LookupIP with a host, return ip.

LookupIPv4 with a host, return ipv4 list.

LookupIPv4WithResolver same as LookupIPv4, but with a resolver.

LookupIPv6 with a host, return ipv6 list.

LookupIPv6WithResolver same as LookupIPv6, but with a resolver.

LookupIPWithResolver same as LookupIP, but with a resolver.

RelayDnsPacket will truncate udp message up to SafeDnsPacketSize.

ResolveIP with a host, return ip and priority return TypeA.

ResolveIPv4 with a host, return ipv4.

ResolveIPv4WithResolver same as ResolveIPv4, but with a resolver.

ResolveIPv6WithResolver same as ResolveIPv6, but with a resolver.

ResolveIPWithResolver same as ResolveIP, but with a resolver.

ServeMsg with a dns.Msg, return resolve dns.Msg.

safe size which is 1232 from https://dnsflagday.net/2020/, so 2048 is enough.

DefaultDNSTimeout defined the default dns request timeout.

DefaultHosts aim to resolve hosts.

DefaultResolver aim to resolve ip.

DirectHostResolver resolve ip for direct outbound host, only nil when DefaultResolver is nil.

DisableIPv6 means don't resolve ipv6 host default value is true.

ProxyServerHostResolver resolve ip for proxies server host, only nil when DefaultResolver is nil.

SystemResolver always using system dns, and was init in dns module.