BOOL queue_dns_query(struct packet_struct *p,struct nmb_name *question)
{
struct name_record *namerec = NULL;
struct in_addr dns_ip;
unstring qname;
pull_ascii_nstring(qname, sizeof(qname), question->name);
DEBUG(3,("DNS search for %s - ", nmb_namestr(question)));
/* Unblock TERM signal so we can be killed in DNS lookup. */
BlockSignals(False, SIGTERM);
dns_ip.s_addr = interpret_addr(qname);
/* Re-block TERM signal. */
BlockSignals(True, SIGTERM);
namerec = add_dns_result(question, dns_ip);
if(namerec == NULL) {
send_wins_name_query_response(NAM_ERR, p, NULL);
} else {
send_wins_name_query_response(0, p, namerec);
}
return False;
}
/***************************************************************************
we use this when we can't do async DNS lookups
****************************************************************************/
BOOL queue_dns_query(struct packet_struct *p,struct nmb_name *question,
struct name_record **n)
{
char *qname = question->name;
struct in_addr dns_ip;
DEBUG(3,("DNS search for %s - ", nmb_namestr(question)));
/* Unblock TERM signal so we can be killed in DNS lookup. */
BlockSignals(False, SIGTERM);
dns_ip.s_addr = interpret_addr(qname);
/* Re-block TERM signal. */
BlockSignals(True, SIGTERM);
*n = add_dns_result(question, dns_ip);
if(*n == NULL)
send_wins_name_query_response(NAM_ERR, p, NULL);
else
send_wins_name_query_response(0, p, *n);
return False;
}
/***************************************************************************
check the DNS queue
****************************************************************************/
void run_dns_queue(void)
{
struct query_record r;
struct packet_struct *p, *p2;
struct name_record *namerec;
int size;
if (fd_in == -1)
return;
/* Allow SIGTERM to kill us. */
BlockSignals(False, SIGTERM);
if (!process_exists(child_pid)) {
close(fd_in);
start_async_dns();
}
if ((size=read_data(fd_in, (char *)&r, sizeof(r))) != sizeof(r)) {
if (size) {
DEBUG(0,("Incomplete DNS answer from child!\n"));
fd_in = -1;
}
BlockSignals(True, SIGTERM);
return;
}
BlockSignals(True, SIGTERM);
namerec = add_dns_result(&r.name, r.result);
if (dns_current) {
if (query_current(&r)) {
DEBUG(3,("DNS calling send_wins_name_query_response\n"));
in_dns = 1;
if(namerec == NULL)
send_wins_name_query_response(NAM_ERR, dns_current, NULL);
else
send_wins_name_query_response(0,dns_current,namerec);
in_dns = 0;
}
dns_current->locked = False;
free_packet(dns_current);
dns_current = NULL;
}
/* loop over the whole dns queue looking for entries that
match the result we just got */
for (p = dns_queue; p;) {
struct nmb_packet *nmb = &p->packet.nmb;
struct nmb_name *question = &nmb->question.question_name;
if (nmb_name_equal(question, &r.name)) {
DEBUG(3,("DNS calling send_wins_name_query_response\n"));
in_dns = 1;
if(namerec == NULL)
send_wins_name_query_response(NAM_ERR, p, NULL);
else
send_wins_name_query_response(0,p,namerec);
in_dns = 0;
p->locked = False;
if (p->prev)
p->prev->next = p->next;
else
dns_queue = p->next;
if (p->next)
p->next->prev = p->prev;
p2 = p->next;
free_packet(p);
p = p2;
} else {
p = p->next;
}
}
if (dns_queue) {
dns_current = dns_queue;
dns_queue = dns_queue->next;
if (dns_queue) dns_queue->prev = NULL;
dns_current->next = NULL;
if (!write_child(dns_current)) {
DEBUG(3,("failed to send DNS query to child!\n"));
return;
}
}
}