github.com/aigarnetwork/aigar@v0.0.0-20191115204914-d59a6eb70f8e/p2p/netutil/addrutil.go (about)

     1  //  Copyright 2018 The go-ethereum Authors
     2  //  Copyright 2019 The go-aigar Authors
     3  //  This file is part of the go-aigar library.
     4  //
     5  //  The go-aigar library is free software: you can redistribute it and/or modify
     6  //  it under the terms of the GNU Lesser General Public License as published by
     7  //  the Free Software Foundation, either version 3 of the License, or
     8  //  (at your option) any later version.
     9  //
    10  //  The go-aigar library is distributed in the hope that it will be useful,
    11  //  but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  //  GNU Lesser General Public License for more details.
    14  //
    15  //  You should have received a copy of the GNU Lesser General Public License
    16  //  along with the go-aigar library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package netutil
    19  
    20  import "net"
    21  
    22  // AddrIP gets the IP address contained in addr. It returns nil if no address is present.
    23  func AddrIP(addr net.Addr) net.IP {
    24  	switch a := addr.(type) {
    25  	case *net.IPAddr:
    26  		return a.IP
    27  	case *net.TCPAddr:
    28  		return a.IP
    29  	case *net.UDPAddr:
    30  		return a.IP
    31  	default:
    32  		return nil
    33  	}
    34  }