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 1.31 by root, Mon Jan 15 02:39:41 2007 UTC vs.
Revision 1.54 by root, Sun Jul 29 02:24:34 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 (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
8 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
9 the Free Software Foundation; either version 2 of the License, or 9 * the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version. 10 * (at your option) 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,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details. 15 * GNU General Public License 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
18 along with this program; if not, write to the Free Software 18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, 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 * 19 *
28 * \date 2003-12-02 20 * 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 */ 21 */
35 22
36using namespace std; 23using namespace std;
37 24
38#include <global.h> 25#include <global.h>
39#include <sproto.h> 26#include <sproto.h>
40#include <cstdarg> 27#include <cstdarg>
41 28
42#ifdef __linux__ 29#if HAVE_TCP_INFO
43# include <sys/types.h> 30# include <sys/types.h>
44# include <sys/socket.h> 31# include <sys/socket.h>
45# include <netinet/in.h> 32# include <netinet/in.h>
46# include <netinet/tcp.h> 33# include <netinet/tcp.h>
47#endif 34#endif
48 35
49// 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
50// easily die in 20 seconds...
51#define SOCKET_TIMEOUT1 10 * 1000 37#define SOCKET_TIMEOUT 8.
52#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.
53 42
54void 43void
55client::flush () 44client::flush ()
56{ 45{
57 if (destroyed ()) 46 if (destroyed ())
58 return; 47 return;
59 48
60#ifdef __linux__ 49#if HAVE_TCP_INFO
61 // check time of last ack, and, if too old, kill connection 50 // check time of last ack, and, if too old, kill connection
62 struct tcp_info tcpi;
63 socklen_t len = sizeof (tcpi); 51 socklen_t len = sizeof (tcpi);
64 52
65 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))
66 { 54 {
67 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;
68 57
69 rtt = tcpi.tcpi_rtt; 58#if 0
70 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
71 69
72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s 70 // do this only when player is active
73 && 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))
74 { 73 {
74 send_msg (NDI_RED | NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
75 write_outputbuffer ();
76
75 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,
76 (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);
77 destroy (); 79 destroy ();
78 } 80 }
79 } 81 }
80#endif 82#endif
81 83
… …
84 * 86 *
85 * 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
86 * is called to write it out. 88 * is called to write it out.
87 */ 89 */
88 90
89 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)
90 return; 106 return;
91 107
108 last_send = NOW;
92 write_outputbuffer (); 109 write_outputbuffer ();
93} 110}
94 111
95void 112void
96client::write_outputbuffer () 113client::write_outputbuffer ()
… …
106 /* wrap back to start of buffer */ 123 /* wrap back to start of buffer */
107 if (outputbuffer.start == SOCKETBUFSIZE) 124 if (outputbuffer.start == SOCKETBUFSIZE)
108 outputbuffer.start = 0; 125 outputbuffer.start = 0;
109 126
110 outputbuffer.len -= res; 127 outputbuffer.len -= res;
111#ifdef CS_LOGSTATS
112 cst_tot.obytes += res;
113 cst_lst.obytes += res;
114#endif
115 } 128 }
116 else if (res == 0) 129 else if (res == 0)
117 { 130 {
118 LOG (llevError, "socket write failed, connection closed.\n"); 131 LOG (llevError, "socket write failed, connection closed.\n");
119 destroy (); 132 destroy ();
… …
157 if (inbuf_len >= 2 + pkt_len) 170 if (inbuf_len >= 2 + pkt_len)
158 return 2 + pkt_len; 171 return 2 + pkt_len;
159 172
160 if (inbuf_len == sizeof (inbuf)) 173 if (inbuf_len == sizeof (inbuf))
161 { 174 {
162 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);
163 destroy (); 176 destroy ();
164 return -1; 177 return -1;
165 } 178 }
166 } 179 }
167 180
… …
186 199
187/** 200/**
188 * Dispatch table for the server. 201 * Dispatch table for the server.
189 */ 202 */
190static struct packet_type packets[] = { 203static struct packet_type packets[] = {
191 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 204 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
192 {"command", PC(PlayerCmd) PF_PLAYING }, 205 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
193 206
194 {"examine", PC(ExamineCmd) PF_PLAYING }, 207 {"examine", PC(ExamineCmd) PF_PLAYING },
208 {"ex", PC(ExCmd) PF_PLAYING },
195 {"apply", PC(ApplyCmd) PF_PLAYING }, 209 {"apply", PC(ApplyCmd) PF_PLAYING },
196 {"lookat", PC(LookAt) PF_PLAYING }, 210 {"lookat", PC(LookAt) PF_PLAYING },
197 {"lock", PC(LockItem) PF_PLAYING }, 211 {"lock", PC(LockItem) PF_PLAYING },
198 {"mark", PC(MarkItem) PF_PLAYING }, 212 {"mark", PC(MarkItem) PF_PLAYING },
199 {"move", PC(MoveCmd) PF_PLAYING }, 213 {"move", PC(MoveCmd) PF_PLAYING },
200 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 214 {"ext", PC(ExtCmd) 0 }, // CF+
201 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 215 {"mapredraw", PC(MapRedrawCmd) 0 },
202 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 216 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
203 217
204 {"reply", SC(ReplyCmd) 0 }, 218 {"reply", SC(ReplyCmd) 0 },
205 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 219 {"exti", SC(ExtiCmd) 0 }, // CF+
206 {"addme", SC(AddMeCmd) 0 }, 220 {"addme", SC(AddMeCmd) 0 },
207 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ 221 {"askface", SC(AskFaceCmd) 0 },
208 {"requestinfo", SC(RequestInfo) 0 }, 222 {"requestinfo", SC(RequestInfo) 0 },
209 {"setfacemode", SC(SetFaceMode) 0 }, 223 {"setfacemode", SC(SetFaceMode) 0 },
210 {"setsound", SC(SetSound) 0 }, 224 {"setsound", SC(SetSound) 0 },
211 {"setup", SC(SetUp) 0 }, 225 {"setup", SC(SetUp) 0 },
212 {"version", SC(VersionCmd) 0 }, 226 {"version", SC(VersionCmd) 0 },
… …
220{ 234{
221 return (!(pkt->flags & PF_PLAYER) || pl) 235 return (!(pkt->flags & PF_PLAYER) || pl)
222 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); 236 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
223} 237}
224 238
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
225void 267void
226client::execute (const packet_type *pkt, char *data, int datalen) 268client::execute (const packet_type *pkt, char *data, int datalen)
227{ 269{
228 if (may_execute (pkt)) 270 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
229 { 271 {
230 //TODO: only one format 272 //TODO: only one format
231 if (pkt->flags & PF_PLAYER) 273 if (pkt->flags & PF_PLAYER)
232 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 274 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
233 else 275 else
234 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 276 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
235 } 277 }
236 else 278 else
237 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);
238} 280}
239 281
240bool 282bool
241client::handle_packet () 283client::handle_packet ()
242{ 284{
… …
274 } 316 }
275 317
276 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)
277 if (!strcmp ((char *)inbuf + 2, pkt->name)) 319 if (!strcmp ((char *)inbuf + 2, pkt->name))
278 { 320 {
279 if (pkt->flags & PF_PLAYER) 321 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
280 queue_command (pkt, data, datalen); 322 queue_command (pkt, data, datalen);
281 else 323 else
282 execute (pkt, data, datalen); 324 execute (pkt, data, datalen);
283 325
284 goto next_packet; 326 goto next_packet;
285 } 327 }
286 328
287 // If we get here, we didn't find a valid command. 329 // If we get here, we didn't find a valid command.
288 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);
289next_packet: 331next_packet:
290 skip_packet (pkt_len); 332 skip_packet (pkt_len);
291 333
292 // input buffer has space again 334 // input buffer has space again
293 socket_ev.poll (socket_ev.poll () | PE_R); 335 socket_ev.poll (socket_ev.poll () | PE_R);
… …
347 } 389 }
348 else 390 else
349 { 391 {
350 inbuf_len += amount; 392 inbuf_len += amount;
351 393
352 cst_tot.ibytes += amount;
353 cst_lst.ibytes += amount;
354
355 cmd_ev.start (); 394 cmd_ev.start ();
356 } 395 }
357 } 396 }
358} 397}
359 398
… …
381 */ 420 */
382void 421void
383client::send (void *buf_, int len) 422client::send (void *buf_, int len)
384{ 423{
385 char *buf = (char *)buf_; 424 char *buf = (char *)buf_;
386 char *pos = buf;
387 int amt = 0;
388 425
389 if (destroyed () || !buf) 426 if (destroyed () || !buf)
390 return; 427 return;
391 428
392 if (len + outputbuffer.len > SOCKETBUFSIZE) 429 if (len + outputbuffer.len > SOCKETBUFSIZE)
393 { 430 {
394 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);
395 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);
396 return; 435 return;
397 } 436 }
398 437
399 int avail, end; 438 int avail, end;
400 439
… …
476 va_end (ap); 515 va_end (ap);
477 516
478 send_packet (sl); 517 send_packet (sl);
479} 518}
480 519
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
481/*********************************************************************** 546/***********************************************************************
482 * 547 *
483 * packet functions/utilities 548 * packet functions/utilities
484 * 549 *
485 **********************************************************************/ 550 **********************************************************************/
… …
491 int len = strlen (name); 556 int len = strlen (name);
492 memcpy (cur, name, len); cur += len; 557 memcpy (cur, name, len); cur += len;
493 *cur++ = ' '; 558 *cur++ = ' ';
494} 559}
495 560
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
496packet &packet::operator <<(const data &v) 579packet &packet::operator <<(const data &v)
497{ 580{
498 if (room () < v.len) 581 if (room () < v.len)
499 reset (); 582 reset ();
500 else 583 else
… …
537 return reset (); 620 return reset ();
538 621
539 cur += len; 622 cur += len;
540} 623}
541 624
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

Diff Legend

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