root / snf-common / synnefo / util / mac2eui64.py @ d509e6da
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# Copyright 2011, 2012, 2013 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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#
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from IPy import IP |
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# Adapted from NFDHCPD's mac2eui64 utility, repository commit:feca7bb95
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def mac2eui64(mac, prefixstr): |
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try:
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prefix = IP(prefixstr) |
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except ValueError: |
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raise Exception("Invalid IPv6 prefix '%s'" % prefixstr) |
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if prefix.version() != 6: |
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raise Exception("%s is not a valid IPv6 prefix" % prefixstr) |
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if prefix.prefixlen() != 64: |
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raise Exception("Cannot generate an EUI-64 address on a non-64 subnet") |
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mac_parts = mac.split(":")
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pfx_parts = prefix.net().strFullsize().split(":")
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if len(mac_parts) != 6: |
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raise Exception("%s is not a valid MAC-48 address" % mac) |
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eui64 = mac_parts[:3] + ["ff", "fe"] + mac_parts[3:] |
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eui64[0] = "%02x" % (int(eui64[0], 16) ^ 0x02) |
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ip = ":".join(pfx_parts[:4]) |
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for l in range(0, len(eui64), 2): |
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ip += ":%s" % "".join(eui64[l:l + 2]) |
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return IP(ip).strCompressed()
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# vim: set ts=4 sts=4 sw=4 et ai :
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