enet.h 175 KB

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  1. /*
  2. * ENet reliable UDP networking library
  3. * Copyright (c) 2018 Lee Salzman, Vladyslav Hrytsenko, Dominik Madarász, Stanislav Denisov
  4. *
  5. * Permission is hereby granted, free of charge, to any person obtaining a copy
  6. * of this software and associated documentation files (the "Software"), to deal
  7. * in the Software without restriction, including without limitation the rights
  8. * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  9. * copies of the Software, and to permit persons to whom the Software is
  10. * furnished to do so, subject to the following conditions:
  11. *
  12. * The above copyright notice and this permission notice shall be included in all
  13. * copies or substantial portions of the Software.
  14. *
  15. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18. * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21. * SOFTWARE.
  22. */
  23. #ifndef ENET_H
  24. #define ENET_H
  25. #include <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 5
  32. #define ENET_VERSION_CREATE(major, minor, patch) (((major) << 16) | ((minor) << 8) | (patch))
  33. #define ENET_VERSION_GET_MAJOR(version) (((version) >> 16) & 0xFF)
  34. #define ENET_VERSION_GET_MINOR(version) (((version) >> 8) & 0xFF)
  35. #define ENET_VERSION_GET_PATCH(version) ((version) & 0xFF)
  36. #define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH)
  37. #define ENET_TIME_OVERFLOW 86400000
  38. #define ENET_TIME_LESS(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW)
  39. #define ENET_TIME_GREATER(a, b) ((b) - (a) >= ENET_TIME_OVERFLOW)
  40. #define ENET_TIME_LESS_EQUAL(a, b) (!ENET_TIME_GREATER(a, b))
  41. #define ENET_TIME_GREATER_EQUAL(a, b) (!ENET_TIME_LESS(a, b))
  42. #define ENET_TIME_DIFFERENCE(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW ? (b) - (a) : (a) - (b))
  43. #define ENET_MAX(x, y) ((x) > (y) ? (x) : (y))
  44. #define ENET_MIN(x, y) ((x) < (y) ? (x) : (y))
  45. #define ENET_SRTT_INITIAL 1.0
  46. #define ENET_SRTT_PARA_G 0.125
  47. /*
  48. =======================================================================
  49. System differences
  50. =======================================================================
  51. */
  52. #ifdef _WIN32
  53. #ifndef ENET_NO_PRAGMA_LINK
  54. #pragma comment(lib, "ws2_32.lib")
  55. #pragma comment(lib, "winmm.lib")
  56. #endif
  57. #if _MSC_VER >= 1910
  58. /* It looks like there were changes as of Visual Studio 2017 and there are no 32/64 bit
  59. versions of _InterlockedExchange[operation], only InterlockedExchange[operation]
  60. (without leading underscore), so we have to distinguish between compiler versions */
  61. #define NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  62. #endif
  63. #ifdef __GNUC__
  64. #if (_WIN32_WINNT < 0x0501)
  65. #undef _WIN32_WINNT
  66. #define _WIN32_WINNT 0x0501
  67. #endif
  68. #endif
  69. #include <winsock2.h>
  70. #include <ws2tcpip.h>
  71. #include <mmsystem.h>
  72. #include <intrin.h>
  73. #if defined(_WIN32) && defined(_MSC_VER)
  74. #if _MSC_VER < 1900
  75. typedef struct timespec {
  76. long tv_sec;
  77. long tv_nsec;
  78. };
  79. #endif
  80. #define CLOCK_MONOTONIC 0
  81. #endif
  82. typedef SOCKET ENetSocket;
  83. #define ENET_SOCKET_NULL INVALID_SOCKET
  84. typedef struct {
  85. size_t dataLength;
  86. void* data;
  87. } ENetBuffer;
  88. #define ENET_CALLBACK __cdecl
  89. #ifdef ENET_DLL
  90. #ifdef ENET_IMPLEMENTATION
  91. #define ENET_API __declspec(dllexport)
  92. #else
  93. #define ENET_API __declspec(dllimport)
  94. #endif
  95. #else
  96. #define ENET_API extern
  97. #endif
  98. #else
  99. #include <sys/types.h>
  100. #include <sys/ioctl.h>
  101. #include <sys/time.h>
  102. #include <sys/socket.h>
  103. #include <poll.h>
  104. #include <arpa/inet.h>
  105. #include <netinet/in.h>
  106. #include <netinet/tcp.h>
  107. #include <netdb.h>
  108. #include <unistd.h>
  109. #include <string.h>
  110. #include <errno.h>
  111. #include <fcntl.h>
  112. #ifdef __APPLE__
  113. #include <mach/clock.h>
  114. #include <mach/mach.h>
  115. #include <Availability.h>
  116. #endif
  117. #ifndef MSG_NOSIGNAL
  118. #define MSG_NOSIGNAL 0
  119. #endif
  120. #ifdef MSG_MAXIOVLEN
  121. #define ENET_BUFFER_MAXIMUM MSG_MAXIOVLEN
  122. #endif
  123. typedef int ENetSocket;
  124. #define ENET_SOCKET_NULL -1
  125. typedef struct {
  126. void* data;
  127. size_t dataLength;
  128. } ENetBuffer;
  129. #define ENET_CALLBACK
  130. #define ENET_API extern
  131. #endif
  132. #ifndef ENET_BUFFER_MAXIMUM
  133. #define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS)
  134. #endif
  135. #define ENET_HOST_ANY in6addr_any
  136. #define ENET_PORT_ANY 0
  137. #define ENET_HOST_SIZE 1025
  138. #define ENET_HOST_TO_NET_16(value) (htons(value))
  139. #define ENET_HOST_TO_NET_32(value) (htonl(value))
  140. #define ENET_NET_TO_HOST_16(value) (ntohs(value))
  141. #define ENET_NET_TO_HOST_32(value) (ntohl(value))
  142. #ifdef __cplusplus
  143. extern "C" {
  144. #endif
  145. /*
  146. =======================================================================
  147. Internals
  148. =======================================================================
  149. */
  150. typedef uint8_t enet_uint8;
  151. typedef uint16_t enet_uint16;
  152. typedef uint32_t enet_uint32;
  153. typedef uint64_t enet_uint64;
  154. typedef enet_uint32 ENetVersion;
  155. typedef fd_set ENetSocketSet;
  156. typedef struct _ENetCallbacks {
  157. void* (ENET_CALLBACK *malloc)(size_t size);
  158. void (ENET_CALLBACK *free)(void* memory);
  159. void (ENET_CALLBACK *noMemory)(void);
  160. } ENetCallbacks;
  161. extern void* enet_malloc(size_t);
  162. extern void enet_free(void*);
  163. typedef struct _ENetListNode {
  164. struct _ENetListNode* next;
  165. struct _ENetListNode* previous;
  166. } ENetListNode;
  167. typedef ENetListNode* ENetListIterator;
  168. typedef struct _ENetList {
  169. ENetListNode sentinel;
  170. } ENetList;
  171. extern ENetListIterator enet_list_insert(ENetListIterator, void*);
  172. extern ENetListIterator enet_list_move(ENetListIterator, void*, void*);
  173. extern void* enet_list_remove(ENetListIterator);
  174. extern void enet_list_clear(ENetList*);
  175. extern size_t enet_list_size(ENetList*);
  176. #define enet_list_begin(list) ((list)->sentinel.next)
  177. #define enet_list_end(list) (&(list)->sentinel)
  178. #define enet_list_empty(list) (enet_list_begin(list) == enet_list_end(list))
  179. #define enet_list_next(iterator) ((iterator)->next)
  180. #define enet_list_previous(iterator) ((iterator)->previous)
  181. #define enet_list_front(list) ((void*)(list)->sentinel.next)
  182. #define enet_list_back(list) ((void*)(list)->sentinel.previous)
  183. #define enet_in6_equal(a, b) (memcmp(&a, &b, sizeof(struct in6_addr)) == 0)
  184. /*
  185. =======================================================================
  186. Protocol
  187. =======================================================================
  188. */
  189. enum {
  190. ENET_PROTOCOL_MINIMUM_MTU = 576,
  191. ENET_PROTOCOL_MAXIMUM_MTU = 4096,
  192. ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS = 32,
  193. ENET_PROTOCOL_MINIMUM_WINDOW_SIZE = 4096,
  194. ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE = 65536,
  195. ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT = 1,
  196. ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT = 255,
  197. ENET_PROTOCOL_MAXIMUM_PEER_ID = 0xFFF,
  198. ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT = 1024 * 1024
  199. };
  200. typedef enum _ENetProtocolCommand {
  201. ENET_PROTOCOL_COMMAND_NONE = 0,
  202. ENET_PROTOCOL_COMMAND_ACKNOWLEDGE = 1,
  203. ENET_PROTOCOL_COMMAND_CONNECT = 2,
  204. ENET_PROTOCOL_COMMAND_VERIFY_CONNECT = 3,
  205. ENET_PROTOCOL_COMMAND_DISCONNECT = 4,
  206. ENET_PROTOCOL_COMMAND_PING = 5,
  207. ENET_PROTOCOL_COMMAND_SEND_RELIABLE = 6,
  208. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE = 7,
  209. ENET_PROTOCOL_COMMAND_SEND_FRAGMENT = 8,
  210. ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED = 9,
  211. ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT = 10,
  212. ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE = 11,
  213. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT = 12,
  214. ENET_PROTOCOL_COMMAND_COUNT = 13,
  215. ENET_PROTOCOL_COMMAND_MASK = 0x0F
  216. } ENetProtocolCommand;
  217. typedef enum _ENetProtocolFlag {
  218. ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE = (1 << 7),
  219. ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED = (1 << 6),
  220. ENET_PROTOCOL_HEADER_FLAG_SENT_TIME = (1 << 14),
  221. ENET_PROTOCOL_HEADER_FLAG_COMPRESSED = (1 << 15),
  222. ENET_PROTOCOL_HEADER_FLAG_MASK = ENET_PROTOCOL_HEADER_FLAG_SENT_TIME | ENET_PROTOCOL_HEADER_FLAG_COMPRESSED,
  223. ENET_PROTOCOL_HEADER_SESSION_MASK = (3 << 12),
  224. ENET_PROTOCOL_HEADER_SESSION_SHIFT = 12
  225. } ENetProtocolFlag;
  226. #ifdef _MSC_VER
  227. #pragma pack(push, 1)
  228. #define ENET_PACKED
  229. #elif defined(__GNUC__) || defined(__clang__)
  230. #define ENET_PACKED __attribute__ ((packed))
  231. #else
  232. #define ENET_PACKED
  233. #endif
  234. typedef struct _ENetProtocolHeader {
  235. enet_uint16 peerID;
  236. enet_uint16 sentTime;
  237. } ENET_PACKED ENetProtocolHeader;
  238. typedef struct _ENetProtocolCommandHeader {
  239. enet_uint8 command;
  240. enet_uint8 channelID;
  241. enet_uint16 reliableSequenceNumber;
  242. } ENET_PACKED ENetProtocolCommandHeader;
  243. typedef struct _ENetProtocolAcknowledge {
  244. ENetProtocolCommandHeader header;
  245. enet_uint16 receivedReliableSequenceNumber;
  246. enet_uint16 receivedSentTime;
  247. } ENET_PACKED ENetProtocolAcknowledge;
  248. typedef struct _ENetProtocolConnect {
  249. ENetProtocolCommandHeader header;
  250. enet_uint16 outgoingPeerID;
  251. enet_uint8 incomingSessionID;
  252. enet_uint8 outgoingSessionID;
  253. enet_uint32 mtu;
  254. enet_uint32 windowSize;
  255. enet_uint32 channelCount;
  256. enet_uint32 incomingBandwidth;
  257. enet_uint32 outgoingBandwidth;
  258. enet_uint32 packetThrottleInterval;
  259. enet_uint32 packetThrottleAcceleration;
  260. enet_uint32 packetThrottleDeceleration;
  261. enet_uint32 connectID;
  262. enet_uint32 data;
  263. } ENET_PACKED ENetProtocolConnect;
  264. typedef struct _ENetProtocolVerifyConnect {
  265. ENetProtocolCommandHeader header;
  266. enet_uint16 outgoingPeerID;
  267. enet_uint8 incomingSessionID;
  268. enet_uint8 outgoingSessionID;
  269. enet_uint32 mtu;
  270. enet_uint32 windowSize;
  271. enet_uint32 channelCount;
  272. enet_uint32 incomingBandwidth;
  273. enet_uint32 outgoingBandwidth;
  274. enet_uint32 packetThrottleInterval;
  275. enet_uint32 packetThrottleAcceleration;
  276. enet_uint32 packetThrottleDeceleration;
  277. enet_uint32 connectID;
  278. } ENET_PACKED ENetProtocolVerifyConnect;
  279. typedef struct _ENetProtocolBandwidthLimit {
  280. ENetProtocolCommandHeader header;
  281. enet_uint32 incomingBandwidth;
  282. enet_uint32 outgoingBandwidth;
  283. } ENET_PACKED ENetProtocolBandwidthLimit;
  284. typedef struct _ENetProtocolThrottleConfigure {
  285. ENetProtocolCommandHeader header;
  286. enet_uint32 packetThrottleInterval;
  287. enet_uint32 packetThrottleAcceleration;
  288. enet_uint32 packetThrottleDeceleration;
  289. } ENET_PACKED ENetProtocolThrottleConfigure;
  290. typedef struct _ENetProtocolDisconnect {
  291. ENetProtocolCommandHeader header;
  292. enet_uint32 data;
  293. } ENET_PACKED ENetProtocolDisconnect;
  294. typedef struct _ENetProtocolPing {
  295. ENetProtocolCommandHeader header;
  296. } ENET_PACKED ENetProtocolPing;
  297. typedef struct _ENetProtocolSendReliable {
  298. ENetProtocolCommandHeader header;
  299. enet_uint16 dataLength;
  300. } ENET_PACKED ENetProtocolSendReliable;
  301. typedef struct _ENetProtocolSendUnreliable {
  302. ENetProtocolCommandHeader header;
  303. enet_uint16 unreliableSequenceNumber;
  304. enet_uint16 dataLength;
  305. } ENET_PACKED ENetProtocolSendUnreliable;
  306. typedef struct _ENetProtocolSendUnsequenced {
  307. ENetProtocolCommandHeader header;
  308. enet_uint16 unsequencedGroup;
  309. enet_uint16 dataLength;
  310. } ENET_PACKED ENetProtocolSendUnsequenced;
  311. typedef struct _ENetProtocolSendFragment {
  312. ENetProtocolCommandHeader header;
  313. enet_uint16 startSequenceNumber;
  314. enet_uint16 dataLength;
  315. enet_uint32 fragmentCount;
  316. enet_uint32 fragmentNumber;
  317. enet_uint32 totalLength;
  318. enet_uint32 fragmentOffset;
  319. } ENET_PACKED ENetProtocolSendFragment;
  320. typedef union _ENetProtocol {
  321. ENetProtocolCommandHeader header;
  322. ENetProtocolAcknowledge acknowledge;
  323. ENetProtocolConnect connect;
  324. ENetProtocolVerifyConnect verifyConnect;
  325. ENetProtocolDisconnect disconnect;
  326. ENetProtocolPing ping;
  327. ENetProtocolSendReliable sendReliable;
  328. ENetProtocolSendUnreliable sendUnreliable;
  329. ENetProtocolSendUnsequenced sendUnsequenced;
  330. ENetProtocolSendFragment sendFragment;
  331. ENetProtocolBandwidthLimit bandwidthLimit;
  332. ENetProtocolThrottleConfigure throttleConfigure;
  333. } ENET_PACKED ENetProtocol;
  334. #ifdef _MSC_VER
  335. #pragma pack(pop)
  336. #endif
  337. /*
  338. =======================================================================
  339. General structs/enums
  340. =======================================================================
  341. */
  342. typedef enum _ENetSocketType {
  343. ENET_SOCKET_TYPE_STREAM = 1,
  344. ENET_SOCKET_TYPE_DATAGRAM = 2
  345. } ENetSocketType;
  346. typedef enum _ENetSocketWait {
  347. ENET_SOCKET_WAIT_NONE = 0,
  348. ENET_SOCKET_WAIT_SEND = (1 << 0),
  349. ENET_SOCKET_WAIT_RECEIVE = (1 << 1),
  350. ENET_SOCKET_WAIT_INTERRUPT = (1 << 2)
  351. } ENetSocketWait;
  352. typedef enum _ENetSocketOption {
  353. ENET_SOCKOPT_NONBLOCK = 1,
  354. ENET_SOCKOPT_BROADCAST = 2,
  355. ENET_SOCKOPT_RCVBUF = 3,
  356. ENET_SOCKOPT_SNDBUF = 4,
  357. ENET_SOCKOPT_REUSEADDR = 5,
  358. ENET_SOCKOPT_RCVTIMEO = 6,
  359. ENET_SOCKOPT_SNDTIMEO = 7,
  360. ENET_SOCKOPT_ERROR = 8,
  361. ENET_SOCKOPT_NODELAY = 9,
  362. ENET_SOCKOPT_IPV6_V6ONLY = 10
  363. } ENetSocketOption;
  364. typedef enum _ENetSocketShutdown {
  365. ENET_SOCKET_SHUTDOWN_READ = 0,
  366. ENET_SOCKET_SHUTDOWN_WRITE = 1,
  367. ENET_SOCKET_SHUTDOWN_READ_WRITE = 2
  368. } ENetSocketShutdown;
  369. typedef struct _ENetAddress {
  370. union {
  371. struct in6_addr ipv6;
  372. struct {
  373. uint8_t zeros[10];
  374. uint16_t ffff;
  375. struct in_addr ip;
  376. } ipv4;
  377. };
  378. uint16_t port;
  379. } ENetAddress;
  380. typedef enum _ENetPacketFlag {
  381. ENET_PACKET_FLAG_NONE = 0,
  382. ENET_PACKET_FLAG_RELIABLE = (1 << 0),
  383. ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1),
  384. ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2),
  385. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED = (1 << 3),
  386. ENET_PACKET_FLAG_INSTANT = (1 << 4),
  387. ENET_PACKET_FLAG_SENT = (1 << 8)
  388. } ENetPacketFlag;
  389. typedef void (ENET_CALLBACK *ENetPacketFreeCallback)(void*);
  390. typedef struct _ENetPacket {
  391. enet_uint32 flags;
  392. enet_uint32 dataLength;
  393. enet_uint8* data;
  394. ENetPacketFreeCallback freeCallback;
  395. enet_uint32 referenceCount;
  396. } ENetPacket;
  397. typedef struct _ENetAcknowledgement {
  398. ENetListNode acknowledgementList;
  399. enet_uint32 sentTime;
  400. ENetProtocol command;
  401. } ENetAcknowledgement;
  402. typedef struct _ENetOutgoingCommand {
  403. ENetListNode outgoingCommandList;
  404. enet_uint16 reliableSequenceNumber;
  405. enet_uint16 unreliableSequenceNumber;
  406. enet_uint32 sentTime;
  407. enet_uint32 roundTripTimeout;
  408. enet_uint32 roundTripTimeoutLimit;
  409. enet_uint32 fragmentOffset;
  410. enet_uint16 fragmentLength;
  411. enet_uint16 sendAttempts;
  412. ENetProtocol command;
  413. ENetPacket* packet;
  414. } ENetOutgoingCommand;
  415. typedef struct _ENetIncomingCommand {
  416. ENetListNode incomingCommandList;
  417. enet_uint16 reliableSequenceNumber;
  418. enet_uint16 unreliableSequenceNumber;
  419. ENetProtocol command;
  420. enet_uint32 fragmentCount;
  421. enet_uint32 fragmentsRemaining;
  422. enet_uint32* fragments;
  423. ENetPacket* packet;
  424. } ENetIncomingCommand;
  425. typedef enum _ENetPeerState {
  426. ENET_PEER_STATE_DISCONNECTED = 0,
  427. ENET_PEER_STATE_CONNECTING = 1,
  428. ENET_PEER_STATE_ACKNOWLEDGING_CONNECT = 2,
  429. ENET_PEER_STATE_CONNECTION_PENDING = 3,
  430. ENET_PEER_STATE_CONNECTION_SUCCEEDED = 4,
  431. ENET_PEER_STATE_CONNECTED = 5,
  432. ENET_PEER_STATE_DISCONNECT_LATER = 6,
  433. ENET_PEER_STATE_DISCONNECTING = 7,
  434. ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT = 8,
  435. ENET_PEER_STATE_ZOMBIE = 9
  436. } ENetPeerState;
  437. enum {
  438. ENET_HOST_BUFFER_SIZE_MIN = 256 * 1024,
  439. ENET_HOST_BUFFER_SIZE_MAX = 1024 * 1024,
  440. ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000,
  441. ENET_HOST_DEFAULT_MTU = 1280,
  442. ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024,
  443. ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
  444. ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 500,
  445. ENET_PEER_DEFAULT_PACKET_THROTTLE = 32,
  446. ENET_PEER_PACKET_THROTTLE_THRESHOLD = 20,
  447. ENET_PEER_PACKET_THROTTLE_SCALE = 32,
  448. ENET_PEER_PACKET_THROTTLE_COUNTER = 7,
  449. ENET_PEER_PACKET_THROTTLE_ACCELERATION = 2,
  450. ENET_PEER_PACKET_THROTTLE_DECELERATION = 2,
  451. ENET_PEER_PACKET_THROTTLE_INTERVAL = 5000,
  452. ENET_PEER_PACKET_LOSS_SCALE = (1 << 16),
  453. ENET_PEER_PACKET_LOSS_INTERVAL = 10000,
  454. ENET_PEER_WINDOW_SIZE_SCALE = 64 * 1024,
  455. ENET_PEER_TIMEOUT_LIMIT = 32,
  456. ENET_PEER_TIMEOUT_MINIMUM = 5000,
  457. ENET_PEER_TIMEOUT_MAXIMUM = 30000,
  458. ENET_PEER_PING_INTERVAL = 500,
  459. ENET_PEER_UNSEQUENCED_WINDOWS = 64,
  460. ENET_PEER_UNSEQUENCED_WINDOW_SIZE = 1024,
  461. ENET_PEER_FREE_UNSEQUENCED_WINDOWS = 32,
  462. ENET_PEER_RELIABLE_WINDOWS = 16,
  463. ENET_PEER_RELIABLE_WINDOW_SIZE = 0x1000,
  464. ENET_PEER_FREE_RELIABLE_WINDOWS = 8
  465. };
  466. typedef struct _ENetChannel {
  467. enet_uint16 outgoingReliableSequenceNumber;
  468. enet_uint16 outgoingUnreliableSequenceNumber;
  469. enet_uint16 usedReliableWindows;
  470. enet_uint16 reliableWindows[ENET_PEER_RELIABLE_WINDOWS];
  471. enet_uint16 incomingReliableSequenceNumber;
  472. enet_uint16 incomingUnreliableSequenceNumber;
  473. ENetList incomingReliableCommands;
  474. ENetList incomingUnreliableCommands;
  475. } ENetChannel;
  476. typedef struct _ENetPeer {
  477. ENetListNode dispatchList;
  478. struct _ENetHost* host;
  479. enet_uint16 outgoingPeerID;
  480. enet_uint16 incomingPeerID;
  481. enet_uint32 connectID;
  482. enet_uint8 outgoingSessionID;
  483. enet_uint8 incomingSessionID;
  484. ENetAddress address;
  485. void* data;
  486. ENetPeerState state;
  487. ENetChannel* channels;
  488. size_t channelCount;
  489. enet_uint32 incomingBandwidth;
  490. enet_uint32 outgoingBandwidth;
  491. enet_uint32 incomingBandwidthThrottleEpoch;
  492. enet_uint32 outgoingBandwidthThrottleEpoch;
  493. enet_uint32 incomingDataTotal;
  494. enet_uint64 totalDataReceived;
  495. enet_uint32 outgoingDataTotal;
  496. enet_uint64 totalDataSent;
  497. enet_uint32 lastSendTime;
  498. enet_uint32 lastReceiveTime;
  499. enet_uint32 nextTimeout;
  500. enet_uint32 earliestTimeout;
  501. enet_uint32 packetLossEpoch;
  502. enet_uint32 packetsSent;
  503. enet_uint64 totalPacketsSent;
  504. enet_uint32 packetsLost;
  505. enet_uint64 totalPacketsLost;
  506. enet_uint32 packetLoss;
  507. enet_uint32 packetLossVariance;
  508. enet_uint32 packetThrottle;
  509. enet_uint32 packetThrottleThreshold;
  510. enet_uint32 packetThrottleLimit;
  511. enet_uint32 packetThrottleCounter;
  512. enet_uint32 packetThrottleEpoch;
  513. enet_uint32 packetThrottleAcceleration;
  514. enet_uint32 packetThrottleDeceleration;
  515. enet_uint32 packetThrottleInterval;
  516. enet_uint32 pingInterval;
  517. enet_uint32 timeoutLimit;
  518. enet_uint32 timeoutMinimum;
  519. enet_uint32 timeoutMaximum;
  520. enet_uint32 smoothedRoundTripTime;
  521. enet_uint32 lastRoundTripTime;
  522. enet_uint32 lowestRoundTripTime;
  523. enet_uint32 lastRoundTripTimeVariance;
  524. enet_uint32 highestRoundTripTimeVariance;
  525. enet_uint32 roundTripTime;
  526. enet_uint32 roundTripTimeVariance;
  527. enet_uint32 mtu;
  528. enet_uint32 windowSize;
  529. enet_uint32 reliableDataInTransit;
  530. enet_uint16 outgoingReliableSequenceNumber;
  531. ENetList acknowledgements;
  532. ENetList sentReliableCommands;
  533. ENetList sentUnreliableCommands;
  534. ENetList outgoingReliableCommands;
  535. ENetList outgoingUnreliableCommands;
  536. ENetList dispatchedCommands;
  537. int needsDispatch;
  538. enet_uint16 incomingUnsequencedGroup;
  539. enet_uint16 outgoingUnsequencedGroup;
  540. enet_uint32 unsequencedWindow[ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32];
  541. enet_uint32 eventData;
  542. size_t totalWaitingData;
  543. } ENetPeer;
  544. typedef enet_uint32 (ENET_CALLBACK *ENetChecksumCallback)(const ENetBuffer* buffers, size_t bufferCount);
  545. typedef int (ENET_CALLBACK *ENetInterceptCallback)(struct _ENetHost* host, void* event);
  546. typedef struct _ENetHost {
  547. ENetSocket socket;
  548. ENetAddress address;
  549. enet_uint32 incomingBandwidth;
  550. enet_uint32 outgoingBandwidth;
  551. enet_uint32 bandwidthThrottleEpoch;
  552. enet_uint32 mtu;
  553. enet_uint32 randomSeed;
  554. int recalculateBandwidthLimits;
  555. enet_uint8 preventConnections;
  556. ENetPeer* peers;
  557. size_t peerCount;
  558. size_t channelLimit;
  559. enet_uint32 serviceTime;
  560. ENetList dispatchQueue;
  561. int continueSending;
  562. size_t packetSize;
  563. enet_uint16 headerFlags;
  564. enet_uint32 totalSentData;
  565. enet_uint32 totalSentPackets;
  566. enet_uint32 totalReceivedData;
  567. enet_uint32 totalReceivedPackets;
  568. ENetProtocol commands[ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
  569. size_t commandCount;
  570. ENetBuffer buffers[ENET_BUFFER_MAXIMUM];
  571. size_t bufferCount;
  572. enet_uint8 compression;
  573. char* compressionBuffer;
  574. size_t compressionBufferSize;
  575. ENetChecksumCallback checksumCallback;
  576. enet_uint8 packetData[2][ENET_PROTOCOL_MAXIMUM_MTU];
  577. ENetAddress receivedAddress;
  578. enet_uint8* receivedData;
  579. size_t receivedDataLength;
  580. ENetInterceptCallback interceptCallback;
  581. size_t connectedPeers;
  582. size_t bandwidthLimitedPeers;
  583. size_t duplicatePeers;
  584. size_t maximumPacketSize;
  585. size_t maximumWaitingData;
  586. } ENetHost;
  587. typedef enum _ENetEventType {
  588. ENET_EVENT_TYPE_NONE = 0,
  589. ENET_EVENT_TYPE_CONNECT = 1,
  590. ENET_EVENT_TYPE_DISCONNECT = 2,
  591. ENET_EVENT_TYPE_RECEIVE = 3,
  592. ENET_EVENT_TYPE_DISCONNECT_TIMEOUT = 4
  593. } ENetEventType;
  594. typedef struct _ENetEvent {
  595. ENetEventType type;
  596. ENetPeer* peer;
  597. enet_uint8 channelID;
  598. enet_uint32 data;
  599. ENetPacket* packet;
  600. } ENetEvent;
  601. /*
  602. =======================================================================
  603. Public API
  604. =======================================================================
  605. */
  606. ENET_API int enet_initialize(void);
  607. ENET_API int enet_initialize_with_callbacks(ENetVersion, const ENetCallbacks*);
  608. ENET_API void enet_deinitialize(void);
  609. ENET_API ENetVersion enet_linked_version(void);
  610. ENET_API int enet_array_is_zeroed(const uint8_t*, int);
  611. ENET_API size_t enet_string_copy(char*, const char*, size_t);
  612. ENET_API enet_uint32 enet_time_get(void);
  613. ENET_API enet_uint32 enet_crc32(const ENetBuffer*, size_t);
  614. ENET_API ENetPacket* enet_packet_create(const void*, size_t, enet_uint32);
  615. ENET_API ENetPacket* enet_packet_create_offset(const void*, size_t, size_t, enet_uint32);
  616. ENET_API void enet_packet_destroy(ENetPacket*);
  617. ENET_API int enet_peer_send(ENetPeer*, enet_uint8, ENetPacket*);
  618. ENET_API ENetPacket* enet_peer_receive(ENetPeer*, enet_uint8*);
  619. ENET_API void enet_peer_ping(ENetPeer*);
  620. ENET_API void enet_peer_ping_interval(ENetPeer*, enet_uint32);
  621. ENET_API void enet_peer_timeout(ENetPeer*, enet_uint32, enet_uint32, enet_uint32);
  622. ENET_API void enet_peer_reset(ENetPeer*);
  623. ENET_API void enet_peer_disconnect(ENetPeer*, enet_uint32);
  624. ENET_API void enet_peer_disconnect_now(ENetPeer*, enet_uint32);
  625. ENET_API void enet_peer_disconnect_later(ENetPeer*, enet_uint32);
  626. ENET_API void enet_peer_throttle_configure(ENetPeer*, enet_uint32, enet_uint32, enet_uint32, enet_uint32);
  627. ENET_API ENetHost* enet_host_create(const ENetAddress*, size_t, size_t, enet_uint32, enet_uint32, int);
  628. ENET_API void enet_host_destroy(ENetHost*);
  629. ENET_API void enet_host_enable_compression(ENetHost*);
  630. ENET_API void enet_host_prevent_connections(ENetHost*, enet_uint8);
  631. ENET_API ENetPeer* enet_host_connect(ENetHost*, const ENetAddress*, size_t, enet_uint32);
  632. ENET_API int enet_host_check_events(ENetHost*, ENetEvent*);
  633. ENET_API int enet_host_service(ENetHost*, ENetEvent*, enet_uint32);
  634. ENET_API void enet_host_flush(ENetHost*);
  635. ENET_API void enet_host_broadcast(ENetHost*, enet_uint8, ENetPacket*);
  636. ENET_API void enet_host_broadcast_exclude(ENetHost*, enet_uint8, ENetPacket*, ENetPeer*);
  637. ENET_API void enet_host_broadcast_selective(ENetHost*, enet_uint8, ENetPacket*, ENetPeer**, size_t);
  638. ENET_API void enet_host_channel_limit(ENetHost*, size_t);
  639. ENET_API void enet_host_bandwidth_limit(ENetHost*, enet_uint32, enet_uint32);
  640. ENET_API int enet_address_set_ip(ENetAddress*, const char*);
  641. ENET_API int enet_address_set_hostname(ENetAddress*, const char*);
  642. ENET_API int enet_address_get_ip(const ENetAddress*, char*, size_t);
  643. ENET_API int enet_address_get_hostname(const ENetAddress*, char*, size_t);
  644. ENET_API ENetSocket enet_socket_create(ENetSocketType);
  645. ENET_API int enet_socket_bind(ENetSocket, const ENetAddress*);
  646. ENET_API int enet_socket_get_address(ENetSocket, ENetAddress*);
  647. ENET_API int enet_socket_listen(ENetSocket, int);
  648. ENET_API ENetSocket enet_socket_accept(ENetSocket, ENetAddress*);
  649. ENET_API int enet_socket_connect(ENetSocket, const ENetAddress*);
  650. ENET_API int enet_socket_send(ENetSocket, const ENetAddress*, const ENetBuffer*, size_t);
  651. ENET_API int enet_socket_receive(ENetSocket, ENetAddress*, ENetBuffer*, size_t);
  652. ENET_API int enet_socket_wait(ENetSocket, enet_uint32*, enet_uint64);
  653. ENET_API int enet_socket_set_option(ENetSocket, ENetSocketOption, int);
  654. ENET_API int enet_socket_get_option(ENetSocket, ENetSocketOption, int*);
  655. ENET_API int enet_socket_shutdown(ENetSocket, ENetSocketShutdown);
  656. ENET_API void enet_socket_destroy(ENetSocket);
  657. ENET_API int enet_socket_set_select(ENetSocket, ENetSocketSet*, ENetSocketSet*, enet_uint32);
  658. /* Extended API for easier binding in other programming languages */
  659. ENET_API void* enet_packet_get_data(const ENetPacket*);
  660. ENET_API int enet_packet_get_length(const ENetPacket*);
  661. ENET_API void enet_packet_set_free_callback(ENetPacket*, const void*);
  662. ENET_API int enet_packet_check_references(const ENetPacket*);
  663. ENET_API void enet_packet_dispose(ENetPacket*);
  664. ENET_API enet_uint32 enet_host_get_peers_count(const ENetHost*);
  665. ENET_API enet_uint32 enet_host_get_packets_sent(const ENetHost*);
  666. ENET_API enet_uint32 enet_host_get_packets_received(const ENetHost*);
  667. ENET_API enet_uint32 enet_host_get_bytes_sent(const ENetHost*);
  668. ENET_API enet_uint32 enet_host_get_bytes_received(const ENetHost*);
  669. ENET_API enet_uint32 enet_peer_get_id(const ENetPeer*);
  670. ENET_API int enet_peer_get_ip(const ENetPeer*, char*, size_t);
  671. ENET_API enet_uint16 enet_peer_get_port(const ENetPeer*);
  672. ENET_API enet_uint32 enet_peer_get_mtu(const ENetPeer*);
  673. ENET_API ENetPeerState enet_peer_get_state(const ENetPeer*);
  674. ENET_API enet_uint32 enet_peer_get_rtt(const ENetPeer*);
  675. ENET_API enet_uint32 enet_peer_get_lastsendtime(const ENetPeer*);
  676. ENET_API enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer*);
  677. ENET_API enet_uint64 enet_peer_get_packets_sent(const ENetPeer*);
  678. ENET_API enet_uint64 enet_peer_get_packets_lost(const ENetPeer*);
  679. ENET_API enet_uint64 enet_peer_get_bytes_sent(const ENetPeer*);
  680. ENET_API enet_uint64 enet_peer_get_bytes_received(const ENetPeer*);
  681. ENET_API void* enet_peer_get_data(const ENetPeer*);
  682. ENET_API void enet_peer_set_data(ENetPeer*, const void*);
  683. /*
  684. =======================================================================
  685. Private API
  686. =======================================================================
  687. */
  688. extern void enet_host_bandwidth_throttle(ENetHost*);
  689. extern enet_uint64 enet_host_random_seed(void);
  690. extern int enet_peer_throttle(ENetPeer*, enet_uint32);
  691. extern void enet_peer_reset_queues(ENetPeer*);
  692. extern void enet_peer_setup_outgoing_command(ENetPeer*, ENetOutgoingCommand*);
  693. extern ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer*, const ENetProtocol*, ENetPacket*, enet_uint32, enet_uint16);
  694. extern ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer*, const ENetProtocol*, const void*, size_t, enet_uint32, enet_uint32);
  695. extern ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer*, const ENetProtocol*, enet_uint16);
  696. extern void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer*, ENetChannel*);
  697. extern void enet_peer_dispatch_incoming_reliable_commands(ENetPeer*, ENetChannel*);
  698. extern void enet_peer_on_connect(ENetPeer*);
  699. extern void enet_peer_on_disconnect(ENetPeer*);
  700. extern size_t enet_protocol_command_size(enet_uint8);
  701. #ifdef __cplusplus
  702. }
  703. #endif
  704. #if defined(ENET_IMPLEMENTATION) && !defined(ENET_IMPLEMENTATION_DONE)
  705. #define ENET_IMPLEMENTATION_DONE 1
  706. #ifdef ENET_LZ4
  707. #include "lz4/lz4.h"
  708. #endif
  709. #ifdef __MINGW32__
  710. #include "mingw/inet_ntop.c"
  711. #include "mingw/inet_pton.c"
  712. #endif
  713. #ifdef _MSC_VER
  714. #pragma warning(push)
  715. #pragma warning(disable: 4244) /* 64-bit to 32-bit integer conversion */
  716. #pragma warning(disable: 4267) /* size_t to integer conversion */
  717. #endif
  718. /*
  719. =======================================================================
  720. Atomics
  721. =======================================================================
  722. */
  723. #ifdef _MSC_VER
  724. #define ENET_AT_CASSERT_PRED(predicate) sizeof(char[2 * !!(predicate) - 1])
  725. #define ENET_IS_SUPPORTED_ATOMIC(size) ENET_AT_CASSERT_PRED(size == 1 || size == 2 || size == 4 || size == 8)
  726. #define ENET_ATOMIC_SIZEOF(variable) (ENET_IS_SUPPORTED_ATOMIC(sizeof(*(variable))), sizeof(*(variable)))
  727. __inline int64_t enet_at_atomic_read(char* ptr, size_t size) {
  728. switch (size) {
  729. case 1:
  730. return _InterlockedExchangeAdd8((volatile char*)ptr, 0);
  731. case 2:
  732. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, 0);
  733. case 4:
  734. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  735. return InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  736. #else
  737. return _InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  738. #endif
  739. case 8:
  740. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  741. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  742. #else
  743. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  744. #endif
  745. default:
  746. return 0x0;
  747. }
  748. }
  749. __inline int64_t enet_at_atomic_write(char* ptr, int64_t value, size_t size) {
  750. switch (size) {
  751. case 1:
  752. return _InterlockedExchange8((volatile char*)ptr, (char)value);
  753. case 2:
  754. return _InterlockedExchange16((volatile SHORT*)ptr, (SHORT)value);
  755. case 4:
  756. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  757. return InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  758. #else
  759. return _InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  760. #endif
  761. case 8:
  762. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  763. return InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  764. #else
  765. return _InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  766. #endif
  767. default:
  768. return 0x0;
  769. }
  770. }
  771. __inline int64_t enet_at_atomic_cas(char* ptr, int64_t new_val, int64_t old_val, size_t size) {
  772. switch (size) {
  773. case 1:
  774. return _InterlockedCompareExchange8((volatile char*)ptr, (char)new_val, (char)old_val);
  775. case 2:
  776. return _InterlockedCompareExchange16((volatile SHORT*)ptr, (SHORT)new_val, (SHORT)old_val);
  777. case 4:
  778. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  779. return InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  780. #else
  781. return _InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  782. #endif
  783. case 8:
  784. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  785. return InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  786. #else
  787. return _InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  788. #endif
  789. default:
  790. return 0x0;
  791. }
  792. }
  793. __inline int64_t enet_at_atomic_inc(char* ptr, int64_t delta, size_t data_size) {
  794. switch (data_size) {
  795. case 1:
  796. return _InterlockedExchangeAdd8((volatile char*)ptr, (char)delta);
  797. case 2:
  798. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, (SHORT)delta);
  799. case 4:
  800. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  801. return InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  802. #else
  803. return _InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  804. #endif
  805. case 8:
  806. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  807. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  808. #else
  809. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  810. #endif
  811. default:
  812. return 0x0;
  813. }
  814. }
  815. #define ENET_ATOMIC_READ(variable) enet_at_atomic_read((char*)(variable), ENET_ATOMIC_SIZEOF(variable))
  816. #define ENET_ATOMIC_WRITE(variable, new_val) enet_at_atomic_write((char*)(variable), (int64_t)(new_val), ENET_ATOMIC_SIZEOF(variable))
  817. #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))
  818. #define ENET_ATOMIC_INC(variable) enet_at_atomic_inc((char*)(variable), 1, ENET_ATOMIC_SIZEOF(variable))
  819. #define ENET_ATOMIC_DEC(variable) enet_at_atomic_inc((char*)(variable), -1, ENET_ATOMIC_SIZEOF(variable))
  820. #define ENET_ATOMIC_INC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), (delta), ENET_ATOMIC_SIZEOF(variable))
  821. #define ENET_ATOMIC_DEC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), -(delta), ENET_ATOMIC_SIZEOF(variable))
  822. #elif defined(__GNUC__) || defined(__clang__)
  823. #if defined(__clang__) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
  824. #define AT_HAVE_ATOMICS
  825. #endif
  826. /* We want to use __atomic built-ins if possible because the __sync primitives are
  827. deprecated, because the __atomic build-ins allow us to use ENET_ATOMIC_WRITE on
  828. uninitialized memory without running into undefined behavior, and because the
  829. __atomic versions generate more efficient code since we don't need to rely on
  830. CAS when we don't actually want it.
  831. Note that we use acquire-release memory order (like mutexes do). We could use
  832. sequentially consistent memory order but that has lower performance and is
  833. almost always unneeded. */
  834. #ifdef AT_HAVE_ATOMICS
  835. #define ENET_ATOMIC_READ(ptr) __atomic_load_n((ptr), __ATOMIC_ACQUIRE)
  836. #define ENET_ATOMIC_WRITE(ptr, value) __atomic_store_n((ptr), (value), __ATOMIC_RELEASE)
  837. #ifndef typeof
  838. #define typeof __typeof__
  839. #endif
  840. /* clang_analyzer doesn't know that CAS writes to memory so it complains about
  841. potentially lost data. Replace the code with the equivalent non-sync code. */
  842. #ifdef __clang_analyzer__
  843. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  844. ({ \
  845. typeof(*(ptr)) ENET_ATOMIC_CAS_old_actual_ = (*(ptr)); \
  846. if (ATOMIC_CAS_old_actual_ == (old_value)) \
  847. *(ptr) = new_value; \
  848. ENET_ATOMIC_CAS_old_actual_; \
  849. })
  850. #else
  851. /* Could use __auto_type instead of typeof but that shouldn't work in C++.
  852. The ({ }) syntax is a GCC extension called statement expression. It lets
  853. us return a value out of the macro.
  854. TODO We should return bool here instead of the old value to avoid the ABA
  855. problem. */
  856. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  857. ({ \
  858. typeof(*(ptr)) ENET_ATOMIC_CAS_expected_ = (old_value); \
  859. __atomic_compare_exchange_n((ptr), &ENET_ATOMIC_CAS_expected_, (new_value), false, \
  860. __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE); \
  861. ENET_ATOMIC_CAS_expected_; \
  862. })
  863. #endif
  864. #define ENET_ATOMIC_INC(ptr) __atomic_fetch_add((ptr), 1, __ATOMIC_ACQ_REL)
  865. #define ENET_ATOMIC_DEC(ptr) __atomic_fetch_sub((ptr), 1, __ATOMIC_ACQ_REL)
  866. #define ENET_ATOMIC_INC_BY(ptr, delta) __atomic_fetch_add((ptr), (delta), __ATOMIC_ACQ_REL)
  867. #define ENET_ATOMIC_DEC_BY(ptr, delta) __atomic_fetch_sub((ptr), (delta), __ATOMIC_ACQ_REL)
  868. #else
  869. #define ENET_ATOMIC_READ(variable) __sync_fetch_and_add(variable, 0)
  870. #define ENET_ATOMIC_WRITE(variable, new_val) (void)__sync_val_compare_and_swap((variable), *(variable), (new_val))
  871. #define ENET_ATOMIC_CAS(variable, old_value, new_val) __sync_val_compare_and_swap((variable), (old_value), (new_val))
  872. #define ENET_ATOMIC_INC(variable) __sync_fetch_and_add((variable), 1)
  873. #define ENET_ATOMIC_DEC(variable) __sync_fetch_and_sub((variable), 1)
  874. #define ENET_ATOMIC_INC_BY(variable, delta) __sync_fetch_and_add((variable), (delta), 1)
  875. #define ENET_ATOMIC_DEC_BY(variable, delta) __sync_fetch_and_sub((variable), (delta), 1)
  876. #endif
  877. #undef AT_HAVE_ATOMICS
  878. #endif
  879. /*
  880. =======================================================================
  881. Callbacks
  882. =======================================================================
  883. */
  884. static ENetCallbacks callbacks = {
  885. malloc,
  886. free,
  887. abort
  888. };
  889. int enet_initialize_with_callbacks(ENetVersion version, const ENetCallbacks* inits) {
  890. if (version < ENET_VERSION_CREATE(1, 3, 0))
  891. return -1;
  892. if (inits->malloc != NULL || inits->free != NULL) {
  893. if (inits->malloc == NULL || inits->free == NULL)
  894. return -1;
  895. callbacks.malloc = inits->malloc;
  896. callbacks.free = inits->free;
  897. }
  898. if (inits->noMemory != NULL)
  899. callbacks.noMemory = inits->noMemory;
  900. return enet_initialize();
  901. }
  902. void* enet_malloc(size_t size) {
  903. void* memory = callbacks.malloc(size);
  904. if (memory == NULL)
  905. callbacks.noMemory();
  906. return memory;
  907. }
  908. void enet_free(void* memory) {
  909. callbacks.free(memory);
  910. }
  911. /*
  912. =======================================================================
  913. List
  914. =======================================================================
  915. */
  916. void enet_list_clear(ENetList* list) {
  917. list->sentinel.next = &list->sentinel;
  918. list->sentinel.previous = &list->sentinel;
  919. }
  920. ENetListIterator enet_list_insert(ENetListIterator position, void* data) {
  921. ENetListIterator result = (ENetListIterator)data;
  922. result->previous = position->previous;
  923. result->next = position;
  924. result->previous->next = result;
  925. position->previous = result;
  926. return result;
  927. }
  928. void* enet_list_remove(ENetListIterator position) {
  929. position->previous->next = position->next;
  930. position->next->previous = position->previous;
  931. return position;
  932. }
  933. ENetListIterator enet_list_move(ENetListIterator position, void* dataFirst, void* dataLast) {
  934. ENetListIterator first = (ENetListIterator)dataFirst;
  935. ENetListIterator last = (ENetListIterator)dataLast;
  936. first->previous->next = last->next;
  937. last->next->previous = first->previous;
  938. first->previous = position->previous;
  939. last->next = position;
  940. first->previous->next = first;
  941. position->previous = last;
  942. return first;
  943. }
  944. size_t enet_list_size(ENetList* list) {
  945. size_t size = 0;
  946. ENetListIterator position;
  947. for (position = enet_list_begin(list); position != enet_list_end(list); position = enet_list_next(position)) {
  948. ++size;
  949. }
  950. return size;
  951. }
  952. /*
  953. =======================================================================
  954. Utilities
  955. =======================================================================
  956. */
  957. ENetVersion enet_linked_version(void) {
  958. return ENET_VERSION;
  959. }
  960. int enet_array_is_zeroed(const uint8_t* array, int length) {
  961. size_t i;
  962. for (i = 0; i < length; i++) {
  963. if (array[i] != 0)
  964. return -1;
  965. }
  966. return 0;
  967. }
  968. size_t enet_string_copy(char* destination, const char* source, size_t length) {
  969. char *d = destination;
  970. const char *s = source;
  971. size_t n = length;
  972. if (n != 0 && --n != 0) {
  973. do {
  974. if ((*d++ = *s++) == 0)
  975. break;
  976. }
  977. while (--n != 0);
  978. }
  979. if (n == 0) {
  980. if (length != 0)
  981. *d = '\0';
  982. while (*s++);
  983. }
  984. return (s - source - 1);
  985. }
  986. /*
  987. =======================================================================
  988. Time
  989. =======================================================================
  990. */
  991. #ifdef _WIN32
  992. static LARGE_INTEGER gettime_offset(void) {
  993. SYSTEMTIME s;
  994. FILETIME f;
  995. LARGE_INTEGER t;
  996. s.wYear = 1970;
  997. s.wMonth = 1;
  998. s.wDay = 1;
  999. s.wHour = 0;
  1000. s.wMinute = 0;
  1001. s.wSecond = 0;
  1002. s.wMilliseconds = 0;
  1003. SystemTimeToFileTime(&s, &f);
  1004. t.QuadPart = f.dwHighDateTime;
  1005. t.QuadPart <<= 32;
  1006. t.QuadPart |= f.dwLowDateTime;
  1007. return t;
  1008. }
  1009. int clock_gettime(int X, struct timespec* tv) {
  1010. LARGE_INTEGER t;
  1011. FILETIME f;
  1012. double microseconds;
  1013. static LARGE_INTEGER offset;
  1014. static double frequencyToMicroseconds;
  1015. static int initialized = 0;
  1016. static BOOL usePerformanceCounter = 0;
  1017. if (!initialized) {
  1018. LARGE_INTEGER performanceFrequency;
  1019. initialized = 1;
  1020. usePerformanceCounter = QueryPerformanceFrequency(&performanceFrequency);
  1021. if (usePerformanceCounter) {
  1022. QueryPerformanceCounter(&offset);
  1023. frequencyToMicroseconds = (double)performanceFrequency.QuadPart / 1000000.;
  1024. } else {
  1025. offset = gettime_offset();
  1026. frequencyToMicroseconds = 10.;
  1027. }
  1028. }
  1029. if (usePerformanceCounter) {
  1030. QueryPerformanceCounter(&t);
  1031. } else {
  1032. GetSystemTimeAsFileTime(&f);
  1033. t.QuadPart = f.dwHighDateTime;
  1034. t.QuadPart <<= 32;
  1035. t.QuadPart |= f.dwLowDateTime;
  1036. }
  1037. t.QuadPart -= offset.QuadPart;
  1038. microseconds = (double)t.QuadPart / frequencyToMicroseconds;
  1039. t.QuadPart = (LONGLONG)microseconds;
  1040. tv->tv_sec = (long)(t.QuadPart / 1000000);
  1041. tv->tv_nsec = t.QuadPart % 1000000 * 1000;
  1042. return 0;
  1043. }
  1044. #elif __APPLE__ && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 && !defined(CLOCK_MONOTONIC)
  1045. #define CLOCK_MONOTONIC 0
  1046. int clock_gettime(int X, struct timespec* ts) {
  1047. clock_serv_t cclock;
  1048. mach_timespec_t mts;
  1049. host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
  1050. clock_get_time(cclock, &mts);
  1051. mach_port_deallocate(mach_task_self(), cclock);
  1052. ts->tv_sec = mts.tv_sec;
  1053. ts->tv_nsec = mts.tv_nsec;
  1054. return 0;
  1055. }
  1056. #endif
  1057. enet_uint32 enet_time_get(void) {
  1058. static enet_uint64 start_time_ns = 0;
  1059. struct timespec ts;
  1060. #ifdef CLOCK_MONOTONIC_RAW
  1061. clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
  1062. #else
  1063. clock_gettime(CLOCK_MONOTONIC, &ts);
  1064. #endif
  1065. static const enet_uint64 ns_in_s = 1000 * 1000 * 1000;
  1066. static const enet_uint64 ns_in_ms = 1000 * 1000;
  1067. enet_uint64 current_time_ns = ts.tv_nsec + (enet_uint64)ts.tv_sec * ns_in_s;
  1068. enet_uint64 offset_ns = ENET_ATOMIC_READ(&start_time_ns);
  1069. if (offset_ns == 0) {
  1070. enet_uint64 want_value = current_time_ns - 1 * ns_in_ms;
  1071. enet_uint64 old_value = ENET_ATOMIC_CAS(&start_time_ns, 0, want_value);
  1072. offset_ns = old_value == 0 ? want_value : old_value;
  1073. }
  1074. enet_uint64 result_in_ns = current_time_ns - offset_ns;
  1075. return (enet_uint32)(result_in_ns / ns_in_ms);
  1076. }
  1077. /*
  1078. =======================================================================
  1079. Checksum
  1080. =======================================================================
  1081. */
  1082. static int initializedCRC32 = 0;
  1083. static enet_uint32 crcTable[256];
  1084. static enet_uint32 reflect_crc(int val, int bits) {
  1085. int result = 0, bit;
  1086. for (bit = 0; bit < bits; bit++) {
  1087. if (val & 1)
  1088. result |= 1 << (bits - 1 - bit);
  1089. val >>= 1;
  1090. }
  1091. return result;
  1092. }
  1093. static void initialize_crc32(void) {
  1094. int byte;
  1095. for (byte = 0; byte < 256; ++byte) {
  1096. enet_uint32 crc = reflect_crc(byte, 8) << 24;
  1097. int offset;
  1098. for (offset = 0; offset < 8; ++offset) {
  1099. if (crc & 0x80000000)
  1100. crc = (crc << 1) ^ 0x04c11db7;
  1101. else
  1102. crc <<= 1;
  1103. }
  1104. crcTable[byte] = reflect_crc(crc, 32);
  1105. }
  1106. initializedCRC32 = 1;
  1107. }
  1108. enet_uint32 enet_crc32(const ENetBuffer* buffers, size_t bufferCount) {
  1109. enet_uint32 crc = 0xFFFFFFFF;
  1110. if (!initializedCRC32)
  1111. initialize_crc32();
  1112. while (bufferCount-- > 0) {
  1113. const enet_uint8* data = (const enet_uint8*)buffers->data;
  1114. const enet_uint8* dataEnd = &data[buffers->dataLength];
  1115. while (data < dataEnd) {
  1116. crc = (crc >> 8) ^ crcTable[(crc & 0xFF)^* data++];
  1117. }
  1118. ++buffers;
  1119. }
  1120. return ENET_HOST_TO_NET_32(~crc);
  1121. }
  1122. /*
  1123. =======================================================================
  1124. Packet
  1125. =======================================================================
  1126. */
  1127. ENetPacket* enet_packet_create(const void* data, size_t dataLength, enet_uint32 flags) {
  1128. ENetPacket* packet;
  1129. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1130. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1131. if (packet == NULL)
  1132. return NULL;
  1133. packet->data = (enet_uint8*)data;
  1134. } else {
  1135. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength);
  1136. if (packet == NULL)
  1137. return NULL;
  1138. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1139. if (data != NULL)
  1140. memcpy(packet->data, data, dataLength);
  1141. }
  1142. packet->referenceCount = 0;
  1143. packet->flags = flags;
  1144. packet->dataLength = dataLength;
  1145. packet->freeCallback = NULL;
  1146. return packet;
  1147. }
  1148. ENetPacket* enet_packet_create_offset(const void* data, size_t dataLength, size_t dataOffset, enet_uint32 flags) {
  1149. ENetPacket* packet;
  1150. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1151. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1152. if (packet == NULL)
  1153. return NULL;
  1154. packet->data = (enet_uint8*)data;
  1155. } else {
  1156. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength - dataOffset);
  1157. if (packet == NULL)
  1158. return NULL;
  1159. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1160. if (data != NULL)
  1161. memcpy(packet->data, (char*)data + dataOffset, dataLength - dataOffset);
  1162. }
  1163. packet->referenceCount = 0;
  1164. packet->flags = flags;
  1165. packet->dataLength = dataLength - dataOffset;
  1166. packet->freeCallback = NULL;
  1167. return packet;
  1168. }
  1169. void enet_packet_destroy(ENetPacket* packet) {
  1170. if (packet == NULL)
  1171. return;
  1172. if (packet->freeCallback != NULL)
  1173. (*packet->freeCallback)((void*)packet);
  1174. enet_free(packet);
  1175. }
  1176. /*
  1177. =======================================================================
  1178. Protocol
  1179. =======================================================================
  1180. */
  1181. static size_t commandSizes[ENET_PROTOCOL_COMMAND_COUNT] = {
  1182. 0,
  1183. sizeof(ENetProtocolAcknowledge),
  1184. sizeof(ENetProtocolConnect),
  1185. sizeof(ENetProtocolVerifyConnect),
  1186. sizeof(ENetProtocolDisconnect),
  1187. sizeof(ENetProtocolPing),
  1188. sizeof(ENetProtocolSendReliable),
  1189. sizeof(ENetProtocolSendUnreliable),
  1190. sizeof(ENetProtocolSendFragment),
  1191. sizeof(ENetProtocolSendUnsequenced),
  1192. sizeof(ENetProtocolBandwidthLimit),
  1193. sizeof(ENetProtocolThrottleConfigure),
  1194. sizeof(ENetProtocolSendFragment)
  1195. };
  1196. size_t enet_protocol_command_size(enet_uint8 commandNumber) {
  1197. return commandSizes[commandNumber & ENET_PROTOCOL_COMMAND_MASK];
  1198. }
  1199. static void enet_protocol_change_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1200. if (state == ENET_PEER_STATE_CONNECTED || state == ENET_PEER_STATE_DISCONNECT_LATER)
  1201. enet_peer_on_connect(peer);
  1202. else
  1203. enet_peer_on_disconnect(peer);
  1204. peer->state = state;
  1205. }
  1206. static void enet_protocol_dispatch_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1207. enet_protocol_change_state(host, peer, state);
  1208. if (!peer->needsDispatch) {
  1209. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1210. peer->needsDispatch = 1;
  1211. }
  1212. }
  1213. static int enet_protocol_dispatch_incoming_commands(ENetHost* host, ENetEvent* event) {
  1214. while (!enet_list_empty(&host->dispatchQueue)) {
  1215. ENetPeer* peer = (ENetPeer*)enet_list_remove(enet_list_begin(&host->dispatchQueue));
  1216. peer->needsDispatch = 0;
  1217. switch (peer->state) {
  1218. case ENET_PEER_STATE_CONNECTION_PENDING:
  1219. case ENET_PEER_STATE_CONNECTION_SUCCEEDED:
  1220. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1221. event->type = ENET_EVENT_TYPE_CONNECT;
  1222. event->peer = peer;
  1223. event->data = peer->eventData;
  1224. return 1;
  1225. case ENET_PEER_STATE_ZOMBIE:
  1226. host->recalculateBandwidthLimits = 1;
  1227. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1228. event->peer = peer;
  1229. event->data = peer->eventData;
  1230. enet_peer_reset(peer);
  1231. return 1;
  1232. case ENET_PEER_STATE_CONNECTED:
  1233. if (enet_list_empty(&peer->dispatchedCommands))
  1234. continue;
  1235. event->packet = enet_peer_receive(peer, &event->channelID);
  1236. if (event->packet == NULL)
  1237. continue;
  1238. event->type = ENET_EVENT_TYPE_RECEIVE;
  1239. event->peer = peer;
  1240. if (!enet_list_empty(&peer->dispatchedCommands)) {
  1241. peer->needsDispatch = 1;
  1242. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1243. }
  1244. return 1;
  1245. default:
  1246. break;
  1247. }
  1248. }
  1249. return 0;
  1250. }
  1251. static void enet_protocol_notify_connect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1252. host->recalculateBandwidthLimits = 1;
  1253. if (event != NULL) {
  1254. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1255. peer->totalDataSent = 0;
  1256. peer->totalDataReceived = 0;
  1257. peer->totalPacketsSent = 0;
  1258. peer->totalPacketsLost = 0;
  1259. event->type = ENET_EVENT_TYPE_CONNECT;
  1260. event->peer = peer;
  1261. event->data = peer->eventData;
  1262. } else {
  1263. enet_protocol_dispatch_state(host, peer, peer->state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING);
  1264. }
  1265. }
  1266. static void enet_protocol_notify_disconnect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1267. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1268. host->recalculateBandwidthLimits = 1;
  1269. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1270. enet_peer_reset(peer);
  1271. } else if (event != NULL) {
  1272. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1273. event->peer = peer;
  1274. event->data = 0;
  1275. enet_peer_reset(peer);
  1276. } else {
  1277. peer->eventData = 0;
  1278. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1279. }
  1280. }
  1281. static void enet_protocol_notify_disconnect_timeout(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1282. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1283. host->recalculateBandwidthLimits = 1;
  1284. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1285. enet_peer_reset(peer);
  1286. } else if (event != NULL) {
  1287. event->type = ENET_EVENT_TYPE_DISCONNECT_TIMEOUT;
  1288. event->peer = peer;
  1289. event->data = 0;
  1290. enet_peer_reset(peer);
  1291. } else {
  1292. peer->eventData = 0;
  1293. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1294. }
  1295. }
  1296. static void enet_protocol_remove_sent_unreliable_commands(ENetPeer* peer) {
  1297. ENetOutgoingCommand* outgoingCommand;
  1298. if (enet_list_empty(&peer->sentUnreliableCommands))
  1299. return;
  1300. do {
  1301. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentUnreliableCommands);
  1302. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1303. if (outgoingCommand->packet != NULL) {
  1304. --outgoingCommand->packet->referenceCount;
  1305. if (outgoingCommand->packet->referenceCount == 0) {
  1306. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1307. enet_packet_destroy(outgoingCommand->packet);
  1308. }
  1309. }
  1310. enet_free(outgoingCommand);
  1311. }
  1312. while (!enet_list_empty(&peer->sentUnreliableCommands));
  1313. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1314. enet_peer_disconnect(peer, peer->eventData);
  1315. }
  1316. static ENetProtocolCommand enet_protocol_remove_sent_reliable_command(ENetPeer* peer, enet_uint16 reliableSequenceNumber, enet_uint8 channelID) {
  1317. ENetOutgoingCommand* outgoingCommand = NULL;
  1318. ENetListIterator currentCommand;
  1319. ENetProtocolCommand commandNumber;
  1320. int wasSent = 1;
  1321. for (currentCommand = enet_list_begin(&peer->sentReliableCommands); currentCommand != enet_list_end(&peer->sentReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1322. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1323. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1324. break;
  1325. }
  1326. if (currentCommand == enet_list_end(&peer->sentReliableCommands)) {
  1327. for (currentCommand = enet_list_begin(&peer->outgoingReliableCommands); currentCommand != enet_list_end(&peer->outgoingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1328. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1329. if (outgoingCommand->sendAttempts < 1)
  1330. return ENET_PROTOCOL_COMMAND_NONE;
  1331. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1332. break;
  1333. }
  1334. if (currentCommand == enet_list_end(&peer->outgoingReliableCommands))
  1335. return ENET_PROTOCOL_COMMAND_NONE;
  1336. wasSent = 0;
  1337. }
  1338. if (outgoingCommand == NULL)
  1339. return ENET_PROTOCOL_COMMAND_NONE;
  1340. if (channelID < peer->channelCount) {
  1341. ENetChannel* channel = &peer->channels[channelID];
  1342. enet_uint16 reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1343. if (channel->reliableWindows[reliableWindow] > 0) {
  1344. --channel->reliableWindows[reliableWindow];
  1345. if (!channel->reliableWindows[reliableWindow])
  1346. channel->usedReliableWindows &= ~(1 << reliableWindow);
  1347. }
  1348. }
  1349. commandNumber = (ENetProtocolCommand)(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK);
  1350. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1351. if (outgoingCommand->packet != NULL) {
  1352. if (wasSent)
  1353. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  1354. --outgoingCommand->packet->referenceCount;
  1355. if (outgoingCommand->packet->referenceCount == 0) {
  1356. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1357. enet_packet_destroy(outgoingCommand->packet);
  1358. }
  1359. }
  1360. enet_free(outgoingCommand);
  1361. if (enet_list_empty(&peer->sentReliableCommands))
  1362. return commandNumber;
  1363. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentReliableCommands);
  1364. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  1365. return commandNumber;
  1366. }
  1367. static ENetPeer* enet_protocol_handle_connect(ENetHost* host, ENetProtocolHeader* header, ENetProtocol* command) {
  1368. enet_uint8 incomingSessionID, outgoingSessionID;
  1369. enet_uint32 mtu, windowSize;
  1370. ENetChannel* channel;
  1371. size_t channelCount, duplicatePeers = 0;
  1372. ENetPeer* currentPeer, *peer = NULL;
  1373. ENetProtocol verifyCommand;
  1374. channelCount = ENET_NET_TO_HOST_32(command->connect.channelCount);
  1375. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  1376. return NULL;
  1377. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  1378. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED) {
  1379. if (peer == NULL)
  1380. peer = currentPeer;
  1381. } else if (currentPeer->state != ENET_PEER_STATE_CONNECTING && enet_in6_equal(currentPeer->address.ipv6, host->receivedAddress.ipv6)) {
  1382. if (currentPeer->address.port == host->receivedAddress.port && currentPeer->connectID == command->connect.connectID)
  1383. return NULL;
  1384. ++duplicatePeers;
  1385. }
  1386. }
  1387. if (peer == NULL || duplicatePeers >= host->duplicatePeers)
  1388. return NULL;
  1389. if (channelCount > host->channelLimit)
  1390. channelCount = host->channelLimit;
  1391. peer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  1392. if (peer->channels == NULL)
  1393. return NULL;
  1394. peer->channelCount = channelCount;
  1395. peer->state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
  1396. peer->connectID = command->connect.connectID;
  1397. peer->address = host->receivedAddress;
  1398. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->connect.outgoingPeerID);
  1399. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->connect.incomingBandwidth);
  1400. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->connect.outgoingBandwidth);
  1401. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->connect.packetThrottleInterval);
  1402. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleAcceleration);
  1403. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleDeceleration);
  1404. peer->eventData = ENET_NET_TO_HOST_32(command->connect.data);
  1405. incomingSessionID = command->connect.incomingSessionID == 0xFF ? peer->outgoingSessionID : command->connect.incomingSessionID;
  1406. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1407. if (incomingSessionID == peer->outgoingSessionID)
  1408. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1409. peer->outgoingSessionID = incomingSessionID;
  1410. outgoingSessionID = command->connect.outgoingSessionID == 0xFF ? peer->incomingSessionID : command->connect.outgoingSessionID;
  1411. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1412. if (outgoingSessionID == peer->incomingSessionID)
  1413. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1414. peer->incomingSessionID = outgoingSessionID;
  1415. for (channel = peer->channels; channel < &peer->channels[channelCount]; ++channel) {
  1416. channel->outgoingReliableSequenceNumber = 0;
  1417. channel->outgoingUnreliableSequenceNumber = 0;
  1418. channel->incomingReliableSequenceNumber = 0;
  1419. channel->incomingUnreliableSequenceNumber = 0;
  1420. enet_list_clear(&channel->incomingReliableCommands);
  1421. enet_list_clear(&channel->incomingUnreliableCommands);
  1422. channel->usedReliableWindows = 0;
  1423. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  1424. }
  1425. mtu = ENET_NET_TO_HOST_32(command->connect.mtu);
  1426. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1427. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1428. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1429. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1430. peer->mtu = mtu;
  1431. if (host->outgoingBandwidth == 0 && peer->incomingBandwidth == 0)
  1432. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1433. else if (host->outgoingBandwidth == 0 || peer->incomingBandwidth == 0)
  1434. peer->windowSize = (ENET_MAX(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1435. else
  1436. peer->windowSize = (ENET_MIN(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1437. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1438. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1439. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1440. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1441. if (host->incomingBandwidth == 0)
  1442. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1443. else
  1444. windowSize = (host->incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1445. if (windowSize > ENET_NET_TO_HOST_32(command->connect.windowSize))
  1446. windowSize = ENET_NET_TO_HOST_32(command->connect.windowSize);
  1447. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1448. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1449. else if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1450. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1451. verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  1452. verifyCommand.header.channelID = 0xFF;
  1453. verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16(peer->incomingPeerID);
  1454. verifyCommand.verifyConnect.incomingSessionID = incomingSessionID;
  1455. verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID;
  1456. verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_32(peer->mtu);
  1457. verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32(windowSize);
  1458. verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  1459. verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  1460. verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  1461. verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32(peer->packetThrottleInterval);
  1462. verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(peer->packetThrottleAcceleration);
  1463. verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(peer->packetThrottleDeceleration);
  1464. verifyCommand.verifyConnect.connectID = peer->connectID;
  1465. enet_peer_queue_outgoing_command(peer, &verifyCommand, NULL, 0, 0);
  1466. return peer;
  1467. }
  1468. static int enet_protocol_handle_send_reliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1469. size_t dataLength;
  1470. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1471. return -1;
  1472. dataLength = ENET_NET_TO_HOST_16(command->sendReliable.dataLength);
  1473. *currentData += dataLength;
  1474. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1475. return -1;
  1476. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendReliable), dataLength, ENET_PACKET_FLAG_RELIABLE, 0) == NULL)
  1477. return -1;
  1478. return 0;
  1479. }
  1480. static int enet_protocol_handle_send_unsequenced(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1481. enet_uint32 unsequencedGroup, index;
  1482. size_t dataLength;
  1483. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1484. return -1;
  1485. dataLength = ENET_NET_TO_HOST_16(command->sendUnsequenced.dataLength);
  1486. *currentData += dataLength;
  1487. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1488. return -1;
  1489. unsequencedGroup = ENET_NET_TO_HOST_16(command->sendUnsequenced.unsequencedGroup);
  1490. index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
  1491. if (unsequencedGroup < peer->incomingUnsequencedGroup)
  1492. unsequencedGroup += 0x10000;
  1493. if (unsequencedGroup >= (enet_uint32)peer->incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE)
  1494. return 0;
  1495. unsequencedGroup &= 0xFFFF;
  1496. if (unsequencedGroup - index != peer->incomingUnsequencedGroup) {
  1497. peer->incomingUnsequencedGroup = unsequencedGroup - index;
  1498. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  1499. } else if (peer->unsequencedWindow[index / 32] & (1 << (index % 32))) {
  1500. return 0;
  1501. }
  1502. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnsequenced), dataLength, ENET_PACKET_FLAG_UNSEQUENCED, 0) == NULL)
  1503. return -1;
  1504. peer->unsequencedWindow[index / 32] |= 1 << (index % 32);
  1505. return 0;
  1506. }
  1507. static int enet_protocol_handle_send_unreliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1508. size_t dataLength;
  1509. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1510. return -1;
  1511. dataLength = ENET_NET_TO_HOST_16(command->sendUnreliable.dataLength);
  1512. *currentData += dataLength;
  1513. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1514. return -1;
  1515. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnreliable), dataLength, 0, 0) == NULL)
  1516. return -1;
  1517. return 0;
  1518. }
  1519. static int enet_protocol_handle_send_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1520. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, startSequenceNumber, totalLength;
  1521. ENetChannel* channel;
  1522. enet_uint16 startWindow, currentWindow;
  1523. ENetListIterator currentCommand;
  1524. ENetIncomingCommand* startCommand = NULL;
  1525. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1526. return -1;
  1527. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1528. *currentData += fragmentLength;
  1529. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1530. return -1;
  1531. channel = &peer->channels[command->header.channelID];
  1532. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1533. startWindow = startSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1534. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1535. if (startSequenceNumber < channel->incomingReliableSequenceNumber)
  1536. startWindow += ENET_PEER_RELIABLE_WINDOWS;
  1537. if (startWindow < currentWindow || startWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1538. return 0;
  1539. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1540. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1541. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1542. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1543. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1544. return -1;
  1545. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1546. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1547. if (startSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1548. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1549. continue;
  1550. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1551. break;
  1552. }
  1553. if (incomingCommand->reliableSequenceNumber <= startSequenceNumber) {
  1554. if (incomingCommand->reliableSequenceNumber < startSequenceNumber)
  1555. break;
  1556. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1557. return -1;
  1558. startCommand = incomingCommand;
  1559. break;
  1560. }
  1561. }
  1562. if (startCommand == NULL) {
  1563. ENetProtocol hostCommand = *command;
  1564. hostCommand.header.reliableSequenceNumber = startSequenceNumber;
  1565. startCommand = enet_peer_queue_incoming_command(peer, &hostCommand, NULL, totalLength, ENET_PACKET_FLAG_RELIABLE, fragmentCount);
  1566. if (startCommand == NULL)
  1567. return -1;
  1568. }
  1569. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1570. --startCommand->fragmentsRemaining;
  1571. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1572. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1573. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1574. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1575. if (startCommand->fragmentsRemaining <= 0)
  1576. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  1577. }
  1578. return 0;
  1579. }
  1580. static int enet_protocol_handle_send_unreliable_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1581. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, reliableSequenceNumber, startSequenceNumber, totalLength;
  1582. enet_uint16 reliableWindow, currentWindow;
  1583. ENetChannel* channel;
  1584. ENetListIterator currentCommand;
  1585. ENetIncomingCommand* startCommand = NULL;
  1586. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1587. return -1;
  1588. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1589. *currentData += fragmentLength;
  1590. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1591. return -1;
  1592. channel = &peer->channels[command->header.channelID];
  1593. reliableSequenceNumber = command->header.reliableSequenceNumber;
  1594. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1595. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1596. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1597. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1598. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  1599. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1600. return 0;
  1601. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && startSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  1602. return 0;
  1603. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1604. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1605. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1606. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1607. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1608. return -1;
  1609. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1610. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1611. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1612. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1613. continue;
  1614. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1615. break;
  1616. }
  1617. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  1618. break;
  1619. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  1620. continue;
  1621. if (incomingCommand->unreliableSequenceNumber <= startSequenceNumber) {
  1622. if (incomingCommand->unreliableSequenceNumber < startSequenceNumber)
  1623. break;
  1624. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1625. return -1;
  1626. startCommand = incomingCommand;
  1627. break;
  1628. }
  1629. }
  1630. if (startCommand == NULL) {
  1631. startCommand = enet_peer_queue_incoming_command(peer, command, NULL, totalLength,
  1632. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED, fragmentCount);
  1633. if (startCommand == NULL)
  1634. return -1;
  1635. }
  1636. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1637. --startCommand->fragmentsRemaining;
  1638. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1639. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1640. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1641. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1642. if (startCommand->fragmentsRemaining <= 0)
  1643. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  1644. }
  1645. return 0;
  1646. }
  1647. static int enet_protocol_handle_ping(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1648. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1649. return -1;
  1650. return 0;
  1651. }
  1652. static int enet_protocol_handle_bandwidth_limit(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1653. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1654. return -1;
  1655. if (peer->incomingBandwidth != 0)
  1656. --host->bandwidthLimitedPeers;
  1657. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.incomingBandwidth);
  1658. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.outgoingBandwidth);
  1659. if (peer->incomingBandwidth != 0)
  1660. ++host->bandwidthLimitedPeers;
  1661. if (peer->incomingBandwidth == 0 && host->outgoingBandwidth == 0)
  1662. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1663. else if (peer->incomingBandwidth == 0 || host->outgoingBandwidth == 0)
  1664. peer->windowSize = (ENET_MAX(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1665. else
  1666. peer->windowSize = (ENET_MIN(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1667. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1668. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1669. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1670. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1671. return 0;
  1672. }
  1673. static int enet_protocol_handle_throttle_configure(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1674. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1675. return -1;
  1676. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleInterval);
  1677. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleAcceleration);
  1678. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleDeceleration);
  1679. return 0;
  1680. }
  1681. static int enet_protocol_handle_disconnect(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1682. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT)
  1683. return 0;
  1684. enet_peer_reset_queues(peer);
  1685. if (peer->state == ENET_PEER_STATE_CONNECTION_SUCCEEDED || peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_CONNECTING) {
  1686. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1687. } else if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1688. if (peer->state == ENET_PEER_STATE_CONNECTION_PENDING)
  1689. host->recalculateBandwidthLimits = 1;
  1690. enet_peer_reset(peer);
  1691. } else if (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  1692. enet_protocol_change_state(host, peer, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT);
  1693. } else {
  1694. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1695. }
  1696. if (peer->state != ENET_PEER_STATE_DISCONNECTED)
  1697. peer->eventData = ENET_NET_TO_HOST_32(command->disconnect.data);
  1698. return 0;
  1699. }
  1700. static int enet_protocol_handle_acknowledge(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1701. enet_uint32 roundTripTime, receivedSentTime, receivedReliableSequenceNumber;
  1702. ENetProtocolCommand commandNumber;
  1703. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE)
  1704. return 0;
  1705. receivedSentTime = ENET_NET_TO_HOST_16(command->acknowledge.receivedSentTime);
  1706. receivedSentTime |= host->serviceTime & 0xFFFF0000;
  1707. if ((receivedSentTime & 0x8000) > (host->serviceTime & 0x8000))
  1708. receivedSentTime -= 0x10000;
  1709. if (ENET_TIME_LESS(host->serviceTime, receivedSentTime))
  1710. return 0;
  1711. peer->lastReceiveTime = host->serviceTime;
  1712. peer->earliestTimeout = 0;
  1713. roundTripTime = ENET_TIME_DIFFERENCE(host->serviceTime, receivedSentTime);
  1714. if (roundTripTime == 0)
  1715. roundTripTime = 1;
  1716. if (peer->smoothedRoundTripTime == 0)
  1717. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * ENET_SRTT_INITIAL + ENET_SRTT_PARA_G * roundTripTime);
  1718. else
  1719. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * peer->smoothedRoundTripTime + ENET_SRTT_PARA_G * roundTripTime);
  1720. enet_peer_throttle(peer, peer->smoothedRoundTripTime);
  1721. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1722. if (peer->smoothedRoundTripTime >= peer->roundTripTime) {
  1723. peer->roundTripTime += (peer->smoothedRoundTripTime - peer->roundTripTime) / 8;
  1724. peer->roundTripTimeVariance += (peer->smoothedRoundTripTime - peer->roundTripTime) / 4;
  1725. } else {
  1726. peer->roundTripTime -= (peer->roundTripTime - peer->smoothedRoundTripTime) / 8;
  1727. peer->roundTripTimeVariance += (peer->roundTripTime - peer->smoothedRoundTripTime) / 4;
  1728. }
  1729. if (peer->roundTripTime < peer->lowestRoundTripTime)
  1730. peer->lowestRoundTripTime = peer->roundTripTime;
  1731. if (peer->roundTripTimeVariance > peer->highestRoundTripTimeVariance)
  1732. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1733. if (peer->packetThrottleEpoch == 0 || ENET_TIME_DIFFERENCE(host->serviceTime, peer->packetThrottleEpoch) >= peer->packetThrottleInterval) {
  1734. peer->lastRoundTripTime = peer->lowestRoundTripTime;
  1735. peer->lastRoundTripTimeVariance = peer->highestRoundTripTimeVariance;
  1736. peer->lowestRoundTripTime = peer->roundTripTime;
  1737. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1738. peer->packetThrottleEpoch = host->serviceTime;
  1739. }
  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. #ifdef ENET_LZ4
  1826. if (flags & ENET_PROTOCOL_HEADER_FLAG_COMPRESSED) {
  1827. size_t originalSize = LZ4_decompress_safe((const char*)host->receivedData + headerSize, (char*)host->packetData[1] + headerSize, host->receivedDataLength - headerSize, sizeof(host->packetData[1]) - headerSize);
  1828. if (originalSize <= 0 || originalSize > sizeof(host->packetData[1]) - headerSize)
  1829. return 0;
  1830. memcpy(host->packetData[1], header, headerSize);
  1831. host->receivedData = host->packetData[1];
  1832. host->receivedDataLength = headerSize + originalSize;
  1833. }
  1834. #endif
  1835. if (host->checksumCallback != NULL) {
  1836. enet_uint32* checksum = (enet_uint32*)&host->receivedData[headerSize - sizeof(enet_uint32)];
  1837. enet_uint32 desiredChecksum = *checksum;
  1838. ENetBuffer buffer;
  1839. *checksum = peer != NULL ? peer->connectID : 0;
  1840. buffer.data = host->receivedData;
  1841. buffer.dataLength = host->receivedDataLength;
  1842. if (host->checksumCallback(&buffer, 1) != desiredChecksum)
  1843. return 0;
  1844. }
  1845. if (peer != NULL) {
  1846. peer->address.ipv6 = host->receivedAddress.ipv6;
  1847. peer->address.port = host->receivedAddress.port;
  1848. peer->incomingDataTotal += host->receivedDataLength;
  1849. peer->totalDataReceived += host->receivedDataLength;
  1850. }
  1851. currentData = host->receivedData + headerSize;
  1852. while (currentData < &host->receivedData[host->receivedDataLength]) {
  1853. enet_uint8 commandNumber;
  1854. size_t commandSize;
  1855. command = (ENetProtocol*)currentData;
  1856. if (currentData + sizeof(ENetProtocolCommandHeader) > &host->receivedData[host->receivedDataLength])
  1857. break;
  1858. commandNumber = command->header.command & ENET_PROTOCOL_COMMAND_MASK;
  1859. if (commandNumber >= ENET_PROTOCOL_COMMAND_COUNT)
  1860. break;
  1861. commandSize = commandSizes[commandNumber];
  1862. if (commandSize == 0 || currentData + commandSize > &host->receivedData[host->receivedDataLength])
  1863. break;
  1864. currentData += commandSize;
  1865. if (peer == NULL && (commandNumber != ENET_PROTOCOL_COMMAND_CONNECT || currentData < &host->receivedData[host->receivedDataLength]))
  1866. break;
  1867. command->header.reliableSequenceNumber = ENET_NET_TO_HOST_16(command->header.reliableSequenceNumber);
  1868. switch (commandNumber) {
  1869. case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE:
  1870. if (enet_protocol_handle_acknowledge(host, event, peer, command))
  1871. goto commandError;
  1872. break;
  1873. case ENET_PROTOCOL_COMMAND_CONNECT:
  1874. if (peer != NULL)
  1875. goto commandError;
  1876. if (host->preventConnections == 0) {
  1877. peer = enet_protocol_handle_connect(host, header, command);
  1878. if (peer == NULL)
  1879. goto commandError;
  1880. }
  1881. break;
  1882. case ENET_PROTOCOL_COMMAND_VERIFY_CONNECT:
  1883. if (enet_protocol_handle_verify_connect(host, event, peer, command))
  1884. goto commandError;
  1885. break;
  1886. case ENET_PROTOCOL_COMMAND_DISCONNECT:
  1887. if (enet_protocol_handle_disconnect(host, peer, command))
  1888. goto commandError;
  1889. break;
  1890. case ENET_PROTOCOL_COMMAND_PING:
  1891. if (enet_protocol_handle_ping(host, peer, command))
  1892. goto commandError;
  1893. break;
  1894. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  1895. if (enet_protocol_handle_send_reliable(host, peer, command, &currentData))
  1896. goto commandError;
  1897. break;
  1898. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  1899. if (enet_protocol_handle_send_unreliable(host, peer, command, &currentData))
  1900. goto commandError;
  1901. break;
  1902. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  1903. if (enet_protocol_handle_send_unsequenced(host, peer, command, &currentData))
  1904. goto commandError;
  1905. break;
  1906. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  1907. if (enet_protocol_handle_send_fragment(host, peer, command, &currentData))
  1908. goto commandError;
  1909. break;
  1910. case ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT:
  1911. if (enet_protocol_handle_bandwidth_limit(host, peer, command))
  1912. goto commandError;
  1913. break;
  1914. case ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE:
  1915. if (enet_protocol_handle_throttle_configure(host, peer, command))
  1916. goto commandError;
  1917. break;
  1918. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  1919. if (enet_protocol_handle_send_unreliable_fragment(host, peer, command, &currentData))
  1920. goto commandError;
  1921. break;
  1922. default:
  1923. goto commandError;
  1924. }
  1925. if (peer != NULL && (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0) {
  1926. enet_uint16 sentTime;
  1927. if (!(flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME))
  1928. break;
  1929. sentTime = ENET_NET_TO_HOST_16(header->sentTime);
  1930. switch (peer->state) {
  1931. case ENET_PEER_STATE_DISCONNECTING:
  1932. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1933. case ENET_PEER_STATE_DISCONNECTED:
  1934. case ENET_PEER_STATE_ZOMBIE:
  1935. break;
  1936. case ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT:
  1937. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  1938. enet_peer_queue_acknowledgement(peer, command, sentTime);
  1939. break;
  1940. default:
  1941. enet_peer_queue_acknowledgement(peer, command, sentTime);
  1942. break;
  1943. }
  1944. }
  1945. }
  1946. commandError:
  1947. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  1948. return 1;
  1949. return 0;
  1950. }
  1951. static int enet_protocol_receive_incoming_commands(ENetHost* host, ENetEvent* event) {
  1952. int packets;
  1953. for (packets = 0; packets < 256; ++packets) {
  1954. int receivedLength;
  1955. ENetBuffer buffer;
  1956. buffer.data = host->packetData[0];
  1957. buffer.dataLength = host->mtu;
  1958. receivedLength = enet_socket_receive(host->socket, &host->receivedAddress, &buffer, 1);
  1959. if (receivedLength == -2)
  1960. continue;
  1961. if (receivedLength < 0)
  1962. return -1;
  1963. if (receivedLength == 0)
  1964. return 0;
  1965. host->receivedData = host->packetData[0];
  1966. host->receivedDataLength = receivedLength;
  1967. host->totalReceivedData += receivedLength;
  1968. host->totalReceivedPackets++;
  1969. if (host->interceptCallback != NULL) {
  1970. switch (host->interceptCallback(host, (void*)event)) {
  1971. case 1:
  1972. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  1973. return 1;
  1974. continue;
  1975. case -1:
  1976. return -1;
  1977. default:
  1978. break;
  1979. }
  1980. }
  1981. switch (enet_protocol_handle_incoming_commands(host, event)) {
  1982. case 1:
  1983. return 1;
  1984. case -1:
  1985. return -1;
  1986. default:
  1987. break;
  1988. }
  1989. }
  1990. return -1;
  1991. }
  1992. static void enet_protocol_send_acknowledgements(ENetHost* host, ENetPeer* peer) {
  1993. ENetProtocol* command = &host->commands[host->commandCount];
  1994. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  1995. ENetAcknowledgement* acknowledgement;
  1996. ENetListIterator currentAcknowledgement;
  1997. enet_uint16 reliableSequenceNumber;
  1998. currentAcknowledgement = enet_list_begin(&peer->acknowledgements);
  1999. while (currentAcknowledgement != enet_list_end(&peer->acknowledgements)) {
  2000. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < sizeof(ENetProtocolAcknowledge)) {
  2001. host->continueSending = 1;
  2002. break;
  2003. }
  2004. acknowledgement = (ENetAcknowledgement*)currentAcknowledgement;
  2005. currentAcknowledgement = enet_list_next(currentAcknowledgement);
  2006. buffer->data = command;
  2007. buffer->dataLength = sizeof(ENetProtocolAcknowledge);
  2008. host->packetSize += buffer->dataLength;
  2009. reliableSequenceNumber = ENET_HOST_TO_NET_16(acknowledgement->command.header.reliableSequenceNumber);
  2010. command->header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
  2011. command->header.channelID = acknowledgement->command.header.channelID;
  2012. command->header.reliableSequenceNumber = reliableSequenceNumber;
  2013. command->acknowledge.receivedReliableSequenceNumber = reliableSequenceNumber;
  2014. command->acknowledge.receivedSentTime = ENET_HOST_TO_NET_16(acknowledgement->sentTime);
  2015. if ((acknowledgement->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2016. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  2017. enet_list_remove(&acknowledgement->acknowledgementList);
  2018. enet_free(acknowledgement);
  2019. ++command;
  2020. ++buffer;
  2021. }
  2022. host->commandCount = command - host->commands;
  2023. host->bufferCount = buffer - host->buffers;
  2024. }
  2025. static void enet_protocol_send_unreliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2026. ENetProtocol* command = &host->commands[host->commandCount];
  2027. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2028. ENetOutgoingCommand* outgoingCommand;
  2029. ENetListIterator currentCommand;
  2030. currentCommand = enet_list_begin(&peer->outgoingUnreliableCommands);
  2031. while (currentCommand != enet_list_end(&peer->outgoingUnreliableCommands)) {
  2032. size_t commandSize;
  2033. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2034. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2035. 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)) {
  2036. host->continueSending = 1;
  2037. break;
  2038. }
  2039. currentCommand = enet_list_next(currentCommand);
  2040. if (outgoingCommand->packet != NULL && outgoingCommand->fragmentOffset == 0) {
  2041. peer->packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER;
  2042. peer->packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE;
  2043. if (peer->packetThrottleCounter > peer->packetThrottle) {
  2044. enet_uint16 reliableSequenceNumber = outgoingCommand->reliableSequenceNumber;
  2045. enet_uint16 unreliableSequenceNumber = outgoingCommand->unreliableSequenceNumber;
  2046. for (;;) {
  2047. --outgoingCommand->packet->referenceCount;
  2048. if (outgoingCommand->packet->referenceCount == 0)
  2049. enet_packet_destroy(outgoingCommand->packet);
  2050. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2051. enet_free(outgoingCommand);
  2052. if (currentCommand == enet_list_end(&peer->outgoingUnreliableCommands))
  2053. break;
  2054. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2055. if (outgoingCommand->reliableSequenceNumber != reliableSequenceNumber || outgoingCommand->unreliableSequenceNumber != unreliableSequenceNumber)
  2056. break;
  2057. currentCommand = enet_list_next(currentCommand);
  2058. }
  2059. continue;
  2060. }
  2061. }
  2062. buffer->data = command;
  2063. buffer->dataLength = commandSize;
  2064. host->packetSize += buffer->dataLength;
  2065. *command = outgoingCommand->command;
  2066. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2067. if (outgoingCommand->packet != NULL) {
  2068. ++buffer;
  2069. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2070. buffer->dataLength = outgoingCommand->fragmentLength;
  2071. host->packetSize += buffer->dataLength;
  2072. enet_list_insert(enet_list_end(&peer->sentUnreliableCommands), outgoingCommand);
  2073. } else {
  2074. enet_free(outgoingCommand);
  2075. }
  2076. ++command;
  2077. ++buffer;
  2078. }
  2079. host->commandCount = command - host->commands;
  2080. host->bufferCount = buffer - host->buffers;
  2081. 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))
  2082. enet_peer_disconnect(peer, peer->eventData);
  2083. }
  2084. static int enet_protocol_check_timeouts(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  2085. ENetOutgoingCommand* outgoingCommand;
  2086. ENetListIterator currentCommand, insertPosition;
  2087. currentCommand = enet_list_begin(&peer->sentReliableCommands);
  2088. insertPosition = enet_list_begin(&peer->outgoingReliableCommands);
  2089. while (currentCommand != enet_list_end(&peer->sentReliableCommands)) {
  2090. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2091. currentCommand = enet_list_next(currentCommand);
  2092. if (ENET_TIME_DIFFERENCE(host->serviceTime, outgoingCommand->sentTime) < outgoingCommand->roundTripTimeout)
  2093. continue;
  2094. if (peer->earliestTimeout == 0 || ENET_TIME_LESS(outgoingCommand->sentTime, peer->earliestTimeout))
  2095. peer->earliestTimeout = outgoingCommand->sentTime;
  2096. 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))) {
  2097. enet_protocol_notify_disconnect_timeout(host, peer, event);
  2098. return 1;
  2099. }
  2100. if (outgoingCommand->packet != NULL)
  2101. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  2102. ++peer->packetsLost;
  2103. ++peer->totalPacketsLost;
  2104. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2105. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2106. enet_list_insert(insertPosition, enet_list_remove(&outgoingCommand->outgoingCommandList));
  2107. if (currentCommand == enet_list_begin(&peer->sentReliableCommands) && !enet_list_empty(&peer->sentReliableCommands)) {
  2108. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2109. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  2110. }
  2111. }
  2112. return 0;
  2113. }
  2114. static int enet_protocol_send_reliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2115. ENetProtocol* command = &host->commands[host->commandCount];
  2116. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2117. ENetOutgoingCommand* outgoingCommand;
  2118. ENetListIterator currentCommand;
  2119. ENetChannel* channel;
  2120. enet_uint16 reliableWindow;
  2121. size_t commandSize;
  2122. int windowExceeded = 0, windowWrap = 0, canPing = 1;
  2123. currentCommand = enet_list_begin(&peer->outgoingReliableCommands);
  2124. while (currentCommand != enet_list_end(&peer->outgoingReliableCommands)) {
  2125. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2126. channel = outgoingCommand->command.header.channelID < peer->channelCount ? &peer->channels[outgoingCommand->command.header.channelID] : NULL;
  2127. reliableWindow = outgoingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2128. if (channel != NULL) {
  2129. 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)))))
  2130. windowWrap = 1;
  2131. if (windowWrap) {
  2132. currentCommand = enet_list_next(currentCommand);
  2133. continue;
  2134. }
  2135. }
  2136. if (outgoingCommand->packet != NULL) {
  2137. if (!windowExceeded) {
  2138. enet_uint32 windowSize = (peer->packetThrottle * peer->windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE;
  2139. if (peer->reliableDataInTransit + outgoingCommand->fragmentLength > ENET_MAX(windowSize, peer->mtu))
  2140. windowExceeded = 1;
  2141. }
  2142. if (windowExceeded) {
  2143. currentCommand = enet_list_next(currentCommand);
  2144. continue;
  2145. }
  2146. }
  2147. canPing = 0;
  2148. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2149. 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))) {
  2150. host->continueSending = 1;
  2151. break;
  2152. }
  2153. currentCommand = enet_list_next(currentCommand);
  2154. if (channel != NULL && outgoingCommand->sendAttempts < 1) {
  2155. channel->usedReliableWindows |= 1 << reliableWindow;
  2156. ++channel->reliableWindows[reliableWindow];
  2157. }
  2158. ++outgoingCommand->sendAttempts;
  2159. if (outgoingCommand->roundTripTimeout == 0) {
  2160. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2161. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2162. }
  2163. if (enet_list_empty(&peer->sentReliableCommands))
  2164. peer->nextTimeout = host->serviceTime + outgoingCommand->roundTripTimeout;
  2165. enet_list_insert(enet_list_end(&peer->sentReliableCommands), enet_list_remove(&outgoingCommand->outgoingCommandList));
  2166. outgoingCommand->sentTime = host->serviceTime;
  2167. buffer->data = command;
  2168. buffer->dataLength = commandSize;
  2169. host->packetSize += buffer->dataLength;
  2170. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_SENT_TIME;
  2171. *command = outgoingCommand->command;
  2172. if (outgoingCommand->packet != NULL) {
  2173. ++buffer;
  2174. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2175. buffer->dataLength = outgoingCommand->fragmentLength;
  2176. host->packetSize += outgoingCommand->fragmentLength;
  2177. peer->reliableDataInTransit += outgoingCommand->fragmentLength;
  2178. }
  2179. ++peer->packetsSent;
  2180. ++peer->totalPacketsSent;
  2181. ++command;
  2182. ++buffer;
  2183. }
  2184. host->commandCount = command - host->commands;
  2185. host->bufferCount = buffer - host->buffers;
  2186. return canPing;
  2187. }
  2188. static int enet_protocol_send_outgoing_commands(ENetHost* host, ENetEvent* event, int checkForTimeouts) {
  2189. enet_uint8 headerData[sizeof(ENetProtocolHeader) + sizeof(enet_uint32)];
  2190. ENetProtocolHeader* header = (ENetProtocolHeader*)headerData;
  2191. ENetPeer* currentPeer;
  2192. int sentLength;
  2193. host->continueSending = 1;
  2194. #ifdef ENET_LZ4
  2195. size_t shouldCompress = 0;
  2196. #endif
  2197. while (host->continueSending) {
  2198. for (host->continueSending = 0, currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2199. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED || currentPeer->state == ENET_PEER_STATE_ZOMBIE)
  2200. continue;
  2201. host->headerFlags = 0;
  2202. host->commandCount = 0;
  2203. host->bufferCount = 1;
  2204. host->packetSize = sizeof(ENetProtocolHeader);
  2205. if (!enet_list_empty(&currentPeer->acknowledgements))
  2206. enet_protocol_send_acknowledgements(host, currentPeer);
  2207. if (checkForTimeouts != 0 && !enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_GREATER_EQUAL(host->serviceTime, currentPeer->nextTimeout) && enet_protocol_check_timeouts(host, currentPeer, event) == 1) {
  2208. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2209. return 1;
  2210. else
  2211. continue;
  2212. }
  2213. 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)) {
  2214. enet_peer_ping(currentPeer);
  2215. enet_protocol_send_reliable_outgoing_commands(host, currentPeer);
  2216. }
  2217. if (!enet_list_empty(&currentPeer->outgoingUnreliableCommands))
  2218. enet_protocol_send_unreliable_outgoing_commands(host, currentPeer);
  2219. if (host->commandCount == 0)
  2220. continue;
  2221. if (currentPeer->packetLossEpoch == 0) {
  2222. currentPeer->packetLossEpoch = host->serviceTime;
  2223. } else if (ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->packetLossEpoch) >= ENET_PEER_PACKET_LOSS_INTERVAL && currentPeer->packetsSent > 0) {
  2224. enet_uint32 packetLoss = currentPeer->packetsLost * ENET_PEER_PACKET_LOSS_SCALE / currentPeer->packetsSent;
  2225. #ifdef ENET_DEBUG
  2226. printf(
  2227. "peer %u: %f%%+-%f%% packet loss, %u+-%u ms round trip time, %f%% throttle, %u/%u outgoing, %u/%u incoming\n", currentPeer->incomingPeerID,
  2228. currentPeer->packetLoss / (float)ENET_PEER_PACKET_LOSS_SCALE,
  2229. currentPeer->packetLossVariance / (float)ENET_PEER_PACKET_LOSS_SCALE, currentPeer->roundTripTime, currentPeer->roundTripTimeVariance,
  2230. currentPeer->packetThrottle / (float)ENET_PEER_PACKET_THROTTLE_SCALE,
  2231. enet_list_size(&currentPeer->outgoingReliableCommands),
  2232. enet_list_size(&currentPeer->outgoingUnreliableCommands),
  2233. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingReliableCommands) : 0,
  2234. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingUnreliableCommands) : 0
  2235. );
  2236. #endif
  2237. currentPeer->packetLossVariance -= currentPeer->packetLossVariance / 4;
  2238. if (packetLoss >= currentPeer->packetLoss) {
  2239. currentPeer->packetLoss += (packetLoss - currentPeer->packetLoss) / 8;
  2240. currentPeer->packetLossVariance += (packetLoss - currentPeer->packetLoss) / 4;
  2241. } else {
  2242. currentPeer->packetLoss -= (currentPeer->packetLoss - packetLoss) / 8;
  2243. currentPeer->packetLossVariance += (currentPeer->packetLoss - packetLoss) / 4;
  2244. }
  2245. currentPeer->packetLossEpoch = host->serviceTime;
  2246. currentPeer->packetsSent = 0;
  2247. currentPeer->packetsLost = 0;
  2248. }
  2249. host->buffers->data = headerData;
  2250. if (host->headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME) {
  2251. header->sentTime = ENET_HOST_TO_NET_16(host->serviceTime & 0xFFFF);
  2252. host->buffers->dataLength = sizeof(ENetProtocolHeader);
  2253. } else {
  2254. host->buffers->dataLength = (size_t)&((ENetProtocolHeader*)0)->sentTime;
  2255. }
  2256. #ifdef ENET_LZ4
  2257. if (host->compression == 1 && host->packetSize > 64) {
  2258. size_t originalSize = host->packetSize - sizeof(ENetProtocolHeader), compressedSize = 0;
  2259. const ENetBuffer* buffers = &host->buffers[1];
  2260. if (host->compressionBufferSize < originalSize) {
  2261. enet_free(host->compressionBuffer);
  2262. host->compressionBuffer = (char*)enet_malloc(originalSize);
  2263. host->compressionBufferSize = originalSize;
  2264. }
  2265. size_t totalSize = originalSize, dataSize = 0;
  2266. while (totalSize) {
  2267. size_t i;
  2268. for (i = 0; i < host->bufferCount - 1; i++) {
  2269. size_t copySize = ENET_MIN(totalSize, buffers[i].dataLength);
  2270. memcpy(host->compressionBuffer + dataSize, buffers[i].data, copySize);
  2271. totalSize -= copySize;
  2272. dataSize += copySize;
  2273. }
  2274. }
  2275. compressedSize = LZ4_compress_default((const char*)host->compressionBuffer, (char*)host->packetData[1], dataSize, originalSize);
  2276. if (compressedSize > 0 && compressedSize < originalSize) {
  2277. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_COMPRESSED;
  2278. shouldCompress = compressedSize;
  2279. #ifdef ENET_DEBUG
  2280. printf("peer %u: compressed %u->%u (%u%%)\n", currentPeer->incomingPeerID, originalSize, compressedSize, (compressedSize * 100) / originalSize);
  2281. #endif
  2282. }
  2283. }
  2284. #endif
  2285. if (currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2286. host->headerFlags |= currentPeer->outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  2287. header->peerID = ENET_HOST_TO_NET_16(currentPeer->outgoingPeerID | host->headerFlags);
  2288. if (host->checksumCallback != NULL) {
  2289. enet_uint32* checksum = (enet_uint32*)&headerData[host->buffers->dataLength];
  2290. *checksum = currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer->connectID : 0;
  2291. host->buffers->dataLength += sizeof(enet_uint32);
  2292. *checksum = host->checksumCallback(host->buffers, host->bufferCount);
  2293. }
  2294. #ifdef ENET_LZ4
  2295. if (shouldCompress > 0) {
  2296. host->buffers[1].data = host->packetData[1];
  2297. host->buffers[1].dataLength = shouldCompress;
  2298. host->bufferCount = 2;
  2299. }
  2300. #endif
  2301. currentPeer->lastSendTime = host->serviceTime;
  2302. sentLength = enet_socket_send(host->socket, &currentPeer->address, host->buffers, host->bufferCount);
  2303. enet_protocol_remove_sent_unreliable_commands(currentPeer);
  2304. if (sentLength < 0)
  2305. return -1;
  2306. host->totalSentData += sentLength;
  2307. currentPeer->totalDataSent += sentLength;
  2308. host->totalSentPackets++;
  2309. }
  2310. }
  2311. return 0;
  2312. }
  2313. void enet_host_flush(ENetHost* host) {
  2314. host->serviceTime = enet_time_get();
  2315. enet_protocol_send_outgoing_commands(host, NULL, 0);
  2316. }
  2317. int enet_host_check_events(ENetHost* host, ENetEvent* event) {
  2318. if (event == NULL)
  2319. return -1;
  2320. event->type = ENET_EVENT_TYPE_NONE;
  2321. event->peer = NULL;
  2322. event->packet = NULL;
  2323. return enet_protocol_dispatch_incoming_commands(host, event);
  2324. }
  2325. int enet_host_service(ENetHost* host, ENetEvent* event, enet_uint32 timeout) {
  2326. enet_uint32 waitCondition;
  2327. if (event != NULL) {
  2328. event->type = ENET_EVENT_TYPE_NONE;
  2329. event->peer = NULL;
  2330. event->packet = NULL;
  2331. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2332. case 1:
  2333. return 1;
  2334. case -1:
  2335. #ifdef ENET_DEBUG
  2336. perror("Error dispatching incoming packets");
  2337. #endif
  2338. return -1;
  2339. default:
  2340. break;
  2341. }
  2342. }
  2343. host->serviceTime = enet_time_get();
  2344. timeout += host->serviceTime;
  2345. do {
  2346. if (ENET_TIME_DIFFERENCE(host->serviceTime, host->bandwidthThrottleEpoch) >= ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  2347. enet_host_bandwidth_throttle(host);
  2348. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2349. case 1:
  2350. return 1;
  2351. case -1:
  2352. #ifdef ENET_DEBUG
  2353. perror("Error sending outgoing packets");
  2354. #endif
  2355. return -1;
  2356. default:
  2357. break;
  2358. }
  2359. switch (enet_protocol_receive_incoming_commands(host, event)) {
  2360. case 1:
  2361. return 1;
  2362. case -1:
  2363. #ifdef ENET_DEBUG
  2364. perror("Error receiving incoming packets");
  2365. #endif
  2366. return -1;
  2367. default:
  2368. break;
  2369. }
  2370. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2371. case 1:
  2372. return 1;
  2373. case -1:
  2374. #ifdef ENET_DEBUG
  2375. perror("Error sending outgoing packets");
  2376. #endif
  2377. return -1;
  2378. default:
  2379. break;
  2380. }
  2381. if (event != NULL) {
  2382. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2383. case 1:
  2384. return 1;
  2385. case -1:
  2386. #ifdef ENET_DEBUG
  2387. perror("Error dispatching incoming packets");
  2388. #endif
  2389. return -1;
  2390. default:
  2391. break;
  2392. }
  2393. }
  2394. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2395. return 0;
  2396. do {
  2397. host->serviceTime = enet_time_get();
  2398. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2399. return 0;
  2400. waitCondition = ENET_SOCKET_WAIT_RECEIVE | ENET_SOCKET_WAIT_INTERRUPT;
  2401. if (enet_socket_wait(host->socket, &waitCondition, ENET_TIME_DIFFERENCE(timeout, host->serviceTime)) != 0)
  2402. return -1;
  2403. }
  2404. while (waitCondition & ENET_SOCKET_WAIT_INTERRUPT);
  2405. host->serviceTime = enet_time_get();
  2406. }
  2407. while (waitCondition & ENET_SOCKET_WAIT_RECEIVE);
  2408. return 0;
  2409. }
  2410. /*
  2411. =======================================================================
  2412. Peer
  2413. =======================================================================
  2414. */
  2415. void enet_peer_throttle_configure(ENetPeer* peer, enet_uint32 interval, enet_uint32 acceleration, enet_uint32 deceleration, enet_uint32 threshold) {
  2416. ENetProtocol command;
  2417. peer->packetThrottleThreshold = threshold;
  2418. peer->packetThrottleInterval = interval;
  2419. peer->packetThrottleAcceleration = acceleration;
  2420. peer->packetThrottleDeceleration = deceleration;
  2421. command.header.command = ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2422. command.header.channelID = 0xFF;
  2423. command.throttleConfigure.packetThrottleInterval = ENET_HOST_TO_NET_32(interval);
  2424. command.throttleConfigure.packetThrottleAcceleration = ENET_HOST_TO_NET_32(acceleration);
  2425. command.throttleConfigure.packetThrottleDeceleration = ENET_HOST_TO_NET_32(deceleration);
  2426. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2427. }
  2428. int enet_peer_throttle(ENetPeer* peer, enet_uint32 rtt) {
  2429. if (peer->lastRoundTripTime <= peer->lastRoundTripTimeVariance) {
  2430. peer->packetThrottle = peer->packetThrottleLimit;
  2431. } else if (rtt < peer->lastRoundTripTime) {
  2432. peer->packetThrottle += peer->packetThrottleAcceleration;
  2433. if (peer->packetThrottle > peer->packetThrottleLimit)
  2434. peer->packetThrottle = peer->packetThrottleLimit;
  2435. return 1;
  2436. } else if (rtt > peer->lastRoundTripTime + peer->packetThrottleThreshold + 2 * peer->lastRoundTripTimeVariance) {
  2437. if (peer->packetThrottle > peer->packetThrottleDeceleration)
  2438. peer->packetThrottle -= peer->packetThrottleDeceleration;
  2439. else
  2440. peer->packetThrottle = 0;
  2441. return -1;
  2442. }
  2443. return 0;
  2444. }
  2445. int enet_peer_send(ENetPeer* peer, enet_uint8 channelID, ENetPacket* packet) {
  2446. ENetChannel* channel = &peer->channels[channelID];
  2447. ENetProtocol command;
  2448. size_t fragmentLength;
  2449. if (peer->state != ENET_PEER_STATE_CONNECTED || channelID >= peer->channelCount || packet->dataLength > peer->host->maximumPacketSize)
  2450. return -1;
  2451. fragmentLength = peer->mtu - sizeof(ENetProtocolHeader) - sizeof(ENetProtocolSendFragment);
  2452. if (peer->host->checksumCallback != NULL)
  2453. fragmentLength -= sizeof(enet_uint32);
  2454. if (packet->dataLength > fragmentLength) {
  2455. enet_uint32 fragmentCount = (packet->dataLength + fragmentLength - 1) / fragmentLength, fragmentNumber, fragmentOffset;
  2456. enet_uint8 commandNumber;
  2457. enet_uint16 startSequenceNumber;
  2458. ENetList fragments;
  2459. ENetOutgoingCommand* fragment;
  2460. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2461. return -1;
  2462. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED)) == ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED && channel->outgoingUnreliableSequenceNumber < 0xFFFF) {
  2463. commandNumber = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT;
  2464. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingUnreliableSequenceNumber + 1);
  2465. } else {
  2466. commandNumber = ENET_PROTOCOL_COMMAND_SEND_FRAGMENT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2467. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingReliableSequenceNumber + 1);
  2468. }
  2469. enet_list_clear(&fragments);
  2470. for (fragmentNumber = 0, fragmentOffset = 0; fragmentOffset < packet->dataLength; ++fragmentNumber, fragmentOffset += fragmentLength) {
  2471. if (packet->dataLength - fragmentOffset < fragmentLength)
  2472. fragmentLength = packet->dataLength - fragmentOffset;
  2473. fragment = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2474. if (fragment == NULL) {
  2475. while (!enet_list_empty(&fragments)) {
  2476. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2477. enet_free(fragment);
  2478. }
  2479. return -1;
  2480. }
  2481. fragment->fragmentOffset = fragmentOffset;
  2482. fragment->fragmentLength = fragmentLength;
  2483. fragment->packet = packet;
  2484. fragment->command.header.command = commandNumber;
  2485. fragment->command.header.channelID = channelID;
  2486. fragment->command.sendFragment.startSequenceNumber = startSequenceNumber;
  2487. fragment->command.sendFragment.dataLength = ENET_HOST_TO_NET_16(fragmentLength);
  2488. fragment->command.sendFragment.fragmentCount = ENET_HOST_TO_NET_32(fragmentCount);
  2489. fragment->command.sendFragment.fragmentNumber = ENET_HOST_TO_NET_32(fragmentNumber);
  2490. fragment->command.sendFragment.totalLength = ENET_HOST_TO_NET_32(packet->dataLength);
  2491. fragment->command.sendFragment.fragmentOffset = ENET_NET_TO_HOST_32(fragmentOffset);
  2492. enet_list_insert(enet_list_end(&fragments), fragment);
  2493. }
  2494. packet->referenceCount += fragmentNumber;
  2495. while (!enet_list_empty(&fragments)) {
  2496. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2497. enet_peer_setup_outgoing_command(peer, fragment);
  2498. }
  2499. return 0;
  2500. }
  2501. command.header.channelID = channelID;
  2502. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNSEQUENCED)) == ENET_PACKET_FLAG_UNSEQUENCED) {
  2503. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2504. command.sendUnsequenced.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2505. } else if (packet->flags & ENET_PACKET_FLAG_RELIABLE || channel->outgoingUnreliableSequenceNumber >= 0xFFFF) {
  2506. command.header.command = ENET_PROTOCOL_COMMAND_SEND_RELIABLE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2507. command.sendReliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2508. } else {
  2509. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE;
  2510. command.sendUnreliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2511. }
  2512. if (enet_peer_queue_outgoing_command(peer, &command, packet, 0, packet->dataLength) == NULL)
  2513. return -1;
  2514. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  2515. enet_host_flush(peer->host);
  2516. return 0;
  2517. }
  2518. ENetPacket* enet_peer_receive(ENetPeer* peer, enet_uint8* channelID) {
  2519. ENetIncomingCommand* incomingCommand;
  2520. ENetPacket* packet;
  2521. if (enet_list_empty(&peer->dispatchedCommands))
  2522. return NULL;
  2523. incomingCommand = (ENetIncomingCommand*)enet_list_remove(enet_list_begin(&peer->dispatchedCommands));
  2524. if (channelID != NULL)
  2525. *channelID = incomingCommand->command.header.channelID;
  2526. packet = incomingCommand->packet;
  2527. --packet->referenceCount;
  2528. if (incomingCommand->fragments != NULL)
  2529. enet_free(incomingCommand->fragments);
  2530. enet_free(incomingCommand);
  2531. peer->totalWaitingData -= packet->dataLength;
  2532. return packet;
  2533. }
  2534. static void enet_peer_reset_outgoing_commands(ENetList* queue) {
  2535. ENetOutgoingCommand* outgoingCommand;
  2536. while (!enet_list_empty(queue)) {
  2537. outgoingCommand = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(queue));
  2538. if (outgoingCommand->packet != NULL) {
  2539. --outgoingCommand->packet->referenceCount;
  2540. if (outgoingCommand->packet->referenceCount == 0)
  2541. enet_packet_destroy(outgoingCommand->packet);
  2542. }
  2543. enet_free(outgoingCommand);
  2544. }
  2545. }
  2546. static void enet_peer_remove_incoming_commands(ENetList* queue, ENetListIterator startCommand, ENetListIterator endCommand) {
  2547. ENetListIterator currentCommand;
  2548. for (currentCommand = startCommand; currentCommand != endCommand;) {
  2549. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2550. currentCommand = enet_list_next(currentCommand);
  2551. enet_list_remove(&incomingCommand->incomingCommandList);
  2552. if (incomingCommand->packet != NULL) {
  2553. --incomingCommand->packet->referenceCount;
  2554. if (incomingCommand->packet->referenceCount == 0)
  2555. enet_packet_destroy(incomingCommand->packet);
  2556. }
  2557. if (incomingCommand->fragments != NULL)
  2558. enet_free(incomingCommand->fragments);
  2559. enet_free(incomingCommand);
  2560. }
  2561. }
  2562. static void enet_peer_reset_incoming_commands(ENetList* queue) {
  2563. enet_peer_remove_incoming_commands(queue, enet_list_begin(queue), enet_list_end(queue));
  2564. }
  2565. void enet_peer_reset_queues(ENetPeer* peer) {
  2566. ENetChannel* channel;
  2567. if (peer->needsDispatch) {
  2568. enet_list_remove(&peer->dispatchList);
  2569. peer->needsDispatch = 0;
  2570. }
  2571. while (!enet_list_empty(&peer->acknowledgements)) {
  2572. enet_free(enet_list_remove(enet_list_begin(&peer->acknowledgements)));
  2573. }
  2574. enet_peer_reset_outgoing_commands(&peer->sentReliableCommands);
  2575. enet_peer_reset_outgoing_commands(&peer->sentUnreliableCommands);
  2576. enet_peer_reset_outgoing_commands(&peer->outgoingReliableCommands);
  2577. enet_peer_reset_outgoing_commands(&peer->outgoingUnreliableCommands);
  2578. enet_peer_reset_incoming_commands(&peer->dispatchedCommands);
  2579. if (peer->channels != NULL && peer->channelCount > 0) {
  2580. for (channel = peer->channels; channel < &peer->channels[peer->channelCount]; ++channel) {
  2581. enet_peer_reset_incoming_commands(&channel->incomingReliableCommands);
  2582. enet_peer_reset_incoming_commands(&channel->incomingUnreliableCommands);
  2583. }
  2584. enet_free(peer->channels);
  2585. }
  2586. peer->channels = NULL;
  2587. peer->channelCount = 0;
  2588. }
  2589. void enet_peer_on_connect(ENetPeer* peer) {
  2590. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  2591. if (peer->incomingBandwidth != 0)
  2592. ++peer->host->bandwidthLimitedPeers;
  2593. ++peer->host->connectedPeers;
  2594. }
  2595. }
  2596. void enet_peer_on_disconnect(ENetPeer* peer) {
  2597. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2598. if (peer->incomingBandwidth != 0)
  2599. --peer->host->bandwidthLimitedPeers;
  2600. --peer->host->connectedPeers;
  2601. }
  2602. }
  2603. void enet_peer_reset(ENetPeer* peer) {
  2604. enet_peer_on_disconnect(peer);
  2605. peer->outgoingPeerID = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  2606. peer->state = ENET_PEER_STATE_DISCONNECTED;
  2607. peer->incomingBandwidth = 0;
  2608. peer->outgoingBandwidth = 0;
  2609. peer->incomingBandwidthThrottleEpoch = 0;
  2610. peer->outgoingBandwidthThrottleEpoch = 0;
  2611. peer->incomingDataTotal = 0;
  2612. peer->totalDataReceived = 0;
  2613. peer->outgoingDataTotal = 0;
  2614. peer->totalDataSent = 0;
  2615. peer->lastSendTime = 0;
  2616. peer->lastReceiveTime = 0;
  2617. peer->nextTimeout = 0;
  2618. peer->earliestTimeout = 0;
  2619. peer->packetLossEpoch = 0;
  2620. peer->packetsSent = 0;
  2621. peer->totalPacketsSent = 0;
  2622. peer->packetsLost = 0;
  2623. peer->totalPacketsLost = 0;
  2624. peer->packetLoss = 0;
  2625. peer->packetLossVariance = 0;
  2626. peer->packetThrottle = ENET_PEER_DEFAULT_PACKET_THROTTLE;
  2627. peer->packetThrottleThreshold = ENET_PEER_PACKET_THROTTLE_THRESHOLD;
  2628. peer->packetThrottleLimit = ENET_PEER_PACKET_THROTTLE_SCALE;
  2629. peer->packetThrottleCounter = 0;
  2630. peer->packetThrottleEpoch = 0;
  2631. peer->packetThrottleAcceleration = ENET_PEER_PACKET_THROTTLE_ACCELERATION;
  2632. peer->packetThrottleDeceleration = ENET_PEER_PACKET_THROTTLE_DECELERATION;
  2633. peer->packetThrottleInterval = ENET_PEER_PACKET_THROTTLE_INTERVAL;
  2634. peer->pingInterval = ENET_PEER_PING_INTERVAL;
  2635. peer->timeoutLimit = ENET_PEER_TIMEOUT_LIMIT;
  2636. peer->timeoutMinimum = ENET_PEER_TIMEOUT_MINIMUM;
  2637. peer->timeoutMaximum = ENET_PEER_TIMEOUT_MAXIMUM;
  2638. peer->smoothedRoundTripTime = 0;
  2639. peer->lastRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2640. peer->lowestRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2641. peer->lastRoundTripTimeVariance = 0;
  2642. peer->highestRoundTripTimeVariance = 0;
  2643. peer->roundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2644. peer->roundTripTimeVariance = 0;
  2645. peer->mtu = peer->host->mtu;
  2646. peer->reliableDataInTransit = 0;
  2647. peer->outgoingReliableSequenceNumber = 0;
  2648. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  2649. peer->incomingUnsequencedGroup = 0;
  2650. peer->outgoingUnsequencedGroup = 0;
  2651. peer->eventData = 0;
  2652. peer->totalWaitingData = 0;
  2653. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  2654. enet_peer_reset_queues(peer);
  2655. }
  2656. void enet_peer_ping(ENetPeer* peer) {
  2657. ENetProtocol command;
  2658. if (peer->state != ENET_PEER_STATE_CONNECTED)
  2659. return;
  2660. command.header.command = ENET_PROTOCOL_COMMAND_PING | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2661. command.header.channelID = 0xFF;
  2662. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2663. }
  2664. void enet_peer_ping_interval(ENetPeer* peer, enet_uint32 pingInterval) {
  2665. peer->pingInterval = pingInterval ? pingInterval : ENET_PEER_PING_INTERVAL;
  2666. }
  2667. void enet_peer_timeout(ENetPeer* peer, enet_uint32 timeoutLimit, enet_uint32 timeoutMinimum, enet_uint32 timeoutMaximum) {
  2668. peer->timeoutLimit = timeoutLimit ? timeoutLimit : ENET_PEER_TIMEOUT_LIMIT;
  2669. peer->timeoutMinimum = timeoutMinimum ? timeoutMinimum : ENET_PEER_TIMEOUT_MINIMUM;
  2670. peer->timeoutMaximum = timeoutMaximum ? timeoutMaximum : ENET_PEER_TIMEOUT_MAXIMUM;
  2671. }
  2672. void enet_peer_disconnect_now(ENetPeer* peer, enet_uint32 data) {
  2673. ENetProtocol command;
  2674. if (peer->state == ENET_PEER_STATE_DISCONNECTED)
  2675. return;
  2676. if (peer->state != ENET_PEER_STATE_ZOMBIE && peer->state != ENET_PEER_STATE_DISCONNECTING) {
  2677. enet_peer_reset_queues(peer);
  2678. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2679. command.header.channelID = 0xFF;
  2680. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2681. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2682. enet_host_flush(peer->host);
  2683. }
  2684. enet_peer_reset(peer);
  2685. }
  2686. void enet_peer_disconnect(ENetPeer* peer, enet_uint32 data) {
  2687. ENetProtocol command;
  2688. 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)
  2689. return;
  2690. enet_peer_reset_queues(peer);
  2691. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT;
  2692. command.header.channelID = 0xFF;
  2693. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2694. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2695. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2696. else
  2697. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2698. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2699. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2700. enet_peer_on_disconnect(peer);
  2701. peer->state = ENET_PEER_STATE_DISCONNECTING;
  2702. } else {
  2703. enet_host_flush(peer->host);
  2704. enet_peer_reset(peer);
  2705. }
  2706. }
  2707. void enet_peer_disconnect_later(ENetPeer* peer, enet_uint32 data) {
  2708. 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))) {
  2709. peer->state = ENET_PEER_STATE_DISCONNECT_LATER;
  2710. peer->eventData = data;
  2711. } else {
  2712. enet_peer_disconnect(peer, data);
  2713. }
  2714. }
  2715. ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer* peer, const ENetProtocol* command, enet_uint16 sentTime) {
  2716. ENetAcknowledgement* acknowledgement;
  2717. if (command->header.channelID < peer->channelCount) {
  2718. ENetChannel* channel = &peer->channels[command->header.channelID];
  2719. enet_uint16 reliableWindow = command->header.reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2720. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2721. if (command->header.reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2722. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2723. if (reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1 && reliableWindow <= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS)
  2724. return NULL;
  2725. }
  2726. acknowledgement = (ENetAcknowledgement*)enet_malloc(sizeof(ENetAcknowledgement));
  2727. if (acknowledgement == NULL)
  2728. return NULL;
  2729. peer->outgoingDataTotal += sizeof(ENetProtocolAcknowledge);
  2730. acknowledgement->sentTime = sentTime;
  2731. acknowledgement->command = *command;
  2732. enet_list_insert(enet_list_end(&peer->acknowledgements), acknowledgement);
  2733. return acknowledgement;
  2734. }
  2735. void enet_peer_setup_outgoing_command(ENetPeer* peer, ENetOutgoingCommand* outgoingCommand) {
  2736. ENetChannel* channel = &peer->channels[outgoingCommand->command.header.channelID];
  2737. peer->outgoingDataTotal += enet_protocol_command_size(outgoingCommand->command.header.command) + outgoingCommand->fragmentLength;
  2738. if (outgoingCommand->command.header.channelID == 0xFF) {
  2739. ++peer->outgoingReliableSequenceNumber;
  2740. outgoingCommand->reliableSequenceNumber = peer->outgoingReliableSequenceNumber;
  2741. outgoingCommand->unreliableSequenceNumber = 0;
  2742. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2743. ++channel->outgoingReliableSequenceNumber;
  2744. channel->outgoingUnreliableSequenceNumber = 0;
  2745. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2746. outgoingCommand->unreliableSequenceNumber = 0;
  2747. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED) {
  2748. ++peer->outgoingUnsequencedGroup;
  2749. outgoingCommand->reliableSequenceNumber = 0;
  2750. outgoingCommand->unreliableSequenceNumber = 0;
  2751. } else {
  2752. if (outgoingCommand->fragmentOffset == 0)
  2753. ++channel->outgoingUnreliableSequenceNumber;
  2754. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2755. outgoingCommand->unreliableSequenceNumber = channel->outgoingUnreliableSequenceNumber;
  2756. }
  2757. outgoingCommand->sendAttempts = 0;
  2758. outgoingCommand->sentTime = 0;
  2759. outgoingCommand->roundTripTimeout = 0;
  2760. outgoingCommand->roundTripTimeoutLimit = 0;
  2761. outgoingCommand->command.header.reliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->reliableSequenceNumber);
  2762. switch (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2763. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2764. outgoingCommand->command.sendUnreliable.unreliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->unreliableSequenceNumber);
  2765. break;
  2766. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2767. outgoingCommand->command.sendUnsequenced.unsequencedGroup = ENET_HOST_TO_NET_16(peer->outgoingUnsequencedGroup);
  2768. break;
  2769. default:
  2770. break;
  2771. }
  2772. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)
  2773. enet_list_insert(enet_list_end(&peer->outgoingReliableCommands), outgoingCommand);
  2774. else
  2775. enet_list_insert(enet_list_end(&peer->outgoingUnreliableCommands), outgoingCommand);
  2776. }
  2777. ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer* peer, const ENetProtocol* command, ENetPacket* packet, enet_uint32 offset, enet_uint16 length) {
  2778. ENetOutgoingCommand* outgoingCommand = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2779. if (outgoingCommand == NULL)
  2780. return NULL;
  2781. outgoingCommand->command = *command;
  2782. outgoingCommand->fragmentOffset = offset;
  2783. outgoingCommand->fragmentLength = length;
  2784. outgoingCommand->packet = packet;
  2785. if (packet != NULL)
  2786. ++packet->referenceCount;
  2787. enet_peer_setup_outgoing_command(peer, outgoingCommand);
  2788. return outgoingCommand;
  2789. }
  2790. void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2791. ENetListIterator droppedCommand, startCommand, currentCommand;
  2792. for (droppedCommand = startCommand = currentCommand = enet_list_begin(&channel->incomingUnreliableCommands); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2793. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2794. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2795. continue;
  2796. if (incomingCommand->reliableSequenceNumber == channel->incomingReliableSequenceNumber) {
  2797. if (incomingCommand->fragmentsRemaining <= 0) {
  2798. channel->incomingUnreliableSequenceNumber = incomingCommand->unreliableSequenceNumber;
  2799. continue;
  2800. }
  2801. if (startCommand != currentCommand) {
  2802. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, 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. droppedCommand = currentCommand;
  2808. } else if (droppedCommand != currentCommand) {
  2809. droppedCommand = enet_list_previous(currentCommand);
  2810. }
  2811. } else {
  2812. enet_uint16 reliableWindow = incomingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2813. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2814. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2815. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2816. if (reliableWindow >= currentWindow && reliableWindow < currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2817. break;
  2818. droppedCommand = enet_list_next(currentCommand);
  2819. if (startCommand != currentCommand) {
  2820. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2821. if (!peer->needsDispatch) {
  2822. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2823. peer->needsDispatch = 1;
  2824. }
  2825. }
  2826. }
  2827. startCommand = enet_list_next(currentCommand);
  2828. }
  2829. if (startCommand != currentCommand) {
  2830. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2831. if (!peer->needsDispatch) {
  2832. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2833. peer->needsDispatch = 1;
  2834. }
  2835. droppedCommand = currentCommand;
  2836. }
  2837. enet_peer_remove_incoming_commands(&channel->incomingUnreliableCommands, enet_list_begin(&channel->incomingUnreliableCommands), droppedCommand);
  2838. }
  2839. void enet_peer_dispatch_incoming_reliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2840. ENetListIterator currentCommand;
  2841. for (currentCommand = enet_list_begin(&channel->incomingReliableCommands); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2842. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2843. if (incomingCommand->fragmentsRemaining > 0 || incomingCommand->reliableSequenceNumber != (enet_uint16)(channel->incomingReliableSequenceNumber + 1))
  2844. break;
  2845. channel->incomingReliableSequenceNumber = incomingCommand->reliableSequenceNumber;
  2846. if (incomingCommand->fragmentCount > 0)
  2847. channel->incomingReliableSequenceNumber += incomingCommand->fragmentCount - 1;
  2848. }
  2849. if (currentCommand == enet_list_begin(&channel->incomingReliableCommands))
  2850. return;
  2851. channel->incomingUnreliableSequenceNumber = 0;
  2852. enet_list_move(enet_list_end(&peer->dispatchedCommands), enet_list_begin(&channel->incomingReliableCommands), enet_list_previous(currentCommand));
  2853. if (!peer->needsDispatch) {
  2854. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2855. peer->needsDispatch = 1;
  2856. }
  2857. if (!enet_list_empty(&channel->incomingUnreliableCommands))
  2858. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2859. }
  2860. ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer* peer, const ENetProtocol* command, const void* data, size_t dataLength, enet_uint32 flags, enet_uint32 fragmentCount) {
  2861. static ENetIncomingCommand dummyCommand;
  2862. ENetChannel* channel = &peer->channels[command->header.channelID];
  2863. enet_uint32 unreliableSequenceNumber = 0, reliableSequenceNumber = 0;
  2864. enet_uint16 reliableWindow, currentWindow;
  2865. ENetIncomingCommand* incomingCommand;
  2866. ENetListIterator currentCommand;
  2867. ENetPacket* packet = NULL;
  2868. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2869. goto discardCommand;
  2870. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) {
  2871. reliableSequenceNumber = command->header.reliableSequenceNumber;
  2872. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2873. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2874. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2875. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2876. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2877. goto discardCommand;
  2878. }
  2879. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2880. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2881. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2882. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber)
  2883. goto discardCommand;
  2884. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2885. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2886. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2887. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2888. continue;
  2889. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2890. break;
  2891. }
  2892. if (incomingCommand->reliableSequenceNumber <= reliableSequenceNumber) {
  2893. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2894. break;
  2895. goto discardCommand;
  2896. }
  2897. }
  2898. break;
  2899. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2900. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  2901. unreliableSequenceNumber = ENET_NET_TO_HOST_16(command->sendUnreliable.unreliableSequenceNumber);
  2902. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && unreliableSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  2903. goto discardCommand;
  2904. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2905. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2906. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2907. continue;
  2908. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2909. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2910. continue;
  2911. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2912. break;
  2913. }
  2914. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2915. break;
  2916. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  2917. continue;
  2918. if (incomingCommand->unreliableSequenceNumber <= unreliableSequenceNumber) {
  2919. if (incomingCommand->unreliableSequenceNumber < unreliableSequenceNumber)
  2920. break;
  2921. goto discardCommand;
  2922. }
  2923. }
  2924. break;
  2925. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2926. currentCommand = enet_list_end(&channel->incomingUnreliableCommands);
  2927. break;
  2928. default:
  2929. goto discardCommand;
  2930. }
  2931. if (peer->totalWaitingData >= peer->host->maximumWaitingData)
  2932. goto notifyError;
  2933. packet = enet_packet_create(data, dataLength, flags);
  2934. if (packet == NULL)
  2935. goto notifyError;
  2936. incomingCommand = (ENetIncomingCommand*)enet_malloc(sizeof(ENetIncomingCommand));
  2937. if (incomingCommand == NULL)
  2938. goto notifyError;
  2939. incomingCommand->reliableSequenceNumber = command->header.reliableSequenceNumber;
  2940. incomingCommand->unreliableSequenceNumber = unreliableSequenceNumber & 0xFFFF;
  2941. incomingCommand->command = *command;
  2942. incomingCommand->fragmentCount = fragmentCount;
  2943. incomingCommand->fragmentsRemaining = fragmentCount;
  2944. incomingCommand->packet = packet;
  2945. incomingCommand->fragments = NULL;
  2946. if (fragmentCount > 0) {
  2947. if (fragmentCount <= ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2948. incomingCommand->fragments = (enet_uint32*)enet_malloc((fragmentCount + 31) / 32 * sizeof(enet_uint32));
  2949. if (incomingCommand->fragments == NULL) {
  2950. enet_free(incomingCommand);
  2951. goto notifyError;
  2952. }
  2953. memset(incomingCommand->fragments, 0, (fragmentCount + 31) / 32 * sizeof(enet_uint32));
  2954. }
  2955. if (packet != NULL) {
  2956. ++packet->referenceCount;
  2957. peer->totalWaitingData += packet->dataLength;
  2958. }
  2959. enet_list_insert(enet_list_next(currentCommand), incomingCommand);
  2960. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2961. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2962. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2963. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  2964. break;
  2965. default:
  2966. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2967. break;
  2968. }
  2969. return incomingCommand;
  2970. discardCommand:
  2971. if (fragmentCount > 0)
  2972. goto notifyError;
  2973. if (packet != NULL && packet->referenceCount == 0)
  2974. enet_packet_destroy(packet);
  2975. return &dummyCommand;
  2976. notifyError:
  2977. if (packet != NULL && packet->referenceCount == 0)
  2978. enet_packet_destroy(packet);
  2979. return NULL;
  2980. }
  2981. /*
  2982. =======================================================================
  2983. Host
  2984. =======================================================================
  2985. */
  2986. ENetHost* enet_host_create(const ENetAddress* address, size_t peerCount, size_t channelLimit, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth, int bufferSize) {
  2987. ENetHost* host;
  2988. ENetPeer* currentPeer;
  2989. if (peerCount > ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2990. return NULL;
  2991. host = (ENetHost*)enet_malloc(sizeof(ENetHost));
  2992. if (host == NULL)
  2993. return NULL;
  2994. memset(host, 0, sizeof(ENetHost));
  2995. host->peers = (ENetPeer*)enet_malloc(peerCount * sizeof(ENetPeer));
  2996. if (host->peers == NULL) {
  2997. enet_free(host);
  2998. return NULL;
  2999. }
  3000. memset(host->peers, 0, peerCount * sizeof(ENetPeer));
  3001. host->socket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
  3002. if (host->socket != ENET_SOCKET_NULL)
  3003. enet_socket_set_option(host->socket, ENET_SOCKOPT_IPV6_V6ONLY, 0);
  3004. if (host->socket == ENET_SOCKET_NULL || (address != NULL && enet_socket_bind(host->socket, address) < 0)) {
  3005. if (host->socket != ENET_SOCKET_NULL)
  3006. enet_socket_destroy(host->socket);
  3007. enet_free(host->peers);
  3008. enet_free(host);
  3009. return NULL;
  3010. }
  3011. if (bufferSize > ENET_HOST_BUFFER_SIZE_MAX)
  3012. bufferSize = ENET_HOST_BUFFER_SIZE_MAX;
  3013. else if (bufferSize < ENET_HOST_BUFFER_SIZE_MIN)
  3014. bufferSize = ENET_HOST_BUFFER_SIZE_MIN;
  3015. enet_socket_set_option(host->socket, ENET_SOCKOPT_NONBLOCK, 1);
  3016. enet_socket_set_option(host->socket, ENET_SOCKOPT_BROADCAST, 1);
  3017. enet_socket_set_option(host->socket, ENET_SOCKOPT_RCVBUF, bufferSize);
  3018. enet_socket_set_option(host->socket, ENET_SOCKOPT_SNDBUF, bufferSize);
  3019. if (address != NULL && enet_socket_get_address(host->socket, &host->address) < 0)
  3020. host->address = *address;
  3021. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3022. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3023. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3024. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3025. host->randomSeed = (enet_uint32)(size_t)host;
  3026. host->randomSeed += enet_host_random_seed();
  3027. host->randomSeed = (host->randomSeed << 16) | (host->randomSeed >> 16);
  3028. host->channelLimit = channelLimit;
  3029. host->incomingBandwidth = incomingBandwidth;
  3030. host->outgoingBandwidth = outgoingBandwidth;
  3031. host->bandwidthThrottleEpoch = 0;
  3032. host->recalculateBandwidthLimits = 0;
  3033. host->preventConnections = 0;
  3034. host->mtu = ENET_HOST_DEFAULT_MTU;
  3035. host->peerCount = peerCount;
  3036. host->commandCount = 0;
  3037. host->bufferCount = 0;
  3038. host->compression = 0;
  3039. host->compressionBufferSize = 0;
  3040. host->checksumCallback = NULL;
  3041. host->receivedAddress.ipv6 = ENET_HOST_ANY;
  3042. host->receivedAddress.port = 0;
  3043. host->receivedData = NULL;
  3044. host->receivedDataLength = 0;
  3045. host->totalSentData = 0;
  3046. host->totalSentPackets = 0;
  3047. host->totalReceivedData = 0;
  3048. host->totalReceivedPackets = 0;
  3049. host->connectedPeers = 0;
  3050. host->bandwidthLimitedPeers = 0;
  3051. host->duplicatePeers = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  3052. host->maximumPacketSize = ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE;
  3053. host->maximumWaitingData = ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA;
  3054. host->interceptCallback = NULL;
  3055. enet_list_clear(&host->dispatchQueue);
  3056. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3057. currentPeer->host = host;
  3058. currentPeer->incomingPeerID = currentPeer - host->peers;
  3059. currentPeer->outgoingSessionID = currentPeer->incomingSessionID = 0xFF;
  3060. currentPeer->data = NULL;
  3061. enet_list_clear(&currentPeer->acknowledgements);
  3062. enet_list_clear(&currentPeer->sentReliableCommands);
  3063. enet_list_clear(&currentPeer->sentUnreliableCommands);
  3064. enet_list_clear(&currentPeer->outgoingReliableCommands);
  3065. enet_list_clear(&currentPeer->outgoingUnreliableCommands);
  3066. enet_list_clear(&currentPeer->dispatchedCommands);
  3067. enet_peer_reset(currentPeer);
  3068. }
  3069. return host;
  3070. }
  3071. void enet_host_destroy(ENetHost* host) {
  3072. ENetPeer* currentPeer;
  3073. if (host == NULL)
  3074. return;
  3075. enet_socket_destroy(host->socket);
  3076. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3077. enet_peer_reset(currentPeer);
  3078. }
  3079. enet_free(host->peers);
  3080. enet_free(host->compressionBuffer);
  3081. enet_free(host);
  3082. }
  3083. void enet_host_enable_compression(ENetHost* host) {
  3084. if (host == NULL)
  3085. return;
  3086. host->compression = 1;
  3087. }
  3088. void enet_host_prevent_connections(ENetHost* host, enet_uint8 state) {
  3089. if (host == NULL)
  3090. return;
  3091. host->preventConnections = state;
  3092. }
  3093. ENetPeer* enet_host_connect(ENetHost* host, const ENetAddress* address, size_t channelCount, enet_uint32 data) {
  3094. ENetPeer* currentPeer;
  3095. ENetChannel* channel;
  3096. ENetProtocol command;
  3097. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3098. channelCount = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3099. else if (channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3100. channelCount = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3101. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3102. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED)
  3103. break;
  3104. }
  3105. if (currentPeer >= &host->peers[host->peerCount])
  3106. return NULL;
  3107. currentPeer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  3108. if (currentPeer->channels == NULL)
  3109. return NULL;
  3110. currentPeer->channelCount = channelCount;
  3111. currentPeer->state = ENET_PEER_STATE_CONNECTING;
  3112. currentPeer->address = *address;
  3113. currentPeer->connectID = ++host->randomSeed;
  3114. if (host->outgoingBandwidth == 0)
  3115. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3116. else
  3117. currentPeer->windowSize = (host->outgoingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3118. if (currentPeer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  3119. currentPeer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3120. else if (currentPeer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  3121. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3122. for (channel = currentPeer->channels; channel < &currentPeer->channels[channelCount]; ++channel) {
  3123. channel->outgoingReliableSequenceNumber = 0;
  3124. channel->outgoingUnreliableSequenceNumber = 0;
  3125. channel->incomingReliableSequenceNumber = 0;
  3126. channel->incomingUnreliableSequenceNumber = 0;
  3127. enet_list_clear(&channel->incomingReliableCommands);
  3128. enet_list_clear(&channel->incomingUnreliableCommands);
  3129. channel->usedReliableWindows = 0;
  3130. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  3131. }
  3132. command.header.command = ENET_PROTOCOL_COMMAND_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3133. command.header.channelID = 0xFF;
  3134. command.connect.outgoingPeerID = ENET_HOST_TO_NET_16(currentPeer->incomingPeerID);
  3135. command.connect.incomingSessionID = currentPeer->incomingSessionID;
  3136. command.connect.outgoingSessionID = currentPeer->outgoingSessionID;
  3137. command.connect.mtu = ENET_HOST_TO_NET_32(currentPeer->mtu);
  3138. command.connect.windowSize = ENET_HOST_TO_NET_32(currentPeer->windowSize);
  3139. command.connect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  3140. command.connect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  3141. command.connect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3142. command.connect.packetThrottleInterval = ENET_HOST_TO_NET_32(currentPeer->packetThrottleInterval);
  3143. command.connect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleAcceleration);
  3144. command.connect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleDeceleration);
  3145. command.connect.connectID = currentPeer->connectID;
  3146. command.connect.data = ENET_HOST_TO_NET_32(data);
  3147. enet_peer_queue_outgoing_command(currentPeer, &command, NULL, 0, 0);
  3148. return currentPeer;
  3149. }
  3150. void enet_host_broadcast(ENetHost* host, enet_uint8 channelID, ENetPacket* packet) {
  3151. ENetPeer* currentPeer;
  3152. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3153. ++packet->referenceCount;
  3154. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3155. if (currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3156. continue;
  3157. enet_peer_send(currentPeer, channelID, packet);
  3158. }
  3159. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3160. --packet->referenceCount;
  3161. if (packet->referenceCount == 0)
  3162. enet_packet_destroy(packet);
  3163. }
  3164. void enet_host_broadcast_exclude(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer* excludedPeer) {
  3165. ENetPeer* currentPeer;
  3166. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3167. ++packet->referenceCount;
  3168. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3169. if (currentPeer->state != ENET_PEER_STATE_CONNECTED || currentPeer == excludedPeer)
  3170. continue;
  3171. enet_peer_send(currentPeer, channelID, packet);
  3172. }
  3173. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3174. --packet->referenceCount;
  3175. if (packet->referenceCount == 0)
  3176. enet_packet_destroy(packet);
  3177. }
  3178. void enet_host_broadcast_selective(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer** peers, size_t length) {
  3179. ENetPeer* currentPeer;
  3180. size_t i;
  3181. if (host == NULL)
  3182. return;
  3183. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3184. ++packet->referenceCount;
  3185. for (i = 0; i < length; i++) {
  3186. currentPeer = peers[i];
  3187. if (currentPeer == NULL || currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3188. continue;
  3189. enet_peer_send(currentPeer, channelID, packet);
  3190. }
  3191. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3192. --packet->referenceCount;
  3193. if (packet->referenceCount == 0)
  3194. enet_packet_destroy(packet);
  3195. }
  3196. void enet_host_channel_limit(ENetHost* host, size_t channelLimit) {
  3197. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3198. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3199. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3200. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3201. host->channelLimit = channelLimit;
  3202. }
  3203. void enet_host_bandwidth_limit(ENetHost* host, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth) {
  3204. host->incomingBandwidth = incomingBandwidth;
  3205. host->outgoingBandwidth = outgoingBandwidth;
  3206. host->recalculateBandwidthLimits = 1;
  3207. }
  3208. void enet_host_bandwidth_throttle(ENetHost* host) {
  3209. enet_uint32 timeCurrent = enet_time_get();
  3210. enet_uint32 elapsedTime = timeCurrent - host->bandwidthThrottleEpoch;
  3211. enet_uint32 peersRemaining = (enet_uint32)host->connectedPeers;
  3212. enet_uint32 dataTotal = ~0;
  3213. enet_uint32 bandwidth = ~0;
  3214. enet_uint32 throttle = 0;
  3215. enet_uint32 bandwidthLimit = 0;
  3216. int needsAdjustment = host->bandwidthLimitedPeers > 0 ? 1 : 0;
  3217. ENetPeer* peer;
  3218. ENetProtocol command;
  3219. if (elapsedTime < ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  3220. return;
  3221. if (host->outgoingBandwidth == 0 && host->incomingBandwidth == 0)
  3222. return;
  3223. host->bandwidthThrottleEpoch = timeCurrent;
  3224. if (peersRemaining == 0)
  3225. return;
  3226. if (host->outgoingBandwidth != 0) {
  3227. dataTotal = 0;
  3228. bandwidth = (host->outgoingBandwidth * elapsedTime) / 1000;
  3229. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3230. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3231. continue;
  3232. dataTotal += peer->outgoingDataTotal;
  3233. }
  3234. }
  3235. while (peersRemaining > 0 && needsAdjustment != 0) {
  3236. needsAdjustment = 0;
  3237. if (dataTotal <= bandwidth)
  3238. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3239. else
  3240. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3241. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3242. enet_uint32 peerBandwidth;
  3243. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidth == 0 || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3244. continue;
  3245. peerBandwidth = (peer->incomingBandwidth * elapsedTime) / 1000;
  3246. if ((throttle * peer->outgoingDataTotal) / ENET_PEER_PACKET_THROTTLE_SCALE <= peerBandwidth)
  3247. continue;
  3248. peer->packetThrottleLimit = (peerBandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / peer->outgoingDataTotal;
  3249. if (peer->packetThrottleLimit == 0)
  3250. peer->packetThrottleLimit = 1;
  3251. if (peer->packetThrottle > peer->packetThrottleLimit)
  3252. peer->packetThrottle = peer->packetThrottleLimit;
  3253. peer->outgoingBandwidthThrottleEpoch = timeCurrent;
  3254. peer->incomingDataTotal = 0;
  3255. peer->outgoingDataTotal = 0;
  3256. needsAdjustment = 1;
  3257. --peersRemaining;
  3258. bandwidth -= peerBandwidth;
  3259. dataTotal -= peerBandwidth;
  3260. }
  3261. }
  3262. if (peersRemaining > 0) {
  3263. if (dataTotal <= bandwidth)
  3264. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3265. else
  3266. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3267. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3268. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3269. continue;
  3270. peer->packetThrottleLimit = throttle;
  3271. if (peer->packetThrottle > peer->packetThrottleLimit)
  3272. peer->packetThrottle = peer->packetThrottleLimit;
  3273. peer->incomingDataTotal = 0;
  3274. peer->outgoingDataTotal = 0;
  3275. }
  3276. }
  3277. if (host->recalculateBandwidthLimits) {
  3278. host->recalculateBandwidthLimits = 0;
  3279. peersRemaining = (enet_uint32)host->connectedPeers;
  3280. bandwidth = host->incomingBandwidth;
  3281. needsAdjustment = 1;
  3282. if (bandwidth == 0) {
  3283. bandwidthLimit = 0;
  3284. } else {
  3285. while (peersRemaining > 0 && needsAdjustment != 0) {
  3286. needsAdjustment = 0;
  3287. bandwidthLimit = bandwidth / peersRemaining;
  3288. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3289. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3290. continue;
  3291. if (peer->outgoingBandwidth > 0 && peer->outgoingBandwidth >= bandwidthLimit)
  3292. continue;
  3293. peer->incomingBandwidthThrottleEpoch = timeCurrent;
  3294. needsAdjustment = 1;
  3295. --peersRemaining;
  3296. bandwidth -= peer->outgoingBandwidth;
  3297. }
  3298. }
  3299. }
  3300. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3301. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3302. continue;
  3303. command.header.command = ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3304. command.header.channelID = 0xFF;
  3305. command.bandwidthLimit.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3306. if (peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3307. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(peer->outgoingBandwidth);
  3308. else
  3309. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(bandwidthLimit);
  3310. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  3311. }
  3312. }
  3313. }
  3314. /*
  3315. =======================================================================
  3316. Address
  3317. =======================================================================
  3318. */
  3319. int enet_address_set_ip(ENetAddress* address, const char* ip) {
  3320. int type = AF_INET6;
  3321. void* destination = &address->ipv6;
  3322. if (strchr(ip, ':') == NULL) {
  3323. type = AF_INET;
  3324. memset(address, 0, sizeof(address->ipv4.zeros));
  3325. address->ipv4.ffff = 0xFFFF;
  3326. destination = &address->ipv4.ip;
  3327. }
  3328. if (!inet_pton(type, ip, destination))
  3329. return -1;
  3330. return 0;
  3331. }
  3332. int enet_address_set_hostname(ENetAddress* address, const char* name) {
  3333. struct addrinfo hints, *resultList = NULL, *result = NULL;
  3334. memset(&hints, 0, sizeof(hints));
  3335. hints.ai_family = AF_UNSPEC;
  3336. if (getaddrinfo(name, NULL, &hints, &resultList) != 0)
  3337. return -1;
  3338. for (result = resultList; result != NULL; result = result->ai_next) {
  3339. if (result->ai_addr != NULL && result->ai_addrlen >= sizeof(struct sockaddr_in)) {
  3340. if (result->ai_family == AF_INET) {
  3341. struct sockaddr_in* sin = (struct sockaddr_in*)result->ai_addr;
  3342. memset(address, 0, sizeof(address->ipv4.zeros));
  3343. address->ipv4.ffff = 0xFFFF;
  3344. address->ipv4.ip.s_addr = sin->sin_addr.s_addr;
  3345. freeaddrinfo(resultList);
  3346. return 0;
  3347. } else if (result->ai_family == AF_INET6) {
  3348. struct sockaddr_in6* sin = (struct sockaddr_in6*)result->ai_addr;
  3349. address->ipv6 = sin->sin6_addr;
  3350. freeaddrinfo(resultList);
  3351. return 0;
  3352. }
  3353. }
  3354. }
  3355. if (resultList != NULL)
  3356. freeaddrinfo(resultList);
  3357. return enet_address_set_ip(address, name);
  3358. }
  3359. int enet_address_get_ip(const ENetAddress* address, char* ip, size_t ipLength) {
  3360. if (inet_ntop(AF_INET6, &address->ipv6, ip, ipLength) == NULL)
  3361. return -1;
  3362. if (enet_array_is_zeroed(address->ipv4.zeros, sizeof(address->ipv4.zeros)) == 0 && address->ipv4.ffff == 0xFFFF)
  3363. enet_string_copy(ip, ip + 7, ipLength);
  3364. return 0;
  3365. }
  3366. int enet_address_get_hostname(const ENetAddress* address, char* name, size_t nameLength) {
  3367. struct sockaddr_in6 sin;
  3368. int err;
  3369. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3370. sin.sin6_family = AF_INET6;
  3371. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3372. sin.sin6_addr = address->ipv6;
  3373. err = getnameinfo((struct sockaddr*)&sin, sizeof(sin), name, nameLength, NULL, 0, NI_NAMEREQD);
  3374. if (!err) {
  3375. if (name != NULL && nameLength > 0 && !memchr(name, '\0', nameLength))
  3376. return -1;
  3377. return 0;
  3378. }
  3379. if (err != EAI_NONAME)
  3380. return -1;
  3381. return enet_address_get_ip(address, name, nameLength);
  3382. }
  3383. /*
  3384. =======================================================================
  3385. Platform-specific (Unix)
  3386. =======================================================================
  3387. */
  3388. #ifndef _WIN32
  3389. int enet_initialize(void) {
  3390. return 0;
  3391. }
  3392. void enet_deinitialize(void) { }
  3393. enet_uint64 enet_host_random_seed(void) {
  3394. struct timeval timeVal;
  3395. gettimeofday(&timeVal, NULL);
  3396. return (timeVal.tv_sec * 1000) ^ (timeVal.tv_usec / 1000);
  3397. }
  3398. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3399. struct sockaddr_in6 sin;
  3400. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3401. sin.sin6_family = AF_INET6;
  3402. if (address != NULL) {
  3403. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3404. sin.sin6_addr = address->ipv6;
  3405. } else {
  3406. sin.sin6_port = 0;
  3407. sin.sin6_addr = ENET_HOST_ANY;
  3408. }
  3409. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3410. }
  3411. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3412. struct sockaddr_storage sa;
  3413. socklen_t saLength = sizeof(sa);
  3414. if (getsockname(socket, (struct sockaddr*)&sa, &saLength) == -1)
  3415. return -1;
  3416. if (sa.ss_family == AF_INET) {
  3417. struct sockaddr_in* sin = (struct sockaddr_in*)&sa;
  3418. memset(address, 0, sizeof(address->ipv4.zeros));
  3419. address->ipv4.ffff = 0xFFFF;
  3420. address->ipv4.ip = sin->sin_addr;
  3421. address->port = ENET_NET_TO_HOST_16(sin->sin_port);
  3422. } else if (sa.ss_family == AF_INET6) {
  3423. struct sockaddr_in6* sin = (struct sockaddr_in6*)&sa;
  3424. address->ipv6 = sin->sin6_addr;
  3425. address->port = ENET_NET_TO_HOST_16(sin->sin6_port);
  3426. }
  3427. return 0;
  3428. }
  3429. int enet_socket_listen(ENetSocket socket, int backlog) {
  3430. return listen(socket, backlog < 0 ? SOMAXCONN : backlog);
  3431. }
  3432. ENetSocket enet_socket_create(ENetSocketType type) {
  3433. int socketType = (type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM);
  3434. #ifdef SOCK_CLOEXEC
  3435. socketType |= SOCK_CLOEXEC;
  3436. #endif
  3437. return socket(PF_INET6, socketType, 0);
  3438. }
  3439. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3440. int result = -1;
  3441. switch (option) {
  3442. case ENET_SOCKOPT_NONBLOCK:
  3443. result = fcntl(socket, F_SETFL, (value ? O_NONBLOCK : 0) | (fcntl(socket, F_GETFL) & ~O_NONBLOCK));
  3444. break;
  3445. case ENET_SOCKOPT_BROADCAST:
  3446. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3447. break;
  3448. case ENET_SOCKOPT_REUSEADDR:
  3449. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3450. break;
  3451. case ENET_SOCKOPT_RCVBUF:
  3452. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3453. break;
  3454. case ENET_SOCKOPT_SNDBUF:
  3455. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3456. break;
  3457. case ENET_SOCKOPT_RCVTIMEO: {
  3458. struct timeval timeVal;
  3459. timeVal.tv_sec = value / 1000;
  3460. timeVal.tv_usec = (value % 1000) * 1000;
  3461. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3462. break;
  3463. }
  3464. case ENET_SOCKOPT_SNDTIMEO: {
  3465. struct timeval timeVal;
  3466. timeVal.tv_sec = value / 1000;
  3467. timeVal.tv_usec = (value % 1000) * 1000;
  3468. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3469. break;
  3470. }
  3471. case ENET_SOCKOPT_NODELAY:
  3472. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3473. break;
  3474. case ENET_SOCKOPT_IPV6_V6ONLY:
  3475. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3476. break;
  3477. default:
  3478. break;
  3479. }
  3480. return result == -1 ? -1 : 0;
  3481. }
  3482. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3483. int result = -1;
  3484. socklen_t len;
  3485. switch (option) {
  3486. case ENET_SOCKOPT_ERROR:
  3487. len = sizeof(int);
  3488. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, value, &len);
  3489. break;
  3490. default:
  3491. break;
  3492. }
  3493. return result == -1 ? -1 : 0;
  3494. }
  3495. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3496. int result = -1;
  3497. struct sockaddr_in6 sin;
  3498. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3499. sin.sin6_family = AF_INET6;
  3500. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3501. sin.sin6_addr = address->ipv6;
  3502. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3503. if (result == -1 && errno == EINPROGRESS)
  3504. return 0;
  3505. return result;
  3506. }
  3507. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3508. int result = -1;
  3509. struct sockaddr_in6 sin;
  3510. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3511. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3512. if (result == -1)
  3513. return ENET_SOCKET_NULL;
  3514. if (address != NULL) {
  3515. address->ipv6 = sin.sin6_addr;
  3516. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3517. }
  3518. return result;
  3519. }
  3520. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3521. return shutdown(socket, (int)how);
  3522. }
  3523. void enet_socket_destroy(ENetSocket socket) {
  3524. if (socket != ENET_SOCKET_NULL)
  3525. close(socket);
  3526. }
  3527. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3528. struct msghdr msgHdr;
  3529. struct sockaddr_in6 sin;
  3530. int sentLength;
  3531. memset(&msgHdr, 0, sizeof(struct msghdr));
  3532. if (address != NULL) {
  3533. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3534. sin.sin6_family = AF_INET6;
  3535. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3536. sin.sin6_addr = address->ipv6;
  3537. msgHdr.msg_name = &sin;
  3538. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3539. }
  3540. msgHdr.msg_iov = (struct iovec*)buffers;
  3541. msgHdr.msg_iovlen = bufferCount;
  3542. sentLength = sendmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3543. if (sentLength == -1) {
  3544. if (errno == EWOULDBLOCK)
  3545. return 0;
  3546. return -1;
  3547. }
  3548. return sentLength;
  3549. }
  3550. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3551. struct msghdr msgHdr;
  3552. struct sockaddr_in6 sin;
  3553. int recvLength;
  3554. memset(&msgHdr, 0, sizeof(struct msghdr));
  3555. if (address != NULL) {
  3556. msgHdr.msg_name = &sin;
  3557. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3558. }
  3559. msgHdr.msg_iov = (struct iovec*)buffers;
  3560. msgHdr.msg_iovlen = bufferCount;
  3561. recvLength = recvmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3562. if (recvLength == -1) {
  3563. if (errno == EWOULDBLOCK)
  3564. return 0;
  3565. return -1;
  3566. }
  3567. if (msgHdr.msg_flags & MSG_TRUNC)
  3568. return -1;
  3569. if (address != NULL) {
  3570. address->ipv6 = sin.sin6_addr;
  3571. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3572. }
  3573. return recvLength;
  3574. }
  3575. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3576. struct timeval timeVal;
  3577. timeVal.tv_sec = timeout / 1000;
  3578. timeVal.tv_usec = (timeout % 1000) * 1000;
  3579. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3580. }
  3581. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3582. struct pollfd pollSocket;
  3583. int pollCount;
  3584. pollSocket.fd = socket;
  3585. pollSocket.events = 0;
  3586. if (*condition & ENET_SOCKET_WAIT_SEND)
  3587. pollSocket.events |= POLLOUT;
  3588. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3589. pollSocket.events |= POLLIN;
  3590. pollCount = poll(&pollSocket, 1, timeout);
  3591. if (pollCount < 0) {
  3592. if (errno == EINTR && *condition & ENET_SOCKET_WAIT_INTERRUPT) {
  3593. *condition = ENET_SOCKET_WAIT_INTERRUPT;
  3594. return 0;
  3595. }
  3596. return -1;
  3597. }
  3598. *condition = ENET_SOCKET_WAIT_NONE;
  3599. if (pollCount == 0)
  3600. return 0;
  3601. if (pollSocket.revents & POLLOUT)
  3602. *condition |= ENET_SOCKET_WAIT_SEND;
  3603. if (pollSocket.revents & POLLIN)
  3604. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3605. return 0;
  3606. }
  3607. #endif
  3608. /*
  3609. =======================================================================
  3610. Platform-specific (Windows)
  3611. =======================================================================
  3612. */
  3613. #ifdef _WIN32
  3614. int enet_initialize(void) {
  3615. WORD versionRequested = MAKEWORD(2, 2);
  3616. WSADATA wsaData;
  3617. if (WSAStartup(versionRequested, &wsaData))
  3618. return -1;
  3619. if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
  3620. WSACleanup();
  3621. return -1;
  3622. }
  3623. timeBeginPeriod(1);
  3624. return 0;
  3625. }
  3626. void enet_deinitialize(void) {
  3627. timeEndPeriod(1);
  3628. WSACleanup();
  3629. }
  3630. enet_uint64 enet_host_random_seed(void) {
  3631. return (enet_uint64)timeGetTime();
  3632. }
  3633. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3634. struct sockaddr_in6 sin;
  3635. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3636. sin.sin6_family = AF_INET6;
  3637. if (address != NULL) {
  3638. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3639. sin.sin6_addr = address->ipv6;
  3640. } else {
  3641. sin.sin6_port = 0;
  3642. sin.sin6_addr = in6addr_any;
  3643. }
  3644. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)) == SOCKET_ERROR ? -1 : 0;
  3645. }
  3646. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3647. struct sockaddr_storage sa;
  3648. int saLength = sizeof(sa);
  3649. if (getsockname(socket, (struct sockaddr*)&sa, &saLength) == -1)
  3650. return -1;
  3651. if (sa.ss_family == AF_INET) {
  3652. struct sockaddr_in* sin = (struct sockaddr_in*)&sa;
  3653. memset(address, 0, sizeof(address->ipv4.zeros));
  3654. address->ipv4.ffff = 0xFFFF;
  3655. address->ipv4.ip = sin->sin_addr;
  3656. address->port = ENET_NET_TO_HOST_16(sin->sin_port);
  3657. } else if (sa.ss_family == AF_INET6) {
  3658. struct sockaddr_in6* sin = (struct sockaddr_in6*)&sa;
  3659. address->ipv6 = sin->sin6_addr;
  3660. address->port = ENET_NET_TO_HOST_16(sin->sin6_port);
  3661. }
  3662. return 0;
  3663. }
  3664. int enet_socket_listen(ENetSocket socket, int backlog) {
  3665. return listen(socket, backlog < 0 ? SOMAXCONN : backlog) == SOCKET_ERROR ? -1 : 0;
  3666. }
  3667. ENetSocket enet_socket_create(ENetSocketType type) {
  3668. return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
  3669. }
  3670. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3671. int result = SOCKET_ERROR;
  3672. switch (option) {
  3673. case ENET_SOCKOPT_NONBLOCK: {
  3674. u_long nonBlocking = (u_long)value;
  3675. result = ioctlsocket(socket, FIONBIO, &nonBlocking);
  3676. break;
  3677. }
  3678. case ENET_SOCKOPT_BROADCAST:
  3679. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3680. break;
  3681. case ENET_SOCKOPT_REUSEADDR:
  3682. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3683. break;
  3684. case ENET_SOCKOPT_RCVBUF:
  3685. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3686. break;
  3687. case ENET_SOCKOPT_SNDBUF:
  3688. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3689. break;
  3690. case ENET_SOCKOPT_RCVTIMEO:
  3691. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&value, sizeof(int));
  3692. break;
  3693. case ENET_SOCKOPT_SNDTIMEO:
  3694. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&value, sizeof(int));
  3695. break;
  3696. case ENET_SOCKOPT_NODELAY:
  3697. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3698. break;
  3699. case ENET_SOCKOPT_IPV6_V6ONLY:
  3700. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3701. break;
  3702. default:
  3703. break;
  3704. }
  3705. return result == SOCKET_ERROR ? -1 : 0;
  3706. }
  3707. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3708. int result = SOCKET_ERROR, len;
  3709. switch (option) {
  3710. case ENET_SOCKOPT_ERROR:
  3711. len = sizeof(int);
  3712. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, (char*)value, &len);
  3713. break;
  3714. default:
  3715. break;
  3716. }
  3717. return result == SOCKET_ERROR ? -1 : 0;
  3718. }
  3719. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3720. int result = -1;
  3721. struct sockaddr_in6 sin;
  3722. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3723. sin.sin6_family = AF_INET6;
  3724. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3725. sin.sin6_addr = address->ipv6;
  3726. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3727. if (result == SOCKET_ERROR && WSAGetLastError() != WSAEWOULDBLOCK)
  3728. return -1;
  3729. return 0;
  3730. }
  3731. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3732. SOCKET result;
  3733. struct sockaddr_in6 sin;
  3734. int sinLength = sizeof(struct sockaddr_in6);
  3735. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3736. if (result == INVALID_SOCKET)
  3737. return ENET_SOCKET_NULL;
  3738. if (address != NULL) {
  3739. address->ipv6 = sin.sin6_addr;
  3740. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3741. }
  3742. return result;
  3743. }
  3744. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3745. return shutdown(socket, (int)how) == SOCKET_ERROR ? -1 : 0;
  3746. }
  3747. void enet_socket_destroy(ENetSocket socket) {
  3748. if (socket != INVALID_SOCKET)
  3749. closesocket(socket);
  3750. }
  3751. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3752. struct sockaddr_in6 sin;
  3753. DWORD sentLength;
  3754. if (address != NULL) {
  3755. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3756. sin.sin6_family = AF_INET6;
  3757. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3758. sin.sin6_addr = address->ipv6;
  3759. }
  3760. 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)
  3761. return (WSAGetLastError() == WSAEWOULDBLOCK) ? 0 : -1;
  3762. return (int)sentLength;
  3763. }
  3764. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3765. INT sinLength = sizeof(struct sockaddr_in6);
  3766. DWORD flags = 0, recvLength;
  3767. struct sockaddr_in6 sin;
  3768. if (WSARecvFrom(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &recvLength, &flags, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL, NULL, NULL) == SOCKET_ERROR) {
  3769. switch (WSAGetLastError()) {
  3770. case WSAEWOULDBLOCK:
  3771. case WSAECONNRESET:
  3772. return 0;
  3773. }
  3774. return -1;
  3775. }
  3776. if (flags & MSG_PARTIAL)
  3777. return -1;
  3778. if (address != NULL) {
  3779. address->ipv6 = sin.sin6_addr;
  3780. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3781. }
  3782. return (int)recvLength;
  3783. }
  3784. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3785. struct timeval timeVal;
  3786. timeVal.tv_sec = timeout / 1000;
  3787. timeVal.tv_usec = (timeout % 1000) * 1000;
  3788. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3789. }
  3790. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3791. fd_set readSet, writeSet;
  3792. struct timeval timeVal;
  3793. int selectCount;
  3794. timeVal.tv_sec = timeout / 1000;
  3795. timeVal.tv_usec = (timeout % 1000) * 1000;
  3796. FD_ZERO(&readSet);
  3797. FD_ZERO(&writeSet);
  3798. if (*condition & ENET_SOCKET_WAIT_SEND)
  3799. FD_SET(socket, &writeSet);
  3800. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3801. FD_SET(socket, &readSet);
  3802. selectCount = select(socket + 1, &readSet, &writeSet, NULL, &timeVal);
  3803. if (selectCount < 0)
  3804. return -1;
  3805. *condition = ENET_SOCKET_WAIT_NONE;
  3806. if (selectCount == 0)
  3807. return 0;
  3808. if (FD_ISSET(socket, &writeSet))
  3809. *condition |= ENET_SOCKET_WAIT_SEND;
  3810. if (FD_ISSET(socket, &readSet))
  3811. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3812. return 0;
  3813. }
  3814. #endif
  3815. /*
  3816. =======================================================================
  3817. Extended functionality
  3818. =======================================================================
  3819. */
  3820. void* enet_packet_get_data(const ENetPacket* packet) {
  3821. return (void*)packet->data;
  3822. }
  3823. int enet_packet_get_length(const ENetPacket* packet) {
  3824. return packet->dataLength;
  3825. }
  3826. void enet_packet_set_free_callback(ENetPacket* packet, const void* callback) {
  3827. packet->freeCallback = (ENetPacketFreeCallback)callback;
  3828. }
  3829. int enet_packet_check_references(const ENetPacket* packet) {
  3830. return (int)packet->referenceCount;
  3831. }
  3832. void enet_packet_dispose(ENetPacket* packet) {
  3833. if (packet->referenceCount == 0)
  3834. enet_packet_destroy(packet);
  3835. }
  3836. enet_uint32 enet_host_get_peers_count(const ENetHost* host) {
  3837. return host->connectedPeers;
  3838. }
  3839. enet_uint32 enet_host_get_packets_sent(const ENetHost* host) {
  3840. return host->totalSentPackets;
  3841. }
  3842. enet_uint32 enet_host_get_packets_received(const ENetHost* host) {
  3843. return host->totalReceivedPackets;
  3844. }
  3845. enet_uint32 enet_host_get_bytes_sent(const ENetHost* host) {
  3846. return host->totalSentData;
  3847. }
  3848. enet_uint32 enet_host_get_bytes_received(const ENetHost* host) {
  3849. return host->totalReceivedData;
  3850. }
  3851. enet_uint32 enet_peer_get_id(const ENetPeer* peer) {
  3852. return peer->incomingPeerID;
  3853. }
  3854. int enet_peer_get_ip(const ENetPeer* peer, char* ip, size_t ipLength) {
  3855. return enet_address_get_ip(&peer->address, ip, ipLength);
  3856. }
  3857. enet_uint16 enet_peer_get_port(const ENetPeer* peer) {
  3858. return peer->address.port;
  3859. }
  3860. enet_uint32 enet_peer_get_mtu(const ENetPeer* peer) {
  3861. return peer->mtu;
  3862. }
  3863. ENetPeerState enet_peer_get_state(const ENetPeer* peer) {
  3864. return peer->state;
  3865. }
  3866. enet_uint32 enet_peer_get_rtt(const ENetPeer* peer) {
  3867. return peer->smoothedRoundTripTime;
  3868. }
  3869. enet_uint32 enet_peer_get_lastsendtime(const ENetPeer* peer) {
  3870. return peer->lastSendTime;
  3871. }
  3872. enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer* peer) {
  3873. return peer->lastReceiveTime;
  3874. }
  3875. enet_uint64 enet_peer_get_packets_sent(const ENetPeer* peer) {
  3876. return peer->totalPacketsSent;
  3877. }
  3878. enet_uint64 enet_peer_get_packets_lost(const ENetPeer* peer) {
  3879. return peer->totalPacketsLost;
  3880. }
  3881. enet_uint64 enet_peer_get_bytes_sent(const ENetPeer* peer) {
  3882. return peer->totalDataSent;
  3883. }
  3884. enet_uint64 enet_peer_get_bytes_received(const ENetPeer* peer) {
  3885. return peer->totalDataReceived;
  3886. }
  3887. void* enet_peer_get_data(const ENetPeer* peer) {
  3888. return (void*)peer->data;
  3889. }
  3890. void enet_peer_set_data(ENetPeer* peer, const void* data) {
  3891. peer->data = (enet_uint32*)data;
  3892. }
  3893. #ifdef _MSC_VER
  3894. #pragma warning(pop)
  3895. #endif
  3896. #endif // ENET_IMPLEMENTATION
  3897. #endif // ENET_H