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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.23 by root, Sat Dec 16 03:08:26 2006 UTC vs.
Revision 1.67 by root, Fri Dec 26 10:44:17 2008 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# define TCP_HZ 1000 // sorry...
46# include <netinet/tcp.h> 33# include <netinet/tcp.h>
47#endif 34#endif
48 35
49// 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,
50// easily die in 20 seconds... 37// forcing an ack regularly.
51#define SOCKET_TIMEOUT1 10 38#define IDLE_PING 2.
52#define SOCKET_TIMEOUT2 20
53 39
54void 40void
55client::flush () 41client::flush ()
56{ 42{
57#ifdef __linux__ 43 if (destroyed ())
58 // check time of last ack, and, if too old, kill connection 44 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 45
79 /** 46 /**
80 * Writes data to socket. 47 * Writes data to socket.
81 * 48 *
82 * 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
83 * is called to write it out. 50 * is called to write it out.
84 */ 51 */
85 52
86 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)
87 return; 68 return;
88 69
70 last_send = NOW;
89 write_outputbuffer (); 71 write_outputbuffer ();
90} 72}
91 73
92void 74void
93client::write_outputbuffer () 75client::write_outputbuffer ()
… …
103 /* wrap back to start of buffer */ 85 /* wrap back to start of buffer */
104 if (outputbuffer.start == SOCKETBUFSIZE) 86 if (outputbuffer.start == SOCKETBUFSIZE)
105 outputbuffer.start = 0; 87 outputbuffer.start = 0;
106 88
107 outputbuffer.len -= res; 89 outputbuffer.len -= res;
108#ifdef CS_LOGSTATS
109 cst_tot.obytes += res;
110 cst_lst.obytes += res;
111#endif
112 } 90 }
113 else if (res == 0) 91 else if (res == 0)
114 { 92 {
115 LOG (llevError, "socket write failed, connection closed.\n"); 93 LOG (llevError, "socket write failed, connection closed.\n");
116 destroy (); 94 destroy ();
… …
121 // just retry 99 // just retry
122 } 100 }
123 else if (errno == EAGAIN) 101 else if (errno == EAGAIN)
124 { 102 {
125 // delay till ready 103 // delay till ready
126 socket_ev.poll (socket_ev.poll () | PE_W); 104 socket_ev.poll (socket_ev.poll () | EV_WRITE);
127 socket_ev.start (); 105 socket_ev.start ();
128 return; 106 return;
129 } 107 }
130 else 108 else
131 { 109 {
… …
133 destroy (); 111 destroy ();
134 return; 112 return;
135 } 113 }
136 } 114 }
137 115
138 socket_ev.poll (socket_ev.poll () & ~PE_W); 116 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
139} 117}
140 118
141/****************************************************************************** 119/******************************************************************************
142 * 120 *
143 * Start of read routines. 121 * Start of read routines.
… …
154 if (inbuf_len >= 2 + pkt_len) 132 if (inbuf_len >= 2 + pkt_len)
155 return 2 + pkt_len; 133 return 2 + pkt_len;
156 134
157 if (inbuf_len == sizeof (inbuf)) 135 if (inbuf_len == sizeof (inbuf))
158 { 136 {
159 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);
160 destroy (); 138 destroy ();
161 return -1; 139 return -1;
162 } 140 }
163 } 141 }
164 142
… …
183 161
184/** 162/**
185 * Dispatch table for the server. 163 * Dispatch table for the server.
186 */ 164 */
187static struct packet_type packets[] = { 165static struct packet_type packets[] = {
188 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 166 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
189 {"command", PC(PlayerCmd) PF_PLAYING }, 167 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
190 168
191 {"examine", PC(ExamineCmd) PF_PLAYING }, 169 {"examine", PC(ExamineCmd) PF_PLAYING },
170 {"ex", PC(ExCmd) PF_PLAYING },
192 {"apply", PC(ApplyCmd) PF_PLAYING }, 171 {"apply", PC(ApplyCmd) PF_PLAYING },
193 {"reply", PC(ReplyCmd) PF_IMMEDIATE },
194 {"lookat", PC(LookAt) PF_PLAYING }, 172 {"lookat", PC(LookAt) PF_PLAYING },
195 {"lock", PC(LockItem) PF_PLAYING }, 173 {"lock", PC(LockItem) PF_PLAYING },
196 {"mark", PC(MarkItem) PF_PLAYING }, 174 {"mark", PC(MarkItem) PF_PLAYING },
197 {"move", PC(MoveCmd) PF_PLAYING }, 175 {"move", PC(MoveCmd) PF_PLAYING },
198 {"exti", PC(ExtCmd) PF_IMMEDIATE }, /* CF+ */
199 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 176 {"ext", PC(ExtCmd) 0 }, // CF+
200 {"mapredraw", PC(MapRedrawCmd) PF_IMMEDIATE }, /* Added: phil */ 177 {"mapredraw", PC(MapRedrawCmd) 0 },
201 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 178 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
202 179
180 {"reply", SC(ReplyCmd) 0 },
181 {"exti", SC(ExtiCmd) 0 }, // CF+
203 {"addme", SC(AddMeCmd) PF_IMMEDIATE }, 182 {"addme", SC(AddMeCmd) 0 },
204 {"askface", SC(SendFaceCmd) PF_IMMEDIATE }, /* Added: phil */ 183 {"askface", SC(AskFaceCmd) 0 },
205 {"requestinfo", SC(RequestInfo) PF_IMMEDIATE }, 184 {"requestinfo", SC(RequestInfo) 0 },
206 {"setfacemode", SC(SetFaceMode) PF_IMMEDIATE }, 185 {"setfacemode", SC(SetFaceMode) 0 },
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) */ 190 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
213}; 191};
214 192
215bool 193bool
216client::may_execute (const packet_type *pkt) const 194client::may_execute (const packet_type *pkt) const
217{ 195{
218 return (!(pkt->flags & PF_PLAYER) || pl) 196 return (!(pkt->flags & PF_PLAYER) || pl)
219 && (!(pkt->flags & PF_PLAYING) || (pl && pl->state == ST_PLAYING)); 197 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
198}
199
200// HACK: some commands currently should be executed
201// even when the player is frozen. this hack detects
202// those commands. it should be folded into may_execute,
203// but kept seperate to emphasise the hack aspect, i.e.
204// do it better, then remove.
205static bool
206always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
207{
208 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
209 return false;
210
211 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
212 return false;
213
214 if (pkt->flags & PF_COMMAND6)
215 {
216 data += 6;
217 len -= 6;
218 }
219
220 if (len > 4 && data [3] == ' ' && !strncmp (data, "say " , 4)) return true;
221 if (len > 5 && data [4] == ' ' && !strncmp (data, "chat " , 5)) return true;
222 if (len > 6 && data [5] == ' ' && !strncmp (data, "shout ", 6)) return true;
223
224 if (len == 7 && !strcmp (data, "suicide")) return true;
225
226 return false;
220} 227}
221 228
222void 229void
223client::execute (const packet_type *pkt, char *data, int datalen) 230client::execute (const packet_type *pkt, char *data, int datalen)
224{ 231{
225 if (may_execute (pkt)) 232 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
226 { 233 {
227 //TODO: only one format 234 //TODO: only one format
228 if (pkt->flags & PF_PLAYER) 235 if (pkt->flags & PF_PLAYER)
229 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 236 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
230 else 237 else
231 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 238 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
232 } 239 }
233 else 240 else
234 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);
235} 242}
236 243
237bool 244bool
238client::handle_packet () 245client::handle_packet ()
239{ 246{
… …
271 } 278 }
272 279
273 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)
274 if (!strcmp ((char *)inbuf + 2, pkt->name)) 281 if (!strcmp ((char *)inbuf + 2, pkt->name))
275 { 282 {
276 if (pkt->flags & PF_IMMEDIATE) 283 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
284 queue_command (pkt, data, datalen);
285 else
277 execute (pkt, data, datalen); 286 execute (pkt, data, datalen);
278 else
279 queue_command (pkt, data, datalen);
280 287
281 goto next_packet; 288 goto next_packet;
282 } 289 }
283 290
284 /* If we get here, we didn't find a valid command. Logging 291 // 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); 292 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
289next_packet: 293next_packet:
290 skip_packet (pkt_len); 294 skip_packet (pkt_len);
291 295
292 // input buffer has space again 296 // input buffer has space again
293 socket_ev.poll (socket_ev.poll () | PE_R); 297 socket_ev.poll (socket_ev.poll () | EV_READ);
294 298
295 return true; 299 return true;
296} 300}
297 301
298// callback called when socket is either readable or writable 302// callback called when socket is either readable or writable
299void 303void
300client::socket_cb (iow &w, int got) 304client::socket_cb (iow &w, int revents)
301{ 305{
302 //TODO remove when we have better socket cleanup logic 306 //TODO remove when we have better socket cleanup logic
303 if (status == Ns_Dead) 307 if (destroyed ())
304 { 308 {
305 socket_ev.poll (0); 309 socket_ev.poll (0);
306 return; 310 return;
307 } 311 }
308 312
309 if (got & PE_W) 313 if (revents & EV_WRITE)
310 { 314 {
311 write_outputbuffer (); 315 write_outputbuffer ();
312 316
313 if (!outputbuffer.len) 317 if (!outputbuffer.len)
314 socket_ev.poll (socket_ev.poll () & ~PE_W); 318 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
315 } 319 }
316 320
317 if (got & PE_R) 321 if (revents & EV_READ)
318 { 322 {
319 //TODO: rate-limit tcp connection in better ways, important 323 //TODO: rate-limit tcp connection in better ways, important
320 324
321 int amount = sizeof (inbuf) - inbuf_len; 325 int amount = sizeof (inbuf) - inbuf_len;
322 326
323 if (!amount) 327 if (!amount)
324 { 328 {
325 // input buffer full 329 // input buffer full
326 socket_ev.poll (socket_ev.poll () & ~PE_R); 330 socket_ev.poll (socket_ev.poll () & ~EV_READ);
327 return; 331 return;
328 } 332 }
329 333
330 amount = read (fd, inbuf + inbuf_len, amount); 334 amount = read (fd, inbuf + inbuf_len, amount);
331 335
… …
347 } 351 }
348 else 352 else
349 { 353 {
350 inbuf_len += amount; 354 inbuf_len += amount;
351 355
352 cst_tot.ibytes += amount; 356 if (handle_packet ())
353 cst_lst.ibytes += amount; 357 {
358 while (handle_packet ())
359 ;
354 360
355 cmd_ev.start (); 361 flush ();
356 } 362 }
363 }
357 } 364 }
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} 365}
369 366
370/******************************************************************************* 367/*******************************************************************************
371 * 368 *
372 * Start of write related routines. 369 * Start of write related routines.
… …
381 */ 378 */
382void 379void
383client::send (void *buf_, int len) 380client::send (void *buf_, int len)
384{ 381{
385 char *buf = (char *)buf_; 382 char *buf = (char *)buf_;
386 char *pos = buf;
387 int amt = 0;
388 383
389 if (status == Ns_Dead || !buf) 384 if (destroyed () || !buf)
390 return; 385 return;
391 386
392 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 387 if (len + outputbuffer.len > SOCKETBUFSIZE)
393 { 388 {
394 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);
395 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);
396 return; 393 return;
397 } 394 }
398 395
399 int avail, end; 396 int avail, end;
400 397
… …
425 * shortcut function. 422 * shortcut function.
426 */ 423 */
427void 424void
428client::send_packet (packet &sl) 425client::send_packet (packet &sl)
429{ 426{
430 if (status == Ns_Dead) 427 if (destroyed ())
431 return; 428 return;
432 429
433 if (sl.length () >= MAXSOCKBUF) 430 if (sl.length () > MAXSOCKBUF)
434 { 431 {
435 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 ());
436 /* 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
437 * it easier to debug. 434 * it easier to debug.
438 */ 435 */
… …
476 va_end (ap); 473 va_end (ap);
477 474
478 send_packet (sl); 475 send_packet (sl);
479} 476}
480 477
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 if (can_msg)
494 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
495 else if (color < 0)
496 return; // client cannot handle this
497 else
498 send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, 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 **********************************************************************/
512
513packet::packet (const char *name)
514{
515 reset ();
516
517 int len = strlen (name);
518 memcpy (cur, name, len); cur += len;
519 *cur++ = ' ';
520}
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}
486 539
487packet &packet::operator <<(const data &v) 540packet &packet::operator <<(const data &v)
488{ 541{
489 if (room () < v.len) 542 if (room () < v.len)
490 reset (); 543 reset ();
… …
528 return reset (); 581 return reset ();
529 582
530 cur += len; 583 cur += len;
531} 584}
532 585
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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