1dns_ip6(3)                 Library Functions Manual                 dns_ip6(3)
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NAME

6       dns_ip6 - look up IPv6 addresses
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SYNTAX

9       #include <dns.h>
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11       int dns_ip6(stralloc* out,stralloc* fqdn);
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DESCRIPTION

14       dns_ip6  looks up 16-byte IPv6 addresses for the fully-qualified domain
15       name in fqdn. It puts the concatenation of the IPv6 addresses into  out
16       and  returns  0.  If  the  domain  does  not exist in DNS, or has no IP
17       addresses, out will be empty.
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19       dns_ip6 also looks up 4-byte IPv4  addresses  and  converts  them  into
20       IPv4-mapped  IPv6  addresses (::ffff:1.2.3.4) to provide easy backwards
21       compatibility for IPv6 applications.
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23       If dns_ip6 has trouble with the DNS lookup or runs out  of  memory,  it
24       returns -1, setting errno appropriately. It may or may not change out.
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26       If fqdn is an IPv6 address, dns_ip6 puts that IP address into out with‐
27       out checking DNS.  IPv4 addresses are also used  directly  without  DNS
28       lookup.
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SEE ALSO

31       dns_ip6_packet(3), dns_ip4(3), dns_name6(3)
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35                                                                    dns_ip6(3)
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