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Diffstat (limited to 'src/op_mode/traceroute.py')
| -rwxr-xr-x | src/op_mode/traceroute.py | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/src/op_mode/traceroute.py b/src/op_mode/traceroute.py new file mode 100755 index 000000000..4299d6e5f --- /dev/null +++ b/src/op_mode/traceroute.py @@ -0,0 +1,207 @@ +#! /usr/bin/env python3 + +# Copyright (C) 2022 VyOS maintainers and contributors +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License version 2 or later as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +import os +import sys +import socket +import ipaddress + +options = { + 'backward-hops': { + 'traceroute': '{command} --back', + 'type': 'noarg', + 'help': 'Display number of backward hops when they different from the forwarded path' + }, + 'bypass': { + 'traceroute': '{command} -r', + 'type': 'noarg', + 'help': 'Bypass the normal routing tables and send directly to a host on an attached network' + }, + 'do-not-fragment': { + 'traceroute': '{command} -F', + 'type': 'noarg', + 'help': 'Do not fragment probe packets.' + }, + 'first-ttl': { + 'traceroute': '{command} -f {value}', + 'type': '<ttl>', + 'help': 'Specifies with what TTL to start. Defaults to 1.' + }, + 'icmp': { + 'traceroute': '{command} -I', + 'type': 'noarg', + 'help': 'Use ICMP ECHO for tracerouting' + }, + 'interface': { + 'traceroute': '{command} -i {value}', + 'type': '<interface>', + 'help': 'Source interface' + }, + 'lookup-as': { + 'traceroute': '{command} -A', + 'type': 'noarg', + 'help': 'Perform AS path lookups' + }, + 'mark': { + 'traceroute': '{command} --fwmark={value}', + 'type': '<fwmark>', + 'help': 'Set the firewall mark for outgoing packets' + }, + 'no-resolve': { + 'traceroute': '{command} -n', + 'type': 'noarg', + 'help': 'Do not resolve hostnames' + }, + 'port': { + 'traceroute': '{command} -p {value}', + 'type': '<port>', + 'help': 'Destination port' + }, + 'source-address': { + 'traceroute': '{command} -s {value}', + 'type': '<x.x.x.x> <h:h:h:h:h:h:h:h>', + 'help': 'Specify source IP v4/v6 address' + }, + 'tcp': { + 'traceroute': '{command} -T', + 'type': 'noarg', + 'help': 'Use TCP SYN for tracerouting (default port is 80)' + }, + 'tos': { + 'traceroute': '{commad} -t {value}', + 'type': '<tos>', + 'help': 'Mark packets with specified TOS' + }, + 'ttl': { + 'traceroute': '{command} -m {value}', + 'type': '<ttl>', + 'help': 'Maximum number of hops' + }, + 'udp': { + 'traceroute': '{command} -U', + 'type': 'noarg', + 'help': 'Use UDP to particular port for tracerouting (default port is 53)' + }, + 'vrf': { + 'traceroute': 'sudo ip vrf exec {value} {command}', + 'type': '<vrf>', + 'help': 'Use specified VRF table', + 'dflt': 'default'} +} + +traceroute = { + 4: '/bin/traceroute -4', + 6: '/bin/traceroute -6', +} + + +class List (list): + def first (self): + return self.pop(0) if self else '' + + def last(self): + return self.pop() if self else '' + + def prepend(self,value): + self.insert(0,value) + + +def expension_failure(option, completions): + reason = 'Ambiguous' if completions else 'Invalid' + sys.stderr.write('\n\n {} command: {} [{}]\n\n'.format(reason,' '.join(sys.argv), option)) + if completions: + sys.stderr.write(' Possible completions:\n ') + sys.stderr.write('\n '.join(completions)) + sys.stderr.write('\n') + sys.stdout.write('<nocomps>') + sys.exit(1) + + +def complete(prefix): + return [o for o in options if o.startswith(prefix)] + + +def convert(command, args): + while args: + shortname = args.first() + longnames = complete(shortname) + if len(longnames) != 1: + expension_failure(shortname, longnames) + longname = longnames[0] + if options[longname]['type'] == 'noarg': + command = options[longname]['traceroute'].format( + command=command, value='') + elif not args: + sys.exit(f'traceroute: missing argument for {longname} option') + else: + command = options[longname]['traceroute'].format( + command=command, value=args.first()) + return command + + +if __name__ == '__main__': + args = List(sys.argv[1:]) + host = args.first() + + if not host: + sys.exit("traceroute: Missing host") + + if host == '--get-options': + args.first() # pop traceroute + args.first() # pop IP + while args: + option = args.first() + + matched = complete(option) + if not args: + sys.stdout.write(' '.join(matched)) + sys.exit(0) + + if len(matched) > 1 : + sys.stdout.write(' '.join(matched)) + sys.exit(0) + + if options[matched[0]]['type'] == 'noarg': + continue + + value = args.first() + if not args: + matched = complete(option) + sys.stdout.write(options[matched[0]]['type']) + sys.exit(0) + + for name,option in options.items(): + if 'dflt' in option and name not in args: + args.append(name) + args.append(option['dflt']) + + try: + ip = socket.gethostbyname(host) + except UnicodeError: + sys.exit(f'tracroute: Unknown host: {host}') + except socket.gaierror: + ip = host + + try: + version = ipaddress.ip_address(ip).version + except ValueError: + sys.exit(f'traceroute: Unknown host: {host}') + + command = convert(traceroute[version],args) + + # print(f'{command} {host}') + os.system(f'{command} {host}') + |