enet.h 178 KB

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  1. /*
  2. * ENet reliable UDP networking library
  3. * Improvements (c) SoftwareGuy (Coburn), c6burns
  4. * Original copyright (c) 2018 Lee Salzman, Vladyslav Hrytsenko, Dominik Madarász, Stanislav Denisov
  5. *
  6. * Permission is hereby granted, free of charge, to any person obtaining a copy
  7. * of this software and associated documentation files (the "Software"), to deal
  8. * in the Software without restriction, including without limitation the rights
  9. * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10. * copies of the Software, and to permit persons to whom the Software is
  11. * furnished to do so, subject to the following conditions:
  12. *
  13. * The above copyright notice and this permission notice shall be included in all
  14. * copies or substantial portions of the Software.
  15. *
  16. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19. * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22. * SOFTWARE.
  23. */
  24. #ifndef ENET_H
  25. #define ENET_H
  26. #include <stdbool.h>
  27. #include <stdint.h>
  28. #include <stdlib.h>
  29. #include <time.h>
  30. #include "enet_log.h"
  31. #define ENET_VERSION_MAJOR 2
  32. #define ENET_VERSION_MINOR 3
  33. #define ENET_VERSION_PATCH 0
  34. #define ENET_VERSION_CREATE(major, minor, patch) (((major) << 16) | ((minor) << 8) | (patch))
  35. #define ENET_VERSION_GET_MAJOR(version) (((version) >> 16) & 0xFF)
  36. #define ENET_VERSION_GET_MINOR(version) (((version) >> 8) & 0xFF)
  37. #define ENET_VERSION_GET_PATCH(version) ((version) & 0xFF)
  38. #define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH)
  39. #define ENET_TIME_OVERFLOW 86400000
  40. #define ENET_TIME_LESS(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW)
  41. #define ENET_TIME_GREATER(a, b) ((b) - (a) >= ENET_TIME_OVERFLOW)
  42. #define ENET_TIME_LESS_EQUAL(a, b) (!ENET_TIME_GREATER(a, b))
  43. #define ENET_TIME_GREATER_EQUAL(a, b) (!ENET_TIME_LESS(a, b))
  44. #define ENET_TIME_DIFFERENCE(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW ? (b) - (a) : (a) - (b))
  45. #define ENET_MAX(x, y) ((x) > (y) ? (x) : (y))
  46. #define ENET_MIN(x, y) ((x) < (y) ? (x) : (y))
  47. #define ENET_SRTT_INITIAL 1.0
  48. #define ENET_SRTT_PARA_G 0.125
  49. /*
  50. =======================================================================
  51. ENET Error Codes
  52. =======================================================================
  53. */
  54. // General
  55. #define ENET_LIBRARY_TOO_OLD -1
  56. #define ENET_LIBRARY_MEMALLOC_NULL -2
  57. // Address and Socket Lookup failures
  58. #define ENET_INET_PTON_FAILURE -5
  59. #define ENET_GETADDRINFO_FAILURE -6
  60. #define ENET_GETSOCKINFO_FAILURE -7
  61. // Host errors
  62. #define ENET_HOST_CHANNEL_GREATER_OR_WEIRD_PEER_STATE -10
  63. #define ENET_HOST_INTERCEPT_FAILURE -11
  64. #define ENET_HOST_FUNKYSTUFF -12
  65. #define ENET_HOST_RANDOMERROR -13
  66. // Dispatching errors
  67. #define ENET_DISPATCH_INCOMING_FAILURE -20
  68. #define ENET_DISPATCH_OUTGOING_FAILURE -21
  69. // Servicing errors
  70. #define ENET_SERVICE_SEND_OUTGOING_FAILURE -22
  71. #define ENET_SERVICE_RECEIVE_INCOMING_FAILURE -23
  72. // Protocol errors
  73. #define ENET_PROTOCOL_CMD_FAIL -25
  74. #define ENET_PROTOCOL_SEND_FAIL -26
  75. // Packet errors
  76. #define ENET_PACKET_DATA_FRAGMENT_WEIRDNESS -30
  77. #define ENET_PACKET_DATA_LENGTH_WEIRDNESS -31
  78. #define ENET_PACKET_DATA_LENGTH_NEGATIVE -32
  79. #define ENET_PACKET_STARTCMD_NULL -33
  80. #define ENET_PACKET_IS_BAD -34
  81. // Peer errors
  82. #define ENET_PEER_NOT_CONNECTED_CORRECTLY -40
  83. #define ENET_PEER_BAD_COMMAND_NUMBER -41
  84. #define ENET_PEER_BECAME_ZOMBIE -42
  85. #define ENET_PEER_SENDFAIL_GENERIC -43
  86. #define ENET_PEER_SENDFAIL_FRAGMENTOVERLOAD -44
  87. #define ENET_PEER_SENDFAIL_FRAGMENTNULL -45
  88. // Socket errors
  89. #define ENET_SOCKET_MSGTRUNCATED -50
  90. #define ENET_SOCKET_WINSOCKMISMATCH -51
  91. #define ENET_SOCKET_WSAFAILED -52
  92. // #define ENET_SOCKET_INVALID -53 <-- conflicts with existing defintion, don't uncomment this
  93. #define ENET_SOCKET_MSGPARTIAL -54
  94. #define ENET_SOCKET_WAITPOLL_NEGATIVE -55
  95. #define ENET_SOCKET_SEND_WEIRDNESS -56
  96. #define ENET_SOCKET_RECEIVE_WEIRDNESS -57
  97. #define ENET_SOCKET_GETSOCKNAME_FAILURE -58
  98. // Queue errors
  99. #define ENET_PEER_QUEUE_INCOMING_FAILURE -60
  100. #define ENET_PEER_QUEUE_OUTGOING_FAILURE -61
  101. #define ENET_PEER_QUEUE_OUTGOING_NULL -62
  102. // "WTF happened here?" for when you don't know what ENET is doing
  103. #define ENET_GENERAL_WHAT_THE_F -255
  104. /*
  105. =======================================================================
  106. System differences
  107. =======================================================================
  108. */
  109. #ifdef _WIN32
  110. #if defined(_MSC_VER) && defined(ENET_IMPLEMENTATION)
  111. #pragma warning(disable: 4244) /* 64-bit to 32-bit integer conversion */
  112. #pragma warning(disable: 4267) /* size_t to integer conversion */
  113. #endif
  114. #ifndef ENET_NO_PRAGMA_LINK
  115. #pragma comment(lib, "ws2_32.lib")
  116. #pragma comment(lib, "winmm.lib")
  117. #endif
  118. #if _MSC_VER >= 1910
  119. /* It looks like there were changes as of Visual Studio 2017 and there are no 32/64 bit
  120. versions of _InterlockedExchange[operation], only InterlockedExchange[operation]
  121. (without leading underscore), so we have to distinguish between compiler versions */
  122. #define NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  123. #endif
  124. #ifdef __GNUC__
  125. #if (_WIN32_WINNT < 0x0501)
  126. #undef _WIN32_WINNT
  127. #define _WIN32_WINNT 0x0501
  128. #endif
  129. #endif
  130. #include <winsock2.h>
  131. #include <ws2tcpip.h>
  132. #include <mmsystem.h>
  133. #include <intrin.h>
  134. #if defined(_WIN32) && defined(_MSC_VER)
  135. #if _MSC_VER < 1900
  136. typedef struct timespec {
  137. long tv_sec;
  138. long tv_nsec;
  139. };
  140. #endif
  141. #define CLOCK_MONOTONIC 0
  142. #endif
  143. typedef SOCKET ENetSocket;
  144. #define ENET_SOCKET_NULL INVALID_SOCKET
  145. typedef struct {
  146. size_t dataLength;
  147. void* data;
  148. } ENetBuffer;
  149. #define ENET_CALLBACK __cdecl
  150. #ifdef ENET_DLL
  151. #ifdef ENET_IMPLEMENTATION
  152. #define ENET_API __declspec(dllexport)
  153. #else
  154. #define ENET_API __declspec(dllimport)
  155. #endif
  156. #else
  157. #define ENET_API extern
  158. #endif
  159. #else
  160. #include <sys/types.h>
  161. #include <sys/ioctl.h>
  162. #include <sys/time.h>
  163. #include <sys/socket.h>
  164. #include <poll.h>
  165. #include <arpa/inet.h>
  166. #include <netinet/in.h>
  167. #include <netinet/tcp.h>
  168. #include <netdb.h>
  169. #include <unistd.h>
  170. #include <string.h>
  171. #include <errno.h>
  172. #include <fcntl.h>
  173. #ifdef __APPLE__
  174. #include <mach/clock.h>
  175. #include <mach/mach.h>
  176. #include <Availability.h>
  177. #endif
  178. #ifndef MSG_NOSIGNAL
  179. #define MSG_NOSIGNAL 0
  180. #endif
  181. #ifdef MSG_MAXIOVLEN
  182. #define ENET_BUFFER_MAXIMUM MSG_MAXIOVLEN
  183. #endif
  184. typedef int ENetSocket;
  185. #define ENET_SOCKET_NULL -1
  186. typedef struct {
  187. void* data;
  188. size_t dataLength;
  189. } ENetBuffer;
  190. #define ENET_CALLBACK
  191. #define ENET_API extern
  192. #endif
  193. #ifndef ENET_BUFFER_MAXIMUM
  194. #define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS)
  195. #endif
  196. #define ENET_HOST_ANY in6addr_any
  197. #define ENET_PORT_ANY 0
  198. #define ENET_HOST_SIZE 1025
  199. #define ENET_HOST_TO_NET_16(value) (htons(value))
  200. #define ENET_HOST_TO_NET_32(value) (htonl(value))
  201. #define ENET_NET_TO_HOST_16(value) (ntohs(value))
  202. #define ENET_NET_TO_HOST_32(value) (ntohl(value))
  203. #ifdef __cplusplus
  204. extern "C" {
  205. #endif
  206. /*
  207. =======================================================================
  208. Internals
  209. =======================================================================
  210. */
  211. typedef uint8_t enet_uint8;
  212. typedef uint16_t enet_uint16;
  213. typedef uint32_t enet_uint32;
  214. typedef uint64_t enet_uint64;
  215. typedef enet_uint32 ENetVersion;
  216. typedef fd_set ENetSocketSet;
  217. typedef struct _ENetCallbacks {
  218. void* (ENET_CALLBACK* malloc)(size_t size);
  219. void (ENET_CALLBACK* free)(void* memory);
  220. void (ENET_CALLBACK* noMemory)(void);
  221. } ENetCallbacks;
  222. extern void* enet_malloc(size_t);
  223. extern void enet_free(void*);
  224. typedef struct _ENetListNode {
  225. struct _ENetListNode* next;
  226. struct _ENetListNode* previous;
  227. } ENetListNode;
  228. typedef ENetListNode* ENetListIterator;
  229. typedef struct _ENetList {
  230. ENetListNode sentinel;
  231. } ENetList;
  232. extern ENetListIterator enet_list_insert(ENetListIterator, void*);
  233. extern ENetListIterator enet_list_move(ENetListIterator, void*, void*);
  234. extern void* enet_list_remove(ENetListIterator);
  235. extern void enet_list_clear(ENetList*);
  236. extern size_t enet_list_size(ENetList*);
  237. #define enet_list_begin(list) ((list)->sentinel.next)
  238. #define enet_list_end(list) (&(list)->sentinel)
  239. #define enet_list_empty(list) (enet_list_begin(list) == enet_list_end(list))
  240. #define enet_list_next(iterator) ((iterator)->next)
  241. #define enet_list_previous(iterator) ((iterator)->previous)
  242. #define enet_list_front(list) ((void*)(list)->sentinel.next)
  243. #define enet_list_back(list) ((void*)(list)->sentinel.previous)
  244. #ifndef IN4ADDR
  245. #define IN4ADDR
  246. struct in4_addr {
  247. uint8_t zeros[10];
  248. uint16_t ffff;
  249. struct in_addr ip;
  250. };
  251. #endif
  252. /*
  253. =======================================================================
  254. Protocol
  255. =======================================================================
  256. */
  257. enum {
  258. ENET_PROTOCOL_MINIMUM_MTU = 576,
  259. ENET_PROTOCOL_MAXIMUM_MTU = 4096,
  260. ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS = 32,
  261. ENET_PROTOCOL_MINIMUM_WINDOW_SIZE = 4096,
  262. ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE = 65536,
  263. ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT = 1,
  264. ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT = 255,
  265. ENET_PROTOCOL_MAXIMUM_PEER_ID = 0xFFF,
  266. ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT = 1024 * 1024
  267. };
  268. typedef enum _ENetProtocolCommand {
  269. ENET_PROTOCOL_COMMAND_NONE = 0,
  270. ENET_PROTOCOL_COMMAND_ACKNOWLEDGE = 1,
  271. ENET_PROTOCOL_COMMAND_CONNECT = 2,
  272. ENET_PROTOCOL_COMMAND_VERIFY_CONNECT = 3,
  273. ENET_PROTOCOL_COMMAND_DISCONNECT = 4,
  274. ENET_PROTOCOL_COMMAND_PING = 5,
  275. ENET_PROTOCOL_COMMAND_SEND_RELIABLE = 6,
  276. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE = 7,
  277. ENET_PROTOCOL_COMMAND_SEND_FRAGMENT = 8,
  278. ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED = 9,
  279. ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT = 10,
  280. ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE = 11,
  281. ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT = 12,
  282. ENET_PROTOCOL_COMMAND_COUNT = 13,
  283. ENET_PROTOCOL_COMMAND_MASK = 0x0F
  284. } ENetProtocolCommand;
  285. typedef enum _ENetProtocolFlag {
  286. ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE = (1 << 7),
  287. ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED = (1 << 6),
  288. ENET_PROTOCOL_HEADER_FLAG_SENT_TIME = (1 << 14),
  289. ENET_PROTOCOL_HEADER_FLAG_COMPRESSED = (1 << 15),
  290. ENET_PROTOCOL_HEADER_FLAG_MASK = ENET_PROTOCOL_HEADER_FLAG_SENT_TIME | ENET_PROTOCOL_HEADER_FLAG_COMPRESSED,
  291. ENET_PROTOCOL_HEADER_SESSION_MASK = (3 << 12),
  292. ENET_PROTOCOL_HEADER_SESSION_SHIFT = 12
  293. } ENetProtocolFlag;
  294. #ifdef _MSC_VER
  295. #pragma pack(push, 1)
  296. #define ENET_PACKED
  297. #elif defined(__GNUC__) || defined(__clang__)
  298. #define ENET_PACKED __attribute__ ((packed))
  299. #else
  300. #define ENET_PACKED
  301. #endif
  302. typedef struct _ENetProtocolHeader {
  303. enet_uint16 peerID;
  304. enet_uint16 sentTime;
  305. } ENET_PACKED ENetProtocolHeader;
  306. typedef struct _ENetProtocolCommandHeader {
  307. enet_uint8 command;
  308. enet_uint8 channelID;
  309. enet_uint16 reliableSequenceNumber;
  310. } ENET_PACKED ENetProtocolCommandHeader;
  311. typedef struct _ENetProtocolAcknowledge {
  312. ENetProtocolCommandHeader header;
  313. enet_uint16 receivedReliableSequenceNumber;
  314. enet_uint16 receivedSentTime;
  315. } ENET_PACKED ENetProtocolAcknowledge;
  316. typedef struct _ENetProtocolConnect {
  317. ENetProtocolCommandHeader header;
  318. enet_uint16 outgoingPeerID;
  319. enet_uint8 incomingSessionID;
  320. enet_uint8 outgoingSessionID;
  321. enet_uint32 mtu;
  322. enet_uint32 windowSize;
  323. enet_uint32 channelCount;
  324. enet_uint32 incomingBandwidth;
  325. enet_uint32 outgoingBandwidth;
  326. enet_uint32 packetThrottleInterval;
  327. enet_uint32 packetThrottleAcceleration;
  328. enet_uint32 packetThrottleDeceleration;
  329. enet_uint32 connectID;
  330. enet_uint32 data;
  331. } ENET_PACKED ENetProtocolConnect;
  332. typedef struct _ENetProtocolVerifyConnect {
  333. ENetProtocolCommandHeader header;
  334. enet_uint16 outgoingPeerID;
  335. enet_uint8 incomingSessionID;
  336. enet_uint8 outgoingSessionID;
  337. enet_uint32 mtu;
  338. enet_uint32 windowSize;
  339. enet_uint32 channelCount;
  340. enet_uint32 incomingBandwidth;
  341. enet_uint32 outgoingBandwidth;
  342. enet_uint32 packetThrottleInterval;
  343. enet_uint32 packetThrottleAcceleration;
  344. enet_uint32 packetThrottleDeceleration;
  345. enet_uint32 connectID;
  346. } ENET_PACKED ENetProtocolVerifyConnect;
  347. typedef struct _ENetProtocolBandwidthLimit {
  348. ENetProtocolCommandHeader header;
  349. enet_uint32 incomingBandwidth;
  350. enet_uint32 outgoingBandwidth;
  351. } ENET_PACKED ENetProtocolBandwidthLimit;
  352. typedef struct _ENetProtocolThrottleConfigure {
  353. ENetProtocolCommandHeader header;
  354. enet_uint32 packetThrottleInterval;
  355. enet_uint32 packetThrottleAcceleration;
  356. enet_uint32 packetThrottleDeceleration;
  357. } ENET_PACKED ENetProtocolThrottleConfigure;
  358. typedef struct _ENetProtocolDisconnect {
  359. ENetProtocolCommandHeader header;
  360. enet_uint32 data;
  361. } ENET_PACKED ENetProtocolDisconnect;
  362. typedef struct _ENetProtocolPing {
  363. ENetProtocolCommandHeader header;
  364. } ENET_PACKED ENetProtocolPing;
  365. typedef struct _ENetProtocolSendReliable {
  366. ENetProtocolCommandHeader header;
  367. enet_uint16 dataLength;
  368. } ENET_PACKED ENetProtocolSendReliable;
  369. typedef struct _ENetProtocolSendUnreliable {
  370. ENetProtocolCommandHeader header;
  371. enet_uint16 unreliableSequenceNumber;
  372. enet_uint16 dataLength;
  373. } ENET_PACKED ENetProtocolSendUnreliable;
  374. typedef struct _ENetProtocolSendUnsequenced {
  375. ENetProtocolCommandHeader header;
  376. enet_uint16 unsequencedGroup;
  377. enet_uint16 dataLength;
  378. } ENET_PACKED ENetProtocolSendUnsequenced;
  379. typedef struct _ENetProtocolSendFragment {
  380. ENetProtocolCommandHeader header;
  381. enet_uint16 startSequenceNumber;
  382. enet_uint16 dataLength;
  383. enet_uint32 fragmentCount;
  384. enet_uint32 fragmentNumber;
  385. enet_uint32 totalLength;
  386. enet_uint32 fragmentOffset;
  387. } ENET_PACKED ENetProtocolSendFragment;
  388. typedef union _ENetProtocol {
  389. ENetProtocolCommandHeader header;
  390. ENetProtocolAcknowledge acknowledge;
  391. ENetProtocolConnect connect;
  392. ENetProtocolVerifyConnect verifyConnect;
  393. ENetProtocolDisconnect disconnect;
  394. ENetProtocolPing ping;
  395. ENetProtocolSendReliable sendReliable;
  396. ENetProtocolSendUnreliable sendUnreliable;
  397. ENetProtocolSendUnsequenced sendUnsequenced;
  398. ENetProtocolSendFragment sendFragment;
  399. ENetProtocolBandwidthLimit bandwidthLimit;
  400. ENetProtocolThrottleConfigure throttleConfigure;
  401. } ENET_PACKED ENetProtocol;
  402. #ifdef _MSC_VER
  403. #pragma pack(pop)
  404. #endif
  405. /*
  406. =======================================================================
  407. General structs/enums
  408. =======================================================================
  409. */
  410. typedef enum _ENetSocketType {
  411. ENET_SOCKET_TYPE_STREAM = 1,
  412. ENET_SOCKET_TYPE_DATAGRAM = 2
  413. } ENetSocketType;
  414. typedef enum _ENetSocketWait {
  415. ENET_SOCKET_WAIT_NONE = 0,
  416. ENET_SOCKET_WAIT_SEND = (1 << 0),
  417. ENET_SOCKET_WAIT_RECEIVE = (1 << 1),
  418. ENET_SOCKET_WAIT_INTERRUPT = (1 << 2)
  419. } ENetSocketWait;
  420. typedef enum _ENetSocketOption {
  421. ENET_SOCKOPT_NONBLOCK = 1,
  422. ENET_SOCKOPT_BROADCAST = 2,
  423. ENET_SOCKOPT_RCVBUF = 3,
  424. ENET_SOCKOPT_SNDBUF = 4,
  425. ENET_SOCKOPT_REUSEADDR = 5,
  426. ENET_SOCKOPT_RCVTIMEO = 6,
  427. ENET_SOCKOPT_SNDTIMEO = 7,
  428. ENET_SOCKOPT_ERROR = 8,
  429. ENET_SOCKOPT_NODELAY = 9,
  430. ENET_SOCKOPT_IPV6_V6ONLY = 10
  431. } ENetSocketOption;
  432. typedef enum _ENetSocketShutdown {
  433. ENET_SOCKET_SHUTDOWN_READ = 0,
  434. ENET_SOCKET_SHUTDOWN_WRITE = 1,
  435. ENET_SOCKET_SHUTDOWN_READ_WRITE = 2
  436. } ENetSocketShutdown;
  437. typedef struct _ENetAddress {
  438. union {
  439. struct in6_addr ipv6;
  440. struct in4_addr ipv4;
  441. };
  442. uint16_t port;
  443. } ENetAddress;
  444. #define in6_equal(a, b) (memcmp(&a, &b, sizeof(struct in6_addr)) == 0)
  445. typedef enum _ENetPacketFlag {
  446. ENET_PACKET_FLAG_NONE = 0,
  447. ENET_PACKET_FLAG_RELIABLE = (1 << 0),
  448. ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1),
  449. ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2),
  450. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED = (1 << 3),
  451. ENET_PACKET_FLAG_INSTANT = (1 << 4),
  452. ENET_PACKET_FLAG_SENT = (1 << 8)
  453. } ENetPacketFlag;
  454. typedef void (ENET_CALLBACK* ENetPacketFreeCallback)(void*);
  455. typedef struct _ENetPacket {
  456. enet_uint32 flags;
  457. enet_uint32 dataLength;
  458. enet_uint8* data;
  459. ENetPacketFreeCallback freeCallback;
  460. enet_uint32 referenceCount;
  461. } ENetPacket;
  462. typedef struct _ENetAcknowledgement {
  463. ENetListNode acknowledgementList;
  464. enet_uint32 sentTime;
  465. ENetProtocol command;
  466. } ENetAcknowledgement;
  467. typedef struct _ENetOutgoingCommand {
  468. ENetListNode outgoingCommandList;
  469. enet_uint16 reliableSequenceNumber;
  470. enet_uint16 unreliableSequenceNumber;
  471. enet_uint32 sentTime;
  472. enet_uint32 roundTripTimeout;
  473. enet_uint32 roundTripTimeoutLimit;
  474. enet_uint32 fragmentOffset;
  475. enet_uint16 fragmentLength;
  476. enet_uint16 sendAttempts;
  477. ENetProtocol command;
  478. ENetPacket* packet;
  479. } ENetOutgoingCommand;
  480. typedef struct _ENetIncomingCommand {
  481. ENetListNode incomingCommandList;
  482. enet_uint16 reliableSequenceNumber;
  483. enet_uint16 unreliableSequenceNumber;
  484. ENetProtocol command;
  485. enet_uint32 fragmentCount;
  486. enet_uint32 fragmentsRemaining;
  487. enet_uint32* fragments;
  488. ENetPacket* packet;
  489. } ENetIncomingCommand;
  490. typedef enum _ENetPeerState {
  491. ENET_PEER_STATE_DISCONNECTED = 0,
  492. ENET_PEER_STATE_CONNECTING = 1,
  493. ENET_PEER_STATE_ACKNOWLEDGING_CONNECT = 2,
  494. ENET_PEER_STATE_CONNECTION_PENDING = 3,
  495. ENET_PEER_STATE_CONNECTION_SUCCEEDED = 4,
  496. ENET_PEER_STATE_CONNECTED = 5,
  497. ENET_PEER_STATE_DISCONNECT_LATER = 6,
  498. ENET_PEER_STATE_DISCONNECTING = 7,
  499. ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT = 8,
  500. ENET_PEER_STATE_ZOMBIE = 9
  501. } ENetPeerState;
  502. enum {
  503. ENET_HOST_BUFFER_SIZE_MIN = 256 * 1024,
  504. ENET_HOST_BUFFER_SIZE_MAX = 1024 * 1024,
  505. ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000,
  506. ENET_HOST_DEFAULT_MTU = 1280,
  507. ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024,
  508. ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
  509. ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 500,
  510. ENET_PEER_DEFAULT_PACKET_THROTTLE = 32,
  511. ENET_PEER_PACKET_THROTTLE_SCALE = 32,
  512. ENET_PEER_PACKET_THROTTLE_COUNTER = 7,
  513. ENET_PEER_PACKET_THROTTLE_ACCELERATION = 2,
  514. ENET_PEER_PACKET_THROTTLE_DECELERATION = 2,
  515. ENET_PEER_PACKET_THROTTLE_INTERVAL = 5000,
  516. ENET_PEER_PACKET_LOSS_SCALE = (1 << 16),
  517. ENET_PEER_PACKET_LOSS_INTERVAL = 10000,
  518. ENET_PEER_WINDOW_SIZE_SCALE = 64 * 1024,
  519. ENET_PEER_TIMEOUT_LIMIT = 32,
  520. ENET_PEER_TIMEOUT_MINIMUM = 5000,
  521. ENET_PEER_TIMEOUT_MAXIMUM = 30000,
  522. ENET_PEER_PING_INTERVAL = 500,
  523. ENET_PEER_UNSEQUENCED_WINDOWS = 64,
  524. ENET_PEER_UNSEQUENCED_WINDOW_SIZE = 1024,
  525. ENET_PEER_FREE_UNSEQUENCED_WINDOWS = 32,
  526. ENET_PEER_RELIABLE_WINDOWS = 16,
  527. ENET_PEER_RELIABLE_WINDOW_SIZE = 0x1000,
  528. ENET_PEER_FREE_RELIABLE_WINDOWS = 8
  529. };
  530. typedef struct _ENetChannel {
  531. enet_uint16 outgoingReliableSequenceNumber;
  532. enet_uint16 outgoingUnreliableSequenceNumber;
  533. enet_uint16 usedReliableWindows;
  534. enet_uint16 reliableWindows[ENET_PEER_RELIABLE_WINDOWS];
  535. enet_uint16 incomingReliableSequenceNumber;
  536. enet_uint16 incomingUnreliableSequenceNumber;
  537. ENetList incomingReliableCommands;
  538. ENetList incomingUnreliableCommands;
  539. } ENetChannel;
  540. typedef struct _ENetPeer {
  541. ENetListNode dispatchList;
  542. struct _ENetHost* host;
  543. enet_uint16 outgoingPeerID;
  544. enet_uint16 incomingPeerID;
  545. enet_uint32 connectID;
  546. enet_uint8 outgoingSessionID;
  547. enet_uint8 incomingSessionID;
  548. ENetAddress address;
  549. void* data;
  550. ENetPeerState state;
  551. ENetChannel* channels;
  552. size_t channelCount;
  553. enet_uint32 incomingBandwidth;
  554. enet_uint32 outgoingBandwidth;
  555. enet_uint32 incomingBandwidthThrottleEpoch;
  556. enet_uint32 outgoingBandwidthThrottleEpoch;
  557. enet_uint32 incomingDataTotal;
  558. enet_uint64 totalDataReceived;
  559. enet_uint32 outgoingDataTotal;
  560. enet_uint64 totalDataSent;
  561. enet_uint32 lastSendTime;
  562. enet_uint32 lastReceiveTime;
  563. enet_uint32 nextTimeout;
  564. enet_uint32 earliestTimeout;
  565. enet_uint32 packetLossEpoch;
  566. enet_uint32 packetsSent;
  567. enet_uint64 totalPacketsSent;
  568. enet_uint32 packetsLost;
  569. enet_uint64 totalPacketsLost;
  570. enet_uint32 packetLoss;
  571. enet_uint32 packetLossVariance;
  572. enet_uint32 packetThrottle;
  573. enet_uint32 packetThrottleThreshold;
  574. enet_uint32 packetThrottleLimit;
  575. enet_uint32 packetThrottleCounter;
  576. enet_uint32 packetThrottleEpoch;
  577. enet_uint32 packetThrottleAcceleration;
  578. enet_uint32 packetThrottleDeceleration;
  579. enet_uint32 packetThrottleInterval;
  580. enet_uint32 pingInterval;
  581. enet_uint32 timeoutLimit;
  582. enet_uint32 timeoutMinimum;
  583. enet_uint32 timeoutMaximum;
  584. enet_uint32 smoothedRoundTripTime;
  585. enet_uint32 lastRoundTripTime;
  586. enet_uint32 lowestRoundTripTime;
  587. enet_uint32 lastRoundTripTimeVariance;
  588. enet_uint32 highestRoundTripTimeVariance;
  589. enet_uint32 roundTripTime;
  590. enet_uint32 roundTripTimeVariance;
  591. enet_uint32 mtu;
  592. enet_uint32 windowSize;
  593. enet_uint32 reliableDataInTransit;
  594. enet_uint16 outgoingReliableSequenceNumber;
  595. ENetList acknowledgements;
  596. ENetList sentReliableCommands;
  597. ENetList sentUnreliableCommands;
  598. ENetList outgoingReliableCommands;
  599. ENetList outgoingUnreliableCommands;
  600. ENetList dispatchedCommands;
  601. int needsDispatch;
  602. enet_uint16 incomingUnsequencedGroup;
  603. enet_uint16 outgoingUnsequencedGroup;
  604. enet_uint32 unsequencedWindow[ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32];
  605. enet_uint32 eventData;
  606. size_t totalWaitingData;
  607. } ENetPeer;
  608. typedef enet_uint32(ENET_CALLBACK* ENetChecksumCallback)(const ENetBuffer* buffers, size_t bufferCount);
  609. typedef int (ENET_CALLBACK* ENetInterceptCallback)(struct _ENetHost* host, void* event);
  610. typedef struct _ENetHost {
  611. ENetSocket socket;
  612. ENetAddress address;
  613. enet_uint32 incomingBandwidth;
  614. enet_uint32 outgoingBandwidth;
  615. enet_uint32 bandwidthThrottleEpoch;
  616. enet_uint32 mtu;
  617. enet_uint32 randomSeed;
  618. int recalculateBandwidthLimits;
  619. enet_uint8 preventConnections;
  620. ENetPeer* peers;
  621. size_t peerCount;
  622. size_t channelLimit;
  623. enet_uint32 serviceTime;
  624. ENetList dispatchQueue;
  625. int continueSending;
  626. size_t packetSize;
  627. enet_uint16 headerFlags;
  628. enet_uint32 totalSentData;
  629. enet_uint32 totalSentPackets;
  630. enet_uint32 totalReceivedData;
  631. enet_uint32 totalReceivedPackets;
  632. ENetProtocol commands[ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
  633. size_t commandCount;
  634. ENetBuffer buffers[ENET_BUFFER_MAXIMUM];
  635. size_t bufferCount;
  636. enet_uint8 compression;
  637. char* compressionBuffer;
  638. size_t compressionBufferSize;
  639. ENetChecksumCallback checksumCallback;
  640. enet_uint8 packetData[2][ENET_PROTOCOL_MAXIMUM_MTU];
  641. ENetAddress receivedAddress;
  642. enet_uint8* receivedData;
  643. size_t receivedDataLength;
  644. ENetInterceptCallback interceptCallback;
  645. size_t connectedPeers;
  646. size_t bandwidthLimitedPeers;
  647. size_t duplicatePeers;
  648. size_t maximumPacketSize;
  649. size_t maximumWaitingData;
  650. } ENetHost;
  651. typedef enum _ENetEventType {
  652. ENET_EVENT_TYPE_NONE = 0,
  653. ENET_EVENT_TYPE_CONNECT = 1,
  654. ENET_EVENT_TYPE_DISCONNECT = 2,
  655. ENET_EVENT_TYPE_RECEIVE = 3,
  656. ENET_EVENT_TYPE_DISCONNECT_TIMEOUT = 4
  657. } ENetEventType;
  658. typedef struct _ENetEvent {
  659. ENetEventType type;
  660. ENetPeer* peer;
  661. enet_uint8 channelID;
  662. enet_uint32 data;
  663. ENetPacket* packet;
  664. } ENetEvent;
  665. /*
  666. =======================================================================
  667. Public API
  668. =======================================================================
  669. */
  670. ENET_API int enet_initialize(void);
  671. ENET_API int enet_initialize_with_callbacks(ENetVersion, const ENetCallbacks*);
  672. ENET_API void enet_deinitialize(void);
  673. ENET_API ENetVersion enet_linked_version(void);
  674. ENET_API int enet_array_is_zeroed(const uint8_t*, int);
  675. ENET_API size_t enet_string_copy(char*, const char*, size_t);
  676. ENET_API enet_uint32 enet_time_get(void);
  677. ENET_API enet_uint32 enet_crc32(const ENetBuffer*, size_t);
  678. ENET_API ENetPacket* enet_packet_create(const void*, size_t, enet_uint32);
  679. ENET_API ENetPacket* enet_packet_create_offset(const void*, size_t, size_t, enet_uint32);
  680. ENET_API void enet_packet_destroy(ENetPacket*);
  681. ENET_API int enet_peer_send(ENetPeer*, enet_uint8, ENetPacket*);
  682. ENET_API ENetPacket* enet_peer_receive(ENetPeer*, enet_uint8*);
  683. ENET_API void enet_peer_ping(ENetPeer*);
  684. ENET_API void enet_peer_ping_interval(ENetPeer*, enet_uint32);
  685. ENET_API void enet_peer_timeout(ENetPeer*, enet_uint32, enet_uint32, enet_uint32);
  686. ENET_API void enet_peer_reset(ENetPeer*);
  687. ENET_API void enet_peer_disconnect(ENetPeer*, enet_uint32);
  688. ENET_API void enet_peer_disconnect_now(ENetPeer*, enet_uint32);
  689. ENET_API void enet_peer_disconnect_later(ENetPeer*, enet_uint32);
  690. ENET_API void enet_peer_throttle_configure(ENetPeer*, enet_uint32, enet_uint32, enet_uint32, enet_uint32);
  691. ENET_API ENetHost* enet_host_create(const ENetAddress*, size_t, size_t, enet_uint32, enet_uint32, int);
  692. ENET_API void enet_host_destroy(ENetHost*);
  693. ENET_API void enet_host_enable_compression(ENetHost*);
  694. ENET_API void enet_host_prevent_connections(ENetHost*, enet_uint8);
  695. ENET_API ENetPeer* enet_host_connect(ENetHost*, const ENetAddress*, size_t, enet_uint32);
  696. ENET_API int enet_host_check_events(ENetHost*, ENetEvent*);
  697. ENET_API int enet_host_service(ENetHost*, ENetEvent*, enet_uint32);
  698. ENET_API void enet_host_flush(ENetHost*);
  699. ENET_API void enet_host_broadcast(ENetHost*, enet_uint8, ENetPacket*);
  700. ENET_API void enet_host_broadcast_exclude(ENetHost*, enet_uint8, ENetPacket*, ENetPeer*);
  701. ENET_API void enet_host_broadcast_selective(ENetHost*, enet_uint8, ENetPacket*, ENetPeer**, size_t);
  702. ENET_API void enet_host_channel_limit(ENetHost*, size_t);
  703. ENET_API void enet_host_bandwidth_limit(ENetHost*, enet_uint32, enet_uint32);
  704. ENET_API int enet_address_set_host_ip(ENetAddress*, const char*);
  705. ENET_API int enet_address_set_host(ENetAddress*, const char*);
  706. ENET_API int enet_address_get_host_ip(const ENetAddress*, char*, size_t);
  707. ENET_API int enet_address_get_host(const ENetAddress*, char*, size_t);
  708. ENET_API ENetSocket enet_socket_create(ENetSocketType);
  709. ENET_API int enet_socket_bind(ENetSocket, const ENetAddress*);
  710. ENET_API int enet_socket_get_address(ENetSocket, ENetAddress*);
  711. ENET_API int enet_socket_listen(ENetSocket, int);
  712. ENET_API ENetSocket enet_socket_accept(ENetSocket, ENetAddress*);
  713. ENET_API int enet_socket_connect(ENetSocket, const ENetAddress*);
  714. ENET_API int enet_socket_send(ENetSocket, const ENetAddress*, const ENetBuffer*, size_t);
  715. ENET_API int enet_socket_receive(ENetSocket, ENetAddress*, ENetBuffer*, size_t);
  716. ENET_API int enet_socket_wait(ENetSocket, enet_uint32*, enet_uint64);
  717. ENET_API int enet_socket_set_option(ENetSocket, ENetSocketOption, int);
  718. ENET_API int enet_socket_get_option(ENetSocket, ENetSocketOption, int*);
  719. ENET_API int enet_socket_shutdown(ENetSocket, ENetSocketShutdown);
  720. ENET_API void enet_socket_destroy(ENetSocket);
  721. ENET_API int enet_socket_set_select(ENetSocket, ENetSocketSet*, ENetSocketSet*, enet_uint32);
  722. /* Extended API for easier binding in other programming languages */
  723. ENET_API void* enet_packet_get_data(const ENetPacket*);
  724. ENET_API int enet_packet_get_length(const ENetPacket*);
  725. ENET_API void enet_packet_set_free_callback(ENetPacket*, const void*);
  726. ENET_API int enet_packet_check_references(const ENetPacket*);
  727. ENET_API void enet_packet_dispose(ENetPacket*);
  728. ENET_API enet_uint32 enet_host_get_peers_count(const ENetHost*);
  729. ENET_API enet_uint32 enet_host_get_packets_sent(const ENetHost*);
  730. ENET_API enet_uint32 enet_host_get_packets_received(const ENetHost*);
  731. ENET_API enet_uint32 enet_host_get_bytes_sent(const ENetHost*);
  732. ENET_API enet_uint32 enet_host_get_bytes_received(const ENetHost*);
  733. ENET_API enet_uint32 enet_peer_get_id(const ENetPeer*);
  734. ENET_API int enet_peer_get_ip(const ENetPeer*, char*, size_t);
  735. ENET_API enet_uint16 enet_peer_get_port(const ENetPeer*);
  736. ENET_API enet_uint32 enet_peer_get_mtu(const ENetPeer*);
  737. ENET_API ENetPeerState enet_peer_get_state(const ENetPeer*);
  738. ENET_API enet_uint32 enet_peer_get_rtt(const ENetPeer*);
  739. ENET_API enet_uint32 enet_peer_get_lastsendtime(const ENetPeer*);
  740. ENET_API enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer*);
  741. ENET_API enet_uint64 enet_peer_get_packets_sent(const ENetPeer*);
  742. ENET_API enet_uint64 enet_peer_get_packets_lost(const ENetPeer*);
  743. ENET_API enet_uint64 enet_peer_get_bytes_sent(const ENetPeer*);
  744. ENET_API enet_uint64 enet_peer_get_bytes_received(const ENetPeer*);
  745. ENET_API void* enet_peer_get_data(const ENetPeer*);
  746. ENET_API void enet_peer_set_data(ENetPeer*, const void*);
  747. /*
  748. =======================================================================
  749. Private API
  750. =======================================================================
  751. */
  752. extern void enet_host_bandwidth_throttle(ENetHost*);
  753. extern enet_uint64 enet_host_random_seed(void);
  754. extern int enet_peer_throttle(ENetPeer*, enet_uint32);
  755. extern void enet_peer_reset_queues(ENetPeer*);
  756. extern void enet_peer_setup_outgoing_command(ENetPeer*, ENetOutgoingCommand*);
  757. extern ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer*, const ENetProtocol*, ENetPacket*, enet_uint32, enet_uint16);
  758. extern ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer*, const ENetProtocol*, const void*, size_t, enet_uint32, enet_uint32);
  759. extern ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer*, const ENetProtocol*, enet_uint16);
  760. extern void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer*, ENetChannel*);
  761. extern void enet_peer_dispatch_incoming_reliable_commands(ENetPeer*, ENetChannel*);
  762. extern void enet_peer_on_connect(ENetPeer*);
  763. extern void enet_peer_on_disconnect(ENetPeer*);
  764. extern size_t enet_protocol_command_size(enet_uint8);
  765. #ifdef __cplusplus
  766. }
  767. #endif
  768. #if defined(ENET_IMPLEMENTATION) && !defined(ENET_IMPLEMENTATION_DONE)
  769. #define ENET_IMPLEMENTATION_DONE 1
  770. #ifdef __cplusplus
  771. extern "C" {
  772. #endif
  773. #ifdef __MINGW32__
  774. #include "mingw/inet_ntop.c"
  775. #include "mingw/inet_pton.c"
  776. #endif
  777. /*
  778. =======================================================================
  779. Atomics
  780. =======================================================================
  781. */
  782. #ifdef _MSC_VER
  783. #define ENET_AT_CASSERT_PRED(predicate) sizeof(char[2 * !!(predicate) - 1])
  784. #define ENET_IS_SUPPORTED_ATOMIC(size) ENET_AT_CASSERT_PRED(size == 1 || size == 2 || size == 4 || size == 8)
  785. #define ENET_ATOMIC_SIZEOF(variable) (ENET_IS_SUPPORTED_ATOMIC(sizeof(*(variable))), sizeof(*(variable)))
  786. __inline int64_t enet_at_atomic_read(char* ptr, size_t size) {
  787. switch (size) {
  788. case 1:
  789. return _InterlockedExchangeAdd8((volatile char*)ptr, 0);
  790. case 2:
  791. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, 0);
  792. case 4:
  793. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  794. return InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  795. #else
  796. return _InterlockedExchangeAdd((volatile LONG*)ptr, 0);
  797. #endif
  798. case 8:
  799. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  800. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  801. #else
  802. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
  803. #endif
  804. default:
  805. return 0x0;
  806. }
  807. }
  808. __inline int64_t enet_at_atomic_write(char* ptr, int64_t value, size_t size) {
  809. switch (size) {
  810. case 1:
  811. return _InterlockedExchange8((volatile char*)ptr, (char)value);
  812. case 2:
  813. return _InterlockedExchange16((volatile SHORT*)ptr, (SHORT)value);
  814. case 4:
  815. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  816. return InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  817. #else
  818. return _InterlockedExchange((volatile LONG*)ptr, (LONG)value);
  819. #endif
  820. case 8:
  821. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  822. return InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  823. #else
  824. return _InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
  825. #endif
  826. default:
  827. return 0x0;
  828. }
  829. }
  830. __inline int64_t enet_at_atomic_cas(char* ptr, int64_t new_val, int64_t old_val, size_t size) {
  831. switch (size) {
  832. case 1:
  833. return _InterlockedCompareExchange8((volatile char*)ptr, (char)new_val, (char)old_val);
  834. case 2:
  835. return _InterlockedCompareExchange16((volatile SHORT*)ptr, (SHORT)new_val, (SHORT)old_val);
  836. case 4:
  837. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  838. return InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  839. #else
  840. return _InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
  841. #endif
  842. case 8:
  843. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  844. return InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  845. #else
  846. return _InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
  847. #endif
  848. default:
  849. return 0x0;
  850. }
  851. }
  852. __inline int64_t enet_at_atomic_inc(char* ptr, int64_t delta, size_t data_size) {
  853. switch (data_size) {
  854. case 1:
  855. return _InterlockedExchangeAdd8((volatile char*)ptr, (char)delta);
  856. case 2:
  857. return _InterlockedExchangeAdd16((volatile SHORT*)ptr, (SHORT)delta);
  858. case 4:
  859. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  860. return InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  861. #else
  862. return _InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
  863. #endif
  864. case 8:
  865. #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
  866. return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  867. #else
  868. return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
  869. #endif
  870. default:
  871. return 0x0;
  872. }
  873. }
  874. #define ENET_ATOMIC_READ(variable) enet_at_atomic_read((char*)(variable), ENET_ATOMIC_SIZEOF(variable))
  875. #define ENET_ATOMIC_WRITE(variable, new_val) enet_at_atomic_write((char*)(variable), (int64_t)(new_val), ENET_ATOMIC_SIZEOF(variable))
  876. #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))
  877. #define ENET_ATOMIC_INC(variable) enet_at_atomic_inc((char*)(variable), 1, ENET_ATOMIC_SIZEOF(variable))
  878. #define ENET_ATOMIC_DEC(variable) enet_at_atomic_inc((char*)(variable), -1, ENET_ATOMIC_SIZEOF(variable))
  879. #define ENET_ATOMIC_INC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), (delta), ENET_ATOMIC_SIZEOF(variable))
  880. #define ENET_ATOMIC_DEC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), -(delta), ENET_ATOMIC_SIZEOF(variable))
  881. #elif defined(__GNUC__) || defined(__clang__)
  882. #if defined(__clang__) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
  883. #define AT_HAVE_ATOMICS
  884. #endif
  885. /* We want to use __atomic built-ins if possible because the __sync primitives are
  886. deprecated, because the __atomic build-ins allow us to use ENET_ATOMIC_WRITE on
  887. uninitialized memory without running into undefined behavior, and because the
  888. __atomic versions generate more efficient code since we don't need to rely on
  889. CAS when we don't actually want it.
  890. Note that we use acquire-release memory order (like mutexes do). We could use
  891. sequentially consistent memory order but that has lower performance and is
  892. almost always unneeded. */
  893. #ifdef AT_HAVE_ATOMICS
  894. #define ENET_ATOMIC_READ(ptr) __atomic_load_n((ptr), __ATOMIC_ACQUIRE)
  895. #define ENET_ATOMIC_WRITE(ptr, value) __atomic_store_n((ptr), (value), __ATOMIC_RELEASE)
  896. #ifndef typeof
  897. #define typeof __typeof__
  898. #endif
  899. /* clang_analyzer doesn't know that CAS writes to memory so it complains about
  900. potentially lost data. Replace the code with the equivalent non-sync code. */
  901. #ifdef __clang_analyzer__
  902. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  903. ({ \
  904. typeof(*(ptr)) ENET_ATOMIC_CAS_old_actual_ = (*(ptr)); \
  905. if (ATOMIC_CAS_old_actual_ == (old_value)) \
  906. *(ptr) = new_value; \
  907. ENET_ATOMIC_CAS_old_actual_; \
  908. })
  909. #else
  910. /* Could use __auto_type instead of typeof but that shouldn't work in C++.
  911. The ({ }) syntax is a GCC extension called statement expression. It lets
  912. us return a value out of the macro.
  913. TODO We should return bool here instead of the old value to avoid the ABA
  914. problem. */
  915. #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \
  916. ({ \
  917. typeof(*(ptr)) ENET_ATOMIC_CAS_expected_ = (old_value); \
  918. __atomic_compare_exchange_n((ptr), &ENET_ATOMIC_CAS_expected_, (new_value), false, \
  919. __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE); \
  920. ENET_ATOMIC_CAS_expected_; \
  921. })
  922. #endif
  923. #define ENET_ATOMIC_INC(ptr) __atomic_fetch_add((ptr), 1, __ATOMIC_ACQ_REL)
  924. #define ENET_ATOMIC_DEC(ptr) __atomic_fetch_sub((ptr), 1, __ATOMIC_ACQ_REL)
  925. #define ENET_ATOMIC_INC_BY(ptr, delta) __atomic_fetch_add((ptr), (delta), __ATOMIC_ACQ_REL)
  926. #define ENET_ATOMIC_DEC_BY(ptr, delta) __atomic_fetch_sub((ptr), (delta), __ATOMIC_ACQ_REL)
  927. #else
  928. #define ENET_ATOMIC_READ(variable) __sync_fetch_and_add(variable, 0)
  929. #define ENET_ATOMIC_WRITE(variable, new_val) (void)__sync_val_compare_and_swap((variable), *(variable), (new_val))
  930. #define ENET_ATOMIC_CAS(variable, old_value, new_val) __sync_val_compare_and_swap((variable), (old_value), (new_val))
  931. #define ENET_ATOMIC_INC(variable) __sync_fetch_and_add((variable), 1)
  932. #define ENET_ATOMIC_DEC(variable) __sync_fetch_and_sub((variable), 1)
  933. #define ENET_ATOMIC_INC_BY(variable, delta) __sync_fetch_and_add((variable), (delta), 1)
  934. #define ENET_ATOMIC_DEC_BY(variable, delta) __sync_fetch_and_sub((variable), (delta), 1)
  935. #endif
  936. #undef AT_HAVE_ATOMICS
  937. #endif
  938. /*
  939. =======================================================================
  940. Callbacks
  941. =======================================================================
  942. */
  943. static ENetCallbacks callbacks = {
  944. malloc,
  945. free,
  946. abort
  947. };
  948. int enet_initialize_with_callbacks(ENetVersion version, const ENetCallbacks* inits) {
  949. if (version < ENET_VERSION_CREATE(1, 3, 0))
  950. {
  951. ENET_LOG_ERROR("ENET version is too old");
  952. return ENET_LIBRARY_TOO_OLD;
  953. }
  954. if (inits->malloc != NULL || inits->free != NULL) {
  955. if (inits->malloc == NULL || inits->free == NULL) {
  956. ENET_LOG_ERROR("memory allocator or free thingy is NULL");
  957. return ENET_LIBRARY_MEMALLOC_NULL;
  958. }
  959. callbacks.malloc = inits->malloc;
  960. callbacks.free = inits->free;
  961. }
  962. if (inits->noMemory != NULL)
  963. callbacks.noMemory = inits->noMemory;
  964. return enet_initialize();
  965. }
  966. void* enet_malloc(size_t size) {
  967. void* memory = callbacks.malloc(size);
  968. if (memory == NULL)
  969. callbacks.noMemory();
  970. return memory;
  971. }
  972. void enet_free(void* memory) {
  973. callbacks.free(memory);
  974. }
  975. /*
  976. =======================================================================
  977. List
  978. =======================================================================
  979. */
  980. void enet_list_clear(ENetList* list) {
  981. list->sentinel.next = &list->sentinel;
  982. list->sentinel.previous = &list->sentinel;
  983. }
  984. ENetListIterator enet_list_insert(ENetListIterator position, void* data) {
  985. ENetListIterator result = (ENetListIterator)data;
  986. result->previous = position->previous;
  987. result->next = position;
  988. result->previous->next = result;
  989. position->previous = result;
  990. return result;
  991. }
  992. void* enet_list_remove(ENetListIterator position) {
  993. position->previous->next = position->next;
  994. position->next->previous = position->previous;
  995. return position;
  996. }
  997. ENetListIterator enet_list_move(ENetListIterator position, void* dataFirst, void* dataLast) {
  998. ENetListIterator first = (ENetListIterator)dataFirst;
  999. ENetListIterator last = (ENetListIterator)dataLast;
  1000. first->previous->next = last->next;
  1001. last->next->previous = first->previous;
  1002. first->previous = position->previous;
  1003. last->next = position;
  1004. first->previous->next = first;
  1005. position->previous = last;
  1006. return first;
  1007. }
  1008. size_t enet_list_size(ENetList* list) {
  1009. size_t size = 0;
  1010. ENetListIterator position;
  1011. for (position = enet_list_begin(list); position != enet_list_end(list); position = enet_list_next(position)) {
  1012. ++size;
  1013. }
  1014. return size;
  1015. }
  1016. /*
  1017. =======================================================================
  1018. Utilities
  1019. =======================================================================
  1020. */
  1021. ENetVersion enet_linked_version(void) {
  1022. return ENET_VERSION;
  1023. }
  1024. int enet_array_is_zeroed(const uint8_t* array, int length) {
  1025. size_t i;
  1026. for (i = 0; i < length; i++) {
  1027. if (array[i] != 0)
  1028. return -1;
  1029. }
  1030. return 0;
  1031. }
  1032. size_t enet_string_copy(char* destination, const char* source, size_t length) {
  1033. char* d = destination;
  1034. const char* s = source;
  1035. size_t n = length;
  1036. if (n != 0 && --n != 0) {
  1037. do {
  1038. if ((*d++ = *s++) == 0)
  1039. break;
  1040. }
  1041. while (--n != 0);
  1042. }
  1043. if (n == 0) {
  1044. if (length != 0)
  1045. * d = '\0';
  1046. while (*s++);
  1047. }
  1048. return (s - source - 1);
  1049. }
  1050. /*
  1051. =======================================================================
  1052. Time
  1053. =======================================================================
  1054. */
  1055. #ifdef _WIN32
  1056. static LARGE_INTEGER gettime_offset(void) {
  1057. SYSTEMTIME s;
  1058. FILETIME f;
  1059. LARGE_INTEGER t;
  1060. s.wYear = 1970;
  1061. s.wMonth = 1;
  1062. s.wDay = 1;
  1063. s.wHour = 0;
  1064. s.wMinute = 0;
  1065. s.wSecond = 0;
  1066. s.wMilliseconds = 0;
  1067. SystemTimeToFileTime(&s, &f);
  1068. t.QuadPart = f.dwHighDateTime;
  1069. t.QuadPart <<= 32;
  1070. t.QuadPart |= f.dwLowDateTime;
  1071. return t;
  1072. }
  1073. int clock_gettime(int X, struct timespec* tv) {
  1074. LARGE_INTEGER t;
  1075. FILETIME f;
  1076. double microseconds;
  1077. static LARGE_INTEGER offset;
  1078. static double frequencyToMicroseconds;
  1079. static int initialized = 0;
  1080. static BOOL usePerformanceCounter = 0;
  1081. if (!initialized) {
  1082. LARGE_INTEGER performanceFrequency;
  1083. initialized = 1;
  1084. usePerformanceCounter = QueryPerformanceFrequency(&performanceFrequency);
  1085. if (usePerformanceCounter) {
  1086. QueryPerformanceCounter(&offset);
  1087. frequencyToMicroseconds = (double)performanceFrequency.QuadPart / 1000000.;
  1088. }
  1089. else {
  1090. offset = gettime_offset();
  1091. frequencyToMicroseconds = 10.;
  1092. }
  1093. }
  1094. if (usePerformanceCounter) {
  1095. QueryPerformanceCounter(&t);
  1096. }
  1097. else {
  1098. GetSystemTimeAsFileTime(&f);
  1099. t.QuadPart = f.dwHighDateTime;
  1100. t.QuadPart <<= 32;
  1101. t.QuadPart |= f.dwLowDateTime;
  1102. }
  1103. t.QuadPart -= offset.QuadPart;
  1104. microseconds = (double)t.QuadPart / frequencyToMicroseconds;
  1105. t.QuadPart = (LONGLONG)microseconds;
  1106. tv->tv_sec = (long)(t.QuadPart / 1000000);
  1107. tv->tv_nsec = t.QuadPart % 1000000 * 1000;
  1108. return 0;
  1109. }
  1110. // Coburn: this fixes devices on iOS <10.0 from causing a E_ARM_BREAKPOINT and making XCode Debugger angery
  1111. #elif __APPLE__ && (__MAC_OS_X_VERSION_MIN_REQUIRED < 101200 || __IPHONE_OS_VERSION_MIN_REQUIRED < 100000) && !defined(CLOCK_MONOTONIC)
  1112. #define CLOCK_MONOTONIC 0
  1113. int clock_gettime(int X, struct timespec* ts) {
  1114. clock_serv_t cclock;
  1115. mach_timespec_t mts;
  1116. host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
  1117. clock_get_time(cclock, &mts);
  1118. mach_port_deallocate(mach_task_self(), cclock);
  1119. ts->tv_sec = mts.tv_sec;
  1120. ts->tv_nsec = mts.tv_nsec;
  1121. return 0;
  1122. }
  1123. #endif
  1124. enet_uint32 enet_time_get(void) {
  1125. static enet_uint64 start_time_ns = 0;
  1126. struct timespec ts;
  1127. // c6: what the [redacted] fuck is clock_monotonic_raw??????
  1128. // c6: just use clock monotonic
  1129. // Coburn: sir yes sir
  1130. clock_gettime(CLOCK_MONOTONIC, &ts);
  1131. static const enet_uint64 ns_in_s = 1000 * 1000 * 1000;
  1132. static const enet_uint64 ns_in_ms = 1000 * 1000;
  1133. enet_uint64 current_time_ns = ts.tv_nsec + (enet_uint64)ts.tv_sec * ns_in_s;
  1134. enet_uint64 offset_ns = ENET_ATOMIC_READ(&start_time_ns);
  1135. if (offset_ns == 0) {
  1136. enet_uint64 want_value = current_time_ns - 1 * ns_in_ms;
  1137. enet_uint64 old_value = ENET_ATOMIC_CAS(&start_time_ns, 0, want_value);
  1138. offset_ns = old_value == 0 ? want_value : old_value;
  1139. }
  1140. enet_uint64 result_in_ns = current_time_ns - offset_ns;
  1141. return (enet_uint32)(result_in_ns / ns_in_ms);
  1142. }
  1143. /*
  1144. =======================================================================
  1145. Checksum
  1146. =======================================================================
  1147. */
  1148. static int initializedCRC32 = 0;
  1149. static enet_uint32 crcTable[256];
  1150. static enet_uint32 reflect_crc(int val, int bits) {
  1151. int result = 0, bit;
  1152. for (bit = 0; bit < bits; bit++) {
  1153. if (val & 1)
  1154. result |= 1 << (bits - 1 - bit);
  1155. val >>= 1;
  1156. }
  1157. return result;
  1158. }
  1159. static void initialize_crc32(void) {
  1160. int byte;
  1161. for (byte = 0; byte < 256; ++byte) {
  1162. enet_uint32 crc = reflect_crc(byte, 8) << 24;
  1163. int offset;
  1164. for (offset = 0; offset < 8; ++offset) {
  1165. if (crc & 0x80000000)
  1166. crc = (crc << 1) ^ 0x04c11db7;
  1167. else
  1168. crc <<= 1;
  1169. }
  1170. crcTable[byte] = reflect_crc(crc, 32);
  1171. }
  1172. initializedCRC32 = 1;
  1173. }
  1174. enet_uint32 enet_crc32(const ENetBuffer* buffers, size_t bufferCount) {
  1175. enet_uint32 crc = 0xFFFFFFFF;
  1176. if (!initializedCRC32)
  1177. initialize_crc32();
  1178. while (bufferCount-- > 0) {
  1179. const enet_uint8* data = (const enet_uint8*)buffers->data;
  1180. const enet_uint8* dataEnd = &data[buffers->dataLength];
  1181. while (data < dataEnd) {
  1182. crc = (crc >> 8) ^ crcTable[(crc & 0xFF) ^ *data++];
  1183. }
  1184. ++buffers;
  1185. }
  1186. return ENET_HOST_TO_NET_32(~crc);
  1187. }
  1188. /*
  1189. =======================================================================
  1190. Packet
  1191. =======================================================================
  1192. */
  1193. ENetPacket* enet_packet_create(const void* data, size_t dataLength, enet_uint32 flags) {
  1194. ENetPacket* packet;
  1195. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1196. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1197. if (packet == NULL)
  1198. return NULL;
  1199. packet->data = (enet_uint8*)data;
  1200. }
  1201. else {
  1202. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength);
  1203. if (packet == NULL)
  1204. return NULL;
  1205. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1206. if (data != NULL)
  1207. memcpy(packet->data, data, dataLength);
  1208. }
  1209. packet->referenceCount = 0;
  1210. packet->flags = flags;
  1211. packet->dataLength = dataLength;
  1212. packet->freeCallback = NULL;
  1213. return packet;
  1214. }
  1215. ENetPacket* enet_packet_create_offset(const void* data, size_t dataLength, size_t dataOffset, enet_uint32 flags) {
  1216. ENetPacket* packet;
  1217. if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) {
  1218. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket));
  1219. if (packet == NULL)
  1220. return NULL;
  1221. packet->data = (enet_uint8*)data;
  1222. }
  1223. else {
  1224. packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength - dataOffset);
  1225. if (packet == NULL)
  1226. return NULL;
  1227. packet->data = (enet_uint8*)packet + sizeof(ENetPacket);
  1228. if (data != NULL)
  1229. memcpy(packet->data, (char*)data + dataOffset, dataLength - dataOffset);
  1230. }
  1231. packet->referenceCount = 0;
  1232. packet->flags = flags;
  1233. packet->dataLength = dataLength - dataOffset;
  1234. packet->freeCallback = NULL;
  1235. return packet;
  1236. }
  1237. void enet_packet_destroy(ENetPacket* packet) {
  1238. if (packet == NULL)
  1239. return;
  1240. if (packet->freeCallback != NULL)
  1241. (*packet->freeCallback)((void*)packet);
  1242. enet_free(packet);
  1243. }
  1244. /*
  1245. =======================================================================
  1246. Protocol
  1247. =======================================================================
  1248. */
  1249. static size_t commandSizes[ENET_PROTOCOL_COMMAND_COUNT] = {
  1250. 0,
  1251. sizeof(ENetProtocolAcknowledge),
  1252. sizeof(ENetProtocolConnect),
  1253. sizeof(ENetProtocolVerifyConnect),
  1254. sizeof(ENetProtocolDisconnect),
  1255. sizeof(ENetProtocolPing),
  1256. sizeof(ENetProtocolSendReliable),
  1257. sizeof(ENetProtocolSendUnreliable),
  1258. sizeof(ENetProtocolSendFragment),
  1259. sizeof(ENetProtocolSendUnsequenced),
  1260. sizeof(ENetProtocolBandwidthLimit),
  1261. sizeof(ENetProtocolThrottleConfigure),
  1262. sizeof(ENetProtocolSendFragment)
  1263. };
  1264. size_t enet_protocol_command_size(enet_uint8 commandNumber) {
  1265. return commandSizes[commandNumber & ENET_PROTOCOL_COMMAND_MASK];
  1266. }
  1267. static void enet_protocol_change_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1268. if (state == ENET_PEER_STATE_CONNECTED || state == ENET_PEER_STATE_DISCONNECT_LATER)
  1269. enet_peer_on_connect(peer);
  1270. else
  1271. enet_peer_on_disconnect(peer);
  1272. peer->state = state;
  1273. }
  1274. static void enet_protocol_dispatch_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) {
  1275. enet_protocol_change_state(host, peer, state);
  1276. if (!peer->needsDispatch) {
  1277. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1278. peer->needsDispatch = 1;
  1279. }
  1280. }
  1281. static int enet_protocol_dispatch_incoming_commands(ENetHost* host, ENetEvent* event) {
  1282. while (!enet_list_empty(&host->dispatchQueue)) {
  1283. ENetPeer* peer = (ENetPeer*)enet_list_remove(enet_list_begin(&host->dispatchQueue));
  1284. peer->needsDispatch = 0;
  1285. switch (peer->state) {
  1286. case ENET_PEER_STATE_CONNECTION_PENDING:
  1287. case ENET_PEER_STATE_CONNECTION_SUCCEEDED:
  1288. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1289. event->type = ENET_EVENT_TYPE_CONNECT;
  1290. event->peer = peer;
  1291. event->data = peer->eventData;
  1292. return 1;
  1293. case ENET_PEER_STATE_ZOMBIE:
  1294. host->recalculateBandwidthLimits = 1;
  1295. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1296. event->peer = peer;
  1297. event->data = peer->eventData;
  1298. enet_peer_reset(peer);
  1299. return 1;
  1300. case ENET_PEER_STATE_CONNECTED:
  1301. if (enet_list_empty(&peer->dispatchedCommands))
  1302. continue;
  1303. event->packet = enet_peer_receive(peer, &event->channelID);
  1304. if (event->packet == NULL)
  1305. continue;
  1306. event->type = ENET_EVENT_TYPE_RECEIVE;
  1307. event->peer = peer;
  1308. if (!enet_list_empty(&peer->dispatchedCommands)) {
  1309. peer->needsDispatch = 1;
  1310. enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
  1311. }
  1312. return 1;
  1313. default:
  1314. break;
  1315. }
  1316. }
  1317. return 0;
  1318. }
  1319. static void enet_protocol_notify_connect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1320. host->recalculateBandwidthLimits = 1;
  1321. if (event != NULL) {
  1322. enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
  1323. peer->totalDataSent = 0;
  1324. peer->totalDataReceived = 0;
  1325. peer->totalPacketsSent = 0;
  1326. peer->totalPacketsLost = 0;
  1327. event->type = ENET_EVENT_TYPE_CONNECT;
  1328. event->peer = peer;
  1329. event->data = peer->eventData;
  1330. }
  1331. else {
  1332. enet_protocol_dispatch_state(host, peer, peer->state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING);
  1333. }
  1334. }
  1335. static void enet_protocol_notify_disconnect(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1336. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1337. host->recalculateBandwidthLimits = 1;
  1338. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1339. enet_peer_reset(peer);
  1340. }
  1341. else if (event != NULL) {
  1342. event->type = ENET_EVENT_TYPE_DISCONNECT;
  1343. event->peer = peer;
  1344. event->data = 0;
  1345. enet_peer_reset(peer);
  1346. }
  1347. else {
  1348. peer->eventData = 0;
  1349. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1350. }
  1351. }
  1352. static void enet_protocol_notify_disconnect_timeout(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  1353. if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING)
  1354. host->recalculateBandwidthLimits = 1;
  1355. if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) {
  1356. enet_peer_reset(peer);
  1357. }
  1358. else if (event != NULL) {
  1359. event->type = ENET_EVENT_TYPE_DISCONNECT_TIMEOUT;
  1360. event->peer = peer;
  1361. event->data = 0;
  1362. enet_peer_reset(peer);
  1363. }
  1364. else {
  1365. peer->eventData = 0;
  1366. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1367. }
  1368. }
  1369. static void enet_protocol_remove_sent_unreliable_commands(ENetPeer* peer) {
  1370. ENetOutgoingCommand* outgoingCommand;
  1371. if (enet_list_empty(&peer->sentUnreliableCommands))
  1372. return;
  1373. do {
  1374. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentUnreliableCommands);
  1375. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1376. if (outgoingCommand->packet != NULL) {
  1377. --outgoingCommand->packet->referenceCount;
  1378. if (outgoingCommand->packet->referenceCount == 0) {
  1379. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1380. enet_packet_destroy(outgoingCommand->packet);
  1381. }
  1382. }
  1383. enet_free(outgoingCommand);
  1384. }
  1385. while (!enet_list_empty(&peer->sentUnreliableCommands));
  1386. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1387. enet_peer_disconnect(peer, peer->eventData);
  1388. }
  1389. static ENetProtocolCommand enet_protocol_remove_sent_reliable_command(ENetPeer* peer, enet_uint16 reliableSequenceNumber, enet_uint8 channelID) {
  1390. ENetOutgoingCommand* outgoingCommand = NULL;
  1391. ENetListIterator currentCommand;
  1392. ENetProtocolCommand commandNumber;
  1393. int wasSent = 1;
  1394. for (currentCommand = enet_list_begin(&peer->sentReliableCommands); currentCommand != enet_list_end(&peer->sentReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1395. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1396. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1397. break;
  1398. }
  1399. if (currentCommand == enet_list_end(&peer->sentReliableCommands)) {
  1400. for (currentCommand = enet_list_begin(&peer->outgoingReliableCommands); currentCommand != enet_list_end(&peer->outgoingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  1401. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  1402. if (outgoingCommand->sendAttempts < 1)
  1403. return ENET_PROTOCOL_COMMAND_NONE;
  1404. if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID)
  1405. break;
  1406. }
  1407. if (currentCommand == enet_list_end(&peer->outgoingReliableCommands))
  1408. return ENET_PROTOCOL_COMMAND_NONE;
  1409. wasSent = 0;
  1410. }
  1411. if (outgoingCommand == NULL)
  1412. return ENET_PROTOCOL_COMMAND_NONE;
  1413. if (channelID < peer->channelCount) {
  1414. ENetChannel* channel = &peer->channels[channelID];
  1415. enet_uint16 reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1416. if (channel->reliableWindows[reliableWindow] > 0) {
  1417. --channel->reliableWindows[reliableWindow];
  1418. if (!channel->reliableWindows[reliableWindow])
  1419. channel->usedReliableWindows &= ~(1 << reliableWindow);
  1420. }
  1421. }
  1422. commandNumber = (ENetProtocolCommand)(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK);
  1423. enet_list_remove(&outgoingCommand->outgoingCommandList);
  1424. if (outgoingCommand->packet != NULL) {
  1425. if (wasSent)
  1426. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  1427. --outgoingCommand->packet->referenceCount;
  1428. if (outgoingCommand->packet->referenceCount == 0) {
  1429. outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
  1430. enet_packet_destroy(outgoingCommand->packet);
  1431. }
  1432. }
  1433. enet_free(outgoingCommand);
  1434. if (enet_list_empty(&peer->sentReliableCommands))
  1435. return commandNumber;
  1436. outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentReliableCommands);
  1437. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  1438. return commandNumber;
  1439. }
  1440. static ENetPeer* enet_protocol_handle_connect(ENetHost* host, ENetProtocolHeader* header, ENetProtocol* command) {
  1441. enet_uint8 incomingSessionID, outgoingSessionID;
  1442. enet_uint32 mtu, windowSize;
  1443. ENetChannel* channel;
  1444. size_t channelCount, duplicatePeers = 0;
  1445. ENetPeer* currentPeer, * peer = NULL;
  1446. ENetProtocol verifyCommand;
  1447. channelCount = ENET_NET_TO_HOST_32(command->connect.channelCount);
  1448. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  1449. return NULL;
  1450. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  1451. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED) {
  1452. if (peer == NULL)
  1453. peer = currentPeer;
  1454. }
  1455. else if (currentPeer->state != ENET_PEER_STATE_CONNECTING && in6_equal(currentPeer->address.ipv6, host->receivedAddress.ipv6)) {
  1456. if (currentPeer->address.port == host->receivedAddress.port && currentPeer->connectID == command->connect.connectID)
  1457. return NULL;
  1458. ++duplicatePeers;
  1459. }
  1460. }
  1461. if (peer == NULL || duplicatePeers >= host->duplicatePeers)
  1462. return NULL;
  1463. if (channelCount > host->channelLimit)
  1464. channelCount = host->channelLimit;
  1465. peer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  1466. if (peer->channels == NULL)
  1467. return NULL;
  1468. peer->channelCount = channelCount;
  1469. peer->state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
  1470. peer->connectID = command->connect.connectID;
  1471. peer->address = host->receivedAddress;
  1472. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->connect.outgoingPeerID);
  1473. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->connect.incomingBandwidth);
  1474. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->connect.outgoingBandwidth);
  1475. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->connect.packetThrottleInterval);
  1476. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleAcceleration);
  1477. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleDeceleration);
  1478. peer->eventData = ENET_NET_TO_HOST_32(command->connect.data);
  1479. incomingSessionID = command->connect.incomingSessionID == 0xFF ? peer->outgoingSessionID : command->connect.incomingSessionID;
  1480. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1481. if (incomingSessionID == peer->outgoingSessionID)
  1482. incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1483. peer->outgoingSessionID = incomingSessionID;
  1484. outgoingSessionID = command->connect.outgoingSessionID == 0xFF ? peer->incomingSessionID : command->connect.outgoingSessionID;
  1485. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1486. if (outgoingSessionID == peer->incomingSessionID)
  1487. outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
  1488. peer->incomingSessionID = outgoingSessionID;
  1489. for (channel = peer->channels; channel < &peer->channels[channelCount]; ++channel) {
  1490. channel->outgoingReliableSequenceNumber = 0;
  1491. channel->outgoingUnreliableSequenceNumber = 0;
  1492. channel->incomingReliableSequenceNumber = 0;
  1493. channel->incomingUnreliableSequenceNumber = 0;
  1494. enet_list_clear(&channel->incomingReliableCommands);
  1495. enet_list_clear(&channel->incomingUnreliableCommands);
  1496. channel->usedReliableWindows = 0;
  1497. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  1498. }
  1499. mtu = ENET_NET_TO_HOST_32(command->connect.mtu);
  1500. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1501. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1502. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1503. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1504. peer->mtu = mtu;
  1505. if (host->outgoingBandwidth == 0 && peer->incomingBandwidth == 0)
  1506. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1507. else if (host->outgoingBandwidth == 0 || peer->incomingBandwidth == 0)
  1508. peer->windowSize = (ENET_MAX(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1509. else
  1510. peer->windowSize = (ENET_MIN(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1511. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1512. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1513. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1514. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1515. if (host->incomingBandwidth == 0)
  1516. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1517. else
  1518. windowSize = (host->incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1519. if (windowSize > ENET_NET_TO_HOST_32(command->connect.windowSize))
  1520. windowSize = ENET_NET_TO_HOST_32(command->connect.windowSize);
  1521. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1522. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1523. else if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1524. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1525. verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  1526. verifyCommand.header.channelID = 0xFF;
  1527. verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16(peer->incomingPeerID);
  1528. verifyCommand.verifyConnect.incomingSessionID = incomingSessionID;
  1529. verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID;
  1530. verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_32(peer->mtu);
  1531. verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32(windowSize);
  1532. verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  1533. verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  1534. verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  1535. verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32(peer->packetThrottleInterval);
  1536. verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(peer->packetThrottleAcceleration);
  1537. verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(peer->packetThrottleDeceleration);
  1538. verifyCommand.verifyConnect.connectID = peer->connectID;
  1539. enet_peer_queue_outgoing_command(peer, &verifyCommand, NULL, 0, 0);
  1540. return peer;
  1541. }
  1542. static int enet_protocol_handle_send_reliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1543. size_t dataLength;
  1544. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1545. 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");
  1546. return ENET_PROTOCOL_SEND_FAIL;
  1547. }
  1548. dataLength = ENET_NET_TO_HOST_16(command->sendReliable.dataLength);
  1549. *currentData += dataLength;
  1550. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > & host->receivedData[host->receivedDataLength]) {
  1551. ENET_LOG_ERROR("data length is wacko");
  1552. return ENET_PACKET_DATA_LENGTH_WEIRDNESS;
  1553. }
  1554. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendReliable), dataLength, ENET_PACKET_FLAG_RELIABLE, 0) == NULL) {
  1555. ENET_LOG_ERROR("Could not queue incoming command, it returned NULL");
  1556. return ENET_PEER_QUEUE_INCOMING_FAILURE;
  1557. }
  1558. return 0;
  1559. }
  1560. static int enet_protocol_handle_send_unsequenced(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1561. enet_uint32 unsequencedGroup, index;
  1562. size_t dataLength;
  1563. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1564. 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");
  1565. return ENET_PROTOCOL_SEND_FAIL;
  1566. }
  1567. dataLength = ENET_NET_TO_HOST_16(command->sendUnsequenced.dataLength);
  1568. *currentData += dataLength;
  1569. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > & host->receivedData[host->receivedDataLength]) {
  1570. ENET_LOG_ERROR("data length is wacko");
  1571. return ENET_PACKET_DATA_LENGTH_WEIRDNESS;
  1572. }
  1573. unsequencedGroup = ENET_NET_TO_HOST_16(command->sendUnsequenced.unsequencedGroup);
  1574. index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
  1575. if (unsequencedGroup < peer->incomingUnsequencedGroup)
  1576. unsequencedGroup += 0x10000;
  1577. if (unsequencedGroup >= (enet_uint32)peer->incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE)
  1578. return 0;
  1579. unsequencedGroup &= 0xFFFF;
  1580. if (unsequencedGroup - index != peer->incomingUnsequencedGroup) {
  1581. peer->incomingUnsequencedGroup = unsequencedGroup - index;
  1582. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  1583. }
  1584. else if (peer->unsequencedWindow[index / 32] & (1 << (index % 32))) {
  1585. return 0;
  1586. }
  1587. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnsequenced), dataLength, ENET_PACKET_FLAG_UNSEQUENCED, 0) == NULL) {
  1588. ENET_LOG_ERROR("Could not queue incoming command, it returned NULL");
  1589. return ENET_PEER_QUEUE_INCOMING_FAILURE;
  1590. }
  1591. peer->unsequencedWindow[index / 32] |= 1 << (index % 32);
  1592. return 0;
  1593. }
  1594. static int enet_protocol_handle_send_unreliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1595. size_t dataLength;
  1596. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1597. 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");
  1598. return ENET_PROTOCOL_SEND_FAIL;
  1599. }
  1600. dataLength = ENET_NET_TO_HOST_16(command->sendUnreliable.dataLength);
  1601. *currentData += dataLength;
  1602. if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > & host->receivedData[host->receivedDataLength]) {
  1603. ENET_LOG_ERROR("data length is wacko");
  1604. return ENET_PACKET_DATA_LENGTH_WEIRDNESS;
  1605. }
  1606. if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnreliable), dataLength, 0, 0) == NULL) {
  1607. ENET_LOG_ERROR("Could not queue incoming command, it returned NULL");
  1608. return ENET_PEER_QUEUE_INCOMING_FAILURE;
  1609. }
  1610. return 0;
  1611. }
  1612. static int enet_protocol_handle_send_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1613. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, startSequenceNumber, totalLength;
  1614. ENetChannel* channel;
  1615. enet_uint16 startWindow, currentWindow;
  1616. ENetListIterator currentCommand;
  1617. ENetIncomingCommand* startCommand = NULL;
  1618. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1619. 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");
  1620. return ENET_PROTOCOL_SEND_FAIL;
  1621. }
  1622. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1623. *currentData += fragmentLength;
  1624. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > & host->receivedData[host->receivedDataLength]) {
  1625. ENET_LOG_ERROR("data length is wacko");
  1626. return ENET_PACKET_DATA_LENGTH_WEIRDNESS;
  1627. }
  1628. channel = &peer->channels[command->header.channelID];
  1629. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1630. startWindow = startSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1631. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1632. if (startSequenceNumber < channel->incomingReliableSequenceNumber)
  1633. startWindow += ENET_PEER_RELIABLE_WINDOWS;
  1634. if (startWindow < currentWindow || startWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1635. return 0;
  1636. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1637. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1638. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1639. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1640. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset) {
  1641. ENET_LOG_ERROR("Some fragment weirdness going on here");
  1642. return ENET_PACKET_DATA_FRAGMENT_WEIRDNESS;
  1643. }
  1644. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1645. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1646. if (startSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1647. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1648. continue;
  1649. }
  1650. else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1651. break;
  1652. }
  1653. if (incomingCommand->reliableSequenceNumber <= startSequenceNumber) {
  1654. if (incomingCommand->reliableSequenceNumber < startSequenceNumber)
  1655. break;
  1656. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount) {
  1657. ENET_LOG_ERROR("Some fragment weirdness going on here");
  1658. return ENET_PACKET_DATA_FRAGMENT_WEIRDNESS;
  1659. }
  1660. startCommand = incomingCommand;
  1661. break;
  1662. }
  1663. }
  1664. if (startCommand == NULL) {
  1665. ENetProtocol hostCommand = *command;
  1666. hostCommand.header.reliableSequenceNumber = startSequenceNumber;
  1667. startCommand = enet_peer_queue_incoming_command(peer, &hostCommand, NULL, totalLength, ENET_PACKET_FLAG_RELIABLE, fragmentCount);
  1668. if (startCommand == NULL) {
  1669. ENET_LOG_ERROR("startCommand was NULL.");
  1670. return ENET_PACKET_STARTCMD_NULL;
  1671. }
  1672. }
  1673. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1674. --startCommand->fragmentsRemaining;
  1675. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1676. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1677. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1678. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1679. if (startCommand->fragmentsRemaining <= 0)
  1680. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  1681. }
  1682. return 0;
  1683. }
  1684. static int enet_protocol_handle_send_unreliable_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) {
  1685. enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, reliableSequenceNumber, startSequenceNumber, totalLength;
  1686. enet_uint16 reliableWindow, currentWindow;
  1687. ENetChannel* channel;
  1688. ENetListIterator currentCommand;
  1689. ENetIncomingCommand* startCommand = NULL;
  1690. if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) {
  1691. 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");
  1692. return ENET_PROTOCOL_SEND_FAIL;
  1693. }
  1694. fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength);
  1695. *currentData += fragmentLength;
  1696. if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > & host->receivedData[host->receivedDataLength]) {
  1697. ENET_LOG_ERROR("fragment data length is wacko");
  1698. return ENET_PACKET_DATA_LENGTH_WEIRDNESS;
  1699. }
  1700. channel = &peer->channels[command->header.channelID];
  1701. reliableSequenceNumber = command->header.reliableSequenceNumber;
  1702. startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber);
  1703. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1704. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  1705. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1706. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  1707. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  1708. return 0;
  1709. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && startSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  1710. return 0;
  1711. fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber);
  1712. fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount);
  1713. fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset);
  1714. totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength);
  1715. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset) {
  1716. 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");
  1717. return ENET_PEER_SENDFAIL_FRAGMENTOVERLOAD;
  1718. }
  1719. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  1720. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  1721. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1722. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  1723. continue;
  1724. }
  1725. else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  1726. break;
  1727. }
  1728. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  1729. break;
  1730. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  1731. continue;
  1732. if (incomingCommand->unreliableSequenceNumber <= startSequenceNumber) {
  1733. if (incomingCommand->unreliableSequenceNumber < startSequenceNumber)
  1734. break;
  1735. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount) {
  1736. ENET_LOG_ERROR("Some fragment weirdness going on here");
  1737. return ENET_PACKET_DATA_FRAGMENT_WEIRDNESS;
  1738. }
  1739. startCommand = incomingCommand;
  1740. break;
  1741. }
  1742. }
  1743. if (startCommand == NULL) {
  1744. startCommand = enet_peer_queue_incoming_command(peer, command, NULL, totalLength,
  1745. ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED, fragmentCount);
  1746. if (startCommand == NULL) {
  1747. ENET_LOG_ERROR("startCommand was NULL");
  1748. return ENET_PACKET_STARTCMD_NULL;
  1749. }
  1750. }
  1751. if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) {
  1752. --startCommand->fragmentsRemaining;
  1753. startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
  1754. if (fragmentOffset + fragmentLength > startCommand->packet->dataLength)
  1755. fragmentLength = startCommand->packet->dataLength - fragmentOffset;
  1756. memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength);
  1757. if (startCommand->fragmentsRemaining <= 0)
  1758. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  1759. }
  1760. return 0;
  1761. }
  1762. static int enet_protocol_handle_ping(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1763. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1764. ENET_LOG_ERROR("Doing jack squat on a peer that is not connected correctly");
  1765. return ENET_PEER_NOT_CONNECTED_CORRECTLY;
  1766. }
  1767. return 0;
  1768. }
  1769. static int enet_protocol_handle_bandwidth_limit(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1770. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1771. ENET_LOG_ERROR("Doing jack squat on a peer that is not connected correctly");
  1772. return ENET_PEER_NOT_CONNECTED_CORRECTLY;
  1773. }
  1774. if (peer->incomingBandwidth != 0)
  1775. --host->bandwidthLimitedPeers;
  1776. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.incomingBandwidth);
  1777. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.outgoingBandwidth);
  1778. if (peer->incomingBandwidth != 0)
  1779. ++host->bandwidthLimitedPeers;
  1780. if (peer->incomingBandwidth == 0 && host->outgoingBandwidth == 0)
  1781. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1782. else if (peer->incomingBandwidth == 0 || host->outgoingBandwidth == 0)
  1783. peer->windowSize = (ENET_MAX(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1784. else
  1785. peer->windowSize = (ENET_MIN(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1786. if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1787. peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1788. else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1789. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1790. return 0;
  1791. }
  1792. static int enet_protocol_handle_throttle_configure(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1793. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1794. ENET_LOG_ERROR("Doing jack squat on a peer that is not connected correctly");
  1795. return ENET_PEER_NOT_CONNECTED_CORRECTLY;
  1796. }
  1797. peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleInterval);
  1798. peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleAcceleration);
  1799. peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleDeceleration);
  1800. return 0;
  1801. }
  1802. static int enet_protocol_handle_disconnect(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) {
  1803. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT)
  1804. return 0;
  1805. enet_peer_reset_queues(peer);
  1806. if (peer->state == ENET_PEER_STATE_CONNECTION_SUCCEEDED || peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_CONNECTING) {
  1807. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1808. }
  1809. else if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  1810. if (peer->state == ENET_PEER_STATE_CONNECTION_PENDING)
  1811. host->recalculateBandwidthLimits = 1;
  1812. enet_peer_reset(peer);
  1813. }
  1814. else if (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  1815. enet_protocol_change_state(host, peer, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT);
  1816. }
  1817. else {
  1818. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1819. }
  1820. if (peer->state != ENET_PEER_STATE_DISCONNECTED)
  1821. peer->eventData = ENET_NET_TO_HOST_32(command->disconnect.data);
  1822. return 0;
  1823. }
  1824. static int enet_protocol_handle_acknowledge(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1825. enet_uint32 roundTripTime, receivedSentTime, receivedReliableSequenceNumber;
  1826. ENetProtocolCommand commandNumber;
  1827. if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE)
  1828. return 0;
  1829. receivedSentTime = ENET_NET_TO_HOST_16(command->acknowledge.receivedSentTime);
  1830. receivedSentTime |= host->serviceTime & 0xFFFF0000;
  1831. if ((receivedSentTime & 0x8000) > (host->serviceTime & 0x8000))
  1832. receivedSentTime -= 0x10000;
  1833. if (ENET_TIME_LESS(host->serviceTime, receivedSentTime))
  1834. return 0;
  1835. peer->lastReceiveTime = host->serviceTime;
  1836. peer->earliestTimeout = 0;
  1837. roundTripTime = ENET_TIME_DIFFERENCE(host->serviceTime, receivedSentTime);
  1838. if (roundTripTime == 0)
  1839. roundTripTime = 1;
  1840. if (peer->smoothedRoundTripTime == 0)
  1841. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * ENET_SRTT_INITIAL + ENET_SRTT_PARA_G * roundTripTime);
  1842. else
  1843. peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * peer->smoothedRoundTripTime + ENET_SRTT_PARA_G * roundTripTime);
  1844. enet_peer_throttle(peer, peer->smoothedRoundTripTime);
  1845. peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4;
  1846. if (peer->smoothedRoundTripTime >= peer->roundTripTime) {
  1847. peer->roundTripTime += (peer->smoothedRoundTripTime - peer->roundTripTime) / 8;
  1848. peer->roundTripTimeVariance += (peer->smoothedRoundTripTime - peer->roundTripTime) / 4;
  1849. }
  1850. else {
  1851. peer->roundTripTime -= (peer->roundTripTime - peer->smoothedRoundTripTime) / 8;
  1852. peer->roundTripTimeVariance += (peer->roundTripTime - peer->smoothedRoundTripTime) / 4;
  1853. }
  1854. if (peer->roundTripTime < peer->lowestRoundTripTime)
  1855. peer->lowestRoundTripTime = peer->roundTripTime;
  1856. if (peer->roundTripTimeVariance > peer->highestRoundTripTimeVariance)
  1857. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1858. if (peer->packetThrottleEpoch == 0 || ENET_TIME_DIFFERENCE(host->serviceTime, peer->packetThrottleEpoch) >= peer->packetThrottleInterval) {
  1859. peer->lastRoundTripTime = peer->lowestRoundTripTime;
  1860. peer->lastRoundTripTimeVariance = peer->highestRoundTripTimeVariance;
  1861. peer->lowestRoundTripTime = peer->roundTripTime;
  1862. peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance;
  1863. peer->packetThrottleEpoch = host->serviceTime;
  1864. }
  1865. receivedReliableSequenceNumber = ENET_NET_TO_HOST_16(command->acknowledge.receivedReliableSequenceNumber);
  1866. commandNumber = enet_protocol_remove_sent_reliable_command(peer, receivedReliableSequenceNumber, command->header.channelID);
  1867. switch (peer->state) {
  1868. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  1869. if (commandNumber != ENET_PROTOCOL_COMMAND_VERIFY_CONNECT) {
  1870. ENET_LOG_ERROR("Wrong command number. Got %u vs %u", commandNumber, ENET_PROTOCOL_COMMAND_VERIFY_CONNECT);
  1871. return ENET_PEER_BAD_COMMAND_NUMBER;
  1872. }
  1873. enet_protocol_notify_connect(host, peer, event);
  1874. break;
  1875. case ENET_PEER_STATE_DISCONNECTING:
  1876. if (commandNumber != ENET_PROTOCOL_COMMAND_DISCONNECT) {
  1877. ENET_LOG_ERROR("Wrong command number. Got %u vs %u", commandNumber, ENET_PROTOCOL_COMMAND_DISCONNECT);
  1878. return ENET_PEER_BAD_COMMAND_NUMBER;
  1879. }
  1880. enet_protocol_notify_disconnect(host, peer, event);
  1881. break;
  1882. case ENET_PEER_STATE_DISCONNECT_LATER:
  1883. if (enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))
  1884. enet_peer_disconnect(peer, peer->eventData);
  1885. break;
  1886. default:
  1887. break;
  1888. }
  1889. return 0;
  1890. }
  1891. static int enet_protocol_handle_verify_connect(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) {
  1892. enet_uint32 mtu, windowSize;
  1893. size_t channelCount;
  1894. if (peer->state != ENET_PEER_STATE_CONNECTING)
  1895. return 0;
  1896. channelCount = ENET_NET_TO_HOST_32(command->verifyConnect.channelCount);
  1897. 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) {
  1898. peer->eventData = 0;
  1899. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  1900. ENET_LOG_ERROR("A peer has entered a Zombie state...");
  1901. return ENET_PEER_BECAME_ZOMBIE;
  1902. }
  1903. enet_protocol_remove_sent_reliable_command(peer, 1, 0xFF);
  1904. if (channelCount < peer->channelCount)
  1905. peer->channelCount = channelCount;
  1906. peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->verifyConnect.outgoingPeerID);
  1907. peer->incomingSessionID = command->verifyConnect.incomingSessionID;
  1908. peer->outgoingSessionID = command->verifyConnect.outgoingSessionID;
  1909. mtu = ENET_NET_TO_HOST_32(command->verifyConnect.mtu);
  1910. if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
  1911. mtu = ENET_PROTOCOL_MINIMUM_MTU;
  1912. else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
  1913. mtu = ENET_PROTOCOL_MAXIMUM_MTU;
  1914. if (mtu < peer->mtu)
  1915. peer->mtu = mtu;
  1916. windowSize = ENET_NET_TO_HOST_32(command->verifyConnect.windowSize);
  1917. if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  1918. windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  1919. if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  1920. windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  1921. if (windowSize < peer->windowSize)
  1922. peer->windowSize = windowSize;
  1923. peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.incomingBandwidth);
  1924. peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.outgoingBandwidth);
  1925. enet_protocol_notify_connect(host, peer, event);
  1926. return 0;
  1927. }
  1928. static int enet_protocol_handle_incoming_commands(ENetHost* host, ENetEvent* event) {
  1929. ENetProtocolHeader* header;
  1930. ENetProtocol* command;
  1931. ENetPeer* peer;
  1932. enet_uint8* currentData;
  1933. size_t headerSize;
  1934. enet_uint16 peerID, flags;
  1935. enet_uint8 sessionID;
  1936. if (host->receivedDataLength < (size_t) & ((ENetProtocolHeader*)0)->sentTime)
  1937. return 0;
  1938. header = (ENetProtocolHeader*)host->receivedData;
  1939. peerID = ENET_NET_TO_HOST_16(header->peerID);
  1940. sessionID = (peerID & ENET_PROTOCOL_HEADER_SESSION_MASK) >> ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  1941. flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK;
  1942. peerID &= ~(ENET_PROTOCOL_HEADER_FLAG_MASK | ENET_PROTOCOL_HEADER_SESSION_MASK);
  1943. headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof(ENetProtocolHeader) : (size_t) & ((ENetProtocolHeader*)0)->sentTime);
  1944. if (host->checksumCallback != NULL)
  1945. headerSize += sizeof(enet_uint32);
  1946. if (peerID == ENET_PROTOCOL_MAXIMUM_PEER_ID) {
  1947. peer = NULL;
  1948. }
  1949. else if (peerID >= host->peerCount) {
  1950. return 0;
  1951. }
  1952. else {
  1953. peer = &host->peers[peerID];
  1954. 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))
  1955. return 0;
  1956. }
  1957. if (host->checksumCallback != NULL) {
  1958. enet_uint32* checksum = (enet_uint32*)& host->receivedData[headerSize - sizeof(enet_uint32)];
  1959. enet_uint32 desiredChecksum = *checksum;
  1960. ENetBuffer buffer;
  1961. *checksum = peer != NULL ? peer->connectID : 0;
  1962. buffer.data = host->receivedData;
  1963. buffer.dataLength = host->receivedDataLength;
  1964. if (host->checksumCallback(&buffer, 1) != desiredChecksum)
  1965. return 0;
  1966. }
  1967. if (peer != NULL) {
  1968. peer->address.ipv6 = host->receivedAddress.ipv6;
  1969. peer->address.port = host->receivedAddress.port;
  1970. peer->incomingDataTotal += host->receivedDataLength;
  1971. peer->totalDataReceived += host->receivedDataLength;
  1972. }
  1973. currentData = host->receivedData + headerSize;
  1974. while (currentData < &host->receivedData[host->receivedDataLength]) {
  1975. enet_uint8 commandNumber;
  1976. size_t commandSize;
  1977. command = (ENetProtocol*)currentData;
  1978. if (currentData + sizeof(ENetProtocolCommandHeader) > & host->receivedData[host->receivedDataLength])
  1979. break;
  1980. commandNumber = command->header.command & ENET_PROTOCOL_COMMAND_MASK;
  1981. if (commandNumber >= ENET_PROTOCOL_COMMAND_COUNT)
  1982. break;
  1983. commandSize = commandSizes[commandNumber];
  1984. if (commandSize == 0 || currentData + commandSize > & host->receivedData[host->receivedDataLength])
  1985. break;
  1986. currentData += commandSize;
  1987. if (peer == NULL && (commandNumber != ENET_PROTOCOL_COMMAND_CONNECT || currentData < &host->receivedData[host->receivedDataLength]))
  1988. break;
  1989. command->header.reliableSequenceNumber = ENET_NET_TO_HOST_16(command->header.reliableSequenceNumber);
  1990. switch (commandNumber) {
  1991. case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE:
  1992. if (enet_protocol_handle_acknowledge(host, event, peer, command))
  1993. goto commandError;
  1994. break;
  1995. case ENET_PROTOCOL_COMMAND_CONNECT:
  1996. if (peer != NULL)
  1997. goto commandError;
  1998. if (host->preventConnections == 0) {
  1999. peer = enet_protocol_handle_connect(host, header, command);
  2000. if (peer == NULL)
  2001. goto commandError;
  2002. }
  2003. break;
  2004. case ENET_PROTOCOL_COMMAND_VERIFY_CONNECT:
  2005. if (enet_protocol_handle_verify_connect(host, event, peer, command))
  2006. goto commandError;
  2007. break;
  2008. case ENET_PROTOCOL_COMMAND_DISCONNECT:
  2009. if (enet_protocol_handle_disconnect(host, peer, command))
  2010. goto commandError;
  2011. break;
  2012. case ENET_PROTOCOL_COMMAND_PING:
  2013. if (enet_protocol_handle_ping(host, peer, command))
  2014. goto commandError;
  2015. break;
  2016. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2017. if (enet_protocol_handle_send_reliable(host, peer, command, &currentData))
  2018. goto commandError;
  2019. break;
  2020. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2021. if (enet_protocol_handle_send_unreliable(host, peer, command, &currentData))
  2022. goto commandError;
  2023. break;
  2024. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2025. if (enet_protocol_handle_send_unsequenced(host, peer, command, &currentData))
  2026. goto commandError;
  2027. break;
  2028. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2029. if (enet_protocol_handle_send_fragment(host, peer, command, &currentData))
  2030. goto commandError;
  2031. break;
  2032. case ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT:
  2033. if (enet_protocol_handle_bandwidth_limit(host, peer, command))
  2034. goto commandError;
  2035. break;
  2036. case ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE:
  2037. if (enet_protocol_handle_throttle_configure(host, peer, command))
  2038. goto commandError;
  2039. break;
  2040. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  2041. if (enet_protocol_handle_send_unreliable_fragment(host, peer, command, &currentData))
  2042. goto commandError;
  2043. break;
  2044. default:
  2045. goto commandError;
  2046. }
  2047. if (peer != NULL && (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0) {
  2048. enet_uint16 sentTime;
  2049. if (!(flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME))
  2050. break;
  2051. sentTime = ENET_NET_TO_HOST_16(header->sentTime);
  2052. switch (peer->state) {
  2053. case ENET_PEER_STATE_DISCONNECTING:
  2054. case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
  2055. case ENET_PEER_STATE_DISCONNECTED:
  2056. case ENET_PEER_STATE_ZOMBIE:
  2057. break;
  2058. case ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT:
  2059. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2060. enet_peer_queue_acknowledgement(peer, command, sentTime);
  2061. break;
  2062. default:
  2063. enet_peer_queue_acknowledgement(peer, command, sentTime);
  2064. break;
  2065. }
  2066. }
  2067. }
  2068. commandError:
  2069. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2070. return 1;
  2071. return 0;
  2072. }
  2073. static int enet_protocol_receive_incoming_commands(ENetHost* host, ENetEvent* event) {
  2074. int packets;
  2075. for (packets = 0; packets < 256; ++packets) {
  2076. int receivedLength;
  2077. ENetBuffer buffer;
  2078. buffer.data = host->packetData[0];
  2079. buffer.dataLength = host->mtu;
  2080. receivedLength = enet_socket_receive(host->socket, &host->receivedAddress, &buffer, 1);
  2081. if (receivedLength == -2)
  2082. continue;
  2083. if (receivedLength < 0) {
  2084. ENET_LOG_ERROR("received length was negative: %i", receivedLength);
  2085. return ENET_PACKET_DATA_LENGTH_NEGATIVE;
  2086. }
  2087. if (receivedLength == 0)
  2088. return 0;
  2089. host->receivedData = host->packetData[0];
  2090. host->receivedDataLength = receivedLength;
  2091. host->totalReceivedData += receivedLength;
  2092. host->totalReceivedPackets++;
  2093. if (host->interceptCallback != NULL) {
  2094. switch (host->interceptCallback(host, (void*)event)) {
  2095. case 1:
  2096. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2097. return 1;
  2098. continue;
  2099. case -1:
  2100. ENET_LOG_ERROR("intercept callback failure");
  2101. return ENET_HOST_INTERCEPT_FAILURE;
  2102. default:
  2103. break;
  2104. }
  2105. }
  2106. switch (enet_protocol_handle_incoming_commands(host, event)) {
  2107. case 1:
  2108. return 1;
  2109. case -1:
  2110. ENET_LOG_ERROR("enet_protocol_handle_incoming_commands failure");
  2111. return ENET_PEER_QUEUE_INCOMING_FAILURE;
  2112. default:
  2113. break;
  2114. }
  2115. }
  2116. return -1;
  2117. }
  2118. static void enet_protocol_send_acknowledgements(ENetHost* host, ENetPeer* peer) {
  2119. ENetProtocol* command = &host->commands[host->commandCount];
  2120. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2121. ENetAcknowledgement* acknowledgement;
  2122. ENetListIterator currentAcknowledgement;
  2123. enet_uint16 reliableSequenceNumber;
  2124. currentAcknowledgement = enet_list_begin(&peer->acknowledgements);
  2125. while (currentAcknowledgement != enet_list_end(&peer->acknowledgements)) {
  2126. if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < sizeof(ENetProtocolAcknowledge)) {
  2127. host->continueSending = 1;
  2128. break;
  2129. }
  2130. acknowledgement = (ENetAcknowledgement*)currentAcknowledgement;
  2131. currentAcknowledgement = enet_list_next(currentAcknowledgement);
  2132. buffer->data = command;
  2133. buffer->dataLength = sizeof(ENetProtocolAcknowledge);
  2134. host->packetSize += buffer->dataLength;
  2135. reliableSequenceNumber = ENET_HOST_TO_NET_16(acknowledgement->command.header.reliableSequenceNumber);
  2136. command->header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
  2137. command->header.channelID = acknowledgement->command.header.channelID;
  2138. command->header.reliableSequenceNumber = reliableSequenceNumber;
  2139. command->acknowledge.receivedReliableSequenceNumber = reliableSequenceNumber;
  2140. command->acknowledge.receivedSentTime = ENET_HOST_TO_NET_16(acknowledgement->sentTime);
  2141. if ((acknowledgement->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
  2142. enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
  2143. enet_list_remove(&acknowledgement->acknowledgementList);
  2144. enet_free(acknowledgement);
  2145. ++command;
  2146. ++buffer;
  2147. }
  2148. host->commandCount = command - host->commands;
  2149. host->bufferCount = buffer - host->buffers;
  2150. }
  2151. static void enet_protocol_send_unreliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2152. ENetProtocol* command = &host->commands[host->commandCount];
  2153. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2154. ENetOutgoingCommand* outgoingCommand;
  2155. ENetListIterator currentCommand;
  2156. currentCommand = enet_list_begin(&peer->outgoingUnreliableCommands);
  2157. while (currentCommand != enet_list_end(&peer->outgoingUnreliableCommands)) {
  2158. size_t commandSize;
  2159. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2160. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2161. 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)) {
  2162. host->continueSending = 1;
  2163. break;
  2164. }
  2165. currentCommand = enet_list_next(currentCommand);
  2166. if (outgoingCommand->packet != NULL && outgoingCommand->fragmentOffset == 0) {
  2167. peer->packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER;
  2168. peer->packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE;
  2169. if (peer->packetThrottleCounter > peer->packetThrottle) {
  2170. enet_uint16 reliableSequenceNumber = outgoingCommand->reliableSequenceNumber;
  2171. enet_uint16 unreliableSequenceNumber = outgoingCommand->unreliableSequenceNumber;
  2172. for (;;) {
  2173. --outgoingCommand->packet->referenceCount;
  2174. if (outgoingCommand->packet->referenceCount == 0)
  2175. enet_packet_destroy(outgoingCommand->packet);
  2176. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2177. enet_free(outgoingCommand);
  2178. if (currentCommand == enet_list_end(&peer->outgoingUnreliableCommands))
  2179. break;
  2180. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2181. if (outgoingCommand->reliableSequenceNumber != reliableSequenceNumber || outgoingCommand->unreliableSequenceNumber != unreliableSequenceNumber)
  2182. break;
  2183. currentCommand = enet_list_next(currentCommand);
  2184. }
  2185. continue;
  2186. }
  2187. }
  2188. buffer->data = command;
  2189. buffer->dataLength = commandSize;
  2190. host->packetSize += buffer->dataLength;
  2191. *command = outgoingCommand->command;
  2192. enet_list_remove(&outgoingCommand->outgoingCommandList);
  2193. if (outgoingCommand->packet != NULL) {
  2194. ++buffer;
  2195. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2196. buffer->dataLength = outgoingCommand->fragmentLength;
  2197. host->packetSize += buffer->dataLength;
  2198. enet_list_insert(enet_list_end(&peer->sentUnreliableCommands), outgoingCommand);
  2199. }
  2200. else {
  2201. enet_free(outgoingCommand);
  2202. }
  2203. ++command;
  2204. ++buffer;
  2205. }
  2206. host->commandCount = command - host->commands;
  2207. host->bufferCount = buffer - host->buffers;
  2208. 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))
  2209. enet_peer_disconnect(peer, peer->eventData);
  2210. }
  2211. static int enet_protocol_check_timeouts(ENetHost* host, ENetPeer* peer, ENetEvent* event) {
  2212. ENetOutgoingCommand* outgoingCommand;
  2213. ENetListIterator currentCommand, insertPosition;
  2214. currentCommand = enet_list_begin(&peer->sentReliableCommands);
  2215. insertPosition = enet_list_begin(&peer->outgoingReliableCommands);
  2216. while (currentCommand != enet_list_end(&peer->sentReliableCommands)) {
  2217. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2218. currentCommand = enet_list_next(currentCommand);
  2219. if (ENET_TIME_DIFFERENCE(host->serviceTime, outgoingCommand->sentTime) < outgoingCommand->roundTripTimeout)
  2220. continue;
  2221. if (peer->earliestTimeout == 0 || ENET_TIME_LESS(outgoingCommand->sentTime, peer->earliestTimeout))
  2222. peer->earliestTimeout = outgoingCommand->sentTime;
  2223. 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))) {
  2224. enet_protocol_notify_disconnect_timeout(host, peer, event);
  2225. return 1;
  2226. }
  2227. if (outgoingCommand->packet != NULL)
  2228. peer->reliableDataInTransit -= outgoingCommand->fragmentLength;
  2229. ++peer->packetsLost;
  2230. ++peer->totalPacketsLost;
  2231. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2232. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2233. enet_list_insert(insertPosition, enet_list_remove(&outgoingCommand->outgoingCommandList));
  2234. if (currentCommand == enet_list_begin(&peer->sentReliableCommands) && !enet_list_empty(&peer->sentReliableCommands)) {
  2235. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2236. peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout;
  2237. }
  2238. }
  2239. return 0;
  2240. }
  2241. static int enet_protocol_send_reliable_outgoing_commands(ENetHost* host, ENetPeer* peer) {
  2242. ENetProtocol* command = &host->commands[host->commandCount];
  2243. ENetBuffer* buffer = &host->buffers[host->bufferCount];
  2244. ENetOutgoingCommand* outgoingCommand;
  2245. ENetListIterator currentCommand;
  2246. ENetChannel* channel;
  2247. enet_uint16 reliableWindow;
  2248. size_t commandSize;
  2249. int windowExceeded = 0, windowWrap = 0, canPing = 1;
  2250. currentCommand = enet_list_begin(&peer->outgoingReliableCommands);
  2251. while (currentCommand != enet_list_end(&peer->outgoingReliableCommands)) {
  2252. outgoingCommand = (ENetOutgoingCommand*)currentCommand;
  2253. channel = outgoingCommand->command.header.channelID < peer->channelCount ? &peer->channels[outgoingCommand->command.header.channelID] : NULL;
  2254. reliableWindow = outgoingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2255. if (channel != NULL) {
  2256. 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)))))
  2257. windowWrap = 1;
  2258. if (windowWrap) {
  2259. currentCommand = enet_list_next(currentCommand);
  2260. continue;
  2261. }
  2262. }
  2263. if (outgoingCommand->packet != NULL) {
  2264. if (!windowExceeded) {
  2265. enet_uint32 windowSize = (peer->packetThrottle * peer->windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE;
  2266. if (peer->reliableDataInTransit + outgoingCommand->fragmentLength > ENET_MAX(windowSize, peer->mtu))
  2267. windowExceeded = 1;
  2268. }
  2269. if (windowExceeded) {
  2270. currentCommand = enet_list_next(currentCommand);
  2271. continue;
  2272. }
  2273. }
  2274. canPing = 0;
  2275. commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK];
  2276. 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))) {
  2277. host->continueSending = 1;
  2278. break;
  2279. }
  2280. currentCommand = enet_list_next(currentCommand);
  2281. if (channel != NULL && outgoingCommand->sendAttempts < 1) {
  2282. channel->usedReliableWindows |= 1 << reliableWindow;
  2283. ++channel->reliableWindows[reliableWindow];
  2284. }
  2285. ++outgoingCommand->sendAttempts;
  2286. if (outgoingCommand->roundTripTimeout == 0) {
  2287. outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance;
  2288. outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout;
  2289. }
  2290. if (enet_list_empty(&peer->sentReliableCommands))
  2291. peer->nextTimeout = host->serviceTime + outgoingCommand->roundTripTimeout;
  2292. enet_list_insert(enet_list_end(&peer->sentReliableCommands), enet_list_remove(&outgoingCommand->outgoingCommandList));
  2293. outgoingCommand->sentTime = host->serviceTime;
  2294. buffer->data = command;
  2295. buffer->dataLength = commandSize;
  2296. host->packetSize += buffer->dataLength;
  2297. host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_SENT_TIME;
  2298. *command = outgoingCommand->command;
  2299. if (outgoingCommand->packet != NULL) {
  2300. ++buffer;
  2301. buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset;
  2302. buffer->dataLength = outgoingCommand->fragmentLength;
  2303. host->packetSize += outgoingCommand->fragmentLength;
  2304. peer->reliableDataInTransit += outgoingCommand->fragmentLength;
  2305. }
  2306. ++peer->packetsSent;
  2307. ++peer->totalPacketsSent;
  2308. ++command;
  2309. ++buffer;
  2310. }
  2311. host->commandCount = command - host->commands;
  2312. host->bufferCount = buffer - host->buffers;
  2313. return canPing;
  2314. }
  2315. static int enet_protocol_send_outgoing_commands(ENetHost* host, ENetEvent* event, int checkForTimeouts) {
  2316. enet_uint8 headerData[sizeof(ENetProtocolHeader) + sizeof(enet_uint32)];
  2317. ENetProtocolHeader* header = (ENetProtocolHeader*)headerData;
  2318. ENetPeer* currentPeer;
  2319. int sentLength;
  2320. host->continueSending = 1;
  2321. while (host->continueSending) {
  2322. for (host->continueSending = 0, currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  2323. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED || currentPeer->state == ENET_PEER_STATE_ZOMBIE)
  2324. continue;
  2325. host->headerFlags = 0;
  2326. host->commandCount = 0;
  2327. host->bufferCount = 1;
  2328. host->packetSize = sizeof(ENetProtocolHeader);
  2329. if (!enet_list_empty(&currentPeer->acknowledgements))
  2330. enet_protocol_send_acknowledgements(host, currentPeer);
  2331. if (checkForTimeouts != 0 && !enet_list_empty(&currentPeer->sentReliableCommands) && ENET_TIME_GREATER_EQUAL(host->serviceTime, currentPeer->nextTimeout) && enet_protocol_check_timeouts(host, currentPeer, event) == 1) {
  2332. if (event != NULL && event->type != ENET_EVENT_TYPE_NONE)
  2333. return 1;
  2334. else
  2335. continue;
  2336. }
  2337. 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)) {
  2338. enet_peer_ping(currentPeer);
  2339. enet_protocol_send_reliable_outgoing_commands(host, currentPeer);
  2340. }
  2341. if (!enet_list_empty(&currentPeer->outgoingUnreliableCommands))
  2342. enet_protocol_send_unreliable_outgoing_commands(host, currentPeer);
  2343. if (host->commandCount == 0)
  2344. continue;
  2345. if (currentPeer->packetLossEpoch == 0) {
  2346. currentPeer->packetLossEpoch = host->serviceTime;
  2347. }
  2348. else if (ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->packetLossEpoch) >= ENET_PEER_PACKET_LOSS_INTERVAL && currentPeer->packetsSent > 0) {
  2349. enet_uint32 packetLoss = currentPeer->packetsLost * ENET_PEER_PACKET_LOSS_SCALE / currentPeer->packetsSent;
  2350. ENET_LOG_TRACE(
  2351. "peer %u: %3.3f%% (+-%3.3f%%) pkt loss, %u ms RTT (+-%u ms Jitter), %3.2f%% throttle, reliable list sizes: %u/%u out, %u/%u in\n", currentPeer->incomingPeerID,
  2352. (currentPeer->packetLoss / (float)ENET_PEER_PACKET_LOSS_SCALE) * 100,
  2353. (currentPeer->packetLossVariance / (float)ENET_PEER_PACKET_LOSS_SCALE) * 100, currentPeer->roundTripTime, currentPeer->roundTripTimeVariance,
  2354. (currentPeer->packetThrottle / (float)ENET_PEER_PACKET_THROTTLE_SCALE) * 100,
  2355. enet_list_size(&currentPeer->outgoingReliableCommands),
  2356. enet_list_size(&currentPeer->outgoingUnreliableCommands),
  2357. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingReliableCommands) : 0,
  2358. currentPeer->channels != NULL ? enet_list_size(&currentPeer->channels->incomingUnreliableCommands) : 0
  2359. );
  2360. currentPeer->packetLossVariance -= currentPeer->packetLossVariance / 4;
  2361. if (packetLoss >= currentPeer->packetLoss) {
  2362. currentPeer->packetLoss += (packetLoss - currentPeer->packetLoss) / 8;
  2363. currentPeer->packetLossVariance += (packetLoss - currentPeer->packetLoss) / 4;
  2364. }
  2365. else {
  2366. currentPeer->packetLoss -= (currentPeer->packetLoss - packetLoss) / 8;
  2367. currentPeer->packetLossVariance += (currentPeer->packetLoss - packetLoss) / 4;
  2368. }
  2369. currentPeer->packetLossEpoch = host->serviceTime;
  2370. currentPeer->packetsSent = 0;
  2371. currentPeer->packetsLost = 0;
  2372. }
  2373. host->buffers->data = headerData;
  2374. if (host->headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME) {
  2375. header->sentTime = ENET_HOST_TO_NET_16(host->serviceTime & 0xFFFF);
  2376. host->buffers->dataLength = sizeof(ENetProtocolHeader);
  2377. }
  2378. else {
  2379. host->buffers->dataLength = (size_t) & ((ENetProtocolHeader*)0)->sentTime;
  2380. }
  2381. if (currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID)
  2382. host->headerFlags |= currentPeer->outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT;
  2383. header->peerID = ENET_HOST_TO_NET_16(currentPeer->outgoingPeerID | host->headerFlags);
  2384. if (host->checksumCallback != NULL) {
  2385. enet_uint32* checksum = (enet_uint32*)& headerData[host->buffers->dataLength];
  2386. *checksum = currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer->connectID : 0;
  2387. host->buffers->dataLength += sizeof(enet_uint32);
  2388. *checksum = host->checksumCallback(host->buffers, host->bufferCount);
  2389. }
  2390. currentPeer->lastSendTime = host->serviceTime;
  2391. sentLength = enet_socket_send(host->socket, &currentPeer->address, host->buffers, host->bufferCount);
  2392. enet_protocol_remove_sent_unreliable_commands(currentPeer);
  2393. if (sentLength < 0) {
  2394. ENET_LOG_ERROR("sentLength was negative: %i", sentLength);
  2395. return ENET_PACKET_DATA_LENGTH_NEGATIVE;
  2396. }
  2397. host->totalSentData += sentLength;
  2398. currentPeer->totalDataSent += sentLength;
  2399. host->totalSentPackets++;
  2400. }
  2401. }
  2402. return 0;
  2403. }
  2404. void enet_host_flush(ENetHost* host) {
  2405. host->serviceTime = enet_time_get();
  2406. enet_protocol_send_outgoing_commands(host, NULL, 0);
  2407. }
  2408. int enet_host_check_events(ENetHost* host, ENetEvent* event) {
  2409. if (event == NULL)
  2410. // Coburn: Probably not needed to put debug here?
  2411. return -1;
  2412. event->type = ENET_EVENT_TYPE_NONE;
  2413. event->peer = NULL;
  2414. event->packet = NULL;
  2415. return enet_protocol_dispatch_incoming_commands(host, event);
  2416. }
  2417. int enet_host_service(ENetHost* host, ENetEvent* event, enet_uint32 timeout) {
  2418. enet_uint32 waitCondition;
  2419. if (event != NULL) {
  2420. event->type = ENET_EVENT_TYPE_NONE;
  2421. event->peer = NULL;
  2422. event->packet = NULL;
  2423. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2424. case 1:
  2425. return 1;
  2426. case -1:
  2427. ENET_LOG_ERROR("Error dispatching incoming packets");
  2428. return ENET_DISPATCH_INCOMING_FAILURE;
  2429. default:
  2430. break;
  2431. }
  2432. }
  2433. host->serviceTime = enet_time_get();
  2434. timeout += host->serviceTime;
  2435. do {
  2436. if (ENET_TIME_DIFFERENCE(host->serviceTime, host->bandwidthThrottleEpoch) >= ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  2437. enet_host_bandwidth_throttle(host);
  2438. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2439. case 1:
  2440. return 1;
  2441. case -1:
  2442. ENET_LOG_ERROR("Error sending outgoing packets");
  2443. return ENET_SERVICE_SEND_OUTGOING_FAILURE;
  2444. default:
  2445. break;
  2446. }
  2447. switch (enet_protocol_receive_incoming_commands(host, event)) {
  2448. case 1:
  2449. return 1;
  2450. case -1:
  2451. ENET_LOG_ERROR("Error receiving incoming packets");
  2452. return ENET_SERVICE_RECEIVE_INCOMING_FAILURE;
  2453. default:
  2454. break;
  2455. }
  2456. switch (enet_protocol_send_outgoing_commands(host, event, 1)) {
  2457. case 1:
  2458. return 1;
  2459. case -1:
  2460. ENET_LOG_ERROR("Error dispatching outgoing packets!");
  2461. return ENET_DISPATCH_OUTGOING_FAILURE;
  2462. default:
  2463. break;
  2464. }
  2465. if (event != NULL) {
  2466. switch (enet_protocol_dispatch_incoming_commands(host, event)) {
  2467. case 1:
  2468. return 1;
  2469. case -1:
  2470. ENET_LOG_ERROR("Error dispatching incoming packets!");
  2471. return ENET_DISPATCH_INCOMING_FAILURE;
  2472. default:
  2473. break;
  2474. }
  2475. }
  2476. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2477. return 0;
  2478. do {
  2479. host->serviceTime = enet_time_get();
  2480. if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout))
  2481. return 0;
  2482. waitCondition = ENET_SOCKET_WAIT_RECEIVE | ENET_SOCKET_WAIT_INTERRUPT;
  2483. if (enet_socket_wait(host->socket, &waitCondition, ENET_TIME_DIFFERENCE(timeout, host->serviceTime)) != 0)
  2484. // Coburn: Is this an error?
  2485. return -1;
  2486. }
  2487. while (waitCondition & ENET_SOCKET_WAIT_INTERRUPT);
  2488. host->serviceTime = enet_time_get();
  2489. }
  2490. while (waitCondition & ENET_SOCKET_WAIT_RECEIVE);
  2491. return 0;
  2492. }
  2493. /*
  2494. =======================================================================
  2495. Peer
  2496. =======================================================================
  2497. */
  2498. void enet_peer_throttle_configure(ENetPeer* peer, enet_uint32 interval, enet_uint32 acceleration, enet_uint32 deceleration, enet_uint32 threshold) {
  2499. ENetProtocol command;
  2500. peer->packetThrottleThreshold = threshold;
  2501. peer->packetThrottleInterval = interval;
  2502. peer->packetThrottleAcceleration = acceleration;
  2503. peer->packetThrottleDeceleration = deceleration;
  2504. command.header.command = ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2505. command.header.channelID = 0xFF;
  2506. command.throttleConfigure.packetThrottleInterval = ENET_HOST_TO_NET_32(interval);
  2507. command.throttleConfigure.packetThrottleAcceleration = ENET_HOST_TO_NET_32(acceleration);
  2508. command.throttleConfigure.packetThrottleDeceleration = ENET_HOST_TO_NET_32(deceleration);
  2509. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2510. }
  2511. int enet_peer_throttle(ENetPeer* peer, enet_uint32 rtt) {
  2512. if (peer->lastRoundTripTime <= peer->lastRoundTripTimeVariance) {
  2513. peer->packetThrottle = peer->packetThrottleLimit;
  2514. }
  2515. else if (rtt < peer->lastRoundTripTime) {
  2516. peer->packetThrottle += peer->packetThrottleAcceleration;
  2517. if (peer->packetThrottle > peer->packetThrottleLimit)
  2518. peer->packetThrottle = peer->packetThrottleLimit;
  2519. return 1;
  2520. }
  2521. else if (rtt > peer->lastRoundTripTime + peer->packetThrottleThreshold + 2 * peer->lastRoundTripTimeVariance) {
  2522. if (peer->packetThrottle > peer->packetThrottleDeceleration)
  2523. peer->packetThrottle -= peer->packetThrottleDeceleration;
  2524. else
  2525. peer->packetThrottle = 0;
  2526. // Coburn: Not sure if this is an error condition
  2527. return -1;
  2528. }
  2529. return 0;
  2530. }
  2531. int enet_peer_send(ENetPeer* peer, enet_uint8 channelID, ENetPacket* packet) {
  2532. ENetChannel* channel = &peer->channels[channelID];
  2533. ENetProtocol command;
  2534. size_t fragmentLength;
  2535. if (peer->state != ENET_PEER_STATE_CONNECTED || channelID >= peer->channelCount || packet->dataLength > peer->host->maximumPacketSize) {
  2536. 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");
  2537. return ENET_PEER_SENDFAIL_GENERIC;
  2538. }
  2539. fragmentLength = peer->mtu - sizeof(ENetProtocolHeader) - sizeof(ENetProtocolSendFragment);
  2540. if (peer->host->checksumCallback != NULL)
  2541. fragmentLength -= sizeof(enet_uint32);
  2542. if (packet->dataLength > fragmentLength) {
  2543. enet_uint32 fragmentCount = (packet->dataLength + fragmentLength - 1) / fragmentLength, fragmentNumber, fragmentOffset;
  2544. enet_uint8 commandNumber;
  2545. enet_uint16 startSequenceNumber;
  2546. ENetList fragments;
  2547. ENetOutgoingCommand* fragment;
  2548. if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT) {
  2549. ENET_LOG_ERROR("Cannot send data. Too many fragments (%u vs %u)", fragmentCount, ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT);
  2550. return ENET_PEER_SENDFAIL_FRAGMENTOVERLOAD;
  2551. }
  2552. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED)) == ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED && channel->outgoingUnreliableSequenceNumber < 0xFFFF) {
  2553. commandNumber = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT;
  2554. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingUnreliableSequenceNumber + 1);
  2555. }
  2556. else {
  2557. commandNumber = ENET_PROTOCOL_COMMAND_SEND_FRAGMENT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2558. startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingReliableSequenceNumber + 1);
  2559. }
  2560. enet_list_clear(&fragments);
  2561. for (fragmentNumber = 0, fragmentOffset = 0; fragmentOffset < packet->dataLength; ++fragmentNumber, fragmentOffset += fragmentLength) {
  2562. if (packet->dataLength - fragmentOffset < fragmentLength)
  2563. fragmentLength = packet->dataLength - fragmentOffset;
  2564. fragment = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2565. if (fragment == NULL) {
  2566. while (!enet_list_empty(&fragments)) {
  2567. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2568. enet_free(fragment);
  2569. }
  2570. ENET_LOG_ERROR("Cannot send data. A fragment was null.");
  2571. return ENET_PEER_SENDFAIL_FRAGMENTNULL;
  2572. }
  2573. fragment->fragmentOffset = fragmentOffset;
  2574. fragment->fragmentLength = fragmentLength;
  2575. fragment->packet = packet;
  2576. fragment->command.header.command = commandNumber;
  2577. fragment->command.header.channelID = channelID;
  2578. fragment->command.sendFragment.startSequenceNumber = startSequenceNumber;
  2579. fragment->command.sendFragment.dataLength = ENET_HOST_TO_NET_16(fragmentLength);
  2580. fragment->command.sendFragment.fragmentCount = ENET_HOST_TO_NET_32(fragmentCount);
  2581. fragment->command.sendFragment.fragmentNumber = ENET_HOST_TO_NET_32(fragmentNumber);
  2582. fragment->command.sendFragment.totalLength = ENET_HOST_TO_NET_32(packet->dataLength);
  2583. fragment->command.sendFragment.fragmentOffset = ENET_NET_TO_HOST_32(fragmentOffset);
  2584. enet_list_insert(enet_list_end(&fragments), fragment);
  2585. }
  2586. packet->referenceCount += fragmentNumber;
  2587. while (!enet_list_empty(&fragments)) {
  2588. fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments));
  2589. enet_peer_setup_outgoing_command(peer, fragment);
  2590. }
  2591. return 0;
  2592. }
  2593. command.header.channelID = channelID;
  2594. if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNSEQUENCED)) == ENET_PACKET_FLAG_UNSEQUENCED) {
  2595. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2596. command.sendUnsequenced.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2597. }
  2598. else if (packet->flags & ENET_PACKET_FLAG_RELIABLE || channel->outgoingUnreliableSequenceNumber >= 0xFFFF) {
  2599. command.header.command = ENET_PROTOCOL_COMMAND_SEND_RELIABLE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2600. command.sendReliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2601. }
  2602. else {
  2603. command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE;
  2604. command.sendUnreliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength);
  2605. }
  2606. if (enet_peer_queue_outgoing_command(peer, &command, packet, 0, packet->dataLength) == NULL) {
  2607. ENET_LOG_ERROR("a queued outgoing command was NULL");
  2608. return ENET_PEER_QUEUE_OUTGOING_NULL;
  2609. }
  2610. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  2611. enet_host_flush(peer->host);
  2612. return 0;
  2613. }
  2614. ENetPacket* enet_peer_receive(ENetPeer* peer, enet_uint8* channelID) {
  2615. ENetIncomingCommand* incomingCommand;
  2616. ENetPacket* packet;
  2617. if (enet_list_empty(&peer->dispatchedCommands))
  2618. return NULL;
  2619. incomingCommand = (ENetIncomingCommand*)enet_list_remove(enet_list_begin(&peer->dispatchedCommands));
  2620. if (channelID != NULL)
  2621. * channelID = incomingCommand->command.header.channelID;
  2622. packet = incomingCommand->packet;
  2623. --packet->referenceCount;
  2624. if (incomingCommand->fragments != NULL)
  2625. enet_free(incomingCommand->fragments);
  2626. enet_free(incomingCommand);
  2627. peer->totalWaitingData -= packet->dataLength;
  2628. return packet;
  2629. }
  2630. static void enet_peer_reset_outgoing_commands(ENetList* queue) {
  2631. ENetOutgoingCommand* outgoingCommand;
  2632. while (!enet_list_empty(queue)) {
  2633. outgoingCommand = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(queue));
  2634. if (outgoingCommand->packet != NULL) {
  2635. --outgoingCommand->packet->referenceCount;
  2636. if (outgoingCommand->packet->referenceCount == 0)
  2637. enet_packet_destroy(outgoingCommand->packet);
  2638. }
  2639. enet_free(outgoingCommand);
  2640. }
  2641. }
  2642. static void enet_peer_remove_incoming_commands(ENetList* queue, ENetListIterator startCommand, ENetListIterator endCommand) {
  2643. ENetListIterator currentCommand;
  2644. for (currentCommand = startCommand; currentCommand != endCommand;) {
  2645. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2646. currentCommand = enet_list_next(currentCommand);
  2647. enet_list_remove(&incomingCommand->incomingCommandList);
  2648. if (incomingCommand->packet != NULL) {
  2649. --incomingCommand->packet->referenceCount;
  2650. if (incomingCommand->packet->referenceCount == 0)
  2651. enet_packet_destroy(incomingCommand->packet);
  2652. }
  2653. if (incomingCommand->fragments != NULL)
  2654. enet_free(incomingCommand->fragments);
  2655. enet_free(incomingCommand);
  2656. }
  2657. }
  2658. static void enet_peer_reset_incoming_commands(ENetList* queue) {
  2659. enet_peer_remove_incoming_commands(queue, enet_list_begin(queue), enet_list_end(queue));
  2660. }
  2661. void enet_peer_reset_queues(ENetPeer* peer) {
  2662. ENetChannel* channel;
  2663. if (peer->needsDispatch) {
  2664. enet_list_remove(&peer->dispatchList);
  2665. peer->needsDispatch = 0;
  2666. }
  2667. while (!enet_list_empty(&peer->acknowledgements)) {
  2668. enet_free(enet_list_remove(enet_list_begin(&peer->acknowledgements)));
  2669. }
  2670. enet_peer_reset_outgoing_commands(&peer->sentReliableCommands);
  2671. enet_peer_reset_outgoing_commands(&peer->sentUnreliableCommands);
  2672. enet_peer_reset_outgoing_commands(&peer->outgoingReliableCommands);
  2673. enet_peer_reset_outgoing_commands(&peer->outgoingUnreliableCommands);
  2674. enet_peer_reset_incoming_commands(&peer->dispatchedCommands);
  2675. if (peer->channels != NULL && peer->channelCount > 0) {
  2676. for (channel = peer->channels; channel < &peer->channels[peer->channelCount]; ++channel) {
  2677. enet_peer_reset_incoming_commands(&channel->incomingReliableCommands);
  2678. enet_peer_reset_incoming_commands(&channel->incomingUnreliableCommands);
  2679. }
  2680. enet_free(peer->channels);
  2681. }
  2682. peer->channels = NULL;
  2683. peer->channelCount = 0;
  2684. }
  2685. void enet_peer_on_connect(ENetPeer* peer) {
  2686. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) {
  2687. if (peer->incomingBandwidth != 0)
  2688. ++peer->host->bandwidthLimitedPeers;
  2689. ++peer->host->connectedPeers;
  2690. }
  2691. }
  2692. void enet_peer_on_disconnect(ENetPeer* peer) {
  2693. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2694. if (peer->incomingBandwidth != 0)
  2695. --peer->host->bandwidthLimitedPeers;
  2696. --peer->host->connectedPeers;
  2697. }
  2698. }
  2699. void enet_peer_reset(ENetPeer* peer) {
  2700. enet_peer_on_disconnect(peer);
  2701. peer->outgoingPeerID = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  2702. peer->state = ENET_PEER_STATE_DISCONNECTED;
  2703. peer->incomingBandwidth = 0;
  2704. peer->outgoingBandwidth = 0;
  2705. peer->incomingBandwidthThrottleEpoch = 0;
  2706. peer->outgoingBandwidthThrottleEpoch = 0;
  2707. peer->incomingDataTotal = 0;
  2708. peer->totalDataReceived = 0;
  2709. peer->outgoingDataTotal = 0;
  2710. peer->totalDataSent = 0;
  2711. peer->lastSendTime = 0;
  2712. peer->lastReceiveTime = 0;
  2713. peer->nextTimeout = 0;
  2714. peer->earliestTimeout = 0;
  2715. peer->packetLossEpoch = 0;
  2716. peer->packetsSent = 0;
  2717. peer->totalPacketsSent = 0;
  2718. peer->packetsLost = 0;
  2719. peer->totalPacketsLost = 0;
  2720. peer->packetLoss = 0;
  2721. peer->packetLossVariance = 0;
  2722. peer->packetThrottle = ENET_PEER_DEFAULT_PACKET_THROTTLE;
  2723. peer->packetThrottleLimit = ENET_PEER_PACKET_THROTTLE_SCALE;
  2724. peer->packetThrottleCounter = 0;
  2725. peer->packetThrottleEpoch = 0;
  2726. peer->packetThrottleAcceleration = ENET_PEER_PACKET_THROTTLE_ACCELERATION;
  2727. peer->packetThrottleDeceleration = ENET_PEER_PACKET_THROTTLE_DECELERATION;
  2728. peer->packetThrottleInterval = ENET_PEER_PACKET_THROTTLE_INTERVAL;
  2729. peer->pingInterval = ENET_PEER_PING_INTERVAL;
  2730. peer->timeoutLimit = ENET_PEER_TIMEOUT_LIMIT;
  2731. peer->timeoutMinimum = ENET_PEER_TIMEOUT_MINIMUM;
  2732. peer->timeoutMaximum = ENET_PEER_TIMEOUT_MAXIMUM;
  2733. peer->smoothedRoundTripTime = 0;
  2734. peer->lastRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2735. peer->lowestRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2736. peer->lastRoundTripTimeVariance = 0;
  2737. peer->highestRoundTripTimeVariance = 0;
  2738. peer->roundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME;
  2739. peer->roundTripTimeVariance = 0;
  2740. peer->mtu = peer->host->mtu;
  2741. peer->reliableDataInTransit = 0;
  2742. peer->outgoingReliableSequenceNumber = 0;
  2743. peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  2744. peer->incomingUnsequencedGroup = 0;
  2745. peer->outgoingUnsequencedGroup = 0;
  2746. peer->eventData = 0;
  2747. peer->totalWaitingData = 0;
  2748. memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow));
  2749. enet_peer_reset_queues(peer);
  2750. }
  2751. void enet_peer_ping(ENetPeer* peer) {
  2752. ENetProtocol command;
  2753. if (peer->state != ENET_PEER_STATE_CONNECTED)
  2754. return;
  2755. command.header.command = ENET_PROTOCOL_COMMAND_PING | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2756. command.header.channelID = 0xFF;
  2757. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2758. }
  2759. void enet_peer_ping_interval(ENetPeer* peer, enet_uint32 pingInterval) {
  2760. peer->pingInterval = pingInterval ? pingInterval : ENET_PEER_PING_INTERVAL;
  2761. }
  2762. void enet_peer_timeout(ENetPeer* peer, enet_uint32 timeoutLimit, enet_uint32 timeoutMinimum, enet_uint32 timeoutMaximum) {
  2763. peer->timeoutLimit = timeoutLimit ? timeoutLimit : ENET_PEER_TIMEOUT_LIMIT;
  2764. peer->timeoutMinimum = timeoutMinimum ? timeoutMinimum : ENET_PEER_TIMEOUT_MINIMUM;
  2765. peer->timeoutMaximum = timeoutMaximum ? timeoutMaximum : ENET_PEER_TIMEOUT_MAXIMUM;
  2766. }
  2767. void enet_peer_disconnect_now(ENetPeer* peer, enet_uint32 data) {
  2768. ENetProtocol command;
  2769. if (peer->state == ENET_PEER_STATE_DISCONNECTED)
  2770. return;
  2771. if (peer->state != ENET_PEER_STATE_ZOMBIE && peer->state != ENET_PEER_STATE_DISCONNECTING) {
  2772. enet_peer_reset_queues(peer);
  2773. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2774. command.header.channelID = 0xFF;
  2775. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2776. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2777. enet_host_flush(peer->host);
  2778. }
  2779. enet_peer_reset(peer);
  2780. }
  2781. void enet_peer_disconnect(ENetPeer* peer, enet_uint32 data) {
  2782. ENetProtocol command;
  2783. 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)
  2784. return;
  2785. enet_peer_reset_queues(peer);
  2786. command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT;
  2787. command.header.channelID = 0xFF;
  2788. command.disconnect.data = ENET_HOST_TO_NET_32(data);
  2789. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2790. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  2791. else
  2792. command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED;
  2793. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  2794. if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) {
  2795. enet_peer_on_disconnect(peer);
  2796. peer->state = ENET_PEER_STATE_DISCONNECTING;
  2797. }
  2798. else {
  2799. enet_host_flush(peer->host);
  2800. enet_peer_reset(peer);
  2801. }
  2802. }
  2803. void enet_peer_disconnect_later(ENetPeer* peer, enet_uint32 data) {
  2804. 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))) {
  2805. peer->state = ENET_PEER_STATE_DISCONNECT_LATER;
  2806. peer->eventData = data;
  2807. }
  2808. else {
  2809. enet_peer_disconnect(peer, data);
  2810. }
  2811. }
  2812. ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer* peer, const ENetProtocol* command, enet_uint16 sentTime) {
  2813. ENetAcknowledgement* acknowledgement;
  2814. if (command->header.channelID < peer->channelCount) {
  2815. ENetChannel* channel = &peer->channels[command->header.channelID];
  2816. enet_uint16 reliableWindow = command->header.reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2817. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2818. if (command->header.reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2819. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2820. if (reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1 && reliableWindow <= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS)
  2821. return NULL;
  2822. }
  2823. acknowledgement = (ENetAcknowledgement*)enet_malloc(sizeof(ENetAcknowledgement));
  2824. if (acknowledgement == NULL)
  2825. return NULL;
  2826. peer->outgoingDataTotal += sizeof(ENetProtocolAcknowledge);
  2827. acknowledgement->sentTime = sentTime;
  2828. acknowledgement->command = *command;
  2829. enet_list_insert(enet_list_end(&peer->acknowledgements), acknowledgement);
  2830. return acknowledgement;
  2831. }
  2832. void enet_peer_setup_outgoing_command(ENetPeer* peer, ENetOutgoingCommand* outgoingCommand) {
  2833. ENetChannel* channel = &peer->channels[outgoingCommand->command.header.channelID];
  2834. peer->outgoingDataTotal += enet_protocol_command_size(outgoingCommand->command.header.command) + outgoingCommand->fragmentLength;
  2835. if (outgoingCommand->command.header.channelID == 0xFF) {
  2836. ++peer->outgoingReliableSequenceNumber;
  2837. outgoingCommand->reliableSequenceNumber = peer->outgoingReliableSequenceNumber;
  2838. outgoingCommand->unreliableSequenceNumber = 0;
  2839. }
  2840. else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) {
  2841. ++channel->outgoingReliableSequenceNumber;
  2842. channel->outgoingUnreliableSequenceNumber = 0;
  2843. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2844. outgoingCommand->unreliableSequenceNumber = 0;
  2845. }
  2846. else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED) {
  2847. ++peer->outgoingUnsequencedGroup;
  2848. outgoingCommand->reliableSequenceNumber = 0;
  2849. outgoingCommand->unreliableSequenceNumber = 0;
  2850. }
  2851. else {
  2852. if (outgoingCommand->fragmentOffset == 0)
  2853. ++channel->outgoingUnreliableSequenceNumber;
  2854. outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber;
  2855. outgoingCommand->unreliableSequenceNumber = channel->outgoingUnreliableSequenceNumber;
  2856. }
  2857. outgoingCommand->sendAttempts = 0;
  2858. outgoingCommand->sentTime = 0;
  2859. outgoingCommand->roundTripTimeout = 0;
  2860. outgoingCommand->roundTripTimeoutLimit = 0;
  2861. outgoingCommand->command.header.reliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->reliableSequenceNumber);
  2862. switch (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2863. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  2864. outgoingCommand->command.sendUnreliable.unreliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->unreliableSequenceNumber);
  2865. break;
  2866. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  2867. outgoingCommand->command.sendUnsequenced.unsequencedGroup = ENET_HOST_TO_NET_16(peer->outgoingUnsequencedGroup);
  2868. break;
  2869. default:
  2870. break;
  2871. }
  2872. if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)
  2873. enet_list_insert(enet_list_end(&peer->outgoingReliableCommands), outgoingCommand);
  2874. else
  2875. enet_list_insert(enet_list_end(&peer->outgoingUnreliableCommands), outgoingCommand);
  2876. }
  2877. ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer* peer, const ENetProtocol* command, ENetPacket* packet, enet_uint32 offset, enet_uint16 length) {
  2878. ENetOutgoingCommand* outgoingCommand = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand));
  2879. if (outgoingCommand == NULL)
  2880. return NULL;
  2881. outgoingCommand->command = *command;
  2882. outgoingCommand->fragmentOffset = offset;
  2883. outgoingCommand->fragmentLength = length;
  2884. outgoingCommand->packet = packet;
  2885. if (packet != NULL)
  2886. ++packet->referenceCount;
  2887. enet_peer_setup_outgoing_command(peer, outgoingCommand);
  2888. return outgoingCommand;
  2889. }
  2890. void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2891. ENetListIterator droppedCommand, startCommand, currentCommand;
  2892. for (droppedCommand = startCommand = currentCommand = enet_list_begin(&channel->incomingUnreliableCommands); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2893. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2894. if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  2895. continue;
  2896. if (incomingCommand->reliableSequenceNumber == channel->incomingReliableSequenceNumber) {
  2897. if (incomingCommand->fragmentsRemaining <= 0) {
  2898. channel->incomingUnreliableSequenceNumber = incomingCommand->unreliableSequenceNumber;
  2899. continue;
  2900. }
  2901. if (startCommand != currentCommand) {
  2902. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2903. if (!peer->needsDispatch) {
  2904. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2905. peer->needsDispatch = 1;
  2906. }
  2907. droppedCommand = currentCommand;
  2908. }
  2909. else if (droppedCommand != currentCommand)
  2910. droppedCommand = enet_list_previous(currentCommand);
  2911. }
  2912. else {
  2913. enet_uint16 reliableWindow = incomingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2914. enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2915. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2916. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2917. if (reliableWindow >= currentWindow && reliableWindow < currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2918. break;
  2919. droppedCommand = enet_list_next(currentCommand);
  2920. if (startCommand != currentCommand) {
  2921. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2922. if (!peer->needsDispatch) {
  2923. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2924. peer->needsDispatch = 1;
  2925. }
  2926. }
  2927. }
  2928. startCommand = enet_list_next(currentCommand);
  2929. }
  2930. if (startCommand != currentCommand) {
  2931. enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand));
  2932. if (!peer->needsDispatch) {
  2933. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2934. peer->needsDispatch = 1;
  2935. }
  2936. droppedCommand = currentCommand;
  2937. }
  2938. enet_peer_remove_incoming_commands(&channel->incomingUnreliableCommands, enet_list_begin(&channel->incomingUnreliableCommands), droppedCommand);
  2939. }
  2940. void enet_peer_dispatch_incoming_reliable_commands(ENetPeer* peer, ENetChannel* channel) {
  2941. ENetListIterator currentCommand;
  2942. for (currentCommand = enet_list_begin(&channel->incomingReliableCommands); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_next(currentCommand)) {
  2943. ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand;
  2944. if (incomingCommand->fragmentsRemaining > 0 || incomingCommand->reliableSequenceNumber != (enet_uint16)(channel->incomingReliableSequenceNumber + 1))
  2945. break;
  2946. channel->incomingReliableSequenceNumber = incomingCommand->reliableSequenceNumber;
  2947. if (incomingCommand->fragmentCount > 0)
  2948. channel->incomingReliableSequenceNumber += incomingCommand->fragmentCount - 1;
  2949. }
  2950. if (currentCommand == enet_list_begin(&channel->incomingReliableCommands))
  2951. return;
  2952. channel->incomingUnreliableSequenceNumber = 0;
  2953. enet_list_move(enet_list_end(&peer->dispatchedCommands), enet_list_begin(&channel->incomingReliableCommands), enet_list_previous(currentCommand));
  2954. if (!peer->needsDispatch) {
  2955. enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList);
  2956. peer->needsDispatch = 1;
  2957. }
  2958. if (!enet_list_empty(&channel->incomingUnreliableCommands))
  2959. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  2960. }
  2961. ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer* peer, const ENetProtocol* command, const void* data, size_t dataLength, enet_uint32 flags, enet_uint32 fragmentCount) {
  2962. static ENetIncomingCommand dummyCommand;
  2963. ENetChannel* channel = &peer->channels[command->header.channelID];
  2964. enet_uint32 unreliableSequenceNumber = 0, reliableSequenceNumber = 0;
  2965. enet_uint16 reliableWindow, currentWindow;
  2966. ENetIncomingCommand* incomingCommand;
  2967. ENetListIterator currentCommand;
  2968. ENetPacket* packet = NULL;
  2969. if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER)
  2970. goto discardCommand;
  2971. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) {
  2972. reliableSequenceNumber = command->header.reliableSequenceNumber;
  2973. reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2974. currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
  2975. if (reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2976. reliableWindow += ENET_PEER_RELIABLE_WINDOWS;
  2977. if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)
  2978. goto discardCommand;
  2979. }
  2980. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  2981. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  2982. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  2983. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber)
  2984. goto discardCommand;
  2985. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  2986. incomingCommand = (ENetIncomingCommand*)currentCommand;
  2987. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2988. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  2989. continue;
  2990. }
  2991. else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  2992. break;
  2993. }
  2994. if (incomingCommand->reliableSequenceNumber <= reliableSequenceNumber) {
  2995. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  2996. break;
  2997. goto discardCommand;
  2998. }
  2999. }
  3000. break;
  3001. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
  3002. case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT:
  3003. unreliableSequenceNumber = ENET_NET_TO_HOST_16(command->sendUnreliable.unreliableSequenceNumber);
  3004. if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && unreliableSequenceNumber <= channel->incomingUnreliableSequenceNumber)
  3005. goto discardCommand;
  3006. for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) {
  3007. incomingCommand = (ENetIncomingCommand*)currentCommand;
  3008. if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED)
  3009. continue;
  3010. if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  3011. if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber)
  3012. continue;
  3013. }
  3014. else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) {
  3015. break;
  3016. }
  3017. if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber)
  3018. break;
  3019. if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber)
  3020. continue;
  3021. if (incomingCommand->unreliableSequenceNumber <= unreliableSequenceNumber) {
  3022. if (incomingCommand->unreliableSequenceNumber < unreliableSequenceNumber)
  3023. break;
  3024. goto discardCommand;
  3025. }
  3026. }
  3027. break;
  3028. case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
  3029. currentCommand = enet_list_end(&channel->incomingUnreliableCommands);
  3030. break;
  3031. default:
  3032. goto discardCommand;
  3033. }
  3034. if (peer->totalWaitingData >= peer->host->maximumWaitingData)
  3035. goto notifyError;
  3036. packet = enet_packet_create(data, dataLength, flags);
  3037. if (packet == NULL)
  3038. goto notifyError;
  3039. incomingCommand = (ENetIncomingCommand*)enet_malloc(sizeof(ENetIncomingCommand));
  3040. if (incomingCommand == NULL)
  3041. goto notifyError;
  3042. incomingCommand->reliableSequenceNumber = command->header.reliableSequenceNumber;
  3043. incomingCommand->unreliableSequenceNumber = unreliableSequenceNumber & 0xFFFF;
  3044. incomingCommand->command = *command;
  3045. incomingCommand->fragmentCount = fragmentCount;
  3046. incomingCommand->fragmentsRemaining = fragmentCount;
  3047. incomingCommand->packet = packet;
  3048. incomingCommand->fragments = NULL;
  3049. if (fragmentCount > 0) {
  3050. if (fragmentCount <= ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT)
  3051. incomingCommand->fragments = (enet_uint32*)enet_malloc((fragmentCount + 31) / 32 * sizeof(enet_uint32));
  3052. if (incomingCommand->fragments == NULL) {
  3053. enet_free(incomingCommand);
  3054. goto notifyError;
  3055. }
  3056. memset(incomingCommand->fragments, 0, (fragmentCount + 31) / 32 * sizeof(enet_uint32));
  3057. }
  3058. if (packet != NULL) {
  3059. ++packet->referenceCount;
  3060. peer->totalWaitingData += packet->dataLength;
  3061. }
  3062. enet_list_insert(enet_list_next(currentCommand), incomingCommand);
  3063. switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) {
  3064. case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
  3065. case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
  3066. enet_peer_dispatch_incoming_reliable_commands(peer, channel);
  3067. break;
  3068. default:
  3069. enet_peer_dispatch_incoming_unreliable_commands(peer, channel);
  3070. break;
  3071. }
  3072. return incomingCommand;
  3073. discardCommand:
  3074. if (fragmentCount > 0)
  3075. goto notifyError;
  3076. if (packet != NULL && packet->referenceCount == 0)
  3077. enet_packet_destroy(packet);
  3078. return &dummyCommand;
  3079. notifyError:
  3080. if (packet != NULL && packet->referenceCount == 0)
  3081. enet_packet_destroy(packet);
  3082. return NULL;
  3083. }
  3084. /*
  3085. =======================================================================
  3086. Host
  3087. =======================================================================
  3088. */
  3089. ENetHost* enet_host_create(const ENetAddress* address, size_t peerCount, size_t channelLimit, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth, int bufferSize) {
  3090. ENetHost* host;
  3091. ENetPeer* currentPeer;
  3092. if (peerCount > ENET_PROTOCOL_MAXIMUM_PEER_ID)
  3093. return NULL;
  3094. host = (ENetHost*)enet_malloc(sizeof(ENetHost));
  3095. if (host == NULL)
  3096. return NULL;
  3097. memset(host, 0, sizeof(ENetHost));
  3098. host->peers = (ENetPeer*)enet_malloc(peerCount * sizeof(ENetPeer));
  3099. if (host->peers == NULL) {
  3100. enet_free(host);
  3101. return NULL;
  3102. }
  3103. memset(host->peers, 0, peerCount * sizeof(ENetPeer));
  3104. host->socket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
  3105. if (host->socket != ENET_SOCKET_NULL)
  3106. enet_socket_set_option(host->socket, ENET_SOCKOPT_IPV6_V6ONLY, 0);
  3107. if (host->socket == ENET_SOCKET_NULL || (address != NULL && enet_socket_bind(host->socket, address) < 0)) {
  3108. if (host->socket != ENET_SOCKET_NULL)
  3109. enet_socket_destroy(host->socket);
  3110. enet_free(host->peers);
  3111. enet_free(host);
  3112. return NULL;
  3113. }
  3114. if (bufferSize > ENET_HOST_BUFFER_SIZE_MAX)
  3115. bufferSize = ENET_HOST_BUFFER_SIZE_MAX;
  3116. else if (bufferSize < ENET_HOST_BUFFER_SIZE_MIN)
  3117. bufferSize = ENET_HOST_BUFFER_SIZE_MIN;
  3118. enet_socket_set_option(host->socket, ENET_SOCKOPT_NONBLOCK, 1);
  3119. enet_socket_set_option(host->socket, ENET_SOCKOPT_BROADCAST, 1);
  3120. enet_socket_set_option(host->socket, ENET_SOCKOPT_RCVBUF, bufferSize);
  3121. enet_socket_set_option(host->socket, ENET_SOCKOPT_SNDBUF, bufferSize);
  3122. if (address != NULL && enet_socket_get_address(host->socket, &host->address) < 0)
  3123. host->address = *address;
  3124. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3125. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3126. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3127. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3128. host->randomSeed = (enet_uint32)(size_t)host;
  3129. host->randomSeed += enet_host_random_seed();
  3130. host->randomSeed = (host->randomSeed << 16) | (host->randomSeed >> 16);
  3131. host->channelLimit = channelLimit;
  3132. host->incomingBandwidth = incomingBandwidth;
  3133. host->outgoingBandwidth = outgoingBandwidth;
  3134. host->bandwidthThrottleEpoch = 0;
  3135. host->recalculateBandwidthLimits = 0;
  3136. host->preventConnections = 0;
  3137. host->mtu = ENET_HOST_DEFAULT_MTU;
  3138. host->peerCount = peerCount;
  3139. host->commandCount = 0;
  3140. host->bufferCount = 0;
  3141. host->compression = 0;
  3142. host->compressionBufferSize = 0;
  3143. host->checksumCallback = NULL;
  3144. host->receivedAddress.ipv6 = ENET_HOST_ANY;
  3145. host->receivedAddress.port = 0;
  3146. host->receivedData = NULL;
  3147. host->receivedDataLength = 0;
  3148. host->totalSentData = 0;
  3149. host->totalSentPackets = 0;
  3150. host->totalReceivedData = 0;
  3151. host->totalReceivedPackets = 0;
  3152. host->connectedPeers = 0;
  3153. host->bandwidthLimitedPeers = 0;
  3154. host->duplicatePeers = ENET_PROTOCOL_MAXIMUM_PEER_ID;
  3155. host->maximumPacketSize = ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE;
  3156. host->maximumWaitingData = ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA;
  3157. host->interceptCallback = NULL;
  3158. enet_list_clear(&host->dispatchQueue);
  3159. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3160. currentPeer->host = host;
  3161. currentPeer->incomingPeerID = currentPeer - host->peers;
  3162. currentPeer->outgoingSessionID = currentPeer->incomingSessionID = 0xFF;
  3163. currentPeer->data = NULL;
  3164. enet_list_clear(&currentPeer->acknowledgements);
  3165. enet_list_clear(&currentPeer->sentReliableCommands);
  3166. enet_list_clear(&currentPeer->sentUnreliableCommands);
  3167. enet_list_clear(&currentPeer->outgoingReliableCommands);
  3168. enet_list_clear(&currentPeer->outgoingUnreliableCommands);
  3169. enet_list_clear(&currentPeer->dispatchedCommands);
  3170. enet_peer_reset(currentPeer);
  3171. }
  3172. ENET_LOG_TRACE("host created successfully\n");
  3173. return host;
  3174. }
  3175. void enet_host_destroy(ENetHost* host) {
  3176. ENetPeer* currentPeer;
  3177. if (host == NULL)
  3178. return;
  3179. enet_socket_destroy(host->socket);
  3180. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3181. enet_peer_reset(currentPeer);
  3182. }
  3183. enet_free(host->peers);
  3184. enet_free(host->compressionBuffer);
  3185. enet_free(host);
  3186. }
  3187. void enet_host_enable_compression(ENetHost* host) {
  3188. if (host == NULL)
  3189. return;
  3190. host->compression = 1;
  3191. }
  3192. void enet_host_prevent_connections(ENetHost* host, enet_uint8 state) {
  3193. if (host == NULL)
  3194. return;
  3195. host->preventConnections = state;
  3196. }
  3197. ENetPeer* enet_host_connect(ENetHost* host, const ENetAddress* address, size_t channelCount, enet_uint32 data) {
  3198. ENetPeer* currentPeer;
  3199. ENetChannel* channel;
  3200. ENetProtocol command;
  3201. if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3202. channelCount = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3203. else if (channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3204. channelCount = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3205. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3206. if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED)
  3207. break;
  3208. }
  3209. if (currentPeer >= &host->peers[host->peerCount])
  3210. return NULL;
  3211. currentPeer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel));
  3212. if (currentPeer->channels == NULL)
  3213. return NULL;
  3214. currentPeer->channelCount = channelCount;
  3215. currentPeer->state = ENET_PEER_STATE_CONNECTING;
  3216. currentPeer->address = *address;
  3217. currentPeer->connectID = ++host->randomSeed;
  3218. if (host->outgoingBandwidth == 0)
  3219. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3220. else
  3221. currentPeer->windowSize = (host->outgoingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3222. if (currentPeer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
  3223. currentPeer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
  3224. else if (currentPeer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
  3225. currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
  3226. for (channel = currentPeer->channels; channel < &currentPeer->channels[channelCount]; ++channel) {
  3227. channel->outgoingReliableSequenceNumber = 0;
  3228. channel->outgoingUnreliableSequenceNumber = 0;
  3229. channel->incomingReliableSequenceNumber = 0;
  3230. channel->incomingUnreliableSequenceNumber = 0;
  3231. enet_list_clear(&channel->incomingReliableCommands);
  3232. enet_list_clear(&channel->incomingUnreliableCommands);
  3233. channel->usedReliableWindows = 0;
  3234. memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows));
  3235. }
  3236. command.header.command = ENET_PROTOCOL_COMMAND_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3237. command.header.channelID = 0xFF;
  3238. command.connect.outgoingPeerID = ENET_HOST_TO_NET_16(currentPeer->incomingPeerID);
  3239. command.connect.incomingSessionID = currentPeer->incomingSessionID;
  3240. command.connect.outgoingSessionID = currentPeer->outgoingSessionID;
  3241. command.connect.mtu = ENET_HOST_TO_NET_32(currentPeer->mtu);
  3242. command.connect.windowSize = ENET_HOST_TO_NET_32(currentPeer->windowSize);
  3243. command.connect.channelCount = ENET_HOST_TO_NET_32(channelCount);
  3244. command.connect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
  3245. command.connect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3246. command.connect.packetThrottleInterval = ENET_HOST_TO_NET_32(currentPeer->packetThrottleInterval);
  3247. command.connect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleAcceleration);
  3248. command.connect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleDeceleration);
  3249. command.connect.connectID = currentPeer->connectID;
  3250. command.connect.data = ENET_HOST_TO_NET_32(data);
  3251. enet_peer_queue_outgoing_command(currentPeer, &command, NULL, 0, 0);
  3252. return currentPeer;
  3253. }
  3254. void enet_host_broadcast(ENetHost* host, enet_uint8 channelID, ENetPacket* packet) {
  3255. ENetPeer* currentPeer;
  3256. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3257. ++packet->referenceCount;
  3258. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3259. if (currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3260. continue;
  3261. enet_peer_send(currentPeer, channelID, packet);
  3262. }
  3263. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3264. --packet->referenceCount;
  3265. if (packet->referenceCount == 0)
  3266. enet_packet_destroy(packet);
  3267. }
  3268. void enet_host_broadcast_exclude(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer* excludedPeer) {
  3269. ENetPeer* currentPeer;
  3270. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3271. ++packet->referenceCount;
  3272. for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
  3273. if (currentPeer->state != ENET_PEER_STATE_CONNECTED || currentPeer == excludedPeer)
  3274. continue;
  3275. enet_peer_send(currentPeer, channelID, packet);
  3276. }
  3277. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3278. --packet->referenceCount;
  3279. if (packet->referenceCount == 0)
  3280. enet_packet_destroy(packet);
  3281. }
  3282. void enet_host_broadcast_selective(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer** peers, size_t length) {
  3283. ENetPeer* currentPeer;
  3284. size_t i;
  3285. if (host == NULL)
  3286. return;
  3287. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3288. ++packet->referenceCount;
  3289. for (i = 0; i < length; i++) {
  3290. currentPeer = peers[i];
  3291. if (currentPeer == NULL || currentPeer->state != ENET_PEER_STATE_CONNECTED)
  3292. continue;
  3293. enet_peer_send(currentPeer, channelID, packet);
  3294. }
  3295. if (packet->flags & ENET_PACKET_FLAG_INSTANT)
  3296. --packet->referenceCount;
  3297. if (packet->referenceCount == 0)
  3298. enet_packet_destroy(packet);
  3299. }
  3300. void enet_host_channel_limit(ENetHost* host, size_t channelLimit) {
  3301. if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
  3302. channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
  3303. else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
  3304. channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
  3305. host->channelLimit = channelLimit;
  3306. }
  3307. void enet_host_bandwidth_limit(ENetHost* host, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth) {
  3308. host->incomingBandwidth = incomingBandwidth;
  3309. host->outgoingBandwidth = outgoingBandwidth;
  3310. host->recalculateBandwidthLimits = 1;
  3311. }
  3312. void enet_host_bandwidth_throttle(ENetHost* host) {
  3313. enet_uint32 timeCurrent = enet_time_get();
  3314. enet_uint32 elapsedTime = timeCurrent - host->bandwidthThrottleEpoch;
  3315. enet_uint32 peersRemaining = (enet_uint32)host->connectedPeers;
  3316. enet_uint32 dataTotal = ~0;
  3317. enet_uint32 bandwidth = ~0;
  3318. enet_uint32 throttle = 0;
  3319. enet_uint32 bandwidthLimit = 0;
  3320. int needsAdjustment = host->bandwidthLimitedPeers > 0 ? 1 : 0;
  3321. ENetPeer* peer;
  3322. ENetProtocol command;
  3323. if (elapsedTime < ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
  3324. return;
  3325. if (host->outgoingBandwidth == 0 && host->incomingBandwidth == 0)
  3326. return;
  3327. host->bandwidthThrottleEpoch = timeCurrent;
  3328. if (peersRemaining == 0)
  3329. return;
  3330. if (host->outgoingBandwidth != 0) {
  3331. dataTotal = 0;
  3332. bandwidth = (host->outgoingBandwidth * elapsedTime) / 1000;
  3333. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3334. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3335. continue;
  3336. dataTotal += peer->outgoingDataTotal;
  3337. }
  3338. }
  3339. while (peersRemaining > 0 && needsAdjustment != 0) {
  3340. needsAdjustment = 0;
  3341. if (dataTotal <= bandwidth)
  3342. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3343. else
  3344. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3345. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3346. enet_uint32 peerBandwidth;
  3347. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidth == 0 || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3348. continue;
  3349. peerBandwidth = (peer->incomingBandwidth * elapsedTime) / 1000;
  3350. if ((throttle * peer->outgoingDataTotal) / ENET_PEER_PACKET_THROTTLE_SCALE <= peerBandwidth)
  3351. continue;
  3352. peer->packetThrottleLimit = (peerBandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / peer->outgoingDataTotal;
  3353. if (peer->packetThrottleLimit == 0)
  3354. peer->packetThrottleLimit = 1;
  3355. if (peer->packetThrottle > peer->packetThrottleLimit)
  3356. peer->packetThrottle = peer->packetThrottleLimit;
  3357. peer->outgoingBandwidthThrottleEpoch = timeCurrent;
  3358. peer->incomingDataTotal = 0;
  3359. peer->outgoingDataTotal = 0;
  3360. needsAdjustment = 1;
  3361. --peersRemaining;
  3362. bandwidth -= peerBandwidth;
  3363. dataTotal -= peerBandwidth;
  3364. }
  3365. }
  3366. if (peersRemaining > 0) {
  3367. if (dataTotal <= bandwidth)
  3368. throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
  3369. else
  3370. throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
  3371. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3372. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->outgoingBandwidthThrottleEpoch == timeCurrent)
  3373. continue;
  3374. peer->packetThrottleLimit = throttle;
  3375. if (peer->packetThrottle > peer->packetThrottleLimit)
  3376. peer->packetThrottle = peer->packetThrottleLimit;
  3377. peer->incomingDataTotal = 0;
  3378. peer->outgoingDataTotal = 0;
  3379. }
  3380. }
  3381. if (host->recalculateBandwidthLimits) {
  3382. host->recalculateBandwidthLimits = 0;
  3383. peersRemaining = (enet_uint32)host->connectedPeers;
  3384. bandwidth = host->incomingBandwidth;
  3385. needsAdjustment = 1;
  3386. if (bandwidth == 0) {
  3387. bandwidthLimit = 0;
  3388. }
  3389. else {
  3390. while (peersRemaining > 0 && needsAdjustment != 0) {
  3391. needsAdjustment = 0;
  3392. bandwidthLimit = bandwidth / peersRemaining;
  3393. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3394. if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3395. continue;
  3396. if (peer->outgoingBandwidth > 0 && peer->outgoingBandwidth >= bandwidthLimit)
  3397. continue;
  3398. peer->incomingBandwidthThrottleEpoch = timeCurrent;
  3399. needsAdjustment = 1;
  3400. --peersRemaining;
  3401. bandwidth -= peer->outgoingBandwidth;
  3402. }
  3403. }
  3404. }
  3405. for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) {
  3406. if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)
  3407. continue;
  3408. command.header.command = ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
  3409. command.header.channelID = 0xFF;
  3410. command.bandwidthLimit.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
  3411. if (peer->incomingBandwidthThrottleEpoch == timeCurrent)
  3412. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(peer->outgoingBandwidth);
  3413. else
  3414. command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(bandwidthLimit);
  3415. enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0);
  3416. }
  3417. }
  3418. }
  3419. /*
  3420. =======================================================================
  3421. Address
  3422. =======================================================================
  3423. */
  3424. int enet_address_set_host_ip(ENetAddress* address, const char* ip) {
  3425. int type = AF_INET6;
  3426. void* destination = &address->ipv6;
  3427. if (strchr(ip, ':') == NULL) {
  3428. type = AF_INET;
  3429. address->ipv4.ffff = 0xFFFF;
  3430. destination = &address->ipv4.ip;
  3431. }
  3432. if (!inet_pton(type, ip, destination)) {
  3433. ENET_LOG_ERROR("inet_pton failure");
  3434. return ENET_INET_PTON_FAILURE;
  3435. }
  3436. return 0;
  3437. }
  3438. int enet_address_set_host(ENetAddress* address, const char* name) {
  3439. struct addrinfo hints, * resultList = NULL, * result = NULL;
  3440. memset(&hints, 0, sizeof(hints));
  3441. hints.ai_family = AF_UNSPEC;
  3442. if (getaddrinfo(name, NULL, &hints, &resultList) != 0) {
  3443. ENET_LOG_ERROR("Could not getaddrinfo");
  3444. return ENET_GETADDRINFO_FAILURE;
  3445. }
  3446. for (result = resultList; result != NULL; result = result->ai_next) {
  3447. if (result->ai_addr != NULL && result->ai_addrlen >= sizeof(struct sockaddr_in)) {
  3448. if (result->ai_family == AF_INET) {
  3449. struct sockaddr_in* sin = (struct sockaddr_in*)result->ai_addr;
  3450. memset(address, 0, sizeof(address->ipv4.zeros));
  3451. address->ipv4.ffff = 0xFFFF;
  3452. address->ipv4.ip.s_addr = sin->sin_addr.s_addr;
  3453. freeaddrinfo(resultList);
  3454. return 0;
  3455. }
  3456. else if (result->ai_family == AF_INET6) {
  3457. struct sockaddr_in6* sin = (struct sockaddr_in6*)result->ai_addr;
  3458. address->ipv6 = sin->sin6_addr;
  3459. freeaddrinfo(resultList);
  3460. return 0;
  3461. }
  3462. }
  3463. }
  3464. if (resultList != NULL)
  3465. freeaddrinfo(resultList);
  3466. return enet_address_set_host_ip(address, name);
  3467. }
  3468. int enet_address_get_host_ip(const ENetAddress* address, char* ip, size_t ipLength) {
  3469. if (inet_ntop(AF_INET6, &address->ipv6, ip, ipLength) == NULL) {
  3470. ENET_LOG_ERROR("inet_ntop failure (was NULL)");
  3471. return ENET_INET_PTON_FAILURE;
  3472. }
  3473. if (enet_array_is_zeroed(address->ipv4.zeros, sizeof(address->ipv4.zeros)) == 0 && address->ipv4.ffff == 0xFFFF)
  3474. enet_string_copy(ip, ip + 7, ipLength);
  3475. return 0;
  3476. }
  3477. int enet_address_get_host(const ENetAddress* address, char* name, size_t nameLength) {
  3478. struct sockaddr_in6 sin;
  3479. int err;
  3480. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3481. sin.sin6_family = AF_INET6;
  3482. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3483. sin.sin6_addr = address->ipv6;
  3484. err = getnameinfo((struct sockaddr*) & sin, sizeof(sin), name, nameLength, NULL, 0, NI_NAMEREQD);
  3485. if (!err) {
  3486. if (name != NULL && nameLength > 0 && !memchr(name, '\0', nameLength)) {
  3487. ENET_LOG_ERROR("something funky going on here");
  3488. return ENET_HOST_FUNKYSTUFF;
  3489. }
  3490. return ENET_HOST_RANDOMERROR;
  3491. }
  3492. if (err != EAI_NONAME) {
  3493. ENET_LOG_ERROR("some error occurred: %i", err);
  3494. return -1;
  3495. }
  3496. return enet_address_get_host_ip(address, name, nameLength);
  3497. }
  3498. /*
  3499. =======================================================================
  3500. Platform-specific (Unix)
  3501. =======================================================================
  3502. */
  3503. #ifndef _WIN32
  3504. int enet_initialize(void) {
  3505. return 0;
  3506. }
  3507. void enet_deinitialize(void) { }
  3508. enet_uint64 enet_host_random_seed(void) {
  3509. struct timeval timeVal;
  3510. gettimeofday(&timeVal, NULL);
  3511. return (timeVal.tv_sec * 1000) ^ (timeVal.tv_usec / 1000);
  3512. }
  3513. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3514. struct sockaddr_in6 sin;
  3515. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3516. sin.sin6_family = AF_INET6;
  3517. if (address != NULL) {
  3518. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3519. sin.sin6_addr = address->ipv6;
  3520. }
  3521. else {
  3522. sin.sin6_port = 0;
  3523. sin.sin6_addr = ENET_HOST_ANY;
  3524. }
  3525. return bind(socket, (struct sockaddr*) & sin, sizeof(struct sockaddr_in6));
  3526. }
  3527. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3528. struct sockaddr_in6 sin;
  3529. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3530. if (getsockname(socket, (struct sockaddr*) & sin, &sinLength) == -1) {
  3531. ENET_LOG_ERROR("getsockname failure");
  3532. return ENET_GETSOCKINFO_FAILURE;
  3533. }
  3534. address->ipv6 = sin.sin6_addr;
  3535. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3536. return 0;
  3537. }
  3538. int enet_socket_listen(ENetSocket socket, int backlog) {
  3539. return listen(socket, backlog < 0 ? SOMAXCONN : backlog);
  3540. }
  3541. ENetSocket enet_socket_create(ENetSocketType type) {
  3542. int socketType = (type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM);
  3543. #ifdef SOCK_CLOEXEC
  3544. socketType |= SOCK_CLOEXEC;
  3545. #endif
  3546. return socket(PF_INET6, socketType, 0);
  3547. }
  3548. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3549. int result = -1;
  3550. switch (option) {
  3551. case ENET_SOCKOPT_NONBLOCK:
  3552. result = fcntl(socket, F_SETFL, (value ? O_NONBLOCK : 0) | (fcntl(socket, F_GETFL) & ~O_NONBLOCK));
  3553. break;
  3554. case ENET_SOCKOPT_BROADCAST:
  3555. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)& value, sizeof(int));
  3556. break;
  3557. case ENET_SOCKOPT_REUSEADDR:
  3558. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)& value, sizeof(int));
  3559. break;
  3560. case ENET_SOCKOPT_RCVBUF:
  3561. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)& value, sizeof(int));
  3562. break;
  3563. case ENET_SOCKOPT_SNDBUF:
  3564. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)& value, sizeof(int));
  3565. break;
  3566. case ENET_SOCKOPT_RCVTIMEO: {
  3567. struct timeval timeVal;
  3568. timeVal.tv_sec = value / 1000;
  3569. timeVal.tv_usec = (value % 1000) * 1000;
  3570. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)& timeVal, sizeof(struct timeval));
  3571. break;
  3572. }
  3573. case ENET_SOCKOPT_SNDTIMEO: {
  3574. struct timeval timeVal;
  3575. timeVal.tv_sec = value / 1000;
  3576. timeVal.tv_usec = (value % 1000) * 1000;
  3577. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)& timeVal, sizeof(struct timeval));
  3578. break;
  3579. }
  3580. case ENET_SOCKOPT_NODELAY:
  3581. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)& value, sizeof(int));
  3582. break;
  3583. case ENET_SOCKOPT_IPV6_V6ONLY:
  3584. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)& value, sizeof(int));
  3585. break;
  3586. default:
  3587. break;
  3588. }
  3589. return result == -1 ? -1 : 0;
  3590. }
  3591. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3592. int result = -1;
  3593. socklen_t len;
  3594. switch (option) {
  3595. case ENET_SOCKOPT_ERROR:
  3596. len = sizeof(int);
  3597. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, value, &len);
  3598. break;
  3599. default:
  3600. break;
  3601. }
  3602. return result == -1 ? -1 : 0;
  3603. }
  3604. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3605. int result = -1;
  3606. struct sockaddr_in6 sin;
  3607. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3608. sin.sin6_family = AF_INET6;
  3609. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3610. sin.sin6_addr = address->ipv6;
  3611. result = connect(socket, (struct sockaddr*) & sin, sizeof(struct sockaddr_in6));
  3612. if (result == -1 && errno == EINPROGRESS)
  3613. return 0;
  3614. return result;
  3615. }
  3616. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3617. int result = -1;
  3618. struct sockaddr_in6 sin;
  3619. socklen_t sinLength = sizeof(struct sockaddr_in6);
  3620. result = accept(socket, address != NULL ? (struct sockaddr*) & sin : NULL, address != NULL ? &sinLength : NULL);
  3621. if (result == -1)
  3622. return ENET_SOCKET_NULL;
  3623. if (address != NULL) {
  3624. address->ipv6 = sin.sin6_addr;
  3625. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3626. }
  3627. return result;
  3628. }
  3629. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3630. return shutdown(socket, (int)how);
  3631. }
  3632. void enet_socket_destroy(ENetSocket socket) {
  3633. if (socket != ENET_SOCKET_NULL)
  3634. close(socket);
  3635. }
  3636. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3637. struct msghdr msgHdr;
  3638. struct sockaddr_in6 sin;
  3639. int sentLength;
  3640. memset(&msgHdr, 0, sizeof(struct msghdr));
  3641. if (address != NULL) {
  3642. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3643. sin.sin6_family = AF_INET6;
  3644. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3645. sin.sin6_addr = address->ipv6;
  3646. msgHdr.msg_name = &sin;
  3647. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3648. }
  3649. msgHdr.msg_iov = (struct iovec*)buffers;
  3650. msgHdr.msg_iovlen = bufferCount;
  3651. sentLength = sendmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3652. if (sentLength == -1) {
  3653. if (errno == EWOULDBLOCK)
  3654. return 0;
  3655. ENET_LOG_ERROR("sentLength weirdness");
  3656. return ENET_SOCKET_SEND_WEIRDNESS;
  3657. }
  3658. return sentLength;
  3659. }
  3660. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3661. struct msghdr msgHdr;
  3662. struct sockaddr_in6 sin;
  3663. int recvLength;
  3664. memset(&msgHdr, 0, sizeof(struct msghdr));
  3665. if (address != NULL) {
  3666. msgHdr.msg_name = &sin;
  3667. msgHdr.msg_namelen = sizeof(struct sockaddr_in6);
  3668. }
  3669. msgHdr.msg_iov = (struct iovec*)buffers;
  3670. msgHdr.msg_iovlen = bufferCount;
  3671. recvLength = recvmsg(socket, &msgHdr, MSG_NOSIGNAL);
  3672. if (recvLength == -1) {
  3673. if (errno == EWOULDBLOCK)
  3674. return 0;
  3675. ENET_LOG_ERROR("recvLength weirdness");
  3676. return ENET_SOCKET_RECEIVE_WEIRDNESS;
  3677. }
  3678. if (msgHdr.msg_flags & MSG_TRUNC) {
  3679. ENET_LOG_ERROR("message was truncated...");
  3680. return ENET_SOCKET_MSGTRUNCATED;
  3681. }
  3682. if (address != NULL) {
  3683. address->ipv6 = sin.sin6_addr;
  3684. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3685. }
  3686. return recvLength;
  3687. }
  3688. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3689. struct timeval timeVal;
  3690. timeVal.tv_sec = timeout / 1000;
  3691. timeVal.tv_usec = (timeout % 1000) * 1000;
  3692. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3693. }
  3694. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3695. struct pollfd pollSocket;
  3696. int pollCount;
  3697. pollSocket.fd = socket;
  3698. pollSocket.events = 0;
  3699. if (*condition & ENET_SOCKET_WAIT_SEND)
  3700. pollSocket.events |= POLLOUT;
  3701. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3702. pollSocket.events |= POLLIN;
  3703. pollCount = poll(&pollSocket, 1, timeout);
  3704. if (pollCount < 0) {
  3705. if (errno == EINTR && *condition & ENET_SOCKET_WAIT_INTERRUPT) {
  3706. *condition = ENET_SOCKET_WAIT_INTERRUPT;
  3707. return 0;
  3708. }
  3709. ENET_LOG_ERROR("pollCount < 0: %i", pollCount);
  3710. return ENET_SOCKET_WAITPOLL_NEGATIVE;
  3711. }
  3712. *condition = ENET_SOCKET_WAIT_NONE;
  3713. if (pollCount == 0)
  3714. return 0;
  3715. if (pollSocket.revents & POLLOUT)
  3716. * condition |= ENET_SOCKET_WAIT_SEND;
  3717. if (pollSocket.revents & POLLIN)
  3718. * condition |= ENET_SOCKET_WAIT_RECEIVE;
  3719. return 0;
  3720. }
  3721. #endif
  3722. /*
  3723. =======================================================================
  3724. Platform-specific (Windows)
  3725. =======================================================================
  3726. */
  3727. #ifdef _WIN32
  3728. int enet_initialize(void) {
  3729. WORD versionRequested = MAKEWORD(2, 2);
  3730. WSADATA wsaData;
  3731. if (WSAStartup(versionRequested, &wsaData)) {
  3732. ENET_LOG_ERROR("WSAStartup failure");
  3733. return ENET_SOCKET_WSAFAILED;
  3734. }
  3735. if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
  3736. ENET_LOG_ERROR("Winsock version mismatch");
  3737. WSACleanup();
  3738. return ENET_SOCKET_WINSOCKMISMATCH;
  3739. }
  3740. timeBeginPeriod(1);
  3741. ENET_LOG_TRACE("Initialization");
  3742. return 0;
  3743. }
  3744. void enet_deinitialize(void) {
  3745. timeEndPeriod(1);
  3746. WSACleanup();
  3747. ENET_LOG_TRACE("Deinitialization");
  3748. }
  3749. enet_uint64 enet_host_random_seed(void) {
  3750. return (enet_uint64)timeGetTime();
  3751. }
  3752. int enet_socket_bind(ENetSocket socket, const ENetAddress* address) {
  3753. struct sockaddr_in6 sin;
  3754. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3755. sin.sin6_family = AF_INET6;
  3756. if (address != NULL) {
  3757. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3758. sin.sin6_addr = address->ipv6;
  3759. }
  3760. else {
  3761. sin.sin6_port = 0;
  3762. sin.sin6_addr = in6addr_any;
  3763. }
  3764. return bind(socket, (struct sockaddr*) & sin, sizeof(struct sockaddr_in6)) == SOCKET_ERROR ? -1 : 0;
  3765. }
  3766. int enet_socket_get_address(ENetSocket socket, ENetAddress* address) {
  3767. struct sockaddr_in6 sin;
  3768. int sinLength = sizeof(struct sockaddr_in6);
  3769. if (getsockname(socket, (struct sockaddr*) & sin, &sinLength) == -1) {
  3770. ENET_LOG_ERROR("getsockname failure");
  3771. return ENET_SOCKET_GETSOCKNAME_FAILURE;
  3772. }
  3773. address->ipv6 = sin.sin6_addr;
  3774. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3775. return 0;
  3776. }
  3777. int enet_socket_listen(ENetSocket socket, int backlog) {
  3778. return listen(socket, backlog < 0 ? SOMAXCONN : backlog) == SOCKET_ERROR ? -1 : 0;
  3779. }
  3780. ENetSocket enet_socket_create(ENetSocketType type) {
  3781. return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
  3782. }
  3783. int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
  3784. int result = SOCKET_ERROR;
  3785. switch (option) {
  3786. case ENET_SOCKOPT_NONBLOCK: {
  3787. u_long nonBlocking = (u_long)value;
  3788. result = ioctlsocket(socket, FIONBIO, &nonBlocking);
  3789. break;
  3790. }
  3791. case ENET_SOCKOPT_BROADCAST:
  3792. result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)& value, sizeof(int));
  3793. break;
  3794. case ENET_SOCKOPT_REUSEADDR:
  3795. result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)& value, sizeof(int));
  3796. break;
  3797. case ENET_SOCKOPT_RCVBUF:
  3798. result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)& value, sizeof(int));
  3799. break;
  3800. case ENET_SOCKOPT_SNDBUF:
  3801. result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)& value, sizeof(int));
  3802. break;
  3803. case ENET_SOCKOPT_RCVTIMEO:
  3804. result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)& value, sizeof(int));
  3805. break;
  3806. case ENET_SOCKOPT_SNDTIMEO:
  3807. result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)& value, sizeof(int));
  3808. break;
  3809. case ENET_SOCKOPT_NODELAY:
  3810. result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)& value, sizeof(int));
  3811. break;
  3812. case ENET_SOCKOPT_IPV6_V6ONLY:
  3813. result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)& value, sizeof(int));
  3814. break;
  3815. default:
  3816. break;
  3817. }
  3818. return result == SOCKET_ERROR ? -1 : 0;
  3819. }
  3820. int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) {
  3821. int result = SOCKET_ERROR, len;
  3822. switch (option) {
  3823. case ENET_SOCKOPT_ERROR:
  3824. len = sizeof(int);
  3825. result = getsockopt(socket, SOL_SOCKET, SO_ERROR, (char*)value, &len);
  3826. break;
  3827. default:
  3828. break;
  3829. }
  3830. return result == SOCKET_ERROR ? -1 : 0;
  3831. }
  3832. int enet_socket_connect(ENetSocket socket, const ENetAddress* address) {
  3833. int result = -1;
  3834. struct sockaddr_in6 sin;
  3835. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3836. sin.sin6_family = AF_INET6;
  3837. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3838. sin.sin6_addr = address->ipv6;
  3839. result = connect(socket, (struct sockaddr*) & sin, sizeof(struct sockaddr_in6));
  3840. if (result == SOCKET_ERROR && WSAGetLastError() != WSAEWOULDBLOCK) {
  3841. int winSockWhat = WSAGetLastError();
  3842. ENET_LOG_ERROR("Socket connect failure, return code: %i, WSAGetLastError: %i", result, winSockWhat);
  3843. return ENET_SOCKET_WSAFAILED;
  3844. }
  3845. return 0;
  3846. }
  3847. ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) {
  3848. SOCKET result;
  3849. struct sockaddr_in6 sin;
  3850. int sinLength = sizeof(struct sockaddr_in6);
  3851. result = accept(socket, address != NULL ? (struct sockaddr*) & sin : NULL, address != NULL ? &sinLength : NULL);
  3852. if (result == INVALID_SOCKET) {
  3853. ENET_LOG_ERROR("Tried to accept from an invalid socket");
  3854. return ENET_SOCKET_NULL;
  3855. }
  3856. if (address != NULL) {
  3857. address->ipv6 = sin.sin6_addr;
  3858. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3859. }
  3860. return result;
  3861. }
  3862. int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
  3863. return shutdown(socket, (int)how) == SOCKET_ERROR ? -1 : 0;
  3864. }
  3865. void enet_socket_destroy(ENetSocket socket) {
  3866. if (socket != INVALID_SOCKET)
  3867. closesocket(socket);
  3868. }
  3869. int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) {
  3870. struct sockaddr_in6 sin;
  3871. DWORD sentLength;
  3872. if (address != NULL) {
  3873. memset(&sin, 0, sizeof(struct sockaddr_in6));
  3874. sin.sin6_family = AF_INET6;
  3875. sin.sin6_port = ENET_HOST_TO_NET_16(address->port);
  3876. sin.sin6_addr = address->ipv6;
  3877. }
  3878. 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)
  3879. return (WSAGetLastError() == WSAEWOULDBLOCK) ? 0 : -1;
  3880. return (int)sentLength;
  3881. }
  3882. int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) {
  3883. INT sinLength = sizeof(struct sockaddr_in6);
  3884. DWORD flags = 0, recvLength;
  3885. struct sockaddr_in6 sin;
  3886. if (WSARecvFrom(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &recvLength, &flags, address != NULL ? (struct sockaddr*) & sin : NULL, address != NULL ? &sinLength : NULL, NULL, NULL) == SOCKET_ERROR) {
  3887. int retCode = WSAGetLastError();
  3888. switch (retCode) {
  3889. case WSAEWOULDBLOCK:
  3890. case WSAECONNRESET:
  3891. return 0;
  3892. }
  3893. ENET_LOG_ERROR("Socket receive failure, WSA return code %d", retCode);
  3894. return ENET_SOCKET_WSAFAILED;
  3895. }
  3896. if (flags & MSG_PARTIAL) {
  3897. ENET_LOG_ERROR("Socket receive message was partial??");
  3898. return ENET_SOCKET_MSGPARTIAL;
  3899. }
  3900. if (address != NULL) {
  3901. address->ipv6 = sin.sin6_addr;
  3902. address->port = ENET_NET_TO_HOST_16(sin.sin6_port);
  3903. }
  3904. return (int)recvLength;
  3905. }
  3906. int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) {
  3907. struct timeval timeVal;
  3908. timeVal.tv_sec = timeout / 1000;
  3909. timeVal.tv_usec = (timeout % 1000) * 1000;
  3910. return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal);
  3911. }
  3912. int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) {
  3913. fd_set readSet, writeSet;
  3914. struct timeval timeVal;
  3915. int selectCount;
  3916. timeVal.tv_sec = timeout / 1000;
  3917. timeVal.tv_usec = (timeout % 1000) * 1000;
  3918. FD_ZERO(&readSet);
  3919. FD_ZERO(&writeSet);
  3920. if (*condition & ENET_SOCKET_WAIT_SEND)
  3921. FD_SET(socket, &writeSet);
  3922. if (*condition & ENET_SOCKET_WAIT_RECEIVE)
  3923. FD_SET(socket, &readSet);
  3924. selectCount = select(socket + 1, &readSet, &writeSet, NULL, &timeVal);
  3925. if (selectCount < 0) {
  3926. ENET_LOG_ERROR("selectCount < 0; was %d", selectCount);
  3927. return ENET_SOCKET_WAITPOLL_NEGATIVE;
  3928. }
  3929. *condition = ENET_SOCKET_WAIT_NONE;
  3930. if (selectCount == 0)
  3931. return 0;
  3932. if (FD_ISSET(socket, &writeSet))
  3933. * condition |= ENET_SOCKET_WAIT_SEND;
  3934. if (FD_ISSET(socket, &readSet))
  3935. * condition |= ENET_SOCKET_WAIT_RECEIVE;
  3936. return 0;
  3937. }
  3938. #endif
  3939. /*
  3940. =======================================================================
  3941. Extended functionality
  3942. =======================================================================
  3943. */
  3944. void* enet_packet_get_data(const ENetPacket* packet) {
  3945. return (void*)packet->data;
  3946. }
  3947. int enet_packet_get_length(const ENetPacket* packet) {
  3948. return packet->dataLength;
  3949. }
  3950. void enet_packet_set_free_callback(ENetPacket* packet, const void* callback) {
  3951. packet->freeCallback = (ENetPacketFreeCallback)callback;
  3952. }
  3953. int enet_packet_check_references(const ENetPacket* packet) {
  3954. return (int)packet->referenceCount;
  3955. }
  3956. void enet_packet_dispose(ENetPacket* packet) {
  3957. if (packet->referenceCount == 0)
  3958. enet_packet_destroy(packet);
  3959. }
  3960. enet_uint32 enet_host_get_peers_count(const ENetHost* host) {
  3961. return host->connectedPeers;
  3962. }
  3963. enet_uint32 enet_host_get_packets_sent(const ENetHost* host) {
  3964. return host->totalSentPackets;
  3965. }
  3966. enet_uint32 enet_host_get_packets_received(const ENetHost* host) {
  3967. return host->totalReceivedPackets;
  3968. }
  3969. enet_uint32 enet_host_get_bytes_sent(const ENetHost* host) {
  3970. return host->totalSentData;
  3971. }
  3972. enet_uint32 enet_host_get_bytes_received(const ENetHost* host) {
  3973. return host->totalReceivedData;
  3974. }
  3975. enet_uint32 enet_peer_get_id(const ENetPeer* peer) {
  3976. return peer->incomingPeerID;
  3977. }
  3978. int enet_peer_get_ip(const ENetPeer* peer, char* ip, size_t ipLength) {
  3979. return enet_address_get_host_ip(&peer->address, ip, ipLength);
  3980. }
  3981. enet_uint16 enet_peer_get_port(const ENetPeer* peer) {
  3982. return peer->address.port;
  3983. }
  3984. enet_uint32 enet_peer_get_mtu(const ENetPeer* peer) {
  3985. return peer->mtu;
  3986. }
  3987. ENetPeerState enet_peer_get_state(const ENetPeer* peer) {
  3988. return peer->state;
  3989. }
  3990. enet_uint32 enet_peer_get_rtt(const ENetPeer* peer) {
  3991. return peer->smoothedRoundTripTime;
  3992. }
  3993. enet_uint32 enet_peer_get_lastsendtime(const ENetPeer* peer) {
  3994. return peer->lastSendTime;
  3995. }
  3996. enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer* peer) {
  3997. return peer->lastReceiveTime;
  3998. }
  3999. enet_uint64 enet_peer_get_packets_sent(const ENetPeer* peer) {
  4000. return peer->totalPacketsSent;
  4001. }
  4002. enet_uint64 enet_peer_get_packets_lost(const ENetPeer* peer) {
  4003. return peer->totalPacketsLost;
  4004. }
  4005. enet_uint64 enet_peer_get_bytes_sent(const ENetPeer* peer) {
  4006. return peer->totalDataSent;
  4007. }
  4008. enet_uint64 enet_peer_get_bytes_received(const ENetPeer* peer) {
  4009. return peer->totalDataReceived;
  4010. }
  4011. void* enet_peer_get_data(const ENetPeer* peer) {
  4012. return (void*)peer->data;
  4013. }
  4014. void enet_peer_set_data(ENetPeer* peer, const void* data) {
  4015. peer->data = (enet_uint32*)data;
  4016. }
  4017. #ifdef __cplusplus
  4018. }
  4019. #endif
  4020. #endif
  4021. #endif