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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.44 by root, Sat Jun 9 22:54:28 2007 UTC vs.
Revision 1.83 by root, Sat Apr 23 04:56:58 2011 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 (©) 2005,2006,2007,2008,2009,2010,2011 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 * Copyright (©) 1992,2007 Frank Tore Johansen
6 * 5 *
7 * Crossfire TRT is free software; you can redistribute it and/or modify it 6 * 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 7 * 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) 8 * Free Software Foundation, either version 3 of the License, or (at your
10 * any later version. 9 * option) any later version.
11 * 10 *
12 * This program is distributed in the hope that it will be useful, but 11 * This program is distributed in the hope that it will be useful,
13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * for more details. 14 * GNU General Public License for more details.
16 * 15 *
17 * You should have received a copy of the GNU General Public License along 16 * 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 17 * and the GNU General Public License along with this program. If not, see
19 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 * <http://www.gnu.org/licenses/>.
20 * 19 *
21 * The authors can be reached via e-mail to <crossfire@schmorp.de> 20 * 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 */ 21 */
35 22
36using namespace std; 23using namespace std;
37 24
38#include <global.h> 25#include <global.h>
39#include <sproto.h> 26#include <sproto.h>
40#include <cstdarg> 27#include <cstdarg>
41 28
42#ifdef __linux__ 29#if HAVE_TCP_INFO
43# include <sys/types.h> 30# include <sys/types.h>
44# include <sys/socket.h> 31# include <sys/socket.h>
45# include <netinet/in.h> 32# include <netinet/in.h>
46# include <netinet/tcp.h> 33# include <netinet/tcp.h>
47#endif 34#endif
48 35
49// disconnect a socket after this many seconds without an ack
50#define SOCKET_TIMEOUT 8.
51
52// force a packet when idle for more than this many seconds, 36// force a packet when idle for more than this many seconds,
53// forcing an ack regularly. 37// forcing an ack regularly.
54#define IDLE_PING 2. 38#define IDLE_PING 2.
55 39
56void 40void
57client::flush () 41client::flush ()
58{ 42{
59 if (destroyed ()) 43 if (destroyed ())
60 return; 44 return;
61
62#ifdef __linux__ //TODO: this is available on bsds, too, use a configure test.
63 // check about once per second, spread evenly over all clients
64 if (!((pticks + fd) & 7))
65 {
66 // check time of last ack, and, if too old, kill connection
67 struct tcp_info tcpi;
68 socklen_t len = sizeof (tcpi);
69
70 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
71 {
72 rtt = tcpi.tcpi_rtt;
73 rttvar = tcpi.tcpi_rttvar;
74
75 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
76 {
77 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
78 write_outputbuffer ();
79
80 LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
81 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
82 destroy ();
83 }
84 }
85 }
86#endif
87 45
88 /** 46 /**
89 * Writes data to socket. 47 * Writes data to socket.
90 * 48 *
91 * 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
… …
93 */ 51 */
94 52
95 // write a nop to the socket at least every IDLE_NOP seconds. 53 // write a nop to the socket at least every IDLE_NOP seconds.
96 if (!outputbuffer.len) 54 if (!outputbuffer.len)
97 { 55 {
98 if (last_send + IDLE_PING <= NOW) 56 if (last_send + IDLE_PING <= NOW && pl && pl->active)
99 { 57 {
100 // this is a bit ugly, but map1/map1a seem to be the only 58 // this is a bit ugly, but map1a seems to be the only
101 // nop'able commands and they are quite small. 59 // nop'able command and it is quite small.
102 packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); 60 packet sl ("map1a");
103 send_packet (sl); 61 send_packet (sl);
104 } 62 }
105 else 63 else
106 return; 64 return;
107 } 65 }
108 66
109 if (socket_ev.poll () & PE_W) 67 if (socket_ev.poll () & EV_WRITE)
110 return; 68 return;
111 69
112 last_send = NOW; 70 last_send = NOW;
113 write_outputbuffer (); 71 write_outputbuffer ();
114} 72}
… …
141 // just retry 99 // just retry
142 } 100 }
143 else if (errno == EAGAIN) 101 else if (errno == EAGAIN)
144 { 102 {
145 // delay till ready 103 // delay till ready
146 socket_ev.poll (socket_ev.poll () | PE_W); 104 socket_ev.poll (socket_ev.poll () | EV_WRITE);
147 socket_ev.start (); 105 socket_ev.start ();
148 return; 106 return;
149 } 107 }
150 else 108 else
151 { 109 {
… …
153 destroy (); 111 destroy ();
154 return; 112 return;
155 } 113 }
156 } 114 }
157 115
158 socket_ev.poll (socket_ev.poll () & ~PE_W); 116 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
159} 117}
160 118
161/****************************************************************************** 119/******************************************************************************
162 * 120 *
163 * Start of read routines. 121 * Start of read routines.
… …
174 if (inbuf_len >= 2 + pkt_len) 132 if (inbuf_len >= 2 + pkt_len)
175 return 2 + pkt_len; 133 return 2 + pkt_len;
176 134
177 if (inbuf_len == sizeof (inbuf)) 135 if (inbuf_len == sizeof (inbuf))
178 { 136 {
179 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);
180 destroy (); 138 destroy ();
181 return -1; 139 return -1;
182 } 140 }
183 } 141 }
184 142
… …
198 ****************************************************************************/ 156 ****************************************************************************/
199 157
200// SocketCommand, PlayingCommand, should not exist with those ugly casts 158// SocketCommand, PlayingCommand, should not exist with those ugly casts
201#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb), 159#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
202#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER | 160#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
161
162static void
163NopCmd (char *, int, client *)
164{
165 // do nothing
166}
203 167
204/** 168/**
205 * Dispatch table for the server. 169 * Dispatch table for the server.
206 */ 170 */
207static struct packet_type packets[] = { 171static struct packet_type packets[] = {
… …
213 {"apply", PC(ApplyCmd) PF_PLAYING }, 177 {"apply", PC(ApplyCmd) PF_PLAYING },
214 {"lookat", PC(LookAt) PF_PLAYING }, 178 {"lookat", PC(LookAt) PF_PLAYING },
215 {"lock", PC(LockItem) PF_PLAYING }, 179 {"lock", PC(LockItem) PF_PLAYING },
216 {"mark", PC(MarkItem) PF_PLAYING }, 180 {"mark", PC(MarkItem) PF_PLAYING },
217 {"move", PC(MoveCmd) PF_PLAYING }, 181 {"move", PC(MoveCmd) PF_PLAYING },
218 {"ext", PC(ExtCmd) 0 }, // CF+ 182 {"ext", PC(ExtCmd) 0 }, // CF+/Deliantra
219 {"mapredraw", PC(MapRedrawCmd) 0 }, 183 {"mapredraw", PC(MapRedrawCmd) 0 },
220 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+ 184 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+/Deliantra
221 185
222 {"reply", SC(ReplyCmd) 0 }, 186 {"reply", SC(ReplyCmd) 0 },
223 {"exti", SC(ExtiCmd) 0 }, // CF+ 187 {"exti", SC(ExtiCmd) 0 }, // CF+/Deliantra
224 {"addme", SC(AddMeCmd) 0 }, 188 {"addme", SC(AddMeCmd) 0 },
225 {"askface", SC(AskFaceCmd) 0 }, 189 {"askface", SC(AskFaceCmd) 0 },
226 {"requestinfo", SC(RequestInfo) 0 }, 190 {"requestinfo", SC(RequestInfo) 0 },
227 {"setfacemode", SC(SetFaceMode) 0 },
228 {"setsound", SC(SetSound) 0 }, 191 {"setsound", SC(SetSound) 0 },
229 {"setup", SC(SetUp) 0 }, 192 {"setup", SC(SetUp) 0 },
230 {"version", SC(VersionCmd) 0 }, 193 {"version", SC(VersionCmd) 0 },
231 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */ 194
232 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */ 195 {"toggleextendedtext", SC(NopCmd) 0 }, // deliantra: disabled
233 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
234}; 196};
235 197
236bool 198bool
237client::may_execute (const packet_type *pkt) const 199client::may_execute (const packet_type *pkt) const
238{ 200{
… …
258 { 220 {
259 data += 6; 221 data += 6;
260 len -= 6; 222 len -= 6;
261 } 223 }
262 224
263 if (len > 4 && !strncmp (data, "say " , 4)) 225 if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
264 return true; 226 if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
265 if (len > 5 && !strncmp (data, "chat ", 5)) 227 if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
266 return true; 228 if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
229 if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
230
231 if (len == 7 && !strcmp (data, "suicide")) return true;
267 232
268 return false; 233 return false;
269} 234}
270 235
271void 236void
… …
273{ 238{
274 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen)) 239 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
275 { 240 {
276 //TODO: only one format 241 //TODO: only one format
277 if (pkt->flags & PF_PLAYER) 242 if (pkt->flags & PF_PLAYER)
243 {
278 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 244 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
245 pl->need_updated_stats ();
246 }
279 else 247 else
280 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 248 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
281 } 249 }
282 else 250 else
283 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); 251 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
284} 252}
285 253
286bool 254bool
287client::handle_packet () 255client::handle_packet ()
288{ 256{
… …
296 pl && pl->ob ? &pl->ob->name : "[anonymous]"); 264 pl && pl->ob ? &pl->ob->name : "[anonymous]");
297 destroy (); 265 destroy ();
298 return false; 266 return false;
299 } 267 }
300 268
269 uint8_t save_byte = inbuf [pkt_len]; // rather ugly
301 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */ 270 inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
302 271
303 /* First, break out beginning word. There are at least 272 /* First, break out beginning word. There are at least
304 * a few commands that do not have any paremeters. If 273 * a few commands that do not have any paremeters. If
305 * we get such a command, don't worry about trying 274 * we get such a command, don't worry about trying
306 * to break it up. 275 * to break it up.
… …
317 { 286 {
318 data = (char *)inbuf + 2; // better read garbage than segfault 287 data = (char *)inbuf + 2; // better read garbage than segfault
319 datalen = 0; 288 datalen = 0;
320 } 289 }
321 290
322 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) 291 for (packet_type *pkt = packets; pkt < packets + array_length (packets); ++pkt)
323 if (!strcmp ((char *)inbuf + 2, pkt->name)) 292 if (!strcmp ((char *)inbuf + 2, pkt->name))
324 { 293 {
325 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen)) 294 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
326 queue_command (pkt, data, datalen); 295 queue_command (pkt, data, datalen);
327 else 296 else
… …
329 298
330 goto next_packet; 299 goto next_packet;
331 } 300 }
332 301
333 // If we get here, we didn't find a valid command. 302 // If we get here, we didn't find a valid command.
334 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); 303 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
304
335next_packet: 305next_packet:
306 inbuf [pkt_len] = save_byte; // rather ugly
336 skip_packet (pkt_len); 307 skip_packet (pkt_len);
337 308
338 // input buffer has space again 309 // input buffer has space again
339 socket_ev.poll (socket_ev.poll () | PE_R); 310 socket_ev.poll (socket_ev.poll () | EV_READ);
340 311
341 return true; 312 return true;
342} 313}
343 314
344// callback called when socket is either readable or writable 315// callback called when socket is either readable or writable
345void 316void
346client::socket_cb (iow &w, int got) 317client::socket_cb (iow &w, int revents)
347{ 318{
348 //TODO remove when we have better socket cleanup logic 319 //TODO remove when we have better socket cleanup logic
349 if (destroyed ()) 320 if (destroyed ())
350 { 321 {
351 socket_ev.poll (0); 322 socket_ev.poll (0);
352 return; 323 return;
353 } 324 }
354 325
355 if (got & PE_W) 326 if (revents & EV_WRITE)
356 { 327 {
357 write_outputbuffer (); 328 write_outputbuffer ();
358 329
359 if (!outputbuffer.len) 330 if (!outputbuffer.len)
360 socket_ev.poll (socket_ev.poll () & ~PE_W); 331 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
361 } 332 }
362 333
363 if (got & PE_R) 334 if (revents & EV_READ)
364 { 335 {
365 //TODO: rate-limit tcp connection in better ways, important 336 //TODO: rate-limit tcp connection in better ways, important
366 337
367 int amount = sizeof (inbuf) - inbuf_len; 338 int amount = sizeof (inbuf) - inbuf_len;
368 339
369 if (!amount) 340 if (!amount)
370 { 341 {
371 // input buffer full 342 // input buffer full
372 socket_ev.poll (socket_ev.poll () & ~PE_R); 343 socket_ev.poll (socket_ev.poll () & ~EV_READ);
373 return; 344 return;
374 } 345 }
375 346
376 amount = read (fd, inbuf + inbuf_len, amount); 347 amount = read (fd, inbuf + inbuf_len, amount);
377 348
… …
393 } 364 }
394 else 365 else
395 { 366 {
396 inbuf_len += amount; 367 inbuf_len += amount;
397 368
398 cmd_ev.start ();
399 }
400 }
401}
402
403// called whenever we have additional commands to process
404void
405client::cmd_cb (iw &w)
406{
407 if (handle_packet ()) 369 if (handle_packet ())
408 w.start (); 370 {
409 else 371 while (handle_packet ())
410 flush (); 372 ;
373
374 flush ();
375 }
376 }
377 }
411} 378}
412 379
413/******************************************************************************* 380/*******************************************************************************
414 * 381 *
415 * Start of write related routines. 382 * Start of write related routines.
… …
471client::send_packet (packet &sl) 438client::send_packet (packet &sl)
472{ 439{
473 if (destroyed ()) 440 if (destroyed ())
474 return; 441 return;
475 442
476 if (sl.length () >= MAXSOCKBUF) 443 if (sl.length () > MAXSOCKBUF)
477 { 444 {
478 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 445 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
479 /* Almost certainly we've overflowed a buffer, so quit now to make 446 /* Almost certainly we've overflowed a buffer, so quit now to make
480 * it easier to debug. 447 * it easier to debug.
481 */ 448 */
… …
520 487
521 send_packet (sl); 488 send_packet (sl);
522} 489}
523 490
524void 491void
492client::send_msg (int color, const char *type, const char *msg)
493{
494 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
495 {
496 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
497 return;
498 }
499
500 int len = strlen (msg);
501
502 if (!(color & NDI_VERBATIM)
503 && (msg_is_special (msg)
504 || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)))
505 cfperl_send_msg (this, color, type, msg);
506 else
507 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
508}
509
510void
525client::send_drawinfo (const char *msg, int flags) 511client::send_drawinfo (const char *msg, int flags)
526{ 512{
527 send_packet_printf ("drawinfo %d %s", flags, msg); 513 send_msg (flags, "log", msg);
528}
529
530void
531client::send_msg (int color, const char *type, const char *msg)
532{
533 if (can_msg)
534 send_packet_printf ("msg %d %s %s", color, type, msg);
535 else if (color < 0)
536 return; // client cannot handle this
537 else if (strchr (msg, '<') || strchr (msg, '&'))
538 {
539 //TODO: should escape/modify to old syntax
540 send_packet_printf ("drawinfo %d %s", color, msg);
541 }
542 else
543 send_packet_printf ("drawinfo %d %s", color, msg);
544} 514}
545 515
546/*********************************************************************** 516/***********************************************************************
547 * 517 *
548 * packet functions/utilities 518 * packet functions/utilities
… …
558 *cur++ = ' '; 528 *cur++ = ' ';
559} 529}
560 530
561packet &packet::operator <<(const ber32 v) 531packet &packet::operator <<(const ber32 v)
562{ 532{
563 enum { maxlen = 32 / 7 + 1}; 533 enum { maxlen = 32 / 7 + 1 };
564 uint8 buf[maxlen]; 534 uint8 buf[maxlen];
565 uint8 *p = buf + maxlen; 535 uint8 *p = buf + maxlen;
566 uint32 val = v.val; 536 uint32 val = v.val;
567 537
568 *--p = val & 0x7F; 538 *--p = val & 0x7F;

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