/* void dns_readable(int fd, void *ptr)
* Input: An fd which has become readable, ptr not used.
* Output: None.
* Side effects: Read DNS responses from DNS servers.
* Note: Called by the fd system.
*/
void
dns_readable(int fd, void *ptr)
{
adns_processreadable(dns_state, fd, &SystemTime);
dns_do_callbacks();
dns_select();
}
/* void delete_adns_queries(struct DNSQuery *q)
* Input: A pointer to the applicable DNSQuery structure.
* Output: None
* Side effects: Cancels a DNS query.
*/
void
delete_adns_queries(struct DNSQuery *q)
{
if(q != NULL && q->query != NULL)
{
adns_cancel(q->query);
q->callback = NULL;
}
dns_select();
}
/* int adns_gethost(const char *name, int aftype, struct DNSQuery *req);
* Input: A name, an address family, a DNSQuery structure.
* Output: None
* Side effects: Sets up a query structure and sends off a DNS query to
* the DNS server to resolve an "A"(address) entry by name.
*/
int
adns_gethost(const char *name, int aftype, struct DNSQuery *req)
{
int result;
assert(dns_state->nservers > 0);
#ifdef IPV6
if(aftype == AF_INET6)
result = adns_submit(dns_state, name, adns_r_addr6, adns_qf_owner, req, &req->query);
else
#endif
result = adns_submit(dns_state, name, adns_r_addr, adns_qf_owner, req, &req->query);
dns_select();
return result;
}
/* void init_resolver(void)
* Input: None
* Output: None
* Side effects: Reads the ADNS configuration and sets up the ADNS server
* polling and query timeouts.
*/
void init_resolver(void)
{
int r;
r = adns_init(&dns_state, adns_if_noautosys, 0);
if(dns_state == NULL)
{
ilog(L_CRIT, "Error opening /etc/resolv.conf: %s; r = %d", strerror(errno), r);
exit(76);
}
eventAddIsh("timeout_adns", timeout_adns, NULL, 2);
dns_select();
}
/* int adns_getaddr(struct irc_inaddr *addr, int aftype,
* struct DNSQuery *req, int arpa_type);
* Input: An address, an address family, a DNSQuery structure.
* Output: None
* Side effects: Sets up a query entry and sends it to the DNS server to
* resolve an IP address to a domain name.
*/
int
adns_getaddr(struct sockaddr *addr, int aftype, struct DNSQuery *req)
{
int result;
int flags = adns_r_ptr;
assert(dns_state->nservers > 0);
#ifdef IPV6
if(addr->sa_family == AF_INET6)
flags = adns_r_ptr_ip6;
#endif
result = adns_submit_reverse(dns_state,
(struct sockaddr *) addr,
flags,
adns_qf_owner | adns_qf_cname_loose |
adns_qf_quoteok_anshost, req, &req->query);
dns_select();
return result;
}
