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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 1.65 by root, Thu May 8 20:03:50 2008 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 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 * Copyright (©) 1992,2007 Frank Tore Johansen 5 * Copyright (©) 1992,2007 Frank Tore Johansen
6 * 6 *
7 * Crossfire TRT is free software; you can redistribute it and/or modify it 7 * Deliantra is free software: you can redistribute it and/or modify
8 * under the terms of the GNU General Public License as published by the Free 8 * it under the terms of the GNU General Public License as published by
9 * Software Foundation; either version 2 of the License, or (at your option) 9 * the Free Software Foundation, either version 3 of the License, or
10 * any later version. 10 * (at your option) any later version.
11 * 11 *
12 * This program is distributed in the hope that it will be useful, but 12 * This program is distributed in the hope that it will be useful,
13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * for more details. 15 * GNU General Public License for more details.
16 * 16 *
17 * You should have received a copy of the GNU General Public License along 17 * You should have received a copy of the GNU General Public License
18 * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51 18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 map1/map1a seem to be the only
101 // nop'able commands and they are quite small. 59 // nop'able commands and they are quite small.
102 packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); 60 packet sl (mapmode == Map1Cmd ? "map1" : "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
… …
258 { 216 {
259 data += 6; 217 data += 6;
260 len -= 6; 218 len -= 6;
261 } 219 }
262 220
263 if (len > 4 && !strncmp (data, "say " , 4)) 221 if (len > 4 && data [3] == ' ' && !strncmp (data, "say " , 4)) return true;
264 return true; 222 if (len > 5 && data [4] == ' ' && !strncmp (data, "chat " , 5)) return true;
265 if (len > 5 && !strncmp (data, "chat ", 5)) 223 if (len > 6 && data [5] == ' ' && !strncmp (data, "shout ", 6)) return true;
266 return true; 224
225 if (len == 7 && !strcmp (data, "suicide")) return true;
267 226
268 return false; 227 return false;
269} 228}
270 229
271void 230void
… …
278 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 237 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
279 else 238 else
280 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 239 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
281 } 240 }
282 else 241 else
283 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); 242 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
284} 243}
285 244
286bool 245bool
287client::handle_packet () 246client::handle_packet ()
288{ 247{
… …
329 288
330 goto next_packet; 289 goto next_packet;
331 } 290 }
332 291
333 // If we get here, we didn't find a valid command. 292 // 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); 293 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
335next_packet: 294next_packet:
336 skip_packet (pkt_len); 295 skip_packet (pkt_len);
337 296
338 // input buffer has space again 297 // input buffer has space again
339 socket_ev.poll (socket_ev.poll () | PE_R); 298 socket_ev.poll (socket_ev.poll () | EV_READ);
340 299
341 return true; 300 return true;
342} 301}
343 302
344// callback called when socket is either readable or writable 303// callback called when socket is either readable or writable
345void 304void
346client::socket_cb (iow &w, int got) 305client::socket_cb (iow &w, int revents)
347{ 306{
348 //TODO remove when we have better socket cleanup logic 307 //TODO remove when we have better socket cleanup logic
349 if (destroyed ()) 308 if (destroyed ())
350 { 309 {
351 socket_ev.poll (0); 310 socket_ev.poll (0);
352 return; 311 return;
353 } 312 }
354 313
355 if (got & PE_W) 314 if (revents & EV_WRITE)
356 { 315 {
357 write_outputbuffer (); 316 write_outputbuffer ();
358 317
359 if (!outputbuffer.len) 318 if (!outputbuffer.len)
360 socket_ev.poll (socket_ev.poll () & ~PE_W); 319 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
361 } 320 }
362 321
363 if (got & PE_R) 322 if (revents & EV_READ)
364 { 323 {
365 //TODO: rate-limit tcp connection in better ways, important 324 //TODO: rate-limit tcp connection in better ways, important
366 325
367 int amount = sizeof (inbuf) - inbuf_len; 326 int amount = sizeof (inbuf) - inbuf_len;
368 327
369 if (!amount) 328 if (!amount)
370 { 329 {
371 // input buffer full 330 // input buffer full
372 socket_ev.poll (socket_ev.poll () & ~PE_R); 331 socket_ev.poll (socket_ev.poll () & ~EV_READ);
373 return; 332 return;
374 } 333 }
375 334
376 amount = read (fd, inbuf + inbuf_len, amount); 335 amount = read (fd, inbuf + inbuf_len, amount);
377 336
… …
393 } 352 }
394 else 353 else
395 { 354 {
396 inbuf_len += amount; 355 inbuf_len += amount;
397 356
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 ()) 357 if (handle_packet ())
408 w.start (); 358 {
409 else 359 while (handle_packet ())
410 flush (); 360 ;
361
362 flush ();
363 }
364 }
365 }
411} 366}
412 367
413/******************************************************************************* 368/*******************************************************************************
414 * 369 *
415 * Start of write related routines. 370 * Start of write related routines.
… …
471client::send_packet (packet &sl) 426client::send_packet (packet &sl)
472{ 427{
473 if (destroyed ()) 428 if (destroyed ())
474 return; 429 return;
475 430
476 if (sl.length () >= MAXSOCKBUF) 431 if (sl.length () > MAXSOCKBUF)
477 { 432 {
478 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 433 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 434 /* Almost certainly we've overflowed a buffer, so quit now to make
480 * it easier to debug. 435 * it easier to debug.
481 */ 436 */
… …
520 475
521 send_packet (sl); 476 send_packet (sl);
522} 477}
523 478
524void 479void
525client::send_drawinfo (const char *msg, int flags)
526{
527 send_packet_printf ("drawinfo %d %s", flags, msg);
528}
529
530void
531client::send_msg (int color, const char *type, const char *msg) 480client::send_msg (int color, const char *type, const char *msg)
532{ 481{
482 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
483 {
484 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
485 return;
486 }
487
488 int len = strlen (msg);
489
490 if (msg_is_special (msg) || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128))
491 cfperl_send_msg (this, color, type, msg);
533 if (can_msg) 492 else if (can_msg)
534 send_packet_printf ("msg %d %s %s", color, type, msg); 493 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
535 else if (color < 0) 494 else if (color < 0)
536 return; // client cannot handle this 495 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 496 else
543 send_packet_printf ("drawinfo %d %s", color, msg); 497 send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
498}
499
500void
501client::send_drawinfo (const char *msg, int flags)
502{
503 send_msg (flags, "log", msg);
544} 504}
545 505
546/*********************************************************************** 506/***********************************************************************
547 * 507 *
548 * packet functions/utilities 508 * packet functions/utilities

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