dns_ip6 man page on Alpinelinux

dns_ip6 man page on Alpinelinux

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dns_ip6(3)							    dns_ip6(3)

NAME
       dns_ip6 - look up IPv6 addresses

SYNTAX
       #include <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 with‐
       out checking DNS.  IPv4 addresses are also used	directly  without  DNS
       lookup.

SEE ALSO
       dns_ip6_packet(3), dns_ip4(3), dns_name6(3)

								    dns_ip6(3)

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