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1 office 1 #!/usr/bin/env python
2 #
3 # Parses the CSV version of the IANA Service Name and Transport Protocol Port Number Registry
4 # and generates a services(5) file.
5 #
6 # Wireshark - Network traffic analyzer
7 # By Gerald Combs <gerald@wireshark.org>
8 # Copyright 2013 Gerald Combs
9 #
10 # This program is free software; you can redistribute it and/or
11 # modify it under the terms of the GNU General Public License
12 # as published by the Free Software Foundation; either version 2
13 # of the License, or (at your option) any later version.
14 #
15 # This program is distributed in the hope that it will be useful,
16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 # GNU General Public License for more details.
19 #
20 # You should have received a copy of the GNU General Public License
21 # along with this program; if not, write to the Free Software
22 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23  
24 iana_svc_url = 'http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv'
25  
26 __doc__ = '''\
27 Usage: make-services.py [url]
28  
29 url defaults to
30 %s
31 ''' % (iana_svc_url)
32  
33 import sys
34 import getopt
35 import csv
36 import re
37  
38 python_version = sys.hexversion >> 16
39 if python_version < 0x300:
40 import urllib
41 else:
42 import urllib.request, urllib.error, urllib.parse
43 import codecs
44  
45 services_file = 'services'
46  
47 exclude_services = [
48 '^spr-itunes',
49 '^spl-itunes',
50 '^shilp',
51 ]
52  
53 exclude_comments = [
54 'should not be used for discovery purposes',
55 'NOTE Conflict',
56 ]
57  
58 min_body_size = 900000 # Size was ~ 922000 on 2013-08-06
59  
60 def parse_rows(svc_fd):
61 lines = []
62 port_reader = csv.reader(svc_fd)
63  
64 # Header positions as of 2013-08-06
65 if python_version < 0x206:
66 headers = port_reader.next()
67 else:
68 headers = next(port_reader)
69  
70 try:
71 sn_pos = headers.index('Service Name')
72 except:
73 sn_pos = 0
74 try:
75 pn_pos = headers.index('Port Number')
76 except:
77 pn_pos = 1
78 try:
79 tp_pos = headers.index('Transport Protocol')
80 except:
81 tp_pos = 2
82  
83 positions = [sn_pos, pn_pos, tp_pos]
84 positions.sort()
85 positions.reverse()
86  
87 for row in port_reader:
88 service = row[sn_pos]
89 port = row[pn_pos]
90 proto = row[tp_pos]
91  
92 if len(service) < 1 or len(port) < 1 or len(proto) < 1:
93 continue
94  
95 for pos in positions:
96 del row[pos]
97 row = filter(None, row)
98 comment = ' '.join(row)
99 comment = re.sub('[\n]', '', comment)
100  
101 if re.search('|'.join(exclude_services), service):
102 continue
103 if re.search('|'.join(exclude_comments), comment):
104 continue
105  
106 lines.append('%-15s %5s/%s # %s' % (
107 service,
108 port,
109 proto,
110 comment
111 ))
112  
113 return '\n'.join(lines)
114  
115 def exit_msg(msg=None, status=1):
116 if msg is not None:
117 sys.stderr.write(msg + '\n\n')
118 sys.stderr.write(__doc__ + '\n')
119 sys.exit(status)
120  
121 def main(argv):
122 try:
123 opts, args = getopt.getopt(argv, "h", ["help"])
124 except getopt.GetoptError:
125 exit_msg()
126 for opt, arg in opts:
127 if opt in ("-h", "--help"):
128 exit_msg(None, 0)
129  
130 if (len(argv) > 0):
131 svc_url = argv[0]
132 else:
133 svc_url = iana_svc_url
134  
135 try:
136 if python_version < 0x300:
137 svc_fd = urllib.urlopen(svc_url)
138 else:
139 req = urllib.request.urlopen(svc_url)
140 svc_fd = codecs.getreader('utf8')(req)
141 except:
142 exit_msg('Error opening ' + svc_url)
143  
144 body = parse_rows(svc_fd)
145 if len(body) < min_body_size:
146 exit_msg('Not enough parsed data')
147  
148 out = open(services_file, 'w')
149 out.write('''\
150 # This is a local copy of the IANA port-numbers file.
151 #
152 # Wireshark uses it to resolve port numbers into human readable
153 # service names, e.g. TCP port 80 -> http.
154 #
155 # It is subject to copyright and being used with IANA's permission:
156 # http://www.wireshark.org/lists/wireshark-dev/200708/msg00160.html
157 #
158 # The original file can be found at:
159 # %s
160 #
161  
162 %s
163 ''' % (iana_svc_url, body))
164  
165 if __name__ == "__main__":
166 sys.exit(main(sys.argv[1:]))