Man page - dns_ip6(3)

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Manual

dns_ip6

NAME
SYNTAX
DESCRIPTION
SEE ALSO

NAME

dns_ip6 - look up IPv6 addresses

SYNTAX

#include <libowfat/dns.h>

int dns_ip6 (stralloc* out ,stralloc* fqdn );

DESCRIPTION

dns_ip6 looks up 16-byte IPv6 addresses for the fully-qualified domain name in fqdn . It puts the concatenation of the IPv6 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 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 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 an IPv6 address, dns_ip6 puts that IP address into out without checking DNS. IPv4 addresses are also used directly without DNS lookup.

SEE ALSO

dns_ip6_packet(3), dns_ip4(3), dns_name6(3)