p2p/netutil/addrutil.go


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// Copyright 2016 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
    }
}