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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.30 by pippijn, Sat Jan 6 14:42:31 2007 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 (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team 4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
5 Copyright (C) 1992 Frank Tore Johansen 5 * Copyright (©) 1992,2007 Frank Tore Johansen
6 6 *
7 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
8 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
9 the Free Software Foundation; either version 2 of the License, or 9 * Software Foundation; either version 2 of the License, or (at your option)
10 (at your option) any later version. 10 * any later version.
11 11 *
12 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
13 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 GNU General Public License for more details. 15 * for more details.
16 16 *
17 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
18 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
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
21 The author can be reached via e-mail to mark@pyramid.com
22*/
23
24/**
25 * \file
26 * Low-level socket-related functions.
27 * 20 *
28 * \date 2003-12-02 21 * The authors can be reached via e-mail to <crossfire@schmorp.de>
29 *
30 * Contains some base functions that both the client and server
31 * can use. As such, depending what we are being compiled for will
32 * determine what we can include. the client is designed have
33 * CFCLIENT defined as part of its compile flags.
34 */ 22 */
35 23
36using namespace std; 24using namespace std;
37 25
38#include <global.h> 26#include <global.h>
39#include <sproto.h> 27#include <sproto.h>
40#include <cstdarg> 28#include <cstdarg>
41 29
42#ifdef __linux__ 30#if HAVE_TCP_INFO
43# include <sys/types.h> 31# include <sys/types.h>
44# include <sys/socket.h> 32# include <sys/socket.h>
45# include <netinet/in.h> 33# include <netinet/in.h>
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 * 1000 38#define SOCKET_TIMEOUT 8.
52#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.
53 43
54void 44void
55client::flush () 45client::flush ()
56{ 46{
57 if (destroyed ()) 47 if (destroyed ())
58 return; 48 return;
59 49
60#ifdef __linux__ 50#if HAVE_TCP_INFO
51 // check about once per second, spread evenly over all clients
52 if (!((pticks + fd) & 7))
53 {
61 // check time of last ack, and, if too old, kill connection 54 // check time of last ack, and, if too old, kill connection
62 struct tcp_info tcpi; 55 struct tcp_info tcpi;
63 socklen_t len = sizeof (tcpi); 56 socklen_t len = sizeof (tcpi);
64 57
65 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))
66 { 59 {
67 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;
68 62
69 rtt = tcpi.tcpi_rtt; 63 rtt = tcpi.tcpi_rtt;
70 rttvar = tcpi.tcpi_rttvar; 64 rttvar = tcpi.tcpi_rttvar;
71 65
72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s 66 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
73 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
74 { 67 {
68 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
69 write_outputbuffer ();
70
75 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,
76 (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);
77 destroy (); 73 destroy ();
74 }
78 } 75 }
79 } 76 }
80#endif 77#endif
81 78
82 /** 79 /**
… …
84 * 81 *
85 * 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
86 * is called to write it out. 83 * is called to write it out.
87 */ 84 */
88 85
89 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)
90 return; 101 return;
91 102
103 last_send = NOW;
92 write_outputbuffer (); 104 write_outputbuffer ();
93} 105}
94 106
95void 107void
96client::write_outputbuffer () 108client::write_outputbuffer ()
… …
106 /* wrap back to start of buffer */ 118 /* wrap back to start of buffer */
107 if (outputbuffer.start == SOCKETBUFSIZE) 119 if (outputbuffer.start == SOCKETBUFSIZE)
108 outputbuffer.start = 0; 120 outputbuffer.start = 0;
109 121
110 outputbuffer.len -= res; 122 outputbuffer.len -= res;
111#ifdef CS_LOGSTATS
112 cst_tot.obytes += res;
113 cst_lst.obytes += res;
114#endif
115 } 123 }
116 else if (res == 0) 124 else if (res == 0)
117 { 125 {
118 LOG (llevError, "socket write failed, connection closed.\n"); 126 LOG (llevError, "socket write failed, connection closed.\n");
119 destroy (); 127 destroy ();
… …
186 194
187/** 195/**
188 * Dispatch table for the server. 196 * Dispatch table for the server.
189 */ 197 */
190static struct packet_type packets[] = { 198static struct packet_type packets[] = {
191 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 199 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
192 {"command", PC(PlayerCmd) PF_PLAYING }, 200 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
193 201
194 {"examine", PC(ExamineCmd) PF_PLAYING }, 202 {"examine", PC(ExamineCmd) PF_PLAYING },
203 {"ex", PC(ExCmd) PF_PLAYING },
195 {"apply", PC(ApplyCmd) PF_PLAYING }, 204 {"apply", PC(ApplyCmd) PF_PLAYING },
196 {"lookat", PC(LookAt) PF_PLAYING }, 205 {"lookat", PC(LookAt) PF_PLAYING },
197 {"lock", PC(LockItem) PF_PLAYING }, 206 {"lock", PC(LockItem) PF_PLAYING },
198 {"mark", PC(MarkItem) PF_PLAYING }, 207 {"mark", PC(MarkItem) PF_PLAYING },
199 {"move", PC(MoveCmd) PF_PLAYING }, 208 {"move", PC(MoveCmd) PF_PLAYING },
200 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 209 {"ext", PC(ExtCmd) 0 }, // CF+
201 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 210 {"mapredraw", PC(MapRedrawCmd) 0 },
202 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 211 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
203 212
204 {"reply", SC(ReplyCmd) 0 }, 213 {"reply", SC(ReplyCmd) 0 },
205 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 214 {"exti", SC(ExtiCmd) 0 }, // CF+
206 {"addme", SC(AddMeCmd) 0 }, 215 {"addme", SC(AddMeCmd) 0 },
207 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ 216 {"askface", SC(AskFaceCmd) 0 },
208 {"requestinfo", SC(RequestInfo) 0 }, 217 {"requestinfo", SC(RequestInfo) 0 },
209 {"setfacemode", SC(SetFaceMode) 0 }, 218 {"setfacemode", SC(SetFaceMode) 0 },
210 {"setsound", SC(SetSound) 0 }, 219 {"setsound", SC(SetSound) 0 },
211 {"setup", SC(SetUp) 0 }, 220 {"setup", SC(SetUp) 0 },
212 {"version", SC(VersionCmd) 0 }, 221 {"version", SC(VersionCmd) 0 },
… …
220{ 229{
221 return (!(pkt->flags & PF_PLAYER) || pl) 230 return (!(pkt->flags & PF_PLAYER) || pl)
222 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); 231 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
223} 232}
224 233
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;
260}
261
225void 262void
226client::execute (const packet_type *pkt, char *data, int datalen) 263client::execute (const packet_type *pkt, char *data, int datalen)
227{ 264{
228 if (may_execute (pkt)) 265 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
229 { 266 {
230 //TODO: only one format 267 //TODO: only one format
231 if (pkt->flags & PF_PLAYER) 268 if (pkt->flags & PF_PLAYER)
232 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 269 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
233 else 270 else
… …
274 } 311 }
275 312
276 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)
277 if (!strcmp ((char *)inbuf + 2, pkt->name)) 314 if (!strcmp ((char *)inbuf + 2, pkt->name))
278 { 315 {
279 if (pkt->flags & PF_PLAYER) 316 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
280 queue_command (pkt, data, datalen); 317 queue_command (pkt, data, datalen);
281 else 318 else
282 execute (pkt, data, datalen); 319 execute (pkt, data, datalen);
283 320
284 goto next_packet; 321 goto next_packet;
… …
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
… …
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 (destroyed () || !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
… …
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 **********************************************************************/
… …
491 int len = strlen (name); 547 int len = strlen (name);
492 memcpy (cur, name, len); cur += len; 548 memcpy (cur, name, len); cur += len;
493 *cur++ = ' '; 549 *cur++ = ' ';
494} 550}
495 551
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
496packet &packet::operator <<(const data &v) 570packet &packet::operator <<(const data &v)
497{ 571{
498 if (room () < v.len) 572 if (room () < v.len)
499 reset (); 573 reset ();
500 else 574 else
… …
537 return reset (); 611 return reset ();
538 612
539 cur += len; 613 cur += len;
540} 614}
541 615
542/******************************************************************************
543 *
544 * statistics logging functions.
545 *
546 ******************************************************************************/
547
548#ifdef CS_LOGSTATS
549
550/* cst_tot is for the life of the server, cst_last is for the last series of
551 * stats
552 */
553CS_Stats cst_tot, cst_lst;
554
555/**
556 * Writes out the gathered stats. We clear cst_lst.
557 */
558void
559write_cs_stats (void)
560{
561 time_t now = time (NULL);
562
563 /* If no connections recently, don't both to log anything */
564 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
565 return;
566
567 /* CSSTAT is put in so scripts can easily find the line */
568 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
569 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
570 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
571 cst_lst.ibytes = 0;
572 cst_lst.obytes = 0;
573 cst_lst.time_start = now;
574}
575#endif
576

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