enet.h 174 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 1
  32. #define ENET_VERSION_CREATE(major, minor, patch) (((major) << 16) | ((minor) << 8) | (patch))
  33. #define ENET_VERSION_GET_MAJOR(version) (((version) >> 16) & 0xFF)
  34. #define ENET_VERSION_GET_MINOR(version) (((version) >> 8) & 0xFF)
  35. #define ENET_VERSION_GET_PATCH(version) ((version) & 0xFF)
  36. #define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH)
  37. #define ENET_TIME_OVERFLOW 86400000
  38. #define ENET_TIME_LESS(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW)
  39. #define ENET_TIME_GREATER(a, b) ((b) - (a) >= ENET_TIME_OVERFLOW)
  40. #define ENET_TIME_LESS_EQUAL(a, b) (!ENET_TIME_GREATER(a, b))
  41. #define ENET_TIME_GREATER_EQUAL(a, b) (!ENET_TIME_LESS(a, b))
  42. #define ENET_TIME_DIFFERENCE(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW ? (b) - (a) : (a) - (b))
  43. #define ENET_MAX(x, y) ((x) > (y) ? (x) : (y))
  44. #define ENET_MIN(x, y) ((x) < (y) ? (x) : (y))
  45. #define ENET_SRTT_INITIAL 1.0
  46. #define ENET_SRTT_PARA_G 0.125
  47. /*
  48. =======================================================================
  49. System differences
  50. =======================================================================
  51. */
  52. #ifdef _WIN32
  53. #if defined(_MSC_VER) && defined(ENET_IMPLEMENTATION)
  54. #pragma warning(disable: 4244) /* 64-bit to 32-bit integer conversion */
  55. #pragma warning(disable: 4267) /* size_t to integer conversion */
  56. #endif
  57. #ifndef ENET_NO_PRAGMA_LINK
  58. #pragma comment(lib, "ws2_32.lib")
  59. #pragma comment(lib, "winmm.lib")
  60. #endif
  61. #if _MSC_VER >= 1910
  62. /* It looks like there were changes as of Visual Studio 2017 and there are no 32/64 bit
  63. versions of _InterlockedExchange[operation], only InterlockedExchange[operation]
  64. (without leading underscore), so we have to distinguish between compiler versions */
  65. #define NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  66. #endif
  67. #ifdef __GNUC__
  68. #if (_WIN32_WINNT < 0x0501)
  69. #undef _WIN32_WINNT
  70. #define _WIN32_WINNT 0x0501
  71. #endif
  72. #endif
  73. #include <winsock2.h>
  74. #include <ws2tcpip.h>
  75. #include <mmsystem.h>
  76. #include <intrin.h>
  77. #if defined(_WIN32) && defined(_MSC_VER)
  78. #if _MSC_VER < 1900
  79. typedef struct timespec {
  80. long tv_sec;
  81. long tv_nsec;
  82. };
  83. #endif
  84. #define CLOCK_MONOTONIC 0
  85. #endif
  86. typedef SOCKET ENetSocket;
  87. #define ENET_SOCKET_NULL INVALID_SOCKET
  88. typedef struct {
  89. size_t dataLength;
  90. void* data;
  91. } ENetBuffer;
  92. #define ENET_CALLBACK __cdecl
  93. #ifdef ENET_DLL
  94. #ifdef ENET_IMPLEMENTATION
  95. #define ENET_API __declspec(dllexport)
  96. #else
  97. #define ENET_API __declspec(dllimport)
  98. #endif
  99. #else
  100. #define ENET_API extern
  101. #endif
  102. #else
  103. #include <sys/types.h>
  104. #include <sys/ioctl.h>
  105. #include <sys/time.h>
  106. #include <sys/socket.h>
  107. #include <poll.h>
  108. #include <arpa/inet.h>
  109. #include <netinet/in.h>
  110. #include <netinet/tcp.h>
  111. #include <netdb.h>
  112. #include <unistd.h>
  113. #include <string.h>
  114. #include <errno.h>
  115. #include <fcntl.h>
  116. #ifdef __APPLE__
  117. #include <mach/clock.h>
  118. #include <mach/mach.h>
  119. #include <Availability.h>
  120. #endif
  121. #ifndef MSG_NOSIGNAL
  122. #define MSG_NOSIGNAL 0
  123. #endif
  124. #ifdef MSG_MAXIOVLEN
  125. #define ENET_BUFFER_MAXIMUM MSG_MAXIOVLEN
  126. #endif
  127. typedef int ENetSocket;
  128. #define ENET_SOCKET_NULL -1
  129. typedef struct {
  130. void* data;
  131. size_t dataLength;
  132. } ENetBuffer;
  133. #define ENET_CALLBACK
  134. #define ENET_API extern
  135. #endif
  136. #ifndef ENET_BUFFER_MAXIMUM
  137. #define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS)
  138. #endif
  139. #define ENET_HOST_ANY in6addr_any
  140. #define ENET_PORT_ANY 0
  141. #define ENET_HOST_SIZE 1025
  142. #define ENET_HOST_TO_NET_16(value) (htons(value))
  143. #define ENET_HOST_TO_NET_32(value) (htonl(value))
  144. #define ENET_NET_TO_HOST_16(value) (ntohs(value))
  145. #define ENET_NET_TO_HOST_32(value) (ntohl(value))
  146. #ifdef __cplusplus
  147. extern "C" {
  148. #endif
  149. /*
  150. =======================================================================
  151. Internals
  152. =======================================================================
  153. */
  154. typedef uint8_t enet_uint8;
  155. typedef uint16_t enet_uint16;
  156. typedef uint32_t enet_uint32;
  157. typedef uint64_t enet_uint64;
  158. typedef enet_uint32 ENetVersion;
  159. typedef fd_set ENetSocketSet;
  160. typedef struct _ENetCallbacks {
  161. void* (ENET_CALLBACK *malloc)(size_t size);
  162. void (ENET_CALLBACK *free)(void* memory);
  163. void (ENET_CALLBACK *noMemory)(void);
  164. } ENetCallbacks;
  165. extern void* enet_malloc(size_t);
  166. extern void enet_free(void*);
  167. typedef struct _ENetListNode {
  168. struct _ENetListNode* next;
  169. struct _ENetListNode* previous;
  170. } ENetListNode;
  171. typedef ENetListNode* ENetListIterator;
  172. typedef struct _ENetList {
  173. ENetListNode sentinel;
  174. } ENetList;
  175. extern ENetListIterator enet_list_insert(ENetListIterator, void*);
  176. extern ENetListIterator enet_list_move(ENetListIterator, void*, void*);
  177. extern void* enet_list_remove(ENetListIterator);
  178. extern void enet_list_clear(ENetList*);
  179. extern size_t enet_list_size(ENetList*);
  180. #define enet_list_begin(list) ((list)->sentinel.next)
  181. #define enet_list_end(list) (&(list)->sentinel)
  182. #define enet_list_empty(list) (enet_list_begin(list) == enet_list_end(list))
  183. #define enet_list_next(iterator) ((iterator)->next)
  184. #define enet_list_previous(iterator) ((iterator)->previous)
  185. #define enet_list_front(list) ((void*)(list)->sentinel.next)
  186. #define enet_list_back(list) ((void*)(list)->sentinel.previous)
  187. #ifndef IN4ADDR
  188. #define IN4ADDR
  189. struct in4_addr {
  190. uint8_t zeros[10];
  191. uint16_t ffff;
  192. struct in_addr ip;
  193. };
  194. #endif
  195. #define enet_in6_equal(a, b) (memcmp(&a, &b, sizeof(struct in6_addr)) == 0)
  196. /*
  197. =======================================================================
  198. Protocol
  199. =======================================================================
  200. */
  201. enum {
  202. ENET_PROTOCOL_MINIMUM_MTU = 576,
  203. ENET_PROTOCOL_MAXIMUM_MTU = 4096,
  204. ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS = 32,
  205. ENET_PROTOCOL_MINIMUM_WINDOW_SIZE = 4096,
  206. ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE = 65536,
  207. ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT = 1,
  208. ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT = 255,
  209. ENET_PROTOCOL_MAXIMUM_PEER_ID = 0xFFF,
  210. ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT = 1024 * 1024
  211. };
  212. typedef enum _ENetProtocolCommand {
  213. ENET_PROTOCOL_COMMAND_NONE = 0,
  214. ENET_PROTOCOL_COMMAND_ACKNOWLEDGE = 1,
  215. ENET_PROTOCOL_COMMAND_CONNECT = 2,
  216. ENET_PROTOCOL_COMMAND_VERIFY_CONNECT = 3,
  217. ENET_PROTOCOL_COMMAND_DISCONNECT = 4,
  218. ENET_PROTOCOL_COMMAND_PING = 5,
  219. ENET_PROTOCOL_COMMAND_SEND_RELIABLE = 6,
  220. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE = 7,
  221. ENET_PROTOCOL_COMMAND_SEND_FRAGMENT = 8,
  222. ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED = 9,
  223. ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT = 10,
  224. ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE = 11,
  225. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT = 12,
  226. ENET_PROTOCOL_COMMAND_COUNT = 13,
  227. ENET_PROTOCOL_COMMAND_MASK = 0x0F
  228. } ENetProtocolCommand;
  229. typedef enum _ENetProtocolFlag {
  230. ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE = (1 << 7),
  231. ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED = (1 << 6),
  232. ENET_PROTOCOL_HEADER_FLAG_SENT_TIME = (1 << 14),
  233. ENET_PROTOCOL_HEADER_FLAG_COMPRESSED = (1 << 15),
  234. ENET_PROTOCOL_HEADER_FLAG_MASK = ENET_PROTOCOL_HEADER_FLAG_SENT_TIME | ENET_PROTOCOL_HEADER_FLAG_COMPRESSED,
  235. ENET_PROTOCOL_HEADER_SESSION_MASK = (3 << 12),
  236. ENET_PROTOCOL_HEADER_SESSION_SHIFT = 12
  237. } ENetProtocolFlag;
  238. #ifdef _MSC_VER
  239. #pragma pack(push, 1)
  240. #define ENET_PACKED
  241. #elif defined(__GNUC__) || defined(__clang__)
  242. #define ENET_PACKED __attribute__ ((packed))
  243. #else
  244. #define ENET_PACKED
  245. #endif
  246. typedef struct _ENetProtocolHeader {
  247. enet_uint16 peerID;
  248. enet_uint16 sentTime;
  249. } ENET_PACKED ENetProtocolHeader;
  250. typedef struct _ENetProtocolCommandHeader {
  251. enet_uint8 command;
  252. enet_uint8 channelID;
  253. enet_uint16 reliableSequenceNumber;
  254. } ENET_PACKED ENetProtocolCommandHeader;
  255. typedef struct _ENetProtocolAcknowledge {
  256. ENetProtocolCommandHeader header;
  257. enet_uint16 receivedReliableSequenceNumber;
  258. enet_uint16 receivedSentTime;
  259. } ENET_PACKED ENetProtocolAcknowledge;
  260. typedef struct _ENetProtocolConnect {
  261. ENetProtocolCommandHeader header;
  262. enet_uint16 outgoingPeerID;
  263. enet_uint8 incomingSessionID;
  264. enet_uint8 outgoingSessionID;
  265. enet_uint32 mtu;
  266. enet_uint32 windowSize;
  267. enet_uint32 channelCount;
  268. enet_uint32 incomingBandwidth;
  269. enet_uint32 outgoingBandwidth;
  270. enet_uint32 packetThrottleInterval;
  271. enet_uint32 packetThrottleAcceleration;
  272. enet_uint32 packetThrottleDeceleration;
  273. enet_uint32 connectID;
  274. enet_uint32 data;
  275. } ENET_PACKED ENetProtocolConnect;
  276. typedef struct _ENetProtocolVerifyConnect {
  277. ENetProtocolCommandHeader header;
  278. enet_uint16 outgoingPeerID;
  279. enet_uint8 incomingSessionID;
  280. enet_uint8 outgoingSessionID;
  281. enet_uint32 mtu;
  282. enet_uint32 windowSize;
  283. enet_uint32 channelCount;
  284. enet_uint32 incomingBandwidth;
  285. enet_uint32 outgoingBandwidth;
  286. enet_uint32 packetThrottleInterval;
  287. enet_uint32 packetThrottleAcceleration;
  288. enet_uint32 packetThrottleDeceleration;
  289. enet_uint32 connectID;
  290. } ENET_PACKED ENetProtocolVerifyConnect;
  291. typedef struct _ENetProtocolBandwidthLimit {
  292. ENetProtocolCommandHeader header;
  293. enet_uint32 incomingBandwidth;
  294. enet_uint32 outgoingBandwidth;
  295. } ENET_PACKED ENetProtocolBandwidthLimit;
  296. typedef struct _ENetProtocolThrottleConfigure {
  297. ENetProtocolCommandHeader header;
  298. enet_uint32 packetThrottleInterval;
  299. enet_uint32 packetThrottleAcceleration;
  300. enet_uint32 packetThrottleDeceleration;
  301. } ENET_PACKED ENetProtocolThrottleConfigure;
  302. typedef struct _ENetProtocolDisconnect {
  303. ENetProtocolCommandHeader header;
  304. enet_uint32 data;
  305. } ENET_PACKED ENetProtocolDisconnect;
  306. typedef struct _ENetProtocolPing {
  307. ENetProtocolCommandHeader header;
  308. } ENET_PACKED ENetProtocolPing;
  309. typedef struct _ENetProtocolSendReliable {
  310. ENetProtocolCommandHeader header;
  311. enet_uint16 dataLength;
  312. } ENET_PACKED ENetProtocolSendReliable;
  313. typedef struct _ENetProtocolSendUnreliable {
  314. ENetProtocolCommandHeader header;
  315. enet_uint16 unreliableSequenceNumber;
  316. enet_uint16 dataLength;
  317. } ENET_PACKED ENetProtocolSendUnreliable;
  318. typedef struct _ENetProtocolSendUnsequenced {
  319. ENetProtocolCommandHeader header;
  320. enet_uint16 unsequencedGroup;
  321. enet_uint16 dataLength;
  322. } ENET_PACKED ENetProtocolSendUnsequenced;
  323. typedef struct _ENetProtocolSendFragment {
  324. ENetProtocolCommandHeader header;
  325. enet_uint16 startSequenceNumber;
  326. enet_uint16 dataLength;
  327. enet_uint32 fragmentCount;
  328. enet_uint32 fragmentNumber;
  329. enet_uint32 totalLength;
  330. enet_uint32 fragmentOffset;
  331. } ENET_PACKED ENetProtocolSendFragment;
  332. typedef union _ENetProtocol {
  333. ENetProtocolCommandHeader header;
  334. ENetProtocolAcknowledge acknowledge;
  335. ENetProtocolConnect connect;
  336. ENetProtocolVerifyConnect verifyConnect;
  337. ENetProtocolDisconnect disconnect;
  338. ENetProtocolPing ping;
  339. ENetProtocolSendReliable sendReliable;
  340. ENetProtocolSendUnreliable sendUnreliable;
  341. ENetProtocolSendUnsequenced sendUnsequenced;
  342. ENetProtocolSendFragment sendFragment;
  343. ENetProtocolBandwidthLimit bandwidthLimit;
  344. ENetProtocolThrottleConfigure throttleConfigure;
  345. } ENET_PACKED ENetProtocol;
  346. #ifdef _MSC_VER
  347. #pragma pack(pop)
  348. #endif
  349. /*
  350. =======================================================================
  351. General structs/enums
  352. =======================================================================
  353. */
  354. typedef enum _ENetSocketType {
  355. ENET_SOCKET_TYPE_STREAM = 1,
  356. ENET_SOCKET_TYPE_DATAGRAM = 2
  357. } ENetSocketType;
  358. typedef enum _ENetSocketWait {
  359. ENET_SOCKET_WAIT_NONE = 0,
  360. ENET_SOCKET_WAIT_SEND = (1 << 0),
  361. ENET_SOCKET_WAIT_RECEIVE = (1 << 1),
  362. ENET_SOCKET_WAIT_INTERRUPT = (1 << 2)
  363. } ENetSocketWait;
  364. typedef enum _ENetSocketOption {
  365. ENET_SOCKOPT_NONBLOCK = 1,
  366. ENET_SOCKOPT_BROADCAST = 2,
  367. ENET_SOCKOPT_RCVBUF = 3,
  368. ENET_SOCKOPT_SNDBUF = 4,
  369. ENET_SOCKOPT_REUSEADDR = 5,
  370. ENET_SOCKOPT_RCVTIMEO = 6,
  371. ENET_SOCKOPT_SNDTIMEO = 7,
  372. ENET_SOCKOPT_ERROR = 8,
  373. ENET_SOCKOPT_NODELAY = 9,
  374. ENET_SOCKOPT_IPV6_V6ONLY = 10
  375. } ENetSocketOption;
  376. typedef enum _ENetSocketShutdown {
  377. ENET_SOCKET_SHUTDOWN_READ = 0,
  378. ENET_SOCKET_SHUTDOWN_WRITE = 1,
  379. ENET_SOCKET_SHUTDOWN_READ_WRITE = 2
  380. } ENetSocketShutdown;
  381. typedef struct _ENetAddress {
  382. union {
  383. struct in6_addr ipv6;
  384. struct in4_addr ipv4;
  385. };
  386. uint16_t port;
  387. } ENetAddress;
  388. typedef enum _ENetPacketFlag {
  389. ENET_PACKET_FLAG_NONE = 0,
  390. ENET_PACKET_FLAG_RELIABLE = (1 << 0),
  391. ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1),
  392. ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2),
  393. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED = (1 << 3),
  394. ENET_PACKET_FLAG_INSTANT = (1 << 4),
  395. ENET_PACKET_FLAG_SENT = (1 << 8)
  396. } ENetPacketFlag;
  397. typedef void (ENET_CALLBACK *ENetPacketFreeCallback)(void*);
  398. typedef struct _ENetPacket {
  399. enet_uint32 flags;
  400. enet_uint32 dataLength;
  401. enet_uint8* data;
  402. ENetPacketFreeCallback freeCallback;
  403. enet_uint32 referenceCount;
  404. } ENetPacket;
  405. typedef struct _ENetAcknowledgement {
  406. ENetListNode acknowledgementList;
  407. enet_uint32 sentTime;
  408. ENetProtocol command;
  409. } ENetAcknowledgement;
  410. typedef struct _ENetOutgoingCommand {
  411. ENetListNode outgoingCommandList;
  412. enet_uint16 reliableSequenceNumber;
  413. enet_uint16 unreliableSequenceNumber;
  414. enet_uint32 sentTime;
  415. enet_uint32 roundTripTimeout;
  416. enet_uint32 roundTripTimeoutLimit;
  417. enet_uint32 fragmentOffset;
  418. enet_uint16 fragmentLength;
  419. enet_uint16 sendAttempts;
  420. ENetProtocol command;
  421. ENetPacket* packet;
  422. } ENetOutgoingCommand;
  423. typedef struct _ENetIncomingCommand {
  424. ENetListNode incomingCommandList;
  425. enet_uint16 reliableSequenceNumber;
  426. enet_uint16 unreliableSequenceNumber;
  427. ENetProtocol command;
  428. enet_uint32 fragmentCount;
  429. enet_uint32 fragmentsRemaining;
  430. enet_uint32* fragments;
  431. ENetPacket* packet;
  432. } ENetIncomingCommand;
  433. typedef enum _ENetPeerState {
  434. ENET_PEER_STATE_DISCONNECTED = 0,
  435. ENET_PEER_STATE_CONNECTING = 1,
  436. ENET_PEER_STATE_ACKNOWLEDGING_CONNECT = 2,
  437. ENET_PEER_STATE_CONNECTION_PENDING = 3,
  438. ENET_PEER_STATE_CONNECTION_SUCCEEDED = 4,
  439. ENET_PEER_STATE_CONNECTED = 5,
  440. ENET_PEER_STATE_DISCONNECT_LATER = 6,
  441. ENET_PEER_STATE_DISCONNECTING = 7,
  442. ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT = 8,
  443. ENET_PEER_STATE_ZOMBIE = 9
  444. } ENetPeerState;
  445. enum {
  446. ENET_HOST_BUFFER_SIZE_MIN = 256 * 1024,
  447. ENET_HOST_BUFFER_SIZE_MAX = 1024 * 1024,
  448. ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000,
  449. ENET_HOST_DEFAULT_MTU = 1280,
  450. ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024,
  451. ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
  452. ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 500,
  453. ENET_PEER_DEFAULT_PACKET_THROTTLE = 32,
  454. ENET_PEER_PACKET_THROTTLE_SCALE = 32,
  455. ENET_PEER_PACKET_THROTTLE_COUNTER = 7,
  456. ENET_PEER_PACKET_THROTTLE_ACCELERATION = 2,
  457. ENET_PEER_PACKET_THROTTLE_DECELERATION = 2,
  458. ENET_PEER_PACKET_THROTTLE_INTERVAL = 5000,
  459. ENET_PEER_PACKET_LOSS_SCALE = (1 << 16),
  460. ENET_PEER_PACKET_LOSS_INTERVAL = 10000,
  461. ENET_PEER_WINDOW_SIZE_SCALE = 64 * 1024,
  462. ENET_PEER_TIMEOUT_LIMIT = 32,
  463. ENET_PEER_TIMEOUT_MINIMUM = 5000,
  464. ENET_PEER_TIMEOUT_MAXIMUM = 30000,
  465. ENET_PEER_PING_INTERVAL = 500,
  466. ENET_PEER_UNSEQUENCED_WINDOWS = 64,
  467. ENET_PEER_UNSEQUENCED_WINDOW_SIZE = 1024,
  468. ENET_PEER_FREE_UNSEQUENCED_WINDOWS = 32,
  469. ENET_PEER_RELIABLE_WINDOWS = 16,
  470. ENET_PEER_RELIABLE_WINDOW_SIZE = 0x1000,
  471. ENET_PEER_FREE_RELIABLE_WINDOWS = 8
  472. };
  473. typedef struct _ENetChannel {
  474. enet_uint16 outgoingReliableSequenceNumber;
  475. enet_uint16 outgoingUnreliableSequenceNumber;
  476. enet_uint16 usedReliableWindows;
  477. enet_uint16 reliableWindows[ENET_PEER_RELIABLE_WINDOWS];
  478. enet_uint16 incomingReliableSequenceNumber;
  479. enet_uint16 incomingUnreliableSequenceNumber;
  480. ENetList incomingReliableCommands;
  481. ENetList incomingUnreliableCommands;
  482. } ENetChannel;
  483. typedef struct _ENetPeer {
  484. ENetListNode dispatchList;
  485. struct _ENetHost* host;
  486. enet_uint16 outgoingPeerID;
  487. enet_uint16 incomingPeerID;
  488. enet_uint32 connectID;
  489. enet_uint8 outgoingSessionID;
  490. enet_uint8 incomingSessionID;
  491. ENetAddress address;
  492. void* data;
  493. ENetPeerState state;
  494. ENetChannel* channels;
  495. size_t channelCount;
  496. enet_uint32 incomingBandwidth;
  497. enet_uint32 outgoingBandwidth;
  498. enet_uint32 incomingBandwidthThrottleEpoch;
  499. enet_uint32 outgoingBandwidthThrottleEpoch;
  500. enet_uint32 incomingDataTotal;
  501. enet_uint64 totalDataReceived;
  502. enet_uint32 outgoingDataTotal;
  503. enet_uint64 totalDataSent;
  504. enet_uint32 lastSendTime;
  505. enet_uint32 lastReceiveTime;
  506. enet_uint32 nextTimeout;
  507. enet_uint32 earliestTimeout;
  508. enet_uint32 packetLossEpoch;
  509. enet_uint32 packetsSent;
  510. enet_uint64 totalPacketsSent;
  511. enet_uint32 packetsLost;
  512. enet_uint64 totalPacketsLost;
  513. enet_uint32 packetLoss;
  514. enet_uint32 packetLossVariance;
  515. enet_uint32 packetThrottle;
  516. enet_uint32 packetThrottleThreshold;
  517. enet_uint32 packetThrottleLimit;
  518. enet_uint32 packetThrottleCounter;
  519. enet_uint32 packetThrottleEpoch;
  520. enet_uint32 packetThrottleAcceleration;
  521. enet_uint32 packetThrottleDeceleration;
  522. enet_uint32 packetThrottleInterval;
  523. enet_uint32 pingInterval;
  524. enet_uint32 timeoutLimit;
  525. enet_uint32 timeoutMinimum;
  526. enet_uint32 timeoutMaximum;
  527. enet_uint32 smoothedRoundTripTime;
  528. enet_uint32 lastRoundTripTime;
  529. enet_uint32 lowestRoundTripTime;
  530. enet_uint32 lastRoundTripTimeVariance;
  531. enet_uint32 highestRoundTripTimeVariance;
  532. enet_uint32 roundTripTime;
  533. enet_uint32 roundTripTimeVariance;
  534. enet_uint32 mtu;
  535. enet_uint32 windowSize;
  536. enet_uint32 reliableDataInTransit;
  537. enet_uint16 outgoingReliableSequenceNumber;
  538. ENetList acknowledgements;
  539. ENetList sentReliableCommands;
  540. ENetList sentUnreliableCommands;
  541. ENetList outgoingReliableCommands;
  542. ENetList outgoingUnreliableCommands;
  543. ENetList dispatchedCommands;
  544. int needsDispatch;
  545. enet_uint16 incomingUnsequencedGroup;
  546. enet_uint16 outgoingUnsequencedGroup;
  547. enet_uint32 unsequencedWindow[ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32];
  548. enet_uint32 eventData;
  549. size_t totalWaitingData;
  550. } ENetPeer;
  551. typedef enet_uint32 (ENET_CALLBACK *ENetChecksumCallback)(const ENetBuffer* buffers, size_t bufferCount);
  552. typedef int (ENET_CALLBACK *ENetInterceptCallback)(struct _ENetHost* host, void* event);
  553. typedef struct _ENetHost {
  554. ENetSocket socket;
  555. ENetAddress address;
  556. enet_uint32 incomingBandwidth;
  557. enet_uint32 outgoingBandwidth;
  558. enet_uint32 bandwidthThrottleEpoch;
  559. enet_uint32 mtu;
  560. enet_uint32 randomSeed;
  561. int recalculateBandwidthLimits;
  562. enet_uint8 preventConnections;
  563. ENetPeer* peers;
  564. size_t peerCount;
  565. size_t channelLimit;
  566. enet_uint32 serviceTime;
  567. ENetList dispatchQueue;
  568. int continueSending;
  569. size_t packetSize;
  570. enet_uint16 headerFlags;
  571. enet_uint32 totalSentData;
  572. enet_uint32 totalSentPackets;
  573. enet_uint32 totalReceivedData;
  574. enet_uint32 totalReceivedPackets;
  575. ENetProtocol commands[ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
  576. size_t commandCount;
  577. ENetBuffer buffers[ENET_BUFFER_MAXIMUM];
  578. size_t bufferCount;
  579. enet_uint8 compression;
  580. char* compressionBuffer;
  581. size_t compressionBufferSize;
  582. ENetChecksumCallback checksumCallback;
  583. enet_uint8 packetData[2][ENET_PROTOCOL_MAXIMUM_MTU];
  584. ENetAddress receivedAddress;
  585. enet_uint8* receivedData;
  586. size_t receivedDataLength;
  587. ENetInterceptCallback interceptCallback;
  588. size_t connectedPeers;
  589. size_t bandwidthLimitedPeers;
  590. size_t duplicatePeers;
  591. size_t maximumPacketSize;
  592. size_t maximumWaitingData;
  593. } ENetHost;
  594. typedef enum _ENetEventType {
  595. ENET_EVENT_TYPE_NONE = 0,
  596. ENET_EVENT_TYPE_CONNECT = 1,
  597. ENET_EVENT_TYPE_DISCONNECT = 2,
  598. ENET_EVENT_TYPE_RECEIVE = 3,
  599. ENET_EVENT_TYPE_DISCONNECT_TIMEOUT = 4
  600. } ENetEventType;
  601. typedef struct _ENetEvent {
  602. ENetEventType type;
  603. ENetPeer* peer;
  604. enet_uint8 channelID;
  605. enet_uint32 data;
  606. ENetPacket* packet;
  607. } ENetEvent;
  608. /*
  609. =======================================================================
  610. Public API
  611. =======================================================================
  612. */
  613. ENET_API int enet_initialize(void);
  614. ENET_API int enet_initialize_with_callbacks(ENetVersion, const ENetCallbacks*);
  615. ENET_API void enet_deinitialize(void);
  616. ENET_API ENetVersion enet_linked_version(void);
  617. ENET_API int enet_array_is_zeroed(const uint8_t*, int);
  618. ENET_API size_t enet_string_copy(char*, const char*, size_t);
  619. ENET_API enet_uint32 enet_time_get(void);
  620. ENET_API enet_uint32 enet_crc32(const ENetBuffer*, size_t);
  621. ENET_API ENetPacket* enet_packet_create(const void*, size_t, enet_uint32);
  622. ENET_API ENetPacket* enet_packet_create_offset(const void*, size_t, size_t, enet_uint32);
  623. ENET_API void enet_packet_destroy(ENetPacket*);
  624. ENET_API int enet_peer_send(ENetPeer*, enet_uint8, ENetPacket*);
  625. ENET_API ENetPacket* enet_peer_receive(ENetPeer*, enet_uint8*);
  626. ENET_API void enet_peer_ping(ENetPeer*);
  627. ENET_API void enet_peer_ping_interval(ENetPeer*, enet_uint32);
  628. ENET_API void enet_peer_timeout(ENetPeer*, enet_uint32, enet_uint32, enet_uint32);
  629. ENET_API void enet_peer_reset(ENetPeer*);
  630. ENET_API void enet_peer_disconnect(ENetPeer*, enet_uint32);
  631. ENET_API void enet_peer_disconnect_now(ENetPeer*, enet_uint32);
  632. ENET_API void enet_peer_disconnect_later(ENetPeer*, enet_uint32);
  633. ENET_API void enet_peer_throttle_configure(ENetPeer*, enet_uint32, enet_uint32, enet_uint32, enet_uint32);
  634. ENET_API ENetHost* enet_host_create(const ENetAddress*, size_t, size_t, enet_uint32, enet_uint32, int);
  635. ENET_API void enet_host_destroy(ENetHost*);
  636. ENET_API void enet_host_enable_compression(ENetHost*);
  637. ENET_API void enet_host_prevent_connections(ENetHost*, enet_uint8);
  638. ENET_API ENetPeer* enet_host_connect(ENetHost*, const ENetAddress*, size_t, enet_uint32);
  639. ENET_API int enet_host_check_events(ENetHost*, ENetEvent*);
  640. ENET_API int enet_host_service(ENetHost*, ENetEvent*, enet_uint32);
  641. ENET_API void enet_host_flush(ENetHost*);
  642. ENET_API void enet_host_broadcast(ENetHost*, enet_uint8, ENetPacket*);
  643. ENET_API void enet_host_broadcast_exclude(ENetHost*, enet_uint8, ENetPacket*, ENetPeer*);
  644. ENET_API void enet_host_broadcast_selective(ENetHost*, enet_uint8, ENetPacket*, ENetPeer**, size_t);
  645. ENET_API void enet_host_channel_limit(ENetHost*, size_t);
  646. ENET_API void enet_host_bandwidth_limit(ENetHost*, enet_uint32, enet_uint32);
  647. ENET_API int enet_address_set_ip(ENetAddress*, const char*);
  648. ENET_API int enet_address_set_hostname(ENetAddress*, const char*);
  649. ENET_API int enet_address_get_ip(const ENetAddress*, char*, size_t);
  650. ENET_API int enet_address_get_hostname(const ENetAddress*, char*, size_t);
  651. ENET_API ENetSocket enet_socket_create(ENetSocketType);
  652. ENET_API int enet_socket_bind(ENetSocket, const ENetAddress*);
  653. ENET_API int enet_socket_get_address(ENetSocket, ENetAddress*);
  654. ENET_API int enet_socket_listen(ENetSocket, int);
  655. ENET_API ENetSocket enet_socket_accept(ENetSocket, ENetAddress*);
  656. ENET_API int enet_socket_connect(ENetSocket, const ENetAddress*);
  657. ENET_API int enet_socket_send(ENetSocket, const ENetAddress*, const ENetBuffer*, size_t);
  658. ENET_API int enet_socket_receive(ENetSocket, ENetAddress*, ENetBuffer*, size_t);
  659. ENET_API int enet_socket_wait(ENetSocket, enet_uint32*, enet_uint64);
  660. ENET_API int enet_socket_set_option(ENetSocket, ENetSocketOption, int);
  661. ENET_API int enet_socket_get_option(ENetSocket, ENetSocketOption, int*);
  662. ENET_API int enet_socket_shutdown(ENetSocket, ENetSocketShutdown);
  663. ENET_API void enet_socket_destroy(ENetSocket);
  664. ENET_API int enet_socket_set_select(ENetSocket, ENetSocketSet*, ENetSocketSet*, enet_uint32);
  665. /* Extended API for easier binding in other programming languages */
  666. ENET_API void* enet_packet_get_data(const ENetPacket*);
  667. ENET_API int enet_packet_get_length(const ENetPacket*);
  668. ENET_API void enet_packet_set_free_callback(ENetPacket*, const void*);
  669. ENET_API int enet_packet_check_references(const ENetPacket*);
  670. ENET_API void enet_packet_dispose(ENetPacket*);
  671. ENET_API enet_uint32 enet_host_get_peers_count(const ENetHost*);
  672. ENET_API enet_uint32 enet_host_get_packets_sent(const ENetHost*);
  673. ENET_API enet_uint32 enet_host_get_packets_received(const ENetHost*);
  674. ENET_API enet_uint32 enet_host_get_bytes_sent(const ENetHost*);
  675. ENET_API enet_uint32 enet_host_get_bytes_received(const ENetHost*);
  676. ENET_API enet_uint32 enet_peer_get_id(const ENetPeer*);
  677. ENET_API int enet_peer_get_ip(const ENetPeer*, char*, size_t);
  678. ENET_API enet_uint16 enet_peer_get_port(const ENetPeer*);
  679. ENET_API enet_uint32 enet_peer_get_mtu(const ENetPeer*);
  680. ENET_API ENetPeerState enet_peer_get_state(const ENetPeer*);
  681. ENET_API enet_uint32 enet_peer_get_rtt(const ENetPeer*);
  682. ENET_API enet_uint32 enet_peer_get_lastsendtime(const ENetPeer*);
  683. ENET_API enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer*);
  684. ENET_API enet_uint64 enet_peer_get_packets_sent(const ENetPeer*);
  685. ENET_API enet_uint64 enet_peer_get_packets_lost(const ENetPeer*);
  686. ENET_API enet_uint64 enet_peer_get_bytes_sent(const ENetPeer*);
  687. ENET_API enet_uint64 enet_peer_get_bytes_received(const ENetPeer*);
  688. ENET_API void* enet_peer_get_data(const ENetPeer*);
  689. ENET_API void enet_peer_set_data(ENetPeer*, const void*);
  690. /*
  691. =======================================================================
  692. Private API
  693. =======================================================================
  694. */
  695. extern void enet_host_bandwidth_throttle(ENetHost*);
  696. extern enet_uint64 enet_host_random_seed(void);
  697. extern int enet_peer_throttle(ENetPeer*, enet_uint32);
  698. extern void enet_peer_reset_queues(ENetPeer*);
  699. extern void enet_peer_setup_outgoing_command(ENetPeer*, ENetOutgoingCommand*);
  700. extern ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer*, const ENetProtocol*, ENetPacket*, enet_uint32, enet_uint16);
  701. extern ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer*, const ENetProtocol*, const void*, size_t, enet_uint32, enet_uint32);
  702. extern ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer*, const ENetProtocol*, enet_uint16);
  703. extern void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer*, ENetChannel*);
  704. extern void enet_peer_dispatch_incoming_reliable_commands(ENetPeer*, ENetChannel*);
  705. extern void enet_peer_on_connect(ENetPeer*);
  706. extern void enet_peer_on_disconnect(ENetPeer*);
  707. extern size_t enet_protocol_command_size(enet_uint8);
  708. #ifdef __cplusplus
  709. }
  710. #endif
  711. #if defined(ENET_IMPLEMENTATION) && !defined(ENET_IMPLEMENTATION_DONE)
  712. #define ENET_IMPLEMENTATION_DONE 1
  713. #ifdef ENET_LZ4
  714. #include "lz4/lz4.h"
  715. #endif
  716. #ifdef __MINGW32__
  717. #include "mingw/inet_ntop.c"
  718. #include "mingw/inet_pton.c"
  719. #endif
  720. /*
  721. =======================================================================
  722. Atomics
  723. =======================================================================
  724. */
  725. #ifdef _MSC_VER
  726. #define ENET_AT_CASSERT_PRED(predicate) sizeof(char[2 * !!(predicate) - 1])
  727. #define ENET_IS_SUPPORTED_ATOMIC(size) ENET_AT_CASSERT_PRED(size == 1 || size == 2 || size == 4 || size == 8)
  728. #define ENET_ATOMIC_SIZEOF(variable) (ENET_IS_SUPPORTED_ATOMIC(sizeof(*(variable))), sizeof(*(variable)))
  729. __inline int64_t enet_at_atomic_read(char* ptr, size_t size) {
  730. switch (size) {
  731. case 1:
  732. return _InterlockedExchangeAdd8((volatile char*)ptr, 0);
  733. case 2:
  734. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, 0);
  735. case 4:
  736. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  737. return InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  738. #else
  739. return _InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  740. #endif
  741. case 8:
  742. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  743. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  744. #else
  745. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  746. #endif
  747. default:
  748. return 0x0;
  749. }
  750. }
  751. __inline int64_t enet_at_atomic_write(char* ptr, int64_t value, size_t size) {
  752. switch (size) {
  753. case 1:
  754. return _InterlockedExchange8((volatile char*)ptr, (char)value);
  755. case 2:
  756. return _InterlockedExchange16((volatile SHORT*)ptr, (SHORT)value);
  757. case 4:
  758. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  759. return InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  760. #else
  761. return _InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  762. #endif
  763. case 8:
  764. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  765. return InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  766. #else
  767. return _InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  768. #endif
  769. default:
  770. return 0x0;
  771. }
  772. }
  773. __inline int64_t enet_at_atomic_cas(char* ptr, int64_t new_val, int64_t old_val, size_t size) {
  774. switch (size) {
  775. case 1:
  776. return _InterlockedCompareExchange8((volatile char*)ptr, (char)new_val, (char)old_val);
  777. case 2:
  778. return _InterlockedCompareExchange16((volatile SHORT*)ptr, (SHORT)new_val, (SHORT)old_val);
  779. case 4:
  780. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  781. return InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  782. #else
  783. return _InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  784. #endif
  785. case 8:
  786. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  787. return InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  788. #else
  789. return _InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  790. #endif
  791. default:
  792. return 0x0;
  793. }
  794. }
  795. __inline int64_t enet_at_atomic_inc(char* ptr, int64_t delta, size_t data_size) {
  796. switch (data_size) {
  797. case 1:
  798. return _InterlockedExchangeAdd8((volatile char*)ptr, (char)delta);
  799. case 2:
  800. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, (SHORT)delta);
  801. case 4:
  802. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  803. return InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  804. #else
  805. return _InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  806. #endif
  807. case 8:
  808. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  809. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  810. #else
  811. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  812. #endif
  813. default:
  814. return 0x0;
  815. }
  816. }
  817. #define ENET_ATOMIC_READ(variable) enet_at_atomic_read((char*)(variable), ENET_ATOMIC_SIZEOF(variable))
  818. #define ENET_ATOMIC_WRITE(variable, new_val) enet_at_atomic_write((char*)(variable), (int64_t)(new_val), ENET_ATOMIC_SIZEOF(variable))
  819. #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))
  820. #define ENET_ATOMIC_INC(variable) enet_at_atomic_inc((char*)(variable), 1, ENET_ATOMIC_SIZEOF(variable))
  821. #define ENET_ATOMIC_DEC(variable) enet_at_atomic_inc((char*)(variable), -1, ENET_ATOMIC_SIZEOF(variable))
  822. #define ENET_ATOMIC_INC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), (delta), ENET_ATOMIC_SIZEOF(variable))
  823. #define ENET_ATOMIC_DEC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), -(delta), ENET_ATOMIC_SIZEOF(variable))
  824. #elif defined(__GNUC__) || defined(__clang__)
  825. #if defined(__clang__) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
  826. #define AT_HAVE_ATOMICS
  827. #endif
  828. /* We want to use __atomic built-ins if possible because the __sync primitives are
  829. deprecated, because the __atomic build-ins allow us to use ENET_ATOMIC_WRITE on
  830. uninitialized memory without running into undefined behavior, and because the
  831. __atomic versions generate more efficient code since we don't need to rely on
  832. CAS when we don't actually want it.
  833. Note that we use acquire-release memory order (like mutexes do). We could use
  834. sequentially consistent memory order but that has lower performance and is
  835. almost always unneeded. */
  836. #ifdef AT_HAVE_ATOMICS
  837. #define ENET_ATOMIC_READ(ptr) __atomic_load_n((ptr), __ATOMIC_ACQUIRE)
  838. #define ENET_ATOMIC_WRITE(ptr, value) __atomic_store_n((ptr), (value), __ATOMIC_RELEASE)
  839. #ifndef typeof
  840. #define typeof __typeof__
  841. #endif
  842. /* clang_analyzer doesn't know that CAS writes to memory so it complains about
  843. potentially lost data. Replace the code with the equivalent non-sync code. */
  844. #ifdef __clang_analyzer__
  845. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  846. ({ \
  847. typeof(*(ptr)) ENET_ATOMIC_CAS_old_actual_ = (*(ptr)); \
  848. if (ATOMIC_CAS_old_actual_ == (old_value)) \
  849. *(ptr) = new_value; \
  850. ENET_ATOMIC_CAS_old_actual_; \
  851. })
  852. #else
  853. /* Could use __auto_type instead of typeof but that shouldn't work in C++.
  854. The ({ }) syntax is a GCC extension called statement expression. It lets
  855. us return a value out of the macro.
  856. TODO We should return bool here instead of the old value to avoid the ABA
  857. problem. */
  858. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  859. ({ \
  860. typeof(*(ptr)) ENET_ATOMIC_CAS_expected_ = (old_value); \
  861. __atomic_compare_exchange_n((ptr), &ENET_ATOMIC_CAS_expected_, (new_value), false, \
  862. __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE); \
  863. ENET_ATOMIC_CAS_expected_; \
  864. })
  865. #endif
  866. #define ENET_ATOMIC_INC(ptr) __atomic_fetch_add((ptr), 1, __ATOMIC_ACQ_REL)
  867. #define ENET_ATOMIC_DEC(ptr) __atomic_fetch_sub((ptr), 1, __ATOMIC_ACQ_REL)
  868. #define ENET_ATOMIC_INC_BY(ptr, delta) __atomic_fetch_add((ptr), (delta), __ATOMIC_ACQ_REL)
  869. #define ENET_ATOMIC_DEC_BY(ptr, delta) __atomic_fetch_sub((ptr), (delta), __ATOMIC_ACQ_REL)
  870. #else
  871. #define ENET_ATOMIC_READ(variable) __sync_fetch_and_add(variable, 0)
  872. #define ENET_ATOMIC_WRITE(variable, new_val) (void)__sync_val_compare_and_swap((variable), *(variable), (new_val))
  873. #define ENET_ATOMIC_CAS(variable, old_value, new_val) __sync_val_compare_and_swap((variable), (old_value), (new_val))
  874. #define ENET_ATOMIC_INC(variable) __sync_fetch_and_add((variable), 1)
  875. #define ENET_ATOMIC_DEC(variable) __sync_fetch_and_sub((variable), 1)
  876. #define ENET_ATOMIC_INC_BY(variable, delta) __sync_fetch_and_add((variable), (delta), 1)
  877. #define ENET_ATOMIC_DEC_BY(variable, delta) __sync_fetch_and_sub((variable), (delta), 1)
  878. #endif
  879. #undef AT_HAVE_ATOMICS
  880. #endif
  881. /*
  882. =======================================================================
  883. Callbacks
  884. =======================================================================
  885. */
  886. static ENetCallbacks callbacks = {
  887. malloc,
  888. free,
  889. abort
  890. };
  891. int enet_initialize_with_callbacks(ENetVersion version, const ENetCallbacks* inits) {
  892. if (version < ENET_VERSION_CREATE(1, 3, 0))
  893. return -1;
  894. if (inits->malloc != NULL || inits->free != NULL) {
  895. if (inits->malloc == NULL || inits->free == NULL)
  896. return -1;
  897. callbacks.malloc = inits->malloc;
  898. callbacks.free = inits->free;
  899. }
  900. if (inits->noMemory != NULL)
  901. callbacks.noMemory = inits->noMemory;
  902. return enet_initialize();
  903. }
  904. void* enet_malloc(size_t size) {
  905. void* memory = callbacks.malloc(size);
  906. if (memory == NULL)
  907. callbacks.noMemory();
  908. return memory;
  909. }
  910. void enet_free(void* memory) {
  911. callbacks.free(memory);
  912. }
  913. /*
  914. =======================================================================
  915. List
  916. =======================================================================
  917. */
  918. void enet_list_clear(ENetList* list) {
  919. list->sentinel.next = &list->sentinel;
  920. list->sentinel.previous = &list->sentinel;
  921. }
  922. ENetListIterator enet_list_insert(ENetListIterator position, void* data) {
  923. ENetListIterator result = (ENetListIterator)data;
  924. result->previous = position->previous;
  925. result->next = position;
  926. result->previous->next = result;
  927. position->previous = result;
  928. return result;
  929. }
  930. void* enet_list_remove(ENetListIterator position) {
  931. position->previous->next = position->next;
  932. position->next->previous = position->previous;
  933. return position;
  934. }
  935. ENetListIterator enet_list_move(ENetListIterator position, void* dataFirst, void* dataLast) {
  936. ENetListIterator first = (ENetListIterator)dataFirst;
  937. ENetListIterator last = (ENetListIterator)dataLast;
  938. first->previous->next = last->next;
  939. last->next->previous = first->previous;
  940. first->previous = position->previous;
  941. last->next = position;
  942. first->previous->next = first;
  943. position->previous = last;
  944. return first;
  945. }
  946. size_t enet_list_size(ENetList* list) {
  947. size_t size = 0;
  948. ENetListIterator position;
  949. for (position = enet_list_begin(list); position != enet_list_end(list); position = enet_list_next(position)) {
  950. ++size;
  951. }
  952. return size;
  953. }
  954. /*
  955. =======================================================================
  956. Utilities
  957. =======================================================================
  958. */
  959. ENetVersion enet_linked_version(void) {
  960. return ENET_VERSION;
  961. }
  962. int enet_array_is_zeroed(const uint8_t* array, int length) {
  963. size_t i;
  964. for (i = 0; i < length; i++) {
  965. if (array[i] != 0)
  966. return -1;
  967. }
  968. return 0;
  969. }
  970. size_t enet_string_copy(char* destination, const char* source, size_t length) {
  971. char *d = destination;
  972. const char *s = source;
  973. size_t n = length;
  974. if (n != 0 && --n != 0) {
  975. do {
  976. if ((*d++ = *s++) == 0)
  977. break;
  978. }
  979. while (--n != 0);
  980. }
  981. if (n == 0) {
  982. if (length != 0)
  983. *d = '\0';
  984. while (*s++);
  985. }
  986. return (s - source - 1);
  987. }
  988. /*
  989. =======================================================================
  990. Time
  991. =======================================================================
  992. */
  993. #ifdef _WIN32
  994. static LARGE_INTEGER gettime_offset(void) {
  995. SYSTEMTIME s;
  996. FILETIME f;
  997. LARGE_INTEGER t;
  998. s.wYear = 1970;
  999. s.wMonth = 1;
  1000. s.wDay = 1;
  1001. s.wHour = 0;
  1002. s.wMinute = 0;
  1003. s.wSecond = 0;
  1004. s.wMilliseconds = 0;
  1005. SystemTimeToFileTime(&s, &f);
  1006. t.QuadPart = f.dwHighDateTime;
  1007. t.QuadPart <<= 32;
  1008. t.QuadPart |= f.dwLowDateTime;
  1009. return t;
  1010. }
  1011. int clock_gettime(int X, struct timespec* tv) {
  1012. LARGE_INTEGER t;
  1013. FILETIME f;
  1014. double microseconds;
  1015. static LARGE_INTEGER offset;
  1016. static double frequencyToMicroseconds;
  1017. static int initialized = 0;
  1018. static BOOL usePerformanceCounter = 0;
  1019. if (!initialized) {
  1020. LARGE_INTEGER performanceFrequency;
  1021. initialized = 1;
  1022. usePerformanceCounter = QueryPerformanceFrequency(&performanceFrequency);
  1023. if (usePerformanceCounter) {
  1024. QueryPerformanceCounter(&offset);
  1025. frequencyToMicroseconds = (double)performanceFrequency.QuadPart / 1000000.;
  1026. } else {
  1027. offset = gettime_offset();
  1028. frequencyToMicroseconds = 10.;
  1029. }
  1030. }
  1031. if (usePerformanceCounter) {
  1032. QueryPerformanceCounter(&t);
  1033. } else {
  1034. GetSystemTimeAsFileTime(&f);
  1035. t.QuadPart = f.dwHighDateTime;
  1036. t.QuadPart <<= 32;
  1037. t.QuadPart |= f.dwLowDateTime;
  1038. }
  1039. t.QuadPart -= offset.QuadPart;
  1040. microseconds = (double)t.QuadPart / frequencyToMicroseconds;
  1041. t.QuadPart = (LONGLONG)microseconds;
  1042. tv->tv_sec = (long)(t.QuadPart / 1000000);
  1043. tv->tv_nsec = t.QuadPart % 1000000 * 1000;
  1044. return 0;
  1045. }
  1046. #elif __APPLE__ && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 && !defined(CLOCK_MONOTONIC)
  1047. #define CLOCK_MONOTONIC 0
  1048. int clock_gettime(int X, struct timespec* ts) {
  1049. clock_serv_t cclock;
  1050. mach_timespec_t mts;
  1051. host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
  1052. clock_get_time(cclock, &mts);
  1053. mach_port_deallocate(mach_task_self(), cclock);
  1054. ts->tv_sec = mts.tv_sec;
  1055. ts->tv_nsec = mts.tv_nsec;
  1056. return 0;
  1057. }
  1058. #endif
  1059. enet_uint32 enet_time_get(void) {
  1060. static enet_uint64 start_time_ns = 0;
  1061. struct timespec ts;
  1062. #ifdef CLOCK_MONOTONIC_RAW
  1063. clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
  1064. #else
  1065. clock_gettime(CLOCK_MONOTONIC, &ts);
  1066. #endif
  1067. static const enet_uint64 ns_in_s = 1000 * 1000 * 1000;
  1068. static const enet_uint64 ns_in_ms = 1000 * 1000;
  1069. enet_uint64 current_time_ns = ts.tv_nsec + (enet_uint64)ts.tv_sec * ns_in_s;
  1070. enet_uint64 offset_ns = ENET_ATOMIC_READ(&start_time_ns);
  1071. if (offset_ns == 0) {
  1072. enet_uint64 want_value = current_time_ns - 1 * ns_in_ms;
  1073. enet_uint64 old_value = ENET_ATOMIC_CAS(&start_time_ns, 0, want_value);
  1074. offset_ns = old_value == 0 ? want_value : old_value;
  1075. }
  1076. enet_uint64 result_in_ns = current_time_ns - offset_ns;
  1077. return (enet_uint32)(result_in_ns / ns_in_ms);
  1078. }
  1079. /*
  1080. =======================================================================
  1081. Checksum
  1082. =======================================================================
  1083. */
  1084. static int initializedCRC32 = 0;
  1085. static enet_uint32 crcTable[256];
  1086. static enet_uint32 reflect_crc(int val, int bits) {
  1087. int result = 0, bit;
  1088. for (bit = 0; bit < bits; bit++) {
  1089. if (val & 1)
  1090. result |= 1 << (bits - 1 - bit);
  1091. val >>= 1;
  1092. }
  1093. return result;
  1094. }
  1095. static void initialize_crc32(void) {
  1096. int byte;
  1097. for (byte = 0; byte < 256; ++byte) {
  1098. enet_uint32 crc = reflect_crc(byte, 8) << 24;
  1099. int offset;
  1100. for (offset = 0; offset < 8; ++offset) {
  1101. if (crc & 0x80000000)
  1102. crc = (crc << 1) ^ 0x04c11db7;
  1103. else
  1104. crc <<= 1;
  1105. }
  1106. crcTable[byte] = reflect_crc(crc, 32);
  1107. }
  1108. initializedCRC32 = 1;
  1109. }
  1110. enet_uint32 enet_crc32(const ENetBuffer* buffers, size_t bufferCount) {
  1111. enet_uint32 crc = 0xFFFFFFFF;
  1112. if (!initializedCRC32)
  1113. initialize_crc32();
  1114. while (bufferCount-- > 0) {
  1115. const enet_uint8* data = (const enet_uint8*)buffers->data;
  1116. const enet_uint8* dataEnd = &data[buffers->dataLength];
  1117. while (data < dataEnd) {
  1118. crc = (crc >> 8) ^ crcTable[(crc & 0xFF)^* data++];
  1119. }
  1120. ++buffers;
  1121. }
  1122. return ENET_HOST_TO_NET_32(~crc);
  1123. }
  1124. /*
  1125. =======================================================================
  1126. Packet
  1127. =======================================================================
  1128. */
  1129. ENetPacket* enet_packet_create(const void* data, size_t dataLength, enet_uint32 flags) {
  1130. ENetPacket* packet;
  1131. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1132. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1133. if (packet == NULL)
  1134. return NULL;
  1135. packet->data = (enet_uint8*)data;
  1136. } else {
  1137. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength);
  1138. if (packet == NULL)
  1139. return NULL;
  1140. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1141. if (data != NULL)
  1142. memcpy(packet->data, data, dataLength);
  1143. }
  1144. packet->referenceCount = 0;
  1145. packet->flags = flags;
  1146. packet->dataLength = dataLength;
  1147. packet->freeCallback = NULL;
  1148. return packet;
  1149. }
  1150. ENetPacket* enet_packet_create_offset(const void* data, size_t dataLength, size_t dataOffset, enet_uint32 flags) {
  1151. ENetPacket* packet;
  1152. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1153. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1154. if (packet == NULL)
  1155. return NULL;
  1156. packet->data = (enet_uint8*)data;
  1157. } else {
  1158. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength - dataOffset);
  1159. if (packet == NULL)
  1160. return NULL;
  1161. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1162. if (data != NULL)
  1163. memcpy(packet->data, (char*)data + dataOffset, dataLength - dataOffset);
  1164. }
  1165. packet->referenceCount = 0;
  1166. packet->flags = flags;
  1167. packet->dataLength = dataLength - dataOffset;
  1168. packet->freeCallback = NULL;
  1169. return packet;
  1170. }
  1171. void enet_packet_destroy(ENetPacket* packet) {
  1172. if (packet == NULL)
  1173. return;
  1174. if (packet->freeCallback != NULL)
  1175. (*packet->freeCallback)((void*)packet);
  1176. enet_free(packet);
  1177. }
  1178. /*
  1179. =======================================================================
  1180. Protocol
  1181. =======================================================================
  1182. */
  1183. static size_t commandSizes[ENET_PROTOCOL_COMMAND_COUNT] = {
  1184. 0,
  1185. sizeof(ENetProtocolAcknowledge),
  1186. sizeof(ENetProtocolConnect),
  1187. sizeof(ENetProtocolVerifyConnect),
  1188. sizeof(ENetProtocolDisconnect),
  1189. sizeof(ENetProtocolPing),
  1190. sizeof(ENetProtocolSendReliable),
  1191. sizeof(ENetProtocolSendUnreliable),
  1192. sizeof(ENetProtocolSendFragment),
  1193. sizeof(ENetProtocolSendUnsequenced),
  1194. sizeof(ENetProtocolBandwidthLimit),
  1195. sizeof(ENetProtocolThrottleConfigure),
  1196. sizeof(ENetProtocolSendFragment)
  1197. };
  1198. size_t enet_protocol_command_size(enet_uint8 commandNumber) {
  1199. return commandSizes[commandNumber & ENET_PROTOCOL_COMMAND_MASK];
  1200. }
  1201. static void enet_protocol_change_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1202. if (state == ENET_PEER_STATE_CONNECTED || state == ENET_PEER_STATE_DISCONNECT_LATER)
  1203. enet_peer_on_connect(peer);
  1204. else
  1205. enet_peer_on_disconnect(peer);
  1206. peer->state = state;
  1207. }
  1208. static void enet_protocol_dispatch_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1209. enet_protocol_change_state(host, peer, state);
  1210. if (!peer->needsDispatch) {
  1211. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1212. peer->needsDispatch = 1;
  1213. }
  1214. }
  1215. static int enet_protocol_dispatch_incoming_commands(ENetHost* host, ENetEvent* event) {
  1216. while (!enet_list_empty(&host->dispatchQueue)) {
  1217. ENetPeer* peer = (ENetPeer*)enet_list_remove(enet_list_begin(&host->dispatchQueue));
  1218. peer->needsDispatch = 0;
  1219. switch (peer->state) {
  1220. case ENET_PEER_STATE_CONNECTION_PENDING:
  1221. case ENET_PEER_STATE_CONNECTION_SUCCEEDED:
  1222. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1223. event->type = ENET_EVENT_TYPE_CONNECT;
  1224. event->peer = peer;
  1225. event->data = peer->eventData;
  1226. return 1;
  1227. case ENET_PEER_STATE_ZOMBIE:
  1228. host->recalculateBandwidthLimits = 1;
  1229. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1230. event->peer = peer;
  1231. event->data = peer->eventData;
  1232. enet_peer_reset(peer);
  1233. return 1;
  1234. case ENET_PEER_STATE_CONNECTED:
  1235. if (enet_list_empty(&peer->dispatchedCommands))
  1236. continue;
  1237. event->packet = enet_peer_receive(peer, &event->channelID);
  1238. if (event->packet == NULL)
  1239. continue;
  1240. event->type = ENET_EVENT_TYPE_RECEIVE;
  1241. event->peer = peer;
  1242. if (!enet_list_empty(&peer->dispatchedCommands)) {
  1243. peer->needsDispatch = 1;
  1244. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1245. }
  1246. return 1;
  1247. default:
  1248. break;
  1249. }
  1250. }
  1251. return 0;
  1252. }
  1253. static void enet_protocol_notify_connect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1254. host->recalculateBandwidthLimits = 1;
  1255. if (event != NULL) {
  1256. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1257. peer->totalDataSent = 0;
  1258. peer->totalDataReceived = 0;
  1259. peer->totalPacketsSent = 0;
  1260. peer->totalPacketsLost = 0;
  1261. event->type = ENET_EVENT_TYPE_CONNECT;
  1262. event->peer = peer;
  1263. event->data = peer->eventData;
  1264. } else {
  1265. enet_protocol_dispatch_state(host, peer, peer->state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING);
  1266. }
  1267. }
  1268. static void enet_protocol_notify_disconnect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1269. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1270. host->recalculateBandwidthLimits = 1;
  1271. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1272. enet_peer_reset(peer);
  1273. } else if (event != NULL) {
  1274. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1275. event->peer = peer;
  1276. event->data = 0;
  1277. enet_peer_reset(peer);
  1278. } else {
  1279. peer->eventData = 0;
  1280. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1281. }
  1282. }
  1283. static void enet_protocol_notify_disconnect_timeout(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1284. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1285. host->recalculateBandwidthLimits = 1;
  1286. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1287. enet_peer_reset(peer);
  1288. } else if (event != NULL) {
  1289. event->type = ENET_EVENT_TYPE_DISCONNECT_TIMEOUT;
  1290. event->peer = peer;
  1291. event->data = 0;
  1292. enet_peer_reset(peer);
  1293. } else {
  1294. peer->eventData = 0;
  1295. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1296. }
  1297. }
  1298. static void enet_protocol_remove_sent_unreliable_commands(ENetPeer* peer) {
  1299. ENetOutgoingCommand* outgoingCommand;
  1300. if (enet_list_empty(&peer->sentUnreliableCommands))
  1301. return;
  1302. do {
  1303. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentUnreliableCommands);
  1304. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1305. if (outgoingCommand->packet != NULL) {
  1306. --outgoingCommand->packet->referenceCount;
  1307. if (outgoingCommand->packet->referenceCount == 0) {
  1308. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1309. enet_packet_destroy(outgoingCommand->packet);
  1310. }
  1311. }
  1312. enet_free(outgoingCommand);
  1313. }
  1314. while (!enet_list_empty(&peer->sentUnreliableCommands));
  1315. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1316. enet_peer_disconnect(peer, peer->eventData);
  1317. }
  1318. static ENetProtocolCommand enet_protocol_remove_sent_reliable_command(ENetPeer* peer, enet_uint16 reliableSequenceNumber, enet_uint8 channelID) {
  1319. ENetOutgoingCommand* outgoingCommand = NULL;
  1320. ENetListIterator currentCommand;
  1321. ENetProtocolCommand commandNumber;
  1322. int wasSent = 1;
  1323. for (currentCommand = enet_list_begin(&peer->sentReliableCommands); currentCommand != enet_list_end(&peer->sentReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1324. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1325. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1326. break;
  1327. }
  1328. if (currentCommand == enet_list_end(&peer->sentReliableCommands)) {
  1329. for (currentCommand = enet_list_begin(&peer->outgoingReliableCommands); currentCommand != enet_list_end(&peer->outgoingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1330. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1331. if (outgoingCommand->sendAttempts < 1)
  1332. return ENET_PROTOCOL_COMMAND_NONE;
  1333. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1334. break;
  1335. }
  1336. if (currentCommand == enet_list_end(&peer->outgoingReliableCommands))
  1337. return ENET_PROTOCOL_COMMAND_NONE;
  1338. wasSent = 0;
  1339. }
  1340. if (outgoingCommand == NULL)
  1341. return ENET_PROTOCOL_COMMAND_NONE;
  1342. if (channelID < peer->channelCount) {
  1343. ENetChannel* channel = &peer->channels[channelID];
  1344. enet_uint16 reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1345. if (channel->reliableWindows[reliableWindow] > 0) {
  1346. --channel->reliableWindows[reliableWindow];
  1347. if (!channel->reliableWindows[reliableWindow])
  1348. channel->usedReliableWindows &= ~(1 << reliableWindow);
  1349. }
  1350. }
  1351. commandNumber = (ENetProtocolCommand)(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK);
  1352. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1353. if (outgoingCommand->packet != NULL) {
  1354. if (wasSent)
  1355. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  1356. --outgoingCommand->packet->referenceCount;
  1357. if (outgoingCommand->packet->referenceCount == 0) {
  1358. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1359. enet_packet_destroy(outgoingCommand->packet);
  1360. }
  1361. }
  1362. enet_free(outgoingCommand);
  1363. if (enet_list_empty(&peer->sentReliableCommands))
  1364. return commandNumber;
  1365. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentReliableCommands);
  1366. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  1367. return commandNumber;
  1368. }
  1369. static ENetPeer* enet_protocol_handle_connect(ENetHost* host, ENetProtocolHeader* header, ENetProtocol* command) {
  1370. enet_uint8 incomingSessionID, outgoingSessionID;
  1371. enet_uint32 mtu, windowSize;
  1372. ENetChannel* channel;
  1373. size_t channelCount, duplicatePeers = 0;
  1374. ENetPeer* currentPeer, *peer = NULL;
  1375. ENetProtocol verifyCommand;
  1376. channelCount = ENET_NET_TO_HOST_32(command->connect.channelCount);
  1377. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  1378. return NULL;
  1379. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  1380. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED) {
  1381. if (peer == NULL)
  1382. peer = currentPeer;
  1383. } else if (currentPeer->state != ENET_PEER_STATE_CONNECTING && enet_in6_equal(currentPeer->address.ipv6, host->receivedAddress.ipv6)) {
  1384. if (currentPeer->address.port == host->receivedAddress.port && currentPeer->connectID == command->connect.connectID)
  1385. return NULL;
  1386. ++duplicatePeers;
  1387. }
  1388. }
  1389. if (peer == NULL || duplicatePeers >= host->duplicatePeers)
  1390. return NULL;
  1391. if (channelCount > host->channelLimit)
  1392. channelCount = host->channelLimit;
  1393. peer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  1394. if (peer->channels == NULL)
  1395. return NULL;
  1396. peer->channelCount = channelCount;
  1397. peer->state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
  1398. peer->connectID = command->connect.connectID;
  1399. peer->address = host->receivedAddress;
  1400. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->connect.outgoingPeerID);
  1401. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->connect.incomingBandwidth);
  1402. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->connect.outgoingBandwidth);
  1403. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->connect.packetThrottleInterval);
  1404. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleAcceleration);
  1405. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleDeceleration);
  1406. peer->eventData = ENET_NET_TO_HOST_32(command->connect.data);
  1407. incomingSessionID = command->connect.incomingSessionID == 0xFF ? peer->outgoingSessionID : command->connect.incomingSessionID;
  1408. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1409. if (incomingSessionID == peer->outgoingSessionID)
  1410. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1411. peer->outgoingSessionID = incomingSessionID;
  1412. outgoingSessionID = command->connect.outgoingSessionID == 0xFF ? peer->incomingSessionID : command->connect.outgoingSessionID;
  1413. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1414. if (outgoingSessionID == peer->incomingSessionID)
  1415. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1416. peer->incomingSessionID = outgoingSessionID;
  1417. for (channel = peer->channels; channel < &peer->channels[channelCount]; ++channel) {
  1418. channel->outgoingReliableSequenceNumber = 0;
  1419. channel->outgoingUnreliableSequenceNumber = 0;
  1420. channel->incomingReliableSequenceNumber = 0;
  1421. channel->incomingUnreliableSequenceNumber = 0;
  1422. enet_list_clear(&channel->incomingReliableCommands);
  1423. enet_list_clear(&channel->incomingUnreliableCommands);
  1424. channel->usedReliableWindows = 0;
  1425. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  1426. }
  1427. mtu = ENET_NET_TO_HOST_32(command->connect.mtu);
  1428. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1429. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1430. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1431. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1432. peer->mtu = mtu;
  1433. if (host->outgoingBandwidth == 0 && peer->incomingBandwidth == 0)
  1434. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1435. else if (host->outgoingBandwidth == 0 || peer->incomingBandwidth == 0)
  1436. peer->windowSize = (ENET_MAX(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1437. else
  1438. peer->windowSize = (ENET_MIN(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1439. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1440. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1441. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1442. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1443. if (host->incomingBandwidth == 0)
  1444. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1445. else
  1446. windowSize = (host->incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1447. if (windowSize > ENET_NET_TO_HOST_32(command->connect.windowSize))
  1448. windowSize = ENET_NET_TO_HOST_32(command->connect.windowSize);
  1449. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1450. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1451. else if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1452. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1453. verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  1454. verifyCommand.header.channelID = 0xFF;
  1455. verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16(peer->incomingPeerID);
  1456. verifyCommand.verifyConnect.incomingSessionID = incomingSessionID;
  1457. verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID;
  1458. verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_32(peer->mtu);
  1459. verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32(windowSize);
  1460. verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  1461. verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  1462. verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  1463. verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32(peer->packetThrottleInterval);
  1464. verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(peer->packetThrottleAcceleration);
  1465. verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(peer->packetThrottleDeceleration);
  1466. verifyCommand.verifyConnect.connectID = peer->connectID;
  1467. enet_peer_queue_outgoing_command(peer, &verifyCommand, NULL, 0, 0);
  1468. return peer;
  1469. }
  1470. static int enet_protocol_handle_send_reliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1471. size_t dataLength;
  1472. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1473. return -1;
  1474. dataLength = ENET_NET_TO_HOST_16(command->sendReliable.dataLength);
  1475. *currentData += dataLength;
  1476. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1477. return -1;
  1478. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendReliable), dataLength, ENET_PACKET_FLAG_RELIABLE, 0) == NULL)
  1479. return -1;
  1480. return 0;
  1481. }
  1482. static int enet_protocol_handle_send_unsequenced(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1483. enet_uint32 unsequencedGroup, index;
  1484. size_t dataLength;
  1485. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1486. return -1;
  1487. dataLength = ENET_NET_TO_HOST_16(command->sendUnsequenced.dataLength);
  1488. *currentData += dataLength;
  1489. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1490. return -1;
  1491. unsequencedGroup = ENET_NET_TO_HOST_16(command->sendUnsequenced.unsequencedGroup);
  1492. index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
  1493. if (unsequencedGroup < peer->incomingUnsequencedGroup)
  1494. unsequencedGroup += 0x10000;
  1495. if (unsequencedGroup >= (enet_uint32)peer->incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE)
  1496. return 0;
  1497. unsequencedGroup &= 0xFFFF;
  1498. if (unsequencedGroup - index != peer->incomingUnsequencedGroup) {
  1499. peer->incomingUnsequencedGroup = unsequencedGroup - index;
  1500. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  1501. } else if (peer->unsequencedWindow[index / 32] & (1 << (index % 32))) {
  1502. return 0;
  1503. }
  1504. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnsequenced), dataLength, ENET_PACKET_FLAG_UNSEQUENCED, 0) == NULL)
  1505. return -1;
  1506. peer->unsequencedWindow[index / 32] |= 1 << (index % 32);
  1507. return 0;
  1508. }
  1509. static int enet_protocol_handle_send_unreliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1510. size_t dataLength;
  1511. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1512. return -1;
  1513. dataLength = ENET_NET_TO_HOST_16(command->sendUnreliable.dataLength);
  1514. *currentData += dataLength;
  1515. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1516. return -1;
  1517. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnreliable), dataLength, 0, 0) == NULL)
  1518. return -1;
  1519. return 0;
  1520. }
  1521. static int enet_protocol_handle_send_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1522. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, startSequenceNumber, totalLength;
  1523. ENetChannel* channel;
  1524. enet_uint16 startWindow, currentWindow;
  1525. ENetListIterator currentCommand;
  1526. ENetIncomingCommand* startCommand = NULL;
  1527. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1528. return -1;
  1529. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1530. *currentData += fragmentLength;
  1531. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1532. return -1;
  1533. channel = &peer->channels[command->header.channelID];
  1534. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1535. startWindow = startSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1536. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1537. if (startSequenceNumber < channel->incomingReliableSequenceNumber)
  1538. startWindow += ENET_PEER_RELIABLE_WINDOWS;
  1539. if (startWindow < currentWindow || startWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1540. return 0;
  1541. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1542. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1543. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1544. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1545. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1546. return -1;
  1547. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1548. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1549. if (startSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1550. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1551. continue;
  1552. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1553. break;
  1554. }
  1555. if (incomingCommand->reliableSequenceNumber <= startSequenceNumber) {
  1556. if (incomingCommand->reliableSequenceNumber < startSequenceNumber)
  1557. break;
  1558. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1559. return -1;
  1560. startCommand = incomingCommand;
  1561. break;
  1562. }
  1563. }
  1564. if (startCommand == NULL) {
  1565. ENetProtocol hostCommand = *command;
  1566. hostCommand.header.reliableSequenceNumber = startSequenceNumber;
  1567. startCommand = enet_peer_queue_incoming_command(peer, &hostCommand, NULL, totalLength, ENET_PACKET_FLAG_RELIABLE, fragmentCount);
  1568. if (startCommand == NULL)
  1569. return -1;
  1570. }
  1571. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1572. --startCommand->fragmentsRemaining;
  1573. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1574. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1575. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1576. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1577. if (startCommand->fragmentsRemaining <= 0)
  1578. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  1579. }
  1580. return 0;
  1581. }
  1582. static int enet_protocol_handle_send_unreliable_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1583. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, reliableSequenceNumber, startSequenceNumber, totalLength;
  1584. enet_uint16 reliableWindow, currentWindow;
  1585. ENetChannel* channel;
  1586. ENetListIterator currentCommand;
  1587. ENetIncomingCommand* startCommand = NULL;
  1588. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1589. return -1;
  1590. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1591. *currentData += fragmentLength;
  1592. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1593. return -1;
  1594. channel = &peer->channels[command->header.channelID];
  1595. reliableSequenceNumber = command->header.reliableSequenceNumber;
  1596. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1597. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1598. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1599. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1600. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  1601. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1602. return 0;
  1603. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && startSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  1604. return 0;
  1605. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1606. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1607. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1608. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1609. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1610. return -1;
  1611. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1612. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1613. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1614. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1615. continue;
  1616. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1617. break;
  1618. }
  1619. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  1620. break;
  1621. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  1622. continue;
  1623. if (incomingCommand->unreliableSequenceNumber <= startSequenceNumber) {
  1624. if (incomingCommand->unreliableSequenceNumber < startSequenceNumber)
  1625. break;
  1626. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1627. return -1;
  1628. startCommand = incomingCommand;
  1629. break;
  1630. }
  1631. }
  1632. if (startCommand == NULL) {
  1633. startCommand = enet_peer_queue_incoming_command(peer, command, NULL, totalLength,
  1634. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED, fragmentCount);
  1635. if (startCommand == NULL)
  1636. return -1;
  1637. }
  1638. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1639. --startCommand->fragmentsRemaining;
  1640. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1641. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1642. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1643. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1644. if (startCommand->fragmentsRemaining <= 0)
  1645. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  1646. }
  1647. return 0;
  1648. }
  1649. static int enet_protocol_handle_ping(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1650. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1651. return -1;
  1652. return 0;
  1653. }
  1654. static int enet_protocol_handle_bandwidth_limit(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1655. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1656. return -1;
  1657. if (peer->incomingBandwidth != 0)
  1658. --host->bandwidthLimitedPeers;
  1659. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.incomingBandwidth);
  1660. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.outgoingBandwidth);
  1661. if (peer->incomingBandwidth != 0)
  1662. ++host->bandwidthLimitedPeers;
  1663. if (peer->incomingBandwidth == 0 && host->outgoingBandwidth == 0)
  1664. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1665. else if (peer->incomingBandwidth == 0 || host->outgoingBandwidth == 0)
  1666. peer->windowSize = (ENET_MAX(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1667. else
  1668. peer->windowSize = (ENET_MIN(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1669. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1670. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1671. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1672. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1673. return 0;
  1674. }
  1675. static int enet_protocol_handle_throttle_configure(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1676. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1677. return -1;
  1678. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleInterval);
  1679. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleAcceleration);
  1680. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleDeceleration);
  1681. return 0;
  1682. }
  1683. static int enet_protocol_handle_disconnect(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1684. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT)
  1685. return 0;
  1686. enet_peer_reset_queues(peer);
  1687. if (peer->state == ENET_PEER_STATE_CONNECTION_SUCCEEDED || peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_CONNECTING) {
  1688. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1689. } else if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1690. if (peer->state == ENET_PEER_STATE_CONNECTION_PENDING)
  1691. host->recalculateBandwidthLimits = 1;
  1692. enet_peer_reset(peer);
  1693. } else if (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  1694. enet_protocol_change_state(host, peer, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT);
  1695. } else {
  1696. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1697. }
  1698. if (peer->state != ENET_PEER_STATE_DISCONNECTED)
  1699. peer->eventData = ENET_NET_TO_HOST_32(command->disconnect.data);
  1700. return 0;
  1701. }
  1702. static int enet_protocol_handle_acknowledge(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1703. enet_uint32 roundTripTime, receivedSentTime, receivedReliableSequenceNumber;
  1704. ENetProtocolCommand commandNumber;
  1705. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE)
  1706. return 0;
  1707. receivedSentTime = ENET_NET_TO_HOST_16(command->acknowledge.receivedSentTime);
  1708. receivedSentTime |= host->serviceTime & 0xFFFF0000;
  1709. if ((receivedSentTime & 0x8000) > (host->serviceTime & 0x8000))
  1710. receivedSentTime -= 0x10000;
  1711. if (ENET_TIME_LESS(host->serviceTime, receivedSentTime))
  1712. return 0;
  1713. peer->lastReceiveTime = host->serviceTime;
  1714. peer->earliestTimeout = 0;
  1715. roundTripTime = ENET_TIME_DIFFERENCE(host->serviceTime, receivedSentTime);
  1716. if (roundTripTime == 0)
  1717. roundTripTime = 1;
  1718. if (peer->smoothedRoundTripTime == 0)
  1719. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * ENET_SRTT_INITIAL + ENET_SRTT_PARA_G * roundTripTime);
  1720. else
  1721. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * peer->smoothedRoundTripTime + ENET_SRTT_PARA_G * roundTripTime);
  1722. enet_peer_throttle(peer, peer->smoothedRoundTripTime);
  1723. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1724. if (peer->smoothedRoundTripTime >= peer->roundTripTime) {
  1725. peer->roundTripTime += (peer->smoothedRoundTripTime - peer->roundTripTime) / 8;
  1726. peer->roundTripTimeVariance += (peer->smoothedRoundTripTime - peer->roundTripTime) / 4;
  1727. } else {
  1728. peer->roundTripTime -= (peer->roundTripTime - peer->smoothedRoundTripTime) / 8;
  1729. peer->roundTripTimeVariance += (peer->roundTripTime - peer->smoothedRoundTripTime) / 4;
  1730. }
  1731. if (peer->roundTripTime < peer->lowestRoundTripTime)
  1732. peer->lowestRoundTripTime = peer->roundTripTime;
  1733. if (peer->roundTripTimeVariance > peer->highestRoundTripTimeVariance)
  1734. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1735. if (peer->packetThrottleEpoch == 0 || ENET_TIME_DIFFERENCE(host->serviceTime, peer->packetThrottleEpoch) >= peer->packetThrottleInterval) {
  1736. peer->lastRoundTripTime = peer->lowestRoundTripTime;
  1737. peer->lastRoundTripTimeVariance = peer->highestRoundTripTimeVariance;
  1738. peer->lowestRoundTripTime = peer->roundTripTime;
  1739. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1740. peer->packetThrottleEpoch = host->serviceTime;
  1741. }
  1742. receivedReliableSequenceNumber = ENET_NET_TO_HOST_16(command->acknowledge.receivedReliableSequenceNumber);
  1743. commandNumber = enet_protocol_remove_sent_reliable_command(peer, receivedReliableSequenceNumber, command->header.channelID);
  1744. switch (peer->state) {
  1745. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1746. if (commandNumber != ENET_PROTOCOL_COMMAND_VERIFY_CONNECT)
  1747. return -1;
  1748. enet_protocol_notify_connect(host, peer, event);
  1749. break;
  1750. case ENET_PEER_STATE_DISCONNECTING:
  1751. if (commandNumber != ENET_PROTOCOL_COMMAND_DISCONNECT)
  1752. return -1;
  1753. enet_protocol_notify_disconnect(host, peer, event);
  1754. break;
  1755. case ENET_PEER_STATE_DISCONNECT_LATER:
  1756. if (enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1757. enet_peer_disconnect(peer, peer->eventData);
  1758. break;
  1759. default:
  1760. break;
  1761. }
  1762. return 0;
  1763. }
  1764. static int enet_protocol_handle_verify_connect(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1765. enet_uint32 mtu, windowSize;
  1766. size_t channelCount;
  1767. if (peer->state != ENET_PEER_STATE_CONNECTING)
  1768. return 0;
  1769. channelCount = ENET_NET_TO_HOST_32(command->verifyConnect.channelCount);
  1770. 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) {
  1771. peer->eventData = 0;
  1772. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1773. return -1;
  1774. }
  1775. enet_protocol_remove_sent_reliable_command(peer, 1, 0xFF);
  1776. if (channelCount < peer->channelCount)
  1777. peer->channelCount = channelCount;
  1778. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->verifyConnect.outgoingPeerID);
  1779. peer->incomingSessionID = command->verifyConnect.incomingSessionID;
  1780. peer->outgoingSessionID = command->verifyConnect.outgoingSessionID;
  1781. mtu = ENET_NET_TO_HOST_32(command->verifyConnect.mtu);
  1782. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1783. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1784. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1785. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1786. if (mtu < peer->mtu)
  1787. peer->mtu = mtu;
  1788. windowSize = ENET_NET_TO_HOST_32(command->verifyConnect.windowSize);
  1789. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1790. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1791. if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1792. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1793. if (windowSize < peer->windowSize)
  1794. peer->windowSize = windowSize;
  1795. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.incomingBandwidth);
  1796. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.outgoingBandwidth);
  1797. enet_protocol_notify_connect(host, peer, event);
  1798. return 0;
  1799. }
  1800. static int enet_protocol_handle_incoming_commands(ENetHost* host, ENetEvent* event) {
  1801. ENetProtocolHeader* header;
  1802. ENetProtocol* command;
  1803. ENetPeer* peer;
  1804. enet_uint8* currentData;
  1805. size_t headerSize;
  1806. enet_uint16 peerID, flags;
  1807. enet_uint8 sessionID;
  1808. if (host->receivedDataLength < (size_t)&((ENetProtocolHeader*)0)->sentTime)
  1809. return 0;
  1810. header = (ENetProtocolHeader*)host->receivedData;
  1811. peerID = ENET_NET_TO_HOST_16(header->peerID);
  1812. sessionID = (peerID & ENET_PROTOCOL_HEADER_SESSION_MASK) >> ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  1813. flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK;
  1814. peerID &= ~(ENET_PROTOCOL_HEADER_FLAG_MASK | ENET_PROTOCOL_HEADER_SESSION_MASK);
  1815. headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof(ENetProtocolHeader) : (size_t)&((ENetProtocolHeader*)0)->sentTime);
  1816. if (host->checksumCallback != NULL)
  1817. headerSize += sizeof(enet_uint32);
  1818. if (peerID == ENET_PROTOCOL_MAXIMUM_PEER_ID) {
  1819. peer = NULL;
  1820. } else if (peerID >= host->peerCount) {
  1821. return 0;
  1822. } else {
  1823. peer = &host->peers[peerID];
  1824. 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))
  1825. return 0;
  1826. }
  1827. #ifdef ENET_LZ4
  1828. if (flags & ENET_PROTOCOL_HEADER_FLAG_COMPRESSED) {
  1829. size_t originalSize = LZ4_decompress_safe((const char*)host->receivedData + headerSize, (char*)host->packetData[1] + headerSize, host->receivedDataLength - headerSize, sizeof(host->packetData[1]) - headerSize);
  1830. if (originalSize <= 0 || originalSize > sizeof(host->packetData[1]) - headerSize)
  1831. return 0;
  1832. memcpy(host->packetData[1], header, headerSize);
  1833. host->receivedData = host->packetData[1];
  1834. host->receivedDataLength = headerSize + originalSize;
  1835. }
  1836. #endif
  1837. if (host->checksumCallback != NULL) {
  1838. enet_uint32* checksum = (enet_uint32*)&host->receivedData[headerSize - sizeof(enet_uint32)];
  1839. enet_uint32 desiredChecksum = *checksum;
  1840. ENetBuffer buffer;
  1841. *checksum = peer != NULL ? peer->connectID : 0;
  1842. buffer.data = host->receivedData;
  1843. buffer.dataLength = host->receivedDataLength;
  1844. if (host->checksumCallback(&buffer, 1) != desiredChecksum)
  1845. return 0;
  1846. }
  1847. if (peer != NULL) {
  1848. peer->address.ipv6 = host->receivedAddress.ipv6;
  1849. peer->address.port = host->receivedAddress.port;
  1850. peer->incomingDataTotal += host->receivedDataLength;
  1851. peer->totalDataReceived += host->receivedDataLength;
  1852. }
  1853. currentData = host->receivedData + headerSize;
  1854. while (currentData < &host->receivedData[host->receivedDataLength]) {
  1855. enet_uint8 commandNumber;
  1856. size_t commandSize;
  1857. command = (ENetProtocol*)currentData;
  1858. if (currentData + sizeof(ENetProtocolCommandHeader) > &host->receivedData[host->receivedDataLength])
  1859. break;
  1860. commandNumber = command->header.command & ENET_PROTOCOL_COMMAND_MASK;
  1861. if (commandNumber >= ENET_PROTOCOL_COMMAND_COUNT)
  1862. break;
  1863. commandSize = commandSizes[commandNumber];
  1864. if (commandSize == 0 || currentData + commandSize > &host->receivedData[host->receivedDataLength])
  1865. break;
  1866. currentData += commandSize;
  1867. if (peer == NULL && (commandNumber != ENET_PROTOCOL_COMMAND_CONNECT || currentData < &host->receivedData[host->receivedDataLength]))
  1868. break;
  1869. command->header.reliableSequenceNumber = ENET_NET_TO_HOST_16(command->header.reliableSequenceNumber);
  1870. switch (commandNumber) {
  1871. case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE:
  1872. if (enet_protocol_handle_acknowledge(host, event, peer, command))
  1873. goto commandError;
  1874. break;
  1875. case ENET_PROTOCOL_COMMAND_CONNECT:
  1876. if (peer != NULL)
  1877. goto commandError;
  1878. if (host->preventConnections == 0) {
  1879. peer = enet_protocol_handle_connect(host, header, command);
  1880. if (peer == NULL)
  1881. goto commandError;
  1882. }
  1883. break;
  1884. case ENET_PROTOCOL_COMMAND_VERIFY_CONNECT:
  1885. if (enet_protocol_handle_verify_connect(host, event, peer, command))
  1886. goto commandError;
  1887. break;
  1888. case ENET_PROTOCOL_COMMAND_DISCONNECT:
  1889. if (enet_protocol_handle_disconnect(host, peer, command))
  1890. goto commandError;
  1891. break;
  1892. case ENET_PROTOCOL_COMMAND_PING:
  1893. if (enet_protocol_handle_ping(host, peer, command))
  1894. goto commandError;
  1895. break;
  1896. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  1897. if (enet_protocol_handle_send_reliable(host, peer, command, &currentData))
  1898. goto commandError;
  1899. break;
  1900. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  1901. if (enet_protocol_handle_send_unreliable(host, peer, command, &currentData))
  1902. goto commandError;
  1903. break;
  1904. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  1905. if (enet_protocol_handle_send_unsequenced(host, peer, command, &currentData))
  1906. goto commandError;
  1907. break;
  1908. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  1909. if (enet_protocol_handle_send_fragment(host, peer, command, &currentData))
  1910. goto commandError;
  1911. break;
  1912. case ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT:
  1913. if (enet_protocol_handle_bandwidth_limit(host, peer, command))
  1914. goto commandError;
  1915. break;
  1916. case ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE:
  1917. if (enet_protocol_handle_throttle_configure(host, peer, command))
  1918. goto commandError;
  1919. break;
  1920. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  1921. if (enet_protocol_handle_send_unreliable_fragment(host, peer, command, &currentData))
  1922. goto commandError;
  1923. break;
  1924. default:
  1925. goto commandError;
  1926. }
  1927. if (peer != NULL && (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0) {
  1928. enet_uint16 sentTime;
  1929. if (!(flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME))
  1930. break;
  1931. sentTime = ENET_NET_TO_HOST_16(header->sentTime);
  1932. switch (peer->state) {
  1933. case ENET_PEER_STATE_DISCONNECTING:
  1934. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1935. case ENET_PEER_STATE_DISCONNECTED:
  1936. case ENET_PEER_STATE_ZOMBIE:
  1937. break;
  1938. case ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT:
  1939. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  1940. enet_peer_queue_acknowledgement(peer, command, sentTime);
  1941. break;
  1942. default:
  1943. enet_peer_queue_acknowledgement(peer, command, sentTime);
  1944. break;
  1945. }
  1946. }
  1947. }
  1948. commandError:
  1949. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  1950. return 1;
  1951. return 0;
  1952. }
  1953. static int enet_protocol_receive_incoming_commands(ENetHost* host, ENetEvent* event) {
  1954. int packets;
  1955. for (packets = 0; packets < 256; ++packets) {
  1956. int receivedLength;
  1957. ENetBuffer buffer;
  1958. buffer.data = host->packetData[0];
  1959. buffer.dataLength = host->mtu;
  1960. receivedLength = enet_socket_receive(host->socket, &host->receivedAddress, &buffer, 1);
  1961. if (receivedLength == -2)
  1962. continue;
  1963. if (receivedLength < 0)
  1964. return -1;
  1965. if (receivedLength == 0)
  1966. return 0;
  1967. host->receivedData = host->packetData[0];
  1968. host->receivedDataLength = receivedLength;
  1969. host->totalReceivedData += receivedLength;
  1970. host->totalReceivedPackets++;
  1971. if (host->interceptCallback != NULL) {
  1972. switch (host->interceptCallback(host, (void*)event)) {
  1973. case 1:
  1974. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  1975. return 1;
  1976. continue;
  1977. case -1:
  1978. return -1;
  1979. default:
  1980. break;
  1981. }
  1982. }
  1983. switch (enet_protocol_handle_incoming_commands(host, event)) {
  1984. case 1:
  1985. return 1;
  1986. case -1:
  1987. return -1;
  1988. default:
  1989. break;
  1990. }
  1991. }
  1992. return -1;
  1993. }
  1994. static void enet_protocol_send_acknowledgements(ENetHost* host, ENetPeer* peer) {
  1995. ENetProtocol* command = &host->commands[host->commandCount];
  1996. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  1997. ENetAcknowledgement* acknowledgement;
  1998. ENetListIterator currentAcknowledgement;
  1999. enet_uint16 reliableSequenceNumber;
  2000. currentAcknowledgement = enet_list_begin(&peer->acknowledgements);
  2001. while (currentAcknowledgement != enet_list_end(&peer->acknowledgements)) {
  2002. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < sizeof(ENetProtocolAcknowledge)) {
  2003. host->continueSending = 1;
  2004. break;
  2005. }
  2006. acknowledgement = (ENetAcknowledgement*)currentAcknowledgement;
  2007. currentAcknowledgement = enet_list_next(currentAcknowledgement);
  2008. buffer->data = command;
  2009. buffer->dataLength = sizeof(ENetProtocolAcknowledge);
  2010. host->packetSize += buffer->dataLength;
  2011. reliableSequenceNumber = ENET_HOST_TO_NET_16(acknowledgement->command.header.reliableSequenceNumber);
  2012. command->header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
  2013. command->header.channelID = acknowledgement->command.header.channelID;
  2014. command->header.reliableSequenceNumber = reliableSequenceNumber;
  2015. command->acknowledge.receivedReliableSequenceNumber = reliableSequenceNumber;
  2016. command->acknowledge.receivedSentTime = ENET_HOST_TO_NET_16(acknowledgement->sentTime);
  2017. if ((acknowledgement->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2018. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  2019. enet_list_remove(&acknowledgement->acknowledgementList);
  2020. enet_free(acknowledgement);
  2021. ++command;
  2022. ++buffer;
  2023. }
  2024. host->commandCount = command - host->commands;
  2025. host->bufferCount = buffer - host->buffers;
  2026. }
  2027. static void enet_protocol_send_unreliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2028. ENetProtocol* command = &host->commands[host->commandCount];
  2029. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2030. ENetOutgoingCommand* outgoingCommand;
  2031. ENetListIterator currentCommand;
  2032. currentCommand = enet_list_begin(&peer->outgoingUnreliableCommands);
  2033. while (currentCommand != enet_list_end(&peer->outgoingUnreliableCommands)) {
  2034. size_t commandSize;
  2035. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2036. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2037. 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)) {
  2038. host->continueSending = 1;
  2039. break;
  2040. }
  2041. currentCommand = enet_list_next(currentCommand);
  2042. if (outgoingCommand->packet != NULL && outgoingCommand->fragmentOffset == 0) {
  2043. peer->packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER;
  2044. peer->packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE;
  2045. if (peer->packetThrottleCounter > peer->packetThrottle) {
  2046. enet_uint16 reliableSequenceNumber = outgoingCommand->reliableSequenceNumber;
  2047. enet_uint16 unreliableSequenceNumber = outgoingCommand->unreliableSequenceNumber;
  2048. for (;;) {
  2049. --outgoingCommand->packet->referenceCount;
  2050. if (outgoingCommand->packet->referenceCount == 0)
  2051. enet_packet_destroy(outgoingCommand->packet);
  2052. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2053. enet_free(outgoingCommand);
  2054. if (currentCommand == enet_list_end(&peer->outgoingUnreliableCommands))
  2055. break;
  2056. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2057. if (outgoingCommand->reliableSequenceNumber != reliableSequenceNumber || outgoingCommand->unreliableSequenceNumber != unreliableSequenceNumber)
  2058. break;
  2059. currentCommand = enet_list_next(currentCommand);
  2060. }
  2061. continue;
  2062. }
  2063. }
  2064. buffer->data = command;
  2065. buffer->dataLength = commandSize;
  2066. host->packetSize += buffer->dataLength;
  2067. *command = outgoingCommand->command;
  2068. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2069. if (outgoingCommand->packet != NULL) {
  2070. ++buffer;
  2071. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2072. buffer->dataLength = outgoingCommand->fragmentLength;
  2073. host->packetSize += buffer->dataLength;
  2074. enet_list_insert(enet_list_end(&peer->sentUnreliableCommands), outgoingCommand);
  2075. } else {
  2076. enet_free(outgoingCommand);
  2077. }
  2078. ++command;
  2079. ++buffer;
  2080. }
  2081. host->commandCount = command - host->commands;
  2082. host->bufferCount = buffer - host->buffers;
  2083. 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))
  2084. enet_peer_disconnect(peer, peer->eventData);
  2085. }
  2086. static int enet_protocol_check_timeouts(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  2087. ENetOutgoingCommand* outgoingCommand;
  2088. ENetListIterator currentCommand, insertPosition;
  2089. currentCommand = enet_list_begin(&peer->sentReliableCommands);
  2090. insertPosition = enet_list_begin(&peer->outgoingReliableCommands);
  2091. while (currentCommand != enet_list_end(&peer->sentReliableCommands)) {
  2092. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2093. currentCommand = enet_list_next(currentCommand);
  2094. if (ENET_TIME_DIFFERENCE(host->serviceTime, outgoingCommand->sentTime) < outgoingCommand->roundTripTimeout)
  2095. continue;
  2096. if (peer->earliestTimeout == 0 || ENET_TIME_LESS(outgoingCommand->sentTime, peer->earliestTimeout))
  2097. peer->earliestTimeout = outgoingCommand->sentTime;
  2098. 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))) {
  2099. enet_protocol_notify_disconnect_timeout(host, peer, event);
  2100. return 1;
  2101. }
  2102. if (outgoingCommand->packet != NULL)
  2103. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  2104. ++peer->packetsLost;
  2105. ++peer->totalPacketsLost;
  2106. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2107. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2108. enet_list_insert(insertPosition, enet_list_remove(&outgoingCommand->outgoingCommandList));
  2109. if (currentCommand == enet_list_begin(&peer->sentReliableCommands) && !enet_list_empty(&peer->sentReliableCommands)) {
  2110. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2111. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  2112. }
  2113. }
  2114. return 0;
  2115. }
  2116. static int enet_protocol_send_reliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2117. ENetProtocol* command = &host->commands[host->commandCount];
  2118. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2119. ENetOutgoingCommand* outgoingCommand;
  2120. ENetListIterator currentCommand;
  2121. ENetChannel* channel;
  2122. enet_uint16 reliableWindow;
  2123. size_t commandSize;
  2124. int windowExceeded = 0, windowWrap = 0, canPing = 1;
  2125. currentCommand = enet_list_begin(&peer->outgoingReliableCommands);
  2126. while (currentCommand != enet_list_end(&peer->outgoingReliableCommands)) {
  2127. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2128. channel = outgoingCommand->command.header.channelID < peer->channelCount ? &peer->channels[outgoingCommand->command.header.channelID] : NULL;
  2129. reliableWindow = outgoingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2130. if (channel != NULL) {
  2131. 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)))))
  2132. windowWrap = 1;
  2133. if (windowWrap) {
  2134. currentCommand = enet_list_next(currentCommand);
  2135. continue;
  2136. }
  2137. }
  2138. if (outgoingCommand->packet != NULL) {
  2139. if (!windowExceeded) {
  2140. enet_uint32 windowSize = (peer->packetThrottle * peer->windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE;
  2141. if (peer->reliableDataInTransit + outgoingCommand->fragmentLength > ENET_MAX(windowSize, peer->mtu))
  2142. windowExceeded = 1;
  2143. }
  2144. if (windowExceeded) {
  2145. currentCommand = enet_list_next(currentCommand);
  2146. continue;
  2147. }
  2148. }
  2149. canPing = 0;
  2150. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2151. 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))) {
  2152. host->continueSending = 1;
  2153. break;
  2154. }
  2155. currentCommand = enet_list_next(currentCommand);
  2156. if (channel != NULL && outgoingCommand->sendAttempts < 1) {
  2157. channel->usedReliableWindows |= 1 << reliableWindow;
  2158. ++channel->reliableWindows[reliableWindow];
  2159. }
  2160. ++outgoingCommand->sendAttempts;
  2161. if (outgoingCommand->roundTripTimeout == 0) {
  2162. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2163. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2164. }
  2165. if (enet_list_empty(&peer->sentReliableCommands))
  2166. peer->nextTimeout = host->serviceTime + outgoingCommand->roundTripTimeout;
  2167. enet_list_insert(enet_list_end(&peer->sentReliableCommands), enet_list_remove(&outgoingCommand->outgoingCommandList));
  2168. outgoingCommand->sentTime = host->serviceTime;
  2169. buffer->data = command;
  2170. buffer->dataLength = commandSize;
  2171. host->packetSize += buffer->dataLength;
  2172. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_SENT_TIME;
  2173. *command = outgoingCommand->command;
  2174. if (outgoingCommand->packet != NULL) {
  2175. ++buffer;
  2176. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2177. buffer->dataLength = outgoingCommand->fragmentLength;
  2178. host->packetSize += outgoingCommand->fragmentLength;
  2179. peer->reliableDataInTransit += outgoingCommand->fragmentLength;
  2180. }
  2181. ++peer->packetsSent;
  2182. ++peer->totalPacketsSent;
  2183. ++command;
  2184. ++buffer;
  2185. }
  2186. host->commandCount = command - host->commands;
  2187. host->bufferCount = buffer - host->buffers;
  2188. return canPing;
  2189. }
  2190. static int enet_protocol_send_outgoing_commands(ENetHost* host, ENetEvent* event, int checkForTimeouts) {
  2191. enet_uint8 headerData[sizeof(ENetProtocolHeader) + sizeof(enet_uint32)];
  2192. ENetProtocolHeader* header = (ENetProtocolHeader*)headerData;
  2193. ENetPeer* currentPeer;
  2194. int sentLength;
  2195. host->continueSending = 1;
  2196. #ifdef ENET_LZ4
  2197. size_t shouldCompress = 0;
  2198. #endif
  2199. while (host->continueSending) {
  2200. for (host->continueSending = 0, currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2201. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED || currentPeer->state == ENET_PEER_STATE_ZOMBIE)
  2202. continue;
  2203. host->headerFlags = 0;
  2204. host->commandCount = 0;
  2205. host->bufferCount = 1;
  2206. host->packetSize = sizeof(ENetProtocolHeader);
  2207. if (!enet_list_empty(&currentPeer->acknowledgements))
  2208. enet_protocol_send_acknowledgements(host, currentPeer);
  2209. if (checkForTimeouts != 0 && !enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_GREATER_EQUAL(host->serviceTime, currentPeer->nextTimeout) && enet_protocol_check_timeouts(host, currentPeer, event) == 1) {
  2210. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2211. return 1;
  2212. else
  2213. continue;
  2214. }
  2215. 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)) {
  2216. enet_peer_ping(currentPeer);
  2217. enet_protocol_send_reliable_outgoing_commands(host, currentPeer);
  2218. }
  2219. if (!enet_list_empty(&currentPeer->outgoingUnreliableCommands))
  2220. enet_protocol_send_unreliable_outgoing_commands(host, currentPeer);
  2221. if (host->commandCount == 0)
  2222. continue;
  2223. if (currentPeer->packetLossEpoch == 0) {
  2224. currentPeer->packetLossEpoch = host->serviceTime;
  2225. } else if (ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->packetLossEpoch) >= ENET_PEER_PACKET_LOSS_INTERVAL && currentPeer->packetsSent > 0) {
  2226. enet_uint32 packetLoss = currentPeer->packetsLost * ENET_PEER_PACKET_LOSS_SCALE / currentPeer->packetsSent;
  2227. #ifdef ENET_DEBUG
  2228. printf(
  2229. "peer %u: %f%%+-%f%% packet loss, %u+-%u ms round trip time, %f%% throttle, %u/%u outgoing, %u/%u incoming\n", currentPeer->incomingPeerID,
  2230. currentPeer->packetLoss / (float)ENET_PEER_PACKET_LOSS_SCALE,
  2231. currentPeer->packetLossVariance / (float)ENET_PEER_PACKET_LOSS_SCALE, currentPeer->roundTripTime, currentPeer->roundTripTimeVariance,
  2232. currentPeer->packetThrottle / (float)ENET_PEER_PACKET_THROTTLE_SCALE,
  2233. enet_list_size(&currentPeer->outgoingReliableCommands),
  2234. enet_list_size(&currentPeer->outgoingUnreliableCommands),
  2235. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingReliableCommands) : 0,
  2236. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingUnreliableCommands) : 0
  2237. );
  2238. #endif
  2239. currentPeer->packetLossVariance -= currentPeer->packetLossVariance / 4;
  2240. if (packetLoss >= currentPeer->packetLoss) {
  2241. currentPeer->packetLoss += (packetLoss - currentPeer->packetLoss) / 8;
  2242. currentPeer->packetLossVariance += (packetLoss - currentPeer->packetLoss) / 4;
  2243. } else {
  2244. currentPeer->packetLoss -= (currentPeer->packetLoss - packetLoss) / 8;
  2245. currentPeer->packetLossVariance += (currentPeer->packetLoss - packetLoss) / 4;
  2246. }
  2247. currentPeer->packetLossEpoch = host->serviceTime;
  2248. currentPeer->packetsSent = 0;
  2249. currentPeer->packetsLost = 0;
  2250. }
  2251. host->buffers->data = headerData;
  2252. if (host->headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME) {
  2253. header->sentTime = ENET_HOST_TO_NET_16(host->serviceTime & 0xFFFF);
  2254. host->buffers->dataLength = sizeof(ENetProtocolHeader);
  2255. } else {
  2256. host->buffers->dataLength = (size_t)&((ENetProtocolHeader*)0)->sentTime;
  2257. }
  2258. #ifdef ENET_LZ4
  2259. if (host->compression == 1 && host->packetSize > 64) {
  2260. size_t originalSize = host->packetSize - sizeof(ENetProtocolHeader), compressedSize = 0;
  2261. const ENetBuffer* buffers = &host->buffers[1];
  2262. if (host->compressionBufferSize < originalSize) {
  2263. enet_free(host->compressionBuffer);
  2264. host->compressionBuffer = (char*)enet_malloc(originalSize);
  2265. host->compressionBufferSize = originalSize;
  2266. }
  2267. size_t totalSize = originalSize, dataSize = 0;
  2268. while (totalSize) {
  2269. size_t i;
  2270. for (i = 0; i < host->bufferCount - 1; i++) {
  2271. size_t copySize = ENET_MIN(totalSize, buffers[i].dataLength);
  2272. memcpy(host->compressionBuffer + dataSize, buffers[i].data, copySize);
  2273. totalSize -= copySize;
  2274. dataSize += copySize;
  2275. }
  2276. }
  2277. compressedSize = LZ4_compress_default((const char*)host->compressionBuffer, (char*)host->packetData[1], dataSize, originalSize);
  2278. if (compressedSize > 0 && compressedSize < originalSize) {
  2279. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_COMPRESSED;
  2280. shouldCompress = compressedSize;
  2281. #ifdef ENET_DEBUG
  2282. printf("peer %u: compressed %u->%u (%u%%)\n", currentPeer->incomingPeerID, originalSize, compressedSize, (compressedSize * 100) / originalSize);
  2283. #endif
  2284. }
  2285. }
  2286. #endif
  2287. if (currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2288. host->headerFlags |= currentPeer->outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  2289. header->peerID = ENET_HOST_TO_NET_16(currentPeer->outgoingPeerID | host->headerFlags);
  2290. if (host->checksumCallback != NULL) {
  2291. enet_uint32* checksum = (enet_uint32*)&headerData[host->buffers->dataLength];
  2292. *checksum = currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer->connectID : 0;
  2293. host->buffers->dataLength += sizeof(enet_uint32);
  2294. *checksum = host->checksumCallback(host->buffers, host->bufferCount);
  2295. }
  2296. #ifdef ENET_LZ4
  2297. if (shouldCompress > 0) {
  2298. host->buffers[1].data = host->packetData[1];
  2299. host->buffers[1].dataLength = shouldCompress;
  2300. host->bufferCount = 2;
  2301. }
  2302. #endif
  2303. currentPeer->lastSendTime = host->serviceTime;
  2304. sentLength = enet_socket_send(host->socket, &currentPeer->address, host->buffers, host->bufferCount);
  2305. enet_protocol_remove_sent_unreliable_commands(currentPeer);
  2306. if (sentLength < 0)
  2307. return -1;
  2308. host->totalSentData += sentLength;
  2309. currentPeer->totalDataSent += sentLength;
  2310. host->totalSentPackets++;
  2311. }
  2312. }
  2313. return 0;
  2314. }
  2315. void enet_host_flush(ENetHost* host) {
  2316. host->serviceTime = enet_time_get();
  2317. enet_protocol_send_outgoing_commands(host, NULL, 0);
  2318. }
  2319. int enet_host_check_events(ENetHost* host, ENetEvent* event) {
  2320. if (event == NULL)
  2321. return -1;
  2322. event->type = ENET_EVENT_TYPE_NONE;
  2323. event->peer = NULL;
  2324. event->packet = NULL;
  2325. return enet_protocol_dispatch_incoming_commands(host, event);
  2326. }
  2327. int enet_host_service(ENetHost* host, ENetEvent* event, enet_uint32 timeout) {
  2328. enet_uint32 waitCondition;
  2329. if (event != NULL) {
  2330. event->type = ENET_EVENT_TYPE_NONE;
  2331. event->peer = NULL;
  2332. event->packet = NULL;
  2333. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2334. case 1:
  2335. return 1;
  2336. case -1:
  2337. #ifdef ENET_DEBUG
  2338. perror("Error dispatching incoming packets");
  2339. #endif
  2340. return -1;
  2341. default:
  2342. break;
  2343. }
  2344. }
  2345. host->serviceTime = enet_time_get();
  2346. timeout += host->serviceTime;
  2347. do {
  2348. if (ENET_TIME_DIFFERENCE(host->serviceTime, host->bandwidthThrottleEpoch) >= ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  2349. enet_host_bandwidth_throttle(host);
  2350. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2351. case 1:
  2352. return 1;
  2353. case -1:
  2354. #ifdef ENET_DEBUG
  2355. perror("Error sending outgoing packets");
  2356. #endif
  2357. return -1;
  2358. default:
  2359. break;
  2360. }
  2361. switch (enet_protocol_receive_incoming_commands(host, event)) {
  2362. case 1:
  2363. return 1;
  2364. case -1:
  2365. #ifdef ENET_DEBUG
  2366. perror("Error receiving incoming packets");
  2367. #endif
  2368. return -1;
  2369. default:
  2370. break;
  2371. }
  2372. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2373. case 1:
  2374. return 1;
  2375. case -1:
  2376. #ifdef ENET_DEBUG
  2377. perror("Error sending outgoing packets");
  2378. #endif
  2379. return -1;
  2380. default:
  2381. break;
  2382. }
  2383. if (event != NULL) {
  2384. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2385. case 1:
  2386. return 1;
  2387. case -1:
  2388. #ifdef ENET_DEBUG
  2389. perror("Error dispatching incoming packets");
  2390. #endif
  2391. return -1;
  2392. default:
  2393. break;
  2394. }
  2395. }
  2396. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2397. return 0;
  2398. do {
  2399. host->serviceTime = enet_time_get();
  2400. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2401. return 0;
  2402. waitCondition = ENET_SOCKET_WAIT_RECEIVE | ENET_SOCKET_WAIT_INTERRUPT;
  2403. if (enet_socket_wait(host->socket, &waitCondition, ENET_TIME_DIFFERENCE(timeout, host->serviceTime)) != 0)
  2404. return -1;
  2405. }
  2406. while (waitCondition & ENET_SOCKET_WAIT_INTERRUPT);
  2407. host->serviceTime = enet_time_get();
  2408. }
  2409. while (waitCondition & ENET_SOCKET_WAIT_RECEIVE);
  2410. return 0;
  2411. }
  2412. /*
  2413. =======================================================================
  2414. Peer
  2415. =======================================================================
  2416. */
  2417. void enet_peer_throttle_configure(ENetPeer* peer, enet_uint32 interval, enet_uint32 acceleration, enet_uint32 deceleration, enet_uint32 threshold) {
  2418. ENetProtocol command;
  2419. peer->packetThrottleThreshold = threshold;
  2420. peer->packetThrottleInterval = interval;
  2421. peer->packetThrottleAcceleration = acceleration;
  2422. peer->packetThrottleDeceleration = deceleration;
  2423. command.header.command = ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2424. command.header.channelID = 0xFF;
  2425. command.throttleConfigure.packetThrottleInterval = ENET_HOST_TO_NET_32(interval);
  2426. command.throttleConfigure.packetThrottleAcceleration = ENET_HOST_TO_NET_32(acceleration);
  2427. command.throttleConfigure.packetThrottleDeceleration = ENET_HOST_TO_NET_32(deceleration);
  2428. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2429. }
  2430. int enet_peer_throttle(ENetPeer* peer, enet_uint32 rtt) {
  2431. if (peer->lastRoundTripTime <= peer->lastRoundTripTimeVariance) {
  2432. peer->packetThrottle = peer->packetThrottleLimit;
  2433. } else if (rtt < peer->lastRoundTripTime) {
  2434. peer->packetThrottle += peer->packetThrottleAcceleration;
  2435. if (peer->packetThrottle > peer->packetThrottleLimit)
  2436. peer->packetThrottle = peer->packetThrottleLimit;
  2437. return 1;
  2438. } else if (rtt > peer->lastRoundTripTime + peer->packetThrottleThreshold + 2 * peer->lastRoundTripTimeVariance) {
  2439. if (peer->packetThrottle > peer->packetThrottleDeceleration)
  2440. peer->packetThrottle -= peer->packetThrottleDeceleration;
  2441. else
  2442. peer->packetThrottle = 0;
  2443. return -1;
  2444. }
  2445. return 0;
  2446. }
  2447. int enet_peer_send(ENetPeer* peer, enet_uint8 channelID, ENetPacket* packet) {
  2448. ENetChannel* channel = &peer->channels[channelID];
  2449. ENetProtocol command;
  2450. size_t fragmentLength;
  2451. if (peer->state != ENET_PEER_STATE_CONNECTED || channelID >= peer->channelCount || packet->dataLength > peer->host->maximumPacketSize)
  2452. return -1;
  2453. fragmentLength = peer->mtu - sizeof(ENetProtocolHeader) - sizeof(ENetProtocolSendFragment);
  2454. if (peer->host->checksumCallback != NULL)
  2455. fragmentLength -= sizeof(enet_uint32);
  2456. if (packet->dataLength > fragmentLength) {
  2457. enet_uint32 fragmentCount = (packet->dataLength + fragmentLength - 1) / fragmentLength, fragmentNumber, fragmentOffset;
  2458. enet_uint8 commandNumber;
  2459. enet_uint16 startSequenceNumber;
  2460. ENetList fragments;
  2461. ENetOutgoingCommand* fragment;
  2462. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2463. return -1;
  2464. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED)) == ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED && channel->outgoingUnreliableSequenceNumber < 0xFFFF) {
  2465. commandNumber = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT;
  2466. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingUnreliableSequenceNumber + 1);
  2467. } else {
  2468. commandNumber = ENET_PROTOCOL_COMMAND_SEND_FRAGMENT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2469. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingReliableSequenceNumber + 1);
  2470. }
  2471. enet_list_clear(&fragments);
  2472. for (fragmentNumber = 0, fragmentOffset = 0; fragmentOffset < packet->dataLength; ++fragmentNumber, fragmentOffset += fragmentLength) {
  2473. if (packet->dataLength - fragmentOffset < fragmentLength)
  2474. fragmentLength = packet->dataLength - fragmentOffset;
  2475. fragment = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2476. if (fragment == NULL) {
  2477. while (!enet_list_empty(&fragments)) {
  2478. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2479. enet_free(fragment);
  2480. }
  2481. return -1;
  2482. }
  2483. fragment->fragmentOffset = fragmentOffset;
  2484. fragment->fragmentLength = fragmentLength;
  2485. fragment->packet = packet;
  2486. fragment->command.header.command = commandNumber;
  2487. fragment->command.header.channelID = channelID;
  2488. fragment->command.sendFragment.startSequenceNumber = startSequenceNumber;
  2489. fragment->command.sendFragment.dataLength = ENET_HOST_TO_NET_16(fragmentLength);
  2490. fragment->command.sendFragment.fragmentCount = ENET_HOST_TO_NET_32(fragmentCount);
  2491. fragment->command.sendFragment.fragmentNumber = ENET_HOST_TO_NET_32(fragmentNumber);
  2492. fragment->command.sendFragment.totalLength = ENET_HOST_TO_NET_32(packet->dataLength);
  2493. fragment->command.sendFragment.fragmentOffset = ENET_NET_TO_HOST_32(fragmentOffset);
  2494. enet_list_insert(enet_list_end(&fragments), fragment);
  2495. }
  2496. packet->referenceCount += fragmentNumber;
  2497. while (!enet_list_empty(&fragments)) {
  2498. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2499. enet_peer_setup_outgoing_command(peer, fragment);
  2500. }
  2501. return 0;
  2502. }
  2503. command.header.channelID = channelID;
  2504. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNSEQUENCED)) == ENET_PACKET_FLAG_UNSEQUENCED) {
  2505. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2506. command.sendUnsequenced.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2507. } else if (packet->flags & ENET_PACKET_FLAG_RELIABLE || channel->outgoingUnreliableSequenceNumber >= 0xFFFF) {
  2508. command.header.command = ENET_PROTOCOL_COMMAND_SEND_RELIABLE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2509. command.sendReliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2510. } else {
  2511. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE;
  2512. command.sendUnreliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2513. }
  2514. if (enet_peer_queue_outgoing_command(peer, &command, packet, 0, packet->dataLength) == NULL)
  2515. return -1;
  2516. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  2517. enet_host_flush(peer->host);
  2518. return 0;
  2519. }
  2520. ENetPacket* enet_peer_receive(ENetPeer* peer, enet_uint8* channelID) {
  2521. ENetIncomingCommand* incomingCommand;
  2522. ENetPacket* packet;
  2523. if (enet_list_empty(&peer->dispatchedCommands))
  2524. return NULL;
  2525. incomingCommand = (ENetIncomingCommand*)enet_list_remove(enet_list_begin(&peer->dispatchedCommands));
  2526. if (channelID != NULL)
  2527. *channelID = incomingCommand->command.header.channelID;
  2528. packet = incomingCommand->packet;
  2529. --packet->referenceCount;
  2530. if (incomingCommand->fragments != NULL)
  2531. enet_free(incomingCommand->fragments);
  2532. enet_free(incomingCommand);
  2533. peer->totalWaitingData -= packet->dataLength;
  2534. return packet;
  2535. }
  2536. static void enet_peer_reset_outgoing_commands(ENetList* queue) {
  2537. ENetOutgoingCommand* outgoingCommand;
  2538. while (!enet_list_empty(queue)) {
  2539. outgoingCommand = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(queue));
  2540. if (outgoingCommand->packet != NULL) {
  2541. --outgoingCommand->packet->referenceCount;
  2542. if (outgoingCommand->packet->referenceCount == 0)
  2543. enet_packet_destroy(outgoingCommand->packet);
  2544. }
  2545. enet_free(outgoingCommand);
  2546. }
  2547. }
  2548. static void enet_peer_remove_incoming_commands(ENetList* queue, ENetListIterator startCommand, ENetListIterator endCommand) {
  2549. ENetListIterator currentCommand;
  2550. for (currentCommand = startCommand; currentCommand != endCommand;) {
  2551. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2552. currentCommand = enet_list_next(currentCommand);
  2553. enet_list_remove(&incomingCommand->incomingCommandList);
  2554. if (incomingCommand->packet != NULL) {
  2555. --incomingCommand->packet->referenceCount;
  2556. if (incomingCommand->packet->referenceCount == 0)
  2557. enet_packet_destroy(incomingCommand->packet);
  2558. }
  2559. if (incomingCommand->fragments != NULL)
  2560. enet_free(incomingCommand->fragments);
  2561. enet_free(incomingCommand);
  2562. }
  2563. }
  2564. static void enet_peer_reset_incoming_commands(ENetList* queue) {
  2565. enet_peer_remove_incoming_commands(queue, enet_list_begin(queue), enet_list_end(queue));
  2566. }
  2567. void enet_peer_reset_queues(ENetPeer* peer) {
  2568. ENetChannel* channel;
  2569. if (peer->needsDispatch) {
  2570. enet_list_remove(&peer->dispatchList);
  2571. peer->needsDispatch = 0;
  2572. }
  2573. while (!enet_list_empty(&peer->acknowledgements)) {
  2574. enet_free(enet_list_remove(enet_list_begin(&peer->acknowledgements)));
  2575. }
  2576. enet_peer_reset_outgoing_commands(&peer->sentReliableCommands);
  2577. enet_peer_reset_outgoing_commands(&peer->sentUnreliableCommands);
  2578. enet_peer_reset_outgoing_commands(&peer->outgoingReliableCommands);
  2579. enet_peer_reset_outgoing_commands(&peer->outgoingUnreliableCommands);
  2580. enet_peer_reset_incoming_commands(&peer->dispatchedCommands);
  2581. if (peer->channels != NULL && peer->channelCount > 0) {
  2582. for (channel = peer->channels; channel < &peer->channels[peer->channelCount]; ++channel) {
  2583. enet_peer_reset_incoming_commands(&channel->incomingReliableCommands);
  2584. enet_peer_reset_incoming_commands(&channel->incomingUnreliableCommands);
  2585. }
  2586. enet_free(peer->channels);
  2587. }
  2588. peer->channels = NULL;
  2589. peer->channelCount = 0;
  2590. }
  2591. void enet_peer_on_connect(ENetPeer* peer) {
  2592. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  2593. if (peer->incomingBandwidth != 0)
  2594. ++peer->host->bandwidthLimitedPeers;
  2595. ++peer->host->connectedPeers;
  2596. }
  2597. }
  2598. void enet_peer_on_disconnect(ENetPeer* peer) {
  2599. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2600. if (peer->incomingBandwidth != 0)
  2601. --peer->host->bandwidthLimitedPeers;
  2602. --peer->host->connectedPeers;
  2603. }
  2604. }
  2605. void enet_peer_reset(ENetPeer* peer) {
  2606. enet_peer_on_disconnect(peer);
  2607. peer->outgoingPeerID = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  2608. peer->state = ENET_PEER_STATE_DISCONNECTED;
  2609. peer->incomingBandwidth = 0;
  2610. peer->outgoingBandwidth = 0;
  2611. peer->incomingBandwidthThrottleEpoch = 0;
  2612. peer->outgoingBandwidthThrottleEpoch = 0;
  2613. peer->incomingDataTotal = 0;
  2614. peer->totalDataReceived = 0;
  2615. peer->outgoingDataTotal = 0;
  2616. peer->totalDataSent = 0;
  2617. peer->lastSendTime = 0;
  2618. peer->lastReceiveTime = 0;
  2619. peer->nextTimeout = 0;
  2620. peer->earliestTimeout = 0;
  2621. peer->packetLossEpoch = 0;
  2622. peer->packetsSent = 0;
  2623. peer->totalPacketsSent = 0;
  2624. peer->packetsLost = 0;
  2625. peer->totalPacketsLost = 0;
  2626. peer->packetLoss = 0;
  2627. peer->packetLossVariance = 0;
  2628. peer->packetThrottle = ENET_PEER_DEFAULT_PACKET_THROTTLE;
  2629. peer->packetThrottleLimit = ENET_PEER_PACKET_THROTTLE_SCALE;
  2630. peer->packetThrottleCounter = 0;
  2631. peer->packetThrottleEpoch = 0;
  2632. peer->packetThrottleAcceleration = ENET_PEER_PACKET_THROTTLE_ACCELERATION;
  2633. peer->packetThrottleDeceleration = ENET_PEER_PACKET_THROTTLE_DECELERATION;
  2634. peer->packetThrottleInterval = ENET_PEER_PACKET_THROTTLE_INTERVAL;
  2635. peer->pingInterval = ENET_PEER_PING_INTERVAL;
  2636. peer->timeoutLimit = ENET_PEER_TIMEOUT_LIMIT;
  2637. peer->timeoutMinimum = ENET_PEER_TIMEOUT_MINIMUM;
  2638. peer->timeoutMaximum = ENET_PEER_TIMEOUT_MAXIMUM;
  2639. peer->smoothedRoundTripTime = 0;
  2640. peer->lastRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2641. peer->lowestRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2642. peer->lastRoundTripTimeVariance = 0;
  2643. peer->highestRoundTripTimeVariance = 0;
  2644. peer->roundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2645. peer->roundTripTimeVariance = 0;
  2646. peer->mtu = peer->host->mtu;
  2647. peer->reliableDataInTransit = 0;
  2648. peer->outgoingReliableSequenceNumber = 0;
  2649. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  2650. peer->incomingUnsequencedGroup = 0;
  2651. peer->outgoingUnsequencedGroup = 0;
  2652. peer->eventData = 0;
  2653. peer->totalWaitingData = 0;
  2654. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  2655. enet_peer_reset_queues(peer);
  2656. }
  2657. void enet_peer_ping(ENetPeer* peer) {
  2658. ENetProtocol command;
  2659. if (peer->state != ENET_PEER_STATE_CONNECTED)
  2660. return;
  2661. command.header.command = ENET_PROTOCOL_COMMAND_PING | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2662. command.header.channelID = 0xFF;
  2663. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2664. }
  2665. void enet_peer_ping_interval(ENetPeer* peer, enet_uint32 pingInterval) {
  2666. peer->pingInterval = pingInterval ? pingInterval : ENET_PEER_PING_INTERVAL;
  2667. }
  2668. void enet_peer_timeout(ENetPeer* peer, enet_uint32 timeoutLimit, enet_uint32 timeoutMinimum, enet_uint32 timeoutMaximum) {
  2669. peer->timeoutLimit = timeoutLimit ? timeoutLimit : ENET_PEER_TIMEOUT_LIMIT;
  2670. peer->timeoutMinimum = timeoutMinimum ? timeoutMinimum : ENET_PEER_TIMEOUT_MINIMUM;
  2671. peer->timeoutMaximum = timeoutMaximum ? timeoutMaximum : ENET_PEER_TIMEOUT_MAXIMUM;
  2672. }
  2673. void enet_peer_disconnect_now(ENetPeer* peer, enet_uint32 data) {
  2674. ENetProtocol command;
  2675. if (peer->state == ENET_PEER_STATE_DISCONNECTED)
  2676. return;
  2677. if (peer->state != ENET_PEER_STATE_ZOMBIE && peer->state != ENET_PEER_STATE_DISCONNECTING) {
  2678. enet_peer_reset_queues(peer);
  2679. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2680. command.header.channelID = 0xFF;
  2681. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2682. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2683. enet_host_flush(peer->host);
  2684. }
  2685. enet_peer_reset(peer);
  2686. }
  2687. void enet_peer_disconnect(ENetPeer* peer, enet_uint32 data) {
  2688. ENetProtocol command;
  2689. if (peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT || peer->state == ENET_PEER_STATE_ZOMBIE)
  2690. return;
  2691. enet_peer_reset_queues(peer);
  2692. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT;
  2693. command.header.channelID = 0xFF;
  2694. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2695. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2696. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2697. else
  2698. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2699. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2700. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2701. enet_peer_on_disconnect(peer);
  2702. peer->state = ENET_PEER_STATE_DISCONNECTING;
  2703. } else {
  2704. enet_host_flush(peer->host);
  2705. enet_peer_reset(peer);
  2706. }
  2707. }
  2708. void enet_peer_disconnect_later(ENetPeer* peer, enet_uint32 data) {
  2709. if ((peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) && !(enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))) {
  2710. peer->state = ENET_PEER_STATE_DISCONNECT_LATER;
  2711. peer->eventData = data;
  2712. } else {
  2713. enet_peer_disconnect(peer, data);
  2714. }
  2715. }
  2716. ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer* peer, const ENetProtocol* command, enet_uint16 sentTime) {
  2717. ENetAcknowledgement* acknowledgement;
  2718. if (command->header.channelID < peer->channelCount) {
  2719. ENetChannel* channel = &peer->channels[command->header.channelID];
  2720. enet_uint16 reliableWindow = command->header.reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2721. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2722. if (command->header.reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2723. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2724. if (reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1 && reliableWindow <= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS)
  2725. return NULL;
  2726. }
  2727. acknowledgement = (ENetAcknowledgement*)enet_malloc(sizeof(ENetAcknowledgement));
  2728. if (acknowledgement == NULL)
  2729. return NULL;
  2730. peer->outgoingDataTotal += sizeof(ENetProtocolAcknowledge);
  2731. acknowledgement->sentTime = sentTime;
  2732. acknowledgement->command = *command;
  2733. enet_list_insert(enet_list_end(&peer->acknowledgements), acknowledgement);
  2734. return acknowledgement;
  2735. }
  2736. void enet_peer_setup_outgoing_command(ENetPeer* peer, ENetOutgoingCommand* outgoingCommand) {
  2737. ENetChannel* channel = &peer->channels[outgoingCommand->command.header.channelID];
  2738. peer->outgoingDataTotal += enet_protocol_command_size(outgoingCommand->command.header.command) + outgoingCommand->fragmentLength;
  2739. if (outgoingCommand->command.header.channelID == 0xFF) {
  2740. ++peer->outgoingReliableSequenceNumber;
  2741. outgoingCommand->reliableSequenceNumber = peer->outgoingReliableSequenceNumber;
  2742. outgoingCommand->unreliableSequenceNumber = 0;
  2743. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2744. ++channel->outgoingReliableSequenceNumber;
  2745. channel->outgoingUnreliableSequenceNumber = 0;
  2746. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2747. outgoingCommand->unreliableSequenceNumber = 0;
  2748. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED) {
  2749. ++peer->outgoingUnsequencedGroup;
  2750. outgoingCommand->reliableSequenceNumber = 0;
  2751. outgoingCommand->unreliableSequenceNumber = 0;
  2752. } else {
  2753. if (outgoingCommand->fragmentOffset == 0)
  2754. ++channel->outgoingUnreliableSequenceNumber;
  2755. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2756. outgoingCommand->unreliableSequenceNumber = channel->outgoingUnreliableSequenceNumber;
  2757. }
  2758. outgoingCommand->sendAttempts = 0;
  2759. outgoingCommand->sentTime = 0;
  2760. outgoingCommand->roundTripTimeout = 0;
  2761. outgoingCommand->roundTripTimeoutLimit = 0;
  2762. outgoingCommand->command.header.reliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->reliableSequenceNumber);
  2763. switch (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2764. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2765. outgoingCommand->command.sendUnreliable.unreliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->unreliableSequenceNumber);
  2766. break;
  2767. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2768. outgoingCommand->command.sendUnsequenced.unsequencedGroup = ENET_HOST_TO_NET_16(peer->outgoingUnsequencedGroup);
  2769. break;
  2770. default:
  2771. break;
  2772. }
  2773. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)
  2774. enet_list_insert(enet_list_end(&peer->outgoingReliableCommands), outgoingCommand);
  2775. else
  2776. enet_list_insert(enet_list_end(&peer->outgoingUnreliableCommands), outgoingCommand);
  2777. }
  2778. ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer* peer, const ENetProtocol* command, ENetPacket* packet, enet_uint32 offset, enet_uint16 length) {
  2779. ENetOutgoingCommand* outgoingCommand = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2780. if (outgoingCommand == NULL)
  2781. return NULL;
  2782. outgoingCommand->command = *command;
  2783. outgoingCommand->fragmentOffset = offset;
  2784. outgoingCommand->fragmentLength = length;
  2785. outgoingCommand->packet = packet;
  2786. if (packet != NULL)
  2787. ++packet->referenceCount;
  2788. enet_peer_setup_outgoing_command(peer, outgoingCommand);
  2789. return outgoingCommand;
  2790. }
  2791. void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2792. ENetListIterator droppedCommand, startCommand, currentCommand;
  2793. for (droppedCommand = startCommand = currentCommand = enet_list_begin(&channel->incomingUnreliableCommands); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2794. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2795. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2796. continue;
  2797. if (incomingCommand->reliableSequenceNumber == channel->incomingReliableSequenceNumber) {
  2798. if (incomingCommand->fragmentsRemaining <= 0) {
  2799. channel->incomingUnreliableSequenceNumber = incomingCommand->unreliableSequenceNumber;
  2800. continue;
  2801. }
  2802. if (startCommand != currentCommand) {
  2803. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2804. if (!peer->needsDispatch) {
  2805. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2806. peer->needsDispatch = 1;
  2807. }
  2808. droppedCommand = currentCommand;
  2809. } else if (droppedCommand != currentCommand) {
  2810. droppedCommand = enet_list_previous(currentCommand);
  2811. }
  2812. } else {
  2813. enet_uint16 reliableWindow = incomingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2814. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2815. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2816. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2817. if (reliableWindow >= currentWindow && reliableWindow < currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2818. break;
  2819. droppedCommand = enet_list_next(currentCommand);
  2820. if (startCommand != currentCommand) {
  2821. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2822. if (!peer->needsDispatch) {
  2823. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2824. peer->needsDispatch = 1;
  2825. }
  2826. }
  2827. }
  2828. startCommand = enet_list_next(currentCommand);
  2829. }
  2830. if (startCommand != currentCommand) {
  2831. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2832. if (!peer->needsDispatch) {
  2833. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2834. peer->needsDispatch = 1;
  2835. }
  2836. droppedCommand = currentCommand;
  2837. }
  2838. enet_peer_remove_incoming_commands(&channel->incomingUnreliableCommands, enet_list_begin(&channel->incomingUnreliableCommands), droppedCommand);
  2839. }
  2840. void enet_peer_dispatch_incoming_reliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2841. ENetListIterator currentCommand;
  2842. for (currentCommand = enet_list_begin(&channel->incomingReliableCommands); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2843. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2844. if (incomingCommand->fragmentsRemaining > 0 || incomingCommand->reliableSequenceNumber != (enet_uint16)(channel->incomingReliableSequenceNumber + 1))
  2845. break;
  2846. channel->incomingReliableSequenceNumber = incomingCommand->reliableSequenceNumber;
  2847. if (incomingCommand->fragmentCount > 0)
  2848. channel->incomingReliableSequenceNumber += incomingCommand->fragmentCount - 1;
  2849. }
  2850. if (currentCommand == enet_list_begin(&channel->incomingReliableCommands))
  2851. return;
  2852. channel->incomingUnreliableSequenceNumber = 0;
  2853. enet_list_move(enet_list_end(&peer->dispatchedCommands), enet_list_begin(&channel->incomingReliableCommands), enet_list_previous(currentCommand));
  2854. if (!peer->needsDispatch) {
  2855. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2856. peer->needsDispatch = 1;
  2857. }
  2858. if (!enet_list_empty(&channel->incomingUnreliableCommands))
  2859. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2860. }
  2861. ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer* peer, const ENetProtocol* command, const void* data, size_t dataLength, enet_uint32 flags, enet_uint32 fragmentCount) {
  2862. static ENetIncomingCommand dummyCommand;
  2863. ENetChannel* channel = &peer->channels[command->header.channelID];
  2864. enet_uint32 unreliableSequenceNumber = 0, reliableSequenceNumber = 0;
  2865. enet_uint16 reliableWindow, currentWindow;
  2866. ENetIncomingCommand* incomingCommand;
  2867. ENetListIterator currentCommand;
  2868. ENetPacket* packet = NULL;
  2869. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2870. goto discardCommand;
  2871. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) {
  2872. reliableSequenceNumber = command->header.reliableSequenceNumber;
  2873. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2874. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2875. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2876. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2877. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2878. goto discardCommand;
  2879. }
  2880. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2881. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2882. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2883. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber)
  2884. goto discardCommand;
  2885. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2886. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2887. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2888. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2889. continue;
  2890. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2891. break;
  2892. }
  2893. if (incomingCommand->reliableSequenceNumber <= reliableSequenceNumber) {
  2894. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2895. break;
  2896. goto discardCommand;
  2897. }
  2898. }
  2899. break;
  2900. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2901. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  2902. unreliableSequenceNumber = ENET_NET_TO_HOST_16(command->sendUnreliable.unreliableSequenceNumber);
  2903. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && unreliableSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  2904. goto discardCommand;
  2905. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2906. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2907. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2908. continue;
  2909. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2910. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2911. continue;
  2912. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2913. break;
  2914. }
  2915. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2916. break;
  2917. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  2918. continue;
  2919. if (incomingCommand->unreliableSequenceNumber <= unreliableSequenceNumber) {
  2920. if (incomingCommand->unreliableSequenceNumber < unreliableSequenceNumber)
  2921. break;
  2922. goto discardCommand;
  2923. }
  2924. }
  2925. break;
  2926. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2927. currentCommand = enet_list_end(&channel->incomingUnreliableCommands);
  2928. break;
  2929. default:
  2930. goto discardCommand;
  2931. }
  2932. if (peer->totalWaitingData >= peer->host->maximumWaitingData)
  2933. goto notifyError;
  2934. packet = enet_packet_create(data, dataLength, flags);
  2935. if (packet == NULL)
  2936. goto notifyError;
  2937. incomingCommand = (ENetIncomingCommand*)enet_malloc(sizeof(ENetIncomingCommand));
  2938. if (incomingCommand == NULL)
  2939. goto notifyError;
  2940. incomingCommand->reliableSequenceNumber = command->header.reliableSequenceNumber;
  2941. incomingCommand->unreliableSequenceNumber = unreliableSequenceNumber & 0xFFFF;
  2942. incomingCommand->command = *command;
  2943. incomingCommand->fragmentCount = fragmentCount;
  2944. incomingCommand->fragmentsRemaining = fragmentCount;
  2945. incomingCommand->packet = packet;
  2946. incomingCommand->fragments = NULL;
  2947. if (fragmentCount > 0) {
  2948. if (fragmentCount <= ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2949. incomingCommand->fragments = (enet_uint32*)enet_malloc((fragmentCount + 31) / 32 * sizeof(enet_uint32));
  2950. if (incomingCommand->fragments == NULL) {
  2951. enet_free(incomingCommand);
  2952. goto notifyError;
  2953. }
  2954. memset(incomingCommand->fragments, 0, (fragmentCount + 31) / 32 * sizeof(enet_uint32));
  2955. }
  2956. if (packet != NULL) {
  2957. ++packet->referenceCount;
  2958. peer->totalWaitingData += packet->dataLength;
  2959. }
  2960. enet_list_insert(enet_list_next(currentCommand), incomingCommand);
  2961. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2962. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2963. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2964. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  2965. break;
  2966. default:
  2967. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2968. break;
  2969. }
  2970. return incomingCommand;
  2971. discardCommand:
  2972. if (fragmentCount > 0)
  2973. goto notifyError;
  2974. if (packet != NULL && packet->referenceCount == 0)
  2975. enet_packet_destroy(packet);
  2976. return &dummyCommand;
  2977. notifyError:
  2978. if (packet != NULL && packet->referenceCount == 0)
  2979. enet_packet_destroy(packet);
  2980. return NULL;
  2981. }
  2982. /*
  2983. =======================================================================
  2984. Host
  2985. =======================================================================
  2986. */
  2987. ENetHost* enet_host_create(const ENetAddress* address, size_t peerCount, size_t channelLimit, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth, int bufferSize) {
  2988. ENetHost* host;
  2989. ENetPeer* currentPeer;
  2990. if (peerCount > ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2991. return NULL;
  2992. host = (ENetHost*)enet_malloc(sizeof(ENetHost));
  2993. if (host == NULL)
  2994. return NULL;
  2995. memset(host, 0, sizeof(ENetHost));
  2996. host->peers = (ENetPeer*)enet_malloc(peerCount * sizeof(ENetPeer));
  2997. if (host->peers == NULL) {
  2998. enet_free(host);
  2999. return NULL;
  3000. }
  3001. memset(host->peers, 0, peerCount * sizeof(ENetPeer));
  3002. host->socket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
  3003. if (host->socket != ENET_SOCKET_NULL)
  3004. enet_socket_set_option(host->socket, ENET_SOCKOPT_IPV6_V6ONLY, 0);
  3005. if (host->socket == ENET_SOCKET_NULL || (address != NULL && enet_socket_bind(host->socket, address) < 0)) {
  3006. if (host->socket != ENET_SOCKET_NULL)
  3007. enet_socket_destroy(host->socket);
  3008. enet_free(host->peers);
  3009. enet_free(host);
  3010. return NULL;
  3011. }
  3012. if (bufferSize > ENET_HOST_BUFFER_SIZE_MAX)
  3013. bufferSize = ENET_HOST_BUFFER_SIZE_MAX;
  3014. else if (bufferSize < ENET_HOST_BUFFER_SIZE_MIN)
  3015. bufferSize = ENET_HOST_BUFFER_SIZE_MIN;
  3016. enet_socket_set_option(host->socket, ENET_SOCKOPT_NONBLOCK, 1);
  3017. enet_socket_set_option(host->socket, ENET_SOCKOPT_BROADCAST, 1);
  3018. enet_socket_set_option(host->socket, ENET_SOCKOPT_RCVBUF, bufferSize);
  3019. enet_socket_set_option(host->socket, ENET_SOCKOPT_SNDBUF, bufferSize);
  3020. if (address != NULL && enet_socket_get_address(host->socket, &host->address) < 0)
  3021. host->address = *address;
  3022. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3023. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3024. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3025. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3026. host->randomSeed = (enet_uint32)(size_t)host;
  3027. host->randomSeed += enet_host_random_seed();
  3028. host->randomSeed = (host->randomSeed << 16) | (host->randomSeed >> 16);
  3029. host->channelLimit = channelLimit;
  3030. host->incomingBandwidth = incomingBandwidth;
  3031. host->outgoingBandwidth = outgoingBandwidth;
  3032. host->bandwidthThrottleEpoch = 0;
  3033. host->recalculateBandwidthLimits = 0;
  3034. host->preventConnections = 0;
  3035. host->mtu = ENET_HOST_DEFAULT_MTU;
  3036. host->peerCount = peerCount;
  3037. host->commandCount = 0;
  3038. host->bufferCount = 0;
  3039. host->compression = 0;
  3040. host->compressionBufferSize = 0;
  3041. host->checksumCallback = NULL;
  3042. host->receivedAddress.ipv6 = ENET_HOST_ANY;
  3043. host->receivedAddress.port = 0;
  3044. host->receivedData = NULL;
  3045. host->receivedDataLength = 0;
  3046. host->totalSentData = 0;
  3047. host->totalSentPackets = 0;
  3048. host->totalReceivedData = 0;
  3049. host->totalReceivedPackets = 0;
  3050. host->connectedPeers = 0;
  3051. host->bandwidthLimitedPeers = 0;
  3052. host->duplicatePeers = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  3053. host->maximumPacketSize = ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE;
  3054. host->maximumWaitingData = ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA;
  3055. host->interceptCallback = NULL;
  3056. enet_list_clear(&host->dispatchQueue);
  3057. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3058. currentPeer->host = host;
  3059. currentPeer->incomingPeerID = currentPeer - host->peers;
  3060. currentPeer->outgoingSessionID = currentPeer->incomingSessionID = 0xFF;
  3061. currentPeer->data = NULL;
  3062. enet_list_clear(&currentPeer->acknowledgements);
  3063. enet_list_clear(&currentPeer->sentReliableCommands);
  3064. enet_list_clear(&currentPeer->sentUnreliableCommands);
  3065. enet_list_clear(&currentPeer->outgoingReliableCommands);
  3066. enet_list_clear(&currentPeer->outgoingUnreliableCommands);
  3067. enet_list_clear(&currentPeer->dispatchedCommands);
  3068. enet_peer_reset(currentPeer);
  3069. }
  3070. return host;
  3071. }
  3072. void enet_host_destroy(ENetHost* host) {
  3073. ENetPeer* currentPeer;
  3074. if (host == NULL)
  3075. return;
  3076. enet_socket_destroy(host->socket);
  3077. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3078. enet_peer_reset(currentPeer);
  3079. }
  3080. enet_free(host->peers);
  3081. enet_free(host->compressionBuffer);
  3082. enet_free(host);
  3083. }
  3084. void enet_host_enable_compression(ENetHost* host) {
  3085. if (host == NULL)
  3086. return;
  3087. host->compression = 1;
  3088. }
  3089. void enet_host_prevent_connections(ENetHost* host, enet_uint8 state) {
  3090. if (host == NULL)
  3091. return;
  3092. host->preventConnections = state;
  3093. }
  3094. ENetPeer* enet_host_connect(ENetHost* host, const ENetAddress* address, size_t channelCount, enet_uint32 data) {
  3095. ENetPeer* currentPeer;
  3096. ENetChannel* channel;
  3097. ENetProtocol command;
  3098. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3099. channelCount = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3100. else if (channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3101. channelCount = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3102. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3103. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED)
  3104. break;
  3105. }
  3106. if (currentPeer >= &host->peers[host->peerCount])
  3107. return NULL;
  3108. currentPeer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  3109. if (currentPeer->channels == NULL)
  3110. return NULL;
  3111. currentPeer->channelCount = channelCount;
  3112. currentPeer->state = ENET_PEER_STATE_CONNECTING;
  3113. currentPeer->address = *address;
  3114. currentPeer->connectID = ++host->randomSeed;
  3115. if (host->outgoingBandwidth == 0)
  3116. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3117. else
  3118. currentPeer->windowSize = (host->outgoingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3119. if (currentPeer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  3120. currentPeer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3121. else if (currentPeer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  3122. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3123. for (channel = currentPeer->channels; channel < &currentPeer->channels[channelCount]; ++channel) {
  3124. channel->outgoingReliableSequenceNumber = 0;
  3125. channel->outgoingUnreliableSequenceNumber = 0;
  3126. channel->incomingReliableSequenceNumber = 0;
  3127. channel->incomingUnreliableSequenceNumber = 0;
  3128. enet_list_clear(&channel->incomingReliableCommands);
  3129. enet_list_clear(&channel->incomingUnreliableCommands);
  3130. channel->usedReliableWindows = 0;
  3131. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  3132. }
  3133. command.header.command = ENET_PROTOCOL_COMMAND_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3134. command.header.channelID = 0xFF;
  3135. command.connect.outgoingPeerID = ENET_HOST_TO_NET_16(currentPeer->incomingPeerID);
  3136. command.connect.incomingSessionID = currentPeer->incomingSessionID;
  3137. command.connect.outgoingSessionID = currentPeer->outgoingSessionID;
  3138. command.connect.mtu = ENET_HOST_TO_NET_32(currentPeer->mtu);
  3139. command.connect.windowSize = ENET_HOST_TO_NET_32(currentPeer->windowSize);
  3140. command.connect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  3141. command.connect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  3142. command.connect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3143. command.connect.packetThrottleInterval = ENET_HOST_TO_NET_32(currentPeer->packetThrottleInterval);
  3144. command.connect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleAcceleration);
  3145. command.connect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleDeceleration);
  3146. command.connect.connectID = currentPeer->connectID;
  3147. command.connect.data = ENET_HOST_TO_NET_32(data);
  3148. enet_peer_queue_outgoing_command(currentPeer, &command, NULL, 0, 0);
  3149. return currentPeer;
  3150. }
  3151. void enet_host_broadcast(ENetHost* host, enet_uint8 channelID, ENetPacket* packet) {
  3152. ENetPeer* currentPeer;
  3153. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3154. ++packet->referenceCount;
  3155. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3156. if (currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3157. continue;
  3158. enet_peer_send(currentPeer, channelID, packet);
  3159. }
  3160. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3161. --packet->referenceCount;
  3162. if (packet->referenceCount == 0)
  3163. enet_packet_destroy(packet);
  3164. }
  3165. void enet_host_broadcast_exclude(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer* excludedPeer) {
  3166. ENetPeer* currentPeer;
  3167. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3168. ++packet->referenceCount;
  3169. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3170. if (currentPeer->state != ENET_PEER_STATE_CONNECTED || currentPeer == excludedPeer)
  3171. continue;
  3172. enet_peer_send(currentPeer, channelID, packet);
  3173. }
  3174. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3175. --packet->referenceCount;
  3176. if (packet->referenceCount == 0)
  3177. enet_packet_destroy(packet);
  3178. }
  3179. void enet_host_broadcast_selective(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer** peers, size_t length) {
  3180. ENetPeer* currentPeer;
  3181. size_t i;
  3182. if (host == NULL)
  3183. return;
  3184. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3185. ++packet->referenceCount;
  3186. for (i = 0; i < length; i++) {
  3187. currentPeer = peers[i];
  3188. if (currentPeer == NULL || currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3189. continue;
  3190. enet_peer_send(currentPeer, channelID, packet);
  3191. }
  3192. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3193. --packet->referenceCount;
  3194. if (packet->referenceCount == 0)
  3195. enet_packet_destroy(packet);
  3196. }
  3197. void enet_host_channel_limit(ENetHost* host, size_t channelLimit) {
  3198. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3199. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3200. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3201. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3202. host->channelLimit = channelLimit;
  3203. }
  3204. void enet_host_bandwidth_limit(ENetHost* host, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth) {
  3205. host->incomingBandwidth = incomingBandwidth;
  3206. host->outgoingBandwidth = outgoingBandwidth;
  3207. host->recalculateBandwidthLimits = 1;
  3208. }
  3209. void enet_host_bandwidth_throttle(ENetHost* host) {
  3210. enet_uint32 timeCurrent = enet_time_get();
  3211. enet_uint32 elapsedTime = timeCurrent - host->bandwidthThrottleEpoch;
  3212. enet_uint32 peersRemaining = (enet_uint32)host->connectedPeers;
  3213. enet_uint32 dataTotal = ~0;
  3214. enet_uint32 bandwidth = ~0;
  3215. enet_uint32 throttle = 0;
  3216. enet_uint32 bandwidthLimit = 0;
  3217. int needsAdjustment = host->bandwidthLimitedPeers > 0 ? 1 : 0;
  3218. ENetPeer* peer;
  3219. ENetProtocol command;
  3220. if (elapsedTime < ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  3221. return;
  3222. if (host->outgoingBandwidth == 0 && host->incomingBandwidth == 0)
  3223. return;
  3224. host->bandwidthThrottleEpoch = timeCurrent;
  3225. if (peersRemaining == 0)
  3226. return;
  3227. if (host->outgoingBandwidth != 0) {
  3228. dataTotal = 0;
  3229. bandwidth = (host->outgoingBandwidth * elapsedTime) / 1000;
  3230. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3231. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3232. continue;
  3233. dataTotal += peer->outgoingDataTotal;
  3234. }
  3235. }
  3236. while (peersRemaining > 0 && needsAdjustment != 0) {
  3237. needsAdjustment = 0;
  3238. if (dataTotal <= bandwidth)
  3239. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3240. else
  3241. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3242. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3243. enet_uint32 peerBandwidth;
  3244. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidth == 0 || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3245. continue;
  3246. peerBandwidth = (peer->incomingBandwidth * elapsedTime) / 1000;
  3247. if ((throttle * peer->outgoingDataTotal) / ENET_PEER_PACKET_THROTTLE_SCALE <= peerBandwidth)
  3248. continue;
  3249. peer->packetThrottleLimit = (peerBandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / peer->outgoingDataTotal;
  3250. if (peer->packetThrottleLimit == 0)
  3251. peer->packetThrottleLimit = 1;
  3252. if (peer->packetThrottle > peer->packetThrottleLimit)
  3253. peer->packetThrottle = peer->packetThrottleLimit;
  3254. peer->outgoingBandwidthThrottleEpoch = timeCurrent;
  3255. peer->incomingDataTotal = 0;
  3256. peer->outgoingDataTotal = 0;
  3257. needsAdjustment = 1;
  3258. --peersRemaining;
  3259. bandwidth -= peerBandwidth;
  3260. dataTotal -= peerBandwidth;
  3261. }
  3262. }
  3263. if (peersRemaining > 0) {
  3264. if (dataTotal <= bandwidth)
  3265. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3266. else
  3267. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3268. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3269. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3270. continue;
  3271. peer->packetThrottleLimit = throttle;
  3272. if (peer->packetThrottle > peer->packetThrottleLimit)
  3273. peer->packetThrottle = peer->packetThrottleLimit;
  3274. peer->incomingDataTotal = 0;
  3275. peer->outgoingDataTotal = 0;
  3276. }
  3277. }
  3278. if (host->recalculateBandwidthLimits) {
  3279. host->recalculateBandwidthLimits = 0;
  3280. peersRemaining = (enet_uint32)host->connectedPeers;
  3281. bandwidth = host->incomingBandwidth;
  3282. needsAdjustment = 1;
  3283. if (bandwidth == 0) {
  3284. bandwidthLimit = 0;
  3285. } else {
  3286. while (peersRemaining > 0 && needsAdjustment != 0) {
  3287. needsAdjustment = 0;
  3288. bandwidthLimit = bandwidth / peersRemaining;
  3289. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3290. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3291. continue;
  3292. if (peer->outgoingBandwidth > 0 && peer->outgoingBandwidth >= bandwidthLimit)
  3293. continue;
  3294. peer->incomingBandwidthThrottleEpoch = timeCurrent;
  3295. needsAdjustment = 1;
  3296. --peersRemaining;
  3297. bandwidth -= peer->outgoingBandwidth;
  3298. }
  3299. }
  3300. }
  3301. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3302. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3303. continue;
  3304. command.header.command = ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3305. command.header.channelID = 0xFF;
  3306. command.bandwidthLimit.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3307. if (peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3308. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(peer->outgoingBandwidth);
  3309. else
  3310. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(bandwidthLimit);
  3311. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  3312. }
  3313. }
  3314. }
  3315. /*
  3316. =======================================================================
  3317. Address
  3318. =======================================================================
  3319. */
  3320. int enet_address_set_ip(ENetAddress* address, const char* ip) {
  3321. int type = AF_INET6;
  3322. void* destination = &address->ipv6;
  3323. if (strchr(ip, ':') == NULL) {
  3324. type = AF_INET;
  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_in6 sin;
  3413. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3414. if (getsockname(socket, (struct sockaddr*)&sin, &sinLength) == -1)
  3415. return -1;
  3416. address->ipv6 = sin.sin6_addr;
  3417. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3418. return 0;
  3419. }
  3420. int enet_socket_listen(ENetSocket socket, int backlog) {
  3421. return listen(socket, backlog < 0 ? SOMAXCONN : backlog);
  3422. }
  3423. ENetSocket enet_socket_create(ENetSocketType type) {
  3424. int socketType = (type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM);
  3425. #ifdef SOCK_CLOEXEC
  3426. socketType |= SOCK_CLOEXEC;
  3427. #endif
  3428. return socket(PF_INET6, socketType, 0);
  3429. }
  3430. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3431. int result = -1;
  3432. switch (option) {
  3433. case ENET_SOCKOPT_NONBLOCK:
  3434. result = fcntl(socket, F_SETFL, (value ? O_NONBLOCK : 0) | (fcntl(socket, F_GETFL) & ~O_NONBLOCK));
  3435. break;
  3436. case ENET_SOCKOPT_BROADCAST:
  3437. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3438. break;
  3439. case ENET_SOCKOPT_REUSEADDR:
  3440. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3441. break;
  3442. case ENET_SOCKOPT_RCVBUF:
  3443. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3444. break;
  3445. case ENET_SOCKOPT_SNDBUF:
  3446. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3447. break;
  3448. case ENET_SOCKOPT_RCVTIMEO: {
  3449. struct timeval timeVal;
  3450. timeVal.tv_sec = value / 1000;
  3451. timeVal.tv_usec = (value % 1000) * 1000;
  3452. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3453. break;
  3454. }
  3455. case ENET_SOCKOPT_SNDTIMEO: {
  3456. struct timeval timeVal;
  3457. timeVal.tv_sec = value / 1000;
  3458. timeVal.tv_usec = (value % 1000) * 1000;
  3459. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3460. break;
  3461. }
  3462. case ENET_SOCKOPT_NODELAY:
  3463. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3464. break;
  3465. case ENET_SOCKOPT_IPV6_V6ONLY:
  3466. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3467. break;
  3468. default:
  3469. break;
  3470. }
  3471. return result == -1 ? -1 : 0;
  3472. }
  3473. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3474. int result = -1;
  3475. socklen_t len;
  3476. switch (option) {
  3477. case ENET_SOCKOPT_ERROR:
  3478. len = sizeof(int);
  3479. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, value, &len);
  3480. break;
  3481. default:
  3482. break;
  3483. }
  3484. return result == -1 ? -1 : 0;
  3485. }
  3486. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3487. int result = -1;
  3488. struct sockaddr_in6 sin;
  3489. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3490. sin.sin6_family = AF_INET6;
  3491. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3492. sin.sin6_addr = address->ipv6;
  3493. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3494. if (result == -1 && errno == EINPROGRESS)
  3495. return 0;
  3496. return result;
  3497. }
  3498. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3499. int result = -1;
  3500. struct sockaddr_in6 sin;
  3501. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3502. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3503. if (result == -1)
  3504. return ENET_SOCKET_NULL;
  3505. if (address != NULL) {
  3506. address->ipv6 = sin.sin6_addr;
  3507. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3508. }
  3509. return result;
  3510. }
  3511. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3512. return shutdown(socket, (int)how);
  3513. }
  3514. void enet_socket_destroy(ENetSocket socket) {
  3515. if (socket != ENET_SOCKET_NULL)
  3516. close(socket);
  3517. }
  3518. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3519. struct msghdr msgHdr;
  3520. struct sockaddr_in6 sin;
  3521. int sentLength;
  3522. memset(&msgHdr, 0, sizeof(struct msghdr));
  3523. if (address != NULL) {
  3524. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3525. sin.sin6_family = AF_INET6;
  3526. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3527. sin.sin6_addr = address->ipv6;
  3528. msgHdr.msg_name = &sin;
  3529. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3530. }
  3531. msgHdr.msg_iov = (struct iovec*)buffers;
  3532. msgHdr.msg_iovlen = bufferCount;
  3533. sentLength = sendmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3534. if (sentLength == -1) {
  3535. if (errno == EWOULDBLOCK)
  3536. return 0;
  3537. return -1;
  3538. }
  3539. return sentLength;
  3540. }
  3541. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3542. struct msghdr msgHdr;
  3543. struct sockaddr_in6 sin;
  3544. int recvLength;
  3545. memset(&msgHdr, 0, sizeof(struct msghdr));
  3546. if (address != NULL) {
  3547. msgHdr.msg_name = &sin;
  3548. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3549. }
  3550. msgHdr.msg_iov = (struct iovec*)buffers;
  3551. msgHdr.msg_iovlen = bufferCount;
  3552. recvLength = recvmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3553. if (recvLength == -1) {
  3554. if (errno == EWOULDBLOCK)
  3555. return 0;
  3556. return -1;
  3557. }
  3558. if (msgHdr.msg_flags & MSG_TRUNC)
  3559. return -1;
  3560. if (address != NULL) {
  3561. address->ipv6 = sin.sin6_addr;
  3562. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3563. }
  3564. return recvLength;
  3565. }
  3566. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3567. struct timeval timeVal;
  3568. timeVal.tv_sec = timeout / 1000;
  3569. timeVal.tv_usec = (timeout % 1000) * 1000;
  3570. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3571. }
  3572. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3573. struct pollfd pollSocket;
  3574. int pollCount;
  3575. pollSocket.fd = socket;
  3576. pollSocket.events = 0;
  3577. if (*condition & ENET_SOCKET_WAIT_SEND)
  3578. pollSocket.events |= POLLOUT;
  3579. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3580. pollSocket.events |= POLLIN;
  3581. pollCount = poll(&pollSocket, 1, timeout);
  3582. if (pollCount < 0) {
  3583. if (errno == EINTR && *condition & ENET_SOCKET_WAIT_INTERRUPT) {
  3584. *condition = ENET_SOCKET_WAIT_INTERRUPT;
  3585. return 0;
  3586. }
  3587. return -1;
  3588. }
  3589. *condition = ENET_SOCKET_WAIT_NONE;
  3590. if (pollCount == 0)
  3591. return 0;
  3592. if (pollSocket.revents & POLLOUT)
  3593. *condition |= ENET_SOCKET_WAIT_SEND;
  3594. if (pollSocket.revents & POLLIN)
  3595. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3596. return 0;
  3597. }
  3598. #endif
  3599. /*
  3600. =======================================================================
  3601. Platform-specific (Windows)
  3602. =======================================================================
  3603. */
  3604. #ifdef _WIN32
  3605. int enet_initialize(void) {
  3606. WORD versionRequested = MAKEWORD(2, 2);
  3607. WSADATA wsaData;
  3608. if (WSAStartup(versionRequested, &wsaData))
  3609. return -1;
  3610. if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
  3611. WSACleanup();
  3612. return -1;
  3613. }
  3614. timeBeginPeriod(1);
  3615. return 0;
  3616. }
  3617. void enet_deinitialize(void) {
  3618. timeEndPeriod(1);
  3619. WSACleanup();
  3620. }
  3621. enet_uint64 enet_host_random_seed(void) {
  3622. return (enet_uint64)timeGetTime();
  3623. }
  3624. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3625. struct sockaddr_in6 sin;
  3626. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3627. sin.sin6_family = AF_INET6;
  3628. if (address != NULL) {
  3629. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3630. sin.sin6_addr = address->ipv6;
  3631. } else {
  3632. sin.sin6_port = 0;
  3633. sin.sin6_addr = in6addr_any;
  3634. }
  3635. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)) == SOCKET_ERROR ? -1 : 0;
  3636. }
  3637. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3638. struct sockaddr_in6 sin;
  3639. int sinLength = sizeof(struct sockaddr_in6);
  3640. if (getsockname(socket, (struct sockaddr*)&sin, &sinLength) == -1)
  3641. return -1;
  3642. address->ipv6 = sin.sin6_addr;
  3643. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3644. return 0;
  3645. }
  3646. int enet_socket_listen(ENetSocket socket, int backlog) {
  3647. return listen(socket, backlog < 0 ? SOMAXCONN : backlog) == SOCKET_ERROR ? -1 : 0;
  3648. }
  3649. ENetSocket enet_socket_create(ENetSocketType type) {
  3650. return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
  3651. }
  3652. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3653. int result = SOCKET_ERROR;
  3654. switch (option) {
  3655. case ENET_SOCKOPT_NONBLOCK: {
  3656. u_long nonBlocking = (u_long)value;
  3657. result = ioctlsocket(socket, FIONBIO, &nonBlocking);
  3658. break;
  3659. }
  3660. case ENET_SOCKOPT_BROADCAST:
  3661. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3662. break;
  3663. case ENET_SOCKOPT_REUSEADDR:
  3664. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3665. break;
  3666. case ENET_SOCKOPT_RCVBUF:
  3667. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3668. break;
  3669. case ENET_SOCKOPT_SNDBUF:
  3670. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3671. break;
  3672. case ENET_SOCKOPT_RCVTIMEO:
  3673. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&value, sizeof(int));
  3674. break;
  3675. case ENET_SOCKOPT_SNDTIMEO:
  3676. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&value, sizeof(int));
  3677. break;
  3678. case ENET_SOCKOPT_NODELAY:
  3679. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3680. break;
  3681. case ENET_SOCKOPT_IPV6_V6ONLY:
  3682. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3683. break;
  3684. default:
  3685. break;
  3686. }
  3687. return result == SOCKET_ERROR ? -1 : 0;
  3688. }
  3689. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3690. int result = SOCKET_ERROR, len;
  3691. switch (option) {
  3692. case ENET_SOCKOPT_ERROR:
  3693. len = sizeof(int);
  3694. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, (char*)value, &len);
  3695. break;
  3696. default:
  3697. break;
  3698. }
  3699. return result == SOCKET_ERROR ? -1 : 0;
  3700. }
  3701. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3702. int result = -1;
  3703. struct sockaddr_in6 sin;
  3704. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3705. sin.sin6_family = AF_INET6;
  3706. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3707. sin.sin6_addr = address->ipv6;
  3708. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3709. if (result == SOCKET_ERROR && WSAGetLastError() != WSAEWOULDBLOCK)
  3710. return -1;
  3711. return 0;
  3712. }
  3713. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3714. SOCKET result;
  3715. struct sockaddr_in6 sin;
  3716. int sinLength = sizeof(struct sockaddr_in6);
  3717. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3718. if (result == INVALID_SOCKET)
  3719. return ENET_SOCKET_NULL;
  3720. if (address != NULL) {
  3721. address->ipv6 = sin.sin6_addr;
  3722. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3723. }
  3724. return result;
  3725. }
  3726. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3727. return shutdown(socket, (int)how) == SOCKET_ERROR ? -1 : 0;
  3728. }
  3729. void enet_socket_destroy(ENetSocket socket) {
  3730. if (socket != INVALID_SOCKET)
  3731. closesocket(socket);
  3732. }
  3733. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3734. struct sockaddr_in6 sin;
  3735. DWORD sentLength;
  3736. if (address != NULL) {
  3737. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3738. sin.sin6_family = AF_INET6;
  3739. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3740. sin.sin6_addr = address->ipv6;
  3741. }
  3742. 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)
  3743. return (WSAGetLastError() == WSAEWOULDBLOCK) ? 0 : -1;
  3744. return (int)sentLength;
  3745. }
  3746. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3747. INT sinLength = sizeof(struct sockaddr_in6);
  3748. DWORD flags = 0, recvLength;
  3749. struct sockaddr_in6 sin;
  3750. if (WSARecvFrom(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &recvLength, &flags, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL, NULL, NULL) == SOCKET_ERROR) {
  3751. switch (WSAGetLastError()) {
  3752. case WSAEWOULDBLOCK:
  3753. case WSAECONNRESET:
  3754. return 0;
  3755. }
  3756. return -1;
  3757. }
  3758. if (flags & MSG_PARTIAL)
  3759. return -1;
  3760. if (address != NULL) {
  3761. address->ipv6 = sin.sin6_addr;
  3762. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3763. }
  3764. return (int)recvLength;
  3765. }
  3766. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3767. struct timeval timeVal;
  3768. timeVal.tv_sec = timeout / 1000;
  3769. timeVal.tv_usec = (timeout % 1000) * 1000;
  3770. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3771. }
  3772. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3773. fd_set readSet, writeSet;
  3774. struct timeval timeVal;
  3775. int selectCount;
  3776. timeVal.tv_sec = timeout / 1000;
  3777. timeVal.tv_usec = (timeout % 1000) * 1000;
  3778. FD_ZERO(&readSet);
  3779. FD_ZERO(&writeSet);
  3780. if (*condition & ENET_SOCKET_WAIT_SEND)
  3781. FD_SET(socket, &writeSet);
  3782. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3783. FD_SET(socket, &readSet);
  3784. selectCount = select(socket + 1, &readSet, &writeSet, NULL, &timeVal);
  3785. if (selectCount < 0)
  3786. return -1;
  3787. *condition = ENET_SOCKET_WAIT_NONE;
  3788. if (selectCount == 0)
  3789. return 0;
  3790. if (FD_ISSET(socket, &writeSet))
  3791. *condition |= ENET_SOCKET_WAIT_SEND;
  3792. if (FD_ISSET(socket, &readSet))
  3793. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3794. return 0;
  3795. }
  3796. #endif
  3797. /*
  3798. =======================================================================
  3799. Extended functionality
  3800. =======================================================================
  3801. */
  3802. void* enet_packet_get_data(const ENetPacket* packet) {
  3803. return (void*)packet->data;
  3804. }
  3805. int enet_packet_get_length(const ENetPacket* packet) {
  3806. return packet->dataLength;
  3807. }
  3808. void enet_packet_set_free_callback(ENetPacket* packet, const void* callback) {
  3809. packet->freeCallback = (ENetPacketFreeCallback)callback;
  3810. }
  3811. int enet_packet_check_references(const ENetPacket* packet) {
  3812. return (int)packet->referenceCount;
  3813. }
  3814. void enet_packet_dispose(ENetPacket* packet) {
  3815. if (packet->referenceCount == 0)
  3816. enet_packet_destroy(packet);
  3817. }
  3818. enet_uint32 enet_host_get_peers_count(const ENetHost* host) {
  3819. return host->connectedPeers;
  3820. }
  3821. enet_uint32 enet_host_get_packets_sent(const ENetHost* host) {
  3822. return host->totalSentPackets;
  3823. }
  3824. enet_uint32 enet_host_get_packets_received(const ENetHost* host) {
  3825. return host->totalReceivedPackets;
  3826. }
  3827. enet_uint32 enet_host_get_bytes_sent(const ENetHost* host) {
  3828. return host->totalSentData;
  3829. }
  3830. enet_uint32 enet_host_get_bytes_received(const ENetHost* host) {
  3831. return host->totalReceivedData;
  3832. }
  3833. enet_uint32 enet_peer_get_id(const ENetPeer* peer) {
  3834. return peer->incomingPeerID;
  3835. }
  3836. int enet_peer_get_ip(const ENetPeer* peer, char* ip, size_t ipLength) {
  3837. return enet_address_get_ip(&peer->address, ip, ipLength);
  3838. }
  3839. enet_uint16 enet_peer_get_port(const ENetPeer* peer) {
  3840. return peer->address.port;
  3841. }
  3842. enet_uint32 enet_peer_get_mtu(const ENetPeer* peer) {
  3843. return peer->mtu;
  3844. }
  3845. ENetPeerState enet_peer_get_state(const ENetPeer* peer) {
  3846. return peer->state;
  3847. }
  3848. enet_uint32 enet_peer_get_rtt(const ENetPeer* peer) {
  3849. return peer->smoothedRoundTripTime;
  3850. }
  3851. enet_uint32 enet_peer_get_lastsendtime(const ENetPeer* peer) {
  3852. return peer->lastSendTime;
  3853. }
  3854. enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer* peer) {
  3855. return peer->lastReceiveTime;
  3856. }
  3857. enet_uint64 enet_peer_get_packets_sent(const ENetPeer* peer) {
  3858. return peer->totalPacketsSent;
  3859. }
  3860. enet_uint64 enet_peer_get_packets_lost(const ENetPeer* peer) {
  3861. return peer->totalPacketsLost;
  3862. }
  3863. enet_uint64 enet_peer_get_bytes_sent(const ENetPeer* peer) {
  3864. return peer->totalDataSent;
  3865. }
  3866. enet_uint64 enet_peer_get_bytes_received(const ENetPeer* peer) {
  3867. return peer->totalDataReceived;
  3868. }
  3869. void* enet_peer_get_data(const ENetPeer* peer) {
  3870. return (void*)peer->data;
  3871. }
  3872. void enet_peer_set_data(ENetPeer* peer, const void* data) {
  3873. peer->data = (enet_uint32*)data;
  3874. }
  3875. #endif // ENET_IMPLEMENTATION
  3876. #endif // ENET_H