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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.27 by root, Wed Dec 20 01:19:11 2006 UTC vs.
Revision 1.50 by root, Thu Jul 12 19:36:58 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#define HAVE_SIOCOUTQ 1 //TODO configure.ac support
49// easily die in 20 seconds... 37#if HAVE_SIOCOUTQ
38# include <linux/sockios.h>
39#endif
40
41// disconnect a socket after this many seconds without an ack
50#define SOCKET_TIMEOUT1 10 * 1000 42#define SOCKET_TIMEOUT 8.
51#define SOCKET_TIMEOUT2 20 * 1000 43
44// force a packet when idle for more than this many seconds,
45// forcing an ack regularly.
46#define IDLE_PING 2.
52 47
53void 48void
54client::flush () 49client::flush ()
55{ 50{
56#ifdef __linux__ 51 if (destroyed ())
52 return;
53
54# if HAVE_SIOCOUTQ
55 {
56 int value;
57
58 if (!ioctl (fd, SIOCOUTQ, &value))
59 outq = value;
60 }
61# endif
62
63#if HAVE_TCP_INFO
64 // check about once per second, spread evenly over all clients
65 // do this only when player is active
66 if (!((pticks + fd) & 7) && pl && pl->active)
67 {
57 // check time of last ack, and, if too old, kill connection 68 // check time of last ack, and, if too old, kill connection
58 struct tcp_info tcpi; 69 struct tcp_info tcpi;
59 socklen_t len = sizeof (tcpi); 70 socklen_t len = sizeof (tcpi);
60 71
61 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 72 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
62 { 73 {
63 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 74 if (tcpi.tcpi_snd_mss)
75 mss = tcpi.tcpi_snd_mss;
64 76
65 rtt = tcpi.tcpi_rtt; 77 rtt = tcpi.tcpi_rtt;
66 rttvar = tcpi.tcpi_rttvar; 78 rttvar = tcpi.tcpi_rttvar;
67 79
68 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s 80 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
69 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
70 { 81 {
82 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
83 write_outputbuffer ();
84
71 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 85 LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
72 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); 86 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
73 destroy (); 87 destroy ();
88 }
74 } 89 }
75 } 90 }
76#endif 91#endif
77 92
78 /** 93 /**
… …
80 * 95 *
81 * When the socket is clear to write, and we have backlogged data, this 96 * When the socket is clear to write, and we have backlogged data, this
82 * is called to write it out. 97 * is called to write it out.
83 */ 98 */
84 99
85 if (!outputbuffer.len || socket_ev.poll () & PE_W) 100 // write a nop to the socket at least every IDLE_NOP seconds.
101 if (!outputbuffer.len)
102 {
103 if (last_send + IDLE_PING <= NOW && pl && pl->active)
104 {
105 // this is a bit ugly, but map1/map1a seem to be the only
106 // nop'able commands and they are quite small.
107 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
108 send_packet (sl);
109 }
110 else
111 return;
112 }
113
114 if (socket_ev.poll () & PE_W)
86 return; 115 return;
87 116
117 last_send = NOW;
88 write_outputbuffer (); 118 write_outputbuffer ();
89} 119}
90 120
91void 121void
92client::write_outputbuffer () 122client::write_outputbuffer ()
… …
102 /* wrap back to start of buffer */ 132 /* wrap back to start of buffer */
103 if (outputbuffer.start == SOCKETBUFSIZE) 133 if (outputbuffer.start == SOCKETBUFSIZE)
104 outputbuffer.start = 0; 134 outputbuffer.start = 0;
105 135
106 outputbuffer.len -= res; 136 outputbuffer.len -= res;
107#ifdef CS_LOGSTATS
108 cst_tot.obytes += res;
109 cst_lst.obytes += res;
110#endif
111 } 137 }
112 else if (res == 0) 138 else if (res == 0)
113 { 139 {
114 LOG (llevError, "socket write failed, connection closed.\n"); 140 LOG (llevError, "socket write failed, connection closed.\n");
115 destroy (); 141 destroy ();
… …
182 208
183/** 209/**
184 * Dispatch table for the server. 210 * Dispatch table for the server.
185 */ 211 */
186static struct packet_type packets[] = { 212static struct packet_type packets[] = {
187 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 213 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
188 {"command", PC(PlayerCmd) PF_PLAYING }, 214 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
189 215
190 {"examine", PC(ExamineCmd) PF_PLAYING }, 216 {"examine", PC(ExamineCmd) PF_PLAYING },
217 {"ex", PC(ExCmd) PF_PLAYING },
191 {"apply", PC(ApplyCmd) PF_PLAYING }, 218 {"apply", PC(ApplyCmd) PF_PLAYING },
192 {"reply", PC(ReplyCmd) 0 },
193 {"lookat", PC(LookAt) PF_PLAYING }, 219 {"lookat", PC(LookAt) PF_PLAYING },
194 {"lock", PC(LockItem) PF_PLAYING }, 220 {"lock", PC(LockItem) PF_PLAYING },
195 {"mark", PC(MarkItem) PF_PLAYING }, 221 {"mark", PC(MarkItem) PF_PLAYING },
196 {"move", PC(MoveCmd) PF_PLAYING }, 222 {"move", PC(MoveCmd) PF_PLAYING },
197 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 223 {"ext", PC(ExtCmd) 0 }, // CF+
198 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 224 {"mapredraw", PC(MapRedrawCmd) 0 },
199 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 225 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
200 226
227 {"reply", SC(ReplyCmd) 0 },
201 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 228 {"exti", SC(ExtiCmd) 0 }, // CF+
202 {"addme", SC(AddMeCmd) 0 }, 229 {"addme", SC(AddMeCmd) 0 },
203 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ 230 {"askface", SC(AskFaceCmd) 0 },
204 {"requestinfo", SC(RequestInfo) 0 }, 231 {"requestinfo", SC(RequestInfo) 0 },
205 {"setfacemode", SC(SetFaceMode) 0 }, 232 {"setfacemode", SC(SetFaceMode) 0 },
206 {"setsound", SC(SetSound) 0 }, 233 {"setsound", SC(SetSound) 0 },
207 {"setup", SC(SetUp) 0 }, 234 {"setup", SC(SetUp) 0 },
208 {"version", SC(VersionCmd) 0 }, 235 {"version", SC(VersionCmd) 0 },
… …
213 240
214bool 241bool
215client::may_execute (const packet_type *pkt) const 242client::may_execute (const packet_type *pkt) const
216{ 243{
217 return (!(pkt->flags & PF_PLAYER) || pl) 244 return (!(pkt->flags & PF_PLAYER) || pl)
218 && (!(pkt->flags & PF_PLAYING) || (pl && pl->state == ST_PLAYING)); 245 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
246}
247
248// HACK: some commands currently should be executed
249// even when the player is frozen. this hack detects
250// those commands. it should be folded into may_execute,
251// but kept seperate to emphasise the hack aspect, i.e.
252// do it better, then remove.
253static bool
254always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
255{
256 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
257 return false;
258
259 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
260 return false;
261
262 if (pkt->flags & PF_COMMAND6)
263 {
264 data += 6;
265 len -= 6;
266 }
267
268 if (len > 4 && !strncmp (data, "say " , 4))
269 return true;
270 if (len > 5 && !strncmp (data, "chat ", 5))
271 return true;
272
273 return false;
219} 274}
220 275
221void 276void
222client::execute (const packet_type *pkt, char *data, int datalen) 277client::execute (const packet_type *pkt, char *data, int datalen)
223{ 278{
224 if (may_execute (pkt)) 279 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
225 { 280 {
226 //TODO: only one format 281 //TODO: only one format
227 if (pkt->flags & PF_PLAYER) 282 if (pkt->flags & PF_PLAYER)
228 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 283 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
229 else 284 else
… …
270 } 325 }
271 326
272 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) 327 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
273 if (!strcmp ((char *)inbuf + 2, pkt->name)) 328 if (!strcmp ((char *)inbuf + 2, pkt->name))
274 { 329 {
275 if (pkt->flags & PF_PLAYER) 330 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
276 queue_command (pkt, data, datalen); 331 queue_command (pkt, data, datalen);
277 else 332 else
278 execute (pkt, data, datalen); 333 execute (pkt, data, datalen);
279 334
280 goto next_packet; 335 goto next_packet;
… …
294// callback called when socket is either readable or writable 349// callback called when socket is either readable or writable
295void 350void
296client::socket_cb (iow &w, int got) 351client::socket_cb (iow &w, int got)
297{ 352{
298 //TODO remove when we have better socket cleanup logic 353 //TODO remove when we have better socket cleanup logic
299 if (status == Ns_Dead) 354 if (destroyed ())
300 { 355 {
301 socket_ev.poll (0); 356 socket_ev.poll (0);
302 return; 357 return;
303 } 358 }
304 359
… …
343 } 398 }
344 else 399 else
345 { 400 {
346 inbuf_len += amount; 401 inbuf_len += amount;
347 402
348 cst_tot.ibytes += amount;
349 cst_lst.ibytes += amount;
350
351 cmd_ev.start (); 403 cmd_ev.start ();
352 } 404 }
353 } 405 }
354} 406}
355 407
… …
377 */ 429 */
378void 430void
379client::send (void *buf_, int len) 431client::send (void *buf_, int len)
380{ 432{
381 char *buf = (char *)buf_; 433 char *buf = (char *)buf_;
382 char *pos = buf;
383 int amt = 0;
384 434
385 if (status == Ns_Dead || !buf) 435 if (destroyed () || !buf)
386 return; 436 return;
387 437
388 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 438 if (len + outputbuffer.len > SOCKETBUFSIZE)
389 { 439 {
390 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); 440 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
391 destroy (); 441 // shutdown the socket, this is safer than destroying it immediately
442 // as lots of code in the callchain might still access the map etc.
443 shutdown (fd, SHUT_RDWR);
392 return; 444 return;
393 } 445 }
394 446
395 int avail, end; 447 int avail, end;
396 448
… …
421 * shortcut function. 473 * shortcut function.
422 */ 474 */
423void 475void
424client::send_packet (packet &sl) 476client::send_packet (packet &sl)
425{ 477{
426 if (status == Ns_Dead) 478 if (destroyed ())
427 return; 479 return;
428 480
429 if (sl.length () >= MAXSOCKBUF) 481 if (sl.length () >= MAXSOCKBUF)
430 { 482 {
431 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 483 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
… …
472 va_end (ap); 524 va_end (ap);
473 525
474 send_packet (sl); 526 send_packet (sl);
475} 527}
476 528
529// returns true when the message needs special (read: perl) treatment
530static bool
531msg_is_special (const char *msg)
532{
533 return msg [strcspn (msg, "<[&\n")];
534}
535
536void
537client::send_msg (int color, const char *type, const char *msg)
538{
539 if (msg_is_special (msg))
540 cfperl_send_msg (this, color, type, msg);
541 else if (can_msg)
542 send_packet_printf ("msg %d %s %s", color, type, msg);
543 else if (color < 0)
544 return; // client cannot handle this
545 else
546 send_packet_printf ("drawinfo %d %s", color, msg);
547}
548
549void
550client::send_drawinfo (const char *msg, int flags)
551{
552 send_msg (flags, "log", msg);
553}
554
477/*********************************************************************** 555/***********************************************************************
478 * 556 *
479 * packet functions/utilities 557 * packet functions/utilities
480 * 558 *
481 **********************************************************************/ 559 **********************************************************************/
… …
487 int len = strlen (name); 565 int len = strlen (name);
488 memcpy (cur, name, len); cur += len; 566 memcpy (cur, name, len); cur += len;
489 *cur++ = ' '; 567 *cur++ = ' ';
490} 568}
491 569
570packet &packet::operator <<(const ber32 v)
571{
572 enum { maxlen = 32 / 7 + 1};
573 uint8 buf[maxlen];
574 uint8 *p = buf + maxlen;
575 uint32 val = v.val;
576
577 *--p = val & 0x7F;
578
579 while (val > 0x7F)
580 {
581 val >>= 7;
582 *--p = (val & 0x7F) | 0x80;
583 }
584
585 return *this << data (p, buf + maxlen - p);
586}
587
492packet &packet::operator <<(const data &v) 588packet &packet::operator <<(const data &v)
493{ 589{
494 if (room () < v.len) 590 if (room () < v.len)
495 reset (); 591 reset ();
496 else 592 else
… …
533 return reset (); 629 return reset ();
534 630
535 cur += len; 631 cur += len;
536} 632}
537 633
538/******************************************************************************
539 *
540 * statistics logging functions.
541 *
542 ******************************************************************************/
543
544#ifdef CS_LOGSTATS
545
546/* cst_tot is for the life of the server, cst_last is for the last series of
547 * stats
548 */
549CS_Stats cst_tot, cst_lst;
550
551/**
552 * Writes out the gathered stats. We clear cst_lst.
553 */
554void
555write_cs_stats (void)
556{
557 time_t now = time (NULL);
558
559 /* If no connections recently, don't both to log anything */
560 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
561 return;
562
563 /* CSSTAT is put in so scripts can easily find the line */
564 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
565 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
566 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
567 cst_lst.ibytes = 0;
568 cst_lst.obytes = 0;
569 cst_lst.time_start = now;
570}
571#endif
572

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