convert-ovs-ufid-to-tc-cookie.py

#!/usr/bin/python
#
# The script converts ovs ufid to tc cookie.
#
# ./convert-ovs-ufid-to-tc-cookie.py [ufid]
#

from __future__ import print_function
import sys
import os


if len(sys.argv) < 2:
    print("Usage: %s [ufid]" % os.path.basename(sys.argv[0]))
    sys.exit(1)

ufid = sys.argv[1]

try:
    sp = ufid.split('-')
    w3 = sp[4][:4]
    w4 = sp[3]
    w5 = sp[4][-8:]
    sp[3] = w3
    sp[4] = w4
    sp.append(w5)
except IndexError:
    print("ERROR: Invalid ufid ?")
    sys.exit(1)

# Replace w1 and w2
tmp = sp[1]
sp[1] = sp[2]
sp[2] = tmp

cookie = []
for i in sp:
    tmp = ""
    for j in range(int(len(i) / 2)):
        pos = j*2
        m = i[pos:pos+2]
        tmp = m + tmp
    cookie.append(tmp)

print(''.join(cookie))