enet.h 178 KB

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  1. /*
  2. * ENet reliable UDP networking library
  3. * Improvements (c) SoftwareGuy (Coburn), c6burns
  4. * Original copyright (c) 2018 Lee Salzman, Vladyslav Hrytsenko, Dominik Madarász, Stanislav Denisov
  5. *
  6. * Permission is hereby granted, free of charge, to any person obtaining a copy
  7. * of this software and associated documentation files (the "Software"), to deal
  8. * in the Software without restriction, including without limitation the rights
  9. * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10. * copies of the Software, and to permit persons to whom the Software is
  11. * furnished to do so, subject to the following conditions:
  12. *
  13. * The above copyright notice and this permission notice shall be included in all
  14. * copies or substantial portions of the Software.
  15. *
  16. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19. * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22. * SOFTWARE.
  23. */
  24. #ifndef ENET_H
  25. #define ENET_H
  26. #include <stdbool.h>
  27. #include <stdint.h>
  28. #include <stdlib.h>
  29. #include <time.h>
  30. #include "enet_log.h"
  31. #define ENET_VERSION_MAJOR 2
  32. #define ENET_VERSION_MINOR 3
  33. #define ENET_VERSION_PATCH 0
  34. #define ENET_VERSION_CREATE(major, minor, patch) (((major) << 16) | ((minor) << 8) | (patch))
  35. #define ENET_VERSION_GET_MAJOR(version) (((version) >> 16) & 0xFF)
  36. #define ENET_VERSION_GET_MINOR(version) (((version) >> 8) & 0xFF)
  37. #define ENET_VERSION_GET_PATCH(version) ((version) & 0xFF)
  38. #define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH)
  39. #define ENET_TIME_OVERFLOW 86400000
  40. #define ENET_TIME_LESS(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW)
  41. #define ENET_TIME_GREATER(a, b) ((b) - (a) >= ENET_TIME_OVERFLOW)
  42. #define ENET_TIME_LESS_EQUAL(a, b) (!ENET_TIME_GREATER(a, b))
  43. #define ENET_TIME_GREATER_EQUAL(a, b) (!ENET_TIME_LESS(a, b))
  44. #define ENET_TIME_DIFFERENCE(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW ? (b) - (a) : (a) - (b))
  45. #define ENET_MAX(x, y) ((x) > (y) ? (x) : (y))
  46. #define ENET_MIN(x, y) ((x) < (y) ? (x) : (y))
  47. #define ENET_SRTT_INITIAL 1.0
  48. #define ENET_SRTT_PARA_G 0.125
  49. /*
  50. =======================================================================
  51. System differences
  52. =======================================================================
  53. */
  54. #ifdef _WIN32
  55. #if defined(_MSC_VER) && defined(ENET_IMPLEMENTATION)
  56. #pragma warning(disable: 4244) /* 64-bit to 32-bit integer conversion */
  57. #pragma warning(disable: 4267) /* size_t to integer conversion */
  58. #endif
  59. #ifndef ENET_NO_PRAGMA_LINK
  60. #pragma comment(lib, "ws2_32.lib")
  61. #pragma comment(lib, "winmm.lib")
  62. #endif
  63. #if _MSC_VER >= 1910
  64. /* It looks like there were changes as of Visual Studio 2017 and there are no 32/64 bit
  65. versions of _InterlockedExchange[operation], only InterlockedExchange[operation]
  66. (without leading underscore), so we have to distinguish between compiler versions */
  67. #define NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  68. #endif
  69. #ifdef __GNUC__
  70. #if (_WIN32_WINNT < 0x0501)
  71. #undef _WIN32_WINNT
  72. #define _WIN32_WINNT 0x0501
  73. #endif
  74. #endif
  75. #include <winsock2.h>
  76. #include <ws2tcpip.h>
  77. #include <mmsystem.h>
  78. #include <intrin.h>
  79. #if defined(_WIN32) && defined(_MSC_VER)
  80. #if _MSC_VER < 1900
  81. typedef struct timespec {
  82. long tv_sec;
  83. long tv_nsec;
  84. };
  85. #endif
  86. #define CLOCK_MONOTONIC 0
  87. #endif
  88. typedef SOCKET ENetSocket;
  89. #define ENET_SOCKET_NULL INVALID_SOCKET
  90. typedef struct {
  91. size_t dataLength;
  92. void* data;
  93. } ENetBuffer;
  94. #define ENET_CALLBACK __cdecl
  95. #ifdef ENET_DLL
  96. #ifdef ENET_IMPLEMENTATION
  97. #define ENET_API __declspec(dllexport)
  98. #else
  99. #define ENET_API __declspec(dllimport)
  100. #endif
  101. #else
  102. #define ENET_API extern
  103. #endif
  104. #else
  105. #include <sys/types.h>
  106. #include <sys/ioctl.h>
  107. #include <sys/time.h>
  108. #include <sys/socket.h>
  109. #include <poll.h>
  110. #include <arpa/inet.h>
  111. #include <netinet/in.h>
  112. #include <netinet/tcp.h>
  113. #include <netdb.h>
  114. #include <unistd.h>
  115. #include <string.h>
  116. #include <errno.h>
  117. #include <fcntl.h>
  118. #ifdef __APPLE__
  119. #include <mach/clock.h>
  120. #include <mach/mach.h>
  121. #include <Availability.h>
  122. #endif
  123. #ifndef MSG_NOSIGNAL
  124. #define MSG_NOSIGNAL 0
  125. #endif
  126. #ifdef MSG_MAXIOVLEN
  127. #define ENET_BUFFER_MAXIMUM MSG_MAXIOVLEN
  128. #endif
  129. typedef int ENetSocket;
  130. #define ENET_SOCKET_NULL -1
  131. typedef struct {
  132. void* data;
  133. size_t dataLength;
  134. } ENetBuffer;
  135. #define ENET_CALLBACK
  136. #define ENET_API extern
  137. #endif
  138. #ifndef ENET_BUFFER_MAXIMUM
  139. #define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS)
  140. #endif
  141. #define ENET_HOST_ANY in6addr_any
  142. #define ENET_PORT_ANY 0
  143. #define ENET_HOST_SIZE 1025
  144. #define ENET_HOST_TO_NET_16(value) (htons(value))
  145. #define ENET_HOST_TO_NET_32(value) (htonl(value))
  146. #define ENET_NET_TO_HOST_16(value) (ntohs(value))
  147. #define ENET_NET_TO_HOST_32(value) (ntohl(value))
  148. #ifdef __cplusplus
  149. extern "C" {
  150. #endif
  151. /*
  152. =======================================================================
  153. Internals
  154. =======================================================================
  155. */
  156. typedef uint8_t enet_uint8;
  157. typedef uint16_t enet_uint16;
  158. typedef uint32_t enet_uint32;
  159. typedef uint64_t enet_uint64;
  160. typedef enet_uint32 ENetVersion;
  161. typedef fd_set ENetSocketSet;
  162. typedef struct _ENetCallbacks {
  163. void* (ENET_CALLBACK *malloc)(size_t size);
  164. void (ENET_CALLBACK *free)(void* memory);
  165. void (ENET_CALLBACK *noMemory)(void);
  166. } ENetCallbacks;
  167. extern void* enet_malloc(size_t);
  168. extern void enet_free(void*);
  169. typedef struct _ENetListNode {
  170. struct _ENetListNode* next;
  171. struct _ENetListNode* previous;
  172. } ENetListNode;
  173. typedef ENetListNode* ENetListIterator;
  174. typedef struct _ENetList {
  175. ENetListNode sentinel;
  176. } ENetList;
  177. extern ENetListIterator enet_list_insert(ENetListIterator, void*);
  178. extern ENetListIterator enet_list_move(ENetListIterator, void*, void*);
  179. extern void* enet_list_remove(ENetListIterator);
  180. extern void enet_list_clear(ENetList*);
  181. extern size_t enet_list_size(ENetList*);
  182. #define enet_list_begin(list) ((list)->sentinel.next)
  183. #define enet_list_end(list) (&(list)->sentinel)
  184. #define enet_list_empty(list) (enet_list_begin(list) == enet_list_end(list))
  185. #define enet_list_next(iterator) ((iterator)->next)
  186. #define enet_list_previous(iterator) ((iterator)->previous)
  187. #define enet_list_front(list) ((void*)(list)->sentinel.next)
  188. #define enet_list_back(list) ((void*)(list)->sentinel.previous)
  189. #ifndef IN4ADDR
  190. #define IN4ADDR
  191. struct in4_addr {
  192. uint8_t zeros[10];
  193. uint16_t ffff;
  194. struct in_addr ip;
  195. };
  196. #endif
  197. /*
  198. =======================================================================
  199. Protocol
  200. =======================================================================
  201. */
  202. enum {
  203. ENET_PROTOCOL_MINIMUM_MTU = 576,
  204. ENET_PROTOCOL_MAXIMUM_MTU = 4096,
  205. ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS = 32,
  206. ENET_PROTOCOL_MINIMUM_WINDOW_SIZE = 4096,
  207. ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE = 65536,
  208. ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT = 1,
  209. ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT = 255,
  210. ENET_PROTOCOL_MAXIMUM_PEER_ID = 0xFFF,
  211. ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT = 1024 * 1024
  212. };
  213. typedef enum _ENetProtocolCommand {
  214. ENET_PROTOCOL_COMMAND_NONE = 0,
  215. ENET_PROTOCOL_COMMAND_ACKNOWLEDGE = 1,
  216. ENET_PROTOCOL_COMMAND_CONNECT = 2,
  217. ENET_PROTOCOL_COMMAND_VERIFY_CONNECT = 3,
  218. ENET_PROTOCOL_COMMAND_DISCONNECT = 4,
  219. ENET_PROTOCOL_COMMAND_PING = 5,
  220. ENET_PROTOCOL_COMMAND_SEND_RELIABLE = 6,
  221. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE = 7,
  222. ENET_PROTOCOL_COMMAND_SEND_FRAGMENT = 8,
  223. ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED = 9,
  224. ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT = 10,
  225. ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE = 11,
  226. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT = 12,
  227. ENET_PROTOCOL_COMMAND_COUNT = 13,
  228. ENET_PROTOCOL_COMMAND_MASK = 0x0F
  229. } ENetProtocolCommand;
  230. typedef enum _ENetProtocolFlag {
  231. ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE = (1 << 7),
  232. ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED = (1 << 6),
  233. ENET_PROTOCOL_HEADER_FLAG_SENT_TIME = (1 << 14),
  234. ENET_PROTOCOL_HEADER_FLAG_COMPRESSED = (1 << 15),
  235. ENET_PROTOCOL_HEADER_FLAG_MASK = ENET_PROTOCOL_HEADER_FLAG_SENT_TIME | ENET_PROTOCOL_HEADER_FLAG_COMPRESSED,
  236. ENET_PROTOCOL_HEADER_SESSION_MASK = (3 << 12),
  237. ENET_PROTOCOL_HEADER_SESSION_SHIFT = 12
  238. } ENetProtocolFlag;
  239. #ifdef _MSC_VER
  240. #pragma pack(push, 1)
  241. #define ENET_PACKED
  242. #elif defined(__GNUC__) || defined(__clang__)
  243. #define ENET_PACKED __attribute__ ((packed))
  244. #else
  245. #define ENET_PACKED
  246. #endif
  247. typedef struct _ENetProtocolHeader {
  248. enet_uint16 peerID;
  249. enet_uint16 sentTime;
  250. } ENET_PACKED ENetProtocolHeader;
  251. typedef struct _ENetProtocolCommandHeader {
  252. enet_uint8 command;
  253. enet_uint8 channelID;
  254. enet_uint16 reliableSequenceNumber;
  255. } ENET_PACKED ENetProtocolCommandHeader;
  256. typedef struct _ENetProtocolAcknowledge {
  257. ENetProtocolCommandHeader header;
  258. enet_uint16 receivedReliableSequenceNumber;
  259. enet_uint16 receivedSentTime;
  260. } ENET_PACKED ENetProtocolAcknowledge;
  261. typedef struct _ENetProtocolConnect {
  262. ENetProtocolCommandHeader header;
  263. enet_uint16 outgoingPeerID;
  264. enet_uint8 incomingSessionID;
  265. enet_uint8 outgoingSessionID;
  266. enet_uint32 mtu;
  267. enet_uint32 windowSize;
  268. enet_uint32 channelCount;
  269. enet_uint32 incomingBandwidth;
  270. enet_uint32 outgoingBandwidth;
  271. enet_uint32 packetThrottleInterval;
  272. enet_uint32 packetThrottleAcceleration;
  273. enet_uint32 packetThrottleDeceleration;
  274. enet_uint32 connectID;
  275. enet_uint32 data;
  276. } ENET_PACKED ENetProtocolConnect;
  277. typedef struct _ENetProtocolVerifyConnect {
  278. ENetProtocolCommandHeader header;
  279. enet_uint16 outgoingPeerID;
  280. enet_uint8 incomingSessionID;
  281. enet_uint8 outgoingSessionID;
  282. enet_uint32 mtu;
  283. enet_uint32 windowSize;
  284. enet_uint32 channelCount;
  285. enet_uint32 incomingBandwidth;
  286. enet_uint32 outgoingBandwidth;
  287. enet_uint32 packetThrottleInterval;
  288. enet_uint32 packetThrottleAcceleration;
  289. enet_uint32 packetThrottleDeceleration;
  290. enet_uint32 connectID;
  291. } ENET_PACKED ENetProtocolVerifyConnect;
  292. typedef struct _ENetProtocolBandwidthLimit {
  293. ENetProtocolCommandHeader header;
  294. enet_uint32 incomingBandwidth;
  295. enet_uint32 outgoingBandwidth;
  296. } ENET_PACKED ENetProtocolBandwidthLimit;
  297. typedef struct _ENetProtocolThrottleConfigure {
  298. ENetProtocolCommandHeader header;
  299. enet_uint32 packetThrottleInterval;
  300. enet_uint32 packetThrottleAcceleration;
  301. enet_uint32 packetThrottleDeceleration;
  302. } ENET_PACKED ENetProtocolThrottleConfigure;
  303. typedef struct _ENetProtocolDisconnect {
  304. ENetProtocolCommandHeader header;
  305. enet_uint32 data;
  306. } ENET_PACKED ENetProtocolDisconnect;
  307. typedef struct _ENetProtocolPing {
  308. ENetProtocolCommandHeader header;
  309. } ENET_PACKED ENetProtocolPing;
  310. typedef struct _ENetProtocolSendReliable {
  311. ENetProtocolCommandHeader header;
  312. enet_uint16 dataLength;
  313. } ENET_PACKED ENetProtocolSendReliable;
  314. typedef struct _ENetProtocolSendUnreliable {
  315. ENetProtocolCommandHeader header;
  316. enet_uint16 unreliableSequenceNumber;
  317. enet_uint16 dataLength;
  318. } ENET_PACKED ENetProtocolSendUnreliable;
  319. typedef struct _ENetProtocolSendUnsequenced {
  320. ENetProtocolCommandHeader header;
  321. enet_uint16 unsequencedGroup;
  322. enet_uint16 dataLength;
  323. } ENET_PACKED ENetProtocolSendUnsequenced;
  324. typedef struct _ENetProtocolSendFragment {
  325. ENetProtocolCommandHeader header;
  326. enet_uint16 startSequenceNumber;
  327. enet_uint16 dataLength;
  328. enet_uint32 fragmentCount;
  329. enet_uint32 fragmentNumber;
  330. enet_uint32 totalLength;
  331. enet_uint32 fragmentOffset;
  332. } ENET_PACKED ENetProtocolSendFragment;
  333. typedef union _ENetProtocol {
  334. ENetProtocolCommandHeader header;
  335. ENetProtocolAcknowledge acknowledge;
  336. ENetProtocolConnect connect;
  337. ENetProtocolVerifyConnect verifyConnect;
  338. ENetProtocolDisconnect disconnect;
  339. ENetProtocolPing ping;
  340. ENetProtocolSendReliable sendReliable;
  341. ENetProtocolSendUnreliable sendUnreliable;
  342. ENetProtocolSendUnsequenced sendUnsequenced;
  343. ENetProtocolSendFragment sendFragment;
  344. ENetProtocolBandwidthLimit bandwidthLimit;
  345. ENetProtocolThrottleConfigure throttleConfigure;
  346. } ENET_PACKED ENetProtocol;
  347. #ifdef _MSC_VER
  348. #pragma pack(pop)
  349. #endif
  350. /*
  351. =======================================================================
  352. General structs/enums
  353. =======================================================================
  354. */
  355. typedef enum _ENetSocketType {
  356. ENET_SOCKET_TYPE_STREAM = 1,
  357. ENET_SOCKET_TYPE_DATAGRAM = 2
  358. } ENetSocketType;
  359. typedef enum _ENetSocketWait {
  360. ENET_SOCKET_WAIT_NONE = 0,
  361. ENET_SOCKET_WAIT_SEND = (1 << 0),
  362. ENET_SOCKET_WAIT_RECEIVE = (1 << 1),
  363. ENET_SOCKET_WAIT_INTERRUPT = (1 << 2)
  364. } ENetSocketWait;
  365. typedef enum _ENetSocketOption {
  366. ENET_SOCKOPT_NONBLOCK = 1,
  367. ENET_SOCKOPT_BROADCAST = 2,
  368. ENET_SOCKOPT_RCVBUF = 3,
  369. ENET_SOCKOPT_SNDBUF = 4,
  370. ENET_SOCKOPT_REUSEADDR = 5,
  371. ENET_SOCKOPT_RCVTIMEO = 6,
  372. ENET_SOCKOPT_SNDTIMEO = 7,
  373. ENET_SOCKOPT_ERROR = 8,
  374. ENET_SOCKOPT_NODELAY = 9,
  375. ENET_SOCKOPT_IPV6_V6ONLY = 10
  376. } ENetSocketOption;
  377. typedef enum _ENetSocketShutdown {
  378. ENET_SOCKET_SHUTDOWN_READ = 0,
  379. ENET_SOCKET_SHUTDOWN_WRITE = 1,
  380. ENET_SOCKET_SHUTDOWN_READ_WRITE = 2
  381. } ENetSocketShutdown;
  382. typedef struct _ENetAddress {
  383. union {
  384. struct in6_addr ipv6;
  385. struct in4_addr ipv4;
  386. };
  387. uint16_t port;
  388. } ENetAddress;
  389. #define in6_equal(a, b) (memcmp(&a, &b, sizeof(struct in6_addr)) == 0)
  390. typedef enum _ENetPacketFlag {
  391. ENET_PACKET_FLAG_NONE = 0,
  392. ENET_PACKET_FLAG_RELIABLE = (1 << 0),
  393. ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1),
  394. ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2),
  395. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED = (1 << 3),
  396. ENET_PACKET_FLAG_INSTANT = (1 << 4),
  397. ENET_PACKET_FLAG_SENT = (1 << 8)
  398. } ENetPacketFlag;
  399. typedef void (ENET_CALLBACK *ENetPacketFreeCallback)(void*);
  400. typedef struct _ENetPacket {
  401. enet_uint32 flags;
  402. enet_uint32 dataLength;
  403. enet_uint8* data;
  404. ENetPacketFreeCallback freeCallback;
  405. enet_uint32 referenceCount;
  406. } ENetPacket;
  407. typedef struct _ENetAcknowledgement {
  408. ENetListNode acknowledgementList;
  409. enet_uint32 sentTime;
  410. ENetProtocol command;
  411. } ENetAcknowledgement;
  412. typedef struct _ENetOutgoingCommand {
  413. ENetListNode outgoingCommandList;
  414. enet_uint16 reliableSequenceNumber;
  415. enet_uint16 unreliableSequenceNumber;
  416. enet_uint32 sentTime;
  417. enet_uint32 roundTripTimeout;
  418. enet_uint32 roundTripTimeoutLimit;
  419. enet_uint32 fragmentOffset;
  420. enet_uint16 fragmentLength;
  421. enet_uint16 sendAttempts;
  422. ENetProtocol command;
  423. ENetPacket* packet;
  424. } ENetOutgoingCommand;
  425. typedef struct _ENetIncomingCommand {
  426. ENetListNode incomingCommandList;
  427. enet_uint16 reliableSequenceNumber;
  428. enet_uint16 unreliableSequenceNumber;
  429. ENetProtocol command;
  430. enet_uint32 fragmentCount;
  431. enet_uint32 fragmentsRemaining;
  432. enet_uint32* fragments;
  433. ENetPacket* packet;
  434. } ENetIncomingCommand;
  435. typedef enum _ENetPeerState {
  436. ENET_PEER_STATE_DISCONNECTED = 0,
  437. ENET_PEER_STATE_CONNECTING = 1,
  438. ENET_PEER_STATE_ACKNOWLEDGING_CONNECT = 2,
  439. ENET_PEER_STATE_CONNECTION_PENDING = 3,
  440. ENET_PEER_STATE_CONNECTION_SUCCEEDED = 4,
  441. ENET_PEER_STATE_CONNECTED = 5,
  442. ENET_PEER_STATE_DISCONNECT_LATER = 6,
  443. ENET_PEER_STATE_DISCONNECTING = 7,
  444. ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT = 8,
  445. ENET_PEER_STATE_ZOMBIE = 9
  446. } ENetPeerState;
  447. enum {
  448. ENET_HOST_BUFFER_SIZE_MIN = 256 * 1024,
  449. ENET_HOST_BUFFER_SIZE_MAX = 1024 * 1024,
  450. ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000,
  451. ENET_HOST_DEFAULT_MTU = 1280,
  452. ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024,
  453. ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
  454. ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 500,
  455. ENET_PEER_DEFAULT_PACKET_THROTTLE = 32,
  456. ENET_PEER_PACKET_THROTTLE_SCALE = 32,
  457. ENET_PEER_PACKET_THROTTLE_COUNTER = 7,
  458. ENET_PEER_PACKET_THROTTLE_ACCELERATION = 2,
  459. ENET_PEER_PACKET_THROTTLE_DECELERATION = 2,
  460. ENET_PEER_PACKET_THROTTLE_INTERVAL = 5000,
  461. ENET_PEER_PACKET_LOSS_SCALE = (1 << 16),
  462. ENET_PEER_PACKET_LOSS_INTERVAL = 10000,
  463. ENET_PEER_WINDOW_SIZE_SCALE = 64 * 1024,
  464. ENET_PEER_TIMEOUT_LIMIT = 32,
  465. ENET_PEER_TIMEOUT_MINIMUM = 5000,
  466. ENET_PEER_TIMEOUT_MAXIMUM = 30000,
  467. ENET_PEER_PING_INTERVAL = 500,
  468. ENET_PEER_UNSEQUENCED_WINDOWS = 64,
  469. ENET_PEER_UNSEQUENCED_WINDOW_SIZE = 1024,
  470. ENET_PEER_FREE_UNSEQUENCED_WINDOWS = 32,
  471. ENET_PEER_RELIABLE_WINDOWS = 16,
  472. ENET_PEER_RELIABLE_WINDOW_SIZE = 0x1000,
  473. ENET_PEER_FREE_RELIABLE_WINDOWS = 8
  474. };
  475. typedef struct _ENetChannel {
  476. enet_uint16 outgoingReliableSequenceNumber;
  477. enet_uint16 outgoingUnreliableSequenceNumber;
  478. enet_uint16 usedReliableWindows;
  479. enet_uint16 reliableWindows[ENET_PEER_RELIABLE_WINDOWS];
  480. enet_uint16 incomingReliableSequenceNumber;
  481. enet_uint16 incomingUnreliableSequenceNumber;
  482. ENetList incomingReliableCommands;
  483. ENetList incomingUnreliableCommands;
  484. } ENetChannel;
  485. typedef struct _ENetPeer {
  486. ENetListNode dispatchList;
  487. struct _ENetHost* host;
  488. enet_uint16 outgoingPeerID;
  489. enet_uint16 incomingPeerID;
  490. enet_uint32 connectID;
  491. enet_uint8 outgoingSessionID;
  492. enet_uint8 incomingSessionID;
  493. ENetAddress address;
  494. void* data;
  495. ENetPeerState state;
  496. ENetChannel* channels;
  497. size_t channelCount;
  498. enet_uint32 incomingBandwidth;
  499. enet_uint32 outgoingBandwidth;
  500. enet_uint32 incomingBandwidthThrottleEpoch;
  501. enet_uint32 outgoingBandwidthThrottleEpoch;
  502. enet_uint32 incomingDataTotal;
  503. enet_uint64 totalDataReceived;
  504. enet_uint32 outgoingDataTotal;
  505. enet_uint64 totalDataSent;
  506. enet_uint32 lastSendTime;
  507. enet_uint32 lastReceiveTime;
  508. enet_uint32 nextTimeout;
  509. enet_uint32 earliestTimeout;
  510. enet_uint32 packetLossEpoch;
  511. enet_uint32 packetsSent;
  512. enet_uint64 totalPacketsSent;
  513. enet_uint32 packetsLost;
  514. enet_uint64 totalPacketsLost;
  515. enet_uint32 packetLoss;
  516. enet_uint32 packetLossVariance;
  517. enet_uint32 packetThrottle;
  518. enet_uint32 packetThrottleThreshold;
  519. enet_uint32 packetThrottleLimit;
  520. enet_uint32 packetThrottleCounter;
  521. enet_uint32 packetThrottleEpoch;
  522. enet_uint32 packetThrottleAcceleration;
  523. enet_uint32 packetThrottleDeceleration;
  524. enet_uint32 packetThrottleInterval;
  525. enet_uint32 pingInterval;
  526. enet_uint32 timeoutLimit;
  527. enet_uint32 timeoutMinimum;
  528. enet_uint32 timeoutMaximum;
  529. enet_uint32 smoothedRoundTripTime;
  530. enet_uint32 lastRoundTripTime;
  531. enet_uint32 lowestRoundTripTime;
  532. enet_uint32 lastRoundTripTimeVariance;
  533. enet_uint32 highestRoundTripTimeVariance;
  534. enet_uint32 roundTripTime;
  535. enet_uint32 roundTripTimeVariance;
  536. enet_uint32 mtu;
  537. enet_uint32 windowSize;
  538. enet_uint32 reliableDataInTransit;
  539. enet_uint16 outgoingReliableSequenceNumber;
  540. ENetList acknowledgements;
  541. ENetList sentReliableCommands;
  542. ENetList sentUnreliableCommands;
  543. ENetList outgoingReliableCommands;
  544. ENetList outgoingUnreliableCommands;
  545. ENetList dispatchedCommands;
  546. int needsDispatch;
  547. enet_uint16 incomingUnsequencedGroup;
  548. enet_uint16 outgoingUnsequencedGroup;
  549. enet_uint32 unsequencedWindow[ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32];
  550. enet_uint32 eventData;
  551. size_t totalWaitingData;
  552. } ENetPeer;
  553. typedef enet_uint32 (ENET_CALLBACK *ENetChecksumCallback)(const ENetBuffer* buffers, size_t bufferCount);
  554. typedef int (ENET_CALLBACK *ENetInterceptCallback)(struct _ENetHost* host, void* event);
  555. typedef struct _ENetHost {
  556. ENetSocket socket;
  557. ENetAddress address;
  558. enet_uint32 incomingBandwidth;
  559. enet_uint32 outgoingBandwidth;
  560. enet_uint32 bandwidthThrottleEpoch;
  561. enet_uint32 mtu;
  562. enet_uint32 randomSeed;
  563. int recalculateBandwidthLimits;
  564. enet_uint8 preventConnections;
  565. ENetPeer* peers;
  566. size_t peerCount;
  567. size_t channelLimit;
  568. enet_uint32 serviceTime;
  569. ENetList dispatchQueue;
  570. int continueSending;
  571. size_t packetSize;
  572. enet_uint16 headerFlags;
  573. enet_uint32 totalSentData;
  574. enet_uint32 totalSentPackets;
  575. enet_uint32 totalReceivedData;
  576. enet_uint32 totalReceivedPackets;
  577. ENetProtocol commands[ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
  578. size_t commandCount;
  579. ENetBuffer buffers[ENET_BUFFER_MAXIMUM];
  580. size_t bufferCount;
  581. enet_uint8 compression;
  582. char* compressionBuffer;
  583. size_t compressionBufferSize;
  584. ENetChecksumCallback checksumCallback;
  585. enet_uint8 packetData[2][ENET_PROTOCOL_MAXIMUM_MTU];
  586. ENetAddress receivedAddress;
  587. enet_uint8* receivedData;
  588. size_t receivedDataLength;
  589. ENetInterceptCallback interceptCallback;
  590. size_t connectedPeers;
  591. size_t bandwidthLimitedPeers;
  592. size_t duplicatePeers;
  593. size_t maximumPacketSize;
  594. size_t maximumWaitingData;
  595. } ENetHost;
  596. typedef enum _ENetEventType {
  597. ENET_EVENT_TYPE_NONE = 0,
  598. ENET_EVENT_TYPE_CONNECT = 1,
  599. ENET_EVENT_TYPE_DISCONNECT = 2,
  600. ENET_EVENT_TYPE_RECEIVE = 3,
  601. ENET_EVENT_TYPE_DISCONNECT_TIMEOUT = 4
  602. } ENetEventType;
  603. typedef struct _ENetEvent {
  604. ENetEventType type;
  605. ENetPeer* peer;
  606. enet_uint8 channelID;
  607. enet_uint32 data;
  608. ENetPacket* packet;
  609. } ENetEvent;
  610. /*
  611. =======================================================================
  612. Public API
  613. =======================================================================
  614. */
  615. ENET_API int enet_initialize(void);
  616. ENET_API int enet_initialize_with_callbacks(ENetVersion, const ENetCallbacks*);
  617. ENET_API void enet_deinitialize(void);
  618. ENET_API ENetVersion enet_linked_version(void);
  619. ENET_API int enet_array_is_zeroed(const uint8_t*, int);
  620. ENET_API size_t enet_string_copy(char*, const char*, size_t);
  621. ENET_API enet_uint32 enet_time_get(void);
  622. ENET_API enet_uint32 enet_crc32(const ENetBuffer*, size_t);
  623. ENET_API ENetPacket* enet_packet_create(const void*, size_t, enet_uint32);
  624. ENET_API ENetPacket* enet_packet_create_offset(const void*, size_t, size_t, enet_uint32);
  625. ENET_API void enet_packet_destroy(ENetPacket*);
  626. ENET_API int enet_peer_send(ENetPeer*, enet_uint8, ENetPacket*);
  627. ENET_API ENetPacket* enet_peer_receive(ENetPeer*, enet_uint8*);
  628. ENET_API void enet_peer_ping(ENetPeer*);
  629. ENET_API void enet_peer_ping_interval(ENetPeer*, enet_uint32);
  630. ENET_API void enet_peer_timeout(ENetPeer*, enet_uint32, enet_uint32, enet_uint32);
  631. ENET_API void enet_peer_reset(ENetPeer*);
  632. ENET_API void enet_peer_disconnect(ENetPeer*, enet_uint32);
  633. ENET_API void enet_peer_disconnect_now(ENetPeer*, enet_uint32);
  634. ENET_API void enet_peer_disconnect_later(ENetPeer*, enet_uint32);
  635. ENET_API void enet_peer_throttle_configure(ENetPeer*, enet_uint32, enet_uint32, enet_uint32, enet_uint32);
  636. ENET_API ENetHost* enet_host_create(const ENetAddress*, size_t, size_t, enet_uint32, enet_uint32, int);
  637. ENET_API void enet_host_destroy(ENetHost*);
  638. ENET_API void enet_host_enable_compression(ENetHost*);
  639. ENET_API void enet_host_prevent_connections(ENetHost*, enet_uint8);
  640. ENET_API ENetPeer* enet_host_connect(ENetHost*, const ENetAddress*, size_t, enet_uint32);
  641. ENET_API int enet_host_check_events(ENetHost*, ENetEvent*);
  642. ENET_API int enet_host_service(ENetHost*, ENetEvent*, enet_uint32);
  643. ENET_API void enet_host_flush(ENetHost*);
  644. ENET_API void enet_host_broadcast(ENetHost*, enet_uint8, ENetPacket*);
  645. ENET_API void enet_host_broadcast_exclude(ENetHost*, enet_uint8, ENetPacket*, ENetPeer*);
  646. ENET_API void enet_host_broadcast_selective(ENetHost*, enet_uint8, ENetPacket*, ENetPeer**, size_t);
  647. ENET_API void enet_host_channel_limit(ENetHost*, size_t);
  648. ENET_API void enet_host_bandwidth_limit(ENetHost*, enet_uint32, enet_uint32);
  649. ENET_API int enet_address_set_host_ip(ENetAddress*, const char*);
  650. ENET_API int enet_address_set_host(ENetAddress*, const char*);
  651. ENET_API int enet_address_get_host_ip(const ENetAddress*, char*, size_t);
  652. ENET_API int enet_address_get_host(const ENetAddress*, char*, size_t);
  653. ENET_API ENetSocket enet_socket_create(ENetSocketType);
  654. ENET_API int enet_socket_bind(ENetSocket, const ENetAddress*);
  655. ENET_API int enet_socket_get_address(ENetSocket, ENetAddress*);
  656. ENET_API int enet_socket_listen(ENetSocket, int);
  657. ENET_API ENetSocket enet_socket_accept(ENetSocket, ENetAddress*);
  658. ENET_API int enet_socket_connect(ENetSocket, const ENetAddress*);
  659. ENET_API int enet_socket_send(ENetSocket, const ENetAddress*, const ENetBuffer*, size_t);
  660. ENET_API int enet_socket_receive(ENetSocket, ENetAddress*, ENetBuffer*, size_t);
  661. ENET_API int enet_socket_wait(ENetSocket, enet_uint32*, enet_uint64);
  662. ENET_API int enet_socket_set_option(ENetSocket, ENetSocketOption, int);
  663. ENET_API int enet_socket_get_option(ENetSocket, ENetSocketOption, int*);
  664. ENET_API int enet_socket_shutdown(ENetSocket, ENetSocketShutdown);
  665. ENET_API void enet_socket_destroy(ENetSocket);
  666. ENET_API int enet_socket_set_select(ENetSocket, ENetSocketSet*, ENetSocketSet*, enet_uint32);
  667. /* Extended API for easier binding in other programming languages */
  668. ENET_API void* enet_packet_get_data(const ENetPacket*);
  669. ENET_API int enet_packet_get_length(const ENetPacket*);
  670. ENET_API void enet_packet_set_free_callback(ENetPacket*, const void*);
  671. ENET_API int enet_packet_check_references(const ENetPacket*);
  672. ENET_API void enet_packet_dispose(ENetPacket*);
  673. ENET_API enet_uint32 enet_host_get_peers_count(const ENetHost*);
  674. ENET_API enet_uint32 enet_host_get_packets_sent(const ENetHost*);
  675. ENET_API enet_uint32 enet_host_get_packets_received(const ENetHost*);
  676. ENET_API enet_uint32 enet_host_get_bytes_sent(const ENetHost*);
  677. ENET_API enet_uint32 enet_host_get_bytes_received(const ENetHost*);
  678. ENET_API enet_uint32 enet_peer_get_id(const ENetPeer*);
  679. ENET_API int enet_peer_get_ip(const ENetPeer*, char*, size_t);
  680. ENET_API enet_uint16 enet_peer_get_port(const ENetPeer*);
  681. ENET_API enet_uint32 enet_peer_get_mtu(const ENetPeer*);
  682. ENET_API ENetPeerState enet_peer_get_state(const ENetPeer*);
  683. ENET_API enet_uint32 enet_peer_get_rtt(const ENetPeer*);
  684. ENET_API enet_uint32 enet_peer_get_lastsendtime(const ENetPeer*);
  685. ENET_API enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer*);
  686. ENET_API enet_uint64 enet_peer_get_packets_sent(const ENetPeer*);
  687. ENET_API enet_uint64 enet_peer_get_packets_lost(const ENetPeer*);
  688. ENET_API enet_uint64 enet_peer_get_bytes_sent(const ENetPeer*);
  689. ENET_API enet_uint64 enet_peer_get_bytes_received(const ENetPeer*);
  690. ENET_API void* enet_peer_get_data(const ENetPeer*);
  691. ENET_API void enet_peer_set_data(ENetPeer*, const void*);
  692. /*
  693. =======================================================================
  694. Private API
  695. =======================================================================
  696. */
  697. extern void enet_host_bandwidth_throttle(ENetHost*);
  698. extern enet_uint64 enet_host_random_seed(void);
  699. extern int enet_peer_throttle(ENetPeer*, enet_uint32);
  700. extern void enet_peer_reset_queues(ENetPeer*);
  701. extern void enet_peer_setup_outgoing_command(ENetPeer*, ENetOutgoingCommand*);
  702. extern ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer*, const ENetProtocol*, ENetPacket*, enet_uint32, enet_uint16);
  703. extern ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer*, const ENetProtocol*, const void*, size_t, enet_uint32, enet_uint32);
  704. extern ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer*, const ENetProtocol*, enet_uint16);
  705. extern void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer*, ENetChannel*);
  706. extern void enet_peer_dispatch_incoming_reliable_commands(ENetPeer*, ENetChannel*);
  707. extern void enet_peer_on_connect(ENetPeer*);
  708. extern void enet_peer_on_disconnect(ENetPeer*);
  709. extern size_t enet_protocol_command_size(enet_uint8);
  710. #ifdef __cplusplus
  711. }
  712. #endif
  713. #if defined(ENET_IMPLEMENTATION) && !defined(ENET_IMPLEMENTATION_DONE)
  714. #define ENET_IMPLEMENTATION_DONE 1
  715. #ifdef __cplusplus
  716. extern "C" {
  717. #endif
  718. #ifdef ENET_LZ4
  719. #include "lz4/lz4.h"
  720. #endif
  721. #ifdef __MINGW32__
  722. #include "mingw/inet_ntop.c"
  723. #include "mingw/inet_pton.c"
  724. #endif
  725. /*
  726. =======================================================================
  727. Atomics
  728. =======================================================================
  729. */
  730. #ifdef _MSC_VER
  731. #define ENET_AT_CASSERT_PRED(predicate) sizeof(char[2 * !!(predicate) - 1])
  732. #define ENET_IS_SUPPORTED_ATOMIC(size) ENET_AT_CASSERT_PRED(size == 1 || size == 2 || size == 4 || size == 8)
  733. #define ENET_ATOMIC_SIZEOF(variable) (ENET_IS_SUPPORTED_ATOMIC(sizeof(*(variable))), sizeof(*(variable)))
  734. __inline int64_t enet_at_atomic_read(char* ptr, size_t size) {
  735. switch (size) {
  736. case 1:
  737. return _InterlockedExchangeAdd8((volatile char*)ptr, 0);
  738. case 2:
  739. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, 0);
  740. case 4:
  741. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  742. return InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  743. #else
  744. return _InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  745. #endif
  746. case 8:
  747. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  748. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  749. #else
  750. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  751. #endif
  752. default:
  753. return 0x0;
  754. }
  755. }
  756. __inline int64_t enet_at_atomic_write(char* ptr, int64_t value, size_t size) {
  757. switch (size) {
  758. case 1:
  759. return _InterlockedExchange8((volatile char*)ptr, (char)value);
  760. case 2:
  761. return _InterlockedExchange16((volatile SHORT*)ptr, (SHORT)value);
  762. case 4:
  763. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  764. return InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  765. #else
  766. return _InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  767. #endif
  768. case 8:
  769. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  770. return InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  771. #else
  772. return _InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  773. #endif
  774. default:
  775. return 0x0;
  776. }
  777. }
  778. __inline int64_t enet_at_atomic_cas(char* ptr, int64_t new_val, int64_t old_val, size_t size) {
  779. switch (size) {
  780. case 1:
  781. return _InterlockedCompareExchange8((volatile char*)ptr, (char)new_val, (char)old_val);
  782. case 2:
  783. return _InterlockedCompareExchange16((volatile SHORT*)ptr, (SHORT)new_val, (SHORT)old_val);
  784. case 4:
  785. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  786. return InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  787. #else
  788. return _InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  789. #endif
  790. case 8:
  791. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  792. return InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  793. #else
  794. return _InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  795. #endif
  796. default:
  797. return 0x0;
  798. }
  799. }
  800. __inline int64_t enet_at_atomic_inc(char* ptr, int64_t delta, size_t data_size) {
  801. switch (data_size) {
  802. case 1:
  803. return _InterlockedExchangeAdd8((volatile char*)ptr, (char)delta);
  804. case 2:
  805. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, (SHORT)delta);
  806. case 4:
  807. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  808. return InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  809. #else
  810. return _InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  811. #endif
  812. case 8:
  813. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  814. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  815. #else
  816. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  817. #endif
  818. default:
  819. return 0x0;
  820. }
  821. }
  822. #define ENET_ATOMIC_READ(variable) enet_at_atomic_read((char*)(variable), ENET_ATOMIC_SIZEOF(variable))
  823. #define ENET_ATOMIC_WRITE(variable, new_val) enet_at_atomic_write((char*)(variable), (int64_t)(new_val), ENET_ATOMIC_SIZEOF(variable))
  824. #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))
  825. #define ENET_ATOMIC_INC(variable) enet_at_atomic_inc((char*)(variable), 1, ENET_ATOMIC_SIZEOF(variable))
  826. #define ENET_ATOMIC_DEC(variable) enet_at_atomic_inc((char*)(variable), -1, ENET_ATOMIC_SIZEOF(variable))
  827. #define ENET_ATOMIC_INC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), (delta), ENET_ATOMIC_SIZEOF(variable))
  828. #define ENET_ATOMIC_DEC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), -(delta), ENET_ATOMIC_SIZEOF(variable))
  829. #elif defined(__GNUC__) || defined(__clang__)
  830. #if defined(__clang__) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
  831. #define AT_HAVE_ATOMICS
  832. #endif
  833. /* We want to use __atomic built-ins if possible because the __sync primitives are
  834. deprecated, because the __atomic build-ins allow us to use ENET_ATOMIC_WRITE on
  835. uninitialized memory without running into undefined behavior, and because the
  836. __atomic versions generate more efficient code since we don't need to rely on
  837. CAS when we don't actually want it.
  838. Note that we use acquire-release memory order (like mutexes do). We could use
  839. sequentially consistent memory order but that has lower performance and is
  840. almost always unneeded. */
  841. #ifdef AT_HAVE_ATOMICS
  842. #define ENET_ATOMIC_READ(ptr) __atomic_load_n((ptr), __ATOMIC_ACQUIRE)
  843. #define ENET_ATOMIC_WRITE(ptr, value) __atomic_store_n((ptr), (value), __ATOMIC_RELEASE)
  844. #ifndef typeof
  845. #define typeof __typeof__
  846. #endif
  847. /* clang_analyzer doesn't know that CAS writes to memory so it complains about
  848. potentially lost data. Replace the code with the equivalent non-sync code. */
  849. #ifdef __clang_analyzer__
  850. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  851. ({ \
  852. typeof(*(ptr)) ENET_ATOMIC_CAS_old_actual_ = (*(ptr)); \
  853. if (ATOMIC_CAS_old_actual_ == (old_value)) \
  854. *(ptr) = new_value; \
  855. ENET_ATOMIC_CAS_old_actual_; \
  856. })
  857. #else
  858. /* Could use __auto_type instead of typeof but that shouldn't work in C++.
  859. The ({ }) syntax is a GCC extension called statement expression. It lets
  860. us return a value out of the macro.
  861. TODO We should return bool here instead of the old value to avoid the ABA
  862. problem. */
  863. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  864. ({ \
  865. typeof(*(ptr)) ENET_ATOMIC_CAS_expected_ = (old_value); \
  866. __atomic_compare_exchange_n((ptr), &ENET_ATOMIC_CAS_expected_, (new_value), false, \
  867. __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE); \
  868. ENET_ATOMIC_CAS_expected_; \
  869. })
  870. #endif
  871. #define ENET_ATOMIC_INC(ptr) __atomic_fetch_add((ptr), 1, __ATOMIC_ACQ_REL)
  872. #define ENET_ATOMIC_DEC(ptr) __atomic_fetch_sub((ptr), 1, __ATOMIC_ACQ_REL)
  873. #define ENET_ATOMIC_INC_BY(ptr, delta) __atomic_fetch_add((ptr), (delta), __ATOMIC_ACQ_REL)
  874. #define ENET_ATOMIC_DEC_BY(ptr, delta) __atomic_fetch_sub((ptr), (delta), __ATOMIC_ACQ_REL)
  875. #else
  876. #define ENET_ATOMIC_READ(variable) __sync_fetch_and_add(variable, 0)
  877. #define ENET_ATOMIC_WRITE(variable, new_val) (void)__sync_val_compare_and_swap((variable), *(variable), (new_val))
  878. #define ENET_ATOMIC_CAS(variable, old_value, new_val) __sync_val_compare_and_swap((variable), (old_value), (new_val))
  879. #define ENET_ATOMIC_INC(variable) __sync_fetch_and_add((variable), 1)
  880. #define ENET_ATOMIC_DEC(variable) __sync_fetch_and_sub((variable), 1)
  881. #define ENET_ATOMIC_INC_BY(variable, delta) __sync_fetch_and_add((variable), (delta), 1)
  882. #define ENET_ATOMIC_DEC_BY(variable, delta) __sync_fetch_and_sub((variable), (delta), 1)
  883. #endif
  884. #undef AT_HAVE_ATOMICS
  885. #endif
  886. /*
  887. =======================================================================
  888. Callbacks
  889. =======================================================================
  890. */
  891. static ENetCallbacks callbacks = {
  892. malloc,
  893. free,
  894. abort
  895. };
  896. int enet_initialize_with_callbacks(ENetVersion version, const ENetCallbacks* inits) {
  897. if (version < ENET_VERSION_CREATE(1, 3, 0))
  898. {
  899. ENET_LOG_ERROR("ENET version is too old");
  900. return -1;
  901. }
  902. if (inits->malloc != NULL || inits->free != NULL) {
  903. if (inits->malloc == NULL || inits->free == NULL) {
  904. ENET_LOG_ERROR("memory allocator or free thingy is NULL");
  905. return -1;
  906. }
  907. callbacks.malloc = inits->malloc;
  908. callbacks.free = inits->free;
  909. }
  910. if (inits->noMemory != NULL)
  911. callbacks.noMemory = inits->noMemory;
  912. return enet_initialize();
  913. }
  914. void* enet_malloc(size_t size) {
  915. void* memory = callbacks.malloc(size);
  916. if (memory == NULL)
  917. callbacks.noMemory();
  918. return memory;
  919. }
  920. void enet_free(void* memory) {
  921. callbacks.free(memory);
  922. }
  923. /*
  924. =======================================================================
  925. List
  926. =======================================================================
  927. */
  928. void enet_list_clear(ENetList* list) {
  929. list->sentinel.next = &list->sentinel;
  930. list->sentinel.previous = &list->sentinel;
  931. }
  932. ENetListIterator enet_list_insert(ENetListIterator position, void* data) {
  933. ENetListIterator result = (ENetListIterator)data;
  934. result->previous = position->previous;
  935. result->next = position;
  936. result->previous->next = result;
  937. position->previous = result;
  938. return result;
  939. }
  940. void* enet_list_remove(ENetListIterator position) {
  941. position->previous->next = position->next;
  942. position->next->previous = position->previous;
  943. return position;
  944. }
  945. ENetListIterator enet_list_move(ENetListIterator position, void* dataFirst, void* dataLast) {
  946. ENetListIterator first = (ENetListIterator)dataFirst;
  947. ENetListIterator last = (ENetListIterator)dataLast;
  948. first->previous->next = last->next;
  949. last->next->previous = first->previous;
  950. first->previous = position->previous;
  951. last->next = position;
  952. first->previous->next = first;
  953. position->previous = last;
  954. return first;
  955. }
  956. size_t enet_list_size(ENetList* list) {
  957. size_t size = 0;
  958. ENetListIterator position;
  959. for (position = enet_list_begin(list); position != enet_list_end(list); position = enet_list_next(position)) {
  960. ++size;
  961. }
  962. return size;
  963. }
  964. /*
  965. =======================================================================
  966. Utilities
  967. =======================================================================
  968. */
  969. ENetVersion enet_linked_version(void) {
  970. return ENET_VERSION;
  971. }
  972. int enet_array_is_zeroed(const uint8_t* array, int length) {
  973. size_t i;
  974. for (i = 0; i < length; i++) {
  975. if (array[i] != 0)
  976. return -1;
  977. }
  978. return 0;
  979. }
  980. size_t enet_string_copy(char* destination, const char* source, size_t length) {
  981. char *d = destination;
  982. const char *s = source;
  983. size_t n = length;
  984. if (n != 0 && --n != 0) {
  985. do {
  986. if ((*d++ = *s++) == 0)
  987. break;
  988. }
  989. while (--n != 0);
  990. }
  991. if (n == 0) {
  992. if (length != 0)
  993. *d = '\0';
  994. while (*s++);
  995. }
  996. return (s - source - 1);
  997. }
  998. /*
  999. =======================================================================
  1000. Time
  1001. =======================================================================
  1002. */
  1003. #ifdef _WIN32
  1004. static LARGE_INTEGER gettime_offset(void) {
  1005. SYSTEMTIME s;
  1006. FILETIME f;
  1007. LARGE_INTEGER t;
  1008. s.wYear = 1970;
  1009. s.wMonth = 1;
  1010. s.wDay = 1;
  1011. s.wHour = 0;
  1012. s.wMinute = 0;
  1013. s.wSecond = 0;
  1014. s.wMilliseconds = 0;
  1015. SystemTimeToFileTime(&s, &f);
  1016. t.QuadPart = f.dwHighDateTime;
  1017. t.QuadPart <<= 32;
  1018. t.QuadPart |= f.dwLowDateTime;
  1019. return t;
  1020. }
  1021. int clock_gettime(int X, struct timespec* tv) {
  1022. LARGE_INTEGER t;
  1023. FILETIME f;
  1024. double microseconds;
  1025. static LARGE_INTEGER offset;
  1026. static double frequencyToMicroseconds;
  1027. static int initialized = 0;
  1028. static BOOL usePerformanceCounter = 0;
  1029. if (!initialized) {
  1030. LARGE_INTEGER performanceFrequency;
  1031. initialized = 1;
  1032. usePerformanceCounter = QueryPerformanceFrequency(&performanceFrequency);
  1033. if (usePerformanceCounter) {
  1034. QueryPerformanceCounter(&offset);
  1035. frequencyToMicroseconds = (double)performanceFrequency.QuadPart / 1000000.;
  1036. } else {
  1037. offset = gettime_offset();
  1038. frequencyToMicroseconds = 10.;
  1039. }
  1040. }
  1041. if (usePerformanceCounter) {
  1042. QueryPerformanceCounter(&t);
  1043. } else {
  1044. GetSystemTimeAsFileTime(&f);
  1045. t.QuadPart = f.dwHighDateTime;
  1046. t.QuadPart <<= 32;
  1047. t.QuadPart |= f.dwLowDateTime;
  1048. }
  1049. t.QuadPart -= offset.QuadPart;
  1050. microseconds = (double)t.QuadPart / frequencyToMicroseconds;
  1051. t.QuadPart = (LONGLONG)microseconds;
  1052. tv->tv_sec = (long)(t.QuadPart / 1000000);
  1053. tv->tv_nsec = t.QuadPart % 1000000 * 1000;
  1054. return 0;
  1055. }
  1056. #elif __APPLE__ && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 && !defined(CLOCK_MONOTONIC)
  1057. #define CLOCK_MONOTONIC 0
  1058. int clock_gettime(int X, struct timespec* ts) {
  1059. clock_serv_t cclock;
  1060. mach_timespec_t mts;
  1061. host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
  1062. clock_get_time(cclock, &mts);
  1063. mach_port_deallocate(mach_task_self(), cclock);
  1064. ts->tv_sec = mts.tv_sec;
  1065. ts->tv_nsec = mts.tv_nsec;
  1066. return 0;
  1067. }
  1068. #endif
  1069. enet_uint32 enet_time_get(void) {
  1070. static enet_uint64 start_time_ns = 0;
  1071. struct timespec ts;
  1072. #ifdef CLOCK_MONOTONIC_RAW
  1073. clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
  1074. #else
  1075. clock_gettime(CLOCK_MONOTONIC, &ts);
  1076. #endif
  1077. static const enet_uint64 ns_in_s = 1000 * 1000 * 1000;
  1078. static const enet_uint64 ns_in_ms = 1000 * 1000;
  1079. enet_uint64 current_time_ns = ts.tv_nsec + (enet_uint64)ts.tv_sec * ns_in_s;
  1080. enet_uint64 offset_ns = ENET_ATOMIC_READ(&start_time_ns);
  1081. if (offset_ns == 0) {
  1082. enet_uint64 want_value = current_time_ns - 1 * ns_in_ms;
  1083. enet_uint64 old_value = ENET_ATOMIC_CAS(&start_time_ns, 0, want_value);
  1084. offset_ns = old_value == 0 ? want_value : old_value;
  1085. }
  1086. enet_uint64 result_in_ns = current_time_ns - offset_ns;
  1087. return (enet_uint32)(result_in_ns / ns_in_ms);
  1088. }
  1089. /*
  1090. =======================================================================
  1091. Checksum
  1092. =======================================================================
  1093. */
  1094. static int initializedCRC32 = 0;
  1095. static enet_uint32 crcTable[256];
  1096. static enet_uint32 reflect_crc(int val, int bits) {
  1097. int result = 0, bit;
  1098. for (bit = 0; bit < bits; bit++) {
  1099. if (val & 1)
  1100. result |= 1 << (bits - 1 - bit);
  1101. val >>= 1;
  1102. }
  1103. return result;
  1104. }
  1105. static void initialize_crc32(void) {
  1106. int byte;
  1107. for (byte = 0; byte < 256; ++byte) {
  1108. enet_uint32 crc = reflect_crc(byte, 8) << 24;
  1109. int offset;
  1110. for (offset = 0; offset < 8; ++offset) {
  1111. if (crc & 0x80000000)
  1112. crc = (crc << 1) ^ 0x04c11db7;
  1113. else
  1114. crc <<= 1;
  1115. }
  1116. crcTable[byte] = reflect_crc(crc, 32);
  1117. }
  1118. initializedCRC32 = 1;
  1119. }
  1120. enet_uint32 enet_crc32(const ENetBuffer* buffers, size_t bufferCount) {
  1121. enet_uint32 crc = 0xFFFFFFFF;
  1122. if (!initializedCRC32)
  1123. initialize_crc32();
  1124. while (bufferCount-- > 0) {
  1125. const enet_uint8* data = (const enet_uint8*)buffers->data;
  1126. const enet_uint8* dataEnd = &data[buffers->dataLength];
  1127. while (data < dataEnd) {
  1128. crc = (crc >> 8) ^ crcTable[(crc & 0xFF)^* data++];
  1129. }
  1130. ++buffers;
  1131. }
  1132. return ENET_HOST_TO_NET_32(~crc);
  1133. }
  1134. /*
  1135. =======================================================================
  1136. Packet
  1137. =======================================================================
  1138. */
  1139. ENetPacket* enet_packet_create(const void* data, size_t dataLength, enet_uint32 flags) {
  1140. ENetPacket* packet;
  1141. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1142. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1143. if (packet == NULL)
  1144. return NULL;
  1145. packet->data = (enet_uint8*)data;
  1146. } else {
  1147. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength);
  1148. if (packet == NULL)
  1149. return NULL;
  1150. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1151. if (data != NULL)
  1152. memcpy(packet->data, data, dataLength);
  1153. }
  1154. packet->referenceCount = 0;
  1155. packet->flags = flags;
  1156. packet->dataLength = dataLength;
  1157. packet->freeCallback = NULL;
  1158. return packet;
  1159. }
  1160. ENetPacket* enet_packet_create_offset(const void* data, size_t dataLength, size_t dataOffset, enet_uint32 flags) {
  1161. ENetPacket* packet;
  1162. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1163. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1164. if (packet == NULL)
  1165. return NULL;
  1166. packet->data = (enet_uint8*)data;
  1167. } else {
  1168. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength - dataOffset);
  1169. if (packet == NULL)
  1170. return NULL;
  1171. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1172. if (data != NULL)
  1173. memcpy(packet->data, (char*)data + dataOffset, dataLength - dataOffset);
  1174. }
  1175. packet->referenceCount = 0;
  1176. packet->flags = flags;
  1177. packet->dataLength = dataLength - dataOffset;
  1178. packet->freeCallback = NULL;
  1179. return packet;
  1180. }
  1181. void enet_packet_destroy(ENetPacket* packet) {
  1182. if (packet == NULL)
  1183. return;
  1184. if (packet->freeCallback != NULL)
  1185. (*packet->freeCallback)((void*)packet);
  1186. enet_free(packet);
  1187. }
  1188. /*
  1189. =======================================================================
  1190. Protocol
  1191. =======================================================================
  1192. */
  1193. static size_t commandSizes[ENET_PROTOCOL_COMMAND_COUNT] = {
  1194. 0,
  1195. sizeof(ENetProtocolAcknowledge),
  1196. sizeof(ENetProtocolConnect),
  1197. sizeof(ENetProtocolVerifyConnect),
  1198. sizeof(ENetProtocolDisconnect),
  1199. sizeof(ENetProtocolPing),
  1200. sizeof(ENetProtocolSendReliable),
  1201. sizeof(ENetProtocolSendUnreliable),
  1202. sizeof(ENetProtocolSendFragment),
  1203. sizeof(ENetProtocolSendUnsequenced),
  1204. sizeof(ENetProtocolBandwidthLimit),
  1205. sizeof(ENetProtocolThrottleConfigure),
  1206. sizeof(ENetProtocolSendFragment)
  1207. };
  1208. size_t enet_protocol_command_size(enet_uint8 commandNumber) {
  1209. return commandSizes[commandNumber & ENET_PROTOCOL_COMMAND_MASK];
  1210. }
  1211. static void enet_protocol_change_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1212. if (state == ENET_PEER_STATE_CONNECTED || state == ENET_PEER_STATE_DISCONNECT_LATER)
  1213. enet_peer_on_connect(peer);
  1214. else
  1215. enet_peer_on_disconnect(peer);
  1216. peer->state = state;
  1217. }
  1218. static void enet_protocol_dispatch_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1219. enet_protocol_change_state(host, peer, state);
  1220. if (!peer->needsDispatch) {
  1221. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1222. peer->needsDispatch = 1;
  1223. }
  1224. }
  1225. static int enet_protocol_dispatch_incoming_commands(ENetHost* host, ENetEvent* event) {
  1226. while (!enet_list_empty(&host->dispatchQueue)) {
  1227. ENetPeer* peer = (ENetPeer*)enet_list_remove(enet_list_begin(&host->dispatchQueue));
  1228. peer->needsDispatch = 0;
  1229. switch (peer->state) {
  1230. case ENET_PEER_STATE_CONNECTION_PENDING:
  1231. case ENET_PEER_STATE_CONNECTION_SUCCEEDED:
  1232. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1233. event->type = ENET_EVENT_TYPE_CONNECT;
  1234. event->peer = peer;
  1235. event->data = peer->eventData;
  1236. return 1;
  1237. case ENET_PEER_STATE_ZOMBIE:
  1238. host->recalculateBandwidthLimits = 1;
  1239. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1240. event->peer = peer;
  1241. event->data = peer->eventData;
  1242. enet_peer_reset(peer);
  1243. return 1;
  1244. case ENET_PEER_STATE_CONNECTED:
  1245. if (enet_list_empty(&peer->dispatchedCommands))
  1246. continue;
  1247. event->packet = enet_peer_receive(peer, &event->channelID);
  1248. if (event->packet == NULL)
  1249. continue;
  1250. event->type = ENET_EVENT_TYPE_RECEIVE;
  1251. event->peer = peer;
  1252. if (!enet_list_empty(&peer->dispatchedCommands)) {
  1253. peer->needsDispatch = 1;
  1254. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1255. }
  1256. return 1;
  1257. default:
  1258. break;
  1259. }
  1260. }
  1261. return 0;
  1262. }
  1263. static void enet_protocol_notify_connect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1264. host->recalculateBandwidthLimits = 1;
  1265. if (event != NULL) {
  1266. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1267. peer->totalDataSent = 0;
  1268. peer->totalDataReceived = 0;
  1269. peer->totalPacketsSent = 0;
  1270. peer->totalPacketsLost = 0;
  1271. event->type = ENET_EVENT_TYPE_CONNECT;
  1272. event->peer = peer;
  1273. event->data = peer->eventData;
  1274. } else {
  1275. enet_protocol_dispatch_state(host, peer, peer->state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING);
  1276. }
  1277. }
  1278. static void enet_protocol_notify_disconnect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1279. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1280. host->recalculateBandwidthLimits = 1;
  1281. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1282. enet_peer_reset(peer);
  1283. } else if (event != NULL) {
  1284. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1285. event->peer = peer;
  1286. event->data = 0;
  1287. enet_peer_reset(peer);
  1288. } else {
  1289. peer->eventData = 0;
  1290. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1291. }
  1292. }
  1293. static void enet_protocol_notify_disconnect_timeout(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1294. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1295. host->recalculateBandwidthLimits = 1;
  1296. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1297. enet_peer_reset(peer);
  1298. } else if (event != NULL) {
  1299. event->type = ENET_EVENT_TYPE_DISCONNECT_TIMEOUT;
  1300. event->peer = peer;
  1301. event->data = 0;
  1302. enet_peer_reset(peer);
  1303. } else {
  1304. peer->eventData = 0;
  1305. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1306. }
  1307. }
  1308. static void enet_protocol_remove_sent_unreliable_commands(ENetPeer* peer) {
  1309. ENetOutgoingCommand* outgoingCommand;
  1310. if (enet_list_empty(&peer->sentUnreliableCommands))
  1311. return;
  1312. do {
  1313. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentUnreliableCommands);
  1314. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1315. if (outgoingCommand->packet != NULL) {
  1316. --outgoingCommand->packet->referenceCount;
  1317. if (outgoingCommand->packet->referenceCount == 0) {
  1318. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1319. enet_packet_destroy(outgoingCommand->packet);
  1320. }
  1321. }
  1322. enet_free(outgoingCommand);
  1323. }
  1324. while (!enet_list_empty(&peer->sentUnreliableCommands));
  1325. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1326. enet_peer_disconnect(peer, peer->eventData);
  1327. }
  1328. static ENetProtocolCommand enet_protocol_remove_sent_reliable_command(ENetPeer* peer, enet_uint16 reliableSequenceNumber, enet_uint8 channelID) {
  1329. ENetOutgoingCommand* outgoingCommand = NULL;
  1330. ENetListIterator currentCommand;
  1331. ENetProtocolCommand commandNumber;
  1332. int wasSent = 1;
  1333. for (currentCommand = enet_list_begin(&peer->sentReliableCommands); currentCommand != enet_list_end(&peer->sentReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1334. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1335. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1336. break;
  1337. }
  1338. if (currentCommand == enet_list_end(&peer->sentReliableCommands)) {
  1339. for (currentCommand = enet_list_begin(&peer->outgoingReliableCommands); currentCommand != enet_list_end(&peer->outgoingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1340. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1341. if (outgoingCommand->sendAttempts < 1)
  1342. return ENET_PROTOCOL_COMMAND_NONE;
  1343. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1344. break;
  1345. }
  1346. if (currentCommand == enet_list_end(&peer->outgoingReliableCommands))
  1347. return ENET_PROTOCOL_COMMAND_NONE;
  1348. wasSent = 0;
  1349. }
  1350. if (outgoingCommand == NULL)
  1351. return ENET_PROTOCOL_COMMAND_NONE;
  1352. if (channelID < peer->channelCount) {
  1353. ENetChannel* channel = &peer->channels[channelID];
  1354. enet_uint16 reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1355. if (channel->reliableWindows[reliableWindow] > 0) {
  1356. --channel->reliableWindows[reliableWindow];
  1357. if (!channel->reliableWindows[reliableWindow])
  1358. channel->usedReliableWindows &= ~(1 << reliableWindow);
  1359. }
  1360. }
  1361. commandNumber = (ENetProtocolCommand)(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK);
  1362. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1363. if (outgoingCommand->packet != NULL) {
  1364. if (wasSent)
  1365. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  1366. --outgoingCommand->packet->referenceCount;
  1367. if (outgoingCommand->packet->referenceCount == 0) {
  1368. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1369. enet_packet_destroy(outgoingCommand->packet);
  1370. }
  1371. }
  1372. enet_free(outgoingCommand);
  1373. if (enet_list_empty(&peer->sentReliableCommands))
  1374. return commandNumber;
  1375. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentReliableCommands);
  1376. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  1377. return commandNumber;
  1378. }
  1379. static ENetPeer* enet_protocol_handle_connect(ENetHost* host, ENetProtocolHeader* header, ENetProtocol* command) {
  1380. enet_uint8 incomingSessionID, outgoingSessionID;
  1381. enet_uint32 mtu, windowSize;
  1382. ENetChannel* channel;
  1383. size_t channelCount, duplicatePeers = 0;
  1384. ENetPeer* currentPeer, *peer = NULL;
  1385. ENetProtocol verifyCommand;
  1386. channelCount = ENET_NET_TO_HOST_32(command->connect.channelCount);
  1387. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  1388. return NULL;
  1389. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  1390. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED) {
  1391. if (peer == NULL)
  1392. peer = currentPeer;
  1393. } else if (currentPeer->state != ENET_PEER_STATE_CONNECTING && in6_equal(currentPeer->address.ipv6, host->receivedAddress.ipv6)) {
  1394. if (currentPeer->address.port == host->receivedAddress.port && currentPeer->connectID == command->connect.connectID)
  1395. return NULL;
  1396. ++duplicatePeers;
  1397. }
  1398. }
  1399. if (peer == NULL || duplicatePeers >= host->duplicatePeers)
  1400. return NULL;
  1401. if (channelCount > host->channelLimit)
  1402. channelCount = host->channelLimit;
  1403. peer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  1404. if (peer->channels == NULL)
  1405. return NULL;
  1406. peer->channelCount = channelCount;
  1407. peer->state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
  1408. peer->connectID = command->connect.connectID;
  1409. peer->address = host->receivedAddress;
  1410. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->connect.outgoingPeerID);
  1411. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->connect.incomingBandwidth);
  1412. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->connect.outgoingBandwidth);
  1413. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->connect.packetThrottleInterval);
  1414. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleAcceleration);
  1415. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleDeceleration);
  1416. peer->eventData = ENET_NET_TO_HOST_32(command->connect.data);
  1417. incomingSessionID = command->connect.incomingSessionID == 0xFF ? peer->outgoingSessionID : command->connect.incomingSessionID;
  1418. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1419. if (incomingSessionID == peer->outgoingSessionID)
  1420. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1421. peer->outgoingSessionID = incomingSessionID;
  1422. outgoingSessionID = command->connect.outgoingSessionID == 0xFF ? peer->incomingSessionID : command->connect.outgoingSessionID;
  1423. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1424. if (outgoingSessionID == peer->incomingSessionID)
  1425. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1426. peer->incomingSessionID = outgoingSessionID;
  1427. for (channel = peer->channels; channel < &peer->channels[channelCount]; ++channel) {
  1428. channel->outgoingReliableSequenceNumber = 0;
  1429. channel->outgoingUnreliableSequenceNumber = 0;
  1430. channel->incomingReliableSequenceNumber = 0;
  1431. channel->incomingUnreliableSequenceNumber = 0;
  1432. enet_list_clear(&channel->incomingReliableCommands);
  1433. enet_list_clear(&channel->incomingUnreliableCommands);
  1434. channel->usedReliableWindows = 0;
  1435. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  1436. }
  1437. mtu = ENET_NET_TO_HOST_32(command->connect.mtu);
  1438. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1439. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1440. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1441. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1442. peer->mtu = mtu;
  1443. if (host->outgoingBandwidth == 0 && peer->incomingBandwidth == 0)
  1444. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1445. else if (host->outgoingBandwidth == 0 || peer->incomingBandwidth == 0)
  1446. peer->windowSize = (ENET_MAX(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1447. else
  1448. peer->windowSize = (ENET_MIN(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1449. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1450. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1451. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1452. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1453. if (host->incomingBandwidth == 0)
  1454. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1455. else
  1456. windowSize = (host->incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1457. if (windowSize > ENET_NET_TO_HOST_32(command->connect.windowSize))
  1458. windowSize = ENET_NET_TO_HOST_32(command->connect.windowSize);
  1459. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1460. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1461. else if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1462. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1463. verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  1464. verifyCommand.header.channelID = 0xFF;
  1465. verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16(peer->incomingPeerID);
  1466. verifyCommand.verifyConnect.incomingSessionID = incomingSessionID;
  1467. verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID;
  1468. verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_32(peer->mtu);
  1469. verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32(windowSize);
  1470. verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  1471. verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  1472. verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  1473. verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32(peer->packetThrottleInterval);
  1474. verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(peer->packetThrottleAcceleration);
  1475. verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(peer->packetThrottleDeceleration);
  1476. verifyCommand.verifyConnect.connectID = peer->connectID;
  1477. enet_peer_queue_outgoing_command(peer, &verifyCommand, NULL, 0, 0);
  1478. return peer;
  1479. }
  1480. static int enet_protocol_handle_send_reliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1481. size_t dataLength;
  1482. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1483. ENET_LOG_ERROR("channel id is greater than the peer's channel count or the peer isn't in connected state and isn't pending disconnection later");
  1484. return -1;
  1485. }
  1486. dataLength = ENET_NET_TO_HOST_16(command->sendReliable.dataLength);
  1487. *currentData += dataLength;
  1488. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > & host->receivedData[host->receivedDataLength]) {
  1489. ENET_LOG_ERROR("data length is wacko");
  1490. return -1;
  1491. }
  1492. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendReliable), dataLength, ENET_PACKET_FLAG_RELIABLE, 0) == NULL) {
  1493. ENET_LOG_ERROR("Could not queue incoming command, it returned NULL");
  1494. return -1;
  1495. }
  1496. return 0;
  1497. }
  1498. static int enet_protocol_handle_send_unsequenced(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1499. enet_uint32 unsequencedGroup, index;
  1500. size_t dataLength;
  1501. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1502. ENET_LOG_ERROR("channel id is greater than the peer's channel count or the peer isn't in connected state and isn't pending disconnection later");
  1503. return -1;
  1504. }
  1505. dataLength = ENET_NET_TO_HOST_16(command->sendUnsequenced.dataLength);
  1506. *currentData += dataLength;
  1507. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength]) {
  1508. ENET_LOG_ERROR("data length is wacko");
  1509. return -1;
  1510. }
  1511. unsequencedGroup = ENET_NET_TO_HOST_16(command->sendUnsequenced.unsequencedGroup);
  1512. index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
  1513. if (unsequencedGroup < peer->incomingUnsequencedGroup)
  1514. unsequencedGroup += 0x10000;
  1515. if (unsequencedGroup >= (enet_uint32)peer->incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE)
  1516. return 0;
  1517. unsequencedGroup &= 0xFFFF;
  1518. if (unsequencedGroup - index != peer->incomingUnsequencedGroup) {
  1519. peer->incomingUnsequencedGroup = unsequencedGroup - index;
  1520. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  1521. } else if (peer->unsequencedWindow[index / 32] & (1 << (index % 32))) {
  1522. return 0;
  1523. }
  1524. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnsequenced), dataLength, ENET_PACKET_FLAG_UNSEQUENCED, 0) == NULL) {
  1525. ENET_LOG_ERROR("Could not queue incoming command, it returned NULL");
  1526. return -1;
  1527. }
  1528. peer->unsequencedWindow[index / 32] |= 1 << (index % 32);
  1529. return 0;
  1530. }
  1531. static int enet_protocol_handle_send_unreliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1532. size_t dataLength;
  1533. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1534. ENET_LOG_ERROR("channel id is greater than the peer's channel count or the peer isn't in connected state and isn't pending disconnection later");
  1535. return -1;
  1536. }
  1537. dataLength = ENET_NET_TO_HOST_16(command->sendUnreliable.dataLength);
  1538. *currentData += dataLength;
  1539. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength]) {
  1540. ENET_LOG_ERROR("data length is wacko");
  1541. return -1;
  1542. }
  1543. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnreliable), dataLength, 0, 0) == NULL) {
  1544. ENET_LOG_ERROR("Could not queue incoming command, it returned NULL");
  1545. return -1;
  1546. }
  1547. return 0;
  1548. }
  1549. static int enet_protocol_handle_send_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1550. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, startSequenceNumber, totalLength;
  1551. ENetChannel* channel;
  1552. enet_uint16 startWindow, currentWindow;
  1553. ENetListIterator currentCommand;
  1554. ENetIncomingCommand* startCommand = NULL;
  1555. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1556. ENET_LOG_ERROR("channel id is greater than the peer's channel count or the peer isn't in connected state and isn't pending disconnection later");
  1557. return -1;
  1558. }
  1559. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1560. *currentData += fragmentLength;
  1561. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength]) {
  1562. ENET_LOG_ERROR("data length is wacko");
  1563. return -1;
  1564. }
  1565. channel = &peer->channels[command->header.channelID];
  1566. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1567. startWindow = startSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1568. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1569. if (startSequenceNumber < channel->incomingReliableSequenceNumber)
  1570. startWindow += ENET_PEER_RELIABLE_WINDOWS;
  1571. if (startWindow < currentWindow || startWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1572. return 0;
  1573. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1574. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1575. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1576. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1577. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset) {
  1578. ENET_LOG_ERROR("Some fragment weirdness going on here");
  1579. return -1;
  1580. }
  1581. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1582. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1583. if (startSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1584. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1585. continue;
  1586. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1587. break;
  1588. }
  1589. if (incomingCommand->reliableSequenceNumber <= startSequenceNumber) {
  1590. if (incomingCommand->reliableSequenceNumber < startSequenceNumber)
  1591. break;
  1592. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount) {
  1593. ENET_LOG_ERROR("Some fragment weirdness going on here");
  1594. return -1;
  1595. }
  1596. startCommand = incomingCommand;
  1597. break;
  1598. }
  1599. }
  1600. if (startCommand == NULL) {
  1601. ENetProtocol hostCommand = *command;
  1602. hostCommand.header.reliableSequenceNumber = startSequenceNumber;
  1603. startCommand = enet_peer_queue_incoming_command(peer, &hostCommand, NULL, totalLength, ENET_PACKET_FLAG_RELIABLE, fragmentCount);
  1604. if (startCommand == NULL) {
  1605. ENET_LOG_ERROR("startCommand was NULL.");
  1606. return -1;
  1607. }
  1608. }
  1609. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1610. --startCommand->fragmentsRemaining;
  1611. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1612. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1613. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1614. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1615. if (startCommand->fragmentsRemaining <= 0)
  1616. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  1617. }
  1618. return 0;
  1619. }
  1620. static int enet_protocol_handle_send_unreliable_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1621. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, reliableSequenceNumber, startSequenceNumber, totalLength;
  1622. enet_uint16 reliableWindow, currentWindow;
  1623. ENetChannel* channel;
  1624. ENetListIterator currentCommand;
  1625. ENetIncomingCommand* startCommand = NULL;
  1626. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1627. ENET_LOG_ERROR("channel id is greater than the peer's channel count or the peer isn't in connected state and isn't pending disconnection later");
  1628. return -1;
  1629. }
  1630. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1631. *currentData += fragmentLength;
  1632. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > & host->receivedData[host->receivedDataLength]) {
  1633. ENET_LOG_ERROR("fragment data length is wacko");
  1634. return -1;
  1635. }
  1636. channel = &peer->channels[command->header.channelID];
  1637. reliableSequenceNumber = command->header.reliableSequenceNumber;
  1638. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1639. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1640. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1641. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1642. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  1643. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1644. return 0;
  1645. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && startSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  1646. return 0;
  1647. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1648. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1649. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1650. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1651. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset) {
  1652. ENET_LOG_ERROR("Exceeded maximum number of fragments, the total length is more than the packet size, the offset is out of bounds or the fragment is too big");
  1653. return -1;
  1654. }
  1655. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1656. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1657. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1658. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1659. continue;
  1660. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1661. break;
  1662. }
  1663. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  1664. break;
  1665. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  1666. continue;
  1667. if (incomingCommand->unreliableSequenceNumber <= startSequenceNumber) {
  1668. if (incomingCommand->unreliableSequenceNumber < startSequenceNumber)
  1669. break;
  1670. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount) {
  1671. ENET_LOG_ERROR("Some fragment weirdness going on here");
  1672. return -1;
  1673. }
  1674. startCommand = incomingCommand;
  1675. break;
  1676. }
  1677. }
  1678. if (startCommand == NULL) {
  1679. startCommand = enet_peer_queue_incoming_command(peer, command, NULL, totalLength,
  1680. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED, fragmentCount);
  1681. if (startCommand == NULL) {
  1682. ENET_LOG_ERROR("startCommand was NULL");
  1683. return -1;
  1684. }
  1685. }
  1686. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1687. --startCommand->fragmentsRemaining;
  1688. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1689. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1690. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1691. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1692. if (startCommand->fragmentsRemaining <= 0)
  1693. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  1694. }
  1695. return 0;
  1696. }
  1697. static int enet_protocol_handle_ping(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1698. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1699. ENET_LOG_ERROR("Doing jack squat on a peer that is not connected correctly");
  1700. return -1;
  1701. }
  1702. return 0;
  1703. }
  1704. static int enet_protocol_handle_bandwidth_limit(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1705. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1706. ENET_LOG_ERROR("Doing jack squat on a peer that is not connected correctly");
  1707. return -1;
  1708. }
  1709. if (peer->incomingBandwidth != 0)
  1710. --host->bandwidthLimitedPeers;
  1711. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.incomingBandwidth);
  1712. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.outgoingBandwidth);
  1713. if (peer->incomingBandwidth != 0)
  1714. ++host->bandwidthLimitedPeers;
  1715. if (peer->incomingBandwidth == 0 && host->outgoingBandwidth == 0)
  1716. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1717. else if (peer->incomingBandwidth == 0 || host->outgoingBandwidth == 0)
  1718. peer->windowSize = (ENET_MAX(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1719. else
  1720. peer->windowSize = (ENET_MIN(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1721. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1722. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1723. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1724. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1725. return 0;
  1726. }
  1727. static int enet_protocol_handle_throttle_configure(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1728. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1729. ENET_LOG_ERROR("Doing jack squat on a peer that is not connected correctly");
  1730. return -1;
  1731. }
  1732. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleInterval);
  1733. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleAcceleration);
  1734. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleDeceleration);
  1735. return 0;
  1736. }
  1737. static int enet_protocol_handle_disconnect(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1738. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT)
  1739. return 0;
  1740. enet_peer_reset_queues(peer);
  1741. if (peer->state == ENET_PEER_STATE_CONNECTION_SUCCEEDED || peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_CONNECTING) {
  1742. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1743. } else if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1744. if (peer->state == ENET_PEER_STATE_CONNECTION_PENDING)
  1745. host->recalculateBandwidthLimits = 1;
  1746. enet_peer_reset(peer);
  1747. } else if (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  1748. enet_protocol_change_state(host, peer, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT);
  1749. } else {
  1750. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1751. }
  1752. if (peer->state != ENET_PEER_STATE_DISCONNECTED)
  1753. peer->eventData = ENET_NET_TO_HOST_32(command->disconnect.data);
  1754. return 0;
  1755. }
  1756. static int enet_protocol_handle_acknowledge(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1757. enet_uint32 roundTripTime, receivedSentTime, receivedReliableSequenceNumber;
  1758. ENetProtocolCommand commandNumber;
  1759. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE)
  1760. return 0;
  1761. receivedSentTime = ENET_NET_TO_HOST_16(command->acknowledge.receivedSentTime);
  1762. receivedSentTime |= host->serviceTime & 0xFFFF0000;
  1763. if ((receivedSentTime & 0x8000) > (host->serviceTime & 0x8000))
  1764. receivedSentTime -= 0x10000;
  1765. if (ENET_TIME_LESS(host->serviceTime, receivedSentTime))
  1766. return 0;
  1767. peer->lastReceiveTime = host->serviceTime;
  1768. peer->earliestTimeout = 0;
  1769. roundTripTime = ENET_TIME_DIFFERENCE(host->serviceTime, receivedSentTime);
  1770. if (roundTripTime == 0)
  1771. roundTripTime = 1;
  1772. if (peer->smoothedRoundTripTime == 0)
  1773. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * ENET_SRTT_INITIAL + ENET_SRTT_PARA_G * roundTripTime);
  1774. else
  1775. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * peer->smoothedRoundTripTime + ENET_SRTT_PARA_G * roundTripTime);
  1776. enet_peer_throttle(peer, peer->smoothedRoundTripTime);
  1777. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1778. if (peer->smoothedRoundTripTime >= peer->roundTripTime) {
  1779. peer->roundTripTime += (peer->smoothedRoundTripTime - peer->roundTripTime) / 8;
  1780. peer->roundTripTimeVariance += (peer->smoothedRoundTripTime - peer->roundTripTime) / 4;
  1781. } else {
  1782. peer->roundTripTime -= (peer->roundTripTime - peer->smoothedRoundTripTime) / 8;
  1783. peer->roundTripTimeVariance += (peer->roundTripTime - peer->smoothedRoundTripTime) / 4;
  1784. }
  1785. if (peer->roundTripTime < peer->lowestRoundTripTime)
  1786. peer->lowestRoundTripTime = peer->roundTripTime;
  1787. if (peer->roundTripTimeVariance > peer->highestRoundTripTimeVariance)
  1788. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1789. if (peer->packetThrottleEpoch == 0 || ENET_TIME_DIFFERENCE(host->serviceTime, peer->packetThrottleEpoch) >= peer->packetThrottleInterval) {
  1790. peer->lastRoundTripTime = peer->lowestRoundTripTime;
  1791. peer->lastRoundTripTimeVariance = peer->highestRoundTripTimeVariance;
  1792. peer->lowestRoundTripTime = peer->roundTripTime;
  1793. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1794. peer->packetThrottleEpoch = host->serviceTime;
  1795. }
  1796. receivedReliableSequenceNumber = ENET_NET_TO_HOST_16(command->acknowledge.receivedReliableSequenceNumber);
  1797. commandNumber = enet_protocol_remove_sent_reliable_command(peer, receivedReliableSequenceNumber, command->header.channelID);
  1798. switch (peer->state) {
  1799. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1800. if (commandNumber != ENET_PROTOCOL_COMMAND_VERIFY_CONNECT) {
  1801. ENET_LOG_ERROR("Wrong command number. Got %u vs %u", commandNumber, ENET_PROTOCOL_COMMAND_VERIFY_CONNECT);
  1802. return -1;
  1803. }
  1804. enet_protocol_notify_connect(host, peer, event);
  1805. break;
  1806. case ENET_PEER_STATE_DISCONNECTING:
  1807. if (commandNumber != ENET_PROTOCOL_COMMAND_DISCONNECT) {
  1808. ENET_LOG_ERROR("Wrong command number. Got %u vs %u", commandNumber, ENET_PROTOCOL_COMMAND_DISCONNECT);
  1809. return -1;
  1810. }
  1811. enet_protocol_notify_disconnect(host, peer, event);
  1812. break;
  1813. case ENET_PEER_STATE_DISCONNECT_LATER:
  1814. if (enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1815. enet_peer_disconnect(peer, peer->eventData);
  1816. break;
  1817. default:
  1818. break;
  1819. }
  1820. return 0;
  1821. }
  1822. static int enet_protocol_handle_verify_connect(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1823. enet_uint32 mtu, windowSize;
  1824. size_t channelCount;
  1825. if (peer->state != ENET_PEER_STATE_CONNECTING)
  1826. return 0;
  1827. channelCount = ENET_NET_TO_HOST_32(command->verifyConnect.channelCount);
  1828. 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) {
  1829. peer->eventData = 0;
  1830. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1831. ENET_LOG_ERROR("A peer has entered a Zombie state...");
  1832. return -1;
  1833. }
  1834. enet_protocol_remove_sent_reliable_command(peer, 1, 0xFF);
  1835. if (channelCount < peer->channelCount)
  1836. peer->channelCount = channelCount;
  1837. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->verifyConnect.outgoingPeerID);
  1838. peer->incomingSessionID = command->verifyConnect.incomingSessionID;
  1839. peer->outgoingSessionID = command->verifyConnect.outgoingSessionID;
  1840. mtu = ENET_NET_TO_HOST_32(command->verifyConnect.mtu);
  1841. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1842. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1843. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1844. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1845. if (mtu < peer->mtu)
  1846. peer->mtu = mtu;
  1847. windowSize = ENET_NET_TO_HOST_32(command->verifyConnect.windowSize);
  1848. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1849. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1850. if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1851. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1852. if (windowSize < peer->windowSize)
  1853. peer->windowSize = windowSize;
  1854. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.incomingBandwidth);
  1855. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.outgoingBandwidth);
  1856. enet_protocol_notify_connect(host, peer, event);
  1857. return 0;
  1858. }
  1859. static int enet_protocol_handle_incoming_commands(ENetHost* host, ENetEvent* event) {
  1860. ENetProtocolHeader* header;
  1861. ENetProtocol* command;
  1862. ENetPeer* peer;
  1863. enet_uint8* currentData;
  1864. size_t headerSize;
  1865. enet_uint16 peerID, flags;
  1866. enet_uint8 sessionID;
  1867. if (host->receivedDataLength < (size_t)&((ENetProtocolHeader*)0)->sentTime)
  1868. return 0;
  1869. header = (ENetProtocolHeader*)host->receivedData;
  1870. peerID = ENET_NET_TO_HOST_16(header->peerID);
  1871. sessionID = (peerID & ENET_PROTOCOL_HEADER_SESSION_MASK) >> ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  1872. flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK;
  1873. peerID &= ~(ENET_PROTOCOL_HEADER_FLAG_MASK | ENET_PROTOCOL_HEADER_SESSION_MASK);
  1874. headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof(ENetProtocolHeader) : (size_t)&((ENetProtocolHeader*)0)->sentTime);
  1875. if (host->checksumCallback != NULL)
  1876. headerSize += sizeof(enet_uint32);
  1877. if (peerID == ENET_PROTOCOL_MAXIMUM_PEER_ID) {
  1878. peer = NULL;
  1879. } else if (peerID >= host->peerCount) {
  1880. return 0;
  1881. } else {
  1882. peer = &host->peers[peerID];
  1883. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || ((!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))
  1884. return 0;
  1885. }
  1886. #ifdef ENET_LZ4
  1887. if (flags & ENET_PROTOCOL_HEADER_FLAG_COMPRESSED) {
  1888. size_t originalSize = LZ4_decompress_safe((const char*)host->receivedData + headerSize, (char*)host->packetData[1] + headerSize, host->receivedDataLength - headerSize, sizeof(host->packetData[1]) - headerSize);
  1889. if (originalSize <= 0 || originalSize > sizeof(host->packetData[1]) - headerSize)
  1890. return 0;
  1891. memcpy(host->packetData[1], header, headerSize);
  1892. host->receivedData = host->packetData[1];
  1893. host->receivedDataLength = headerSize + originalSize;
  1894. }
  1895. #endif
  1896. if (host->checksumCallback != NULL) {
  1897. enet_uint32* checksum = (enet_uint32*)&host->receivedData[headerSize - sizeof(enet_uint32)];
  1898. enet_uint32 desiredChecksum = *checksum;
  1899. ENetBuffer buffer;
  1900. *checksum = peer != NULL ? peer->connectID : 0;
  1901. buffer.data = host->receivedData;
  1902. buffer.dataLength = host->receivedDataLength;
  1903. if (host->checksumCallback(&buffer, 1) != desiredChecksum)
  1904. return 0;
  1905. }
  1906. if (peer != NULL) {
  1907. peer->address.ipv6 = host->receivedAddress.ipv6;
  1908. peer->address.port = host->receivedAddress.port;
  1909. peer->incomingDataTotal += host->receivedDataLength;
  1910. peer->totalDataReceived += host->receivedDataLength;
  1911. }
  1912. currentData = host->receivedData + headerSize;
  1913. while (currentData < &host->receivedData[host->receivedDataLength]) {
  1914. enet_uint8 commandNumber;
  1915. size_t commandSize;
  1916. command = (ENetProtocol*)currentData;
  1917. if (currentData + sizeof(ENetProtocolCommandHeader) > &host->receivedData[host->receivedDataLength])
  1918. break;
  1919. commandNumber = command->header.command & ENET_PROTOCOL_COMMAND_MASK;
  1920. if (commandNumber >= ENET_PROTOCOL_COMMAND_COUNT)
  1921. break;
  1922. commandSize = commandSizes[commandNumber];
  1923. if (commandSize == 0 || currentData + commandSize > &host->receivedData[host->receivedDataLength])
  1924. break;
  1925. currentData += commandSize;
  1926. if (peer == NULL && (commandNumber != ENET_PROTOCOL_COMMAND_CONNECT || currentData < &host->receivedData[host->receivedDataLength]))
  1927. break;
  1928. command->header.reliableSequenceNumber = ENET_NET_TO_HOST_16(command->header.reliableSequenceNumber);
  1929. switch (commandNumber) {
  1930. case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE:
  1931. if (enet_protocol_handle_acknowledge(host, event, peer, command))
  1932. goto commandError;
  1933. break;
  1934. case ENET_PROTOCOL_COMMAND_CONNECT:
  1935. if (peer != NULL)
  1936. goto commandError;
  1937. if (host->preventConnections == 0) {
  1938. peer = enet_protocol_handle_connect(host, header, command);
  1939. if (peer == NULL)
  1940. goto commandError;
  1941. }
  1942. break;
  1943. case ENET_PROTOCOL_COMMAND_VERIFY_CONNECT:
  1944. if (enet_protocol_handle_verify_connect(host, event, peer, command))
  1945. goto commandError;
  1946. break;
  1947. case ENET_PROTOCOL_COMMAND_DISCONNECT:
  1948. if (enet_protocol_handle_disconnect(host, peer, command))
  1949. goto commandError;
  1950. break;
  1951. case ENET_PROTOCOL_COMMAND_PING:
  1952. if (enet_protocol_handle_ping(host, peer, command))
  1953. goto commandError;
  1954. break;
  1955. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  1956. if (enet_protocol_handle_send_reliable(host, peer, command, &currentData))
  1957. goto commandError;
  1958. break;
  1959. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  1960. if (enet_protocol_handle_send_unreliable(host, peer, command, &currentData))
  1961. goto commandError;
  1962. break;
  1963. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  1964. if (enet_protocol_handle_send_unsequenced(host, peer, command, &currentData))
  1965. goto commandError;
  1966. break;
  1967. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  1968. if (enet_protocol_handle_send_fragment(host, peer, command, &currentData))
  1969. goto commandError;
  1970. break;
  1971. case ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT:
  1972. if (enet_protocol_handle_bandwidth_limit(host, peer, command))
  1973. goto commandError;
  1974. break;
  1975. case ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE:
  1976. if (enet_protocol_handle_throttle_configure(host, peer, command))
  1977. goto commandError;
  1978. break;
  1979. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  1980. if (enet_protocol_handle_send_unreliable_fragment(host, peer, command, &currentData))
  1981. goto commandError;
  1982. break;
  1983. default:
  1984. goto commandError;
  1985. }
  1986. if (peer != NULL && (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0) {
  1987. enet_uint16 sentTime;
  1988. if (!(flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME))
  1989. break;
  1990. sentTime = ENET_NET_TO_HOST_16(header->sentTime);
  1991. switch (peer->state) {
  1992. case ENET_PEER_STATE_DISCONNECTING:
  1993. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1994. case ENET_PEER_STATE_DISCONNECTED:
  1995. case ENET_PEER_STATE_ZOMBIE:
  1996. break;
  1997. case ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT:
  1998. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  1999. enet_peer_queue_acknowledgement(peer, command, sentTime);
  2000. break;
  2001. default:
  2002. enet_peer_queue_acknowledgement(peer, command, sentTime);
  2003. break;
  2004. }
  2005. }
  2006. }
  2007. commandError:
  2008. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2009. return 1;
  2010. return 0;
  2011. }
  2012. static int enet_protocol_receive_incoming_commands(ENetHost* host, ENetEvent* event) {
  2013. int packets;
  2014. for (packets = 0; packets < 256; ++packets) {
  2015. int receivedLength;
  2016. ENetBuffer buffer;
  2017. buffer.data = host->packetData[0];
  2018. buffer.dataLength = host->mtu;
  2019. receivedLength = enet_socket_receive(host->socket, &host->receivedAddress, &buffer, 1);
  2020. if (receivedLength == -2)
  2021. continue;
  2022. if (receivedLength < 0) {
  2023. ENET_LOG_ERROR("received length was negative: %i", receivedLength);
  2024. return -1;
  2025. }
  2026. if (receivedLength == 0)
  2027. return 0;
  2028. host->receivedData = host->packetData[0];
  2029. host->receivedDataLength = receivedLength;
  2030. host->totalReceivedData += receivedLength;
  2031. host->totalReceivedPackets++;
  2032. if (host->interceptCallback != NULL) {
  2033. switch (host->interceptCallback(host, (void*)event)) {
  2034. case 1:
  2035. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2036. return 1;
  2037. continue;
  2038. case -1:
  2039. ENET_LOG_ERROR("intercept callback failure");
  2040. return -1;
  2041. default:
  2042. break;
  2043. }
  2044. }
  2045. switch (enet_protocol_handle_incoming_commands(host, event)) {
  2046. case 1:
  2047. return 1;
  2048. case -1:
  2049. ENET_LOG_ERROR("enet_protocol_handle_incoming_commands failure");
  2050. return -1;
  2051. default:
  2052. break;
  2053. }
  2054. }
  2055. return -1;
  2056. }
  2057. static void enet_protocol_send_acknowledgements(ENetHost* host, ENetPeer* peer) {
  2058. ENetProtocol* command = &host->commands[host->commandCount];
  2059. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2060. ENetAcknowledgement* acknowledgement;
  2061. ENetListIterator currentAcknowledgement;
  2062. enet_uint16 reliableSequenceNumber;
  2063. currentAcknowledgement = enet_list_begin(&peer->acknowledgements);
  2064. while (currentAcknowledgement != enet_list_end(&peer->acknowledgements)) {
  2065. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < sizeof(ENetProtocolAcknowledge)) {
  2066. host->continueSending = 1;
  2067. break;
  2068. }
  2069. acknowledgement = (ENetAcknowledgement*)currentAcknowledgement;
  2070. currentAcknowledgement = enet_list_next(currentAcknowledgement);
  2071. buffer->data = command;
  2072. buffer->dataLength = sizeof(ENetProtocolAcknowledge);
  2073. host->packetSize += buffer->dataLength;
  2074. reliableSequenceNumber = ENET_HOST_TO_NET_16(acknowledgement->command.header.reliableSequenceNumber);
  2075. command->header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
  2076. command->header.channelID = acknowledgement->command.header.channelID;
  2077. command->header.reliableSequenceNumber = reliableSequenceNumber;
  2078. command->acknowledge.receivedReliableSequenceNumber = reliableSequenceNumber;
  2079. command->acknowledge.receivedSentTime = ENET_HOST_TO_NET_16(acknowledgement->sentTime);
  2080. if ((acknowledgement->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2081. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  2082. enet_list_remove(&acknowledgement->acknowledgementList);
  2083. enet_free(acknowledgement);
  2084. ++command;
  2085. ++buffer;
  2086. }
  2087. host->commandCount = command - host->commands;
  2088. host->bufferCount = buffer - host->buffers;
  2089. }
  2090. static void enet_protocol_send_unreliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2091. ENetProtocol* command = &host->commands[host->commandCount];
  2092. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2093. ENetOutgoingCommand* outgoingCommand;
  2094. ENetListIterator currentCommand;
  2095. currentCommand = enet_list_begin(&peer->outgoingUnreliableCommands);
  2096. while (currentCommand != enet_list_end(&peer->outgoingUnreliableCommands)) {
  2097. size_t commandSize;
  2098. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2099. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2100. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer + 1 >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < commandSize || (outgoingCommand->packet != NULL && peer->mtu - host->packetSize < commandSize + outgoingCommand->fragmentLength)) {
  2101. host->continueSending = 1;
  2102. break;
  2103. }
  2104. currentCommand = enet_list_next(currentCommand);
  2105. if (outgoingCommand->packet != NULL && outgoingCommand->fragmentOffset == 0) {
  2106. peer->packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER;
  2107. peer->packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE;
  2108. if (peer->packetThrottleCounter > peer->packetThrottle) {
  2109. enet_uint16 reliableSequenceNumber = outgoingCommand->reliableSequenceNumber;
  2110. enet_uint16 unreliableSequenceNumber = outgoingCommand->unreliableSequenceNumber;
  2111. for (;;) {
  2112. --outgoingCommand->packet->referenceCount;
  2113. if (outgoingCommand->packet->referenceCount == 0)
  2114. enet_packet_destroy(outgoingCommand->packet);
  2115. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2116. enet_free(outgoingCommand);
  2117. if (currentCommand == enet_list_end(&peer->outgoingUnreliableCommands))
  2118. break;
  2119. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2120. if (outgoingCommand->reliableSequenceNumber != reliableSequenceNumber || outgoingCommand->unreliableSequenceNumber != unreliableSequenceNumber)
  2121. break;
  2122. currentCommand = enet_list_next(currentCommand);
  2123. }
  2124. continue;
  2125. }
  2126. }
  2127. buffer->data = command;
  2128. buffer->dataLength = commandSize;
  2129. host->packetSize += buffer->dataLength;
  2130. *command = outgoingCommand->command;
  2131. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2132. if (outgoingCommand->packet != NULL) {
  2133. ++buffer;
  2134. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2135. buffer->dataLength = outgoingCommand->fragmentLength;
  2136. host->packetSize += buffer->dataLength;
  2137. enet_list_insert(enet_list_end(&peer->sentUnreliableCommands), outgoingCommand);
  2138. } else {
  2139. enet_free(outgoingCommand);
  2140. }
  2141. ++command;
  2142. ++buffer;
  2143. }
  2144. host->commandCount = command - host->commands;
  2145. host->bufferCount = buffer - host->buffers;
  2146. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands) && enet_list_empty(&peer->sentUnreliableCommands))
  2147. enet_peer_disconnect(peer, peer->eventData);
  2148. }
  2149. static int enet_protocol_check_timeouts(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  2150. ENetOutgoingCommand* outgoingCommand;
  2151. ENetListIterator currentCommand, insertPosition;
  2152. currentCommand = enet_list_begin(&peer->sentReliableCommands);
  2153. insertPosition = enet_list_begin(&peer->outgoingReliableCommands);
  2154. while (currentCommand != enet_list_end(&peer->sentReliableCommands)) {
  2155. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2156. currentCommand = enet_list_next(currentCommand);
  2157. if (ENET_TIME_DIFFERENCE(host->serviceTime, outgoingCommand->sentTime) < outgoingCommand->roundTripTimeout)
  2158. continue;
  2159. if (peer->earliestTimeout == 0 || ENET_TIME_LESS(outgoingCommand->sentTime, peer->earliestTimeout))
  2160. peer->earliestTimeout = outgoingCommand->sentTime;
  2161. 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))) {
  2162. enet_protocol_notify_disconnect_timeout(host, peer, event);
  2163. return 1;
  2164. }
  2165. if (outgoingCommand->packet != NULL)
  2166. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  2167. ++peer->packetsLost;
  2168. ++peer->totalPacketsLost;
  2169. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2170. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2171. enet_list_insert(insertPosition, enet_list_remove(&outgoingCommand->outgoingCommandList));
  2172. if (currentCommand == enet_list_begin(&peer->sentReliableCommands) && !enet_list_empty(&peer->sentReliableCommands)) {
  2173. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2174. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  2175. }
  2176. }
  2177. return 0;
  2178. }
  2179. static int enet_protocol_send_reliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2180. ENetProtocol* command = &host->commands[host->commandCount];
  2181. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2182. ENetOutgoingCommand* outgoingCommand;
  2183. ENetListIterator currentCommand;
  2184. ENetChannel* channel;
  2185. enet_uint16 reliableWindow;
  2186. size_t commandSize;
  2187. int windowExceeded = 0, windowWrap = 0, canPing = 1;
  2188. currentCommand = enet_list_begin(&peer->outgoingReliableCommands);
  2189. while (currentCommand != enet_list_end(&peer->outgoingReliableCommands)) {
  2190. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2191. channel = outgoingCommand->command.header.channelID < peer->channelCount ? &peer->channels[outgoingCommand->command.header.channelID] : NULL;
  2192. reliableWindow = outgoingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2193. if (channel != NULL) {
  2194. if (!windowWrap && outgoingCommand->sendAttempts < 1 && !(outgoingCommand->reliableSequenceNumber % ENET_PEER_RELIABLE_WINDOW_SIZE) && (channel->reliableWindows[(reliableWindow + ENET_PEER_RELIABLE_WINDOWS - 1) % ENET_PEER_RELIABLE_WINDOWS] >= ENET_PEER_RELIABLE_WINDOW_SIZE || channel->usedReliableWindows & ((((1 << ENET_PEER_FREE_RELIABLE_WINDOWS) - 1) << reliableWindow) | (((1 << ENET_PEER_FREE_RELIABLE_WINDOWS) - 1) >> (ENET_PEER_RELIABLE_WINDOWS - reliableWindow)))))
  2195. windowWrap = 1;
  2196. if (windowWrap) {
  2197. currentCommand = enet_list_next(currentCommand);
  2198. continue;
  2199. }
  2200. }
  2201. if (outgoingCommand->packet != NULL) {
  2202. if (!windowExceeded) {
  2203. enet_uint32 windowSize = (peer->packetThrottle * peer->windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE;
  2204. if (peer->reliableDataInTransit + outgoingCommand->fragmentLength > ENET_MAX(windowSize, peer->mtu))
  2205. windowExceeded = 1;
  2206. }
  2207. if (windowExceeded) {
  2208. currentCommand = enet_list_next(currentCommand);
  2209. continue;
  2210. }
  2211. }
  2212. canPing = 0;
  2213. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2214. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer + 1 >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < commandSize || (outgoingCommand->packet != NULL && (enet_uint16)(peer->mtu - host->packetSize) < (enet_uint16)(commandSize + outgoingCommand->fragmentLength))) {
  2215. host->continueSending = 1;
  2216. break;
  2217. }
  2218. currentCommand = enet_list_next(currentCommand);
  2219. if (channel != NULL && outgoingCommand->sendAttempts < 1) {
  2220. channel->usedReliableWindows |= 1 << reliableWindow;
  2221. ++channel->reliableWindows[reliableWindow];
  2222. }
  2223. ++outgoingCommand->sendAttempts;
  2224. if (outgoingCommand->roundTripTimeout == 0) {
  2225. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2226. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2227. }
  2228. if (enet_list_empty(&peer->sentReliableCommands))
  2229. peer->nextTimeout = host->serviceTime + outgoingCommand->roundTripTimeout;
  2230. enet_list_insert(enet_list_end(&peer->sentReliableCommands), enet_list_remove(&outgoingCommand->outgoingCommandList));
  2231. outgoingCommand->sentTime = host->serviceTime;
  2232. buffer->data = command;
  2233. buffer->dataLength = commandSize;
  2234. host->packetSize += buffer->dataLength;
  2235. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_SENT_TIME;
  2236. *command = outgoingCommand->command;
  2237. if (outgoingCommand->packet != NULL) {
  2238. ++buffer;
  2239. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2240. buffer->dataLength = outgoingCommand->fragmentLength;
  2241. host->packetSize += outgoingCommand->fragmentLength;
  2242. peer->reliableDataInTransit += outgoingCommand->fragmentLength;
  2243. }
  2244. ++peer->packetsSent;
  2245. ++peer->totalPacketsSent;
  2246. ++command;
  2247. ++buffer;
  2248. }
  2249. host->commandCount = command - host->commands;
  2250. host->bufferCount = buffer - host->buffers;
  2251. return canPing;
  2252. }
  2253. static int enet_protocol_send_outgoing_commands(ENetHost* host, ENetEvent* event, int checkForTimeouts) {
  2254. enet_uint8 headerData[sizeof(ENetProtocolHeader) + sizeof(enet_uint32)];
  2255. ENetProtocolHeader* header = (ENetProtocolHeader*)headerData;
  2256. ENetPeer* currentPeer;
  2257. int sentLength;
  2258. host->continueSending = 1;
  2259. #ifdef ENET_LZ4
  2260. size_t shouldCompress = 0;
  2261. #endif
  2262. while (host->continueSending) {
  2263. for (host->continueSending = 0, currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2264. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED || currentPeer->state == ENET_PEER_STATE_ZOMBIE)
  2265. continue;
  2266. host->headerFlags = 0;
  2267. host->commandCount = 0;
  2268. host->bufferCount = 1;
  2269. host->packetSize = sizeof(ENetProtocolHeader);
  2270. if (!enet_list_empty(&currentPeer->acknowledgements))
  2271. enet_protocol_send_acknowledgements(host, currentPeer);
  2272. if (checkForTimeouts != 0 && !enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_GREATER_EQUAL(host->serviceTime, currentPeer->nextTimeout) && enet_protocol_check_timeouts(host, currentPeer, event) == 1) {
  2273. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2274. return 1;
  2275. else
  2276. continue;
  2277. }
  2278. if ((enet_list_empty(&currentPeer->outgoingReliableCommands) || enet_protocol_send_reliable_outgoing_commands(host, currentPeer)) && enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->lastReceiveTime) >= currentPeer->pingInterval && currentPeer->mtu - host->packetSize >= sizeof(ENetProtocolPing)) {
  2279. enet_peer_ping(currentPeer);
  2280. enet_protocol_send_reliable_outgoing_commands(host, currentPeer);
  2281. }
  2282. if (!enet_list_empty(&currentPeer->outgoingUnreliableCommands))
  2283. enet_protocol_send_unreliable_outgoing_commands(host, currentPeer);
  2284. if (host->commandCount == 0)
  2285. continue;
  2286. if (currentPeer->packetLossEpoch == 0) {
  2287. currentPeer->packetLossEpoch = host->serviceTime;
  2288. } else if (ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->packetLossEpoch) >= ENET_PEER_PACKET_LOSS_INTERVAL && currentPeer->packetsSent > 0) {
  2289. enet_uint32 packetLoss = currentPeer->packetsLost * ENET_PEER_PACKET_LOSS_SCALE / currentPeer->packetsSent;
  2290. ENET_LOG_TRACE(
  2291. "peer %u: %f%%+-%f%% packet loss, %u+-%u ms round trip time, %f%% throttle, %u/%u outgoing, %u/%u incoming\n", currentPeer->incomingPeerID,
  2292. currentPeer->packetLoss / (float)ENET_PEER_PACKET_LOSS_SCALE,
  2293. currentPeer->packetLossVariance / (float)ENET_PEER_PACKET_LOSS_SCALE, currentPeer->roundTripTime, currentPeer->roundTripTimeVariance,
  2294. currentPeer->packetThrottle / (float)ENET_PEER_PACKET_THROTTLE_SCALE,
  2295. enet_list_size(&currentPeer->outgoingReliableCommands),
  2296. enet_list_size(&currentPeer->outgoingUnreliableCommands),
  2297. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingReliableCommands) : 0,
  2298. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingUnreliableCommands) : 0
  2299. );
  2300. currentPeer->packetLossVariance -= currentPeer->packetLossVariance / 4;
  2301. if (packetLoss >= currentPeer->packetLoss) {
  2302. currentPeer->packetLoss += (packetLoss - currentPeer->packetLoss) / 8;
  2303. currentPeer->packetLossVariance += (packetLoss - currentPeer->packetLoss) / 4;
  2304. } else {
  2305. currentPeer->packetLoss -= (currentPeer->packetLoss - packetLoss) / 8;
  2306. currentPeer->packetLossVariance += (currentPeer->packetLoss - packetLoss) / 4;
  2307. }
  2308. currentPeer->packetLossEpoch = host->serviceTime;
  2309. currentPeer->packetsSent = 0;
  2310. currentPeer->packetsLost = 0;
  2311. }
  2312. host->buffers->data = headerData;
  2313. if (host->headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME) {
  2314. header->sentTime = ENET_HOST_TO_NET_16(host->serviceTime & 0xFFFF);
  2315. host->buffers->dataLength = sizeof(ENetProtocolHeader);
  2316. } else {
  2317. host->buffers->dataLength = (size_t)&((ENetProtocolHeader*)0)->sentTime;
  2318. }
  2319. #ifdef ENET_LZ4
  2320. if (host->compression == 1 && host->packetSize > 64) {
  2321. size_t originalSize = host->packetSize - sizeof(ENetProtocolHeader), compressedSize = 0;
  2322. const ENetBuffer* buffers = &host->buffers[1];
  2323. if (host->compressionBufferSize < originalSize) {
  2324. enet_free(host->compressionBuffer);
  2325. host->compressionBuffer = (char*)enet_malloc(originalSize);
  2326. host->compressionBufferSize = originalSize;
  2327. }
  2328. size_t totalSize = originalSize, dataSize = 0;
  2329. while (totalSize) {
  2330. size_t i;
  2331. for (i = 0; i < host->bufferCount - 1; i++) {
  2332. size_t copySize = ENET_MIN(totalSize, buffers[i].dataLength);
  2333. memcpy(host->compressionBuffer + dataSize, buffers[i].data, copySize);
  2334. totalSize -= copySize;
  2335. dataSize += copySize;
  2336. }
  2337. }
  2338. compressedSize = LZ4_compress_default((const char*)host->compressionBuffer, (char*)host->packetData[1], dataSize, originalSize);
  2339. if (compressedSize > 0 && compressedSize < originalSize) {
  2340. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_COMPRESSED;
  2341. shouldCompress = compressedSize;
  2342. ENET_LOG_TRACE("peer %u: compressed %u->%u (%u%%)\n", currentPeer->incomingPeerID, originalSize, compressedSize, (compressedSize * 100) / originalSize);
  2343. }
  2344. }
  2345. #endif
  2346. if (currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2347. host->headerFlags |= currentPeer->outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  2348. header->peerID = ENET_HOST_TO_NET_16(currentPeer->outgoingPeerID | host->headerFlags);
  2349. if (host->checksumCallback != NULL) {
  2350. enet_uint32* checksum = (enet_uint32*)&headerData[host->buffers->dataLength];
  2351. *checksum = currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer->connectID : 0;
  2352. host->buffers->dataLength += sizeof(enet_uint32);
  2353. *checksum = host->checksumCallback(host->buffers, host->bufferCount);
  2354. }
  2355. #ifdef ENET_LZ4
  2356. if (shouldCompress > 0) {
  2357. host->buffers[1].data = host->packetData[1];
  2358. host->buffers[1].dataLength = shouldCompress;
  2359. host->bufferCount = 2;
  2360. }
  2361. #endif
  2362. currentPeer->lastSendTime = host->serviceTime;
  2363. sentLength = enet_socket_send(host->socket, &currentPeer->address, host->buffers, host->bufferCount);
  2364. enet_protocol_remove_sent_unreliable_commands(currentPeer);
  2365. if (sentLength < 0) {
  2366. ENET_LOG_ERROR("sentLength was negative: %i", sentLength);
  2367. return -1;
  2368. }
  2369. host->totalSentData += sentLength;
  2370. currentPeer->totalDataSent += sentLength;
  2371. host->totalSentPackets++;
  2372. }
  2373. }
  2374. return 0;
  2375. }
  2376. void enet_host_flush(ENetHost* host) {
  2377. host->serviceTime = enet_time_get();
  2378. enet_protocol_send_outgoing_commands(host, NULL, 0);
  2379. }
  2380. int enet_host_check_events(ENetHost* host, ENetEvent* event) {
  2381. if (event == NULL)
  2382. // Coburn: Probably not needed to put debug here?
  2383. return -1;
  2384. event->type = ENET_EVENT_TYPE_NONE;
  2385. event->peer = NULL;
  2386. event->packet = NULL;
  2387. return enet_protocol_dispatch_incoming_commands(host, event);
  2388. }
  2389. int enet_host_service(ENetHost* host, ENetEvent* event, enet_uint32 timeout) {
  2390. enet_uint32 waitCondition;
  2391. if (event != NULL) {
  2392. event->type = ENET_EVENT_TYPE_NONE;
  2393. event->peer = NULL;
  2394. event->packet = NULL;
  2395. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2396. case 1:
  2397. return 1;
  2398. case -1:
  2399. ENET_LOG_ERROR("Error dispatching incoming packets");
  2400. return -1;
  2401. default:
  2402. break;
  2403. }
  2404. }
  2405. host->serviceTime = enet_time_get();
  2406. timeout += host->serviceTime;
  2407. do {
  2408. if (ENET_TIME_DIFFERENCE(host->serviceTime, host->bandwidthThrottleEpoch) >= ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  2409. enet_host_bandwidth_throttle(host);
  2410. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2411. case 1:
  2412. return 1;
  2413. case -1:
  2414. ENET_LOG_ERROR("Error sending outgoing packets");
  2415. return -1;
  2416. default:
  2417. break;
  2418. }
  2419. switch (enet_protocol_receive_incoming_commands(host, event)) {
  2420. case 1:
  2421. return 1;
  2422. case -1:
  2423. ENET_LOG_ERROR("Error receiving incoming packets");
  2424. return -1;
  2425. default:
  2426. break;
  2427. }
  2428. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2429. case 1:
  2430. return 1;
  2431. case -1:
  2432. ENET_LOG_ERROR("Error dispatching outgoing packets!");
  2433. return -1;
  2434. default:
  2435. break;
  2436. }
  2437. if (event != NULL) {
  2438. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2439. case 1:
  2440. return 1;
  2441. case -1:
  2442. ENET_LOG_ERROR("Error dispatching incoming packets!");
  2443. return -1;
  2444. default:
  2445. break;
  2446. }
  2447. }
  2448. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2449. return 0;
  2450. do {
  2451. host->serviceTime = enet_time_get();
  2452. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2453. return 0;
  2454. waitCondition = ENET_SOCKET_WAIT_RECEIVE | ENET_SOCKET_WAIT_INTERRUPT;
  2455. if (enet_socket_wait(host->socket, &waitCondition, ENET_TIME_DIFFERENCE(timeout, host->serviceTime)) != 0)
  2456. // Coburn: Is this an error?
  2457. return -1;
  2458. }
  2459. while (waitCondition & ENET_SOCKET_WAIT_INTERRUPT);
  2460. host->serviceTime = enet_time_get();
  2461. }
  2462. while (waitCondition & ENET_SOCKET_WAIT_RECEIVE);
  2463. return 0;
  2464. }
  2465. /*
  2466. =======================================================================
  2467. Peer
  2468. =======================================================================
  2469. */
  2470. void enet_peer_throttle_configure(ENetPeer* peer, enet_uint32 interval, enet_uint32 acceleration, enet_uint32 deceleration, enet_uint32 threshold) {
  2471. ENetProtocol command;
  2472. peer->packetThrottleThreshold = threshold;
  2473. peer->packetThrottleInterval = interval;
  2474. peer->packetThrottleAcceleration = acceleration;
  2475. peer->packetThrottleDeceleration = deceleration;
  2476. command.header.command = ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2477. command.header.channelID = 0xFF;
  2478. command.throttleConfigure.packetThrottleInterval = ENET_HOST_TO_NET_32(interval);
  2479. command.throttleConfigure.packetThrottleAcceleration = ENET_HOST_TO_NET_32(acceleration);
  2480. command.throttleConfigure.packetThrottleDeceleration = ENET_HOST_TO_NET_32(deceleration);
  2481. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2482. }
  2483. int enet_peer_throttle(ENetPeer* peer, enet_uint32 rtt) {
  2484. if (peer->lastRoundTripTime <= peer->lastRoundTripTimeVariance) {
  2485. peer->packetThrottle = peer->packetThrottleLimit;
  2486. } else if (rtt < peer->lastRoundTripTime) {
  2487. peer->packetThrottle += peer->packetThrottleAcceleration;
  2488. if (peer->packetThrottle > peer->packetThrottleLimit)
  2489. peer->packetThrottle = peer->packetThrottleLimit;
  2490. return 1;
  2491. } else if (rtt > peer->lastRoundTripTime + peer->packetThrottleThreshold + 2 * peer->lastRoundTripTimeVariance) {
  2492. if (peer->packetThrottle > peer->packetThrottleDeceleration)
  2493. peer->packetThrottle -= peer->packetThrottleDeceleration;
  2494. else
  2495. peer->packetThrottle = 0;
  2496. // Coburn: Not sure if this is an error condition
  2497. return -1;
  2498. }
  2499. return 0;
  2500. }
  2501. int enet_peer_send(ENetPeer* peer, enet_uint8 channelID, ENetPacket* packet) {
  2502. ENetChannel* channel = &peer->channels[channelID];
  2503. ENetProtocol command;
  2504. size_t fragmentLength;
  2505. if (peer->state != ENET_PEER_STATE_CONNECTED || channelID >= peer->channelCount || packet->dataLength > peer->host->maximumPacketSize) {
  2506. ENET_LOG_ERROR("Cannot send data. Peer is not connected, the channel id is above the maximum channels supported or the packet data length is above the maximum packet size");
  2507. return -1;
  2508. }
  2509. fragmentLength = peer->mtu - sizeof(ENetProtocolHeader) - sizeof(ENetProtocolSendFragment);
  2510. if (peer->host->checksumCallback != NULL)
  2511. fragmentLength -= sizeof(enet_uint32);
  2512. if (packet->dataLength > fragmentLength) {
  2513. enet_uint32 fragmentCount = (packet->dataLength + fragmentLength - 1) / fragmentLength, fragmentNumber, fragmentOffset;
  2514. enet_uint8 commandNumber;
  2515. enet_uint16 startSequenceNumber;
  2516. ENetList fragments;
  2517. ENetOutgoingCommand* fragment;
  2518. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT) {
  2519. ENET_LOG_ERROR("Cannot send data. Too many fragments (%u vs %u)", fragmentCount, ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT);
  2520. return -1;
  2521. }
  2522. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED)) == ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED && channel->outgoingUnreliableSequenceNumber < 0xFFFF) {
  2523. commandNumber = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT;
  2524. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingUnreliableSequenceNumber + 1);
  2525. } else {
  2526. commandNumber = ENET_PROTOCOL_COMMAND_SEND_FRAGMENT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2527. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingReliableSequenceNumber + 1);
  2528. }
  2529. enet_list_clear(&fragments);
  2530. for (fragmentNumber = 0, fragmentOffset = 0; fragmentOffset < packet->dataLength; ++fragmentNumber, fragmentOffset += fragmentLength) {
  2531. if (packet->dataLength - fragmentOffset < fragmentLength)
  2532. fragmentLength = packet->dataLength - fragmentOffset;
  2533. fragment = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2534. if (fragment == NULL) {
  2535. while (!enet_list_empty(&fragments)) {
  2536. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2537. enet_free(fragment);
  2538. }
  2539. ENET_LOG_ERROR("Cannot send data. A fragment was null.");
  2540. return -1;
  2541. }
  2542. fragment->fragmentOffset = fragmentOffset;
  2543. fragment->fragmentLength = fragmentLength;
  2544. fragment->packet = packet;
  2545. fragment->command.header.command = commandNumber;
  2546. fragment->command.header.channelID = channelID;
  2547. fragment->command.sendFragment.startSequenceNumber = startSequenceNumber;
  2548. fragment->command.sendFragment.dataLength = ENET_HOST_TO_NET_16(fragmentLength);
  2549. fragment->command.sendFragment.fragmentCount = ENET_HOST_TO_NET_32(fragmentCount);
  2550. fragment->command.sendFragment.fragmentNumber = ENET_HOST_TO_NET_32(fragmentNumber);
  2551. fragment->command.sendFragment.totalLength = ENET_HOST_TO_NET_32(packet->dataLength);
  2552. fragment->command.sendFragment.fragmentOffset = ENET_NET_TO_HOST_32(fragmentOffset);
  2553. enet_list_insert(enet_list_end(&fragments), fragment);
  2554. }
  2555. packet->referenceCount += fragmentNumber;
  2556. while (!enet_list_empty(&fragments)) {
  2557. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2558. enet_peer_setup_outgoing_command(peer, fragment);
  2559. }
  2560. return 0;
  2561. }
  2562. command.header.channelID = channelID;
  2563. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNSEQUENCED)) == ENET_PACKET_FLAG_UNSEQUENCED) {
  2564. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2565. command.sendUnsequenced.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2566. } else if (packet->flags & ENET_PACKET_FLAG_RELIABLE || channel->outgoingUnreliableSequenceNumber >= 0xFFFF) {
  2567. command.header.command = ENET_PROTOCOL_COMMAND_SEND_RELIABLE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2568. command.sendReliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2569. } else {
  2570. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE;
  2571. command.sendUnreliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2572. }
  2573. if (enet_peer_queue_outgoing_command(peer, &command, packet, 0, packet->dataLength) == NULL) {
  2574. ENET_LOG_ERROR("a queued outgoing command was NULL");
  2575. return -1;
  2576. }
  2577. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  2578. enet_host_flush(peer->host);
  2579. return 0;
  2580. }
  2581. ENetPacket* enet_peer_receive(ENetPeer* peer, enet_uint8* channelID) {
  2582. ENetIncomingCommand* incomingCommand;
  2583. ENetPacket* packet;
  2584. if (enet_list_empty(&peer->dispatchedCommands))
  2585. return NULL;
  2586. incomingCommand = (ENetIncomingCommand*)enet_list_remove(enet_list_begin(&peer->dispatchedCommands));
  2587. if (channelID != NULL)
  2588. *channelID = incomingCommand->command.header.channelID;
  2589. packet = incomingCommand->packet;
  2590. --packet->referenceCount;
  2591. if (incomingCommand->fragments != NULL)
  2592. enet_free(incomingCommand->fragments);
  2593. enet_free(incomingCommand);
  2594. peer->totalWaitingData -= packet->dataLength;
  2595. return packet;
  2596. }
  2597. static void enet_peer_reset_outgoing_commands(ENetList* queue) {
  2598. ENetOutgoingCommand* outgoingCommand;
  2599. while (!enet_list_empty(queue)) {
  2600. outgoingCommand = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(queue));
  2601. if (outgoingCommand->packet != NULL) {
  2602. --outgoingCommand->packet->referenceCount;
  2603. if (outgoingCommand->packet->referenceCount == 0)
  2604. enet_packet_destroy(outgoingCommand->packet);
  2605. }
  2606. enet_free(outgoingCommand);
  2607. }
  2608. }
  2609. static void enet_peer_remove_incoming_commands(ENetList* queue, ENetListIterator startCommand, ENetListIterator endCommand) {
  2610. ENetListIterator currentCommand;
  2611. for (currentCommand = startCommand; currentCommand != endCommand;) {
  2612. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2613. currentCommand = enet_list_next(currentCommand);
  2614. enet_list_remove(&incomingCommand->incomingCommandList);
  2615. if (incomingCommand->packet != NULL) {
  2616. --incomingCommand->packet->referenceCount;
  2617. if (incomingCommand->packet->referenceCount == 0)
  2618. enet_packet_destroy(incomingCommand->packet);
  2619. }
  2620. if (incomingCommand->fragments != NULL)
  2621. enet_free(incomingCommand->fragments);
  2622. enet_free(incomingCommand);
  2623. }
  2624. }
  2625. static void enet_peer_reset_incoming_commands(ENetList* queue) {
  2626. enet_peer_remove_incoming_commands(queue, enet_list_begin(queue), enet_list_end(queue));
  2627. }
  2628. void enet_peer_reset_queues(ENetPeer* peer) {
  2629. ENetChannel* channel;
  2630. if (peer->needsDispatch) {
  2631. enet_list_remove(&peer->dispatchList);
  2632. peer->needsDispatch = 0;
  2633. }
  2634. while (!enet_list_empty(&peer->acknowledgements)) {
  2635. enet_free(enet_list_remove(enet_list_begin(&peer->acknowledgements)));
  2636. }
  2637. enet_peer_reset_outgoing_commands(&peer->sentReliableCommands);
  2638. enet_peer_reset_outgoing_commands(&peer->sentUnreliableCommands);
  2639. enet_peer_reset_outgoing_commands(&peer->outgoingReliableCommands);
  2640. enet_peer_reset_outgoing_commands(&peer->outgoingUnreliableCommands);
  2641. enet_peer_reset_incoming_commands(&peer->dispatchedCommands);
  2642. if (peer->channels != NULL && peer->channelCount > 0) {
  2643. for (channel = peer->channels; channel < &peer->channels[peer->channelCount]; ++channel) {
  2644. enet_peer_reset_incoming_commands(&channel->incomingReliableCommands);
  2645. enet_peer_reset_incoming_commands(&channel->incomingUnreliableCommands);
  2646. }
  2647. enet_free(peer->channels);
  2648. }
  2649. peer->channels = NULL;
  2650. peer->channelCount = 0;
  2651. }
  2652. void enet_peer_on_connect(ENetPeer* peer) {
  2653. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  2654. if (peer->incomingBandwidth != 0)
  2655. ++peer->host->bandwidthLimitedPeers;
  2656. ++peer->host->connectedPeers;
  2657. }
  2658. }
  2659. void enet_peer_on_disconnect(ENetPeer* peer) {
  2660. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2661. if (peer->incomingBandwidth != 0)
  2662. --peer->host->bandwidthLimitedPeers;
  2663. --peer->host->connectedPeers;
  2664. }
  2665. }
  2666. void enet_peer_reset(ENetPeer* peer) {
  2667. enet_peer_on_disconnect(peer);
  2668. peer->outgoingPeerID = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  2669. peer->state = ENET_PEER_STATE_DISCONNECTED;
  2670. peer->incomingBandwidth = 0;
  2671. peer->outgoingBandwidth = 0;
  2672. peer->incomingBandwidthThrottleEpoch = 0;
  2673. peer->outgoingBandwidthThrottleEpoch = 0;
  2674. peer->incomingDataTotal = 0;
  2675. peer->totalDataReceived = 0;
  2676. peer->outgoingDataTotal = 0;
  2677. peer->totalDataSent = 0;
  2678. peer->lastSendTime = 0;
  2679. peer->lastReceiveTime = 0;
  2680. peer->nextTimeout = 0;
  2681. peer->earliestTimeout = 0;
  2682. peer->packetLossEpoch = 0;
  2683. peer->packetsSent = 0;
  2684. peer->totalPacketsSent = 0;
  2685. peer->packetsLost = 0;
  2686. peer->totalPacketsLost = 0;
  2687. peer->packetLoss = 0;
  2688. peer->packetLossVariance = 0;
  2689. peer->packetThrottle = ENET_PEER_DEFAULT_PACKET_THROTTLE;
  2690. peer->packetThrottleLimit = ENET_PEER_PACKET_THROTTLE_SCALE;
  2691. peer->packetThrottleCounter = 0;
  2692. peer->packetThrottleEpoch = 0;
  2693. peer->packetThrottleAcceleration = ENET_PEER_PACKET_THROTTLE_ACCELERATION;
  2694. peer->packetThrottleDeceleration = ENET_PEER_PACKET_THROTTLE_DECELERATION;
  2695. peer->packetThrottleInterval = ENET_PEER_PACKET_THROTTLE_INTERVAL;
  2696. peer->pingInterval = ENET_PEER_PING_INTERVAL;
  2697. peer->timeoutLimit = ENET_PEER_TIMEOUT_LIMIT;
  2698. peer->timeoutMinimum = ENET_PEER_TIMEOUT_MINIMUM;
  2699. peer->timeoutMaximum = ENET_PEER_TIMEOUT_MAXIMUM;
  2700. peer->smoothedRoundTripTime = 0;
  2701. peer->lastRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2702. peer->lowestRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2703. peer->lastRoundTripTimeVariance = 0;
  2704. peer->highestRoundTripTimeVariance = 0;
  2705. peer->roundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2706. peer->roundTripTimeVariance = 0;
  2707. peer->mtu = peer->host->mtu;
  2708. peer->reliableDataInTransit = 0;
  2709. peer->outgoingReliableSequenceNumber = 0;
  2710. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  2711. peer->incomingUnsequencedGroup = 0;
  2712. peer->outgoingUnsequencedGroup = 0;
  2713. peer->eventData = 0;
  2714. peer->totalWaitingData = 0;
  2715. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  2716. enet_peer_reset_queues(peer);
  2717. }
  2718. void enet_peer_ping(ENetPeer* peer) {
  2719. ENetProtocol command;
  2720. if (peer->state != ENET_PEER_STATE_CONNECTED)
  2721. return;
  2722. command.header.command = ENET_PROTOCOL_COMMAND_PING | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2723. command.header.channelID = 0xFF;
  2724. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2725. }
  2726. void enet_peer_ping_interval(ENetPeer* peer, enet_uint32 pingInterval) {
  2727. peer->pingInterval = pingInterval ? pingInterval : ENET_PEER_PING_INTERVAL;
  2728. }
  2729. void enet_peer_timeout(ENetPeer* peer, enet_uint32 timeoutLimit, enet_uint32 timeoutMinimum, enet_uint32 timeoutMaximum) {
  2730. peer->timeoutLimit = timeoutLimit ? timeoutLimit : ENET_PEER_TIMEOUT_LIMIT;
  2731. peer->timeoutMinimum = timeoutMinimum ? timeoutMinimum : ENET_PEER_TIMEOUT_MINIMUM;
  2732. peer->timeoutMaximum = timeoutMaximum ? timeoutMaximum : ENET_PEER_TIMEOUT_MAXIMUM;
  2733. }
  2734. void enet_peer_disconnect_now(ENetPeer* peer, enet_uint32 data) {
  2735. ENetProtocol command;
  2736. if (peer->state == ENET_PEER_STATE_DISCONNECTED)
  2737. return;
  2738. if (peer->state != ENET_PEER_STATE_ZOMBIE && peer->state != ENET_PEER_STATE_DISCONNECTING) {
  2739. enet_peer_reset_queues(peer);
  2740. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2741. command.header.channelID = 0xFF;
  2742. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2743. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2744. enet_host_flush(peer->host);
  2745. }
  2746. enet_peer_reset(peer);
  2747. }
  2748. void enet_peer_disconnect(ENetPeer* peer, enet_uint32 data) {
  2749. ENetProtocol command;
  2750. 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)
  2751. return;
  2752. enet_peer_reset_queues(peer);
  2753. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT;
  2754. command.header.channelID = 0xFF;
  2755. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2756. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2757. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2758. else
  2759. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2760. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2761. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2762. enet_peer_on_disconnect(peer);
  2763. peer->state = ENET_PEER_STATE_DISCONNECTING;
  2764. } else {
  2765. enet_host_flush(peer->host);
  2766. enet_peer_reset(peer);
  2767. }
  2768. }
  2769. void enet_peer_disconnect_later(ENetPeer* peer, enet_uint32 data) {
  2770. if ((peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) && !(enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))) {
  2771. peer->state = ENET_PEER_STATE_DISCONNECT_LATER;
  2772. peer->eventData = data;
  2773. } else {
  2774. enet_peer_disconnect(peer, data);
  2775. }
  2776. }
  2777. ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer* peer, const ENetProtocol* command, enet_uint16 sentTime) {
  2778. ENetAcknowledgement* acknowledgement;
  2779. if (command->header.channelID < peer->channelCount) {
  2780. ENetChannel* channel = &peer->channels[command->header.channelID];
  2781. enet_uint16 reliableWindow = command->header.reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2782. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2783. if (command->header.reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2784. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2785. if (reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1 && reliableWindow <= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS)
  2786. return NULL;
  2787. }
  2788. acknowledgement = (ENetAcknowledgement*)enet_malloc(sizeof(ENetAcknowledgement));
  2789. if (acknowledgement == NULL)
  2790. return NULL;
  2791. peer->outgoingDataTotal += sizeof(ENetProtocolAcknowledge);
  2792. acknowledgement->sentTime = sentTime;
  2793. acknowledgement->command = *command;
  2794. enet_list_insert(enet_list_end(&peer->acknowledgements), acknowledgement);
  2795. return acknowledgement;
  2796. }
  2797. void enet_peer_setup_outgoing_command(ENetPeer* peer, ENetOutgoingCommand* outgoingCommand) {
  2798. ENetChannel* channel = &peer->channels[outgoingCommand->command.header.channelID];
  2799. peer->outgoingDataTotal += enet_protocol_command_size(outgoingCommand->command.header.command) + outgoingCommand->fragmentLength;
  2800. if (outgoingCommand->command.header.channelID == 0xFF) {
  2801. ++peer->outgoingReliableSequenceNumber;
  2802. outgoingCommand->reliableSequenceNumber = peer->outgoingReliableSequenceNumber;
  2803. outgoingCommand->unreliableSequenceNumber = 0;
  2804. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2805. ++channel->outgoingReliableSequenceNumber;
  2806. channel->outgoingUnreliableSequenceNumber = 0;
  2807. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2808. outgoingCommand->unreliableSequenceNumber = 0;
  2809. } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED) {
  2810. ++peer->outgoingUnsequencedGroup;
  2811. outgoingCommand->reliableSequenceNumber = 0;
  2812. outgoingCommand->unreliableSequenceNumber = 0;
  2813. } else {
  2814. if (outgoingCommand->fragmentOffset == 0)
  2815. ++channel->outgoingUnreliableSequenceNumber;
  2816. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2817. outgoingCommand->unreliableSequenceNumber = channel->outgoingUnreliableSequenceNumber;
  2818. }
  2819. outgoingCommand->sendAttempts = 0;
  2820. outgoingCommand->sentTime = 0;
  2821. outgoingCommand->roundTripTimeout = 0;
  2822. outgoingCommand->roundTripTimeoutLimit = 0;
  2823. outgoingCommand->command.header.reliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->reliableSequenceNumber);
  2824. switch (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2825. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2826. outgoingCommand->command.sendUnreliable.unreliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->unreliableSequenceNumber);
  2827. break;
  2828. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2829. outgoingCommand->command.sendUnsequenced.unsequencedGroup = ENET_HOST_TO_NET_16(peer->outgoingUnsequencedGroup);
  2830. break;
  2831. default:
  2832. break;
  2833. }
  2834. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)
  2835. enet_list_insert(enet_list_end(&peer->outgoingReliableCommands), outgoingCommand);
  2836. else
  2837. enet_list_insert(enet_list_end(&peer->outgoingUnreliableCommands), outgoingCommand);
  2838. }
  2839. ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer* peer, const ENetProtocol* command, ENetPacket* packet, enet_uint32 offset, enet_uint16 length) {
  2840. ENetOutgoingCommand* outgoingCommand = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2841. if (outgoingCommand == NULL)
  2842. return NULL;
  2843. outgoingCommand->command = *command;
  2844. outgoingCommand->fragmentOffset = offset;
  2845. outgoingCommand->fragmentLength = length;
  2846. outgoingCommand->packet = packet;
  2847. if (packet != NULL)
  2848. ++packet->referenceCount;
  2849. enet_peer_setup_outgoing_command(peer, outgoingCommand);
  2850. return outgoingCommand;
  2851. }
  2852. void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2853. ENetListIterator droppedCommand, startCommand, currentCommand;
  2854. for (droppedCommand = startCommand = currentCommand = enet_list_begin(&channel->incomingUnreliableCommands); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2855. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2856. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2857. continue;
  2858. if (incomingCommand->reliableSequenceNumber == channel->incomingReliableSequenceNumber) {
  2859. if (incomingCommand->fragmentsRemaining <= 0) {
  2860. channel->incomingUnreliableSequenceNumber = incomingCommand->unreliableSequenceNumber;
  2861. continue;
  2862. }
  2863. if (startCommand != currentCommand) {
  2864. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2865. if (!peer->needsDispatch) {
  2866. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2867. peer->needsDispatch = 1;
  2868. }
  2869. droppedCommand = currentCommand;
  2870. } else if (droppedCommand != currentCommand)
  2871. droppedCommand = enet_list_previous(currentCommand);
  2872. } else {
  2873. enet_uint16 reliableWindow = incomingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2874. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2875. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2876. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2877. if (reliableWindow >= currentWindow && reliableWindow < currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2878. break;
  2879. droppedCommand = enet_list_next(currentCommand);
  2880. if (startCommand != currentCommand) {
  2881. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2882. if (!peer->needsDispatch) {
  2883. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2884. peer->needsDispatch = 1;
  2885. }
  2886. }
  2887. }
  2888. startCommand = enet_list_next(currentCommand);
  2889. }
  2890. if (startCommand != currentCommand) {
  2891. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2892. if (!peer->needsDispatch) {
  2893. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2894. peer->needsDispatch = 1;
  2895. }
  2896. droppedCommand = currentCommand;
  2897. }
  2898. enet_peer_remove_incoming_commands(&channel->incomingUnreliableCommands, enet_list_begin(&channel->incomingUnreliableCommands), droppedCommand);
  2899. }
  2900. void enet_peer_dispatch_incoming_reliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2901. ENetListIterator currentCommand;
  2902. for (currentCommand = enet_list_begin(&channel->incomingReliableCommands); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2903. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2904. if (incomingCommand->fragmentsRemaining > 0 || incomingCommand->reliableSequenceNumber != (enet_uint16)(channel->incomingReliableSequenceNumber + 1))
  2905. break;
  2906. channel->incomingReliableSequenceNumber = incomingCommand->reliableSequenceNumber;
  2907. if (incomingCommand->fragmentCount > 0)
  2908. channel->incomingReliableSequenceNumber += incomingCommand->fragmentCount - 1;
  2909. }
  2910. if (currentCommand == enet_list_begin(&channel->incomingReliableCommands))
  2911. return;
  2912. channel->incomingUnreliableSequenceNumber = 0;
  2913. enet_list_move(enet_list_end(&peer->dispatchedCommands), enet_list_begin(&channel->incomingReliableCommands), enet_list_previous(currentCommand));
  2914. if (!peer->needsDispatch) {
  2915. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2916. peer->needsDispatch = 1;
  2917. }
  2918. if (!enet_list_empty(&channel->incomingUnreliableCommands))
  2919. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2920. }
  2921. ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer* peer, const ENetProtocol* command, const void* data, size_t dataLength, enet_uint32 flags, enet_uint32 fragmentCount) {
  2922. static ENetIncomingCommand dummyCommand;
  2923. ENetChannel* channel = &peer->channels[command->header.channelID];
  2924. enet_uint32 unreliableSequenceNumber = 0, reliableSequenceNumber = 0;
  2925. enet_uint16 reliableWindow, currentWindow;
  2926. ENetIncomingCommand* incomingCommand;
  2927. ENetListIterator currentCommand;
  2928. ENetPacket* packet = NULL;
  2929. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2930. goto discardCommand;
  2931. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) {
  2932. reliableSequenceNumber = command->header.reliableSequenceNumber;
  2933. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2934. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2935. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2936. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2937. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2938. goto discardCommand;
  2939. }
  2940. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2941. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2942. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2943. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber)
  2944. goto discardCommand;
  2945. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2946. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2947. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2948. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2949. continue;
  2950. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2951. break;
  2952. }
  2953. if (incomingCommand->reliableSequenceNumber <= reliableSequenceNumber) {
  2954. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2955. break;
  2956. goto discardCommand;
  2957. }
  2958. }
  2959. break;
  2960. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2961. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  2962. unreliableSequenceNumber = ENET_NET_TO_HOST_16(command->sendUnreliable.unreliableSequenceNumber);
  2963. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && unreliableSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  2964. goto discardCommand;
  2965. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2966. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2967. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2968. continue;
  2969. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2970. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2971. continue;
  2972. } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2973. break;
  2974. }
  2975. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2976. break;
  2977. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  2978. continue;
  2979. if (incomingCommand->unreliableSequenceNumber <= unreliableSequenceNumber) {
  2980. if (incomingCommand->unreliableSequenceNumber < unreliableSequenceNumber)
  2981. break;
  2982. goto discardCommand;
  2983. }
  2984. }
  2985. break;
  2986. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2987. currentCommand = enet_list_end(&channel->incomingUnreliableCommands);
  2988. break;
  2989. default:
  2990. goto discardCommand;
  2991. }
  2992. if (peer->totalWaitingData >= peer->host->maximumWaitingData)
  2993. goto notifyError;
  2994. packet = enet_packet_create(data, dataLength, flags);
  2995. if (packet == NULL)
  2996. goto notifyError;
  2997. incomingCommand = (ENetIncomingCommand*)enet_malloc(sizeof(ENetIncomingCommand));
  2998. if (incomingCommand == NULL)
  2999. goto notifyError;
  3000. incomingCommand->reliableSequenceNumber = command->header.reliableSequenceNumber;
  3001. incomingCommand->unreliableSequenceNumber = unreliableSequenceNumber & 0xFFFF;
  3002. incomingCommand->command = *command;
  3003. incomingCommand->fragmentCount = fragmentCount;
  3004. incomingCommand->fragmentsRemaining = fragmentCount;
  3005. incomingCommand->packet = packet;
  3006. incomingCommand->fragments = NULL;
  3007. if (fragmentCount > 0) {
  3008. if (fragmentCount <= ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  3009. incomingCommand->fragments = (enet_uint32*)enet_malloc((fragmentCount + 31) / 32 * sizeof(enet_uint32));
  3010. if (incomingCommand->fragments == NULL) {
  3011. enet_free(incomingCommand);
  3012. goto notifyError;
  3013. }
  3014. memset(incomingCommand->fragments, 0, (fragmentCount + 31) / 32 * sizeof(enet_uint32));
  3015. }
  3016. if (packet != NULL) {
  3017. ++packet->referenceCount;
  3018. peer->totalWaitingData += packet->dataLength;
  3019. }
  3020. enet_list_insert(enet_list_next(currentCommand), incomingCommand);
  3021. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  3022. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  3023. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  3024. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  3025. break;
  3026. default:
  3027. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  3028. break;
  3029. }
  3030. return incomingCommand;
  3031. discardCommand:
  3032. if (fragmentCount > 0)
  3033. goto notifyError;
  3034. if (packet != NULL && packet->referenceCount == 0)
  3035. enet_packet_destroy(packet);
  3036. return &dummyCommand;
  3037. notifyError:
  3038. if (packet != NULL && packet->referenceCount == 0)
  3039. enet_packet_destroy(packet);
  3040. return NULL;
  3041. }
  3042. /*
  3043. =======================================================================
  3044. Host
  3045. =======================================================================
  3046. */
  3047. ENetHost* enet_host_create(const ENetAddress* address, size_t peerCount, size_t channelLimit, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth, int bufferSize) {
  3048. ENetHost* host;
  3049. ENetPeer* currentPeer;
  3050. if (peerCount > ENET_PROTOCOL_MAXIMUM_PEER_ID)
  3051. return NULL;
  3052. host = (ENetHost*)enet_malloc(sizeof(ENetHost));
  3053. if (host == NULL)
  3054. return NULL;
  3055. memset(host, 0, sizeof(ENetHost));
  3056. host->peers = (ENetPeer*)enet_malloc(peerCount * sizeof(ENetPeer));
  3057. if (host->peers == NULL) {
  3058. enet_free(host);
  3059. return NULL;
  3060. }
  3061. memset(host->peers, 0, peerCount * sizeof(ENetPeer));
  3062. host->socket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
  3063. if (host->socket != ENET_SOCKET_NULL)
  3064. enet_socket_set_option(host->socket, ENET_SOCKOPT_IPV6_V6ONLY, 0);
  3065. if (host->socket == ENET_SOCKET_NULL || (address != NULL && enet_socket_bind(host->socket, address) < 0)) {
  3066. if (host->socket != ENET_SOCKET_NULL)
  3067. enet_socket_destroy(host->socket);
  3068. enet_free(host->peers);
  3069. enet_free(host);
  3070. return NULL;
  3071. }
  3072. if (bufferSize > ENET_HOST_BUFFER_SIZE_MAX)
  3073. bufferSize = ENET_HOST_BUFFER_SIZE_MAX;
  3074. else if (bufferSize < ENET_HOST_BUFFER_SIZE_MIN)
  3075. bufferSize = ENET_HOST_BUFFER_SIZE_MIN;
  3076. enet_socket_set_option(host->socket, ENET_SOCKOPT_NONBLOCK, 1);
  3077. enet_socket_set_option(host->socket, ENET_SOCKOPT_BROADCAST, 1);
  3078. enet_socket_set_option(host->socket, ENET_SOCKOPT_RCVBUF, bufferSize);
  3079. enet_socket_set_option(host->socket, ENET_SOCKOPT_SNDBUF, bufferSize);
  3080. if (address != NULL && enet_socket_get_address(host->socket, &host->address) < 0)
  3081. host->address = *address;
  3082. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3083. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3084. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3085. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3086. host->randomSeed = (enet_uint32)(size_t)host;
  3087. host->randomSeed += enet_host_random_seed();
  3088. host->randomSeed = (host->randomSeed << 16) | (host->randomSeed >> 16);
  3089. host->channelLimit = channelLimit;
  3090. host->incomingBandwidth = incomingBandwidth;
  3091. host->outgoingBandwidth = outgoingBandwidth;
  3092. host->bandwidthThrottleEpoch = 0;
  3093. host->recalculateBandwidthLimits = 0;
  3094. host->preventConnections = 0;
  3095. host->mtu = ENET_HOST_DEFAULT_MTU;
  3096. host->peerCount = peerCount;
  3097. host->commandCount = 0;
  3098. host->bufferCount = 0;
  3099. host->compression = 0;
  3100. host->compressionBufferSize = 0;
  3101. host->checksumCallback = NULL;
  3102. host->receivedAddress.ipv6 = ENET_HOST_ANY;
  3103. host->receivedAddress.port = 0;
  3104. host->receivedData = NULL;
  3105. host->receivedDataLength = 0;
  3106. host->totalSentData = 0;
  3107. host->totalSentPackets = 0;
  3108. host->totalReceivedData = 0;
  3109. host->totalReceivedPackets = 0;
  3110. host->connectedPeers = 0;
  3111. host->bandwidthLimitedPeers = 0;
  3112. host->duplicatePeers = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  3113. host->maximumPacketSize = ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE;
  3114. host->maximumWaitingData = ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA;
  3115. host->interceptCallback = NULL;
  3116. enet_list_clear(&host->dispatchQueue);
  3117. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3118. currentPeer->host = host;
  3119. currentPeer->incomingPeerID = currentPeer - host->peers;
  3120. currentPeer->outgoingSessionID = currentPeer->incomingSessionID = 0xFF;
  3121. currentPeer->data = NULL;
  3122. enet_list_clear(&currentPeer->acknowledgements);
  3123. enet_list_clear(&currentPeer->sentReliableCommands);
  3124. enet_list_clear(&currentPeer->sentUnreliableCommands);
  3125. enet_list_clear(&currentPeer->outgoingReliableCommands);
  3126. enet_list_clear(&currentPeer->outgoingUnreliableCommands);
  3127. enet_list_clear(&currentPeer->dispatchedCommands);
  3128. enet_peer_reset(currentPeer);
  3129. }
  3130. ENET_LOG_TRACE("host created successfully\n");
  3131. return host;
  3132. }
  3133. void enet_host_destroy(ENetHost* host) {
  3134. ENetPeer* currentPeer;
  3135. if (host == NULL)
  3136. return;
  3137. enet_socket_destroy(host->socket);
  3138. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3139. enet_peer_reset(currentPeer);
  3140. }
  3141. enet_free(host->peers);
  3142. enet_free(host->compressionBuffer);
  3143. enet_free(host);
  3144. }
  3145. void enet_host_enable_compression(ENetHost* host) {
  3146. if (host == NULL)
  3147. return;
  3148. host->compression = 1;
  3149. }
  3150. void enet_host_prevent_connections(ENetHost* host, enet_uint8 state) {
  3151. if (host == NULL)
  3152. return;
  3153. host->preventConnections = state;
  3154. }
  3155. ENetPeer* enet_host_connect(ENetHost* host, const ENetAddress* address, size_t channelCount, enet_uint32 data) {
  3156. ENetPeer* currentPeer;
  3157. ENetChannel* channel;
  3158. ENetProtocol command;
  3159. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3160. channelCount = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3161. else if (channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3162. channelCount = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3163. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3164. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED)
  3165. break;
  3166. }
  3167. if (currentPeer >= &host->peers[host->peerCount])
  3168. return NULL;
  3169. currentPeer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  3170. if (currentPeer->channels == NULL)
  3171. return NULL;
  3172. currentPeer->channelCount = channelCount;
  3173. currentPeer->state = ENET_PEER_STATE_CONNECTING;
  3174. currentPeer->address = *address;
  3175. currentPeer->connectID = ++host->randomSeed;
  3176. if (host->outgoingBandwidth == 0)
  3177. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3178. else
  3179. currentPeer->windowSize = (host->outgoingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3180. if (currentPeer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  3181. currentPeer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3182. else if (currentPeer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  3183. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3184. for (channel = currentPeer->channels; channel < &currentPeer->channels[channelCount]; ++channel) {
  3185. channel->outgoingReliableSequenceNumber = 0;
  3186. channel->outgoingUnreliableSequenceNumber = 0;
  3187. channel->incomingReliableSequenceNumber = 0;
  3188. channel->incomingUnreliableSequenceNumber = 0;
  3189. enet_list_clear(&channel->incomingReliableCommands);
  3190. enet_list_clear(&channel->incomingUnreliableCommands);
  3191. channel->usedReliableWindows = 0;
  3192. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  3193. }
  3194. command.header.command = ENET_PROTOCOL_COMMAND_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3195. command.header.channelID = 0xFF;
  3196. command.connect.outgoingPeerID = ENET_HOST_TO_NET_16(currentPeer->incomingPeerID);
  3197. command.connect.incomingSessionID = currentPeer->incomingSessionID;
  3198. command.connect.outgoingSessionID = currentPeer->outgoingSessionID;
  3199. command.connect.mtu = ENET_HOST_TO_NET_32(currentPeer->mtu);
  3200. command.connect.windowSize = ENET_HOST_TO_NET_32(currentPeer->windowSize);
  3201. command.connect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  3202. command.connect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  3203. command.connect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3204. command.connect.packetThrottleInterval = ENET_HOST_TO_NET_32(currentPeer->packetThrottleInterval);
  3205. command.connect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleAcceleration);
  3206. command.connect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleDeceleration);
  3207. command.connect.connectID = currentPeer->connectID;
  3208. command.connect.data = ENET_HOST_TO_NET_32(data);
  3209. enet_peer_queue_outgoing_command(currentPeer, &command, NULL, 0, 0);
  3210. return currentPeer;
  3211. }
  3212. void enet_host_broadcast(ENetHost* host, enet_uint8 channelID, ENetPacket* packet) {
  3213. ENetPeer* currentPeer;
  3214. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3215. ++packet->referenceCount;
  3216. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3217. if (currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3218. continue;
  3219. enet_peer_send(currentPeer, channelID, packet);
  3220. }
  3221. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3222. --packet->referenceCount;
  3223. if (packet->referenceCount == 0)
  3224. enet_packet_destroy(packet);
  3225. }
  3226. void enet_host_broadcast_exclude(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer* excludedPeer) {
  3227. ENetPeer* currentPeer;
  3228. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3229. ++packet->referenceCount;
  3230. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3231. if (currentPeer->state != ENET_PEER_STATE_CONNECTED || currentPeer == excludedPeer)
  3232. continue;
  3233. enet_peer_send(currentPeer, channelID, packet);
  3234. }
  3235. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3236. --packet->referenceCount;
  3237. if (packet->referenceCount == 0)
  3238. enet_packet_destroy(packet);
  3239. }
  3240. void enet_host_broadcast_selective(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer** peers, size_t length) {
  3241. ENetPeer* currentPeer;
  3242. size_t i;
  3243. if (host == NULL)
  3244. return;
  3245. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3246. ++packet->referenceCount;
  3247. for (i = 0; i < length; i++) {
  3248. currentPeer = peers[i];
  3249. if (currentPeer == NULL || currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3250. continue;
  3251. enet_peer_send(currentPeer, channelID, packet);
  3252. }
  3253. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3254. --packet->referenceCount;
  3255. if (packet->referenceCount == 0)
  3256. enet_packet_destroy(packet);
  3257. }
  3258. void enet_host_channel_limit(ENetHost* host, size_t channelLimit) {
  3259. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3260. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3261. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3262. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3263. host->channelLimit = channelLimit;
  3264. }
  3265. void enet_host_bandwidth_limit(ENetHost* host, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth) {
  3266. host->incomingBandwidth = incomingBandwidth;
  3267. host->outgoingBandwidth = outgoingBandwidth;
  3268. host->recalculateBandwidthLimits = 1;
  3269. }
  3270. void enet_host_bandwidth_throttle(ENetHost* host) {
  3271. enet_uint32 timeCurrent = enet_time_get();
  3272. enet_uint32 elapsedTime = timeCurrent - host->bandwidthThrottleEpoch;
  3273. enet_uint32 peersRemaining = (enet_uint32)host->connectedPeers;
  3274. enet_uint32 dataTotal = ~0;
  3275. enet_uint32 bandwidth = ~0;
  3276. enet_uint32 throttle = 0;
  3277. enet_uint32 bandwidthLimit = 0;
  3278. int needsAdjustment = host->bandwidthLimitedPeers > 0 ? 1 : 0;
  3279. ENetPeer* peer;
  3280. ENetProtocol command;
  3281. if (elapsedTime < ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  3282. return;
  3283. if (host->outgoingBandwidth == 0 && host->incomingBandwidth == 0)
  3284. return;
  3285. host->bandwidthThrottleEpoch = timeCurrent;
  3286. if (peersRemaining == 0)
  3287. return;
  3288. if (host->outgoingBandwidth != 0) {
  3289. dataTotal = 0;
  3290. bandwidth = (host->outgoingBandwidth * elapsedTime) / 1000;
  3291. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3292. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3293. continue;
  3294. dataTotal += peer->outgoingDataTotal;
  3295. }
  3296. }
  3297. while (peersRemaining > 0 && needsAdjustment != 0) {
  3298. needsAdjustment = 0;
  3299. if (dataTotal <= bandwidth)
  3300. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3301. else
  3302. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3303. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3304. enet_uint32 peerBandwidth;
  3305. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidth == 0 || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3306. continue;
  3307. peerBandwidth = (peer->incomingBandwidth * elapsedTime) / 1000;
  3308. if ((throttle * peer->outgoingDataTotal) / ENET_PEER_PACKET_THROTTLE_SCALE <= peerBandwidth)
  3309. continue;
  3310. peer->packetThrottleLimit = (peerBandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / peer->outgoingDataTotal;
  3311. if (peer->packetThrottleLimit == 0)
  3312. peer->packetThrottleLimit = 1;
  3313. if (peer->packetThrottle > peer->packetThrottleLimit)
  3314. peer->packetThrottle = peer->packetThrottleLimit;
  3315. peer->outgoingBandwidthThrottleEpoch = timeCurrent;
  3316. peer->incomingDataTotal = 0;
  3317. peer->outgoingDataTotal = 0;
  3318. needsAdjustment = 1;
  3319. --peersRemaining;
  3320. bandwidth -= peerBandwidth;
  3321. dataTotal -= peerBandwidth;
  3322. }
  3323. }
  3324. if (peersRemaining > 0) {
  3325. if (dataTotal <= bandwidth)
  3326. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3327. else
  3328. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3329. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3330. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3331. continue;
  3332. peer->packetThrottleLimit = throttle;
  3333. if (peer->packetThrottle > peer->packetThrottleLimit)
  3334. peer->packetThrottle = peer->packetThrottleLimit;
  3335. peer->incomingDataTotal = 0;
  3336. peer->outgoingDataTotal = 0;
  3337. }
  3338. }
  3339. if (host->recalculateBandwidthLimits) {
  3340. host->recalculateBandwidthLimits = 0;
  3341. peersRemaining = (enet_uint32)host->connectedPeers;
  3342. bandwidth = host->incomingBandwidth;
  3343. needsAdjustment = 1;
  3344. if (bandwidth == 0) {
  3345. bandwidthLimit = 0;
  3346. } else {
  3347. while (peersRemaining > 0 && needsAdjustment != 0) {
  3348. needsAdjustment = 0;
  3349. bandwidthLimit = bandwidth / peersRemaining;
  3350. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3351. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3352. continue;
  3353. if (peer->outgoingBandwidth > 0 && peer->outgoingBandwidth >= bandwidthLimit)
  3354. continue;
  3355. peer->incomingBandwidthThrottleEpoch = timeCurrent;
  3356. needsAdjustment = 1;
  3357. --peersRemaining;
  3358. bandwidth -= peer->outgoingBandwidth;
  3359. }
  3360. }
  3361. }
  3362. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3363. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3364. continue;
  3365. command.header.command = ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3366. command.header.channelID = 0xFF;
  3367. command.bandwidthLimit.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3368. if (peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3369. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(peer->outgoingBandwidth);
  3370. else
  3371. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(bandwidthLimit);
  3372. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  3373. }
  3374. }
  3375. }
  3376. /*
  3377. =======================================================================
  3378. Address
  3379. =======================================================================
  3380. */
  3381. int enet_address_set_host_ip(ENetAddress* address, const char* ip) {
  3382. int type = AF_INET6;
  3383. void* destination = &address->ipv6;
  3384. if (strchr(ip, ':') == NULL) {
  3385. type = AF_INET;
  3386. address->ipv4.ffff = 0xFFFF;
  3387. destination = &address->ipv4.ip;
  3388. }
  3389. if (!inet_pton(type, ip, destination)) {
  3390. ENET_LOG_ERROR("inet_pton failure");
  3391. return -1;
  3392. }
  3393. return 0;
  3394. }
  3395. int enet_address_set_host(ENetAddress* address, const char* name) {
  3396. struct addrinfo hints, *resultList = NULL, *result = NULL;
  3397. memset(&hints, 0, sizeof(hints));
  3398. hints.ai_family = AF_UNSPEC;
  3399. if (getaddrinfo(name, NULL, &hints, &resultList) != 0) {
  3400. ENET_LOG_ERROR("Could not getaddrinfo");
  3401. return -1;
  3402. }
  3403. for (result = resultList; result != NULL; result = result->ai_next) {
  3404. if (result->ai_addr != NULL && result->ai_addrlen >= sizeof(struct sockaddr_in)) {
  3405. if (result->ai_family == AF_INET) {
  3406. struct sockaddr_in* sin = (struct sockaddr_in*)result->ai_addr;
  3407. memset(address, 0, sizeof(address->ipv4.zeros));
  3408. address->ipv4.ffff = 0xFFFF;
  3409. address->ipv4.ip.s_addr = sin->sin_addr.s_addr;
  3410. freeaddrinfo(resultList);
  3411. return 0;
  3412. } else if (result->ai_family == AF_INET6) {
  3413. struct sockaddr_in6* sin = (struct sockaddr_in6*)result->ai_addr;
  3414. address->ipv6 = sin->sin6_addr;
  3415. freeaddrinfo(resultList);
  3416. return 0;
  3417. }
  3418. }
  3419. }
  3420. if (resultList != NULL)
  3421. freeaddrinfo(resultList);
  3422. return enet_address_set_host_ip(address, name);
  3423. }
  3424. int enet_address_get_host_ip(const ENetAddress* address, char* ip, size_t ipLength) {
  3425. if (inet_ntop(AF_INET6, &address->ipv6, ip, ipLength) == NULL) {
  3426. ENET_LOG_ERROR("inet_ntop failure (was NULL)");
  3427. return -1;
  3428. }
  3429. if (enet_array_is_zeroed(address->ipv4.zeros, sizeof(address->ipv4.zeros)) == 0 && address->ipv4.ffff == 0xFFFF)
  3430. enet_string_copy(ip, ip + 7, ipLength);
  3431. return 0;
  3432. }
  3433. int enet_address_get_host(const ENetAddress* address, char* name, size_t nameLength) {
  3434. struct sockaddr_in6 sin;
  3435. int err;
  3436. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3437. sin.sin6_family = AF_INET6;
  3438. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3439. sin.sin6_addr = address->ipv6;
  3440. err = getnameinfo((struct sockaddr*)&sin, sizeof(sin), name, nameLength, NULL, 0, NI_NAMEREQD);
  3441. if (!err) {
  3442. if (name != NULL && nameLength > 0 && !memchr(name, '\0', nameLength)) {
  3443. ENET_LOG_ERROR("something funky going on here");
  3444. return -1;
  3445. }
  3446. return 0;
  3447. }
  3448. if (err != EAI_NONAME) {
  3449. ENET_LOG_ERROR("some error occurred: %i", err);
  3450. return -1;
  3451. }
  3452. return enet_address_get_host_ip(address, name, nameLength);
  3453. }
  3454. /*
  3455. =======================================================================
  3456. Platform-specific (Unix)
  3457. =======================================================================
  3458. */
  3459. #ifndef _WIN32
  3460. int enet_initialize(void) {
  3461. return 0;
  3462. }
  3463. void enet_deinitialize(void) { }
  3464. enet_uint64 enet_host_random_seed(void) {
  3465. struct timeval timeVal;
  3466. gettimeofday(&timeVal, NULL);
  3467. return (timeVal.tv_sec * 1000) ^ (timeVal.tv_usec / 1000);
  3468. }
  3469. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3470. struct sockaddr_in6 sin;
  3471. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3472. sin.sin6_family = AF_INET6;
  3473. if (address != NULL) {
  3474. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3475. sin.sin6_addr = address->ipv6;
  3476. } else {
  3477. sin.sin6_port = 0;
  3478. sin.sin6_addr = ENET_HOST_ANY;
  3479. }
  3480. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3481. }
  3482. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3483. struct sockaddr_in6 sin;
  3484. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3485. if (getsockname(socket, (struct sockaddr*) & sin, &sinLength) == -1) {
  3486. ENET_LOG_ERROR("getsockname failure");
  3487. return -1;
  3488. }
  3489. address->ipv6 = sin.sin6_addr;
  3490. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3491. return 0;
  3492. }
  3493. int enet_socket_listen(ENetSocket socket, int backlog) {
  3494. return listen(socket, backlog < 0 ? SOMAXCONN : backlog);
  3495. }
  3496. ENetSocket enet_socket_create(ENetSocketType type) {
  3497. int socketType = (type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM);
  3498. #ifdef SOCK_CLOEXEC
  3499. socketType |= SOCK_CLOEXEC;
  3500. #endif
  3501. return socket(PF_INET6, socketType, 0);
  3502. }
  3503. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3504. int result = -1;
  3505. switch (option) {
  3506. case ENET_SOCKOPT_NONBLOCK:
  3507. result = fcntl(socket, F_SETFL, (value ? O_NONBLOCK : 0) | (fcntl(socket, F_GETFL) & ~O_NONBLOCK));
  3508. break;
  3509. case ENET_SOCKOPT_BROADCAST:
  3510. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3511. break;
  3512. case ENET_SOCKOPT_REUSEADDR:
  3513. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3514. break;
  3515. case ENET_SOCKOPT_RCVBUF:
  3516. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3517. break;
  3518. case ENET_SOCKOPT_SNDBUF:
  3519. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3520. break;
  3521. case ENET_SOCKOPT_RCVTIMEO: {
  3522. struct timeval timeVal;
  3523. timeVal.tv_sec = value / 1000;
  3524. timeVal.tv_usec = (value % 1000) * 1000;
  3525. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3526. break;
  3527. }
  3528. case ENET_SOCKOPT_SNDTIMEO: {
  3529. struct timeval timeVal;
  3530. timeVal.tv_sec = value / 1000;
  3531. timeVal.tv_usec = (value % 1000) * 1000;
  3532. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeVal, sizeof(struct timeval));
  3533. break;
  3534. }
  3535. case ENET_SOCKOPT_NODELAY:
  3536. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3537. break;
  3538. case ENET_SOCKOPT_IPV6_V6ONLY:
  3539. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3540. break;
  3541. default:
  3542. break;
  3543. }
  3544. return result == -1 ? -1 : 0;
  3545. }
  3546. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3547. int result = -1;
  3548. socklen_t len;
  3549. switch (option) {
  3550. case ENET_SOCKOPT_ERROR:
  3551. len = sizeof(int);
  3552. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, value, &len);
  3553. break;
  3554. default:
  3555. break;
  3556. }
  3557. return result == -1 ? -1 : 0;
  3558. }
  3559. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3560. int result = -1;
  3561. struct sockaddr_in6 sin;
  3562. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3563. sin.sin6_family = AF_INET6;
  3564. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3565. sin.sin6_addr = address->ipv6;
  3566. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3567. if (result == -1 && errno == EINPROGRESS)
  3568. return 0;
  3569. return result;
  3570. }
  3571. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3572. int result = -1;
  3573. struct sockaddr_in6 sin;
  3574. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3575. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3576. if (result == -1)
  3577. return ENET_SOCKET_NULL;
  3578. if (address != NULL) {
  3579. address->ipv6 = sin.sin6_addr;
  3580. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3581. }
  3582. return result;
  3583. }
  3584. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3585. return shutdown(socket, (int)how);
  3586. }
  3587. void enet_socket_destroy(ENetSocket socket) {
  3588. if (socket != ENET_SOCKET_NULL)
  3589. close(socket);
  3590. }
  3591. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3592. struct msghdr msgHdr;
  3593. struct sockaddr_in6 sin;
  3594. int sentLength;
  3595. memset(&msgHdr, 0, sizeof(struct msghdr));
  3596. if (address != NULL) {
  3597. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3598. sin.sin6_family = AF_INET6;
  3599. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3600. sin.sin6_addr = address->ipv6;
  3601. msgHdr.msg_name = &sin;
  3602. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3603. }
  3604. msgHdr.msg_iov = (struct iovec*)buffers;
  3605. msgHdr.msg_iovlen = bufferCount;
  3606. sentLength = sendmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3607. if (sentLength == -1) {
  3608. if (errno == EWOULDBLOCK)
  3609. return 0;
  3610. ENET_LOG_ERROR("sentLength weirdness");
  3611. return -1;
  3612. }
  3613. return sentLength;
  3614. }
  3615. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3616. struct msghdr msgHdr;
  3617. struct sockaddr_in6 sin;
  3618. int recvLength;
  3619. memset(&msgHdr, 0, sizeof(struct msghdr));
  3620. if (address != NULL) {
  3621. msgHdr.msg_name = &sin;
  3622. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3623. }
  3624. msgHdr.msg_iov = (struct iovec*)buffers;
  3625. msgHdr.msg_iovlen = bufferCount;
  3626. recvLength = recvmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3627. if (recvLength == -1) {
  3628. if (errno == EWOULDBLOCK)
  3629. return 0;
  3630. ENET_LOG_ERROR("recvLength weirdness");
  3631. return -1;
  3632. }
  3633. if (msgHdr.msg_flags & MSG_TRUNC) {
  3634. ENET_LOG_ERROR("message was truncated...");
  3635. return -1;
  3636. }
  3637. if (address != NULL) {
  3638. address->ipv6 = sin.sin6_addr;
  3639. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3640. }
  3641. return recvLength;
  3642. }
  3643. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3644. struct timeval timeVal;
  3645. timeVal.tv_sec = timeout / 1000;
  3646. timeVal.tv_usec = (timeout % 1000) * 1000;
  3647. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3648. }
  3649. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3650. struct pollfd pollSocket;
  3651. int pollCount;
  3652. pollSocket.fd = socket;
  3653. pollSocket.events = 0;
  3654. if (*condition & ENET_SOCKET_WAIT_SEND)
  3655. pollSocket.events |= POLLOUT;
  3656. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3657. pollSocket.events |= POLLIN;
  3658. pollCount = poll(&pollSocket, 1, timeout);
  3659. if (pollCount < 0) {
  3660. if (errno == EINTR && *condition & ENET_SOCKET_WAIT_INTERRUPT) {
  3661. *condition = ENET_SOCKET_WAIT_INTERRUPT;
  3662. return 0;
  3663. }
  3664. ENET_LOG_DEBUG("pollCount < 0: %i", pollCount);
  3665. return -1;
  3666. }
  3667. *condition = ENET_SOCKET_WAIT_NONE;
  3668. if (pollCount == 0)
  3669. return 0;
  3670. if (pollSocket.revents & POLLOUT)
  3671. *condition |= ENET_SOCKET_WAIT_SEND;
  3672. if (pollSocket.revents & POLLIN)
  3673. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3674. return 0;
  3675. }
  3676. #endif
  3677. /*
  3678. =======================================================================
  3679. Platform-specific (Windows)
  3680. =======================================================================
  3681. */
  3682. #ifdef _WIN32
  3683. int enet_initialize(void) {
  3684. WORD versionRequested = MAKEWORD(2, 2);
  3685. WSADATA wsaData;
  3686. if (WSAStartup(versionRequested, &wsaData)) {
  3687. ENET_LOG_ERROR("WSAStartup failure");
  3688. return -1;
  3689. }
  3690. if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
  3691. ENET_LOG_ERROR("Winsock version mismatch");
  3692. WSACleanup();
  3693. return -1;
  3694. }
  3695. timeBeginPeriod(1);
  3696. ENET_LOG_TRACE("Initialization");
  3697. return 0;
  3698. }
  3699. void enet_deinitialize(void) {
  3700. timeEndPeriod(1);
  3701. WSACleanup();
  3702. ENET_LOG_TRACE("Deinitialization");
  3703. }
  3704. enet_uint64 enet_host_random_seed(void) {
  3705. return (enet_uint64)timeGetTime();
  3706. }
  3707. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3708. struct sockaddr_in6 sin;
  3709. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3710. sin.sin6_family = AF_INET6;
  3711. if (address != NULL) {
  3712. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3713. sin.sin6_addr = address->ipv6;
  3714. } else {
  3715. sin.sin6_port = 0;
  3716. sin.sin6_addr = in6addr_any;
  3717. }
  3718. return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)) == SOCKET_ERROR ? -1 : 0;
  3719. }
  3720. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3721. struct sockaddr_in6 sin;
  3722. int sinLength = sizeof(struct sockaddr_in6);
  3723. if (getsockname(socket, (struct sockaddr*) & sin, &sinLength) == -1) {
  3724. ENET_LOG_ERROR("getsockname failure");
  3725. return -1;
  3726. }
  3727. address->ipv6 = sin.sin6_addr;
  3728. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3729. return 0;
  3730. }
  3731. int enet_socket_listen(ENetSocket socket, int backlog) {
  3732. return listen(socket, backlog < 0 ? SOMAXCONN : backlog) == SOCKET_ERROR ? -1 : 0;
  3733. }
  3734. ENetSocket enet_socket_create(ENetSocketType type) {
  3735. return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
  3736. }
  3737. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3738. int result = SOCKET_ERROR;
  3739. switch (option) {
  3740. case ENET_SOCKOPT_NONBLOCK: {
  3741. u_long nonBlocking = (u_long)value;
  3742. result = ioctlsocket(socket, FIONBIO, &nonBlocking);
  3743. break;
  3744. }
  3745. case ENET_SOCKOPT_BROADCAST:
  3746. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int));
  3747. break;
  3748. case ENET_SOCKOPT_REUSEADDR:
  3749. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
  3750. break;
  3751. case ENET_SOCKOPT_RCVBUF:
  3752. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int));
  3753. break;
  3754. case ENET_SOCKOPT_SNDBUF:
  3755. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int));
  3756. break;
  3757. case ENET_SOCKOPT_RCVTIMEO:
  3758. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&value, sizeof(int));
  3759. break;
  3760. case ENET_SOCKOPT_SNDTIMEO:
  3761. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&value, sizeof(int));
  3762. break;
  3763. case ENET_SOCKOPT_NODELAY:
  3764. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int));
  3765. break;
  3766. case ENET_SOCKOPT_IPV6_V6ONLY:
  3767. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int));
  3768. break;
  3769. default:
  3770. break;
  3771. }
  3772. return result == SOCKET_ERROR ? -1 : 0;
  3773. }
  3774. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3775. int result = SOCKET_ERROR, len;
  3776. switch (option) {
  3777. case ENET_SOCKOPT_ERROR:
  3778. len = sizeof(int);
  3779. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, (char*)value, &len);
  3780. break;
  3781. default:
  3782. break;
  3783. }
  3784. return result == SOCKET_ERROR ? -1 : 0;
  3785. }
  3786. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3787. int result = -1;
  3788. struct sockaddr_in6 sin;
  3789. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3790. sin.sin6_family = AF_INET6;
  3791. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3792. sin.sin6_addr = address->ipv6;
  3793. result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6));
  3794. if (result == SOCKET_ERROR && WSAGetLastError() != WSAEWOULDBLOCK) {
  3795. int winSockWhat = WSAGetLastError();
  3796. ENET_LOG_ERROR("Socket connect failure, return code: %i, WSAGetLastError: %i", result, winSockWhat);
  3797. return -1;
  3798. }
  3799. return 0;
  3800. }
  3801. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3802. SOCKET result;
  3803. struct sockaddr_in6 sin;
  3804. int sinLength = sizeof(struct sockaddr_in6);
  3805. result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL);
  3806. if (result == INVALID_SOCKET) {
  3807. ENET_LOG_ERROR("Tried to accept from an invalid socket");
  3808. return ENET_SOCKET_NULL;
  3809. }
  3810. if (address != NULL) {
  3811. address->ipv6 = sin.sin6_addr;
  3812. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3813. }
  3814. return result;
  3815. }
  3816. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3817. return shutdown(socket, (int)how) == SOCKET_ERROR ? -1 : 0;
  3818. }
  3819. void enet_socket_destroy(ENetSocket socket) {
  3820. if (socket != INVALID_SOCKET)
  3821. closesocket(socket);
  3822. }
  3823. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3824. struct sockaddr_in6 sin;
  3825. DWORD sentLength;
  3826. if (address != NULL) {
  3827. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3828. sin.sin6_family = AF_INET6;
  3829. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3830. sin.sin6_addr = address->ipv6;
  3831. }
  3832. 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)
  3833. return (WSAGetLastError() == WSAEWOULDBLOCK) ? 0 : -1;
  3834. return (int)sentLength;
  3835. }
  3836. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3837. INT sinLength = sizeof(struct sockaddr_in6);
  3838. DWORD flags = 0, recvLength;
  3839. struct sockaddr_in6 sin;
  3840. if (WSARecvFrom(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &recvLength, &flags, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL, NULL, NULL) == SOCKET_ERROR) {
  3841. int retCode = WSAGetLastError();
  3842. switch (retCode) {
  3843. case WSAEWOULDBLOCK:
  3844. case WSAECONNRESET:
  3845. return 0;
  3846. }
  3847. ENET_LOG_ERROR("Socket receive failure, WSA return code %d", retCode);
  3848. return -1;
  3849. }
  3850. if (flags & MSG_PARTIAL) {
  3851. ENET_LOG_ERROR("Socket receive message was partial??");
  3852. return -1;
  3853. }
  3854. if (address != NULL) {
  3855. address->ipv6 = sin.sin6_addr;
  3856. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3857. }
  3858. return (int)recvLength;
  3859. }
  3860. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3861. struct timeval timeVal;
  3862. timeVal.tv_sec = timeout / 1000;
  3863. timeVal.tv_usec = (timeout % 1000) * 1000;
  3864. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3865. }
  3866. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3867. fd_set readSet, writeSet;
  3868. struct timeval timeVal;
  3869. int selectCount;
  3870. timeVal.tv_sec = timeout / 1000;
  3871. timeVal.tv_usec = (timeout % 1000) * 1000;
  3872. FD_ZERO(&readSet);
  3873. FD_ZERO(&writeSet);
  3874. if (*condition & ENET_SOCKET_WAIT_SEND)
  3875. FD_SET(socket, &writeSet);
  3876. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3877. FD_SET(socket, &readSet);
  3878. selectCount = select(socket + 1, &readSet, &writeSet, NULL, &timeVal);
  3879. if (selectCount < 0) {
  3880. ENET_LOG_ERROR("selectCount < 0; was %d", selectCount);
  3881. return -1;
  3882. }
  3883. *condition = ENET_SOCKET_WAIT_NONE;
  3884. if (selectCount == 0)
  3885. return 0;
  3886. if (FD_ISSET(socket, &writeSet))
  3887. *condition |= ENET_SOCKET_WAIT_SEND;
  3888. if (FD_ISSET(socket, &readSet))
  3889. *condition |= ENET_SOCKET_WAIT_RECEIVE;
  3890. return 0;
  3891. }
  3892. #endif
  3893. /*
  3894. =======================================================================
  3895. Extended functionality
  3896. =======================================================================
  3897. */
  3898. void* enet_packet_get_data(const ENetPacket* packet) {
  3899. return (void*)packet->data;
  3900. }
  3901. int enet_packet_get_length(const ENetPacket* packet) {
  3902. return packet->dataLength;
  3903. }
  3904. void enet_packet_set_free_callback(ENetPacket* packet, const void* callback) {
  3905. packet->freeCallback = (ENetPacketFreeCallback)callback;
  3906. }
  3907. int enet_packet_check_references(const ENetPacket* packet) {
  3908. return (int)packet->referenceCount;
  3909. }
  3910. void enet_packet_dispose(ENetPacket* packet) {
  3911. if (packet->referenceCount == 0)
  3912. enet_packet_destroy(packet);
  3913. }
  3914. enet_uint32 enet_host_get_peers_count(const ENetHost* host) {
  3915. return host->connectedPeers;
  3916. }
  3917. enet_uint32 enet_host_get_packets_sent(const ENetHost* host) {
  3918. return host->totalSentPackets;
  3919. }
  3920. enet_uint32 enet_host_get_packets_received(const ENetHost* host) {
  3921. return host->totalReceivedPackets;
  3922. }
  3923. enet_uint32 enet_host_get_bytes_sent(const ENetHost* host) {
  3924. return host->totalSentData;
  3925. }
  3926. enet_uint32 enet_host_get_bytes_received(const ENetHost* host) {
  3927. return host->totalReceivedData;
  3928. }
  3929. enet_uint32 enet_peer_get_id(const ENetPeer* peer) {
  3930. return peer->incomingPeerID;
  3931. }
  3932. int enet_peer_get_ip(const ENetPeer* peer, char* ip, size_t ipLength) {
  3933. return enet_address_get_host_ip(&peer->address, ip, ipLength);
  3934. }
  3935. enet_uint16 enet_peer_get_port(const ENetPeer* peer) {
  3936. return peer->address.port;
  3937. }
  3938. enet_uint32 enet_peer_get_mtu(const ENetPeer* peer) {
  3939. return peer->mtu;
  3940. }
  3941. ENetPeerState enet_peer_get_state(const ENetPeer* peer) {
  3942. return peer->state;
  3943. }
  3944. enet_uint32 enet_peer_get_rtt(const ENetPeer* peer) {
  3945. return peer->smoothedRoundTripTime;
  3946. }
  3947. enet_uint32 enet_peer_get_lastsendtime(const ENetPeer* peer) {
  3948. return peer->lastSendTime;
  3949. }
  3950. enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer* peer) {
  3951. return peer->lastReceiveTime;
  3952. }
  3953. enet_uint64 enet_peer_get_packets_sent(const ENetPeer* peer) {
  3954. return peer->totalPacketsSent;
  3955. }
  3956. enet_uint64 enet_peer_get_packets_lost(const ENetPeer* peer) {
  3957. return peer->totalPacketsLost;
  3958. }
  3959. enet_uint64 enet_peer_get_bytes_sent(const ENetPeer* peer) {
  3960. return peer->totalDataSent;
  3961. }
  3962. enet_uint64 enet_peer_get_bytes_received(const ENetPeer* peer) {
  3963. return peer->totalDataReceived;
  3964. }
  3965. void* enet_peer_get_data(const ENetPeer* peer) {
  3966. return (void*)peer->data;
  3967. }
  3968. void enet_peer_set_data(ENetPeer* peer, const void* data) {
  3969. peer->data = (enet_uint32*)data;
  3970. }
  3971. #ifdef __cplusplus
  3972. }
  3973. #endif
  3974. #endif
  3975. #endif