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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.49 by root, Sun Jul 1 05:00:20 2007 UTC vs.
Revision 1.71 by root, Mon Oct 12 14:00:59 2009 UTC

1/* 1/*
2 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG. 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 * 3 *
4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team 4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra 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 7 * Deliantra is free software: you can redistribute it and/or modify it under
8 * it under the terms of the GNU General Public License as published by 8 * the terms of the Affero GNU General Public License as published by the
9 * the Free Software Foundation, either version 3 of the License, or 9 * Free Software Foundation, either version 3 of the License, or (at your
10 * (at your option) any later version. 10 * 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 Affero GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 * and the GNU General Public License along with this program. If not, see
19 * <http://www.gnu.org/licenses/>.
19 * 20 *
20 * The authors can be reached via e-mail to <crossfire@schmorp.de> 21 * The authors can be reached via e-mail to <support@deliantra.net>
21 */ 22 */
22 23
23using namespace std; 24using namespace std;
24 25
25#include <global.h> 26#include <global.h>
… …
31# include <sys/socket.h> 32# include <sys/socket.h>
32# include <netinet/in.h> 33# include <netinet/in.h>
33# include <netinet/tcp.h> 34# include <netinet/tcp.h>
34#endif 35#endif
35 36
36// disconnect a socket after this many seconds without an ack
37#define SOCKET_TIMEOUT 8.
38
39// force a packet when idle for more than this many seconds, 37// force a packet when idle for more than this many seconds,
40// forcing an ack regularly. 38// forcing an ack regularly.
41#define IDLE_PING 2. 39#define IDLE_PING 2.
42 40
43void 41void
44client::flush () 42client::flush ()
45{ 43{
46 if (destroyed ()) 44 if (destroyed ())
47 return; 45 return;
48
49#if HAVE_TCP_INFO
50 // check about once per second, spread evenly over all clients
51 // do this only when player is active
52 if (!((pticks + fd) & 7) && pl && pl->active)
53 {
54 // check time of last ack, and, if too old, kill connection
55 struct tcp_info tcpi;
56 socklen_t len = sizeof (tcpi);
57
58 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
59 {
60 if (tcpi.tcpi_snd_mss)
61 mss = tcpi.tcpi_snd_mss;
62
63 rtt = tcpi.tcpi_rtt;
64 rttvar = tcpi.tcpi_rttvar;
65
66 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
67 {
68 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
69 write_outputbuffer ();
70
71 LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
72 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
73 destroy ();
74 }
75 }
76 }
77#endif
78 46
79 /** 47 /**
80 * Writes data to socket. 48 * Writes data to socket.
81 * 49 *
82 * When the socket is clear to write, and we have backlogged data, this 50 * When the socket is clear to write, and we have backlogged data, this
… …
95 } 63 }
96 else 64 else
97 return; 65 return;
98 } 66 }
99 67
100 if (socket_ev.poll () & PE_W) 68 if (socket_ev.poll () & EV_WRITE)
101 return; 69 return;
102 70
103 last_send = NOW; 71 last_send = NOW;
104 write_outputbuffer (); 72 write_outputbuffer ();
105} 73}
… …
132 // just retry 100 // just retry
133 } 101 }
134 else if (errno == EAGAIN) 102 else if (errno == EAGAIN)
135 { 103 {
136 // delay till ready 104 // delay till ready
137 socket_ev.poll (socket_ev.poll () | PE_W); 105 socket_ev.poll (socket_ev.poll () | EV_WRITE);
138 socket_ev.start (); 106 socket_ev.start ();
139 return; 107 return;
140 } 108 }
141 else 109 else
142 { 110 {
… …
144 destroy (); 112 destroy ();
145 return; 113 return;
146 } 114 }
147 } 115 }
148 116
149 socket_ev.poll (socket_ev.poll () & ~PE_W); 117 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
150} 118}
151 119
152/****************************************************************************** 120/******************************************************************************
153 * 121 *
154 * Start of read routines. 122 * Start of read routines.
… …
165 if (inbuf_len >= 2 + pkt_len) 133 if (inbuf_len >= 2 + pkt_len)
166 return 2 + pkt_len; 134 return 2 + pkt_len;
167 135
168 if (inbuf_len == sizeof (inbuf)) 136 if (inbuf_len == sizeof (inbuf))
169 { 137 {
170 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED); 138 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY);
171 destroy (); 139 destroy ();
172 return -1; 140 return -1;
173 } 141 }
174 } 142 }
175 143
… …
213 {"reply", SC(ReplyCmd) 0 }, 181 {"reply", SC(ReplyCmd) 0 },
214 {"exti", SC(ExtiCmd) 0 }, // CF+ 182 {"exti", SC(ExtiCmd) 0 }, // CF+
215 {"addme", SC(AddMeCmd) 0 }, 183 {"addme", SC(AddMeCmd) 0 },
216 {"askface", SC(AskFaceCmd) 0 }, 184 {"askface", SC(AskFaceCmd) 0 },
217 {"requestinfo", SC(RequestInfo) 0 }, 185 {"requestinfo", SC(RequestInfo) 0 },
218 {"setfacemode", SC(SetFaceMode) 0 },
219 {"setsound", SC(SetSound) 0 }, 186 {"setsound", SC(SetSound) 0 },
220 {"setup", SC(SetUp) 0 }, 187 {"setup", SC(SetUp) 0 },
221 {"version", SC(VersionCmd) 0 }, 188 {"version", SC(VersionCmd) 0 },
222 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
223 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */ 189 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
224 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
225}; 190};
226 191
227bool 192bool
228client::may_execute (const packet_type *pkt) const 193client::may_execute (const packet_type *pkt) const
229{ 194{
… …
249 { 214 {
250 data += 6; 215 data += 6;
251 len -= 6; 216 len -= 6;
252 } 217 }
253 218
254 if (len > 4 && !strncmp (data, "say " , 4)) 219 if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
255 return true; 220 if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
256 if (len > 5 && !strncmp (data, "chat ", 5)) 221 if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
257 return true; 222 if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
223 if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
224
225 if (len == 7 && !strcmp (data, "suicide")) return true;
258 226
259 return false; 227 return false;
260} 228}
261 229
262void 230void
… …
269 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 237 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
270 else 238 else
271 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 239 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
272 } 240 }
273 else 241 else
274 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);
275} 243}
276 244
277bool 245bool
278client::handle_packet () 246client::handle_packet ()
279{ 247{
… …
320 288
321 goto next_packet; 289 goto next_packet;
322 } 290 }
323 291
324 // If we get here, we didn't find a valid command. 292 // If we get here, we didn't find a valid command.
325 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);
326next_packet: 294next_packet:
327 skip_packet (pkt_len); 295 skip_packet (pkt_len);
328 296
329 // input buffer has space again 297 // input buffer has space again
330 socket_ev.poll (socket_ev.poll () | PE_R); 298 socket_ev.poll (socket_ev.poll () | EV_READ);
331 299
332 return true; 300 return true;
333} 301}
334 302
335// callback called when socket is either readable or writable 303// callback called when socket is either readable or writable
336void 304void
337client::socket_cb (iow &w, int got) 305client::socket_cb (iow &w, int revents)
338{ 306{
339 //TODO remove when we have better socket cleanup logic 307 //TODO remove when we have better socket cleanup logic
340 if (destroyed ()) 308 if (destroyed ())
341 { 309 {
342 socket_ev.poll (0); 310 socket_ev.poll (0);
343 return; 311 return;
344 } 312 }
345 313
346 if (got & PE_W) 314 if (revents & EV_WRITE)
347 { 315 {
348 write_outputbuffer (); 316 write_outputbuffer ();
349 317
350 if (!outputbuffer.len) 318 if (!outputbuffer.len)
351 socket_ev.poll (socket_ev.poll () & ~PE_W); 319 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
352 } 320 }
353 321
354 if (got & PE_R) 322 if (revents & EV_READ)
355 { 323 {
356 //TODO: rate-limit tcp connection in better ways, important 324 //TODO: rate-limit tcp connection in better ways, important
357 325
358 int amount = sizeof (inbuf) - inbuf_len; 326 int amount = sizeof (inbuf) - inbuf_len;
359 327
360 if (!amount) 328 if (!amount)
361 { 329 {
362 // input buffer full 330 // input buffer full
363 socket_ev.poll (socket_ev.poll () & ~PE_R); 331 socket_ev.poll (socket_ev.poll () & ~EV_READ);
364 return; 332 return;
365 } 333 }
366 334
367 amount = read (fd, inbuf + inbuf_len, amount); 335 amount = read (fd, inbuf + inbuf_len, amount);
368 336
… …
384 } 352 }
385 else 353 else
386 { 354 {
387 inbuf_len += amount; 355 inbuf_len += amount;
388 356
389 cmd_ev.start ();
390 }
391 }
392}
393
394// called whenever we have additional commands to process
395void
396client::cmd_cb (iw &w)
397{
398 if (handle_packet ()) 357 if (handle_packet ())
399 w.start (); 358 {
400 else 359 while (handle_packet ())
401 flush (); 360 ;
361
362 flush ();
363 }
364 }
365 }
402} 366}
403 367
404/******************************************************************************* 368/*******************************************************************************
405 * 369 *
406 * Start of write related routines. 370 * Start of write related routines.
… …
462client::send_packet (packet &sl) 426client::send_packet (packet &sl)
463{ 427{
464 if (destroyed ()) 428 if (destroyed ())
465 return; 429 return;
466 430
467 if (sl.length () >= MAXSOCKBUF) 431 if (sl.length () > MAXSOCKBUF)
468 { 432 {
469 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 ());
470 /* 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
471 * it easier to debug. 435 * it easier to debug.
472 */ 436 */
… …
510 va_end (ap); 474 va_end (ap);
511 475
512 send_packet (sl); 476 send_packet (sl);
513} 477}
514 478
515// returns true when the message needs special (read: perl) treatment
516static bool
517msg_is_special (const char *msg)
518{
519 return msg [strcspn (msg, "<[&\n")];
520}
521
522void 479void
523client::send_msg (int color, const char *type, const char *msg) 480client::send_msg (int color, const char *type, const char *msg)
524{ 481{
482 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
483 {
484 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
485 return;
486 }
487
488 int len = strlen (msg);
489
490 if (!(color & NDI_VERBATIM)
525 if (msg_is_special (msg)) 491 && (msg_is_special (msg)
492 || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)))
526 cfperl_send_msg (this, color, type, msg); 493 cfperl_send_msg (this, color, type, msg);
527 else if (can_msg)
528 send_packet_printf ("msg %d %s %s", color, type, msg);
529 else if (color < 0)
530 return; // client cannot handle this
531 else 494 else
532 send_packet_printf ("drawinfo %d %s", color, msg); 495 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
533} 496}
534 497
535void 498void
536client::send_drawinfo (const char *msg, int flags) 499client::send_drawinfo (const char *msg, int flags)
537{ 500{

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