root / util / mac2eui64.py @ ee66adf0
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1 | 9cb903f9 | Vangelis Koukis | # Copyright 2011 GRNET S.A. All rights reserved.
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2 | 9cb903f9 | Vangelis Koukis | #
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3 | 9cb903f9 | Vangelis Koukis | # Redistribution and use in source and binary forms, with or
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4 | 9cb903f9 | Vangelis Koukis | # without modification, are permitted provided that the following
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5 | 9cb903f9 | Vangelis Koukis | # conditions are met:
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6 | 9cb903f9 | Vangelis Koukis | #
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7 | 9cb903f9 | Vangelis Koukis | # 1. Redistributions of source code must retain the above
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8 | 9cb903f9 | Vangelis Koukis | # copyright notice, this list of conditions and the following
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9 | 9cb903f9 | Vangelis Koukis | # disclaimer.
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10 | 9cb903f9 | Vangelis Koukis | #
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11 | 9cb903f9 | Vangelis Koukis | # 2. Redistributions in binary form must reproduce the above
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12 | 9cb903f9 | Vangelis Koukis | # copyright notice, this list of conditions and the following
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13 | 9cb903f9 | Vangelis Koukis | # disclaimer in the documentation and/or other materials
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14 | 9cb903f9 | Vangelis Koukis | # provided with the distribution.
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15 | 9cb903f9 | Vangelis Koukis | #
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16 | 9cb903f9 | Vangelis Koukis | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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17 | 9cb903f9 | Vangelis Koukis | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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18 | 9cb903f9 | Vangelis Koukis | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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19 | 9cb903f9 | Vangelis Koukis | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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20 | 9cb903f9 | Vangelis Koukis | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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21 | 9cb903f9 | Vangelis Koukis | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 | 9cb903f9 | Vangelis Koukis | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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23 | 9cb903f9 | Vangelis Koukis | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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24 | 9cb903f9 | Vangelis Koukis | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | 9cb903f9 | Vangelis Koukis | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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26 | 9cb903f9 | Vangelis Koukis | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 | 9cb903f9 | Vangelis Koukis | # POSSIBILITY OF SUCH DAMAGE.
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28 | 9cb903f9 | Vangelis Koukis | #
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29 | 9cb903f9 | Vangelis Koukis | # The views and conclusions contained in the software and
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30 | 9cb903f9 | Vangelis Koukis | # documentation are those of the authors and should not be
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31 | 9cb903f9 | Vangelis Koukis | # interpreted as representing official policies, either expressed
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32 | 9cb903f9 | Vangelis Koukis | # or implied, of GRNET S.A.
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33 | 9cb903f9 | Vangelis Koukis | #
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34 | 9cb903f9 | Vangelis Koukis | |
35 | 9cb903f9 | Vangelis Koukis | import sys |
36 | 9cb903f9 | Vangelis Koukis | from IPy import IP |
37 | 9cb903f9 | Vangelis Koukis | |
38 | 9cb903f9 | Vangelis Koukis | # Adapted from NFDHCPD's mac2eui64 utility, repository commit:feca7bb95
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39 | 9cb903f9 | Vangelis Koukis | |
40 | 9cb903f9 | Vangelis Koukis | def mac2eui64(mac, prefixstr): |
41 | 9cb903f9 | Vangelis Koukis | try:
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42 | 9cb903f9 | Vangelis Koukis | prefix = IP(prefixstr) |
43 | 9cb903f9 | Vangelis Koukis | except ValueError: |
44 | 9cb903f9 | Vangelis Koukis | raise Exception("Invalid IPv6 prefix '%s'" % prefixstr) |
45 | 9cb903f9 | Vangelis Koukis | |
46 | 9cb903f9 | Vangelis Koukis | if prefix.version() != 6: |
47 | 9cb903f9 | Vangelis Koukis | raise Exception("%s is not a valid IPv6 prefix" % prefixstr) |
48 | 9cb903f9 | Vangelis Koukis | |
49 | 9cb903f9 | Vangelis Koukis | if prefix.prefixlen() != 64: |
50 | 9cb903f9 | Vangelis Koukis | raise Exception("Cannot generate an EUI-64 address on a non-64 subnet") |
51 | 9cb903f9 | Vangelis Koukis | |
52 | 9cb903f9 | Vangelis Koukis | mac_parts = mac.split(":")
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53 | 9cb903f9 | Vangelis Koukis | pfx_parts = prefix.net().strFullsize().split(":")
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54 | 9cb903f9 | Vangelis Koukis | |
55 | 9cb903f9 | Vangelis Koukis | if len(mac_parts) != 6: |
56 | 9cb903f9 | Vangelis Koukis | raise Exception("%s is not a valid MAC-48 address" % mac) |
57 | 9cb903f9 | Vangelis Koukis | |
58 | 9cb903f9 | Vangelis Koukis | eui64 = mac_parts[:3] + [ "ff", "fe" ] + mac_parts[3:] |
59 | 9cb903f9 | Vangelis Koukis | |
60 | 9cb903f9 | Vangelis Koukis | eui64[0] = "%02x" % (int(eui64[0], 16) ^ 0x02) |
61 | 9cb903f9 | Vangelis Koukis | |
62 | 9cb903f9 | Vangelis Koukis | ip = ":".join(pfx_parts[:4]) |
63 | 9cb903f9 | Vangelis Koukis | for l in range(0, len(eui64), 2): |
64 | 9cb903f9 | Vangelis Koukis | ip += ":%s" % "".join(eui64[l:l+2]) |
65 | 9cb903f9 | Vangelis Koukis | |
66 | 9cb903f9 | Vangelis Koukis | return IP(ip).strCompressed()
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67 | 9cb903f9 | Vangelis Koukis | |
68 | 9cb903f9 | Vangelis Koukis | # vim: set ts=4 sts=4 sw=4 et ai : |