static void elapse_callback(AVAHI_GCC_UNUSED AvahiTimeEvent *e, void* data) { AvahiProbeJob *pj = data, *next; AvahiProbeScheduler *s; AvahiDnsPacket *p; unsigned n; assert(pj); s = pj->scheduler; if (pj->done) { /* Lets remove it from the history */ job_free(s, pj); return; } if (!(p = avahi_dns_packet_new_query(s->interface->hardware->mtu))) return; /* OOM */ n = 1; /* Add the import probe */ if (!packet_add_probe_query(s, p, pj)) { size_t size; AvahiKey *k; int b; avahi_dns_packet_free(p); /* The probe didn't fit in the package, so let's allocate a larger one */ size = avahi_key_get_estimate_size(pj->record->key) + avahi_record_get_estimate_size(pj->record) + AVAHI_DNS_PACKET_HEADER_SIZE; if (!(p = avahi_dns_packet_new_query(size + AVAHI_DNS_PACKET_EXTRA_SIZE))) return; /* OOM */ if (!(k = avahi_key_new(pj->record->key->name, pj->record->key->clazz, AVAHI_DNS_TYPE_ANY))) { avahi_dns_packet_free(p); return; /* OOM */ } b = avahi_dns_packet_append_key(p, k, 0) && avahi_dns_packet_append_record(p, pj->record, 0, 0); avahi_key_unref(k); if (b) { avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_NSCOUNT, 1); avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_QDCOUNT, 1); avahi_interface_send_packet(s->interface, p); } else avahi_log_warn("Probe record too large, cannot send"); avahi_dns_packet_free(p); job_mark_done(s, pj); return; } /* Try to fill up packet with more probes, if available */ for (pj = s->jobs; pj; pj = pj->jobs_next) { if (pj->chosen) continue; if (!packet_add_probe_query(s, p, pj)) break; n++; } avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_QDCOUNT, n); n = 0; /* Now add the chosen records to the authorative section */ for (pj = s->jobs; pj; pj = next) { next = pj->jobs_next; if (!pj->chosen) continue; if (!avahi_dns_packet_append_record(p, pj->record, 0, 0)) { /* avahi_log_warn("Bad probe size estimate!"); */ /* Unmark all following jobs */ for (; pj; pj = pj->jobs_next) pj->chosen = 0; break; } job_mark_done(s, pj); n ++; } avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_NSCOUNT, n); /* Send it now */ avahi_interface_send_packet(s->interface, p); avahi_dns_packet_free(p); }
AvahiWideAreaLookup *avahi_wide_area_lookup_new( AvahiWideAreaLookupEngine *e, AvahiKey *key, AvahiWideAreaLookupCallback callback, void *userdata) { struct timeval tv; AvahiWideAreaLookup *l, *t; uint8_t *p; assert(e); assert(key); assert(callback); assert(userdata); l = avahi_new(AvahiWideAreaLookup, 1); l->engine = e; l->dead = 0; l->key = avahi_key_ref(key); l->cname_key = avahi_key_new_cname(l->key); l->callback = callback; l->userdata = userdata; /* If more than 65K wide area quries are issued simultaneously, * this will break. This should be limited by some higher level */ for (;; e->next_id++) if (!find_lookup(e, e->next_id)) break; /* This ID is not yet used. */ l->id = e->next_id++; /* We keep the packet around in case we need to repeat our query */ l->packet = avahi_dns_packet_new(0); avahi_dns_packet_set_field(l->packet, AVAHI_DNS_FIELD_ID, (uint16_t) l->id); avahi_dns_packet_set_field(l->packet, AVAHI_DNS_FIELD_FLAGS, AVAHI_DNS_FLAGS(0, 0, 0, 0, 1, 0, 0, 0, 0, 0)); p = avahi_dns_packet_append_key(l->packet, key, 0); assert(p); avahi_dns_packet_set_field(l->packet, AVAHI_DNS_FIELD_QDCOUNT, 1); if (send_to_dns_server(l, l->packet) < 0) { avahi_log_error(__FILE__": Failed to send packet."); avahi_dns_packet_free(l->packet); avahi_key_unref(l->key); if (l->cname_key) avahi_key_unref(l->cname_key); avahi_free(l); return NULL; } l->n_send = 1; l->time_event = avahi_time_event_new(e->server->time_event_queue, avahi_elapse_time(&tv, 500, 0), sender_timeout_callback, l); avahi_hashmap_insert(e->lookups_by_id, &l->id, l); t = avahi_hashmap_lookup(e->lookups_by_key, l->key); AVAHI_LLIST_PREPEND(AvahiWideAreaLookup, by_key, t, l); avahi_hashmap_replace(e->lookups_by_key, avahi_key_ref(l->key), t); AVAHI_LLIST_PREPEND(AvahiWideAreaLookup, lookups, e->lookups, l); return l; }