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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.37 by root, Mon Apr 2 19:56:11 2007 UTC vs.
Revision 1.45 by root, Sun Jun 10 02:51:46 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 if (!((pticks + fd) & 7))
53 {
61 // check time of last ack, and, if too old, kill connection 54 // check time of last ack, and, if too old, kill connection
62 struct tcp_info tcpi; 55 struct tcp_info tcpi;
63 socklen_t len = sizeof (tcpi); 56 socklen_t len = sizeof (tcpi);
64 57
65 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 58 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
66 { 59 {
67 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
68
69 rtt = tcpi.tcpi_rtt; 60 rtt = tcpi.tcpi_rtt;
70 rttvar = tcpi.tcpi_rttvar; 61 rttvar = tcpi.tcpi_rttvar;
71 62
72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s 63 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
73 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
74 { 64 {
65 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
66 write_outputbuffer ();
67
75 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 68 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); 69 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
77 destroy (); 70 destroy ();
71 }
78 } 72 }
79 } 73 }
80#endif 74#endif
81 75
82 /** 76 /**
… …
84 * 78 *
85 * When the socket is clear to write, and we have backlogged data, this 79 * When the socket is clear to write, and we have backlogged data, this
86 * is called to write it out. 80 * is called to write it out.
87 */ 81 */
88 82
89 if (!outputbuffer.len || socket_ev.poll () & PE_W) 83 // write a nop to the socket at least every IDLE_NOP seconds.
84 if (!outputbuffer.len)
85 {
86 if (last_send + IDLE_PING <= NOW)
87 {
88 // this is a bit ugly, but map1/map1a seem to be the only
89 // nop'able commands and they are quite small.
90 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
91 send_packet (sl);
92 }
93 else
94 return;
95 }
96
97 if (socket_ev.poll () & PE_W)
90 return; 98 return;
91 99
100 last_send = NOW;
92 write_outputbuffer (); 101 write_outputbuffer ();
93} 102}
94 103
95void 104void
96client::write_outputbuffer () 105client::write_outputbuffer ()
… …
106 /* wrap back to start of buffer */ 115 /* wrap back to start of buffer */
107 if (outputbuffer.start == SOCKETBUFSIZE) 116 if (outputbuffer.start == SOCKETBUFSIZE)
108 outputbuffer.start = 0; 117 outputbuffer.start = 0;
109 118
110 outputbuffer.len -= res; 119 outputbuffer.len -= res;
111#ifdef CS_LOGSTATS
112 cst_tot.obytes += res;
113 cst_lst.obytes += res;
114#endif
115 } 120 }
116 else if (res == 0) 121 else if (res == 0)
117 { 122 {
118 LOG (llevError, "socket write failed, connection closed.\n"); 123 LOG (llevError, "socket write failed, connection closed.\n");
119 destroy (); 124 destroy ();
… …
190static struct packet_type packets[] = { 195static struct packet_type packets[] = {
191 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 }, 196 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
192 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 }, 197 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
193 198
194 {"examine", PC(ExamineCmd) PF_PLAYING }, 199 {"examine", PC(ExamineCmd) PF_PLAYING },
200 {"ex", PC(ExCmd) PF_PLAYING },
195 {"apply", PC(ApplyCmd) PF_PLAYING }, 201 {"apply", PC(ApplyCmd) PF_PLAYING },
196 {"lookat", PC(LookAt) PF_PLAYING }, 202 {"lookat", PC(LookAt) PF_PLAYING },
197 {"lock", PC(LockItem) PF_PLAYING }, 203 {"lock", PC(LockItem) PF_PLAYING },
198 {"mark", PC(MarkItem) PF_PLAYING }, 204 {"mark", PC(MarkItem) PF_PLAYING },
199 {"move", PC(MoveCmd) PF_PLAYING }, 205 {"move", PC(MoveCmd) PF_PLAYING },
200 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 206 {"ext", PC(ExtCmd) 0 }, // CF+
201 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 207 {"mapredraw", PC(MapRedrawCmd) 0 },
202 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 208 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
203 209
204 {"reply", SC(ReplyCmd) 0 }, 210 {"reply", SC(ReplyCmd) 0 },
205 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 211 {"exti", SC(ExtiCmd) 0 }, // CF+
206 {"addme", SC(AddMeCmd) 0 }, 212 {"addme", SC(AddMeCmd) 0 },
207 {"askface", SC(AskFaceCmd) 0 }, 213 {"askface", SC(AskFaceCmd) 0 },
208 {"requestinfo", SC(RequestInfo) 0 }, 214 {"requestinfo", SC(RequestInfo) 0 },
209 {"setfacemode", SC(SetFaceMode) 0 }, 215 {"setfacemode", SC(SetFaceMode) 0 },
210 {"setsound", SC(SetSound) 0 }, 216 {"setsound", SC(SetSound) 0 },
… …
375 } 381 }
376 else 382 else
377 { 383 {
378 inbuf_len += amount; 384 inbuf_len += amount;
379 385
380 cst_tot.ibytes += amount;
381 cst_lst.ibytes += amount;
382
383 cmd_ev.start (); 386 cmd_ev.start ();
384 } 387 }
385 } 388 }
386} 389}
387 390
… …
510client::send_drawinfo (const char *msg, int flags) 513client::send_drawinfo (const char *msg, int flags)
511{ 514{
512 send_packet_printf ("drawinfo %d %s", flags, msg); 515 send_packet_printf ("drawinfo %d %s", flags, msg);
513} 516}
514 517
518void
519client::send_msg (int color, const char *type, const char *msg)
520{
521 if (can_msg)
522 send_packet_printf ("msg %d %s %s", color, type, msg);
523 else if (color < 0)
524 return; // client cannot handle this
525 else if (strchr (msg, '<') || strchr (msg, '&'))
526 {
527 //TODO: should escape/modify to old syntax
528 send_packet_printf ("drawinfo %d %s", color, msg);
529 }
530 else
531 send_packet_printf ("drawinfo %d %s", color, msg);
532}
533
515/*********************************************************************** 534/***********************************************************************
516 * 535 *
517 * packet functions/utilities 536 * packet functions/utilities
518 * 537 *
519 **********************************************************************/ 538 **********************************************************************/
… …
532 enum { maxlen = 32 / 7 + 1}; 551 enum { maxlen = 32 / 7 + 1};
533 uint8 buf[maxlen]; 552 uint8 buf[maxlen];
534 uint8 *p = buf + maxlen; 553 uint8 *p = buf + maxlen;
535 uint32 val = v.val; 554 uint32 val = v.val;
536 555
556 *--p = val & 0x7F;
557
537 while (val > 0x7F) 558 while (val > 0x7F)
538 { 559 {
560 val >>= 7;
539 *--p = (val & 0x7F) | 0x80; 561 *--p = (val & 0x7F) | 0x80;
540 val >>= 7;
541 } 562 }
542
543 *--p = val;
544 563
545 return *this << data (p, buf + maxlen - p); 564 return *this << data (p, buf + maxlen - p);
546} 565}
547 566
548packet &packet::operator <<(const data &v) 567packet &packet::operator <<(const data &v)
… …
589 return reset (); 608 return reset ();
590 609
591 cur += len; 610 cur += len;
592} 611}
593 612
594/******************************************************************************
595 *
596 * statistics logging functions.
597 *
598 ******************************************************************************/
599
600#ifdef CS_LOGSTATS
601
602/* cst_tot is for the life of the server, cst_last is for the last series of
603 * stats
604 */
605CS_Stats cst_tot, cst_lst;
606
607/**
608 * Writes out the gathered stats. We clear cst_lst.
609 */
610void
611write_cs_stats (void)
612{
613 time_t now = time (NULL);
614
615 /* If no connections recently, don't both to log anything */
616 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
617 return;
618
619 /* CSSTAT is put in so scripts can easily find the line */
620 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
621 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
622 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
623 cst_lst.ibytes = 0;
624 cst_lst.obytes = 0;
625 cst_lst.time_start = now;
626}
627#endif
628

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