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This commit is contained in:
Adam Ierymenko 2019-09-22 22:25:55 -07:00
commit 536bc59abb
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5 changed files with 390 additions and 55 deletions
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30
go/pkg/zerotier/mac.go
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@ -41,6 +41,36 @@ func NewMACFromString(s string) (MAC, error) {
return MAC(m), nil
}
// NewMACFromBytes decodes a MAC from a 6-byte array
func NewMACFromBytes(b []byte) (MAC, error) {
if len(b) < 6 {
return MAC(0), ErrInvalidMACAddress
}
var m uint64
for i := 0; i < 6; i++ {
m <<= 8
m |= uint64(b[i])
}
return MAC(m), nil
}
// NewMACForNetworkMember computes the static MAC for a given address and network ID
func NewMACForNetworkMember(addr Address, nwid NetworkID) MAC {
// This is the same algorithm as found in MAC::fromAddress() in MAC.hpp
firstOctetForNetwork := byte((byte(nwid) & 0xfe) | 0x02)
if firstOctetForNetwork == 0x52 {
firstOctetForNetwork = 0x32
}
m := uint64(firstOctetForNetwork) << 40
m |= uint64(addr)
m ^= ((uint64(nwid) >> 8) & 0xff) << 32
m ^= ((uint64(nwid) >> 16) & 0xff) << 24
m ^= ((uint64(nwid) >> 24) & 0xff) << 16
m ^= ((uint64(nwid) >> 32) & 0xff) << 8
m ^= (uint64(nwid) >> 40) & 0xff
return MAC(m)
}
// String returns this MAC address in canonical human-readable form
func (m MAC) String() string {
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)