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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__ |
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); |
