| 1 | /* |
1 | /* |
| 2 | CrossFire, A Multiplayer game for X-windows |
2 | * CrossFire, A Multiplayer game for X-windows |
| 3 | |
3 | * |
|
|
4 | * Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team |
| 4 | Copyright (C) 1992 Frank Tore Johansen |
5 | * Copyright (C) 1992 Frank Tore Johansen |
| 5 | |
6 | * |
| 6 | This program is free software; you can redistribute it and/or modify |
7 | * This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
8 | * it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
9 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
10 | * (at your option) any later version. |
| 10 | |
11 | * |
| 11 | This program is distributed in the hope that it will be useful, |
12 | * This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
15 | * GNU General Public License for more details. |
| 15 | |
16 | * |
| 16 | You should have received a copy of the GNU General Public License |
17 | * You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
18 | * along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 19 | |
20 | * |
| 20 | The author can be reached via e-mail to mark@pyramid.com |
21 | * The author can be reached via e-mail to mark@pyramid.com |
| 21 | */ |
22 | */ |
| 22 | |
23 | |
| 23 | /** |
24 | /** |
| 24 | * \file |
25 | * \file |
| 25 | * Low-level socket-related functions. |
26 | * Low-level socket-related functions. |
| 26 | * |
27 | * |
| 27 | * \date 2003-12-02 |
28 | * \date 2003-12-02 |
| … | |
… | |
| 40 | |
41 | |
| 41 | #ifdef __linux__ |
42 | #ifdef __linux__ |
| 42 | # include <sys/types.h> |
43 | # include <sys/types.h> |
| 43 | # include <sys/socket.h> |
44 | # include <sys/socket.h> |
| 44 | # include <netinet/in.h> |
45 | # include <netinet/in.h> |
| 45 | # define TCP_HZ 1000 // sorry... |
|
|
| 46 | # include <netinet/tcp.h> |
46 | # include <netinet/tcp.h> |
| 47 | #endif |
47 | #endif |
| 48 | |
48 | |
| 49 | // use a really low timeout, as it doesn't cost any bandwidth, and you can |
49 | // use a really low timeout, as it doesn't cost any bandwidth, and you can |
| 50 | // easily die in 20 seconds... |
50 | // easily die in 20 seconds... |
| 51 | #define SOCKET_TIMEOUT1 10 |
51 | #define SOCKET_TIMEOUT1 10 * 1000 |
| 52 | #define SOCKET_TIMEOUT2 20 |
52 | #define SOCKET_TIMEOUT2 20 * 1000 |
| 53 | |
53 | |
| 54 | void |
54 | void |
| 55 | client::flush () |
55 | client::flush () |
| 56 | { |
56 | { |
|
|
57 | if (destroyed ()) |
|
|
58 | return; |
|
|
59 | |
| 57 | #ifdef __linux__ |
60 | #ifdef __linux__ |
| 58 | // check time of last ack, and, if too old, kill connection |
61 | // check time of last ack, and, if too old, kill connection |
| 59 | struct tcp_info tcpi; |
62 | struct tcp_info tcpi; |
| 60 | socklen_t len = sizeof (tcpi); |
63 | socklen_t len = sizeof (tcpi); |
| 61 | |
64 | |
| … | |
… | |
| 64 | unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; |
67 | unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; |
| 65 | |
68 | |
| 66 | rtt = tcpi.tcpi_rtt; |
69 | rtt = tcpi.tcpi_rtt; |
| 67 | rttvar = tcpi.tcpi_rttvar; |
70 | rttvar = tcpi.tcpi_rttvar; |
| 68 | |
71 | |
| 69 | if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s |
72 | if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s |
| 70 | && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s |
73 | && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s |
| 71 | { |
74 | { |
| 72 | LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
75 | LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
| 73 | (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); |
76 | (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); |
| 74 | destroy (); |
77 | destroy (); |
| 75 | } |
78 | } |
| … | |
… | |
| 183 | |
186 | |
| 184 | /** |
187 | /** |
| 185 | * Dispatch table for the server. |
188 | * Dispatch table for the server. |
| 186 | */ |
189 | */ |
| 187 | static struct packet_type packets[] = { |
190 | static struct packet_type packets[] = { |
| 188 | {"ncom", PC(NewPlayerCmd) PF_PLAYING }, |
191 | {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 }, |
| 189 | {"command", PC(PlayerCmd) PF_PLAYING }, |
192 | {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 }, |
| 190 | |
193 | |
| 191 | {"examine", PC(ExamineCmd) PF_PLAYING }, |
194 | {"examine", PC(ExamineCmd) PF_PLAYING }, |
| 192 | {"apply", PC(ApplyCmd) PF_PLAYING }, |
195 | {"apply", PC(ApplyCmd) PF_PLAYING }, |
| 193 | {"reply", PC(ReplyCmd) PF_IMMEDIATE }, |
|
|
| 194 | {"lookat", PC(LookAt) PF_PLAYING }, |
196 | {"lookat", PC(LookAt) PF_PLAYING }, |
| 195 | {"lock", PC(LockItem) PF_PLAYING }, |
197 | {"lock", PC(LockItem) PF_PLAYING }, |
| 196 | {"mark", PC(MarkItem) PF_PLAYING }, |
198 | {"mark", PC(MarkItem) PF_PLAYING }, |
| 197 | {"move", PC(MoveCmd) PF_PLAYING }, |
199 | {"move", PC(MoveCmd) PF_PLAYING }, |
| 198 | {"exti", PC(ExtCmd) PF_IMMEDIATE }, /* CF+ */ |
|
|
| 199 | {"ext", PC(ExtCmd) 0 }, /* CF+ */ |
200 | {"ext", PC(ExtCmd) 0 }, /* CF+ */ |
| 200 | {"mapredraw", PC(MapRedrawCmd) PF_IMMEDIATE }, /* Added: phil */ |
201 | {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ |
| 201 | {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ |
202 | {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ |
| 202 | |
203 | |
|
|
204 | {"reply", SC(ReplyCmd) 0 }, |
|
|
205 | {"exti", SC(ExtiCmd) 0 }, /* CF+ */ |
| 203 | {"addme", SC(AddMeCmd) PF_IMMEDIATE }, |
206 | {"addme", SC(AddMeCmd) 0 }, |
| 204 | {"askface", SC(SendFaceCmd) PF_IMMEDIATE }, /* Added: phil */ |
207 | {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ |
| 205 | {"requestinfo", SC(RequestInfo) PF_IMMEDIATE }, |
208 | {"requestinfo", SC(RequestInfo) 0 }, |
| 206 | {"setfacemode", SC(SetFaceMode) PF_IMMEDIATE }, |
209 | {"setfacemode", SC(SetFaceMode) 0 }, |
| 207 | {"setsound", SC(SetSound) PF_IMMEDIATE }, |
210 | {"setsound", SC(SetSound) 0 }, |
| 208 | {"setup", SC(SetUp) PF_IMMEDIATE }, |
211 | {"setup", SC(SetUp) 0 }, |
| 209 | {"version", SC(VersionCmd) PF_IMMEDIATE }, |
212 | {"version", SC(VersionCmd) 0 }, |
| 210 | {"toggleextendedinfos", SC(ToggleExtendedInfos) PF_IMMEDIATE }, /*Added: tchize */ |
213 | {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */ |
| 211 | {"toggleextendedtext", SC(ToggleExtendedText) PF_IMMEDIATE }, /*Added: tchize */ |
214 | {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */ |
| 212 | {"asksmooth", SC(AskSmooth) PF_IMMEDIATE }, /*Added: tchize (smoothing technologies) */ |
215 | {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */ |
| 213 | }; |
216 | }; |
| 214 | |
217 | |
| 215 | bool |
218 | bool |
| 216 | client::may_execute (const packet_type *pkt) const |
219 | client::may_execute (const packet_type *pkt) const |
| 217 | { |
220 | { |
| 218 | return (!(pkt->flags & PF_PLAYER) || pl) |
221 | return (!(pkt->flags & PF_PLAYER) || pl) |
| 219 | && (!(pkt->flags & PF_PLAYING) || (pl && pl->state == ST_PLAYING)); |
222 | && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); |
|
|
223 | } |
|
|
224 | |
|
|
225 | // HACK: some commands currently should be executed |
|
|
226 | // even when the player is frozen. this hack detects |
|
|
227 | // those commands. it should be folded into may_execute, |
|
|
228 | // but kept seperate to emphasise the hack aspect, i.e. |
|
|
229 | // do it better, then remove. |
|
|
230 | static bool |
|
|
231 | always_immediate (const client *ns, const packet_type *pkt, const char *data, int len) |
|
|
232 | { |
|
|
233 | if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6))) |
|
|
234 | return false; |
|
|
235 | |
|
|
236 | if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map) |
|
|
237 | return false; |
|
|
238 | |
|
|
239 | if (pkt->flags & PF_COMMAND6) |
|
|
240 | { |
|
|
241 | data += 6; |
|
|
242 | len -= 6; |
|
|
243 | } |
|
|
244 | |
|
|
245 | if (len > 4 && !strncmp (data, "say " , 4)) |
|
|
246 | return true; |
|
|
247 | if (len > 5 && !strncmp (data, "chat ", 5)) |
|
|
248 | return true; |
|
|
249 | |
|
|
250 | return false; |
| 220 | } |
251 | } |
| 221 | |
252 | |
| 222 | void |
253 | void |
| 223 | client::execute (const packet_type *pkt, char *data, int datalen) |
254 | client::execute (const packet_type *pkt, char *data, int datalen) |
| 224 | { |
255 | { |
| 225 | if (may_execute (pkt)) |
256 | if (may_execute (pkt) || always_immediate (this, pkt, data, datalen)) |
| 226 | { |
257 | { |
| 227 | //TODO: only one format |
258 | //TODO: only one format |
| 228 | if (pkt->flags & PF_PLAYER) |
259 | if (pkt->flags & PF_PLAYER) |
| 229 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
260 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
| 230 | else |
261 | else |
| … | |
… | |
| 271 | } |
302 | } |
| 272 | |
303 | |
| 273 | for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) |
304 | for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) |
| 274 | if (!strcmp ((char *)inbuf + 2, pkt->name)) |
305 | if (!strcmp ((char *)inbuf + 2, pkt->name)) |
| 275 | { |
306 | { |
| 276 | if (pkt->flags & PF_IMMEDIATE) |
307 | if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen)) |
|
|
308 | queue_command (pkt, data, datalen); |
|
|
309 | else |
| 277 | execute (pkt, data, datalen); |
310 | execute (pkt, data, datalen); |
| 278 | else |
|
|
| 279 | queue_command (pkt, data, datalen); |
|
|
| 280 | |
311 | |
| 281 | goto next_packet; |
312 | goto next_packet; |
| 282 | } |
313 | } |
| 283 | |
314 | |
| 284 | /* If we get here, we didn't find a valid command. Logging |
315 | // If we get here, we didn't find a valid command. |
| 285 | * this might be questionable, because a broken client/malicious |
|
|
| 286 | * user could certainly send a whole bunch of invalid commands. |
|
|
| 287 | */ |
|
|
| 288 | send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); |
316 | send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); |
| 289 | next_packet: |
317 | next_packet: |
| 290 | skip_packet (pkt_len); |
318 | skip_packet (pkt_len); |
| 291 | |
319 | |
| 292 | // input buffer has space again |
320 | // input buffer has space again |
| … | |
… | |
| 298 | // callback called when socket is either readable or writable |
326 | // callback called when socket is either readable or writable |
| 299 | void |
327 | void |
| 300 | client::socket_cb (iow &w, int got) |
328 | client::socket_cb (iow &w, int got) |
| 301 | { |
329 | { |
| 302 | //TODO remove when we have better socket cleanup logic |
330 | //TODO remove when we have better socket cleanup logic |
| 303 | if (status == Ns_Dead) |
331 | if (destroyed ()) |
| 304 | { |
332 | { |
| 305 | socket_ev.poll (0); |
333 | socket_ev.poll (0); |
| 306 | return; |
334 | return; |
| 307 | } |
335 | } |
| 308 | |
336 | |
| … | |
… | |
| 359 | |
387 | |
| 360 | // called whenever we have additional commands to process |
388 | // called whenever we have additional commands to process |
| 361 | void |
389 | void |
| 362 | client::cmd_cb (iw &w) |
390 | client::cmd_cb (iw &w) |
| 363 | { |
391 | { |
| 364 | if (handle_packet () || handle_command ()) |
392 | if (handle_packet ()) |
| 365 | w.start (); |
393 | w.start (); |
| 366 | else |
394 | else |
| 367 | flush (); |
395 | flush (); |
| 368 | } |
396 | } |
| 369 | |
397 | |
| … | |
… | |
| 381 | */ |
409 | */ |
| 382 | void |
410 | void |
| 383 | client::send (void *buf_, int len) |
411 | client::send (void *buf_, int len) |
| 384 | { |
412 | { |
| 385 | char *buf = (char *)buf_; |
413 | char *buf = (char *)buf_; |
| 386 | char *pos = buf; |
|
|
| 387 | int amt = 0; |
|
|
| 388 | |
414 | |
| 389 | if (status == Ns_Dead || !buf) |
415 | if (destroyed () || !buf) |
| 390 | return; |
416 | return; |
| 391 | |
417 | |
| 392 | if ((len + outputbuffer.len) > SOCKETBUFSIZE) |
418 | if (len + outputbuffer.len > SOCKETBUFSIZE) |
| 393 | { |
419 | { |
| 394 | LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); |
420 | LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); |
| 395 | destroy (); |
421 | destroy (); |
| 396 | return; |
422 | return; |
| 397 | } |
423 | } |
| … | |
… | |
| 425 | * shortcut function. |
451 | * shortcut function. |
| 426 | */ |
452 | */ |
| 427 | void |
453 | void |
| 428 | client::send_packet (packet &sl) |
454 | client::send_packet (packet &sl) |
| 429 | { |
455 | { |
| 430 | if (status == Ns_Dead) |
456 | if (destroyed ()) |
| 431 | return; |
457 | return; |
| 432 | |
458 | |
| 433 | if (sl.length () >= MAXSOCKBUF) |
459 | if (sl.length () >= MAXSOCKBUF) |
| 434 | { |
460 | { |
| 435 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
461 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
| … | |
… | |
| 481 | /*********************************************************************** |
507 | /*********************************************************************** |
| 482 | * |
508 | * |
| 483 | * packet functions/utilities |
509 | * packet functions/utilities |
| 484 | * |
510 | * |
| 485 | **********************************************************************/ |
511 | **********************************************************************/ |
|
|
512 | |
|
|
513 | packet::packet (const char *name) |
|
|
514 | { |
|
|
515 | reset (); |
|
|
516 | |
|
|
517 | int len = strlen (name); |
|
|
518 | memcpy (cur, name, len); cur += len; |
|
|
519 | *cur++ = ' '; |
|
|
520 | } |
| 486 | |
521 | |
| 487 | packet &packet::operator <<(const data &v) |
522 | packet &packet::operator <<(const data &v) |
| 488 | { |
523 | { |
| 489 | if (room () < v.len) |
524 | if (room () < v.len) |
| 490 | reset (); |
525 | reset (); |
