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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.31 by root, Mon Jan 15 02:39:41 2007 UTC vs.
Revision 1.72 by root, Tue Oct 13 18:20:08 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 (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team 4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra 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 * Deliantra is free software: you can redistribute it and/or modify it under
8 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
9 the Free Software Foundation; either version 2 of the License, or 9 * Free Software Foundation, either version 3 of the License, or (at your
10 (at your option) any later version. 10 * 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 Affero GNU General Public License
18 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
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 * <http://www.gnu.org/licenses/>.
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 <support@deliantra.net>
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// 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 * 1000 39#define IDLE_PING 2.
52#define SOCKET_TIMEOUT2 20 * 1000
53 40
54void 41void
55client::flush () 42client::flush ()
56{ 43{
57 if (destroyed ()) 44 if (destroyed ())
58 return; 45 return;
59
60#ifdef __linux__
61 // check time of last ack, and, if too old, kill connection
62 struct tcp_info tcpi;
63 socklen_t len = sizeof (tcpi);
64
65 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
66 {
67 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
68
69 rtt = tcpi.tcpi_rtt;
70 rttvar = tcpi.tcpi_rttvar;
71
72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s
73 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
74 {
75 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);
77 destroy ();
78 }
79 }
80#endif
81 46
82 /** 47 /**
83 * Writes data to socket. 48 * Writes data to socket.
84 * 49 *
85 * 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
86 * is called to write it out. 51 * is called to write it out.
87 */ 52 */
88 53
89 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)
90 return; 69 return;
91 70
71 last_send = NOW;
92 write_outputbuffer (); 72 write_outputbuffer ();
93} 73}
94 74
95void 75void
96client::write_outputbuffer () 76client::write_outputbuffer ()
… …
106 /* wrap back to start of buffer */ 86 /* wrap back to start of buffer */
107 if (outputbuffer.start == SOCKETBUFSIZE) 87 if (outputbuffer.start == SOCKETBUFSIZE)
108 outputbuffer.start = 0; 88 outputbuffer.start = 0;
109 89
110 outputbuffer.len -= res; 90 outputbuffer.len -= res;
111#ifdef CS_LOGSTATS
112 cst_tot.obytes += res;
113 cst_lst.obytes += res;
114#endif
115 } 91 }
116 else if (res == 0) 92 else if (res == 0)
117 { 93 {
118 LOG (llevError, "socket write failed, connection closed.\n"); 94 LOG (llevError, "socket write failed, connection closed.\n");
119 destroy (); 95 destroy ();
… …
124 // just retry 100 // just retry
125 } 101 }
126 else if (errno == EAGAIN) 102 else if (errno == EAGAIN)
127 { 103 {
128 // delay till ready 104 // delay till ready
129 socket_ev.poll (socket_ev.poll () | PE_W); 105 socket_ev.poll (socket_ev.poll () | EV_WRITE);
130 socket_ev.start (); 106 socket_ev.start ();
131 return; 107 return;
132 } 108 }
133 else 109 else
134 { 110 {
… …
136 destroy (); 112 destroy ();
137 return; 113 return;
138 } 114 }
139 } 115 }
140 116
141 socket_ev.poll (socket_ev.poll () & ~PE_W); 117 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
142} 118}
143 119
144/****************************************************************************** 120/******************************************************************************
145 * 121 *
146 * Start of read routines. 122 * Start of read routines.
… …
157 if (inbuf_len >= 2 + pkt_len) 133 if (inbuf_len >= 2 + pkt_len)
158 return 2 + pkt_len; 134 return 2 + pkt_len;
159 135
160 if (inbuf_len == sizeof (inbuf)) 136 if (inbuf_len == sizeof (inbuf))
161 { 137 {
162 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);
163 destroy (); 139 destroy ();
164 return -1; 140 return -1;
165 } 141 }
166 } 142 }
167 143
… …
186 162
187/** 163/**
188 * Dispatch table for the server. 164 * Dispatch table for the server.
189 */ 165 */
190static struct packet_type packets[] = { 166static struct packet_type packets[] = {
191 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 167 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
192 {"command", PC(PlayerCmd) PF_PLAYING }, 168 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
193 169
194 {"examine", PC(ExamineCmd) PF_PLAYING }, 170 {"examine", PC(ExamineCmd) PF_PLAYING },
171 {"ex", PC(ExCmd) PF_PLAYING },
195 {"apply", PC(ApplyCmd) PF_PLAYING }, 172 {"apply", PC(ApplyCmd) PF_PLAYING },
196 {"lookat", PC(LookAt) PF_PLAYING }, 173 {"lookat", PC(LookAt) PF_PLAYING },
197 {"lock", PC(LockItem) PF_PLAYING }, 174 {"lock", PC(LockItem) PF_PLAYING },
198 {"mark", PC(MarkItem) PF_PLAYING }, 175 {"mark", PC(MarkItem) PF_PLAYING },
199 {"move", PC(MoveCmd) PF_PLAYING }, 176 {"move", PC(MoveCmd) PF_PLAYING },
200 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 177 {"ext", PC(ExtCmd) 0 }, // CF+
201 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 178 {"mapredraw", PC(MapRedrawCmd) 0 },
202 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 179 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
203 180
204 {"reply", SC(ReplyCmd) 0 }, 181 {"reply", SC(ReplyCmd) 0 },
205 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 182 {"exti", SC(ExtiCmd) 0 }, // CF+
206 {"addme", SC(AddMeCmd) 0 }, 183 {"addme", SC(AddMeCmd) 0 },
207 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ 184 {"askface", SC(AskFaceCmd) 0 },
208 {"requestinfo", SC(RequestInfo) 0 }, 185 {"requestinfo", SC(RequestInfo) 0 },
209 {"setfacemode", SC(SetFaceMode) 0 },
210 {"setsound", SC(SetSound) 0 }, 186 {"setsound", SC(SetSound) 0 },
211 {"setup", SC(SetUp) 0 }, 187 {"setup", SC(SetUp) 0 },
212 {"version", SC(VersionCmd) 0 }, 188 {"version", SC(VersionCmd) 0 },
213 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
214 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */ 189 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
215 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
216}; 190};
217 191
218bool 192bool
219client::may_execute (const packet_type *pkt) const 193client::may_execute (const packet_type *pkt) const
220{ 194{
221 return (!(pkt->flags & PF_PLAYER) || pl) 195 return (!(pkt->flags & PF_PLAYER) || pl)
222 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); 196 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
223} 197}
224 198
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;
228}
229
225void 230void
226client::execute (const packet_type *pkt, char *data, int datalen) 231client::execute (const packet_type *pkt, char *data, int datalen)
227{ 232{
228 if (may_execute (pkt)) 233 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
229 { 234 {
230 //TODO: only one format 235 //TODO: only one format
231 if (pkt->flags & PF_PLAYER) 236 if (pkt->flags & PF_PLAYER)
232 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 237 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
233 else 238 else
234 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 239 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
235 } 240 }
236 else 241 else
237 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);
238} 243}
239 244
240bool 245bool
241client::handle_packet () 246client::handle_packet ()
242{ 247{
… …
250 pl && pl->ob ? &pl->ob->name : "[anonymous]"); 255 pl && pl->ob ? &pl->ob->name : "[anonymous]");
251 destroy (); 256 destroy ();
252 return false; 257 return false;
253 } 258 }
254 259
260 uint8_t save_byte = inbuf [pkt_len]; // rather ugly
255 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */ 261 inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
256 262
257 /* First, break out beginning word. There are at least 263 /* First, break out beginning word. There are at least
258 * a few commands that do not have any paremeters. If 264 * a few commands that do not have any paremeters. If
259 * we get such a command, don't worry about trying 265 * we get such a command, don't worry about trying
260 * to break it up. 266 * to break it up.
… …
274 } 280 }
275 281
276 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) 282 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
277 if (!strcmp ((char *)inbuf + 2, pkt->name)) 283 if (!strcmp ((char *)inbuf + 2, pkt->name))
278 { 284 {
279 if (pkt->flags & PF_PLAYER) 285 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
280 queue_command (pkt, data, datalen); 286 queue_command (pkt, data, datalen);
281 else 287 else
282 execute (pkt, data, datalen); 288 execute (pkt, data, datalen);
283 289
284 goto next_packet; 290 goto next_packet;
285 } 291 }
286 292
287 // If we get here, we didn't find a valid command. 293 // 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); 294 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
295
289next_packet: 296next_packet:
297 inbuf [pkt_len] = save_byte; // rather ugly
290 skip_packet (pkt_len); 298 skip_packet (pkt_len);
291 299
292 // input buffer has space again 300 // input buffer has space again
293 socket_ev.poll (socket_ev.poll () | PE_R); 301 socket_ev.poll (socket_ev.poll () | EV_READ);
294 302
295 return true; 303 return true;
296} 304}
297 305
298// callback called when socket is either readable or writable 306// callback called when socket is either readable or writable
299void 307void
300client::socket_cb (iow &w, int got) 308client::socket_cb (iow &w, int revents)
301{ 309{
302 //TODO remove when we have better socket cleanup logic 310 //TODO remove when we have better socket cleanup logic
303 if (destroyed ()) 311 if (destroyed ())
304 { 312 {
305 socket_ev.poll (0); 313 socket_ev.poll (0);
306 return; 314 return;
307 } 315 }
308 316
309 if (got & PE_W) 317 if (revents & EV_WRITE)
310 { 318 {
311 write_outputbuffer (); 319 write_outputbuffer ();
312 320
313 if (!outputbuffer.len) 321 if (!outputbuffer.len)
314 socket_ev.poll (socket_ev.poll () & ~PE_W); 322 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
315 } 323 }
316 324
317 if (got & PE_R) 325 if (revents & EV_READ)
318 { 326 {
319 //TODO: rate-limit tcp connection in better ways, important 327 //TODO: rate-limit tcp connection in better ways, important
320 328
321 int amount = sizeof (inbuf) - inbuf_len; 329 int amount = sizeof (inbuf) - inbuf_len;
322 330
323 if (!amount) 331 if (!amount)
324 { 332 {
325 // input buffer full 333 // input buffer full
326 socket_ev.poll (socket_ev.poll () & ~PE_R); 334 socket_ev.poll (socket_ev.poll () & ~EV_READ);
327 return; 335 return;
328 } 336 }
329 337
330 amount = read (fd, inbuf + inbuf_len, amount); 338 amount = read (fd, inbuf + inbuf_len, amount);
331 339
… …
347 } 355 }
348 else 356 else
349 { 357 {
350 inbuf_len += amount; 358 inbuf_len += amount;
351 359
352 cst_tot.ibytes += amount;
353 cst_lst.ibytes += amount;
354
355 cmd_ev.start ();
356 }
357 }
358}
359
360// called whenever we have additional commands to process
361void
362client::cmd_cb (iw &w)
363{
364 if (handle_packet ()) 360 if (handle_packet ())
365 w.start (); 361 {
366 else 362 while (handle_packet ())
367 flush (); 363 ;
364
365 flush ();
366 }
367 }
368 }
368} 369}
369 370
370/******************************************************************************* 371/*******************************************************************************
371 * 372 *
372 * Start of write related routines. 373 * Start of write related routines.
… …
381 */ 382 */
382void 383void
383client::send (void *buf_, int len) 384client::send (void *buf_, int len)
384{ 385{
385 char *buf = (char *)buf_; 386 char *buf = (char *)buf_;
386 char *pos = buf;
387 int amt = 0;
388 387
389 if (destroyed () || !buf) 388 if (destroyed () || !buf)
390 return; 389 return;
391 390
392 if (len + outputbuffer.len > SOCKETBUFSIZE) 391 if (len + outputbuffer.len > SOCKETBUFSIZE)
393 { 392 {
394 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); 393 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
395 destroy (); 394 // shutdown the socket, this is safer than destroying it immediately
395 // as lots of code in the callchain might still access the map etc.
396 shutdown (fd, SHUT_RDWR);
396 return; 397 return;
397 } 398 }
398 399
399 int avail, end; 400 int avail, end;
400 401
… …
428client::send_packet (packet &sl) 429client::send_packet (packet &sl)
429{ 430{
430 if (destroyed ()) 431 if (destroyed ())
431 return; 432 return;
432 433
433 if (sl.length () >= MAXSOCKBUF) 434 if (sl.length () > MAXSOCKBUF)
434 { 435 {
435 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 436 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 437 /* Almost certainly we've overflowed a buffer, so quit now to make
437 * it easier to debug. 438 * it easier to debug.
438 */ 439 */
… …
476 va_end (ap); 477 va_end (ap);
477 478
478 send_packet (sl); 479 send_packet (sl);
479} 480}
480 481
482void
483client::send_msg (int color, const char *type, const char *msg)
484{
485 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
486 {
487 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
488 return;
489 }
490
491 int len = strlen (msg);
492
493 if (!(color & NDI_VERBATIM)
494 && (msg_is_special (msg)
495 || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)))
496 cfperl_send_msg (this, color, type, msg);
497 else
498 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
499}
500
501void
502client::send_drawinfo (const char *msg, int flags)
503{
504 send_msg (flags, "log", msg);
505}
506
481/*********************************************************************** 507/***********************************************************************
482 * 508 *
483 * packet functions/utilities 509 * packet functions/utilities
484 * 510 *
485 **********************************************************************/ 511 **********************************************************************/
… …
491 int len = strlen (name); 517 int len = strlen (name);
492 memcpy (cur, name, len); cur += len; 518 memcpy (cur, name, len); cur += len;
493 *cur++ = ' '; 519 *cur++ = ' ';
494} 520}
495 521
522packet &packet::operator <<(const ber32 v)
523{
524 enum { maxlen = 32 / 7 + 1};
525 uint8 buf[maxlen];
526 uint8 *p = buf + maxlen;
527 uint32 val = v.val;
528
529 *--p = val & 0x7F;
530
531 while (val > 0x7F)
532 {
533 val >>= 7;
534 *--p = (val & 0x7F) | 0x80;
535 }
536
537 return *this << data (p, buf + maxlen - p);
538}
539
496packet &packet::operator <<(const data &v) 540packet &packet::operator <<(const data &v)
497{ 541{
498 if (room () < v.len) 542 if (room () < v.len)
499 reset (); 543 reset ();
500 else 544 else
… …
537 return reset (); 581 return reset ();
538 582
539 cur += len; 583 cur += len;
540} 584}
541 585
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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