go-ethereum/p2p/netutil/addrutil.go

// Copyright 2019 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package netutil

import "net"

// AddrIP gets the IP address contained in addr. It returns nil if no address is present.
func AddrIP(addr net.Addr) net.IP {
	switch a := addr.(type) {
	case *net.IPAddr:
		return a.IP
	case *net.TCPAddr:
		return a.IP
	case *net.UDPAddr:
		return a.IP
	default:
		return nil
	}
}