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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.28 by root, Thu Dec 21 06:12:37 2006 UTC vs.
Revision 1.49 by root, Sun Jul 1 05:00:20 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#ifdef __linux__ 46 if (destroyed ())
47 return;
48
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 {
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; 60 if (tcpi.tcpi_snd_mss)
61 mss = tcpi.tcpi_snd_mss;
64 62
65 rtt = tcpi.tcpi_rtt; 63 rtt = tcpi.tcpi_rtt;
66 rttvar = tcpi.tcpi_rttvar; 64 rttvar = tcpi.tcpi_rttvar;
67 65
68 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s 66 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
69 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
70 { 67 {
68 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
69 write_outputbuffer ();
70
71 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,
72 (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);
73 destroy (); 73 destroy ();
74 }
74 } 75 }
75 } 76 }
76#endif 77#endif
77 78
78 /** 79 /**
… …
80 * 81 *
81 * 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
82 * is called to write it out. 83 * is called to write it out.
83 */ 84 */
84 85
85 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 && pl && pl->active)
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)
86 return; 101 return;
87 102
103 last_send = NOW;
88 write_outputbuffer (); 104 write_outputbuffer ();
89} 105}
90 106
91void 107void
92client::write_outputbuffer () 108client::write_outputbuffer ()
… …
102 /* wrap back to start of buffer */ 118 /* wrap back to start of buffer */
103 if (outputbuffer.start == SOCKETBUFSIZE) 119 if (outputbuffer.start == SOCKETBUFSIZE)
104 outputbuffer.start = 0; 120 outputbuffer.start = 0;
105 121
106 outputbuffer.len -= res; 122 outputbuffer.len -= res;
107#ifdef CS_LOGSTATS
108 cst_tot.obytes += res;
109 cst_lst.obytes += res;
110#endif
111 } 123 }
112 else if (res == 0) 124 else if (res == 0)
113 { 125 {
114 LOG (llevError, "socket write failed, connection closed.\n"); 126 LOG (llevError, "socket write failed, connection closed.\n");
115 destroy (); 127 destroy ();
… …
182 194
183/** 195/**
184 * Dispatch table for the server. 196 * Dispatch table for the server.
185 */ 197 */
186static struct packet_type packets[] = { 198static struct packet_type packets[] = {
187 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 199 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
188 {"command", PC(PlayerCmd) PF_PLAYING }, 200 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
189 201
190 {"examine", PC(ExamineCmd) PF_PLAYING }, 202 {"examine", PC(ExamineCmd) PF_PLAYING },
203 {"ex", PC(ExCmd) PF_PLAYING },
191 {"apply", PC(ApplyCmd) PF_PLAYING }, 204 {"apply", PC(ApplyCmd) PF_PLAYING },
192 {"lookat", PC(LookAt) PF_PLAYING }, 205 {"lookat", PC(LookAt) PF_PLAYING },
193 {"lock", PC(LockItem) PF_PLAYING }, 206 {"lock", PC(LockItem) PF_PLAYING },
194 {"mark", PC(MarkItem) PF_PLAYING }, 207 {"mark", PC(MarkItem) PF_PLAYING },
195 {"move", PC(MoveCmd) PF_PLAYING }, 208 {"move", PC(MoveCmd) PF_PLAYING },
196 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 209 {"ext", PC(ExtCmd) 0 }, // CF+
197 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 210 {"mapredraw", PC(MapRedrawCmd) 0 },
198 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 211 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
199 212
200 {"reply", SC(ReplyCmd) 0 }, 213 {"reply", SC(ReplyCmd) 0 },
201 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 214 {"exti", SC(ExtiCmd) 0 }, // CF+
202 {"addme", SC(AddMeCmd) 0 }, 215 {"addme", SC(AddMeCmd) 0 },
203 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ 216 {"askface", SC(AskFaceCmd) 0 },
204 {"requestinfo", SC(RequestInfo) 0 }, 217 {"requestinfo", SC(RequestInfo) 0 },
205 {"setfacemode", SC(SetFaceMode) 0 }, 218 {"setfacemode", SC(SetFaceMode) 0 },
206 {"setsound", SC(SetSound) 0 }, 219 {"setsound", SC(SetSound) 0 },
207 {"setup", SC(SetUp) 0 }, 220 {"setup", SC(SetUp) 0 },
208 {"version", SC(VersionCmd) 0 }, 221 {"version", SC(VersionCmd) 0 },
… …
213 226
214bool 227bool
215client::may_execute (const packet_type *pkt) const 228client::may_execute (const packet_type *pkt) const
216{ 229{
217 return (!(pkt->flags & PF_PLAYER) || pl) 230 return (!(pkt->flags & PF_PLAYER) || pl)
218 && (!(pkt->flags & PF_PLAYING) || (pl && pl->state == ST_PLAYING)); 231 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
232}
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;
219} 260}
220 261
221void 262void
222client::execute (const packet_type *pkt, char *data, int datalen) 263client::execute (const packet_type *pkt, char *data, int datalen)
223{ 264{
224 if (may_execute (pkt)) 265 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
225 { 266 {
226 //TODO: only one format 267 //TODO: only one format
227 if (pkt->flags & PF_PLAYER) 268 if (pkt->flags & PF_PLAYER)
228 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 269 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
229 else 270 else
… …
270 } 311 }
271 312
272 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)
273 if (!strcmp ((char *)inbuf + 2, pkt->name)) 314 if (!strcmp ((char *)inbuf + 2, pkt->name))
274 { 315 {
275 if (pkt->flags & PF_PLAYER) 316 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
276 queue_command (pkt, data, datalen); 317 queue_command (pkt, data, datalen);
277 else 318 else
278 execute (pkt, data, datalen); 319 execute (pkt, data, datalen);
279 320
280 goto next_packet; 321 goto next_packet;
… …
294// callback called when socket is either readable or writable 335// callback called when socket is either readable or writable
295void 336void
296client::socket_cb (iow &w, int got) 337client::socket_cb (iow &w, int got)
297{ 338{
298 //TODO remove when we have better socket cleanup logic 339 //TODO remove when we have better socket cleanup logic
299 if (destroyed) 340 if (destroyed ())
300 { 341 {
301 socket_ev.poll (0); 342 socket_ev.poll (0);
302 return; 343 return;
303 } 344 }
304 345
… …
343 } 384 }
344 else 385 else
345 { 386 {
346 inbuf_len += amount; 387 inbuf_len += amount;
347 388
348 cst_tot.ibytes += amount;
349 cst_lst.ibytes += amount;
350
351 cmd_ev.start (); 389 cmd_ev.start ();
352 } 390 }
353 } 391 }
354} 392}
355 393
… …
377 */ 415 */
378void 416void
379client::send (void *buf_, int len) 417client::send (void *buf_, int len)
380{ 418{
381 char *buf = (char *)buf_; 419 char *buf = (char *)buf_;
382 char *pos = buf;
383 int amt = 0;
384 420
385 if (destroyed || !buf) 421 if (destroyed () || !buf)
386 return; 422 return;
387 423
388 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 424 if (len + outputbuffer.len > SOCKETBUFSIZE)
389 { 425 {
390 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);
391 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);
392 return; 430 return;
393 } 431 }
394 432
395 int avail, end; 433 int avail, end;
396 434
… …
421 * shortcut function. 459 * shortcut function.
422 */ 460 */
423void 461void
424client::send_packet (packet &sl) 462client::send_packet (packet &sl)
425{ 463{
426 if (destroyed) 464 if (destroyed ())
427 return; 465 return;
428 466
429 if (sl.length () >= MAXSOCKBUF) 467 if (sl.length () >= MAXSOCKBUF)
430 { 468 {
431 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 469 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
… …
472 va_end (ap); 510 va_end (ap);
473 511
474 send_packet (sl); 512 send_packet (sl);
475} 513}
476 514
515// returns true when the message needs special (read: perl) treatment
516static bool
517msg_is_special (const char *msg)
518{
519 return msg [strcspn (msg, "<[&\n")];
520}
521
522void
523client::send_msg (int color, const char *type, const char *msg)
524{
525 if (msg_is_special (msg))
526 cfperl_send_msg (this, color, type, msg);
527 else if (can_msg)
528 send_packet_printf ("msg %d %s %s", color, type, msg);
529 else if (color < 0)
530 return; // client cannot handle this
531 else
532 send_packet_printf ("drawinfo %d %s", color, msg);
533}
534
535void
536client::send_drawinfo (const char *msg, int flags)
537{
538 send_msg (flags, "log", msg);
539}
540
477/*********************************************************************** 541/***********************************************************************
478 * 542 *
479 * packet functions/utilities 543 * packet functions/utilities
480 * 544 *
481 **********************************************************************/ 545 **********************************************************************/
… …
487 int len = strlen (name); 551 int len = strlen (name);
488 memcpy (cur, name, len); cur += len; 552 memcpy (cur, name, len); cur += len;
489 *cur++ = ' '; 553 *cur++ = ' ';
490} 554}
491 555
556packet &packet::operator <<(const ber32 v)
557{
558 enum { maxlen = 32 / 7 + 1};
559 uint8 buf[maxlen];
560 uint8 *p = buf + maxlen;
561 uint32 val = v.val;
562
563 *--p = val & 0x7F;
564
565 while (val > 0x7F)
566 {
567 val >>= 7;
568 *--p = (val & 0x7F) | 0x80;
569 }
570
571 return *this << data (p, buf + maxlen - p);
572}
573
492packet &packet::operator <<(const data &v) 574packet &packet::operator <<(const data &v)
493{ 575{
494 if (room () < v.len) 576 if (room () < v.len)
495 reset (); 577 reset ();
496 else 578 else
… …
533 return reset (); 615 return reset ();
534 616
535 cur += len; 617 cur += len;
536} 618}
537 619
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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