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1 | #!/usr/bin/python |
2 | ############################################################################### | |
3 | # # | |
4 | # Cappie # | |
5 | # Copyright (C) 2010 Michael Tremer # | |
6 | # # | |
7 | # This program is free software: you can redistribute it and/or modify # | |
8 | # it under the terms of the GNU General Public License as published by # | |
9 | # the Free Software Foundation, either version 3 of the License, or # | |
10 | # (at your option) any later version. # | |
11 | # # | |
12 | # This program is distributed in the hope that it will be useful, # | |
13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of # | |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | |
15 | # GNU General Public License for more details. # | |
16 | # # | |
17 | # You should have received a copy of the GNU General Public License # | |
18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. # | |
19 | # # | |
20 | ############################################################################### | |
21 | ||
22 | import logging | |
23 | import logging.handlers | |
24 | import pcapy | |
25 | import time | |
26 | ||
27 | from ConfigParser import ConfigParser | |
28 | from threading import Thread | |
29 | ||
30 | import protocol | |
31 | import queue | |
64e40ed0 | 32 | import util |
53478050 MT |
33 | |
34 | from errors import * | |
54e92b60 | 35 | from events import * |
53478050 MT |
36 | |
37 | def getAllInterfaces(): | |
38 | filters = ("lo", "any") | |
39 | ret = [] | |
40 | for dev in pcapy.findalldevs(): | |
41 | if not dev in filters: | |
42 | ret.append(dev) | |
43 | return ret | |
44 | ||
45 | class Cappie(object): | |
46 | def __init__(self): | |
47 | self.__interfaces = [] | |
48 | ||
49 | self.log = logging.getLogger("cappie") | |
50 | self.log.setLevel(logging.INFO) | |
51 | ||
52 | # Log to console | |
53 | handler = logging.StreamHandler() | |
54 | handler.setFormatter(logging.Formatter("%(levelname)7s %(message)s")) | |
55 | self.log.addHandler(handler) | |
56 | ||
57 | # Setup syslog | |
58 | handler = logging.handlers.SysLogHandler("/dev/log") | |
59 | handler.setFormatter(logging.Formatter("cappie: %(message)s")) | |
60 | self.log.addHandler(handler) | |
61 | ||
62 | self.queue = queue.Queue(self.log) | |
63 | ||
64 | self.log.info("Cappie successfully started") | |
65 | ||
66 | def __del__(self): | |
67 | self.shutdown() | |
68 | self.log.info("Exiting") | |
69 | ||
70 | def setDebug(self, debug): | |
71 | if debug: | |
72 | self.log.setLevel(logging.DEBUG) | |
73 | else: | |
74 | self.log.setLevel(logging.INFO) | |
75 | ||
76 | def addInterface(self, dev, **kwargs): | |
77 | if not dev in getAllInterfaces(): | |
78 | raise InterfaceError, "No such interface %s" % dev | |
79 | ||
80 | kwargs["cappie"] = self | |
81 | ||
82 | iface = Interface(dev, **kwargs) | |
83 | self.__interfaces.append(iface) | |
84 | ||
85 | def run(self): | |
86 | if not self.__interfaces: | |
87 | raise RuntimeError, "No interfaces were configured" | |
88 | ||
89 | # Start queue | |
90 | self.queue.start() | |
91 | ||
92 | # Start a thread for each interface | |
93 | for iface in self.__interfaces: | |
94 | iface.start() | |
95 | ||
96 | while True: | |
74e192ba | 97 | if not self.queue.isAlive(): |
53478050 MT |
98 | self.log.critical("Queue thread died unexpectedly.") |
99 | return | |
100 | ||
101 | for iface in self.__interfaces: | |
74e192ba | 102 | if not iface.isAlive(): |
53478050 MT |
103 | self.log.critical("Thread died unexpectedly. %s" % iface.dev) |
104 | return | |
105 | time.sleep(60) | |
106 | ||
107 | def readConfig(self, configfile): | |
108 | config = ConfigParser() | |
109 | config.read([configfile]) | |
110 | ||
111 | global_opts = {} | |
112 | if config.has_section("global"): | |
113 | for option, value in config.items("global"): | |
114 | global_opts[option] = value | |
115 | ||
116 | config.remove_section("global") | |
117 | ||
118 | for iface in config.sections(): | |
119 | options = {} | |
120 | for option, value in config.items(iface): | |
121 | options[option] = value | |
122 | self.addInterface(iface, **options) | |
123 | ||
124 | def shutdown(self): | |
125 | for iface in self.__interfaces: | |
126 | iface.shutdown() | |
127 | ||
128 | self.queue.shutdown() | |
129 | ||
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130 | @property |
131 | def db(self): | |
132 | return self.queue.db | |
133 | ||
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134 | |
135 | class Interface(Thread): | |
136 | heartbeat = 0.1 | |
137 | ||
138 | def __init__(self, dev, cappie, promisc=False, mtu=1500): | |
139 | Thread.__init__(self) | |
140 | ||
141 | self.cappie = cappie | |
142 | self.dev = dev | |
143 | self.log = self.cappie.log | |
144 | self.mtu = mtu | |
145 | self.promisc = promisc | |
146 | self.queue = self.cappie.queue | |
147 | ||
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148 | self.log.debug("Created new interface %s" % self.dev) |
149 | ||
150 | self.__running = True | |
151 | ||
152 | def _callback(self, header, data): | |
153 | self.log.debug("Received packet on %s" % self.dev) | |
154 | try: | |
155 | p = protocol.decode_packet(data) | |
156 | except PacketTypeError, e: | |
157 | self.log.error("Got unknown packet: %s" % e) | |
158 | return | |
159 | except DecodeError, e: | |
160 | self.log.warning("Got decoding error: %s" % e) | |
161 | return | |
162 | ||
163 | # Dump packet information | |
164 | for key, val in p.items(): | |
165 | self.log.debug(" %s: %s" % (key, val)) | |
166 | ||
54e92b60 | 167 | self._handlePacket(p) |
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168 | |
169 | def run(self): | |
170 | self.log.info("Starting interface %s" % self.dev) | |
171 | ||
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172 | util.setprocname("interface %s" % self.dev) |
173 | ||
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174 | p = pcapy.open_live(self.dev, self.mtu, self.promisc, 0) |
175 | p.setfilter(self.filter) | |
176 | #p.loop(0, self._callback) | |
177 | ||
178 | p.setnonblock(1) | |
179 | while True: | |
180 | if not self.__running: | |
53478050 MT |
181 | return |
182 | ||
183 | if p.dispatch(1, self._callback): | |
184 | continue | |
185 | ||
186 | time.sleep(self.heartbeat) | |
187 | ||
188 | def shutdown(self): | |
189 | if not self.__running: | |
190 | return | |
191 | ||
192 | self.log.debug("Sending shutdown signal to %s" % self.dev) | |
193 | self.__running = False | |
194 | ||
195 | @property | |
196 | def filter(self): | |
197 | return "arp or rarp" | |
198 | ||
ded2591d MT |
199 | def addEvent(self, event): |
200 | return self.cappie.queue.add(event) | |
53478050 | 201 | |
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202 | def _handlePacket(self, packet): |
203 | if packet.operation == OPERATION_RESPONSE: | |
204 | self.addEvent(EventResponseTrigger(self, packet)) | |
205 | #self.addEvent(EventCheckDuplicate(self, packet)) | |
53478050 | 206 | |
54e92b60 MT |
207 | elif packet.operation == OPERATION_REQUEST: |
208 | self.addEvent(EventRequestTrigger(self, packet)) |