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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.30 by pippijn, Sat Jan 6 14:42:31 2007 UTC vs.
Revision 1.43 by root, Sat Jun 9 22:54:04 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 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 it
8 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
9 the Free Software Foundation; either version 2 of the License, or 9 * Software Foundation; either version 2 of the License, or (at your option)
10 (at your option) any later version. 10 * 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, but
13 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 GNU General Public License for more details. 15 * 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 along
18 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
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 20 *
21 The author can be reached via e-mail to mark@pyramid.com 21 * The authors can be reached via e-mail to <crossfire@schmorp.de>
22*/ 22 */
23 23
24/** 24/**
25 * \file 25 * \file
26 * Low-level socket-related functions. 26 * Low-level socket-related functions.
27 * 27 *
… …
44# include <sys/socket.h> 44# include <sys/socket.h>
45# include <netinet/in.h> 45# include <netinet/in.h>
46# include <netinet/tcp.h> 46# include <netinet/tcp.h>
47#endif 47#endif
48 48
49// use a really low timeout, as it doesn't cost any bandwidth, and you can 49// disconnect a socket after this many seconds without an ack
50// easily die in 20 seconds...
51#define SOCKET_TIMEOUT1 10 * 1000 50#define SOCKET_TIMEOUT 8.
52#define SOCKET_TIMEOUT2 20 * 1000 51
52// force a packet when idle for more than this many seconds,
53// forcing an ack regularly.
54#define IDLE_PING 2.
53 55
54void 56void
55client::flush () 57client::flush ()
56{ 58{
57 if (destroyed ()) 59 if (destroyed ())
58 return; 60 return;
59 61
60#ifdef __linux__ 62#ifdef __linux__
63 // check about once per second, spread evenly over all clients
64 if (!((pticks + fd) & 7))
65 {
61 // check time of last ack, and, if too old, kill connection 66 // check time of last ack, and, if too old, kill connection
62 struct tcp_info tcpi; 67 struct tcp_info tcpi;
63 socklen_t len = sizeof (tcpi); 68 socklen_t len = sizeof (tcpi);
64 69
65 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 70 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
66 { 71 {
67 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
68
69 rtt = tcpi.tcpi_rtt; 72 rtt = tcpi.tcpi_rtt;
70 rttvar = tcpi.tcpi_rttvar; 73 rttvar = tcpi.tcpi_rttvar;
71 74
72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s 75 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
73 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
74 { 76 {
77 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
78 write_outputbuffer ();
79
75 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 80 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); 81 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
77 destroy (); 82 destroy ();
83 }
78 } 84 }
79 } 85 }
80#endif 86#endif
81 87
82 /** 88 /**
… …
84 * 90 *
85 * When the socket is clear to write, and we have backlogged data, this 91 * When the socket is clear to write, and we have backlogged data, this
86 * is called to write it out. 92 * is called to write it out.
87 */ 93 */
88 94
89 if (!outputbuffer.len || socket_ev.poll () & PE_W) 95 // write a nop to the socket at least every IDLE_NOP seconds.
96 if (!outputbuffer.len)
97 {
98 if (last_send + IDLE_PING <= NOW)
99 {
100 // this is a bit ugly, but map1/map1a seem to be the only
101 // nop'able commands and they are quite small.
102 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
103 send_packet (sl);
104 }
105 else
106 return;
107 }
108
109 if (socket_ev.poll () & PE_W)
90 return; 110 return;
91 111
112 last_send = NOW;
92 write_outputbuffer (); 113 write_outputbuffer ();
93} 114}
94 115
95void 116void
96client::write_outputbuffer () 117client::write_outputbuffer ()
… …
106 /* wrap back to start of buffer */ 127 /* wrap back to start of buffer */
107 if (outputbuffer.start == SOCKETBUFSIZE) 128 if (outputbuffer.start == SOCKETBUFSIZE)
108 outputbuffer.start = 0; 129 outputbuffer.start = 0;
109 130
110 outputbuffer.len -= res; 131 outputbuffer.len -= res;
111#ifdef CS_LOGSTATS
112 cst_tot.obytes += res;
113 cst_lst.obytes += res;
114#endif
115 } 132 }
116 else if (res == 0) 133 else if (res == 0)
117 { 134 {
118 LOG (llevError, "socket write failed, connection closed.\n"); 135 LOG (llevError, "socket write failed, connection closed.\n");
119 destroy (); 136 destroy ();
… …
186 203
187/** 204/**
188 * Dispatch table for the server. 205 * Dispatch table for the server.
189 */ 206 */
190static struct packet_type packets[] = { 207static struct packet_type packets[] = {
191 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 208 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
192 {"command", PC(PlayerCmd) PF_PLAYING }, 209 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
193 210
194 {"examine", PC(ExamineCmd) PF_PLAYING }, 211 {"examine", PC(ExamineCmd) PF_PLAYING },
212 {"ex", PC(ExCmd) PF_PLAYING },
195 {"apply", PC(ApplyCmd) PF_PLAYING }, 213 {"apply", PC(ApplyCmd) PF_PLAYING },
196 {"lookat", PC(LookAt) PF_PLAYING }, 214 {"lookat", PC(LookAt) PF_PLAYING },
197 {"lock", PC(LockItem) PF_PLAYING }, 215 {"lock", PC(LockItem) PF_PLAYING },
198 {"mark", PC(MarkItem) PF_PLAYING }, 216 {"mark", PC(MarkItem) PF_PLAYING },
199 {"move", PC(MoveCmd) PF_PLAYING }, 217 {"move", PC(MoveCmd) PF_PLAYING },
200 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 218 {"ext", PC(ExtCmd) 0 }, // CF+
201 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 219 {"mapredraw", PC(MapRedrawCmd) 0 },
202 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 220 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
203 221
204 {"reply", SC(ReplyCmd) 0 }, 222 {"reply", SC(ReplyCmd) 0 },
205 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 223 {"exti", SC(ExtiCmd) 0 }, // CF+
206 {"addme", SC(AddMeCmd) 0 }, 224 {"addme", SC(AddMeCmd) 0 },
207 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ 225 {"askface", SC(AskFaceCmd) 0 },
208 {"requestinfo", SC(RequestInfo) 0 }, 226 {"requestinfo", SC(RequestInfo) 0 },
209 {"setfacemode", SC(SetFaceMode) 0 }, 227 {"setfacemode", SC(SetFaceMode) 0 },
210 {"setsound", SC(SetSound) 0 }, 228 {"setsound", SC(SetSound) 0 },
211 {"setup", SC(SetUp) 0 }, 229 {"setup", SC(SetUp) 0 },
212 {"version", SC(VersionCmd) 0 }, 230 {"version", SC(VersionCmd) 0 },
… …
220{ 238{
221 return (!(pkt->flags & PF_PLAYER) || pl) 239 return (!(pkt->flags & PF_PLAYER) || pl)
222 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); 240 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
223} 241}
224 242
243// HACK: some commands currently should be executed
244// even when the player is frozen. this hack detects
245// those commands. it should be folded into may_execute,
246// but kept seperate to emphasise the hack aspect, i.e.
247// do it better, then remove.
248static bool
249always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
250{
251 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
252 return false;
253
254 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
255 return false;
256
257 if (pkt->flags & PF_COMMAND6)
258 {
259 data += 6;
260 len -= 6;
261 }
262
263 if (len > 4 && !strncmp (data, "say " , 4))
264 return true;
265 if (len > 5 && !strncmp (data, "chat ", 5))
266 return true;
267
268 return false;
269}
270
225void 271void
226client::execute (const packet_type *pkt, char *data, int datalen) 272client::execute (const packet_type *pkt, char *data, int datalen)
227{ 273{
228 if (may_execute (pkt)) 274 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
229 { 275 {
230 //TODO: only one format 276 //TODO: only one format
231 if (pkt->flags & PF_PLAYER) 277 if (pkt->flags & PF_PLAYER)
232 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 278 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
233 else 279 else
… …
274 } 320 }
275 321
276 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) 322 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
277 if (!strcmp ((char *)inbuf + 2, pkt->name)) 323 if (!strcmp ((char *)inbuf + 2, pkt->name))
278 { 324 {
279 if (pkt->flags & PF_PLAYER) 325 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
280 queue_command (pkt, data, datalen); 326 queue_command (pkt, data, datalen);
281 else 327 else
282 execute (pkt, data, datalen); 328 execute (pkt, data, datalen);
283 329
284 goto next_packet; 330 goto next_packet;
… …
347 } 393 }
348 else 394 else
349 { 395 {
350 inbuf_len += amount; 396 inbuf_len += amount;
351 397
352 cst_tot.ibytes += amount;
353 cst_lst.ibytes += amount;
354
355 cmd_ev.start (); 398 cmd_ev.start ();
356 } 399 }
357 } 400 }
358} 401}
359 402
… …
381 */ 424 */
382void 425void
383client::send (void *buf_, int len) 426client::send (void *buf_, int len)
384{ 427{
385 char *buf = (char *)buf_; 428 char *buf = (char *)buf_;
386 char *pos = buf;
387 int amt = 0;
388 429
389 if (destroyed () || !buf) 430 if (destroyed () || !buf)
390 return; 431 return;
391 432
392 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 433 if (len + outputbuffer.len > SOCKETBUFSIZE)
393 { 434 {
394 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); 435 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
395 destroy (); 436 // shutdown the socket, this is safer than destroying it immediately
437 // as lots of code in the callchain might still access the map etc.
438 shutdown (fd, SHUT_RDWR);
396 return; 439 return;
397 } 440 }
398 441
399 int avail, end; 442 int avail, end;
400 443
… …
476 va_end (ap); 519 va_end (ap);
477 520
478 send_packet (sl); 521 send_packet (sl);
479} 522}
480 523
524void
525client::send_drawinfo (const char *msg, int flags)
526{
527 send_packet_printf ("drawinfo %d %s", flags, msg);
528}
529
530void
531client::send_msg (int color, const char *type, const char *msg)
532{
533 if (can_msg)
534 send_packet_printf ("msg %d %s %s", color, type, msg);
535 else if (color < 0)
536 return; // client cannot handle this
537 else if (strchr (msg, '<') || strchr (msg, '&'))
538 {
539 //TODO: should escape/modify to old syntax
540 send_packet_printf ("drawinfo %d %s", color, msg);
541 }
542 else
543 send_packet_printf ("drawinfo %d %s", color, msg);
544}
545
481/*********************************************************************** 546/***********************************************************************
482 * 547 *
483 * packet functions/utilities 548 * packet functions/utilities
484 * 549 *
485 **********************************************************************/ 550 **********************************************************************/
… …
491 int len = strlen (name); 556 int len = strlen (name);
492 memcpy (cur, name, len); cur += len; 557 memcpy (cur, name, len); cur += len;
493 *cur++ = ' '; 558 *cur++ = ' ';
494} 559}
495 560
561packet &packet::operator <<(const ber32 v)
562{
563 enum { maxlen = 32 / 7 + 1};
564 uint8 buf[maxlen];
565 uint8 *p = buf + maxlen;
566 uint32 val = v.val;
567
568 *--p = val & 0x7F;
569
570 while (val > 0x7F)
571 {
572 val >>= 7;
573 *--p = (val & 0x7F) | 0x80;
574 }
575
576 return *this << data (p, buf + maxlen - p);
577}
578
496packet &packet::operator <<(const data &v) 579packet &packet::operator <<(const data &v)
497{ 580{
498 if (room () < v.len) 581 if (room () < v.len)
499 reset (); 582 reset ();
500 else 583 else
… …
537 return reset (); 620 return reset ();
538 621
539 cur += len; 622 cur += len;
540} 623}
541 624
542/******************************************************************************
543 *
544 * statistics logging functions.
545 *
546 ******************************************************************************/
547
548#ifdef CS_LOGSTATS
549
550/* cst_tot is for the life of the server, cst_last is for the last series of
551 * stats
552 */
553CS_Stats cst_tot, cst_lst;
554
555/**
556 * Writes out the gathered stats. We clear cst_lst.
557 */
558void
559write_cs_stats (void)
560{
561 time_t now = time (NULL);
562
563 /* If no connections recently, don't both to log anything */
564 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
565 return;
566
567 /* CSSTAT is put in so scripts can easily find the line */
568 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
569 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
570 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
571 cst_lst.ibytes = 0;
572 cst_lst.obytes = 0;
573 cst_lst.time_start = now;
574}
575#endif
576

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