1 | /* |
1 | /* |
2 | * CrossFire, A Multiplayer game for X-windows |
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 | |
… | |
… | |
190 | static struct packet_type packets[] = { |
165 | static struct packet_type packets[] = { |
191 | {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 }, |
166 | {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 }, |
192 | {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 }, |
167 | {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 }, |
193 | |
168 | |
194 | {"examine", PC(ExamineCmd) PF_PLAYING }, |
169 | {"examine", PC(ExamineCmd) PF_PLAYING }, |
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170 | {"ex", PC(ExCmd) PF_PLAYING }, |
195 | {"apply", PC(ApplyCmd) PF_PLAYING }, |
171 | {"apply", PC(ApplyCmd) PF_PLAYING }, |
196 | {"lookat", PC(LookAt) PF_PLAYING }, |
172 | {"lookat", PC(LookAt) PF_PLAYING }, |
197 | {"lock", PC(LockItem) PF_PLAYING }, |
173 | {"lock", PC(LockItem) PF_PLAYING }, |
198 | {"mark", PC(MarkItem) PF_PLAYING }, |
174 | {"mark", PC(MarkItem) PF_PLAYING }, |
199 | {"move", PC(MoveCmd) PF_PLAYING }, |
175 | {"move", PC(MoveCmd) PF_PLAYING }, |
200 | {"ext", PC(ExtCmd) 0 }, /* CF+ */ |
176 | {"ext", PC(ExtCmd) 0 }, // CF+ |
201 | {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ |
177 | {"mapredraw", PC(MapRedrawCmd) 0 }, |
202 | {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ |
178 | {"mapinfo", PC(MapInfoCmd) 0 }, // CF+ |
203 | |
179 | |
204 | {"reply", SC(ReplyCmd) 0 }, |
180 | {"reply", SC(ReplyCmd) 0 }, |
205 | {"exti", SC(ExtiCmd) 0 }, /* CF+ */ |
181 | {"exti", SC(ExtiCmd) 0 }, // CF+ |
206 | {"addme", SC(AddMeCmd) 0 }, |
182 | {"addme", SC(AddMeCmd) 0 }, |
207 | {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ |
183 | {"askface", SC(AskFaceCmd) 0 }, |
208 | {"requestinfo", SC(RequestInfo) 0 }, |
184 | {"requestinfo", SC(RequestInfo) 0 }, |
209 | {"setfacemode", SC(SetFaceMode) 0 }, |
185 | {"setfacemode", SC(SetFaceMode) 0 }, |
210 | {"setsound", SC(SetSound) 0 }, |
186 | {"setsound", SC(SetSound) 0 }, |
211 | {"setup", SC(SetUp) 0 }, |
187 | {"setup", SC(SetUp) 0 }, |
212 | {"version", SC(VersionCmd) 0 }, |
188 | {"version", SC(VersionCmd) 0 }, |
… | |
… | |
260 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
236 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
261 | else |
237 | else |
262 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
238 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
263 | } |
239 | } |
264 | else |
240 | else |
265 | send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); |
241 | send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name); |
266 | } |
242 | } |
267 | |
243 | |
268 | bool |
244 | bool |
269 | client::handle_packet () |
245 | client::handle_packet () |
270 | { |
246 | { |
… | |
… | |
311 | |
287 | |
312 | goto next_packet; |
288 | goto next_packet; |
313 | } |
289 | } |
314 | |
290 | |
315 | // If we get here, we didn't find a valid command. |
291 | // If we get here, we didn't find a valid command. |
316 | send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); |
292 | send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2); |
317 | next_packet: |
293 | next_packet: |
318 | skip_packet (pkt_len); |
294 | skip_packet (pkt_len); |
319 | |
295 | |
320 | // input buffer has space again |
296 | // input buffer has space again |
321 | socket_ev.poll (socket_ev.poll () | PE_R); |
297 | socket_ev.poll (socket_ev.poll () | PE_R); |
… | |
… | |
375 | } |
351 | } |
376 | else |
352 | else |
377 | { |
353 | { |
378 | inbuf_len += amount; |
354 | inbuf_len += amount; |
379 | |
355 | |
380 | cst_tot.ibytes += amount; |
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381 | cst_lst.ibytes += amount; |
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382 | |
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383 | cmd_ev.start (); |
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384 | } |
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385 | } |
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386 | } |
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387 | |
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388 | // called whenever we have additional commands to process |
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389 | void |
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390 | client::cmd_cb (iw &w) |
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391 | { |
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392 | if (handle_packet ()) |
356 | if (handle_packet ()) |
393 | w.start (); |
357 | { |
394 | else |
358 | while (handle_packet ()) |
395 | flush (); |
359 | ; |
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360 | |
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361 | flush (); |
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362 | } |
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363 | } |
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364 | } |
396 | } |
365 | } |
397 | |
366 | |
398 | /******************************************************************************* |
367 | /******************************************************************************* |
399 | * |
368 | * |
400 | * Start of write related routines. |
369 | * Start of write related routines. |
… | |
… | |
416 | return; |
385 | return; |
417 | |
386 | |
418 | if (len + outputbuffer.len > SOCKETBUFSIZE) |
387 | if (len + outputbuffer.len > SOCKETBUFSIZE) |
419 | { |
388 | { |
420 | LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); |
389 | LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); |
421 | destroy (); |
390 | // shutdown the socket, this is safer than destroying it immediately |
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391 | // as lots of code in the callchain might still access the map etc. |
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392 | shutdown (fd, SHUT_RDWR); |
422 | return; |
393 | return; |
423 | } |
394 | } |
424 | |
395 | |
425 | int avail, end; |
396 | int avail, end; |
426 | |
397 | |
… | |
… | |
454 | client::send_packet (packet &sl) |
425 | client::send_packet (packet &sl) |
455 | { |
426 | { |
456 | if (destroyed ()) |
427 | if (destroyed ()) |
457 | return; |
428 | return; |
458 | |
429 | |
459 | if (sl.length () >= MAXSOCKBUF) |
430 | if (sl.length () > MAXSOCKBUF) |
460 | { |
431 | { |
461 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
432 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
462 | /* Almost certainly we've overflowed a buffer, so quit now to make |
433 | /* Almost certainly we've overflowed a buffer, so quit now to make |
463 | * it easier to debug. |
434 | * it easier to debug. |
464 | */ |
435 | */ |
… | |
… | |
502 | va_end (ap); |
473 | va_end (ap); |
503 | |
474 | |
504 | send_packet (sl); |
475 | send_packet (sl); |
505 | } |
476 | } |
506 | |
477 | |
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478 | // returns true when the message needs special (read: perl) treatment |
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479 | static bool |
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480 | msg_is_special (const char *msg) |
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481 | { |
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482 | return msg [strcspn (msg, "<[&\n")]; |
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483 | } |
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484 | |
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485 | void |
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486 | client::send_msg (int color, const char *type, const char *msg) |
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487 | { |
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488 | if (!msg || !type) // it can happen (for example, missing attack messages cause this) |
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489 | { |
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490 | LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg); |
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491 | return; |
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492 | } |
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493 | |
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494 | int len = strlen (msg); |
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495 | |
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496 | if (msg_is_special (msg) || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)) |
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497 | cfperl_send_msg (this, color, type, msg); |
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498 | else if (can_msg) |
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499 | send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg); |
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500 | else if (color < 0) |
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501 | return; // client cannot handle this |
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502 | else |
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503 | send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg); |
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504 | } |
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505 | |
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506 | void |
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507 | client::send_drawinfo (const char *msg, int flags) |
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508 | { |
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509 | send_msg (flags, "log", msg); |
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510 | } |
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511 | |
507 | /*********************************************************************** |
512 | /*********************************************************************** |
508 | * |
513 | * |
509 | * packet functions/utilities |
514 | * packet functions/utilities |
510 | * |
515 | * |
511 | **********************************************************************/ |
516 | **********************************************************************/ |
… | |
… | |
517 | int len = strlen (name); |
522 | int len = strlen (name); |
518 | memcpy (cur, name, len); cur += len; |
523 | memcpy (cur, name, len); cur += len; |
519 | *cur++ = ' '; |
524 | *cur++ = ' '; |
520 | } |
525 | } |
521 | |
526 | |
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527 | packet &packet::operator <<(const ber32 v) |
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528 | { |
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529 | enum { maxlen = 32 / 7 + 1}; |
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530 | uint8 buf[maxlen]; |
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531 | uint8 *p = buf + maxlen; |
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532 | uint32 val = v.val; |
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533 | |
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534 | *--p = val & 0x7F; |
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535 | |
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536 | while (val > 0x7F) |
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537 | { |
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538 | val >>= 7; |
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539 | *--p = (val & 0x7F) | 0x80; |
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540 | } |
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541 | |
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542 | return *this << data (p, buf + maxlen - p); |
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543 | } |
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544 | |
522 | packet &packet::operator <<(const data &v) |
545 | packet &packet::operator <<(const data &v) |
523 | { |
546 | { |
524 | if (room () < v.len) |
547 | if (room () < v.len) |
525 | reset (); |
548 | reset (); |
526 | else |
549 | else |
… | |
… | |
563 | return reset (); |
586 | return reset (); |
564 | |
587 | |
565 | cur += len; |
588 | cur += len; |
566 | } |
589 | } |
567 | |
590 | |
568 | /****************************************************************************** |
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569 | * |
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570 | * statistics logging functions. |
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571 | * |
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572 | ******************************************************************************/ |
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573 | |
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574 | #ifdef CS_LOGSTATS |
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575 | |
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576 | /* cst_tot is for the life of the server, cst_last is for the last series of |
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577 | * stats |
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578 | */ |
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579 | CS_Stats cst_tot, cst_lst; |
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580 | |
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581 | /** |
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582 | * Writes out the gathered stats. We clear cst_lst. |
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583 | */ |
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584 | void |
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585 | write_cs_stats (void) |
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586 | { |
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587 | time_t now = time (NULL); |
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588 | |
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589 | /* If no connections recently, don't both to log anything */ |
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590 | if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
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591 | return; |
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592 | |
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593 | /* CSSTAT is put in so scripts can easily find the line */ |
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594 | LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
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595 | ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
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596 | now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
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597 | cst_lst.ibytes = 0; |
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598 | cst_lst.obytes = 0; |
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599 | cst_lst.time_start = now; |
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600 | } |
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601 | #endif |
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602 | |
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