static int on_llmnr_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
DnsTransaction *t = NULL;
Manager *m = userdata;
DnsScope *scope;
int r;
r = manager_recv(m, fd, DNS_PROTOCOL_LLMNR, &p);
if (r <= 0)
return r;
scope = manager_find_scope(m, p);
if (!scope) {
log_warning("Got LLMNR UDP packet on unknown scope. Ignoring.");
return 0;
}
if (dns_packet_validate_reply(p) > 0) {
log_debug("Got LLMNR reply packet for id %u", DNS_PACKET_ID(p));
dns_scope_check_conflicts(scope, p);
t = hashmap_get(m->dns_transactions, UINT_TO_PTR(DNS_PACKET_ID(p)));
if (t)
dns_transaction_process_reply(t, p);
} else if (dns_packet_validate_query(p) > 0) {
log_debug("Got LLMNR query packet for id %u", DNS_PACKET_ID(p));
dns_scope_process_query(scope, NULL, p);
} else
log_debug("Invalid LLMNR UDP packet.");
return 0;
}
static int on_dns_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
DnsTransaction *t = userdata;
int r;
assert(t);
assert(t->scope);
r = manager_recv(t->scope->manager, fd, DNS_PROTOCOL_DNS, &p);
if (r <= 0)
return r;
if (dns_packet_validate_reply(p) > 0 &&
DNS_PACKET_ID(p) == t->id)
dns_transaction_process_reply(t, p);
else
log_debug("Invalid DNS packet.");
return 0;
}
static int on_stream_complete(DnsStream *s, int error) {
_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
DnsTransaction *t;
assert(s);
assert(s->transaction);
/* Copy the data we care about out of the stream before we
* destroy it. */
t = s->transaction;
p = dns_packet_ref(s->read_packet);
t->stream = dns_stream_free(t->stream);
if (error != 0) {
dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES);
return 0;
}
if (dns_packet_validate_reply(p) <= 0) {
log_debug("Invalid LLMNR TCP packet.");
dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY);
return 0;
}
dns_scope_check_conflicts(t->scope, p);
t->block_gc++;
dns_transaction_process_reply(t, p);
t->block_gc--;
/* If the response wasn't useful, then complete the transition now */
if (t->state == DNS_TRANSACTION_PENDING)
dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY);
return 0;
}