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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.25 by root, Sun Dec 17 19:14:00 2006 UTC vs.
Revision 1.71 by root, Mon Oct 12 14:00:59 2009 UTC

1/* 1/*
2 CrossFire, A Multiplayer game for X-windows 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 3 *
4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra 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 * Deliantra is free software: you can redistribute it and/or modify it under
7 it under the terms of the GNU General Public License as published by 8 * the terms of the Affero GNU General Public License as published by the
8 the Free Software Foundation; either version 2 of the License, or 9 * Free Software Foundation, either version 3 of the License, or (at your
9 (at your option) any later version. 10 * 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 Affero GNU General Public License
17 along with this program; if not, write to the Free Software 18 * and the GNU General Public License along with this program. If not, see
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 * <http://www.gnu.org/licenses/>.
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 <support@deliantra.net>
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# define TCP_HZ 1000 // sorry...
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// force a packet when idle for more than this many seconds,
50// easily die in 20 seconds... 38// forcing an ack regularly.
51#define SOCKET_TIMEOUT1 10 39#define IDLE_PING 2.
52#define SOCKET_TIMEOUT2 20
53 40
54void 41void
55client::flush () 42client::flush ()
56{ 43{
57#ifdef __linux__ 44 if (destroyed ())
58 // check time of last ack, and, if too old, kill connection 45 return;
59 struct tcp_info tcpi;
60 socklen_t len = sizeof (tcpi);
61
62 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
63 {
64 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
65
66 rtt = tcpi.tcpi_rtt;
67 rttvar = tcpi.tcpi_rttvar;
68
69 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s
70 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
71 {
72 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
73 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
74 destroy ();
75 }
76 }
77#endif
78 46
79 /** 47 /**
80 * Writes data to socket. 48 * Writes data to socket.
81 * 49 *
82 * When the socket is clear to write, and we have backlogged data, this 50 * When the socket is clear to write, and we have backlogged data, this
83 * is called to write it out. 51 * is called to write it out.
84 */ 52 */
85 53
86 if (!outputbuffer.len || socket_ev.poll () & PE_W) 54 // write a nop to the socket at least every IDLE_NOP seconds.
55 if (!outputbuffer.len)
56 {
57 if (last_send + IDLE_PING <= NOW && pl && pl->active)
58 {
59 // this is a bit ugly, but map1/map1a seem to be the only
60 // nop'able commands and they are quite small.
61 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
62 send_packet (sl);
63 }
64 else
65 return;
66 }
67
68 if (socket_ev.poll () & EV_WRITE)
87 return; 69 return;
88 70
71 last_send = NOW;
89 write_outputbuffer (); 72 write_outputbuffer ();
90} 73}
91 74
92void 75void
93client::write_outputbuffer () 76client::write_outputbuffer ()
… …
103 /* wrap back to start of buffer */ 86 /* wrap back to start of buffer */
104 if (outputbuffer.start == SOCKETBUFSIZE) 87 if (outputbuffer.start == SOCKETBUFSIZE)
105 outputbuffer.start = 0; 88 outputbuffer.start = 0;
106 89
107 outputbuffer.len -= res; 90 outputbuffer.len -= res;
108#ifdef CS_LOGSTATS
109 cst_tot.obytes += res;
110 cst_lst.obytes += res;
111#endif
112 } 91 }
113 else if (res == 0) 92 else if (res == 0)
114 { 93 {
115 LOG (llevError, "socket write failed, connection closed.\n"); 94 LOG (llevError, "socket write failed, connection closed.\n");
116 destroy (); 95 destroy ();
… …
121 // just retry 100 // just retry
122 } 101 }
123 else if (errno == EAGAIN) 102 else if (errno == EAGAIN)
124 { 103 {
125 // delay till ready 104 // delay till ready
126 socket_ev.poll (socket_ev.poll () | PE_W); 105 socket_ev.poll (socket_ev.poll () | EV_WRITE);
127 socket_ev.start (); 106 socket_ev.start ();
128 return; 107 return;
129 } 108 }
130 else 109 else
131 { 110 {
… …
133 destroy (); 112 destroy ();
134 return; 113 return;
135 } 114 }
136 } 115 }
137 116
138 socket_ev.poll (socket_ev.poll () & ~PE_W); 117 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
139} 118}
140 119
141/****************************************************************************** 120/******************************************************************************
142 * 121 *
143 * Start of read routines. 122 * Start of read routines.
… …
154 if (inbuf_len >= 2 + pkt_len) 133 if (inbuf_len >= 2 + pkt_len)
155 return 2 + pkt_len; 134 return 2 + pkt_len;
156 135
157 if (inbuf_len == sizeof (inbuf)) 136 if (inbuf_len == sizeof (inbuf))
158 { 137 {
159 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED); 138 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY);
160 destroy (); 139 destroy ();
161 return -1; 140 return -1;
162 } 141 }
163 } 142 }
164 143
… …
183 162
184/** 163/**
185 * Dispatch table for the server. 164 * Dispatch table for the server.
186 */ 165 */
187static struct packet_type packets[] = { 166static struct packet_type packets[] = {
188 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 167 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
189 {"command", PC(PlayerCmd) PF_PLAYING }, 168 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
190 169
191 {"examine", PC(ExamineCmd) PF_PLAYING }, 170 {"examine", PC(ExamineCmd) PF_PLAYING },
171 {"ex", PC(ExCmd) PF_PLAYING },
192 {"apply", PC(ApplyCmd) PF_PLAYING }, 172 {"apply", PC(ApplyCmd) PF_PLAYING },
193 {"reply", PC(ReplyCmd) PF_IMMEDIATE },
194 {"lookat", PC(LookAt) PF_PLAYING }, 173 {"lookat", PC(LookAt) PF_PLAYING },
195 {"lock", PC(LockItem) PF_PLAYING }, 174 {"lock", PC(LockItem) PF_PLAYING },
196 {"mark", PC(MarkItem) PF_PLAYING }, 175 {"mark", PC(MarkItem) PF_PLAYING },
197 {"move", PC(MoveCmd) PF_PLAYING }, 176 {"move", PC(MoveCmd) PF_PLAYING },
198 {"exti", PC(ExtCmd) PF_IMMEDIATE }, /* CF+ */
199 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 177 {"ext", PC(ExtCmd) 0 }, // CF+
200 {"mapredraw", PC(MapRedrawCmd) PF_IMMEDIATE }, /* Added: phil */ 178 {"mapredraw", PC(MapRedrawCmd) 0 },
201 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 179 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
202 180
181 {"reply", SC(ReplyCmd) 0 },
182 {"exti", SC(ExtiCmd) 0 }, // CF+
203 {"addme", SC(AddMeCmd) PF_IMMEDIATE }, 183 {"addme", SC(AddMeCmd) 0 },
204 {"askface", SC(SendFaceCmd) PF_IMMEDIATE }, /* Added: phil */ 184 {"askface", SC(AskFaceCmd) 0 },
205 {"requestinfo", SC(RequestInfo) PF_IMMEDIATE }, 185 {"requestinfo", SC(RequestInfo) 0 },
206 {"setfacemode", SC(SetFaceMode) PF_IMMEDIATE },
207 {"setsound", SC(SetSound) PF_IMMEDIATE }, 186 {"setsound", SC(SetSound) 0 },
208 {"setup", SC(SetUp) PF_IMMEDIATE }, 187 {"setup", SC(SetUp) 0 },
209 {"version", SC(VersionCmd) PF_IMMEDIATE }, 188 {"version", SC(VersionCmd) 0 },
210 {"toggleextendedinfos", SC(ToggleExtendedInfos) PF_IMMEDIATE }, /*Added: tchize */
211 {"toggleextendedtext", SC(ToggleExtendedText) PF_IMMEDIATE }, /*Added: tchize */ 189 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
212 {"asksmooth", SC(AskSmooth) PF_IMMEDIATE }, /*Added: tchize (smoothing technologies) */
213}; 190};
214 191
215bool 192bool
216client::may_execute (const packet_type *pkt) const 193client::may_execute (const packet_type *pkt) const
217{ 194{
218 return (!(pkt->flags & PF_PLAYER) || pl) 195 return (!(pkt->flags & PF_PLAYER) || pl)
219 && (!(pkt->flags & PF_PLAYING) || (pl && pl->state == ST_PLAYING)); 196 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
197}
198
199// HACK: some commands currently should be executed
200// even when the player is frozen. this hack detects
201// those commands. it should be folded into may_execute,
202// but kept seperate to emphasise the hack aspect, i.e.
203// do it better, then remove.
204static bool
205always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
206{
207 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
208 return false;
209
210 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
211 return false;
212
213 if (pkt->flags & PF_COMMAND6)
214 {
215 data += 6;
216 len -= 6;
217 }
218
219 if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
220 if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
221 if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
222 if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
223 if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
224
225 if (len == 7 && !strcmp (data, "suicide")) return true;
226
227 return false;
220} 228}
221 229
222void 230void
223client::execute (const packet_type *pkt, char *data, int datalen) 231client::execute (const packet_type *pkt, char *data, int datalen)
224{ 232{
225 if (may_execute (pkt)) 233 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
226 { 234 {
227 //TODO: only one format 235 //TODO: only one format
228 if (pkt->flags & PF_PLAYER) 236 if (pkt->flags & PF_PLAYER)
229 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 237 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
230 else 238 else
231 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 239 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
232 } 240 }
233 else 241 else
234 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); 242 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
235} 243}
236 244
237bool 245bool
238client::handle_packet () 246client::handle_packet ()
239{ 247{
… …
271 } 279 }
272 280
273 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) 281 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
274 if (!strcmp ((char *)inbuf + 2, pkt->name)) 282 if (!strcmp ((char *)inbuf + 2, pkt->name))
275 { 283 {
276 if (pkt->flags & PF_IMMEDIATE) 284 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
285 queue_command (pkt, data, datalen);
286 else
277 execute (pkt, data, datalen); 287 execute (pkt, data, datalen);
278 else
279 queue_command (pkt, data, datalen);
280 288
281 goto next_packet; 289 goto next_packet;
282 } 290 }
283 291
284 /* If we get here, we didn't find a valid command. Logging 292 // If we get here, we didn't find a valid command.
285 * this might be questionable, because a broken client/malicious
286 * user could certainly send a whole bunch of invalid commands.
287 */
288 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); 293 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
289next_packet: 294next_packet:
290 skip_packet (pkt_len); 295 skip_packet (pkt_len);
291 296
292 // input buffer has space again 297 // input buffer has space again
293 socket_ev.poll (socket_ev.poll () | PE_R); 298 socket_ev.poll (socket_ev.poll () | EV_READ);
294 299
295 return true; 300 return true;
296} 301}
297 302
298// callback called when socket is either readable or writable 303// callback called when socket is either readable or writable
299void 304void
300client::socket_cb (iow &w, int got) 305client::socket_cb (iow &w, int revents)
301{ 306{
302 //TODO remove when we have better socket cleanup logic 307 //TODO remove when we have better socket cleanup logic
303 if (status == Ns_Dead) 308 if (destroyed ())
304 { 309 {
305 socket_ev.poll (0); 310 socket_ev.poll (0);
306 return; 311 return;
307 } 312 }
308 313
309 if (got & PE_W) 314 if (revents & EV_WRITE)
310 { 315 {
311 write_outputbuffer (); 316 write_outputbuffer ();
312 317
313 if (!outputbuffer.len) 318 if (!outputbuffer.len)
314 socket_ev.poll (socket_ev.poll () & ~PE_W); 319 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
315 } 320 }
316 321
317 if (got & PE_R) 322 if (revents & EV_READ)
318 { 323 {
319 //TODO: rate-limit tcp connection in better ways, important 324 //TODO: rate-limit tcp connection in better ways, important
320 325
321 int amount = sizeof (inbuf) - inbuf_len; 326 int amount = sizeof (inbuf) - inbuf_len;
322 327
323 if (!amount) 328 if (!amount)
324 { 329 {
325 // input buffer full 330 // input buffer full
326 socket_ev.poll (socket_ev.poll () & ~PE_R); 331 socket_ev.poll (socket_ev.poll () & ~EV_READ);
327 return; 332 return;
328 } 333 }
329 334
330 amount = read (fd, inbuf + inbuf_len, amount); 335 amount = read (fd, inbuf + inbuf_len, amount);
331 336
… …
347 } 352 }
348 else 353 else
349 { 354 {
350 inbuf_len += amount; 355 inbuf_len += amount;
351 356
352 cst_tot.ibytes += amount; 357 if (handle_packet ())
353 cst_lst.ibytes += amount; 358 {
359 while (handle_packet ())
360 ;
354 361
355 cmd_ev.start (); 362 flush ();
356 } 363 }
364 }
357 } 365 }
358}
359
360// called whenever we have additional commands to process
361void
362client::cmd_cb (iw &w)
363{
364 if (handle_packet () || handle_command ())
365 w.start ();
366 else
367 flush ();
368} 366}
369 367
370/******************************************************************************* 368/*******************************************************************************
371 * 369 *
372 * Start of write related routines. 370 * Start of write related routines.
… …
381 */ 379 */
382void 380void
383client::send (void *buf_, int len) 381client::send (void *buf_, int len)
384{ 382{
385 char *buf = (char *)buf_; 383 char *buf = (char *)buf_;
386 char *pos = buf;
387 int amt = 0;
388 384
389 if (status == Ns_Dead || !buf) 385 if (destroyed () || !buf)
390 return; 386 return;
391 387
392 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 388 if (len + outputbuffer.len > SOCKETBUFSIZE)
393 { 389 {
394 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); 390 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
395 destroy (); 391 // shutdown the socket, this is safer than destroying it immediately
392 // as lots of code in the callchain might still access the map etc.
393 shutdown (fd, SHUT_RDWR);
396 return; 394 return;
397 } 395 }
398 396
399 int avail, end; 397 int avail, end;
400 398
… …
425 * shortcut function. 423 * shortcut function.
426 */ 424 */
427void 425void
428client::send_packet (packet &sl) 426client::send_packet (packet &sl)
429{ 427{
430 if (status == Ns_Dead) 428 if (destroyed ())
431 return; 429 return;
432 430
433 if (sl.length () >= MAXSOCKBUF) 431 if (sl.length () > MAXSOCKBUF)
434 { 432 {
435 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 433 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
436 /* Almost certainly we've overflowed a buffer, so quit now to make 434 /* Almost certainly we've overflowed a buffer, so quit now to make
437 * it easier to debug. 435 * it easier to debug.
438 */ 436 */
… …
476 va_end (ap); 474 va_end (ap);
477 475
478 send_packet (sl); 476 send_packet (sl);
479} 477}
480 478
479void
480client::send_msg (int color, const char *type, const char *msg)
481{
482 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
483 {
484 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
485 return;
486 }
487
488 int len = strlen (msg);
489
490 if (!(color & NDI_VERBATIM)
491 && (msg_is_special (msg)
492 || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)))
493 cfperl_send_msg (this, color, type, msg);
494 else
495 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
496}
497
498void
499client::send_drawinfo (const char *msg, int flags)
500{
501 send_msg (flags, "log", msg);
502}
503
481/*********************************************************************** 504/***********************************************************************
482 * 505 *
483 * packet functions/utilities 506 * packet functions/utilities
484 * 507 *
485 **********************************************************************/ 508 **********************************************************************/
509
510packet::packet (const char *name)
511{
512 reset ();
513
514 int len = strlen (name);
515 memcpy (cur, name, len); cur += len;
516 *cur++ = ' ';
517}
518
519packet &packet::operator <<(const ber32 v)
520{
521 enum { maxlen = 32 / 7 + 1};
522 uint8 buf[maxlen];
523 uint8 *p = buf + maxlen;
524 uint32 val = v.val;
525
526 *--p = val & 0x7F;
527
528 while (val > 0x7F)
529 {
530 val >>= 7;
531 *--p = (val & 0x7F) | 0x80;
532 }
533
534 return *this << data (p, buf + maxlen - p);
535}
486 536
487packet &packet::operator <<(const data &v) 537packet &packet::operator <<(const data &v)
488{ 538{
489 if (room () < v.len) 539 if (room () < v.len)
490 reset (); 540 reset ();
… …
528 return reset (); 578 return reset ();
529 579
530 cur += len; 580 cur += len;
531} 581}
532 582
533/******************************************************************************
534 *
535 * statistics logging functions.
536 *
537 ******************************************************************************/
538
539#ifdef CS_LOGSTATS
540
541/* cst_tot is for the life of the server, cst_last is for the last series of
542 * stats
543 */
544CS_Stats cst_tot, cst_lst;
545
546/**
547 * Writes out the gathered stats. We clear cst_lst.
548 */
549void
550write_cs_stats (void)
551{
552 time_t now = time (NULL);
553
554 /* If no connections recently, don't both to log anything */
555 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
556 return;
557
558 /* CSSTAT is put in so scripts can easily find the line */
559 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
560 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
561 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
562 cst_lst.ibytes = 0;
563 cst_lst.obytes = 0;
564 cst_lst.time_start = now;
565}
566#endif
567

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