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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.21 by root, Fri Dec 15 00:14:13 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
… …
33 */ 34 */
34 35
35using namespace std; 36using namespace std;
36 37
37#include <global.h> 38#include <global.h>
38#include <newclient.h>
39#include <sproto.h> 39#include <sproto.h>
40#include <cstdarg> 40#include <cstdarg>
41 41
42#ifdef __linux__ 42#ifdef __linux__
43# include <sys/types.h> 43# include <sys/types.h>
44# include <sys/socket.h> 44# include <sys/socket.h>
45# include <netinet/in.h> 45# include <netinet/in.h>
46# define TCP_HZ 1000 // sorry...
47# include <netinet/tcp.h> 46# include <netinet/tcp.h>
48#endif 47#endif
49 48
50// 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
51// easily die in 20 seconds... 50// easily die in 20 seconds...
52#define SOCKET_TIMEOUT1 10 51#define SOCKET_TIMEOUT1 10 * 1000
53#define SOCKET_TIMEOUT2 20 52#define SOCKET_TIMEOUT2 20 * 1000
54 53
55void 54void
56client_socket::flush () 55client::flush ()
57{ 56{
57 if (destroyed ())
58 return;
59
58#ifdef __linux__ 60#ifdef __linux__
59 // check time of last ack, and, if too old, kill connection 61 // check time of last ack, and, if too old, kill connection
60 struct tcp_info tcpi; 62 struct tcp_info tcpi;
61 socklen_t len = sizeof (tcpi); 63 socklen_t len = sizeof (tcpi);
62 64
… …
65 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;
66 68
67 rtt = tcpi.tcpi_rtt; 69 rtt = tcpi.tcpi_rtt;
68 rttvar = tcpi.tcpi_rttvar; 70 rttvar = tcpi.tcpi_rttvar;
69 71
70 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
71 && 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
72 { 74 {
73 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,
74 (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);
75 status = Ns_Dead; 77 destroy ();
76 } 78 }
77 } 79 }
78#endif 80#endif
79 81
80 /** 82 /**
… …
89 91
90 write_outputbuffer (); 92 write_outputbuffer ();
91} 93}
92 94
93void 95void
94client_socket::write_outputbuffer () 96client::write_outputbuffer ()
95{ 97{
96 while (outputbuffer.len) 98 while (outputbuffer.len)
97 { 99 {
98 int res = write (fd, outputbuffer.data + outputbuffer.start, 100 int res = write (fd, outputbuffer.data + outputbuffer.start,
99 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start)); 101 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
… …
112#endif 114#endif
113 } 115 }
114 else if (res == 0) 116 else if (res == 0)
115 { 117 {
116 LOG (llevError, "socket write failed, connection closed.\n"); 118 LOG (llevError, "socket write failed, connection closed.\n");
117 status = Ns_Dead; 119 destroy ();
118 return; 120 return;
119 } 121 }
120 else if (errno == EINTR) 122 else if (errno == EINTR)
121 { 123 {
122 // just retry 124 // just retry
… …
129 return; 131 return;
130 } 132 }
131 else 133 else
132 { 134 {
133 LOG (llevError, "socket write failed: %s\n", strerror (errno)); 135 LOG (llevError, "socket write failed: %s\n", strerror (errno));
134 status = Ns_Dead; 136 destroy ();
135 return; 137 return;
136 } 138 }
137 } 139 }
138 140
139 socket_ev.poll (socket_ev.poll () & ~PE_W); 141 socket_ev.poll (socket_ev.poll () & ~PE_W);
140} 142}
141 143
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
142/*********************************************************************** 178/*****************************************************************************
143 * 179 * Start of command dispatch area.
144 * packet functions/utilities 180 * The commands here are protocol commands.
145 *
146 **********************************************************************/ 181 ****************************************************************************/
147 182
148packet &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
149{ 220{
150 if (room () < v.len) 221 return (!(pkt->flags & PF_PLAYER) || pl)
151 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 }
152 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;
153 { 281 }
154 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))
155 { 306 {
156 memcpy (cur, v.ptr, v.len); 307 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
157 cur += v.len; 308 queue_command (pkt, data, datalen);
309 else
310 execute (pkt, data, datalen);
311
312 goto next_packet;
158 } 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 ())
159 } 332 {
160 333 socket_ev.poll (0);
161 return *this; 334 return;
162}
163
164packet &packet::operator <<(const data8 &v)
165{
166 unsigned int len = min (v.len, 0x00FF);
167 return *this << uint8 (len) << data (v.ptr, len);
168}
169
170packet &packet::operator <<(const data16 &v)
171{
172 unsigned int len = min (v.len, 0xFFFF);
173 return *this << uint16 (len) << data (v.ptr, len);
174}
175
176packet &packet::operator <<(const char *v)
177{
178 return *this << data (v, strlen (v ? v : 0));
179}
180
181void
182packet::printf (const char *format, ...)
183{
184 int size = room ();
185
186 va_list ap;
187 va_start (ap, format);
188 int len = vsnprintf ((char *)cur, size, format, ap);
189 va_end (ap);
190
191 if (len >= size)
192 return reset ();
193
194 cur += len;
195}
196
197/******************************************************************************
198 *
199 * Start of read routines.
200 *
201 ******************************************************************************/
202
203int
204client_socket::read_packet ()
205{
206 for (;;)
207 { 335 }
208 if (inbuf_len >= 2)
209 {
210 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1];
211 336
212 if (inbuf_len >= 2 + pkt_len) 337 if (got & PE_W)
213 return pkt_len + 2; 338 {
214 } 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
215 348
216 int amount = sizeof (inbuf) - inbuf_len; 349 int amount = sizeof (inbuf) - inbuf_len;
217 350
218 if (amount <= 0) 351 if (!amount)
219 { 352 {
220 LOG (llevError, "packet too large");//TODO 353 // input buffer full
354 socket_ev.poll (socket_ev.poll () & ~PE_R);
221 return -1; 355 return;
222 } 356 }
223 357
224 amount = read (fd, inbuf + inbuf_len, amount); 358 amount = read (fd, inbuf + inbuf_len, amount);
225 359
226 if (!amount) 360 if (!amount)
227 { 361 {
228 status = Ns_Dead; 362 destroy ();
229 return -1; 363 return;
230 } 364 }
231 else if (amount < 0) 365 else if (amount < 0)
232 { 366 {
233 if (errno != EAGAIN && errno != EINTR) 367 if (errno != EAGAIN && errno != EINTR)
234 { 368 {
235 LOG (llevError, "read error: %s\n", strerror (errno)); 369 LOG (llevError, "read error: %s\n", strerror (errno));
370 destroy ();
236 return -1; 371 return;
237 } 372 }
238 373
239 return 0; 374 // should not be here, normally
375 }
376 else
240 } 377 {
241
242 inbuf_len += amount; 378 inbuf_len += amount;
243 379
244 cst_tot.ibytes += amount; 380 cst_tot.ibytes += amount;
245 cst_lst.ibytes += amount; 381 cst_lst.ibytes += amount;
246 }
247}
248 382
383 cmd_ev.start ();
384 }
385 }
386}
387
388// called whenever we have additional commands to process
249void 389void
250client_socket::skip_packet (int len) 390client::cmd_cb (iw &w)
251{ 391{
252 inbuf_len -= len; 392 if (handle_packet ())
253 memmove (inbuf, inbuf + len, inbuf_len); 393 w.start ();
394 else
395 flush ();
254} 396}
255 397
256/******************************************************************************* 398/*******************************************************************************
257 * 399 *
258 * Start of write related routines. 400 * Start of write related routines.
… …
264 * 406 *
265 * ns is the socket we are adding the data to, buf is the start of the 407 * ns is the socket we are adding the data to, buf is the start of the
266 * data, and len is the number of bytes to add. 408 * data, and len is the number of bytes to add.
267 */ 409 */
268void 410void
269client_socket::send (void *buf_, int len) 411client::send (void *buf_, int len)
270{ 412{
271 char *buf = (char *)buf_; 413 char *buf = (char *)buf_;
272 char *pos = buf;
273 int amt = 0;
274 414
275 if (status == Ns_Dead || !buf) 415 if (destroyed () || !buf)
276 {
277 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
278 return; 416 return;
279 }
280 417
281 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 418 if (len + outputbuffer.len > SOCKETBUFSIZE)
282 { 419 {
283 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);
284 status = Ns_Dead; 421 destroy ();
285 return; 422 return;
286 } 423 }
287 424
288 int avail, end; 425 int avail, end;
289 426
… …
307 } 444 }
308 445
309 outputbuffer.len += len; 446 outputbuffer.len += len;
310} 447}
311 448
312void
313client_socket::socket_cb (iow &w, int got)
314{
315 write_outputbuffer ();
316
317 if (!outputbuffer.len)
318 socket_ev.poll (socket_ev.poll () & ~PE_W);
319}
320
321/** 449/**
322 * 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
323 * shortcut function. 451 * shortcut function.
324 */ 452 */
325void 453void
326client_socket::send_packet (packet &sl) 454client::send_packet (packet &sl)
327{ 455{
328 if (status == Ns_Dead) 456 if (destroyed ())
329 return; 457 return;
330 458
331 if (sl.length () >= MAXSOCKBUF) 459 if (sl.length () >= MAXSOCKBUF)
332 { 460 {
333 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 ());
… …
347 475
348 send (sl.buf_, sl.length () + sl.hdrlen); 476 send (sl.buf_, sl.length () + sl.hdrlen);
349} 477}
350 478
351void 479void
352client_socket::send_packet (const char *buf, int len) 480client::send_packet (const char *buf, int len)
353{ 481{
354 packet sl; 482 packet sl;
355 483
356 sl << data (buf, len); 484 sl << data (buf, len);
357 send_packet (sl); 485 send_packet (sl);
358} 486}
359 487
360void 488void
361client_socket::send_packet (const char *buf) 489client::send_packet (const char *buf)
362{ 490{
363 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;
364} 566}
365 567
366/****************************************************************************** 568/******************************************************************************
367 * 569 *
368 * statistics logging functions. 570 * statistics logging functions.

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