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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.31 by root, Mon Jan 15 02:39:41 2007 UTC vs.
Revision 1.47 by root, Tue Jun 12 10:29:52 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
21 The author can be reached via e-mail to mark@pyramid.com
22*/
23
24/**
25 * \file
26 * Low-level socket-related functions.
27 * 20 *
28 * \date 2003-12-02 21 * The authors can be reached via e-mail to <crossfire@schmorp.de>
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 */ 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 ();
… …
186 195
187/** 196/**
188 * Dispatch table for the server. 197 * Dispatch table for the server.
189 */ 198 */
190static struct packet_type packets[] = { 199static struct packet_type packets[] = {
191 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 200 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
192 {"command", PC(PlayerCmd) PF_PLAYING }, 201 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
193 202
194 {"examine", PC(ExamineCmd) PF_PLAYING }, 203 {"examine", PC(ExamineCmd) PF_PLAYING },
204 {"ex", PC(ExCmd) PF_PLAYING },
195 {"apply", PC(ApplyCmd) PF_PLAYING }, 205 {"apply", PC(ApplyCmd) PF_PLAYING },
196 {"lookat", PC(LookAt) PF_PLAYING }, 206 {"lookat", PC(LookAt) PF_PLAYING },
197 {"lock", PC(LockItem) PF_PLAYING }, 207 {"lock", PC(LockItem) PF_PLAYING },
198 {"mark", PC(MarkItem) PF_PLAYING }, 208 {"mark", PC(MarkItem) PF_PLAYING },
199 {"move", PC(MoveCmd) PF_PLAYING }, 209 {"move", PC(MoveCmd) PF_PLAYING },
200 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 210 {"ext", PC(ExtCmd) 0 }, // CF+
201 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 211 {"mapredraw", PC(MapRedrawCmd) 0 },
202 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 212 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
203 213
204 {"reply", SC(ReplyCmd) 0 }, 214 {"reply", SC(ReplyCmd) 0 },
205 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 215 {"exti", SC(ExtiCmd) 0 }, // CF+
206 {"addme", SC(AddMeCmd) 0 }, 216 {"addme", SC(AddMeCmd) 0 },
207 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ 217 {"askface", SC(AskFaceCmd) 0 },
208 {"requestinfo", SC(RequestInfo) 0 }, 218 {"requestinfo", SC(RequestInfo) 0 },
209 {"setfacemode", SC(SetFaceMode) 0 }, 219 {"setfacemode", SC(SetFaceMode) 0 },
210 {"setsound", SC(SetSound) 0 }, 220 {"setsound", SC(SetSound) 0 },
211 {"setup", SC(SetUp) 0 }, 221 {"setup", SC(SetUp) 0 },
212 {"version", SC(VersionCmd) 0 }, 222 {"version", SC(VersionCmd) 0 },
… …
220{ 230{
221 return (!(pkt->flags & PF_PLAYER) || pl) 231 return (!(pkt->flags & PF_PLAYER) || pl)
222 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); 232 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
223} 233}
224 234
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
225void 263void
226client::execute (const packet_type *pkt, char *data, int datalen) 264client::execute (const packet_type *pkt, char *data, int datalen)
227{ 265{
228 if (may_execute (pkt)) 266 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
229 { 267 {
230 //TODO: only one format 268 //TODO: only one format
231 if (pkt->flags & PF_PLAYER) 269 if (pkt->flags & PF_PLAYER)
232 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 270 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
233 else 271 else
… …
274 } 312 }
275 313
276 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)
277 if (!strcmp ((char *)inbuf + 2, pkt->name)) 315 if (!strcmp ((char *)inbuf + 2, pkt->name))
278 { 316 {
279 if (pkt->flags & PF_PLAYER) 317 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
280 queue_command (pkt, data, datalen); 318 queue_command (pkt, data, datalen);
281 else 319 else
282 execute (pkt, data, datalen); 320 execute (pkt, data, datalen);
283 321
284 goto next_packet; 322 goto next_packet;
… …
347 } 385 }
348 else 386 else
349 { 387 {
350 inbuf_len += amount; 388 inbuf_len += amount;
351 389
352 cst_tot.ibytes += amount;
353 cst_lst.ibytes += amount;
354
355 cmd_ev.start (); 390 cmd_ev.start ();
356 } 391 }
357 } 392 }
358} 393}
359 394
… …
381 */ 416 */
382void 417void
383client::send (void *buf_, int len) 418client::send (void *buf_, int len)
384{ 419{
385 char *buf = (char *)buf_; 420 char *buf = (char *)buf_;
386 char *pos = buf;
387 int amt = 0;
388 421
389 if (destroyed () || !buf) 422 if (destroyed () || !buf)
390 return; 423 return;
391 424
392 if (len + outputbuffer.len > SOCKETBUFSIZE) 425 if (len + outputbuffer.len > SOCKETBUFSIZE)
393 { 426 {
394 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);
395 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);
396 return; 431 return;
397 } 432 }
398 433
399 int avail, end; 434 int avail, end;
400 435
… …
476 va_end (ap); 511 va_end (ap);
477 512
478 send_packet (sl); 513 send_packet (sl);
479} 514}
480 515
516void
517client::send_drawinfo (const char *msg, int flags)
518{
519 send_packet_printf ("drawinfo %d %s", flags, msg);
520}
521
522void
523client::send_msg (int color, const char *type, const char *msg)
524{
525 if (can_msg)
526 send_packet_printf ("msg %d %s %s", color, type, msg);
527 else if (color < 0)
528 return; // client cannot handle this
529 else if (strchr (msg, '<') || strchr (msg, '&'))
530 {
531 //TODO: should escape/modify to old syntax
532 send_packet_printf ("drawinfo %d %s", color, msg);
533 }
534 else
535 send_packet_printf ("drawinfo %d %s", color, msg);
536}
537
481/*********************************************************************** 538/***********************************************************************
482 * 539 *
483 * packet functions/utilities 540 * packet functions/utilities
484 * 541 *
485 **********************************************************************/ 542 **********************************************************************/
… …
491 int len = strlen (name); 548 int len = strlen (name);
492 memcpy (cur, name, len); cur += len; 549 memcpy (cur, name, len); cur += len;
493 *cur++ = ' '; 550 *cur++ = ' ';
494} 551}
495 552
553packet &packet::operator <<(const ber32 v)
554{
555 enum { maxlen = 32 / 7 + 1};
556 uint8 buf[maxlen];
557 uint8 *p = buf + maxlen;
558 uint32 val = v.val;
559
560 *--p = val & 0x7F;
561
562 while (val > 0x7F)
563 {
564 val >>= 7;
565 *--p = (val & 0x7F) | 0x80;
566 }
567
568 return *this << data (p, buf + maxlen - p);
569}
570
496packet &packet::operator <<(const data &v) 571packet &packet::operator <<(const data &v)
497{ 572{
498 if (room () < v.len) 573 if (room () < v.len)
499 reset (); 574 reset ();
500 else 575 else
… …
537 return reset (); 612 return reset ();
538 613
539 cur += len; 614 cur += len;
540} 615}
541 616
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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