github.com/dreamer-zq/go-ethereum@v1.9.7/p2p/netutil/addrutil.go (about)

     1  // Copyright 2019 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package netutil
    18  
    19  import "net"
    20  
    21  // AddrIP gets the IP address contained in addr. It returns nil if no address is present.
    22  func AddrIP(addr net.Addr) net.IP {
    23  	switch a := addr.(type) {
    24  	case *net.IPAddr:
    25  		return a.IP
    26  	case *net.TCPAddr:
    27  		return a.IP
    28  	case *net.UDPAddr:
    29  		return a.IP
    30  	default:
    31  		return nil
    32  	}
    33  }