1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
# -*- test-case-name: twisted.runner.test.test_inetdconf -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Parser for inetd.conf files
"""
# Various exceptions
class InvalidConfError(Exception):
"""
Invalid configuration file
"""
class InvalidInetdConfError(InvalidConfError):
"""
Invalid inetd.conf file
"""
class InvalidServicesConfError(InvalidConfError):
"""
Invalid services file
"""
class UnknownService(Exception):
"""
Unknown service name
"""
class SimpleConfFile:
"""
Simple configuration file parser superclass.
Filters out comments and empty lines (which includes lines that only
contain comments).
To use this class, override parseLine or parseFields.
"""
commentChar = '#'
defaultFilename = None
def parseFile(self, file=None):
"""
Parse a configuration file
If file is None and self.defaultFilename is set, it will open
defaultFilename and use it.
"""
close = False
if file is None and self.defaultFilename:
file = open(self.defaultFilename,'r')
close = True
try:
for line in file.readlines():
# Strip out comments
comment = line.find(self.commentChar)
if comment != -1:
line = line[:comment]
# Strip whitespace
line = line.strip()
# Skip empty lines (and lines which only contain comments)
if not line:
continue
self.parseLine(line)
finally:
if close:
file.close()
def parseLine(self, line):
"""
Override this.
By default, this will split the line on whitespace and call
self.parseFields (catching any errors).
"""
try:
self.parseFields(*line.split())
except ValueError:
raise InvalidInetdConfError('Invalid line: ' + repr(line))
def parseFields(self, *fields):
"""
Override this.
"""
class InetdService:
"""
A simple description of an inetd service.
"""
name = None
port = None
socketType = None
protocol = None
wait = None
user = None
group = None
program = None
programArgs = None
def __init__(self, name, port, socketType, protocol, wait, user, group,
program, programArgs):
self.name = name
self.port = port
self.socketType = socketType
self.protocol = protocol
self.wait = wait
self.user = user
self.group = group
self.program = program
self.programArgs = programArgs
class InetdConf(SimpleConfFile):
"""
Configuration parser for a traditional UNIX inetd(8)
"""
defaultFilename = '/etc/inetd.conf'
def __init__(self, knownServices=None):
self.services = []
if knownServices is None:
knownServices = ServicesConf()
knownServices.parseFile()
self.knownServices = knownServices
def parseFields(self, serviceName, socketType, protocol, wait, user,
program, *programArgs):
"""
Parse an inetd.conf file.
Implemented from the description in the Debian inetd.conf man page.
"""
# Extract user (and optional group)
user, group = (user.split('.') + [None])[:2]
# Find the port for a service
port = self.knownServices.services.get((serviceName, protocol), None)
if not port and not protocol.startswith('rpc/'):
# FIXME: Should this be discarded/ignored, rather than throwing
# an exception?
try:
port = int(serviceName)
serviceName = 'unknown'
except:
raise UnknownService("Unknown service: %s (%s)" % (
serviceName, protocol))
self.services.append(InetdService(serviceName, port, socketType,
protocol, wait, user, group, program,
programArgs))
class ServicesConf(SimpleConfFile):
"""
/etc/services parser
@ivar services: dict mapping service names to (port, protocol) tuples.
"""
defaultFilename = '/etc/services'
def __init__(self):
self.services = {}
def parseFields(self, name, portAndProtocol, *aliases):
try:
port, protocol = portAndProtocol.split('/')
port = int(port)
except:
raise InvalidServicesConfError(
'Invalid port/protocol: %s' % (repr(portAndProtocol),))
self.services[(name, protocol)] = port
for alias in aliases:
self.services[(alias, protocol)] = port
|
