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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.26 by root, Tue Dec 19 04:58:05 2006 UTC vs.
Revision 1.45 by root, Sun Jun 10 02:51:46 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# include <netinet/tcp.h> 34# include <netinet/tcp.h>
46#endif 35#endif
47 36
48// 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
49// easily die in 20 seconds...
50#define SOCKET_TIMEOUT1 10 * 1000 38#define SOCKET_TIMEOUT 8.
51#define SOCKET_TIMEOUT2 20 * 1000 39
40// force a packet when idle for more than this many seconds,
41// forcing an ack regularly.
42#define IDLE_PING 2.
52 43
53void 44void
54client::flush () 45client::flush ()
55{ 46{
56#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 {
57 // check time of last ack, and, if too old, kill connection 54 // check time of last ack, and, if too old, kill connection
58 struct tcp_info tcpi; 55 struct tcp_info tcpi;
59 socklen_t len = sizeof (tcpi); 56 socklen_t len = sizeof (tcpi);
60 57
61 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))
62 { 59 {
63 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
64
65 rtt = tcpi.tcpi_rtt; 60 rtt = tcpi.tcpi_rtt;
66 rttvar = tcpi.tcpi_rttvar; 61 rttvar = tcpi.tcpi_rttvar;
67 62
68 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s 63 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
69 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
70 { 64 {
65 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
66 write_outputbuffer ();
67
71 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 68 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); 69 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
73 destroy (); 70 destroy ();
71 }
74 } 72 }
75 } 73 }
76#endif 74#endif
77 75
78 /** 76 /**
… …
80 * 78 *
81 * When the socket is clear to write, and we have backlogged data, this 79 * When the socket is clear to write, and we have backlogged data, this
82 * is called to write it out. 80 * is called to write it out.
83 */ 81 */
84 82
85 if (!outputbuffer.len || socket_ev.poll () & PE_W) 83 // write a nop to the socket at least every IDLE_NOP seconds.
84 if (!outputbuffer.len)
85 {
86 if (last_send + IDLE_PING <= NOW)
87 {
88 // this is a bit ugly, but map1/map1a seem to be the only
89 // nop'able commands and they are quite small.
90 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
91 send_packet (sl);
92 }
93 else
94 return;
95 }
96
97 if (socket_ev.poll () & PE_W)
86 return; 98 return;
87 99
100 last_send = NOW;
88 write_outputbuffer (); 101 write_outputbuffer ();
89} 102}
90 103
91void 104void
92client::write_outputbuffer () 105client::write_outputbuffer ()
… …
102 /* wrap back to start of buffer */ 115 /* wrap back to start of buffer */
103 if (outputbuffer.start == SOCKETBUFSIZE) 116 if (outputbuffer.start == SOCKETBUFSIZE)
104 outputbuffer.start = 0; 117 outputbuffer.start = 0;
105 118
106 outputbuffer.len -= res; 119 outputbuffer.len -= res;
107#ifdef CS_LOGSTATS
108 cst_tot.obytes += res;
109 cst_lst.obytes += res;
110#endif
111 } 120 }
112 else if (res == 0) 121 else if (res == 0)
113 { 122 {
114 LOG (llevError, "socket write failed, connection closed.\n"); 123 LOG (llevError, "socket write failed, connection closed.\n");
115 destroy (); 124 destroy ();
… …
182 191
183/** 192/**
184 * Dispatch table for the server. 193 * Dispatch table for the server.
185 */ 194 */
186static struct packet_type packets[] = { 195static struct packet_type packets[] = {
187 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 196 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
188 {"command", PC(PlayerCmd) PF_PLAYING }, 197 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
189 198
190 {"examine", PC(ExamineCmd) PF_PLAYING }, 199 {"examine", PC(ExamineCmd) PF_PLAYING },
200 {"ex", PC(ExCmd) PF_PLAYING },
191 {"apply", PC(ApplyCmd) PF_PLAYING }, 201 {"apply", PC(ApplyCmd) PF_PLAYING },
192 {"reply", PC(ReplyCmd) 0 },
193 {"lookat", PC(LookAt) PF_PLAYING }, 202 {"lookat", PC(LookAt) PF_PLAYING },
194 {"lock", PC(LockItem) PF_PLAYING }, 203 {"lock", PC(LockItem) PF_PLAYING },
195 {"mark", PC(MarkItem) PF_PLAYING }, 204 {"mark", PC(MarkItem) PF_PLAYING },
196 {"move", PC(MoveCmd) PF_PLAYING }, 205 {"move", PC(MoveCmd) PF_PLAYING },
197 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 206 {"ext", PC(ExtCmd) 0 }, // CF+
198 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 207 {"mapredraw", PC(MapRedrawCmd) 0 },
199 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 208 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
200 209
210 {"reply", SC(ReplyCmd) 0 },
201 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 211 {"exti", SC(ExtiCmd) 0 }, // CF+
202 {"addme", SC(AddMeCmd) 0 }, 212 {"addme", SC(AddMeCmd) 0 },
203 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ 213 {"askface", SC(AskFaceCmd) 0 },
204 {"requestinfo", SC(RequestInfo) 0 }, 214 {"requestinfo", SC(RequestInfo) 0 },
205 {"setfacemode", SC(SetFaceMode) 0 }, 215 {"setfacemode", SC(SetFaceMode) 0 },
206 {"setsound", SC(SetSound) 0 }, 216 {"setsound", SC(SetSound) 0 },
207 {"setup", SC(SetUp) 0 }, 217 {"setup", SC(SetUp) 0 },
208 {"version", SC(VersionCmd) 0 }, 218 {"version", SC(VersionCmd) 0 },
… …
213 223
214bool 224bool
215client::may_execute (const packet_type *pkt) const 225client::may_execute (const packet_type *pkt) const
216{ 226{
217 return (!(pkt->flags & PF_PLAYER) || pl) 227 return (!(pkt->flags & PF_PLAYER) || pl)
218 && (!(pkt->flags & PF_PLAYING) || (pl && pl->state == ST_PLAYING)); 228 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
229}
230
231// HACK: some commands currently should be executed
232// even when the player is frozen. this hack detects
233// those commands. it should be folded into may_execute,
234// but kept seperate to emphasise the hack aspect, i.e.
235// do it better, then remove.
236static bool
237always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
238{
239 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
240 return false;
241
242 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
243 return false;
244
245 if (pkt->flags & PF_COMMAND6)
246 {
247 data += 6;
248 len -= 6;
249 }
250
251 if (len > 4 && !strncmp (data, "say " , 4))
252 return true;
253 if (len > 5 && !strncmp (data, "chat ", 5))
254 return true;
255
256 return false;
219} 257}
220 258
221void 259void
222client::execute (const packet_type *pkt, char *data, int datalen) 260client::execute (const packet_type *pkt, char *data, int datalen)
223{ 261{
224 if (may_execute (pkt)) 262 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
225 { 263 {
226 //TODO: only one format 264 //TODO: only one format
227 if (pkt->flags & PF_PLAYER) 265 if (pkt->flags & PF_PLAYER)
228 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 266 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
229 else 267 else
… …
270 } 308 }
271 309
272 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) 310 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
273 if (!strcmp ((char *)inbuf + 2, pkt->name)) 311 if (!strcmp ((char *)inbuf + 2, pkt->name))
274 { 312 {
275 if (pkt->flags & PF_PLAYER) 313 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
276 queue_command (pkt, data, datalen); 314 queue_command (pkt, data, datalen);
277 else 315 else
278 execute (pkt, data, datalen); 316 execute (pkt, data, datalen);
279 317
280 goto next_packet; 318 goto next_packet;
… …
294// callback called when socket is either readable or writable 332// callback called when socket is either readable or writable
295void 333void
296client::socket_cb (iow &w, int got) 334client::socket_cb (iow &w, int got)
297{ 335{
298 //TODO remove when we have better socket cleanup logic 336 //TODO remove when we have better socket cleanup logic
299 if (status == Ns_Dead) 337 if (destroyed ())
300 { 338 {
301 socket_ev.poll (0); 339 socket_ev.poll (0);
302 return; 340 return;
303 } 341 }
304 342
… …
343 } 381 }
344 else 382 else
345 { 383 {
346 inbuf_len += amount; 384 inbuf_len += amount;
347 385
348 cst_tot.ibytes += amount;
349 cst_lst.ibytes += amount;
350
351 cmd_ev.start (); 386 cmd_ev.start ();
352 } 387 }
353 } 388 }
354} 389}
355 390
… …
377 */ 412 */
378void 413void
379client::send (void *buf_, int len) 414client::send (void *buf_, int len)
380{ 415{
381 char *buf = (char *)buf_; 416 char *buf = (char *)buf_;
382 char *pos = buf;
383 int amt = 0;
384 417
385 if (status == Ns_Dead || !buf) 418 if (destroyed () || !buf)
386 return; 419 return;
387 420
388 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 421 if (len + outputbuffer.len > SOCKETBUFSIZE)
389 { 422 {
390 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); 423 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
391 destroy (); 424 // shutdown the socket, this is safer than destroying it immediately
425 // as lots of code in the callchain might still access the map etc.
426 shutdown (fd, SHUT_RDWR);
392 return; 427 return;
393 } 428 }
394 429
395 int avail, end; 430 int avail, end;
396 431
… …
421 * shortcut function. 456 * shortcut function.
422 */ 457 */
423void 458void
424client::send_packet (packet &sl) 459client::send_packet (packet &sl)
425{ 460{
426 if (status == Ns_Dead) 461 if (destroyed ())
427 return; 462 return;
428 463
429 if (sl.length () >= MAXSOCKBUF) 464 if (sl.length () >= MAXSOCKBUF)
430 { 465 {
431 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 466 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
… …
472 va_end (ap); 507 va_end (ap);
473 508
474 send_packet (sl); 509 send_packet (sl);
475} 510}
476 511
512void
513client::send_drawinfo (const char *msg, int flags)
514{
515 send_packet_printf ("drawinfo %d %s", flags, msg);
516}
517
518void
519client::send_msg (int color, const char *type, const char *msg)
520{
521 if (can_msg)
522 send_packet_printf ("msg %d %s %s", color, type, msg);
523 else if (color < 0)
524 return; // client cannot handle this
525 else if (strchr (msg, '<') || strchr (msg, '&'))
526 {
527 //TODO: should escape/modify to old syntax
528 send_packet_printf ("drawinfo %d %s", color, msg);
529 }
530 else
531 send_packet_printf ("drawinfo %d %s", color, msg);
532}
533
477/*********************************************************************** 534/***********************************************************************
478 * 535 *
479 * packet functions/utilities 536 * packet functions/utilities
480 * 537 *
481 **********************************************************************/ 538 **********************************************************************/
482 539
540packet::packet (const char *name)
541{
542 reset ();
543
544 int len = strlen (name);
545 memcpy (cur, name, len); cur += len;
546 *cur++ = ' ';
547}
548
549packet &packet::operator <<(const ber32 v)
550{
551 enum { maxlen = 32 / 7 + 1};
552 uint8 buf[maxlen];
553 uint8 *p = buf + maxlen;
554 uint32 val = v.val;
555
556 *--p = val & 0x7F;
557
558 while (val > 0x7F)
559 {
560 val >>= 7;
561 *--p = (val & 0x7F) | 0x80;
562 }
563
564 return *this << data (p, buf + maxlen - p);
565}
566
483packet &packet::operator <<(const data &v) 567packet &packet::operator <<(const data &v)
484{ 568{
485 if (room () < v.len) 569 if (room () < v.len)
486 reset (); 570 reset ();
487 else 571 else
… …
524 return reset (); 608 return reset ();
525 609
526 cur += len; 610 cur += len;
527} 611}
528 612
529/******************************************************************************
530 *
531 * statistics logging functions.
532 *
533 ******************************************************************************/
534
535#ifdef CS_LOGSTATS
536
537/* cst_tot is for the life of the server, cst_last is for the last series of
538 * stats
539 */
540CS_Stats cst_tot, cst_lst;
541
542/**
543 * Writes out the gathered stats. We clear cst_lst.
544 */
545void
546write_cs_stats (void)
547{
548 time_t now = time (NULL);
549
550 /* If no connections recently, don't both to log anything */
551 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
552 return;
553
554 /* CSSTAT is put in so scripts can easily find the line */
555 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
556 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
557 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
558 cst_lst.ibytes = 0;
559 cst_lst.obytes = 0;
560 cst_lst.time_start = now;
561}
562#endif
563

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