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31 | # include <sys/socket.h> |
31 | # include <sys/socket.h> |
32 | # include <netinet/in.h> |
32 | # include <netinet/in.h> |
33 | # include <netinet/tcp.h> |
33 | # include <netinet/tcp.h> |
34 | #endif |
34 | #endif |
35 | |
35 | |
36 | // disconnect a socket after this many seconds without an ack |
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37 | #define SOCKET_TIMEOUT 8. |
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38 | |
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39 | // force a packet when idle for more than this many seconds, |
36 | // force a packet when idle for more than this many seconds, |
40 | // forcing an ack regularly. |
37 | // forcing an ack regularly. |
41 | #define IDLE_PING 2. |
38 | #define IDLE_PING 2. |
42 | |
39 | |
43 | void |
40 | void |
44 | client::flush () |
41 | client::flush () |
45 | { |
42 | { |
46 | if (destroyed ()) |
43 | if (destroyed ()) |
47 | return; |
44 | return; |
48 | |
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49 | #if HAVE_TCP_INFO |
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50 | // check time of last ack, and, if too old, kill connection |
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51 | socklen_t len = sizeof (tcpi); |
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52 | |
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53 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
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54 | { |
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55 | if (tcpi.tcpi_snd_mss) |
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56 | mss = tcpi.tcpi_snd_mss; |
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57 | |
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58 | #if 0 |
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59 | fprintf (stderr, "uack %d ack %d lost %d ret %d fack %d sst %d cwnd %d mss %d pmtu %d advmss %d EXC %d\n", |
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60 | tcpi.tcpi_unacked, |
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61 | tcpi.tcpi_sacked, |
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62 | tcpi.tcpi_lost, |
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63 | tcpi.tcpi_retrans, |
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64 | tcpi.tcpi_fackets, |
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65 | tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu, tcpi.tcpi_advmss, |
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66 | |
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67 | tcpi.tcpi_snd_cwnd - (tcpi.tcpi_unacked - tcpi.tcpi_sacked)); |
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68 | #endif |
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69 | |
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70 | // do this only when player is active |
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71 | if (pl && pl->active |
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72 | && tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000)) |
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73 | { |
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74 | send_msg (NDI_RED | NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)"); |
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75 | write_outputbuffer (); |
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76 | |
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77 | LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
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78 | (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked); |
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79 | destroy (); |
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80 | } |
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81 | } |
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82 | #endif |
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83 | |
45 | |
84 | /** |
46 | /** |
85 | * Writes data to socket. |
47 | * Writes data to socket. |
86 | * |
48 | * |
87 | * 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 |
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467 | client::send_packet (packet &sl) |
429 | client::send_packet (packet &sl) |
468 | { |
430 | { |
469 | if (destroyed ()) |
431 | if (destroyed ()) |
470 | return; |
432 | return; |
471 | |
433 | |
472 | if (sl.length () >= MAXSOCKBUF) |
434 | if (sl.length () > MAXSOCKBUF) |
473 | { |
435 | { |
474 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
436 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
475 | /* Almost certainly we've overflowed a buffer, so quit now to make |
437 | /* Almost certainly we've overflowed a buffer, so quit now to make |
476 | * it easier to debug. |
438 | * it easier to debug. |
477 | */ |
439 | */ |