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 1.29 by root, Thu Dec 21 23:37:06 2006 UTC vs.
Revision 1.55 by root, Sun Jul 29 13:36:40 2007 UTC

1/* 1/*
2 CrossFire, A Multiplayer game for X-windows 2 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
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
7 it under the terms of the GNU General Public License as published by 8 * it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or 9 * the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version. 10 * (at your option) 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,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details. 15 * GNU General Public License 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
17 along with this program; if not, write to the Free Software 18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, 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 * 19 *
27 * \date 2003-12-02 20 * 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 */ 21 */
34 22
35using namespace std; 23using namespace std;
36 24
37#include <global.h> 25#include <global.h>
38#include <sproto.h> 26#include <sproto.h>
39#include <cstdarg> 27#include <cstdarg>
40 28
41#ifdef __linux__ 29#if HAVE_TCP_INFO
42# include <sys/types.h> 30# include <sys/types.h>
43# include <sys/socket.h> 31# include <sys/socket.h>
44# include <netinet/in.h> 32# include <netinet/in.h>
45# include <netinet/tcp.h> 33# include <netinet/tcp.h>
46#endif 34#endif
47 35
48// use a really low timeout, as it doesn't cost any bandwidth, and you can 36// disconnect a socket after this many seconds without an ack
49// easily die in 20 seconds...
50#define SOCKET_TIMEOUT1 10 * 1000 37#define SOCKET_TIMEOUT 8.
51#define SOCKET_TIMEOUT2 20 * 1000 38
39// force a packet when idle for more than this many seconds,
40// forcing an ack regularly.
41#define IDLE_PING 2.
52 42
53void 43void
54client::flush () 44client::flush ()
55{ 45{
56 if (destroyed ()) 46 if (destroyed ())
57 return; 47 return;
58 48
59#ifdef __linux__ 49#if HAVE_TCP_INFO
60 // check time of last ack, and, if too old, kill connection 50 // check time of last ack, and, if too old, kill connection
61 struct tcp_info tcpi;
62 socklen_t len = sizeof (tcpi); 51 socklen_t len = sizeof (tcpi);
63 52
64 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 53 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
65 { 54 {
66 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 55 if (tcpi.tcpi_snd_mss)
56 mss = tcpi.tcpi_snd_mss;
67 57
68 rtt = tcpi.tcpi_rtt; 58#if 0
69 rttvar = tcpi.tcpi_rttvar; 59 fprintf (stderr, "uack %d ack %d lost %d ret %d fack %d sst %d cwnd %d mss %d pmtu %d advmss %d EXC %d\n",
60 tcpi.tcpi_unacked,
61 tcpi.tcpi_sacked,
62 tcpi.tcpi_lost,
63 tcpi.tcpi_retrans,
64 tcpi.tcpi_fackets,
65 tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu, tcpi.tcpi_advmss,
66
67 tcpi.tcpi_snd_cwnd - (tcpi.tcpi_unacked - tcpi.tcpi_sacked));
68#endif
70 69
71 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s 70 // do this only when player is active
72 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s 71 if (pl && pl->active
72 && tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
73 { 73 {
74 send_msg (NDI_RED | NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
75 write_outputbuffer ();
76
74 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 77 LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
75 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); 78 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
76 destroy (); 79 destroy ();
77 } 80 }
78 } 81 }
79#endif 82#endif
80 83
… …
83 * 86 *
84 * When the socket is clear to write, and we have backlogged data, this 87 * When the socket is clear to write, and we have backlogged data, this
85 * is called to write it out. 88 * is called to write it out.
86 */ 89 */
87 90
88 if (!outputbuffer.len || socket_ev.poll () & PE_W) 91 // write a nop to the socket at least every IDLE_NOP seconds.
92 if (!outputbuffer.len)
93 {
94 if (last_send + IDLE_PING <= NOW && pl && pl->active)
95 {
96 // this is a bit ugly, but map1/map1a seem to be the only
97 // nop'able commands and they are quite small.
98 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
99 send_packet (sl);
100 }
101 else
102 return;
103 }
104
105 if (socket_ev.poll () & PE_W)
89 return; 106 return;
90 107
108 last_send = NOW;
91 write_outputbuffer (); 109 write_outputbuffer ();
92} 110}
93 111
94void 112void
95client::write_outputbuffer () 113client::write_outputbuffer ()
… …
105 /* wrap back to start of buffer */ 123 /* wrap back to start of buffer */
106 if (outputbuffer.start == SOCKETBUFSIZE) 124 if (outputbuffer.start == SOCKETBUFSIZE)
107 outputbuffer.start = 0; 125 outputbuffer.start = 0;
108 126
109 outputbuffer.len -= res; 127 outputbuffer.len -= res;
110#ifdef CS_LOGSTATS
111 cst_tot.obytes += res;
112 cst_lst.obytes += res;
113#endif
114 } 128 }
115 else if (res == 0) 129 else if (res == 0)
116 { 130 {
117 LOG (llevError, "socket write failed, connection closed.\n"); 131 LOG (llevError, "socket write failed, connection closed.\n");
118 destroy (); 132 destroy ();
… …
156 if (inbuf_len >= 2 + pkt_len) 170 if (inbuf_len >= 2 + pkt_len)
157 return 2 + pkt_len; 171 return 2 + pkt_len;
158 172
159 if (inbuf_len == sizeof (inbuf)) 173 if (inbuf_len == sizeof (inbuf))
160 { 174 {
161 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED); 175 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY);
162 destroy (); 176 destroy ();
163 return -1; 177 return -1;
164 } 178 }
165 } 179 }
166 180
… …
185 199
186/** 200/**
187 * Dispatch table for the server. 201 * Dispatch table for the server.
188 */ 202 */
189static struct packet_type packets[] = { 203static struct packet_type packets[] = {
190 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 204 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
191 {"command", PC(PlayerCmd) PF_PLAYING }, 205 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
192 206
193 {"examine", PC(ExamineCmd) PF_PLAYING }, 207 {"examine", PC(ExamineCmd) PF_PLAYING },
208 {"ex", PC(ExCmd) PF_PLAYING },
194 {"apply", PC(ApplyCmd) PF_PLAYING }, 209 {"apply", PC(ApplyCmd) PF_PLAYING },
195 {"lookat", PC(LookAt) PF_PLAYING }, 210 {"lookat", PC(LookAt) PF_PLAYING },
196 {"lock", PC(LockItem) PF_PLAYING }, 211 {"lock", PC(LockItem) PF_PLAYING },
197 {"mark", PC(MarkItem) PF_PLAYING }, 212 {"mark", PC(MarkItem) PF_PLAYING },
198 {"move", PC(MoveCmd) PF_PLAYING }, 213 {"move", PC(MoveCmd) PF_PLAYING },
199 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 214 {"ext", PC(ExtCmd) 0 }, // CF+
200 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 215 {"mapredraw", PC(MapRedrawCmd) 0 },
201 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 216 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
202 217
203 {"reply", SC(ReplyCmd) 0 }, 218 {"reply", SC(ReplyCmd) 0 },
204 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 219 {"exti", SC(ExtiCmd) 0 }, // CF+
205 {"addme", SC(AddMeCmd) 0 }, 220 {"addme", SC(AddMeCmd) 0 },
206 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ 221 {"askface", SC(AskFaceCmd) 0 },
207 {"requestinfo", SC(RequestInfo) 0 }, 222 {"requestinfo", SC(RequestInfo) 0 },
208 {"setfacemode", SC(SetFaceMode) 0 }, 223 {"setfacemode", SC(SetFaceMode) 0 },
209 {"setsound", SC(SetSound) 0 }, 224 {"setsound", SC(SetSound) 0 },
210 {"setup", SC(SetUp) 0 }, 225 {"setup", SC(SetUp) 0 },
211 {"version", SC(VersionCmd) 0 }, 226 {"version", SC(VersionCmd) 0 },
… …
219{ 234{
220 return (!(pkt->flags & PF_PLAYER) || pl) 235 return (!(pkt->flags & PF_PLAYER) || pl)
221 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); 236 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
222} 237}
223 238
239// HACK: some commands currently should be executed
240// even when the player is frozen. this hack detects
241// those commands. it should be folded into may_execute,
242// but kept seperate to emphasise the hack aspect, i.e.
243// do it better, then remove.
244static bool
245always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
246{
247 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
248 return false;
249
250 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
251 return false;
252
253 if (pkt->flags & PF_COMMAND6)
254 {
255 data += 6;
256 len -= 6;
257 }
258
259 if (len > 4 && !strncmp (data, "say " , 4))
260 return true;
261 if (len > 5 && !strncmp (data, "chat ", 5))
262 return true;
263
264 return false;
265}
266
224void 267void
225client::execute (const packet_type *pkt, char *data, int datalen) 268client::execute (const packet_type *pkt, char *data, int datalen)
226{ 269{
227 if (may_execute (pkt)) 270 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
228 { 271 {
229 //TODO: only one format 272 //TODO: only one format
230 if (pkt->flags & PF_PLAYER) 273 if (pkt->flags & PF_PLAYER)
231 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 274 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
232 else 275 else
233 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 276 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
234 } 277 }
235 else 278 else
236 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); 279 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
237} 280}
238 281
239bool 282bool
240client::handle_packet () 283client::handle_packet ()
241{ 284{
… …
273 } 316 }
274 317
275 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) 318 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
276 if (!strcmp ((char *)inbuf + 2, pkt->name)) 319 if (!strcmp ((char *)inbuf + 2, pkt->name))
277 { 320 {
278 if (pkt->flags & PF_PLAYER) 321 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
279 queue_command (pkt, data, datalen); 322 queue_command (pkt, data, datalen);
280 else 323 else
281 execute (pkt, data, datalen); 324 execute (pkt, data, datalen);
282 325
283 goto next_packet; 326 goto next_packet;
284 } 327 }
285 328
286 // If we get here, we didn't find a valid command. 329 // If we get here, we didn't find a valid command.
287 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); 330 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
288next_packet: 331next_packet:
289 skip_packet (pkt_len); 332 skip_packet (pkt_len);
290 333
291 // input buffer has space again 334 // input buffer has space again
292 socket_ev.poll (socket_ev.poll () | PE_R); 335 socket_ev.poll (socket_ev.poll () | PE_R);
… …
346 } 389 }
347 else 390 else
348 { 391 {
349 inbuf_len += amount; 392 inbuf_len += amount;
350 393
351 cst_tot.ibytes += amount;
352 cst_lst.ibytes += amount;
353
354 cmd_ev.start (); 394 cmd_ev.start ();
355 } 395 }
356 } 396 }
357} 397}
358 398
… …
380 */ 420 */
381void 421void
382client::send (void *buf_, int len) 422client::send (void *buf_, int len)
383{ 423{
384 char *buf = (char *)buf_; 424 char *buf = (char *)buf_;
385 char *pos = buf;
386 int amt = 0;
387 425
388 if (destroyed () || !buf) 426 if (destroyed () || !buf)
389 return; 427 return;
390 428
391 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 429 if (len + outputbuffer.len > SOCKETBUFSIZE)
392 { 430 {
393 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); 431 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
394 destroy (); 432 // shutdown the socket, this is safer than destroying it immediately
433 // as lots of code in the callchain might still access the map etc.
434 shutdown (fd, SHUT_RDWR);
395 return; 435 return;
396 } 436 }
397 437
398 int avail, end; 438 int avail, end;
399 439
… …
427client::send_packet (packet &sl) 467client::send_packet (packet &sl)
428{ 468{
429 if (destroyed ()) 469 if (destroyed ())
430 return; 470 return;
431 471
432 if (sl.length () >= MAXSOCKBUF) 472 if (sl.length () > MAXSOCKBUF)
433 { 473 {
434 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 474 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
435 /* Almost certainly we've overflowed a buffer, so quit now to make 475 /* Almost certainly we've overflowed a buffer, so quit now to make
436 * it easier to debug. 476 * it easier to debug.
437 */ 477 */
… …
475 va_end (ap); 515 va_end (ap);
476 516
477 send_packet (sl); 517 send_packet (sl);
478} 518}
479 519
520// returns true when the message needs special (read: perl) treatment
521static bool
522msg_is_special (const char *msg)
523{
524 return msg [strcspn (msg, "<[&\n")];
525}
526
527void
528client::send_msg (int color, const char *type, const char *msg)
529{
530 if (msg_is_special (msg))
531 cfperl_send_msg (this, color, type, msg);
532 else if (can_msg)
533 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
534 else if (color < 0)
535 return; // client cannot handle this
536 else
537 send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
538}
539
540void
541client::send_drawinfo (const char *msg, int flags)
542{
543 send_msg (flags, "log", msg);
544}
545
480/*********************************************************************** 546/***********************************************************************
481 * 547 *
482 * packet functions/utilities 548 * packet functions/utilities
483 * 549 *
484 **********************************************************************/ 550 **********************************************************************/
… …
490 int len = strlen (name); 556 int len = strlen (name);
491 memcpy (cur, name, len); cur += len; 557 memcpy (cur, name, len); cur += len;
492 *cur++ = ' '; 558 *cur++ = ' ';
493} 559}
494 560
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
495packet &packet::operator <<(const data &v) 579packet &packet::operator <<(const data &v)
496{ 580{
497 if (room () < v.len) 581 if (room () < v.len)
498 reset (); 582 reset ();
499 else 583 else
… …
536 return reset (); 620 return reset ();
537 621
538 cur += len; 622 cur += len;
539} 623}
540 624
541/******************************************************************************
542 *
543 * statistics logging functions.
544 *
545 ******************************************************************************/
546
547#ifdef CS_LOGSTATS
548
549/* cst_tot is for the life of the server, cst_last is for the last series of
550 * stats
551 */
552CS_Stats cst_tot, cst_lst;
553
554/**
555 * Writes out the gathered stats. We clear cst_lst.
556 */
557void
558write_cs_stats (void)
559{
560 time_t now = time (NULL);
561
562 /* If no connections recently, don't both to log anything */
563 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
564 return;
565
566 /* CSSTAT is put in so scripts can easily find the line */
567 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
568 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
569 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
570 cst_lst.ibytes = 0;
571 cst_lst.obytes = 0;
572 cst_lst.time_start = now;
573}
574#endif
575

Diff Legend

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