enet.h 176 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. #ifdef ENET_LZ4
  30. #include "lz4/lz4.h"
  31. #endif
  32. #define ENET_VERSION_MAJOR 2
  33. #define ENET_VERSION_MINOR 1
  34. #define ENET_VERSION_PATCH 7
  35. #define ENET_VERSION_CREATE(major, minor, patch) (((major) << 16) | ((minor) << 8) | (patch))
  36. #define ENET_VERSION_GET_MAJOR(version) (((version) >> 16) & 0xFF)
  37. #define ENET_VERSION_GET_MINOR(version) (((version) >> 8) & 0xFF)
  38. #define ENET_VERSION_GET_PATCH(version) ((version) & 0xFF)
  39. #define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH)
  40. #define ENET_TIME_OVERFLOW 86400000
  41. #define ENET_TIME_LESS(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW)
  42. #define ENET_TIME_GREATER(a, b) ((b) - (a) >= ENET_TIME_OVERFLOW)
  43. #define ENET_TIME_LESS_EQUAL(a, b) (!ENET_TIME_GREATER(a, b))
  44. #define ENET_TIME_GREATER_EQUAL(a, b) (!ENET_TIME_LESS(a, b))
  45. #define ENET_TIME_DIFFERENCE(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW ? (b) - (a) : (a) - (b))
  46. #define ENET_SRTT_INITIAL 1.0
  47. #define ENET_SRTT_PARA_G 0.125
  48. // =======================================================================//
  49. // !
  50. // ! System differences
  51. // !
  52. // =======================================================================//
  53. #ifdef _WIN32
  54. #ifdef __MINGW32__
  55. #include "mingw/inet_ntop.c"
  56. #include "mingw/inet_pton.c"
  57. #endif
  58. #if defined(_MSC_VER) && defined(ENET_IMPLEMENTATION)
  59. #pragma warning(disable: 4267) /* size_t to int conversion */
  60. #pragma warning(disable: 4244) /* 64bit to 32bit int */
  61. #pragma warning(disable: 4018) /* signed/unsigned mismatch */
  62. #pragma warning(disable: 4146) /* unary minus operator applied to unsigned type */
  63. #endif
  64. #ifndef ENET_NO_PRAGMA_LINK
  65. #pragma comment(lib, "ws2_32.lib")
  66. #pragma comment(lib, "winmm.lib")
  67. #endif
  68. #if _MSC_VER >= 1910
  69. /* It looks like there were changes as of Visual Studio 2017 and there are no 32/64 bit
  70. versions of _InterlockedExchange[operation], only InterlockedExchange[operation]
  71. (without leading underscore), so we have to distinguish between compiler versions */
  72. #define NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  73. #endif
  74. #ifdef __GNUC__
  75. #if (_WIN32_WINNT < 0x0501)
  76. #undef _WIN32_WINNT
  77. #define _WIN32_WINNT 0x0501
  78. #endif
  79. #endif
  80. #include <winsock2.h>
  81. #include <ws2tcpip.h>
  82. #include <mmsystem.h>
  83. #include <intrin.h>
  84. #if defined(_WIN32) && defined(_MSC_VER)
  85. #if _MSC_VER < 1900
  86. typedef struct timespec {
  87. long tv_sec;
  88. long tv_nsec;
  89. };
  90. #endif
  91. #define CLOCK_MONOTONIC 0
  92. #endif
  93. typedef SOCKET ENetSocket;
  94. #define ENET_SOCKET_NULL INVALID_SOCKET
  95. typedef struct {
  96. size_t dataLength;
  97. void* data;
  98. } ENetBuffer;
  99. #define ENET_CALLBACK __cdecl
  100. #ifdef ENET_DLL
  101. #ifdef ENET_IMPLEMENTATION
  102. #define ENET_API __declspec(dllexport)
  103. #else
  104. #define ENET_API __declspec(dllimport)
  105. #endif
  106. #else
  107. #define ENET_API extern
  108. #endif
  109. #else
  110. #include <sys/types.h>
  111. #include <sys/ioctl.h>
  112. #include <sys/time.h>
  113. #include <sys/socket.h>
  114. #include <poll.h>
  115. #include <arpa/inet.h>
  116. #include <netinet/in.h>
  117. #include <netinet/tcp.h>
  118. #include <netdb.h>
  119. #include <unistd.h>
  120. #include <string.h>
  121. #include <errno.h>
  122. #include <fcntl.h>
  123. #ifdef __APPLE__
  124. #include <mach/clock.h>
  125. #include <mach/mach.h>
  126. #include <Availability.h>
  127. #endif
  128. #ifndef MSG_NOSIGNAL
  129. #define MSG_NOSIGNAL 0
  130. #endif
  131. #ifdef MSG_MAXIOVLEN
  132. #define ENET_BUFFER_MAXIMUM MSG_MAXIOVLEN
  133. #endif
  134. typedef int ENetSocket;
  135. #define ENET_SOCKET_NULL -1
  136. typedef struct {
  137. void* data;
  138. size_t dataLength;
  139. } ENetBuffer;
  140. #define ENET_CALLBACK
  141. #define ENET_API extern
  142. #endif
  143. #ifndef ENET_BUFFER_MAXIMUM
  144. #define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS)
  145. #endif
  146. #define ENET_MAX(x, y) ((x) > (y) ? (x) : (y))
  147. #define ENET_MIN(x, y) ((x) < (y) ? (x) : (y))
  148. #define ENET_IPV6 1
  149. #define ENET_HOST_ANY in6addr_any
  150. #define ENET_HOST_BROADCAST 0xFFFFFFFFU
  151. #define ENET_PORT_ANY 0
  152. #define ENET_HOST_TO_NET_16(value) (htons(value))
  153. #define ENET_HOST_TO_NET_32(value) (htonl(value))
  154. #define ENET_NET_TO_HOST_16(value) (ntohs(value))
  155. #define ENET_NET_TO_HOST_32(value) (ntohl(value))
  156. #define ENET_SOCKETSET_EMPTY(sockset) FD_ZERO(&(sockset))
  157. #define ENET_SOCKETSET_ADD(sockset, socket) FD_SET(socket, &(sockset))
  158. #define ENET_SOCKETSET_REMOVE(sockset, socket) FD_CLR(socket, &(sockset))
  159. #define ENET_SOCKETSET_CHECK(sockset, socket) FD_ISSET(socket, &(sockset))
  160. #ifdef __cplusplus
  161. extern "C" {
  162. #endif
  163. // =======================================================================//
  164. // !
  165. // ! Basic stuff
  166. // !
  167. // =======================================================================//
  168. typedef uint8_t enet_uint8;
  169. typedef uint16_t enet_uint16;
  170. typedef uint32_t enet_uint32;
  171. typedef uint64_t enet_uint64;
  172. typedef enet_uint32 ENetVersion;
  173. typedef fd_set ENetSocketSet;
  174. typedef struct _ENetCallbacks {
  175. void*(ENET_CALLBACK* malloc)(size_t size);
  176. void(ENET_CALLBACK* free)(void* memory);
  177. void(ENET_CALLBACK* noMemory)(void);
  178. } ENetCallbacks;
  179. extern void* enet_malloc(size_t);
  180. extern void enet_free(void*);
  181. // =======================================================================//
  182. // !
  183. // ! List
  184. // !
  185. // =======================================================================//
  186. typedef struct _ENetListNode {
  187. struct _ENetListNode* next;
  188. struct _ENetListNode* previous;
  189. } ENetListNode;
  190. typedef ENetListNode* ENetListIterator;
  191. typedef struct _ENetList {
  192. ENetListNode sentinel;
  193. } ENetList;
  194. extern ENetListIterator enet_list_insert(ENetListIterator, void*);
  195. extern ENetListIterator enet_list_move(ENetListIterator, void*, void*);
  196. extern void* enet_list_remove(ENetListIterator);
  197. extern void enet_list_clear(ENetList*);
  198. extern size_t enet_list_size(ENetList*);
  199. #define enet_list_begin(list) ((list)->sentinel.next)
  200. #define enet_list_end(list) (&(list)->sentinel)
  201. #define enet_list_empty(list) (enet_list_begin(list) == enet_list_end(list))
  202. #define enet_list_next(iterator) ((iterator)->next)
  203. #define enet_list_previous(iterator) ((iterator)->previous)
  204. #define enet_list_front(list) ((void*)(list)->sentinel.next)
  205. #define enet_list_back(list) ((void*)(list)->sentinel.previous)
  206. // =======================================================================//
  207. // !
  208. // ! Protocol
  209. // !
  210. // =======================================================================//
  211. enum {
  212. ENET_PROTOCOL_MINIMUM_MTU = 576,
  213. ENET_PROTOCOL_MAXIMUM_MTU = 4096,
  214. ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS = 32,
  215. ENET_PROTOCOL_MINIMUM_WINDOW_SIZE = 4096,
  216. ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE = 65536,
  217. ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT = 1,
  218. ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT = 255,
  219. ENET_PROTOCOL_MAXIMUM_PEER_ID = 0xFFF,
  220. ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT = 1024 * 1024
  221. };
  222. typedef enum _ENetProtocolCommand {
  223. ENET_PROTOCOL_COMMAND_NONE = 0,
  224. ENET_PROTOCOL_COMMAND_ACKNOWLEDGE = 1,
  225. ENET_PROTOCOL_COMMAND_CONNECT = 2,
  226. ENET_PROTOCOL_COMMAND_VERIFY_CONNECT = 3,
  227. ENET_PROTOCOL_COMMAND_DISCONNECT = 4,
  228. ENET_PROTOCOL_COMMAND_PING = 5,
  229. ENET_PROTOCOL_COMMAND_SEND_RELIABLE = 6,
  230. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE = 7,
  231. ENET_PROTOCOL_COMMAND_SEND_FRAGMENT = 8,
  232. ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED = 9,
  233. ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT = 10,
  234. ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE = 11,
  235. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT = 12,
  236. ENET_PROTOCOL_COMMAND_COUNT = 13,
  237. ENET_PROTOCOL_COMMAND_MASK = 0x0F
  238. } ENetProtocolCommand;
  239. typedef enum _ENetProtocolFlag {
  240. ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE = (1 << 7),
  241. ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED = (1 << 6),
  242. ENET_PROTOCOL_HEADER_FLAG_SENT_TIME = (1 << 14),
  243. ENET_PROTOCOL_HEADER_FLAG_COMPRESSED = (1 << 15),
  244. ENET_PROTOCOL_HEADER_FLAG_MASK = ENET_PROTOCOL_HEADER_FLAG_SENT_TIME | ENET_PROTOCOL_HEADER_FLAG_COMPRESSED,
  245. ENET_PROTOCOL_HEADER_SESSION_MASK = (3 << 12),
  246. ENET_PROTOCOL_HEADER_SESSION_SHIFT = 12
  247. } ENetProtocolFlag;
  248. #ifdef _MSC_VER
  249. #pragma pack(push, 1)
  250. #define ENET_PACKED
  251. #elif defined(__GNUC__) || defined(__clang__)
  252. #define ENET_PACKED __attribute__ ((packed))
  253. #else
  254. #define ENET_PACKED
  255. #endif
  256. typedef struct _ENetProtocolHeader {
  257. enet_uint16 peerID;
  258. enet_uint16 sentTime;
  259. } ENET_PACKED ENetProtocolHeader;
  260. typedef struct _ENetProtocolCommandHeader {
  261. enet_uint8 command;
  262. enet_uint8 channelID;
  263. enet_uint16 reliableSequenceNumber;
  264. } ENET_PACKED ENetProtocolCommandHeader;
  265. typedef struct _ENetProtocolAcknowledge {
  266. ENetProtocolCommandHeader header;
  267. enet_uint16 receivedReliableSequenceNumber;
  268. enet_uint16 receivedSentTime;
  269. } ENET_PACKED ENetProtocolAcknowledge;
  270. typedef struct _ENetProtocolConnect {
  271. ENetProtocolCommandHeader header;
  272. enet_uint16 outgoingPeerID;
  273. enet_uint8 incomingSessionID;
  274. enet_uint8 outgoingSessionID;
  275. enet_uint32 mtu;
  276. enet_uint32 windowSize;
  277. enet_uint32 channelCount;
  278. enet_uint32 incomingBandwidth;
  279. enet_uint32 outgoingBandwidth;
  280. enet_uint32 packetThrottleInterval;
  281. enet_uint32 packetThrottleAcceleration;
  282. enet_uint32 packetThrottleDeceleration;
  283. enet_uint32 connectID;
  284. enet_uint32 data;
  285. } ENET_PACKED ENetProtocolConnect;
  286. typedef struct _ENetProtocolVerifyConnect {
  287. ENetProtocolCommandHeader header;
  288. enet_uint16 outgoingPeerID;
  289. enet_uint8 incomingSessionID;
  290. enet_uint8 outgoingSessionID;
  291. enet_uint32 mtu;
  292. enet_uint32 windowSize;
  293. enet_uint32 channelCount;
  294. enet_uint32 incomingBandwidth;
  295. enet_uint32 outgoingBandwidth;
  296. enet_uint32 packetThrottleInterval;
  297. enet_uint32 packetThrottleAcceleration;
  298. enet_uint32 packetThrottleDeceleration;
  299. enet_uint32 connectID;
  300. } ENET_PACKED ENetProtocolVerifyConnect;
  301. typedef struct _ENetProtocolBandwidthLimit {
  302. ENetProtocolCommandHeader header;
  303. enet_uint32 incomingBandwidth;
  304. enet_uint32 outgoingBandwidth;
  305. } ENET_PACKED ENetProtocolBandwidthLimit;
  306. typedef struct _ENetProtocolThrottleConfigure {
  307. ENetProtocolCommandHeader header;
  308. enet_uint32 packetThrottleInterval;
  309. enet_uint32 packetThrottleAcceleration;
  310. enet_uint32 packetThrottleDeceleration;
  311. } ENET_PACKED ENetProtocolThrottleConfigure;
  312. typedef struct _ENetProtocolDisconnect {
  313. ENetProtocolCommandHeader header;
  314. enet_uint32 data;
  315. } ENET_PACKED ENetProtocolDisconnect;
  316. typedef struct _ENetProtocolPing {
  317. ENetProtocolCommandHeader header;
  318. } ENET_PACKED ENetProtocolPing;
  319. typedef struct _ENetProtocolSendReliable {
  320. ENetProtocolCommandHeader header;
  321. enet_uint16 dataLength;
  322. } ENET_PACKED ENetProtocolSendReliable;
  323. typedef struct _ENetProtocolSendUnreliable {
  324. ENetProtocolCommandHeader header;
  325. enet_uint16 unreliableSequenceNumber;
  326. enet_uint16 dataLength;
  327. } ENET_PACKED ENetProtocolSendUnreliable;
  328. typedef struct _ENetProtocolSendUnsequenced {
  329. ENetProtocolCommandHeader header;
  330. enet_uint16 unsequencedGroup;
  331. enet_uint16 dataLength;
  332. } ENET_PACKED ENetProtocolSendUnsequenced;
  333. typedef struct _ENetProtocolSendFragment {
  334. ENetProtocolCommandHeader header;
  335. enet_uint16 startSequenceNumber;
  336. enet_uint16 dataLength;
  337. enet_uint32 fragmentCount;
  338. enet_uint32 fragmentNumber;
  339. enet_uint32 totalLength;
  340. enet_uint32 fragmentOffset;
  341. } ENET_PACKED ENetProtocolSendFragment;
  342. typedef union _ENetProtocol {
  343. ENetProtocolCommandHeader header;
  344. ENetProtocolAcknowledge acknowledge;
  345. ENetProtocolConnect connect;
  346. ENetProtocolVerifyConnect verifyConnect;
  347. ENetProtocolDisconnect disconnect;
  348. ENetProtocolPing ping;
  349. ENetProtocolSendReliable sendReliable;
  350. ENetProtocolSendUnreliable sendUnreliable;
  351. ENetProtocolSendUnsequenced sendUnsequenced;
  352. ENetProtocolSendFragment sendFragment;
  353. ENetProtocolBandwidthLimit bandwidthLimit;
  354. ENetProtocolThrottleConfigure throttleConfigure;
  355. } ENET_PACKED ENetProtocol;
  356. #ifdef _MSC_VER
  357. #pragma pack(pop)
  358. #endif
  359. // =======================================================================//
  360. // !
  361. // ! General ENet structs/enums
  362. // !
  363. // =======================================================================//
  364. typedef enum _ENetSocketType {
  365. ENET_SOCKET_TYPE_STREAM = 1,
  366. ENET_SOCKET_TYPE_DATAGRAM = 2
  367. } ENetSocketType;
  368. typedef enum _ENetSocketWait {
  369. ENET_SOCKET_WAIT_NONE = 0,
  370. ENET_SOCKET_WAIT_SEND = (1 << 0),
  371. ENET_SOCKET_WAIT_RECEIVE = (1 << 1),
  372. ENET_SOCKET_WAIT_INTERRUPT = (1 << 2)
  373. } ENetSocketWait;
  374. typedef enum _ENetSocketOption {
  375. ENET_SOCKOPT_NONBLOCK = 1,
  376. ENET_SOCKOPT_BROADCAST = 2,
  377. ENET_SOCKOPT_RCVBUF = 3,
  378. ENET_SOCKOPT_SNDBUF = 4,
  379. ENET_SOCKOPT_REUSEADDR = 5,
  380. ENET_SOCKOPT_RCVTIMEO = 6,
  381. ENET_SOCKOPT_SNDTIMEO = 7,
  382. ENET_SOCKOPT_ERROR = 8,
  383. ENET_SOCKOPT_NODELAY = 9,
  384. ENET_SOCKOPT_IPV6_V6ONLY = 10
  385. } ENetSocketOption;
  386. typedef enum _ENetSocketShutdown {
  387. ENET_SOCKET_SHUTDOWN_READ = 0,
  388. ENET_SOCKET_SHUTDOWN_WRITE = 1,
  389. ENET_SOCKET_SHUTDOWN_READ_WRITE = 2
  390. } ENetSocketShutdown;
  391. typedef struct _ENetAddress {
  392. struct in6_addr host;
  393. enet_uint16 port;
  394. enet_uint16 scope;
  395. } ENetAddress;
  396. #define in6_equal(in6_addr_a, in6_addr_b) (memcmp(&in6_addr_a, &in6_addr_b, sizeof(struct in6_addr)) == 0)
  397. typedef enum _ENetPacketFlag {
  398. ENET_PACKET_FLAG_RELIABLE = (1 << 0),
  399. ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1),
  400. ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2),
  401. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT = (1 << 3),
  402. ENET_PACKET_FLAG_SENT = (1 << 8)
  403. } ENetPacketFlag;
  404. typedef void (ENET_CALLBACK* ENetPacketFreeCallback)(void*);
  405. typedef struct _ENetPacket {
  406. enet_uint32 flags;
  407. enet_uint32 dataLength;
  408. enet_uint8* data;
  409. ENetPacketFreeCallback freeCallback;
  410. enet_uint32 referenceCount;
  411. } ENetPacket;
  412. typedef struct _ENetAcknowledgement {
  413. ENetListNode acknowledgementList;
  414. enet_uint32 sentTime;
  415. ENetProtocol command;
  416. } ENetAcknowledgement;
  417. typedef struct _ENetOutgoingCommand {
  418. ENetListNode outgoingCommandList;
  419. enet_uint16 reliableSequenceNumber;
  420. enet_uint16 unreliableSequenceNumber;
  421. enet_uint32 sentTime;
  422. enet_uint32 roundTripTimeout;
  423. enet_uint32 roundTripTimeoutLimit;
  424. enet_uint32 fragmentOffset;
  425. enet_uint16 fragmentLength;
  426. enet_uint16 sendAttempts;
  427. ENetProtocol command;
  428. ENetPacket* packet;
  429. } ENetOutgoingCommand;
  430. typedef struct _ENetIncomingCommand {
  431. ENetListNode incomingCommandList;
  432. enet_uint16 reliableSequenceNumber;
  433. enet_uint16 unreliableSequenceNumber;
  434. ENetProtocol command;
  435. enet_uint32 fragmentCount;
  436. enet_uint32 fragmentsRemaining;
  437. enet_uint32* fragments;
  438. ENetPacket* packet;
  439. } ENetIncomingCommand;
  440. typedef enum _ENetPeerState {
  441. ENET_PEER_STATE_DISCONNECTED = 0,
  442. ENET_PEER_STATE_CONNECTING = 1,
  443. ENET_PEER_STATE_ACKNOWLEDGING_CONNECT = 2,
  444. ENET_PEER_STATE_CONNECTION_PENDING = 3,
  445. ENET_PEER_STATE_CONNECTION_SUCCEEDED = 4,
  446. ENET_PEER_STATE_CONNECTED = 5,
  447. ENET_PEER_STATE_DISCONNECT_LATER = 6,
  448. ENET_PEER_STATE_DISCONNECTING = 7,
  449. ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT = 8,
  450. ENET_PEER_STATE_ZOMBIE = 9
  451. } ENetPeerState;
  452. enum {
  453. ENET_HOST_RECEIVE_BUFFER_SIZE = 256 * 1024,
  454. ENET_HOST_SEND_BUFFER_SIZE = 256 * 1024,
  455. ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000,
  456. ENET_HOST_DEFAULT_MTU = 1400,
  457. ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024,
  458. ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
  459. ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 500,
  460. ENET_PEER_DEFAULT_PACKET_THROTTLE = 32,
  461. ENET_PEER_PACKET_THROTTLE_SCALE = 32,
  462. ENET_PEER_PACKET_THROTTLE_COUNTER = 7,
  463. ENET_PEER_PACKET_THROTTLE_ACCELERATION = 2,
  464. ENET_PEER_PACKET_THROTTLE_DECELERATION = 2,
  465. ENET_PEER_PACKET_THROTTLE_INTERVAL = 5000,
  466. ENET_PEER_PACKET_LOSS_SCALE = (1 << 16),
  467. ENET_PEER_PACKET_LOSS_INTERVAL = 10000,
  468. ENET_PEER_WINDOW_SIZE_SCALE = 64 * 1024,
  469. ENET_PEER_TIMEOUT_LIMIT = 32,
  470. ENET_PEER_TIMEOUT_MINIMUM = 5000,
  471. ENET_PEER_TIMEOUT_MAXIMUM = 30000,
  472. ENET_PEER_PING_INTERVAL = 500,
  473. ENET_PEER_UNSEQUENCED_WINDOWS = 64,
  474. ENET_PEER_UNSEQUENCED_WINDOW_SIZE = 1024,
  475. ENET_PEER_FREE_UNSEQUENCED_WINDOWS = 32,
  476. ENET_PEER_RELIABLE_WINDOWS = 16,
  477. ENET_PEER_RELIABLE_WINDOW_SIZE = 0x1000,
  478. ENET_PEER_FREE_RELIABLE_WINDOWS = 8
  479. };
  480. typedef struct _ENetChannel {
  481. enet_uint16 outgoingReliableSequenceNumber;
  482. enet_uint16 outgoingUnreliableSequenceNumber;
  483. enet_uint16 usedReliableWindows;
  484. enet_uint16 reliableWindows[ENET_PEER_RELIABLE_WINDOWS];
  485. enet_uint16 incomingReliableSequenceNumber;
  486. enet_uint16 incomingUnreliableSequenceNumber;
  487. ENetList incomingReliableCommands;
  488. ENetList incomingUnreliableCommands;
  489. } ENetChannel;
  490. typedef struct _ENetPeer {
  491. ENetListNode dispatchList;
  492. struct _ENetHost* host;
  493. enet_uint16 outgoingPeerID;
  494. enet_uint16 incomingPeerID;
  495. enet_uint32 connectID;
  496. enet_uint8 outgoingSessionID;
  497. enet_uint8 incomingSessionID;
  498. ENetAddress address;
  499. void* data;
  500. ENetPeerState state;
  501. ENetChannel* channels;
  502. size_t channelCount;
  503. enet_uint32 incomingBandwidth;
  504. enet_uint32 outgoingBandwidth;
  505. enet_uint32 incomingBandwidthThrottleEpoch;
  506. enet_uint32 outgoingBandwidthThrottleEpoch;
  507. enet_uint32 incomingDataTotal;
  508. enet_uint64 totalDataReceived;
  509. enet_uint32 outgoingDataTotal;
  510. enet_uint64 totalDataSent;
  511. enet_uint32 lastSendTime;
  512. enet_uint32 lastReceiveTime;
  513. enet_uint32 nextTimeout;
  514. enet_uint32 earliestTimeout;
  515. enet_uint32 packetLossEpoch;
  516. enet_uint32 packetsSent;
  517. enet_uint64 totalPacketsSent;
  518. enet_uint32 packetsLost;
  519. enet_uint32 totalPacketsLost;
  520. enet_uint32 packetLoss;
  521. enet_uint32 packetLossVariance;
  522. enet_uint32 packetThrottle;
  523. enet_uint32 packetThrottleLimit;
  524. enet_uint32 packetThrottleCounter;
  525. enet_uint32 packetThrottleEpoch;
  526. enet_uint32 packetThrottleAcceleration;
  527. enet_uint32 packetThrottleDeceleration;
  528. enet_uint32 packetThrottleInterval;
  529. enet_uint32 pingInterval;
  530. enet_uint32 timeoutLimit;
  531. enet_uint32 timeoutMinimum;
  532. enet_uint32 timeoutMaximum;
  533. enet_uint32 smoothedRoundTripTime;
  534. enet_uint32 lastRoundTripTime;
  535. enet_uint32 lowestRoundTripTime;
  536. enet_uint32 lastRoundTripTimeVariance;
  537. enet_uint32 highestRoundTripTimeVariance;
  538. enet_uint32 roundTripTime;
  539. enet_uint32 roundTripTimeVariance;
  540. enet_uint32 mtu;
  541. enet_uint32 windowSize;
  542. enet_uint32 reliableDataInTransit;
  543. enet_uint16 outgoingReliableSequenceNumber;
  544. ENetList acknowledgements;
  545. ENetList sentReliableCommands;
  546. ENetList sentUnreliableCommands;
  547. ENetList outgoingReliableCommands;
  548. ENetList outgoingUnreliableCommands;
  549. ENetList dispatchedCommands;
  550. int needsDispatch;
  551. enet_uint16 incomingUnsequencedGroup;
  552. enet_uint16 outgoingUnsequencedGroup;
  553. enet_uint32 unsequencedWindow[ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32];
  554. enet_uint32 eventData;
  555. size_t totalWaitingData;
  556. } ENetPeer;
  557. typedef enet_uint32 (ENET_CALLBACK* ENetChecksumCallback)(const ENetBuffer* buffers, size_t bufferCount);
  558. typedef int (ENET_CALLBACK* ENetInterceptCallback)(struct _ENetHost* host, void* event);
  559. typedef struct _ENetHost {
  560. ENetSocket socket;
  561. ENetAddress address;
  562. enet_uint32 incomingBandwidth;
  563. enet_uint32 outgoingBandwidth;
  564. enet_uint32 bandwidthThrottleEpoch;
  565. enet_uint32 mtu;
  566. enet_uint32 randomSeed;
  567. int recalculateBandwidthLimits;
  568. enet_uint8 preventConnections;
  569. ENetPeer* peers;
  570. size_t peerCount;
  571. size_t channelLimit;
  572. enet_uint32 serviceTime;
  573. ENetList dispatchQueue;
  574. int continueSending;
  575. size_t packetSize;
  576. enet_uint16 headerFlags;
  577. enet_uint32 totalSentData;
  578. enet_uint32 totalSentPackets;
  579. enet_uint32 totalReceivedData;
  580. enet_uint32 totalReceivedPackets;
  581. ENetProtocol commands[ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
  582. size_t commandCount;
  583. ENetBuffer buffers[ENET_BUFFER_MAXIMUM];
  584. size_t bufferCount;
  585. enet_uint8 compression;
  586. ENetChecksumCallback checksumCallback;
  587. enet_uint8 packetData[2][ENET_PROTOCOL_MAXIMUM_MTU];
  588. ENetAddress receivedAddress;
  589. enet_uint8* receivedData;
  590. size_t receivedDataLength;
  591. ENetInterceptCallback interceptCallback;
  592. size_t connectedPeers;
  593. size_t bandwidthLimitedPeers;
  594. size_t duplicatePeers;
  595. size_t maximumPacketSize;
  596. size_t maximumWaitingData;
  597. } ENetHost;
  598. typedef enum _ENetEventType {
  599. ENET_EVENT_TYPE_NONE = 0,
  600. ENET_EVENT_TYPE_CONNECT = 1,
  601. ENET_EVENT_TYPE_DISCONNECT = 2,
  602. ENET_EVENT_TYPE_RECEIVE = 3,
  603. ENET_EVENT_TYPE_DISCONNECT_TIMEOUT = 4
  604. } ENetEventType;
  605. typedef struct _ENetEvent {
  606. ENetEventType type;
  607. ENetPeer* peer;
  608. enet_uint8 channelID;
  609. enet_uint32 data;
  610. ENetPacket* packet;
  611. } ENetEvent;
  612. // =======================================================================//
  613. // !
  614. // ! Public API
  615. // !
  616. // =======================================================================//
  617. ENET_API int enet_initialize(void);
  618. ENET_API int enet_initialize_with_callbacks(ENetVersion, const ENetCallbacks*);
  619. ENET_API void enet_deinitialize(void);
  620. ENET_API ENetVersion enet_linked_version(void);
  621. ENET_API enet_uint32 enet_time_get(void);
  622. ENET_API ENetSocket enet_socket_create(ENetSocketType);
  623. ENET_API int enet_socket_bind(ENetSocket, const ENetAddress*);
  624. ENET_API int enet_socket_get_address(ENetSocket, ENetAddress*);
  625. ENET_API int enet_socket_listen(ENetSocket, int);
  626. ENET_API ENetSocket enet_socket_accept(ENetSocket, ENetAddress*);
  627. ENET_API int enet_socket_connect(ENetSocket, const ENetAddress*);
  628. ENET_API int enet_socket_send(ENetSocket, const ENetAddress*, const ENetBuffer*, size_t);
  629. ENET_API int enet_socket_receive(ENetSocket, ENetAddress*, ENetBuffer*, size_t);
  630. ENET_API int enet_socket_wait(ENetSocket, enet_uint32*, enet_uint64);
  631. ENET_API int enet_socket_set_option(ENetSocket, ENetSocketOption, int);
  632. ENET_API int enet_socket_get_option(ENetSocket, ENetSocketOption, int*);
  633. ENET_API int enet_socket_shutdown(ENetSocket, ENetSocketShutdown);
  634. ENET_API void enet_socket_destroy(ENetSocket);
  635. ENET_API int enet_socket_set_select(ENetSocket, ENetSocketSet*, ENetSocketSet*, enet_uint32);
  636. ENET_API int enet_address_set_host_ip(ENetAddress*, const char*);
  637. ENET_API int enet_address_set_host(ENetAddress*, const char*);
  638. ENET_API int enet_address_get_host_ip(const ENetAddress*, char*, size_t);
  639. ENET_API int enet_address_get_host(const ENetAddress*, char*, size_t);
  640. ENET_API ENetPacket* enet_packet_create(const void*, size_t, enet_uint32);
  641. ENET_API ENetPacket* enet_packet_create_offset(const void*, size_t, size_t, enet_uint32);
  642. ENET_API void enet_packet_destroy(ENetPacket*);
  643. ENET_API enet_uint32 enet_crc32(const ENetBuffer*, size_t);
  644. ENET_API ENetHost* enet_host_create(const ENetAddress*, size_t, size_t, enet_uint32, enet_uint32);
  645. ENET_API void enet_host_destroy(ENetHost*);
  646. ENET_API void enet_host_enable_compression(ENetHost*);
  647. ENET_API void enet_host_prevent_connections(ENetHost*, enet_uint8);
  648. ENET_API ENetPeer* enet_host_connect(ENetHost*, const ENetAddress*, size_t, enet_uint32);
  649. ENET_API int enet_host_check_events(ENetHost*, ENetEvent*);
  650. ENET_API int enet_host_service(ENetHost*, ENetEvent*, enet_uint32);
  651. ENET_API void enet_host_flush(ENetHost*);
  652. ENET_API void enet_host_broadcast(ENetHost*, enet_uint8, ENetPacket*);
  653. ENET_API void enet_host_broadcast_selective(ENetHost*, enet_uint8, ENetPacket*, ENetPeer**, size_t);
  654. ENET_API void enet_host_channel_limit(ENetHost*, size_t);
  655. ENET_API void enet_host_bandwidth_limit(ENetHost*, enet_uint32, enet_uint32);
  656. ENET_API int enet_peer_send(ENetPeer*, enet_uint8, ENetPacket*);
  657. ENET_API ENetPacket* enet_peer_receive(ENetPeer*, enet_uint8* channelID);
  658. ENET_API void enet_peer_ping(ENetPeer*);
  659. ENET_API void enet_peer_ping_interval(ENetPeer*, enet_uint32);
  660. ENET_API void enet_peer_timeout(ENetPeer*, enet_uint32, enet_uint32, enet_uint32);
  661. ENET_API void enet_peer_reset(ENetPeer*);
  662. ENET_API void enet_peer_disconnect(ENetPeer*, enet_uint32);
  663. ENET_API void enet_peer_disconnect_now(ENetPeer*, enet_uint32);
  664. ENET_API void enet_peer_disconnect_later(ENetPeer*, enet_uint32);
  665. ENET_API void enet_peer_throttle_configure(ENetPeer*, enet_uint32, enet_uint32, enet_uint32);
  666. /* Extended API for easier binding in other programming languages */
  667. ENET_API void* enet_packet_get_data(ENetPacket*);
  668. ENET_API int enet_packet_get_length(ENetPacket*);
  669. ENET_API void enet_packet_set_free_callback(ENetPacket*, const void*);
  670. ENET_API int enet_packet_check_references(ENetPacket*);
  671. ENET_API void enet_packet_dispose(ENetPacket*);
  672. ENET_API enet_uint32 enet_host_get_peers_count(ENetHost*);
  673. ENET_API enet_uint32 enet_host_get_packets_sent(ENetHost*);
  674. ENET_API enet_uint32 enet_host_get_packets_received(ENetHost*);
  675. ENET_API enet_uint32 enet_host_get_bytes_sent(ENetHost*);
  676. ENET_API enet_uint32 enet_host_get_bytes_received(ENetHost*);
  677. ENET_API enet_uint32 enet_peer_get_id(ENetPeer*);
  678. ENET_API int enet_peer_get_ip(ENetPeer*, char* ip, size_t ipLength);
  679. ENET_API enet_uint16 enet_peer_get_port(ENetPeer*);
  680. ENET_API enet_uint32 enet_peer_get_mtu(ENetPeer*);
  681. ENET_API ENetPeerState enet_peer_get_state(ENetPeer*);
  682. ENET_API enet_uint32 enet_peer_get_rtt(ENetPeer*);
  683. ENET_API enet_uint32 enet_peer_get_lastsendtime(ENetPeer*);
  684. ENET_API enet_uint32 enet_peer_get_lastreceivetime(ENetPeer*);
  685. ENET_API enet_uint64 enet_peer_get_packets_sent(ENetPeer*);
  686. ENET_API enet_uint32 enet_peer_get_packets_lost(ENetPeer*);
  687. ENET_API enet_uint64 enet_peer_get_bytes_sent(ENetPeer*);
  688. ENET_API enet_uint64 enet_peer_get_bytes_received(ENetPeer*);
  689. ENET_API void* enet_peer_get_data(ENetPeer*);
  690. ENET_API void enet_peer_set_data(ENetPeer*, const void*);
  691. // =======================================================================//
  692. // !
  693. // ! Private API
  694. // !
  695. // =======================================================================//
  696. extern void enet_host_bandwidth_throttle(ENetHost*);
  697. extern enet_uint64 enet_host_random_seed(void);
  698. extern int enet_peer_throttle(ENetPeer*, enet_uint32);
  699. extern void enet_peer_reset_queues(ENetPeer*);
  700. extern void enet_peer_setup_outgoing_command(ENetPeer*, ENetOutgoingCommand*);
  701. extern ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer*, const ENetProtocol*, ENetPacket*, enet_uint32, enet_uint16);
  702. extern ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer*, const ENetProtocol*, const void*, size_t, enet_uint32, enet_uint32);
  703. extern ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer*, const ENetProtocol*, enet_uint16);
  704. extern void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer*, ENetChannel*);
  705. extern void enet_peer_dispatch_incoming_reliable_commands(ENetPeer*, ENetChannel*);
  706. extern void enet_peer_on_connect(ENetPeer*);
  707. extern void enet_peer_on_disconnect(ENetPeer*);
  708. extern size_t enet_protocol_command_size(enet_uint8);
  709. #ifdef __cplusplus
  710. }
  711. #endif
  712. #if defined(ENET_IMPLEMENTATION) && !defined(ENET_IMPLEMENTATION_DONE)
  713. #define ENET_IMPLEMENTATION_DONE 1
  714. #ifdef __cplusplus
  715. extern "C" {
  716. #endif
  717. // =======================================================================//
  718. // !
  719. // ! Atomics
  720. // !
  721. // =======================================================================//
  722. #ifdef _MSC_VER
  723. #define ENET_AT_CASSERT_PRED(predicate) sizeof(char[2 * !!(predicate) - 1])
  724. #define ENET_IS_SUPPORTED_ATOMIC(size) ENET_AT_CASSERT_PRED(size == 1 || size == 2 || size == 4 || size == 8)
  725. #define ENET_ATOMIC_SIZEOF(variable) (ENET_IS_SUPPORTED_ATOMIC(sizeof(*(variable))), sizeof(*(variable)))
  726. __inline int64_t enet_at_atomic_read(char* ptr, size_t size) {
  727. switch (size) {
  728. case 1:
  729. return _InterlockedExchangeAdd8((volatile char*)ptr, 0);
  730. case 2:
  731. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, 0);
  732. case 4:
  733. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  734. return InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  735. #else
  736. return _InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  737. #endif
  738. case 8:
  739. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  740. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  741. #else
  742. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  743. #endif
  744. default:
  745. return 0x0;
  746. }
  747. }
  748. __inline int64_t enet_at_atomic_write(char* ptr, int64_t value, size_t size) {
  749. switch (size) {
  750. case 1:
  751. return _InterlockedExchange8((volatile char*)ptr, (char)value);
  752. case 2:
  753. return _InterlockedExchange16((volatile SHORT*)ptr, (SHORT)value);
  754. case 4:
  755. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  756. return InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  757. #else
  758. return _InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  759. #endif
  760. case 8:
  761. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  762. return InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  763. #else
  764. return _InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  765. #endif
  766. default:
  767. return 0x0;
  768. }
  769. }
  770. __inline int64_t enet_at_atomic_cas(char* ptr, int64_t new_val, int64_t old_val, size_t size) {
  771. switch (size) {
  772. case 1:
  773. return _InterlockedCompareExchange8((volatile char*)ptr, (char)new_val, (char)old_val);
  774. case 2:
  775. return _InterlockedCompareExchange16((volatile SHORT*)ptr, (SHORT)new_val, (SHORT)old_val);
  776. case 4:
  777. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  778. return InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  779. #else
  780. return _InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  781. #endif
  782. case 8:
  783. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  784. return InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  785. #else
  786. return _InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  787. #endif
  788. default:
  789. return 0x0;
  790. }
  791. }
  792. __inline int64_t enet_at_atomic_inc(char* ptr, int64_t delta, size_t data_size) {
  793. switch (data_size) {
  794. case 1:
  795. return _InterlockedExchangeAdd8((volatile char*)ptr, (char)delta);
  796. case 2:
  797. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, (SHORT)delta);
  798. case 4:
  799. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  800. return InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  801. #else
  802. return _InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  803. #endif
  804. case 8:
  805. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  806. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  807. #else
  808. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  809. #endif
  810. default:
  811. return 0x0;
  812. }
  813. }
  814. #define ENET_ATOMIC_READ(variable) enet_at_atomic_read((char*)(variable), ENET_ATOMIC_SIZEOF(variable))
  815. #define ENET_ATOMIC_WRITE(variable, new_val) enet_at_atomic_write((char*)(variable), (int64_t)(new_val), ENET_ATOMIC_SIZEOF(variable))
  816. #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))
  817. #define ENET_ATOMIC_INC(variable) enet_at_atomic_inc((char*)(variable), 1, ENET_ATOMIC_SIZEOF(variable))
  818. #define ENET_ATOMIC_DEC(variable) enet_at_atomic_inc((char*)(variable), -1, ENET_ATOMIC_SIZEOF(variable))
  819. #define ENET_ATOMIC_INC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), (delta), ENET_ATOMIC_SIZEOF(variable))
  820. #define ENET_ATOMIC_DEC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), -(delta), ENET_ATOMIC_SIZEOF(variable))
  821. #elif defined(__GNUC__) || defined(__clang__)
  822. #if defined(__clang__) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
  823. #define AT_HAVE_ATOMICS
  824. #endif
  825. /* We want to use __atomic built-ins if possible because the __sync primitives are
  826. deprecated, because the __atomic build-ins allow us to use ENET_ATOMIC_WRITE on
  827. uninitialized memory without running into undefined behavior, and because the
  828. __atomic versions generate more efficient code since we don't need to rely on
  829. CAS when we don't actually want it.
  830. Note that we use acquire-release memory order (like mutexes do). We could use
  831. sequentially consistent memory order but that has lower performance and is
  832. almost always unneeded. */
  833. #ifdef AT_HAVE_ATOMICS
  834. #define ENET_ATOMIC_READ(ptr) __atomic_load_n((ptr), __ATOMIC_ACQUIRE)
  835. #define ENET_ATOMIC_WRITE(ptr, value) __atomic_store_n((ptr), (value), __ATOMIC_RELEASE)
  836. #ifndef typeof
  837. #define typeof __typeof__
  838. #endif
  839. /* clang_analyzer doesn't know that CAS writes to memory so it complains about
  840. potentially lost data. Replace the code with the equivalent non-sync code. */
  841. #ifdef __clang_analyzer__
  842. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  843. ({ \
  844. typeof(*(ptr)) ENET_ATOMIC_CAS_old_actual_ = (*(ptr)); \
  845. if (ATOMIC_CAS_old_actual_ == (old_value)) { \
  846. *(ptr) = new_value; \
  847. } \
  848. ENET_ATOMIC_CAS_old_actual_; \
  849. })
  850. #else
  851. /* Could use __auto_type instead of typeof but that shouldn't work in C++.
  852. The ({ }) syntax is a GCC extension called statement expression. It lets
  853. us return a value out of the macro.
  854. TODO We should return bool here instead of the old value to avoid the ABA
  855. problem. */
  856. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  857. ({ \
  858. typeof(*(ptr)) ENET_ATOMIC_CAS_expected_ = (old_value); \
  859. __atomic_compare_exchange_n((ptr), &ENET_ATOMIC_CAS_expected_, (new_value), false, \
  860. __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE); \
  861. ENET_ATOMIC_CAS_expected_; \
  862. })
  863. #endif
  864. #define ENET_ATOMIC_INC(ptr) __atomic_fetch_add((ptr), 1, __ATOMIC_ACQ_REL)
  865. #define ENET_ATOMIC_DEC(ptr) __atomic_fetch_sub((ptr), 1, __ATOMIC_ACQ_REL)
  866. #define ENET_ATOMIC_INC_BY(ptr, delta) __atomic_fetch_add((ptr), (delta), __ATOMIC_ACQ_REL)
  867. #define ENET_ATOMIC_DEC_BY(ptr, delta) __atomic_fetch_sub((ptr), (delta), __ATOMIC_ACQ_REL)
  868. #else
  869. #define ENET_ATOMIC_READ(variable) __sync_fetch_and_add(variable, 0)
  870. #define ENET_ATOMIC_WRITE(variable, new_val) (void)__sync_val_compare_and_swap((variable), *(variable), (new_val))
  871. #define ENET_ATOMIC_CAS(variable, old_value, new_val) __sync_val_compare_and_swap((variable), (old_value), (new_val))
  872. #define ENET_ATOMIC_INC(variable) __sync_fetch_and_add((variable), 1)
  873. #define ENET_ATOMIC_DEC(variable) __sync_fetch_and_sub((variable), 1)
  874. #define ENET_ATOMIC_INC_BY(variable, delta) __sync_fetch_and_add((variable), (delta), 1)
  875. #define ENET_ATOMIC_DEC_BY(variable, delta) __sync_fetch_and_sub((variable), (delta), 1)
  876. #endif
  877. #undef AT_HAVE_ATOMICS
  878. #endif
  879. // =======================================================================//
  880. // !
  881. // ! Globals
  882. // !
  883. // =======================================================================//
  884. ENetVersion enet_linked_version(void) {
  885. return ENET_VERSION;
  886. }
  887. // =======================================================================//
  888. // !
  889. // ! Callbacks
  890. // !
  891. // =======================================================================//
  892. static ENetCallbacks callbacks = { malloc, free, abort };
  893. int enet_initialize_with_callbacks(ENetVersion version, const ENetCallbacks* inits) {
  894. if (version < ENET_VERSION_CREATE(1, 3, 0))
  895. return -1;
  896. if (inits->malloc != NULL || inits->free != NULL) {
  897. if (inits->malloc == NULL || inits->free == NULL)
  898. return -1;
  899. callbacks.malloc = inits->malloc;
  900. callbacks.free = inits->free;
  901. }
  902. if (inits->noMemory != NULL)
  903. callbacks.noMemory = inits->noMemory;
  904. return enet_initialize();
  905. }
  906. void* enet_malloc(size_t size) {
  907. void* memory = callbacks.malloc(size);
  908. if (memory == NULL)
  909. callbacks.noMemory();
  910. return memory;
  911. }
  912. void enet_free(void* memory) {
  913. callbacks.free(memory);
  914. }
  915. // =======================================================================//
  916. // !
  917. // ! List
  918. // !
  919. // =======================================================================//
  920. void enet_list_clear(ENetList* list) {
  921. list->sentinel.next = &list->sentinel;
  922. list->sentinel.previous = &list->sentinel;
  923. }
  924. ENetListIterator enet_list_insert(ENetListIterator position, void* data) {
  925. ENetListIterator result = (ENetListIterator)data;
  926. result->previous = position->previous;
  927. result->next = position;
  928. result->previous->next = result;
  929. position->previous = result;
  930. return result;
  931. }
  932. void* enet_list_remove(ENetListIterator position) {
  933. position->previous->next = position->next;
  934. position->next->previous = position->previous;
  935. return position;
  936. }
  937. ENetListIterator enet_list_move(ENetListIterator position, void* dataFirst, void* dataLast) {
  938. ENetListIterator first = (ENetListIterator)dataFirst;
  939. ENetListIterator last = (ENetListIterator)dataLast;
  940. first->previous->next = last->next;
  941. last->next->previous = first->previous;
  942. first->previous = position->previous;
  943. last->next = position;
  944. first->previous->next = first;
  945. position->previous = last;
  946. return first;
  947. }
  948. size_t enet_list_size(ENetList* list) {
  949. size_t size = 0;
  950. ENetListIterator position;
  951. for (position = enet_list_begin(list); position != enet_list_end(list); position = enet_list_next(position)) {
  952. ++size;
  953. }
  954. return size;
  955. }
  956. // =======================================================================//
  957. // !
  958. // ! Packet
  959. // !
  960. // =======================================================================//
  961. ENetPacket* enet_packet_create(const void* data, size_t dataLength, enet_uint32 flags) {
  962. ENetPacket* packet;
  963. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  964. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  965. if (packet == NULL)
  966. return NULL;
  967. packet->data = (enet_uint8*)data;
  968. } else {
  969. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength);
  970. if (packet == NULL)
  971. return NULL;
  972. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  973. if (data != NULL)
  974. memcpy(packet->data, data, dataLength);
  975. }
  976. packet->referenceCount = 0;
  977. packet->flags = flags;
  978. packet->dataLength = dataLength;
  979. packet->freeCallback = NULL;
  980. return packet;
  981. }
  982. ENetPacket* enet_packet_create_offset(const void* data, size_t dataLength, size_t dataOffset, enet_uint32 flags) {
  983. ENetPacket* packet;
  984. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  985. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  986. if (packet == NULL)
  987. return NULL;
  988. packet->data = (enet_uint8*)data;
  989. } else {
  990. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength + dataOffset);
  991. if (packet == NULL)
  992. return NULL;
  993. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  994. if (data != NULL)
  995. memcpy(packet->data + dataOffset, data, dataLength);
  996. }
  997. packet->referenceCount = 0;
  998. packet->flags = flags;
  999. packet->dataLength = dataLength + dataOffset;
  1000. packet->freeCallback = NULL;
  1001. return packet;
  1002. }
  1003. void enet_packet_destroy(ENetPacket* packet) {
  1004. if (packet == NULL)
  1005. return;
  1006. if (packet->freeCallback != NULL)
  1007. (*packet->freeCallback)((void*)packet);
  1008. enet_free(packet);
  1009. }
  1010. static int initializedCRC32 = 0;
  1011. static enet_uint32 crcTable[256];
  1012. static enet_uint32 reflect_crc(int val, int bits) {
  1013. int result = 0, bit;
  1014. for (bit = 0; bit < bits; bit++) {
  1015. if (val & 1)
  1016. result |= 1 << (bits - 1 - bit);
  1017. val >>= 1;
  1018. }
  1019. return result;
  1020. }
  1021. static void initialize_crc32(void) {
  1022. int byte;
  1023. for (byte = 0; byte < 256; ++byte) {
  1024. enet_uint32 crc = reflect_crc(byte, 8) << 24;
  1025. int offset;
  1026. for (offset = 0; offset < 8; ++offset) {
  1027. if (crc & 0x80000000)
  1028. crc = (crc << 1) ^ 0x04c11db7;
  1029. else
  1030. crc <<= 1;
  1031. }
  1032. crcTable[byte] = reflect_crc(crc, 32);
  1033. }
  1034. initializedCRC32 = 1;
  1035. }
  1036. enet_uint32 enet_crc32(const ENetBuffer* buffers, size_t bufferCount) {
  1037. enet_uint32 crc = 0xFFFFFFFF;
  1038. if (!initializedCRC32)
  1039. initialize_crc32();
  1040. while (bufferCount-- > 0) {
  1041. const enet_uint8* data = (const enet_uint8*)buffers->data;
  1042. const enet_uint8* dataEnd = &data[buffers->dataLength];
  1043. while (data < dataEnd) {
  1044. crc = (crc >> 8) ^ crcTable[(crc & 0xFF)^* data++];
  1045. }
  1046. ++buffers;
  1047. }
  1048. return ENET_HOST_TO_NET_32(~crc);
  1049. }
  1050. // =======================================================================//
  1051. // !
  1052. // ! Protocol
  1053. // !
  1054. // =======================================================================//
  1055. static size_t commandSizes[ENET_PROTOCOL_COMMAND_COUNT] = {
  1056. 0,
  1057. sizeof(ENetProtocolAcknowledge),
  1058. sizeof(ENetProtocolConnect),
  1059. sizeof(ENetProtocolVerifyConnect),
  1060. sizeof(ENetProtocolDisconnect),
  1061. sizeof(ENetProtocolPing),
  1062. sizeof(ENetProtocolSendReliable),
  1063. sizeof(ENetProtocolSendUnreliable),
  1064. sizeof(ENetProtocolSendFragment),
  1065. sizeof(ENetProtocolSendUnsequenced),
  1066. sizeof(ENetProtocolBandwidthLimit),
  1067. sizeof(ENetProtocolThrottleConfigure),
  1068. sizeof(ENetProtocolSendFragment)
  1069. };
  1070. size_t enet_protocol_command_size(enet_uint8 commandNumber) {
  1071. return commandSizes[commandNumber & ENET_PROTOCOL_COMMAND_MASK];
  1072. }
  1073. static void enet_protocol_change_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1074. if (state == ENET_PEER_STATE_CONNECTED || state == ENET_PEER_STATE_DISCONNECT_LATER)
  1075. enet_peer_on_connect(peer);
  1076. else
  1077. enet_peer_on_disconnect(peer);
  1078. peer->state = state;
  1079. }
  1080. static void enet_protocol_dispatch_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1081. enet_protocol_change_state(host, peer, state);
  1082. if (!peer->needsDispatch) {
  1083. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1084. peer->needsDispatch = 1;
  1085. }
  1086. }
  1087. static int enet_protocol_dispatch_incoming_commands(ENetHost* host, ENetEvent* event) {
  1088. while (!enet_list_empty(&host->dispatchQueue)) {
  1089. ENetPeer* peer = (ENetPeer*)enet_list_remove(enet_list_begin(&host->dispatchQueue));
  1090. peer->needsDispatch = 0;
  1091. switch (peer->state) {
  1092. case ENET_PEER_STATE_CONNECTION_PENDING:
  1093. case ENET_PEER_STATE_CONNECTION_SUCCEEDED:
  1094. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1095. event->type = ENET_EVENT_TYPE_CONNECT;
  1096. event->peer = peer;
  1097. event->data = peer->eventData;
  1098. return 1;
  1099. case ENET_PEER_STATE_ZOMBIE:
  1100. host->recalculateBandwidthLimits = 1;
  1101. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1102. event->peer = peer;
  1103. event->data = peer->eventData;
  1104. enet_peer_reset(peer);
  1105. return 1;
  1106. case ENET_PEER_STATE_CONNECTED:
  1107. if (enet_list_empty(&peer->dispatchedCommands))
  1108. continue;
  1109. event->packet = enet_peer_receive(peer, &event->channelID);
  1110. if (event->packet == NULL)
  1111. continue;
  1112. event->type = ENET_EVENT_TYPE_RECEIVE;
  1113. event->peer = peer;
  1114. if (!enet_list_empty(&peer->dispatchedCommands)) {
  1115. peer->needsDispatch = 1;
  1116. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1117. }
  1118. return 1;
  1119. default:
  1120. break;
  1121. }
  1122. }
  1123. return 0;
  1124. }
  1125. static void enet_protocol_notify_connect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1126. host->recalculateBandwidthLimits = 1;
  1127. if (event != NULL) {
  1128. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1129. peer->totalDataSent = 0;
  1130. peer->totalDataReceived = 0;
  1131. peer->totalPacketsSent = 0;
  1132. peer->totalPacketsLost = 0;
  1133. event->type = ENET_EVENT_TYPE_CONNECT;
  1134. event->peer = peer;
  1135. event->data = peer->eventData;
  1136. } else {
  1137. enet_protocol_dispatch_state(host, peer, peer->state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING);
  1138. }
  1139. }
  1140. static void enet_protocol_notify_disconnect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1141. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1142. host->recalculateBandwidthLimits = 1;
  1143. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1144. enet_peer_reset(peer);
  1145. } else if (event != NULL) {
  1146. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1147. event->peer = peer;
  1148. event->data = 0;
  1149. enet_peer_reset(peer);
  1150. } else {
  1151. peer->eventData = 0;
  1152. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1153. }
  1154. }
  1155. static void enet_protocol_notify_disconnect_timeout(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1156. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1157. host->recalculateBandwidthLimits = 1;
  1158. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1159. enet_peer_reset(peer);
  1160. } else if (event != NULL) {
  1161. event->type = ENET_EVENT_TYPE_DISCONNECT_TIMEOUT;
  1162. event->peer = peer;
  1163. event->data = 0;
  1164. enet_peer_reset(peer);
  1165. } else {
  1166. peer->eventData = 0;
  1167. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1168. }
  1169. }
  1170. static void enet_protocol_remove_sent_unreliable_commands(ENetPeer* peer) {
  1171. ENetOutgoingCommand* outgoingCommand;
  1172. if (enet_list_empty(&peer->sentUnreliableCommands))
  1173. return;
  1174. do {
  1175. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentUnreliableCommands);
  1176. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1177. if (outgoingCommand->packet != NULL) {
  1178. --outgoingCommand->packet->referenceCount;
  1179. if (outgoingCommand->packet->referenceCount == 0) {
  1180. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1181. enet_packet_destroy(outgoingCommand->packet);
  1182. }
  1183. }
  1184. enet_free(outgoingCommand);
  1185. }
  1186. while (!enet_list_empty(&peer->sentUnreliableCommands));
  1187. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1188. enet_peer_disconnect(peer, peer->eventData);
  1189. }
  1190. static ENetProtocolCommand enet_protocol_remove_sent_reliable_command(ENetPeer* peer, enet_uint16 reliableSequenceNumber, enet_uint8 channelID) {
  1191. ENetOutgoingCommand* outgoingCommand = NULL;
  1192. ENetListIterator currentCommand;
  1193. ENetProtocolCommand commandNumber;
  1194. int wasSent = 1;
  1195. for (currentCommand = enet_list_begin(&peer->sentReliableCommands); currentCommand != enet_list_end(&peer->sentReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1196. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1197. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1198. break;
  1199. }
  1200. if (currentCommand == enet_list_end(&peer->sentReliableCommands)) {
  1201. for (currentCommand = enet_list_begin(&peer->outgoingReliableCommands); currentCommand != enet_list_end(&peer->outgoingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1202. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1203. if (outgoingCommand->sendAttempts < 1)
  1204. return ENET_PROTOCOL_COMMAND_NONE;
  1205. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1206. break;
  1207. }
  1208. if (currentCommand == enet_list_end(&peer->outgoingReliableCommands))
  1209. return ENET_PROTOCOL_COMMAND_NONE;
  1210. wasSent = 0;
  1211. }
  1212. if (outgoingCommand == NULL)
  1213. return ENET_PROTOCOL_COMMAND_NONE;
  1214. if (channelID < peer->channelCount) {
  1215. ENetChannel* channel = &peer->channels[channelID];
  1216. enet_uint16 reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1217. if (channel->reliableWindows[reliableWindow] > 0) {
  1218. --channel->reliableWindows[reliableWindow];
  1219. if (!channel->reliableWindows[reliableWindow])
  1220. channel->usedReliableWindows &= ~(1 << reliableWindow);
  1221. }
  1222. }
  1223. commandNumber = (ENetProtocolCommand)(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK);
  1224. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1225. if (outgoingCommand->packet != NULL) {
  1226. if (wasSent)
  1227. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  1228. --outgoingCommand->packet->referenceCount;
  1229. if (outgoingCommand->packet->referenceCount == 0) {
  1230. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1231. enet_packet_destroy(outgoingCommand->packet);
  1232. }
  1233. }
  1234. enet_free(outgoingCommand);
  1235. if (enet_list_empty(&peer->sentReliableCommands))
  1236. return commandNumber;
  1237. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentReliableCommands);
  1238. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  1239. return commandNumber;
  1240. }
  1241. static ENetPeer* enet_protocol_handle_connect(ENetHost* host, ENetProtocolHeader* header, ENetProtocol* command) {
  1242. enet_uint8 incomingSessionID, outgoingSessionID;
  1243. enet_uint32 mtu, windowSize;
  1244. ENetChannel* channel;
  1245. size_t channelCount, duplicatePeers = 0;
  1246. ENetPeer* currentPeer, *peer = NULL;
  1247. ENetProtocol verifyCommand;
  1248. channelCount = ENET_NET_TO_HOST_32(command->connect.channelCount);
  1249. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  1250. return NULL;
  1251. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  1252. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED) {
  1253. if (peer == NULL)
  1254. peer = currentPeer;
  1255. } else if (currentPeer->state != ENET_PEER_STATE_CONNECTING && in6_equal(currentPeer->address.host, host->receivedAddress.host)) {
  1256. if (currentPeer->address.port == host->receivedAddress.port && currentPeer->connectID == command->connect.connectID)
  1257. return NULL;
  1258. ++duplicatePeers;
  1259. }
  1260. }
  1261. if (peer == NULL || duplicatePeers >= host->duplicatePeers)
  1262. return NULL;
  1263. if (channelCount > host->channelLimit)
  1264. channelCount = host->channelLimit;
  1265. peer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  1266. if (peer->channels == NULL)
  1267. return NULL;
  1268. peer->channelCount = channelCount;
  1269. peer->state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
  1270. peer->connectID = command->connect.connectID;
  1271. peer->address = host->receivedAddress;
  1272. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->connect.outgoingPeerID);
  1273. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->connect.incomingBandwidth);
  1274. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->connect.outgoingBandwidth);
  1275. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->connect.packetThrottleInterval);
  1276. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleAcceleration);
  1277. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleDeceleration);
  1278. peer->eventData = ENET_NET_TO_HOST_32(command->connect.data);
  1279. incomingSessionID = command->connect.incomingSessionID == 0xFF ? peer->outgoingSessionID : command->connect.incomingSessionID;
  1280. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1281. if (incomingSessionID == peer->outgoingSessionID)
  1282. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1283. peer->outgoingSessionID = incomingSessionID;
  1284. outgoingSessionID = command->connect.outgoingSessionID == 0xFF ? peer->incomingSessionID : command->connect.outgoingSessionID;
  1285. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1286. if (outgoingSessionID == peer->incomingSessionID)
  1287. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1288. peer->incomingSessionID = outgoingSessionID;
  1289. for (channel = peer->channels; channel < &peer->channels[channelCount]; ++channel) {
  1290. channel->outgoingReliableSequenceNumber = 0;
  1291. channel->outgoingUnreliableSequenceNumber = 0;
  1292. channel->incomingReliableSequenceNumber = 0;
  1293. channel->incomingUnreliableSequenceNumber = 0;
  1294. enet_list_clear(&channel->incomingReliableCommands);
  1295. enet_list_clear(&channel->incomingUnreliableCommands);
  1296. channel->usedReliableWindows = 0;
  1297. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  1298. }
  1299. mtu = ENET_NET_TO_HOST_32(command->connect.mtu);
  1300. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1301. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1302. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1303. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1304. peer->mtu = mtu;
  1305. if (host->outgoingBandwidth == 0 && peer->incomingBandwidth == 0)
  1306. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1307. else if (host->outgoingBandwidth == 0 || peer->incomingBandwidth == 0)
  1308. peer->windowSize = (ENET_MAX(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1309. else
  1310. peer->windowSize = (ENET_MIN(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1311. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1312. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1313. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1314. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1315. if (host->incomingBandwidth == 0)
  1316. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1317. else
  1318. windowSize = (host->incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1319. if (windowSize > ENET_NET_TO_HOST_32(command->connect.windowSize))
  1320. windowSize = ENET_NET_TO_HOST_32(command->connect.windowSize);
  1321. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1322. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1323. else if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1324. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1325. verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  1326. verifyCommand.header.channelID = 0xFF;
  1327. verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16(peer->incomingPeerID);
  1328. verifyCommand.verifyConnect.incomingSessionID = incomingSessionID;
  1329. verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID;
  1330. verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_32(peer->mtu);
  1331. verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32(windowSize);
  1332. verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  1333. verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  1334. verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  1335. verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32(peer->packetThrottleInterval);
  1336. verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(peer->packetThrottleAcceleration);
  1337. verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(peer->packetThrottleDeceleration);
  1338. verifyCommand.verifyConnect.connectID = peer->connectID;
  1339. enet_peer_queue_outgoing_command(peer, &verifyCommand, NULL, 0, 0);
  1340. return peer;
  1341. }
  1342. static int enet_protocol_handle_send_reliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1343. size_t dataLength;
  1344. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1345. return -1;
  1346. dataLength = ENET_NET_TO_HOST_16(command->sendReliable.dataLength);
  1347. *currentData += dataLength;
  1348. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1349. return -1;
  1350. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendReliable), dataLength, ENET_PACKET_FLAG_RELIABLE, 0) == NULL)
  1351. return -1;
  1352. return 0;
  1353. }
  1354. static int enet_protocol_handle_send_unsequenced(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1355. enet_uint32 unsequencedGroup, index;
  1356. size_t dataLength;
  1357. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1358. return -1;
  1359. dataLength = ENET_NET_TO_HOST_16(command->sendUnsequenced.dataLength);
  1360. *currentData += dataLength;
  1361. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1362. return -1;
  1363. unsequencedGroup = ENET_NET_TO_HOST_16(command->sendUnsequenced.unsequencedGroup);
  1364. index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
  1365. if (unsequencedGroup < peer->incomingUnsequencedGroup)
  1366. unsequencedGroup += 0x10000;
  1367. if (unsequencedGroup >= (enet_uint32)peer->incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE)
  1368. return 0;
  1369. unsequencedGroup &= 0xFFFF;
  1370. if (unsequencedGroup - index != peer->incomingUnsequencedGroup) {
  1371. peer->incomingUnsequencedGroup = unsequencedGroup - index;
  1372. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  1373. } else if (peer->unsequencedWindow[index / 32] & (1 << (index % 32))) {
  1374. return 0;
  1375. }
  1376. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnsequenced), dataLength, ENET_PACKET_FLAG_UNSEQUENCED, 0) == NULL)
  1377. return -1;
  1378. peer->unsequencedWindow[index / 32] |= 1 << (index % 32);
  1379. return 0;
  1380. }
  1381. static int enet_protocol_handle_send_unreliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1382. size_t dataLength;
  1383. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1384. return -1;
  1385. dataLength = ENET_NET_TO_HOST_16(command->sendUnreliable.dataLength);
  1386. *currentData += dataLength;
  1387. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1388. return -1;
  1389. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnreliable), dataLength, 0, 0) == NULL)
  1390. return -1;
  1391. return 0;
  1392. }
  1393. static int enet_protocol_handle_send_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1394. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, startSequenceNumber, totalLength;
  1395. ENetChannel* channel;
  1396. enet_uint16 startWindow, currentWindow;
  1397. ENetListIterator currentCommand;
  1398. ENetIncomingCommand* startCommand = NULL;
  1399. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1400. return -1;
  1401. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1402. *currentData += fragmentLength;
  1403. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1404. return -1;
  1405. channel = &peer->channels[command->header.channelID];
  1406. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1407. startWindow = startSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1408. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1409. if (startSequenceNumber < channel->incomingReliableSequenceNumber)
  1410. startWindow += ENET_PEER_RELIABLE_WINDOWS;
  1411. if (startWindow < currentWindow || startWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1412. return 0;
  1413. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1414. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1415. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1416. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1417. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1418. return -1;
  1419. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1420. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1421. if (startSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1422. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1423. continue;
  1424. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1425. break;
  1426. }
  1427. if (incomingCommand->reliableSequenceNumber <= startSequenceNumber) {
  1428. if (incomingCommand->reliableSequenceNumber < startSequenceNumber)
  1429. break;
  1430. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1431. return -1;
  1432. startCommand = incomingCommand;
  1433. break;
  1434. }
  1435. }
  1436. if (startCommand == NULL) {
  1437. ENetProtocol hostCommand = *command;
  1438. hostCommand.header.reliableSequenceNumber = startSequenceNumber;
  1439. startCommand = enet_peer_queue_incoming_command(peer, &hostCommand, NULL, totalLength, ENET_PACKET_FLAG_RELIABLE, fragmentCount);
  1440. if (startCommand == NULL)
  1441. return -1;
  1442. }
  1443. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1444. --startCommand->fragmentsRemaining;
  1445. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1446. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1447. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1448. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1449. if (startCommand->fragmentsRemaining <= 0)
  1450. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  1451. }
  1452. return 0;
  1453. }
  1454. static int enet_protocol_handle_send_unreliable_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1455. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, reliableSequenceNumber, startSequenceNumber, totalLength;
  1456. enet_uint16 reliableWindow, currentWindow;
  1457. ENetChannel* channel;
  1458. ENetListIterator currentCommand;
  1459. ENetIncomingCommand* startCommand = NULL;
  1460. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1461. return -1;
  1462. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1463. *currentData += fragmentLength;
  1464. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1465. return -1;
  1466. channel = &peer->channels[command->header.channelID];
  1467. reliableSequenceNumber = command->header.reliableSequenceNumber;
  1468. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1469. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1470. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1471. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1472. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  1473. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1474. return 0;
  1475. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && startSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  1476. return 0;
  1477. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1478. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1479. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1480. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1481. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1482. return -1;
  1483. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1484. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1485. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1486. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1487. continue;
  1488. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1489. break;
  1490. }
  1491. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  1492. break;
  1493. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  1494. continue;
  1495. if (incomingCommand->unreliableSequenceNumber <= startSequenceNumber) {
  1496. if (incomingCommand->unreliableSequenceNumber < startSequenceNumber)
  1497. break;
  1498. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1499. return -1;
  1500. startCommand = incomingCommand;
  1501. break;
  1502. }
  1503. }
  1504. if (startCommand == NULL) {
  1505. startCommand = enet_peer_queue_incoming_command(peer, command, NULL, totalLength,
  1506. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT, fragmentCount);
  1507. if (startCommand == NULL)
  1508. return -1;
  1509. }
  1510. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1511. --startCommand->fragmentsRemaining;
  1512. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1513. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1514. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1515. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1516. if (startCommand->fragmentsRemaining <= 0)
  1517. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  1518. }
  1519. return 0;
  1520. }
  1521. static int enet_protocol_handle_ping(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1522. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1523. return -1;
  1524. return 0;
  1525. }
  1526. static int enet_protocol_handle_bandwidth_limit(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1527. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1528. return -1;
  1529. if (peer->incomingBandwidth != 0)
  1530. --host->bandwidthLimitedPeers;
  1531. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.incomingBandwidth);
  1532. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.outgoingBandwidth);
  1533. if (peer->incomingBandwidth != 0)
  1534. ++host->bandwidthLimitedPeers;
  1535. if (peer->incomingBandwidth == 0 && host->outgoingBandwidth == 0)
  1536. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1537. else if (peer->incomingBandwidth == 0 || host->outgoingBandwidth == 0)
  1538. peer->windowSize = (ENET_MAX(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1539. else
  1540. peer->windowSize = (ENET_MIN(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1541. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1542. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1543. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1544. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1545. return 0;
  1546. }
  1547. static int enet_protocol_handle_throttle_configure(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1548. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1549. return -1;
  1550. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleInterval);
  1551. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleAcceleration);
  1552. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleDeceleration);
  1553. return 0;
  1554. }
  1555. static int enet_protocol_handle_disconnect(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1556. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT)
  1557. return 0;
  1558. enet_peer_reset_queues(peer);
  1559. if (peer->state == ENET_PEER_STATE_CONNECTION_SUCCEEDED || peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_CONNECTING) {
  1560. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1561. } else if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1562. if (peer->state == ENET_PEER_STATE_CONNECTION_PENDING)
  1563. host->recalculateBandwidthLimits = 1;
  1564. enet_peer_reset(peer);
  1565. } else if (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  1566. enet_protocol_change_state(host, peer, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT);
  1567. } else {
  1568. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1569. }
  1570. if (peer->state != ENET_PEER_STATE_DISCONNECTED)
  1571. peer->eventData = ENET_NET_TO_HOST_32(command->disconnect.data);
  1572. return 0;
  1573. }
  1574. static int enet_protocol_handle_acknowledge(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1575. enet_uint32 roundTripTime, receivedSentTime, receivedReliableSequenceNumber;
  1576. ENetProtocolCommand commandNumber;
  1577. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE)
  1578. return 0;
  1579. receivedSentTime = ENET_NET_TO_HOST_16(command->acknowledge.receivedSentTime);
  1580. receivedSentTime |= host->serviceTime & 0xFFFF0000;
  1581. if ((receivedSentTime & 0x8000) > (host->serviceTime & 0x8000))
  1582. receivedSentTime -= 0x10000;
  1583. if (ENET_TIME_LESS(host->serviceTime, receivedSentTime))
  1584. return 0;
  1585. peer->lastReceiveTime = host->serviceTime;
  1586. peer->earliestTimeout = 0;
  1587. roundTripTime = ENET_TIME_DIFFERENCE(host->serviceTime, receivedSentTime);
  1588. if (roundTripTime == 0)
  1589. roundTripTime = 1;
  1590. if (peer->smoothedRoundTripTime == 0)
  1591. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * ENET_SRTT_INITIAL + ENET_SRTT_PARA_G * roundTripTime);
  1592. else
  1593. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * peer->smoothedRoundTripTime + ENET_SRTT_PARA_G * roundTripTime);
  1594. enet_peer_throttle(peer, peer->smoothedRoundTripTime);
  1595. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1596. if (peer->smoothedRoundTripTime >= peer->roundTripTime) {
  1597. peer->roundTripTime += (peer->smoothedRoundTripTime - peer->roundTripTime) / 8;
  1598. peer->roundTripTimeVariance += (peer->smoothedRoundTripTime - peer->roundTripTime) / 4;
  1599. } else {
  1600. peer->roundTripTime -= (peer->roundTripTime - peer->smoothedRoundTripTime) / 8;
  1601. peer->roundTripTimeVariance += (peer->roundTripTime - peer->smoothedRoundTripTime) / 4;
  1602. }
  1603. if (peer->roundTripTime < peer->lowestRoundTripTime)
  1604. peer->lowestRoundTripTime = peer->roundTripTime;
  1605. if (peer->roundTripTimeVariance > peer->highestRoundTripTimeVariance)
  1606. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1607. if (peer->packetThrottleEpoch == 0 ||
  1608. ENET_TIME_DIFFERENCE(host->serviceTime, peer->packetThrottleEpoch) >= peer->packetThrottleInterval) {
  1609. peer->lastRoundTripTime = peer->lowestRoundTripTime;
  1610. peer->lastRoundTripTimeVariance = peer->highestRoundTripTimeVariance;
  1611. peer->lowestRoundTripTime = peer->roundTripTime;
  1612. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1613. peer->packetThrottleEpoch = host->serviceTime;
  1614. }
  1615. receivedReliableSequenceNumber = ENET_NET_TO_HOST_16(command->acknowledge.receivedReliableSequenceNumber);
  1616. commandNumber = enet_protocol_remove_sent_reliable_command(peer, receivedReliableSequenceNumber, command->header.channelID);
  1617. switch (peer->state) {
  1618. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1619. if (commandNumber != ENET_PROTOCOL_COMMAND_VERIFY_CONNECT)
  1620. return -1;
  1621. enet_protocol_notify_connect(host, peer, event);
  1622. break;
  1623. case ENET_PEER_STATE_DISCONNECTING:
  1624. if (commandNumber != ENET_PROTOCOL_COMMAND_DISCONNECT)
  1625. return -1;
  1626. enet_protocol_notify_disconnect(host, peer, event);
  1627. break;
  1628. case ENET_PEER_STATE_DISCONNECT_LATER:
  1629. if (enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1630. enet_peer_disconnect(peer, peer->eventData);
  1631. break;
  1632. default:
  1633. break;
  1634. }
  1635. return 0;
  1636. }
  1637. static int enet_protocol_handle_verify_connect(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1638. enet_uint32 mtu, windowSize;
  1639. size_t channelCount;
  1640. if (peer->state != ENET_PEER_STATE_CONNECTING)
  1641. return 0;
  1642. channelCount = ENET_NET_TO_HOST_32(command->verifyConnect.channelCount);
  1643. 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) {
  1644. peer->eventData = 0;
  1645. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1646. return -1;
  1647. }
  1648. enet_protocol_remove_sent_reliable_command(peer, 1, 0xFF);
  1649. if (channelCount < peer->channelCount)
  1650. peer->channelCount = channelCount;
  1651. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->verifyConnect.outgoingPeerID);
  1652. peer->incomingSessionID = command->verifyConnect.incomingSessionID;
  1653. peer->outgoingSessionID = command->verifyConnect.outgoingSessionID;
  1654. mtu = ENET_NET_TO_HOST_32(command->verifyConnect.mtu);
  1655. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1656. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1657. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1658. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1659. if (mtu < peer->mtu)
  1660. peer->mtu = mtu;
  1661. windowSize = ENET_NET_TO_HOST_32(command->verifyConnect.windowSize);
  1662. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1663. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1664. if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1665. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1666. if (windowSize < peer->windowSize)
  1667. peer->windowSize = windowSize;
  1668. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.incomingBandwidth);
  1669. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.outgoingBandwidth);
  1670. enet_protocol_notify_connect(host, peer, event);
  1671. return 0;
  1672. }
  1673. static int enet_protocol_handle_incoming_commands(ENetHost* host, ENetEvent* event) {
  1674. ENetProtocolHeader* header;
  1675. ENetProtocol* command;
  1676. ENetPeer* peer;
  1677. enet_uint8* currentData;
  1678. size_t headerSize;
  1679. enet_uint16 peerID, flags;
  1680. enet_uint8 sessionID;
  1681. if (host->receivedDataLength < (size_t)&((ENetProtocolHeader*)0)->sentTime)
  1682. return 0;
  1683. header = (ENetProtocolHeader*)host->receivedData;
  1684. peerID = ENET_NET_TO_HOST_16(header->peerID);
  1685. sessionID = (peerID & ENET_PROTOCOL_HEADER_SESSION_MASK) >> ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  1686. flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK;
  1687. peerID &= ~(ENET_PROTOCOL_HEADER_FLAG_MASK | ENET_PROTOCOL_HEADER_SESSION_MASK);
  1688. headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof(ENetProtocolHeader) : (size_t)&((ENetProtocolHeader*)0)->sentTime);
  1689. if (host->checksumCallback != NULL)
  1690. headerSize += sizeof(enet_uint32);
  1691. if (peerID == ENET_PROTOCOL_MAXIMUM_PEER_ID) {
  1692. peer = NULL;
  1693. } else if (peerID >= host->peerCount) {
  1694. return 0;
  1695. } else {
  1696. peer = &host->peers[peerID];
  1697. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || ((!in6_equal(host->receivedAddress.host, peer->address.host) || host->receivedAddress.port != peer->address.port) && 1 /* No broadcast in IPv6 - !in6_equal(peer->address.host, ENET_HOST_BROADCAST) */) || (peer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID && sessionID != peer->incomingSessionID))
  1698. return 0;
  1699. }
  1700. #ifdef ENET_LZ4
  1701. if (flags & ENET_PROTOCOL_HEADER_FLAG_COMPRESSED) {
  1702. size_t originalSize = LZ4_decompress_safe((const char*)host->receivedData + headerSize, (char*)host->packetData[1] + headerSize, host->receivedDataLength - headerSize, sizeof(host->packetData[1]) - headerSize);
  1703. if (originalSize <= 0 || originalSize > sizeof(host->packetData[1]) - headerSize)
  1704. return 0;
  1705. memcpy(host->packetData[1], header, headerSize);
  1706. host->receivedData = host->packetData[1];
  1707. host->receivedDataLength = headerSize + originalSize;
  1708. }
  1709. #endif
  1710. if (host->checksumCallback != NULL) {
  1711. enet_uint32* checksum = (enet_uint32*)&host->receivedData[headerSize - sizeof(enet_uint32)];
  1712. enet_uint32 desiredChecksum = *checksum;
  1713. ENetBuffer buffer;
  1714. *checksum = peer != NULL ? peer->connectID : 0;
  1715. buffer.data = host->receivedData;
  1716. buffer.dataLength = host->receivedDataLength;
  1717. if (host->checksumCallback(&buffer, 1) != desiredChecksum)
  1718. return 0;
  1719. }
  1720. if (peer != NULL) {
  1721. peer->address.host = host->receivedAddress.host;
  1722. peer->address.port = host->receivedAddress.port;
  1723. peer->incomingDataTotal += host->receivedDataLength;
  1724. peer->totalDataReceived += host->receivedDataLength;
  1725. }
  1726. currentData = host->receivedData + headerSize;
  1727. while (currentData < &host->receivedData[host->receivedDataLength]) {
  1728. enet_uint8 commandNumber;
  1729. size_t commandSize;
  1730. command = (ENetProtocol*)currentData;
  1731. if (currentData + sizeof(ENetProtocolCommandHeader) > &host->receivedData[host->receivedDataLength])
  1732. break;
  1733. commandNumber = command->header.command & ENET_PROTOCOL_COMMAND_MASK;
  1734. if (commandNumber >= ENET_PROTOCOL_COMMAND_COUNT)
  1735. break;
  1736. commandSize = commandSizes[commandNumber];
  1737. if (commandSize == 0 || currentData + commandSize > &host->receivedData[host->receivedDataLength])
  1738. break;
  1739. currentData += commandSize;
  1740. if (peer == NULL && (commandNumber != ENET_PROTOCOL_COMMAND_CONNECT || currentData < &host->receivedData[host->receivedDataLength]))
  1741. break;
  1742. command->header.reliableSequenceNumber = ENET_NET_TO_HOST_16(command->header.reliableSequenceNumber);
  1743. switch (commandNumber) {
  1744. case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE:
  1745. if (enet_protocol_handle_acknowledge(host, event, peer, command))
  1746. goto commandError;
  1747. break;
  1748. case ENET_PROTOCOL_COMMAND_CONNECT:
  1749. if (peer != NULL)
  1750. goto commandError;
  1751. if (host->preventConnections == 0) {
  1752. peer = enet_protocol_handle_connect(host, header, command);
  1753. if (peer == NULL)
  1754. goto commandError;
  1755. }
  1756. break;
  1757. case ENET_PROTOCOL_COMMAND_VERIFY_CONNECT:
  1758. if (enet_protocol_handle_verify_connect(host, event, peer, command))
  1759. goto commandError;
  1760. break;
  1761. case ENET_PROTOCOL_COMMAND_DISCONNECT:
  1762. if (enet_protocol_handle_disconnect(host, peer, command))
  1763. goto commandError;
  1764. break;
  1765. case ENET_PROTOCOL_COMMAND_PING:
  1766. if (enet_protocol_handle_ping(host, peer, command))
  1767. goto commandError;
  1768. break;
  1769. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  1770. if (enet_protocol_handle_send_reliable(host, peer, command, &currentData))
  1771. goto commandError;
  1772. break;
  1773. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  1774. if (enet_protocol_handle_send_unreliable(host, peer, command, &currentData))
  1775. goto commandError;
  1776. break;
  1777. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  1778. if (enet_protocol_handle_send_unsequenced(host, peer, command, &currentData))
  1779. goto commandError;
  1780. break;
  1781. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  1782. if (enet_protocol_handle_send_fragment(host, peer, command, &currentData))
  1783. goto commandError;
  1784. break;
  1785. case ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT:
  1786. if (enet_protocol_handle_bandwidth_limit(host, peer, command))
  1787. goto commandError;
  1788. break;
  1789. case ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE:
  1790. if (enet_protocol_handle_throttle_configure(host, peer, command))
  1791. goto commandError;
  1792. break;
  1793. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  1794. if (enet_protocol_handle_send_unreliable_fragment(host, peer, command, &currentData))
  1795. goto commandError;
  1796. break;
  1797. default:
  1798. goto commandError;
  1799. }
  1800. if (peer != NULL && (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0) {
  1801. enet_uint16 sentTime;
  1802. if (!(flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME))
  1803. break;
  1804. sentTime = ENET_NET_TO_HOST_16(header->sentTime);
  1805. switch (peer->state) {
  1806. case ENET_PEER_STATE_DISCONNECTING:
  1807. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1808. case ENET_PEER_STATE_DISCONNECTED:
  1809. case ENET_PEER_STATE_ZOMBIE:
  1810. break;
  1811. case ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT:
  1812. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  1813. enet_peer_queue_acknowledgement(peer, command, sentTime);
  1814. break;
  1815. default:
  1816. enet_peer_queue_acknowledgement(peer, command, sentTime);
  1817. break;
  1818. }
  1819. }
  1820. }
  1821. commandError:
  1822. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  1823. return 1;
  1824. return 0;
  1825. }
  1826. static int enet_protocol_receive_incoming_commands(ENetHost* host, ENetEvent* event) {
  1827. int packets;
  1828. for (packets = 0; packets < 256; ++packets) {
  1829. int receivedLength;
  1830. ENetBuffer buffer;
  1831. buffer.data = host->packetData[0];
  1832. buffer.dataLength = host->mtu;
  1833. receivedLength = enet_socket_receive(host->socket, &host->receivedAddress, &buffer, 1);
  1834. if (receivedLength == -2)
  1835. continue;
  1836. if (receivedLength < 0)
  1837. return -1;
  1838. if (receivedLength == 0)
  1839. return 0;
  1840. host->receivedData = host->packetData[0];
  1841. host->receivedDataLength = receivedLength;
  1842. host->totalReceivedData += receivedLength;
  1843. host->totalReceivedPackets++;
  1844. if (host->interceptCallback != NULL) {
  1845. switch (host->interceptCallback(host, (void*)event)) {
  1846. case 1:
  1847. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  1848. return 1;
  1849. continue;
  1850. case -1:
  1851. return -1;
  1852. default:
  1853. break;
  1854. }
  1855. }
  1856. switch (enet_protocol_handle_incoming_commands(host, event)) {
  1857. case 1:
  1858. return 1;
  1859. case -1:
  1860. return -1;
  1861. default:
  1862. break;
  1863. }
  1864. }
  1865. return -1;
  1866. }
  1867. static void enet_protocol_send_acknowledgements(ENetHost* host, ENetPeer* peer) {
  1868. ENetProtocol* command = &host->commands[host->commandCount];
  1869. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  1870. ENetAcknowledgement* acknowledgement;
  1871. ENetListIterator currentAcknowledgement;
  1872. enet_uint16 reliableSequenceNumber;
  1873. currentAcknowledgement = enet_list_begin(&peer->acknowledgements);
  1874. while (currentAcknowledgement != enet_list_end(&peer->acknowledgements)) {
  1875. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < sizeof(ENetProtocolAcknowledge)) {
  1876. host->continueSending = 1;
  1877. break;
  1878. }
  1879. acknowledgement = (ENetAcknowledgement*)currentAcknowledgement;
  1880. currentAcknowledgement = enet_list_next(currentAcknowledgement);
  1881. buffer->data = command;
  1882. buffer->dataLength = sizeof(ENetProtocolAcknowledge);
  1883. host->packetSize += buffer->dataLength;
  1884. reliableSequenceNumber = ENET_HOST_TO_NET_16(acknowledgement->command.header.reliableSequenceNumber);
  1885. command->header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
  1886. command->header.channelID = acknowledgement->command.header.channelID;
  1887. command->header.reliableSequenceNumber = reliableSequenceNumber;
  1888. command->acknowledge.receivedReliableSequenceNumber = reliableSequenceNumber;
  1889. command->acknowledge.receivedSentTime = ENET_HOST_TO_NET_16(acknowledgement->sentTime);
  1890. if ((acknowledgement->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  1891. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1892. enet_list_remove(&acknowledgement->acknowledgementList);
  1893. enet_free(acknowledgement);
  1894. ++command;
  1895. ++buffer;
  1896. }
  1897. host->commandCount = command - host->commands;
  1898. host->bufferCount = buffer - host->buffers;
  1899. }
  1900. static void enet_protocol_send_unreliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  1901. ENetProtocol* command = &host->commands[host->commandCount];
  1902. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  1903. ENetOutgoingCommand* outgoingCommand;
  1904. ENetListIterator currentCommand;
  1905. currentCommand = enet_list_begin(&peer->outgoingUnreliableCommands);
  1906. while (currentCommand != enet_list_end(&peer->outgoingUnreliableCommands)) {
  1907. size_t commandSize;
  1908. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1909. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  1910. 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)) {
  1911. host->continueSending = 1;
  1912. break;
  1913. }
  1914. currentCommand = enet_list_next(currentCommand);
  1915. if (outgoingCommand->packet != NULL && outgoingCommand->fragmentOffset == 0) {
  1916. peer->packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER;
  1917. peer->packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE;
  1918. if (peer->packetThrottleCounter > peer->packetThrottle) {
  1919. enet_uint16 reliableSequenceNumber = outgoingCommand->reliableSequenceNumber;
  1920. enet_uint16 unreliableSequenceNumber = outgoingCommand->unreliableSequenceNumber;
  1921. for (;;) {
  1922. --outgoingCommand->packet->referenceCount;
  1923. if (outgoingCommand->packet->referenceCount == 0)
  1924. enet_packet_destroy(outgoingCommand->packet);
  1925. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1926. enet_free(outgoingCommand);
  1927. if (currentCommand == enet_list_end(&peer->outgoingUnreliableCommands))
  1928. break;
  1929. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1930. if (outgoingCommand->reliableSequenceNumber != reliableSequenceNumber || outgoingCommand->unreliableSequenceNumber != unreliableSequenceNumber)
  1931. break;
  1932. currentCommand = enet_list_next(currentCommand);
  1933. }
  1934. continue;
  1935. }
  1936. }
  1937. buffer->data = command;
  1938. buffer->dataLength = commandSize;
  1939. host->packetSize += buffer->dataLength;
  1940. *command = outgoingCommand->command;
  1941. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1942. if (outgoingCommand->packet != NULL) {
  1943. ++buffer;
  1944. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  1945. buffer->dataLength = outgoingCommand->fragmentLength;
  1946. host->packetSize += buffer->dataLength;
  1947. enet_list_insert(enet_list_end(&peer->sentUnreliableCommands), outgoingCommand);
  1948. } else {
  1949. enet_free(outgoingCommand);
  1950. }
  1951. ++command;
  1952. ++buffer;
  1953. }
  1954. host->commandCount = command - host->commands;
  1955. host->bufferCount = buffer - host->buffers;
  1956. 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))
  1957. enet_peer_disconnect(peer, peer->eventData);
  1958. }
  1959. static int enet_protocol_check_timeouts(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1960. ENetOutgoingCommand* outgoingCommand;
  1961. ENetListIterator currentCommand, insertPosition;
  1962. currentCommand = enet_list_begin(&peer->sentReliableCommands);
  1963. insertPosition = enet_list_begin(&peer->outgoingReliableCommands);
  1964. while (currentCommand != enet_list_end(&peer->sentReliableCommands)) {
  1965. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1966. currentCommand = enet_list_next(currentCommand);
  1967. if (ENET_TIME_DIFFERENCE(host->serviceTime, outgoingCommand->sentTime) < outgoingCommand->roundTripTimeout)
  1968. continue;
  1969. if (peer->earliestTimeout == 0 || ENET_TIME_LESS(outgoingCommand->sentTime, peer->earliestTimeout))
  1970. peer->earliestTimeout = outgoingCommand->sentTime;
  1971. 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))) {
  1972. enet_protocol_notify_disconnect_timeout(host, peer, event);
  1973. return 1;
  1974. }
  1975. if (outgoingCommand->packet != NULL)
  1976. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  1977. ++peer->packetsLost;
  1978. ++peer->totalPacketsLost;
  1979. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  1980. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  1981. enet_list_insert(insertPosition, enet_list_remove(&outgoingCommand->outgoingCommandList));
  1982. if (currentCommand == enet_list_begin(&peer->sentReliableCommands) && !enet_list_empty(&peer->sentReliableCommands)) {
  1983. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1984. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  1985. }
  1986. }
  1987. return 0;
  1988. }
  1989. static int enet_protocol_send_reliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  1990. ENetProtocol* command = &host->commands[host->commandCount];
  1991. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  1992. ENetOutgoingCommand* outgoingCommand;
  1993. ENetListIterator currentCommand;
  1994. ENetChannel* channel;
  1995. enet_uint16 reliableWindow;
  1996. size_t commandSize;
  1997. int windowExceeded = 0, windowWrap = 0, canPing = 1;
  1998. currentCommand = enet_list_begin(&peer->outgoingReliableCommands);
  1999. while (currentCommand != enet_list_end(&peer->outgoingReliableCommands)) {
  2000. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2001. channel = outgoingCommand->command.header.channelID < peer->channelCount ? &peer->channels[outgoingCommand->command.header.channelID] : NULL;
  2002. reliableWindow = outgoingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2003. if (channel != NULL) {
  2004. 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)))))
  2005. windowWrap = 1;
  2006. if (windowWrap) {
  2007. currentCommand = enet_list_next(currentCommand);
  2008. continue;
  2009. }
  2010. }
  2011. if (outgoingCommand->packet != NULL) {
  2012. if (!windowExceeded) {
  2013. enet_uint32 windowSize = (peer->packetThrottle * peer->windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE;
  2014. if (peer->reliableDataInTransit + outgoingCommand->fragmentLength > ENET_MAX(windowSize, peer->mtu))
  2015. windowExceeded = 1;
  2016. }
  2017. if (windowExceeded) {
  2018. currentCommand = enet_list_next(currentCommand);
  2019. continue;
  2020. }
  2021. }
  2022. canPing = 0;
  2023. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2024. 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))) {
  2025. host->continueSending = 1;
  2026. break;
  2027. }
  2028. currentCommand = enet_list_next(currentCommand);
  2029. if (channel != NULL && outgoingCommand->sendAttempts < 1) {
  2030. channel->usedReliableWindows |= 1 << reliableWindow;
  2031. ++channel->reliableWindows[reliableWindow];
  2032. }
  2033. ++outgoingCommand->sendAttempts;
  2034. if (outgoingCommand->roundTripTimeout == 0) {
  2035. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2036. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2037. }
  2038. if (enet_list_empty(&peer->sentReliableCommands))
  2039. peer->nextTimeout = host->serviceTime + outgoingCommand->roundTripTimeout;
  2040. enet_list_insert(enet_list_end(&peer->sentReliableCommands), enet_list_remove(&outgoingCommand->outgoingCommandList));
  2041. outgoingCommand->sentTime = host->serviceTime;
  2042. buffer->data = command;
  2043. buffer->dataLength = commandSize;
  2044. host->packetSize += buffer->dataLength;
  2045. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_SENT_TIME;
  2046. *command = outgoingCommand->command;
  2047. if (outgoingCommand->packet != NULL) {
  2048. ++buffer;
  2049. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2050. buffer->dataLength = outgoingCommand->fragmentLength;
  2051. host->packetSize += outgoingCommand->fragmentLength;
  2052. peer->reliableDataInTransit += outgoingCommand->fragmentLength;
  2053. }
  2054. ++peer->packetsSent;
  2055. ++peer->totalPacketsSent;
  2056. ++command;
  2057. ++buffer;
  2058. }
  2059. host->commandCount = command - host->commands;
  2060. host->bufferCount = buffer - host->buffers;
  2061. return canPing;
  2062. }
  2063. static int enet_protocol_send_outgoing_commands(ENetHost* host, ENetEvent* event, int checkForTimeouts) {
  2064. enet_uint8 headerData[sizeof(ENetProtocolHeader) + sizeof(enet_uint32)];
  2065. ENetProtocolHeader* header = (ENetProtocolHeader*)headerData;
  2066. ENetPeer* currentPeer;
  2067. int sentLength;
  2068. host->continueSending = 1;
  2069. #ifdef ENET_LZ4
  2070. size_t shouldCompress = 0;
  2071. #endif
  2072. while (host->continueSending)
  2073. for (host->continueSending = 0, currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2074. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED || currentPeer->state == ENET_PEER_STATE_ZOMBIE)
  2075. continue;
  2076. host->headerFlags = 0;
  2077. host->commandCount = 0;
  2078. host->bufferCount = 1;
  2079. host->packetSize = sizeof(ENetProtocolHeader);
  2080. if (!enet_list_empty(&currentPeer->acknowledgements))
  2081. enet_protocol_send_acknowledgements(host, currentPeer);
  2082. if (checkForTimeouts != 0 && !enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_GREATER_EQUAL(host->serviceTime, currentPeer->nextTimeout) && enet_protocol_check_timeouts(host, currentPeer, event) == 1) {
  2083. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2084. return 1;
  2085. else
  2086. continue;
  2087. }
  2088. 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)) {
  2089. enet_peer_ping(currentPeer);
  2090. enet_protocol_send_reliable_outgoing_commands(host, currentPeer);
  2091. }
  2092. if (!enet_list_empty(&currentPeer->outgoingUnreliableCommands))
  2093. enet_protocol_send_unreliable_outgoing_commands(host, currentPeer);
  2094. if (host->commandCount == 0)
  2095. continue;
  2096. if (currentPeer->packetLossEpoch == 0) {
  2097. currentPeer->packetLossEpoch = host->serviceTime;
  2098. } else if (ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->packetLossEpoch) >= ENET_PEER_PACKET_LOSS_INTERVAL && currentPeer->packetsSent > 0) {
  2099. enet_uint32 packetLoss = currentPeer->packetsLost * ENET_PEER_PACKET_LOSS_SCALE / currentPeer->packetsSent;
  2100. #ifdef ENET_DEBUG
  2101. printf(
  2102. "peer %u: %f%%+-%f%% packet loss, %u+-%u ms round trip time, %f%% throttle, %u/%u outgoing, %u/%u incoming\n", currentPeer->incomingPeerID,
  2103. currentPeer->packetLoss / (float)ENET_PEER_PACKET_LOSS_SCALE,
  2104. currentPeer->packetLossVariance / (float)ENET_PEER_PACKET_LOSS_SCALE, currentPeer->roundTripTime, currentPeer->roundTripTimeVariance,
  2105. currentPeer->packetThrottle / (float)ENET_PEER_PACKET_THROTTLE_SCALE,
  2106. enet_list_size(&currentPeer->outgoingReliableCommands),
  2107. enet_list_size(&currentPeer->outgoingUnreliableCommands),
  2108. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingReliableCommands) : 0,
  2109. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingUnreliableCommands) : 0
  2110. );
  2111. #endif
  2112. currentPeer->packetLossVariance -= currentPeer->packetLossVariance / 4;
  2113. if (packetLoss >= currentPeer->packetLoss) {
  2114. currentPeer->packetLoss += (packetLoss - currentPeer->packetLoss) / 8;
  2115. currentPeer->packetLossVariance += (packetLoss - currentPeer->packetLoss) / 4;
  2116. } else {
  2117. currentPeer->packetLoss -= (currentPeer->packetLoss - packetLoss) / 8;
  2118. currentPeer->packetLossVariance += (currentPeer->packetLoss - packetLoss) / 4;
  2119. }
  2120. currentPeer->packetLossEpoch = host->serviceTime;
  2121. currentPeer->packetsSent = 0;
  2122. currentPeer->packetsLost = 0;
  2123. }
  2124. host->buffers->data = headerData;
  2125. if (host->headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME) {
  2126. header->sentTime = ENET_HOST_TO_NET_16(host->serviceTime & 0xFFFF);
  2127. host->buffers->dataLength = sizeof(ENetProtocolHeader);
  2128. } else {
  2129. host->buffers->dataLength = (size_t)&((ENetProtocolHeader*)0)->sentTime;
  2130. }
  2131. #ifdef ENET_LZ4
  2132. if (host->compression == 1 && host->packetSize > 64) {
  2133. size_t originalSize = host->packetSize - sizeof(ENetProtocolHeader), compressedSize = 0;
  2134. const ENetBuffer* buffers = &host->buffers[1];
  2135. char* data = (char*)enet_malloc(originalSize);
  2136. int totalSize = originalSize, dataSize = 0;
  2137. while (totalSize) {
  2138. for (int i = 0; i < host->bufferCount - 1; i++) {
  2139. int copySize = ENET_MIN(totalSize, (int)buffers[i].dataLength);
  2140. memcpy(data + dataSize, buffers[i].data, copySize);
  2141. totalSize -= copySize;
  2142. dataSize += copySize;
  2143. }
  2144. }
  2145. compressedSize = LZ4_compress_default((const char*)data, (char*)host->packetData[1], dataSize, originalSize);
  2146. enet_free(data);
  2147. if (compressedSize > 0 && compressedSize < originalSize) {
  2148. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_COMPRESSED;
  2149. shouldCompress = compressedSize;
  2150. #ifdef ENET_DEBUG_COMPRESS
  2151. printf("peer %u: compressed %u->%u (%u%%)\n", currentPeer->incomingPeerID, originalSize, compressedSize, (compressedSize * 100) / originalSize);
  2152. #endif
  2153. }
  2154. }
  2155. #endif
  2156. if (currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2157. host->headerFlags |= currentPeer->outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  2158. header->peerID = ENET_HOST_TO_NET_16(currentPeer->outgoingPeerID | host->headerFlags);
  2159. if (host->checksumCallback != NULL) {
  2160. enet_uint32* checksum = (enet_uint32*)&headerData[host->buffers->dataLength];
  2161. *checksum = currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer->connectID : 0;
  2162. host->buffers->dataLength += sizeof(enet_uint32);
  2163. *checksum = host->checksumCallback(host->buffers, host->bufferCount);
  2164. }
  2165. #ifdef ENET_LZ4
  2166. if (shouldCompress > 0) {
  2167. host->buffers[1].data = host->packetData[1];
  2168. host->buffers[1].dataLength = shouldCompress;
  2169. host->bufferCount = 2;
  2170. }
  2171. #endif
  2172. currentPeer->lastSendTime = host->serviceTime;
  2173. sentLength = enet_socket_send(host->socket, &currentPeer->address, host->buffers, host->bufferCount);
  2174. enet_protocol_remove_sent_unreliable_commands(currentPeer);
  2175. if (sentLength < 0)
  2176. return -1;
  2177. host->totalSentData += sentLength;
  2178. currentPeer->totalDataSent += sentLength;
  2179. host->totalSentPackets++;
  2180. }
  2181. return 0;
  2182. }
  2183. void enet_host_flush(ENetHost* host) {
  2184. host->serviceTime = enet_time_get();
  2185. enet_protocol_send_outgoing_commands(host, NULL, 0);
  2186. }
  2187. int enet_host_check_events(ENetHost* host, ENetEvent* event) {
  2188. if (event == NULL)
  2189. return -1;
  2190. event->type = ENET_EVENT_TYPE_NONE;
  2191. event->peer = NULL;
  2192. event->packet = NULL;
  2193. return enet_protocol_dispatch_incoming_commands(host, event);
  2194. }
  2195. int enet_host_service(ENetHost* host, ENetEvent* event, enet_uint32 timeout) {
  2196. enet_uint32 waitCondition;
  2197. if (event != NULL) {
  2198. event->type = ENET_EVENT_TYPE_NONE;
  2199. event->peer = NULL;
  2200. event->packet = NULL;
  2201. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2202. case 1:
  2203. return 1;
  2204. case -1:
  2205. #ifdef ENET_DEBUG
  2206. perror("Error dispatching incoming packets");
  2207. #endif
  2208. return -1;
  2209. default:
  2210. break;
  2211. }
  2212. }
  2213. host->serviceTime = enet_time_get();
  2214. timeout += host->serviceTime;
  2215. do {
  2216. if (ENET_TIME_DIFFERENCE(host->serviceTime, host->bandwidthThrottleEpoch) >= ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  2217. enet_host_bandwidth_throttle(host);
  2218. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2219. case 1:
  2220. return 1;
  2221. case -1:
  2222. #ifdef ENET_DEBUG
  2223. perror("Error sending outgoing packets");
  2224. #endif
  2225. return -1;
  2226. default:
  2227. break;
  2228. }
  2229. switch (enet_protocol_receive_incoming_commands(host, event)) {
  2230. case 1:
  2231. return 1;
  2232. case -1:
  2233. #ifdef ENET_DEBUG
  2234. perror("Error receiving incoming packets");
  2235. #endif
  2236. return -1;
  2237. default:
  2238. break;
  2239. }
  2240. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2241. case 1:
  2242. return 1;
  2243. case -1:
  2244. #ifdef ENET_DEBUG
  2245. perror("Error sending outgoing packets");
  2246. #endif
  2247. return -1;
  2248. default:
  2249. break;
  2250. }
  2251. if (event != NULL) {
  2252. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2253. case 1:
  2254. return 1;
  2255. case -1:
  2256. #ifdef ENET_DEBUG
  2257. perror("Error dispatching incoming packets");
  2258. #endif
  2259. return -1;
  2260. default:
  2261. break;
  2262. }
  2263. }
  2264. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2265. return 0;
  2266. do {
  2267. host->serviceTime = enet_time_get();
  2268. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2269. return 0;
  2270. waitCondition = ENET_SOCKET_WAIT_RECEIVE | ENET_SOCKET_WAIT_INTERRUPT;
  2271. if (enet_socket_wait(host->socket, &waitCondition, ENET_TIME_DIFFERENCE(timeout, host->serviceTime)) != 0)
  2272. return -1;
  2273. }
  2274. while (waitCondition & ENET_SOCKET_WAIT_INTERRUPT);
  2275. host->serviceTime = enet_time_get();
  2276. }
  2277. while (waitCondition & ENET_SOCKET_WAIT_RECEIVE);
  2278. return 0;
  2279. }
  2280. // =======================================================================//
  2281. // !
  2282. // ! Peer
  2283. // !
  2284. // =======================================================================//
  2285. void enet_peer_throttle_configure(ENetPeer* peer, enet_uint32 interval, enet_uint32 acceleration, enet_uint32 deceleration) {
  2286. ENetProtocol command;
  2287. peer->packetThrottleInterval = interval;
  2288. peer->packetThrottleAcceleration = acceleration;
  2289. peer->packetThrottleDeceleration = deceleration;
  2290. command.header.command = ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2291. command.header.channelID = 0xFF;
  2292. command.throttleConfigure.packetThrottleInterval = ENET_HOST_TO_NET_32(interval);
  2293. command.throttleConfigure.packetThrottleAcceleration = ENET_HOST_TO_NET_32(acceleration);
  2294. command.throttleConfigure.packetThrottleDeceleration = ENET_HOST_TO_NET_32(deceleration);
  2295. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2296. }
  2297. int enet_peer_throttle(ENetPeer* peer, enet_uint32 rtt) {
  2298. if (peer->lastRoundTripTime <= peer->lastRoundTripTimeVariance) {
  2299. peer->packetThrottle = peer->packetThrottleLimit;
  2300. } else if (rtt < peer->lastRoundTripTime) {
  2301. peer->packetThrottle += peer->packetThrottleAcceleration;
  2302. if (peer->packetThrottle > peer->packetThrottleLimit)
  2303. peer->packetThrottle = peer->packetThrottleLimit;
  2304. return 1;
  2305. } else if (rtt > peer->lastRoundTripTime + 2 * peer->lastRoundTripTimeVariance) {
  2306. if (peer->packetThrottle > peer->packetThrottleDeceleration)
  2307. peer->packetThrottle -= peer->packetThrottleDeceleration;
  2308. else
  2309. peer->packetThrottle = 0;
  2310. return -1;
  2311. }
  2312. return 0;
  2313. }
  2314. int enet_peer_send(ENetPeer* peer, enet_uint8 channelID, ENetPacket* packet) {
  2315. ENetChannel* channel = &peer->channels[channelID];
  2316. ENetProtocol command;
  2317. size_t fragmentLength;
  2318. if (peer->state != ENET_PEER_STATE_CONNECTED || channelID >= peer->channelCount || packet->dataLength > peer->host->maximumPacketSize)
  2319. return -1;
  2320. fragmentLength = peer->mtu - sizeof(ENetProtocolHeader) - sizeof(ENetProtocolSendFragment);
  2321. if (peer->host->checksumCallback != NULL)
  2322. fragmentLength -= sizeof(enet_uint32);
  2323. if (packet->dataLength > fragmentLength) {
  2324. enet_uint32 fragmentCount = (packet->dataLength + fragmentLength - 1) / fragmentLength, fragmentNumber, fragmentOffset;
  2325. enet_uint8 commandNumber;
  2326. enet_uint16 startSequenceNumber;
  2327. ENetList fragments;
  2328. ENetOutgoingCommand* fragment;
  2329. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2330. return -1;
  2331. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT)) == ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT && channel->outgoingUnreliableSequenceNumber < 0xFFFF) {
  2332. commandNumber = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT;
  2333. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingUnreliableSequenceNumber + 1);
  2334. } else {
  2335. commandNumber = ENET_PROTOCOL_COMMAND_SEND_FRAGMENT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2336. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingReliableSequenceNumber + 1);
  2337. }
  2338. enet_list_clear(&fragments);
  2339. for (fragmentNumber = 0, fragmentOffset = 0; fragmentOffset < packet->dataLength; ++fragmentNumber, fragmentOffset += fragmentLength) {
  2340. if (packet->dataLength - fragmentOffset < fragmentLength)
  2341. fragmentLength = packet->dataLength - fragmentOffset;
  2342. fragment = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2343. if (fragment == NULL) {
  2344. while (!enet_list_empty(&fragments)) {
  2345. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2346. enet_free(fragment);
  2347. }
  2348. return -1;
  2349. }
  2350. fragment->fragmentOffset = fragmentOffset;
  2351. fragment->fragmentLength = fragmentLength;
  2352. fragment->packet = packet;
  2353. fragment->command.header.command = commandNumber;
  2354. fragment->command.header.channelID = channelID;
  2355. fragment->command.sendFragment.startSequenceNumber = startSequenceNumber;
  2356. fragment->command.sendFragment.dataLength = ENET_HOST_TO_NET_16(fragmentLength);
  2357. fragment->command.sendFragment.fragmentCount = ENET_HOST_TO_NET_32(fragmentCount);
  2358. fragment->command.sendFragment.fragmentNumber = ENET_HOST_TO_NET_32(fragmentNumber);
  2359. fragment->command.sendFragment.totalLength = ENET_HOST_TO_NET_32(packet->dataLength);
  2360. fragment->command.sendFragment.fragmentOffset = ENET_NET_TO_HOST_32(fragmentOffset);
  2361. enet_list_insert(enet_list_end(&fragments), fragment);
  2362. }
  2363. packet->referenceCount += fragmentNumber;
  2364. while (!enet_list_empty(&fragments)) {
  2365. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2366. enet_peer_setup_outgoing_command(peer, fragment);
  2367. }
  2368. return 0;
  2369. }
  2370. command.header.channelID = channelID;
  2371. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNSEQUENCED)) == ENET_PACKET_FLAG_UNSEQUENCED) {
  2372. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2373. command.sendUnsequenced.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2374. } else if (packet->flags & ENET_PACKET_FLAG_RELIABLE || channel->outgoingUnreliableSequenceNumber >= 0xFFFF) {
  2375. command.header.command = ENET_PROTOCOL_COMMAND_SEND_RELIABLE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2376. command.sendReliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2377. } else {
  2378. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE;
  2379. command.sendUnreliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2380. }
  2381. if (enet_peer_queue_outgoing_command(peer, &command, packet, 0, packet->dataLength) == NULL)
  2382. return -1;
  2383. return 0;
  2384. }
  2385. ENetPacket* enet_peer_receive(ENetPeer* peer, enet_uint8* channelID) {
  2386. ENetIncomingCommand* incomingCommand;
  2387. ENetPacket* packet;
  2388. if (enet_list_empty(&peer->dispatchedCommands))
  2389. return NULL;
  2390. incomingCommand = (ENetIncomingCommand*)enet_list_remove(enet_list_begin(&peer->dispatchedCommands));
  2391. if (channelID != NULL)
  2392. *channelID = incomingCommand->command.header.channelID;
  2393. packet = incomingCommand->packet;
  2394. --packet->referenceCount;
  2395. if (incomingCommand->fragments != NULL)
  2396. enet_free(incomingCommand->fragments);
  2397. enet_free(incomingCommand);
  2398. peer->totalWaitingData -= packet->dataLength;
  2399. return packet;
  2400. }
  2401. static void enet_peer_reset_outgoing_commands(ENetList* queue) {
  2402. ENetOutgoingCommand* outgoingCommand;
  2403. while (!enet_list_empty(queue)) {
  2404. outgoingCommand = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(queue));
  2405. if (outgoingCommand->packet != NULL) {
  2406. --outgoingCommand->packet->referenceCount;
  2407. if (outgoingCommand->packet->referenceCount == 0)
  2408. enet_packet_destroy(outgoingCommand->packet);
  2409. }
  2410. enet_free(outgoingCommand);
  2411. }
  2412. }
  2413. static void enet_peer_remove_incoming_commands(ENetList* queue, ENetListIterator startCommand, ENetListIterator endCommand) {
  2414. ENetListIterator currentCommand;
  2415. for (currentCommand = startCommand; currentCommand != endCommand;) {
  2416. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2417. currentCommand = enet_list_next(currentCommand);
  2418. enet_list_remove(&incomingCommand->incomingCommandList);
  2419. if (incomingCommand->packet != NULL) {
  2420. --incomingCommand->packet->referenceCount;
  2421. if (incomingCommand->packet->referenceCount == 0)
  2422. enet_packet_destroy(incomingCommand->packet);
  2423. }
  2424. if (incomingCommand->fragments != NULL)
  2425. enet_free(incomingCommand->fragments);
  2426. enet_free(incomingCommand);
  2427. }
  2428. }
  2429. static void enet_peer_reset_incoming_commands(ENetList* queue) {
  2430. enet_peer_remove_incoming_commands(queue, enet_list_begin(queue), enet_list_end(queue));
  2431. }
  2432. void enet_peer_reset_queues(ENetPeer* peer) {
  2433. ENetChannel* channel;
  2434. if (peer->needsDispatch) {
  2435. enet_list_remove(&peer->dispatchList);
  2436. peer->needsDispatch = 0;
  2437. }
  2438. while (!enet_list_empty(&peer->acknowledgements)) {
  2439. enet_free(enet_list_remove(enet_list_begin(&peer->acknowledgements)));
  2440. }
  2441. enet_peer_reset_outgoing_commands(&peer->sentReliableCommands);
  2442. enet_peer_reset_outgoing_commands(&peer->sentUnreliableCommands);
  2443. enet_peer_reset_outgoing_commands(&peer->outgoingReliableCommands);
  2444. enet_peer_reset_outgoing_commands(&peer->outgoingUnreliableCommands);
  2445. enet_peer_reset_incoming_commands(&peer->dispatchedCommands);
  2446. if (peer->channels != NULL && peer->channelCount > 0) {
  2447. for (channel = peer->channels; channel < &peer->channels[peer->channelCount]; ++channel) {
  2448. enet_peer_reset_incoming_commands(&channel->incomingReliableCommands);
  2449. enet_peer_reset_incoming_commands(&channel->incomingUnreliableCommands);
  2450. }
  2451. enet_free(peer->channels);
  2452. }
  2453. peer->channels = NULL;
  2454. peer->channelCount = 0;
  2455. }
  2456. void enet_peer_on_connect(ENetPeer* peer) {
  2457. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  2458. if (peer->incomingBandwidth != 0)
  2459. ++peer->host->bandwidthLimitedPeers;
  2460. ++peer->host->connectedPeers;
  2461. }
  2462. }
  2463. void enet_peer_on_disconnect(ENetPeer* peer) {
  2464. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2465. if (peer->incomingBandwidth != 0)
  2466. --peer->host->bandwidthLimitedPeers;
  2467. --peer->host->connectedPeers;
  2468. }
  2469. }
  2470. void enet_peer_reset(ENetPeer* peer) {
  2471. enet_peer_on_disconnect(peer);
  2472. peer->outgoingPeerID = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  2473. peer->state = ENET_PEER_STATE_DISCONNECTED;
  2474. peer->incomingBandwidth = 0;
  2475. peer->outgoingBandwidth = 0;
  2476. peer->incomingBandwidthThrottleEpoch = 0;
  2477. peer->outgoingBandwidthThrottleEpoch = 0;
  2478. peer->incomingDataTotal = 0;
  2479. peer->totalDataReceived = 0;
  2480. peer->outgoingDataTotal = 0;
  2481. peer->totalDataSent = 0;
  2482. peer->lastSendTime = 0;
  2483. peer->lastReceiveTime = 0;
  2484. peer->nextTimeout = 0;
  2485. peer->earliestTimeout = 0;
  2486. peer->packetLossEpoch = 0;
  2487. peer->packetsSent = 0;
  2488. peer->totalPacketsSent = 0;
  2489. peer->packetsLost = 0;
  2490. peer->totalPacketsLost = 0;
  2491. peer->packetLoss = 0;
  2492. peer->packetLossVariance = 0;
  2493. peer->packetThrottle = ENET_PEER_DEFAULT_PACKET_THROTTLE;
  2494. peer->packetThrottleLimit = ENET_PEER_PACKET_THROTTLE_SCALE;
  2495. peer->packetThrottleCounter = 0;
  2496. peer->packetThrottleEpoch = 0;
  2497. peer->packetThrottleAcceleration = ENET_PEER_PACKET_THROTTLE_ACCELERATION;
  2498. peer->packetThrottleDeceleration = ENET_PEER_PACKET_THROTTLE_DECELERATION;
  2499. peer->packetThrottleInterval = ENET_PEER_PACKET_THROTTLE_INTERVAL;
  2500. peer->pingInterval = ENET_PEER_PING_INTERVAL;
  2501. peer->timeoutLimit = ENET_PEER_TIMEOUT_LIMIT;
  2502. peer->timeoutMinimum = ENET_PEER_TIMEOUT_MINIMUM;
  2503. peer->timeoutMaximum = ENET_PEER_TIMEOUT_MAXIMUM;
  2504. peer->smoothedRoundTripTime = 0;
  2505. peer->lastRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2506. peer->lowestRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2507. peer->lastRoundTripTimeVariance = 0;
  2508. peer->highestRoundTripTimeVariance = 0;
  2509. peer->roundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2510. peer->roundTripTimeVariance = 0;
  2511. peer->mtu = peer->host->mtu;
  2512. peer->reliableDataInTransit = 0;
  2513. peer->outgoingReliableSequenceNumber = 0;
  2514. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  2515. peer->incomingUnsequencedGroup = 0;
  2516. peer->outgoingUnsequencedGroup = 0;
  2517. peer->eventData = 0;
  2518. peer->totalWaitingData = 0;
  2519. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  2520. enet_peer_reset_queues(peer);
  2521. }
  2522. void enet_peer_ping(ENetPeer* peer) {
  2523. ENetProtocol command;
  2524. if (peer->state != ENET_PEER_STATE_CONNECTED)
  2525. return;
  2526. command.header.command = ENET_PROTOCOL_COMMAND_PING | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2527. command.header.channelID = 0xFF;
  2528. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2529. }
  2530. void enet_peer_ping_interval(ENetPeer* peer, enet_uint32 pingInterval) {
  2531. peer->pingInterval = pingInterval ? pingInterval : ENET_PEER_PING_INTERVAL;
  2532. }
  2533. void enet_peer_timeout(ENetPeer* peer, enet_uint32 timeoutLimit, enet_uint32 timeoutMinimum, enet_uint32 timeoutMaximum) {
  2534. peer->timeoutLimit = timeoutLimit ? timeoutLimit : ENET_PEER_TIMEOUT_LIMIT;
  2535. peer->timeoutMinimum = timeoutMinimum ? timeoutMinimum : ENET_PEER_TIMEOUT_MINIMUM;
  2536. peer->timeoutMaximum = timeoutMaximum ? timeoutMaximum : ENET_PEER_TIMEOUT_MAXIMUM;
  2537. }
  2538. void enet_peer_disconnect_now(ENetPeer* peer, enet_uint32 data) {
  2539. ENetProtocol command;
  2540. if (peer->state == ENET_PEER_STATE_DISCONNECTED)
  2541. return;
  2542. if (peer->state != ENET_PEER_STATE_ZOMBIE && peer->state != ENET_PEER_STATE_DISCONNECTING) {
  2543. enet_peer_reset_queues(peer);
  2544. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2545. command.header.channelID = 0xFF;
  2546. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2547. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2548. enet_host_flush(peer->host);
  2549. }
  2550. enet_peer_reset(peer);
  2551. }
  2552. void enet_peer_disconnect(ENetPeer* peer, enet_uint32 data) {
  2553. ENetProtocol command;
  2554. 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)
  2555. return;
  2556. enet_peer_reset_queues(peer);
  2557. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT;
  2558. command.header.channelID = 0xFF;
  2559. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2560. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2561. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2562. else
  2563. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2564. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2565. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2566. enet_peer_on_disconnect(peer);
  2567. peer->state = ENET_PEER_STATE_DISCONNECTING;
  2568. } else {
  2569. enet_host_flush(peer->host);
  2570. enet_peer_reset(peer);
  2571. }
  2572. }
  2573. void enet_peer_disconnect_later(ENetPeer* peer, enet_uint32 data) {
  2574. 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))) {
  2575. peer->state = ENET_PEER_STATE_DISCONNECT_LATER;
  2576. peer->eventData = data;
  2577. } else {
  2578. enet_peer_disconnect(peer, data);
  2579. }
  2580. }
  2581. ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer* peer, const ENetProtocol* command, enet_uint16 sentTime) {
  2582. ENetAcknowledgement* acknowledgement;
  2583. if (command->header.channelID < peer->channelCount) {
  2584. ENetChannel* channel = &peer->channels[command->header.channelID];
  2585. enet_uint16 reliableWindow = command->header.reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2586. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2587. if (command->header.reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2588. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2589. if (reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1 && reliableWindow <= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS)
  2590. return NULL;
  2591. }
  2592. acknowledgement = (ENetAcknowledgement*)enet_malloc(sizeof(ENetAcknowledgement));
  2593. if (acknowledgement == NULL)
  2594. return NULL;
  2595. peer->outgoingDataTotal += sizeof(ENetProtocolAcknowledge);
  2596. acknowledgement->sentTime = sentTime;
  2597. acknowledgement->command = *command;
  2598. enet_list_insert(enet_list_end(&peer->acknowledgements), acknowledgement);
  2599. return acknowledgement;
  2600. }
  2601. void enet_peer_setup_outgoing_command(ENetPeer* peer, ENetOutgoingCommand* outgoingCommand) {
  2602. ENetChannel* channel = &peer->channels[outgoingCommand->command.header.channelID];
  2603. peer->outgoingDataTotal += enet_protocol_command_size(outgoingCommand->command.header.command) + outgoingCommand->fragmentLength;
  2604. if (outgoingCommand->command.header.channelID == 0xFF) {
  2605. ++peer->outgoingReliableSequenceNumber;
  2606. outgoingCommand->reliableSequenceNumber = peer->outgoingReliableSequenceNumber;
  2607. outgoingCommand->unreliableSequenceNumber = 0;
  2608. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2609. ++channel->outgoingReliableSequenceNumber;
  2610. channel->outgoingUnreliableSequenceNumber = 0;
  2611. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2612. outgoingCommand->unreliableSequenceNumber = 0;
  2613. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED) {
  2614. ++peer->outgoingUnsequencedGroup;
  2615. outgoingCommand->reliableSequenceNumber = 0;
  2616. outgoingCommand->unreliableSequenceNumber = 0;
  2617. } else {
  2618. if (outgoingCommand->fragmentOffset == 0)
  2619. ++channel->outgoingUnreliableSequenceNumber;
  2620. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2621. outgoingCommand->unreliableSequenceNumber = channel->outgoingUnreliableSequenceNumber;
  2622. }
  2623. outgoingCommand->sendAttempts = 0;
  2624. outgoingCommand->sentTime = 0;
  2625. outgoingCommand->roundTripTimeout = 0;
  2626. outgoingCommand->roundTripTimeoutLimit = 0;
  2627. outgoingCommand->command.header.reliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->reliableSequenceNumber);
  2628. switch (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2629. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2630. outgoingCommand->command.sendUnreliable.unreliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->unreliableSequenceNumber);
  2631. break;
  2632. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2633. outgoingCommand->command.sendUnsequenced.unsequencedGroup = ENET_HOST_TO_NET_16(peer->outgoingUnsequencedGroup);
  2634. break;
  2635. default:
  2636. break;
  2637. }
  2638. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)
  2639. enet_list_insert(enet_list_end(&peer->outgoingReliableCommands), outgoingCommand);
  2640. else
  2641. enet_list_insert(enet_list_end(&peer->outgoingUnreliableCommands), outgoingCommand);
  2642. }
  2643. ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer* peer, const ENetProtocol* command, ENetPacket* packet, enet_uint32 offset, enet_uint16 length) {
  2644. ENetOutgoingCommand* outgoingCommand = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2645. if (outgoingCommand == NULL)
  2646. return NULL;
  2647. outgoingCommand->command = *command;
  2648. outgoingCommand->fragmentOffset = offset;
  2649. outgoingCommand->fragmentLength = length;
  2650. outgoingCommand->packet = packet;
  2651. if (packet != NULL)
  2652. ++packet->referenceCount;
  2653. enet_peer_setup_outgoing_command(peer, outgoingCommand);
  2654. return outgoingCommand;
  2655. }
  2656. void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2657. ENetListIterator droppedCommand, startCommand, currentCommand;
  2658. for (droppedCommand = startCommand = currentCommand = enet_list_begin(&channel->incomingUnreliableCommands); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2659. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2660. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2661. continue;
  2662. if (incomingCommand->reliableSequenceNumber == channel->incomingReliableSequenceNumber) {
  2663. if (incomingCommand->fragmentsRemaining <= 0) {
  2664. channel->incomingUnreliableSequenceNumber = incomingCommand->unreliableSequenceNumber;
  2665. continue;
  2666. }
  2667. if (startCommand != currentCommand) {
  2668. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2669. if (!peer->needsDispatch) {
  2670. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2671. peer->needsDispatch = 1;
  2672. }
  2673. droppedCommand = currentCommand;
  2674. } else if (droppedCommand != currentCommand)
  2675. droppedCommand = enet_list_previous(currentCommand);
  2676. } else {
  2677. enet_uint16 reliableWindow = incomingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2678. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2679. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2680. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2681. if (reliableWindow >= currentWindow && reliableWindow < currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2682. break;
  2683. droppedCommand = enet_list_next(currentCommand);
  2684. if (startCommand != currentCommand) {
  2685. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2686. if (!peer->needsDispatch) {
  2687. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2688. peer->needsDispatch = 1;
  2689. }
  2690. }
  2691. }
  2692. startCommand = enet_list_next(currentCommand);
  2693. }
  2694. if (startCommand != currentCommand) {
  2695. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2696. if (!peer->needsDispatch) {
  2697. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2698. peer->needsDispatch = 1;
  2699. }
  2700. droppedCommand = currentCommand;
  2701. }
  2702. enet_peer_remove_incoming_commands(&channel->incomingUnreliableCommands, enet_list_begin(&channel->incomingUnreliableCommands), droppedCommand);
  2703. }
  2704. void enet_peer_dispatch_incoming_reliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2705. ENetListIterator currentCommand;
  2706. for (currentCommand = enet_list_begin(&channel->incomingReliableCommands); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2707. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2708. if (incomingCommand->fragmentsRemaining > 0 || incomingCommand->reliableSequenceNumber != (enet_uint16)(channel->incomingReliableSequenceNumber + 1))
  2709. break;
  2710. channel->incomingReliableSequenceNumber = incomingCommand->reliableSequenceNumber;
  2711. if (incomingCommand->fragmentCount > 0)
  2712. channel->incomingReliableSequenceNumber += incomingCommand->fragmentCount - 1;
  2713. }
  2714. if (currentCommand == enet_list_begin(&channel->incomingReliableCommands))
  2715. return;
  2716. channel->incomingUnreliableSequenceNumber = 0;
  2717. enet_list_move(enet_list_end(&peer->dispatchedCommands), enet_list_begin(&channel->incomingReliableCommands), enet_list_previous(currentCommand));
  2718. if (!peer->needsDispatch) {
  2719. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2720. peer->needsDispatch = 1;
  2721. }
  2722. if (!enet_list_empty(&channel->incomingUnreliableCommands))
  2723. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2724. }
  2725. ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer* peer, const ENetProtocol* command, const void* data, size_t dataLength, enet_uint32 flags, enet_uint32 fragmentCount) {
  2726. static ENetIncomingCommand dummyCommand;
  2727. ENetChannel* channel = &peer->channels[command->header.channelID];
  2728. enet_uint32 unreliableSequenceNumber = 0, reliableSequenceNumber = 0;
  2729. enet_uint16 reliableWindow, currentWindow;
  2730. ENetIncomingCommand* incomingCommand;
  2731. ENetListIterator currentCommand;
  2732. ENetPacket* packet = NULL;
  2733. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2734. goto discardCommand;
  2735. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) {
  2736. reliableSequenceNumber = command->header.reliableSequenceNumber;
  2737. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2738. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2739. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2740. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2741. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2742. goto discardCommand;
  2743. }
  2744. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2745. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2746. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2747. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber)
  2748. goto discardCommand;
  2749. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2750. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2751. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2752. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2753. continue;
  2754. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2755. break;
  2756. }
  2757. if (incomingCommand->reliableSequenceNumber <= reliableSequenceNumber) {
  2758. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2759. break;
  2760. goto discardCommand;
  2761. }
  2762. }
  2763. break;
  2764. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2765. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  2766. unreliableSequenceNumber = ENET_NET_TO_HOST_16(command->sendUnreliable.unreliableSequenceNumber);
  2767. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && unreliableSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  2768. goto discardCommand;
  2769. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2770. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2771. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2772. continue;
  2773. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2774. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2775. continue;
  2776. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2777. break;
  2778. }
  2779. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2780. break;
  2781. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  2782. continue;
  2783. if (incomingCommand->unreliableSequenceNumber <= unreliableSequenceNumber) {
  2784. if (incomingCommand->unreliableSequenceNumber < unreliableSequenceNumber)
  2785. break;
  2786. goto discardCommand;
  2787. }
  2788. }
  2789. break;
  2790. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2791. currentCommand = enet_list_end(&channel->incomingUnreliableCommands);
  2792. break;
  2793. default:
  2794. goto discardCommand;
  2795. }
  2796. if (peer->totalWaitingData >= peer->host->maximumWaitingData)
  2797. goto notifyError;
  2798. packet = enet_packet_create(data, dataLength, flags);
  2799. if (packet == NULL)
  2800. goto notifyError;
  2801. incomingCommand = (ENetIncomingCommand*)enet_malloc(sizeof(ENetIncomingCommand));
  2802. if (incomingCommand == NULL)
  2803. goto notifyError;
  2804. incomingCommand->reliableSequenceNumber = command->header.reliableSequenceNumber;
  2805. incomingCommand->unreliableSequenceNumber = unreliableSequenceNumber & 0xFFFF;
  2806. incomingCommand->command = *command;
  2807. incomingCommand->fragmentCount = fragmentCount;
  2808. incomingCommand->fragmentsRemaining = fragmentCount;
  2809. incomingCommand->packet = packet;
  2810. incomingCommand->fragments = NULL;
  2811. if (fragmentCount > 0) {
  2812. if (fragmentCount <= ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2813. incomingCommand->fragments = (enet_uint32*)enet_malloc((fragmentCount + 31) / 32 * sizeof(enet_uint32));
  2814. if (incomingCommand->fragments == NULL) {
  2815. enet_free(incomingCommand);
  2816. goto notifyError;
  2817. }
  2818. memset(incomingCommand->fragments, 0, (fragmentCount + 31) / 32 * sizeof(enet_uint32));
  2819. }
  2820. if (packet != NULL) {
  2821. ++packet->referenceCount;
  2822. peer->totalWaitingData += packet->dataLength;
  2823. }
  2824. enet_list_insert(enet_list_next(currentCommand), incomingCommand);
  2825. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2826. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2827. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2828. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  2829. break;
  2830. default:
  2831. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2832. break;
  2833. }
  2834. return incomingCommand;
  2835. discardCommand:
  2836. if (fragmentCount > 0)
  2837. goto notifyError;
  2838. if (packet != NULL && packet->referenceCount == 0)
  2839. enet_packet_destroy(packet);
  2840. return &dummyCommand;
  2841. notifyError:
  2842. if (packet != NULL && packet->referenceCount == 0)
  2843. enet_packet_destroy(packet);
  2844. return NULL;
  2845. }
  2846. // =======================================================================//
  2847. // !
  2848. // ! Host
  2849. // !
  2850. // =======================================================================//
  2851. ENetHost* enet_host_create(const ENetAddress* address, size_t peerCount, size_t channelLimit, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth) {
  2852. ENetHost* host;
  2853. ENetPeer* currentPeer;
  2854. if (peerCount > ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2855. return NULL;
  2856. host = (ENetHost*)enet_malloc(sizeof(ENetHost));
  2857. if (host == NULL)
  2858. return NULL;
  2859. memset(host, 0, sizeof(ENetHost));
  2860. host->peers = (ENetPeer*)enet_malloc(peerCount * sizeof(ENetPeer));
  2861. if (host->peers == NULL) {
  2862. enet_free(host);
  2863. return NULL;
  2864. }
  2865. memset(host->peers, 0, peerCount * sizeof(ENetPeer));
  2866. host->socket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
  2867. if (host->socket != ENET_SOCKET_NULL)
  2868. enet_socket_set_option(host->socket, ENET_SOCKOPT_IPV6_V6ONLY, 0);
  2869. if (host->socket == ENET_SOCKET_NULL || (address != NULL && enet_socket_bind(host->socket, address) < 0)) {
  2870. if (host->socket != ENET_SOCKET_NULL)
  2871. enet_socket_destroy(host->socket);
  2872. enet_free(host->peers);
  2873. enet_free(host);
  2874. return NULL;
  2875. }
  2876. enet_socket_set_option(host->socket, ENET_SOCKOPT_NONBLOCK, 1);
  2877. enet_socket_set_option(host->socket, ENET_SOCKOPT_BROADCAST, 1);
  2878. enet_socket_set_option(host->socket, ENET_SOCKOPT_RCVBUF, ENET_HOST_RECEIVE_BUFFER_SIZE);
  2879. enet_socket_set_option(host->socket, ENET_SOCKOPT_SNDBUF, ENET_HOST_SEND_BUFFER_SIZE);
  2880. enet_socket_set_option(host->socket, ENET_SOCKOPT_IPV6_V6ONLY, 0);
  2881. if (address != NULL && enet_socket_get_address(host->socket, &host->address) < 0)
  2882. host->address = *address;
  2883. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  2884. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  2885. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  2886. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  2887. host->randomSeed = (enet_uint32)(size_t)host;
  2888. host->randomSeed += enet_host_random_seed();
  2889. host->randomSeed = (host->randomSeed << 16) | (host->randomSeed >> 16);
  2890. host->channelLimit = channelLimit;
  2891. host->incomingBandwidth = incomingBandwidth;
  2892. host->outgoingBandwidth = outgoingBandwidth;
  2893. host->bandwidthThrottleEpoch = 0;
  2894. host->recalculateBandwidthLimits = 0;
  2895. host->preventConnections = 0;
  2896. host->mtu = ENET_HOST_DEFAULT_MTU;
  2897. host->peerCount = peerCount;
  2898. host->commandCount = 0;
  2899. host->bufferCount = 0;
  2900. host->compression = 0;
  2901. host->checksumCallback = NULL;
  2902. host->receivedAddress.host = ENET_HOST_ANY;
  2903. host->receivedAddress.port = 0;
  2904. host->receivedData = NULL;
  2905. host->receivedDataLength = 0;
  2906. host->totalSentData = 0;
  2907. host->totalSentPackets = 0;
  2908. host->totalReceivedData = 0;
  2909. host->totalReceivedPackets = 0;
  2910. host->connectedPeers = 0;
  2911. host->bandwidthLimitedPeers = 0;
  2912. host->duplicatePeers = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  2913. host->maximumPacketSize = ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE;
  2914. host->maximumWaitingData = ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA;
  2915. host->interceptCallback = NULL;
  2916. enet_list_clear(&host->dispatchQueue);
  2917. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2918. currentPeer->host = host;
  2919. currentPeer->incomingPeerID = currentPeer - host->peers;
  2920. currentPeer->outgoingSessionID = currentPeer->incomingSessionID = 0xFF;
  2921. currentPeer->data = NULL;
  2922. enet_list_clear(&currentPeer->acknowledgements);
  2923. enet_list_clear(&currentPeer->sentReliableCommands);
  2924. enet_list_clear(&currentPeer->sentUnreliableCommands);
  2925. enet_list_clear(&currentPeer->outgoingReliableCommands);
  2926. enet_list_clear(&currentPeer->outgoingUnreliableCommands);
  2927. enet_list_clear(&currentPeer->dispatchedCommands);
  2928. enet_peer_reset(currentPeer);
  2929. }
  2930. return host;
  2931. }
  2932. void enet_host_destroy(ENetHost* host) {
  2933. ENetPeer* currentPeer;
  2934. if (host == NULL)
  2935. return;
  2936. enet_socket_destroy(host->socket);
  2937. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2938. enet_peer_reset(currentPeer);
  2939. }
  2940. enet_free(host->peers);
  2941. enet_free(host);
  2942. }
  2943. void enet_host_enable_compression(ENetHost* host) {
  2944. if (host == NULL)
  2945. return;
  2946. host->compression = 1;
  2947. }
  2948. void enet_host_prevent_connections(ENetHost* host, enet_uint8 state) {
  2949. if (host == NULL)
  2950. return;
  2951. host->preventConnections = state;
  2952. }
  2953. ENetPeer* enet_host_connect(ENetHost* host, const ENetAddress* address, size_t channelCount, enet_uint32 data) {
  2954. ENetPeer* currentPeer;
  2955. ENetChannel* channel;
  2956. ENetProtocol command;
  2957. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  2958. channelCount = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  2959. else if (channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  2960. channelCount = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  2961. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2962. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED)
  2963. break;
  2964. }
  2965. if (currentPeer >= &host->peers[host->peerCount])
  2966. return NULL;
  2967. currentPeer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  2968. if (currentPeer->channels == NULL)
  2969. return NULL;
  2970. currentPeer->channelCount = channelCount;
  2971. currentPeer->state = ENET_PEER_STATE_CONNECTING;
  2972. currentPeer->address = *address;
  2973. currentPeer->connectID = ++host->randomSeed;
  2974. if (host->outgoingBandwidth == 0)
  2975. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  2976. else
  2977. currentPeer->windowSize = (host->outgoingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  2978. if (currentPeer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  2979. currentPeer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  2980. else if (currentPeer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  2981. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  2982. for (channel = currentPeer->channels; channel < &currentPeer->channels[channelCount]; ++channel) {
  2983. channel->outgoingReliableSequenceNumber = 0;
  2984. channel->outgoingUnreliableSequenceNumber = 0;
  2985. channel->incomingReliableSequenceNumber = 0;
  2986. channel->incomingUnreliableSequenceNumber = 0;
  2987. enet_list_clear(&channel->incomingReliableCommands);
  2988. enet_list_clear(&channel->incomingUnreliableCommands);
  2989. channel->usedReliableWindows = 0;
  2990. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  2991. }
  2992. command.header.command = ENET_PROTOCOL_COMMAND_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2993. command.header.channelID = 0xFF;
  2994. command.connect.outgoingPeerID = ENET_HOST_TO_NET_16(currentPeer->incomingPeerID);
  2995. command.connect.incomingSessionID = currentPeer->incomingSessionID;
  2996. command.connect.outgoingSessionID = currentPeer->outgoingSessionID;
  2997. command.connect.mtu = ENET_HOST_TO_NET_32(currentPeer->mtu);
  2998. command.connect.windowSize = ENET_HOST_TO_NET_32(currentPeer->windowSize);
  2999. command.connect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  3000. command.connect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  3001. command.connect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3002. command.connect.packetThrottleInterval = ENET_HOST_TO_NET_32(currentPeer->packetThrottleInterval);
  3003. command.connect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleAcceleration);
  3004. command.connect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleDeceleration);
  3005. command.connect.connectID = currentPeer->connectID;
  3006. command.connect.data = ENET_HOST_TO_NET_32(data);
  3007. enet_peer_queue_outgoing_command(currentPeer, &command, NULL, 0, 0);
  3008. return currentPeer;
  3009. }
  3010. void enet_host_broadcast(ENetHost* host, enet_uint8 channelID, ENetPacket* packet) {
  3011. ENetPeer* currentPeer;
  3012. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3013. if (currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3014. continue;
  3015. enet_peer_send(currentPeer, channelID, packet);
  3016. }
  3017. if (packet->referenceCount == 0)
  3018. enet_packet_destroy(packet);
  3019. }
  3020. void enet_host_broadcast_selective(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer** peers, size_t length) {
  3021. ENetPeer* currentPeer;
  3022. if (host == NULL)
  3023. return;
  3024. for (int i = 0; i < length; i++) {
  3025. currentPeer = peers[i];
  3026. if (currentPeer == NULL || currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3027. continue;
  3028. enet_peer_send(currentPeer, channelID, packet);
  3029. }
  3030. if (packet->referenceCount == 0)
  3031. enet_packet_destroy(packet);
  3032. }
  3033. void enet_host_channel_limit(ENetHost* host, size_t channelLimit) {
  3034. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3035. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3036. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3037. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3038. host->channelLimit = channelLimit;
  3039. }
  3040. void enet_host_bandwidth_limit(ENetHost* host, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth) {
  3041. host->incomingBandwidth = incomingBandwidth;
  3042. host->outgoingBandwidth = outgoingBandwidth;
  3043. host->recalculateBandwidthLimits = 1;
  3044. }
  3045. void enet_host_bandwidth_throttle(ENetHost* host) {
  3046. enet_uint32 timeCurrent = enet_time_get();
  3047. enet_uint32 elapsedTime = timeCurrent - host->bandwidthThrottleEpoch;
  3048. enet_uint32 peersRemaining = (enet_uint32)host->connectedPeers;
  3049. enet_uint32 dataTotal = ~0;
  3050. enet_uint32 bandwidth = ~0;
  3051. enet_uint32 throttle = 0;
  3052. enet_uint32 bandwidthLimit = 0;
  3053. int needsAdjustment = host->bandwidthLimitedPeers > 0 ? 1 : 0;
  3054. ENetPeer* peer;
  3055. ENetProtocol command;
  3056. if (elapsedTime < ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  3057. return;
  3058. if (host->outgoingBandwidth == 0 && host->incomingBandwidth == 0)
  3059. return;
  3060. host->bandwidthThrottleEpoch = timeCurrent;
  3061. if (peersRemaining == 0)
  3062. return;
  3063. if (host->outgoingBandwidth != 0) {
  3064. dataTotal = 0;
  3065. bandwidth = (host->outgoingBandwidth * elapsedTime) / 1000;
  3066. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3067. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3068. continue;
  3069. dataTotal += peer->outgoingDataTotal;
  3070. }
  3071. }
  3072. while (peersRemaining > 0 && needsAdjustment != 0) {
  3073. needsAdjustment = 0;
  3074. if (dataTotal <= bandwidth)
  3075. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3076. else
  3077. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3078. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3079. enet_uint32 peerBandwidth;
  3080. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidth == 0 || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3081. continue;
  3082. peerBandwidth = (peer->incomingBandwidth * elapsedTime) / 1000;
  3083. if ((throttle * peer->outgoingDataTotal) / ENET_PEER_PACKET_THROTTLE_SCALE <= peerBandwidth)
  3084. continue;
  3085. peer->packetThrottleLimit = (peerBandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / peer->outgoingDataTotal;
  3086. if (peer->packetThrottleLimit == 0)
  3087. peer->packetThrottleLimit = 1;
  3088. if (peer->packetThrottle > peer->packetThrottleLimit)
  3089. peer->packetThrottle = peer->packetThrottleLimit;
  3090. peer->outgoingBandwidthThrottleEpoch = timeCurrent;
  3091. peer->incomingDataTotal = 0;
  3092. peer->outgoingDataTotal = 0;
  3093. needsAdjustment = 1;
  3094. --peersRemaining;
  3095. bandwidth -= peerBandwidth;
  3096. dataTotal -= peerBandwidth;
  3097. }
  3098. }
  3099. if (peersRemaining > 0) {
  3100. if (dataTotal <= bandwidth)
  3101. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3102. else
  3103. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3104. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3105. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3106. continue;
  3107. peer->packetThrottleLimit = throttle;
  3108. if (peer->packetThrottle > peer->packetThrottleLimit)
  3109. peer->packetThrottle = peer->packetThrottleLimit;
  3110. peer->incomingDataTotal = 0;
  3111. peer->outgoingDataTotal = 0;
  3112. }
  3113. }
  3114. if (host->recalculateBandwidthLimits) {
  3115. host->recalculateBandwidthLimits = 0;
  3116. peersRemaining = (enet_uint32)host->connectedPeers;
  3117. bandwidth = host->incomingBandwidth;
  3118. needsAdjustment = 1;
  3119. if (bandwidth == 0) {
  3120. bandwidthLimit = 0;
  3121. } else {
  3122. while (peersRemaining > 0 && needsAdjustment != 0) {
  3123. needsAdjustment = 0;
  3124. bandwidthLimit = bandwidth / peersRemaining;
  3125. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3126. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3127. continue;
  3128. if (peer->outgoingBandwidth > 0 && peer->outgoingBandwidth >= bandwidthLimit)
  3129. continue;
  3130. peer->incomingBandwidthThrottleEpoch = timeCurrent;
  3131. needsAdjustment = 1;
  3132. --peersRemaining;
  3133. bandwidth -= peer->outgoingBandwidth;
  3134. }
  3135. }
  3136. }
  3137. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3138. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3139. continue;
  3140. command.header.command = ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3141. command.header.channelID = 0xFF;
  3142. command.bandwidthLimit.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3143. if (peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3144. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(peer->outgoingBandwidth);
  3145. else
  3146. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(bandwidthLimit);
  3147. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  3148. }
  3149. }
  3150. }
  3151. // =======================================================================//
  3152. // !
  3153. // ! Time
  3154. // !
  3155. // =======================================================================//
  3156. #ifdef _WIN32
  3157. static LARGE_INTEGER getFILETIMEoffset() {
  3158. SYSTEMTIME s;
  3159. FILETIME f;
  3160. LARGE_INTEGER t;
  3161. s.wYear = 1970;
  3162. s.wMonth = 1;
  3163. s.wDay = 1;
  3164. s.wHour = 0;
  3165. s.wMinute = 0;
  3166. s.wSecond = 0;
  3167. s.wMilliseconds = 0;
  3168. SystemTimeToFileTime(&s, &f);
  3169. t.QuadPart = f.dwHighDateTime;
  3170. t.QuadPart <<= 32;
  3171. t.QuadPart |= f.dwLowDateTime;
  3172. return t;
  3173. }
  3174. int clock_gettime(int X, struct timespec* tv) {
  3175. LARGE_INTEGER t;
  3176. FILETIME f;
  3177. double microseconds;
  3178. static LARGE_INTEGER offset;
  3179. static double frequencyToMicroseconds;
  3180. static int initialized = 0;
  3181. static BOOL usePerformanceCounter = 0;
  3182. if (!initialized) {
  3183. LARGE_INTEGER performanceFrequency;
  3184. initialized = 1;
  3185. usePerformanceCounter = QueryPerformanceFrequency(&performanceFrequency);
  3186. if (usePerformanceCounter) {
  3187. QueryPerformanceCounter(&offset);
  3188. frequencyToMicroseconds = (double)performanceFrequency.QuadPart / 1000000.;
  3189. } else {
  3190. offset = getFILETIMEoffset();
  3191. frequencyToMicroseconds = 10.;
  3192. }
  3193. }
  3194. if (usePerformanceCounter) {
  3195. QueryPerformanceCounter(&t);
  3196. } else {
  3197. GetSystemTimeAsFileTime(&f);
  3198. t.QuadPart = f.dwHighDateTime;
  3199. t.QuadPart <<= 32;
  3200. t.QuadPart |= f.dwLowDateTime;
  3201. }
  3202. t.QuadPart -= offset.QuadPart;
  3203. microseconds = (double)t.QuadPart / frequencyToMicroseconds;
  3204. t.QuadPart = (LONGLONG)microseconds;
  3205. tv->tv_sec = (long)(t.QuadPart / 1000000);
  3206. tv->tv_nsec = t.QuadPart % 1000000 * 1000;
  3207. return 0;
  3208. }
  3209. #elif __APPLE__ && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200
  3210. #define CLOCK_MONOTONIC 0
  3211. int clock_gettime(int X, struct timespec* ts) {
  3212. clock_serv_t cclock;
  3213. mach_timespec_t mts;
  3214. host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
  3215. clock_get_time(cclock, &mts);
  3216. mach_port_deallocate(mach_task_self(), cclock);
  3217. ts->tv_sec = mts.tv_sec;
  3218. ts->tv_nsec = mts.tv_nsec;
  3219. return 0;
  3220. }
  3221. #endif
  3222. enet_uint32 enet_time_get() {
  3223. static enet_uint64 start_time_ns = 0;
  3224. struct timespec ts;
  3225. #ifdef CLOCK_MONOTONIC_RAW
  3226. clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
  3227. #else
  3228. clock_gettime(CLOCK_MONOTONIC, &ts);
  3229. #endif
  3230. static const enet_uint64 ns_in_s = 1000 * 1000 * 1000;
  3231. static const enet_uint64 ns_in_ms = 1000 * 1000;
  3232. enet_uint64 current_time_ns = ts.tv_nsec + (enet_uint64)ts.tv_sec * ns_in_s;
  3233. enet_uint64 offset_ns = ENET_ATOMIC_READ(&start_time_ns);
  3234. if (offset_ns == 0) {
  3235. enet_uint64 want_value = current_time_ns - 1 * ns_in_ms;
  3236. enet_uint64 old_value = ENET_ATOMIC_CAS(&start_time_ns, 0, want_value);
  3237. offset_ns = old_value == 0 ? want_value : old_value;
  3238. }
  3239. enet_uint64 result_in_ns = current_time_ns - offset_ns;
  3240. return (enet_uint32)(result_in_ns / ns_in_ms);
  3241. }
  3242. // =======================================================================//
  3243. // !
  3244. // ! Extended functionality
  3245. // !
  3246. // =======================================================================//
  3247. void* enet_packet_get_data(ENetPacket* packet) {
  3248. return (void*)packet->data;
  3249. }
  3250. int enet_packet_get_length(ENetPacket* packet) {
  3251. return packet->dataLength;
  3252. }
  3253. void enet_packet_set_free_callback(ENetPacket* packet, const void* callback) {
  3254. packet->freeCallback = (ENetPacketFreeCallback)callback;
  3255. }
  3256. int enet_packet_check_references(ENetPacket* packet) {
  3257. return (int)packet->referenceCount;
  3258. }
  3259. void enet_packet_dispose(ENetPacket* packet) {
  3260. if (packet->referenceCount == 0)
  3261. enet_packet_destroy(packet);
  3262. }
  3263. enet_uint32 enet_host_get_peers_count(ENetHost* host) {
  3264. return host->connectedPeers;
  3265. }
  3266. enet_uint32 enet_host_get_packets_sent(ENetHost* host) {
  3267. return host->totalSentPackets;
  3268. }
  3269. enet_uint32 enet_host_get_packets_received(ENetHost* host) {
  3270. return host->totalReceivedPackets;
  3271. }
  3272. enet_uint32 enet_host_get_bytes_sent(ENetHost* host) {
  3273. return host->totalSentData;
  3274. }
  3275. enet_uint32 enet_host_get_bytes_received(ENetHost* host) {
  3276. return host->totalReceivedData;
  3277. }
  3278. enet_uint32 enet_peer_get_id(ENetPeer* peer) {
  3279. return peer->connectID;
  3280. }
  3281. int enet_peer_get_ip(ENetPeer* peer, char* ip, size_t ipLength) {
  3282. return enet_address_get_host_ip(&peer->address, ip, ipLength);
  3283. }
  3284. enet_uint16 enet_peer_get_port(ENetPeer* peer) {
  3285. return peer->address.port;
  3286. }
  3287. enet_uint32 enet_peer_get_mtu(ENetPeer* peer) {
  3288. return peer->mtu;
  3289. }
  3290. ENetPeerState enet_peer_get_state(ENetPeer* peer) {
  3291. return peer->state;
  3292. }
  3293. enet_uint32 enet_peer_get_rtt(ENetPeer* peer) {
  3294. return peer->smoothedRoundTripTime;
  3295. }
  3296. enet_uint32 enet_peer_get_lastsendtime(ENetPeer* peer) {
  3297. return peer->lastSendTime;
  3298. }
  3299. enet_uint32 enet_peer_get_lastreceivetime(ENetPeer* peer) {
  3300. return peer->lastReceiveTime;
  3301. }
  3302. enet_uint64 enet_peer_get_packets_sent(ENetPeer* peer) {
  3303. return peer->totalPacketsSent;
  3304. }
  3305. enet_uint32 enet_peer_get_packets_lost(ENetPeer* peer) {
  3306. return peer->totalPacketsLost;
  3307. }
  3308. enet_uint64 enet_peer_get_bytes_sent(ENetPeer* peer) {
  3309. return peer->totalDataSent;
  3310. }
  3311. enet_uint64 enet_peer_get_bytes_received(ENetPeer* peer) {
  3312. return peer->totalDataReceived;
  3313. }
  3314. void* enet_peer_get_data(ENetPeer* peer) {
  3315. return (void*)peer->data;
  3316. }
  3317. void enet_peer_set_data(ENetPeer* peer, const void* data) {
  3318. peer->data = (enet_uint32*)data;
  3319. }
  3320. // =======================================================================//
  3321. // !
  3322. // ! Platform Specific (Unix)
  3323. // !
  3324. // =======================================================================//
  3325. #ifndef _WIN32
  3326. int enet_initialize(void) {
  3327. return 0;
  3328. }
  3329. void enet_deinitialize(void) { }
  3330. enet_uint64 enet_host_random_seed(void) {
  3331. return (enet_uint64)time(NULL);
  3332. }
  3333. int enet_address_set_host_ip(ENetAddress* address, const char* name) {
  3334. if (!inet_pton(AF_INET6, name, &address->host))
  3335. return -1;
  3336. return 0;
  3337. }
  3338. int enet_address_set_host(ENetAddress* address, const char* name) {
  3339. struct addrinfo hints, * resultList = NULL, * result = NULL;
  3340. memset(&hints, 0, sizeof(hints));
  3341. hints.ai_family = AF_UNSPEC;
  3342. if (getaddrinfo(name, NULL, &hints, &resultList) != 0)
  3343. return -1;
  3344. for (result = resultList; result != NULL; result = result->ai_next) {
  3345. if (result->ai_addr != NULL && result->ai_addrlen >= sizeof(struct sockaddr_in)) {
  3346. if (result->ai_family == AF_INET) {
  3347. struct sockaddr_in* sin = (struct sockaddr_in*)result->ai_addr;
  3348. ((enet_uint32*)&address->host.s6_addr)[0] = 0;
  3349. ((enet_uint32*)&address->host.s6_addr)[1] = 0;
  3350. ((enet_uint32*)&address->host.s6_addr)[2] = htonl(0xffff);
  3351. ((enet_uint32*)&address->host.s6_addr)[3] = sin->sin_addr.s_addr;
  3352. freeaddrinfo(resultList);
  3353. return 0;
  3354. } else if (result->ai_family == AF_INET6) {
  3355. struct sockaddr_in6* sin = (struct sockaddr_in6*)result->ai_addr;
  3356. address->host = sin->sin6_addr;
  3357. address->scope = sin->sin6_scope_id;
  3358. freeaddrinfo(resultList);
  3359. return 0;
  3360. }
  3361. }
  3362. }
  3363. if (resultList != NULL)
  3364. freeaddrinfo(resultList);
  3365. return enet_address_set_host_ip(address, name);
  3366. }
  3367. int enet_address_get_host_ip(const ENetAddress* address, char* name, size_t nameLength) {
  3368. if (inet_ntop(AF_INET6, &address->host, name, nameLength) == NULL)
  3369. return -1;
  3370. return 0;
  3371. }
  3372. int enet_address_get_host(const ENetAddress* address, char* name, size_t nameLength) {
  3373. struct sockaddr_in6 sin;
  3374. int err;
  3375. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3376. sin.sin6_family = AF_INET6;
  3377. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3378. sin.sin6_addr = address->host;
  3379. sin.sin6_scope_id = address->scope;
  3380. err = getnameinfo((struct sockaddr*)&sin, sizeof(sin), name, nameLength, NULL, 0, NI_NAMEREQD);
  3381. if (!err) {
  3382. if (name != NULL && nameLength > 0 && !memchr(name, '\0', nameLength))
  3383. return -1;
  3384. return 0;
  3385. }
  3386. if (err != EAI_NONAME)
  3387. return -1;
  3388. return enet_address_get_host_ip(address, name, nameLength);
  3389. }
  3390. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3391. struct sockaddr_in6 sin;
  3392. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3393. sin.sin6_family = AF_INET6;
  3394. if (address != NULL) {
  3395. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3396. sin.sin6_addr = address->host;
  3397. sin.sin6_scope_id = address->scope;
  3398. } else {
  3399. sin.sin6_port = 0;
  3400. sin.sin6_addr = ENET_HOST_ANY;
  3401. sin.sin6_scope_id = 0;
  3402. }
  3403. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3404. }
  3405. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3406. struct sockaddr_in6 sin;
  3407. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3408. if (getsockname(socket, (struct sockaddr*)&sin, &sinLength) == -1)
  3409. return -1;
  3410. address->host = sin.sin6_addr;
  3411. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3412. address->scope = sin.sin6_scope_id;
  3413. return 0;
  3414. }
  3415. int enet_socket_listen(ENetSocket socket, int backlog) {
  3416. return listen(socket, backlog < 0 ? SOMAXCONN : backlog);
  3417. }
  3418. ENetSocket enet_socket_create(ENetSocketType type) {
  3419. return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
  3420. }
  3421. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3422. int result = -1;
  3423. switch (option) {
  3424. case ENET_SOCKOPT_NONBLOCK:
  3425. result = fcntl(socket, F_SETFL, (value ? O_NONBLOCK : 0) | (fcntl(socket, F_GETFL) & ~O_NONBLOCK));
  3426. break;
  3427. case ENET_SOCKOPT_BROADCAST:
  3428. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3429. break;
  3430. case ENET_SOCKOPT_REUSEADDR:
  3431. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3432. break;
  3433. case ENET_SOCKOPT_RCVBUF:
  3434. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3435. break;
  3436. case ENET_SOCKOPT_SNDBUF:
  3437. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3438. break;
  3439. case ENET_SOCKOPT_RCVTIMEO: {
  3440. struct timeval timeVal;
  3441. timeVal.tv_sec = value / 1000;
  3442. timeVal.tv_usec = (value % 1000) * 1000;
  3443. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3444. break;
  3445. }
  3446. case ENET_SOCKOPT_SNDTIMEO: {
  3447. struct timeval timeVal;
  3448. timeVal.tv_sec = value / 1000;
  3449. timeVal.tv_usec = (value % 1000) * 1000;
  3450. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3451. break;
  3452. }
  3453. case ENET_SOCKOPT_NODELAY:
  3454. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3455. break;
  3456. case ENET_SOCKOPT_IPV6_V6ONLY:
  3457. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3458. break;
  3459. default:
  3460. break;
  3461. }
  3462. return result == -1 ? -1 : 0;
  3463. }
  3464. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3465. int result = -1;
  3466. socklen_t len;
  3467. switch (option) {
  3468. case ENET_SOCKOPT_ERROR:
  3469. len = sizeof(int);
  3470. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, value, &len);
  3471. break;
  3472. default:
  3473. break;
  3474. }
  3475. return result == -1 ? -1 : 0;
  3476. }
  3477. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3478. struct sockaddr_in6 sin;
  3479. int result;
  3480. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3481. sin.sin6_family = AF_INET6;
  3482. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3483. sin.sin6_addr = address->host;
  3484. sin.sin6_scope_id = address->scope;
  3485. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3486. if (result == -1 && errno == EINPROGRESS)
  3487. return 0;
  3488. return result;
  3489. }
  3490. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3491. int result;
  3492. struct sockaddr_in6 sin;
  3493. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3494. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3495. if (result == -1)
  3496. return ENET_SOCKET_NULL;
  3497. if (address != NULL) {
  3498. address->host = sin.sin6_addr;
  3499. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3500. address->scope = sin.sin6_scope_id;
  3501. }
  3502. return result;
  3503. }
  3504. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3505. return shutdown(socket, (int)how);
  3506. }
  3507. void enet_socket_destroy(ENetSocket socket) {
  3508. if (socket != -1)
  3509. close(socket);
  3510. }
  3511. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3512. struct msghdr msgHdr;
  3513. struct sockaddr_in6 sin;
  3514. int sentLength;
  3515. memset(&msgHdr, 0, sizeof(struct msghdr));
  3516. if (address != NULL) {
  3517. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3518. sin.sin6_family = AF_INET6;
  3519. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3520. sin.sin6_addr = address->host;
  3521. sin.sin6_scope_id = address->scope;
  3522. msgHdr.msg_name = &sin;
  3523. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3524. }
  3525. msgHdr.msg_iov = (struct iovec*)buffers;
  3526. msgHdr.msg_iovlen = bufferCount;
  3527. sentLength = sendmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3528. if (sentLength == -1) {
  3529. if (errno == EWOULDBLOCK)
  3530. return 0;
  3531. return -1;
  3532. }
  3533. return sentLength;
  3534. }
  3535. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3536. struct msghdr msgHdr;
  3537. struct sockaddr_in6 sin;
  3538. int recvLength;
  3539. memset(&msgHdr, 0, sizeof(struct msghdr));
  3540. if (address != NULL) {
  3541. msgHdr.msg_name = &sin;
  3542. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3543. }
  3544. msgHdr.msg_iov = (struct iovec*)buffers;
  3545. msgHdr.msg_iovlen = bufferCount;
  3546. recvLength = recvmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3547. if (recvLength == -1) {
  3548. if (errno == EWOULDBLOCK)
  3549. return 0;
  3550. return -1;
  3551. }
  3552. if (msgHdr.msg_flags & MSG_TRUNC)
  3553. return -1;
  3554. if (address != NULL) {
  3555. address->host = sin.sin6_addr;
  3556. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3557. address->scope = sin.sin6_scope_id;
  3558. }
  3559. return recvLength;
  3560. }
  3561. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3562. struct timeval timeVal;
  3563. timeVal.tv_sec = timeout / 1000;
  3564. timeVal.tv_usec = (timeout % 1000) * 1000;
  3565. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3566. }
  3567. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3568. struct pollfd pollSocket;
  3569. int pollCount;
  3570. pollSocket.fd = socket;
  3571. pollSocket.events = 0;
  3572. if (*condition & ENET_SOCKET_WAIT_SEND)
  3573. pollSocket.events |= POLLOUT;
  3574. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3575. pollSocket.events |= POLLIN;
  3576. pollCount = poll(&pollSocket, 1, timeout);
  3577. if (pollCount < 0) {
  3578. if (errno == EINTR && *condition & ENET_SOCKET_WAIT_INTERRUPT) {
  3579. *condition = ENET_SOCKET_WAIT_INTERRUPT;
  3580. return 0;
  3581. }
  3582. return -1;
  3583. }
  3584. *condition = ENET_SOCKET_WAIT_NONE;
  3585. if (pollCount == 0)
  3586. return 0;
  3587. if (pollSocket.revents & POLLOUT)
  3588. *condition |= ENET_SOCKET_WAIT_SEND;
  3589. if (pollSocket.revents & POLLIN)
  3590. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3591. return 0;
  3592. }
  3593. #endif
  3594. // =======================================================================//
  3595. // !
  3596. // ! Platform Specific (Win)
  3597. // !
  3598. // =======================================================================//
  3599. #ifdef _WIN32
  3600. int enet_initialize(void) {
  3601. WORD versionRequested = MAKEWORD(1, 1);
  3602. WSADATA wsaData;
  3603. if (WSAStartup(versionRequested, &wsaData))
  3604. return -1;
  3605. if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1) {
  3606. WSACleanup();
  3607. return -1;
  3608. }
  3609. timeBeginPeriod(1);
  3610. return 0;
  3611. }
  3612. void enet_deinitialize(void) {
  3613. timeEndPeriod(1);
  3614. WSACleanup();
  3615. }
  3616. enet_uint64 enet_host_random_seed(void) {
  3617. return (enet_uint64)timeGetTime();
  3618. }
  3619. int enet_address_set_host_ip(ENetAddress* address, const char* name) {
  3620. enet_uint8 vals[4] = { 0, 0, 0, 0 };
  3621. int i;
  3622. for (i = 0; i < 4; ++i) {
  3623. const char* next = name + 1;
  3624. if (*name != '0') {
  3625. long val = strtol(name, (char**)&next, 10);
  3626. if (val < 0 || val > 255 || next == name || next - name > 3)
  3627. return -1;
  3628. vals[i] = (enet_uint8)val;
  3629. }
  3630. if (*next != (i < 3 ? '.' : '\0'))
  3631. return -1;
  3632. name = next + 1;
  3633. }
  3634. memcpy(&address->host, vals, sizeof(enet_uint32));
  3635. return 0;
  3636. }
  3637. int enet_address_set_host(ENetAddress* address, const char* name) {
  3638. struct hostent* hostEntry = NULL;
  3639. hostEntry = gethostbyname(name);
  3640. if (hostEntry == NULL || hostEntry->h_addrtype != AF_INET) {
  3641. if (!inet_pton(AF_INET6, name, &address->host))
  3642. return -1;
  3643. return 0;
  3644. }
  3645. ((enet_uint32*)&address->host.s6_addr)[0] = 0;
  3646. ((enet_uint32*)&address->host.s6_addr)[1] = 0;
  3647. ((enet_uint32*)&address->host.s6_addr)[2] = htonl(0xffff);
  3648. ((enet_uint32*)&address->host.s6_addr)[3] = *(enet_uint32*)hostEntry->h_addr_list[0];
  3649. return 0;
  3650. }
  3651. int enet_address_get_host_ip(const ENetAddress* address, char* name, size_t nameLength) {
  3652. if (inet_ntop(AF_INET6, (PVOID)&address->host, name, nameLength) == NULL)
  3653. return -1;
  3654. return 0;
  3655. }
  3656. int enet_address_get_host(const ENetAddress* address, char* name, size_t nameLength) {
  3657. struct in6_addr in;
  3658. struct hostent* hostEntry = NULL;
  3659. in = address->host;
  3660. hostEntry = gethostbyaddr((char*)&in, sizeof(struct in6_addr), AF_INET6);
  3661. if (hostEntry == NULL) {
  3662. return enet_address_get_host_ip(address, name, nameLength);
  3663. } else {
  3664. size_t hostLen = strlen(hostEntry->h_name);
  3665. if (hostLen >= nameLength)
  3666. return -1;
  3667. memcpy(name, hostEntry->h_name, hostLen + 1);
  3668. }
  3669. return 0;
  3670. }
  3671. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3672. struct sockaddr_in6 sin;
  3673. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3674. sin.sin6_family = AF_INET6;
  3675. if (address != NULL) {
  3676. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3677. sin.sin6_addr = address->host;
  3678. sin.sin6_scope_id = address->scope;
  3679. } else {
  3680. sin.sin6_port = 0;
  3681. sin.sin6_addr = in6addr_any;
  3682. sin.sin6_scope_id = 0;
  3683. }
  3684. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)) == SOCKET_ERROR ? -1 : 0;
  3685. }
  3686. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3687. struct sockaddr_in6 sin;
  3688. int sinLength = sizeof(struct sockaddr_in6);
  3689. if (getsockname(socket, (struct sockaddr*)&sin, &sinLength) == -1)
  3690. return -1;
  3691. address->host = sin.sin6_addr;
  3692. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3693. address->scope = sin.sin6_scope_id;
  3694. return 0;
  3695. }
  3696. int enet_socket_listen(ENetSocket socket, int backlog) {
  3697. return listen(socket, backlog < 0 ? SOMAXCONN : backlog) == SOCKET_ERROR ? -1 : 0;
  3698. }
  3699. ENetSocket enet_socket_create(ENetSocketType type) {
  3700. return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
  3701. }
  3702. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3703. int result = SOCKET_ERROR;
  3704. switch (option) {
  3705. case ENET_SOCKOPT_NONBLOCK: {
  3706. u_long nonBlocking = (u_long)value;
  3707. result = ioctlsocket(socket, FIONBIO, &nonBlocking);
  3708. break;
  3709. }
  3710. case ENET_SOCKOPT_BROADCAST:
  3711. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3712. break;
  3713. case ENET_SOCKOPT_REUSEADDR:
  3714. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3715. break;
  3716. case ENET_SOCKOPT_RCVBUF:
  3717. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3718. break;
  3719. case ENET_SOCKOPT_SNDBUF:
  3720. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3721. break;
  3722. case ENET_SOCKOPT_RCVTIMEO:
  3723. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&value, sizeof(int));
  3724. break;
  3725. case ENET_SOCKOPT_SNDTIMEO:
  3726. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&value, sizeof(int));
  3727. break;
  3728. case ENET_SOCKOPT_NODELAY:
  3729. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3730. break;
  3731. case ENET_SOCKOPT_IPV6_V6ONLY:
  3732. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3733. break;
  3734. default:
  3735. break;
  3736. }
  3737. return result == SOCKET_ERROR ? -1 : 0;
  3738. }
  3739. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3740. int result = SOCKET_ERROR, len;
  3741. switch (option) {
  3742. case ENET_SOCKOPT_ERROR:
  3743. len = sizeof(int);
  3744. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, (char*)value, &len);
  3745. break;
  3746. default:
  3747. break;
  3748. }
  3749. return result == SOCKET_ERROR ? -1 : 0;
  3750. }
  3751. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3752. struct sockaddr_in6 sin;
  3753. int result;
  3754. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3755. sin.sin6_family = AF_INET6;
  3756. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3757. sin.sin6_addr = address->host;
  3758. sin.sin6_scope_id = address->scope;
  3759. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3760. if (result == SOCKET_ERROR && WSAGetLastError() != WSAEWOULDBLOCK)
  3761. return -1;
  3762. return 0;
  3763. }
  3764. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3765. SOCKET result;
  3766. struct sockaddr_in6 sin;
  3767. int sinLength = sizeof(struct sockaddr_in6);
  3768. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3769. if (result == INVALID_SOCKET)
  3770. return ENET_SOCKET_NULL;
  3771. if (address != NULL) {
  3772. address->host = sin.sin6_addr;
  3773. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3774. address->scope = sin.sin6_scope_id;
  3775. }
  3776. return result;
  3777. }
  3778. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3779. return shutdown(socket, (int)how) == SOCKET_ERROR ? -1 : 0;
  3780. }
  3781. void enet_socket_destroy(ENetSocket socket) {
  3782. if (socket != INVALID_SOCKET)
  3783. closesocket(socket);
  3784. }
  3785. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3786. struct sockaddr_in6 sin;
  3787. DWORD sentLength;
  3788. if (address != NULL) {
  3789. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3790. sin.sin6_family = AF_INET6;
  3791. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3792. sin.sin6_addr = address->host;
  3793. sin.sin6_scope_id = address->scope;
  3794. }
  3795. 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)
  3796. return (WSAGetLastError() == WSAEWOULDBLOCK) ? 0 : 1;
  3797. return (int)sentLength;
  3798. }
  3799. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3800. INT sinLength = sizeof(struct sockaddr_in6);
  3801. DWORD flags = 0, recvLength;
  3802. struct sockaddr_in6 sin;
  3803. if (WSARecvFrom(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &recvLength, &flags, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL, NULL, NULL) == SOCKET_ERROR) {
  3804. switch (WSAGetLastError()) {
  3805. case WSAEWOULDBLOCK:
  3806. case WSAECONNRESET:
  3807. return 0;
  3808. }
  3809. return -1;
  3810. }
  3811. if (flags & MSG_PARTIAL)
  3812. return -1;
  3813. if (address != NULL) {
  3814. address->host = sin.sin6_addr;
  3815. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3816. address->scope = sin.sin6_scope_id;
  3817. }
  3818. return (int)recvLength;
  3819. }
  3820. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3821. struct timeval timeVal;
  3822. timeVal.tv_sec = timeout / 1000;
  3823. timeVal.tv_usec = (timeout % 1000) * 1000;
  3824. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3825. }
  3826. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3827. fd_set readSet, writeSet;
  3828. struct timeval timeVal;
  3829. int selectCount;
  3830. timeVal.tv_sec = timeout / 1000;
  3831. timeVal.tv_usec = (timeout % 1000) * 1000;
  3832. FD_ZERO(&readSet);
  3833. FD_ZERO(&writeSet);
  3834. if (*condition & ENET_SOCKET_WAIT_SEND)
  3835. FD_SET(socket, &writeSet);
  3836. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3837. FD_SET(socket, &readSet);
  3838. selectCount = select(socket + 1, &readSet, &writeSet, NULL, &timeVal);
  3839. if (selectCount < 0)
  3840. return -1;
  3841. *condition = ENET_SOCKET_WAIT_NONE;
  3842. if (selectCount == 0)
  3843. return 0;
  3844. if (FD_ISSET(socket, &writeSet))
  3845. *condition |= ENET_SOCKET_WAIT_SEND;
  3846. if (FD_ISSET(socket, &readSet))
  3847. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3848. return 0;
  3849. }
  3850. #endif
  3851. #ifdef __cplusplus
  3852. }
  3853. #endif
  3854. #endif
  3855. #endif