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