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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.41 by root, Fri May 18 19:46:22 2007 UTC vs.
Revision 1.63 by root, Wed Nov 14 08:09:46 2007 UTC

1/* 1/*
2 * CrossFire, A Multiplayer game 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 * 3 *
4 * Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team 4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Deliantra 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 * Deliantra 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.
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 <support@deliantra.net>
22 */
23
24/**
25 * \file
26 * Low-level socket-related functions.
27 *
28 * \date 2003-12-02
29 *
30 * Contains some base functions that both the client and server
31 * can use. As such, depending what we are being compiled for will
32 * determine what we can include. the client is designed have
33 * CFCLIENT defined as part of its compile flags.
34 */ 21 */
35 22
36using namespace std; 23using 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
53 39
54void 40void
55client::flush () 41client::flush ()
56{ 42{
57 if (destroyed ()) 43 if (destroyed ())
58 return; 44 return;
59
60#ifdef __linux__
61 // check time of last ack, and, if too old, kill connection
62 struct tcp_info tcpi;
63 socklen_t len = sizeof (tcpi);
64
65 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
66 {
67 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
68
69 rtt = tcpi.tcpi_rtt;
70 rttvar = tcpi.tcpi_rttvar;
71
72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s
73 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
74 {
75 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
76 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
77 destroy ();
78 }
79 }
80#endif
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.
54 if (!outputbuffer.len)
55 {
56 if (last_send + IDLE_PING <= NOW && pl && pl->active)
57 {
58 // this is a bit ugly, but map1/map1a seem to be the only
59 // nop'able commands and they are quite small.
60 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
61 send_packet (sl);
62 }
63 else
64 return;
65 }
66
67 if (socket_ev.poll () & EV_WRITE)
90 return; 68 return;
91 69
70 last_send = NOW;
92 write_outputbuffer (); 71 write_outputbuffer ();
93} 72}
94 73
95void 74void
96client::write_outputbuffer () 75client::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
112 cst_tot.obytes += res;
113 cst_lst.obytes += res;
114#endif
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 ();
… …
124 // just retry 99 // just retry
125 } 100 }
126 else if (errno == EAGAIN) 101 else if (errno == EAGAIN)
127 { 102 {
128 // delay till ready 103 // delay till ready
129 socket_ev.poll (socket_ev.poll () | PE_W); 104 socket_ev.poll (socket_ev.poll () | EV_WRITE);
130 socket_ev.start (); 105 socket_ev.start ();
131 return; 106 return;
132 } 107 }
133 else 108 else
134 { 109 {
… …
136 destroy (); 111 destroy ();
137 return; 112 return;
138 } 113 }
139 } 114 }
140 115
141 socket_ev.poll (socket_ev.poll () & ~PE_W); 116 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
142} 117}
143 118
144/****************************************************************************** 119/******************************************************************************
145 * 120 *
146 * Start of read routines. 121 * Start of read routines.
… …
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
… …
241 { 216 {
242 data += 6; 217 data += 6;
243 len -= 6; 218 len -= 6;
244 } 219 }
245 220
246 if (len > 4 && !strncmp (data, "say " , 4)) 221 if (len > 4 && data [3] == ' ' && !strncmp (data, "say " , 4)) return true;
247 return true; 222 if (len > 5 && data [4] == ' ' && !strncmp (data, "chat " , 5)) return true;
248 if (len > 5 && !strncmp (data, "chat ", 5)) 223 if (len > 6 && data [5] == ' ' && !strncmp (data, "shout ", 6)) return true;
249 return true; 224
225 if (len == 7 && !strcmp (data, "suicide")) return true;
250 226
251 return false; 227 return false;
252} 228}
253 229
254void 230void
… …
261 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 237 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
262 else 238 else
263 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 239 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
264 } 240 }
265 else 241 else
266 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);
267} 243}
268 244
269bool 245bool
270client::handle_packet () 246client::handle_packet ()
271{ 247{
… …
312 288
313 goto next_packet; 289 goto next_packet;
314 } 290 }
315 291
316 // If we get here, we didn't find a valid command. 292 // If we get here, we didn't find a valid command.
317 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);
318next_packet: 294next_packet:
319 skip_packet (pkt_len); 295 skip_packet (pkt_len);
320 296
321 // input buffer has space again 297 // input buffer has space again
322 socket_ev.poll (socket_ev.poll () | PE_R); 298 socket_ev.poll (socket_ev.poll () | EV_READ);
323 299
324 return true; 300 return true;
325} 301}
326 302
327// callback called when socket is either readable or writable 303// callback called when socket is either readable or writable
328void 304void
329client::socket_cb (iow &w, int got) 305client::socket_cb (iow &w, int revents)
330{ 306{
331 //TODO remove when we have better socket cleanup logic 307 //TODO remove when we have better socket cleanup logic
332 if (destroyed ()) 308 if (destroyed ())
333 { 309 {
334 socket_ev.poll (0); 310 socket_ev.poll (0);
335 return; 311 return;
336 } 312 }
337 313
338 if (got & PE_W) 314 if (revents & EV_WRITE)
339 { 315 {
340 write_outputbuffer (); 316 write_outputbuffer ();
341 317
342 if (!outputbuffer.len) 318 if (!outputbuffer.len)
343 socket_ev.poll (socket_ev.poll () & ~PE_W); 319 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
344 } 320 }
345 321
346 if (got & PE_R) 322 if (revents & EV_READ)
347 { 323 {
348 //TODO: rate-limit tcp connection in better ways, important 324 //TODO: rate-limit tcp connection in better ways, important
349 325
350 int amount = sizeof (inbuf) - inbuf_len; 326 int amount = sizeof (inbuf) - inbuf_len;
351 327
352 if (!amount) 328 if (!amount)
353 { 329 {
354 // input buffer full 330 // input buffer full
355 socket_ev.poll (socket_ev.poll () & ~PE_R); 331 socket_ev.poll (socket_ev.poll () & ~EV_READ);
356 return; 332 return;
357 } 333 }
358 334
359 amount = read (fd, inbuf + inbuf_len, amount); 335 amount = read (fd, inbuf + inbuf_len, amount);
360 336
… …
376 } 352 }
377 else 353 else
378 { 354 {
379 inbuf_len += amount; 355 inbuf_len += amount;
380 356
381 cst_tot.ibytes += amount;
382 cst_lst.ibytes += amount;
383
384 cmd_ev.start ();
385 }
386 }
387}
388
389// called whenever we have additional commands to process
390void
391client::cmd_cb (iw &w)
392{
393 if (handle_packet ()) 357 if (handle_packet ())
394 w.start (); 358 {
395 else 359 while (handle_packet ())
396 flush (); 360 ;
361
362 flush ();
363 }
364 }
365 }
397} 366}
398 367
399/******************************************************************************* 368/*******************************************************************************
400 * 369 *
401 * Start of write related routines. 370 * Start of write related routines.
… …
457client::send_packet (packet &sl) 426client::send_packet (packet &sl)
458{ 427{
459 if (destroyed ()) 428 if (destroyed ())
460 return; 429 return;
461 430
462 if (sl.length () >= MAXSOCKBUF) 431 if (sl.length () > MAXSOCKBUF)
463 { 432 {
464 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 ());
465 /* 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
466 * it easier to debug. 435 * it easier to debug.
467 */ 436 */
… …
505 va_end (ap); 474 va_end (ap);
506 475
507 send_packet (sl); 476 send_packet (sl);
508} 477}
509 478
510void 479// returns true when the message needs special (read: perl) treatment
511client::send_drawinfo (const char *msg, int flags) 480static bool
512{ 481msg_is_special (const char *msg)
513 send_packet_printf ("drawinfo %d %s", flags, msg); 482{
483 return msg [strcspn (msg, "<[&\n")];
514} 484}
515 485
516void 486void
517client::send_msg (int color, const char *type, const char *msg) 487client::send_msg (int color, const char *type, const char *msg)
518{ 488{
489 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
490 {
491 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
492 return;
493 }
494
495 int len = strlen (msg);
496
497 if (msg_is_special (msg) || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128))
498 cfperl_send_msg (this, color, type, msg);
519 if (can_msg) 499 else if (can_msg)
520 send_packet_printf ("msg %d %s %s", color, type, msg); 500 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
521 else if (color < 0) 501 else if (color < 0)
522 return; // client cannot handle this 502 return; // client cannot handle this
523 else if (strchr (msg, '<') || strchr (msg, '&'))
524 {
525 //TODO: should escape/modify to old syntax
526 send_packet_printf ("drawinfo %d %s", color, msg);
527 }
528 else 503 else
529 send_packet_printf ("drawinfo %d %s", color, msg); 504 send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
505}
506
507void
508client::send_drawinfo (const char *msg, int flags)
509{
510 send_msg (flags, "log", msg);
530} 511}
531 512
532/*********************************************************************** 513/***********************************************************************
533 * 514 *
534 * packet functions/utilities 515 * packet functions/utilities
… …
606 return reset (); 587 return reset ();
607 588
608 cur += len; 589 cur += len;
609} 590}
610 591
611/******************************************************************************
612 *
613 * statistics logging functions.
614 *
615 ******************************************************************************/
616
617#ifdef CS_LOGSTATS
618
619/* cst_tot is for the life of the server, cst_last is for the last series of
620 * stats
621 */
622CS_Stats cst_tot, cst_lst;
623
624/**
625 * Writes out the gathered stats. We clear cst_lst.
626 */
627void
628write_cs_stats (void)
629{
630 time_t now = time (NULL);
631
632 /* If no connections recently, don't both to log anything */
633 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
634 return;
635
636 /* CSSTAT is put in so scripts can easily find the line */
637 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
638 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
639 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
640 cst_lst.ibytes = 0;
641 cst_lst.obytes = 0;
642 cst_lst.time_start = now;
643}
644#endif
645

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