jammy (3) dns_ip6_qualify.3.gz

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 appropriately. 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)