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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.34 by pippijn, Thu Mar 1 12:28:17 2007 UTC vs.
Revision 1.51 by root, Sat Jul 28 00:15:03 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
50 // check about once per second, spread evenly over all clients
51 // do this only when player is active
52 if (!((pticks + fd) & 7) && pl && pl->active)
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;
63 socklen_t len = sizeof (tcpi); 55 socklen_t len = sizeof (tcpi);
64 56
65 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 57 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
66 { 58 {
67 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 59 if (tcpi.tcpi_snd_mss)
60 mss = tcpi.tcpi_snd_mss;
68 61
69 rtt = tcpi.tcpi_rtt; 62 fprintf (stderr, "uack %d sst %d cwnd %d mss %d pmtu %d\n",
70 rttvar = tcpi.tcpi_rttvar; 63 tcpi.tcpi_unacked, tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu);
71 64
72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s 65 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
73 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
74 { 66 {
67 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
68 write_outputbuffer ();
69
75 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 70 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); 71 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
77 destroy (); 72 destroy ();
73 }
78 } 74 }
79 } 75 }
80#endif 76#endif
81 77
82 /** 78 /**
… …
84 * 80 *
85 * When the socket is clear to write, and we have backlogged data, this 81 * When the socket is clear to write, and we have backlogged data, this
86 * is called to write it out. 82 * is called to write it out.
87 */ 83 */
88 84
89 if (!outputbuffer.len || socket_ev.poll () & PE_W) 85 // write a nop to the socket at least every IDLE_NOP seconds.
86 if (!outputbuffer.len)
87 {
88 if (last_send + IDLE_PING <= NOW && pl && pl->active)
89 {
90 // this is a bit ugly, but map1/map1a seem to be the only
91 // nop'able commands and they are quite small.
92 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
93 send_packet (sl);
94 }
95 else
96 return;
97 }
98
99 if (socket_ev.poll () & PE_W)
90 return; 100 return;
91 101
102 last_send = NOW;
92 write_outputbuffer (); 103 write_outputbuffer ();
93} 104}
94 105
95void 106void
96client::write_outputbuffer () 107client::write_outputbuffer ()
… …
106 /* wrap back to start of buffer */ 117 /* wrap back to start of buffer */
107 if (outputbuffer.start == SOCKETBUFSIZE) 118 if (outputbuffer.start == SOCKETBUFSIZE)
108 outputbuffer.start = 0; 119 outputbuffer.start = 0;
109 120
110 outputbuffer.len -= res; 121 outputbuffer.len -= res;
111#ifdef CS_LOGSTATS
112 cst_tot.obytes += res;
113 cst_lst.obytes += res;
114#endif
115 } 122 }
116 else if (res == 0) 123 else if (res == 0)
117 { 124 {
118 LOG (llevError, "socket write failed, connection closed.\n"); 125 LOG (llevError, "socket write failed, connection closed.\n");
119 destroy (); 126 destroy ();
… …
190static struct packet_type packets[] = { 197static struct packet_type packets[] = {
191 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 }, 198 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
192 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 }, 199 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
193 200
194 {"examine", PC(ExamineCmd) PF_PLAYING }, 201 {"examine", PC(ExamineCmd) PF_PLAYING },
202 {"ex", PC(ExCmd) PF_PLAYING },
195 {"apply", PC(ApplyCmd) PF_PLAYING }, 203 {"apply", PC(ApplyCmd) PF_PLAYING },
196 {"lookat", PC(LookAt) PF_PLAYING }, 204 {"lookat", PC(LookAt) PF_PLAYING },
197 {"lock", PC(LockItem) PF_PLAYING }, 205 {"lock", PC(LockItem) PF_PLAYING },
198 {"mark", PC(MarkItem) PF_PLAYING }, 206 {"mark", PC(MarkItem) PF_PLAYING },
199 {"move", PC(MoveCmd) PF_PLAYING }, 207 {"move", PC(MoveCmd) PF_PLAYING },
200 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 208 {"ext", PC(ExtCmd) 0 }, // CF+
201 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 209 {"mapredraw", PC(MapRedrawCmd) 0 },
202 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 210 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
203 211
204 {"reply", SC(ReplyCmd) 0 }, 212 {"reply", SC(ReplyCmd) 0 },
205 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 213 {"exti", SC(ExtiCmd) 0 }, // CF+
206 {"addme", SC(AddMeCmd) 0 }, 214 {"addme", SC(AddMeCmd) 0 },
207 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ 215 {"askface", SC(AskFaceCmd) 0 },
208 {"requestinfo", SC(RequestInfo) 0 }, 216 {"requestinfo", SC(RequestInfo) 0 },
209 {"setfacemode", SC(SetFaceMode) 0 }, 217 {"setfacemode", SC(SetFaceMode) 0 },
210 {"setsound", SC(SetSound) 0 }, 218 {"setsound", SC(SetSound) 0 },
211 {"setup", SC(SetUp) 0 }, 219 {"setup", SC(SetUp) 0 },
212 {"version", SC(VersionCmd) 0 }, 220 {"version", SC(VersionCmd) 0 },
… …
375 } 383 }
376 else 384 else
377 { 385 {
378 inbuf_len += amount; 386 inbuf_len += amount;
379 387
380 cst_tot.ibytes += amount;
381 cst_lst.ibytes += amount;
382
383 cmd_ev.start (); 388 cmd_ev.start ();
384 } 389 }
385 } 390 }
386} 391}
387 392
… …
416 return; 421 return;
417 422
418 if (len + outputbuffer.len > SOCKETBUFSIZE) 423 if (len + outputbuffer.len > SOCKETBUFSIZE)
419 { 424 {
420 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); 425 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
421 destroy (); 426 // shutdown the socket, this is safer than destroying it immediately
427 // as lots of code in the callchain might still access the map etc.
428 shutdown (fd, SHUT_RDWR);
422 return; 429 return;
423 } 430 }
424 431
425 int avail, end; 432 int avail, end;
426 433
… …
502 va_end (ap); 509 va_end (ap);
503 510
504 send_packet (sl); 511 send_packet (sl);
505} 512}
506 513
514// returns true when the message needs special (read: perl) treatment
515static bool
516msg_is_special (const char *msg)
517{
518 return msg [strcspn (msg, "<[&\n")];
519}
520
521void
522client::send_msg (int color, const char *type, const char *msg)
523{
524 if (msg_is_special (msg))
525 cfperl_send_msg (this, color, type, msg);
526 else if (can_msg)
527 send_packet_printf ("msg %d %s %s", color, type, msg);
528 else if (color < 0)
529 return; // client cannot handle this
530 else
531 send_packet_printf ("drawinfo %d %s", color, msg);
532}
533
534void
535client::send_drawinfo (const char *msg, int flags)
536{
537 send_msg (flags, "log", msg);
538}
539
507/*********************************************************************** 540/***********************************************************************
508 * 541 *
509 * packet functions/utilities 542 * packet functions/utilities
510 * 543 *
511 **********************************************************************/ 544 **********************************************************************/
… …
517 int len = strlen (name); 550 int len = strlen (name);
518 memcpy (cur, name, len); cur += len; 551 memcpy (cur, name, len); cur += len;
519 *cur++ = ' '; 552 *cur++ = ' ';
520} 553}
521 554
555packet &packet::operator <<(const ber32 v)
556{
557 enum { maxlen = 32 / 7 + 1};
558 uint8 buf[maxlen];
559 uint8 *p = buf + maxlen;
560 uint32 val = v.val;
561
562 *--p = val & 0x7F;
563
564 while (val > 0x7F)
565 {
566 val >>= 7;
567 *--p = (val & 0x7F) | 0x80;
568 }
569
570 return *this << data (p, buf + maxlen - p);
571}
572
522packet &packet::operator <<(const data &v) 573packet &packet::operator <<(const data &v)
523{ 574{
524 if (room () < v.len) 575 if (room () < v.len)
525 reset (); 576 reset ();
526 else 577 else
… …
563 return reset (); 614 return reset ();
564 615
565 cur += len; 616 cur += len;
566} 617}
567 618
568/******************************************************************************
569 *
570 * statistics logging functions.
571 *
572 ******************************************************************************/
573
574#ifdef CS_LOGSTATS
575
576/* cst_tot is for the life of the server, cst_last is for the last series of
577 * stats
578 */
579CS_Stats cst_tot, cst_lst;
580
581/**
582 * Writes out the gathered stats. We clear cst_lst.
583 */
584void
585write_cs_stats (void)
586{
587 time_t now = time (NULL);
588
589 /* If no connections recently, don't both to log anything */
590 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
591 return;
592
593 /* CSSTAT is put in so scripts can easily find the line */
594 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
595 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
596 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
597 cst_lst.ibytes = 0;
598 cst_lst.obytes = 0;
599 cst_lst.time_start = now;
600}
601#endif
602

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