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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.40 by root, Tue Apr 24 00:42:03 2007 UTC vs.
Revision 1.55 by root, Sun Jul 29 13:36:40 2007 UTC

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.
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 */
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// disconnect a socket after this many seconds without an ack
50// easily die in 20 seconds...
51#define SOCKET_TIMEOUT1 10 * 1000 37#define SOCKET_TIMEOUT 8.
52#define SOCKET_TIMEOUT2 20 * 1000 38
39// force a packet when idle for more than this many seconds,
40// forcing an ack regularly.
41#define IDLE_PING 2.
53 42
54void 43void
55client::flush () 44client::flush ()
56{ 45{
57 if (destroyed ()) 46 if (destroyed ())
58 return; 47 return;
59 48
60#ifdef __linux__ 49#if HAVE_TCP_INFO
61 // check time of last ack, and, if too old, kill connection 50 // check time of last ack, and, if too old, kill connection
62 struct tcp_info tcpi;
63 socklen_t len = sizeof (tcpi); 51 socklen_t len = sizeof (tcpi);
64 52
65 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 53 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
66 { 54 {
67 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 55 if (tcpi.tcpi_snd_mss)
56 mss = tcpi.tcpi_snd_mss;
68 57
69 rtt = tcpi.tcpi_rtt; 58#if 0
70 rttvar = tcpi.tcpi_rttvar; 59 fprintf (stderr, "uack %d ack %d lost %d ret %d fack %d sst %d cwnd %d mss %d pmtu %d advmss %d EXC %d\n",
60 tcpi.tcpi_unacked,
61 tcpi.tcpi_sacked,
62 tcpi.tcpi_lost,
63 tcpi.tcpi_retrans,
64 tcpi.tcpi_fackets,
65 tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu, tcpi.tcpi_advmss,
66
67 tcpi.tcpi_snd_cwnd - (tcpi.tcpi_unacked - tcpi.tcpi_sacked));
68#endif
71 69
72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s 70 // do this only when player is active
73 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s 71 if (pl && pl->active
72 && tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
74 { 73 {
74 send_msg (NDI_RED | NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
75 write_outputbuffer ();
76
75 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 77 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); 78 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
77 destroy (); 79 destroy ();
78 } 80 }
79 } 81 }
80#endif 82#endif
81 83
… …
84 * 86 *
85 * When the socket is clear to write, and we have backlogged data, this 87 * When the socket is clear to write, and we have backlogged data, this
86 * is called to write it out. 88 * is called to write it out.
87 */ 89 */
88 90
89 if (!outputbuffer.len || socket_ev.poll () & PE_W) 91 // write a nop to the socket at least every IDLE_NOP seconds.
92 if (!outputbuffer.len)
93 {
94 if (last_send + IDLE_PING <= NOW && pl && pl->active)
95 {
96 // this is a bit ugly, but map1/map1a seem to be the only
97 // nop'able commands and they are quite small.
98 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
99 send_packet (sl);
100 }
101 else
102 return;
103 }
104
105 if (socket_ev.poll () & PE_W)
90 return; 106 return;
91 107
108 last_send = NOW;
92 write_outputbuffer (); 109 write_outputbuffer ();
93} 110}
94 111
95void 112void
96client::write_outputbuffer () 113client::write_outputbuffer ()
… …
106 /* wrap back to start of buffer */ 123 /* wrap back to start of buffer */
107 if (outputbuffer.start == SOCKETBUFSIZE) 124 if (outputbuffer.start == SOCKETBUFSIZE)
108 outputbuffer.start = 0; 125 outputbuffer.start = 0;
109 126
110 outputbuffer.len -= res; 127 outputbuffer.len -= res;
111#ifdef CS_LOGSTATS
112 cst_tot.obytes += res;
113 cst_lst.obytes += res;
114#endif
115 } 128 }
116 else if (res == 0) 129 else if (res == 0)
117 { 130 {
118 LOG (llevError, "socket write failed, connection closed.\n"); 131 LOG (llevError, "socket write failed, connection closed.\n");
119 destroy (); 132 destroy ();
… …
157 if (inbuf_len >= 2 + pkt_len) 170 if (inbuf_len >= 2 + pkt_len)
158 return 2 + pkt_len; 171 return 2 + pkt_len;
159 172
160 if (inbuf_len == sizeof (inbuf)) 173 if (inbuf_len == sizeof (inbuf))
161 { 174 {
162 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED); 175 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY);
163 destroy (); 176 destroy ();
164 return -1; 177 return -1;
165 } 178 }
166 } 179 }
167 180
… …
261 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 274 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
262 else 275 else
263 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 276 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
264 } 277 }
265 else 278 else
266 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); 279 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
267} 280}
268 281
269bool 282bool
270client::handle_packet () 283client::handle_packet ()
271{ 284{
… …
312 325
313 goto next_packet; 326 goto next_packet;
314 } 327 }
315 328
316 // If we get here, we didn't find a valid command. 329 // 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); 330 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
318next_packet: 331next_packet:
319 skip_packet (pkt_len); 332 skip_packet (pkt_len);
320 333
321 // input buffer has space again 334 // input buffer has space again
322 socket_ev.poll (socket_ev.poll () | PE_R); 335 socket_ev.poll (socket_ev.poll () | PE_R);
… …
375 // should not be here, normally 388 // should not be here, normally
376 } 389 }
377 else 390 else
378 { 391 {
379 inbuf_len += amount; 392 inbuf_len += amount;
380
381 cst_tot.ibytes += amount;
382 cst_lst.ibytes += amount;
383 393
384 cmd_ev.start (); 394 cmd_ev.start ();
385 } 395 }
386 } 396 }
387} 397}
… …
457client::send_packet (packet &sl) 467client::send_packet (packet &sl)
458{ 468{
459 if (destroyed ()) 469 if (destroyed ())
460 return; 470 return;
461 471
462 if (sl.length () >= MAXSOCKBUF) 472 if (sl.length () > MAXSOCKBUF)
463 { 473 {
464 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 474 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 475 /* Almost certainly we've overflowed a buffer, so quit now to make
466 * it easier to debug. 476 * it easier to debug.
467 */ 477 */
… …
505 va_end (ap); 515 va_end (ap);
506 516
507 send_packet (sl); 517 send_packet (sl);
508} 518}
509 519
510void 520// returns true when the message needs special (read: perl) treatment
511client::send_drawinfo (const char *msg, int flags) 521static bool
512{ 522msg_is_special (const char *msg)
513 send_packet_printf ("drawinfo %d %s", flags, msg); 523{
524 return msg [strcspn (msg, "<[&\n")];
514} 525}
515 526
516void 527void
517client::send_msg (int color, const char *type, const char *msg) 528client::send_msg (int color, const char *type, const char *msg)
518{ 529{
530 if (msg_is_special (msg))
531 cfperl_send_msg (this, color, type, msg);
519 if (can_msg) 532 else if (can_msg)
520 send_packet_printf ("msg %d %s %s", color, type, msg); 533 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
521 else if (color < 0) 534 else if (color < 0)
522 return; // client cannot handle this 535 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 536 else
529 send_packet_printf ("drawinfo %d %s", color, msg); 537 send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
538}
539
540void
541client::send_drawinfo (const char *msg, int flags)
542{
543 send_msg (flags, "log", msg);
530} 544}
531 545
532/*********************************************************************** 546/***********************************************************************
533 * 547 *
534 * packet functions/utilities 548 * packet functions/utilities
… …
606 return reset (); 620 return reset ();
607 621
608 cur += len; 622 cur += len;
609} 623}
610 624
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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