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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.48 by root, Sun Jun 24 04:09:29 2007 UTC vs.
Revision 1.72 by root, Tue Oct 13 18:20:08 2009 UTC

1/* 1/*
2 * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game. 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 it 7 * Deliantra is free software: you can redistribute it and/or modify it under
8 * under the terms of the GNU General Public License as published by the Free 8 * the terms of the Affero GNU General Public License as published by the
9 * Software Foundation; either version 2 of the License, or (at your option) 9 * Free Software Foundation, either version 3 of the License, or (at your
10 * any later version. 10 * 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 Affero GNU General Public License
18 * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51 18 * and the GNU General Public License along with this program. If not, see
19 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 * <http://www.gnu.org/licenses/>.
20 * 20 *
21 * 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>
22 */ 22 */
23 23
24using namespace std; 24using namespace std;
25 25
26#include <global.h> 26#include <global.h>
… …
32# include <sys/socket.h> 32# include <sys/socket.h>
33# include <netinet/in.h> 33# include <netinet/in.h>
34# include <netinet/tcp.h> 34# include <netinet/tcp.h>
35#endif 35#endif
36 36
37// disconnect a socket after this many seconds without an ack
38#define SOCKET_TIMEOUT 8.
39
40// force a packet when idle for more than this many seconds, 37// force a packet when idle for more than this many seconds,
41// forcing an ack regularly. 38// forcing an ack regularly.
42#define IDLE_PING 2. 39#define IDLE_PING 2.
43 40
44void 41void
45client::flush () 42client::flush ()
46{ 43{
47 if (destroyed ()) 44 if (destroyed ())
48 return; 45 return;
49
50#if HAVE_TCP_INFO
51 // check about once per second, spread evenly over all clients
52 // do this only when player is active
53 if (!((pticks + fd) & 7) && pl && pl->active)
54 {
55 // check time of last ack, and, if too old, kill connection
56 struct tcp_info tcpi;
57 socklen_t len = sizeof (tcpi);
58
59 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
60 {
61 if (tcpi.tcpi_snd_mss)
62 mss = tcpi.tcpi_snd_mss;
63
64 rtt = tcpi.tcpi_rtt;
65 rttvar = tcpi.tcpi_rttvar;
66
67 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
68 {
69 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
70 write_outputbuffer ();
71
72 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);
74 destroy ();
75 }
76 }
77 }
78#endif
79 46
80 /** 47 /**
81 * Writes data to socket. 48 * Writes data to socket.
82 * 49 *
83 * 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
… …
96 } 63 }
97 else 64 else
98 return; 65 return;
99 } 66 }
100 67
101 if (socket_ev.poll () & PE_W) 68 if (socket_ev.poll () & EV_WRITE)
102 return; 69 return;
103 70
104 last_send = NOW; 71 last_send = NOW;
105 write_outputbuffer (); 72 write_outputbuffer ();
106} 73}
… …
133 // just retry 100 // just retry
134 } 101 }
135 else if (errno == EAGAIN) 102 else if (errno == EAGAIN)
136 { 103 {
137 // delay till ready 104 // delay till ready
138 socket_ev.poll (socket_ev.poll () | PE_W); 105 socket_ev.poll (socket_ev.poll () | EV_WRITE);
139 socket_ev.start (); 106 socket_ev.start ();
140 return; 107 return;
141 } 108 }
142 else 109 else
143 { 110 {
… …
145 destroy (); 112 destroy ();
146 return; 113 return;
147 } 114 }
148 } 115 }
149 116
150 socket_ev.poll (socket_ev.poll () & ~PE_W); 117 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
151} 118}
152 119
153/****************************************************************************** 120/******************************************************************************
154 * 121 *
155 * Start of read routines. 122 * Start of read routines.
… …
166 if (inbuf_len >= 2 + pkt_len) 133 if (inbuf_len >= 2 + pkt_len)
167 return 2 + pkt_len; 134 return 2 + pkt_len;
168 135
169 if (inbuf_len == sizeof (inbuf)) 136 if (inbuf_len == sizeof (inbuf))
170 { 137 {
171 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);
172 destroy (); 139 destroy ();
173 return -1; 140 return -1;
174 } 141 }
175 } 142 }
176 143
… …
214 {"reply", SC(ReplyCmd) 0 }, 181 {"reply", SC(ReplyCmd) 0 },
215 {"exti", SC(ExtiCmd) 0 }, // CF+ 182 {"exti", SC(ExtiCmd) 0 }, // CF+
216 {"addme", SC(AddMeCmd) 0 }, 183 {"addme", SC(AddMeCmd) 0 },
217 {"askface", SC(AskFaceCmd) 0 }, 184 {"askface", SC(AskFaceCmd) 0 },
218 {"requestinfo", SC(RequestInfo) 0 }, 185 {"requestinfo", SC(RequestInfo) 0 },
219 {"setfacemode", SC(SetFaceMode) 0 },
220 {"setsound", SC(SetSound) 0 }, 186 {"setsound", SC(SetSound) 0 },
221 {"setup", SC(SetUp) 0 }, 187 {"setup", SC(SetUp) 0 },
222 {"version", SC(VersionCmd) 0 }, 188 {"version", SC(VersionCmd) 0 },
223 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
224 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */ 189 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
225 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
226}; 190};
227 191
228bool 192bool
229client::may_execute (const packet_type *pkt) const 193client::may_execute (const packet_type *pkt) const
230{ 194{
… …
250 { 214 {
251 data += 6; 215 data += 6;
252 len -= 6; 216 len -= 6;
253 } 217 }
254 218
255 if (len > 4 && !strncmp (data, "say " , 4)) 219 if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
256 return true; 220 if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
257 if (len > 5 && !strncmp (data, "chat ", 5)) 221 if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
258 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;
259 226
260 return false; 227 return false;
261} 228}
262 229
263void 230void
… …
270 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 237 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
271 else 238 else
272 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 239 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
273 } 240 }
274 else 241 else
275 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);
276} 243}
277 244
278bool 245bool
279client::handle_packet () 246client::handle_packet ()
280{ 247{
… …
288 pl && pl->ob ? &pl->ob->name : "[anonymous]"); 255 pl && pl->ob ? &pl->ob->name : "[anonymous]");
289 destroy (); 256 destroy ();
290 return false; 257 return false;
291 } 258 }
292 259
260 uint8_t save_byte = inbuf [pkt_len]; // rather ugly
293 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */ 261 inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
294 262
295 /* First, break out beginning word. There are at least 263 /* First, break out beginning word. There are at least
296 * a few commands that do not have any paremeters. If 264 * a few commands that do not have any paremeters. If
297 * we get such a command, don't worry about trying 265 * we get such a command, don't worry about trying
298 * to break it up. 266 * to break it up.
… …
321 289
322 goto next_packet; 290 goto next_packet;
323 } 291 }
324 292
325 // If we get here, we didn't find a valid command. 293 // If we get here, we didn't find a valid command.
326 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); 294 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
295
327next_packet: 296next_packet:
297 inbuf [pkt_len] = save_byte; // rather ugly
328 skip_packet (pkt_len); 298 skip_packet (pkt_len);
329 299
330 // input buffer has space again 300 // input buffer has space again
331 socket_ev.poll (socket_ev.poll () | PE_R); 301 socket_ev.poll (socket_ev.poll () | EV_READ);
332 302
333 return true; 303 return true;
334} 304}
335 305
336// callback called when socket is either readable or writable 306// callback called when socket is either readable or writable
337void 307void
338client::socket_cb (iow &w, int got) 308client::socket_cb (iow &w, int revents)
339{ 309{
340 //TODO remove when we have better socket cleanup logic 310 //TODO remove when we have better socket cleanup logic
341 if (destroyed ()) 311 if (destroyed ())
342 { 312 {
343 socket_ev.poll (0); 313 socket_ev.poll (0);
344 return; 314 return;
345 } 315 }
346 316
347 if (got & PE_W) 317 if (revents & EV_WRITE)
348 { 318 {
349 write_outputbuffer (); 319 write_outputbuffer ();
350 320
351 if (!outputbuffer.len) 321 if (!outputbuffer.len)
352 socket_ev.poll (socket_ev.poll () & ~PE_W); 322 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
353 } 323 }
354 324
355 if (got & PE_R) 325 if (revents & EV_READ)
356 { 326 {
357 //TODO: rate-limit tcp connection in better ways, important 327 //TODO: rate-limit tcp connection in better ways, important
358 328
359 int amount = sizeof (inbuf) - inbuf_len; 329 int amount = sizeof (inbuf) - inbuf_len;
360 330
361 if (!amount) 331 if (!amount)
362 { 332 {
363 // input buffer full 333 // input buffer full
364 socket_ev.poll (socket_ev.poll () & ~PE_R); 334 socket_ev.poll (socket_ev.poll () & ~EV_READ);
365 return; 335 return;
366 } 336 }
367 337
368 amount = read (fd, inbuf + inbuf_len, amount); 338 amount = read (fd, inbuf + inbuf_len, amount);
369 339
… …
385 } 355 }
386 else 356 else
387 { 357 {
388 inbuf_len += amount; 358 inbuf_len += amount;
389 359
390 cmd_ev.start ();
391 }
392 }
393}
394
395// called whenever we have additional commands to process
396void
397client::cmd_cb (iw &w)
398{
399 if (handle_packet ()) 360 if (handle_packet ())
400 w.start (); 361 {
401 else 362 while (handle_packet ())
402 flush (); 363 ;
364
365 flush ();
366 }
367 }
368 }
403} 369}
404 370
405/******************************************************************************* 371/*******************************************************************************
406 * 372 *
407 * Start of write related routines. 373 * Start of write related routines.
… …
463client::send_packet (packet &sl) 429client::send_packet (packet &sl)
464{ 430{
465 if (destroyed ()) 431 if (destroyed ())
466 return; 432 return;
467 433
468 if (sl.length () >= MAXSOCKBUF) 434 if (sl.length () > MAXSOCKBUF)
469 { 435 {
470 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 436 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
471 /* Almost certainly we've overflowed a buffer, so quit now to make 437 /* Almost certainly we've overflowed a buffer, so quit now to make
472 * it easier to debug. 438 * it easier to debug.
473 */ 439 */
… …
511 va_end (ap); 477 va_end (ap);
512 478
513 send_packet (sl); 479 send_packet (sl);
514} 480}
515 481
516// returns true when the message needs special (read: perl) treatment
517static bool
518msg_is_special (const char *msg)
519{
520 return msg [strcspn (msg, "<[&\n")];
521}
522
523void 482void
524client::send_msg (int color, const char *type, const char *msg) 483client::send_msg (int color, const char *type, const char *msg)
525{ 484{
485 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
486 {
487 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
488 return;
489 }
490
491 int len = strlen (msg);
492
493 if (!(color & NDI_VERBATIM)
526 if (msg_is_special (msg)) 494 && (msg_is_special (msg)
495 || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)))
527 cfperl_send_msg (this, color, type, msg); 496 cfperl_send_msg (this, color, type, msg);
528 else if (can_msg)
529 send_packet_printf ("msg %d %s %s", color, type, msg);
530 else if (color < 0)
531 return; // client cannot handle this
532 else 497 else
533 send_packet_printf ("drawinfo %d %s", color, msg); 498 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
534} 499}
535 500
536void 501void
537client::send_drawinfo (const char *msg, int flags) 502client::send_drawinfo (const char *msg, int flags)
538{ 503{

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