static void
idnsCheckQueue(void *unused)
{
dlink_node *n;
dlink_node *p = NULL;
idns_query *q;
event_queued = 0;
if (0 == nns)
/* name servers went away; reconfiguring or shutting down */
return;
for (n = lru_list.tail; n; n = p)
{
p = n->prev;
q = n->data;
/* Anything to process in the queue? */
if (tvSubDsec(q->queue_t, current_time) < Config.Timeout.idns_retransmit)
break;
/* Query timer expired? */
if (tvSubDsec(q->sent_t, current_time) < Config.Timeout.idns_retransmit * 1 << ((q->nsends - 1) / nns))
{
dlinkDelete(&q->lru, &lru_list);
q->queue_t = current_time;
dlinkAdd(q, &q->lru, &lru_list);
continue;
}
debug(78, 3) ("idnsCheckQueue: ID %#04x timeout\n",
q->id);
dlinkDelete(&q->lru, &lru_list);
if (tvSubDsec(q->start_t, current_time) < Config.Timeout.idns_query)
{
idnsSendQuery(q);
}
else
{
debug(78, 2) ("idnsCheckQueue: ID %x: giving up after %d tries and %5.1f seconds\n",
(int) q->id, q->nsends,
tvSubDsec(q->start_t, current_time));
if (q->rcode != 0)
idnsCallback(q, NULL, -q->rcode, q->error);
else
idnsCallback(q, NULL, -16, "Timeout");
idnsTcpCleanup(q);
cbdataFree(q);
}
}
idnsTickleQueue();
}
static void
idnsGrokReply(const char *buf, size_t sz)
{
int n;
rfc1035_message *message = NULL;
idns_query *q;
n = rfc1035MessageUnpack(buf,
sz,
&message);
if (message == NULL) {
debug(78, 2) ("idnsGrokReply: Malformed DNS response\n");
return;
}
debug(78, 3) ("idnsGrokReply: ID %#hx, %d answers\n", message->id, n);
q = idnsFindQuery(message->id);
if (q == NULL) {
debug(78, 3) ("idnsGrokReply: Late response\n");
rfc1035MessageDestroy(message);
return;
}
if (rfc1035QueryCompare(&q->query, message->query) != 0) {
debug(78, 3) ("idnsGrokReply: Query mismatch (%s != %s)\n", q->query.name, message->query->name);
rfc1035MessageDestroy(message);
return;
}
dlinkDelete(&q->lru, &lru_list);
if (message->tc && q->tcp_socket == -1) {
debug(78, 2) ("idnsGrokReply: Response for %s truncated. Retrying using TCP\n", message->query->name);
rfc1035MessageDestroy(message);
idnsRetryTcp(q);
return;
}
idnsRcodeCount(n, q->attempt);
q->error = NULL;
if (n < 0) {
debug(78, 3) ("idnsGrokReply: error %s (%d)\n", rfc1035_error_message, rfc1035_errno);
q->error = rfc1035_error_message;
q->rcode = -n;
if (q->rcode == 2 && ++q->attempt < MAX_ATTEMPT) {
/*
* RCODE 2 is "Server failure - The name server was
* unable to process this query due to a problem with
* the name server."
*/
rfc1035MessageDestroy(message);
q->start_t = current_time;
q->id = idnsQueryID();
rfc1035SetQueryID(q->buf, q->id);
idnsSendQuery(q);
return;
}
if (q->rcode == 3 && q->do_searchpath && q->attempt < MAX_ATTEMPT) {
strcpy(q->name, q->orig);
if (q->domain < npc) {
strcat(q->name, ".");
strcat(q->name, searchpath[q->domain].domain);
debug(78, 3) ("idnsGrokReply: searchpath used for %s\n",
q->name);
q->domain++;
} else {
q->attempt++;
}
rfc1035MessageDestroy(message);
if (q->hash.key) {
hash_remove_link(idns_lookup_hash, &q->hash);
q->hash.key = NULL;
}
q->start_t = current_time;
q->id = idnsQueryID();
rfc1035SetQueryID(q->buf, q->id);
q->sz = rfc1035BuildAQuery(q->name, q->buf, sizeof(q->buf), q->id,
&q->query);
idnsCacheQuery(q);
idnsSendQuery(q);
return;
}
}
idnsCallback(q, message->answer, n, q->error);
rfc1035MessageDestroy(message);
idnsTcpCleanup(q);
cbdataFree(q);
}