87 lines
1.7 KiB
Go
87 lines
1.7 KiB
Go
// Copyright 2011 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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// MAC address manipulations
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package net
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import "errors"
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const hexDigit = "0123456789abcdef"
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// A HardwareAddr represents a physical hardware address.
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type HardwareAddr []byte
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func (a HardwareAddr) String() string {
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if len(a) == 0 {
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return ""
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}
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buf := make([]byte, 0, len(a)*3-1)
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for i, b := range a {
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if i > 0 {
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buf = append(buf, ':')
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}
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buf = append(buf, hexDigit[b>>4])
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buf = append(buf, hexDigit[b&0xF])
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}
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return string(buf)
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}
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// ParseMAC parses s as an IEEE 802 MAC-48, EUI-48, or EUI-64 using one of the
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// following formats:
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// 01:23:45:67:89:ab
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// 01:23:45:67:89:ab:cd:ef
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// 01-23-45-67-89-ab
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// 01-23-45-67-89-ab-cd-ef
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// 0123.4567.89ab
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// 0123.4567.89ab.cdef
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func ParseMAC(s string) (hw HardwareAddr, err error) {
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if len(s) < 14 {
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goto error
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}
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if s[2] == ':' || s[2] == '-' {
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if (len(s)+1)%3 != 0 {
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goto error
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}
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n := (len(s) + 1) / 3
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if n != 6 && n != 8 {
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goto error
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}
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hw = make(HardwareAddr, n)
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for x, i := 0, 0; i < n; i++ {
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var ok bool
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if hw[i], ok = xtoi2(s[x:], s[2]); !ok {
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goto error
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}
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x += 3
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}
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} else if s[4] == '.' {
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if (len(s)+1)%5 != 0 {
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goto error
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}
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n := 2 * (len(s) + 1) / 5
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if n != 6 && n != 8 {
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goto error
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}
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hw = make(HardwareAddr, n)
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for x, i := 0, 0; i < n; i += 2 {
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var ok bool
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if hw[i], ok = xtoi2(s[x:x+2], 0); !ok {
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goto error
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}
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if hw[i+1], ok = xtoi2(s[x+2:], s[4]); !ok {
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goto error
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}
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x += 5
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}
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} else {
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goto error
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}
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return hw, nil
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error:
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return nil, errors.New("invalid MAC address: " + s)
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}
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