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#!/usr/bin/env python3
#
# Parses the CSV version of the IANA Service Name and Transport Protocol Port Number Registry
# and generates a services(5) file.
#
# Wireshark - Network traffic analyzer
# By Gerald Combs <gerald@wireshark.org>
# Copyright 2013 Gerald Combs
#
# SPDX-License-Identifier: GPL-2.0-or-later
iana_svc_url = 'https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv'
__doc__ = '''\
Usage: make-services.py [url]
url defaults to
%s
''' % (iana_svc_url)
import sys
import getopt
import csv
import re
import collections
import urllib.request, urllib.error, urllib.parse
import codecs
services_file = 'services'
exclude_services = [
'^spr-itunes',
'^spl-itunes',
'^shilp',
]
min_source_lines = 14000 # Size was ~ 14800 on 2017-07-20
def parse_port(port_str):
p = port_str.split('-')
try:
if len(p) == 1:
return tuple([int(p[0])])
if len(p) == 2:
return tuple([int(p[0]), int(p[1])])
except ValueError:
pass
return ()
def port_to_str(port):
if len(port) == 2:
return str(port[0]) + '-' + str(port[1])
return str(port[0])
def parse_rows(svc_fd):
port_reader = csv.reader(svc_fd)
count = 0
# Header positions as of 2013-08-06
headers = next(port_reader)
try:
sn_pos = headers.index('Service Name')
except Exception:
sn_pos = 0
try:
pn_pos = headers.index('Port Number')
except Exception:
pn_pos = 1
try:
tp_pos = headers.index('Transport Protocol')
except Exception:
tp_pos = 2
try:
desc_pos = headers.index('Description')
except Exception:
desc_pos = 3
services_map = {}
for row in port_reader:
service = row[sn_pos]
port = parse_port(row[pn_pos])
proto = row[tp_pos]
description = row[desc_pos]
count += 1
if len(service) < 1 or not port or len(proto) < 1:
continue
if re.search('|'.join(exclude_services), service):
continue
# max 15 chars
service = service[:15].rstrip()
# replace blanks (for some non-standard long names)
service = service.replace(" ", "-")
description = description.replace("\n", "")
description = re.sub("IANA assigned this well-formed service .+$", "", description)
description = re.sub(" +", " ", description)
description = description.strip()
if description == service or description == service.replace("-", " "):
description = None
if not port in services_map:
services_map[port] = collections.OrderedDict()
# Remove some duplicates (first entry wins)
proto_exists = False
for k in services_map[port].keys():
if proto in services_map[port][k]:
proto_exists = True
break
if proto_exists:
continue
if not service in services_map[port]:
services_map[port][service] = [description]
services_map[port][service].append(proto)
if count < min_source_lines:
exit_msg('Not enough parsed data')
return services_map
def write_body(d, f):
keys = list(d.keys())
keys.sort()
for port in keys:
for serv in d[port].keys():
sep = "\t" * (1 + abs((15 - len(serv)) // 8))
port_str = port_to_str(port) + "/" + "/".join(d[port][serv][1:])
line = serv + sep + port_str
description = d[port][serv][0]
if description:
sep = "\t"
if len(port_str) < 8:
sep *= 2
line += sep + "# " + description
line += "\n"
f.write(line)
def exit_msg(msg=None, status=1):
if msg is not None:
sys.stderr.write(msg + '\n\n')
sys.stderr.write(__doc__ + '\n')
sys.exit(status)
def main(argv):
if sys.version_info[0] < 3:
print("This requires Python 3")
sys.exit(2)
try:
opts, _ = getopt.getopt(argv, "h", ["help"])
except getopt.GetoptError:
exit_msg()
for opt, _ in opts:
if opt in ("-h", "--help"):
exit_msg(None, 0)
if (len(argv) > 0):
svc_url = argv[0]
else:
svc_url = iana_svc_url
try:
if not svc_url.startswith('http'):
svc_fd = open(svc_url)
else:
req = urllib.request.urlopen(svc_url)
svc_fd = codecs.getreader('utf8')(req)
except Exception:
exit_msg('Error opening ' + svc_url)
body = parse_rows(svc_fd)
out = open(services_file, 'w')
out.write('''\
# This is a local copy of the IANA port-numbers file.
#
# Wireshark uses it to resolve port numbers into human readable
# service names, e.g. TCP port 80 -> http.
#
# It is subject to copyright and being used with IANA's permission:
# https://www.wireshark.org/lists/wireshark-dev/200708/msg00160.html
#
# The original file can be found at:
# %s
#
# The format is the same as that used for services(5). It is allowed to merge
# identical protocols, for example:
# foo 64/tcp
# foo 64/udp
# becomes
# foo 64/tcp/udp
#
''' % (iana_svc_url))
write_body(body, out)
out.close()
if __name__ == "__main__":
sys.exit(main(sys.argv[1:]))
|
