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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.22 by root, Fri Dec 15 19:59:20 2006 UTC vs.
Revision 1.34 by pippijn, Thu Mar 1 12:28:17 2007 UTC

1/* 1/*
2 CrossFire, A Multiplayer game for X-windows 2 * CrossFire, A Multiplayer game for X-windows
3 3 *
4 * Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
4 Copyright (C) 1992 Frank Tore Johansen 5 * Copyright (C) 1992 Frank Tore Johansen
5 6 *
6 This program is free software; you can redistribute it and/or modify 7 * This program 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 2 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, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 20 *
20 The author can be reached via e-mail to mark@pyramid.com 21 * The author can be reached via e-mail to mark@pyramid.com
21*/ 22 */
22 23
23/** 24/**
24 * \file 25 * \file
25 * Low-level socket-related functions. 26 * Low-level socket-related functions.
26 * 27 *
27 * \date 2003-12-02 28 * \date 2003-12-02
… …
40 41
41#ifdef __linux__ 42#ifdef __linux__
42# include <sys/types.h> 43# include <sys/types.h>
43# include <sys/socket.h> 44# include <sys/socket.h>
44# include <netinet/in.h> 45# include <netinet/in.h>
45# define TCP_HZ 1000 // sorry...
46# include <netinet/tcp.h> 46# include <netinet/tcp.h>
47#endif 47#endif
48 48
49// use a really low timeout, as it doesn't cost any bandwidth, and you can 49// use a really low timeout, as it doesn't cost any bandwidth, and you can
50// easily die in 20 seconds... 50// easily die in 20 seconds...
51#define SOCKET_TIMEOUT1 10 51#define SOCKET_TIMEOUT1 10 * 1000
52#define SOCKET_TIMEOUT2 20 52#define SOCKET_TIMEOUT2 20 * 1000
53 53
54void 54void
55client::flush () 55client::flush ()
56{ 56{
57 if (destroyed ())
58 return;
59
57#ifdef __linux__ 60#ifdef __linux__
58 // check time of last ack, and, if too old, kill connection 61 // check time of last ack, and, if too old, kill connection
59 struct tcp_info tcpi; 62 struct tcp_info tcpi;
60 socklen_t len = sizeof (tcpi); 63 socklen_t len = sizeof (tcpi);
61 64
… …
64 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 67 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
65 68
66 rtt = tcpi.tcpi_rtt; 69 rtt = tcpi.tcpi_rtt;
67 rttvar = tcpi.tcpi_rttvar; 70 rttvar = tcpi.tcpi_rttvar;
68 71
69 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s
70 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 73 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
71 { 74 {
72 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 75 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); 76 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
74 status = Ns_Dead; 77 destroy ();
75 } 78 }
76 } 79 }
77#endif 80#endif
78 81
79 /** 82 /**
… …
111#endif 114#endif
112 } 115 }
113 else if (res == 0) 116 else if (res == 0)
114 { 117 {
115 LOG (llevError, "socket write failed, connection closed.\n"); 118 LOG (llevError, "socket write failed, connection closed.\n");
116 status = Ns_Dead; 119 destroy ();
117 return; 120 return;
118 } 121 }
119 else if (errno == EINTR) 122 else if (errno == EINTR)
120 { 123 {
121 // just retry 124 // just retry
… …
128 return; 131 return;
129 } 132 }
130 else 133 else
131 { 134 {
132 LOG (llevError, "socket write failed: %s\n", strerror (errno)); 135 LOG (llevError, "socket write failed: %s\n", strerror (errno));
133 status = Ns_Dead; 136 destroy ();
134 return; 137 return;
135 } 138 }
136 } 139 }
137 140
138 socket_ev.poll (socket_ev.poll () & ~PE_W); 141 socket_ev.poll (socket_ev.poll () & ~PE_W);
139} 142}
140 143
144/******************************************************************************
145 *
146 * Start of read routines.
147 *
148 ******************************************************************************/
149
150int
151client::next_packet ()
152{
153 if (inbuf_len >= 2)
154 {
155 int pkt_len = (inbuf [0] << 8) | inbuf [1];
156
157 if (inbuf_len >= 2 + pkt_len)
158 return 2 + pkt_len;
159
160 if (inbuf_len == sizeof (inbuf))
161 {
162 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
163 destroy ();
164 return -1;
165 }
166 }
167
168 return 0;
169}
170
171void
172client::skip_packet (int len)
173{
174 inbuf_len -= len;
175 memmove (inbuf, inbuf + len, inbuf_len);
176}
177
141/*********************************************************************** 178/*****************************************************************************
142 * 179 * Start of command dispatch area.
143 * packet functions/utilities 180 * The commands here are protocol commands.
144 *
145 **********************************************************************/ 181 ****************************************************************************/
146 182
147packet &packet::operator <<(const data &v) 183// SocketCommand, PlayingCommand, should not exist with those ugly casts
184#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
185#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
186
187/**
188 * Dispatch table for the server.
189 */
190static struct packet_type packets[] = {
191 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
192 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
193
194 {"examine", PC(ExamineCmd) PF_PLAYING },
195 {"apply", PC(ApplyCmd) PF_PLAYING },
196 {"lookat", PC(LookAt) PF_PLAYING },
197 {"lock", PC(LockItem) PF_PLAYING },
198 {"mark", PC(MarkItem) PF_PLAYING },
199 {"move", PC(MoveCmd) PF_PLAYING },
200 {"ext", PC(ExtCmd) 0 }, /* CF+ */
201 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */
202 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */
203
204 {"reply", SC(ReplyCmd) 0 },
205 {"exti", SC(ExtiCmd) 0 }, /* CF+ */
206 {"addme", SC(AddMeCmd) 0 },
207 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */
208 {"requestinfo", SC(RequestInfo) 0 },
209 {"setfacemode", SC(SetFaceMode) 0 },
210 {"setsound", SC(SetSound) 0 },
211 {"setup", SC(SetUp) 0 },
212 {"version", SC(VersionCmd) 0 },
213 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
214 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
215 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
216};
217
218bool
219client::may_execute (const packet_type *pkt) const
148{ 220{
149 if (room () < v.len) 221 return (!(pkt->flags & PF_PLAYER) || pl)
150 reset (); 222 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
223}
224
225// HACK: some commands currently should be executed
226// even when the player is frozen. this hack detects
227// those commands. it should be folded into may_execute,
228// but kept seperate to emphasise the hack aspect, i.e.
229// do it better, then remove.
230static bool
231always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
232{
233 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
234 return false;
235
236 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
237 return false;
238
239 if (pkt->flags & PF_COMMAND6)
240 {
241 data += 6;
242 len -= 6;
243 }
244
245 if (len > 4 && !strncmp (data, "say " , 4))
246 return true;
247 if (len > 5 && !strncmp (data, "chat ", 5))
248 return true;
249
250 return false;
251}
252
253void
254client::execute (const packet_type *pkt, char *data, int datalen)
255{
256 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
257 {
258 //TODO: only one format
259 if (pkt->flags & PF_PLAYER)
260 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
261 else
262 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
263 }
151 else 264 else
265 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
266}
267
268bool
269client::handle_packet ()
270{
271 int pkt_len = next_packet ();
272
273 if (!pkt_len)
274 return false;
275 else if (pkt_len < 0)
276 {
277 LOG (llevError, "read error on player %s\n",
278 pl && pl->ob ? &pl->ob->name : "[anonymous]");
279 destroy ();
280 return false;
152 { 281 }
153 if (v.len) 282
283 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
284
285 /* First, break out beginning word. There are at least
286 * a few commands that do not have any paremeters. If
287 * we get such a command, don't worry about trying
288 * to break it up.
289 */
290 int datalen;
291 char *data = strchr ((char *)inbuf + 2, ' ');
292
293 if (data)
294 {
295 *data++ = 0;
296 datalen = pkt_len - (data - (char *)inbuf);
297 }
298 else
299 {
300 data = (char *)inbuf + 2; // better read garbage than segfault
301 datalen = 0;
302 }
303
304 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
305 if (!strcmp ((char *)inbuf + 2, pkt->name))
154 { 306 {
155 memcpy (cur, v.ptr, v.len); 307 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
156 cur += v.len; 308 queue_command (pkt, data, datalen);
309 else
310 execute (pkt, data, datalen);
311
312 goto next_packet;
157 } 313 }
314
315 // If we get here, we didn't find a valid command.
316 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
317next_packet:
318 skip_packet (pkt_len);
319
320 // input buffer has space again
321 socket_ev.poll (socket_ev.poll () | PE_R);
322
323 return true;
324}
325
326// callback called when socket is either readable or writable
327void
328client::socket_cb (iow &w, int got)
329{
330 //TODO remove when we have better socket cleanup logic
331 if (destroyed ())
158 } 332 {
159 333 socket_ev.poll (0);
160 return *this; 334 return;
161}
162
163packet &packet::operator <<(const data8 &v)
164{
165 unsigned int len = min (v.len, 0x00FF);
166 return *this << uint8 (len) << data (v.ptr, len);
167}
168
169packet &packet::operator <<(const data16 &v)
170{
171 unsigned int len = min (v.len, 0xFFFF);
172 return *this << uint16 (len) << data (v.ptr, len);
173}
174
175packet &packet::operator <<(const char *v)
176{
177 return *this << data (v, strlen (v ? v : 0));
178}
179
180void
181packet::printf (const char *format, ...)
182{
183 int size = room ();
184
185 va_list ap;
186 va_start (ap, format);
187 int len = vsnprintf ((char *)cur, size, format, ap);
188 va_end (ap);
189
190 if (len >= size)
191 return reset ();
192
193 cur += len;
194}
195
196/******************************************************************************
197 *
198 * Start of read routines.
199 *
200 ******************************************************************************/
201
202int
203client::read_packet ()
204{
205 for (;;)
206 { 335 }
207 if (inbuf_len >= 2)
208 {
209 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1];
210 336
211 if (inbuf_len >= 2 + pkt_len) 337 if (got & PE_W)
212 return pkt_len + 2; 338 {
213 } 339 write_outputbuffer ();
340
341 if (!outputbuffer.len)
342 socket_ev.poll (socket_ev.poll () & ~PE_W);
343 }
344
345 if (got & PE_R)
346 {
347 //TODO: rate-limit tcp connection in better ways, important
214 348
215 int amount = sizeof (inbuf) - inbuf_len; 349 int amount = sizeof (inbuf) - inbuf_len;
216 350
217 if (amount <= 0) 351 if (!amount)
218 { 352 {
219 LOG (llevError, "packet too large");//TODO 353 // input buffer full
354 socket_ev.poll (socket_ev.poll () & ~PE_R);
220 return -1; 355 return;
221 } 356 }
222 357
223 amount = read (fd, inbuf + inbuf_len, amount); 358 amount = read (fd, inbuf + inbuf_len, amount);
224 359
225 if (!amount) 360 if (!amount)
226 { 361 {
227 status = Ns_Dead; 362 destroy ();
228 return -1; 363 return;
229 } 364 }
230 else if (amount < 0) 365 else if (amount < 0)
231 { 366 {
232 if (errno != EAGAIN && errno != EINTR) 367 if (errno != EAGAIN && errno != EINTR)
233 { 368 {
234 LOG (llevError, "read error: %s\n", strerror (errno)); 369 LOG (llevError, "read error: %s\n", strerror (errno));
370 destroy ();
235 return -1; 371 return;
236 } 372 }
237 373
238 return 0; 374 // should not be here, normally
375 }
376 else
239 } 377 {
240
241 inbuf_len += amount; 378 inbuf_len += amount;
242 379
243 cst_tot.ibytes += amount; 380 cst_tot.ibytes += amount;
244 cst_lst.ibytes += amount; 381 cst_lst.ibytes += amount;
245 }
246}
247 382
383 cmd_ev.start ();
384 }
385 }
386}
387
388// called whenever we have additional commands to process
248void 389void
249client::skip_packet (int len) 390client::cmd_cb (iw &w)
250{ 391{
251 inbuf_len -= len; 392 if (handle_packet ())
252 memmove (inbuf, inbuf + len, inbuf_len); 393 w.start ();
394 else
395 flush ();
253} 396}
254 397
255/******************************************************************************* 398/*******************************************************************************
256 * 399 *
257 * Start of write related routines. 400 * Start of write related routines.
… …
266 */ 409 */
267void 410void
268client::send (void *buf_, int len) 411client::send (void *buf_, int len)
269{ 412{
270 char *buf = (char *)buf_; 413 char *buf = (char *)buf_;
271 char *pos = buf;
272 int amt = 0;
273 414
274 if (status == Ns_Dead || !buf) 415 if (destroyed () || !buf)
275 {
276 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
277 return; 416 return;
278 }
279 417
280 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 418 if (len + outputbuffer.len > SOCKETBUFSIZE)
281 { 419 {
282 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", fd); 420 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
283 status = Ns_Dead; 421 destroy ();
284 return; 422 return;
285 } 423 }
286 424
287 int avail, end; 425 int avail, end;
288 426
… …
306 } 444 }
307 445
308 outputbuffer.len += len; 446 outputbuffer.len += len;
309} 447}
310 448
311void
312client::socket_cb (iow &w, int got)
313{
314 write_outputbuffer ();
315
316 if (!outputbuffer.len)
317 socket_ev.poll (socket_ev.poll () & ~PE_W);
318}
319
320/** 449/**
321 * Takes a string of data, and writes it out to the socket. A very handy 450 * Takes a string of data, and writes it out to the socket. A very handy
322 * shortcut function. 451 * shortcut function.
323 */ 452 */
324void 453void
325client::send_packet (packet &sl) 454client::send_packet (packet &sl)
326{ 455{
327 if (status == Ns_Dead) 456 if (destroyed ())
328 return; 457 return;
329 458
330 if (sl.length () >= MAXSOCKBUF) 459 if (sl.length () >= MAXSOCKBUF)
331 { 460 {
332 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 461 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
… …
358 487
359void 488void
360client::send_packet (const char *buf) 489client::send_packet (const char *buf)
361{ 490{
362 send_packet (buf, strlen (buf)); 491 send_packet (buf, strlen (buf));
492}
493
494void
495client::send_packet_printf (const char *format, ...)
496{
497 packet sl;
498
499 va_list ap;
500 va_start (ap, format);
501 sl.vprintf (format, ap);
502 va_end (ap);
503
504 send_packet (sl);
505}
506
507/***********************************************************************
508 *
509 * packet functions/utilities
510 *
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 data &v)
523{
524 if (room () < v.len)
525 reset ();
526 else
527 {
528 if (v.len)
529 {
530 memcpy (cur, v.ptr, v.len);
531 cur += v.len;
532 }
533 }
534
535 return *this;
536}
537
538packet &packet::operator <<(const data8 &v)
539{
540 unsigned int len = min (v.len, 0x00FF);
541 return *this << uint8 (len) << data (v.ptr, len);
542}
543
544packet &packet::operator <<(const data16 &v)
545{
546 unsigned int len = min (v.len, 0xFFFF);
547 return *this << uint16 (len) << data (v.ptr, len);
548}
549
550packet &packet::operator <<(const char *v)
551{
552 return *this << data (v, strlen (v ? v : 0));
553}
554
555void
556packet::vprintf (const char *format, va_list ap)
557{
558 int size = room ();
559
560 int len = vsnprintf ((char *)cur, size, format, ap);
561
562 if (len >= size)
563 return reset ();
564
565 cur += len;
363} 566}
364 567
365/****************************************************************************** 568/******************************************************************************
366 * 569 *
367 * statistics logging functions. 570 * statistics logging functions.

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