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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.29 by root, Thu Dec 21 23:37:06 2006 UTC vs.
Revision 1.70 by root, Sat Feb 21 06:25:46 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
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 <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 */ 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// force a packet when idle for more than this many seconds,
49// easily die in 20 seconds... 37// forcing an ack regularly.
50#define SOCKET_TIMEOUT1 10 * 1000 38#define IDLE_PING 2.
51#define SOCKET_TIMEOUT2 20 * 1000
52 39
53void 40void
54client::flush () 41client::flush ()
55{ 42{
56 if (destroyed ()) 43 if (destroyed ())
57 return; 44 return;
58
59#ifdef __linux__
60 // check time of last ack, and, if too old, kill connection
61 struct tcp_info tcpi;
62 socklen_t len = sizeof (tcpi);
63
64 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
65 {
66 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
67
68 rtt = tcpi.tcpi_rtt;
69 rttvar = tcpi.tcpi_rttvar;
70
71 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s
72 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
73 {
74 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
75 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
76 destroy ();
77 }
78 }
79#endif
80 45
81 /** 46 /**
82 * Writes data to socket. 47 * Writes data to socket.
83 * 48 *
84 * When the socket is clear to write, and we have backlogged data, this 49 * When the socket is clear to write, and we have backlogged data, this
85 * is called to write it out. 50 * is called to write it out.
86 */ 51 */
87 52
88 if (!outputbuffer.len || socket_ev.poll () & PE_W) 53 // write a nop to the socket at least every IDLE_NOP seconds.
54 if (!outputbuffer.len)
55 {
56 if (last_send + IDLE_PING <= NOW && pl && pl->active)
57 {
58 // this is a bit ugly, but map1/map1a seem to be the only
59 // nop'able commands and they are quite small.
60 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
61 send_packet (sl);
62 }
63 else
64 return;
65 }
66
67 if (socket_ev.poll () & EV_WRITE)
89 return; 68 return;
90 69
70 last_send = NOW;
91 write_outputbuffer (); 71 write_outputbuffer ();
92} 72}
93 73
94void 74void
95client::write_outputbuffer () 75client::write_outputbuffer ()
… …
105 /* wrap back to start of buffer */ 85 /* wrap back to start of buffer */
106 if (outputbuffer.start == SOCKETBUFSIZE) 86 if (outputbuffer.start == SOCKETBUFSIZE)
107 outputbuffer.start = 0; 87 outputbuffer.start = 0;
108 88
109 outputbuffer.len -= res; 89 outputbuffer.len -= res;
110#ifdef CS_LOGSTATS
111 cst_tot.obytes += res;
112 cst_lst.obytes += res;
113#endif
114 } 90 }
115 else if (res == 0) 91 else if (res == 0)
116 { 92 {
117 LOG (llevError, "socket write failed, connection closed.\n"); 93 LOG (llevError, "socket write failed, connection closed.\n");
118 destroy (); 94 destroy ();
… …
123 // just retry 99 // just retry
124 } 100 }
125 else if (errno == EAGAIN) 101 else if (errno == EAGAIN)
126 { 102 {
127 // delay till ready 103 // delay till ready
128 socket_ev.poll (socket_ev.poll () | PE_W); 104 socket_ev.poll (socket_ev.poll () | EV_WRITE);
129 socket_ev.start (); 105 socket_ev.start ();
130 return; 106 return;
131 } 107 }
132 else 108 else
133 { 109 {
… …
135 destroy (); 111 destroy ();
136 return; 112 return;
137 } 113 }
138 } 114 }
139 115
140 socket_ev.poll (socket_ev.poll () & ~PE_W); 116 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
141} 117}
142 118
143/****************************************************************************** 119/******************************************************************************
144 * 120 *
145 * Start of read routines. 121 * Start of read routines.
… …
156 if (inbuf_len >= 2 + pkt_len) 132 if (inbuf_len >= 2 + pkt_len)
157 return 2 + pkt_len; 133 return 2 + pkt_len;
158 134
159 if (inbuf_len == sizeof (inbuf)) 135 if (inbuf_len == sizeof (inbuf))
160 { 136 {
161 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED); 137 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY);
162 destroy (); 138 destroy ();
163 return -1; 139 return -1;
164 } 140 }
165 } 141 }
166 142
… …
185 161
186/** 162/**
187 * Dispatch table for the server. 163 * Dispatch table for the server.
188 */ 164 */
189static struct packet_type packets[] = { 165static struct packet_type packets[] = {
190 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 166 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
191 {"command", PC(PlayerCmd) PF_PLAYING }, 167 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
192 168
193 {"examine", PC(ExamineCmd) PF_PLAYING }, 169 {"examine", PC(ExamineCmd) PF_PLAYING },
170 {"ex", PC(ExCmd) PF_PLAYING },
194 {"apply", PC(ApplyCmd) PF_PLAYING }, 171 {"apply", PC(ApplyCmd) PF_PLAYING },
195 {"lookat", PC(LookAt) PF_PLAYING }, 172 {"lookat", PC(LookAt) PF_PLAYING },
196 {"lock", PC(LockItem) PF_PLAYING }, 173 {"lock", PC(LockItem) PF_PLAYING },
197 {"mark", PC(MarkItem) PF_PLAYING }, 174 {"mark", PC(MarkItem) PF_PLAYING },
198 {"move", PC(MoveCmd) PF_PLAYING }, 175 {"move", PC(MoveCmd) PF_PLAYING },
199 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 176 {"ext", PC(ExtCmd) 0 }, // CF+
200 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ 177 {"mapredraw", PC(MapRedrawCmd) 0 },
201 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 178 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
202 179
203 {"reply", SC(ReplyCmd) 0 }, 180 {"reply", SC(ReplyCmd) 0 },
204 {"exti", SC(ExtiCmd) 0 }, /* CF+ */ 181 {"exti", SC(ExtiCmd) 0 }, // CF+
205 {"addme", SC(AddMeCmd) 0 }, 182 {"addme", SC(AddMeCmd) 0 },
206 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ 183 {"askface", SC(AskFaceCmd) 0 },
207 {"requestinfo", SC(RequestInfo) 0 }, 184 {"requestinfo", SC(RequestInfo) 0 },
208 {"setfacemode", SC(SetFaceMode) 0 },
209 {"setsound", SC(SetSound) 0 }, 185 {"setsound", SC(SetSound) 0 },
210 {"setup", SC(SetUp) 0 }, 186 {"setup", SC(SetUp) 0 },
211 {"version", SC(VersionCmd) 0 }, 187 {"version", SC(VersionCmd) 0 },
212 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
213 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */ 188 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
214 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
215}; 189};
216 190
217bool 191bool
218client::may_execute (const packet_type *pkt) const 192client::may_execute (const packet_type *pkt) const
219{ 193{
220 return (!(pkt->flags & PF_PLAYER) || pl) 194 return (!(pkt->flags & PF_PLAYER) || pl)
221 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); 195 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
222} 196}
223 197
198// HACK: some commands currently should be executed
199// even when the player is frozen. this hack detects
200// those commands. it should be folded into may_execute,
201// but kept seperate to emphasise the hack aspect, i.e.
202// do it better, then remove.
203static bool
204always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
205{
206 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
207 return false;
208
209 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
210 return false;
211
212 if (pkt->flags & PF_COMMAND6)
213 {
214 data += 6;
215 len -= 6;
216 }
217
218 if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
219 if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
220 if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
221 if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
222 if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
223
224 if (len == 7 && !strcmp (data, "suicide")) return true;
225
226 return false;
227}
228
224void 229void
225client::execute (const packet_type *pkt, char *data, int datalen) 230client::execute (const packet_type *pkt, char *data, int datalen)
226{ 231{
227 if (may_execute (pkt)) 232 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
228 { 233 {
229 //TODO: only one format 234 //TODO: only one format
230 if (pkt->flags & PF_PLAYER) 235 if (pkt->flags & PF_PLAYER)
231 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 236 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
232 else 237 else
233 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 238 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
234 } 239 }
235 else 240 else
236 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); 241 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
237} 242}
238 243
239bool 244bool
240client::handle_packet () 245client::handle_packet ()
241{ 246{
… …
273 } 278 }
274 279
275 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) 280 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
276 if (!strcmp ((char *)inbuf + 2, pkt->name)) 281 if (!strcmp ((char *)inbuf + 2, pkt->name))
277 { 282 {
278 if (pkt->flags & PF_PLAYER) 283 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
279 queue_command (pkt, data, datalen); 284 queue_command (pkt, data, datalen);
280 else 285 else
281 execute (pkt, data, datalen); 286 execute (pkt, data, datalen);
282 287
283 goto next_packet; 288 goto next_packet;
284 } 289 }
285 290
286 // If we get here, we didn't find a valid command. 291 // If we get here, we didn't find a valid command.
287 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); 292 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
288next_packet: 293next_packet:
289 skip_packet (pkt_len); 294 skip_packet (pkt_len);
290 295
291 // input buffer has space again 296 // input buffer has space again
292 socket_ev.poll (socket_ev.poll () | PE_R); 297 socket_ev.poll (socket_ev.poll () | EV_READ);
293 298
294 return true; 299 return true;
295} 300}
296 301
297// callback called when socket is either readable or writable 302// callback called when socket is either readable or writable
298void 303void
299client::socket_cb (iow &w, int got) 304client::socket_cb (iow &w, int revents)
300{ 305{
301 //TODO remove when we have better socket cleanup logic 306 //TODO remove when we have better socket cleanup logic
302 if (destroyed ()) 307 if (destroyed ())
303 { 308 {
304 socket_ev.poll (0); 309 socket_ev.poll (0);
305 return; 310 return;
306 } 311 }
307 312
308 if (got & PE_W) 313 if (revents & EV_WRITE)
309 { 314 {
310 write_outputbuffer (); 315 write_outputbuffer ();
311 316
312 if (!outputbuffer.len) 317 if (!outputbuffer.len)
313 socket_ev.poll (socket_ev.poll () & ~PE_W); 318 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
314 } 319 }
315 320
316 if (got & PE_R) 321 if (revents & EV_READ)
317 { 322 {
318 //TODO: rate-limit tcp connection in better ways, important 323 //TODO: rate-limit tcp connection in better ways, important
319 324
320 int amount = sizeof (inbuf) - inbuf_len; 325 int amount = sizeof (inbuf) - inbuf_len;
321 326
322 if (!amount) 327 if (!amount)
323 { 328 {
324 // input buffer full 329 // input buffer full
325 socket_ev.poll (socket_ev.poll () & ~PE_R); 330 socket_ev.poll (socket_ev.poll () & ~EV_READ);
326 return; 331 return;
327 } 332 }
328 333
329 amount = read (fd, inbuf + inbuf_len, amount); 334 amount = read (fd, inbuf + inbuf_len, amount);
330 335
… …
346 } 351 }
347 else 352 else
348 { 353 {
349 inbuf_len += amount; 354 inbuf_len += amount;
350 355
351 cst_tot.ibytes += amount;
352 cst_lst.ibytes += amount;
353
354 cmd_ev.start ();
355 }
356 }
357}
358
359// called whenever we have additional commands to process
360void
361client::cmd_cb (iw &w)
362{
363 if (handle_packet ()) 356 if (handle_packet ())
364 w.start (); 357 {
365 else 358 while (handle_packet ())
366 flush (); 359 ;
360
361 flush ();
362 }
363 }
364 }
367} 365}
368 366
369/******************************************************************************* 367/*******************************************************************************
370 * 368 *
371 * Start of write related routines. 369 * Start of write related routines.
… …
380 */ 378 */
381void 379void
382client::send (void *buf_, int len) 380client::send (void *buf_, int len)
383{ 381{
384 char *buf = (char *)buf_; 382 char *buf = (char *)buf_;
385 char *pos = buf;
386 int amt = 0;
387 383
388 if (destroyed () || !buf) 384 if (destroyed () || !buf)
389 return; 385 return;
390 386
391 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 387 if (len + outputbuffer.len > SOCKETBUFSIZE)
392 { 388 {
393 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); 389 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
394 destroy (); 390 // shutdown the socket, this is safer than destroying it immediately
391 // as lots of code in the callchain might still access the map etc.
392 shutdown (fd, SHUT_RDWR);
395 return; 393 return;
396 } 394 }
397 395
398 int avail, end; 396 int avail, end;
399 397
… …
427client::send_packet (packet &sl) 425client::send_packet (packet &sl)
428{ 426{
429 if (destroyed ()) 427 if (destroyed ())
430 return; 428 return;
431 429
432 if (sl.length () >= MAXSOCKBUF) 430 if (sl.length () > MAXSOCKBUF)
433 { 431 {
434 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 432 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
435 /* Almost certainly we've overflowed a buffer, so quit now to make 433 /* Almost certainly we've overflowed a buffer, so quit now to make
436 * it easier to debug. 434 * it easier to debug.
437 */ 435 */
… …
475 va_end (ap); 473 va_end (ap);
476 474
477 send_packet (sl); 475 send_packet (sl);
478} 476}
479 477
478void
479client::send_msg (int color, const char *type, const char *msg)
480{
481 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
482 {
483 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
484 return;
485 }
486
487 int len = strlen (msg);
488
489 if (!(color & NDI_VERBATIM)
490 && (msg_is_special (msg)
491 || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)))
492 cfperl_send_msg (this, color, type, msg);
493 else
494 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
495}
496
497void
498client::send_drawinfo (const char *msg, int flags)
499{
500 send_msg (flags, "log", msg);
501}
502
480/*********************************************************************** 503/***********************************************************************
481 * 504 *
482 * packet functions/utilities 505 * packet functions/utilities
483 * 506 *
484 **********************************************************************/ 507 **********************************************************************/
… …
490 int len = strlen (name); 513 int len = strlen (name);
491 memcpy (cur, name, len); cur += len; 514 memcpy (cur, name, len); cur += len;
492 *cur++ = ' '; 515 *cur++ = ' ';
493} 516}
494 517
518packet &packet::operator <<(const ber32 v)
519{
520 enum { maxlen = 32 / 7 + 1};
521 uint8 buf[maxlen];
522 uint8 *p = buf + maxlen;
523 uint32 val = v.val;
524
525 *--p = val & 0x7F;
526
527 while (val > 0x7F)
528 {
529 val >>= 7;
530 *--p = (val & 0x7F) | 0x80;
531 }
532
533 return *this << data (p, buf + maxlen - p);
534}
535
495packet &packet::operator <<(const data &v) 536packet &packet::operator <<(const data &v)
496{ 537{
497 if (room () < v.len) 538 if (room () < v.len)
498 reset (); 539 reset ();
499 else 540 else
… …
536 return reset (); 577 return reset ();
537 578
538 cur += len; 579 cur += len;
539} 580}
540 581
541/******************************************************************************
542 *
543 * statistics logging functions.
544 *
545 ******************************************************************************/
546
547#ifdef CS_LOGSTATS
548
549/* cst_tot is for the life of the server, cst_last is for the last series of
550 * stats
551 */
552CS_Stats cst_tot, cst_lst;
553
554/**
555 * Writes out the gathered stats. We clear cst_lst.
556 */
557void
558write_cs_stats (void)
559{
560 time_t now = time (NULL);
561
562 /* If no connections recently, don't both to log anything */
563 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
564 return;
565
566 /* CSSTAT is put in so scripts can easily find the line */
567 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
568 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
569 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
570 cst_lst.ibytes = 0;
571 cst_lst.obytes = 0;
572 cst_lst.time_start = now;
573}
574#endif
575

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