enet.h 175 KB

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  1. /*
  2. * ENet reliable UDP networking library
  3. * Copyright (c) 2018 Lee Salzman, Vladyslav Hrytsenko, Dominik Madarász, Stanislav Denisov
  4. *
  5. * Permission is hereby granted, free of charge, to any person obtaining a copy
  6. * of this software and associated documentation files (the "Software"), to deal
  7. * in the Software without restriction, including without limitation the rights
  8. * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  9. * copies of the Software, and to permit persons to whom the Software is
  10. * furnished to do so, subject to the following conditions:
  11. *
  12. * The above copyright notice and this permission notice shall be included in all
  13. * copies or substantial portions of the Software.
  14. *
  15. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18. * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21. * SOFTWARE.
  22. */
  23. #ifndef ENET_H
  24. #define ENET_H
  25. #include <stdlib.h>
  26. #include <stdbool.h>
  27. #include <stdint.h>
  28. #include <time.h>
  29. #define ENET_VERSION_MAJOR 2
  30. #define ENET_VERSION_MINOR 4
  31. #define ENET_VERSION_PATCH 4
  32. #define ENET_VERSION_CREATE(major, minor, patch) (((major) << 16) | ((minor) << 8) | (patch))
  33. #define ENET_VERSION_GET_MAJOR(version) (((version) >> 16) & 0xFF)
  34. #define ENET_VERSION_GET_MINOR(version) (((version) >> 8) & 0xFF)
  35. #define ENET_VERSION_GET_PATCH(version) ((version) & 0xFF)
  36. #define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH)
  37. #define ENET_TIME_OVERFLOW 86400000
  38. #define ENET_TIME_LESS(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW)
  39. #define ENET_TIME_GREATER(a, b) ((b) - (a) >= ENET_TIME_OVERFLOW)
  40. #define ENET_TIME_LESS_EQUAL(a, b) (!ENET_TIME_GREATER(a, b))
  41. #define ENET_TIME_GREATER_EQUAL(a, b) (!ENET_TIME_LESS(a, b))
  42. #define ENET_TIME_DIFFERENCE(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW ? (b) - (a) : (a) - (b))
  43. #define ENET_MAX(x, y) ((x) > (y) ? (x) : (y))
  44. #define ENET_MIN(x, y) ((x) < (y) ? (x) : (y))
  45. /*
  46. =======================================================================
  47. System differences
  48. =======================================================================
  49. */
  50. #ifdef _WIN32
  51. #ifndef ENET_NO_PRAGMA_LINK
  52. #pragma comment(lib, "ws2_32.lib")
  53. #pragma comment(lib, "winmm.lib")
  54. #endif
  55. #if _MSC_VER >= 1910
  56. /* It looks like there were changes as of Visual Studio 2017 and there are no 32/64 bit
  57. versions of _InterlockedExchange[operation], only InterlockedExchange[operation]
  58. (without leading underscore), so we have to distinguish between compiler versions */
  59. #define ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  60. #endif
  61. #include <winsock2.h>
  62. #include <ws2tcpip.h>
  63. #include <mmsystem.h>
  64. #include <intrin.h>
  65. #if defined(_WIN32) && defined(_MSC_VER)
  66. #if _MSC_VER < 1900
  67. typedef struct timespec {
  68. long tv_sec;
  69. long tv_nsec;
  70. };
  71. #endif
  72. #define CLOCK_MONOTONIC 0
  73. #endif
  74. typedef SOCKET ENetSocket;
  75. #define ENET_SOCKET_NULL INVALID_SOCKET
  76. typedef struct {
  77. size_t dataLength;
  78. void* data;
  79. } ENetBuffer;
  80. #define ENET_CALLBACK __cdecl
  81. #ifdef ENET_DLL
  82. #ifdef ENET_IMPLEMENTATION
  83. #define ENET_API __declspec(dllexport)
  84. #else
  85. #define ENET_API __declspec(dllimport)
  86. #endif
  87. #else
  88. #define ENET_API extern
  89. #endif
  90. #else
  91. #include <sys/types.h>
  92. #include <sys/ioctl.h>
  93. #include <sys/time.h>
  94. #include <sys/socket.h>
  95. #include <poll.h>
  96. #include <arpa/inet.h>
  97. #include <netinet/in.h>
  98. #include <netinet/tcp.h>
  99. #include <netdb.h>
  100. #include <unistd.h>
  101. #include <string.h>
  102. #include <errno.h>
  103. #include <fcntl.h>
  104. #ifdef __APPLE__
  105. #include <mach/clock.h>
  106. #include <mach/mach.h>
  107. #include <Availability.h>
  108. #endif
  109. #ifndef MSG_NOSIGNAL
  110. #define MSG_NOSIGNAL 0
  111. #endif
  112. #ifdef MSG_MAXIOVLEN
  113. #define ENET_BUFFER_MAXIMUM MSG_MAXIOVLEN
  114. #endif
  115. typedef int ENetSocket;
  116. #define ENET_SOCKET_NULL -1
  117. typedef struct {
  118. void* data;
  119. size_t dataLength;
  120. } ENetBuffer;
  121. #define ENET_CALLBACK
  122. #define ENET_API extern
  123. #endif
  124. #ifndef ENET_BUFFER_MAXIMUM
  125. #define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS)
  126. #endif
  127. #define ENET_HOST_ANY in6addr_any
  128. #define ENET_PORT_ANY 0
  129. #define ENET_HOST_SIZE 1025
  130. #define ENET_HOST_TO_NET_16(value) (htons(value))
  131. #define ENET_HOST_TO_NET_32(value) (htonl(value))
  132. #define ENET_NET_TO_HOST_16(value) (ntohs(value))
  133. #define ENET_NET_TO_HOST_32(value) (ntohl(value))
  134. #if __BIG_ENDIAN__
  135. #define ENET_HOST_TO_NET_64(x) (x)
  136. #define ENET_NET_TO_HOST_64(x) (x)
  137. #else
  138. #define ENET_HOST_TO_NET_64(x) (((uint64_t)htonl((x) & 0xFFFFFFFF) << 32) | htonl((x) >> 32))
  139. #define ENET_NET_TO_HOST_64(x) (((uint64_t)ntohl((x) & 0xFFFFFFFF) << 32) | ntohl((x) >> 32))
  140. #endif
  141. #ifdef __cplusplus
  142. extern "C" {
  143. #endif
  144. /*
  145. =======================================================================
  146. Internals
  147. =======================================================================
  148. */
  149. typedef uint32_t ENetVersion;
  150. typedef fd_set ENetSocketSet;
  151. typedef struct _ENetCallbacks {
  152. void* (ENET_CALLBACK *malloc)(size_t size);
  153. void (ENET_CALLBACK *free)(void* memory);
  154. void (ENET_CALLBACK *noMemory)(void);
  155. } ENetCallbacks;
  156. extern void* enet_malloc(size_t);
  157. extern void enet_free(void*);
  158. typedef struct _ENetListNode {
  159. struct _ENetListNode* next;
  160. struct _ENetListNode* previous;
  161. } ENetListNode;
  162. typedef ENetListNode* ENetListIterator;
  163. typedef struct _ENetList {
  164. ENetListNode sentinel;
  165. } ENetList;
  166. extern ENetListIterator enet_list_insert(ENetListIterator, void*);
  167. extern ENetListIterator enet_list_move(ENetListIterator, void*, void*);
  168. extern void* enet_list_remove(ENetListIterator);
  169. extern void enet_list_clear(ENetList*);
  170. extern size_t enet_list_size(ENetList*);
  171. #define enet_list_begin(list) ((list)->sentinel.next)
  172. #define enet_list_end(list) (&(list)->sentinel)
  173. #define enet_list_empty(list) (enet_list_begin(list) == enet_list_end(list))
  174. #define enet_list_next(iterator) ((iterator)->next)
  175. #define enet_list_previous(iterator) ((iterator)->previous)
  176. #define enet_list_front(list) ((void*)(list)->sentinel.next)
  177. #define enet_list_back(list) ((void*)(list)->sentinel.previous)
  178. #define enet_in6_equal(a, b) (memcmp(&a, &b, sizeof(struct in6_addr)) == 0)
  179. /*
  180. =======================================================================
  181. Protocol
  182. =======================================================================
  183. */
  184. enum {
  185. ENET_PROTOCOL_MINIMUM_MTU = 576,
  186. ENET_PROTOCOL_MAXIMUM_MTU = 4096,
  187. ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS = 32,
  188. ENET_PROTOCOL_MINIMUM_WINDOW_SIZE = 4096,
  189. ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE = 65536,
  190. ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT = 1,
  191. ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT = 255,
  192. ENET_PROTOCOL_MAXIMUM_PEER_ID = 0xFFF,
  193. ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT = 1024 * 1024
  194. };
  195. typedef enum _ENetProtocolCommand {
  196. ENET_PROTOCOL_COMMAND_NONE = 0,
  197. ENET_PROTOCOL_COMMAND_ACKNOWLEDGE = 1,
  198. ENET_PROTOCOL_COMMAND_CONNECT = 2,
  199. ENET_PROTOCOL_COMMAND_VERIFY_CONNECT = 3,
  200. ENET_PROTOCOL_COMMAND_DISCONNECT = 4,
  201. ENET_PROTOCOL_COMMAND_PING = 5,
  202. ENET_PROTOCOL_COMMAND_SEND_RELIABLE = 6,
  203. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE = 7,
  204. ENET_PROTOCOL_COMMAND_SEND_FRAGMENT = 8,
  205. ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED = 9,
  206. ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT = 10,
  207. ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE = 11,
  208. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT = 12,
  209. ENET_PROTOCOL_COMMAND_COUNT = 13,
  210. ENET_PROTOCOL_COMMAND_MASK = 0x0F
  211. } ENetProtocolCommand;
  212. typedef enum _ENetProtocolFlag {
  213. ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE = (1 << 7),
  214. ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED = (1 << 6),
  215. ENET_PROTOCOL_HEADER_FLAG_SENT_TIME = (1 << 14),
  216. ENET_PROTOCOL_HEADER_FLAG_MASK = ENET_PROTOCOL_HEADER_FLAG_SENT_TIME,
  217. ENET_PROTOCOL_HEADER_SESSION_MASK = (3 << 12),
  218. ENET_PROTOCOL_HEADER_SESSION_SHIFT = 12
  219. } ENetProtocolFlag;
  220. #ifdef _MSC_VER
  221. #pragma pack(push, 1)
  222. #define ENET_PACKED
  223. #elif defined(__GNUC__) || defined(__clang__)
  224. #define ENET_PACKED __attribute__ ((packed))
  225. #else
  226. #define ENET_PACKED
  227. #endif
  228. typedef struct _ENetProtocolHeader {
  229. uint16_t peerID;
  230. uint16_t sentTime;
  231. } ENET_PACKED ENetProtocolHeader;
  232. typedef struct _ENetProtocolCommandHeader {
  233. uint8_t command;
  234. uint8_t channelID;
  235. uint16_t reliableSequenceNumber;
  236. } ENET_PACKED ENetProtocolCommandHeader;
  237. typedef struct _ENetProtocolAcknowledge {
  238. ENetProtocolCommandHeader header;
  239. uint16_t receivedReliableSequenceNumber;
  240. uint16_t receivedSentTime;
  241. } ENET_PACKED ENetProtocolAcknowledge;
  242. typedef struct _ENetProtocolConnect {
  243. ENetProtocolCommandHeader header;
  244. uint16_t outgoingPeerID;
  245. uint8_t incomingSessionID;
  246. uint8_t outgoingSessionID;
  247. uint32_t mtu;
  248. uint32_t windowSize;
  249. uint32_t channelCount;
  250. uint32_t incomingBandwidth;
  251. uint32_t outgoingBandwidth;
  252. uint32_t packetThrottleInterval;
  253. uint32_t packetThrottleAcceleration;
  254. uint32_t packetThrottleDeceleration;
  255. uint32_t connectID;
  256. uint32_t data;
  257. } ENET_PACKED ENetProtocolConnect;
  258. typedef struct _ENetProtocolVerifyConnect {
  259. ENetProtocolCommandHeader header;
  260. uint16_t outgoingPeerID;
  261. uint8_t incomingSessionID;
  262. uint8_t outgoingSessionID;
  263. uint32_t mtu;
  264. uint32_t windowSize;
  265. uint32_t channelCount;
  266. uint32_t incomingBandwidth;
  267. uint32_t outgoingBandwidth;
  268. uint32_t packetThrottleInterval;
  269. uint32_t packetThrottleAcceleration;
  270. uint32_t packetThrottleDeceleration;
  271. uint32_t connectID;
  272. } ENET_PACKED ENetProtocolVerifyConnect;
  273. typedef struct _ENetProtocolBandwidthLimit {
  274. ENetProtocolCommandHeader header;
  275. uint32_t incomingBandwidth;
  276. uint32_t outgoingBandwidth;
  277. } ENET_PACKED ENetProtocolBandwidthLimit;
  278. typedef struct _ENetProtocolThrottleConfigure {
  279. ENetProtocolCommandHeader header;
  280. uint32_t packetThrottleInterval;
  281. uint32_t packetThrottleAcceleration;
  282. uint32_t packetThrottleDeceleration;
  283. } ENET_PACKED ENetProtocolThrottleConfigure;
  284. typedef struct _ENetProtocolDisconnect {
  285. ENetProtocolCommandHeader header;
  286. uint32_t data;
  287. } ENET_PACKED ENetProtocolDisconnect;
  288. typedef struct _ENetProtocolPing {
  289. ENetProtocolCommandHeader header;
  290. } ENET_PACKED ENetProtocolPing;
  291. typedef struct _ENetProtocolSendReliable {
  292. ENetProtocolCommandHeader header;
  293. uint16_t dataLength;
  294. } ENET_PACKED ENetProtocolSendReliable;
  295. typedef struct _ENetProtocolSendUnreliable {
  296. ENetProtocolCommandHeader header;
  297. uint16_t unreliableSequenceNumber;
  298. uint16_t dataLength;
  299. } ENET_PACKED ENetProtocolSendUnreliable;
  300. typedef struct _ENetProtocolSendUnsequenced {
  301. ENetProtocolCommandHeader header;
  302. uint16_t unsequencedGroup;
  303. uint16_t dataLength;
  304. } ENET_PACKED ENetProtocolSendUnsequenced;
  305. typedef struct _ENetProtocolSendFragment {
  306. ENetProtocolCommandHeader header;
  307. uint16_t startSequenceNumber;
  308. uint16_t dataLength;
  309. uint32_t fragmentCount;
  310. uint32_t fragmentNumber;
  311. uint32_t totalLength;
  312. uint32_t fragmentOffset;
  313. } ENET_PACKED ENetProtocolSendFragment;
  314. typedef union _ENetProtocol {
  315. ENetProtocolCommandHeader header;
  316. ENetProtocolAcknowledge acknowledge;
  317. ENetProtocolConnect connect;
  318. ENetProtocolVerifyConnect verifyConnect;
  319. ENetProtocolDisconnect disconnect;
  320. ENetProtocolPing ping;
  321. ENetProtocolSendReliable sendReliable;
  322. ENetProtocolSendUnreliable sendUnreliable;
  323. ENetProtocolSendUnsequenced sendUnsequenced;
  324. ENetProtocolSendFragment sendFragment;
  325. ENetProtocolBandwidthLimit bandwidthLimit;
  326. ENetProtocolThrottleConfigure throttleConfigure;
  327. } ENET_PACKED ENetProtocol;
  328. #ifdef _MSC_VER
  329. #pragma pack(pop)
  330. #endif
  331. /*
  332. =======================================================================
  333. General structs/enums
  334. =======================================================================
  335. */
  336. typedef enum _ENetSocketType {
  337. ENET_SOCKET_TYPE_STREAM = 1,
  338. ENET_SOCKET_TYPE_DATAGRAM = 2
  339. } ENetSocketType;
  340. typedef enum _ENetSocketWait {
  341. ENET_SOCKET_WAIT_NONE = 0,
  342. ENET_SOCKET_WAIT_SEND = (1 << 0),
  343. ENET_SOCKET_WAIT_RECEIVE = (1 << 1),
  344. ENET_SOCKET_WAIT_INTERRUPT = (1 << 2)
  345. } ENetSocketWait;
  346. typedef enum _ENetSocketOption {
  347. ENET_SOCKOPT_NONBLOCK = 1,
  348. ENET_SOCKOPT_BROADCAST = 2,
  349. ENET_SOCKOPT_RCVBUF = 3,
  350. ENET_SOCKOPT_SNDBUF = 4,
  351. ENET_SOCKOPT_REUSEADDR = 5,
  352. ENET_SOCKOPT_RCVTIMEO = 6,
  353. ENET_SOCKOPT_SNDTIMEO = 7,
  354. ENET_SOCKOPT_ERROR = 8,
  355. ENET_SOCKOPT_NODELAY = 9,
  356. ENET_SOCKOPT_IPV6_V6ONLY = 10
  357. } ENetSocketOption;
  358. typedef enum _ENetSocketShutdown {
  359. ENET_SOCKET_SHUTDOWN_READ = 0,
  360. ENET_SOCKET_SHUTDOWN_WRITE = 1,
  361. ENET_SOCKET_SHUTDOWN_READ_WRITE = 2
  362. } ENetSocketShutdown;
  363. typedef struct _ENetAddress {
  364. union {
  365. struct in6_addr ipv6;
  366. struct {
  367. uint8_t zeros[10];
  368. uint16_t ffff;
  369. struct in_addr ip;
  370. } ipv4;
  371. };
  372. uint16_t port;
  373. } ENetAddress;
  374. typedef enum _ENetPacketFlag {
  375. ENET_PACKET_FLAG_NONE = 0,
  376. ENET_PACKET_FLAG_RELIABLE = (1 << 0),
  377. ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1),
  378. ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2),
  379. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED = (1 << 3),
  380. ENET_PACKET_FLAG_INSTANT = (1 << 4),
  381. ENET_PACKET_FLAG_UNTHROTTLED = (1 << 5),
  382. ENET_PACKET_FLAG_SENT = (1 << 8)
  383. } ENetPacketFlag;
  384. typedef void (ENET_CALLBACK *ENetPacketFreeCallback)(void*);
  385. typedef struct _ENetPacket {
  386. uint32_t flags;
  387. uint32_t dataLength;
  388. uint8_t* data;
  389. ENetPacketFreeCallback freeCallback;
  390. uint32_t referenceCount;
  391. void* userData;
  392. } ENetPacket;
  393. typedef struct _ENetAcknowledgement {
  394. ENetListNode acknowledgementList;
  395. uint32_t sentTime;
  396. ENetProtocol command;
  397. } ENetAcknowledgement;
  398. typedef struct _ENetOutgoingCommand {
  399. ENetListNode outgoingCommandList;
  400. uint16_t reliableSequenceNumber;
  401. uint16_t unreliableSequenceNumber;
  402. uint32_t sentTime;
  403. uint32_t roundTripTimeout;
  404. uint32_t roundTripTimeoutLimit;
  405. uint32_t fragmentOffset;
  406. uint16_t fragmentLength;
  407. uint16_t sendAttempts;
  408. ENetProtocol command;
  409. ENetPacket* packet;
  410. } ENetOutgoingCommand;
  411. typedef struct _ENetIncomingCommand {
  412. ENetListNode incomingCommandList;
  413. uint16_t reliableSequenceNumber;
  414. uint16_t unreliableSequenceNumber;
  415. ENetProtocol command;
  416. uint32_t fragmentCount;
  417. uint32_t fragmentsRemaining;
  418. uint32_t* fragments;
  419. ENetPacket* packet;
  420. } ENetIncomingCommand;
  421. typedef enum _ENetPeerState {
  422. ENET_PEER_STATE_DISCONNECTED = 0,
  423. ENET_PEER_STATE_CONNECTING = 1,
  424. ENET_PEER_STATE_ACKNOWLEDGING_CONNECT = 2,
  425. ENET_PEER_STATE_CONNECTION_PENDING = 3,
  426. ENET_PEER_STATE_CONNECTION_SUCCEEDED = 4,
  427. ENET_PEER_STATE_CONNECTED = 5,
  428. ENET_PEER_STATE_DISCONNECT_LATER = 6,
  429. ENET_PEER_STATE_DISCONNECTING = 7,
  430. ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT = 8,
  431. ENET_PEER_STATE_ZOMBIE = 9
  432. } ENetPeerState;
  433. enum {
  434. ENET_HOST_BUFFER_SIZE_MIN = 256 * 1024,
  435. ENET_HOST_BUFFER_SIZE_MAX = 1024 * 1024,
  436. ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000,
  437. ENET_HOST_DEFAULT_MTU = 1280,
  438. ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024,
  439. ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
  440. ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 1,
  441. ENET_PEER_DEFAULT_PACKET_THROTTLE = 32,
  442. ENET_PEER_PACKET_THROTTLE_THRESHOLD = 40,
  443. ENET_PEER_PACKET_THROTTLE_SCALE = 32,
  444. ENET_PEER_PACKET_THROTTLE_COUNTER = 7,
  445. ENET_PEER_PACKET_THROTTLE_ACCELERATION = 2,
  446. ENET_PEER_PACKET_THROTTLE_DECELERATION = 2,
  447. ENET_PEER_PACKET_THROTTLE_INTERVAL = 5000,
  448. ENET_PEER_WINDOW_SIZE_SCALE = 64 * 1024,
  449. ENET_PEER_TIMEOUT_LIMIT = 32,
  450. ENET_PEER_TIMEOUT_MINIMUM = 5000,
  451. ENET_PEER_TIMEOUT_MAXIMUM = 30000,
  452. ENET_PEER_PING_INTERVAL = 250,
  453. ENET_PEER_UNSEQUENCED_WINDOWS = 64,
  454. ENET_PEER_UNSEQUENCED_WINDOW_SIZE = 1024,
  455. ENET_PEER_FREE_UNSEQUENCED_WINDOWS = 32,
  456. ENET_PEER_RELIABLE_WINDOWS = 16,
  457. ENET_PEER_RELIABLE_WINDOW_SIZE = 0x1000,
  458. ENET_PEER_FREE_RELIABLE_WINDOWS = 8
  459. };
  460. typedef struct _ENetChannel {
  461. uint16_t outgoingReliableSequenceNumber;
  462. uint16_t outgoingUnreliableSequenceNumber;
  463. uint16_t usedReliableWindows;
  464. uint16_t reliableWindows[ENET_PEER_RELIABLE_WINDOWS];
  465. uint16_t incomingReliableSequenceNumber;
  466. uint16_t incomingUnreliableSequenceNumber;
  467. ENetList incomingReliableCommands;
  468. ENetList incomingUnreliableCommands;
  469. } ENetChannel;
  470. typedef struct _ENetPeer {
  471. ENetListNode dispatchList;
  472. struct _ENetHost* host;
  473. uint16_t outgoingPeerID;
  474. uint16_t incomingPeerID;
  475. uint32_t connectID;
  476. uint8_t outgoingSessionID;
  477. uint8_t incomingSessionID;
  478. ENetAddress address;
  479. void* data;
  480. ENetPeerState state;
  481. ENetChannel* channels;
  482. size_t channelCount;
  483. uint32_t incomingBandwidth;
  484. uint32_t outgoingBandwidth;
  485. uint32_t incomingBandwidthThrottleEpoch;
  486. uint32_t outgoingBandwidthThrottleEpoch;
  487. uint32_t incomingDataTotal;
  488. uint64_t totalDataReceived;
  489. uint32_t outgoingDataTotal;
  490. uint64_t totalDataSent;
  491. uint32_t lastSendTime;
  492. uint32_t lastReceiveTime;
  493. uint32_t nextTimeout;
  494. uint32_t earliestTimeout;
  495. uint64_t totalPacketsSent;
  496. uint64_t totalPacketsLost;
  497. uint32_t packetThrottle;
  498. uint32_t packetThrottleThreshold;
  499. uint32_t packetThrottleLimit;
  500. uint32_t packetThrottleCounter;
  501. uint32_t packetThrottleEpoch;
  502. uint32_t packetThrottleAcceleration;
  503. uint32_t packetThrottleDeceleration;
  504. uint32_t packetThrottleInterval;
  505. uint32_t pingInterval;
  506. uint32_t timeoutLimit;
  507. uint32_t timeoutMinimum;
  508. uint32_t timeoutMaximum;
  509. uint32_t lastRoundTripTime;
  510. uint32_t lowestRoundTripTime;
  511. uint32_t lastRoundTripTimeVariance;
  512. uint32_t highestRoundTripTimeVariance;
  513. uint32_t roundTripTime;
  514. uint32_t roundTripTimeVariance;
  515. uint32_t mtu;
  516. uint32_t windowSize;
  517. uint32_t reliableDataInTransit;
  518. uint16_t outgoingReliableSequenceNumber;
  519. ENetList acknowledgements;
  520. ENetList sentReliableCommands;
  521. ENetList sentUnreliableCommands;
  522. ENetList outgoingCommands;
  523. ENetList dispatchedCommands;
  524. int needsDispatch;
  525. uint16_t incomingUnsequencedGroup;
  526. uint16_t outgoingUnsequencedGroup;
  527. uint32_t unsequencedWindow[ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32];
  528. uint32_t eventData;
  529. size_t totalWaitingData;
  530. } ENetPeer;
  531. typedef enum _ENetEventType {
  532. ENET_EVENT_TYPE_NONE = 0,
  533. ENET_EVENT_TYPE_CONNECT = 1,
  534. ENET_EVENT_TYPE_DISCONNECT = 2,
  535. ENET_EVENT_TYPE_RECEIVE = 3,
  536. ENET_EVENT_TYPE_DISCONNECT_TIMEOUT = 4
  537. } ENetEventType;
  538. typedef struct _ENetEvent {
  539. ENetEventType type;
  540. ENetPeer* peer;
  541. uint8_t channelID;
  542. uint32_t data;
  543. ENetPacket* packet;
  544. } ENetEvent;
  545. typedef uint64_t (ENET_CALLBACK *ENetChecksumCallback)(const ENetBuffer* buffers, int bufferCount);
  546. typedef int (ENET_CALLBACK *ENetInterceptCallback)(ENetEvent* event, ENetAddress* address, uint8_t* receivedData, int receivedDataLength);
  547. typedef struct _ENetHost {
  548. ENetSocket socket;
  549. ENetAddress address;
  550. uint32_t incomingBandwidth;
  551. uint32_t outgoingBandwidth;
  552. uint32_t bandwidthThrottleEpoch;
  553. uint32_t mtu;
  554. uint32_t randomSeed;
  555. int recalculateBandwidthLimits;
  556. uint8_t preventConnections;
  557. ENetPeer* peers;
  558. size_t peerCount;
  559. size_t channelLimit;
  560. uint32_t serviceTime;
  561. ENetList dispatchQueue;
  562. int continueSending;
  563. size_t packetSize;
  564. uint16_t headerFlags;
  565. uint32_t totalSentData;
  566. uint32_t totalSentPackets;
  567. uint32_t totalReceivedData;
  568. uint32_t totalReceivedPackets;
  569. ENetProtocol commands[ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
  570. size_t commandCount;
  571. ENetBuffer buffers[ENET_BUFFER_MAXIMUM];
  572. size_t bufferCount;
  573. ENetChecksumCallback checksumCallback;
  574. uint8_t packetData[2][ENET_PROTOCOL_MAXIMUM_MTU];
  575. ENetAddress receivedAddress;
  576. uint8_t* receivedData;
  577. size_t receivedDataLength;
  578. ENetInterceptCallback interceptCallback;
  579. size_t connectedPeers;
  580. size_t bandwidthLimitedPeers;
  581. size_t duplicatePeers;
  582. size_t maximumPacketSize;
  583. size_t maximumWaitingData;
  584. } ENetHost;
  585. /*
  586. =======================================================================
  587. Public API
  588. =======================================================================
  589. */
  590. ENET_API int enet_initialize(void);
  591. ENET_API int enet_initialize_with_callbacks(ENetVersion, const ENetCallbacks*);
  592. ENET_API void enet_deinitialize(void);
  593. ENET_API ENetVersion enet_linked_version(void);
  594. ENET_API int enet_array_is_zeroed(const uint8_t*, int);
  595. ENET_API uint32_t enet_time_get(void);
  596. ENET_API uint64_t enet_crc64(const ENetBuffer*, int);
  597. ENET_API ENetPacket* enet_packet_create(const void*, size_t, uint32_t);
  598. ENET_API ENetPacket* enet_packet_create_offset(const void*, size_t, size_t, uint32_t);
  599. ENET_API void enet_packet_destroy(ENetPacket*);
  600. ENET_API int enet_peer_send(ENetPeer*, uint8_t, ENetPacket*);
  601. ENET_API ENetPacket* enet_peer_receive(ENetPeer*, uint8_t*);
  602. ENET_API void enet_peer_ping(ENetPeer*);
  603. ENET_API void enet_peer_ping_interval(ENetPeer*, uint32_t);
  604. ENET_API void enet_peer_timeout(ENetPeer*, uint32_t, uint32_t, uint32_t);
  605. ENET_API void enet_peer_reset(ENetPeer*);
  606. ENET_API void enet_peer_disconnect(ENetPeer*, uint32_t);
  607. ENET_API void enet_peer_disconnect_now(ENetPeer*, uint32_t);
  608. ENET_API void enet_peer_disconnect_later(ENetPeer*, uint32_t);
  609. ENET_API void enet_peer_throttle_configure(ENetPeer*, uint32_t, uint32_t, uint32_t, uint32_t);
  610. ENET_API ENetHost* enet_host_create(const ENetAddress*, size_t, size_t, uint32_t, uint32_t, int);
  611. ENET_API void enet_host_destroy(ENetHost*);
  612. ENET_API void enet_host_prevent_connections(ENetHost*, uint8_t);
  613. ENET_API ENetPeer* enet_host_connect(ENetHost*, const ENetAddress*, size_t, uint32_t);
  614. ENET_API int enet_host_check_events(ENetHost*, ENetEvent*);
  615. ENET_API int enet_host_service(ENetHost*, ENetEvent*, uint32_t);
  616. ENET_API void enet_host_flush(ENetHost*);
  617. ENET_API void enet_host_broadcast(ENetHost*, uint8_t, ENetPacket*);
  618. ENET_API void enet_host_broadcast_exclude(ENetHost*, uint8_t, ENetPacket*, ENetPeer*);
  619. ENET_API void enet_host_broadcast_selective(ENetHost*, uint8_t, ENetPacket*, ENetPeer**, size_t);
  620. ENET_API void enet_host_channel_limit(ENetHost*, size_t);
  621. ENET_API void enet_host_bandwidth_limit(ENetHost*, uint32_t, uint32_t);
  622. ENET_API int enet_address_set_ip(ENetAddress*, const char*);
  623. ENET_API int enet_address_set_hostname(ENetAddress*, const char*);
  624. ENET_API int enet_address_get_ip(const ENetAddress*, char*, size_t);
  625. ENET_API int enet_address_get_hostname(const ENetAddress*, char*, size_t);
  626. ENET_API ENetSocket enet_socket_create(ENetSocketType);
  627. ENET_API int enet_socket_bind(ENetSocket, const ENetAddress*);
  628. ENET_API int enet_socket_get_address(ENetSocket, ENetAddress*);
  629. ENET_API int enet_socket_listen(ENetSocket, int);
  630. ENET_API ENetSocket enet_socket_accept(ENetSocket, ENetAddress*);
  631. ENET_API int enet_socket_connect(ENetSocket, const ENetAddress*);
  632. ENET_API int enet_socket_send(ENetSocket, const ENetAddress*, const ENetBuffer*, size_t);
  633. ENET_API int enet_socket_receive(ENetSocket, ENetAddress*, ENetBuffer*, size_t);
  634. ENET_API int enet_socket_wait(ENetSocket, uint32_t*, uint64_t);
  635. ENET_API int enet_socket_set_option(ENetSocket, ENetSocketOption, int);
  636. ENET_API int enet_socket_get_option(ENetSocket, ENetSocketOption, int*);
  637. ENET_API int enet_socket_shutdown(ENetSocket, ENetSocketShutdown);
  638. ENET_API void enet_socket_destroy(ENetSocket);
  639. ENET_API int enet_socket_set_select(ENetSocket, ENetSocketSet*, ENetSocketSet*, uint32_t);
  640. /* Extended API for easier binding in other programming languages */
  641. ENET_API void* enet_packet_get_data(const ENetPacket*);
  642. ENET_API void* enet_packet_get_user_data(const ENetPacket*);
  643. ENET_API void enet_packet_set_user_data(ENetPacket*, void* userData);
  644. ENET_API int enet_packet_get_length(const ENetPacket*);
  645. ENET_API void enet_packet_set_free_callback(ENetPacket*, ENetPacketFreeCallback);
  646. ENET_API int enet_packet_check_references(const ENetPacket*);
  647. ENET_API void enet_packet_dispose(ENetPacket*);
  648. ENET_API uint32_t enet_host_get_peers_count(const ENetHost*);
  649. ENET_API uint32_t enet_host_get_packets_sent(const ENetHost*);
  650. ENET_API uint32_t enet_host_get_packets_received(const ENetHost*);
  651. ENET_API uint32_t enet_host_get_bytes_sent(const ENetHost*);
  652. ENET_API uint32_t enet_host_get_bytes_received(const ENetHost*);
  653. ENET_API void enet_host_set_max_duplicate_peers(ENetHost*, uint16_t);
  654. ENET_API void enet_host_set_intercept_callback(ENetHost*, ENetInterceptCallback);
  655. ENET_API void enet_host_set_checksum_callback(ENetHost*, ENetChecksumCallback);
  656. ENET_API uint32_t enet_peer_get_id(const ENetPeer*);
  657. ENET_API int enet_peer_get_ip(const ENetPeer*, char*, size_t);
  658. ENET_API uint16_t enet_peer_get_port(const ENetPeer*);
  659. ENET_API uint32_t enet_peer_get_mtu(const ENetPeer*);
  660. ENET_API ENetPeerState enet_peer_get_state(const ENetPeer*);
  661. ENET_API uint32_t enet_peer_get_rtt(const ENetPeer*);
  662. ENET_API uint32_t enet_peer_get_last_rtt(const ENetPeer* peer);
  663. ENET_API uint32_t enet_peer_get_lastsendtime(const ENetPeer*);
  664. ENET_API uint32_t enet_peer_get_lastreceivetime(const ENetPeer*);
  665. ENET_API uint64_t enet_peer_get_packets_sent(const ENetPeer*);
  666. ENET_API uint64_t enet_peer_get_packets_lost(const ENetPeer*);
  667. ENET_API float enet_peer_get_packets_throttle(const ENetPeer*);
  668. ENET_API uint64_t enet_peer_get_bytes_sent(const ENetPeer*);
  669. ENET_API uint64_t enet_peer_get_bytes_received(const ENetPeer*);
  670. ENET_API void* enet_peer_get_data(const ENetPeer*);
  671. ENET_API void enet_peer_set_data(ENetPeer*, const void*);
  672. /*
  673. =======================================================================
  674. Private API
  675. =======================================================================
  676. */
  677. extern void enet_host_bandwidth_throttle(ENetHost*);
  678. extern uint64_t enet_host_random_seed(void);
  679. extern int enet_peer_throttle(ENetPeer*, uint32_t);
  680. extern void enet_peer_reset_queues(ENetPeer*);
  681. extern void enet_peer_setup_outgoing_command(ENetPeer*, ENetOutgoingCommand*);
  682. extern ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer*, const ENetProtocol*, ENetPacket*, uint32_t, uint16_t);
  683. extern ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer*, const ENetProtocol*, const void*, size_t, uint32_t, uint32_t);
  684. extern ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer*, const ENetProtocol*, uint16_t);
  685. extern void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer*, ENetChannel*, ENetIncomingCommand*);
  686. extern void enet_peer_dispatch_incoming_reliable_commands(ENetPeer*, ENetChannel*, ENetIncomingCommand*);
  687. extern void enet_peer_on_connect(ENetPeer*);
  688. extern void enet_peer_on_disconnect(ENetPeer*);
  689. extern size_t enet_protocol_command_size(uint8_t);
  690. #ifdef __cplusplus
  691. }
  692. #endif
  693. #if defined(ENET_IMPLEMENTATION) && !defined(ENET_IMPLEMENTATION_DONE)
  694. #define ENET_IMPLEMENTATION_DONE 1
  695. #ifdef _MSC_VER
  696. #pragma warning(push)
  697. #pragma warning(disable: 4244) /* 64-bit to 32-bit integer conversion */
  698. #pragma warning(disable: 4267) /* size_t to integer conversion */
  699. #endif
  700. /*
  701. =======================================================================
  702. Atomics
  703. =======================================================================
  704. */
  705. #ifdef _MSC_VER
  706. #define ENET_AT_CASSERT_PRED(predicate) sizeof(char[2 * !!(predicate) - 1])
  707. #define ENET_IS_SUPPORTED_ATOMIC(size) ENET_AT_CASSERT_PRED(size == 1 || size == 2 || size == 4 || size == 8)
  708. #define ENET_ATOMIC_SIZEOF(variable) (ENET_IS_SUPPORTED_ATOMIC(sizeof(*(variable))), sizeof(*(variable)))
  709. __inline int64_t enet_at_atomic_read(char* ptr, size_t size) {
  710. switch (size) {
  711. case 1:
  712. return _InterlockedExchangeAdd8((volatile char*)ptr, 0);
  713. case 2:
  714. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, 0);
  715. case 4:
  716. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  717. return InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  718. #else
  719. return _InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  720. #endif
  721. case 8:
  722. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  723. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  724. #else
  725. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  726. #endif
  727. default:
  728. return 0x0;
  729. }
  730. }
  731. __inline int64_t enet_at_atomic_write(char* ptr, int64_t value, size_t size) {
  732. switch (size) {
  733. case 1:
  734. return _InterlockedExchange8((volatile char*)ptr, (char)value);
  735. case 2:
  736. return _InterlockedExchange16((volatile SHORT*)ptr, (SHORT)value);
  737. case 4:
  738. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  739. return InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  740. #else
  741. return _InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  742. #endif
  743. case 8:
  744. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  745. return InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  746. #else
  747. return _InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  748. #endif
  749. default:
  750. return 0x0;
  751. }
  752. }
  753. __inline int64_t enet_at_atomic_cas(char* ptr, int64_t new_val, int64_t old_val, size_t size) {
  754. switch (size) {
  755. case 1:
  756. return _InterlockedCompareExchange8((volatile char*)ptr, (char)new_val, (char)old_val);
  757. case 2:
  758. return _InterlockedCompareExchange16((volatile SHORT*)ptr, (SHORT)new_val, (SHORT)old_val);
  759. case 4:
  760. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  761. return InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  762. #else
  763. return _InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  764. #endif
  765. case 8:
  766. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  767. return InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  768. #else
  769. return _InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  770. #endif
  771. default:
  772. return 0x0;
  773. }
  774. }
  775. __inline int64_t enet_at_atomic_inc(char* ptr, int64_t delta, size_t data_size) {
  776. switch (data_size) {
  777. case 1:
  778. return _InterlockedExchangeAdd8((volatile char*)ptr, (char)delta);
  779. case 2:
  780. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, (SHORT)delta);
  781. case 4:
  782. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  783. return InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  784. #else
  785. return _InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  786. #endif
  787. case 8:
  788. #ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  789. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  790. #else
  791. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  792. #endif
  793. default:
  794. return 0x0;
  795. }
  796. }
  797. #define ENET_ATOMIC_READ(variable) enet_at_atomic_read((char*)(variable), ENET_ATOMIC_SIZEOF(variable))
  798. #define ENET_ATOMIC_WRITE(variable, new_val) enet_at_atomic_write((char*)(variable), (int64_t)(new_val), ENET_ATOMIC_SIZEOF(variable))
  799. #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))
  800. #define ENET_ATOMIC_INC(variable) enet_at_atomic_inc((char*)(variable), 1, ENET_ATOMIC_SIZEOF(variable))
  801. #define ENET_ATOMIC_DEC(variable) enet_at_atomic_inc((char*)(variable), -1, ENET_ATOMIC_SIZEOF(variable))
  802. #define ENET_ATOMIC_INC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), (delta), ENET_ATOMIC_SIZEOF(variable))
  803. #define ENET_ATOMIC_DEC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), -(delta), ENET_ATOMIC_SIZEOF(variable))
  804. #elif defined(__GNUC__) || defined(__clang__)
  805. #if defined(__clang__) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
  806. #define AT_HAVE_ATOMICS
  807. #endif
  808. /* We want to use __atomic built-ins if possible because the __sync primitives are
  809. deprecated, because the __atomic build-ins allow us to use ENET_ATOMIC_WRITE on
  810. uninitialized memory without running into undefined behavior, and because the
  811. __atomic versions generate more efficient code since we don't need to rely on
  812. CAS when we don't actually want it.
  813. Note that we use acquire-release memory order (like mutexes do). We could use
  814. sequentially consistent memory order but that has lower performance and is
  815. almost always unneeded. */
  816. #ifdef AT_HAVE_ATOMICS
  817. #define ENET_ATOMIC_READ(ptr) __atomic_load_n((ptr), __ATOMIC_ACQUIRE)
  818. #define ENET_ATOMIC_WRITE(ptr, value) __atomic_store_n((ptr), (value), __ATOMIC_RELEASE)
  819. #ifndef typeof
  820. #define typeof __typeof__
  821. #endif
  822. /* clang_analyzer doesn't know that CAS writes to memory so it complains about
  823. potentially lost data. Replace the code with the equivalent non-sync code. */
  824. #ifdef __clang_analyzer__
  825. #define ENET_ATOMIC_CAS(ptr, old_value, new_value)\
  826. ({\
  827. typeof(*(ptr)) ENET_ATOMIC_CAS_old_actual_ = (*(ptr));\
  828. if (ATOMIC_CAS_old_actual_ == (old_value))\
  829. *(ptr) = new_value;\
  830. ENET_ATOMIC_CAS_old_actual_;\
  831. })
  832. #else
  833. /* Could use __auto_type instead of typeof but that shouldn't work in C++.
  834. The ({ }) syntax is a GCC extension called statement expression. It lets
  835. us return a value out of the macro.
  836. TODO We should return bool here instead of the old value to avoid the ABA
  837. problem. */
  838. #define ENET_ATOMIC_CAS(ptr, old_value, new_value)\
  839. ({\
  840. typeof(*(ptr)) ENET_ATOMIC_CAS_expected_ = (old_value);\
  841. __atomic_compare_exchange_n((ptr), &ENET_ATOMIC_CAS_expected_, (new_value), false,\
  842. __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE);\
  843. ENET_ATOMIC_CAS_expected_;\
  844. })
  845. #endif
  846. #define ENET_ATOMIC_INC(ptr) __atomic_fetch_add((ptr), 1, __ATOMIC_ACQ_REL)
  847. #define ENET_ATOMIC_DEC(ptr) __atomic_fetch_sub((ptr), 1, __ATOMIC_ACQ_REL)
  848. #define ENET_ATOMIC_INC_BY(ptr, delta) __atomic_fetch_add((ptr), (delta), __ATOMIC_ACQ_REL)
  849. #define ENET_ATOMIC_DEC_BY(ptr, delta) __atomic_fetch_sub((ptr), (delta), __ATOMIC_ACQ_REL)
  850. #else
  851. #define ENET_ATOMIC_READ(variable) __sync_fetch_and_add(variable, 0)
  852. #define ENET_ATOMIC_WRITE(variable, new_val) (void)__sync_val_compare_and_swap((variable), *(variable), (new_val))
  853. #define ENET_ATOMIC_CAS(variable, old_value, new_val) __sync_val_compare_and_swap((variable), (old_value), (new_val))
  854. #define ENET_ATOMIC_INC(variable) __sync_fetch_and_add((variable), 1)
  855. #define ENET_ATOMIC_DEC(variable) __sync_fetch_and_sub((variable), 1)
  856. #define ENET_ATOMIC_INC_BY(variable, delta) __sync_fetch_and_add((variable), (delta), 1)
  857. #define ENET_ATOMIC_DEC_BY(variable, delta) __sync_fetch_and_sub((variable), (delta), 1)
  858. #endif
  859. #undef AT_HAVE_ATOMICS
  860. #endif
  861. /*
  862. =======================================================================
  863. Callbacks
  864. =======================================================================
  865. */
  866. static ENetCallbacks callbacks = {
  867. malloc,
  868. free,
  869. abort
  870. };
  871. int enet_initialize_with_callbacks(ENetVersion version, const ENetCallbacks* inits) {
  872. if (version < ENET_VERSION_CREATE(1, 3, 0))
  873. return -1;
  874. if (inits->malloc != NULL || inits->free != NULL) {
  875. if (inits->malloc == NULL || inits->free == NULL)
  876. return -1;
  877. callbacks.malloc = inits->malloc;
  878. callbacks.free = inits->free;
  879. }
  880. if (inits->noMemory != NULL)
  881. callbacks.noMemory = inits->noMemory;
  882. return enet_initialize();
  883. }
  884. void* enet_malloc(size_t size) {
  885. void* memory = callbacks.malloc(size);
  886. if (memory == NULL)
  887. callbacks.noMemory();
  888. return memory;
  889. }
  890. void enet_free(void* memory) {
  891. callbacks.free(memory);
  892. }
  893. /*
  894. =======================================================================
  895. List
  896. =======================================================================
  897. */
  898. void enet_list_clear(ENetList* list) {
  899. list->sentinel.next = &list->sentinel;
  900. list->sentinel.previous = &list->sentinel;
  901. }
  902. ENetListIterator enet_list_insert(ENetListIterator position, void* data) {
  903. ENetListIterator result = (ENetListIterator)data;
  904. result->previous = position->previous;
  905. result->next = position;
  906. result->previous->next = result;
  907. position->previous = result;
  908. return result;
  909. }
  910. void* enet_list_remove(ENetListIterator position) {
  911. position->previous->next = position->next;
  912. position->next->previous = position->previous;
  913. return position;
  914. }
  915. ENetListIterator enet_list_move(ENetListIterator position, void* dataFirst, void* dataLast) {
  916. ENetListIterator first = (ENetListIterator)dataFirst;
  917. ENetListIterator last = (ENetListIterator)dataLast;
  918. first->previous->next = last->next;
  919. last->next->previous = first->previous;
  920. first->previous = position->previous;
  921. last->next = position;
  922. first->previous->next = first;
  923. position->previous = last;
  924. return first;
  925. }
  926. size_t enet_list_size(ENetList* list) {
  927. size_t size = 0;
  928. ENetListIterator position;
  929. for (position = enet_list_begin(list); position != enet_list_end(list); position = enet_list_next(position)) {
  930. ++size;
  931. }
  932. return size;
  933. }
  934. /*
  935. =======================================================================
  936. Utilities
  937. =======================================================================
  938. */
  939. ENetVersion enet_linked_version(void) {
  940. return ENET_VERSION;
  941. }
  942. int enet_array_is_zeroed(const uint8_t* array, int length) {
  943. size_t i;
  944. for (i = 0; i < length; i++) {
  945. if (array[i] != 0)
  946. return -1;
  947. }
  948. return 0;
  949. }
  950. /*
  951. =======================================================================
  952. Time
  953. =======================================================================
  954. */
  955. #ifdef _WIN32
  956. static LARGE_INTEGER gettime_offset(void) {
  957. SYSTEMTIME s;
  958. FILETIME f;
  959. LARGE_INTEGER t;
  960. s.wYear = 1970;
  961. s.wMonth = 1;
  962. s.wDay = 1;
  963. s.wHour = 0;
  964. s.wMinute = 0;
  965. s.wSecond = 0;
  966. s.wMilliseconds = 0;
  967. SystemTimeToFileTime(&s, &f);
  968. t.QuadPart = f.dwHighDateTime;
  969. t.QuadPart <<= 32;
  970. t.QuadPart |= f.dwLowDateTime;
  971. return t;
  972. }
  973. int clock_gettime(int X, struct timespec* tv) {
  974. LARGE_INTEGER t;
  975. FILETIME f;
  976. double microseconds;
  977. static LARGE_INTEGER offset;
  978. static double frequencyToMicroseconds;
  979. static int initialized = 0;
  980. static BOOL usePerformanceCounter = 0;
  981. if (!initialized) {
  982. LARGE_INTEGER performanceFrequency;
  983. initialized = 1;
  984. usePerformanceCounter = QueryPerformanceFrequency(&performanceFrequency);
  985. if (usePerformanceCounter) {
  986. QueryPerformanceCounter(&offset);
  987. frequencyToMicroseconds = (double)performanceFrequency.QuadPart / 1000000.;
  988. } else {
  989. offset = gettime_offset();
  990. frequencyToMicroseconds = 10.;
  991. }
  992. }
  993. if (usePerformanceCounter) {
  994. QueryPerformanceCounter(&t);
  995. } else {
  996. GetSystemTimeAsFileTime(&f);
  997. t.QuadPart = f.dwHighDateTime;
  998. t.QuadPart <<= 32;
  999. t.QuadPart |= f.dwLowDateTime;
  1000. }
  1001. t.QuadPart -= offset.QuadPart;
  1002. microseconds = (double)t.QuadPart / frequencyToMicroseconds;
  1003. t.QuadPart = (LONGLONG)microseconds;
  1004. tv->tv_sec = (long)(t.QuadPart / 1000000);
  1005. tv->tv_nsec = t.QuadPart % 1000000 * 1000;
  1006. return 0;
  1007. }
  1008. #elif __APPLE__ && (__MAC_OS_X_VERSION_MIN_REQUIRED < 101200 || __IPHONE_OS_VERSION_MIN_REQUIRED < 100000) && !defined(CLOCK_MONOTONIC)
  1009. #define CLOCK_MONOTONIC 0
  1010. int clock_gettime(int X, struct timespec* ts) {
  1011. clock_serv_t cclock;
  1012. mach_timespec_t mts;
  1013. host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
  1014. clock_get_time(cclock, &mts);
  1015. mach_port_deallocate(mach_task_self(), cclock);
  1016. ts->tv_sec = mts.tv_sec;
  1017. ts->tv_nsec = mts.tv_nsec;
  1018. return 0;
  1019. }
  1020. #endif
  1021. uint32_t enet_time_get(void) {
  1022. static uint64_t start_time_ns = 0;
  1023. struct timespec ts;
  1024. #ifdef CLOCK_MONOTONIC_RAW
  1025. clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
  1026. #else
  1027. clock_gettime(CLOCK_MONOTONIC, &ts);
  1028. #endif
  1029. static const uint64_t ns_in_s = 1000 * 1000 * 1000;
  1030. static const uint64_t ns_in_ms = 1000 * 1000;
  1031. uint64_t current_time_ns = ts.tv_nsec + (uint64_t)ts.tv_sec * ns_in_s;
  1032. uint64_t offset_ns = ENET_ATOMIC_READ(&start_time_ns);
  1033. if (offset_ns == 0) {
  1034. uint64_t want_value = current_time_ns - 1 * ns_in_ms;
  1035. uint64_t old_value = ENET_ATOMIC_CAS(&start_time_ns, 0, want_value);
  1036. offset_ns = old_value == 0 ? want_value : old_value;
  1037. }
  1038. uint64_t result_in_ns = current_time_ns - offset_ns;
  1039. return (uint32_t)(result_in_ns / ns_in_ms);
  1040. }
  1041. /*
  1042. =======================================================================
  1043. Checksum
  1044. =======================================================================
  1045. */
  1046. static const uint64_t crcTable[256] = {
  1047. UINT64_C(0x0000000000000000), UINT64_C(0x7ad870c830358979),
  1048. UINT64_C(0xf5b0e190606b12f2), UINT64_C(0x8f689158505e9b8b),
  1049. UINT64_C(0xc038e5739841b68f), UINT64_C(0xbae095bba8743ff6),
  1050. UINT64_C(0x358804e3f82aa47d), UINT64_C(0x4f50742bc81f2d04),
  1051. UINT64_C(0xab28ecb46814fe75), UINT64_C(0xd1f09c7c5821770c),
  1052. UINT64_C(0x5e980d24087fec87), UINT64_C(0x24407dec384a65fe),
  1053. UINT64_C(0x6b1009c7f05548fa), UINT64_C(0x11c8790fc060c183),
  1054. UINT64_C(0x9ea0e857903e5a08), UINT64_C(0xe478989fa00bd371),
  1055. UINT64_C(0x7d08ff3b88be6f81), UINT64_C(0x07d08ff3b88be6f8),
  1056. UINT64_C(0x88b81eabe8d57d73), UINT64_C(0xf2606e63d8e0f40a),
  1057. UINT64_C(0xbd301a4810ffd90e), UINT64_C(0xc7e86a8020ca5077),
  1058. UINT64_C(0x4880fbd87094cbfc), UINT64_C(0x32588b1040a14285),
  1059. UINT64_C(0xd620138fe0aa91f4), UINT64_C(0xacf86347d09f188d),
  1060. UINT64_C(0x2390f21f80c18306), UINT64_C(0x594882d7b0f40a7f),
  1061. UINT64_C(0x1618f6fc78eb277b), UINT64_C(0x6cc0863448deae02),
  1062. UINT64_C(0xe3a8176c18803589), UINT64_C(0x997067a428b5bcf0),
  1063. UINT64_C(0xfa11fe77117cdf02), UINT64_C(0x80c98ebf2149567b),
  1064. UINT64_C(0x0fa11fe77117cdf0), UINT64_C(0x75796f2f41224489),
  1065. UINT64_C(0x3a291b04893d698d), UINT64_C(0x40f16bccb908e0f4),
  1066. UINT64_C(0xcf99fa94e9567b7f), UINT64_C(0xb5418a5cd963f206),
  1067. UINT64_C(0x513912c379682177), UINT64_C(0x2be1620b495da80e),
  1068. UINT64_C(0xa489f35319033385), UINT64_C(0xde51839b2936bafc),
  1069. UINT64_C(0x9101f7b0e12997f8), UINT64_C(0xebd98778d11c1e81),
  1070. UINT64_C(0x64b116208142850a), UINT64_C(0x1e6966e8b1770c73),
  1071. UINT64_C(0x8719014c99c2b083), UINT64_C(0xfdc17184a9f739fa),
  1072. UINT64_C(0x72a9e0dcf9a9a271), UINT64_C(0x08719014c99c2b08),
  1073. UINT64_C(0x4721e43f0183060c), UINT64_C(0x3df994f731b68f75),
  1074. UINT64_C(0xb29105af61e814fe), UINT64_C(0xc849756751dd9d87),
  1075. UINT64_C(0x2c31edf8f1d64ef6), UINT64_C(0x56e99d30c1e3c78f),
  1076. UINT64_C(0xd9810c6891bd5c04), UINT64_C(0xa3597ca0a188d57d),
  1077. UINT64_C(0xec09088b6997f879), UINT64_C(0x96d1784359a27100),
  1078. UINT64_C(0x19b9e91b09fcea8b), UINT64_C(0x636199d339c963f2),
  1079. UINT64_C(0xdf7adabd7a6e2d6f), UINT64_C(0xa5a2aa754a5ba416),
  1080. UINT64_C(0x2aca3b2d1a053f9d), UINT64_C(0x50124be52a30b6e4),
  1081. UINT64_C(0x1f423fcee22f9be0), UINT64_C(0x659a4f06d21a1299),
  1082. UINT64_C(0xeaf2de5e82448912), UINT64_C(0x902aae96b271006b),
  1083. UINT64_C(0x74523609127ad31a), UINT64_C(0x0e8a46c1224f5a63),
  1084. UINT64_C(0x81e2d7997211c1e8), UINT64_C(0xfb3aa75142244891),
  1085. UINT64_C(0xb46ad37a8a3b6595), UINT64_C(0xceb2a3b2ba0eecec),
  1086. UINT64_C(0x41da32eaea507767), UINT64_C(0x3b024222da65fe1e),
  1087. UINT64_C(0xa2722586f2d042ee), UINT64_C(0xd8aa554ec2e5cb97),
  1088. UINT64_C(0x57c2c41692bb501c), UINT64_C(0x2d1ab4dea28ed965),
  1089. UINT64_C(0x624ac0f56a91f461), UINT64_C(0x1892b03d5aa47d18),
  1090. UINT64_C(0x97fa21650afae693), UINT64_C(0xed2251ad3acf6fea),
  1091. UINT64_C(0x095ac9329ac4bc9b), UINT64_C(0x7382b9faaaf135e2),
  1092. UINT64_C(0xfcea28a2faafae69), UINT64_C(0x8632586aca9a2710),
  1093. UINT64_C(0xc9622c4102850a14), UINT64_C(0xb3ba5c8932b0836d),
  1094. UINT64_C(0x3cd2cdd162ee18e6), UINT64_C(0x460abd1952db919f),
  1095. UINT64_C(0x256b24ca6b12f26d), UINT64_C(0x5fb354025b277b14),
  1096. UINT64_C(0xd0dbc55a0b79e09f), UINT64_C(0xaa03b5923b4c69e6),
  1097. UINT64_C(0xe553c1b9f35344e2), UINT64_C(0x9f8bb171c366cd9b),
  1098. UINT64_C(0x10e3202993385610), UINT64_C(0x6a3b50e1a30ddf69),
  1099. UINT64_C(0x8e43c87e03060c18), UINT64_C(0xf49bb8b633338561),
  1100. UINT64_C(0x7bf329ee636d1eea), UINT64_C(0x012b592653589793),
  1101. UINT64_C(0x4e7b2d0d9b47ba97), UINT64_C(0x34a35dc5ab7233ee),
  1102. UINT64_C(0xbbcbcc9dfb2ca865), UINT64_C(0xc113bc55cb19211c),
  1103. UINT64_C(0x5863dbf1e3ac9dec), UINT64_C(0x22bbab39d3991495),
  1104. UINT64_C(0xadd33a6183c78f1e), UINT64_C(0xd70b4aa9b3f20667),
  1105. UINT64_C(0x985b3e827bed2b63), UINT64_C(0xe2834e4a4bd8a21a),
  1106. UINT64_C(0x6debdf121b863991), UINT64_C(0x1733afda2bb3b0e8),
  1107. UINT64_C(0xf34b37458bb86399), UINT64_C(0x8993478dbb8deae0),
  1108. UINT64_C(0x06fbd6d5ebd3716b), UINT64_C(0x7c23a61ddbe6f812),
  1109. UINT64_C(0x3373d23613f9d516), UINT64_C(0x49aba2fe23cc5c6f),
  1110. UINT64_C(0xc6c333a67392c7e4), UINT64_C(0xbc1b436e43a74e9d),
  1111. UINT64_C(0x95ac9329ac4bc9b5), UINT64_C(0xef74e3e19c7e40cc),
  1112. UINT64_C(0x601c72b9cc20db47), UINT64_C(0x1ac40271fc15523e),
  1113. UINT64_C(0x5594765a340a7f3a), UINT64_C(0x2f4c0692043ff643),
  1114. UINT64_C(0xa02497ca54616dc8), UINT64_C(0xdafce7026454e4b1),
  1115. UINT64_C(0x3e847f9dc45f37c0), UINT64_C(0x445c0f55f46abeb9),
  1116. UINT64_C(0xcb349e0da4342532), UINT64_C(0xb1eceec59401ac4b),
  1117. UINT64_C(0xfebc9aee5c1e814f), UINT64_C(0x8464ea266c2b0836),
  1118. UINT64_C(0x0b0c7b7e3c7593bd), UINT64_C(0x71d40bb60c401ac4),
  1119. UINT64_C(0xe8a46c1224f5a634), UINT64_C(0x927c1cda14c02f4d),
  1120. UINT64_C(0x1d148d82449eb4c6), UINT64_C(0x67ccfd4a74ab3dbf),
  1121. UINT64_C(0x289c8961bcb410bb), UINT64_C(0x5244f9a98c8199c2),
  1122. UINT64_C(0xdd2c68f1dcdf0249), UINT64_C(0xa7f41839ecea8b30),
  1123. UINT64_C(0x438c80a64ce15841), UINT64_C(0x3954f06e7cd4d138),
  1124. UINT64_C(0xb63c61362c8a4ab3), UINT64_C(0xcce411fe1cbfc3ca),
  1125. UINT64_C(0x83b465d5d4a0eece), UINT64_C(0xf96c151de49567b7),
  1126. UINT64_C(0x76048445b4cbfc3c), UINT64_C(0x0cdcf48d84fe7545),
  1127. UINT64_C(0x6fbd6d5ebd3716b7), UINT64_C(0x15651d968d029fce),
  1128. UINT64_C(0x9a0d8ccedd5c0445), UINT64_C(0xe0d5fc06ed698d3c),
  1129. UINT64_C(0xaf85882d2576a038), UINT64_C(0xd55df8e515432941),
  1130. UINT64_C(0x5a3569bd451db2ca), UINT64_C(0x20ed197575283bb3),
  1131. UINT64_C(0xc49581ead523e8c2), UINT64_C(0xbe4df122e51661bb),
  1132. UINT64_C(0x3125607ab548fa30), UINT64_C(0x4bfd10b2857d7349),
  1133. UINT64_C(0x04ad64994d625e4d), UINT64_C(0x7e7514517d57d734),
  1134. UINT64_C(0xf11d85092d094cbf), UINT64_C(0x8bc5f5c11d3cc5c6),
  1135. UINT64_C(0x12b5926535897936), UINT64_C(0x686de2ad05bcf04f),
  1136. UINT64_C(0xe70573f555e26bc4), UINT64_C(0x9ddd033d65d7e2bd),
  1137. UINT64_C(0xd28d7716adc8cfb9), UINT64_C(0xa85507de9dfd46c0),
  1138. UINT64_C(0x273d9686cda3dd4b), UINT64_C(0x5de5e64efd965432),
  1139. UINT64_C(0xb99d7ed15d9d8743), UINT64_C(0xc3450e196da80e3a),
  1140. UINT64_C(0x4c2d9f413df695b1), UINT64_C(0x36f5ef890dc31cc8),
  1141. UINT64_C(0x79a59ba2c5dc31cc), UINT64_C(0x037deb6af5e9b8b5),
  1142. UINT64_C(0x8c157a32a5b7233e), UINT64_C(0xf6cd0afa9582aa47),
  1143. UINT64_C(0x4ad64994d625e4da), UINT64_C(0x300e395ce6106da3),
  1144. UINT64_C(0xbf66a804b64ef628), UINT64_C(0xc5bed8cc867b7f51),
  1145. UINT64_C(0x8aeeace74e645255), UINT64_C(0xf036dc2f7e51db2c),
  1146. UINT64_C(0x7f5e4d772e0f40a7), UINT64_C(0x05863dbf1e3ac9de),
  1147. UINT64_C(0xe1fea520be311aaf), UINT64_C(0x9b26d5e88e0493d6),
  1148. UINT64_C(0x144e44b0de5a085d), UINT64_C(0x6e963478ee6f8124),
  1149. UINT64_C(0x21c640532670ac20), UINT64_C(0x5b1e309b16452559),
  1150. UINT64_C(0xd476a1c3461bbed2), UINT64_C(0xaeaed10b762e37ab),
  1151. UINT64_C(0x37deb6af5e9b8b5b), UINT64_C(0x4d06c6676eae0222),
  1152. UINT64_C(0xc26e573f3ef099a9), UINT64_C(0xb8b627f70ec510d0),
  1153. UINT64_C(0xf7e653dcc6da3dd4), UINT64_C(0x8d3e2314f6efb4ad),
  1154. UINT64_C(0x0256b24ca6b12f26), UINT64_C(0x788ec2849684a65f),
  1155. UINT64_C(0x9cf65a1b368f752e), UINT64_C(0xe62e2ad306bafc57),
  1156. UINT64_C(0x6946bb8b56e467dc), UINT64_C(0x139ecb4366d1eea5),
  1157. UINT64_C(0x5ccebf68aecec3a1), UINT64_C(0x2616cfa09efb4ad8),
  1158. UINT64_C(0xa97e5ef8cea5d153), UINT64_C(0xd3a62e30fe90582a),
  1159. UINT64_C(0xb0c7b7e3c7593bd8), UINT64_C(0xca1fc72bf76cb2a1),
  1160. UINT64_C(0x45775673a732292a), UINT64_C(0x3faf26bb9707a053),
  1161. UINT64_C(0x70ff52905f188d57), UINT64_C(0x0a2722586f2d042e),
  1162. UINT64_C(0x854fb3003f739fa5), UINT64_C(0xff97c3c80f4616dc),
  1163. UINT64_C(0x1bef5b57af4dc5ad), UINT64_C(0x61372b9f9f784cd4),
  1164. UINT64_C(0xee5fbac7cf26d75f), UINT64_C(0x9487ca0fff135e26),
  1165. UINT64_C(0xdbd7be24370c7322), UINT64_C(0xa10fceec0739fa5b),
  1166. UINT64_C(0x2e675fb4576761d0), UINT64_C(0x54bf2f7c6752e8a9),
  1167. UINT64_C(0xcdcf48d84fe75459), UINT64_C(0xb71738107fd2dd20),
  1168. UINT64_C(0x387fa9482f8c46ab), UINT64_C(0x42a7d9801fb9cfd2),
  1169. UINT64_C(0x0df7adabd7a6e2d6), UINT64_C(0x772fdd63e7936baf),
  1170. UINT64_C(0xf8474c3bb7cdf024), UINT64_C(0x829f3cf387f8795d),
  1171. UINT64_C(0x66e7a46c27f3aa2c), UINT64_C(0x1c3fd4a417c62355),
  1172. UINT64_C(0x935745fc4798b8de), UINT64_C(0xe98f353477ad31a7),
  1173. UINT64_C(0xa6df411fbfb21ca3), UINT64_C(0xdc0731d78f8795da),
  1174. UINT64_C(0x536fa08fdfd90e51), UINT64_C(0x29b7d047efec8728),
  1175. };
  1176. uint64_t enet_crc64(const ENetBuffer* buffers, int bufferCount) {
  1177. uint64_t crc = 0xFFFFFFFFFFFFFFFF;
  1178. while (bufferCount-- > 0) {
  1179. const uint8_t* data = (const uint8_t*)buffers->data;
  1180. const uint8_t* dataEnd = &data[buffers->dataLength];
  1181. while (data < dataEnd) {
  1182. crc = (crc >> 8) ^ crcTable[(uint8_t)crc ^* data++];
  1183. }
  1184. ++buffers;
  1185. }
  1186. return ENET_HOST_TO_NET_64(~crc);
  1187. }
  1188. /*
  1189. =======================================================================
  1190. Packet
  1191. =======================================================================
  1192. */
  1193. ENetPacket* enet_packet_create(const void* data, size_t dataLength, uint32_t flags) {
  1194. ENetPacket* packet;
  1195. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1196. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1197. if (packet == NULL)
  1198. return NULL;
  1199. packet->data = (uint8_t*)data;
  1200. } else {
  1201. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength);
  1202. if (packet == NULL)
  1203. return NULL;
  1204. packet->data = (uint8_t*)packet + sizeof(ENetPacket);
  1205. if (data != NULL)
  1206. memcpy(packet->data, data, dataLength);
  1207. }
  1208. packet->referenceCount = 0;
  1209. packet->flags = flags;
  1210. packet->dataLength = dataLength;
  1211. packet->freeCallback = NULL;
  1212. packet->userData = NULL;
  1213. return packet;
  1214. }
  1215. ENetPacket* enet_packet_create_offset(const void* data, size_t dataLength, size_t dataOffset, uint32_t flags) {
  1216. ENetPacket* packet;
  1217. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1218. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1219. if (packet == NULL)
  1220. return NULL;
  1221. packet->data = (uint8_t*)data;
  1222. } else {
  1223. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength - dataOffset);
  1224. if (packet == NULL)
  1225. return NULL;
  1226. packet->data = (uint8_t*)packet + sizeof(ENetPacket);
  1227. if (data != NULL)
  1228. memcpy(packet->data, (char*)data + dataOffset, dataLength - dataOffset);
  1229. }
  1230. packet->referenceCount = 0;
  1231. packet->flags = flags;
  1232. packet->dataLength = dataLength - dataOffset;
  1233. packet->freeCallback = NULL;
  1234. packet->userData = NULL;
  1235. return packet;
  1236. }
  1237. void enet_packet_destroy(ENetPacket* packet) {
  1238. if (packet == NULL)
  1239. return;
  1240. if (packet->freeCallback != NULL)
  1241. (*packet->freeCallback)((void*)packet);
  1242. enet_free(packet);
  1243. }
  1244. /*
  1245. =======================================================================
  1246. Protocol
  1247. =======================================================================
  1248. */
  1249. static size_t commandSizes[ENET_PROTOCOL_COMMAND_COUNT] = {
  1250. 0,
  1251. sizeof(ENetProtocolAcknowledge),
  1252. sizeof(ENetProtocolConnect),
  1253. sizeof(ENetProtocolVerifyConnect),
  1254. sizeof(ENetProtocolDisconnect),
  1255. sizeof(ENetProtocolPing),
  1256. sizeof(ENetProtocolSendReliable),
  1257. sizeof(ENetProtocolSendUnreliable),
  1258. sizeof(ENetProtocolSendFragment),
  1259. sizeof(ENetProtocolSendUnsequenced),
  1260. sizeof(ENetProtocolBandwidthLimit),
  1261. sizeof(ENetProtocolThrottleConfigure),
  1262. sizeof(ENetProtocolSendFragment)
  1263. };
  1264. size_t enet_protocol_command_size(uint8_t commandNumber) {
  1265. return commandSizes[commandNumber & ENET_PROTOCOL_COMMAND_MASK];
  1266. }
  1267. static void enet_protocol_change_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1268. if (state == ENET_PEER_STATE_CONNECTED || state == ENET_PEER_STATE_DISCONNECT_LATER)
  1269. enet_peer_on_connect(peer);
  1270. else
  1271. enet_peer_on_disconnect(peer);
  1272. peer->state = state;
  1273. }
  1274. static void enet_protocol_dispatch_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1275. enet_protocol_change_state(host, peer, state);
  1276. if (!peer->needsDispatch) {
  1277. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1278. peer->needsDispatch = 1;
  1279. }
  1280. }
  1281. static int enet_protocol_dispatch_incoming_commands(ENetHost* host, ENetEvent* event) {
  1282. while (!enet_list_empty(&host->dispatchQueue)) {
  1283. ENetPeer* peer = (ENetPeer*)enet_list_remove(enet_list_begin(&host->dispatchQueue));
  1284. peer->needsDispatch = 0;
  1285. switch (peer->state) {
  1286. case ENET_PEER_STATE_CONNECTION_PENDING:
  1287. case ENET_PEER_STATE_CONNECTION_SUCCEEDED:
  1288. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1289. event->type = ENET_EVENT_TYPE_CONNECT;
  1290. event->peer = peer;
  1291. event->data = peer->eventData;
  1292. return 1;
  1293. case ENET_PEER_STATE_ZOMBIE:
  1294. host->recalculateBandwidthLimits = 1;
  1295. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1296. event->peer = peer;
  1297. event->data = peer->eventData;
  1298. enet_peer_reset(peer);
  1299. return 1;
  1300. case ENET_PEER_STATE_CONNECTED:
  1301. if (enet_list_empty(&peer->dispatchedCommands))
  1302. continue;
  1303. event->packet = enet_peer_receive(peer, &event->channelID);
  1304. if (event->packet == NULL)
  1305. continue;
  1306. event->type = ENET_EVENT_TYPE_RECEIVE;
  1307. event->peer = peer;
  1308. if (!enet_list_empty(&peer->dispatchedCommands)) {
  1309. peer->needsDispatch = 1;
  1310. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1311. }
  1312. return 1;
  1313. default:
  1314. break;
  1315. }
  1316. }
  1317. return 0;
  1318. }
  1319. static void enet_protocol_notify_connect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1320. host->recalculateBandwidthLimits = 1;
  1321. if (event != NULL) {
  1322. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1323. peer->totalDataSent = 0;
  1324. peer->totalDataReceived = 0;
  1325. peer->totalPacketsSent = 0;
  1326. peer->totalPacketsLost = 0;
  1327. event->type = ENET_EVENT_TYPE_CONNECT;
  1328. event->peer = peer;
  1329. event->data = peer->eventData;
  1330. } else {
  1331. enet_protocol_dispatch_state(host, peer, peer->state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING);
  1332. }
  1333. }
  1334. static void enet_protocol_notify_disconnect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1335. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1336. host->recalculateBandwidthLimits = 1;
  1337. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1338. enet_peer_reset(peer);
  1339. } else if (event != NULL) {
  1340. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1341. event->peer = peer;
  1342. event->data = 0;
  1343. enet_peer_reset(peer);
  1344. } else {
  1345. peer->eventData = 0;
  1346. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1347. }
  1348. }
  1349. static void enet_protocol_notify_disconnect_timeout(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1350. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1351. host->recalculateBandwidthLimits = 1;
  1352. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1353. enet_peer_reset(peer);
  1354. } else if (event != NULL) {
  1355. event->type = ENET_EVENT_TYPE_DISCONNECT_TIMEOUT;
  1356. event->peer = peer;
  1357. event->data = 0;
  1358. enet_peer_reset(peer);
  1359. } else {
  1360. peer->eventData = 0;
  1361. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1362. }
  1363. }
  1364. static void enet_protocol_remove_sent_unreliable_commands(ENetPeer* peer) {
  1365. ENetOutgoingCommand* outgoingCommand;
  1366. if (enet_list_empty(&peer->sentUnreliableCommands))
  1367. return;
  1368. do {
  1369. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentUnreliableCommands);
  1370. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1371. if (outgoingCommand->packet != NULL) {
  1372. --outgoingCommand->packet->referenceCount;
  1373. if (outgoingCommand->packet->referenceCount == 0) {
  1374. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1375. enet_packet_destroy(outgoingCommand->packet);
  1376. }
  1377. }
  1378. enet_free(outgoingCommand);
  1379. }
  1380. while (!enet_list_empty(&peer->sentUnreliableCommands));
  1381. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingCommands) && enet_list_empty(&peer->sentReliableCommands))
  1382. enet_peer_disconnect(peer, peer->eventData);
  1383. }
  1384. static ENetProtocolCommand enet_protocol_remove_sent_reliable_command(ENetPeer* peer, uint16_t reliableSequenceNumber, uint8_t channelID) {
  1385. ENetOutgoingCommand* outgoingCommand = NULL;
  1386. ENetListIterator currentCommand;
  1387. ENetProtocolCommand commandNumber;
  1388. int wasSent = 1;
  1389. for (currentCommand = enet_list_begin(&peer->sentReliableCommands); currentCommand != enet_list_end(&peer->sentReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1390. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1391. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1392. break;
  1393. }
  1394. if (currentCommand == enet_list_end(&peer->sentReliableCommands)) {
  1395. for (currentCommand = enet_list_begin(&peer->outgoingCommands); currentCommand != enet_list_end(&peer->outgoingCommands); currentCommand = enet_list_next(currentCommand)) {
  1396. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1397. if (outgoingCommand->sendAttempts < 1)
  1398. return ENET_PROTOCOL_COMMAND_NONE;
  1399. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1400. break;
  1401. }
  1402. if (currentCommand == enet_list_end(&peer->outgoingCommands))
  1403. return ENET_PROTOCOL_COMMAND_NONE;
  1404. wasSent = 0;
  1405. }
  1406. if (outgoingCommand == NULL)
  1407. return ENET_PROTOCOL_COMMAND_NONE;
  1408. if (channelID < peer->channelCount) {
  1409. ENetChannel* channel = &peer->channels[channelID];
  1410. uint16_t reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1411. if (channel->reliableWindows[reliableWindow] > 0) {
  1412. --channel->reliableWindows[reliableWindow];
  1413. if (!channel->reliableWindows[reliableWindow])
  1414. channel->usedReliableWindows &= ~(1 << reliableWindow);
  1415. }
  1416. }
  1417. commandNumber = (ENetProtocolCommand)(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK);
  1418. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1419. if (outgoingCommand->packet != NULL) {
  1420. if (wasSent)
  1421. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  1422. --outgoingCommand->packet->referenceCount;
  1423. if (outgoingCommand->packet->referenceCount == 0) {
  1424. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1425. enet_packet_destroy(outgoingCommand->packet);
  1426. }
  1427. }
  1428. enet_free(outgoingCommand);
  1429. if (enet_list_empty(&peer->sentReliableCommands))
  1430. return commandNumber;
  1431. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentReliableCommands);
  1432. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  1433. return commandNumber;
  1434. }
  1435. static ENetPeer* enet_protocol_handle_connect(ENetHost* host, ENetProtocolHeader* header, ENetProtocol* command) {
  1436. uint8_t incomingSessionID, outgoingSessionID;
  1437. uint32_t mtu, windowSize;
  1438. ENetChannel* channel;
  1439. size_t channelCount, duplicatePeers = 0;
  1440. ENetPeer* currentPeer, *peer = NULL;
  1441. ENetProtocol verifyCommand;
  1442. channelCount = ENET_NET_TO_HOST_32(command->connect.channelCount);
  1443. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  1444. return NULL;
  1445. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  1446. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED) {
  1447. if (peer == NULL)
  1448. peer = currentPeer;
  1449. } else if (currentPeer->state != ENET_PEER_STATE_CONNECTING && enet_in6_equal(currentPeer->address.ipv6, host->receivedAddress.ipv6)) {
  1450. if (currentPeer->address.port == host->receivedAddress.port && currentPeer->connectID == command->connect.connectID)
  1451. return NULL;
  1452. ++duplicatePeers;
  1453. }
  1454. }
  1455. if (peer == NULL || duplicatePeers >= host->duplicatePeers)
  1456. return NULL;
  1457. if (channelCount > host->channelLimit)
  1458. channelCount = host->channelLimit;
  1459. peer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  1460. if (peer->channels == NULL)
  1461. return NULL;
  1462. peer->channelCount = channelCount;
  1463. peer->state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
  1464. peer->connectID = command->connect.connectID;
  1465. peer->address = host->receivedAddress;
  1466. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->connect.outgoingPeerID);
  1467. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->connect.incomingBandwidth);
  1468. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->connect.outgoingBandwidth);
  1469. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->connect.packetThrottleInterval);
  1470. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleAcceleration);
  1471. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleDeceleration);
  1472. peer->eventData = ENET_NET_TO_HOST_32(command->connect.data);
  1473. incomingSessionID = command->connect.incomingSessionID == 0xFF ? peer->outgoingSessionID : command->connect.incomingSessionID;
  1474. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1475. if (incomingSessionID == peer->outgoingSessionID)
  1476. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1477. peer->outgoingSessionID = incomingSessionID;
  1478. outgoingSessionID = command->connect.outgoingSessionID == 0xFF ? peer->incomingSessionID : command->connect.outgoingSessionID;
  1479. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1480. if (outgoingSessionID == peer->incomingSessionID)
  1481. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1482. peer->incomingSessionID = outgoingSessionID;
  1483. for (channel = peer->channels; channel < &peer->channels[channelCount]; ++channel) {
  1484. channel->outgoingReliableSequenceNumber = 0;
  1485. channel->outgoingUnreliableSequenceNumber = 0;
  1486. channel->incomingReliableSequenceNumber = 0;
  1487. channel->incomingUnreliableSequenceNumber = 0;
  1488. enet_list_clear(&channel->incomingReliableCommands);
  1489. enet_list_clear(&channel->incomingUnreliableCommands);
  1490. channel->usedReliableWindows = 0;
  1491. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  1492. }
  1493. mtu = ENET_NET_TO_HOST_32(command->connect.mtu);
  1494. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1495. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1496. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1497. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1498. peer->mtu = mtu;
  1499. if (host->outgoingBandwidth == 0 && peer->incomingBandwidth == 0)
  1500. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1501. else if (host->outgoingBandwidth == 0 || peer->incomingBandwidth == 0)
  1502. peer->windowSize = (ENET_MAX(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1503. else
  1504. peer->windowSize = (ENET_MIN(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1505. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1506. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1507. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1508. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1509. if (host->incomingBandwidth == 0)
  1510. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1511. else
  1512. windowSize = (host->incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1513. if (windowSize > ENET_NET_TO_HOST_32(command->connect.windowSize))
  1514. windowSize = ENET_NET_TO_HOST_32(command->connect.windowSize);
  1515. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1516. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1517. else if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1518. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1519. verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  1520. verifyCommand.header.channelID = 0xFF;
  1521. verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16(peer->incomingPeerID);
  1522. verifyCommand.verifyConnect.incomingSessionID = incomingSessionID;
  1523. verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID;
  1524. verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_32(peer->mtu);
  1525. verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32(windowSize);
  1526. verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  1527. verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  1528. verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  1529. verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32(peer->packetThrottleInterval);
  1530. verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(peer->packetThrottleAcceleration);
  1531. verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(peer->packetThrottleDeceleration);
  1532. verifyCommand.verifyConnect.connectID = peer->connectID;
  1533. enet_peer_queue_outgoing_command(peer, &verifyCommand, NULL, 0, 0);
  1534. return peer;
  1535. }
  1536. static int enet_protocol_handle_send_reliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1537. size_t dataLength;
  1538. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1539. return -1;
  1540. dataLength = ENET_NET_TO_HOST_16(command->sendReliable.dataLength);
  1541. *currentData += dataLength;
  1542. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1543. return -1;
  1544. if (enet_peer_queue_incoming_command(peer, command, (const uint8_t*)command + sizeof(ENetProtocolSendReliable), dataLength, ENET_PACKET_FLAG_RELIABLE, 0) == NULL)
  1545. return -1;
  1546. return 0;
  1547. }
  1548. static int enet_protocol_handle_send_unsequenced(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1549. uint32_t unsequencedGroup, index;
  1550. size_t dataLength;
  1551. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1552. return -1;
  1553. dataLength = ENET_NET_TO_HOST_16(command->sendUnsequenced.dataLength);
  1554. *currentData += dataLength;
  1555. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1556. return -1;
  1557. unsequencedGroup = ENET_NET_TO_HOST_16(command->sendUnsequenced.unsequencedGroup);
  1558. index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
  1559. if (unsequencedGroup < peer->incomingUnsequencedGroup)
  1560. unsequencedGroup += 0x10000;
  1561. if (unsequencedGroup >= (uint32_t)peer->incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE)
  1562. return 0;
  1563. unsequencedGroup &= 0xFFFF;
  1564. if (unsequencedGroup - index != peer->incomingUnsequencedGroup) {
  1565. peer->incomingUnsequencedGroup = unsequencedGroup - index;
  1566. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  1567. } else if (peer->unsequencedWindow[index / 32] & (1 << (index % 32))) {
  1568. return 0;
  1569. }
  1570. if (enet_peer_queue_incoming_command(peer, command, (const uint8_t*)command + sizeof(ENetProtocolSendUnsequenced), dataLength, ENET_PACKET_FLAG_UNSEQUENCED, 0) == NULL)
  1571. return -1;
  1572. peer->unsequencedWindow[index / 32] |= 1 << (index % 32);
  1573. return 0;
  1574. }
  1575. static int enet_protocol_handle_send_unreliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1576. size_t dataLength;
  1577. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1578. return -1;
  1579. dataLength = ENET_NET_TO_HOST_16(command->sendUnreliable.dataLength);
  1580. *currentData += dataLength;
  1581. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1582. return -1;
  1583. if (enet_peer_queue_incoming_command(peer, command, (const uint8_t*)command + sizeof(ENetProtocolSendUnreliable), dataLength, 0, 0) == NULL)
  1584. return -1;
  1585. return 0;
  1586. }
  1587. static int enet_protocol_handle_send_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1588. uint32_t fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, startSequenceNumber, totalLength;
  1589. ENetChannel* channel;
  1590. uint16_t startWindow, currentWindow;
  1591. ENetListIterator currentCommand;
  1592. ENetIncomingCommand* startCommand = NULL;
  1593. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1594. return -1;
  1595. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1596. *currentData += fragmentLength;
  1597. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1598. return -1;
  1599. channel = &peer->channels[command->header.channelID];
  1600. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1601. startWindow = startSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1602. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1603. if (startSequenceNumber < channel->incomingReliableSequenceNumber)
  1604. startWindow += ENET_PEER_RELIABLE_WINDOWS;
  1605. if (startWindow < currentWindow || startWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1606. return 0;
  1607. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1608. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1609. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1610. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1611. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1612. return -1;
  1613. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1614. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1615. if (startSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1616. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1617. continue;
  1618. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1619. break;
  1620. }
  1621. if (incomingCommand->reliableSequenceNumber <= startSequenceNumber) {
  1622. if (incomingCommand->reliableSequenceNumber < startSequenceNumber)
  1623. break;
  1624. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1625. return -1;
  1626. startCommand = incomingCommand;
  1627. break;
  1628. }
  1629. }
  1630. if (startCommand == NULL) {
  1631. ENetProtocol hostCommand = *command;
  1632. hostCommand.header.reliableSequenceNumber = startSequenceNumber;
  1633. startCommand = enet_peer_queue_incoming_command(peer, &hostCommand, NULL, totalLength, ENET_PACKET_FLAG_RELIABLE, fragmentCount);
  1634. if (startCommand == NULL)
  1635. return -1;
  1636. }
  1637. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1638. --startCommand->fragmentsRemaining;
  1639. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1640. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1641. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1642. memcpy(startCommand->packet->data + fragmentOffset, (uint8_t*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1643. if (startCommand->fragmentsRemaining <= 0)
  1644. enet_peer_dispatch_incoming_reliable_commands(peer, channel, NULL);
  1645. }
  1646. return 0;
  1647. }
  1648. static int enet_protocol_handle_send_unreliable_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, uint8_t** currentData) {
  1649. uint32_t fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, reliableSequenceNumber, startSequenceNumber, totalLength;
  1650. uint16_t reliableWindow, currentWindow;
  1651. ENetChannel* channel;
  1652. ENetListIterator currentCommand;
  1653. ENetIncomingCommand* startCommand = NULL;
  1654. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER))
  1655. return -1;
  1656. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1657. *currentData += fragmentLength;
  1658. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength])
  1659. return -1;
  1660. channel = &peer->channels[command->header.channelID];
  1661. reliableSequenceNumber = command->header.reliableSequenceNumber;
  1662. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1663. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1664. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1665. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1666. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  1667. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1668. return 0;
  1669. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && startSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  1670. return 0;
  1671. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1672. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1673. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1674. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1675. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset)
  1676. return -1;
  1677. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1678. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1679. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1680. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1681. continue;
  1682. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1683. break;
  1684. }
  1685. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  1686. break;
  1687. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  1688. continue;
  1689. if (incomingCommand->unreliableSequenceNumber <= startSequenceNumber) {
  1690. if (incomingCommand->unreliableSequenceNumber < startSequenceNumber)
  1691. break;
  1692. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount)
  1693. return -1;
  1694. startCommand = incomingCommand;
  1695. break;
  1696. }
  1697. }
  1698. if (startCommand == NULL) {
  1699. startCommand = enet_peer_queue_incoming_command(peer, command, NULL, totalLength, ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED, fragmentCount);
  1700. if (startCommand == NULL)
  1701. return -1;
  1702. }
  1703. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1704. --startCommand->fragmentsRemaining;
  1705. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1706. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1707. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1708. memcpy(startCommand->packet->data + fragmentOffset, (uint8_t*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1709. if (startCommand->fragmentsRemaining <= 0)
  1710. enet_peer_dispatch_incoming_unreliable_commands(peer, channel, NULL);
  1711. }
  1712. return 0;
  1713. }
  1714. static int enet_protocol_handle_ping(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1715. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1716. return -1;
  1717. return 0;
  1718. }
  1719. static int enet_protocol_handle_bandwidth_limit(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1720. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1721. return -1;
  1722. if (peer->incomingBandwidth != 0)
  1723. --host->bandwidthLimitedPeers;
  1724. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.incomingBandwidth);
  1725. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.outgoingBandwidth);
  1726. if (peer->incomingBandwidth != 0)
  1727. ++host->bandwidthLimitedPeers;
  1728. if (peer->incomingBandwidth == 0 && host->outgoingBandwidth == 0)
  1729. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1730. else if (peer->incomingBandwidth == 0 || host->outgoingBandwidth == 0)
  1731. peer->windowSize = (ENET_MAX(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1732. else
  1733. peer->windowSize = (ENET_MIN(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1734. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1735. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1736. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1737. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1738. return 0;
  1739. }
  1740. static int enet_protocol_handle_throttle_configure(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1741. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  1742. return -1;
  1743. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleInterval);
  1744. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleAcceleration);
  1745. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleDeceleration);
  1746. return 0;
  1747. }
  1748. static int enet_protocol_handle_disconnect(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1749. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT)
  1750. return 0;
  1751. enet_peer_reset_queues(peer);
  1752. if (peer->state == ENET_PEER_STATE_CONNECTION_SUCCEEDED || peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_CONNECTING) {
  1753. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1754. } else if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1755. if (peer->state == ENET_PEER_STATE_CONNECTION_PENDING)
  1756. host->recalculateBandwidthLimits = 1;
  1757. enet_peer_reset(peer);
  1758. } else if (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  1759. enet_protocol_change_state(host, peer, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT);
  1760. } else {
  1761. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1762. }
  1763. if (peer->state != ENET_PEER_STATE_DISCONNECTED)
  1764. peer->eventData = ENET_NET_TO_HOST_32(command->disconnect.data);
  1765. return 0;
  1766. }
  1767. static int enet_protocol_handle_acknowledge(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1768. uint32_t roundTripTime, receivedSentTime, receivedReliableSequenceNumber;
  1769. ENetProtocolCommand commandNumber;
  1770. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE)
  1771. return 0;
  1772. receivedSentTime = ENET_NET_TO_HOST_16(command->acknowledge.receivedSentTime);
  1773. receivedSentTime |= host->serviceTime & 0xFFFF0000;
  1774. if ((receivedSentTime & 0x8000) > (host->serviceTime & 0x8000))
  1775. receivedSentTime -= 0x10000;
  1776. if (ENET_TIME_LESS(host->serviceTime, receivedSentTime))
  1777. return 0;
  1778. roundTripTime = ENET_TIME_DIFFERENCE(host->serviceTime, receivedSentTime);
  1779. if (roundTripTime == 0)
  1780. roundTripTime = 1;
  1781. enet_peer_throttle(peer, roundTripTime);
  1782. if (peer->lastReceiveTime > 0) {
  1783. if (roundTripTime >= peer->roundTripTime) {
  1784. uint32_t diff = roundTripTime - peer->roundTripTime;
  1785. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1786. peer->roundTripTimeVariance += diff / 4;
  1787. peer->roundTripTime += diff / 8;
  1788. } else {
  1789. uint32_t diff = peer->roundTripTime - roundTripTime;
  1790. if (diff <= peer->roundTripTimeVariance) {
  1791. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1792. peer->roundTripTimeVariance += diff / 4;
  1793. } else {
  1794. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 32;
  1795. peer->roundTripTimeVariance += diff / 32;
  1796. }
  1797. peer->roundTripTime -= diff / 8;
  1798. }
  1799. } else {
  1800. peer->roundTripTime = roundTripTime;
  1801. peer->roundTripTimeVariance = roundTripTime / 2;
  1802. }
  1803. if (peer->roundTripTime < peer->lowestRoundTripTime)
  1804. peer->lowestRoundTripTime = peer->roundTripTime;
  1805. if (peer->roundTripTimeVariance > peer->highestRoundTripTimeVariance)
  1806. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1807. if (peer->packetThrottleEpoch == 0 || ENET_TIME_DIFFERENCE(host->serviceTime, peer->packetThrottleEpoch) >= peer->packetThrottleInterval) {
  1808. peer->lastRoundTripTime = peer->lowestRoundTripTime;
  1809. peer->lastRoundTripTimeVariance = peer->highestRoundTripTimeVariance;
  1810. peer->lowestRoundTripTime = peer->roundTripTime;
  1811. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1812. peer->packetThrottleEpoch = host->serviceTime;
  1813. }
  1814. peer->lastReceiveTime = ENET_MAX(host->serviceTime, 1);
  1815. peer->earliestTimeout = 0;
  1816. receivedReliableSequenceNumber = ENET_NET_TO_HOST_16(command->acknowledge.receivedReliableSequenceNumber);
  1817. commandNumber = enet_protocol_remove_sent_reliable_command(peer, receivedReliableSequenceNumber, command->header.channelID);
  1818. switch (peer->state) {
  1819. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1820. if (commandNumber != ENET_PROTOCOL_COMMAND_VERIFY_CONNECT)
  1821. return -1;
  1822. enet_protocol_notify_connect(host, peer, event);
  1823. break;
  1824. case ENET_PEER_STATE_DISCONNECTING:
  1825. if (commandNumber != ENET_PROTOCOL_COMMAND_DISCONNECT)
  1826. return -1;
  1827. enet_protocol_notify_disconnect(host, peer, event);
  1828. break;
  1829. case ENET_PEER_STATE_DISCONNECT_LATER:
  1830. if (enet_list_empty(&peer->outgoingCommands) && enet_list_empty(&peer->sentReliableCommands))
  1831. enet_peer_disconnect(peer, peer->eventData);
  1832. break;
  1833. default:
  1834. break;
  1835. }
  1836. return 0;
  1837. }
  1838. static int enet_protocol_handle_verify_connect(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1839. uint32_t mtu, windowSize;
  1840. size_t channelCount;
  1841. if (peer->state != ENET_PEER_STATE_CONNECTING)
  1842. return 0;
  1843. channelCount = ENET_NET_TO_HOST_32(command->verifyConnect.channelCount);
  1844. 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) {
  1845. peer->eventData = 0;
  1846. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1847. return -1;
  1848. }
  1849. enet_protocol_remove_sent_reliable_command(peer, 1, 0xFF);
  1850. if (channelCount < peer->channelCount)
  1851. peer->channelCount = channelCount;
  1852. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->verifyConnect.outgoingPeerID);
  1853. peer->incomingSessionID = command->verifyConnect.incomingSessionID;
  1854. peer->outgoingSessionID = command->verifyConnect.outgoingSessionID;
  1855. mtu = ENET_NET_TO_HOST_32(command->verifyConnect.mtu);
  1856. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1857. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1858. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1859. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1860. if (mtu < peer->mtu)
  1861. peer->mtu = mtu;
  1862. windowSize = ENET_NET_TO_HOST_32(command->verifyConnect.windowSize);
  1863. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1864. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1865. if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1866. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1867. if (windowSize < peer->windowSize)
  1868. peer->windowSize = windowSize;
  1869. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.incomingBandwidth);
  1870. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.outgoingBandwidth);
  1871. enet_protocol_notify_connect(host, peer, event);
  1872. return 0;
  1873. }
  1874. static int enet_protocol_handle_incoming_commands(ENetHost* host, ENetEvent* event) {
  1875. ENetProtocolHeader* header;
  1876. ENetProtocol* command;
  1877. ENetPeer* peer;
  1878. uint8_t* currentData;
  1879. size_t headerSize;
  1880. uint16_t peerID, flags;
  1881. uint8_t sessionID;
  1882. if (host->receivedDataLength < (size_t)&((ENetProtocolHeader*)0)->sentTime)
  1883. return 0;
  1884. header = (ENetProtocolHeader*)host->receivedData;
  1885. peerID = ENET_NET_TO_HOST_16(header->peerID);
  1886. sessionID = (peerID & ENET_PROTOCOL_HEADER_SESSION_MASK) >> ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  1887. flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK;
  1888. peerID &= ~(ENET_PROTOCOL_HEADER_FLAG_MASK | ENET_PROTOCOL_HEADER_SESSION_MASK);
  1889. headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof(ENetProtocolHeader) : (size_t)&((ENetProtocolHeader*)0)->sentTime);
  1890. if (host->checksumCallback != NULL)
  1891. headerSize += sizeof(uint64_t);
  1892. if (peerID == ENET_PROTOCOL_MAXIMUM_PEER_ID) {
  1893. peer = NULL;
  1894. } else if (peerID >= host->peerCount) {
  1895. return 0;
  1896. } else {
  1897. peer = &host->peers[peerID];
  1898. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || ((!enet_in6_equal(host->receivedAddress.ipv6, peer->address.ipv6) || host->receivedAddress.port != peer->address.port) && peer->address.ipv4.ip.s_addr != INADDR_BROADCAST) || (peer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID && sessionID != peer->incomingSessionID))
  1899. return 0;
  1900. }
  1901. if (host->checksumCallback != NULL) {
  1902. uint64_t* checksum = (uint64_t*)&host->receivedData[headerSize - sizeof(uint64_t)];
  1903. uint64_t desiredChecksum = *checksum;
  1904. ENetBuffer buffer;
  1905. *checksum = peer != NULL ? peer->connectID : 0;
  1906. buffer.data = host->receivedData;
  1907. buffer.dataLength = host->receivedDataLength;
  1908. if (host->checksumCallback(&buffer, 1) != desiredChecksum)
  1909. return 0;
  1910. }
  1911. if (peer != NULL) {
  1912. peer->address.ipv6 = host->receivedAddress.ipv6;
  1913. peer->address.port = host->receivedAddress.port;
  1914. peer->incomingDataTotal += host->receivedDataLength;
  1915. peer->totalDataReceived += host->receivedDataLength;
  1916. }
  1917. currentData = host->receivedData + headerSize;
  1918. while (currentData < &host->receivedData[host->receivedDataLength]) {
  1919. uint8_t commandNumber;
  1920. size_t commandSize;
  1921. command = (ENetProtocol*)currentData;
  1922. if (currentData + sizeof(ENetProtocolCommandHeader) > &host->receivedData[host->receivedDataLength])
  1923. break;
  1924. commandNumber = command->header.command & ENET_PROTOCOL_COMMAND_MASK;
  1925. if (commandNumber >= ENET_PROTOCOL_COMMAND_COUNT)
  1926. break;
  1927. commandSize = commandSizes[commandNumber];
  1928. if (commandSize == 0 || currentData + commandSize > &host->receivedData[host->receivedDataLength])
  1929. break;
  1930. currentData += commandSize;
  1931. if (peer == NULL && (commandNumber != ENET_PROTOCOL_COMMAND_CONNECT || currentData < &host->receivedData[host->receivedDataLength]))
  1932. break;
  1933. command->header.reliableSequenceNumber = ENET_NET_TO_HOST_16(command->header.reliableSequenceNumber);
  1934. switch (commandNumber) {
  1935. case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE:
  1936. if (enet_protocol_handle_acknowledge(host, event, peer, command))
  1937. goto commandError;
  1938. break;
  1939. case ENET_PROTOCOL_COMMAND_CONNECT:
  1940. if (peer != NULL)
  1941. goto commandError;
  1942. if (host->preventConnections == 0) {
  1943. peer = enet_protocol_handle_connect(host, header, command);
  1944. if (peer == NULL)
  1945. goto commandError;
  1946. }
  1947. break;
  1948. case ENET_PROTOCOL_COMMAND_VERIFY_CONNECT:
  1949. if (enet_protocol_handle_verify_connect(host, event, peer, command))
  1950. goto commandError;
  1951. break;
  1952. case ENET_PROTOCOL_COMMAND_DISCONNECT:
  1953. if (enet_protocol_handle_disconnect(host, peer, command))
  1954. goto commandError;
  1955. break;
  1956. case ENET_PROTOCOL_COMMAND_PING:
  1957. if (enet_protocol_handle_ping(host, peer, command))
  1958. goto commandError;
  1959. break;
  1960. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  1961. if (enet_protocol_handle_send_reliable(host, peer, command, &currentData))
  1962. goto commandError;
  1963. break;
  1964. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  1965. if (enet_protocol_handle_send_unreliable(host, peer, command, &currentData))
  1966. goto commandError;
  1967. break;
  1968. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  1969. if (enet_protocol_handle_send_unsequenced(host, peer, command, &currentData))
  1970. goto commandError;
  1971. break;
  1972. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  1973. if (enet_protocol_handle_send_fragment(host, peer, command, &currentData))
  1974. goto commandError;
  1975. break;
  1976. case ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT:
  1977. if (enet_protocol_handle_bandwidth_limit(host, peer, command))
  1978. goto commandError;
  1979. break;
  1980. case ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE:
  1981. if (enet_protocol_handle_throttle_configure(host, peer, command))
  1982. goto commandError;
  1983. break;
  1984. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  1985. if (enet_protocol_handle_send_unreliable_fragment(host, peer, command, &currentData))
  1986. goto commandError;
  1987. break;
  1988. default:
  1989. goto commandError;
  1990. }
  1991. if (peer != NULL && (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0) {
  1992. uint16_t sentTime;
  1993. if (!(flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME))
  1994. break;
  1995. sentTime = ENET_NET_TO_HOST_16(header->sentTime);
  1996. switch (peer->state) {
  1997. case ENET_PEER_STATE_DISCONNECTING:
  1998. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1999. case ENET_PEER_STATE_DISCONNECTED:
  2000. case ENET_PEER_STATE_ZOMBIE:
  2001. break;
  2002. case ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT:
  2003. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2004. enet_peer_queue_acknowledgement(peer, command, sentTime);
  2005. break;
  2006. default:
  2007. enet_peer_queue_acknowledgement(peer, command, sentTime);
  2008. break;
  2009. }
  2010. }
  2011. }
  2012. commandError:
  2013. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2014. return 1;
  2015. return 0;
  2016. }
  2017. static int enet_protocol_receive_incoming_commands(ENetHost* host, ENetEvent* event) {
  2018. int packets;
  2019. for (packets = 0; packets < 256; ++packets) {
  2020. int receivedLength;
  2021. ENetBuffer buffer;
  2022. buffer.data = host->packetData[0];
  2023. buffer.dataLength = host->mtu;
  2024. receivedLength = enet_socket_receive(host->socket, &host->receivedAddress, &buffer, 1);
  2025. if (receivedLength == -2)
  2026. continue;
  2027. if (receivedLength < 0)
  2028. return -1;
  2029. if (receivedLength == 0)
  2030. return 0;
  2031. host->receivedData = host->packetData[0];
  2032. host->receivedDataLength = receivedLength;
  2033. host->totalReceivedData += receivedLength;
  2034. host->totalReceivedPackets++;
  2035. if (host->interceptCallback != NULL) {
  2036. switch (host->interceptCallback(event, &host->receivedAddress, host->receivedData, host->receivedDataLength)) {
  2037. case 1:
  2038. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2039. return 1;
  2040. continue;
  2041. case -1:
  2042. return -1;
  2043. default:
  2044. break;
  2045. }
  2046. }
  2047. switch (enet_protocol_handle_incoming_commands(host, event)) {
  2048. case 1:
  2049. return 1;
  2050. case -1:
  2051. return -1;
  2052. default:
  2053. break;
  2054. }
  2055. }
  2056. return 0;
  2057. }
  2058. static void enet_protocol_send_acknowledgements(ENetHost* host, ENetPeer* peer) {
  2059. ENetProtocol* command = &host->commands[host->commandCount];
  2060. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2061. ENetAcknowledgement* acknowledgement;
  2062. ENetListIterator currentAcknowledgement;
  2063. uint16_t reliableSequenceNumber;
  2064. currentAcknowledgement = enet_list_begin(&peer->acknowledgements);
  2065. while (currentAcknowledgement != enet_list_end(&peer->acknowledgements)) {
  2066. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < sizeof(ENetProtocolAcknowledge)) {
  2067. host->continueSending = 1;
  2068. break;
  2069. }
  2070. acknowledgement = (ENetAcknowledgement*)currentAcknowledgement;
  2071. currentAcknowledgement = enet_list_next(currentAcknowledgement);
  2072. buffer->data = command;
  2073. buffer->dataLength = sizeof(ENetProtocolAcknowledge);
  2074. host->packetSize += buffer->dataLength;
  2075. reliableSequenceNumber = ENET_HOST_TO_NET_16(acknowledgement->command.header.reliableSequenceNumber);
  2076. command->header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
  2077. command->header.channelID = acknowledgement->command.header.channelID;
  2078. command->header.reliableSequenceNumber = reliableSequenceNumber;
  2079. command->acknowledge.receivedReliableSequenceNumber = reliableSequenceNumber;
  2080. command->acknowledge.receivedSentTime = ENET_HOST_TO_NET_16(acknowledgement->sentTime);
  2081. if ((acknowledgement->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2082. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  2083. enet_list_remove(&acknowledgement->acknowledgementList);
  2084. enet_free(acknowledgement);
  2085. ++command;
  2086. ++buffer;
  2087. }
  2088. host->commandCount = command - host->commands;
  2089. host->bufferCount = buffer - host->buffers;
  2090. }
  2091. static int enet_protocol_check_timeouts(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  2092. ENetOutgoingCommand* outgoingCommand;
  2093. ENetListIterator currentCommand, insertPosition;
  2094. currentCommand = enet_list_begin(&peer->sentReliableCommands);
  2095. insertPosition = enet_list_begin(&peer->outgoingCommands);
  2096. while (currentCommand != enet_list_end(&peer->sentReliableCommands)) {
  2097. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2098. currentCommand = enet_list_next(currentCommand);
  2099. if (ENET_TIME_DIFFERENCE(host->serviceTime, outgoingCommand->sentTime) < outgoingCommand->roundTripTimeout)
  2100. continue;
  2101. if (peer->earliestTimeout == 0 || ENET_TIME_LESS(outgoingCommand->sentTime, peer->earliestTimeout))
  2102. peer->earliestTimeout = outgoingCommand->sentTime;
  2103. 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))) {
  2104. enet_protocol_notify_disconnect_timeout(host, peer, event);
  2105. return 1;
  2106. }
  2107. if (outgoingCommand->packet != NULL)
  2108. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  2109. ++peer->totalPacketsLost;
  2110. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2111. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2112. enet_list_insert(insertPosition, enet_list_remove(&outgoingCommand->outgoingCommandList));
  2113. if (currentCommand == enet_list_begin(&peer->sentReliableCommands) && !enet_list_empty(&peer->sentReliableCommands)) {
  2114. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2115. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  2116. }
  2117. }
  2118. return 0;
  2119. }
  2120. static int enet_protocol_check_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2121. ENetProtocol* command = &host->commands[host->commandCount];
  2122. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2123. ENetOutgoingCommand* outgoingCommand;
  2124. ENetListIterator currentCommand;
  2125. ENetChannel* channel;
  2126. uint16_t reliableWindow;
  2127. size_t commandSize;
  2128. int windowExceeded = 0, windowWrap = 0, canPing = 1;
  2129. currentCommand = enet_list_begin(&peer->outgoingCommands);
  2130. while (currentCommand != enet_list_end(&peer->outgoingCommands)) {
  2131. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2132. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2133. channel = outgoingCommand->command.header.channelID < peer->channelCount ? &peer->channels[outgoingCommand->command.header.channelID] : NULL;
  2134. reliableWindow = outgoingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2135. if (channel != NULL) {
  2136. 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)) - 1) << reliableWindow) | (((1 << (ENET_PEER_FREE_RELIABLE_WINDOWS + 1)) - 1) >> (ENET_PEER_RELIABLE_WINDOWS - reliableWindow)))))
  2137. windowWrap = 1;
  2138. if (windowWrap) {
  2139. currentCommand = enet_list_next(currentCommand);
  2140. continue;
  2141. }
  2142. }
  2143. if (outgoingCommand->packet != NULL) {
  2144. if (!windowExceeded) {
  2145. uint32_t windowSize = (peer->packetThrottle * peer->windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE;
  2146. if (peer->reliableDataInTransit + outgoingCommand->fragmentLength > ENET_MAX(windowSize, peer->mtu))
  2147. windowExceeded = 1;
  2148. }
  2149. if (windowExceeded) {
  2150. currentCommand = enet_list_next(currentCommand);
  2151. continue;
  2152. }
  2153. }
  2154. canPing = 0;
  2155. }
  2156. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2157. 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 && (uint16_t)(peer->mtu - host->packetSize) < (uint16_t)(commandSize + outgoingCommand->fragmentLength))) {
  2158. host->continueSending = 1;
  2159. break;
  2160. }
  2161. currentCommand = enet_list_next(currentCommand);
  2162. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2163. if (channel != NULL && outgoingCommand->sendAttempts < 1) {
  2164. channel->usedReliableWindows |= 1 << reliableWindow;
  2165. ++channel->reliableWindows[reliableWindow];
  2166. }
  2167. ++outgoingCommand->sendAttempts;
  2168. if (outgoingCommand->roundTripTimeout == 0) {
  2169. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2170. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2171. }
  2172. if (enet_list_empty(&peer->sentReliableCommands))
  2173. peer->nextTimeout = host->serviceTime + outgoingCommand->roundTripTimeout;
  2174. enet_list_insert(enet_list_end(&peer->sentReliableCommands),
  2175. enet_list_remove(&outgoingCommand->outgoingCommandList));
  2176. outgoingCommand->sentTime = host->serviceTime;
  2177. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_SENT_TIME;
  2178. peer->reliableDataInTransit += outgoingCommand->fragmentLength;
  2179. } else {
  2180. if (outgoingCommand->packet != NULL && outgoingCommand->fragmentOffset == 0 && !(outgoingCommand->packet->flags & (ENET_PACKET_FLAG_UNTHROTTLED))) {
  2181. peer->packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER;
  2182. peer->packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE;
  2183. if (peer->packetThrottleCounter > peer->packetThrottle) {
  2184. uint16_t reliableSequenceNumber = outgoingCommand->reliableSequenceNumber,
  2185. unreliableSequenceNumber = outgoingCommand->unreliableSequenceNumber;
  2186. for (;;) {
  2187. --outgoingCommand->packet->referenceCount;
  2188. if (outgoingCommand->packet->referenceCount == 0)
  2189. enet_packet_destroy(outgoingCommand->packet);
  2190. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2191. enet_free(outgoingCommand);
  2192. if (currentCommand == enet_list_end(&peer->outgoingCommands))
  2193. break;
  2194. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2195. if (outgoingCommand->reliableSequenceNumber != reliableSequenceNumber || outgoingCommand->unreliableSequenceNumber != unreliableSequenceNumber)
  2196. break;
  2197. currentCommand = enet_list_next(currentCommand);
  2198. }
  2199. continue;
  2200. }
  2201. }
  2202. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2203. if (outgoingCommand->packet != NULL)
  2204. enet_list_insert(enet_list_end(&peer->sentUnreliableCommands), outgoingCommand);
  2205. }
  2206. buffer->data = command;
  2207. buffer->dataLength = commandSize;
  2208. host->packetSize += buffer->dataLength;
  2209. *command = outgoingCommand->command;
  2210. if (outgoingCommand->packet != NULL) {
  2211. ++buffer;
  2212. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2213. buffer->dataLength = outgoingCommand->fragmentLength;
  2214. host->packetSize += outgoingCommand->fragmentLength;
  2215. } else if (!(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)) {
  2216. enet_free(outgoingCommand);
  2217. }
  2218. ++peer->totalPacketsSent;
  2219. ++command;
  2220. ++buffer;
  2221. }
  2222. host->commandCount = command - host->commands;
  2223. host->bufferCount = buffer - host->buffers;
  2224. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingCommands) && enet_list_empty(&peer->sentReliableCommands) && enet_list_empty(&peer->sentUnreliableCommands))
  2225. enet_peer_disconnect(peer, peer->eventData);
  2226. return canPing;
  2227. }
  2228. static int enet_protocol_send_outgoing_commands(ENetHost* host, ENetEvent* event, int checkForTimeouts) {
  2229. uint8_t headerData[sizeof(ENetProtocolHeader) + sizeof(uint32_t)];
  2230. ENetProtocolHeader* header = (ENetProtocolHeader*)headerData;
  2231. ENetPeer* currentPeer;
  2232. int sentLength;
  2233. host->continueSending = 1;
  2234. while (host->continueSending) {
  2235. for (host->continueSending = 0, currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2236. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED || currentPeer->state == ENET_PEER_STATE_ZOMBIE)
  2237. continue;
  2238. host->headerFlags = 0;
  2239. host->commandCount = 0;
  2240. host->bufferCount = 1;
  2241. host->packetSize = sizeof(ENetProtocolHeader);
  2242. if (!enet_list_empty(&currentPeer->acknowledgements))
  2243. enet_protocol_send_acknowledgements(host, currentPeer);
  2244. if (checkForTimeouts != 0 && !enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_GREATER_EQUAL(host->serviceTime, currentPeer->nextTimeout) && enet_protocol_check_timeouts(host, currentPeer, event) == 1) {
  2245. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2246. return 1;
  2247. else
  2248. continue;
  2249. }
  2250. if ((enet_list_empty(&currentPeer->outgoingCommands) || enet_protocol_check_outgoing_commands(host, currentPeer)) && enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->lastReceiveTime) >= currentPeer->pingInterval && currentPeer->mtu - host->packetSize >= sizeof(ENetProtocolPing)) {
  2251. enet_peer_ping(currentPeer);
  2252. enet_protocol_check_outgoing_commands(host, currentPeer);
  2253. }
  2254. if (host->commandCount == 0)
  2255. continue;
  2256. host->buffers->data = headerData;
  2257. if (host->headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME) {
  2258. header->sentTime = ENET_HOST_TO_NET_16(host->serviceTime & 0xFFFF);
  2259. host->buffers->dataLength = sizeof(ENetProtocolHeader);
  2260. } else {
  2261. host->buffers->dataLength = (size_t)&((ENetProtocolHeader*)0)->sentTime;
  2262. }
  2263. if (currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2264. host->headerFlags |= currentPeer->outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  2265. header->peerID = ENET_HOST_TO_NET_16(currentPeer->outgoingPeerID | host->headerFlags);
  2266. if (host->checksumCallback != NULL) {
  2267. uint64_t* checksum = (uint64_t*)&headerData[host->buffers->dataLength];
  2268. *checksum = currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer->connectID : 0;
  2269. host->buffers->dataLength += sizeof(uint64_t);
  2270. *checksum = host->checksumCallback(host->buffers, host->bufferCount);
  2271. }
  2272. currentPeer->lastSendTime = host->serviceTime;
  2273. sentLength = enet_socket_send(host->socket, &currentPeer->address, host->buffers, host->bufferCount);
  2274. enet_protocol_remove_sent_unreliable_commands(currentPeer);
  2275. if (sentLength < 0)
  2276. return -1;
  2277. host->totalSentData += sentLength;
  2278. currentPeer->totalDataSent += sentLength;
  2279. host->totalSentPackets++;
  2280. }
  2281. }
  2282. return 0;
  2283. }
  2284. void enet_host_flush(ENetHost* host) {
  2285. host->serviceTime = enet_time_get();
  2286. enet_protocol_send_outgoing_commands(host, NULL, 0);
  2287. }
  2288. int enet_host_check_events(ENetHost* host, ENetEvent* event) {
  2289. if (event == NULL)
  2290. return -1;
  2291. event->type = ENET_EVENT_TYPE_NONE;
  2292. event->peer = NULL;
  2293. event->packet = NULL;
  2294. return enet_protocol_dispatch_incoming_commands(host, event);
  2295. }
  2296. int enet_host_service(ENetHost* host, ENetEvent* event, uint32_t timeout) {
  2297. uint32_t waitCondition;
  2298. if (event != NULL) {
  2299. event->type = ENET_EVENT_TYPE_NONE;
  2300. event->peer = NULL;
  2301. event->packet = NULL;
  2302. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2303. case 1:
  2304. return 1;
  2305. case -1:
  2306. #ifdef ENET_DEBUG
  2307. perror("Error dispatching incoming packets");
  2308. #endif
  2309. return -1;
  2310. default:
  2311. break;
  2312. }
  2313. }
  2314. host->serviceTime = enet_time_get();
  2315. timeout += host->serviceTime;
  2316. do {
  2317. if (ENET_TIME_DIFFERENCE(host->serviceTime, host->bandwidthThrottleEpoch) >= ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  2318. enet_host_bandwidth_throttle(host);
  2319. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2320. case 1:
  2321. return 1;
  2322. case -1:
  2323. #ifdef ENET_DEBUG
  2324. perror("Error sending outgoing packets");
  2325. #endif
  2326. return -1;
  2327. default:
  2328. break;
  2329. }
  2330. switch (enet_protocol_receive_incoming_commands(host, event)) {
  2331. case 1:
  2332. return 1;
  2333. case -1:
  2334. #ifdef ENET_DEBUG
  2335. perror("Error receiving incoming packets");
  2336. #endif
  2337. return -1;
  2338. default:
  2339. break;
  2340. }
  2341. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2342. case 1:
  2343. return 1;
  2344. case -1:
  2345. #ifdef ENET_DEBUG
  2346. perror("Error sending outgoing packets");
  2347. #endif
  2348. return -1;
  2349. default:
  2350. break;
  2351. }
  2352. if (event != NULL) {
  2353. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2354. case 1:
  2355. return 1;
  2356. case -1:
  2357. #ifdef ENET_DEBUG
  2358. perror("Error dispatching incoming packets");
  2359. #endif
  2360. return -1;
  2361. default:
  2362. break;
  2363. }
  2364. }
  2365. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2366. return 0;
  2367. do {
  2368. host->serviceTime = enet_time_get();
  2369. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2370. return 0;
  2371. waitCondition = ENET_SOCKET_WAIT_RECEIVE | ENET_SOCKET_WAIT_INTERRUPT;
  2372. if (enet_socket_wait(host->socket, &waitCondition, ENET_TIME_DIFFERENCE(timeout, host->serviceTime)) != 0)
  2373. return -1;
  2374. }
  2375. while (waitCondition & ENET_SOCKET_WAIT_INTERRUPT);
  2376. host->serviceTime = enet_time_get();
  2377. }
  2378. while (waitCondition & ENET_SOCKET_WAIT_RECEIVE);
  2379. return 0;
  2380. }
  2381. /*
  2382. =======================================================================
  2383. Peer
  2384. =======================================================================
  2385. */
  2386. void enet_peer_throttle_configure(ENetPeer* peer, uint32_t interval, uint32_t acceleration, uint32_t deceleration, uint32_t threshold) {
  2387. ENetProtocol command;
  2388. peer->packetThrottleThreshold = threshold;
  2389. peer->packetThrottleInterval = interval;
  2390. peer->packetThrottleAcceleration = acceleration;
  2391. peer->packetThrottleDeceleration = deceleration;
  2392. command.header.command = ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2393. command.header.channelID = 0xFF;
  2394. command.throttleConfigure.packetThrottleInterval = ENET_HOST_TO_NET_32(interval);
  2395. command.throttleConfigure.packetThrottleAcceleration = ENET_HOST_TO_NET_32(acceleration);
  2396. command.throttleConfigure.packetThrottleDeceleration = ENET_HOST_TO_NET_32(deceleration);
  2397. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2398. }
  2399. int enet_peer_throttle(ENetPeer* peer, uint32_t rtt) {
  2400. if (peer->lastRoundTripTime <= peer->lastRoundTripTimeVariance) {
  2401. peer->packetThrottle = peer->packetThrottleLimit;
  2402. } else if (rtt < peer->lastRoundTripTime + (peer->lastRoundTripTimeVariance + 1) / 2) {
  2403. peer->packetThrottle += peer->packetThrottleAcceleration;
  2404. if (peer->packetThrottle > peer->packetThrottleLimit)
  2405. peer->packetThrottle = peer->packetThrottleLimit;
  2406. return 1;
  2407. } else if (rtt > peer->lastRoundTripTime + peer->packetThrottleThreshold + 2 * peer->lastRoundTripTimeVariance) {
  2408. if (peer->packetThrottle > peer->packetThrottleDeceleration)
  2409. peer->packetThrottle -= peer->packetThrottleDeceleration;
  2410. else
  2411. peer->packetThrottle = 0;
  2412. return -1;
  2413. }
  2414. return 0;
  2415. }
  2416. int enet_peer_send(ENetPeer* peer, uint8_t channelID, ENetPacket* packet) {
  2417. ENetChannel* channel = &peer->channels[channelID];
  2418. ENetProtocol command;
  2419. size_t fragmentLength;
  2420. if (peer->state != ENET_PEER_STATE_CONNECTED || channelID >= peer->channelCount || packet->dataLength > peer->host->maximumPacketSize)
  2421. return -1;
  2422. fragmentLength = peer->mtu - sizeof(ENetProtocolHeader) - sizeof(ENetProtocolSendFragment);
  2423. if (peer->host->checksumCallback != NULL)
  2424. fragmentLength -= sizeof(uint64_t);
  2425. if (packet->dataLength > fragmentLength) {
  2426. uint32_t fragmentCount = (packet->dataLength + fragmentLength - 1) / fragmentLength, fragmentNumber, fragmentOffset;
  2427. uint8_t commandNumber;
  2428. uint16_t startSequenceNumber;
  2429. ENetList fragments;
  2430. ENetOutgoingCommand* fragment;
  2431. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2432. return -1;
  2433. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED)) == ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED && channel->outgoingUnreliableSequenceNumber < 0xFFFF) {
  2434. commandNumber = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT;
  2435. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingUnreliableSequenceNumber + 1);
  2436. } else {
  2437. commandNumber = ENET_PROTOCOL_COMMAND_SEND_FRAGMENT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2438. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingReliableSequenceNumber + 1);
  2439. }
  2440. enet_list_clear(&fragments);
  2441. for (fragmentNumber = 0, fragmentOffset = 0; fragmentOffset < packet->dataLength; ++fragmentNumber, fragmentOffset += fragmentLength) {
  2442. if (packet->dataLength - fragmentOffset < fragmentLength)
  2443. fragmentLength = packet->dataLength - fragmentOffset;
  2444. fragment = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2445. if (fragment == NULL) {
  2446. while (!enet_list_empty(&fragments)) {
  2447. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2448. enet_free(fragment);
  2449. }
  2450. return -1;
  2451. }
  2452. fragment->fragmentOffset = fragmentOffset;
  2453. fragment->fragmentLength = fragmentLength;
  2454. fragment->packet = packet;
  2455. fragment->command.header.command = commandNumber;
  2456. fragment->command.header.channelID = channelID;
  2457. fragment->command.sendFragment.startSequenceNumber = startSequenceNumber;
  2458. fragment->command.sendFragment.dataLength = ENET_HOST_TO_NET_16(fragmentLength);
  2459. fragment->command.sendFragment.fragmentCount = ENET_HOST_TO_NET_32(fragmentCount);
  2460. fragment->command.sendFragment.fragmentNumber = ENET_HOST_TO_NET_32(fragmentNumber);
  2461. fragment->command.sendFragment.totalLength = ENET_HOST_TO_NET_32(packet->dataLength);
  2462. fragment->command.sendFragment.fragmentOffset = ENET_NET_TO_HOST_32(fragmentOffset);
  2463. enet_list_insert(enet_list_end(&fragments), fragment);
  2464. }
  2465. packet->referenceCount += fragmentNumber;
  2466. while (!enet_list_empty(&fragments)) {
  2467. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2468. enet_peer_setup_outgoing_command(peer, fragment);
  2469. }
  2470. return 0;
  2471. }
  2472. command.header.channelID = channelID;
  2473. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNSEQUENCED)) == ENET_PACKET_FLAG_UNSEQUENCED) {
  2474. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2475. command.sendUnsequenced.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2476. } else if (packet->flags & ENET_PACKET_FLAG_RELIABLE || channel->outgoingUnreliableSequenceNumber >= 0xFFFF) {
  2477. command.header.command = ENET_PROTOCOL_COMMAND_SEND_RELIABLE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2478. command.sendReliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2479. } else {
  2480. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE;
  2481. command.sendUnreliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2482. }
  2483. if (enet_peer_queue_outgoing_command(peer, &command, packet, 0, packet->dataLength) == NULL)
  2484. return -1;
  2485. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  2486. enet_host_flush(peer->host);
  2487. return 0;
  2488. }
  2489. ENetPacket* enet_peer_receive(ENetPeer* peer, uint8_t* channelID) {
  2490. ENetIncomingCommand* incomingCommand;
  2491. ENetPacket* packet;
  2492. if (enet_list_empty(&peer->dispatchedCommands))
  2493. return NULL;
  2494. incomingCommand = (ENetIncomingCommand*)enet_list_remove(enet_list_begin(&peer->dispatchedCommands));
  2495. if (channelID != NULL)
  2496. *channelID = incomingCommand->command.header.channelID;
  2497. packet = incomingCommand->packet;
  2498. --packet->referenceCount;
  2499. if (incomingCommand->fragments != NULL)
  2500. enet_free(incomingCommand->fragments);
  2501. enet_free(incomingCommand);
  2502. peer->totalWaitingData -= packet->dataLength;
  2503. return packet;
  2504. }
  2505. static void enet_peer_reset_outgoing_commands(ENetList* queue) {
  2506. ENetOutgoingCommand* outgoingCommand;
  2507. while (!enet_list_empty(queue)) {
  2508. outgoingCommand = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(queue));
  2509. if (outgoingCommand->packet != NULL) {
  2510. --outgoingCommand->packet->referenceCount;
  2511. if (outgoingCommand->packet->referenceCount == 0)
  2512. enet_packet_destroy(outgoingCommand->packet);
  2513. }
  2514. enet_free(outgoingCommand);
  2515. }
  2516. }
  2517. static void enet_peer_remove_incoming_commands(ENetList* queue, ENetListIterator startCommand, ENetListIterator endCommand, ENetIncomingCommand* excludeCommand) {
  2518. ENetListIterator currentCommand;
  2519. for (currentCommand = startCommand; currentCommand != endCommand;) {
  2520. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2521. currentCommand = enet_list_next(currentCommand);
  2522. if (incomingCommand == excludeCommand)
  2523. continue;
  2524. enet_list_remove(&incomingCommand->incomingCommandList);
  2525. if (incomingCommand->packet != NULL) {
  2526. --incomingCommand->packet->referenceCount;
  2527. if (incomingCommand->packet->referenceCount == 0)
  2528. enet_packet_destroy(incomingCommand->packet);
  2529. }
  2530. if (incomingCommand->fragments != NULL)
  2531. enet_free(incomingCommand->fragments);
  2532. enet_free(incomingCommand);
  2533. }
  2534. }
  2535. static void enet_peer_reset_incoming_commands(ENetList* queue) {
  2536. enet_peer_remove_incoming_commands(queue, enet_list_begin(queue), enet_list_end(queue), NULL);
  2537. }
  2538. void enet_peer_reset_queues(ENetPeer* peer) {
  2539. ENetChannel* channel;
  2540. if (peer->needsDispatch) {
  2541. enet_list_remove(&peer->dispatchList);
  2542. peer->needsDispatch = 0;
  2543. }
  2544. while (!enet_list_empty(&peer->acknowledgements)) {
  2545. enet_free(enet_list_remove(enet_list_begin(&peer->acknowledgements)));
  2546. }
  2547. enet_peer_reset_outgoing_commands(&peer->sentReliableCommands);
  2548. enet_peer_reset_outgoing_commands(&peer->sentUnreliableCommands);
  2549. enet_peer_reset_outgoing_commands(&peer->outgoingCommands);
  2550. enet_peer_reset_incoming_commands(&peer->dispatchedCommands);
  2551. if (peer->channels != NULL && peer->channelCount > 0) {
  2552. for (channel = peer->channels; channel < &peer->channels[peer->channelCount]; ++channel) {
  2553. enet_peer_reset_incoming_commands(&channel->incomingReliableCommands);
  2554. enet_peer_reset_incoming_commands(&channel->incomingUnreliableCommands);
  2555. }
  2556. enet_free(peer->channels);
  2557. }
  2558. peer->channels = NULL;
  2559. peer->channelCount = 0;
  2560. }
  2561. void enet_peer_on_connect(ENetPeer* peer) {
  2562. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  2563. if (peer->incomingBandwidth != 0)
  2564. ++peer->host->bandwidthLimitedPeers;
  2565. ++peer->host->connectedPeers;
  2566. }
  2567. }
  2568. void enet_peer_on_disconnect(ENetPeer* peer) {
  2569. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2570. if (peer->incomingBandwidth != 0)
  2571. --peer->host->bandwidthLimitedPeers;
  2572. --peer->host->connectedPeers;
  2573. }
  2574. }
  2575. void enet_peer_reset(ENetPeer* peer) {
  2576. enet_peer_on_disconnect(peer);
  2577. peer->outgoingPeerID = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  2578. peer->state = ENET_PEER_STATE_DISCONNECTED;
  2579. peer->incomingBandwidth = 0;
  2580. peer->outgoingBandwidth = 0;
  2581. peer->incomingBandwidthThrottleEpoch = 0;
  2582. peer->outgoingBandwidthThrottleEpoch = 0;
  2583. peer->incomingDataTotal = 0;
  2584. peer->totalDataReceived = 0;
  2585. peer->outgoingDataTotal = 0;
  2586. peer->totalDataSent = 0;
  2587. peer->lastSendTime = 0;
  2588. peer->lastReceiveTime = 0;
  2589. peer->nextTimeout = 0;
  2590. peer->earliestTimeout = 0;
  2591. peer->totalPacketsSent = 0;
  2592. peer->totalPacketsLost = 0;
  2593. peer->packetThrottle = ENET_PEER_DEFAULT_PACKET_THROTTLE;
  2594. peer->packetThrottleThreshold = ENET_PEER_PACKET_THROTTLE_THRESHOLD;
  2595. peer->packetThrottleLimit = ENET_PEER_PACKET_THROTTLE_SCALE;
  2596. peer->packetThrottleCounter = 0;
  2597. peer->packetThrottleEpoch = 0;
  2598. peer->packetThrottleAcceleration = ENET_PEER_PACKET_THROTTLE_ACCELERATION;
  2599. peer->packetThrottleDeceleration = ENET_PEER_PACKET_THROTTLE_DECELERATION;
  2600. peer->packetThrottleInterval = ENET_PEER_PACKET_THROTTLE_INTERVAL;
  2601. peer->pingInterval = ENET_PEER_PING_INTERVAL;
  2602. peer->timeoutLimit = ENET_PEER_TIMEOUT_LIMIT;
  2603. peer->timeoutMinimum = ENET_PEER_TIMEOUT_MINIMUM;
  2604. peer->timeoutMaximum = ENET_PEER_TIMEOUT_MAXIMUM;
  2605. peer->lastRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2606. peer->lowestRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2607. peer->lastRoundTripTimeVariance = 0;
  2608. peer->highestRoundTripTimeVariance = 0;
  2609. peer->roundTripTime = 1;
  2610. peer->roundTripTimeVariance = 0;
  2611. peer->mtu = peer->host->mtu;
  2612. peer->reliableDataInTransit = 0;
  2613. peer->outgoingReliableSequenceNumber = 0;
  2614. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  2615. peer->incomingUnsequencedGroup = 0;
  2616. peer->outgoingUnsequencedGroup = 0;
  2617. peer->eventData = 0;
  2618. peer->totalWaitingData = 0;
  2619. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  2620. enet_peer_reset_queues(peer);
  2621. }
  2622. void enet_peer_ping(ENetPeer* peer) {
  2623. ENetProtocol command;
  2624. if (peer->state != ENET_PEER_STATE_CONNECTED)
  2625. return;
  2626. command.header.command = ENET_PROTOCOL_COMMAND_PING | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2627. command.header.channelID = 0xFF;
  2628. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2629. }
  2630. void enet_peer_ping_interval(ENetPeer* peer, uint32_t pingInterval) {
  2631. peer->pingInterval = pingInterval ? pingInterval : ENET_PEER_PING_INTERVAL;
  2632. }
  2633. void enet_peer_timeout(ENetPeer* peer, uint32_t timeoutLimit, uint32_t timeoutMinimum, uint32_t timeoutMaximum) {
  2634. peer->timeoutLimit = timeoutLimit ? timeoutLimit : ENET_PEER_TIMEOUT_LIMIT;
  2635. peer->timeoutMinimum = timeoutMinimum ? timeoutMinimum : ENET_PEER_TIMEOUT_MINIMUM;
  2636. peer->timeoutMaximum = timeoutMaximum ? timeoutMaximum : ENET_PEER_TIMEOUT_MAXIMUM;
  2637. }
  2638. void enet_peer_disconnect_now(ENetPeer* peer, uint32_t data) {
  2639. ENetProtocol command;
  2640. if (peer->state == ENET_PEER_STATE_DISCONNECTED)
  2641. return;
  2642. if (peer->state != ENET_PEER_STATE_ZOMBIE && peer->state != ENET_PEER_STATE_DISCONNECTING) {
  2643. enet_peer_reset_queues(peer);
  2644. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2645. command.header.channelID = 0xFF;
  2646. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2647. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2648. enet_host_flush(peer->host);
  2649. }
  2650. enet_peer_reset(peer);
  2651. }
  2652. void enet_peer_disconnect(ENetPeer* peer, uint32_t data) {
  2653. ENetProtocol command;
  2654. 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)
  2655. return;
  2656. enet_peer_reset_queues(peer);
  2657. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT;
  2658. command.header.channelID = 0xFF;
  2659. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2660. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2661. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2662. else
  2663. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2664. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2665. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2666. enet_peer_on_disconnect(peer);
  2667. peer->state = ENET_PEER_STATE_DISCONNECTING;
  2668. } else {
  2669. enet_host_flush(peer->host);
  2670. enet_peer_reset(peer);
  2671. }
  2672. }
  2673. void enet_peer_disconnect_later(ENetPeer* peer, uint32_t data) {
  2674. if ((peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) && !(enet_list_empty(&peer->outgoingCommands) && enet_list_empty(&peer->sentReliableCommands))) {
  2675. peer->state = ENET_PEER_STATE_DISCONNECT_LATER;
  2676. peer->eventData = data;
  2677. } else {
  2678. enet_peer_disconnect(peer, data);
  2679. }
  2680. }
  2681. ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer* peer, const ENetProtocol* command, uint16_t sentTime) {
  2682. ENetAcknowledgement* acknowledgement;
  2683. if (command->header.channelID < peer->channelCount) {
  2684. ENetChannel* channel = &peer->channels[command->header.channelID];
  2685. uint16_t reliableWindow = command->header.reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2686. uint16_t currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2687. if (command->header.reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2688. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2689. if (reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1 && reliableWindow <= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS)
  2690. return NULL;
  2691. }
  2692. acknowledgement = (ENetAcknowledgement*)enet_malloc(sizeof(ENetAcknowledgement));
  2693. if (acknowledgement == NULL)
  2694. return NULL;
  2695. peer->outgoingDataTotal += sizeof(ENetProtocolAcknowledge);
  2696. acknowledgement->sentTime = sentTime;
  2697. acknowledgement->command = *command;
  2698. enet_list_insert(enet_list_end(&peer->acknowledgements), acknowledgement);
  2699. return acknowledgement;
  2700. }
  2701. void enet_peer_setup_outgoing_command(ENetPeer* peer, ENetOutgoingCommand* outgoingCommand) {
  2702. ENetChannel* channel = &peer->channels[outgoingCommand->command.header.channelID];
  2703. peer->outgoingDataTotal += enet_protocol_command_size(outgoingCommand->command.header.command) + outgoingCommand->fragmentLength;
  2704. if (outgoingCommand->command.header.channelID == 0xFF) {
  2705. ++peer->outgoingReliableSequenceNumber;
  2706. outgoingCommand->reliableSequenceNumber = peer->outgoingReliableSequenceNumber;
  2707. outgoingCommand->unreliableSequenceNumber = 0;
  2708. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2709. ++channel->outgoingReliableSequenceNumber;
  2710. channel->outgoingUnreliableSequenceNumber = 0;
  2711. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2712. outgoingCommand->unreliableSequenceNumber = 0;
  2713. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED) {
  2714. ++peer->outgoingUnsequencedGroup;
  2715. outgoingCommand->reliableSequenceNumber = 0;
  2716. outgoingCommand->unreliableSequenceNumber = 0;
  2717. } else {
  2718. if (outgoingCommand->fragmentOffset == 0)
  2719. ++channel->outgoingUnreliableSequenceNumber;
  2720. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2721. outgoingCommand->unreliableSequenceNumber = channel->outgoingUnreliableSequenceNumber;
  2722. }
  2723. outgoingCommand->sendAttempts = 0;
  2724. outgoingCommand->sentTime = 0;
  2725. outgoingCommand->roundTripTimeout = 0;
  2726. outgoingCommand->roundTripTimeoutLimit = 0;
  2727. outgoingCommand->command.header.reliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->reliableSequenceNumber);
  2728. switch (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2729. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2730. outgoingCommand->command.sendUnreliable.unreliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->unreliableSequenceNumber);
  2731. break;
  2732. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2733. outgoingCommand->command.sendUnsequenced.unsequencedGroup = ENET_HOST_TO_NET_16(peer->outgoingUnsequencedGroup);
  2734. break;
  2735. default:
  2736. break;
  2737. }
  2738. enet_list_insert(enet_list_end(&peer->outgoingCommands), outgoingCommand);
  2739. }
  2740. ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer* peer, const ENetProtocol* command, ENetPacket* packet, uint32_t offset, uint16_t length) {
  2741. ENetOutgoingCommand* outgoingCommand = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2742. if (outgoingCommand == NULL)
  2743. return NULL;
  2744. outgoingCommand->command = *command;
  2745. outgoingCommand->fragmentOffset = offset;
  2746. outgoingCommand->fragmentLength = length;
  2747. outgoingCommand->packet = packet;
  2748. if (packet != NULL)
  2749. ++packet->referenceCount;
  2750. enet_peer_setup_outgoing_command(peer, outgoingCommand);
  2751. return outgoingCommand;
  2752. }
  2753. void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer* peer, ENetChannel* channel, ENetIncomingCommand* queuedCommand) {
  2754. ENetListIterator droppedCommand, startCommand, currentCommand;
  2755. for (droppedCommand = startCommand = currentCommand = enet_list_begin(&channel->incomingUnreliableCommands); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2756. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2757. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2758. continue;
  2759. if (incomingCommand->reliableSequenceNumber == channel->incomingReliableSequenceNumber) {
  2760. if (incomingCommand->fragmentsRemaining <= 0) {
  2761. channel->incomingUnreliableSequenceNumber = incomingCommand->unreliableSequenceNumber;
  2762. continue;
  2763. }
  2764. if (startCommand != currentCommand) {
  2765. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2766. if (!peer->needsDispatch) {
  2767. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2768. peer->needsDispatch = 1;
  2769. }
  2770. droppedCommand = currentCommand;
  2771. } else if (droppedCommand != currentCommand) {
  2772. droppedCommand = enet_list_previous(currentCommand);
  2773. }
  2774. } else {
  2775. uint16_t reliableWindow = incomingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2776. uint16_t currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2777. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2778. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2779. if (reliableWindow >= currentWindow && reliableWindow < currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2780. break;
  2781. droppedCommand = enet_list_next(currentCommand);
  2782. if (startCommand != currentCommand) {
  2783. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2784. if (!peer->needsDispatch) {
  2785. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2786. peer->needsDispatch = 1;
  2787. }
  2788. }
  2789. }
  2790. startCommand = enet_list_next(currentCommand);
  2791. }
  2792. if (startCommand != currentCommand) {
  2793. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2794. if (!peer->needsDispatch) {
  2795. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2796. peer->needsDispatch = 1;
  2797. }
  2798. droppedCommand = currentCommand;
  2799. }
  2800. enet_peer_remove_incoming_commands(&channel->incomingUnreliableCommands, enet_list_begin(&channel->incomingUnreliableCommands), droppedCommand, queuedCommand);
  2801. }
  2802. void enet_peer_dispatch_incoming_reliable_commands(ENetPeer* peer, ENetChannel* channel, ENetIncomingCommand* queuedCommand) {
  2803. ENetListIterator currentCommand;
  2804. for (currentCommand = enet_list_begin(&channel->incomingReliableCommands); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2805. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2806. if (incomingCommand->fragmentsRemaining > 0 || incomingCommand->reliableSequenceNumber != (uint16_t)(channel->incomingReliableSequenceNumber + 1))
  2807. break;
  2808. channel->incomingReliableSequenceNumber = incomingCommand->reliableSequenceNumber;
  2809. if (incomingCommand->fragmentCount > 0)
  2810. channel->incomingReliableSequenceNumber += incomingCommand->fragmentCount - 1;
  2811. }
  2812. if (currentCommand == enet_list_begin(&channel->incomingReliableCommands))
  2813. return;
  2814. channel->incomingUnreliableSequenceNumber = 0;
  2815. enet_list_move(enet_list_end(&peer->dispatchedCommands), enet_list_begin(&channel->incomingReliableCommands), enet_list_previous(currentCommand));
  2816. if (!peer->needsDispatch) {
  2817. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2818. peer->needsDispatch = 1;
  2819. }
  2820. if (!enet_list_empty(&channel->incomingUnreliableCommands))
  2821. enet_peer_dispatch_incoming_unreliable_commands(peer, channel, queuedCommand);
  2822. }
  2823. ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer* peer, const ENetProtocol* command, const void* data, size_t dataLength, uint32_t flags, uint32_t fragmentCount) {
  2824. static ENetIncomingCommand dummyCommand;
  2825. ENetChannel* channel = &peer->channels[command->header.channelID];
  2826. uint32_t unreliableSequenceNumber = 0, reliableSequenceNumber = 0;
  2827. uint16_t reliableWindow, currentWindow;
  2828. ENetIncomingCommand* incomingCommand;
  2829. ENetListIterator currentCommand;
  2830. ENetPacket* packet = NULL;
  2831. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2832. goto discardCommand;
  2833. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) {
  2834. reliableSequenceNumber = command->header.reliableSequenceNumber;
  2835. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2836. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2837. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2838. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2839. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2840. goto discardCommand;
  2841. }
  2842. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2843. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2844. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2845. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber)
  2846. goto discardCommand;
  2847. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2848. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2849. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2850. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2851. continue;
  2852. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2853. break;
  2854. }
  2855. if (incomingCommand->reliableSequenceNumber <= reliableSequenceNumber) {
  2856. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2857. break;
  2858. goto discardCommand;
  2859. }
  2860. }
  2861. break;
  2862. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2863. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  2864. unreliableSequenceNumber = ENET_NET_TO_HOST_16(command->sendUnreliable.unreliableSequenceNumber);
  2865. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && unreliableSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  2866. goto discardCommand;
  2867. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2868. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2869. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2870. continue;
  2871. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2872. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2873. continue;
  2874. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2875. break;
  2876. }
  2877. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2878. break;
  2879. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  2880. continue;
  2881. if (incomingCommand->unreliableSequenceNumber <= unreliableSequenceNumber) {
  2882. if (incomingCommand->unreliableSequenceNumber < unreliableSequenceNumber)
  2883. break;
  2884. goto discardCommand;
  2885. }
  2886. }
  2887. break;
  2888. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2889. currentCommand = enet_list_end(&channel->incomingUnreliableCommands);
  2890. break;
  2891. default:
  2892. goto discardCommand;
  2893. }
  2894. if (peer->totalWaitingData >= peer->host->maximumWaitingData)
  2895. goto notifyError;
  2896. packet = enet_packet_create(data, dataLength, flags);
  2897. if (packet == NULL)
  2898. goto notifyError;
  2899. incomingCommand = (ENetIncomingCommand*)enet_malloc(sizeof(ENetIncomingCommand));
  2900. if (incomingCommand == NULL)
  2901. goto notifyError;
  2902. incomingCommand->reliableSequenceNumber = command->header.reliableSequenceNumber;
  2903. incomingCommand->unreliableSequenceNumber = unreliableSequenceNumber & 0xFFFF;
  2904. incomingCommand->command = *command;
  2905. incomingCommand->fragmentCount = fragmentCount;
  2906. incomingCommand->fragmentsRemaining = fragmentCount;
  2907. incomingCommand->packet = packet;
  2908. incomingCommand->fragments = NULL;
  2909. if (fragmentCount > 0) {
  2910. if (fragmentCount <= ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  2911. incomingCommand->fragments = (uint32_t*)enet_malloc((fragmentCount + 31) / 32 * sizeof(uint32_t));
  2912. if (incomingCommand->fragments == NULL) {
  2913. enet_free(incomingCommand);
  2914. goto notifyError;
  2915. }
  2916. memset(incomingCommand->fragments, 0, (fragmentCount + 31) / 32 * sizeof(uint32_t));
  2917. }
  2918. if (packet != NULL) {
  2919. ++packet->referenceCount;
  2920. peer->totalWaitingData += packet->dataLength;
  2921. }
  2922. enet_list_insert(enet_list_next(currentCommand), incomingCommand);
  2923. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2924. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2925. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2926. enet_peer_dispatch_incoming_reliable_commands(peer, channel, incomingCommand);
  2927. break;
  2928. default:
  2929. enet_peer_dispatch_incoming_unreliable_commands(peer, channel, incomingCommand);
  2930. break;
  2931. }
  2932. return incomingCommand;
  2933. discardCommand:
  2934. if (fragmentCount > 0)
  2935. goto notifyError;
  2936. if (packet != NULL && packet->referenceCount == 0)
  2937. enet_packet_destroy(packet);
  2938. return &dummyCommand;
  2939. notifyError:
  2940. if (packet != NULL && packet->referenceCount == 0)
  2941. enet_packet_destroy(packet);
  2942. return NULL;
  2943. }
  2944. /*
  2945. =======================================================================
  2946. Host
  2947. =======================================================================
  2948. */
  2949. ENetHost* enet_host_create(const ENetAddress* address, size_t peerCount, size_t channelLimit, uint32_t incomingBandwidth, uint32_t outgoingBandwidth, int bufferSize) {
  2950. ENetHost* host;
  2951. ENetPeer* currentPeer;
  2952. if (peerCount > ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2953. return NULL;
  2954. host = (ENetHost*)enet_malloc(sizeof(ENetHost));
  2955. if (host == NULL)
  2956. return NULL;
  2957. memset(host, 0, sizeof(ENetHost));
  2958. host->peers = (ENetPeer*)enet_malloc(peerCount * sizeof(ENetPeer));
  2959. if (host->peers == NULL) {
  2960. enet_free(host);
  2961. return NULL;
  2962. }
  2963. memset(host->peers, 0, peerCount * sizeof(ENetPeer));
  2964. host->socket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
  2965. if (host->socket != ENET_SOCKET_NULL)
  2966. enet_socket_set_option(host->socket, ENET_SOCKOPT_IPV6_V6ONLY, 0);
  2967. if (host->socket == ENET_SOCKET_NULL || (address != NULL && enet_socket_bind(host->socket, address) < 0)) {
  2968. if (host->socket != ENET_SOCKET_NULL)
  2969. enet_socket_destroy(host->socket);
  2970. enet_free(host->peers);
  2971. enet_free(host);
  2972. return NULL;
  2973. }
  2974. if (bufferSize > ENET_HOST_BUFFER_SIZE_MAX)
  2975. bufferSize = ENET_HOST_BUFFER_SIZE_MAX;
  2976. else if (bufferSize < ENET_HOST_BUFFER_SIZE_MIN)
  2977. bufferSize = ENET_HOST_BUFFER_SIZE_MIN;
  2978. enet_socket_set_option(host->socket, ENET_SOCKOPT_NONBLOCK, 1);
  2979. enet_socket_set_option(host->socket, ENET_SOCKOPT_BROADCAST, 1);
  2980. enet_socket_set_option(host->socket, ENET_SOCKOPT_RCVBUF, bufferSize);
  2981. enet_socket_set_option(host->socket, ENET_SOCKOPT_SNDBUF, bufferSize);
  2982. if (address != NULL && enet_socket_get_address(host->socket, &host->address) < 0)
  2983. host->address = *address;
  2984. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  2985. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  2986. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  2987. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  2988. host->randomSeed = (uint32_t)(size_t)host;
  2989. host->randomSeed += enet_host_random_seed();
  2990. host->randomSeed = (host->randomSeed << 16) | (host->randomSeed >> 16);
  2991. host->channelLimit = channelLimit;
  2992. host->incomingBandwidth = incomingBandwidth;
  2993. host->outgoingBandwidth = outgoingBandwidth;
  2994. host->bandwidthThrottleEpoch = 0;
  2995. host->recalculateBandwidthLimits = 0;
  2996. host->preventConnections = 0;
  2997. host->mtu = ENET_HOST_DEFAULT_MTU;
  2998. host->peerCount = peerCount;
  2999. host->commandCount = 0;
  3000. host->bufferCount = 0;
  3001. host->checksumCallback = NULL;
  3002. host->receivedAddress.ipv6 = ENET_HOST_ANY;
  3003. host->receivedAddress.port = 0;
  3004. host->receivedData = NULL;
  3005. host->receivedDataLength = 0;
  3006. host->totalSentData = 0;
  3007. host->totalSentPackets = 0;
  3008. host->totalReceivedData = 0;
  3009. host->totalReceivedPackets = 0;
  3010. host->connectedPeers = 0;
  3011. host->bandwidthLimitedPeers = 0;
  3012. host->duplicatePeers = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  3013. host->maximumPacketSize = ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE;
  3014. host->maximumWaitingData = ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA;
  3015. host->interceptCallback = NULL;
  3016. enet_list_clear(&host->dispatchQueue);
  3017. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3018. currentPeer->host = host;
  3019. currentPeer->incomingPeerID = currentPeer - host->peers;
  3020. currentPeer->outgoingSessionID = currentPeer->incomingSessionID = 0xFF;
  3021. currentPeer->data = NULL;
  3022. enet_list_clear(&currentPeer->acknowledgements);
  3023. enet_list_clear(&currentPeer->sentReliableCommands);
  3024. enet_list_clear(&currentPeer->sentUnreliableCommands);
  3025. enet_list_clear(&currentPeer->outgoingCommands);
  3026. enet_list_clear(&currentPeer->dispatchedCommands);
  3027. enet_peer_reset(currentPeer);
  3028. }
  3029. return host;
  3030. }
  3031. void enet_host_destroy(ENetHost* host) {
  3032. ENetPeer* currentPeer;
  3033. if (host == NULL)
  3034. return;
  3035. enet_socket_destroy(host->socket);
  3036. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3037. enet_peer_reset(currentPeer);
  3038. }
  3039. enet_free(host->peers);
  3040. enet_free(host);
  3041. }
  3042. void enet_host_prevent_connections(ENetHost* host, uint8_t state) {
  3043. if (host == NULL)
  3044. return;
  3045. host->preventConnections = state;
  3046. }
  3047. ENetPeer* enet_host_connect(ENetHost* host, const ENetAddress* address, size_t channelCount, uint32_t data) {
  3048. ENetPeer* currentPeer;
  3049. ENetChannel* channel;
  3050. ENetProtocol command;
  3051. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3052. channelCount = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3053. else if (channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3054. channelCount = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3055. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3056. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED)
  3057. break;
  3058. }
  3059. if (currentPeer >= &host->peers[host->peerCount])
  3060. return NULL;
  3061. currentPeer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  3062. if (currentPeer->channels == NULL)
  3063. return NULL;
  3064. currentPeer->channelCount = channelCount;
  3065. currentPeer->state = ENET_PEER_STATE_CONNECTING;
  3066. currentPeer->address = *address;
  3067. currentPeer->connectID = ++host->randomSeed;
  3068. if (host->outgoingBandwidth == 0)
  3069. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3070. else
  3071. currentPeer->windowSize = (host->outgoingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3072. if (currentPeer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  3073. currentPeer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3074. else if (currentPeer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  3075. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3076. for (channel = currentPeer->channels; channel < &currentPeer->channels[channelCount]; ++channel) {
  3077. channel->outgoingReliableSequenceNumber = 0;
  3078. channel->outgoingUnreliableSequenceNumber = 0;
  3079. channel->incomingReliableSequenceNumber = 0;
  3080. channel->incomingUnreliableSequenceNumber = 0;
  3081. enet_list_clear(&channel->incomingReliableCommands);
  3082. enet_list_clear(&channel->incomingUnreliableCommands);
  3083. channel->usedReliableWindows = 0;
  3084. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  3085. }
  3086. command.header.command = ENET_PROTOCOL_COMMAND_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3087. command.header.channelID = 0xFF;
  3088. command.connect.outgoingPeerID = ENET_HOST_TO_NET_16(currentPeer->incomingPeerID);
  3089. command.connect.incomingSessionID = currentPeer->incomingSessionID;
  3090. command.connect.outgoingSessionID = currentPeer->outgoingSessionID;
  3091. command.connect.mtu = ENET_HOST_TO_NET_32(currentPeer->mtu);
  3092. command.connect.windowSize = ENET_HOST_TO_NET_32(currentPeer->windowSize);
  3093. command.connect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  3094. command.connect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  3095. command.connect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3096. command.connect.packetThrottleInterval = ENET_HOST_TO_NET_32(currentPeer->packetThrottleInterval);
  3097. command.connect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleAcceleration);
  3098. command.connect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleDeceleration);
  3099. command.connect.connectID = currentPeer->connectID;
  3100. command.connect.data = ENET_HOST_TO_NET_32(data);
  3101. enet_peer_queue_outgoing_command(currentPeer, &command, NULL, 0, 0);
  3102. return currentPeer;
  3103. }
  3104. void enet_host_broadcast(ENetHost* host, uint8_t channelID, ENetPacket* packet) {
  3105. ENetPeer* currentPeer;
  3106. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3107. ++packet->referenceCount;
  3108. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3109. if (currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3110. continue;
  3111. enet_peer_send(currentPeer, channelID, packet);
  3112. }
  3113. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3114. --packet->referenceCount;
  3115. if (packet->referenceCount == 0)
  3116. enet_packet_destroy(packet);
  3117. }
  3118. void enet_host_broadcast_exclude(ENetHost* host, uint8_t channelID, ENetPacket* packet, ENetPeer* excludedPeer) {
  3119. ENetPeer* currentPeer;
  3120. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3121. ++packet->referenceCount;
  3122. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3123. if (currentPeer->state != ENET_PEER_STATE_CONNECTED || currentPeer == excludedPeer)
  3124. continue;
  3125. enet_peer_send(currentPeer, channelID, packet);
  3126. }
  3127. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3128. --packet->referenceCount;
  3129. if (packet->referenceCount == 0)
  3130. enet_packet_destroy(packet);
  3131. }
  3132. void enet_host_broadcast_selective(ENetHost* host, uint8_t channelID, ENetPacket* packet, ENetPeer** peers, size_t length) {
  3133. ENetPeer* currentPeer;
  3134. size_t i;
  3135. if (host == NULL)
  3136. return;
  3137. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3138. ++packet->referenceCount;
  3139. for (i = 0; i < length; i++) {
  3140. currentPeer = peers[i];
  3141. if (currentPeer == NULL || currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3142. continue;
  3143. enet_peer_send(currentPeer, channelID, packet);
  3144. }
  3145. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3146. --packet->referenceCount;
  3147. if (packet->referenceCount == 0)
  3148. enet_packet_destroy(packet);
  3149. }
  3150. void enet_host_channel_limit(ENetHost* host, size_t channelLimit) {
  3151. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3152. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3153. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3154. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3155. host->channelLimit = channelLimit;
  3156. }
  3157. void enet_host_bandwidth_limit(ENetHost* host, uint32_t incomingBandwidth, uint32_t outgoingBandwidth) {
  3158. host->incomingBandwidth = incomingBandwidth;
  3159. host->outgoingBandwidth = outgoingBandwidth;
  3160. host->recalculateBandwidthLimits = 1;
  3161. }
  3162. void enet_host_bandwidth_throttle(ENetHost* host) {
  3163. uint32_t timeCurrent = enet_time_get();
  3164. uint32_t elapsedTime = timeCurrent - host->bandwidthThrottleEpoch;
  3165. uint32_t peersRemaining = (uint32_t)host->connectedPeers;
  3166. uint32_t dataTotal = ~0;
  3167. uint32_t bandwidth = ~0;
  3168. uint32_t throttle = 0;
  3169. uint32_t bandwidthLimit = 0;
  3170. int needsAdjustment = host->bandwidthLimitedPeers > 0 ? 1 : 0;
  3171. ENetPeer* peer;
  3172. ENetProtocol command;
  3173. if (elapsedTime < ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  3174. return;
  3175. if (host->outgoingBandwidth == 0 && host->incomingBandwidth == 0)
  3176. return;
  3177. host->bandwidthThrottleEpoch = timeCurrent;
  3178. if (peersRemaining == 0)
  3179. return;
  3180. if (host->outgoingBandwidth != 0) {
  3181. dataTotal = 0;
  3182. bandwidth = (host->outgoingBandwidth * elapsedTime) / 1000;
  3183. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3184. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3185. continue;
  3186. dataTotal += peer->outgoingDataTotal;
  3187. }
  3188. }
  3189. while (peersRemaining > 0 && needsAdjustment != 0) {
  3190. needsAdjustment = 0;
  3191. if (dataTotal <= bandwidth)
  3192. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3193. else
  3194. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3195. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3196. uint32_t peerBandwidth;
  3197. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidth == 0 || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3198. continue;
  3199. peerBandwidth = (peer->incomingBandwidth * elapsedTime) / 1000;
  3200. if ((throttle * peer->outgoingDataTotal) / ENET_PEER_PACKET_THROTTLE_SCALE <= peerBandwidth)
  3201. continue;
  3202. peer->packetThrottleLimit = (peerBandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / peer->outgoingDataTotal;
  3203. if (peer->packetThrottleLimit == 0)
  3204. peer->packetThrottleLimit = 1;
  3205. if (peer->packetThrottle > peer->packetThrottleLimit)
  3206. peer->packetThrottle = peer->packetThrottleLimit;
  3207. peer->outgoingBandwidthThrottleEpoch = timeCurrent;
  3208. peer->incomingDataTotal = 0;
  3209. peer->outgoingDataTotal = 0;
  3210. needsAdjustment = 1;
  3211. --peersRemaining;
  3212. bandwidth -= peerBandwidth;
  3213. dataTotal -= peerBandwidth;
  3214. }
  3215. }
  3216. if (peersRemaining > 0) {
  3217. if (dataTotal <= bandwidth)
  3218. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3219. else
  3220. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3221. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3222. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3223. continue;
  3224. peer->packetThrottleLimit = throttle;
  3225. if (peer->packetThrottle > peer->packetThrottleLimit)
  3226. peer->packetThrottle = peer->packetThrottleLimit;
  3227. peer->incomingDataTotal = 0;
  3228. peer->outgoingDataTotal = 0;
  3229. }
  3230. }
  3231. if (host->recalculateBandwidthLimits) {
  3232. host->recalculateBandwidthLimits = 0;
  3233. peersRemaining = (uint32_t)host->connectedPeers;
  3234. bandwidth = host->incomingBandwidth;
  3235. needsAdjustment = 1;
  3236. if (bandwidth == 0) {
  3237. bandwidthLimit = 0;
  3238. } else {
  3239. while (peersRemaining > 0 && needsAdjustment != 0) {
  3240. needsAdjustment = 0;
  3241. bandwidthLimit = bandwidth / peersRemaining;
  3242. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3243. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3244. continue;
  3245. if (peer->outgoingBandwidth > 0 && peer->outgoingBandwidth >= bandwidthLimit)
  3246. continue;
  3247. peer->incomingBandwidthThrottleEpoch = timeCurrent;
  3248. needsAdjustment = 1;
  3249. --peersRemaining;
  3250. bandwidth -= peer->outgoingBandwidth;
  3251. }
  3252. }
  3253. }
  3254. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3255. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3256. continue;
  3257. command.header.command = ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3258. command.header.channelID = 0xFF;
  3259. command.bandwidthLimit.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3260. if (peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3261. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(peer->outgoingBandwidth);
  3262. else
  3263. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(bandwidthLimit);
  3264. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  3265. }
  3266. }
  3267. }
  3268. /*
  3269. =======================================================================
  3270. Address
  3271. =======================================================================
  3272. */
  3273. int enet_address_set_ip(ENetAddress* address, const char* ip) {
  3274. int type = AF_INET6;
  3275. void* destination = &address->ipv6;
  3276. if (strchr(ip, ':') == NULL) {
  3277. type = AF_INET;
  3278. memset(address, 0, sizeof(address->ipv4.zeros));
  3279. address->ipv4.ffff = 0xFFFF;
  3280. destination = &address->ipv4.ip;
  3281. }
  3282. if (!inet_pton(type, ip, destination))
  3283. return -1;
  3284. return 0;
  3285. }
  3286. int enet_address_set_hostname(ENetAddress* address, const char* name) {
  3287. struct addrinfo hints, *resultList = NULL, *result = NULL;
  3288. memset(&hints, 0, sizeof(hints));
  3289. hints.ai_family = AF_UNSPEC;
  3290. if (getaddrinfo(name, NULL, &hints, &resultList) != 0)
  3291. return -1;
  3292. for (result = resultList; result != NULL; result = result->ai_next) {
  3293. if (result->ai_addr != NULL && result->ai_addrlen >= sizeof(struct sockaddr_in)) {
  3294. if (result->ai_family == AF_INET) {
  3295. struct sockaddr_in* sin = (struct sockaddr_in*)result->ai_addr;
  3296. memset(address, 0, sizeof(address->ipv4.zeros));
  3297. address->ipv4.ffff = 0xFFFF;
  3298. address->ipv4.ip.s_addr = sin->sin_addr.s_addr;
  3299. freeaddrinfo(resultList);
  3300. return 0;
  3301. } else if (result->ai_family == AF_INET6) {
  3302. struct sockaddr_in6* sin = (struct sockaddr_in6*)result->ai_addr;
  3303. address->ipv6 = sin->sin6_addr;
  3304. freeaddrinfo(resultList);
  3305. return 0;
  3306. }
  3307. }
  3308. }
  3309. if (resultList != NULL)
  3310. freeaddrinfo(resultList);
  3311. return enet_address_set_ip(address, name);
  3312. }
  3313. int enet_address_get_ip(const ENetAddress* address, char* ip, size_t ipLength) {
  3314. if (address->ipv4.ffff == 0xFFFF && enet_array_is_zeroed(address->ipv4.zeros, sizeof(address->ipv4.zeros)) == 0) {
  3315. if (inet_ntop(AF_INET, &address->ipv4.ip, ip, ipLength) == NULL)
  3316. return -1;
  3317. } else if (inet_ntop(AF_INET6, &address->ipv6, ip, ipLength) == NULL) {
  3318. return -1;
  3319. }
  3320. return 0;
  3321. }
  3322. int enet_address_get_hostname(const ENetAddress* address, char* name, size_t nameLength) {
  3323. struct sockaddr_in6 sin;
  3324. int err;
  3325. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3326. sin.sin6_family = AF_INET6;
  3327. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3328. sin.sin6_addr = address->ipv6;
  3329. err = getnameinfo((struct sockaddr*)&sin, sizeof(sin), name, nameLength, NULL, 0, NI_NAMEREQD);
  3330. if (!err) {
  3331. if (name != NULL && nameLength > 0 && !memchr(name, '\0', nameLength))
  3332. return -1;
  3333. return 0;
  3334. }
  3335. if (err != EAI_NONAME)
  3336. return -1;
  3337. return enet_address_get_ip(address, name, nameLength);
  3338. }
  3339. /*
  3340. =======================================================================
  3341. Platform-specific (Unix)
  3342. =======================================================================
  3343. */
  3344. #ifndef _WIN32
  3345. int enet_initialize(void) {
  3346. return 0;
  3347. }
  3348. void enet_deinitialize(void) { }
  3349. uint64_t enet_host_random_seed(void) {
  3350. struct timeval timeVal;
  3351. gettimeofday(&timeVal, NULL);
  3352. return (timeVal.tv_sec * 1000) ^ (timeVal.tv_usec / 1000);
  3353. }
  3354. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3355. struct sockaddr_in6 sin;
  3356. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3357. sin.sin6_family = AF_INET6;
  3358. if (address != NULL) {
  3359. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3360. sin.sin6_addr = address->ipv6;
  3361. } else {
  3362. sin.sin6_port = 0;
  3363. sin.sin6_addr = ENET_HOST_ANY;
  3364. }
  3365. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3366. }
  3367. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3368. struct sockaddr_storage ss;
  3369. socklen_t saLength = sizeof(ss);
  3370. if (getsockname(socket, (struct sockaddr*)&ss, &saLength) == -1)
  3371. return -1;
  3372. if (ss.ss_family == AF_INET) {
  3373. struct sockaddr_in* sin = (struct sockaddr_in*)&ss;
  3374. memset(address, 0, sizeof(address->ipv4.zeros));
  3375. address->ipv4.ffff = 0xFFFF;
  3376. address->ipv4.ip = sin->sin_addr;
  3377. address->port = ENET_NET_TO_HOST_16(sin->sin_port);
  3378. } else if (ss.ss_family == AF_INET6) {
  3379. struct sockaddr_in6* sin = (struct sockaddr_in6*)&ss;
  3380. address->ipv6 = sin->sin6_addr;
  3381. address->port = ENET_NET_TO_HOST_16(sin->sin6_port);
  3382. }
  3383. return 0;
  3384. }
  3385. int enet_socket_listen(ENetSocket socket, int backlog) {
  3386. return listen(socket, backlog < 0 ? SOMAXCONN : backlog);
  3387. }
  3388. ENetSocket enet_socket_create(ENetSocketType type) {
  3389. int socketType = (type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM);
  3390. #ifdef SOCK_CLOEXEC
  3391. socketType |= SOCK_CLOEXEC;
  3392. #endif
  3393. return socket(PF_INET6, socketType, 0);
  3394. }
  3395. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3396. int result = -1;
  3397. switch (option) {
  3398. case ENET_SOCKOPT_NONBLOCK:
  3399. result = fcntl(socket, F_SETFL, (value ? O_NONBLOCK : 0) | (fcntl(socket, F_GETFL) & ~O_NONBLOCK));
  3400. break;
  3401. case ENET_SOCKOPT_BROADCAST:
  3402. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3403. break;
  3404. case ENET_SOCKOPT_REUSEADDR:
  3405. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3406. break;
  3407. case ENET_SOCKOPT_RCVBUF:
  3408. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3409. break;
  3410. case ENET_SOCKOPT_SNDBUF:
  3411. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3412. break;
  3413. case ENET_SOCKOPT_RCVTIMEO: {
  3414. struct timeval timeVal;
  3415. timeVal.tv_sec = value / 1000;
  3416. timeVal.tv_usec = (value % 1000) * 1000;
  3417. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3418. break;
  3419. }
  3420. case ENET_SOCKOPT_SNDTIMEO: {
  3421. struct timeval timeVal;
  3422. timeVal.tv_sec = value / 1000;
  3423. timeVal.tv_usec = (value % 1000) * 1000;
  3424. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3425. break;
  3426. }
  3427. case ENET_SOCKOPT_NODELAY:
  3428. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3429. break;
  3430. case ENET_SOCKOPT_IPV6_V6ONLY:
  3431. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3432. break;
  3433. default:
  3434. break;
  3435. }
  3436. return result == -1 ? -1 : 0;
  3437. }
  3438. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3439. int result = -1;
  3440. socklen_t len;
  3441. switch (option) {
  3442. case ENET_SOCKOPT_ERROR:
  3443. len = sizeof(int);
  3444. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, value, &len);
  3445. break;
  3446. default:
  3447. break;
  3448. }
  3449. return result == -1 ? -1 : 0;
  3450. }
  3451. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3452. int result = -1;
  3453. struct sockaddr_in6 sin;
  3454. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3455. sin.sin6_family = AF_INET6;
  3456. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3457. sin.sin6_addr = address->ipv6;
  3458. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3459. if (result == -1 && errno == EINPROGRESS)
  3460. return 0;
  3461. return result;
  3462. }
  3463. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3464. int result = -1;
  3465. struct sockaddr_in6 sin;
  3466. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3467. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3468. if (result == -1)
  3469. return ENET_SOCKET_NULL;
  3470. if (address != NULL) {
  3471. address->ipv6 = sin.sin6_addr;
  3472. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3473. }
  3474. return result;
  3475. }
  3476. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3477. return shutdown(socket, (int)how);
  3478. }
  3479. void enet_socket_destroy(ENetSocket socket) {
  3480. if (socket != ENET_SOCKET_NULL)
  3481. close(socket);
  3482. }
  3483. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3484. struct msghdr msgHdr;
  3485. struct sockaddr_in6 sin;
  3486. int sentLength;
  3487. memset(&msgHdr, 0, sizeof(struct msghdr));
  3488. if (address != NULL) {
  3489. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3490. sin.sin6_family = AF_INET6;
  3491. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3492. sin.sin6_addr = address->ipv6;
  3493. msgHdr.msg_name = &sin;
  3494. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3495. }
  3496. msgHdr.msg_iov = (struct iovec*)buffers;
  3497. msgHdr.msg_iovlen = bufferCount;
  3498. sentLength = sendmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3499. if (sentLength == -1) {
  3500. if (errno == EWOULDBLOCK)
  3501. return 0;
  3502. return -1;
  3503. }
  3504. return sentLength;
  3505. }
  3506. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3507. struct msghdr msgHdr;
  3508. struct sockaddr_in6 sin;
  3509. int recvLength;
  3510. memset(&msgHdr, 0, sizeof(struct msghdr));
  3511. if (address != NULL) {
  3512. msgHdr.msg_name = &sin;
  3513. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3514. }
  3515. msgHdr.msg_iov = (struct iovec*)buffers;
  3516. msgHdr.msg_iovlen = bufferCount;
  3517. recvLength = recvmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3518. if (recvLength == -1) {
  3519. if (errno == EWOULDBLOCK)
  3520. return 0;
  3521. return -1;
  3522. }
  3523. if (msgHdr.msg_flags & MSG_TRUNC)
  3524. return -2;
  3525. if (address != NULL) {
  3526. address->ipv6 = sin.sin6_addr;
  3527. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3528. }
  3529. return recvLength;
  3530. }
  3531. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, uint32_t timeout) {
  3532. struct timeval timeVal;
  3533. timeVal.tv_sec = timeout / 1000;
  3534. timeVal.tv_usec = (timeout % 1000) * 1000;
  3535. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3536. }
  3537. int enet_socket_wait(ENetSocket socket, uint32_t* condition, uint64_t timeout) {
  3538. struct pollfd pollSocket;
  3539. int pollCount;
  3540. pollSocket.fd = socket;
  3541. pollSocket.events = 0;
  3542. if (*condition & ENET_SOCKET_WAIT_SEND)
  3543. pollSocket.events |= POLLOUT;
  3544. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3545. pollSocket.events |= POLLIN;
  3546. pollCount = poll(&pollSocket, 1, timeout);
  3547. if (pollCount < 0) {
  3548. if (errno == EINTR && *condition & ENET_SOCKET_WAIT_INTERRUPT) {
  3549. *condition = ENET_SOCKET_WAIT_INTERRUPT;
  3550. return 0;
  3551. }
  3552. return -1;
  3553. }
  3554. *condition = ENET_SOCKET_WAIT_NONE;
  3555. if (pollCount == 0)
  3556. return 0;
  3557. if (pollSocket.revents & POLLOUT)
  3558. *condition |= ENET_SOCKET_WAIT_SEND;
  3559. if (pollSocket.revents & POLLIN)
  3560. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3561. return 0;
  3562. }
  3563. #endif
  3564. /*
  3565. =======================================================================
  3566. Platform-specific (Windows)
  3567. =======================================================================
  3568. */
  3569. #ifdef _WIN32
  3570. int enet_initialize(void) {
  3571. WORD versionRequested = MAKEWORD(2, 2);
  3572. WSADATA wsaData;
  3573. if (WSAStartup(versionRequested, &wsaData))
  3574. return -1;
  3575. if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
  3576. WSACleanup();
  3577. return -1;
  3578. }
  3579. timeBeginPeriod(1);
  3580. return 0;
  3581. }
  3582. void enet_deinitialize(void) {
  3583. timeEndPeriod(1);
  3584. WSACleanup();
  3585. }
  3586. uint64_t enet_host_random_seed(void) {
  3587. return (uint64_t)timeGetTime();
  3588. }
  3589. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3590. struct sockaddr_in6 sin;
  3591. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3592. sin.sin6_family = AF_INET6;
  3593. if (address != NULL) {
  3594. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3595. sin.sin6_addr = address->ipv6;
  3596. } else {
  3597. sin.sin6_port = 0;
  3598. sin.sin6_addr = in6addr_any;
  3599. }
  3600. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)) == SOCKET_ERROR ? -1 : 0;
  3601. }
  3602. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3603. struct sockaddr_storage ss;
  3604. int saLength = sizeof(ss);
  3605. if (getsockname(socket, (struct sockaddr*)&ss, &saLength) == -1)
  3606. return -1;
  3607. if (ss.ss_family == AF_INET) {
  3608. struct sockaddr_in* sin = (struct sockaddr_in*)&ss;
  3609. memset(address, 0, sizeof(address->ipv4.zeros));
  3610. address->ipv4.ffff = 0xFFFF;
  3611. address->ipv4.ip = sin->sin_addr;
  3612. address->port = ENET_NET_TO_HOST_16(sin->sin_port);
  3613. } else if (ss.ss_family == AF_INET6) {
  3614. struct sockaddr_in6* sin = (struct sockaddr_in6*)&ss;
  3615. address->ipv6 = sin->sin6_addr;
  3616. address->port = ENET_NET_TO_HOST_16(sin->sin6_port);
  3617. }
  3618. return 0;
  3619. }
  3620. int enet_socket_listen(ENetSocket socket, int backlog) {
  3621. return listen(socket, backlog < 0 ? SOMAXCONN : backlog) == SOCKET_ERROR ? -1 : 0;
  3622. }
  3623. ENetSocket enet_socket_create(ENetSocketType type) {
  3624. return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
  3625. }
  3626. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3627. int result = SOCKET_ERROR;
  3628. switch (option) {
  3629. case ENET_SOCKOPT_NONBLOCK: {
  3630. u_long nonBlocking = (u_long)value;
  3631. result = ioctlsocket(socket, FIONBIO, &nonBlocking);
  3632. break;
  3633. }
  3634. case ENET_SOCKOPT_BROADCAST:
  3635. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3636. break;
  3637. case ENET_SOCKOPT_REUSEADDR:
  3638. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3639. break;
  3640. case ENET_SOCKOPT_RCVBUF:
  3641. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3642. break;
  3643. case ENET_SOCKOPT_SNDBUF:
  3644. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3645. break;
  3646. case ENET_SOCKOPT_RCVTIMEO:
  3647. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&value, sizeof(int));
  3648. break;
  3649. case ENET_SOCKOPT_SNDTIMEO:
  3650. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&value, sizeof(int));
  3651. break;
  3652. case ENET_SOCKOPT_NODELAY:
  3653. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3654. break;
  3655. case ENET_SOCKOPT_IPV6_V6ONLY:
  3656. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3657. break;
  3658. default:
  3659. break;
  3660. }
  3661. return result == SOCKET_ERROR ? -1 : 0;
  3662. }
  3663. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3664. int result = SOCKET_ERROR, len;
  3665. switch (option) {
  3666. case ENET_SOCKOPT_ERROR:
  3667. len = sizeof(int);
  3668. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, (char*)value, &len);
  3669. break;
  3670. default:
  3671. break;
  3672. }
  3673. return result == SOCKET_ERROR ? -1 : 0;
  3674. }
  3675. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3676. int result = -1;
  3677. struct sockaddr_in6 sin;
  3678. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3679. sin.sin6_family = AF_INET6;
  3680. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3681. sin.sin6_addr = address->ipv6;
  3682. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3683. if (result == SOCKET_ERROR && WSAGetLastError() != WSAEWOULDBLOCK)
  3684. return -1;
  3685. return 0;
  3686. }
  3687. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3688. SOCKET result;
  3689. struct sockaddr_in6 sin;
  3690. int sinLength = sizeof(struct sockaddr_in6);
  3691. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3692. if (result == INVALID_SOCKET)
  3693. return ENET_SOCKET_NULL;
  3694. if (address != NULL) {
  3695. address->ipv6 = sin.sin6_addr;
  3696. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3697. }
  3698. return result;
  3699. }
  3700. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3701. return shutdown(socket, (int)how) == SOCKET_ERROR ? -1 : 0;
  3702. }
  3703. void enet_socket_destroy(ENetSocket socket) {
  3704. if (socket != INVALID_SOCKET)
  3705. closesocket(socket);
  3706. }
  3707. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3708. struct sockaddr_in6 sin;
  3709. DWORD sentLength = 0;
  3710. if (address != NULL) {
  3711. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3712. sin.sin6_family = AF_INET6;
  3713. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3714. sin.sin6_addr = address->ipv6;
  3715. }
  3716. 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)
  3717. return (WSAGetLastError() == WSAEWOULDBLOCK) ? 0 : -1;
  3718. return (int)sentLength;
  3719. }
  3720. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3721. INT sinLength = sizeof(struct sockaddr_in6);
  3722. DWORD flags = 0, recvLength = 0;
  3723. struct sockaddr_in6 sin;
  3724. if (WSARecvFrom(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &recvLength, &flags, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL, NULL, NULL) == SOCKET_ERROR) {
  3725. switch (WSAGetLastError()) {
  3726. case WSAEWOULDBLOCK:
  3727. case WSAECONNRESET:
  3728. return 0;
  3729. }
  3730. return -1;
  3731. }
  3732. if (flags & MSG_PARTIAL)
  3733. return -2;
  3734. if (address != NULL) {
  3735. address->ipv6 = sin.sin6_addr;
  3736. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3737. }
  3738. return (int)recvLength;
  3739. }
  3740. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, uint32_t timeout) {
  3741. struct timeval timeVal;
  3742. timeVal.tv_sec = timeout / 1000;
  3743. timeVal.tv_usec = (timeout % 1000) * 1000;
  3744. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3745. }
  3746. int enet_socket_wait(ENetSocket socket, uint32_t* condition, uint64_t timeout) {
  3747. fd_set readSet, writeSet;
  3748. struct timeval timeVal;
  3749. int selectCount;
  3750. timeVal.tv_sec = timeout / 1000;
  3751. timeVal.tv_usec = (timeout % 1000) * 1000;
  3752. FD_ZERO(&readSet);
  3753. FD_ZERO(&writeSet);
  3754. if (*condition & ENET_SOCKET_WAIT_SEND)
  3755. FD_SET(socket, &writeSet);
  3756. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3757. FD_SET(socket, &readSet);
  3758. selectCount = select(socket + 1, &readSet, &writeSet, NULL, &timeVal);
  3759. if (selectCount < 0)
  3760. return -1;
  3761. *condition = ENET_SOCKET_WAIT_NONE;
  3762. if (selectCount == 0)
  3763. return 0;
  3764. if (FD_ISSET(socket, &writeSet))
  3765. *condition |= ENET_SOCKET_WAIT_SEND;
  3766. if (FD_ISSET(socket, &readSet))
  3767. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3768. return 0;
  3769. }
  3770. #endif
  3771. /*
  3772. =======================================================================
  3773. Extended functionality
  3774. =======================================================================
  3775. */
  3776. void* enet_packet_get_data(const ENetPacket* packet) {
  3777. return (void*)packet->data;
  3778. }
  3779. void* enet_packet_get_user_data(const ENetPacket* packet) {
  3780. return packet->userData;
  3781. }
  3782. void enet_packet_set_user_data(ENetPacket* packet, void* userData) {
  3783. packet->userData = userData;
  3784. }
  3785. int enet_packet_get_length(const ENetPacket* packet) {
  3786. return packet->dataLength;
  3787. }
  3788. void enet_packet_set_free_callback(ENetPacket* packet, ENetPacketFreeCallback callback) {
  3789. packet->freeCallback = callback;
  3790. }
  3791. int enet_packet_check_references(const ENetPacket* packet) {
  3792. return (int)packet->referenceCount;
  3793. }
  3794. void enet_packet_dispose(ENetPacket* packet) {
  3795. if (packet->referenceCount == 0)
  3796. enet_packet_destroy(packet);
  3797. }
  3798. uint32_t enet_host_get_peers_count(const ENetHost* host) {
  3799. return host->connectedPeers;
  3800. }
  3801. uint32_t enet_host_get_packets_sent(const ENetHost* host) {
  3802. return host->totalSentPackets;
  3803. }
  3804. uint32_t enet_host_get_packets_received(const ENetHost* host) {
  3805. return host->totalReceivedPackets;
  3806. }
  3807. uint32_t enet_host_get_bytes_sent(const ENetHost* host) {
  3808. return host->totalSentData;
  3809. }
  3810. uint32_t enet_host_get_bytes_received(const ENetHost* host) {
  3811. return host->totalReceivedData;
  3812. }
  3813. void enet_host_set_max_duplicate_peers(ENetHost* host, uint16_t number) {
  3814. if (number < 1)
  3815. number = 1;
  3816. if (number > ENET_PROTOCOL_MAXIMUM_PEER_ID)
  3817. number = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  3818. host->duplicatePeers = number;
  3819. }
  3820. void enet_host_set_intercept_callback(ENetHost* host, ENetInterceptCallback callback) {
  3821. host->interceptCallback = callback;
  3822. }
  3823. void enet_host_set_checksum_callback(ENetHost* host, ENetChecksumCallback callback) {
  3824. host->checksumCallback = callback;
  3825. }
  3826. uint32_t enet_peer_get_id(const ENetPeer* peer) {
  3827. return peer->incomingPeerID;
  3828. }
  3829. int enet_peer_get_ip(const ENetPeer* peer, char* ip, size_t ipLength) {
  3830. return enet_address_get_ip(&peer->address, ip, ipLength);
  3831. }
  3832. uint16_t enet_peer_get_port(const ENetPeer* peer) {
  3833. return peer->address.port;
  3834. }
  3835. uint32_t enet_peer_get_mtu(const ENetPeer* peer) {
  3836. return peer->mtu;
  3837. }
  3838. ENetPeerState enet_peer_get_state(const ENetPeer* peer) {
  3839. return peer->state;
  3840. }
  3841. uint32_t enet_peer_get_rtt(const ENetPeer* peer) {
  3842. return peer->roundTripTime;
  3843. }
  3844. uint32_t enet_peer_get_last_rtt(const ENetPeer* peer) {
  3845. return peer->lastRoundTripTime;
  3846. }
  3847. uint32_t enet_peer_get_lastsendtime(const ENetPeer* peer) {
  3848. return peer->lastSendTime;
  3849. }
  3850. uint32_t enet_peer_get_lastreceivetime(const ENetPeer* peer) {
  3851. return peer->lastReceiveTime;
  3852. }
  3853. uint64_t enet_peer_get_packets_sent(const ENetPeer* peer) {
  3854. return peer->totalPacketsSent;
  3855. }
  3856. uint64_t enet_peer_get_packets_lost(const ENetPeer* peer) {
  3857. return peer->totalPacketsLost;
  3858. }
  3859. float enet_peer_get_packets_throttle(const ENetPeer* peer) {
  3860. return peer->packetThrottle / (float)ENET_PEER_PACKET_THROTTLE_SCALE * 100.0f;
  3861. }
  3862. uint64_t enet_peer_get_bytes_sent(const ENetPeer* peer) {
  3863. return peer->totalDataSent;
  3864. }
  3865. uint64_t enet_peer_get_bytes_received(const ENetPeer* peer) {
  3866. return peer->totalDataReceived;
  3867. }
  3868. void* enet_peer_get_data(const ENetPeer* peer) {
  3869. return (void*)peer->data;
  3870. }
  3871. void enet_peer_set_data(ENetPeer* peer, const void* data) {
  3872. peer->data = (uint32_t*)data;
  3873. }
  3874. #ifdef _MSC_VER
  3875. #pragma warning(pop)
  3876. #endif
  3877. #endif // ENET_IMPLEMENTATION
  3878. #endif // ENET_H