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