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 |
48 | |
35 | |
49 | // use a really low timeout, as it doesn't cost any bandwidth, and you can |
36 | // disconnect a socket after this many seconds without an ack |
50 | // easily die in 20 seconds... |
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51 | #define SOCKET_TIMEOUT1 10 * 1000 |
37 | #define SOCKET_TIMEOUT 8. |
52 | #define SOCKET_TIMEOUT2 20 * 1000 |
38 | |
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39 | // force a packet when idle for more than this many seconds, |
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40 | // forcing an ack regularly. |
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41 | #define IDLE_PING 2. |
53 | |
42 | |
54 | void |
43 | void |
55 | client::flush () |
44 | client::flush () |
56 | { |
45 | { |
57 | if (destroyed ()) |
46 | if (destroyed ()) |
58 | return; |
47 | return; |
59 | |
48 | |
60 | #ifdef __linux__ |
49 | #if HAVE_TCP_INFO |
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50 | // check about once per second, spread evenly over all clients |
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51 | // do this only when player is active |
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52 | if (!((pticks + fd) & 7) && pl && pl->active) |
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53 | { |
61 | // check time of last ack, and, if too old, kill connection |
54 | // check time of last ack, and, if too old, kill connection |
62 | struct tcp_info tcpi; |
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63 | socklen_t len = sizeof (tcpi); |
55 | socklen_t len = sizeof (tcpi); |
64 | |
56 | |
65 | 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)) |
66 | { |
58 | { |
67 | unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; |
59 | if (tcpi.tcpi_snd_mss) |
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60 | mss = tcpi.tcpi_snd_mss; |
68 | |
61 | |
69 | rtt = tcpi.tcpi_rtt; |
62 | fprintf (stderr, "uack %d sst %d cwnd %d mss %d pmtu %d\n", |
70 | rttvar = tcpi.tcpi_rttvar; |
63 | tcpi.tcpi_unacked, tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu); |
71 | |
64 | |
72 | if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s |
65 | if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000)) |
73 | && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s |
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74 | { |
66 | { |
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67 | send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)"); |
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68 | write_outputbuffer (); |
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69 | |
75 | 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, |
76 | (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); |
77 | destroy (); |
72 | destroy (); |
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73 | } |
78 | } |
74 | } |
79 | } |
75 | } |
80 | #endif |
76 | #endif |
81 | |
77 | |
82 | /** |
78 | /** |
… | |
… | |
84 | * |
80 | * |
85 | * When the socket is clear to write, and we have backlogged data, this |
81 | * When the socket is clear to write, and we have backlogged data, this |
86 | * is called to write it out. |
82 | * is called to write it out. |
87 | */ |
83 | */ |
88 | |
84 | |
89 | if (!outputbuffer.len || socket_ev.poll () & PE_W) |
85 | // write a nop to the socket at least every IDLE_NOP seconds. |
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86 | if (!outputbuffer.len) |
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87 | { |
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88 | if (last_send + IDLE_PING <= NOW && pl && pl->active) |
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89 | { |
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90 | // this is a bit ugly, but map1/map1a seem to be the only |
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91 | // nop'able commands and they are quite small. |
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92 | packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
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93 | send_packet (sl); |
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94 | } |
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95 | else |
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96 | return; |
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97 | } |
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98 | |
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99 | if (socket_ev.poll () & PE_W) |
90 | return; |
100 | return; |
91 | |
101 | |
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102 | last_send = NOW; |
92 | write_outputbuffer (); |
103 | write_outputbuffer (); |
93 | } |
104 | } |
94 | |
105 | |
95 | void |
106 | void |
96 | client::write_outputbuffer () |
107 | client::write_outputbuffer () |
… | |
… | |
106 | /* wrap back to start of buffer */ |
117 | /* wrap back to start of buffer */ |
107 | if (outputbuffer.start == SOCKETBUFSIZE) |
118 | if (outputbuffer.start == SOCKETBUFSIZE) |
108 | outputbuffer.start = 0; |
119 | outputbuffer.start = 0; |
109 | |
120 | |
110 | outputbuffer.len -= res; |
121 | outputbuffer.len -= res; |
111 | #ifdef CS_LOGSTATS |
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112 | cst_tot.obytes += res; |
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113 | cst_lst.obytes += res; |
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114 | #endif |
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115 | } |
122 | } |
116 | else if (res == 0) |
123 | else if (res == 0) |
117 | { |
124 | { |
118 | LOG (llevError, "socket write failed, connection closed.\n"); |
125 | LOG (llevError, "socket write failed, connection closed.\n"); |
119 | destroy (); |
126 | destroy (); |
… | |
… | |
376 | } |
383 | } |
377 | else |
384 | else |
378 | { |
385 | { |
379 | inbuf_len += amount; |
386 | inbuf_len += amount; |
380 | |
387 | |
381 | cst_tot.ibytes += amount; |
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382 | cst_lst.ibytes += amount; |
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383 | |
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384 | cmd_ev.start (); |
388 | cmd_ev.start (); |
385 | } |
389 | } |
386 | } |
390 | } |
387 | } |
391 | } |
388 | |
392 | |
… | |
… | |
505 | va_end (ap); |
509 | va_end (ap); |
506 | |
510 | |
507 | send_packet (sl); |
511 | send_packet (sl); |
508 | } |
512 | } |
509 | |
513 | |
510 | void |
514 | // returns true when the message needs special (read: perl) treatment |
511 | client::send_drawinfo (const char *msg, int flags) |
515 | static bool |
512 | { |
516 | msg_is_special (const char *msg) |
513 | send_packet_printf ("drawinfo %d %s", flags, msg); |
517 | { |
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518 | return msg [strcspn (msg, "<[&\n")]; |
514 | } |
519 | } |
515 | |
520 | |
516 | void |
521 | void |
517 | client::send_msg (int color, const char *type, const char *msg) |
522 | client::send_msg (int color, const char *type, const char *msg) |
518 | { |
523 | { |
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524 | if (msg_is_special (msg)) |
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525 | cfperl_send_msg (this, color, type, msg); |
519 | if (can_msg) |
526 | else if (can_msg) |
520 | send_packet_printf ("msg %d %s %s", color, type, msg); |
527 | send_packet_printf ("msg %d %s %s", color, type, msg); |
521 | else if (color < 0) |
528 | else if (color < 0) |
522 | return; // client cannot handle this |
529 | return; // client cannot handle this |
523 | else if (strchr (msg, '<') || strchr (msg, '&')) |
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524 | { |
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525 | //TODO: should escape/modify to old syntax |
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526 | send_packet_printf ("drawinfo %d %s", color, msg); |
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527 | } |
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528 | else |
530 | else |
529 | send_packet_printf ("drawinfo %d %s", color, msg); |
531 | send_packet_printf ("drawinfo %d %s", color, 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); |
530 | } |
538 | } |
531 | |
539 | |
532 | /*********************************************************************** |
540 | /*********************************************************************** |
533 | * |
541 | * |
534 | * packet functions/utilities |
542 | * packet functions/utilities |
… | |
… | |
606 | return reset (); |
614 | return reset (); |
607 | |
615 | |
608 | cur += len; |
616 | cur += len; |
609 | } |
617 | } |
610 | |
618 | |
611 | /****************************************************************************** |
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612 | * |
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613 | * statistics logging functions. |
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614 | * |
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615 | ******************************************************************************/ |
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616 | |
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617 | #ifdef CS_LOGSTATS |
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618 | |
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619 | /* cst_tot is for the life of the server, cst_last is for the last series of |
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620 | * stats |
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621 | */ |
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622 | CS_Stats cst_tot, cst_lst; |
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623 | |
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624 | /** |
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625 | * Writes out the gathered stats. We clear cst_lst. |
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626 | */ |
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627 | void |
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628 | write_cs_stats (void) |
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629 | { |
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630 | time_t now = time (NULL); |
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631 | |
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632 | /* If no connections recently, don't both to log anything */ |
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633 | if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
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634 | return; |
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635 | |
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636 | /* CSSTAT is put in so scripts can easily find the line */ |
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637 | LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
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638 | ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
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639 | now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
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640 | cst_lst.ibytes = 0; |
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641 | cst_lst.obytes = 0; |
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642 | cst_lst.time_start = now; |
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643 | } |
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644 | #endif |
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645 | |
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