]>
Commit | Line | Data |
---|---|---|
53478050 MT |
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 * | |
35 | ||
36 | def getAllInterfaces(): | |
37 | filters = ("lo", "any") | |
38 | ret = [] | |
39 | for dev in pcapy.findalldevs(): | |
40 | if not dev in filters: | |
41 | ret.append(dev) | |
42 | return ret | |
43 | ||
44 | class Cappie(object): | |
45 | def __init__(self): | |
46 | self.__interfaces = [] | |
47 | ||
48 | self.log = logging.getLogger("cappie") | |
49 | self.log.setLevel(logging.INFO) | |
50 | ||
51 | # Log to console | |
52 | handler = logging.StreamHandler() | |
53 | handler.setFormatter(logging.Formatter("%(levelname)7s %(message)s")) | |
54 | self.log.addHandler(handler) | |
55 | ||
56 | # Setup syslog | |
57 | handler = logging.handlers.SysLogHandler("/dev/log") | |
58 | handler.setFormatter(logging.Formatter("cappie: %(message)s")) | |
59 | self.log.addHandler(handler) | |
60 | ||
61 | self.queue = queue.Queue(self.log) | |
62 | ||
63 | self.log.info("Cappie successfully started") | |
64 | ||
65 | def __del__(self): | |
66 | self.shutdown() | |
67 | self.log.info("Exiting") | |
68 | ||
69 | def setDebug(self, debug): | |
70 | if debug: | |
71 | self.log.setLevel(logging.DEBUG) | |
72 | else: | |
73 | self.log.setLevel(logging.INFO) | |
74 | ||
75 | def addInterface(self, dev, **kwargs): | |
76 | if not dev in getAllInterfaces(): | |
77 | raise InterfaceError, "No such interface %s" % dev | |
78 | ||
79 | kwargs["cappie"] = self | |
80 | ||
81 | iface = Interface(dev, **kwargs) | |
82 | self.__interfaces.append(iface) | |
83 | ||
84 | def run(self): | |
85 | if not self.__interfaces: | |
86 | raise RuntimeError, "No interfaces were configured" | |
87 | ||
88 | # Start queue | |
89 | self.queue.start() | |
90 | ||
91 | # Start a thread for each interface | |
92 | for iface in self.__interfaces: | |
93 | iface.start() | |
94 | ||
95 | while True: | |
96 | if not self.queue.is_alive(): | |
97 | self.log.critical("Queue thread died unexpectedly.") | |
98 | return | |
99 | ||
100 | for iface in self.__interfaces: | |
101 | if not iface.is_alive(): | |
102 | self.log.critical("Thread died unexpectedly. %s" % iface.dev) | |
103 | return | |
104 | time.sleep(60) | |
105 | ||
106 | def readConfig(self, configfile): | |
107 | config = ConfigParser() | |
108 | config.read([configfile]) | |
109 | ||
110 | global_opts = {} | |
111 | if config.has_section("global"): | |
112 | for option, value in config.items("global"): | |
113 | global_opts[option] = value | |
114 | ||
115 | config.remove_section("global") | |
116 | ||
117 | for iface in config.sections(): | |
118 | options = {} | |
119 | for option, value in config.items(iface): | |
120 | options[option] = value | |
121 | self.addInterface(iface, **options) | |
122 | ||
123 | def shutdown(self): | |
124 | for iface in self.__interfaces: | |
125 | iface.shutdown() | |
126 | ||
127 | self.queue.shutdown() | |
128 | ||
129 | ||
130 | class Interface(Thread): | |
131 | heartbeat = 0.1 | |
132 | ||
133 | def __init__(self, dev, cappie, promisc=False, mtu=1500): | |
134 | Thread.__init__(self) | |
135 | ||
136 | self.cappie = cappie | |
137 | self.dev = dev | |
138 | self.log = self.cappie.log | |
139 | self.mtu = mtu | |
140 | self.promisc = promisc | |
141 | self.queue = self.cappie.queue | |
142 | ||
143 | self.db = Database(self) | |
144 | ||
145 | self.log.debug("Created new interface %s" % self.dev) | |
146 | ||
147 | self.__running = True | |
148 | ||
149 | def _callback(self, header, data): | |
150 | self.log.debug("Received packet on %s" % self.dev) | |
151 | try: | |
152 | p = protocol.decode_packet(data) | |
153 | except PacketTypeError, e: | |
154 | self.log.error("Got unknown packet: %s" % e) | |
155 | return | |
156 | except DecodeError, e: | |
157 | self.log.warning("Got decoding error: %s" % e) | |
158 | return | |
159 | ||
160 | # Dump packet information | |
161 | for key, val in p.items(): | |
162 | self.log.debug(" %s: %s" % (key, val)) | |
163 | ||
164 | if not self.db.has(p["source_address"]): | |
165 | self.db.put(p["source_address"], "SOURCE_IP_ADDRESS", p["source_ip_address"]) | |
166 | ||
167 | def run(self): | |
168 | self.log.info("Starting interface %s" % self.dev) | |
169 | ||
64e40ed0 MT |
170 | util.setprocname("interface %s" % self.dev) |
171 | ||
53478050 MT |
172 | self.db.open() |
173 | ||
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: | |
181 | self.db.close() | |
182 | return | |
183 | ||
184 | if p.dispatch(1, self._callback): | |
185 | continue | |
186 | ||
187 | time.sleep(self.heartbeat) | |
188 | ||
189 | def shutdown(self): | |
190 | if not self.__running: | |
191 | return | |
192 | ||
193 | self.log.debug("Sending shutdown signal to %s" % self.dev) | |
194 | self.__running = False | |
195 | ||
196 | @property | |
197 | def filter(self): | |
198 | return "arp or rarp" | |
199 | ||
200 | ||
201 | class Database(object): | |
202 | def __init__(self, interface): | |
203 | self.interface = interface | |
204 | self.dev = self.interface.dev | |
205 | self.log = self.interface.log | |
206 | ||
207 | self.__data = {} | |
208 | ||
209 | def open(self): | |
210 | self.log.debug("Opened database for %s" % self.dev) | |
211 | ||
212 | def close(self): | |
213 | self.log.debug("Closing database for %s" % self.dev) | |
214 | print self.__data | |
215 | ||
216 | def get(self, mac): | |
217 | if self.has(mac): | |
218 | return self.__data[mac] | |
219 | ||
220 | def has(self, mac): | |
221 | return self.__data.has_key(mac) | |
222 | ||
223 | def put(self, mac, key, val): | |
224 | if not self.has(mac): | |
225 | self.__data[mac] = {} | |
226 | ||
227 | # TODO Check key for sanity | |
228 | ||
229 | self.__data[mac][key] = val |