void
idnsALookup(const char *name, IDNSCB * callback, void *data)
{
unsigned int i;
int nd = 0;
idns_query *q;
if (idnsCachedLookup(name, callback, data))
return;
q = cbdataAlloc(idns_query);
q->tcp_socket = -1;
q->id = idnsQueryID();
for (i = 0; i < strlen(name); i++)
{
if (name[i] == '.')
{
nd++;
}
}
if (Config.onoff.res_defnames && npc > 0 && name[strlen(name) - 1] != '.')
{
q->do_searchpath = 1;
}
else
{
q->do_searchpath = 0;
}
strcpy(q->orig, name);
strcpy(q->name, q->orig);
if (q->do_searchpath && nd < ndots)
{
q->domain = 0;
strcat(q->name, ".");
strcat(q->name, searchpath[q->domain].domain);
debug(78, 3) ("idnsALookup: searchpath used for %s\n",
q->name);
}
q->sz = rfc1035BuildAQuery(q->name, q->buf, sizeof(q->buf), q->id,
&q->query);
if (q->sz < 0)
{
/* problem with query data -- query not sent */
callback(data, NULL, 0, "Internal error");
cbdataFree(q);
return;
}
debug(78, 3) ("idnsALookup: buf is %d bytes for %s, id = %#hx\n",
(int) q->sz, q->name, q->id);
q->callback = callback;
q->callback_data = data;
cbdataLock(q->callback_data);
q->start_t = current_time;
idnsCacheQuery(q);
idnsSendQuery(q);
}
void
idnsALookup(const char *name, IDNSCB * callback, void *data)
{
idns_query *q = memAllocate(MEM_IDNS_QUERY);
q->sz = sizeof(q->buf);
q->id = rfc1035BuildAQuery(name, q->buf, &q->sz);
debug(78, 3) ("idnsALookup: buf is %d bytes for %s, id = %#hx\n",
(int) q->sz, name, q->id);
q->callback = callback;
q->callback_data = data;
cbdataLock(q->callback_data);
q->start_t = current_time;
idnsSendQuery(q);
}
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);
}
