announce.c

  1 /*
  2  * Copyright (C) 2014 John Crispin <blogic@openwrt.org>
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU Lesser General Public License version 2.1
  6  * as published by the Free Software Foundation
  7  *
  8  * This program is distributed in the hope that it will be useful,
  9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 11  * GNU General Public License for more details.
 12  */
 13 
 14 #include <sys/types.h>
 15 
 16 #include <stdio.h>
 17 
 18 #include <libubox/uloop.h>
 19 
 20 #include "cache.h"
 21 #include "dns.h"
 22 #include "util.h"
 23 #include "service.h"
 24 #include "announce.h"
 25 #include "interface.h"
 26 
 27 #define TTL_TIMEOUT     75
 28 
 29 enum {
 30         STATE_PROBE1 = 0,
 31         STATE_PROBE2,
 32         STATE_PROBE3,
 33         STATE_PROBE_WAIT,
 34         STATE_PROBE_END,
 35         STATE_ANNOUNCE,
 36 };
 37 
 38 int announce_ttl = 75 * 60;
 39 
 40 static void
 41 announce_timer(struct uloop_timeout *timeout)
 42 {
 43         struct interface *iface = container_of(timeout, struct interface, announce_timer);
 44 
 45         switch (iface->announce_state) {
 46                 case STATE_PROBE1:
 47                 case STATE_PROBE2:
 48                 case STATE_PROBE3:
 49                         dns_send_question(iface, NULL, mdns_hostname_local, TYPE_ANY, 1);
 50                         uloop_timeout_set(timeout, 250);
 51                         iface->announce_state++;
 52                         break;
 53 
 54                 case STATE_PROBE_WAIT:
 55                         uloop_timeout_set(timeout, 500);
 56                         iface->announce_state++;
 57                         break;
 58 
 59                 case STATE_PROBE_END:
 60                         if (cache_host_is_known(mdns_hostname_local)) {
 61                                 fprintf(stderr, "the host %s already exists. stopping announce service\n", mdns_hostname_local);
 62                                 return;
 63                         }
 64                         iface->announce_state++;
 65                         /* Fall through */
 66 
 67                 case STATE_ANNOUNCE:
 68                         dns_reply_a(iface, NULL, announce_ttl, NULL);
 69                         dns_reply_a_additional(iface, NULL, announce_ttl);
 70                         service_announce_services(iface, NULL, announce_ttl);
 71                         uloop_timeout_set(timeout, announce_ttl * 800);
 72                         break;
 73         }
 74 }
 75 
 76 void
 77 announce_init(struct interface *iface)
 78 {
 79         iface->announce_state = STATE_PROBE1;
 80         iface->announce_timer.cb = announce_timer;
 81         uloop_timeout_set(&iface->announce_timer, 100);
 82 }
 83 
 84 void
 85 announce_free(struct interface *iface)
 86 {
 87         uloop_timeout_cancel(&iface->announce_timer);
 88 }
 89
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Sources/mdnsd/announce.c
