1 | /* |
1 | /* |
2 | * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game. |
2 | * This file is part of Crossfire TRT, the Roguelike Realtime MORPG. |
3 | * |
3 | * |
4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
5 | * Copyright (©) 1992,2007 Frank Tore Johansen |
5 | * Copyright (©) 1992,2007 Frank Tore Johansen |
6 | * |
6 | * |
7 | * Crossfire TRT is free software; you can redistribute it and/or modify it |
7 | * Crossfire TRT is free software: you can redistribute it and/or modify |
8 | * under the terms of the GNU General Public License as published by the Free |
8 | * it under the terms of the GNU General Public License as published by |
9 | * Software Foundation; either version 2 of the License, or (at your option) |
9 | * the Free Software Foundation, either version 3 of the License, or |
10 | * 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, but |
12 | * This program is distributed in the hope that it will be useful, |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | * 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 along |
17 | * You should have received a copy of the GNU General Public License |
18 | * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51 |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
19 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | * |
19 | * |
21 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
20 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
22 | */ |
21 | */ |
23 | |
22 | |
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 | */ |
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35 | |
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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 | // disconnect a socket after this many seconds without an ack |
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50 | #define SOCKET_TIMEOUT 8. |
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51 | |
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52 | // force a packet when idle for more than this many seconds, |
36 | // force a packet when idle for more than this many seconds, |
53 | // forcing an ack regularly. |
37 | // forcing an ack regularly. |
54 | #define IDLE_PING 2. |
38 | #define IDLE_PING 2. |
55 | |
39 | |
56 | void |
40 | void |
57 | client::flush () |
41 | client::flush () |
58 | { |
42 | { |
59 | if (destroyed ()) |
43 | if (destroyed ()) |
60 | return; |
44 | return; |
61 | |
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62 | #ifdef __linux__ //TODO: this is available on bsds, too, use a configure test. |
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63 | // check about once per second, spread evenly over all clients |
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64 | if (!((pticks + fd) & 7)) |
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65 | { |
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66 | // check time of last ack, and, if too old, kill connection |
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67 | struct tcp_info tcpi; |
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68 | socklen_t len = sizeof (tcpi); |
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69 | |
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70 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
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71 | { |
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72 | rtt = tcpi.tcpi_rtt; |
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73 | rttvar = tcpi.tcpi_rttvar; |
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74 | |
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75 | if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000)) |
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76 | { |
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77 | send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)"); |
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78 | write_outputbuffer (); |
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79 | |
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80 | LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
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81 | (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked); |
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82 | destroy (); |
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83 | } |
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84 | } |
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85 | } |
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86 | #endif |
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87 | |
45 | |
88 | /** |
46 | /** |
89 | * Writes data to socket. |
47 | * Writes data to socket. |
90 | * |
48 | * |
91 | * 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 |
… | |
… | |
93 | */ |
51 | */ |
94 | |
52 | |
95 | // write a nop to the socket at least every IDLE_NOP seconds. |
53 | // write a nop to the socket at least every IDLE_NOP seconds. |
96 | if (!outputbuffer.len) |
54 | if (!outputbuffer.len) |
97 | { |
55 | { |
98 | if (last_send + IDLE_PING <= NOW) |
56 | if (last_send + IDLE_PING <= NOW && pl && pl->active) |
99 | { |
57 | { |
100 | // this is a bit ugly, but map1/map1a seem to be the only |
58 | // this is a bit ugly, but map1/map1a seem to be the only |
101 | // nop'able commands and they are quite small. |
59 | // nop'able commands and they are quite small. |
102 | packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
60 | packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
103 | send_packet (sl); |
61 | send_packet (sl); |
… | |
… | |
174 | if (inbuf_len >= 2 + pkt_len) |
132 | if (inbuf_len >= 2 + pkt_len) |
175 | return 2 + pkt_len; |
133 | return 2 + pkt_len; |
176 | |
134 | |
177 | if (inbuf_len == sizeof (inbuf)) |
135 | if (inbuf_len == sizeof (inbuf)) |
178 | { |
136 | { |
179 | 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); |
180 | destroy (); |
138 | destroy (); |
181 | return -1; |
139 | return -1; |
182 | } |
140 | } |
183 | } |
141 | } |
184 | |
142 | |
… | |
… | |
258 | { |
216 | { |
259 | data += 6; |
217 | data += 6; |
260 | len -= 6; |
218 | len -= 6; |
261 | } |
219 | } |
262 | |
220 | |
263 | if (len > 4 && !strncmp (data, "say " , 4)) |
221 | if (len > 4 && data [3] == ' ' && !strncmp (data, "say " , 4)) return true; |
264 | return true; |
222 | if (len > 5 && data [4] == ' ' && !strncmp (data, "chat " , 5)) return true; |
265 | if (len > 5 && !strncmp (data, "chat ", 5)) |
223 | if (len > 6 && data [5] == ' ' && !strncmp (data, "shout ", 6)) return true; |
266 | return true; |
224 | |
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225 | if (len == 7 && !strcmp (data, "suicide")) return true; |
267 | |
226 | |
268 | return false; |
227 | return false; |
269 | } |
228 | } |
270 | |
229 | |
271 | void |
230 | void |
… | |
… | |
278 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
237 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
279 | else |
238 | else |
280 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
239 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
281 | } |
240 | } |
282 | else |
241 | else |
283 | 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); |
284 | } |
243 | } |
285 | |
244 | |
286 | bool |
245 | bool |
287 | client::handle_packet () |
246 | client::handle_packet () |
288 | { |
247 | { |
… | |
… | |
329 | |
288 | |
330 | goto next_packet; |
289 | goto next_packet; |
331 | } |
290 | } |
332 | |
291 | |
333 | // If we get here, we didn't find a valid command. |
292 | // If we get here, we didn't find a valid command. |
334 | 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); |
335 | next_packet: |
294 | next_packet: |
336 | skip_packet (pkt_len); |
295 | skip_packet (pkt_len); |
337 | |
296 | |
338 | // input buffer has space again |
297 | // input buffer has space again |
339 | socket_ev.poll (socket_ev.poll () | PE_R); |
298 | socket_ev.poll (socket_ev.poll () | PE_R); |
… | |
… | |
393 | } |
352 | } |
394 | else |
353 | else |
395 | { |
354 | { |
396 | inbuf_len += amount; |
355 | inbuf_len += amount; |
397 | |
356 | |
398 | cmd_ev.start (); |
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399 | } |
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400 | } |
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401 | } |
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402 | |
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403 | // called whenever we have additional commands to process |
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404 | void |
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405 | client::cmd_cb (iw &w) |
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406 | { |
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407 | if (handle_packet ()) |
357 | if (handle_packet ()) |
408 | w.start (); |
358 | { |
409 | else |
359 | while (handle_packet ()) |
410 | 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 | } |
411 | } |
366 | } |
412 | |
367 | |
413 | /******************************************************************************* |
368 | /******************************************************************************* |
414 | * |
369 | * |
415 | * Start of write related routines. |
370 | * Start of write related routines. |
… | |
… | |
471 | client::send_packet (packet &sl) |
426 | client::send_packet (packet &sl) |
472 | { |
427 | { |
473 | if (destroyed ()) |
428 | if (destroyed ()) |
474 | return; |
429 | return; |
475 | |
430 | |
476 | if (sl.length () >= MAXSOCKBUF) |
431 | if (sl.length () > MAXSOCKBUF) |
477 | { |
432 | { |
478 | 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 ()); |
479 | /* 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 |
480 | * it easier to debug. |
435 | * it easier to debug. |
481 | */ |
436 | */ |
… | |
… | |
519 | va_end (ap); |
474 | va_end (ap); |
520 | |
475 | |
521 | send_packet (sl); |
476 | send_packet (sl); |
522 | } |
477 | } |
523 | |
478 | |
524 | void |
479 | // returns true when the message needs special (read: perl) treatment |
525 | client::send_drawinfo (const char *msg, int flags) |
480 | static bool |
526 | { |
481 | msg_is_special (const char *msg) |
527 | send_packet_printf ("drawinfo %d %s", flags, msg); |
482 | { |
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483 | return msg [strcspn (msg, "<[&\n")]; |
528 | } |
484 | } |
529 | |
485 | |
530 | void |
486 | void |
531 | client::send_msg (int color, const char *type, const char *msg) |
487 | client::send_msg (int color, const char *type, const char *msg) |
532 | { |
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); |
533 | if (can_msg) |
499 | else if (can_msg) |
534 | send_packet_printf ("msg %d %s %s", color, type, msg); |
500 | send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg); |
535 | else if (color < 0) |
501 | else if (color < 0) |
536 | return; // client cannot handle this |
502 | return; // client cannot handle this |
537 | else if (strchr (msg, '<') || strchr (msg, '&')) |
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538 | { |
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539 | //TODO: should escape/modify to old syntax |
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540 | send_packet_printf ("drawinfo %d %s", color, msg); |
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541 | } |
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542 | else |
503 | else |
543 | 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); |
544 | } |
511 | } |
545 | |
512 | |
546 | /*********************************************************************** |
513 | /*********************************************************************** |
547 | * |
514 | * |
548 | * packet functions/utilities |
515 | * packet functions/utilities |