netutil

func CheckRelayIP ¶

func CheckRelayIP(sender, addr net.IP) error

CheckRelayIP reports whether an IP relayed from the given sender IP is a valid connection target.

There are four rules:

• Special network addresses are never valid.
• Loopback addresses are OK if relayed by a loopback host.
• LAN addresses are OK if relayed by a LAN host.
• All other addresses are always acceptable.

func IsLAN ¶

func IsLAN(ip net.IP) bool

IsLAN reports whether an IP is a local network address.

func IsSpecialNetwork ¶

func IsSpecialNetwork(ip net.IP) bool

IsSpecialNetwork reports whether an IP is located in a special-use network range This includes broadcast, multicast and documentation addresses.

func IsTemporaryError ¶

func IsTemporaryError(err error) bool

IsTemporaryError checks whether the given error should be considered temporary.