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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 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 | { |
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54 | // check time of last ack, and, if too old, kill connection |
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55 | socklen_t len = sizeof (tcpi); |
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56 | |
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57 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
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58 | { |
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59 | if (tcpi.tcpi_snd_mss) |
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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); |
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64 | |
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65 | if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000)) |
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66 | { |
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67 | send_msg (NDI_RED | NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)"); |
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68 | write_outputbuffer (); |
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69 | |
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70 | LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
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71 | (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked); |
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72 | destroy (); |
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73 | } |
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74 | } |
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75 | } |
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76 | #endif |
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77 | |
45 | |
78 | /** |
46 | /** |
79 | * Writes data to socket. |
47 | * Writes data to socket. |
80 | * |
48 | * |
81 | * 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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383 | } |
351 | } |
384 | else |
352 | else |
385 | { |
353 | { |
386 | inbuf_len += amount; |
354 | inbuf_len += amount; |
387 | |
355 | |
388 | cmd_ev.start (); |
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389 | } |
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390 | } |
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391 | } |
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392 | |
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393 | // called whenever we have additional commands to process |
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394 | void |
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395 | client::cmd_cb (iw &w) |
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396 | { |
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397 | if (handle_packet ()) |
356 | if (handle_packet ()) |
398 | w.start (); |
357 | { |
399 | else |
358 | while (handle_packet ()) |
400 | flush (); |
359 | ; |
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360 | |
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361 | flush (); |
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362 | } |
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363 | } |
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364 | } |
401 | } |
365 | } |
402 | |
366 | |
403 | /******************************************************************************* |
367 | /******************************************************************************* |
404 | * |
368 | * |
405 | * Start of write related routines. |
369 | * Start of write related routines. |
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461 | client::send_packet (packet &sl) |
425 | client::send_packet (packet &sl) |
462 | { |
426 | { |
463 | if (destroyed ()) |
427 | if (destroyed ()) |
464 | return; |
428 | return; |
465 | |
429 | |
466 | if (sl.length () >= MAXSOCKBUF) |
430 | if (sl.length () > MAXSOCKBUF) |
467 | { |
431 | { |
468 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
432 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
469 | /* Almost certainly we've overflowed a buffer, so quit now to make |
433 | /* Almost certainly we've overflowed a buffer, so quit now to make |
470 | * it easier to debug. |
434 | * it easier to debug. |
471 | */ |
435 | */ |
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519 | } |
483 | } |
520 | |
484 | |
521 | void |
485 | void |
522 | client::send_msg (int color, const char *type, const char *msg) |
486 | client::send_msg (int color, const char *type, const char *msg) |
523 | { |
487 | { |
524 | if (msg_is_special (msg)) |
488 | if (!msg || !type) // it can happen (for example, missing attack messages cause this) |
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489 | { |
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490 | LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg); |
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491 | return; |
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492 | } |
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493 | |
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494 | int len = strlen (msg); |
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495 | |
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496 | if (msg_is_special (msg) || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)) |
525 | cfperl_send_msg (this, color, type, msg); |
497 | cfperl_send_msg (this, color, type, msg); |
526 | else if (can_msg) |
498 | else if (can_msg) |
527 | send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg); |
499 | send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg); |
528 | else if (color < 0) |
500 | else if (color < 0) |
529 | return; // client cannot handle this |
501 | return; // client cannot handle this |