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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.23 by root, Sat Dec 16 03:08:26 2006 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 (©) 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# define TCP_HZ 1000 // sorry...
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 38#define SOCKET_TIMEOUT 8.
52#define SOCKET_TIMEOUT2 20 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#ifdef __linux__ 47 if (destroyed ())
48 return;
49
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 {
58 // check time of last ack, and, if too old, kill connection 55 // check time of last ack, and, if too old, kill connection
59 struct tcp_info tcpi; 56 struct tcp_info tcpi;
60 socklen_t len = sizeof (tcpi); 57 socklen_t len = sizeof (tcpi);
61 58
62 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))
63 { 60 {
64 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;
65 63
66 rtt = tcpi.tcpi_rtt; 64 rtt = tcpi.tcpi_rtt;
67 rttvar = tcpi.tcpi_rttvar; 65 rttvar = tcpi.tcpi_rttvar;
68 66
69 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 67 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
70 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
71 { 68 {
69 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
70 write_outputbuffer ();
71
72 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,
73 (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);
74 destroy (); 74 destroy ();
75 }
75 } 76 }
76 } 77 }
77#endif 78#endif
78 79
79 /** 80 /**
… …
81 * 82 *
82 * 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
83 * is called to write it out. 84 * is called to write it out.
84 */ 85 */
85 86
86 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)
87 return; 102 return;
88 103
104 last_send = NOW;
89 write_outputbuffer (); 105 write_outputbuffer ();
90} 106}
91 107
92void 108void
93client::write_outputbuffer () 109client::write_outputbuffer ()
… …
103 /* wrap back to start of buffer */ 119 /* wrap back to start of buffer */
104 if (outputbuffer.start == SOCKETBUFSIZE) 120 if (outputbuffer.start == SOCKETBUFSIZE)
105 outputbuffer.start = 0; 121 outputbuffer.start = 0;
106 122
107 outputbuffer.len -= res; 123 outputbuffer.len -= res;
108#ifdef CS_LOGSTATS
109 cst_tot.obytes += res;
110 cst_lst.obytes += res;
111#endif
112 } 124 }
113 else if (res == 0) 125 else if (res == 0)
114 { 126 {
115 LOG (llevError, "socket write failed, connection closed.\n"); 127 LOG (llevError, "socket write failed, connection closed.\n");
116 destroy (); 128 destroy ();
… …
183 195
184/** 196/**
185 * Dispatch table for the server. 197 * Dispatch table for the server.
186 */ 198 */
187static struct packet_type packets[] = { 199static struct packet_type packets[] = {
188 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 200 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
189 {"command", PC(PlayerCmd) PF_PLAYING }, 201 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
190 202
191 {"examine", PC(ExamineCmd) PF_PLAYING }, 203 {"examine", PC(ExamineCmd) PF_PLAYING },
204 {"ex", PC(ExCmd) PF_PLAYING },
192 {"apply", PC(ApplyCmd) PF_PLAYING }, 205 {"apply", PC(ApplyCmd) PF_PLAYING },
193 {"reply", PC(ReplyCmd) PF_IMMEDIATE },
194 {"lookat", PC(LookAt) PF_PLAYING }, 206 {"lookat", PC(LookAt) PF_PLAYING },
195 {"lock", PC(LockItem) PF_PLAYING }, 207 {"lock", PC(LockItem) PF_PLAYING },
196 {"mark", PC(MarkItem) PF_PLAYING }, 208 {"mark", PC(MarkItem) PF_PLAYING },
197 {"move", PC(MoveCmd) PF_PLAYING }, 209 {"move", PC(MoveCmd) PF_PLAYING },
198 {"exti", PC(ExtCmd) PF_IMMEDIATE }, /* CF+ */
199 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 210 {"ext", PC(ExtCmd) 0 }, // CF+
200 {"mapredraw", PC(MapRedrawCmd) PF_IMMEDIATE }, /* Added: phil */ 211 {"mapredraw", PC(MapRedrawCmd) 0 },
201 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 212 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
202 213
214 {"reply", SC(ReplyCmd) 0 },
215 {"exti", SC(ExtiCmd) 0 }, // CF+
203 {"addme", SC(AddMeCmd) PF_IMMEDIATE }, 216 {"addme", SC(AddMeCmd) 0 },
204 {"askface", SC(SendFaceCmd) PF_IMMEDIATE }, /* Added: phil */ 217 {"askface", SC(AskFaceCmd) 0 },
205 {"requestinfo", SC(RequestInfo) PF_IMMEDIATE }, 218 {"requestinfo", SC(RequestInfo) 0 },
206 {"setfacemode", SC(SetFaceMode) PF_IMMEDIATE }, 219 {"setfacemode", SC(SetFaceMode) 0 },
207 {"setsound", SC(SetSound) PF_IMMEDIATE }, 220 {"setsound", SC(SetSound) 0 },
208 {"setup", SC(SetUp) PF_IMMEDIATE }, 221 {"setup", SC(SetUp) 0 },
209 {"version", SC(VersionCmd) PF_IMMEDIATE }, 222 {"version", SC(VersionCmd) 0 },
210 {"toggleextendedinfos", SC(ToggleExtendedInfos) PF_IMMEDIATE }, /*Added: tchize */ 223 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
211 {"toggleextendedtext", SC(ToggleExtendedText) PF_IMMEDIATE }, /*Added: tchize */ 224 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
212 {"asksmooth", SC(AskSmooth) PF_IMMEDIATE }, /*Added: tchize (smoothing technologies) */ 225 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
213}; 226};
214 227
215bool 228bool
216client::may_execute (const packet_type *pkt) const 229client::may_execute (const packet_type *pkt) const
217{ 230{
218 return (!(pkt->flags & PF_PLAYER) || pl) 231 return (!(pkt->flags & PF_PLAYER) || pl)
219 && (!(pkt->flags & PF_PLAYING) || (pl && pl->state == ST_PLAYING)); 232 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
233}
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;
220} 261}
221 262
222void 263void
223client::execute (const packet_type *pkt, char *data, int datalen) 264client::execute (const packet_type *pkt, char *data, int datalen)
224{ 265{
225 if (may_execute (pkt)) 266 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
226 { 267 {
227 //TODO: only one format 268 //TODO: only one format
228 if (pkt->flags & PF_PLAYER) 269 if (pkt->flags & PF_PLAYER)
229 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 270 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
230 else 271 else
… …
271 } 312 }
272 313
273 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)
274 if (!strcmp ((char *)inbuf + 2, pkt->name)) 315 if (!strcmp ((char *)inbuf + 2, pkt->name))
275 { 316 {
276 if (pkt->flags & PF_IMMEDIATE) 317 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
318 queue_command (pkt, data, datalen);
319 else
277 execute (pkt, data, datalen); 320 execute (pkt, data, datalen);
278 else
279 queue_command (pkt, data, datalen);
280 321
281 goto next_packet; 322 goto next_packet;
282 } 323 }
283 324
284 /* If we get here, we didn't find a valid command. Logging 325 // If we get here, we didn't find a valid command.
285 * this might be questionable, because a broken client/malicious
286 * user could certainly send a whole bunch of invalid commands.
287 */
288 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); 326 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
289next_packet: 327next_packet:
290 skip_packet (pkt_len); 328 skip_packet (pkt_len);
291 329
292 // input buffer has space again 330 // input buffer has space again
… …
298// callback called when socket is either readable or writable 336// callback called when socket is either readable or writable
299void 337void
300client::socket_cb (iow &w, int got) 338client::socket_cb (iow &w, int got)
301{ 339{
302 //TODO remove when we have better socket cleanup logic 340 //TODO remove when we have better socket cleanup logic
303 if (status == Ns_Dead) 341 if (destroyed ())
304 { 342 {
305 socket_ev.poll (0); 343 socket_ev.poll (0);
306 return; 344 return;
307 } 345 }
308 346
… …
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
360// called whenever we have additional commands to process 395// called whenever we have additional commands to process
361void 396void
362client::cmd_cb (iw &w) 397client::cmd_cb (iw &w)
363{ 398{
364 if (handle_packet () || handle_command ()) 399 if (handle_packet ())
365 w.start (); 400 w.start ();
366 else 401 else
367 flush (); 402 flush ();
368} 403}
369 404
… …
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 (status == Ns_Dead || !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
… …
425 * shortcut function. 460 * shortcut function.
426 */ 461 */
427void 462void
428client::send_packet (packet &sl) 463client::send_packet (packet &sl)
429{ 464{
430 if (status == Ns_Dead) 465 if (destroyed ())
431 return; 466 return;
432 467
433 if (sl.length () >= MAXSOCKBUF) 468 if (sl.length () >= MAXSOCKBUF)
434 { 469 {
435 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 470 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
… …
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 **********************************************************************/
486 543
544packet::packet (const char *name)
545{
546 reset ();
547
548 int len = strlen (name);
549 memcpy (cur, name, len); cur += len;
550 *cur++ = ' ';
551}
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
487packet &packet::operator <<(const data &v) 571packet &packet::operator <<(const data &v)
488{ 572{
489 if (room () < v.len) 573 if (room () < v.len)
490 reset (); 574 reset ();
491 else 575 else
… …
528 return reset (); 612 return reset ();
529 613
530 cur += len; 614 cur += len;
531} 615}
532 616
533/******************************************************************************
534 *
535 * statistics logging functions.
536 *
537 ******************************************************************************/
538
539#ifdef CS_LOGSTATS
540
541/* cst_tot is for the life of the server, cst_last is for the last series of
542 * stats
543 */
544CS_Stats cst_tot, cst_lst;
545
546/**
547 * Writes out the gathered stats. We clear cst_lst.
548 */
549void
550write_cs_stats (void)
551{
552 time_t now = time (NULL);
553
554 /* If no connections recently, don't both to log anything */
555 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
556 return;
557
558 /* CSSTAT is put in so scripts can easily find the line */
559 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
560 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
561 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
562 cst_lst.ibytes = 0;
563 cst_lst.obytes = 0;
564 cst_lst.time_start = now;
565}
566#endif
567

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