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27 lines
1.1 KiB
Groff
27 lines
1.1 KiB
Groff
23 years ago
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.TH dns_ip6_qualify 3
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.SH NAME
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dns_ip6_qualify \- qualify name and look up IPv6 addresses
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.SH SYNTAX
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.B #include <dns.h>
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int \fBdns_ip6_qualify\fP(stralloc* \fIout\fR,stralloc* \fIfqdn\fR,
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const stralloc* \fIudn\fR);
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.SH DESCRIPTION
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dns_ip6_qualify feeds the name \fIudn\fR through qualification and looks up
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16-byte IPv6 addresses for the result. It puts the fully qualified domain name
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into \fIfqdn\fR, puts the concatenation of the IP addresses into \fIout\fR, and
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returns 0. If the domain does not exist in DNS, or has no IP addresses,
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\fIout\fR will be empty.
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dns_ip6_qualify also looks up 4-byte IPv4 addresses and converts them
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into IPv4-mapped IPv6 addresses (::ffff:1.2.3.4) to provide easy
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backwards compatibility for IPv6 applications.
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If dns_ip6_qualify has trouble with the qualification, has trouble with DNS, or
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runs out of memory, it returns -1, setting errno appropriately. It may or may
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not change \fIout\fR and \fIfqdn\fR.
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.SH QUALIFICATION
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See http://cr.yp.to/djbdns/qualification.html
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.SH "SEE ALSO"
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dns_ip6(3), dns_ip6_packet(3), dns_ip4_qualify(3)
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