bionic (3) dns_ip4.3.gz

NAME

       dns_ip4 - look up IPv4 addresses

SYNTAX

       #include <dns.h>

       int dns_ip4(stralloc* out,stralloc* fqdn);

DESCRIPTION

       dns_ip4  looks  up  4-byte  IP  addresses  for  the  fully-qualified  domain  name  in  fqdn. It puts the
       concatenation of the IP addresses into out and returns 0. If the domain does not exist in DNS, or has  no
       IP addresses, out will be empty.

       If  dns_ip4  has  trouble  with  the  DNS  lookup  or  runs  out  of memory, it returns -1, setting errno
       appropriately. It may or may not change out.

       If fqdn is a dotted-decimal IP address, dns_ip4 puts that IP address into out without checking DNS.  More
       generally,  if  fqdn  is  a  dot-separated sequence of dotted-decimal IP addresses, dns_ip4 puts those IP
       addresses into out without checking DNS. Brackets may appear inside the dotted-decimal IP addresses; they
       are ignored.

SEE ALSO

       dns_ip4_packet(3), dns_ip6(3), dns_name4(3)

                                                                                                      dns_ip4(3)