mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-26 16:11:07 +00:00
64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
/*
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* Copyright (c)2019 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2023-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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/****/
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package zerotier
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import (
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"encoding/json"
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"fmt"
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"strconv"
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"strings"
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)
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// MAC represents an Ethernet hardware address
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type MAC uint64
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// NewMACFromString decodes a MAC address in canonical colon-separated hex format
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func NewMACFromString(s string) (MAC, error) {
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ss := strings.Split(s, ":")
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if len(ss) != 6 {
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return MAC(0), ErrInvalidMACAddress
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}
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var m uint64
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for i := 0; i < 6; i++ {
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m <<= 8
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c, _ := strconv.ParseUint(ss[i], 16, 64)
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if c > 0xff {
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return MAC(0), ErrInvalidMACAddress
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}
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m |= (c & 0xff)
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}
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return MAC(m), nil
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}
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// String returns this MAC address in canonical human-readable form
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func (m MAC) String() string {
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return fmt.Sprintf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", (uint64(m)>>40)&0xff, (uint64(m)>>32)&0xff, (uint64(m)>>24)&0xff, (uint64(m)>>16)&0xff, (uint64(m)>>8)&0xff, uint64(m)&0xff)
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}
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// MarshalJSON marshals this MAC as a string
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func (m MAC) MarshalJSON() ([]byte, error) {
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return []byte("\"" + m.String() + "\""), nil
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}
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// UnmarshalJSON unmarshals this MAC from a string
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func (m *MAC) UnmarshalJSON(j []byte) error {
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var s string
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err := json.Unmarshal(j, &s)
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if err != nil {
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return err
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}
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*m, err = NewMACFromString(s)
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return err
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}
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