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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.47 by root, Tue Jun 12 10:29:52 2007 UTC vs.
Revision 1.65 by root, Thu May 8 20:03:50 2008 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
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
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 <support@deliantra.net>
22 */ 21 */
23 22
24using namespace std; 23using namespace std;
25 24
26#include <global.h> 25#include <global.h>
… …
32# include <sys/socket.h> 31# include <sys/socket.h>
33# include <netinet/in.h> 32# include <netinet/in.h>
34# include <netinet/tcp.h> 33# include <netinet/tcp.h>
35#endif 34#endif
36 35
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, 36// force a packet when idle for more than this many seconds,
41// forcing an ack regularly. 37// forcing an ack regularly.
42#define IDLE_PING 2. 38#define IDLE_PING 2.
43 39
44void 40void
45client::flush () 41client::flush ()
46{ 42{
47 if (destroyed ()) 43 if (destroyed ())
48 return; 44 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 45
80 /** 46 /**
81 * Writes data to socket. 47 * Writes data to socket.
82 * 48 *
83 * 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
… …
96 } 62 }
97 else 63 else
98 return; 64 return;
99 } 65 }
100 66
101 if (socket_ev.poll () & PE_W) 67 if (socket_ev.poll () & EV_WRITE)
102 return; 68 return;
103 69
104 last_send = NOW; 70 last_send = NOW;
105 write_outputbuffer (); 71 write_outputbuffer ();
106} 72}
… …
133 // just retry 99 // just retry
134 } 100 }
135 else if (errno == EAGAIN) 101 else if (errno == EAGAIN)
136 { 102 {
137 // delay till ready 103 // delay till ready
138 socket_ev.poll (socket_ev.poll () | PE_W); 104 socket_ev.poll (socket_ev.poll () | EV_WRITE);
139 socket_ev.start (); 105 socket_ev.start ();
140 return; 106 return;
141 } 107 }
142 else 108 else
143 { 109 {
… …
145 destroy (); 111 destroy ();
146 return; 112 return;
147 } 113 }
148 } 114 }
149 115
150 socket_ev.poll (socket_ev.poll () & ~PE_W); 116 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
151} 117}
152 118
153/****************************************************************************** 119/******************************************************************************
154 * 120 *
155 * Start of read routines. 121 * Start of read routines.
… …
166 if (inbuf_len >= 2 + pkt_len) 132 if (inbuf_len >= 2 + pkt_len)
167 return 2 + pkt_len; 133 return 2 + pkt_len;
168 134
169 if (inbuf_len == sizeof (inbuf)) 135 if (inbuf_len == sizeof (inbuf))
170 { 136 {
171 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);
172 destroy (); 138 destroy ();
173 return -1; 139 return -1;
174 } 140 }
175 } 141 }
176 142
… …
250 { 216 {
251 data += 6; 217 data += 6;
252 len -= 6; 218 len -= 6;
253 } 219 }
254 220
255 if (len > 4 && !strncmp (data, "say " , 4)) 221 if (len > 4 && data [3] == ' ' && !strncmp (data, "say " , 4)) return true;
256 return true; 222 if (len > 5 && data [4] == ' ' && !strncmp (data, "chat " , 5)) return true;
257 if (len > 5 && !strncmp (data, "chat ", 5)) 223 if (len > 6 && data [5] == ' ' && !strncmp (data, "shout ", 6)) return true;
258 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{
… …
321 288
322 goto next_packet; 289 goto next_packet;
323 } 290 }
324 291
325 // If we get here, we didn't find a valid command. 292 // 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); 293 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
327next_packet: 294next_packet:
328 skip_packet (pkt_len); 295 skip_packet (pkt_len);
329 296
330 // input buffer has space again 297 // input buffer has space again
331 socket_ev.poll (socket_ev.poll () | PE_R); 298 socket_ev.poll (socket_ev.poll () | EV_READ);
332 299
333 return true; 300 return true;
334} 301}
335 302
336// callback called when socket is either readable or writable 303// callback called when socket is either readable or writable
337void 304void
338client::socket_cb (iow &w, int got) 305client::socket_cb (iow &w, int revents)
339{ 306{
340 //TODO remove when we have better socket cleanup logic 307 //TODO remove when we have better socket cleanup logic
341 if (destroyed ()) 308 if (destroyed ())
342 { 309 {
343 socket_ev.poll (0); 310 socket_ev.poll (0);
344 return; 311 return;
345 } 312 }
346 313
347 if (got & PE_W) 314 if (revents & EV_WRITE)
348 { 315 {
349 write_outputbuffer (); 316 write_outputbuffer ();
350 317
351 if (!outputbuffer.len) 318 if (!outputbuffer.len)
352 socket_ev.poll (socket_ev.poll () & ~PE_W); 319 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
353 } 320 }
354 321
355 if (got & PE_R) 322 if (revents & EV_READ)
356 { 323 {
357 //TODO: rate-limit tcp connection in better ways, important 324 //TODO: rate-limit tcp connection in better ways, important
358 325
359 int amount = sizeof (inbuf) - inbuf_len; 326 int amount = sizeof (inbuf) - inbuf_len;
360 327
361 if (!amount) 328 if (!amount)
362 { 329 {
363 // input buffer full 330 // input buffer full
364 socket_ev.poll (socket_ev.poll () & ~PE_R); 331 socket_ev.poll (socket_ev.poll () & ~EV_READ);
365 return; 332 return;
366 } 333 }
367 334
368 amount = read (fd, inbuf + inbuf_len, amount); 335 amount = read (fd, inbuf + inbuf_len, amount);
369 336
… …
385 } 352 }
386 else 353 else
387 { 354 {
388 inbuf_len += amount; 355 inbuf_len += amount;
389 356
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 ()) 357 if (handle_packet ())
400 w.start (); 358 {
401 else 359 while (handle_packet ())
402 flush (); 360 ;
361
362 flush ();
363 }
364 }
365 }
403} 366}
404 367
405/******************************************************************************* 368/*******************************************************************************
406 * 369 *
407 * Start of write related routines. 370 * Start of write related routines.
… …
463client::send_packet (packet &sl) 426client::send_packet (packet &sl)
464{ 427{
465 if (destroyed ()) 428 if (destroyed ())
466 return; 429 return;
467 430
468 if (sl.length () >= MAXSOCKBUF) 431 if (sl.length () > MAXSOCKBUF)
469 { 432 {
470 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 ());
471 /* 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
472 * it easier to debug. 435 * it easier to debug.
473 */ 436 */
… …
512 475
513 send_packet (sl); 476 send_packet (sl);
514} 477}
515 478
516void 479void
517client::send_drawinfo (const char *msg, int flags)
518{
519 send_packet_printf ("drawinfo %d %s", flags, msg);
520}
521
522void
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 (msg_is_special (msg) || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128))
491 cfperl_send_msg (this, color, type, msg);
525 if (can_msg) 492 else if (can_msg)
526 send_packet_printf ("msg %d %s %s", color, type, msg); 493 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
527 else if (color < 0) 494 else if (color < 0)
528 return; // client cannot handle this 495 return; // client cannot handle this
529 else if (strchr (msg, '<') || strchr (msg, '&'))
530 {
531 //TODO: should escape/modify to old syntax
532 send_packet_printf ("drawinfo %d %s", color, msg);
533 }
534 else 496 else
535 send_packet_printf ("drawinfo %d %s", color, msg); 497 send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
498}
499
500void
501client::send_drawinfo (const char *msg, int flags)
502{
503 send_msg (flags, "log", msg);
536} 504}
537 505
538/*********************************************************************** 506/***********************************************************************
539 * 507 *
540 * packet functions/utilities 508 * packet functions/utilities

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