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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.29 by root, Thu Dec 21 23:37:06 2006 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 (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
4 Copyright (C) 1992 Frank Tore Johansen 5 * Copyright (©) 1992,2007 Frank Tore Johansen
5 6 *
6 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 it
7 it under the terms of the GNU General Public License as published by 8 * under the terms of the GNU General Public License as published by the Free
8 the Free Software Foundation; either version 2 of the License, or 9 * Software Foundation; either version 2 of the License, or (at your option)
9 (at your option) any later version. 10 * any later version.
10 11 *
11 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, but
12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 GNU General Public License for more details. 15 * for more details.
15 16 *
16 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 along
17 along with this program; if not, write to the Free Software 18 * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
20 The author can be reached via e-mail to mark@pyramid.com
21*/
22
23/**
24 * \file
25 * Low-level socket-related functions.
26 * 20 *
27 * \date 2003-12-02 21 * The authors can be reached via e-mail to <crossfire@schmorp.de>
28 *
29 * Contains some base functions that both the client and server
30 * can use. As such, depending what we are being compiled for will
31 * determine what we can include. the client is designed have
32 * CFCLIENT defined as part of its compile flags.
33 */ 22 */
34 23
35using namespace std; 24using namespace std;
36 25
37#include <global.h> 26#include <global.h>
38#include <sproto.h> 27#include <sproto.h>
39#include <cstdarg> 28#include <cstdarg>
40 29
41#ifdef __linux__ 30#if HAVE_TCP_INFO
42# include <sys/types.h> 31# include <sys/types.h>
43# include <sys/socket.h> 32# include <sys/socket.h>
44# include <netinet/in.h> 33# include <netinet/in.h>
45# include <netinet/tcp.h> 34# include <netinet/tcp.h>
46#endif 35#endif
47 36
48// 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
49// easily die in 20 seconds...
50#define SOCKET_TIMEOUT1 10 * 1000 38#define SOCKET_TIMEOUT 8.
51#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.
52 43
53void 44void
54client::flush () 45client::flush ()
55{ 46{
56 if (destroyed ()) 47 if (destroyed ())
57 return; 48 return;
58 49
59#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 {
60 // check time of last ack, and, if too old, kill connection 55 // check time of last ack, and, if too old, kill connection
61 struct tcp_info tcpi; 56 struct tcp_info tcpi;
62 socklen_t len = sizeof (tcpi); 57 socklen_t len = sizeof (tcpi);
63 58
64 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))
65 { 60 {
66 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;
67 63
68 rtt = tcpi.tcpi_rtt; 64 rtt = tcpi.tcpi_rtt;
69 rttvar = tcpi.tcpi_rttvar; 65 rttvar = tcpi.tcpi_rttvar;
70 66
71 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s 67 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
72 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
73 { 68 {
69 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
70 write_outputbuffer ();
71
74 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,
75 (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);
76 destroy (); 74 destroy ();
75 }
77 } 76 }
78 } 77 }
79#endif 78#endif
80 79
81 /** 80 /**
… …
83 * 82 *
84 * 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
85 * is called to write it out. 84 * is called to write it out.
86 */ 85 */
87 86
88 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)
89 return; 102 return;
90 103
104 last_send = NOW;
91 write_outputbuffer (); 105 write_outputbuffer ();
92} 106}
93 107
94void 108void
95client::write_outputbuffer () 109client::write_outputbuffer ()
… …
105 /* wrap back to start of buffer */ 119 /* wrap back to start of buffer */
106 if (outputbuffer.start == SOCKETBUFSIZE) 120 if (outputbuffer.start == SOCKETBUFSIZE)
107 outputbuffer.start = 0; 121 outputbuffer.start = 0;
108 122
109 outputbuffer.len -= res; 123 outputbuffer.len -= res;
110#ifdef CS_LOGSTATS
111 cst_tot.obytes += res;
112 cst_lst.obytes += res;
113#endif
114 } 124 }
115 else if (res == 0) 125 else if (res == 0)
116 { 126 {
117 LOG (llevError, "socket write failed, connection closed.\n"); 127 LOG (llevError, "socket write failed, connection closed.\n");
118 destroy (); 128 destroy ();
… …
185 195
186/** 196/**
187 * Dispatch table for the server. 197 * Dispatch table for the server.
188 */ 198 */
189static struct packet_type packets[] = { 199static struct packet_type packets[] = {
190 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 200 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
191 {"command", PC(PlayerCmd) PF_PLAYING }, 201 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
192 202
193 {"examine", PC(ExamineCmd) PF_PLAYING }, 203 {"examine", PC(ExamineCmd) PF_PLAYING },
204 {"ex", PC(ExCmd) PF_PLAYING },
194 {"apply", PC(ApplyCmd) PF_PLAYING }, 205 {"apply", PC(ApplyCmd) PF_PLAYING },
195 {"lookat", PC(LookAt) PF_PLAYING }, 206 {"lookat", PC(LookAt) PF_PLAYING },
196 {"lock", PC(LockItem) PF_PLAYING }, 207 {"lock", PC(LockItem) PF_PLAYING },
197 {"mark", PC(MarkItem) PF_PLAYING }, 208 {"mark", PC(MarkItem) PF_PLAYING },
198 {"move", PC(MoveCmd) PF_PLAYING }, 209 {"move", PC(MoveCmd) PF_PLAYING },
199 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 210 {"ext", PC(ExtCmd) 0 }, // CF+
200 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 211 {"mapredraw", PC(MapRedrawCmd) 0 },
201 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 212 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
202 213
203 {"reply", SC(ReplyCmd) 0 }, 214 {"reply", SC(ReplyCmd) 0 },
204 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 215 {"exti", SC(ExtiCmd) 0 }, // CF+
205 {"addme", SC(AddMeCmd) 0 }, 216 {"addme", SC(AddMeCmd) 0 },
206 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ 217 {"askface", SC(AskFaceCmd) 0 },
207 {"requestinfo", SC(RequestInfo) 0 }, 218 {"requestinfo", SC(RequestInfo) 0 },
208 {"setfacemode", SC(SetFaceMode) 0 }, 219 {"setfacemode", SC(SetFaceMode) 0 },
209 {"setsound", SC(SetSound) 0 }, 220 {"setsound", SC(SetSound) 0 },
210 {"setup", SC(SetUp) 0 }, 221 {"setup", SC(SetUp) 0 },
211 {"version", SC(VersionCmd) 0 }, 222 {"version", SC(VersionCmd) 0 },
… …
219{ 230{
220 return (!(pkt->flags & PF_PLAYER) || pl) 231 return (!(pkt->flags & PF_PLAYER) || pl)
221 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); 232 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
222} 233}
223 234
235// HACK: some commands currently should be executed
236// even when the player is frozen. this hack detects
237// those commands. it should be folded into may_execute,
238// but kept seperate to emphasise the hack aspect, i.e.
239// do it better, then remove.
240static bool
241always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
242{
243 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
244 return false;
245
246 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
247 return false;
248
249 if (pkt->flags & PF_COMMAND6)
250 {
251 data += 6;
252 len -= 6;
253 }
254
255 if (len > 4 && !strncmp (data, "say " , 4))
256 return true;
257 if (len > 5 && !strncmp (data, "chat ", 5))
258 return true;
259
260 return false;
261}
262
224void 263void
225client::execute (const packet_type *pkt, char *data, int datalen) 264client::execute (const packet_type *pkt, char *data, int datalen)
226{ 265{
227 if (may_execute (pkt)) 266 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
228 { 267 {
229 //TODO: only one format 268 //TODO: only one format
230 if (pkt->flags & PF_PLAYER) 269 if (pkt->flags & PF_PLAYER)
231 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 270 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
232 else 271 else
… …
273 } 312 }
274 313
275 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) 314 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
276 if (!strcmp ((char *)inbuf + 2, pkt->name)) 315 if (!strcmp ((char *)inbuf + 2, pkt->name))
277 { 316 {
278 if (pkt->flags & PF_PLAYER) 317 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
279 queue_command (pkt, data, datalen); 318 queue_command (pkt, data, datalen);
280 else 319 else
281 execute (pkt, data, datalen); 320 execute (pkt, data, datalen);
282 321
283 goto next_packet; 322 goto next_packet;
… …
346 } 385 }
347 else 386 else
348 { 387 {
349 inbuf_len += amount; 388 inbuf_len += amount;
350 389
351 cst_tot.ibytes += amount;
352 cst_lst.ibytes += amount;
353
354 cmd_ev.start (); 390 cmd_ev.start ();
355 } 391 }
356 } 392 }
357} 393}
358 394
… …
380 */ 416 */
381void 417void
382client::send (void *buf_, int len) 418client::send (void *buf_, int len)
383{ 419{
384 char *buf = (char *)buf_; 420 char *buf = (char *)buf_;
385 char *pos = buf;
386 int amt = 0;
387 421
388 if (destroyed () || !buf) 422 if (destroyed () || !buf)
389 return; 423 return;
390 424
391 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 425 if (len + outputbuffer.len > SOCKETBUFSIZE)
392 { 426 {
393 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); 427 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
394 destroy (); 428 // shutdown the socket, this is safer than destroying it immediately
429 // as lots of code in the callchain might still access the map etc.
430 shutdown (fd, SHUT_RDWR);
395 return; 431 return;
396 } 432 }
397 433
398 int avail, end; 434 int avail, end;
399 435
… …
475 va_end (ap); 511 va_end (ap);
476 512
477 send_packet (sl); 513 send_packet (sl);
478} 514}
479 515
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
536void
537client::send_drawinfo (const char *msg, int flags)
538{
539 send_msg (flags, "log", msg);
540}
541
480/*********************************************************************** 542/***********************************************************************
481 * 543 *
482 * packet functions/utilities 544 * packet functions/utilities
483 * 545 *
484 **********************************************************************/ 546 **********************************************************************/
… …
490 int len = strlen (name); 552 int len = strlen (name);
491 memcpy (cur, name, len); cur += len; 553 memcpy (cur, name, len); cur += len;
492 *cur++ = ' '; 554 *cur++ = ' ';
493} 555}
494 556
557packet &packet::operator <<(const ber32 v)
558{
559 enum { maxlen = 32 / 7 + 1};
560 uint8 buf[maxlen];
561 uint8 *p = buf + maxlen;
562 uint32 val = v.val;
563
564 *--p = val & 0x7F;
565
566 while (val > 0x7F)
567 {
568 val >>= 7;
569 *--p = (val & 0x7F) | 0x80;
570 }
571
572 return *this << data (p, buf + maxlen - p);
573}
574
495packet &packet::operator <<(const data &v) 575packet &packet::operator <<(const data &v)
496{ 576{
497 if (room () < v.len) 577 if (room () < v.len)
498 reset (); 578 reset ();
499 else 579 else
… …
536 return reset (); 616 return reset ();
537 617
538 cur += len; 618 cur += len;
539} 619}
540 620
541/******************************************************************************
542 *
543 * statistics logging functions.
544 *
545 ******************************************************************************/
546
547#ifdef CS_LOGSTATS
548
549/* cst_tot is for the life of the server, cst_last is for the last series of
550 * stats
551 */
552CS_Stats cst_tot, cst_lst;
553
554/**
555 * Writes out the gathered stats. We clear cst_lst.
556 */
557void
558write_cs_stats (void)
559{
560 time_t now = time (NULL);
561
562 /* If no connections recently, don't both to log anything */
563 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
564 return;
565
566 /* CSSTAT is put in so scripts can easily find the line */
567 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
568 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
569 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
570 cst_lst.ibytes = 0;
571 cst_lst.obytes = 0;
572 cst_lst.time_start = now;
573}
574#endif
575

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