mirror of
https://github.com/golang/go
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net: move MAC address parser into distinct file
R=golang-dev, bradfitz CC=golang-dev https://golang.org/cl/5727054
This commit is contained in:
Mikio Hara
parent
54875a7a7f
commit
4d35583661
@ -6,11 +6,7 @@
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package net
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import (
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"bytes"
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"errors"
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"fmt"
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)
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import "errors"
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var (
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errInvalidInterface = errors.New("net: invalid interface")
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@ -20,77 +16,6 @@ var (
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errNoSuchMulticastInterface = errors.New("net: no such multicast interface")
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)
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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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var buf bytes.Buffer
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for i, b := range a {
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if i > 0 {
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buf.WriteByte(':')
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}
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fmt.Fprintf(&buf, "%02x", b)
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}
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return buf.String()
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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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// Interface represents a mapping between network interface name
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// and index. It also represents network interface facility
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// information.
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@ -6,8 +6,6 @@ package net
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import (
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"bytes"
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"reflect"
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"strings"
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"testing"
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)
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@ -96,46 +94,3 @@ func testMulticastAddrs(t *testing.T, ifmat []Addr) {
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}
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}
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}
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var mactests = []struct {
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in string
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out HardwareAddr
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err string
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}{
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{"01:23:45:67:89:AB", HardwareAddr{1, 0x23, 0x45, 0x67, 0x89, 0xab}, ""},
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{"01-23-45-67-89-AB", HardwareAddr{1, 0x23, 0x45, 0x67, 0x89, 0xab}, ""},
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{"0123.4567.89AB", HardwareAddr{1, 0x23, 0x45, 0x67, 0x89, 0xab}, ""},
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{"ab:cd:ef:AB:CD:EF", HardwareAddr{0xab, 0xcd, 0xef, 0xab, 0xcd, 0xef}, ""},
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{"01.02.03.04.05.06", nil, "invalid MAC address"},
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{"01:02:03:04:05:06:", nil, "invalid MAC address"},
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{"x1:02:03:04:05:06", nil, "invalid MAC address"},
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{"01002:03:04:05:06", nil, "invalid MAC address"},
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{"01:02003:04:05:06", nil, "invalid MAC address"},
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{"01:02:03004:05:06", nil, "invalid MAC address"},
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{"01:02:03:04005:06", nil, "invalid MAC address"},
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{"01:02:03:04:05006", nil, "invalid MAC address"},
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{"01-02:03:04:05:06", nil, "invalid MAC address"},
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{"01:02-03-04-05-06", nil, "invalid MAC address"},
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{"0123:4567:89AF", nil, "invalid MAC address"},
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{"0123-4567-89AF", nil, "invalid MAC address"},
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{"01:23:45:67:89:AB:CD:EF", HardwareAddr{1, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef}, ""},
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{"01-23-45-67-89-AB-CD-EF", HardwareAddr{1, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef}, ""},
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{"0123.4567.89AB.CDEF", HardwareAddr{1, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef}, ""},
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}
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func match(err error, s string) bool {
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if s == "" {
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return err == nil
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}
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return err != nil && strings.Contains(err.Error(), s)
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}
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func TestParseMAC(t *testing.T) {
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for _, tt := range mactests {
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out, err := ParseMAC(tt.in)
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if !reflect.DeepEqual(out, tt.out) || !match(err, tt.err) {
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t.Errorf("ParseMAC(%q) = %v, %v, want %v, %v", tt.in, out, err, tt.out,
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tt.err)
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}
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}
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}
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84
src/pkg/net/mac.go
Normal file
84
src/pkg/net/mac.go
Normal file
@ -0,0 +1,84 @@
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// 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 (
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"bytes"
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"errors"
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"fmt"
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)
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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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var buf bytes.Buffer
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for i, b := range a {
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if i > 0 {
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buf.WriteByte(':')
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}
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fmt.Fprintf(&buf, "%02x", b)
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}
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return buf.String()
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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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54
src/pkg/net/mac_test.go
Normal file
54
src/pkg/net/mac_test.go
Normal file
@ -0,0 +1,54 @@
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// 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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package net
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import (
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"reflect"
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"strings"
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"testing"
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)
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var mactests = []struct {
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in string
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out HardwareAddr
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err string
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}{
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{"01:23:45:67:89:AB", HardwareAddr{1, 0x23, 0x45, 0x67, 0x89, 0xab}, ""},
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{"01-23-45-67-89-AB", HardwareAddr{1, 0x23, 0x45, 0x67, 0x89, 0xab}, ""},
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{"0123.4567.89AB", HardwareAddr{1, 0x23, 0x45, 0x67, 0x89, 0xab}, ""},
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{"ab:cd:ef:AB:CD:EF", HardwareAddr{0xab, 0xcd, 0xef, 0xab, 0xcd, 0xef}, ""},
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{"01.02.03.04.05.06", nil, "invalid MAC address"},
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{"01:02:03:04:05:06:", nil, "invalid MAC address"},
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{"x1:02:03:04:05:06", nil, "invalid MAC address"},
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{"01002:03:04:05:06", nil, "invalid MAC address"},
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{"01:02003:04:05:06", nil, "invalid MAC address"},
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{"01:02:03004:05:06", nil, "invalid MAC address"},
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{"01:02:03:04005:06", nil, "invalid MAC address"},
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{"01:02:03:04:05006", nil, "invalid MAC address"},
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{"01-02:03:04:05:06", nil, "invalid MAC address"},
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{"01:02-03-04-05-06", nil, "invalid MAC address"},
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{"0123:4567:89AF", nil, "invalid MAC address"},
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{"0123-4567-89AF", nil, "invalid MAC address"},
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{"01:23:45:67:89:AB:CD:EF", HardwareAddr{1, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef}, ""},
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{"01-23-45-67-89-AB-CD-EF", HardwareAddr{1, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef}, ""},
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{"0123.4567.89AB.CDEF", HardwareAddr{1, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef}, ""},
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}
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func match(err error, s string) bool {
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if s == "" {
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return err == nil
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}
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return err != nil && strings.Contains(err.Error(), s)
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}
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func TestParseMAC(t *testing.T) {
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for _, tt := range mactests {
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out, err := ParseMAC(tt.in)
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if !reflect.DeepEqual(out, tt.out) || !match(err, tt.err) {
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t.Errorf("ParseMAC(%q) = %v, %v, want %v, %v", tt.in, out, err, tt.out,
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tt.err)
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}
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}
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}
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