You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
|
|
|
|
.TH dns_ip6 3
|
|
|
|
|
.SH NAME
|
|
|
|
|
dns_ip6 \- look up IPv6 addresses
|
|
|
|
|
.SH SYNTAX
|
|
|
|
|
.B #include <libowfat/dns.h>
|
|
|
|
|
|
|
|
|
|
int \fBdns_ip6\fP(stralloc* \fIout\fR,stralloc* \fIfqdn\fR);
|
|
|
|
|
.SH DESCRIPTION
|
|
|
|
|
dns_ip6 looks up 16-byte IPv6 addresses for the fully-qualified domain name in
|
|
|
|
|
\fIfqdn\fR. It puts the concatenation of the IPv6 addresses into \fIout\fR and
|
|
|
|
|
returns 0. If the domain does not exist in DNS, or has no IP addresses,
|
|
|
|
|
\fIout\fR 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 \fIout\fR.
|
|
|
|
|
|
|
|
|
|
If \fIfqdn\fR is an IPv6 address, dns_ip6 puts that IP address into
|
|
|
|
|
\fIout\fR without checking DNS. IPv4 addresses are also used directly
|
|
|
|
|
without DNS lookup.
|
|
|
|
|
.SH "SEE ALSO"
|
|
|
|
|
dns_ip6_packet(3), dns_ip4(3), dns_name6(3)
|
