root / snf-cyclades-app / synnefo / logic / mac2eui64 @ 2e1e6844
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1 | 37db18f3 | Christos Stavrakakis | #!/usr/bin/env python |
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2 | 37db18f3 | Christos Stavrakakis | |
3 | 37db18f3 | Christos Stavrakakis | import sys |
4 | 37db18f3 | Christos Stavrakakis | from IPy import IP |
5 | 37db18f3 | Christos Stavrakakis | |
6 | 37db18f3 | Christos Stavrakakis | if len(sys.argv) != 3: |
7 | 37db18f3 | Christos Stavrakakis | sys.stderr.write("Usage: %s <mac_address> <IPv6 prefix>\n" % sys.argv[0]) |
8 | 37db18f3 | Christos Stavrakakis | sys.exit(127) |
9 | 37db18f3 | Christos Stavrakakis | |
10 | 37db18f3 | Christos Stavrakakis | mac = sys.argv[1] |
11 | 37db18f3 | Christos Stavrakakis | try: |
12 | 37db18f3 | Christos Stavrakakis | prefix = IP(sys.argv[2]) |
13 | 37db18f3 | Christos Stavrakakis | except ValueError: |
14 | 37db18f3 | Christos Stavrakakis | sys.stderr.write("Invalid IPv6 prefix '%s'\n" % sys.argv[2]) |
15 | 37db18f3 | Christos Stavrakakis | sys.exit(1) |
16 | 37db18f3 | Christos Stavrakakis | |
17 | 37db18f3 | Christos Stavrakakis | |
18 | 37db18f3 | Christos Stavrakakis | if prefix.version() != 6: |
19 | 37db18f3 | Christos Stavrakakis | sys.stderr.write("%s is not a valid IPv6 prefix\n" % prefix) |
20 | 37db18f3 | Christos Stavrakakis | sys.exit(1) |
21 | 37db18f3 | Christos Stavrakakis | |
22 | 37db18f3 | Christos Stavrakakis | if prefix.prefixlen() != 64: |
23 | 37db18f3 | Christos Stavrakakis | sys.stderr.write("Cannot generate an EUI-64 address on a non-64 subnet\n") |
24 | 37db18f3 | Christos Stavrakakis | sys.exit(1) |
25 | 37db18f3 | Christos Stavrakakis | |
26 | 37db18f3 | Christos Stavrakakis | mac_parts = mac.split(":") |
27 | 37db18f3 | Christos Stavrakakis | pfx_parts = prefix.net().strFullsize().split(":") |
28 | 37db18f3 | Christos Stavrakakis | |
29 | 37db18f3 | Christos Stavrakakis | if len(mac_parts) != 6: |
30 | 37db18f3 | Christos Stavrakakis | sys.stderr.write("%s is not a valid MAC-48 address\n" % mac) |
31 | 37db18f3 | Christos Stavrakakis | sys.exit(1) |
32 | 37db18f3 | Christos Stavrakakis | |
33 | 37db18f3 | Christos Stavrakakis | eui64 = mac_parts[:3] + [ "ff", "fe" ] + mac_parts[3:] |
34 | 37db18f3 | Christos Stavrakakis | |
35 | 37db18f3 | Christos Stavrakakis | eui64[0] = "%02x" % (int(eui64[0], 16) ^ 0x02) |
36 | 37db18f3 | Christos Stavrakakis | |
37 | 37db18f3 | Christos Stavrakakis | ip = ":".join(pfx_parts[:4]) |
38 | 37db18f3 | Christos Stavrakakis | for l in range(0, len(eui64), 2): |
39 | 37db18f3 | Christos Stavrakakis | ip += ":%s" % "".join(eui64[l:l+2]) |
40 | 37db18f3 | Christos Stavrakakis | |
41 | 37db18f3 | Christos Stavrakakis | try: |
42 | 37db18f3 | Christos Stavrakakis | print IP(ip).strCompressed() |
43 | 37db18f3 | Christos Stavrakakis | except ValueError, e: |
44 | 37db18f3 | Christos Stavrakakis | sys.stderr.write("Ooops, something went wrong: '%s'!\n" % str(e)) |
45 | 37db18f3 | Christos Stavrakakis | |
46 | 37db18f3 | Christos Stavrakakis | # vim: set ts=4 sts=4 sw=4 et ai : |