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 1.46 by root, Sun Jun 10 04:44:21 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 if (!((pticks + fd) & 7))
53 {
58 // check time of last ack, and, if too old, kill connection 54 // check time of last ack, and, if too old, kill connection
59 struct tcp_info tcpi; 55 struct tcp_info tcpi;
60 socklen_t len = sizeof (tcpi); 56 socklen_t len = sizeof (tcpi);
61 57
62 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 58 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
63 { 59 {
64 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 60 if (tcpi.tcpi_snd_mss)
61 mss = tcpi.tcpi_snd_mss;
65 62
66 rtt = tcpi.tcpi_rtt; 63 rtt = tcpi.tcpi_rtt;
67 rttvar = tcpi.tcpi_rttvar; 64 rttvar = tcpi.tcpi_rttvar;
68 65
69 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 66 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 { 67 {
68 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
69 write_outputbuffer ();
70
72 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 71 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); 72 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
74 destroy (); 73 destroy ();
74 }
75 } 75 }
76 } 76 }
77#endif 77#endif
78 78
79 /** 79 /**
… …
81 * 81 *
82 * When the socket is clear to write, and we have backlogged data, this 82 * When the socket is clear to write, and we have backlogged data, this
83 * is called to write it out. 83 * is called to write it out.
84 */ 84 */
85 85
86 if (!outputbuffer.len || socket_ev.poll () & PE_W) 86 // write a nop to the socket at least every IDLE_NOP seconds.
87 if (!outputbuffer.len)
88 {
89 if (last_send + IDLE_PING <= NOW)
90 {
91 // this is a bit ugly, but map1/map1a seem to be the only
92 // nop'able commands and they are quite small.
93 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
94 send_packet (sl);
95 }
96 else
97 return;
98 }
99
100 if (socket_ev.poll () & PE_W)
87 return; 101 return;
88 102
103 last_send = NOW;
89 write_outputbuffer (); 104 write_outputbuffer ();
90} 105}
91 106
92void 107void
93client::write_outputbuffer () 108client::write_outputbuffer ()
… …
103 /* wrap back to start of buffer */ 118 /* wrap back to start of buffer */
104 if (outputbuffer.start == SOCKETBUFSIZE) 119 if (outputbuffer.start == SOCKETBUFSIZE)
105 outputbuffer.start = 0; 120 outputbuffer.start = 0;
106 121
107 outputbuffer.len -= res; 122 outputbuffer.len -= res;
108#ifdef CS_LOGSTATS
109 cst_tot.obytes += res;
110 cst_lst.obytes += res;
111#endif
112 } 123 }
113 else if (res == 0) 124 else if (res == 0)
114 { 125 {
115 LOG (llevError, "socket write failed, connection closed.\n"); 126 LOG (llevError, "socket write failed, connection closed.\n");
116 destroy (); 127 destroy ();
… …
183 194
184/** 195/**
185 * Dispatch table for the server. 196 * Dispatch table for the server.
186 */ 197 */
187static struct packet_type packets[] = { 198static struct packet_type packets[] = {
188 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 199 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
189 {"command", PC(PlayerCmd) PF_PLAYING }, 200 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
190 201
191 {"examine", PC(ExamineCmd) PF_PLAYING }, 202 {"examine", PC(ExamineCmd) PF_PLAYING },
203 {"ex", PC(ExCmd) PF_PLAYING },
192 {"apply", PC(ApplyCmd) PF_PLAYING }, 204 {"apply", PC(ApplyCmd) PF_PLAYING },
193 {"reply", PC(ReplyCmd) PF_IMMEDIATE },
194 {"lookat", PC(LookAt) PF_PLAYING }, 205 {"lookat", PC(LookAt) PF_PLAYING },
195 {"lock", PC(LockItem) PF_PLAYING }, 206 {"lock", PC(LockItem) PF_PLAYING },
196 {"mark", PC(MarkItem) PF_PLAYING }, 207 {"mark", PC(MarkItem) PF_PLAYING },
197 {"move", PC(MoveCmd) PF_PLAYING }, 208 {"move", PC(MoveCmd) PF_PLAYING },
198 {"exti", PC(ExtCmd) PF_IMMEDIATE }, /* CF+ */
199 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 209 {"ext", PC(ExtCmd) 0 }, // CF+
200 {"mapredraw", PC(MapRedrawCmd) PF_IMMEDIATE }, /* Added: phil */ 210 {"mapredraw", PC(MapRedrawCmd) 0 },
201 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 211 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
202 212
213 {"reply", SC(ReplyCmd) 0 },
214 {"exti", SC(ExtiCmd) 0 }, // CF+
203 {"addme", SC(AddMeCmd) PF_IMMEDIATE }, 215 {"addme", SC(AddMeCmd) 0 },
204 {"askface", SC(SendFaceCmd) PF_IMMEDIATE }, /* Added: phil */ 216 {"askface", SC(AskFaceCmd) 0 },
205 {"requestinfo", SC(RequestInfo) PF_IMMEDIATE }, 217 {"requestinfo", SC(RequestInfo) 0 },
206 {"setfacemode", SC(SetFaceMode) PF_IMMEDIATE }, 218 {"setfacemode", SC(SetFaceMode) 0 },
207 {"setsound", SC(SetSound) PF_IMMEDIATE }, 219 {"setsound", SC(SetSound) 0 },
208 {"setup", SC(SetUp) PF_IMMEDIATE }, 220 {"setup", SC(SetUp) 0 },
209 {"version", SC(VersionCmd) PF_IMMEDIATE }, 221 {"version", SC(VersionCmd) 0 },
210 {"toggleextendedinfos", SC(ToggleExtendedInfos) PF_IMMEDIATE }, /*Added: tchize */ 222 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
211 {"toggleextendedtext", SC(ToggleExtendedText) PF_IMMEDIATE }, /*Added: tchize */ 223 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
212 {"asksmooth", SC(AskSmooth) PF_IMMEDIATE }, /*Added: tchize (smoothing technologies) */ 224 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
213}; 225};
214 226
215bool 227bool
216client::may_execute (const packet_type *pkt) const 228client::may_execute (const packet_type *pkt) const
217{ 229{
218 return (!(pkt->flags & PF_PLAYER) || pl) 230 return (!(pkt->flags & PF_PLAYER) || pl)
219 && (!(pkt->flags & PF_PLAYING) || (pl && pl->state == ST_PLAYING)); 231 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
232}
233
234// HACK: some commands currently should be executed
235// even when the player is frozen. this hack detects
236// those commands. it should be folded into may_execute,
237// but kept seperate to emphasise the hack aspect, i.e.
238// do it better, then remove.
239static bool
240always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
241{
242 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
243 return false;
244
245 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
246 return false;
247
248 if (pkt->flags & PF_COMMAND6)
249 {
250 data += 6;
251 len -= 6;
252 }
253
254 if (len > 4 && !strncmp (data, "say " , 4))
255 return true;
256 if (len > 5 && !strncmp (data, "chat ", 5))
257 return true;
258
259 return false;
220} 260}
221 261
222void 262void
223client::execute (const packet_type *pkt, char *data, int datalen) 263client::execute (const packet_type *pkt, char *data, int datalen)
224{ 264{
225 if (may_execute (pkt)) 265 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
226 { 266 {
227 //TODO: only one format 267 //TODO: only one format
228 if (pkt->flags & PF_PLAYER) 268 if (pkt->flags & PF_PLAYER)
229 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 269 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
230 else 270 else
… …
271 } 311 }
272 312
273 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) 313 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
274 if (!strcmp ((char *)inbuf + 2, pkt->name)) 314 if (!strcmp ((char *)inbuf + 2, pkt->name))
275 { 315 {
276 if (pkt->flags & PF_IMMEDIATE) 316 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
317 queue_command (pkt, data, datalen);
318 else
277 execute (pkt, data, datalen); 319 execute (pkt, data, datalen);
278 else
279 queue_command (pkt, data, datalen);
280 320
281 goto next_packet; 321 goto next_packet;
282 } 322 }
283 323
284 /* If we get here, we didn't find a valid command. Logging 324 // 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); 325 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
289next_packet: 326next_packet:
290 skip_packet (pkt_len); 327 skip_packet (pkt_len);
291 328
292 // input buffer has space again 329 // input buffer has space again
… …
298// callback called when socket is either readable or writable 335// callback called when socket is either readable or writable
299void 336void
300client::socket_cb (iow &w, int got) 337client::socket_cb (iow &w, int got)
301{ 338{
302 //TODO remove when we have better socket cleanup logic 339 //TODO remove when we have better socket cleanup logic
303 if (status == Ns_Dead) 340 if (destroyed ())
304 { 341 {
305 socket_ev.poll (0); 342 socket_ev.poll (0);
306 return; 343 return;
307 } 344 }
308 345
… …
347 } 384 }
348 else 385 else
349 { 386 {
350 inbuf_len += amount; 387 inbuf_len += amount;
351 388
352 cst_tot.ibytes += amount;
353 cst_lst.ibytes += amount;
354
355 cmd_ev.start (); 389 cmd_ev.start ();
356 } 390 }
357 } 391 }
358} 392}
359 393
360// called whenever we have additional commands to process 394// called whenever we have additional commands to process
361void 395void
362client::cmd_cb (iw &w) 396client::cmd_cb (iw &w)
363{ 397{
364 if (handle_packet () || handle_command ()) 398 if (handle_packet ())
365 w.start (); 399 w.start ();
366 else 400 else
367 flush (); 401 flush ();
368} 402}
369 403
… …
381 */ 415 */
382void 416void
383client::send (void *buf_, int len) 417client::send (void *buf_, int len)
384{ 418{
385 char *buf = (char *)buf_; 419 char *buf = (char *)buf_;
386 char *pos = buf;
387 int amt = 0;
388 420
389 if (status == Ns_Dead || !buf) 421 if (destroyed () || !buf)
390 return; 422 return;
391 423
392 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 424 if (len + outputbuffer.len > SOCKETBUFSIZE)
393 { 425 {
394 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); 426 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
395 destroy (); 427 // shutdown the socket, this is safer than destroying it immediately
428 // as lots of code in the callchain might still access the map etc.
429 shutdown (fd, SHUT_RDWR);
396 return; 430 return;
397 } 431 }
398 432
399 int avail, end; 433 int avail, end;
400 434
… …
425 * shortcut function. 459 * shortcut function.
426 */ 460 */
427void 461void
428client::send_packet (packet &sl) 462client::send_packet (packet &sl)
429{ 463{
430 if (status == Ns_Dead) 464 if (destroyed ())
431 return; 465 return;
432 466
433 if (sl.length () >= MAXSOCKBUF) 467 if (sl.length () >= MAXSOCKBUF)
434 { 468 {
435 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 469 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
… …
476 va_end (ap); 510 va_end (ap);
477 511
478 send_packet (sl); 512 send_packet (sl);
479} 513}
480 514
515void
516client::send_drawinfo (const char *msg, int flags)
517{
518 send_packet_printf ("drawinfo %d %s", flags, msg);
519}
520
521void
522client::send_msg (int color, const char *type, const char *msg)
523{
524 if (can_msg)
525 send_packet_printf ("msg %d %s %s", color, type, msg);
526 else if (color < 0)
527 return; // client cannot handle this
528 else if (strchr (msg, '<') || strchr (msg, '&'))
529 {
530 //TODO: should escape/modify to old syntax
531 send_packet_printf ("drawinfo %d %s", color, msg);
532 }
533 else
534 send_packet_printf ("drawinfo %d %s", color, msg);
535}
536
481/*********************************************************************** 537/***********************************************************************
482 * 538 *
483 * packet functions/utilities 539 * packet functions/utilities
484 * 540 *
485 **********************************************************************/ 541 **********************************************************************/
486 542
543packet::packet (const char *name)
544{
545 reset ();
546
547 int len = strlen (name);
548 memcpy (cur, name, len); cur += len;
549 *cur++ = ' ';
550}
551
552packet &packet::operator <<(const ber32 v)
553{
554 enum { maxlen = 32 / 7 + 1};
555 uint8 buf[maxlen];
556 uint8 *p = buf + maxlen;
557 uint32 val = v.val;
558
559 *--p = val & 0x7F;
560
561 while (val > 0x7F)
562 {
563 val >>= 7;
564 *--p = (val & 0x7F) | 0x80;
565 }
566
567 return *this << data (p, buf + maxlen - p);
568}
569
487packet &packet::operator <<(const data &v) 570packet &packet::operator <<(const data &v)
488{ 571{
489 if (room () < v.len) 572 if (room () < v.len)
490 reset (); 573 reset ();
491 else 574 else
… …
528 return reset (); 611 return reset ();
529 612
530 cur += len; 613 cur += len;
531} 614}
532 615
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