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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.42 by root, Mon May 28 21:22:26 2007 UTC vs.
Revision 1.72 by root, Tue Oct 13 18:20:08 2009 UTC

1/* 1/*
2 * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game. 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 * 3 *
4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team 4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 * Copyright (©) 1992,2007 Frank Tore Johansen 5 * Copyright (©) 1992,2007 Frank Tore Johansen
6 * 6 *
7 * Crossfire TRT is free software; you can redistribute it and/or modify it 7 * Deliantra is free software: you can redistribute it and/or modify it under
8 * under the terms of the GNU General Public License as published by the Free 8 * the terms of the Affero GNU General Public License as published by the
9 * Software Foundation; either version 2 of the License, or (at your option) 9 * Free Software Foundation, either version 3 of the License, or (at your
10 * any later version. 10 * option) any later version.
11 * 11 *
12 * This program is distributed in the hope that it will be useful, but 12 * This program is distributed in the hope that it will be useful,
13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * 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 along 17 * You should have received a copy of the Affero GNU General Public License
18 * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51 18 * and the GNU General Public License along with this program. If not, see
19 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 * <http://www.gnu.org/licenses/>.
20 * 20 *
21 * The authors can be reached via e-mail to <crossfire@schmorp.de> 21 * The authors can be reached via e-mail to <support@deliantra.net>
22 */
23
24/**
25 * \file
26 * Low-level socket-related functions.
27 *
28 * \date 2003-12-02
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
… …
205 {"reply", SC(ReplyCmd) 0 }, 181 {"reply", SC(ReplyCmd) 0 },
206 {"exti", SC(ExtiCmd) 0 }, // CF+ 182 {"exti", SC(ExtiCmd) 0 }, // CF+
207 {"addme", SC(AddMeCmd) 0 }, 183 {"addme", SC(AddMeCmd) 0 },
208 {"askface", SC(AskFaceCmd) 0 }, 184 {"askface", SC(AskFaceCmd) 0 },
209 {"requestinfo", SC(RequestInfo) 0 }, 185 {"requestinfo", SC(RequestInfo) 0 },
210 {"setfacemode", SC(SetFaceMode) 0 },
211 {"setsound", SC(SetSound) 0 }, 186 {"setsound", SC(SetSound) 0 },
212 {"setup", SC(SetUp) 0 }, 187 {"setup", SC(SetUp) 0 },
213 {"version", SC(VersionCmd) 0 }, 188 {"version", SC(VersionCmd) 0 },
214 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
215 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */ 189 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
216 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
217}; 190};
218 191
219bool 192bool
220client::may_execute (const packet_type *pkt) const 193client::may_execute (const packet_type *pkt) const
221{ 194{
… …
241 { 214 {
242 data += 6; 215 data += 6;
243 len -= 6; 216 len -= 6;
244 } 217 }
245 218
246 if (len > 4 && !strncmp (data, "say " , 4)) 219 if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
247 return true; 220 if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
248 if (len > 5 && !strncmp (data, "chat ", 5)) 221 if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
249 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;
250 226
251 return false; 227 return false;
252} 228}
253 229
254void 230void
… …
261 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 237 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
262 else 238 else
263 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 239 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
264 } 240 }
265 else 241 else
266 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);
267} 243}
268 244
269bool 245bool
270client::handle_packet () 246client::handle_packet ()
271{ 247{
… …
279 pl && pl->ob ? &pl->ob->name : "[anonymous]"); 255 pl && pl->ob ? &pl->ob->name : "[anonymous]");
280 destroy (); 256 destroy ();
281 return false; 257 return false;
282 } 258 }
283 259
260 uint8_t save_byte = inbuf [pkt_len]; // rather ugly
284 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */ 261 inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
285 262
286 /* First, break out beginning word. There are at least 263 /* First, break out beginning word. There are at least
287 * a few commands that do not have any paremeters. If 264 * a few commands that do not have any paremeters. If
288 * we get such a command, don't worry about trying 265 * we get such a command, don't worry about trying
289 * to break it up. 266 * to break it up.
… …
312 289
313 goto next_packet; 290 goto next_packet;
314 } 291 }
315 292
316 // If we get here, we didn't find a valid command. 293 // If we get here, we didn't find a valid command.
317 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
318next_packet: 296next_packet:
297 inbuf [pkt_len] = save_byte; // rather ugly
319 skip_packet (pkt_len); 298 skip_packet (pkt_len);
320 299
321 // input buffer has space again 300 // input buffer has space again
322 socket_ev.poll (socket_ev.poll () | PE_R); 301 socket_ev.poll (socket_ev.poll () | EV_READ);
323 302
324 return true; 303 return true;
325} 304}
326 305
327// callback called when socket is either readable or writable 306// callback called when socket is either readable or writable
328void 307void
329client::socket_cb (iow &w, int got) 308client::socket_cb (iow &w, int revents)
330{ 309{
331 //TODO remove when we have better socket cleanup logic 310 //TODO remove when we have better socket cleanup logic
332 if (destroyed ()) 311 if (destroyed ())
333 { 312 {
334 socket_ev.poll (0); 313 socket_ev.poll (0);
335 return; 314 return;
336 } 315 }
337 316
338 if (got & PE_W) 317 if (revents & EV_WRITE)
339 { 318 {
340 write_outputbuffer (); 319 write_outputbuffer ();
341 320
342 if (!outputbuffer.len) 321 if (!outputbuffer.len)
343 socket_ev.poll (socket_ev.poll () & ~PE_W); 322 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
344 } 323 }
345 324
346 if (got & PE_R) 325 if (revents & EV_READ)
347 { 326 {
348 //TODO: rate-limit tcp connection in better ways, important 327 //TODO: rate-limit tcp connection in better ways, important
349 328
350 int amount = sizeof (inbuf) - inbuf_len; 329 int amount = sizeof (inbuf) - inbuf_len;
351 330
352 if (!amount) 331 if (!amount)
353 { 332 {
354 // input buffer full 333 // input buffer full
355 socket_ev.poll (socket_ev.poll () & ~PE_R); 334 socket_ev.poll (socket_ev.poll () & ~EV_READ);
356 return; 335 return;
357 } 336 }
358 337
359 amount = read (fd, inbuf + inbuf_len, amount); 338 amount = read (fd, inbuf + inbuf_len, amount);
360 339
… …
376 } 355 }
377 else 356 else
378 { 357 {
379 inbuf_len += amount; 358 inbuf_len += amount;
380 359
381 cst_tot.ibytes += amount;
382 cst_lst.ibytes += amount;
383
384 cmd_ev.start ();
385 }
386 }
387}
388
389// called whenever we have additional commands to process
390void
391client::cmd_cb (iw &w)
392{
393 if (handle_packet ()) 360 if (handle_packet ())
394 w.start (); 361 {
395 else 362 while (handle_packet ())
396 flush (); 363 ;
364
365 flush ();
366 }
367 }
368 }
397} 369}
398 370
399/******************************************************************************* 371/*******************************************************************************
400 * 372 *
401 * Start of write related routines. 373 * Start of write related routines.
… …
457client::send_packet (packet &sl) 429client::send_packet (packet &sl)
458{ 430{
459 if (destroyed ()) 431 if (destroyed ())
460 return; 432 return;
461 433
462 if (sl.length () >= MAXSOCKBUF) 434 if (sl.length () > MAXSOCKBUF)
463 { 435 {
464 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 ());
465 /* 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
466 * it easier to debug. 438 * it easier to debug.
467 */ 439 */
… …
506 478
507 send_packet (sl); 479 send_packet (sl);
508} 480}
509 481
510void 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
511client::send_drawinfo (const char *msg, int flags) 502client::send_drawinfo (const char *msg, int flags)
512{ 503{
513 send_packet_printf ("drawinfo %d %s", flags, msg); 504 send_msg (flags, "log", msg);
514}
515
516void
517client::send_msg (int color, const char *type, const char *msg)
518{
519 if (can_msg)
520 send_packet_printf ("msg %d %s %s", color, type, msg);
521 else if (color < 0)
522 return; // client cannot handle this
523 else if (strchr (msg, '<') || strchr (msg, '&'))
524 {
525 //TODO: should escape/modify to old syntax
526 send_packet_printf ("drawinfo %d %s", color, msg);
527 }
528 else
529 send_packet_printf ("drawinfo %d %s", color, msg);
530} 505}
531 506
532/*********************************************************************** 507/***********************************************************************
533 * 508 *
534 * packet functions/utilities 509 * packet functions/utilities
… …
606 return reset (); 581 return reset ();
607 582
608 cur += len; 583 cur += len;
609} 584}
610 585
611/******************************************************************************
612 *
613 * statistics logging functions.
614 *
615 ******************************************************************************/
616
617#ifdef CS_LOGSTATS
618
619/* cst_tot is for the life of the server, cst_last is for the last series of
620 * stats
621 */
622CS_Stats cst_tot, cst_lst;
623
624/**
625 * Writes out the gathered stats. We clear cst_lst.
626 */
627void
628write_cs_stats (void)
629{
630 time_t now = time (NULL);
631
632 /* If no connections recently, don't both to log anything */
633 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
634 return;
635
636 /* CSSTAT is put in so scripts can easily find the line */
637 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
638 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
639 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
640 cst_lst.ibytes = 0;
641 cst_lst.obytes = 0;
642 cst_lst.time_start = now;
643}
644#endif
645

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