ip: rewrite routel in python
Not sure if anyone uses the routel script. The script was a combination of ip route, shell and awk doing command scraping. It is now possible to do this much better using the JSON output formats and python. Rewriting also fixes the bug where the old script could not parse the current output format. At the end was getting: /usr/bin/routel: 48: shift: can't shift that many The new script also has IPv6 as option. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David Ahern <dsahern@kernel.org>
This commit is contained in:
Stephen Hemminger
committed by
David Ahern
David Ahern
parent
1eaebad2c5
commit
6d676ad934
124
ip/routel
124
ip/routel
@@ -1,72 +1,62 @@
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#!/bin/sh
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#! /usr/bin/env python3
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# SPDX-License-Identifier: GPL-2.0
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#
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# Script created by: Stephen R. van den Berg <srb@cuci.nl>, 1999/04/18
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# Donated to the public domain.
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#
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# This script transforms the output of "ip" into more readable text.
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# "ip" is the Linux-advanced-routing configuration tool part of the
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# iproute package.
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#
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# This is simple script to process JSON output from ip route
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# command and format it. Based on earlier shell script version.
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"""Script to parse ip route output into more readable text."""
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test "X-h" = "X$1" && echo "Usage: $0 [tablenr [raw ip args...]]" && exit 64
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import sys
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import json
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import getopt
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import subprocess
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test -z "$*" && set 0
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ip route list table "$@" |
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while read network rest
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do set xx $rest
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shift
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proto=""
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via=""
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dev=""
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scope=""
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src=""
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table=""
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case $network in
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broadcast|local|unreachable) via=$network
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network=$1
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shift
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;;
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esac
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while test $# != 0
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do
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case "$1" in
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proto|via|dev|scope|src|table)
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key=$1
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val=$2
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eval "$key='$val'"
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shift 2
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;;
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dead|onlink|pervasive|offload|notify|linkdown|unresolved)
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shift
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;;
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*)
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# avoid infinite loop on unknown keyword without value at line end
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shift
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shift
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;;
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esac
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done
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echo "$network $via $src $proto $scope $dev $table"
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done | awk -F ' ' '
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BEGIN {
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format="%15s%-3s %15s %15s %8s %8s%7s %s\n";
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printf(format,"target","","gateway","source","proto","scope","dev","tbl");
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}
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{ network=$1;
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mask="";
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if(match(network,"/"))
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{ mask=" "substr(network,RSTART+1);
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network=substr(network,0,RSTART);
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}
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via=$2;
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src=$3;
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proto=$4;
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scope=$5;
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dev=$6;
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table=$7;
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printf(format,network,mask,via,src,proto,scope,dev,table);
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}
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'
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def usage():
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'''Print usage and exit'''
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print("Usage: {} [tablenr [raw ip args...]]".format(sys.argv[0]))
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sys.exit(64)
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def main():
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'''Process the arguments'''
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family = 'inet'
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try:
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opts, args = getopt.getopt(sys.argv[1:], "h46f:", ["help", "family="])
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except getopt.GetoptError as err:
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print(err)
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usage()
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for opt, arg in opts:
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if opt in ["-h", "--help"]:
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usage()
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elif opt == '-6':
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family = 'inet6'
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elif opt == "-4":
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family = 'inet'
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elif opt in ["-f", "--family"]:
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family = arg
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else:
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assert False, "unhandled option"
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if not args:
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args = ['0']
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cmd = ['ip', '-f', family, '-j', 'route', 'list', 'table'] + args
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process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
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tbl = json.load(process.stdout)
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if family == 'inet':
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fmt = '{:15} {:15} {:15} {:8} {:8}{:<16} {}'
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else:
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fmt = '{:32} {:32} {:32} {:8} {:8}{:<16} {}'
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# ip route json keys
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keys = ['dst', 'gateway', 'prefsrc', 'protocol', 'scope', 'dev', 'table']
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print(fmt.format(*map(lambda x: x.capitalize(), keys)))
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for record in tbl:
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fields = [record[k] if k in record else '' for k in keys]
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print(fmt.format(*fields))
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if __name__ == "__main__":
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main()
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@@ -1,17 +1,31 @@
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.TH "ROUTEL" "8" "3 Jan, 2008" "iproute2" "Linux"
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.TH ROUTEL 8 "1 Sept, 2021" "iproute2" "Linux"
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.SH "NAME"
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.LP
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routel \- list routes with pretty output format
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.SH "SYNTAX"
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.LP
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routel [\fItablenr\fP [\fIraw ip args...\fP]]
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.SH SYNOPSIS
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.B routel
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.RI "[ " OPTIONS " ]"
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.RI "[ " tablenr
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[ \fIip route options...\fR ] ]
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.P
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.ti 8
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.IR OPTIONS " := {"
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\fB-h\fR | \fB--help\fR |
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[{\fB-f\fR | \fB--family\fR }
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{\fBinet\fR | \fBinet6\fR } |
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\fB-4\fR | \fB-6\fR }
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.SH "DESCRIPTION"
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.LP
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The routel script will list routes in a format that some might consider easier to interpret
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then the ip route list equivalent.
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The routel script will list routes in a format that some might consider
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easier to interpret then the
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.B ip
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route list equivalent.
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.SH "AUTHORS"
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.LP
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The routel script was written by Stephen R. van den Berg <srb@cuci.nl>, 1999/04/18 and donated to the public domain.
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Rewritten by Stephen Hemminger <stephen@networkplumber.org>.
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.br
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Original script by Stephen R. van den Berg <srb@cuci.nl>.
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.br
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This manual page was written by Andreas Henriksson <andreas@fatal.se>, for the Debian GNU/Linux system.
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.SH "SEE ALSO"
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