helper.go

Documentation: golang.org/x/net/ipv6

     1  // Copyright 2013 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package ipv6
     6  
     7  import (
     8  	"errors"
     9  	"net"
    10  	"runtime"
    11  )
    12  
    13  var (
    14  	errInvalidConn     = errors.New("invalid connection")
    15  	errMissingAddress  = errors.New("missing address")
    16  	errHeaderTooShort  = errors.New("header too short")
    17  	errInvalidConnType = errors.New("invalid conn type")
    18  	errNotImplemented  = errors.New("not implemented on " + runtime.GOOS + "/" + runtime.GOARCH)
    19  )
    20  
    21  func boolint(b bool) int {
    22  	if b {
    23  		return 1
    24  	}
    25  	return 0
    26  }
    27  
    28  func netAddrToIP16(a net.Addr) net.IP {
    29  	switch v := a.(type) {
    30  	case *net.UDPAddr:
    31  		if ip := v.IP.To16(); ip != nil && ip.To4() == nil {
    32  			return ip
    33  		}
    34  	case *net.IPAddr:
    35  		if ip := v.IP.To16(); ip != nil && ip.To4() == nil {
    36  			return ip
    37  		}
    38  	}
    39  	return nil
    40  }
    41  
    42  func opAddr(a net.Addr) net.Addr {
    43  	switch a.(type) {
    44  	case *net.TCPAddr:
    45  		if a == nil {
    46  			return nil
    47  		}
    48  	case *net.UDPAddr:
    49  		if a == nil {
    50  			return nil
    51  		}
    52  	case *net.IPAddr:
    53  		if a == nil {
    54  			return nil
    55  		}
    56  	}
    57  	return a
    58  }
    59
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