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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.39 by root, Mon Apr 23 19:10:17 2007 UTC vs.
Revision 1.48 by root, Sun Jun 24 04:09:29 2007 UTC

1/* 1/*
2 * CrossFire, A Multiplayer game for X-windows 2 * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game.
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 *
7 * This program is free software; you can redistribute it and/or modify
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
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
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
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 * 6 *
21 * The author can be reached via e-mail to mark@pyramid.com 7 * Crossfire TRT is free software; you can redistribute it and/or modify it
22 */ 8 * under the terms of the GNU General Public License as published by the Free
23 9 * Software Foundation; either version 2 of the License, or (at your option)
24/** 10 * any later version.
25 * \file
26 * Low-level socket-related functions.
27 * 11 *
28 * \date 2003-12-02 12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * for more details.
29 * 16 *
30 * Contains some base functions that both the client and server 17 * You should have received a copy of the GNU General Public License along
31 * can use. As such, depending what we are being compiled for will 18 * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51
32 * determine what we can include. the client is designed have 19 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
33 * CFCLIENT defined as part of its compile flags. 20 *
21 * The authors can be reached via e-mail to <crossfire@schmorp.de>
34 */ 22 */
35 23
36using namespace std; 24using namespace std;
37 25
38#include <global.h> 26#include <global.h>
39#include <sproto.h> 27#include <sproto.h>
40#include <cstdarg> 28#include <cstdarg>
41 29
42#ifdef __linux__ 30#if HAVE_TCP_INFO
43# include <sys/types.h> 31# include <sys/types.h>
44# include <sys/socket.h> 32# include <sys/socket.h>
45# include <netinet/in.h> 33# include <netinet/in.h>
46# include <netinet/tcp.h> 34# include <netinet/tcp.h>
47#endif 35#endif
48 36
49// use a really low timeout, as it doesn't cost any bandwidth, and you can 37// disconnect a socket after this many seconds without an ack
50// easily die in 20 seconds...
51#define SOCKET_TIMEOUT1 10 * 1000 38#define SOCKET_TIMEOUT 8.
52#define SOCKET_TIMEOUT2 20 * 1000 39
40// force a packet when idle for more than this many seconds,
41// forcing an ack regularly.
42#define IDLE_PING 2.
53 43
54void 44void
55client::flush () 45client::flush ()
56{ 46{
57 if (destroyed ()) 47 if (destroyed ())
58 return; 48 return;
59 49
60#ifdef __linux__ 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 {
61 // check time of last ack, and, if too old, kill connection 55 // check time of last ack, and, if too old, kill connection
62 struct tcp_info tcpi; 56 struct tcp_info tcpi;
63 socklen_t len = sizeof (tcpi); 57 socklen_t len = sizeof (tcpi);
64 58
65 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 59 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
66 { 60 {
67 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 61 if (tcpi.tcpi_snd_mss)
62 mss = tcpi.tcpi_snd_mss;
68 63
69 rtt = tcpi.tcpi_rtt; 64 rtt = tcpi.tcpi_rtt;
70 rttvar = tcpi.tcpi_rttvar; 65 rttvar = tcpi.tcpi_rttvar;
71 66
72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s 67 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
73 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
74 { 68 {
69 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
70 write_outputbuffer ();
71
75 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 72 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); 73 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
77 destroy (); 74 destroy ();
75 }
78 } 76 }
79 } 77 }
80#endif 78#endif
81 79
82 /** 80 /**
… …
84 * 82 *
85 * When the socket is clear to write, and we have backlogged data, this 83 * When the socket is clear to write, and we have backlogged data, this
86 * is called to write it out. 84 * is called to write it out.
87 */ 85 */
88 86
89 if (!outputbuffer.len || socket_ev.poll () & PE_W) 87 // write a nop to the socket at least every IDLE_NOP seconds.
88 if (!outputbuffer.len)
89 {
90 if (last_send + IDLE_PING <= NOW && pl && pl->active)
91 {
92 // this is a bit ugly, but map1/map1a seem to be the only
93 // nop'able commands and they are quite small.
94 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
95 send_packet (sl);
96 }
97 else
98 return;
99 }
100
101 if (socket_ev.poll () & PE_W)
90 return; 102 return;
91 103
104 last_send = NOW;
92 write_outputbuffer (); 105 write_outputbuffer ();
93} 106}
94 107
95void 108void
96client::write_outputbuffer () 109client::write_outputbuffer ()
… …
106 /* wrap back to start of buffer */ 119 /* wrap back to start of buffer */
107 if (outputbuffer.start == SOCKETBUFSIZE) 120 if (outputbuffer.start == SOCKETBUFSIZE)
108 outputbuffer.start = 0; 121 outputbuffer.start = 0;
109 122
110 outputbuffer.len -= res; 123 outputbuffer.len -= res;
111#ifdef CS_LOGSTATS
112 cst_tot.obytes += res;
113 cst_lst.obytes += res;
114#endif
115 } 124 }
116 else if (res == 0) 125 else if (res == 0)
117 { 126 {
118 LOG (llevError, "socket write failed, connection closed.\n"); 127 LOG (llevError, "socket write failed, connection closed.\n");
119 destroy (); 128 destroy ();
… …
376 } 385 }
377 else 386 else
378 { 387 {
379 inbuf_len += amount; 388 inbuf_len += amount;
380 389
381 cst_tot.ibytes += amount;
382 cst_lst.ibytes += amount;
383
384 cmd_ev.start (); 390 cmd_ev.start ();
385 } 391 }
386 } 392 }
387} 393}
388 394
… …
505 va_end (ap); 511 va_end (ap);
506 512
507 send_packet (sl); 513 send_packet (sl);
508} 514}
509 515
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
524client::send_msg (int color, const char *type, const char *msg)
525{
526 if (msg_is_special (msg))
527 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
533 send_packet_printf ("drawinfo %d %s", color, msg);
534}
535
510void 536void
511client::send_drawinfo (const char *msg, int flags) 537client::send_drawinfo (const char *msg, int flags)
512{ 538{
513 send_packet_printf ("drawinfo %d %s", flags, msg); 539 send_msg (flags, "log", msg);
514} 540}
515 541
516/*********************************************************************** 542/***********************************************************************
517 * 543 *
518 * packet functions/utilities 544 * packet functions/utilities
… …
590 return reset (); 616 return reset ();
591 617
592 cur += len; 618 cur += len;
593} 619}
594 620
595/******************************************************************************
596 *
597 * statistics logging functions.
598 *
599 ******************************************************************************/
600
601#ifdef CS_LOGSTATS
602
603/* cst_tot is for the life of the server, cst_last is for the last series of
604 * stats
605 */
606CS_Stats cst_tot, cst_lst;
607
608/**
609 * Writes out the gathered stats. We clear cst_lst.
610 */
611void
612write_cs_stats (void)
613{
614 time_t now = time (NULL);
615
616 /* If no connections recently, don't both to log anything */
617 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
618 return;
619
620 /* CSSTAT is put in so scripts can easily find the line */
621 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
622 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
623 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
624 cst_lst.ibytes = 0;
625 cst_lst.obytes = 0;
626 cst_lst.time_start = now;
627}
628#endif
629

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