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... |
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|
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 | |
|
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204 | {"reply", SC(ReplyCmd) 0 }, |
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|
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(AskFaceCmd) 0 }, |
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 | } |
|
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224 | |
|
|
225 | // HACK: some commands currently should be executed |
|
|
226 | // even when the player is frozen. this hack detects |
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227 | // those commands. it should be folded into may_execute, |
|
|
228 | // but kept seperate to emphasise the hack aspect, i.e. |
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229 | // do it better, then remove. |
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230 | static bool |
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231 | always_immediate (const client *ns, const packet_type *pkt, const char *data, int len) |
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232 | { |
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233 | if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6))) |
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234 | return false; |
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235 | |
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236 | if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map) |
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237 | return false; |
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238 | |
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239 | if (pkt->flags & PF_COMMAND6) |
|
|
240 | { |
|
|
241 | data += 6; |
|
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242 | len -= 6; |
|
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243 | } |
|
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244 | |
|
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245 | if (len > 4 && !strncmp (data, "say " , 4)) |
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246 | return true; |
|
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247 | if (len > 5 && !strncmp (data, "chat ", 5)) |
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248 | return true; |
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249 | |
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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)) |
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308 | queue_command (pkt, data, datalen); |
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309 | else |
277 | execute (pkt, data, datalen); |
310 | execute (pkt, data, datalen); |
278 | else |
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279 | queue_command (pkt, data, datalen); |
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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 |
|
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286 | * user could certainly send a whole bunch of invalid commands. |
|
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287 | */ |
|
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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; |
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387 | int amt = 0; |
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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 | // shutdown the socket, this is safer than destroying it immediately |
|
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422 | // as lots of code in the callchain might still access the map etc. |
|
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423 | shutdown (fd, SHUT_RDWR); |
396 | return; |
424 | return; |
397 | } |
425 | } |
398 | |
426 | |
399 | int avail, end; |
427 | int avail, end; |
400 | |
428 | |
… | |
… | |
425 | * shortcut function. |
453 | * shortcut function. |
426 | */ |
454 | */ |
427 | void |
455 | void |
428 | client::send_packet (packet &sl) |
456 | client::send_packet (packet &sl) |
429 | { |
457 | { |
430 | if (status == Ns_Dead) |
458 | if (destroyed ()) |
431 | return; |
459 | return; |
432 | |
460 | |
433 | if (sl.length () >= MAXSOCKBUF) |
461 | if (sl.length () >= MAXSOCKBUF) |
434 | { |
462 | { |
435 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
463 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
… | |
… | |
476 | va_end (ap); |
504 | va_end (ap); |
477 | |
505 | |
478 | send_packet (sl); |
506 | send_packet (sl); |
479 | } |
507 | } |
480 | |
508 | |
|
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509 | void |
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510 | client::send_drawinfo (const char *msg, int flags) |
|
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511 | { |
|
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512 | send_packet_printf ("drawinfo %d %s", flags, msg); |
|
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513 | } |
|
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514 | |
481 | /*********************************************************************** |
515 | /*********************************************************************** |
482 | * |
516 | * |
483 | * packet functions/utilities |
517 | * packet functions/utilities |
484 | * |
518 | * |
485 | **********************************************************************/ |
519 | **********************************************************************/ |
|
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520 | |
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521 | packet::packet (const char *name) |
|
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522 | { |
|
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523 | reset (); |
|
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524 | |
|
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525 | int len = strlen (name); |
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526 | memcpy (cur, name, len); cur += len; |
|
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527 | *cur++ = ' '; |
|
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528 | } |
|
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529 | |
|
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530 | packet &packet::operator <<(const ber32 v) |
|
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531 | { |
|
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532 | enum { maxlen = 32 / 7 + 1}; |
|
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533 | uint8 buf[maxlen]; |
|
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534 | uint8 *p = buf + maxlen; |
|
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535 | uint32 val = v.val; |
|
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536 | |
|
|
537 | while (val > 0x7F) |
|
|
538 | { |
|
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539 | *--p = (val & 0x7F) | 0x80; |
|
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540 | val >>= 7; |
|
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541 | } |
|
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542 | |
|
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543 | *--p = val; |
|
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544 | |
|
|
545 | return *this << data (p, buf + maxlen - p); |
|
|
546 | } |
486 | |
547 | |
487 | packet &packet::operator <<(const data &v) |
548 | packet &packet::operator <<(const data &v) |
488 | { |
549 | { |
489 | if (room () < v.len) |
550 | if (room () < v.len) |
490 | reset (); |
551 | reset (); |