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 |
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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 | /** |
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25 | * \file |
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26 | * Low-level socket-related functions. |
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27 | * |
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28 | * \date 2003-12-02 |
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29 | * |
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30 | * Contains some base functions that both the client and server |
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31 | * can use. As such, depending what we are being compiled for will |
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32 | * determine what we can include. the client is designed have |
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33 | * CFCLIENT defined as part of its compile flags. |
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34 | */ |
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35 | |
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36 | using namespace std; |
23 | using 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 |
… | |
… | |
57 | client::flush () |
44 | client::flush () |
58 | { |
45 | { |
59 | if (destroyed ()) |
46 | if (destroyed ()) |
60 | return; |
47 | return; |
61 | |
48 | |
62 | #ifdef __linux__ //TODO: this is available on bsds, too, use a configure test. |
49 | #if HAVE_TCP_INFO |
63 | // check about once per second, spread evenly over all clients |
50 | // check about once per second, spread evenly over all clients |
64 | if (!((pticks + fd) & 7)) |
51 | // do this only when player is active |
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52 | if (!((pticks + fd) & 7) && pl && pl->active) |
65 | { |
53 | { |
66 | // check time of last ack, and, if too old, kill connection |
54 | // check time of last ack, and, if too old, kill connection |
67 | struct tcp_info tcpi; |
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68 | socklen_t len = sizeof (tcpi); |
55 | socklen_t len = sizeof (tcpi); |
69 | |
56 | |
70 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
57 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
71 | { |
58 | { |
72 | rtt = tcpi.tcpi_rtt; |
59 | if (tcpi.tcpi_snd_mss) |
73 | rttvar = tcpi.tcpi_rttvar; |
60 | mss = tcpi.tcpi_snd_mss; |
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61 | |
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62 | //fprintf (stderr, "uack %d sst %d cwnd %d mss %d pmtu %d\n", |
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63 | // tcpi.tcpi_unacked, tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu); |
74 | |
64 | |
75 | if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000)) |
65 | if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000)) |
76 | { |
66 | { |
77 | send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)"); |
67 | send_msg (NDI_RED | NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)"); |
78 | write_outputbuffer (); |
68 | write_outputbuffer (); |
79 | |
69 | |
80 | LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
70 | 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); |
71 | (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked); |
82 | destroy (); |
72 | destroy (); |
… | |
… | |
93 | */ |
83 | */ |
94 | |
84 | |
95 | // write a nop to the socket at least every IDLE_NOP seconds. |
85 | // write a nop to the socket at least every IDLE_NOP seconds. |
96 | if (!outputbuffer.len) |
86 | if (!outputbuffer.len) |
97 | { |
87 | { |
98 | if (last_send + IDLE_PING <= NOW) |
88 | if (last_send + IDLE_PING <= NOW && pl && pl->active) |
99 | { |
89 | { |
100 | // this is a bit ugly, but map1/map1a seem to be the only |
90 | // this is a bit ugly, but map1/map1a seem to be the only |
101 | // nop'able commands and they are quite small. |
91 | // nop'able commands and they are quite small. |
102 | packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
92 | packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
103 | send_packet (sl); |
93 | send_packet (sl); |
… | |
… | |
174 | if (inbuf_len >= 2 + pkt_len) |
164 | if (inbuf_len >= 2 + pkt_len) |
175 | return 2 + pkt_len; |
165 | return 2 + pkt_len; |
176 | |
166 | |
177 | if (inbuf_len == sizeof (inbuf)) |
167 | if (inbuf_len == sizeof (inbuf)) |
178 | { |
168 | { |
179 | send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED); |
169 | send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY); |
180 | destroy (); |
170 | destroy (); |
181 | return -1; |
171 | return -1; |
182 | } |
172 | } |
183 | } |
173 | } |
184 | |
174 | |
… | |
… | |
278 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
268 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
279 | else |
269 | else |
280 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
270 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
281 | } |
271 | } |
282 | else |
272 | else |
283 | send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); |
273 | send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name); |
284 | } |
274 | } |
285 | |
275 | |
286 | bool |
276 | bool |
287 | client::handle_packet () |
277 | client::handle_packet () |
288 | { |
278 | { |
… | |
… | |
329 | |
319 | |
330 | goto next_packet; |
320 | goto next_packet; |
331 | } |
321 | } |
332 | |
322 | |
333 | // If we get here, we didn't find a valid command. |
323 | // 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); |
324 | send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2); |
335 | next_packet: |
325 | next_packet: |
336 | skip_packet (pkt_len); |
326 | skip_packet (pkt_len); |
337 | |
327 | |
338 | // input buffer has space again |
328 | // input buffer has space again |
339 | socket_ev.poll (socket_ev.poll () | PE_R); |
329 | socket_ev.poll (socket_ev.poll () | PE_R); |
… | |
… | |
519 | va_end (ap); |
509 | va_end (ap); |
520 | |
510 | |
521 | send_packet (sl); |
511 | send_packet (sl); |
522 | } |
512 | } |
523 | |
513 | |
524 | void |
514 | // returns true when the message needs special (read: perl) treatment |
525 | client::send_drawinfo (const char *msg, int flags) |
515 | static bool |
526 | { |
516 | msg_is_special (const char *msg) |
527 | send_packet_printf ("drawinfo %d %s", flags, msg); |
517 | { |
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518 | return msg [strcspn (msg, "<[&\n")]; |
528 | } |
519 | } |
529 | |
520 | |
530 | void |
521 | void |
531 | client::send_msg (int color, const char *type, const char *msg) |
522 | client::send_msg (int color, const char *type, const char *msg) |
532 | { |
523 | { |
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524 | if (msg_is_special (msg)) |
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525 | cfperl_send_msg (this, color, type, msg); |
533 | if (can_msg) |
526 | else if (can_msg) |
534 | send_packet_printf ("msg %d %s %s", color, type, msg); |
527 | send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg); |
535 | else if (color < 0) |
528 | else if (color < 0) |
536 | return; // client cannot handle this |
529 | return; // client cannot handle this |
537 | else if (strchr (msg, '<') || strchr (msg, '&')) |
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538 | { |
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539 | //TODO: should escape/modify to old syntax |
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540 | send_packet_printf ("drawinfo %d %s", color, msg); |
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541 | } |
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542 | else |
530 | else |
543 | send_packet_printf ("drawinfo %d %s", color, msg); |
531 | send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg); |
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532 | } |
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533 | |
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534 | void |
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535 | client::send_drawinfo (const char *msg, int flags) |
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536 | { |
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537 | send_msg (flags, "log", msg); |
544 | } |
538 | } |
545 | |
539 | |
546 | /*********************************************************************** |
540 | /*********************************************************************** |
547 | * |
541 | * |
548 | * packet functions/utilities |
542 | * packet functions/utilities |