ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/deliantra/server/socket/lowlevel.C
(Generate patch)

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.25 by root, Sun Dec 17 19:14:00 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 destroy (); 77 destroy ();
75 } 78 }
183 186
184/** 187/**
185 * Dispatch table for the server. 188 * Dispatch table for the server.
186 */ 189 */
187static struct packet_type packets[] = { 190static struct packet_type packets[] = {
188 {"ncom", PC(NewPlayerCmd) PF_PLAYING }, 191 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
189 {"command", PC(PlayerCmd) PF_PLAYING }, 192 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
190 193
191 {"examine", PC(ExamineCmd) PF_PLAYING }, 194 {"examine", PC(ExamineCmd) PF_PLAYING },
192 {"apply", PC(ApplyCmd) PF_PLAYING }, 195 {"apply", PC(ApplyCmd) PF_PLAYING },
193 {"reply", PC(ReplyCmd) PF_IMMEDIATE },
194 {"lookat", PC(LookAt) PF_PLAYING }, 196 {"lookat", PC(LookAt) PF_PLAYING },
195 {"lock", PC(LockItem) PF_PLAYING }, 197 {"lock", PC(LockItem) PF_PLAYING },
196 {"mark", PC(MarkItem) PF_PLAYING }, 198 {"mark", PC(MarkItem) PF_PLAYING },
197 {"move", PC(MoveCmd) PF_PLAYING }, 199 {"move", PC(MoveCmd) PF_PLAYING },
198 {"exti", PC(ExtCmd) PF_IMMEDIATE }, /* CF+ */
199 {"ext", PC(ExtCmd) 0 }, /* CF+ */ 200 {"ext", PC(ExtCmd) 0 }, /* CF+ */
200 {"mapredraw", PC(MapRedrawCmd) PF_IMMEDIATE }, /* Added: phil */ 201 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */
201 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ 202 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */
202 203
204 {"reply", SC(ReplyCmd) 0 },
205 {"exti", SC(ExtiCmd) 0 }, /* CF+ */
203 {"addme", SC(AddMeCmd) PF_IMMEDIATE }, 206 {"addme", SC(AddMeCmd) 0 },
204 {"askface", SC(SendFaceCmd) PF_IMMEDIATE }, /* Added: phil */ 207 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */
205 {"requestinfo", SC(RequestInfo) PF_IMMEDIATE }, 208 {"requestinfo", SC(RequestInfo) 0 },
206 {"setfacemode", SC(SetFaceMode) PF_IMMEDIATE }, 209 {"setfacemode", SC(SetFaceMode) 0 },
207 {"setsound", SC(SetSound) PF_IMMEDIATE }, 210 {"setsound", SC(SetSound) 0 },
208 {"setup", SC(SetUp) PF_IMMEDIATE }, 211 {"setup", SC(SetUp) 0 },
209 {"version", SC(VersionCmd) PF_IMMEDIATE }, 212 {"version", SC(VersionCmd) 0 },
210 {"toggleextendedinfos", SC(ToggleExtendedInfos) PF_IMMEDIATE }, /*Added: tchize */ 213 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
211 {"toggleextendedtext", SC(ToggleExtendedText) PF_IMMEDIATE }, /*Added: tchize */ 214 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
212 {"asksmooth", SC(AskSmooth) PF_IMMEDIATE }, /*Added: tchize (smoothing technologies) */ 215 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
213}; 216};
214 217
215bool 218bool
216client::may_execute (const packet_type *pkt) const 219client::may_execute (const packet_type *pkt) const
217{ 220{
218 return (!(pkt->flags & PF_PLAYER) || pl) 221 return (!(pkt->flags & PF_PLAYER) || pl)
219 && (!(pkt->flags & PF_PLAYING) || (pl && pl->state == ST_PLAYING)); 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;
220} 251}
221 252
222void 253void
223client::execute (const packet_type *pkt, char *data, int datalen) 254client::execute (const packet_type *pkt, char *data, int datalen)
224{ 255{
225 if (may_execute (pkt)) 256 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
226 { 257 {
227 //TODO: only one format 258 //TODO: only one format
228 if (pkt->flags & PF_PLAYER) 259 if (pkt->flags & PF_PLAYER)
229 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 260 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
230 else 261 else
271 } 302 }
272 303
273 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) 304 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
274 if (!strcmp ((char *)inbuf + 2, pkt->name)) 305 if (!strcmp ((char *)inbuf + 2, pkt->name))
275 { 306 {
276 if (pkt->flags & PF_IMMEDIATE) 307 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
308 queue_command (pkt, data, datalen);
309 else
277 execute (pkt, data, datalen); 310 execute (pkt, data, datalen);
278 else
279 queue_command (pkt, data, datalen);
280 311
281 goto next_packet; 312 goto next_packet;
282 } 313 }
283 314
284 /* If we get here, we didn't find a valid command. Logging 315 // 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); 316 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
289next_packet: 317next_packet:
290 skip_packet (pkt_len); 318 skip_packet (pkt_len);
291 319
292 // input buffer has space again 320 // input buffer has space again
298// callback called when socket is either readable or writable 326// callback called when socket is either readable or writable
299void 327void
300client::socket_cb (iow &w, int got) 328client::socket_cb (iow &w, int got)
301{ 329{
302 //TODO remove when we have better socket cleanup logic 330 //TODO remove when we have better socket cleanup logic
303 if (status == Ns_Dead) 331 if (destroyed ())
304 { 332 {
305 socket_ev.poll (0); 333 socket_ev.poll (0);
306 return; 334 return;
307 } 335 }
308 336
359 387
360// called whenever we have additional commands to process 388// called whenever we have additional commands to process
361void 389void
362client::cmd_cb (iw &w) 390client::cmd_cb (iw &w)
363{ 391{
364 if (handle_packet () || handle_command ()) 392 if (handle_packet ())
365 w.start (); 393 w.start ();
366 else 394 else
367 flush (); 395 flush ();
368} 396}
369 397
381 */ 409 */
382void 410void
383client::send (void *buf_, int len) 411client::send (void *buf_, int len)
384{ 412{
385 char *buf = (char *)buf_; 413 char *buf = (char *)buf_;
386 char *pos = buf;
387 int amt = 0;
388 414
389 if (status == Ns_Dead || !buf) 415 if (destroyed () || !buf)
390 return; 416 return;
391 417
392 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 418 if (len + outputbuffer.len > SOCKETBUFSIZE)
393 { 419 {
394 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);
395 destroy (); 421 destroy ();
396 return; 422 return;
397 } 423 }
425 * shortcut function. 451 * shortcut function.
426 */ 452 */
427void 453void
428client::send_packet (packet &sl) 454client::send_packet (packet &sl)
429{ 455{
430 if (status == Ns_Dead) 456 if (destroyed ())
431 return; 457 return;
432 458
433 if (sl.length () >= MAXSOCKBUF) 459 if (sl.length () >= MAXSOCKBUF)
434 { 460 {
435 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 ());
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}
486 521
487packet &packet::operator <<(const data &v) 522packet &packet::operator <<(const data &v)
488{ 523{
489 if (room () < v.len) 524 if (room () < v.len)
490 reset (); 525 reset ();

Diff Legend

Removed lines
+ Added lines
< Changed lines
> Changed lines