1 | /* |
1 | /* |
2 | * CrossFire, A Multiplayer game |
2 | * This file is part of Crossfire TRT, the Roguelike Realtime MORPG. |
3 | * |
3 | * |
4 | * Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team |
4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
5 | * Copyright (C) 1992 Frank Tore Johansen |
5 | * Copyright (©) 1992,2007 Frank Tore Johansen |
6 | * |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
7 | * Crossfire TRT is free software: you can redistribute it and/or modify |
8 | * 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 |
9 | * the Free Software Foundation; either version 2 of the License, or |
9 | * the Free Software Foundation, either version 3 of the License, or |
10 | * (at your option) any later version. |
10 | * (at your option) any later version. |
11 | * |
11 | * |
12 | * 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, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | * GNU General Public License for more details. |
15 | * GNU General Public License for more details. |
16 | * |
16 | * |
17 | * 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 |
18 | * along with this program; if not, write to the Free Software |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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20 | * |
19 | * |
21 | * The author can be reached via e-mail to mark@pyramid.com |
20 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
22 | */ |
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23 | |
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24 | /** |
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25 | * \file |
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26 | * Low-level socket-related functions. |
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27 | * |
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28 | * \date 2003-12-02 |
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29 | * |
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30 | * Contains some base functions that both the client and server |
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31 | * can use. As such, depending what we are being compiled for will |
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32 | * determine what we can include. the client is designed have |
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33 | * CFCLIENT defined as part of its compile flags. |
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34 | */ |
21 | */ |
35 | |
22 | |
36 | using namespace std; |
23 | using namespace std; |
37 | |
24 | |
38 | #include <global.h> |
25 | #include <global.h> |
39 | #include <sproto.h> |
26 | #include <sproto.h> |
40 | #include <cstdarg> |
27 | #include <cstdarg> |
41 | |
28 | |
42 | #ifdef __linux__ |
29 | #if HAVE_TCP_INFO |
43 | # include <sys/types.h> |
30 | # include <sys/types.h> |
44 | # include <sys/socket.h> |
31 | # include <sys/socket.h> |
45 | # include <netinet/in.h> |
32 | # include <netinet/in.h> |
46 | # include <netinet/tcp.h> |
33 | # include <netinet/tcp.h> |
47 | #endif |
34 | #endif |
48 | |
35 | |
49 | // use a really low timeout, as it doesn't cost any bandwidth, and you can |
36 | // force a packet when idle for more than this many seconds, |
50 | // easily die in 20 seconds... |
37 | // forcing an ack regularly. |
51 | #define SOCKET_TIMEOUT1 10 * 1000 |
38 | #define IDLE_PING 2. |
52 | #define SOCKET_TIMEOUT2 20 * 1000 |
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53 | |
39 | |
54 | void |
40 | void |
55 | client::flush () |
41 | client::flush () |
56 | { |
42 | { |
57 | if (destroyed ()) |
43 | if (destroyed ()) |
58 | return; |
44 | return; |
59 | |
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60 | #ifdef __linux__ |
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61 | // check time of last ack, and, if too old, kill connection |
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62 | struct tcp_info tcpi; |
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63 | socklen_t len = sizeof (tcpi); |
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64 | |
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65 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
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66 | { |
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67 | unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; |
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68 | |
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69 | rtt = tcpi.tcpi_rtt; |
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70 | rttvar = tcpi.tcpi_rttvar; |
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71 | |
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72 | if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s |
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73 | && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s |
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74 | { |
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75 | LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
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76 | (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); |
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77 | destroy (); |
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78 | } |
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79 | } |
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80 | #endif |
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81 | |
45 | |
82 | /** |
46 | /** |
83 | * Writes data to socket. |
47 | * Writes data to socket. |
84 | * |
48 | * |
85 | * When the socket is clear to write, and we have backlogged data, this |
49 | * When the socket is clear to write, and we have backlogged data, this |
86 | * is called to write it out. |
50 | * is called to write it out. |
87 | */ |
51 | */ |
88 | |
52 | |
89 | if (!outputbuffer.len || socket_ev.poll () & PE_W) |
53 | // write a nop to the socket at least every IDLE_NOP seconds. |
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54 | if (!outputbuffer.len) |
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55 | { |
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56 | if (last_send + IDLE_PING <= NOW && pl && pl->active) |
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57 | { |
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58 | // this is a bit ugly, but map1/map1a seem to be the only |
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59 | // nop'able commands and they are quite small. |
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60 | packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
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61 | send_packet (sl); |
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62 | } |
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63 | else |
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64 | return; |
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65 | } |
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66 | |
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67 | if (socket_ev.poll () & PE_W) |
90 | return; |
68 | return; |
91 | |
69 | |
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70 | last_send = NOW; |
92 | write_outputbuffer (); |
71 | write_outputbuffer (); |
93 | } |
72 | } |
94 | |
73 | |
95 | void |
74 | void |
96 | client::write_outputbuffer () |
75 | client::write_outputbuffer () |
… | |
… | |
106 | /* wrap back to start of buffer */ |
85 | /* wrap back to start of buffer */ |
107 | if (outputbuffer.start == SOCKETBUFSIZE) |
86 | if (outputbuffer.start == SOCKETBUFSIZE) |
108 | outputbuffer.start = 0; |
87 | outputbuffer.start = 0; |
109 | |
88 | |
110 | outputbuffer.len -= res; |
89 | outputbuffer.len -= res; |
111 | #ifdef CS_LOGSTATS |
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112 | cst_tot.obytes += res; |
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113 | cst_lst.obytes += res; |
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114 | #endif |
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115 | } |
90 | } |
116 | else if (res == 0) |
91 | else if (res == 0) |
117 | { |
92 | { |
118 | LOG (llevError, "socket write failed, connection closed.\n"); |
93 | LOG (llevError, "socket write failed, connection closed.\n"); |
119 | destroy (); |
94 | destroy (); |
… | |
… | |
157 | if (inbuf_len >= 2 + pkt_len) |
132 | if (inbuf_len >= 2 + pkt_len) |
158 | return 2 + pkt_len; |
133 | return 2 + pkt_len; |
159 | |
134 | |
160 | if (inbuf_len == sizeof (inbuf)) |
135 | if (inbuf_len == sizeof (inbuf)) |
161 | { |
136 | { |
162 | send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED); |
137 | send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY); |
163 | destroy (); |
138 | destroy (); |
164 | return -1; |
139 | return -1; |
165 | } |
140 | } |
166 | } |
141 | } |
167 | |
142 | |
… | |
… | |
241 | { |
216 | { |
242 | data += 6; |
217 | data += 6; |
243 | len -= 6; |
218 | len -= 6; |
244 | } |
219 | } |
245 | |
220 | |
246 | if (len > 4 && !strncmp (data, "say " , 4)) |
221 | if (len > 4 && data [3] == ' ' && !strncmp (data, "say " , 4)) return true; |
247 | return true; |
222 | if (len > 5 && data [4] == ' ' && !strncmp (data, "chat " , 5)) return true; |
248 | if (len > 5 && !strncmp (data, "chat ", 5)) |
223 | if (len > 6 && data [5] == ' ' && !strncmp (data, "shout ", 6)) return true; |
249 | return true; |
224 | |
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225 | if (len == 7 && !strcmp (data, "suicide")) return true; |
250 | |
226 | |
251 | return false; |
227 | return false; |
252 | } |
228 | } |
253 | |
229 | |
254 | void |
230 | void |
… | |
… | |
261 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
237 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
262 | else |
238 | else |
263 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
239 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
264 | } |
240 | } |
265 | else |
241 | else |
266 | send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); |
242 | send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name); |
267 | } |
243 | } |
268 | |
244 | |
269 | bool |
245 | bool |
270 | client::handle_packet () |
246 | client::handle_packet () |
271 | { |
247 | { |
… | |
… | |
312 | |
288 | |
313 | goto next_packet; |
289 | goto next_packet; |
314 | } |
290 | } |
315 | |
291 | |
316 | // If we get here, we didn't find a valid command. |
292 | // If we get here, we didn't find a valid command. |
317 | send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); |
293 | send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2); |
318 | next_packet: |
294 | next_packet: |
319 | skip_packet (pkt_len); |
295 | skip_packet (pkt_len); |
320 | |
296 | |
321 | // input buffer has space again |
297 | // input buffer has space again |
322 | socket_ev.poll (socket_ev.poll () | PE_R); |
298 | socket_ev.poll (socket_ev.poll () | PE_R); |
… | |
… | |
376 | } |
352 | } |
377 | else |
353 | else |
378 | { |
354 | { |
379 | inbuf_len += amount; |
355 | inbuf_len += amount; |
380 | |
356 | |
381 | cst_tot.ibytes += amount; |
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382 | cst_lst.ibytes += amount; |
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383 | |
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384 | cmd_ev.start (); |
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385 | } |
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386 | } |
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387 | } |
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388 | |
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389 | // called whenever we have additional commands to process |
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390 | void |
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391 | client::cmd_cb (iw &w) |
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392 | { |
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393 | if (handle_packet ()) |
357 | if (handle_packet ()) |
394 | w.start (); |
358 | { |
395 | else |
359 | while (handle_packet ()) |
396 | flush (); |
360 | ; |
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361 | |
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362 | flush (); |
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363 | } |
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364 | } |
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365 | } |
397 | } |
366 | } |
398 | |
367 | |
399 | /******************************************************************************* |
368 | /******************************************************************************* |
400 | * |
369 | * |
401 | * Start of write related routines. |
370 | * Start of write related routines. |
… | |
… | |
457 | client::send_packet (packet &sl) |
426 | client::send_packet (packet &sl) |
458 | { |
427 | { |
459 | if (destroyed ()) |
428 | if (destroyed ()) |
460 | return; |
429 | return; |
461 | |
430 | |
462 | if (sl.length () >= MAXSOCKBUF) |
431 | if (sl.length () > MAXSOCKBUF) |
463 | { |
432 | { |
464 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
433 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
465 | /* Almost certainly we've overflowed a buffer, so quit now to make |
434 | /* Almost certainly we've overflowed a buffer, so quit now to make |
466 | * it easier to debug. |
435 | * it easier to debug. |
467 | */ |
436 | */ |
… | |
… | |
505 | va_end (ap); |
474 | va_end (ap); |
506 | |
475 | |
507 | send_packet (sl); |
476 | send_packet (sl); |
508 | } |
477 | } |
509 | |
478 | |
510 | void |
479 | // returns true when the message needs special (read: perl) treatment |
511 | client::send_drawinfo (const char *msg, int flags) |
480 | static bool |
512 | { |
481 | msg_is_special (const char *msg) |
513 | send_packet_printf ("drawinfo %d %s", flags, msg); |
482 | { |
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483 | return msg [strcspn (msg, "<[&\n")]; |
514 | } |
484 | } |
515 | |
485 | |
516 | void |
486 | void |
517 | client::send_msg (int color, const char *type, const char *msg) |
487 | client::send_msg (int color, const char *type, const char *msg) |
518 | { |
488 | { |
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489 | if (!msg || !type) // it can happen (for example, missing attack messages cause this) |
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490 | { |
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491 | LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg); |
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492 | return; |
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493 | } |
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494 | |
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495 | int len = strlen (msg); |
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496 | |
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497 | if (msg_is_special (msg) || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)) |
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498 | cfperl_send_msg (this, color, type, msg); |
519 | if (can_msg) |
499 | else if (can_msg) |
520 | send_packet_printf ("msg %d %s %s", color, type, msg); |
500 | send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg); |
521 | else if (color < 0) |
501 | else if (color < 0) |
522 | return; // client cannot handle this |
502 | return; // client cannot handle this |
523 | else if (strchr (msg, '<') || strchr (msg, '&')) |
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524 | { |
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525 | //TODO: should escape/modify to old syntax |
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526 | send_packet_printf ("drawinfo %d %s", color, msg); |
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527 | } |
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528 | else |
503 | else |
529 | send_packet_printf ("drawinfo %d %s", color, msg); |
504 | send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg); |
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505 | } |
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506 | |
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507 | void |
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508 | client::send_drawinfo (const char *msg, int flags) |
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509 | { |
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510 | send_msg (flags, "log", msg); |
530 | } |
511 | } |
531 | |
512 | |
532 | /*********************************************************************** |
513 | /*********************************************************************** |
533 | * |
514 | * |
534 | * packet functions/utilities |
515 | * packet functions/utilities |
… | |
… | |
606 | return reset (); |
587 | return reset (); |
607 | |
588 | |
608 | cur += len; |
589 | cur += len; |
609 | } |
590 | } |
610 | |
591 | |
611 | /****************************************************************************** |
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612 | * |
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613 | * statistics logging functions. |
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614 | * |
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615 | ******************************************************************************/ |
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616 | |
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617 | #ifdef CS_LOGSTATS |
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618 | |
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619 | /* cst_tot is for the life of the server, cst_last is for the last series of |
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620 | * stats |
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621 | */ |
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622 | CS_Stats cst_tot, cst_lst; |
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623 | |
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624 | /** |
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625 | * Writes out the gathered stats. We clear cst_lst. |
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626 | */ |
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627 | void |
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628 | write_cs_stats (void) |
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629 | { |
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630 | time_t now = time (NULL); |
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631 | |
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632 | /* If no connections recently, don't both to log anything */ |
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633 | if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
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634 | return; |
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635 | |
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636 | /* CSSTAT is put in so scripts can easily find the line */ |
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637 | LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
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638 | ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
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639 | now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
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640 | cst_lst.ibytes = 0; |
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641 | cst_lst.obytes = 0; |
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642 | cst_lst.time_start = now; |
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643 | } |
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644 | #endif |
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645 | |
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