dns_ip6_qualify(3) Library Functions Manual dns_ip6_qualify(3)
NAME
dns_ip6_qualify - qualify name and look up IPv6 addresses
SYNTAX
#include <dns.h>
int dns_ip6_qualify(stralloc* out,stralloc* fqdn,
const stralloc* udn);
DESCRIPTION
dns_ip6_qualify feeds the name udn through qualification and looks up 16-byte IPv6 addresses for the result. It puts the fully qualified
domain name into fqdn, 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.
dns_ip6_qualify also looks up 4-byte IPv4 addresses and converts them into IPv4-mapped IPv6 addresses (::ffff:1.2.3.4) to provide easy
backwards compatibility for IPv6 applications.
If dns_ip6_qualify has trouble with the qualification, has trouble with DNS, or runs out of memory, it returns -1, setting errno appropri-
ately. It may or may not change out and fqdn.
QUALIFICATION
See http://cr.yp.to/djbdns/qualification.html
SEE ALSO
dns_ip6(3), dns_ip6_packet(3), dns_ip4_qualify(3)
dns_ip6_qualify(3)
