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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.43 by root, Sat Jun 9 22:54:04 2007 UTC vs.
Revision 1.60 by root, Mon Oct 1 01:09:10 2007 UTC

1/* 1/*
2 * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game. 2 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
3 * 3 *
4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team 4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT 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 * Crossfire TRT 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 <crossfire@schmorp.de>
22 */ 21 */
23 22
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 */
35
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__
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);
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
278 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); 236 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
279 else 237 else
280 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); 238 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
281 } 239 }
282 else 240 else
283 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); 241 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
284} 242}
285 243
286bool 244bool
287client::handle_packet () 245client::handle_packet ()
288{ 246{
329 287
330 goto next_packet; 288 goto next_packet;
331 } 289 }
332 290
333 // If we get here, we didn't find a valid command. 291 // 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); 292 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
335next_packet: 293next_packet:
336 skip_packet (pkt_len); 294 skip_packet (pkt_len);
337 295
338 // input buffer has space again 296 // input buffer has space again
339 socket_ev.poll (socket_ev.poll () | PE_R); 297 socket_ev.poll (socket_ev.poll () | PE_R);
393 } 351 }
394 else 352 else
395 { 353 {
396 inbuf_len += amount; 354 inbuf_len += amount;
397 355
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 ()) 356 if (handle_packet ())
408 w.start (); 357 {
409 else 358 while (handle_packet ())
410 flush (); 359 ;
360
361 flush ();
362 }
363 }
364 }
411} 365}
412 366
413/******************************************************************************* 367/*******************************************************************************
414 * 368 *
415 * Start of write related routines. 369 * Start of write related routines.
471client::send_packet (packet &sl) 425client::send_packet (packet &sl)
472{ 426{
473 if (destroyed ()) 427 if (destroyed ())
474 return; 428 return;
475 429
476 if (sl.length () >= MAXSOCKBUF) 430 if (sl.length () > MAXSOCKBUF)
477 { 431 {
478 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 432 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 433 /* Almost certainly we've overflowed a buffer, so quit now to make
480 * it easier to debug. 434 * it easier to debug.
481 */ 435 */
519 va_end (ap); 473 va_end (ap);
520 474
521 send_packet (sl); 475 send_packet (sl);
522} 476}
523 477
524void 478// returns true when the message needs special (read: perl) treatment
525client::send_drawinfo (const char *msg, int flags) 479static bool
526{ 480msg_is_special (const char *msg)
527 send_packet_printf ("drawinfo %d %s", flags, msg); 481{
482 return msg [strcspn (msg, "<[&\n")];
528} 483}
529 484
530void 485void
531client::send_msg (int color, const char *type, const char *msg) 486client::send_msg (int color, const char *type, const char *msg)
532{ 487{
488 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
489 {
490 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
491 return;
492 }
493
494 int len = strlen (msg);
495
496 if (msg_is_special (msg) || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128))
497 cfperl_send_msg (this, color, type, msg);
533 if (can_msg) 498 else if (can_msg)
534 send_packet_printf ("msg %d %s %s", color, type, msg); 499 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
535 else if (color < 0) 500 else if (color < 0)
536 return; // client cannot handle this 501 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 502 else
543 send_packet_printf ("drawinfo %d %s", color, msg); 503 send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
504}
505
506void
507client::send_drawinfo (const char *msg, int flags)
508{
509 send_msg (flags, "log", msg);
544} 510}
545 511
546/*********************************************************************** 512/***********************************************************************
547 * 513 *
548 * packet functions/utilities 514 * packet functions/utilities

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