root / snf-cyclades-app / synnefo / logic / mac2eui64 @ 039e3e61
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#!/usr/bin/env python |
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import sys |
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from IPy import IP |
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|
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if len(sys.argv) != 3: |
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sys.stderr.write("Usage: %s <mac_address> <IPv6 prefix>\n" % sys.argv[0]) |
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sys.exit(127) |
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|
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mac = sys.argv[1] |
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try: |
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prefix = IP(sys.argv[2]) |
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except ValueError: |
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sys.stderr.write("Invalid IPv6 prefix '%s'\n" % sys.argv[2]) |
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sys.exit(1) |
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|
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|
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if prefix.version() != 6: |
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sys.stderr.write("%s is not a valid IPv6 prefix\n" % prefix) |
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sys.exit(1) |
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|
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if prefix.prefixlen() != 64: |
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sys.stderr.write("Cannot generate an EUI-64 address on a non-64 subnet\n") |
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sys.exit(1) |
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|
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mac_parts = mac.split(":") |
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pfx_parts = prefix.net().strFullsize().split(":") |
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|
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if len(mac_parts) != 6: |
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sys.stderr.write("%s is not a valid MAC-48 address\n" % mac) |
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sys.exit(1) |
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|
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eui64 = mac_parts[:3] + [ "ff", "fe" ] + mac_parts[3:] |
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|
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eui64[0] = "%02x" % (int(eui64[0], 16) ^ 0x02) |
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|
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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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|
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try: |
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print IP(ip).strCompressed() |
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except ValueError, e: |
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sys.stderr.write("Ooops, something went wrong: '%s'!\n" % str(e)) |
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# vim: set ts=4 sts=4 sw=4 et ai : |