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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.29 by root, Thu Dec 21 23:37:06 2006 UTC vs.
Revision 1.51 by root, Sat Jul 28 00:15:03 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
50 // check about once per second, spread evenly over all clients
51 // do this only when player is active
52 if (!((pticks + fd) & 7) && pl && pl->active)
53 {
60 // check time of last ack, and, if too old, kill connection 54 // check time of last ack, and, if too old, kill connection
61 struct tcp_info tcpi;
62 socklen_t len = sizeof (tcpi); 55 socklen_t len = sizeof (tcpi);
63 56
64 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 57 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
65 { 58 {
66 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 59 if (tcpi.tcpi_snd_mss)
60 mss = tcpi.tcpi_snd_mss;
67 61
68 rtt = tcpi.tcpi_rtt; 62 fprintf (stderr, "uack %d sst %d cwnd %d mss %d pmtu %d\n",
69 rttvar = tcpi.tcpi_rttvar; 63 tcpi.tcpi_unacked, tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu);
70 64
71 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s 65 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
72 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
73 { 66 {
67 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
68 write_outputbuffer ();
69
74 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 70 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); 71 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
76 destroy (); 72 destroy ();
73 }
77 } 74 }
78 } 75 }
79#endif 76#endif
80 77
81 /** 78 /**
… …
83 * 80 *
84 * When the socket is clear to write, and we have backlogged data, this 81 * When the socket is clear to write, and we have backlogged data, this
85 * is called to write it out. 82 * is called to write it out.
86 */ 83 */
87 84
88 if (!outputbuffer.len || socket_ev.poll () & PE_W) 85 // write a nop to the socket at least every IDLE_NOP seconds.
86 if (!outputbuffer.len)
87 {
88 if (last_send + IDLE_PING <= NOW && pl && pl->active)
89 {
90 // this is a bit ugly, but map1/map1a seem to be the only
91 // nop'able commands and they are quite small.
92 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
93 send_packet (sl);
94 }
95 else
96 return;
97 }
98
99 if (socket_ev.poll () & PE_W)
89 return; 100 return;
90 101
102 last_send = NOW;
91 write_outputbuffer (); 103 write_outputbuffer ();
92} 104}
93 105
94void 106void
95client::write_outputbuffer () 107client::write_outputbuffer ()
… …
105 /* wrap back to start of buffer */ 117 /* wrap back to start of buffer */
106 if (outputbuffer.start == SOCKETBUFSIZE) 118 if (outputbuffer.start == SOCKETBUFSIZE)
107 outputbuffer.start = 0; 119 outputbuffer.start = 0;
108 120
109 outputbuffer.len -= res; 121 outputbuffer.len -= res;
110#ifdef CS_LOGSTATS
111 cst_tot.obytes += res;
112 cst_lst.obytes += res;
113#endif
114 } 122 }
115 else if (res == 0) 123 else if (res == 0)
116 { 124 {
117 LOG (llevError, "socket write failed, connection closed.\n"); 125 LOG (llevError, "socket write failed, connection closed.\n");
118 destroy (); 126 destroy ();
… …
185 193
186/** 194/**
187 * Dispatch table for the server. 195 * Dispatch table for the server.
188 */ 196 */
189static struct packet_type packets[] = { 197static struct packet_type packets[] = {
190 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 198 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
191 {"command", PC(PlayerCmd) PF_PLAYING }, 199 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
192 200
193 {"examine", PC(ExamineCmd) PF_PLAYING }, 201 {"examine", PC(ExamineCmd) PF_PLAYING },
202 {"ex", PC(ExCmd) PF_PLAYING },
194 {"apply", PC(ApplyCmd) PF_PLAYING }, 203 {"apply", PC(ApplyCmd) PF_PLAYING },
195 {"lookat", PC(LookAt) PF_PLAYING }, 204 {"lookat", PC(LookAt) PF_PLAYING },
196 {"lock", PC(LockItem) PF_PLAYING }, 205 {"lock", PC(LockItem) PF_PLAYING },
197 {"mark", PC(MarkItem) PF_PLAYING }, 206 {"mark", PC(MarkItem) PF_PLAYING },
198 {"move", PC(MoveCmd) PF_PLAYING }, 207 {"move", PC(MoveCmd) PF_PLAYING },
199 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 208 {"ext", PC(ExtCmd) 0 }, // CF+
200 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 209 {"mapredraw", PC(MapRedrawCmd) 0 },
201 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 210 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
202 211
203 {"reply", SC(ReplyCmd) 0 }, 212 {"reply", SC(ReplyCmd) 0 },
204 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 213 {"exti", SC(ExtiCmd) 0 }, // CF+
205 {"addme", SC(AddMeCmd) 0 }, 214 {"addme", SC(AddMeCmd) 0 },
206 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ 215 {"askface", SC(AskFaceCmd) 0 },
207 {"requestinfo", SC(RequestInfo) 0 }, 216 {"requestinfo", SC(RequestInfo) 0 },
208 {"setfacemode", SC(SetFaceMode) 0 }, 217 {"setfacemode", SC(SetFaceMode) 0 },
209 {"setsound", SC(SetSound) 0 }, 218 {"setsound", SC(SetSound) 0 },
210 {"setup", SC(SetUp) 0 }, 219 {"setup", SC(SetUp) 0 },
211 {"version", SC(VersionCmd) 0 }, 220 {"version", SC(VersionCmd) 0 },
… …
219{ 228{
220 return (!(pkt->flags & PF_PLAYER) || pl) 229 return (!(pkt->flags & PF_PLAYER) || pl)
221 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); 230 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
222} 231}
223 232
233// HACK: some commands currently should be executed
234// even when the player is frozen. this hack detects
235// those commands. it should be folded into may_execute,
236// but kept seperate to emphasise the hack aspect, i.e.
237// do it better, then remove.
238static bool
239always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
240{
241 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
242 return false;
243
244 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
245 return false;
246
247 if (pkt->flags & PF_COMMAND6)
248 {
249 data += 6;
250 len -= 6;
251 }
252
253 if (len > 4 && !strncmp (data, "say " , 4))
254 return true;
255 if (len > 5 && !strncmp (data, "chat ", 5))
256 return true;
257
258 return false;
259}
260
224void 261void
225client::execute (const packet_type *pkt, char *data, int datalen) 262client::execute (const packet_type *pkt, char *data, int datalen)
226{ 263{
227 if (may_execute (pkt)) 264 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
228 { 265 {
229 //TODO: only one format 266 //TODO: only one format
230 if (pkt->flags & PF_PLAYER) 267 if (pkt->flags & PF_PLAYER)
231 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 268 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
232 else 269 else
… …
273 } 310 }
274 311
275 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) 312 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
276 if (!strcmp ((char *)inbuf + 2, pkt->name)) 313 if (!strcmp ((char *)inbuf + 2, pkt->name))
277 { 314 {
278 if (pkt->flags & PF_PLAYER) 315 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
279 queue_command (pkt, data, datalen); 316 queue_command (pkt, data, datalen);
280 else 317 else
281 execute (pkt, data, datalen); 318 execute (pkt, data, datalen);
282 319
283 goto next_packet; 320 goto next_packet;
… …
346 } 383 }
347 else 384 else
348 { 385 {
349 inbuf_len += amount; 386 inbuf_len += amount;
350 387
351 cst_tot.ibytes += amount;
352 cst_lst.ibytes += amount;
353
354 cmd_ev.start (); 388 cmd_ev.start ();
355 } 389 }
356 } 390 }
357} 391}
358 392
… …
380 */ 414 */
381void 415void
382client::send (void *buf_, int len) 416client::send (void *buf_, int len)
383{ 417{
384 char *buf = (char *)buf_; 418 char *buf = (char *)buf_;
385 char *pos = buf;
386 int amt = 0;
387 419
388 if (destroyed () || !buf) 420 if (destroyed () || !buf)
389 return; 421 return;
390 422
391 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 423 if (len + outputbuffer.len > SOCKETBUFSIZE)
392 { 424 {
393 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); 425 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
394 destroy (); 426 // shutdown the socket, this is safer than destroying it immediately
427 // as lots of code in the callchain might still access the map etc.
428 shutdown (fd, SHUT_RDWR);
395 return; 429 return;
396 } 430 }
397 431
398 int avail, end; 432 int avail, end;
399 433
… …
475 va_end (ap); 509 va_end (ap);
476 510
477 send_packet (sl); 511 send_packet (sl);
478} 512}
479 513
514// returns true when the message needs special (read: perl) treatment
515static bool
516msg_is_special (const char *msg)
517{
518 return msg [strcspn (msg, "<[&\n")];
519}
520
521void
522client::send_msg (int color, const char *type, const char *msg)
523{
524 if (msg_is_special (msg))
525 cfperl_send_msg (this, color, type, msg);
526 else if (can_msg)
527 send_packet_printf ("msg %d %s %s", color, type, msg);
528 else if (color < 0)
529 return; // client cannot handle this
530 else
531 send_packet_printf ("drawinfo %d %s", color, msg);
532}
533
534void
535client::send_drawinfo (const char *msg, int flags)
536{
537 send_msg (flags, "log", msg);
538}
539
480/*********************************************************************** 540/***********************************************************************
481 * 541 *
482 * packet functions/utilities 542 * packet functions/utilities
483 * 543 *
484 **********************************************************************/ 544 **********************************************************************/
… …
490 int len = strlen (name); 550 int len = strlen (name);
491 memcpy (cur, name, len); cur += len; 551 memcpy (cur, name, len); cur += len;
492 *cur++ = ' '; 552 *cur++ = ' ';
493} 553}
494 554
555packet &packet::operator <<(const ber32 v)
556{
557 enum { maxlen = 32 / 7 + 1};
558 uint8 buf[maxlen];
559 uint8 *p = buf + maxlen;
560 uint32 val = v.val;
561
562 *--p = val & 0x7F;
563
564 while (val > 0x7F)
565 {
566 val >>= 7;
567 *--p = (val & 0x7F) | 0x80;
568 }
569
570 return *this << data (p, buf + maxlen - p);
571}
572
495packet &packet::operator <<(const data &v) 573packet &packet::operator <<(const data &v)
496{ 574{
497 if (room () < v.len) 575 if (room () < v.len)
498 reset (); 576 reset ();
499 else 577 else
… …
536 return reset (); 614 return reset ();
537 615
538 cur += len; 616 cur += len;
539} 617}
540 618
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

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