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19 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
20 | * |
20 | * |
21 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
21 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
22 | */ |
22 | */ |
23 | |
23 | |
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; |
24 | using namespace std; |
37 | |
25 | |
38 | #include <global.h> |
26 | #include <global.h> |
39 | #include <sproto.h> |
27 | #include <sproto.h> |
40 | #include <cstdarg> |
28 | #include <cstdarg> |
41 | |
29 | |
42 | #ifdef __linux__ |
30 | #if HAVE_TCP_INFO |
43 | # include <sys/types.h> |
31 | # include <sys/types.h> |
44 | # include <sys/socket.h> |
32 | # include <sys/socket.h> |
45 | # include <netinet/in.h> |
33 | # include <netinet/in.h> |
46 | # include <netinet/tcp.h> |
34 | # include <netinet/tcp.h> |
47 | #endif |
35 | #endif |
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57 | client::flush () |
45 | client::flush () |
58 | { |
46 | { |
59 | if (destroyed ()) |
47 | if (destroyed ()) |
60 | return; |
48 | return; |
61 | |
49 | |
62 | #ifdef __linux__ //TODO: this is available on bsds, too, use a configure test. |
50 | #if HAVE_TCP_INFO |
63 | // check about once per second, spread evenly over all clients |
51 | // check about once per second, spread evenly over all clients |
64 | if (!((pticks + fd) & 7)) |
52 | // do this only when player is active |
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53 | if (!((pticks + fd) & 7) && pl && pl->active) |
65 | { |
54 | { |
66 | // check time of last ack, and, if too old, kill connection |
55 | // check time of last ack, and, if too old, kill connection |
67 | struct tcp_info tcpi; |
56 | struct tcp_info tcpi; |
68 | socklen_t len = sizeof (tcpi); |
57 | socklen_t len = sizeof (tcpi); |
69 | |
58 | |
70 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
59 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
71 | { |
60 | { |
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61 | if (tcpi.tcpi_snd_mss) |
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62 | mss = tcpi.tcpi_snd_mss; |
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63 | |
72 | rtt = tcpi.tcpi_rtt; |
64 | rtt = tcpi.tcpi_rtt; |
73 | rttvar = tcpi.tcpi_rttvar; |
65 | rttvar = tcpi.tcpi_rttvar; |
74 | |
66 | |
75 | if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000)) |
67 | if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000)) |
76 | { |
68 | { |
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93 | */ |
85 | */ |
94 | |
86 | |
95 | // write a nop to the socket at least every IDLE_NOP seconds. |
87 | // write a nop to the socket at least every IDLE_NOP seconds. |
96 | if (!outputbuffer.len) |
88 | if (!outputbuffer.len) |
97 | { |
89 | { |
98 | if (last_send + IDLE_PING <= NOW) |
90 | if (last_send + IDLE_PING <= NOW && pl && pl->active) |
99 | { |
91 | { |
100 | // this is a bit ugly, but map1/map1a seem to be the only |
92 | // this is a bit ugly, but map1/map1a seem to be the only |
101 | // nop'able commands and they are quite small. |
93 | // nop'able commands and they are quite small. |
102 | packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
94 | packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
103 | send_packet (sl); |
95 | send_packet (sl); |