ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/deliantra/server/socket/lowlevel.C
(Generate patch)

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.25 by root, Sun Dec 17 19:14:00 2006 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 (©) 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 *
20 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>
21*/ 22 */
22 23
23/** 24/**
24 * \file 25 * \file
25 * Low-level socket-related functions. 26 * Low-level socket-related functions.
26 * 27 *
… …
40 41
41#ifdef __linux__ 42#ifdef __linux__
42# include <sys/types.h> 43# include <sys/types.h>
43# include <sys/socket.h> 44# include <sys/socket.h>
44# include <netinet/in.h> 45# include <netinet/in.h>
45# define TCP_HZ 1000 // sorry...
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 50#define SOCKET_TIMEOUT 8.
52#define SOCKET_TIMEOUT2 20 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{
59 if (destroyed ())
60 return;
61
57#ifdef __linux__ 62#ifdef __linux__
63 // check about once per second, spread evenly over all clients
64 if (!((pticks + fd) & 7))
65 {
58 // check time of last ack, and, if too old, kill connection 66 // check time of last ack, and, if too old, kill connection
59 struct tcp_info tcpi; 67 struct tcp_info tcpi;
60 socklen_t len = sizeof (tcpi); 68 socklen_t len = sizeof (tcpi);
61 69
62 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))
63 { 71 {
64 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
65
66 rtt = tcpi.tcpi_rtt; 72 rtt = tcpi.tcpi_rtt;
67 rttvar = tcpi.tcpi_rttvar; 73 rttvar = tcpi.tcpi_rttvar;
68 74
69 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 75 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 { 76 {
77 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
78 write_outputbuffer ();
79
72 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,
73 (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);
74 destroy (); 82 destroy ();
83 }
75 } 84 }
76 } 85 }
77#endif 86#endif
78 87
79 /** 88 /**
… …
81 * 90 *
82 * 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
83 * is called to write it out. 92 * is called to write it out.
84 */ 93 */
85 94
86 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)
87 return; 110 return;
88 111
112 last_send = NOW;
89 write_outputbuffer (); 113 write_outputbuffer ();
90} 114}
91 115
92void 116void
93client::write_outputbuffer () 117client::write_outputbuffer ()
… …
103 /* wrap back to start of buffer */ 127 /* wrap back to start of buffer */
104 if (outputbuffer.start == SOCKETBUFSIZE) 128 if (outputbuffer.start == SOCKETBUFSIZE)
105 outputbuffer.start = 0; 129 outputbuffer.start = 0;
106 130
107 outputbuffer.len -= res; 131 outputbuffer.len -= res;
108#ifdef CS_LOGSTATS
109 cst_tot.obytes += res;
110 cst_lst.obytes += res;
111#endif
112 } 132 }
113 else if (res == 0) 133 else if (res == 0)
114 { 134 {
115 LOG (llevError, "socket write failed, connection closed.\n"); 135 LOG (llevError, "socket write failed, connection closed.\n");
116 destroy (); 136 destroy ();
… …
183 203
184/** 204/**
185 * Dispatch table for the server. 205 * Dispatch table for the server.
186 */ 206 */
187static struct packet_type packets[] = { 207static struct packet_type packets[] = {
188 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 208 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
189 {"command", PC(PlayerCmd) PF_PLAYING }, 209 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
190 210
191 {"examine", PC(ExamineCmd) PF_PLAYING }, 211 {"examine", PC(ExamineCmd) PF_PLAYING },
212 {"ex", PC(ExCmd) PF_PLAYING },
192 {"apply", PC(ApplyCmd) PF_PLAYING }, 213 {"apply", PC(ApplyCmd) PF_PLAYING },
193 {"reply", PC(ReplyCmd) PF_IMMEDIATE },
194 {"lookat", PC(LookAt) PF_PLAYING }, 214 {"lookat", PC(LookAt) PF_PLAYING },
195 {"lock", PC(LockItem) PF_PLAYING }, 215 {"lock", PC(LockItem) PF_PLAYING },
196 {"mark", PC(MarkItem) PF_PLAYING }, 216 {"mark", PC(MarkItem) PF_PLAYING },
197 {"move", PC(MoveCmd) PF_PLAYING }, 217 {"move", PC(MoveCmd) PF_PLAYING },
198 {"exti", PC(ExtCmd) PF_IMMEDIATE }, /* CF+ */
199 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 218 {"ext", PC(ExtCmd) 0 }, // CF+
200 {"mapredraw", PC(MapRedrawCmd) PF_IMMEDIATE }, /* Added: phil */ 219 {"mapredraw", PC(MapRedrawCmd) 0 },
201 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 220 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
202 221
222 {"reply", SC(ReplyCmd) 0 },
223 {"exti", SC(ExtiCmd) 0 }, // CF+
203 {"addme", SC(AddMeCmd) PF_IMMEDIATE }, 224 {"addme", SC(AddMeCmd) 0 },
204 {"askface", SC(SendFaceCmd) PF_IMMEDIATE }, /* Added: phil */ 225 {"askface", SC(AskFaceCmd) 0 },
205 {"requestinfo", SC(RequestInfo) PF_IMMEDIATE }, 226 {"requestinfo", SC(RequestInfo) 0 },
206 {"setfacemode", SC(SetFaceMode) PF_IMMEDIATE }, 227 {"setfacemode", SC(SetFaceMode) 0 },
207 {"setsound", SC(SetSound) PF_IMMEDIATE }, 228 {"setsound", SC(SetSound) 0 },
208 {"setup", SC(SetUp) PF_IMMEDIATE }, 229 {"setup", SC(SetUp) 0 },
209 {"version", SC(VersionCmd) PF_IMMEDIATE }, 230 {"version", SC(VersionCmd) 0 },
210 {"toggleextendedinfos", SC(ToggleExtendedInfos) PF_IMMEDIATE }, /*Added: tchize */ 231 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
211 {"toggleextendedtext", SC(ToggleExtendedText) PF_IMMEDIATE }, /*Added: tchize */ 232 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
212 {"asksmooth", SC(AskSmooth) PF_IMMEDIATE }, /*Added: tchize (smoothing technologies) */ 233 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
213}; 234};
214 235
215bool 236bool
216client::may_execute (const packet_type *pkt) const 237client::may_execute (const packet_type *pkt) const
217{ 238{
218 return (!(pkt->flags & PF_PLAYER) || pl) 239 return (!(pkt->flags & PF_PLAYER) || pl)
219 && (!(pkt->flags & PF_PLAYING) || (pl && pl->state == ST_PLAYING)); 240 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
241}
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;
220} 269}
221 270
222void 271void
223client::execute (const packet_type *pkt, char *data, int datalen) 272client::execute (const packet_type *pkt, char *data, int datalen)
224{ 273{
225 if (may_execute (pkt)) 274 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
226 { 275 {
227 //TODO: only one format 276 //TODO: only one format
228 if (pkt->flags & PF_PLAYER) 277 if (pkt->flags & PF_PLAYER)
229 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 278 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
230 else 279 else
… …
271 } 320 }
272 321
273 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)
274 if (!strcmp ((char *)inbuf + 2, pkt->name)) 323 if (!strcmp ((char *)inbuf + 2, pkt->name))
275 { 324 {
276 if (pkt->flags & PF_IMMEDIATE) 325 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
326 queue_command (pkt, data, datalen);
327 else
277 execute (pkt, data, datalen); 328 execute (pkt, data, datalen);
278 else
279 queue_command (pkt, data, datalen);
280 329
281 goto next_packet; 330 goto next_packet;
282 } 331 }
283 332
284 /* If we get here, we didn't find a valid command. Logging 333 // 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); 334 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
289next_packet: 335next_packet:
290 skip_packet (pkt_len); 336 skip_packet (pkt_len);
291 337
292 // input buffer has space again 338 // input buffer has space again
… …
298// callback called when socket is either readable or writable 344// callback called when socket is either readable or writable
299void 345void
300client::socket_cb (iow &w, int got) 346client::socket_cb (iow &w, int got)
301{ 347{
302 //TODO remove when we have better socket cleanup logic 348 //TODO remove when we have better socket cleanup logic
303 if (status == Ns_Dead) 349 if (destroyed ())
304 { 350 {
305 socket_ev.poll (0); 351 socket_ev.poll (0);
306 return; 352 return;
307 } 353 }
308 354
… …
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
360// called whenever we have additional commands to process 403// called whenever we have additional commands to process
361void 404void
362client::cmd_cb (iw &w) 405client::cmd_cb (iw &w)
363{ 406{
364 if (handle_packet () || handle_command ()) 407 if (handle_packet ())
365 w.start (); 408 w.start ();
366 else 409 else
367 flush (); 410 flush ();
368} 411}
369 412
… …
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 (status == Ns_Dead || !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
… …
425 * shortcut function. 468 * shortcut function.
426 */ 469 */
427void 470void
428client::send_packet (packet &sl) 471client::send_packet (packet &sl)
429{ 472{
430 if (status == Ns_Dead) 473 if (destroyed ())
431 return; 474 return;
432 475
433 if (sl.length () >= MAXSOCKBUF) 476 if (sl.length () >= MAXSOCKBUF)
434 { 477 {
435 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 478 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
… …
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 **********************************************************************/
551
552packet::packet (const char *name)
553{
554 reset ();
555
556 int len = strlen (name);
557 memcpy (cur, name, len); cur += len;
558 *cur++ = ' ';
559}
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}
486 578
487packet &packet::operator <<(const data &v) 579packet &packet::operator <<(const data &v)
488{ 580{
489 if (room () < v.len) 581 if (room () < v.len)
490 reset (); 582 reset ();
… …
528 return reset (); 620 return reset ();
529 621
530 cur += len; 622 cur += len;
531} 623}
532 624
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

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines