dns_ip6_packet man page
dns_ip6_packet — extract IPv6 address from DNS answer packet
int dns_ip6_packet(stralloc* out,const char* buf,
unsigned int len);
dns_ip6_packet is a low-level component of dns_ip6, designed to support asynchronous DNS lookups. It reads a DNS packet of length len from buf, extracts IPv4 and IPv6 addresses from the answer section of the packet, puts the addresses into out, and returns 0 or -1 the same way as dns_ip6.
dns_ip4_packet(3), dns_ip6(3), dns_ip6_qualify(3).