59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package ipv4
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"errors"
|
|
"net"
|
|
"unsafe"
|
|
)
|
|
|
|
var (
|
|
errMissingAddress = errors.New("missing address")
|
|
errMissingHeader = errors.New("missing header")
|
|
errHeaderTooShort = errors.New("header too short")
|
|
errBufferTooShort = errors.New("buffer too short")
|
|
errInvalidConnType = errors.New("invalid conn type")
|
|
errOpNoSupport = errors.New("operation not supported")
|
|
errNoSuchInterface = errors.New("no such interface")
|
|
errNoSuchMulticastInterface = errors.New("no such multicast interface")
|
|
|
|
// See http://www.freebsd.org/doc/en/books/porters-handbook/freebsd-versions.html.
|
|
freebsdVersion uint32
|
|
|
|
nativeEndian binary.ByteOrder
|
|
)
|
|
|
|
func init() {
|
|
i := uint32(1)
|
|
b := (*[4]byte)(unsafe.Pointer(&i))
|
|
if b[0] == 1 {
|
|
nativeEndian = binary.LittleEndian
|
|
} else {
|
|
nativeEndian = binary.BigEndian
|
|
}
|
|
}
|
|
|
|
func boolint(b bool) int {
|
|
if b {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func netAddrToIP4(a net.Addr) net.IP {
|
|
switch v := a.(type) {
|
|
case *net.UDPAddr:
|
|
if ip := v.IP.To4(); ip != nil {
|
|
return ip
|
|
}
|
|
case *net.IPAddr:
|
|
if ip := v.IP.To4(); ip != nil {
|
|
return ip
|
|
}
|
|
}
|
|
return nil
|
|
}
|