man dns_name6 () - look up host name
NAME
dns_name6 - look up host name
SYNTAX
#include <dns.h>
int dns_name6(stralloc* out,const char* ip[16]);
DESCRIPTION
dns_name6 looks up the domain name for the 16-byte IPv6 address in ip. It puts the (first) domain name into out and returns 0. If the relevant ip6.int domain does not exist in DNS, or has no PTR records, out will be empty.
dns_name6 will try both the new "ip6.arpa" reverse lookup domain and the old (deprecated) "ip6.int" one.
If dns_name6 has trouble with the DNS lookup or runs out of memory, it returns -1, setting errno appropriately. It may or may not change out.
SEE ALSO
dns_name_packet(3), dns_name6_domain(3), dns_name4(3), dns_ip6(3)