. enet_uint32 timeoutLimit;
  517. enet_uint32 timeoutMinimum;
  518. enet_uint32 timeoutMaximum;
  519. enet_uint32 lastRoundTripTime;
  520. enet_uint32 lowestRoundTripTime;
  521. enet_uint32 lastRoundTripTimeVariance;
  522. enet_uint32 highestRoundTripTimeVariance;
  523. enet_uint32 roundTripTime;
  524. enet_uint32 roundTripTimeVariance;
  525. enet_uint32 mtu;
  526. enet_uint32 windowSize;
  527. enet_uint32 reliableDataInTransit;
  528. enet_uint16 outgoingReliableSequenceNumber;
  529. ENetList acknowledgements;
  530. ENetList sentReliableCommands;
  531. ENetList sentUnreliableCommands;
  532. ENetList outgoingReliableCommands;
  533. ENetList outgoingUnreliableCommands;
  534. ENetList dispatchedCommands;
  535. int needsDispatch;
  536. enet_uint16 incomingUnsequencedGroup;
  537. enet_uint16 outgoingUnsequencedGroup;
  538. enet_uint32 unsequencedWindow[ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32];
  539. enet_uint32 eventData;
  540. size_t totalWaitingData;
  541. } ENetPeer;
  542. typedef enet_uint32 (ENET_CALLBACK *ENetChecksumCallback)(const ENetBuffer* buffers, size_t bufferCount);
  543. typedef int (ENET_CALLBACK *ENetInterceptCallback)(struct _ENetHost* host, void* event);
  544. typedef struct _ENetHost {
  545. ENetSocket socket;
  546. ENetAddress address;
  547. enet_uint32 incomingBandwidth;
  548. enet_uint32 outgoingBandwidth;
  549. enet_uint32 bandwidthThrottleEpoch;
  550. enet_uint32 mtu;
  551. enet_uint32 randomSeed;
  552. int recalculateBandwidthLimits;
  553. enet_uint8 preventConnections;
  554. ENetPeer* peers;
  555. size_t peerCount;
  556. size_t channelLimit;
  557. enet_uint32 serviceTime;
  558. ENetList dispatchQueue;
  559. int continueSending;
  560. size_t packetSize;
  561. enet_uint16 headerFlags;
  562. enet_uint32 totalSentData;
  563. enet_uint32 totalSentPackets;
  564. enet_uint32 totalReceivedData;
  565. enet_uint32 totalReceivedPackets;
  566. ENetProtocol commands[ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
  567. size_t commandCount;
  568. ENetBuffer buffers[ENET_BUFFER_MAXIMUM];
  569. size_t bufferCount;
  570. ENetChecksumCallback checksumCallback;
  571. enet_uint8 packetData[2][ENET_PROTOCOL_MAXIMUM_MTU];
  572. ENetAddress receivedAddress;
  573. enet_uint8* receivedData;
  574. size_t receivedDataLength;
  575. ENetInterceptCallback interceptCallback;
  576. size_t connectedPeers;
  577. size_t bandwidthLimitedPeers;
  578. size_t duplicatePeers;
  579. size_t maximumPacketSize;
  580. size_t maximumWaitingData;
  581. } ENetHost;
  582. typedef enum _ENetEventType {
  583. ENET_EVENT_TYPE_NONE = 0,
  584. ENET_EVENT_TYPE_CONNECT = 1,
  585. ENET_EVENT_TYPE_DISCONNECT = 2,
  586. ENET_EVENT_TYPE_RECEIVE = 3,
  587. ENET_EVENT_TYPE_DISCONNECT_TIMEOUT = 4
  588. } ENetEventType;
  589. typedef struct _ENetEvent {
  590. ENetEventType type;
  591. ENetPeer* peer;
  592. enet_uint8 channelID;
  593. enet_uint32 data;
  594. ENetPacket* packet;
  595. } ENetEvent;
  596. /*
  597. =======================================================================
  598. Public API
  599. =======================================================================
  600. */
  601. ENET_API int enet_initialize(void);
  602. ENET_API int enet_initialize_with_callbacks(ENetVersion, const ENetCallbacks*);
  603. ENET_API void enet_deinitialize(void);
  604. ENET_API ENetVersion enet_linked_version(void);
  605. ENET_API int enet_array_is_zeroed(const uint8_t*, int);
  606. ENET_API size_t enet_string_copy(char*, const char*, size_t);
  607. ENET_API enet_uint32 enet_time_get(void);
  608. ENET_API enet_uint32 enet_crc32(const ENetBuffer*, size_t);
  609. ENET_API ENetPacket* enet_packet_create(const void*, size_t, enet_uint32);
  610. ENET_API ENetPacket* enet_packet_create_offset(const void*, size_t, size_t, enet_uint32);
  611. ENET_API void enet_packet_destroy(ENetPacket*);
  612. ENET_API int enet_peer_send(ENetPeer*, enet_uint8, ENetPacket*);
  613. ENET_API ENetPacket* enet_peer_receive(ENetPeer*, enet_uint8*);
  614. ENET_API void enet_peer_ping(ENetPeer*);
  615. ENET_API void enet_peer_ping_interval(ENetPeer*, enet_uint32);
  616. ENET_API void enet_peer_timeout(ENetPeer*, enet_uint32, enet_uint32, enet_uint32);
  617. ENET_API void enet_peer_reset(ENetPeer*);
  618. ENET_API void enet_peer_disconnect(ENetPeer*, enet_uint32);
  619. ENET_API void enet_peer_disconnect_now(ENetPeer*, enet_uint32);
  620. ENET_API void enet_peer_disconnect_later(ENetPeer*, enet_uint32);
  621. ENET_API void enet_peer_throttle_configure(ENetPeer*, enet_uint32, enet_uint32, enet_uint32, enet_uint32);
  622. ENET_API ENetHost* enet_host_create(const ENetAddress*, size_t, size_t, enet_uint32, enet_uint32, int);
  623. ENET_API void enet_host_destroy(ENetHost*);
  624. ENET_API void enet_host_prevent_connections(ENetHost*, enet_uint8);
  625. ENET_API ENetPeer* enet_host_connect(ENetHost*, const ENetAddress*, size_t, enet_uint32);
  626. ENET_API int enet_host_check_events(ENetHost*, ENetEvent*);
  627. ENET_API int enet_host_service(ENetHost*, ENetEvent*, enet_uint32);
  628. ENET_API void enet_host_flush(ENetHost*);
  629. ENET_API void enet_host_broadcast(ENetHost*, enet_uint8, ENetPacket*);
  630. ENET_API void enet_host_broadcast_exclude(ENetHost*, enet_uint8, ENetPacket*, ENetPeer*);
  631. ENET_API void enet_host_broadcast_selective(ENetHost*, enet_uint8, ENetPacket*, ENetPeer**, size_t);
  632. ENET_API void enet_host_channel_limit(ENetHost*, size_t);
  633. ENET_API void enet_host_bandwidth_limit(ENetHost*, enet_uint32, enet_uint32);
  634. ENET_API int enet_address_set_ip(ENetAddress*, const char*);
  635. ENET_API int enet_address_set_hostname(ENetAddress*, const char*);
  636. ENET_API int enet_address_get_ip(const ENetAddress*, char*, size_t);
  637. ENET_API int enet_address_get_hostname(const ENetAddress*, char*, size_t);
  638. ENET_API ENetSocket enet_socket_create(ENetSocketType);
  639. ENET_API int enet_socket_bind(ENetSocket, const ENetAddress*);
  640. ENET_API int enet_socket_get_address(ENetSocket, ENetAddress*);
  641. ENET_API int enet_socket_listen(ENetSocket, int);
  642. ENET_API ENetSocket enet_socket_accept(ENetSocket, ENetAddress*);
  643. ENET_API int enet_socket_connect(ENetSocket, const ENetAddress*);
  644. ENET_API int enet_socket_send(ENetSocket, const ENetAddress*, const ENetBuffer*, size_t);
  645. ENET_API int enet_socket_receive(ENetSocket, ENetAddress*, ENetBuffer*, size_t);
  646. ENET_API int enet_socket_wait(ENetSocket, enet_uint32*, enet_uint64);
  647. ENET_API int enet_socket_set_option(ENetSocket, ENetSocketOption, int);
  648. ENET_API int enet_socket_get_option(ENetSocket, ENetSocketOption, int*);
  649. ENET_API int enet_socket_shutdown(ENetSocket, ENetSocketShutdown);
  650. ENET_API void enet_socket_destroy(ENetSocket);
  651. ENET_API int enet_socket_set_select(ENetSocket, ENetSocketSet*, ENetSocketSet*, enet_uint32);
  652. /* Extended API for easier binding in other programming languages */
  653. ENET_API void* enet_packet_get_data(const ENetPacket*);
  654. ENET_API void* enet_packet_get_user_data(const ENetPacket*);
  655. ENET_API void enet_packet_set_user_data(ENetPacket*, void* userData);
  656. ENET_API int enet_packet_get_length(const ENetPacket*);
  657. ENET_API void enet_packet_set_free_callback(ENetPacket*, const void*);
  658. ENET_API int enet_packet_check_references(const ENetPacket*);
  659. ENET_API void enet_packet_dispose(ENetPacket*);
  660. ENET_API enet_uint32 enet_host_get_peers_count(const ENetHost*);
  661. ENET_API enet_uint32 enet_host_get_packets_sent(const ENetHost*);
  662. ENET_API enet_uint32 enet_host_get_packets_received(const ENetHost*);
  663. ENET_API enet_uint32 enet_host_get_bytes_sent(const ENetHost*);
  664. ENET_API enet_uint32 enet_host_get_bytes_received(const ENetHost*);
  665. ENET_API enet_uint32 enet_peer_get_id(const ENetPeer*);
  666. ENET_API int enet_peer_get_ip(const ENetPeer*, char*, size_t);
  667. ENET_API enet_uint16 enet_peer_get_port(const ENetPeer*);
  668. ENET_API enet_uint32 enet_peer_get_mtu(const ENetPeer*);
  669. ENET_API ENetPeerState enet_peer_get_state(const ENetPeer*);
  670. ENET_API enet_uint32 enet_peer_get_rtt(const ENetPeer*);
  671. ENET_API enet_uint32 enet_peer_get_lastsendtime(const ENetPeer*);
  672. ENET_API enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer*);
  673. ENET_API enet_uint64 enet_peer_get_packets_sent(const ENetPeer*);
  674. ENET_API enet_uint64 enet_peer_get_packets_lost(const ENetPeer*);
  675. ENET_API enet_uint64 enet_peer_get_bytes_sent(const ENetPeer*);
  676. ENET_API enet_uint64 enet_peer_get_bytes_received(const ENetPeer*);
  677. ENET_API void* enet_peer_get_data(const ENetPeer*);
  678. ENET_API void enet_peer_set_data(ENetPeer*, const void*);
  679. /*
  680. =======================================================================
  681. Private API
  682. =======================================================================
  683. */
  684. extern void enet_host_bandwidth_throttle(ENetHost*);
  685. extern enet_uint64 enet_host_random_seed(void);
  686. extern int enet_peer_throttle(ENetPeer*, enet_uint32);
  687. extern void enet_peer_reset_queues(ENetPeer*);
  688. extern void enet_peer_setup_outgoing_command(ENetPeer*, ENetOutgoingCommand*);
  689. extern ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer*, const ENetProtocol*, ENetPacket*, enet_uint32, enet_uint16);
  690. extern ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer*, const ENetProtocol*, const void*, size_t, enet_uint32, enet_uint32);
  691. extern ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer*, const ENetProtocol*, enet_uint16);
  692. extern void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer*, ENetChannel*);
  693. extern void enet_peer_dispatch_incoming_reliable_commands(ENetPeer*, ENetChannel*);
  694. extern void enet_peer_on_connect(ENetPeer*);
  695. extern void enet_peer_on_disconnect(ENetPeer*);
  696. extern size_t enet_protocol_command_size(enet_uint8);
  697. #ifdef __cplusplus
  698. }
  699. #endif
  700. #if defined(ENET_IMPLEMENTATION) && !defined(ENET_IMPLEMENTATION_DONE)
  701. #define ENET_IMPLEMENTATION_DONE 1
  702. #ifdef _MSC_VER
  703. #pragma warning(push)
  704. #pragma warning(disable: 4244) /* 64-bit to 32-bit integer conversion */
  705. #pragma warning(disable: 4267) /* size_t to integer conversion */
  706. #endif
  707. /*
  708. =======================================================================
  709. Atomics
  710. =======================================================================
  711. */
  712. #ifdef _MSC_VER
  713. #define ENET_AT_CASSERT_PRED(predicate) sizeof(char[2 * !!(predicate) - 1])
  714. #define ENET_IS_SUPPORTED_ATOMIC(size) ENET_AT_CASSERT_PRED(size == 1 || size == 2 || size == 4 || size == 8)
  715. #define ENET_ATOMIC_SIZEOF(variable) (ENET_IS_SUPPORTED_ATOMIC(sizeof(*(variable))), sizeof(*(variable)))
  716. __inline int64_t enet_at_atomic_read(char* ptr, size_t size) {
  717. switch (size) {
  718. case 1:
  719. return _InterlockedExchangeAdd8((volatile char*)ptr, 0);
  720. case 2:
  721. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, 0);
  722. case 4:
  723. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  724. return InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  725. #else
  726. return _InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  727. #endif
  728. case 8:
  729. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  730. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  731. #else
  732. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  733. #endif
  734. default:
  735. return 0x0;
  736. }
  737. }
  738. __inline int64_t enet_at_atomic_write(char* ptr, int64_t value, size_t size) {
  739. switch (size) {
  740. case 1:
  741. return _InterlockedExchange8((volatile char*)ptr, (char)value);
  742. case 2:
  743. return _InterlockedExchange16((volatile SHORT*)ptr, (SHORT)value);
  744. case 4:
  745. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  746. return InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  747. #else
  748. return _InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  749. #endif
  750. case 8:
  751. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  752. return InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  753. #else
  754. return _InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  755. #endif
  756. default:
  757. return 0x0;
  758. }
  759. }
  760. __inline int64_t enet_at_atomic_cas(char* ptr, int64_t new_val, int64_t old_val, size_t size) {
  761. switch (size) {
  762. case 1:
  763. return _InterlockedCompareExchange8((volatile char*)ptr, (char)new_val, (char)old_val);
  764. case 2:
  765. return _InterlockedCompareExchange16((volatile SHORT*)ptr, (SHORT)new_val, (SHORT)old_val);
  766. case 4:
  767. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  768. return InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  769. #else
  770. return _InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  771. #endif
  772. case 8:
  773. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  774. return InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  775. #else
  776. return _InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  777. #endif
  778. default:
  779. return 0x0;
  780. }
  781. }
  782. __inline int64_t enet_at_atomic_inc(char* ptr, int64_t delta, size_t data_size) {
  783. switch (data_size) {
  784. case 1:
  785. return _InterlockedExchangeAdd8((volatile char*)ptr, (char)delta);
  786. case 2:
  787. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, (SHORT)delta);
  788. case 4:
  789. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  790. return InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  791. #else
  792. return _InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  793. #endif
  794. case 8:
  795. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  796. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  797. #else
  798. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  799. #endif
  800. default:
  801. return 0x0;
  802. }
  803. }
  804. #define ENET_ATOMIC_READ(variable) enet_at_atomic_read((char*)(variable), ENET_ATOMIC_SIZEOF(variable))
  805. #define ENET_ATOMIC_WRITE(variable, new_val) enet_at_atomic_write((char*)(variable), (int64_t)(new_val), ENET_ATOMIC_SIZEOF(variable))
  806. #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))
  807. #define ENET_ATOMIC_INC(variable) enet_at_atomic_inc((char*)(variable), 1, ENET_ATOMIC_SIZEOF(variable))
  808. #define ENET_ATOMIC_DEC(variable) enet_at_atomic_inc((char*)(variable), -1, ENET_ATOMIC_SIZEOF(variable))
  809. #define ENET_ATOMIC_INC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), (delta), ENET_ATOMIC_SIZEOF(variable))
  810. #define ENET_ATOMIC_DEC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), -(delta), ENET_ATOMIC_SIZEOF(variable))
  811. #elif defined(__GNUC__) || defined(__clang__)
  812. #if defined(__clang__) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
  813. #define AT_HAVE_ATOMICS
  814. #endif
  815. /* We want to use __atomic built-ins if possible because the __sync primitives are
  816. deprecated, because the __atomic build-ins allow us to use ENET_ATOMIC_WRITE on
  817. uninitialized memory without running into undefined behavior, and because the
  818. __atomic versions generate more efficient code since we don't need to rely on
  819. CAS when we don't actually want it.
  820. Note that we use acquire-release memory order (like mutexes do). We could use
  821. sequentially consistent memory order but that has lower performance and is
  822. almost always unneeded. */
  823. #ifdef AT_HAVE_ATOMICS
  824. #define ENET_ATOMIC_READ(ptr) __atomic_load_n((ptr), __ATOMIC_ACQUIRE)
  825. #define ENET_ATOMIC_WRITE(ptr, value) __atomic_store_n((ptr), (value), __ATOMIC_RELEASE)
  826. #ifndef typeof
  827. #define typeof __typeof__
  828. #endif
  829. /* clang_analyzer doesn't know that CAS writes to memory so it complains about
  830. potentially lost data. Replace the code with the equivalent non-sync code. */
  831. #ifdef __clang_analyzer__
  832. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  833. ({ \
  834. typeof(*(ptr)) ENET_ATOMIC_CAS_old_actual_ = (*(ptr)); \
  835. if (ATOMIC_CAS_old_actual_ == (old_value)) \
  836. *(ptr) = new_value; \
  837. ENET_ATOMIC_CAS_old_actual_; \
  838. })
  839. #else
  840. /* Could use __auto_type instead of typeof but that shouldn't work in C++.
  841. The ({ }) syntax is a GCC extension called statement expression. It lets
  842. us return a value out of the macro.
  843. TODO We should return bool here instead of the old value to avoid the ABA
  844. problem. */
  845. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  846. ({ \
  847. typeof(*(ptr)) ENET_ATOMIC_CAS_expected_ = (old_value); \
  848. __atomic_compare_exchange_n((ptr), &ENET_ATOMIC_CAS_expected_, (new_value), false, \
  849. __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE); \
  850. ENET_ATOMIC_CAS_expected_; \
  851. })
  852. #endif
  853. #define ENET_ATOMIC_INC(ptr) __atomic_fetch_add((ptr), 1, __ATOMIC_ACQ_REL)
  854. #define ENET_ATOMIC_DEC(ptr) __atomic_fetch_sub((ptr), 1, __ATOMIC_ACQ_REL)
  855. #define ENET_ATOMIC_INC_BY(ptr, delta) __atomic_fetch_add((ptr), (delta), __ATOMIC_ACQ_REL)
  856. #define ENET_ATOMIC_DEC_BY(ptr, delta) __atomic_fetch_sub((ptr), (delta), __ATOMIC_ACQ_REL)
  857. #else
  858. #define ENET_ATOMIC_READ(variable) __sync_fetch_and_add(variable, 0)
  859. #define ENET_ATOMIC_WRITE(variable, new_val) (void)__sync_val_compare_and_swap((variable), *(variable), (new_val))
  860. #define ENET_ATOMIC_CAS(variable, old_value, new_val) __sync_val_compare_and_swap((variable), (old_value), (new_val))
  861. #define ENET_ATOMIC_INC(variable) __sync_fetch_and_add((variable), 1)
  862. #define ENET_ATOMIC_DEC(variable) __sync_fetch_and_sub((variable), 1)
  863. #define ENET_ATOMIC_INC_BY(variable, delta) __sync_fetch_and_add((variable), (delta), 1)
  864. #define ENET_ATOMIC_DEC_BY(variable, delta) __sync_fetch_and_sub((variable), (delta), 1)
  865. #endif
  866. #undef AT_HAVE_ATOMICS
  867. #endif
  868. /*
  869. =======================================================================
  870. Callbacks
  871. =======================================================================
  872. */
  873. static ENetCallbacks callbacks = {
  874. malloc,
  875. free,
  876. abort
  877. };
  878. int enet_initialize_with_callbacks(ENetVersion version, const ENetCallbacks* inits) {
  879. if (version < ENET_VERSION_CREATE(1, 3, 0))
  880. return -1;
  881. if (inits->malloc != NULL || inits->free != NULL) {
  882. if (inits->malloc == NULL || inits->free == NULL)
  883. return -1;
  884. callbacks.malloc = inits->malloc;
  885. callbacks.free = inits->free;
  886. }
  887. if (inits->noMemory != NULL)
  888. callbacks.noMemory = inits->noMemory;
  889. return enet_initialize();
  890. }
  891. void* enet_malloc(size_t size) {
  892. void* memory = callbacks.malloc(size);
  893. if (memory == NULL)
  894. callbacks.noMemory();
  895. return memory;
  896. }
  897. void enet_free(void* memory) {
  898. callbacks.free(memory);
  899. }
  900. /*
  901. =======================================================================
  902. List
  903. =======================================================================
  904. */
  905. void enet_list_clear(ENetList* list) {
  906. list->sentinel.next = &list->sentinel;
  907. list->sentinel.previous = &list->sentinel;
  908. }
  909. ENetListIterator enet_list_insert(ENetListIterator position, void* data) {
  910. ENetListIterator result = (ENetListIterator)data;
  911. result->previous = position->previous;
  912. result->next = position;
  913. result->previous->next = result;
  914. position->previous = result;
  915. return result;
  916. }
  917. void* enet_list_remove(ENetListIterator position) {
  918. position->previous->next = position->next;
  919. position->next->previous = position->previous;
  920. return position;
  921. }
  922. ENetListIterator enet_list_move(ENetListIterator position, void* dataFirst, void* dataLast) {
  923. ENetListIterator first = (ENetListIterator)dataFirst;
  924. ENetListIterator last = (ENetListIterator)dataLast;
  925. first->previous->next = last->next;
  926. last->next->previous = first->previous;
  927. first->previous = position->previous;
  928. last->next = position;
  929. first->previous->next = first;
  930. position->previous = last;
  931. return first;
  932. }
  933. size_t enet_list_size(ENetList* list) {
  934. size_t size = 0;
  935. ENetListIterator position;
  936. for (position = enet_list_begin(list); position != enet_list_end(list); position = enet_list_next(position)) {
  937. ++size;
  938. }
  939. return size;
  940. }
  941. /*
  942. =======================================================================
  943. Utilities
  944. =======================================================================
  945. */
  946. ENetVersion enet_linked_version(void) {
  947. return ENET_VERSION;
  948. }
  949. int enet_array_is_zeroed(const uint8_t* array, int length) {
  950. size_t i;
  951. for (i = 0; i < length; i++) {
  952. if (array[i] != 0)
  953. return -1;
  954. }
  955. return 0;
  956. }
  957. size_t enet_string_copy(char* destination, const char* source, size_t length) {
  958. char* d = destination;
  959. const char* s = source;
  960. size_t n = length;
  961. if (n != 0 && --n != 0) {
  962. do {
  963. if ((*d++ = *s++) == 0)
  964. break;
  965. }
  966. while (--n != 0);
  967. }
  968. if (n == 0) {
  969. if (length != 0)
  970. *d = '\0';
  971. while (*s++);
  972. }
  973. return (s - source - 1);
  974. }
  975. /*
  976. =======================================================================
  977. Time
  978. =======================================================================
  979. */
  980. #ifdef _WIN32
  981. static LARGE_INTEGER gettime_offset(void) {
  982. SYSTEMTIME s;
  983. FILETIME f;
  984. LARGE_INTEGER t;
  985. s.wYear = 1970;
  986. s.wMonth = 1;
  987. s.wDay = 1;
  988. s.wHour = 0;
  989. s.wMinute = 0;
  990. s.wSecond = 0;
  991. s.wMilliseconds = 0;
  992. SystemTimeToFileTime(&s, &f);
  993. t.QuadPart = f.dwHighDateTime;
  994. t.QuadPart <<= 32;
  995. t.QuadPart |= f.dwLowDateTime;
  996. return t;
  997. }
  998. int clock_gettime(int X, struct timespec* tv) {
  999. LARGE_INTEGER t;
  1000. FILETIME f;
  1001. double microseconds;
  1002. static LARGE_INTEGER offset;
  1003. static double frequencyToMicroseconds;
  1004. static int initialized = 0;
  1005. static BOOL usePerformanceCounter = 0;
  1006. if (!initialized) {
  1007. LARGE_INTEGER performanceFrequency;
  1008. initialized = 1;
  1009. usePerformanceCounter = QueryPerformanceFrequency(&performanceFrequency);
  1010. if (usePerformanceCounter) {
  1011. QueryPerformanceCounter(&offset);
  1012. frequencyToMicroseconds = (double)performanceFrequency.QuadPart / 1000000.;
  1013. } else {
  1014. offset = gettime_offset();
  1015. frequencyToMicroseconds = 10.;
  1016. }
  1017. }
  1018. if (usePerformanceCounter) {
  1019. QueryPerformanceCounter(&t);
  1020. } else {
  1021. GetSystemTimeAsFileTime(&f);
  1022. t.QuadPart = f.dwHighDateTime;
  1023. t.QuadPart <<= 32;
  1024. t.QuadPart |= f.dwLowDateTime;
  1025. }
  1026. t.QuadPart -= offset.QuadPart;
  1027. microseconds = (double)t.QuadPart / frequencyToMicroseconds;
  1028. t.QuadPart = (LONGLONG)microseconds;
  1029. tv->tv_sec = (long)(t.QuadPart / 1000000);
  1030. tv->tv_nsec = t.QuadPart % 1000000 * 1000;
  1031. return 0;
  1032. }
  1033. #elif __APPLE__ && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 && !defined(CLOCK_MONOTONIC)
  1034. #define CLOCK_MONOTONIC 0
  1035. int clock_gettime(int X, struct timespec* ts) {
  1036. clock_serv_t cclock;
  1037. mach_timespec_t mts;
  1038. host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
  1039. clock_get_time(cclock, &mts);
  1040. mach_port_deallocate(mach_task_self(), cclock);
  1041. ts->tv_sec = mts.tv_sec;
  1042. ts->tv_nsec = mts.tv_nsec;
  1043. return 0;
  1044. }
  1045. #endif
  1046. enet_uint32 enet_time_get(void) {
  1047. static enet_uint64 start_time_ns = 0;
  1048. struct timespec ts;
  1049. #ifdef CLOCK_MONOTONIC_RAW
  1050. clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
  1051. #else
  1052. clock_gettime(CLOCK_MONOTONIC, &ts);
  1053. #endif
  1054. static const enet_uint64 ns_in_s = 1000 * 1000 * 1000;
  1055. static const enet_uint64 ns_in_ms = 1000 * 1000;
  1056. enet_uint64 current_time_ns = ts.tv_nsec + (enet_uint64)ts.tv_sec * ns_in_s;
  1057. enet_uint64 offset_ns = ENET_ATOMIC_READ(&start_time_ns);
  1058. if (offset_ns == 0) {
  1059. enet_uint64 want_value = current_time_ns - 1 * ns_in_ms;
  1060. enet_uint64 old_value = ENET_ATOMIC_CAS(&start_time_ns, 0, want_value);
  1061. offset_ns = old_value == 0 ? want_value : old_value;
  1062. }
  1063. enet_uint64 result_in_ns = current_time_ns - offset_ns;
  1064. return (enet_uint32)(result_in_ns / ns_in_ms);
  1065. }
  1066. /*
  1067. =======================================================================
  1068. Checksum
  1069. =======================================================================
  1070. */
  1071. static int initializedCRC32 = 0;
  1072. static enet_uint32 crcTable[256];
  1073. static enet_uint32 reflect_crc(int val, int bits) {
  1074. int result = 0, bit;
  1075. for (bit = 0; bit < bits; bit++) {
  1076. if (val & 1)
  1077. result |= 1 << (bits - 1 - bit);
  1078. val >>= 1;
  1079. }
  1080. return result;
  1081. }
  1082. static void initialize_crc32(void) {
  1083. int byte;
  1084. for (byte = 0; byte < 256; ++byte) {
  1085. enet_uint32 crc = reflect_crc(byte, 8) << 24;
  1086. int offset;
  1087. for (offset = 0; offset < 8; ++offset) {
  1088. if (crc & 0x80000000)
  1089. crc = (crc << 1) ^ 0x04c11db7;
  1090. else
  1091. crc <<= 1;
  1092. }
  1093. crcTable[byte] = reflect_crc(crc, 32);
  1094. }
  1095. initializedCRC32 = 1;
  1096. }
  1097. enet_uint32 enet_crc32(const ENetBuffer* buffers, size_t bufferCount) {
  1098. enet_uint32 crc = 0xFFFFFFFF;
  1099. if (!initializedCRC32)
  1100. initialize_crc32();
  1101. while (bufferCount-- > 0) {
  1102. const enet_uint8* data = (const enet_uint8*)buffers->data;
  1103. const enet_uint8* dataEnd = &data[buffers->dataLength];
  1104. while (data < dataEnd) {
  1105. crc = (crc >> 8) ^ crcTable[(crc & 0xFF)^* data++];
  1106. }
  1107. ++buffers;
  1108. }
  1109. return ENET_HOST_TO_NET_32(~crc);
  1110. }
  1111. /*
  1112. =======================================================================
  1113. Packet
  1114. =======================================================================
  1115. */
  1116. ENetPacket* enet_packet_create(const void* data, size_t dataLength, enet_uint32 flags) {
  1117. ENetPacket* packet;
  1118. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1119. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1120. if (packet == NULL)
  1121. return NULL;
  1122. packet->data = (enet_uint8*)data;
  1123. } else {
  1124. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength);
  1125. if (packet == NULL)
  1126. return NULL;
  1127. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1128. if (data != NULL)
  1129. memcpy(packet->data, data, dataLength);
  1130. }
  1131. packet->referenceCount = 0;
  1132. packet->flags = flags;
  1133. packet->dataLength = dataLength;
  1134. packet->freeCallback = NULL;
  1135. packet->userData = NULL;
  1136. return packet;
  1137. }
  1138. ENetPacket* enet_packet_create_offset(const void* data, size_t dataLength, size_t dataOffset, enet_uint32 flags) {
  1139. ENetPacket* packet;
  1140. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1141. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1142. if (packet == NULL)
  1143. return NULL;
  1144. packet->data = (enet_uint8*)data;
  1145. } else {
  1146. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength - dataOffset);
  1147. if (packet == NULL)
  1148. return NULL;
  1149. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1150. if (data != NULL)
  1151. memcpy(packet->data, (char*)data + dataOffset, dataLength - dataOffset);
  1152. }
  1153. packet->referenceCount = 0;
  1154. packet->flags = flags;
  1155. packet->dataLength = dataLength - dataOffset;
  1156. packet->freeCallback = NULL;
  1157. packet->userData = NULL;
  1158. return packet;
  1159. }
  1160. void enet_packet_destroy(ENetPacket* packet) {
  1161. if (packet == NULL)
  1162. return;
  1163. if (packet->freeCallback != NULL)
  1164. (*packet->freeCallback)((void*)packet);
  1165. enet_free(packet);
  1166. }
  1167. /*
  1168. =======================================================================
  1169. Protocol
  1170. =======================================================================
  1171. */
  1172. static size_t commandSizes[ENET_PROTOCOL_COMMAND_COUNT] = {
  1173. 0,
  1174. sizeof(ENetProtocolAcknowledge),
  1175. sizeof(ENetProtocolConnect),
  1176. sizeof(ENetProtocolVerifyConnect),
  1177. sizeof(ENetProtocolDisconnect),
  1178. sizeof(ENetProtocolPing),
  1179. sizeof(ENetProtocolSendReliable),
  1180. sizeof(ENetProtocolSendUnreliable),
  1181. sizeof(ENetProtocolSendFragment),
  1182. sizeof(ENetProtocolSendUnsequenced),
  1183. sizeof(ENetProtocolBandwidthLimit),
  1184. sizeof(ENetProtocolThrottleConfigure),
  1185. sizeof(ENetProtocolSendFragment)
  1186. };
  1187. size_t enet_protocol_command_size(enet_uint8 commandNumber) {
  1188. return commandSizes[commandNumber & ENET_PROTOCOL_COMMAND_MASK];
  1189. }
  1190. static void enet_protocol_change_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1191. if (state == ENET_PEER_STATE_CONNECTED || state == ENET_PEER_STATE_DISCONNECT_LATER)
  1192. enet_peer_on_connect(peer);
  1193. else
  1194. enet_peer_on_disconnect(peer);
  1195. peer->state = state;
  1196. }
  1197. static void enet_protocol_dispatch_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1198. enet_protocol_change_state(host, peer, state);
  1199. if (!peer->needsDispatch) {
  1200. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1201. peer->needsDispatch = 1;
  1202. }
  1203. }
  1204. static int enet_protocol_dispatch_incoming_commands(ENetHost* host, ENetEvent* event) {
  1205. while (!enet_list_empty(&host->dispatchQueue)) {
  1206. ENetPeer* peer = (ENetPeer*)enet_list_remove(enet_list_begin(&host->dispatchQueue));
  1207. peer->needsDispatch = 0;
  1208. switch (peer->state) {
  1209. case ENET_PEER_STATE_CONNECTION_PENDING:
  1210. case ENET_PEER_STATE_CONNECTION_SUCCEEDED:
  1211. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1212. event->type = ENET_EVENT_TYPE_CONNECT;
  1213. event->peer = peer;
  1214. event->data = peer->eventData;
  1215. return 1;
  1216. case ENET_PEER_STATE_ZOMBIE:
  1217. host->recalculateBandwidthLimits = 1;
  1218. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1219. event->peer = peer;
  1220. event->data = peer->eventData;
  1221. enet_peer_reset(peer);
  1222. return 1;
  1223. case ENET_PEER_STATE_CONNECTED:
  1224. if (enet_list_empty(&peer->dispatchedCommands))
  1225. continue;
  1226. event->packet = enet_peer_receive(peer, &event->channelID);
  1227. if (event->packet == NULL)
  1228. continue;
  1229. event->type = ENET_EVENT_TYPE_RECEIVE;
  1230. event->peer = peer;
  1231. if (!enet_list_empty(&peer->dispatchedCommands)) {
  1232. peer->needsDispatch = 1;
  1233. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1234. }
  1235. return 1;
  1236. default:
  1237. break;
  1238. }
  1239. }
  1240. return 0;
  1241. }
  1242. static void enet_protocol_notify_connect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1243. host->recalculateBandwidthLimits = 1;
  1244. if (event != NULL) {
  1245. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1246. peer->totalDataSent = 0;
  1247. peer->totalDataReceived = 0;
  1248. peer->totalPacketsSent = 0;
  1249. peer->totalPacketsLost = 0;
  1250. event->type = ENET_EVENT_TYPE_CONNECT;
  1251. event->peer = peer;
  1252. event->data = peer->eventData;
  1253. } else {
  1254. enet_protocol_dispatch_state(host, peer, peer->state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING);
  1255. }
  1256. }
  1257. static void enet_protocol_notify_disconnect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1258. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1259. host->recalculateBandwidthLimits = 1;
  1260. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1261. enet_peer_reset(peer);
  1262. } else if (event != NULL) {
  1263. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1264. event->peer = peer;
  1265. event->data = 0;
  1266. enet_peer_reset(peer);
  1267. } else {
  1268. peer->eventData = 0;
  1269. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1270. }
  1271. }
  1272. static void enet_protocol_notify_disconnect_timeout(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1273. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1274. host->recalculateBandwidthLimits = 1;
  1275. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1276. enet_peer_reset(peer);
  1277. } else if (event != NULL) {
  1278. event->type = ENET_EVENT_TYPE_DISCONNECT_TIMEOUT;
  1279. event->peer = peer;
  1280. event->data = 0;
  1281. enet_peer_reset(peer);
  1282. } else {
  1283. peer->eventData = 0;
  1284. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1285. }
  1286. }
  1287. static void enet_protocol_remove_sent_unreliable_commands(ENetPeer* peer) {
  1288. ENetOutgoingCommand* outgoingCommand;
  1289. if (enet_list_empty(&peer->sentUnreliableCommands))
  1290. return;
  1291. do {
  1292. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentUnreliableCommands);
  1293. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1294. if (outgoingCommand->packet != NULL) {
  1295. --outgoingCommand->packet->referenceCount;
  1296. if (outgoingCommand->packet->referenceCount == 0) {
  1297. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1298. enet_packet_destroy(outgoingCommand->packet);
  1299. }
  1300. }
  1301. enet_free(outgoingCommand);
  1302. }
  1303. while (!enet_list_empty(&peer->sentUnreliableCommands));
  1304. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1305. enet_peer_disconnect(peer, peer->eventData);
  1306. }
  1307. static ENetProtocolCommand enet_protocol_remove_sent_reliable_command(ENetPeer* peer, enet_uint16 reliableSequenceNumber, enet_uint8 channelID) {
  1308. ENetOutgoingCommand* outgoingCommand = NULL;
  1309. ENetListIterator currentCommand;
  1310. ENetProtocolCommand commandNumber;
  1311. int wasSent = 1;
  1312. for (currentCommand = enet_list_begin(&peer->sentReliableCommands); currentCommand != enet_list_end(&peer->sentReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1313. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1314. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1315. break;
  1316. }
  1317. if (currentCommand == enet_list_end(&peer->sentReliableCommands)) {
  1318. for (currentCommand = enet_list_begin(&peer->outgoingReliableCommands); currentCommand != enet_list_end(&peer->outgoingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1319. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1320. if (outgoingCommand->sendAttempts < 1)
  1321. return ENET_PROTOCOL_COMMAND_NONE;
  1322. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1323. break;
  1324. }
  1325. if (currentCommand == enet_list_end(&peer->outgoingReliableCommands))
  1326. return ENET_PROTOCOL_COMMAND_NONE;
  1327. wasSent = 0;
  1328. }
  1329. if (outgoingCommand == NULL)
  1330. return ENET_PROTOCOL_COMMAND_NONE;
  1331. if (channelID < peer->channelCount) {
  1332. ENetChannel* channel = &peer->channels[channelID];
  1333. enet_uint16 reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1334. if (channel->reliableWindows[reliableWindow] > 0) {
  1335. --channel->reliableWindows[reliableWindow];
  1336. if (!channel->reliableWindows[reliableWindow])
  1337. channel->usedReliableWindows &= ~(1 << reliableWindow);
  1338. }
  1339. }
  1340. commandNumber = (ENetProtocolCommand)(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK);
  1341. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1342. if (outgoingCommand->packet != NULL) {
  1343. if (wasSent)
  1344. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  1345. --outgoingCommand->packet->referenceCount;
  1346. if (outgoingCommand->packet->referenceCount == 0) {
  1347. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1348. enet_packet_destroy(outgoingCommand->packet);
  1349. }
  1350. }
  1351. enet_free(outgoingCommand);
  1352. if (enet_list_empty(&peer->sentReliableCommands))
  1353. return commandNumber;
  1354. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentReliableCommands);
  1355. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  1356. return commandNumber;
  1357. }
  1358. static ENetPeer* enet_protocol_handle_connect(ENetHost* host, ENetProtocolHeader* header, ENetProtocol* command) {
  1359. enet_uint8 incomingSessionID, outgoingSessionID;
  1360. enet_uint32 mtu, windowSize;
  1361. ENetChannel* channel;
  1362. size_t channelCount, duplicatePeers = 0;
  1363. ENetPeer* currentPeer, *peer = NULL;
  1364. ENetProtocol verifyCommand;
  1365. channelCount = ENET_NET_TO_HOST_32(command->connect.channelCount);
  1366. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  1367. return NULL;
  1368. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  1369. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED) {
  1370. if (peer == NULL)
  1371. peer = currentPeer;
  1372. } else if (currentPeer->state != ENET_PEER_STATE_CONNECTING && enet_in6_equal(currentPeer->address.ipv6, host->receivedAddress.ipv6)) {
  1373. if (currentPeer->address.port == host->receivedAddress.port && currentPeer->connectID == command->connect.connectID)
  1374. return NULL;
  1375. ++duplicatePeers;
  1376. }
  1377. }
  1378. if (peer == NULL || duplicatePeers >= host->duplicatePeers)
  1379. return NULL;
  1380. if (channelCount > host->channelLimit)
  1381. channelCount = host->channelLimit;
  1382. peer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  1383. if (peer->channels == NULL)
  1384. return NULL;
  1385. peer->channelCount = channelCount;
  1386. peer->state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
  1387. peer->connectID = command->connect.connectID;
  1388. peer->address = host->receivedAddress;
  1389. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->connect.outgoingPeerID);
  1390. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->connect.incomingBandwidth);
  1391. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->connect.outgoingBandwidth);
  1392. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->connect.packetThrottleInterval);
  1393. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleAcceleration);
  1394. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleDeceleration);
  1395. peer->eventData = ENET_NET_TO_HOST_32(command->connect.data);
  1396. incomingSessionID = command->connect.incomingSessionID == 0xFF ? peer->outgoingSessionID : command->connect.incomingSessionID;
  1397. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1398. if (incomingSessionID == peer->outgoingSessionID)
  1399. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1400. peer->outgoingSessionID = incomingSessionID;
  1401. outgoingSessionID = command->connect.outgoingSessionID == 0xFF ? peer->incomingSessionID : command->connect.outgoingSessionID;
  1402. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1403. if (outgoingSessionID == peer->incomingSessionID)
  1404. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1405. peer->incomingSessionID = outgoingSessionID;
  1406. for (channel = peer->channels; channel < &peer->channels[channelCount]; ++channel) {
  1407. channel->outgoingReliableSequenceNumber = 0;
  1408. channel->outgoingUnreliableSequenceNumber = 0;
  1409. channel->incomingReliableSequenceNumber = 0;
  1410. channel->incomingUnreliableSequenceNumber = 0;
  1411. enet_list_clear(&channel->incomingReliableCommands);
  1412. enet_list_clear(&channel->incomingUnreliableCommands);
  1413. channel->usedReliableWindows = 0;
  1414. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  1415. }
  1416. mtu = ENET_NET_TO_HOST_32(command->connect.mtu);
  1417. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1418. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1419. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1420. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1421. peer->mtu = mtu;
  1422. if (host->outgoingBandwidth == 0 && peer->incomingBandwidth == 0)
  1423. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1424. else if (host->outgoingBandwidth == 0 || peer->incomingBandwidth == 0)
  1425. peer->windowSize = (ENET_MAX(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1426. else
  1427. peer->windowSize = (ENET_MIN(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1428. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1429. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1430. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1431. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1432. if (host->incomingBandwidth == 0)
  1433. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1434. else
  1435. windowSize = (host->incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1436. if (windowSize > ENET_NET_TO_HOST_32(command->connect.windowSize))
  1437. windowSize = ENET_NET_TO_HOST_32(command->connect.windowSize);
  1438. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1439. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1440. else if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1441. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1442. verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  1443. verifyCommand.header.channelID = 0xFF;
  1444. verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16(peer->incomingPeerID);
  1445. verifyCommand.verifyConnect.incomingSessionID = incomingSessionID;
  1446. verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID;
  1447. verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_32(peer->mtu);
  1448. verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32(windowSize);
  1449. verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  1450. verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  1451. verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  1452. verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32(peer->packetThrottleInterval);
  1453. verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(peer->packetThrottleAcceleration);
  1454. verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(peer->packetThrottleDeceleration);
  1455. verifyCommand.verifyConnect.connectID = peer->connectID;
  1456. enet_peer_queue_outgoing_command(peer, &verifyCommand, NULL, 0, 0);
  1457. return peer;
  1458. }
  1459. static int enet_protocol_handle_send_reliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1460. size_t dataLength;
  1461. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1462. return -1;
  1463. dataLength = ENET_NET_TO_HOST_16(command->sendReliable.dataLength);
  1464. *currentData += dataLength;
  1465. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1466. return -1;
  1467. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendReliable), dataLength, ENET_PACKET_FLAG_RELIABLE, 0) == NULL)
  1468. return -1;
  1469. return 0;
  1470. }
  1471. static int enet_protocol_handle_send_unsequenced(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1472. enet_uint32 unsequencedGroup, index;
  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->sendUnsequenced.dataLength);
  1477. *currentData += dataLength;
  1478. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1479. return -1;
  1480. unsequencedGroup = ENET_NET_TO_HOST_16(command->sendUnsequenced.unsequencedGroup);
  1481. index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
  1482. if (unsequencedGroup < peer->incomingUnsequencedGroup)
  1483. unsequencedGroup += 0x10000;
  1484. if (unsequencedGroup >= (enet_uint32)peer->incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE)
  1485. return 0;
  1486. unsequencedGroup &= 0xFFFF;
  1487. if (unsequencedGroup - index != peer->incomingUnsequencedGroup) {
  1488. peer->incomingUnsequencedGroup = unsequencedGroup - index;
  1489. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  1490. } else if (peer->unsequencedWindow[index / 32] & (1 << (index % 32))) {
  1491. return 0;
  1492. }
  1493. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnsequenced), dataLength, ENET_PACKET_FLAG_UNSEQUENCED, 0) == NULL)
  1494. return -1;
  1495. peer->unsequencedWindow[index / 32] |= 1 << (index % 32);
  1496. return 0;
  1497. }
  1498. static int enet_protocol_handle_send_unreliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1499. size_t dataLength;
  1500. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1501. return -1;
  1502. dataLength = ENET_NET_TO_HOST_16(command->sendUnreliable.dataLength);
  1503. *currentData += dataLength;
  1504. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1505. return -1;
  1506. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnreliable), dataLength, 0, 0) == NULL)
  1507. return -1;
  1508. return 0;
  1509. }
  1510. static int enet_protocol_handle_send_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1511. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, startSequenceNumber, totalLength;
  1512. ENetChannel* channel;
  1513. enet_uint16 startWindow, currentWindow;
  1514. ENetListIterator currentCommand;
  1515. ENetIncomingCommand* startCommand = NULL;
  1516. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1517. return -1;
  1518. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1519. *currentData += fragmentLength;
  1520. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1521. return -1;
  1522. channel = &peer->channels[command->header.channelID];
  1523. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1524. startWindow = startSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1525. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1526. if (startSequenceNumber < channel->incomingReliableSequenceNumber)
  1527. startWindow += ENET_PEER_RELIABLE_WINDOWS;
  1528. if (startWindow < currentWindow || startWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1529. return 0;
  1530. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1531. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1532. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1533. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1534. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1535. return -1;
  1536. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1537. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1538. if (startSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1539. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1540. continue;
  1541. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1542. break;
  1543. }
  1544. if (incomingCommand->reliableSequenceNumber <= startSequenceNumber) {
  1545. if (incomingCommand->reliableSequenceNumber < startSequenceNumber)
  1546. break;
  1547. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1548. return -1;
  1549. startCommand = incomingCommand;
  1550. break;
  1551. }
  1552. }
  1553. if (startCommand == NULL) {
  1554. ENetProtocol hostCommand = *command;
  1555. hostCommand.header.reliableSequenceNumber = startSequenceNumber;
  1556. startCommand = enet_peer_queue_incoming_command(peer, &hostCommand, NULL, totalLength, ENET_PACKET_FLAG_RELIABLE, fragmentCount);
  1557. if (startCommand == NULL)
  1558. return -1;
  1559. }
  1560. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1561. --startCommand->fragmentsRemaining;
  1562. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1563. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1564. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1565. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1566. if (startCommand->fragmentsRemaining <= 0)
  1567. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  1568. }
  1569. return 0;
  1570. }
  1571. static int enet_protocol_handle_send_unreliable_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1572. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, reliableSequenceNumber, startSequenceNumber, totalLength;
  1573. enet_uint16 reliableWindow, currentWindow;
  1574. ENetChannel* channel;
  1575. ENetListIterator currentCommand;
  1576. ENetIncomingCommand* startCommand = NULL;
  1577. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1578. return -1;
  1579. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1580. *currentData += fragmentLength;
  1581. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1582. return -1;
  1583. channel = &peer->channels[command->header.channelID];
  1584. reliableSequenceNumber = command->header.reliableSequenceNumber;
  1585. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1586. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1587. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1588. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1589. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  1590. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1591. return 0;
  1592. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && startSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  1593. return 0;
  1594. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1595. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1596. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1597. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1598. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1599. return -1;
  1600. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1601. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1602. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1603. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1604. continue;
  1605. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1606. break;
  1607. }
  1608. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  1609. break;
  1610. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  1611. continue;
  1612. if (incomingCommand->unreliableSequenceNumber <= startSequenceNumber) {
  1613. if (incomingCommand->unreliableSequenceNumber < startSequenceNumber)
  1614. break;
  1615. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1616. return -1;
  1617. startCommand = incomingCommand;
  1618. break;
  1619. }
  1620. }
  1621. if (startCommand == NULL) {
  1622. startCommand = enet_peer_queue_incoming_command(peer, command, NULL, totalLength,
  1623. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED, fragmentCount);
  1624. if (startCommand == NULL)
  1625. return -1;
  1626. }
  1627. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1628. --startCommand->fragmentsRemaining;
  1629. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1630. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1631. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1632. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1633. if (startCommand->fragmentsRemaining <= 0)
  1634. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  1635. }
  1636. return 0;
  1637. }
  1638. static int enet_protocol_handle_ping(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1639. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1640. return -1;
  1641. return 0;
  1642. }
  1643. static int enet_protocol_handle_bandwidth_limit(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1644. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1645. return -1;
  1646. if (peer->incomingBandwidth != 0)
  1647. --host->bandwidthLimitedPeers;
  1648. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.incomingBandwidth);
  1649. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.outgoingBandwidth);
  1650. if (peer->incomingBandwidth != 0)
  1651. ++host->bandwidthLimitedPeers;
  1652. if (peer->incomingBandwidth == 0 && host->outgoingBandwidth == 0)
  1653. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1654. else if (peer->incomingBandwidth == 0 || host->outgoingBandwidth == 0)
  1655. peer->windowSize = (ENET_MAX(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1656. else
  1657. peer->windowSize = (ENET_MIN(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1658. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1659. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1660. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1661. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1662. return 0;
  1663. }
  1664. static int enet_protocol_handle_throttle_configure(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1665. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1666. return -1;
  1667. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleInterval);
  1668. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleAcceleration);
  1669. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleDeceleration);
  1670. return 0;
  1671. }
  1672. static int enet_protocol_handle_disconnect(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1673. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT)
  1674. return 0;
  1675. enet_peer_reset_queues(peer);
  1676. if (peer->state == ENET_PEER_STATE_CONNECTION_SUCCEEDED || peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_CONNECTING) {
  1677. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1678. } else if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1679. if (peer->state == ENET_PEER_STATE_CONNECTION_PENDING)
  1680. host->recalculateBandwidthLimits = 1;
  1681. enet_peer_reset(peer);
  1682. } else if (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  1683. enet_protocol_change_state(host, peer, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT);
  1684. } else {
  1685. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1686. }
  1687. if (peer->state != ENET_PEER_STATE_DISCONNECTED)
  1688. peer->eventData = ENET_NET_TO_HOST_32(command->disconnect.data);
  1689. return 0;
  1690. }
  1691. static int enet_protocol_handle_acknowledge(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1692. enet_uint32 roundTripTime, receivedSentTime, receivedReliableSequenceNumber;
  1693. ENetProtocolCommand commandNumber;
  1694. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE)
  1695. return 0;
  1696. receivedSentTime = ENET_NET_TO_HOST_16(command->acknowledge.receivedSentTime);
  1697. receivedSentTime |= host->serviceTime & 0xFFFF0000;
  1698. if ((receivedSentTime & 0x8000) > (host->serviceTime & 0x8000))
  1699. receivedSentTime -= 0x10000;
  1700. if (ENET_TIME_LESS(host->serviceTime, receivedSentTime))
  1701. return 0;
  1702. roundTripTime = ENET_TIME_DIFFERENCE(host->serviceTime, receivedSentTime);
  1703. if (roundTripTime == 0)
  1704. roundTripTime = 1;
  1705. enet_peer_throttle(peer, roundTripTime);
  1706. if (peer->lastReceiveTime > 0) {
  1707. if (roundTripTime >= peer->roundTripTime) {
  1708. enet_uint32 diff = roundTripTime - peer->roundTripTime;
  1709. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1710. peer->roundTripTimeVariance += diff / 4;
  1711. peer->roundTripTime += diff / 8;
  1712. } else {
  1713. enet_uint32 diff = peer->roundTripTime - roundTripTime;
  1714. if (diff <= peer->roundTripTimeVariance) {
  1715. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1716. peer->roundTripTimeVariance += diff / 4;
  1717. } else {
  1718. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 32;
  1719. peer->roundTripTimeVariance += diff / 32;
  1720. }
  1721. peer->roundTripTime -= diff / 8;
  1722. }
  1723. } else {
  1724. peer->roundTripTime = roundTripTime;
  1725. peer->roundTripTimeVariance = roundTripTime / 2;
  1726. }
  1727. if (peer->roundTripTime < peer->lowestRoundTripTime)
  1728. peer->lowestRoundTripTime = peer->roundTripTime;
  1729. if (peer->roundTripTimeVariance > peer->highestRoundTripTimeVariance)
  1730. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1731. if (peer->packetThrottleEpoch == 0 || ENET_TIME_DIFFERENCE(host->serviceTime, peer->packetThrottleEpoch) >= peer->packetThrottleInterval) {
  1732. peer->lastRoundTripTime = peer->lowestRoundTripTime;
  1733. peer->lastRoundTripTimeVariance = peer->highestRoundTripTimeVariance;
  1734. peer->lowestRoundTripTime = peer->roundTripTime;
  1735. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1736. peer->packetThrottleEpoch = host->serviceTime;
  1737. }
  1738. peer->lastReceiveTime = ENET_MAX(host->serviceTime, 1);
  1739. peer->earliestTimeout = 0;
  1740. receivedReliableSequenceNumber = ENET_NET_TO_HOST_16(command->acknowledge.receivedReliableSequenceNumber);
  1741. commandNumber = enet_protocol_remove_sent_reliable_command(peer, receivedReliableSequenceNumber, command->header.channelID);
  1742. switch (peer->state) {
  1743. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1744. if (commandNumber != ENET_PROTOCOL_COMMAND_VERIFY_CONNECT)
  1745. return -1;
  1746. enet_protocol_notify_connect(host, peer, event);
  1747. break;
  1748. case ENET_PEER_STATE_DISCONNECTING:
  1749. if (commandNumber != ENET_PROTOCOL_COMMAND_DISCONNECT)
  1750. return -1;
  1751. enet_protocol_notify_disconnect(host, peer, event);
  1752. break;
  1753. case ENET_PEER_STATE_DISCONNECT_LATER:
  1754. if (enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1755. enet_peer_disconnect(peer, peer->eventData);
  1756. break;
  1757. default:
  1758. break;
  1759. }
  1760. return 0;
  1761. }
  1762. static int enet_protocol_handle_verify_connect(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1763. enet_uint32 mtu, windowSize;
  1764. size_t channelCount;
  1765. if (peer->state != ENET_PEER_STATE_CONNECTING)
  1766. return 0;
  1767. channelCount = ENET_NET_TO_HOST_32(command->verifyConnect.channelCount);
  1768. 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) {
  1769. peer->eventData = 0;
  1770. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1771. return -1;
  1772. }
  1773. enet_protocol_remove_sent_reliable_command(peer, 1, 0xFF);
  1774. if (channelCount < peer->channelCount)
  1775. peer->channelCount = channelCount;
  1776. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->verifyConnect.outgoingPeerID);
  1777. peer->incomingSessionID = command->verifyConnect.incomingSessionID;
  1778. peer->outgoingSessionID = command->verifyConnect.outgoingSessionID;
  1779. mtu = ENET_NET_TO_HOST_32(command->verifyConnect.mtu);
  1780. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1781. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1782. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1783. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1784. if (mtu < peer->mtu)
  1785. peer->mtu = mtu;
  1786. windowSize = ENET_NET_TO_HOST_32(command->verifyConnect.windowSize);
  1787. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1788. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1789. if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1790. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1791. if (windowSize < peer->windowSize)
  1792. peer->windowSize = windowSize;
  1793. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.incomingBandwidth);
  1794. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.outgoingBandwidth);
  1795. enet_protocol_notify_connect(host, peer, event);
  1796. return 0;
  1797. }
  1798. static int enet_protocol_handle_incoming_commands(ENetHost* host, ENetEvent* event) {
  1799. ENetProtocolHeader* header;
  1800. ENetProtocol* command;
  1801. ENetPeer* peer;
  1802. enet_uint8* currentData;
  1803. size_t headerSize;
  1804. enet_uint16 peerID, flags;
  1805. enet_uint8 sessionID;
  1806. if (host->receivedDataLength < (size_t)&((ENetProtocolHeader*)0)->sentTime)
  1807. return 0;
  1808. header = (ENetProtocolHeader*)host->receivedData;
  1809. peerID = ENET_NET_TO_HOST_16(header->peerID);
  1810. sessionID = (peerID & ENET_PROTOCOL_HEADER_SESSION_MASK) >> ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  1811. flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK;
  1812. peerID &= ~(ENET_PROTOCOL_HEADER_FLAG_MASK | ENET_PROTOCOL_HEADER_SESSION_MASK);
  1813. headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof(ENetProtocolHeader) : (size_t)&((ENetProtocolHeader*)0)->sentTime);
  1814. if (host->checksumCallback != NULL)
  1815. headerSize += sizeof(enet_uint32);
  1816. if (peerID == ENET_PROTOCOL_MAXIMUM_PEER_ID) {
  1817. peer = NULL;
  1818. } else if (peerID >= host->peerCount) {
  1819. return 0;
  1820. } else {
  1821. peer = &host->peers[peerID];
  1822. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || ((!enet_in6_equal(host->receivedAddress.ipv6, peer->address.ipv6) || host->receivedAddress.port != peer->address.port) && peer->address.ipv4.ip.s_addr != INADDR_BROADCAST) || (peer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID && sessionID != peer->incomingSessionID))
  1823. return 0;
  1824. }
  1825. if (host->checksumCallback != NULL) {
  1826. enet_uint32* checksum = (enet_uint32*)&host->receivedData[headerSize - sizeof(enet_uint32)];
  1827. enet_uint32 desiredChecksum = *checksum;
  1828. ENetBuffer buffer;
  1829. *checksum = peer != NULL ? peer->connectID : 0;
  1830. buffer.data = host->receivedData;
  1831. buffer.dataLength = host->receivedDataLength;
  1832. if (host->checksumCallback(&buffer, 1) != desiredChecksum)
  1833. return 0;
  1834. }
  1835. if (peer != NULL) {
  1836. peer->address.ipv6 = host->receivedAddress.ipv6;
  1837. peer->address.port = host->receivedAddress.port;
  1838. peer->incomingDataTotal += host->receivedDataLength;
  1839. peer->totalDataReceived += host->receivedDataLength;
  1840. }
  1841. currentData = host->receivedData + headerSize;
  1842. while (currentData < &host->receivedData[host->receivedDataLength]) {
  1843. enet_uint8 commandNumber;
  1844. size_t commandSize;
  1845. command = (ENetProtocol*)currentData;
  1846. if (currentData + sizeof(ENetProtocolCommandHeader) > &host->receivedData[host->receivedDataLength])
  1847. break;
  1848. commandNumber = command->header.command & ENET_PROTOCOL_COMMAND_MASK;
  1849. if (commandNumber >= ENET_PROTOCOL_COMMAND_COUNT)
  1850. break;
  1851. commandSize = commandSizes[commandNumber];
  1852. if (commandSize == 0 || currentData + commandSize > &host->receivedData[host->receivedDataLength])
  1853. break;
  1854. currentData += commandSize;
  1855. if (peer == NULL && (commandNumber != ENET_PROTOCOL_COMMAND_CONNECT || currentData < &host->receivedData[host->receivedDataLength]))
  1856. break;
  1857. command->header.reliableSequenceNumber = ENET_NET_TO_HOST_16(command->header.reliableSequenceNumber);
  1858. switch (commandNumber) {
  1859. case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE:
  1860. if (enet_protocol_handle_acknowledge(host, event, peer, command))
  1861. goto commandError;
  1862. break;
  1863. case ENET_PROTOCOL_COMMAND_CONNECT:
  1864. if (peer != NULL)
  1865. goto commandError;
  1866. if (host->preventConnections == 0) {
  1867. peer = enet_protocol_handle_connect(host, header, command);
  1868. if (peer == NULL)
  1869. goto commandError;
  1870. }
  1871. break;
  1872. case ENET_PROTOCOL_COMMAND_VERIFY_CONNECT:
  1873. if (enet_protocol_handle_verify_connect(host, event, peer, command))
  1874. goto commandError;
  1875. break;
  1876. case ENET_PROTOCOL_COMMAND_DISCONNECT:
  1877. if (enet_protocol_handle_disconnect(host, peer, command))
  1878. goto commandError;
  1879. break;
  1880. case ENET_PROTOCOL_COMMAND_PING:
  1881. if (enet_protocol_handle_ping(host, peer, command))
  1882. goto commandError;
  1883. break;
  1884. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  1885. if (enet_protocol_handle_send_reliable(host, peer, command, &currentData))
  1886. goto commandError;
  1887. break;
  1888. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  1889. if (enet_protocol_handle_send_unreliable(host, peer, command, &currentData))
  1890. goto commandError;
  1891. break;
  1892. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  1893. if (enet_protocol_handle_send_unsequenced(host, peer, command, &currentData))
  1894. goto commandError;
  1895. break;
  1896. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  1897. if (enet_protocol_handle_send_fragment(host, peer, command, &currentData))
  1898. goto commandError;
  1899. break;
  1900. case ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT:
  1901. if (enet_protocol_handle_bandwidth_limit(host, peer, command))
  1902. goto commandError;
  1903. break;
  1904. case ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE:
  1905. if (enet_protocol_handle_throttle_configure(host, peer, command))
  1906. goto commandError;
  1907. break;
  1908. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  1909. if (enet_protocol_handle_send_unreliable_fragment(host, peer, command, &currentData))
  1910. goto commandError;
  1911. break;
  1912. default:
  1913. goto commandError;
  1914. }
  1915. if (peer != NULL && (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0) {
  1916. enet_uint16 sentTime;
  1917. if (!(flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME))
  1918. break;
  1919. sentTime = ENET_NET_TO_HOST_16(header->sentTime);
  1920. switch (peer->state) {
  1921. case ENET_PEER_STATE_DISCONNECTING:
  1922. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1923. case ENET_PEER_STATE_DISCONNECTED:
  1924. case ENET_PEER_STATE_ZOMBIE:
  1925. break;
  1926. case ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT:
  1927. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  1928. enet_peer_queue_acknowledgement(peer, command, sentTime);
  1929. break;
  1930. default:
  1931. enet_peer_queue_acknowledgement(peer, command, sentTime);
  1932. break;
  1933. }
  1934. }
  1935. }
  1936. commandError:
  1937. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  1938. return 1;
  1939. return 0;
  1940. }
  1941. static int enet_protocol_receive_incoming_commands(ENetHost* host, ENetEvent* event) {
  1942. int packets;
  1943. for (packets = 0; packets < 256; ++packets) {
  1944. int receivedLength;
  1945. ENetBuffer buffer;
  1946. buffer.data = host->packetData[0];
  1947. buffer.dataLength = host->mtu;
  1948. receivedLength = enet_socket_receive(host->socket, &host->receivedAddress, &buffer, 1);
  1949. if (receivedLength == -2)
  1950. continue;
  1951. if (receivedLength < 0)
  1952. return -1;
  1953. if (receivedLength == 0)
  1954. return 0;
  1955. host->receivedData = host->packetData[0];
  1956. host->receivedDataLength = receivedLength;
  1957. host->totalReceivedData += receivedLength;
  1958. host->totalReceivedPackets++;
  1959. if (host->interceptCallback != NULL) {
  1960. switch (host->interceptCallback(host, (void*)event)) {
  1961. case 1:
  1962. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  1963. return 1;
  1964. continue;
  1965. case -1:
  1966. return -1;
  1967. default:
  1968. break;
  1969. }
  1970. }
  1971. switch (enet_protocol_handle_incoming_commands(host, event)) {
  1972. case 1:
  1973. return 1;
  1974. case -1:
  1975. return -1;
  1976. default:
  1977. break;
  1978. }
  1979. }
  1980. return -1;
  1981. }
  1982. static void enet_protocol_send_acknowledgements(ENetHost* host, ENetPeer* peer) {
  1983. ENetProtocol* command = &host->commands[host->commandCount];
  1984. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  1985. ENetAcknowledgement* acknowledgement;
  1986. ENetListIterator currentAcknowledgement;
  1987. enet_uint16 reliableSequenceNumber;
  1988. currentAcknowledgement = enet_list_begin(&peer->acknowledgements);
  1989. while (currentAcknowledgement != enet_list_end(&peer->acknowledgements)) {
  1990. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < sizeof(ENetProtocolAcknowledge)) {
  1991. host->continueSending = 1;
  1992. break;
  1993. }
  1994. acknowledgement = (ENetAcknowledgement*)currentAcknowledgement;
  1995. currentAcknowledgement = enet_list_next(currentAcknowledgement);
  1996. buffer->data = command;
  1997. buffer->dataLength = sizeof(ENetProtocolAcknowledge);
  1998. host->packetSize += buffer->dataLength;
  1999. reliableSequenceNumber = ENET_HOST_TO_NET_16(acknowledgement->command.header.reliableSequenceNumber);
  2000. command->header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
  2001. command->header.channelID = acknowledgement->command.header.channelID;
  2002. command->header.reliableSequenceNumber = reliableSequenceNumber;
  2003. command->acknowledge.receivedReliableSequenceNumber = reliableSequenceNumber;
  2004. command->acknowledge.receivedSentTime = ENET_HOST_TO_NET_16(acknowledgement->sentTime);
  2005. if ((acknowledgement->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2006. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  2007. enet_list_remove(&acknowledgement->acknowledgementList);
  2008. enet_free(acknowledgement);
  2009. ++command;
  2010. ++buffer;
  2011. }
  2012. host->commandCount = command - host->commands;
  2013. host->bufferCount = buffer - host->buffers;
  2014. }
  2015. static void enet_protocol_send_unreliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2016. ENetProtocol* command = &host->commands[host->commandCount];
  2017. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2018. ENetOutgoingCommand* outgoingCommand;
  2019. ENetListIterator currentCommand;
  2020. currentCommand = enet_list_begin(&peer->outgoingUnreliableCommands);
  2021. while (currentCommand != enet_list_end(&peer->outgoingUnreliableCommands)) {
  2022. size_t commandSize;
  2023. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2024. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2025. 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)) {
  2026. host->continueSending = 1;
  2027. break;
  2028. }
  2029. currentCommand = enet_list_next(currentCommand);
  2030. if (outgoingCommand->packet != NULL && outgoingCommand->fragmentOffset == 0) {
  2031. peer->packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER;
  2032. peer->packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE;
  2033. if (!(outgoingCommand->packet->flags & (ENET_PACKET_FLAG_CRUCIAL)) && peer->packetThrottleCounter > peer->packetThrottle) {
  2034. enet_uint16 reliableSequenceNumber = outgoingCommand->reliableSequenceNumber;
  2035. enet_uint16 unreliableSequenceNumber = outgoingCommand->unreliableSequenceNumber;
  2036. for (;;) {
  2037. --outgoingCommand->packet->referenceCount;
  2038. if (outgoingCommand->packet->referenceCount == 0)
  2039. enet_packet_destroy(outgoingCommand->packet);
  2040. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2041. enet_free(outgoingCommand);
  2042. if (currentCommand == enet_list_end(&peer->outgoingUnreliableCommands))
  2043. break;
  2044. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2045. if (outgoingCommand->reliableSequenceNumber != reliableSequenceNumber || outgoingCommand->unreliableSequenceNumber != unreliableSequenceNumber)
  2046. break;
  2047. currentCommand = enet_list_next(currentCommand);
  2048. }
  2049. continue;
  2050. }
  2051. }
  2052. buffer->data = command;
  2053. buffer->dataLength = commandSize;
  2054. host->packetSize += buffer->dataLength;
  2055. *command = outgoingCommand->command;
  2056. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2057. if (outgoingCommand->packet != NULL) {
  2058. ++buffer;
  2059. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2060. buffer->dataLength = outgoingCommand->fragmentLength;
  2061. host->packetSize += buffer->dataLength;
  2062. enet_list_insert(enet_list_end(&peer->sentUnreliableCommands), outgoingCommand);
  2063. } else {
  2064. enet_free(outgoingCommand);
  2065. }
  2066. ++command;
  2067. ++buffer;
  2068. }
  2069. host->commandCount = command - host->commands;
  2070. host->bufferCount = buffer - host->buffers;
  2071. 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))
  2072. enet_peer_disconnect(peer, peer->eventData);
  2073. }
  2074. static int enet_protocol_check_timeouts(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  2075. ENetOutgoingCommand* outgoingCommand;
  2076. ENetListIterator currentCommand, insertPosition;
  2077. currentCommand = enet_list_begin(&peer->sentReliableCommands);
  2078. insertPosition = enet_list_begin(&peer->outgoingReliableCommands);
  2079. while (currentCommand != enet_list_end(&peer->sentReliableCommands)) {
  2080. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2081. currentCommand = enet_list_next(currentCommand);
  2082. if (ENET_TIME_DIFFERENCE(host->serviceTime, outgoingCommand->sentTime) < outgoingCommand->roundTripTimeout)
  2083. continue;
  2084. if (peer->earliestTimeout == 0 || ENET_TIME_LESS(outgoingCommand->sentTime, peer->earliestTimeout))
  2085. peer->earliestTimeout = outgoingCommand->sentTime;
  2086. 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))) {
  2087. enet_protocol_notify_disconnect_timeout(host, peer, event);
  2088. return 1;
  2089. }
  2090. if (outgoingCommand->packet != NULL)
  2091. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  2092. ++peer->packetsLost;
  2093. ++peer->totalPacketsLost;
  2094. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2095. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2096. enet_list_insert(insertPosition, enet_list_remove(&outgoingCommand->outgoingCommandList));
  2097. if (currentCommand == enet_list_begin(&peer->sentReliableCommands) && !enet_list_empty(&peer->sentReliableCommands)) {
  2098. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2099. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  2100. }
  2101. }
  2102. return 0;
  2103. }
  2104. static int enet_protocol_send_reliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2105. ENetProtocol* command = &host->commands[host->commandCount];
  2106. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2107. ENetOutgoingCommand* outgoingCommand;
  2108. ENetListIterator currentCommand;
  2109. ENetChannel* channel;
  2110. enet_uint16 reliableWindow;
  2111. size_t commandSize;
  2112. int windowExceeded = 0, windowWrap = 0, canPing = 1;
  2113. currentCommand = enet_list_begin(&peer->outgoingReliableCommands);
  2114. while (currentCommand != enet_list_end(&peer->outgoingReliableCommands)) {
  2115. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2116. channel = outgoingCommand->command.header.channelID < peer->channelCount ? &peer->channels[outgoingCommand->command.header.channelID] : NULL;
  2117. reliableWindow = outgoingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2118. if (channel != NULL) {
  2119. 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)))))
  2120. windowWrap = 1;
  2121. if (windowWrap) {
  2122. currentCommand = enet_list_next(currentCommand);
  2123. continue;
  2124. }
  2125. }
  2126. if (outgoingCommand->packet != NULL) {
  2127. if (!windowExceeded) {
  2128. enet_uint32 windowSize = (peer->packetThrottle * peer->windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE;
  2129. if (peer->reliableDataInTransit + outgoingCommand->fragmentLength > ENET_MAX(windowSize, peer->mtu))
  2130. windowExceeded = 1;
  2131. }
  2132. if (windowExceeded) {
  2133. currentCommand = enet_list_next(currentCommand);
  2134. continue;
  2135. }
  2136. }
  2137. canPing = 0;
  2138. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2139. 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))) {
  2140. host->continueSending = 1;
  2141. break;
  2142. }
  2143. currentCommand = enet_list_next(currentCommand);
  2144. if (channel != NULL && outgoingCommand->sendAttempts < 1) {
  2145. channel->usedReliableWindows |= 1 << reliableWindow;
  2146. ++channel->reliableWindows[reliableWindow];
  2147. }
  2148. ++outgoingCommand->sendAttempts;
  2149. if (outgoingCommand->roundTripTimeout == 0) {
  2150. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2151. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2152. }
  2153. if (enet_list_empty(&peer->sentReliableCommands))
  2154. peer->nextTimeout = host->serviceTime + outgoingCommand->roundTripTimeout;
  2155. enet_list_insert(enet_list_end(&peer->sentReliableCommands), enet_list_remove(&outgoingCommand->outgoingCommandList));
  2156. outgoingCommand->sentTime = host->serviceTime;
  2157. buffer->data = command;
  2158. buffer->dataLength = commandSize;
  2159. host->packetSize += buffer->dataLength;
  2160. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_SENT_TIME;
  2161. *command = outgoingCommand->command;
  2162. if (outgoingCommand->packet != NULL) {
  2163. ++buffer;
  2164. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2165. buffer->dataLength = outgoingCommand->fragmentLength;
  2166. host->packetSize += outgoingCommand->fragmentLength;
  2167. peer->reliableDataInTransit += outgoingCommand->fragmentLength;
  2168. }
  2169. ++peer->packetsSent;
  2170. ++peer->totalPacketsSent;
  2171. ++command;
  2172. ++buffer;
  2173. }
  2174. host->commandCount = command - host->commands;
  2175. host->bufferCount = buffer - host->buffers;
  2176. return canPing;
  2177. }
  2178. static int enet_protocol_send_outgoing_commands(ENetHost* host, ENetEvent* event, int checkForTimeouts) {
  2179. enet_uint8 headerData[sizeof(ENetProtocolHeader) + sizeof(enet_uint32)];
  2180. ENetProtocolHeader* header = (ENetProtocolHeader*)headerData;
  2181. ENetPeer* currentPeer;
  2182. int sentLength;
  2183. host->continueSending = 1;
  2184. while (host->continueSending) {
  2185. for (host->continueSending = 0, currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2186. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED || currentPeer->state == ENET_PEER_STATE_ZOMBIE)
  2187. continue;
  2188. host->headerFlags = 0;
  2189. host->commandCount = 0;
  2190. host->bufferCount = 1;
  2191. host->packetSize = sizeof(ENetProtocolHeader);
  2192. if (!enet_list_empty(&currentPeer->acknowledgements))
  2193. enet_protocol_send_acknowledgements(host, currentPeer);
  2194. if (checkForTimeouts != 0 && !enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_GREATER_EQUAL(host->serviceTime, currentPeer->nextTimeout) && enet_protocol_check_timeouts(host, currentPeer, event) == 1) {
  2195. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2196. return 1;
  2197. else
  2198. continue;
  2199. }
  2200. 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)) {
  2201. enet_peer_ping(currentPeer);
  2202. enet_protocol_send_reliable_outgoing_commands(host, currentPeer);
  2203. }
  2204. if (!enet_list_empty(&currentPeer->outgoingUnreliableCommands))
  2205. enet_protocol_send_unreliable_outgoing_commands(host, currentPeer);
  2206. if (host->commandCount == 0)
  2207. continue;
  2208. if (currentPeer->packetLossEpoch == 0) {
  2209. currentPeer->packetLossEpoch = host->serviceTime;
  2210. } else if (ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->packetLossEpoch) >= ENET_PEER_PACKET_LOSS_INTERVAL && currentPeer->packetsSent > 0) {
  2211. enet_uint32 packetLoss = currentPeer->packetsLost * ENET_PEER_PACKET_LOSS_SCALE / currentPeer->packetsSent;
  2212. #ifdef ENET_DEBUG
  2213. printf(
  2214. "peer %u: %f%%+-%f%% packet loss, %u+-%u ms round trip time, %f%% throttle, %u/%u outgoing, %u/%u incoming\n", currentPeer->incomingPeerID,
  2215. currentPeer->packetLoss / (float)ENET_PEER_PACKET_LOSS_SCALE,
  2216. currentPeer->packetLossVariance / (float)ENET_PEER_PACKET_LOSS_SCALE, currentPeer->roundTripTime, currentPeer->roundTripTimeVariance,
  2217. currentPeer->packetThrottle / (float)ENET_PEER_PACKET_THROTTLE_SCALE,
  2218. enet_list_size(&currentPeer->outgoingReliableCommands),
  2219. enet_list_size(&currentPeer->outgoingUnreliableCommands),
  2220. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingReliableCommands) : 0,
  2221. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingUnreliableCommands) : 0
  2222. );
  2223. #endif
  2224. currentPeer->packetLossVariance -= currentPeer->packetLossVariance / 4;
  2225. if (packetLoss >= currentPeer->packetLoss) {
  2226. currentPeer->packetLoss += (packetLoss - currentPeer->packetLoss) / 8;
  2227. currentPeer->packetLossVariance += (packetLoss - currentPeer->packetLoss) / 4;
  2228. } else {
  2229. currentPeer->packetLoss -= (currentPeer->packetLoss - packetLoss) / 8;
  2230. currentPeer->packetLossVariance += (currentPeer->packetLoss - packetLoss) / 4;
  2231. }
  2232. currentPeer->packetLossEpoch = host->serviceTime;
  2233. currentPeer->packetsSent = 0;
  2234. currentPeer->packetsLost = 0;
  2235. }
  2236. host->buffers->data = headerData;
  2237. if (host->headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME) {
  2238. header->sentTime = ENET_HOST_TO_NET_16(host->serviceTime & 0xFFFF);
  2239. host->buffers->dataLength = sizeof(ENetProtocolHeader);
  2240. } else {
  2241. host->buffers->dataLength = (size_t)&((ENetProtocolHeader*)0)->sentTime;
  2242. }
  2243. if (currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2244. host->headerFlags |= currentPeer->outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  2245. header->peerID = ENET_HOST_TO_NET_16(currentPeer->outgoingPeerID | host->headerFlags);
  2246. if (host->checksumCallback != NULL) {
  2247. enet_uint32* checksum = (enet_uint32*)&headerData[host->buffers->dataLength];
  2248. *checksum = currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer->connectID : 0;
  2249. host->buffers->dataLength += sizeof(enet_uint32);
  2250. *checksum = host->checksumCallback(host->buffers, host->bufferCount);
  2251. }
  2252. currentPeer->lastSendTime = host->serviceTime;
  2253. sentLength = enet_socket_send(host->socket, &currentPeer->address, host->buffers, host->bufferCount);
  2254. enet_protocol_remove_sent_unreliable_commands(currentPeer);
  2255. if (sentLength < 0)
  2256. return -1;
  2257. host->totalSentData += sentLength;
  2258. currentPeer->totalDataSent += sentLength;
  2259. host->totalSentPackets++;
  2260. }
  2261. }
  2262. return 0;
  2263. }
  2264. void enet_host_flush(ENetHost* host) {
  2265. host->serviceTime = enet_time_get();
  2266. enet_protocol_send_outgoing_commands(host, NULL, 0);
  2267. }
  2268. int enet_host_check_events(ENetHost* host, ENetEvent* event) {
  2269. if (event == NULL)
  2270. return -1;
  2271. event->type = ENET_EVENT_TYPE_NONE;
  2272. event->peer = NULL;
  2273. event->packet = NULL;
  2274. return enet_protocol_dispatch_incoming_commands(host, event);
  2275. }
  2276. int enet_host_service(ENetHost* host, ENetEvent* event, enet_uint32 timeout) {
  2277. enet_uint32 waitCondition;
  2278. if (event != NULL) {
  2279. event->type = ENET_EVENT_TYPE_NONE;
  2280. event->peer = NULL;
  2281. event->packet = NULL;
  2282. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2283. case 1:
  2284. return 1;
  2285. case -1:
  2286. #ifdef ENET_DEBUG
  2287. perror("Error dispatching incoming packets");
  2288. #endif
  2289. return -1;
  2290. default:
  2291. break;
  2292. }
  2293. }
  2294. host->serviceTime = enet_time_get();
  2295. timeout += host->serviceTime;
  2296. do {
  2297. if (ENET_TIME_DIFFERENCE(host->serviceTime, host->bandwidthThrottleEpoch) >= ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  2298. enet_host_bandwidth_throttle(host);
  2299. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2300. case 1:
  2301. return 1;
  2302. case -1:
  2303. #ifdef ENET_DEBUG
  2304. perror("Error sending outgoing packets");
  2305. #endif
  2306. return -1;
  2307. default:
  2308. break;
  2309. }
  2310. switch (enet_protocol_receive_incoming_commands(host, event)) {
  2311. case 1:
  2312. return 1;
  2313. case -1:
  2314. #ifdef ENET_DEBUG
  2315. perror("Error receiving incoming packets");
  2316. #endif
  2317. return -1;
  2318. default:
  2319. break;
  2320. }
  2321. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2322. case 1:
  2323. return 1;
  2324. case -1:
  2325. #ifdef ENET_DEBUG
  2326. perror("Error sending outgoing packets");
  2327. #endif
  2328. return -1;
  2329. default:
  2330. break;
  2331. }
  2332. if (event != NULL) {
  2333. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2334. case 1:
  2335. return 1;
  2336. case -1:
  2337. #ifdef ENET_DEBUG
  2338. perror("Error dispatching incoming packets");
  2339. #endif
  2340. return -1;
  2341. default:
  2342. break;
  2343. }
  2344. }
  2345. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2346. return 0;
  2347. do {
  2348. host->serviceTime = enet_time_get();
  2349. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2350. return 0;
  2351. waitCondition = ENET_SOCKET_WAIT_RECEIVE | ENET_SOCKET_WAIT_INTERRUPT;
  2352. if (enet_socket_wait(host->socket, &waitCondition, ENET_TIME_DIFFERENCE(timeout, host->serviceTime)) != 0)
  2353. return -1;
  2354. }
  2355. while (waitCondition & ENET_SOCKET_WAIT_INTERRUPT);
  2356. host->serviceTime = enet_time_get();
  2357. }
  2358. while (waitCondition & ENET_SOCKET_WAIT_RECEIVE);
  2359. return 0;
  2360. }
  2361. /*
  2362. =======================================================================
  2363. Peer
  2364. =======================================================================
  2365. */
  2366. void enet_peer_throttle_configure(ENetPeer* peer, enet_uint32 interval, enet_uint32 acceleration, enet_uint32 deceleration, enet_uint32 threshold) {
  2367. ENetProtocol command;
  2368. peer->packetThrottleThreshold = threshold;
  2369. peer->packetThrottleInterval = interval;
  2370. peer->packetThrottleAcceleration = acceleration;
  2371. peer->packetThrottleDeceleration = deceleration;
  2372. command.header.command = ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2373. command.header.channelID = 0xFF;
  2374. command.throttleConfigure.packetThrottleInterval = ENET_HOST_TO_NET_32(interval);
  2375. command.throttleConfigure.packetThrottleAcceleration = ENET_HOST_TO_NET_32(acceleration);
  2376. command.throttleConfigure.packetThrottleDeceleration = ENET_HOST_TO_NET_32(deceleration);
  2377. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2378. }
  2379. int enet_peer_throttle(ENetPeer* peer, enet_uint32 rtt) {
  2380. if (peer->lastRoundTripTime <= peer->lastRoundTripTimeVariance) {
  2381. peer->packetThrottle = peer->packetThrottleLimit;
  2382. } else if (rtt < peer->lastRoundTripTime) {
  2383. peer->packetThrottle += peer->packetThrottleAcceleration;
  2384. if (peer->packetThrottle > peer->packetThrottleLimit)
  2385. peer->packetThrottle = peer->packetThrottleLimit;
  2386. return 1;
  2387. } else if (rtt > peer->lastRoundTripTime + peer->packetThrottleThreshold + 2 * peer->lastRoundTripTimeVariance) {
  2388. if (peer->packetThrottle > peer->packetThrottleDeceleration)
  2389. peer->packetThrottle -= peer->packetThrottleDeceleration;
  2390. else
  2391. peer->packetThrottle = 0;
  2392. return -1;
  2393. }
  2394. return 0;
  2395. }
  2396. int enet_peer_send(ENetPeer* peer, enet_uint8 channelID, ENetPacket* packet) {
  2397. ENetChannel* channel = &peer->channels[channelID];
  2398. ENetProtocol command;
  2399. size_t fragmentLength;
  2400. if (peer->state != ENET_PEER_STATE_CONNECTED || channelID >= peer->channelCount || packet->dataLength > peer->host->maximumPacketSize)
  2401. return -1;
  2402. fragmentLength = peer->mtu - sizeof(ENetProtocolHeader) - sizeof(ENetProtocolSendFragment);
  2403. if (peer->host->checksumCallback != NULL)
  2404. fragmentLength -= sizeof(enet_uint32);
  2405. if (packet->dataLength > fragmentLength) {
  2406. enet_uint32 fragmentCount = (packet->dataLength + fragmentLength - 1) / fragmentLength, fragmentNumber, fragmentOffset;
  2407. enet_uint8 commandNumber;
  2408. enet_uint16 startSequenceNumber;
  2409. ENetList fragments;
  2410. ENetOutgoingCommand* fragment;
  2411. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2412. return -1;
  2413. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED)) == ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED && channel->outgoingUnreliableSequenceNumber < 0xFFFF) {
  2414. commandNumber = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT;
  2415. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingUnreliableSequenceNumber + 1);
  2416. } else {
  2417. commandNumber = ENET_PROTOCOL_COMMAND_SEND_FRAGMENT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2418. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingReliableSequenceNumber + 1);
  2419. }
  2420. enet_list_clear(&fragments);
  2421. for (fragmentNumber = 0, fragmentOffset = 0; fragmentOffset < packet->dataLength; ++fragmentNumber, fragmentOffset += fragmentLength) {
  2422. if (packet->dataLength - fragmentOffset < fragmentLength)
  2423. fragmentLength = packet->dataLength - fragmentOffset;
  2424. fragment = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2425. if (fragment == NULL) {
  2426. while (!enet_list_empty(&fragments)) {
  2427. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2428. enet_free(fragment);
  2429. }
  2430. return -1;
  2431. }
  2432. fragment->fragmentOffset = fragmentOffset;
  2433. fragment->fragmentLength = fragmentLength;
  2434. fragment->packet = packet;
  2435. fragment->command.header.command = commandNumber;
  2436. fragment->command.header.channelID = channelID;
  2437. fragment->command.sendFragment.startSequenceNumber = startSequenceNumber;
  2438. fragment->command.sendFragment.dataLength = ENET_HOST_TO_NET_16(fragmentLength);
  2439. fragment->command.sendFragment.fragmentCount = ENET_HOST_TO_NET_32(fragmentCount);
  2440. fragment->command.sendFragment.fragmentNumber = ENET_HOST_TO_NET_32(fragmentNumber);
  2441. fragment->command.sendFragment.totalLength = ENET_HOST_TO_NET_32(packet->dataLength);
  2442. fragment->command.sendFragment.fragmentOffset = ENET_NET_TO_HOST_32(fragmentOffset);
  2443. enet_list_insert(enet_list_end(&fragments), fragment);
  2444. }
  2445. packet->referenceCount += fragmentNumber;
  2446. while (!enet_list_empty(&fragments)) {
  2447. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2448. enet_peer_setup_outgoing_command(peer, fragment);
  2449. }
  2450. return 0;
  2451. }
  2452. command.header.channelID = channelID;
  2453. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNSEQUENCED)) == ENET_PACKET_FLAG_UNSEQUENCED) {
  2454. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2455. command.sendUnsequenced.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2456. } else if (packet->flags & ENET_PACKET_FLAG_RELIABLE || channel->outgoingUnreliableSequenceNumber >= 0xFFFF) {
  2457. command.header.command = ENET_PROTOCOL_COMMAND_SEND_RELIABLE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2458. command.sendReliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2459. } else {
  2460. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE;
  2461. command.sendUnreliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2462. }
  2463. if (enet_peer_queue_outgoing_command(peer, &command, packet, 0, packet->dataLength) == NULL)
  2464. return -1;
  2465. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  2466. enet_host_flush(peer->host);
  2467. return 0;
  2468. }
  2469. ENetPacket* enet_peer_receive(ENetPeer* peer, enet_uint8* channelID) {
  2470. ENetIncomingCommand* incomingCommand;
  2471. ENetPacket* packet;
  2472. if (enet_list_empty(&peer->dispatchedCommands))
  2473. return NULL;
  2474. incomingCommand = (ENetIncomingCommand*)enet_list_remove(enet_list_begin(&peer->dispatchedCommands));
  2475. if (channelID != NULL)
  2476. *channelID = incomingCommand->command.header.channelID;
  2477. packet = incomingCommand->packet;
  2478. --packet->referenceCount;
  2479. if (incomingCommand->fragments != NULL)
  2480. enet_free(incomingCommand->fragments);
  2481. enet_free(incomingCommand);
  2482. peer->totalWaitingData -= packet->dataLength;
  2483. return packet;
  2484. }
  2485. static void enet_peer_reset_outgoing_commands(ENetList* queue) {
  2486. ENetOutgoingCommand* outgoingCommand;
  2487. while (!enet_list_empty(queue)) {
  2488. outgoingCommand = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(queue));
  2489. if (outgoingCommand->packet != NULL) {
  2490. --outgoingCommand->packet->referenceCount;
  2491. if (outgoingCommand->packet->referenceCount == 0)
  2492. enet_packet_destroy(outgoingCommand->packet);
  2493. }
  2494. enet_free(outgoingCommand);
  2495. }
  2496. }
  2497. static void enet_peer_remove_incoming_commands(ENetList* queue, ENetListIterator startCommand, ENetListIterator endCommand) {
  2498. ENetListIterator currentCommand;
  2499. for (currentCommand = startCommand; currentCommand != endCommand;) {
  2500. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2501. currentCommand = enet_list_next(currentCommand);
  2502. enet_list_remove(&incomingCommand->incomingCommandList);
  2503. if (incomingCommand->packet != NULL) {
  2504. --incomingCommand->packet->referenceCount;
  2505. if (incomingCommand->packet->referenceCount == 0)
  2506. enet_packet_destroy(incomingCommand->packet);
  2507. }
  2508. if (incomingCommand->fragments != NULL)
  2509. enet_free(incomingCommand->fragments);
  2510. enet_free(incomingCommand);
  2511. }
  2512. }
  2513. static void enet_peer_reset_incoming_commands(ENetList* queue) {
  2514. enet_peer_remove_incoming_commands(queue, enet_list_begin(queue), enet_list_end(queue));
  2515. }
  2516. void enet_peer_reset_queues(ENetPeer* peer) {
  2517. ENetChannel* channel;
  2518. if (peer->needsDispatch) {
  2519. enet_list_remove(&peer->dispatchList);
  2520. peer->needsDispatch = 0;
  2521. }
  2522. while (!enet_list_empty(&peer->acknowledgements)) {
  2523. enet_free(enet_list_remove(enet_list_begin(&peer->acknowledgements)));
  2524. }
  2525. enet_peer_reset_outgoing_commands(&peer->sentReliableCommands);
  2526. enet_peer_reset_outgoing_commands(&peer->sentUnreliableCommands);
  2527. enet_peer_reset_outgoing_commands(&peer->outgoingReliableCommands);
  2528. enet_peer_reset_outgoing_commands(&peer->outgoingUnreliableCommands);
  2529. enet_peer_reset_incoming_commands(&peer->dispatchedCommands);
  2530. if (peer->channels != NULL && peer->channelCount > 0) {
  2531. for (channel = peer->channels; channel < &peer->channels[peer->channelCount]; ++channel) {
  2532. enet_peer_reset_incoming_commands(&channel->incomingReliableCommands);
  2533. enet_peer_reset_incoming_commands(&channel->incomingUnreliableCommands);
  2534. }
  2535. enet_free(peer->channels);
  2536. }
  2537. peer->channels = NULL;
  2538. peer->channelCount = 0;
  2539. }
  2540. void enet_peer_on_connect(ENetPeer* peer) {
  2541. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  2542. if (peer->incomingBandwidth != 0)
  2543. ++peer->host->bandwidthLimitedPeers;
  2544. ++peer->host->connectedPeers;
  2545. }
  2546. }
  2547. void enet_peer_on_disconnect(ENetPeer* peer) {
  2548. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2549. if (peer->incomingBandwidth != 0)
  2550. --peer->host->bandwidthLimitedPeers;
  2551. --peer->host->connectedPeers;
  2552. }
  2553. }
  2554. void enet_peer_reset(ENetPeer* peer) {
  2555. enet_peer_on_disconnect(peer);
  2556. peer->outgoingPeerID = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  2557. peer->state = ENET_PEER_STATE_DISCONNECTED;
  2558. peer->incomingBandwidth = 0;
  2559. peer->outgoingBandwidth = 0;
  2560. peer->incomingBandwidthThrottleEpoch = 0;
  2561. peer->outgoingBandwidthThrottleEpoch = 0;
  2562. peer->incomingDataTotal = 0;
  2563. peer->totalDataReceived = 0;
  2564. peer->outgoingDataTotal = 0;
  2565. peer->totalDataSent = 0;
  2566. peer->lastSendTime = 0;
  2567. peer->lastReceiveTime = 0;
  2568. peer->nextTimeout = 0;
  2569. peer->earliestTimeout = 0;
  2570. peer->packetLossEpoch = 0;
  2571. peer->packetsSent = 0;
  2572. peer->totalPacketsSent = 0;
  2573. peer->packetsLost = 0;
  2574. peer->totalPacketsLost = 0;
  2575. peer->packetLoss = 0;
  2576. peer->packetLossVariance = 0;
  2577. peer->packetThrottle = ENET_PEER_DEFAULT_PACKET_THROTTLE;
  2578. peer->packetThrottleThreshold = ENET_PEER_PACKET_THROTTLE_THRESHOLD;
  2579. peer->packetThrottleLimit = ENET_PEER_PACKET_THROTTLE_SCALE;
  2580. peer->packetThrottleCounter = 0;
  2581. peer->packetThrottleEpoch = 0;
  2582. peer->packetThrottleAcceleration = ENET_PEER_PACKET_THROTTLE_ACCELERATION;
  2583. peer->packetThrottleDeceleration = ENET_PEER_PACKET_THROTTLE_DECELERATION;
  2584. peer->packetThrottleInterval = ENET_PEER_PACKET_THROTTLE_INTERVAL;
  2585. peer->pingInterval = ENET_PEER_PING_INTERVAL;
  2586. peer->timeoutLimit = ENET_PEER_TIMEOUT_LIMIT;
  2587. peer->timeoutMinimum = ENET_PEER_TIMEOUT_MINIMUM;
  2588. peer->timeoutMaximum = ENET_PEER_TIMEOUT_MAXIMUM;
  2589. peer->lastRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2590. peer->lowestRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2591. peer->lastRoundTripTimeVariance = 0;
  2592. peer->highestRoundTripTimeVariance = 0;
  2593. peer->roundTripTime = 1;
  2594. peer->roundTripTimeVariance = 0;
  2595. peer->mtu = peer->host->mtu;
  2596. peer->reliableDataInTransit = 0;
  2597. peer->outgoingReliableSequenceNumber = 0;
  2598. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  2599. peer->incomingUnsequencedGroup = 0;
  2600. peer->outgoingUnsequencedGroup = 0;
  2601. peer->eventData = 0;
  2602. peer->totalWaitingData = 0;
  2603. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  2604. enet_peer_reset_queues(peer);
  2605. }
  2606. void enet_peer_ping(ENetPeer* peer) {
  2607. ENetProtocol command;
  2608. if (peer->state != ENET_PEER_STATE_CONNECTED)
  2609. return;
  2610. command.header.command = ENET_PROTOCOL_COMMAND_PING | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2611. command.header.channelID = 0xFF;
  2612. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2613. }
  2614. void enet_peer_ping_interval(ENetPeer* peer, enet_uint32 pingInterval) {
  2615. peer->pingInterval = pingInterval ? pingInterval : ENET_PEER_PING_INTERVAL;
  2616. }
  2617. void enet_peer_timeout(ENetPeer* peer, enet_uint32 timeoutLimit, enet_uint32 timeoutMinimum, enet_uint32 timeoutMaximum) {
  2618. peer->timeoutLimit = timeoutLimit ? timeoutLimit : ENET_PEER_TIMEOUT_LIMIT;
  2619. peer->timeoutMinimum = timeoutMinimum ? timeoutMinimum : ENET_PEER_TIMEOUT_MINIMUM;
  2620. peer->timeoutMaximum = timeoutMaximum ? timeoutMaximum : ENET_PEER_TIMEOUT_MAXIMUM;
  2621. }
  2622. void enet_peer_disconnect_now(ENetPeer* peer, enet_uint32 data) {
  2623. ENetProtocol command;
  2624. if (peer->state == ENET_PEER_STATE_DISCONNECTED)
  2625. return;
  2626. if (peer->state != ENET_PEER_STATE_ZOMBIE && peer->state != ENET_PEER_STATE_DISCONNECTING) {
  2627. enet_peer_reset_queues(peer);
  2628. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2629. command.header.channelID = 0xFF;
  2630. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2631. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2632. enet_host_flush(peer->host);
  2633. }
  2634. enet_peer_reset(peer);
  2635. }
  2636. void enet_peer_disconnect(ENetPeer* peer, enet_uint32 data) {
  2637. ENetProtocol command;
  2638. 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)
  2639. return;
  2640. enet_peer_reset_queues(peer);
  2641. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT;
  2642. command.header.channelID = 0xFF;
  2643. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2644. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2645. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2646. else
  2647. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2648. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2649. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2650. enet_peer_on_disconnect(peer);
  2651. peer->state = ENET_PEER_STATE_DISCONNECTING;
  2652. } else {
  2653. enet_host_flush(peer->host);
  2654. enet_peer_reset(peer);
  2655. }
  2656. }
  2657. void enet_peer_disconnect_later(ENetPeer* peer, enet_uint32 data) {
  2658. 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))) {
  2659. peer->state = ENET_PEER_STATE_DISCONNECT_LATER;
  2660. peer->eventData = data;
  2661. } else {
  2662. enet_peer_disconnect(peer, data);
  2663. }
  2664. }
  2665. ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer* peer, const ENetProtocol* command, enet_uint16 sentTime) {
  2666. ENetAcknowledgement* acknowledgement;
  2667. if (command->header.channelID < peer->channelCount) {
  2668. ENetChannel* channel = &peer->channels[command->header.channelID];
  2669. enet_uint16 reliableWindow = command->header.reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2670. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2671. if (command->header.reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2672. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2673. if (reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1 && reliableWindow <= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS)
  2674. return NULL;
  2675. }
  2676. acknowledgement = (ENetAcknowledgement*)enet_malloc(sizeof(ENetAcknowledgement));
  2677. if (acknowledgement == NULL)
  2678. return NULL;
  2679. peer->outgoingDataTotal += sizeof(ENetProtocolAcknowledge);
  2680. acknowledgement->sentTime = sentTime;
  2681. acknowledgement->command = *command;
  2682. enet_list_insert(enet_list_end(&peer->acknowledgements), acknowledgement);
  2683. return acknowledgement;
  2684. }
  2685. void enet_peer_setup_outgoing_command(ENetPeer* peer, ENetOutgoingCommand* outgoingCommand) {
  2686. ENetChannel* channel = &peer->channels[outgoingCommand->command.header.channelID];
  2687. peer->outgoingDataTotal += enet_protocol_command_size(outgoingCommand->command.header.command) + outgoingCommand->fragmentLength;
  2688. if (outgoingCommand->command.header.channelID == 0xFF) {
  2689. ++peer->outgoingReliableSequenceNumber;
  2690. outgoingCommand->reliableSequenceNumber = peer->outgoingReliableSequenceNumber;
  2691. outgoingCommand->unreliableSequenceNumber = 0;
  2692. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2693. ++channel->outgoingReliableSequenceNumber;
  2694. channel->outgoingUnreliableSequenceNumber = 0;
  2695. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2696. outgoingCommand->unreliableSequenceNumber = 0;
  2697. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED) {
  2698. ++peer->outgoingUnsequencedGroup;
  2699. outgoingCommand->reliableSequenceNumber = 0;
  2700. outgoingCommand->unreliableSequenceNumber = 0;
  2701. } else {
  2702. if (outgoingCommand->fragmentOffset == 0)
  2703. ++channel->outgoingUnreliableSequenceNumber;
  2704. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2705. outgoingCommand->unreliableSequenceNumber = channel->outgoingUnreliableSequenceNumber;
  2706. }
  2707. outgoingCommand->sendAttempts = 0;
  2708. outgoingCommand->sentTime = 0;
  2709. outgoingCommand->roundTripTimeout = 0;
  2710. outgoingCommand->roundTripTimeoutLimit = 0;
  2711. outgoingCommand->command.header.reliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->reliableSequenceNumber);
  2712. switch (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2713. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2714. outgoingCommand->command.sendUnreliable.unreliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->unreliableSequenceNumber);
  2715. break;
  2716. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2717. outgoingCommand->command.sendUnsequenced.unsequencedGroup = ENET_HOST_TO_NET_16(peer->outgoingUnsequencedGroup);
  2718. break;
  2719. default:
  2720. break;
  2721. }
  2722. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)
  2723. enet_list_insert(enet_list_end(&peer->outgoingReliableCommands), outgoingCommand);
  2724. else
  2725. enet_list_insert(enet_list_end(&peer->outgoingUnreliableCommands), outgoingCommand);
  2726. }
  2727. ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer* peer, const ENetProtocol* command, ENetPacket* packet, enet_uint32 offset, enet_uint16 length) {
  2728. ENetOutgoingCommand* outgoingCommand = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2729. if (outgoingCommand == NULL)
  2730. return NULL;
  2731. outgoingCommand->command = *command;
  2732. outgoingCommand->fragmentOffset = offset;
  2733. outgoingCommand->fragmentLength = length;
  2734. outgoingCommand->packet = packet;
  2735. if (packet != NULL)
  2736. ++packet->referenceCount;
  2737. enet_peer_setup_outgoing_command(peer, outgoingCommand);
  2738. return outgoingCommand;
  2739. }
  2740. void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2741. ENetListIterator droppedCommand, startCommand, currentCommand;
  2742. for (droppedCommand = startCommand = currentCommand = enet_list_begin(&channel->incomingUnreliableCommands); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2743. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2744. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2745. continue;
  2746. if (incomingCommand->reliableSequenceNumber == channel->incomingReliableSequenceNumber) {
  2747. if (incomingCommand->fragmentsRemaining <= 0) {
  2748. channel->incomingUnreliableSequenceNumber = incomingCommand->unreliableSequenceNumber;
  2749. continue;
  2750. }
  2751. if (startCommand != currentCommand) {
  2752. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2753. if (!peer->needsDispatch) {
  2754. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2755. peer->needsDispatch = 1;
  2756. }
  2757. droppedCommand = currentCommand;
  2758. } else if (droppedCommand != currentCommand) {
  2759. droppedCommand = enet_list_previous(currentCommand);
  2760. }
  2761. } else {
  2762. enet_uint16 reliableWindow = incomingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2763. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2764. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2765. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2766. if (reliableWindow >= currentWindow && reliableWindow < currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2767. break;
  2768. droppedCommand = enet_list_next(currentCommand);
  2769. if (startCommand != currentCommand) {
  2770. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2771. if (!peer->needsDispatch) {
  2772. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2773. peer->needsDispatch = 1;
  2774. }
  2775. }
  2776. }
  2777. startCommand = enet_list_next(currentCommand);
  2778. }
  2779. if (startCommand != currentCommand) {
  2780. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2781. if (!peer->needsDispatch) {
  2782. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2783. peer->needsDispatch = 1;
  2784. }
  2785. droppedCommand = currentCommand;
  2786. }
  2787. enet_peer_remove_incoming_commands(&channel->incomingUnreliableCommands, enet_list_begin(&channel->incomingUnreliableCommands), droppedCommand);
  2788. }
  2789. void enet_peer_dispatch_incoming_reliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2790. ENetListIterator currentCommand;
  2791. for (currentCommand = enet_list_begin(&channel->incomingReliableCommands); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2792. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2793. if (incomingCommand->fragmentsRemaining > 0 || incomingCommand->reliableSequenceNumber != (enet_uint16)(channel->incomingReliableSequenceNumber + 1))
  2794. break;
  2795. channel->incomingReliableSequenceNumber = incomingCommand->reliableSequenceNumber;
  2796. if (incomingCommand->fragmentCount > 0)
  2797. channel->incomingReliableSequenceNumber += incomingCommand->fragmentCount - 1;
  2798. }
  2799. if (currentCommand == enet_list_begin(&channel->incomingReliableCommands))
  2800. return;
  2801. channel->incomingUnreliableSequenceNumber = 0;
  2802. enet_list_move(enet_list_end(&peer->dispatchedCommands), enet_list_begin(&channel->incomingReliableCommands), enet_list_previous(currentCommand));
  2803. if (!peer->needsDispatch) {
  2804. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2805. peer->needsDispatch = 1;
  2806. }
  2807. if (!enet_list_empty(&channel->incomingUnreliableCommands))
  2808. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2809. }
  2810. ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer* peer, const ENetProtocol* command, const void* data, size_t dataLength, enet_uint32 flags, enet_uint32 fragmentCount) {
  2811. static ENetIncomingCommand dummyCommand;
  2812. ENetChannel* channel = &peer->channels[command->header.channelID];
  2813. enet_uint32 unreliableSequenceNumber = 0, reliableSequenceNumber = 0;
  2814. enet_uint16 reliableWindow, currentWindow;
  2815. ENetIncomingCommand* incomingCommand;
  2816. ENetListIterator currentCommand;
  2817. ENetPacket* packet = NULL;
  2818. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2819. goto discardCommand;
  2820. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) {
  2821. reliableSequenceNumber = command->header.reliableSequenceNumber;
  2822. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2823. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2824. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2825. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2826. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2827. goto discardCommand;
  2828. }
  2829. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2830. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2831. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2832. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber)
  2833. goto discardCommand;
  2834. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2835. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2836. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2837. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2838. continue;
  2839. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2840. break;
  2841. }
  2842. if (incomingCommand->reliableSequenceNumber <= reliableSequenceNumber) {
  2843. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2844. break;
  2845. goto discardCommand;
  2846. }
  2847. }
  2848. break;
  2849. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2850. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  2851. unreliableSequenceNumber = ENET_NET_TO_HOST_16(command->sendUnreliable.unreliableSequenceNumber);
  2852. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && unreliableSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  2853. goto discardCommand;
  2854. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2855. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2856. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2857. continue;
  2858. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2859. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2860. continue;
  2861. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2862. break;
  2863. }
  2864. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2865. break;
  2866. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  2867. continue;
  2868. if (incomingCommand->unreliableSequenceNumber <= unreliableSequenceNumber) {
  2869. if (incomingCommand->unreliableSequenceNumber < unreliableSequenceNumber)
  2870. break;
  2871. goto discardCommand;
  2872. }
  2873. }
  2874. break;
  2875. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2876. currentCommand = enet_list_end(&channel->incomingUnreliableCommands);
  2877. break;
  2878. default:
  2879. goto discardCommand;
  2880. }
  2881. if (peer->totalWaitingData >= peer->host->maximumWaitingData)
  2882. goto notifyError;
  2883. packet = enet_packet_create(data, dataLength, flags);
  2884. if (packet == NULL)
  2885. goto notifyError;
  2886. incomingCommand = (ENetIncomingCommand*)enet_malloc(sizeof(ENetIncomingCommand));
  2887. if (incomingCommand == NULL)
  2888. goto notifyError;
  2889. incomingCommand->reliableSequenceNumber = command->header.reliableSequenceNumber;
  2890. incomingCommand->unreliableSequenceNumber = unreliableSequenceNumber & 0xFFFF;
  2891. incomingCommand->command = *command;
  2892. incomingCommand->fragmentCount = fragmentCount;
  2893. incomingCommand->fragmentsRemaining = fragmentCount;
  2894. incomingCommand->packet = packet;
  2895. incomingCommand->fragments = NULL;
  2896. if (fragmentCount > 0) {
  2897. if (fragmentCount <= ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2898. incomingCommand->fragments = (enet_uint32*)enet_malloc((fragmentCount + 31) / 32 * sizeof(enet_uint32));
  2899. if (incomingCommand->fragments == NULL) {
  2900. enet_free(incomingCommand);
  2901. goto notifyError;
  2902. }
  2903. memset(incomingCommand->fragments, 0, (fragmentCount + 31) / 32 * sizeof(enet_uint32));
  2904. }
  2905. if (packet != NULL) {
  2906. ++packet->referenceCount;
  2907. peer->totalWaitingData += packet->dataLength;
  2908. }
  2909. enet_list_insert(enet_list_next(currentCommand), incomingCommand);
  2910. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2911. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2912. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2913. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  2914. break;
  2915. default:
  2916. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2917. break;
  2918. }
  2919. return incomingCommand;
  2920. discardCommand:
  2921. if (fragmentCount > 0)
  2922. goto notifyError;
  2923. if (packet != NULL && packet->referenceCount == 0)
  2924. enet_packet_destroy(packet);
  2925. return &dummyCommand;
  2926. notifyError:
  2927. if (packet != NULL && packet->referenceCount == 0)
  2928. enet_packet_destroy(packet);
  2929. return NULL;
  2930. }
  2931. /*
  2932. =======================================================================
  2933. Host
  2934. =======================================================================
  2935. */
  2936. ENetHost* enet_host_create(const ENetAddress* address, size_t peerCount, size_t channelLimit, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth, int bufferSize) {
  2937. ENetHost* host;
  2938. ENetPeer* currentPeer;
  2939. if (peerCount > ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2940. return NULL;
  2941. host = (ENetHost*)enet_malloc(sizeof(ENetHost));
  2942. if (host == NULL)
  2943. return NULL;
  2944. memset(host, 0, sizeof(ENetHost));
  2945. host->peers = (ENetPeer*)enet_malloc(peerCount * sizeof(ENetPeer));
  2946. if (host->peers == NULL) {
  2947. enet_free(host);
  2948. return NULL;
  2949. }
  2950. memset(host->peers, 0, peerCount * sizeof(ENetPeer));
  2951. host->socket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
  2952. if (host->socket != ENET_SOCKET_NULL)
  2953. enet_socket_set_option(host->socket, ENET_SOCKOPT_IPV6_V6ONLY, 0);
  2954. if (host->socket == ENET_SOCKET_NULL || (address != NULL && enet_socket_bind(host->socket, address) < 0)) {
  2955. if (host->socket != ENET_SOCKET_NULL)
  2956. enet_socket_destroy(host->socket);
  2957. enet_free(host->peers);
  2958. enet_free(host);
  2959. return NULL;
  2960. }
  2961. if (bufferSize > ENET_HOST_BUFFER_SIZE_MAX)
  2962. bufferSize = ENET_HOST_BUFFER_SIZE_MAX;
  2963. else if (bufferSize < ENET_HOST_BUFFER_SIZE_MIN)
  2964. bufferSize = ENET_HOST_BUFFER_SIZE_MIN;
  2965. enet_socket_set_option(host->socket, ENET_SOCKOPT_NONBLOCK, 1);
  2966. enet_socket_set_option(host->socket, ENET_SOCKOPT_BROADCAST, 1);
  2967. enet_socket_set_option(host->socket, ENET_SOCKOPT_RCVBUF, bufferSize);
  2968. enet_socket_set_option(host->socket, ENET_SOCKOPT_SNDBUF, bufferSize);
  2969. if (address != NULL && enet_socket_get_address(host->socket, &host->address) < 0)
  2970. host->address = *address;
  2971. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  2972. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  2973. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  2974. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  2975. host->randomSeed = (enet_uint32)(size_t)host;
  2976. host->randomSeed += enet_host_random_seed();
  2977. host->randomSeed = (host->randomSeed << 16) | (host->randomSeed >> 16);
  2978. host->channelLimit = channelLimit;
  2979. host->incomingBandwidth = incomingBandwidth;
  2980. host->outgoingBandwidth = outgoingBandwidth;
  2981. host->bandwidthThrottleEpoch = 0;
  2982. host->recalculateBandwidthLimits = 0;
  2983. host->preventConnections = 0;
  2984. host->mtu = ENET_HOST_DEFAULT_MTU;
  2985. host->peerCount = peerCount;
  2986. host->commandCount = 0;
  2987. host->bufferCount = 0;
  2988. host->checksumCallback = NULL;
  2989. host->receivedAddress.ipv6 = ENET_HOST_ANY;
  2990. host->receivedAddress.port = 0;
  2991. host->receivedData = NULL;
  2992. host->receivedDataLength = 0;
  2993. host->totalSentData = 0;
  2994. host->totalSentPackets = 0;
  2995. host->totalReceivedData = 0;
  2996. host->totalReceivedPackets = 0;
  2997. host->connectedPeers = 0;
  2998. host->bandwidthLimitedPeers = 0;
  2999. host->duplicatePeers = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  3000. host->maximumPacketSize = ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE;
  3001. host->maximumWaitingData = ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA;
  3002. host->interceptCallback = NULL;
  3003. enet_list_clear(&host->dispatchQueue);
  3004. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3005. currentPeer->host = host;
  3006. currentPeer->incomingPeerID = currentPeer - host->peers;
  3007. currentPeer->outgoingSessionID = currentPeer->incomingSessionID = 0xFF;
  3008. currentPeer->data = NULL;
  3009. enet_list_clear(&currentPeer->acknowledgements);
  3010. enet_list_clear(&currentPeer->sentReliableCommands);
  3011. enet_list_clear(&currentPeer->sentUnreliableCommands);
  3012. enet_list_clear(&currentPeer->outgoingReliableCommands);
  3013. enet_list_clear(&currentPeer->outgoingUnreliableCommands);
  3014. enet_list_clear(&currentPeer->dispatchedCommands);
  3015. enet_peer_reset(currentPeer);
  3016. }
  3017. return host;
  3018. }
  3019. void enet_host_destroy(ENetHost* host) {
  3020. ENetPeer* currentPeer;
  3021. if (host == NULL)
  3022. return;
  3023. enet_socket_destroy(host->socket);
  3024. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3025. enet_peer_reset(currentPeer);
  3026. }
  3027. enet_free(host->peers);
  3028. enet_free(host);
  3029. }
  3030. void enet_host_prevent_connections(ENetHost* host, enet_uint8 state) {
  3031. if (host == NULL)
  3032. return;
  3033. host->preventConnections = state;
  3034. }
  3035. ENetPeer* enet_host_connect(ENetHost* host, const ENetAddress* address, size_t channelCount, enet_uint32 data) {
  3036. ENetPeer* currentPeer;
  3037. ENetChannel* channel;
  3038. ENetProtocol command;
  3039. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3040. channelCount = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3041. else if (channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3042. channelCount = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3043. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3044. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED)
  3045. break;
  3046. }
  3047. if (currentPeer >= &host->peers[host->peerCount])
  3048. return NULL;
  3049. currentPeer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  3050. if (currentPeer->channels == NULL)
  3051. return NULL;
  3052. currentPeer->channelCount = channelCount;
  3053. currentPeer->state = ENET_PEER_STATE_CONNECTING;
  3054. currentPeer->address = *address;
  3055. currentPeer->connectID = ++host->randomSeed;
  3056. if (host->outgoingBandwidth == 0)
  3057. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3058. else
  3059. currentPeer->windowSize = (host->outgoingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3060. if (currentPeer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  3061. currentPeer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3062. else if (currentPeer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  3063. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3064. for (channel = currentPeer->channels; channel < &currentPeer->channels[channelCount]; ++channel) {
  3065. channel->outgoingReliableSequenceNumber = 0;
  3066. channel->outgoingUnreliableSequenceNumber = 0;
  3067. channel->incomingReliableSequenceNumber = 0;
  3068. channel->incomingUnreliableSequenceNumber = 0;
  3069. enet_list_clear(&channel->incomingReliableCommands);
  3070. enet_list_clear(&channel->incomingUnreliableCommands);
  3071. channel->usedReliableWindows = 0;
  3072. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  3073. }
  3074. command.header.command = ENET_PROTOCOL_COMMAND_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3075. command.header.channelID = 0xFF;
  3076. command.connect.outgoingPeerID = ENET_HOST_TO_NET_16(currentPeer->incomingPeerID);
  3077. command.connect.incomingSessionID = currentPeer->incomingSessionID;
  3078. command.connect.outgoingSessionID = currentPeer->outgoingSessionID;
  3079. command.connect.mtu = ENET_HOST_TO_NET_32(currentPeer->mtu);
  3080. command.connect.windowSize = ENET_HOST_TO_NET_32(currentPeer->windowSize);
  3081. command.connect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  3082. command.connect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  3083. command.connect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3084. command.connect.packetThrottleInterval = ENET_HOST_TO_NET_32(currentPeer->packetThrottleInterval);
  3085. command.connect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleAcceleration);
  3086. command.connect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleDeceleration);
  3087. command.connect.connectID = currentPeer->connectID;
  3088. command.connect.data = ENET_HOST_TO_NET_32(data);
  3089. enet_peer_queue_outgoing_command(currentPeer, &command, NULL, 0, 0);
  3090. return currentPeer;
  3091. }
  3092. void enet_host_broadcast(ENetHost* host, enet_uint8 channelID, ENetPacket* packet) {
  3093. ENetPeer* currentPeer;
  3094. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3095. ++packet->referenceCount;
  3096. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3097. if (currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3098. continue;
  3099. enet_peer_send(currentPeer, channelID, packet);
  3100. }
  3101. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3102. --packet->referenceCount;
  3103. if (packet->referenceCount == 0)
  3104. enet_packet_destroy(packet);
  3105. }
  3106. void enet_host_broadcast_exclude(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer* excludedPeer) {
  3107. ENetPeer* currentPeer;
  3108. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3109. ++packet->referenceCount;
  3110. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3111. if (currentPeer->state != ENET_PEER_STATE_CONNECTED || currentPeer == excludedPeer)
  3112. continue;
  3113. enet_peer_send(currentPeer, channelID, packet);
  3114. }
  3115. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3116. --packet->referenceCount;
  3117. if (packet->referenceCount == 0)
  3118. enet_packet_destroy(packet);
  3119. }
  3120. void enet_host_broadcast_selective(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer** peers, size_t length) {
  3121. ENetPeer* currentPeer;
  3122. size_t i;
  3123. if (host == NULL)
  3124. return;
  3125. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3126. ++packet->referenceCount;
  3127. for (i = 0; i < length; i++) {
  3128. currentPeer = peers[i];
  3129. if (currentPeer == NULL || currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3130. continue;
  3131. enet_peer_send(currentPeer, channelID, packet);
  3132. }
  3133. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3134. --packet->referenceCount;
  3135. if (packet->referenceCount == 0)
  3136. enet_packet_destroy(packet);
  3137. }
  3138. void enet_host_channel_limit(ENetHost* host, size_t channelLimit) {
  3139. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3140. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3141. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3142. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3143. host->channelLimit = channelLimit;
  3144. }
  3145. void enet_host_bandwidth_limit(ENetHost* host, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth) {
  3146. host->incomingBandwidth = incomingBandwidth;
  3147. host->outgoingBandwidth = outgoingBandwidth;
  3148. host->recalculateBandwidthLimits = 1;
  3149. }
  3150. void enet_host_bandwidth_throttle(ENetHost* host) {
  3151. enet_uint32 timeCurrent = enet_time_get();
  3152. enet_uint32 elapsedTime = timeCurrent - host->bandwidthThrottleEpoch;
  3153. enet_uint32 peersRemaining = (enet_uint32)host->connectedPeers;
  3154. enet_uint32 dataTotal = ~0;
  3155. enet_uint32 bandwidth = ~0;
  3156. enet_uint32 throttle = 0;
  3157. enet_uint32 bandwidthLimit = 0;
  3158. int needsAdjustment = host->bandwidthLimitedPeers > 0 ? 1 : 0;
  3159. ENetPeer* peer;
  3160. ENetProtocol command;
  3161. if (elapsedTime < ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  3162. return;
  3163. if (host->outgoingBandwidth == 0 && host->incomingBandwidth == 0)
  3164. return;
  3165. host->bandwidthThrottleEpoch = timeCurrent;
  3166. if (peersRemaining == 0)
  3167. return;
  3168. if (host->outgoingBandwidth != 0) {
  3169. dataTotal = 0;
  3170. bandwidth = (host->outgoingBandwidth * elapsedTime) / 1000;
  3171. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3172. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3173. continue;
  3174. dataTotal += peer->outgoingDataTotal;
  3175. }
  3176. }
  3177. while (peersRemaining > 0 && needsAdjustment != 0) {
  3178. needsAdjustment = 0;
  3179. if (dataTotal <= bandwidth)
  3180. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3181. else
  3182. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3183. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3184. enet_uint32 peerBandwidth;
  3185. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidth == 0 || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3186. continue;
  3187. peerBandwidth = (peer->incomingBandwidth * elapsedTime) / 1000;
  3188. if ((throttle * peer->outgoingDataTotal) / ENET_PEER_PACKET_THROTTLE_SCALE <= peerBandwidth)
  3189. continue;
  3190. peer->packetThrottleLimit = (peerBandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / peer->outgoingDataTotal;
  3191. if (peer->packetThrottleLimit == 0)
  3192. peer->packetThrottleLimit = 1;
  3193. if (peer->packetThrottle > peer->packetThrottleLimit)
  3194. peer->packetThrottle = peer->packetThrottleLimit;
  3195. peer->outgoingBandwidthThrottleEpoch = timeCurrent;
  3196. peer->incomingDataTotal = 0;
  3197. peer->outgoingDataTotal = 0;
  3198. needsAdjustment = 1;
  3199. --peersRemaining;
  3200. bandwidth -= peerBandwidth;
  3201. dataTotal -= peerBandwidth;
  3202. }
  3203. }
  3204. if (peersRemaining > 0) {
  3205. if (dataTotal <= bandwidth)
  3206. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3207. else
  3208. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3209. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3210. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3211. continue;
  3212. peer->packetThrottleLimit = throttle;
  3213. if (peer->packetThrottle > peer->packetThrottleLimit)
  3214. peer->packetThrottle = peer->packetThrottleLimit;
  3215. peer->incomingDataTotal = 0;
  3216. peer->outgoingDataTotal = 0;
  3217. }
  3218. }
  3219. if (host->recalculateBandwidthLimits) {
  3220. host->recalculateBandwidthLimits = 0;
  3221. peersRemaining = (enet_uint32)host->connectedPeers;
  3222. bandwidth = host->incomingBandwidth;
  3223. needsAdjustment = 1;
  3224. if (bandwidth == 0) {
  3225. bandwidthLimit = 0;
  3226. } else {
  3227. while (peersRemaining > 0 && needsAdjustment != 0) {
  3228. needsAdjustment = 0;
  3229. bandwidthLimit = bandwidth / peersRemaining;
  3230. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3231. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3232. continue;
  3233. if (peer->outgoingBandwidth > 0 && peer->outgoingBandwidth >= bandwidthLimit)
  3234. continue;
  3235. peer->incomingBandwidthThrottleEpoch = timeCurrent;
  3236. needsAdjustment = 1;
  3237. --peersRemaining;
  3238. bandwidth -= peer->outgoingBandwidth;
  3239. }
  3240. }
  3241. }
  3242. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3243. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3244. continue;
  3245. command.header.command = ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3246. command.header.channelID = 0xFF;
  3247. command.bandwidthLimit.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3248. if (peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3249. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(peer->outgoingBandwidth);
  3250. else
  3251. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(bandwidthLimit);
  3252. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  3253. }
  3254. }
  3255. }
  3256. /*
  3257. =======================================================================
  3258. Address
  3259. =======================================================================
  3260. */
  3261. int enet_address_set_ip(ENetAddress* address, const char* ip) {
  3262. int type = AF_INET6;
  3263. void* destination = &address->ipv6;
  3264. if (strchr(ip, ':') == NULL) {
  3265. type = AF_INET;
  3266. memset(address, 0, sizeof(address->ipv4.zeros));
  3267. address->ipv4.ffff = 0xFFFF;
  3268. destination = &address->ipv4.ip;
  3269. }
  3270. if (!inet_pton(type, ip, destination))
  3271. return -1;
  3272. return 0;
  3273. }
  3274. int enet_address_set_hostname(ENetAddress* address, const char* name) {
  3275. struct addrinfo hints, *resultList = NULL, *result = NULL;
  3276. memset(&hints, 0, sizeof(hints));
  3277. hints.ai_family = AF_UNSPEC;
  3278. if (getaddrinfo(name, NULL, &hints, &resultList) != 0)
  3279. return -1;
  3280. for (result = resultList; result != NULL; result = result->ai_next) {
  3281. if (result->ai_addr != NULL && result->ai_addrlen >= sizeof(struct sockaddr_in)) {
  3282. if (result->ai_family == AF_INET) {
  3283. struct sockaddr_in* sin = (struct sockaddr_in*)result->ai_addr;
  3284. memset(address, 0, sizeof(address->ipv4.zeros));
  3285. address->ipv4.ffff = 0xFFFF;
  3286. address->ipv4.ip.s_addr = sin->sin_addr.s_addr;
  3287. freeaddrinfo(resultList);
  3288. return 0;
  3289. } else if (result->ai_family == AF_INET6) {
  3290. struct sockaddr_in6* sin = (struct sockaddr_in6*)result->ai_addr;
  3291. address->ipv6 = sin->sin6_addr;
  3292. freeaddrinfo(resultList);
  3293. return 0;
  3294. }
  3295. }
  3296. }
  3297. if (resultList != NULL)
  3298. freeaddrinfo(resultList);
  3299. return enet_address_set_ip(address, name);
  3300. }
  3301. int enet_address_get_ip(const ENetAddress* address, char* ip, size_t ipLength) {
  3302. if (inet_ntop(AF_INET6, &address->ipv6, ip, ipLength) == NULL)
  3303. return -1;
  3304. if (enet_array_is_zeroed(address->ipv4.zeros, sizeof(address->ipv4.zeros)) == 0 && address->ipv4.ffff == 0xFFFF)
  3305. enet_string_copy(ip, ip + 7, ipLength);
  3306. return 0;
  3307. }
  3308. int enet_address_get_hostname(const ENetAddress* address, char* name, size_t nameLength) {
  3309. struct sockaddr_in6 sin;
  3310. int err;
  3311. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3312. sin.sin6_family = AF_INET6;
  3313. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3314. sin.sin6_addr = address->ipv6;
  3315. err = getnameinfo((struct sockaddr*)&sin, sizeof(sin), name, nameLength, NULL, 0, NI_NAMEREQD);
  3316. if (!err) {
  3317. if (name != NULL && nameLength > 0 && !memchr(name, '\0', nameLength))
  3318. return -1;
  3319. return 0;
  3320. }
  3321. if (err != EAI_NONAME)
  3322. return -1;
  3323. return enet_address_get_ip(address, name, nameLength);
  3324. }
  3325. /*
  3326. =======================================================================
  3327. Platform-specific (Unix)
  3328. =======================================================================
  3329. */
  3330. #ifndef _WIN32
  3331. int enet_initialize(void) {
  3332. return 0;
  3333. }
  3334. void enet_deinitialize(void) { }
  3335. enet_uint64 enet_host_random_seed(void) {
  3336. struct timeval timeVal;
  3337. gettimeofday(&timeVal, NULL);
  3338. return (timeVal.tv_sec * 1000) ^ (timeVal.tv_usec / 1000);
  3339. }
  3340. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3341. struct sockaddr_in6 sin;
  3342. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3343. sin.sin6_family = AF_INET6;
  3344. if (address != NULL) {
  3345. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3346. sin.sin6_addr = address->ipv6;
  3347. } else {
  3348. sin.sin6_port = 0;
  3349. sin.sin6_addr = ENET_HOST_ANY;
  3350. }
  3351. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3352. }
  3353. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3354. struct sockaddr_storage ss;
  3355. socklen_t saLength = sizeof(ss);
  3356. if (getsockname(socket, (struct sockaddr*)&ss, &saLength) == -1)
  3357. return -1;
  3358. if (ss.ss_family == AF_INET) {
  3359. struct sockaddr_in* sin = (struct sockaddr_in*)&ss;
  3360. memset(address, 0, sizeof(address->ipv4.zeros));
  3361. address->ipv4.ffff = 0xFFFF;
  3362. address->ipv4.ip = sin->sin_addr;
  3363. address->port = ENET_NET_TO_HOST_16(sin->sin_port);
  3364. } else if (ss.ss_family == AF_INET6) {
  3365. struct sockaddr_in6* sin = (struct sockaddr_in6*)&ss;
  3366. address->ipv6 = sin->sin6_addr;
  3367. address->port = ENET_NET_TO_HOST_16(sin->sin6_port);
  3368. }
  3369. return 0;
  3370. }
  3371. int enet_socket_listen(ENetSocket socket, int backlog) {
  3372. return listen(socket, backlog < 0 ? SOMAXCONN : backlog);
  3373. }
  3374. ENetSocket enet_socket_create(ENetSocketType type) {
  3375. int socketType = (type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM);
  3376. #ifdef SOCK_CLOEXEC
  3377. socketType |= SOCK_CLOEXEC;
  3378. #endif
  3379. return socket(PF_INET6, socketType, 0);
  3380. }
  3381. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3382. int result = -1;
  3383. switch (option) {
  3384. case ENET_SOCKOPT_NONBLOCK:
  3385. result = fcntl(socket, F_SETFL, (value ? O_NONBLOCK : 0) | (fcntl(socket, F_GETFL) & ~O_NONBLOCK));
  3386. break;
  3387. case ENET_SOCKOPT_BROADCAST:
  3388. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3389. break;
  3390. case ENET_SOCKOPT_REUSEADDR:
  3391. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3392. break;
  3393. case ENET_SOCKOPT_RCVBUF:
  3394. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3395. break;
  3396. case ENET_SOCKOPT_SNDBUF:
  3397. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3398. break;
  3399. case ENET_SOCKOPT_RCVTIMEO: {
  3400. struct timeval timeVal;
  3401. timeVal.tv_sec = value / 1000;
  3402. timeVal.tv_usec = (value % 1000) * 1000;
  3403. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3404. break;
  3405. }
  3406. case ENET_SOCKOPT_SNDTIMEO: {
  3407. struct timeval timeVal;
  3408. timeVal.tv_sec = value / 1000;
  3409. timeVal.tv_usec = (value % 1000) * 1000;
  3410. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3411. break;
  3412. }
  3413. case ENET_SOCKOPT_NODELAY:
  3414. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3415. break;
  3416. case ENET_SOCKOPT_IPV6_V6ONLY:
  3417. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3418. break;
  3419. default:
  3420. break;
  3421. }
  3422. return result == -1 ? -1 : 0;
  3423. }
  3424. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3425. int result = -1;
  3426. socklen_t len;
  3427. switch (option) {
  3428. case ENET_SOCKOPT_ERROR:
  3429. len = sizeof(int);
  3430. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, value, &len);
  3431. break;
  3432. default:
  3433. break;
  3434. }
  3435. return result == -1 ? -1 : 0;
  3436. }
  3437. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3438. int result = -1;
  3439. struct sockaddr_in6 sin;
  3440. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3441. sin.sin6_family = AF_INET6;
  3442. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3443. sin.sin6_addr = address->ipv6;
  3444. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3445. if (result == -1 && errno == EINPROGRESS)
  3446. return 0;
  3447. return result;
  3448. }
  3449. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3450. int result = -1;
  3451. struct sockaddr_in6 sin;
  3452. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3453. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3454. if (result == -1)
  3455. return ENET_SOCKET_NULL;
  3456. if (address != NULL) {
  3457. address->ipv6 = sin.sin6_addr;
  3458. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3459. }
  3460. return result;
  3461. }
  3462. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3463. return shutdown(socket, (int)how);
  3464. }
  3465. void enet_socket_destroy(ENetSocket socket) {
  3466. if (socket != ENET_SOCKET_NULL)
  3467. close(socket);
  3468. }
  3469. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3470. struct msghdr msgHdr;
  3471. struct sockaddr_in6 sin;
  3472. int sentLength;
  3473. memset(&msgHdr, 0, sizeof(struct msghdr));
  3474. if (address != NULL) {
  3475. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3476. sin.sin6_family = AF_INET6;
  3477. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3478. sin.sin6_addr = address->ipv6;
  3479. msgHdr.msg_name = &sin;
  3480. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3481. }
  3482. msgHdr.msg_iov = (struct iovec*)buffers;
  3483. msgHdr.msg_iovlen = bufferCount;
  3484. sentLength = sendmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3485. if (sentLength == -1) {
  3486. if (errno == EWOULDBLOCK)
  3487. return 0;
  3488. return -1;
  3489. }
  3490. return sentLength;
  3491. }
  3492. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3493. struct msghdr msgHdr;
  3494. struct sockaddr_in6 sin;
  3495. int recvLength;
  3496. memset(&msgHdr, 0, sizeof(struct msghdr));
  3497. if (address != NULL) {
  3498. msgHdr.msg_name = &sin;
  3499. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3500. }
  3501. msgHdr.msg_iov = (struct iovec*)buffers;
  3502. msgHdr.msg_iovlen = bufferCount;
  3503. recvLength = recvmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3504. if (recvLength == -1) {
  3505. if (errno == EWOULDBLOCK)
  3506. return 0;
  3507. return -1;
  3508. }
  3509. if (msgHdr.msg_flags & MSG_TRUNC)
  3510. return -1;
  3511. if (address != NULL) {
  3512. address->ipv6 = sin.sin6_addr;
  3513. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3514. }
  3515. return recvLength;
  3516. }
  3517. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3518. struct timeval timeVal;
  3519. timeVal.tv_sec = timeout / 1000;
  3520. timeVal.tv_usec = (timeout % 1000) * 1000;
  3521. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3522. }
  3523. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3524. struct pollfd pollSocket;
  3525. int pollCount;
  3526. pollSocket.fd = socket;
  3527. pollSocket.events = 0;
  3528. if (*condition & ENET_SOCKET_WAIT_SEND)
  3529. pollSocket.events |= POLLOUT;
  3530. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3531. pollSocket.events |= POLLIN;
  3532. pollCount = poll(&pollSocket, 1, timeout);
  3533. if (pollCount < 0) {
  3534. if (errno == EINTR && *condition & ENET_SOCKET_WAIT_INTERRUPT) {
  3535. *condition = ENET_SOCKET_WAIT_INTERRUPT;
  3536. return 0;
  3537. }
  3538. return -1;
  3539. }
  3540. *condition = ENET_SOCKET_WAIT_NONE;
  3541. if (pollCount == 0)
  3542. return 0;
  3543. if (pollSocket.revents & POLLOUT)
  3544. *condition |= ENET_SOCKET_WAIT_SEND;
  3545. if (pollSocket.revents & POLLIN)
  3546. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3547. return 0;
  3548. }
  3549. #endif
  3550. /*
  3551. =======================================================================
  3552. Platform-specific (Windows)
  3553. =======================================================================
  3554. */
  3555. #ifdef _WIN32
  3556. int enet_initialize(void) {
  3557. WORD versionRequested = MAKEWORD(2, 2);
  3558. WSADATA wsaData;
  3559. if (WSAStartup(versionRequested, &wsaData))
  3560. return -1;
  3561. if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
  3562. WSACleanup();
  3563. return -1;
  3564. }
  3565. timeBeginPeriod(1);
  3566. return 0;
  3567. }
  3568. void enet_deinitialize(void) {
  3569. timeEndPeriod(1);
  3570. WSACleanup();
  3571. }
  3572. enet_uint64 enet_host_random_seed(void) {
  3573. return (enet_uint64)timeGetTime();
  3574. }
  3575. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3576. struct sockaddr_in6 sin;
  3577. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3578. sin.sin6_family = AF_INET6;
  3579. if (address != NULL) {
  3580. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3581. sin.sin6_addr = address->ipv6;
  3582. } else {
  3583. sin.sin6_port = 0;
  3584. sin.sin6_addr = in6addr_any;
  3585. }
  3586. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)) == SOCKET_ERROR ? -1 : 0;
  3587. }
  3588. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3589. struct sockaddr_storage ss;
  3590. int saLength = sizeof(ss);
  3591. if (getsockname(socket, (struct sockaddr*)&ss, &saLength) == -1)
  3592. return -1;
  3593. if (ss.ss_family == AF_INET) {
  3594. struct sockaddr_in* sin = (struct sockaddr_in*)&ss;
  3595. memset(address, 0, sizeof(address->ipv4.zeros));
  3596. address->ipv4.ffff = 0xFFFF;
  3597. address->ipv4.ip = sin->sin_addr;
  3598. address->port = ENET_NET_TO_HOST_16(sin->sin_port);
  3599. } else if (ss.ss_family == AF_INET6) {
  3600. struct sockaddr_in6* sin = (struct sockaddr_in6*)&ss;
  3601. address->ipv6 = sin->sin6_addr;
  3602. address->port = ENET_NET_TO_HOST_16(sin->sin6_port);
  3603. }
  3604. return 0;
  3605. }
  3606. int enet_socket_listen(ENetSocket socket, int backlog) {
  3607. return listen(socket, backlog < 0 ? SOMAXCONN : backlog) == SOCKET_ERROR ? -1 : 0;
  3608. }
  3609. ENetSocket enet_socket_create(ENetSocketType type) {
  3610. return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
  3611. }
  3612. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3613. int result = SOCKET_ERROR;
  3614. switch (option) {
  3615. case ENET_SOCKOPT_NONBLOCK: {
  3616. u_long nonBlocking = (u_long)value;
  3617. result = ioctlsocket(socket, FIONBIO, &nonBlocking);
  3618. break;
  3619. }
  3620. case ENET_SOCKOPT_BROADCAST:
  3621. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3622. break;
  3623. case ENET_SOCKOPT_REUSEADDR:
  3624. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3625. break;
  3626. case ENET_SOCKOPT_RCVBUF:
  3627. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3628. break;
  3629. case ENET_SOCKOPT_SNDBUF:
  3630. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3631. break;
  3632. case ENET_SOCKOPT_RCVTIMEO:
  3633. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&value, sizeof(int));
  3634. break;
  3635. case ENET_SOCKOPT_SNDTIMEO:
  3636. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&value, sizeof(int));
  3637. break;
  3638. case ENET_SOCKOPT_NODELAY:
  3639. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3640. break;
  3641. case ENET_SOCKOPT_IPV6_V6ONLY:
  3642. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3643. break;
  3644. default:
  3645. break;
  3646. }
  3647. return result == SOCKET_ERROR ? -1 : 0;
  3648. }
  3649. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3650. int result = SOCKET_ERROR, len;
  3651. switch (option) {
  3652. case ENET_SOCKOPT_ERROR:
  3653. len = sizeof(int);
  3654. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, (char*)value, &len);
  3655. break;
  3656. default:
  3657. break;
  3658. }
  3659. return result == SOCKET_ERROR ? -1 : 0;
  3660. }
  3661. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3662. int result = -1;
  3663. struct sockaddr_in6 sin;
  3664. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3665. sin.sin6_family = AF_INET6;
  3666. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3667. sin.sin6_addr = address->ipv6;
  3668. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3669. if (result == SOCKET_ERROR && WSAGetLastError() != WSAEWOULDBLOCK)
  3670. return -1;
  3671. return 0;
  3672. }
  3673. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3674. SOCKET result;
  3675. struct sockaddr_in6 sin;
  3676. int sinLength = sizeof(struct sockaddr_in6);
  3677. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3678. if (result == INVALID_SOCKET)
  3679. return ENET_SOCKET_NULL;
  3680. if (address != NULL) {
  3681. address->ipv6 = sin.sin6_addr;
  3682. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3683. }
  3684. return result;
  3685. }
  3686. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3687. return shutdown(socket, (int)how) == SOCKET_ERROR ? -1 : 0;
  3688. }
  3689. void enet_socket_destroy(ENetSocket socket) {
  3690. if (socket != INVALID_SOCKET)
  3691. closesocket(socket);
  3692. }
  3693. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3694. struct sockaddr_in6 sin;
  3695. DWORD sentLength;
  3696. if (address != NULL) {
  3697. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3698. sin.sin6_family = AF_INET6;
  3699. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3700. sin.sin6_addr = address->ipv6;
  3701. }
  3702. 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)
  3703. return (WSAGetLastError() == WSAEWOULDBLOCK) ? 0 : -1;
  3704. return (int)sentLength;
  3705. }
  3706. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3707. INT sinLength = sizeof(struct sockaddr_in6);
  3708. DWORD flags = 0, recvLength;
  3709. struct sockaddr_in6 sin;
  3710. if (WSARecvFrom(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &recvLength, &flags, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL, NULL, NULL) == SOCKET_ERROR) {
  3711. switch (WSAGetLastError()) {
  3712. case WSAEWOULDBLOCK:
  3713. case WSAECONNRESET:
  3714. return 0;
  3715. }
  3716. return -1;
  3717. }
  3718. if (flags & MSG_PARTIAL)
  3719. return -1;
  3720. if (address != NULL) {
  3721. address->ipv6 = sin.sin6_addr;
  3722. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3723. }
  3724. return (int)recvLength;
  3725. }
  3726. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3727. struct timeval timeVal;
  3728. timeVal.tv_sec = timeout / 1000;
  3729. timeVal.tv_usec = (timeout % 1000) * 1000;
  3730. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3731. }
  3732. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3733. fd_set readSet, writeSet;
  3734. struct timeval timeVal;
  3735. int selectCount;
  3736. timeVal.tv_sec = timeout / 1000;
  3737. timeVal.tv_usec = (timeout % 1000) * 1000;
  3738. FD_ZERO(&readSet);
  3739. FD_ZERO(&writeSet);
  3740. if (*condition & ENET_SOCKET_WAIT_SEND)
  3741. FD_SET(socket, &writeSet);
  3742. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3743. FD_SET(socket, &readSet);
  3744. selectCount = select(socket + 1, &readSet, &writeSet, NULL, &timeVal);
  3745. if (selectCount < 0)
  3746. return -1;
  3747. *condition = ENET_SOCKET_WAIT_NONE;
  3748. if (selectCount == 0)
  3749. return 0;
  3750. if (FD_ISSET(socket, &writeSet))
  3751. *condition |= ENET_SOCKET_WAIT_SEND;
  3752. if (FD_ISSET(socket, &readSet))
  3753. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3754. return 0;
  3755. }
  3756. #endif
  3757. /*
  3758. =======================================================================
  3759. Extended functionality
  3760. =======================================================================
  3761. */
  3762. void* enet_packet_get_data(const ENetPacket* packet) {
  3763. return (void*)packet->data;
  3764. }
  3765. void* enet_packet_get_user_data(const ENetPacket* packet) {
  3766. return packet->userData;
  3767. }
  3768. void enet_packet_set_user_data(ENetPacket* packet, void* userData) {
  3769. packet->userData = userData;
  3770. }
  3771. int enet_packet_get_length(const ENetPacket* packet) {
  3772. return packet->dataLength;
  3773. }
  3774. void enet_packet_set_free_callback(ENetPacket* packet, const void* callback) {
  3775. packet->freeCallback = (ENetPacketFreeCallback)callback;
  3776. }
  3777. int enet_packet_check_references(const ENetPacket* packet) {
  3778. return (int)packet->referenceCount;
  3779. }
  3780. void enet_packet_dispose(ENetPacket* packet) {
  3781. if (packet->referenceCount == 0)
  3782. enet_packet_destroy(packet);
  3783. }
  3784. enet_uint32 enet_host_get_peers_count(const ENetHost* host) {
  3785. return host->connectedPeers;
  3786. }
  3787. enet_uint32 enet_host_get_packets_sent(const ENetHost* host) {
  3788. return host->totalSentPackets;
  3789. }
  3790. enet_uint32 enet_host_get_packets_received(const ENetHost* host) {
  3791. return host->totalReceivedPackets;
  3792. }
  3793. enet_uint32 enet_host_get_bytes_sent(const ENetHost* host) {
  3794. return host->totalSentData;
  3795. }
  3796. enet_uint32 enet_host_get_bytes_received(const ENetHost* host) {
  3797. return host->totalReceivedData;
  3798. }
  3799. enet_uint32 enet_peer_get_id(const ENetPeer* peer) {
  3800. return peer->incomingPeerID;
  3801. }
  3802. int enet_peer_get_ip(const ENetPeer* peer, char* ip, size_t ipLength) {
  3803. return enet_address_get_ip(&peer->address, ip, ipLength);
  3804. }
  3805. enet_uint16 enet_peer_get_port(const ENetPeer* peer) {
  3806. return peer->address.port;
  3807. }
  3808. enet_uint32 enet_peer_get_mtu(const ENetPeer* peer) {
  3809. return peer->mtu;
  3810. }
  3811. ENetPeerState enet_peer_get_state(const ENetPeer* peer) {
  3812. return peer->state;
  3813. }
  3814. enet_uint32 enet_peer_get_rtt(const ENetPeer* peer) {
  3815. return peer->roundTripTime;
  3816. }
  3817. enet_uint32 enet_peer_get_lastsendtime(const ENetPeer* peer) {
  3818. return peer->lastSendTime;
  3819. }
  3820. enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer* peer) {
  3821. return peer->lastReceiveTime;
  3822. }
  3823. enet_uint64 enet_peer_get_packets_sent(const ENetPeer* peer) {
  3824. return peer->totalPacketsSent;
  3825. }
  3826. enet_uint64 enet_peer_get_packets_lost(const ENetPeer* peer) {
  3827. return peer->totalPacketsLost;
  3828. }
  3829. enet_uint64 enet_peer_get_bytes_sent(const ENetPeer* peer) {
  3830. return peer->totalDataSent;
  3831. }
  3832. enet_uint64 enet_peer_get_bytes_received(const ENetPeer* peer) {
  3833. return peer->totalDataReceived;
  3834. }
  3835. void* enet_peer_get_data(const ENetPeer* peer) {
  3836. return (void*)peer->data;
  3837. }
  3838. void enet_peer_set_data(ENetPeer* peer, const void* data) {
  3839. peer->data = (enet_uint32*)data;
  3840. }
  3841. #ifdef _MSC_VER
  3842. #pragma warning(pop)
  3843. #endif
  3844. #endif // ENET_IMPLEMENTATION
  3845. #endif // ENET_H