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#! /usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0
#
# This is simple script to process JSON output from ip route
# command and format it. Based on earlier shell script version.
"""Script to parse ip route output into more readable text."""
import sys
import json
import getopt
import subprocess
def usage():
'''Print usage and exit'''
print("Usage: {} [tablenr [raw ip args...]]".format(sys.argv[0]))
sys.exit(64)
def main():
'''Process the arguments'''
family = 'inet'
try:
opts, args = getopt.getopt(sys.argv[1:], "h46f:", ["help", "family="])
except getopt.GetoptError as err:
print(err)
usage()
for opt, arg in opts:
if opt in ["-h", "--help"]:
usage()
elif opt == '-6':
family = 'inet6'
elif opt == "-4":
family = 'inet'
elif opt in ["-f", "--family"]:
family = arg
else:
assert False, "unhandled option"
if not args:
args = ['0']
cmd = ['ip', '-f', family, '-j', 'route', 'list', 'table'] + args
process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
tbl = json.load(process.stdout)
if family == 'inet':
fmt = '{:15} {:15} {:15} {:8} {:8}{:<16} {}'
else:
fmt = '{:32} {:32} {:32} {:8} {:8}{:<16} {}'
# ip route json keys
keys = ['dst', 'gateway', 'prefsrc', 'protocol', 'scope', 'dev', 'table']
print(fmt.format(*map(lambda x: x.capitalize(), keys)))
for record in tbl:
fields = [record[k] if k in record else '' for k in keys]
print(fmt.format(*fields))
if __name__ == "__main__":
main()
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