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1 | 1f3139f3 | Apollon Oikonomopoulos | #!/usr/bin/env python |
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2 | 1f3139f3 | Apollon Oikonomopoulos | # |
3 | 1f3139f3 | Apollon Oikonomopoulos | |
4 | 1f3139f3 | Apollon Oikonomopoulos | # nfdcpd: A promiscuous, NFQUEUE-based DHCP server for virtual machine hosting |
5 | 1f3139f3 | Apollon Oikonomopoulos | # Copyright (c) 2010 GRNET SA |
6 | 1f3139f3 | Apollon Oikonomopoulos | # |
7 | 1f3139f3 | Apollon Oikonomopoulos | # This program is free software; you can redistribute it and/or modify |
8 | 1f3139f3 | Apollon Oikonomopoulos | # it under the terms of the GNU General Public License as published by |
9 | 1f3139f3 | Apollon Oikonomopoulos | # the Free Software Foundation; either version 2 of the License, or |
10 | 1f3139f3 | Apollon Oikonomopoulos | # (at your option) any later version. |
11 | 1f3139f3 | Apollon Oikonomopoulos | # |
12 | 1f3139f3 | Apollon Oikonomopoulos | # This program is distributed in the hope that it will be useful, |
13 | 1f3139f3 | Apollon Oikonomopoulos | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | 1f3139f3 | Apollon Oikonomopoulos | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | 1f3139f3 | Apollon Oikonomopoulos | # GNU General Public License for more details. |
16 | 1f3139f3 | Apollon Oikonomopoulos | # |
17 | 1f3139f3 | Apollon Oikonomopoulos | # You should have received a copy of the GNU General Public License along |
18 | 1f3139f3 | Apollon Oikonomopoulos | # with this program; if not, write to the Free Software Foundation, Inc., |
19 | 1f3139f3 | Apollon Oikonomopoulos | # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
20 | 1f3139f3 | Apollon Oikonomopoulos | # |
21 | 1f3139f3 | Apollon Oikonomopoulos | |
22 | 1f3139f3 | Apollon Oikonomopoulos | import os |
23 | 1f3139f3 | Apollon Oikonomopoulos | import re |
24 | 1f3139f3 | Apollon Oikonomopoulos | import glob |
25 | fa04d422 | Apollon Oikonomopoulos | import time |
26 | 1f3139f3 | Apollon Oikonomopoulos | import logging |
27 | 1f3139f3 | Apollon Oikonomopoulos | import logging.handlers |
28 | 83027c6b | Apollon Oikonomopoulos | import threading |
29 | 1f3139f3 | Apollon Oikonomopoulos | import subprocess |
30 | 1f3139f3 | Apollon Oikonomopoulos | |
31 | 1f3139f3 | Apollon Oikonomopoulos | import daemon |
32 | 1f3139f3 | Apollon Oikonomopoulos | import nfqueue |
33 | 1f3139f3 | Apollon Oikonomopoulos | import pyinotify |
34 | 1f3139f3 | Apollon Oikonomopoulos | |
35 | 1f3139f3 | Apollon Oikonomopoulos | import IPy |
36 | 1f3139f3 | Apollon Oikonomopoulos | from select import select |
37 | 699cc6e3 | Apollon Oikonomopoulos | from socket import AF_INET, AF_INET6 |
38 | 1f3139f3 | Apollon Oikonomopoulos | |
39 | 1f3139f3 | Apollon Oikonomopoulos | from scapy.layers.l2 import Ether |
40 | 1f3139f3 | Apollon Oikonomopoulos | from scapy.layers.inet import IP, UDP |
41 | 699cc6e3 | Apollon Oikonomopoulos | from scapy.layers.inet6 import * |
42 | 1f3139f3 | Apollon Oikonomopoulos | from scapy.layers.dhcp import BOOTP, DHCP |
43 | 1f3139f3 | Apollon Oikonomopoulos | from scapy.sendrecv import sendp |
44 | 1f3139f3 | Apollon Oikonomopoulos | |
45 | ea915b1a | Apollon Oikonomopoulos | DEFAULT_CONFIG = "/etc/nfdhcpd/nfdhcpd.conf" |
46 | 1f3139f3 | Apollon Oikonomopoulos | DEFAULT_PATH = "/var/run/ganeti-dhcpd" |
47 | 1f3139f3 | Apollon Oikonomopoulos | DEFAULT_USER = "nobody" |
48 | ea915b1a | Apollon Oikonomopoulos | DEFAULT_LEASE_LIFETIME = 604800 # 1 week |
49 | ea915b1a | Apollon Oikonomopoulos | DEFAULT_LEASE_RENEWAL = 600 # 10 min |
50 | ea915b1a | Apollon Oikonomopoulos | DEFAULT_RA_PERIOD = 300 # seconds |
51 | ea915b1a | Apollon Oikonomopoulos | DHCP_DUMMY_SERVER_IP = "1.2.3.4" |
52 | 1f3139f3 | Apollon Oikonomopoulos | |
53 | ea915b1a | Apollon Oikonomopoulos | LOG_FILENAME = "nfdhcpd.log" |
54 | 1f3139f3 | Apollon Oikonomopoulos | |
55 | 1f3139f3 | Apollon Oikonomopoulos | SYSFS_NET = "/sys/class/net" |
56 | 1f3139f3 | Apollon Oikonomopoulos | |
57 | 1f3139f3 | Apollon Oikonomopoulos | LOG_FORMAT = "%(asctime)-15s %(levelname)-6s %(message)s" |
58 | 1f3139f3 | Apollon Oikonomopoulos | |
59 | 651e531d | Apollon Oikonomopoulos | # Configuration file specification (see configobj documentation) |
60 | 651e531d | Apollon Oikonomopoulos | CONFIG_SPEC = """ |
61 | 651e531d | Apollon Oikonomopoulos | [general] |
62 | 651e531d | Apollon Oikonomopoulos | pidfile = string() |
63 | 651e531d | Apollon Oikonomopoulos | datapath = string() |
64 | 651e531d | Apollon Oikonomopoulos | logdir = string() |
65 | 651e531d | Apollon Oikonomopoulos | user = string() |
66 | 651e531d | Apollon Oikonomopoulos | |
67 | 651e531d | Apollon Oikonomopoulos | [dhcp] |
68 | 651e531d | Apollon Oikonomopoulos | enable_dhcp = boolean(default=True) |
69 | 651e531d | Apollon Oikonomopoulos | lease_lifetime = integer(min=0, max=4294967295) |
70 | 651e531d | Apollon Oikonomopoulos | lease_renewal = integer(min=0, max=4294967295) |
71 | 651e531d | Apollon Oikonomopoulos | server_ip = ip_addr() |
72 | 651e531d | Apollon Oikonomopoulos | dhcp_queue = integer(min=0, max=65535) |
73 | 651e531d | Apollon Oikonomopoulos | nameservers = ip_addr_list(family=4) |
74 | 651e531d | Apollon Oikonomopoulos | |
75 | 651e531d | Apollon Oikonomopoulos | [ipv6] |
76 | 651e531d | Apollon Oikonomopoulos | enable_ipv6 = boolean(default=True) |
77 | 651e531d | Apollon Oikonomopoulos | ra_period = integer(min=1, max=4294967295) |
78 | 651e531d | Apollon Oikonomopoulos | rs_queue = integer(min=0, max=65535) |
79 | 651e531d | Apollon Oikonomopoulos | ns_queue = integer(min=0, max=65535) |
80 | 651e531d | Apollon Oikonomopoulos | nameservers = ip_addr_list(family=6) |
81 | 651e531d | Apollon Oikonomopoulos | """ |
82 | 651e531d | Apollon Oikonomopoulos | |
83 | 651e531d | Apollon Oikonomopoulos | |
84 | 1f3139f3 | Apollon Oikonomopoulos | DHCPDISCOVER = 1 |
85 | 1f3139f3 | Apollon Oikonomopoulos | DHCPOFFER = 2 |
86 | 1f3139f3 | Apollon Oikonomopoulos | DHCPREQUEST = 3 |
87 | 1f3139f3 | Apollon Oikonomopoulos | DHCPDECLINE = 4 |
88 | 1f3139f3 | Apollon Oikonomopoulos | DHCPACK = 5 |
89 | 1f3139f3 | Apollon Oikonomopoulos | DHCPNAK = 6 |
90 | 1f3139f3 | Apollon Oikonomopoulos | DHCPRELEASE = 7 |
91 | 1f3139f3 | Apollon Oikonomopoulos | DHCPINFORM = 8 |
92 | 1f3139f3 | Apollon Oikonomopoulos | |
93 | 1f3139f3 | Apollon Oikonomopoulos | DHCP_TYPES = { |
94 | 1f3139f3 | Apollon Oikonomopoulos | DHCPDISCOVER: "DHCPDISCOVER", |
95 | 1f3139f3 | Apollon Oikonomopoulos | DHCPOFFER: "DHCPOFFER", |
96 | 1f3139f3 | Apollon Oikonomopoulos | DHCPREQUEST: "DHCPREQUEST", |
97 | 1f3139f3 | Apollon Oikonomopoulos | DHCPDECLINE: "DHCPDECLINE", |
98 | 1f3139f3 | Apollon Oikonomopoulos | DHCPACK: "DHCPACK", |
99 | 1f3139f3 | Apollon Oikonomopoulos | DHCPNAK: "DHCPNAK", |
100 | 1f3139f3 | Apollon Oikonomopoulos | DHCPRELEASE: "DHCPRELEASE", |
101 | 1f3139f3 | Apollon Oikonomopoulos | DHCPINFORM: "DHCPINFORM", |
102 | 1f3139f3 | Apollon Oikonomopoulos | } |
103 | 1f3139f3 | Apollon Oikonomopoulos | |
104 | 1f3139f3 | Apollon Oikonomopoulos | DHCP_REQRESP = { |
105 | 1f3139f3 | Apollon Oikonomopoulos | DHCPDISCOVER: DHCPOFFER, |
106 | 1f3139f3 | Apollon Oikonomopoulos | DHCPREQUEST: DHCPACK, |
107 | 1f3139f3 | Apollon Oikonomopoulos | DHCPINFORM: DHCPACK, |
108 | 1f3139f3 | Apollon Oikonomopoulos | } |
109 | 1f3139f3 | Apollon Oikonomopoulos | |
110 | 519ec23c | Apollon Oikonomopoulos | |
111 | 699cc6e3 | Apollon Oikonomopoulos | class ClientFileHandler(pyinotify.ProcessEvent): |
112 | 699cc6e3 | Apollon Oikonomopoulos | def __init__(self, server): |
113 | 1f3139f3 | Apollon Oikonomopoulos | pyinotify.ProcessEvent.__init__(self) |
114 | 699cc6e3 | Apollon Oikonomopoulos | self.server = server |
115 | 1f3139f3 | Apollon Oikonomopoulos | |
116 | 1f3139f3 | Apollon Oikonomopoulos | def process_IN_DELETE(self, event): |
117 | 699cc6e3 | Apollon Oikonomopoulos | self.server.remove_iface(event.name) |
118 | 1f3139f3 | Apollon Oikonomopoulos | |
119 | 1f3139f3 | Apollon Oikonomopoulos | def process_IN_CLOSE_WRITE(self, event): |
120 | 699cc6e3 | Apollon Oikonomopoulos | self.server.add_iface(os.path.join(event.path, event.name)) |
121 | 1f3139f3 | Apollon Oikonomopoulos | |
122 | 699cc6e3 | Apollon Oikonomopoulos | |
123 | 699cc6e3 | Apollon Oikonomopoulos | class Client(object): |
124 | 1f3139f3 | Apollon Oikonomopoulos | def __init__(self, mac=None, ips=None, link=None, hostname=None): |
125 | 1f3139f3 | Apollon Oikonomopoulos | self.mac = mac |
126 | 1f3139f3 | Apollon Oikonomopoulos | self.ips = ips |
127 | 1f3139f3 | Apollon Oikonomopoulos | self.hostname = hostname |
128 | 1f3139f3 | Apollon Oikonomopoulos | self.link = link |
129 | 1f3139f3 | Apollon Oikonomopoulos | self.iface = None |
130 | 699cc6e3 | Apollon Oikonomopoulos | |
131 | 1f3139f3 | Apollon Oikonomopoulos | @property |
132 | 1f3139f3 | Apollon Oikonomopoulos | def ip(self): |
133 | 1f3139f3 | Apollon Oikonomopoulos | return self.ips[0] |
134 | 1f3139f3 | Apollon Oikonomopoulos | |
135 | 1f3139f3 | Apollon Oikonomopoulos | def is_valid(self): |
136 | 1f3139f3 | Apollon Oikonomopoulos | return self.mac is not None and self.ips is not None\ |
137 | 1f3139f3 | Apollon Oikonomopoulos | and self.hostname is not None |
138 | 1f3139f3 | Apollon Oikonomopoulos | |
139 | 1f3139f3 | Apollon Oikonomopoulos | |
140 | 1f3139f3 | Apollon Oikonomopoulos | class Subnet(object): |
141 | 1f3139f3 | Apollon Oikonomopoulos | def __init__(self, net=None, gw=None, dev=None): |
142 | 1f3139f3 | Apollon Oikonomopoulos | if isinstance(net, str): |
143 | 1f3139f3 | Apollon Oikonomopoulos | self.net = IPy.IP(net) |
144 | 1f3139f3 | Apollon Oikonomopoulos | else: |
145 | 1f3139f3 | Apollon Oikonomopoulos | self.net = net |
146 | 1f3139f3 | Apollon Oikonomopoulos | self.gw = gw |
147 | 1f3139f3 | Apollon Oikonomopoulos | self.dev = dev |
148 | 1f3139f3 | Apollon Oikonomopoulos | |
149 | 1f3139f3 | Apollon Oikonomopoulos | @property |
150 | 1f3139f3 | Apollon Oikonomopoulos | def netmask(self): |
151 | 1f3139f3 | Apollon Oikonomopoulos | return str(self.net.netmask()) |
152 | 1f3139f3 | Apollon Oikonomopoulos | |
153 | 1f3139f3 | Apollon Oikonomopoulos | @property |
154 | 1f3139f3 | Apollon Oikonomopoulos | def broadcast(self): |
155 | 1f3139f3 | Apollon Oikonomopoulos | return str(self.net.broadcast()) |
156 | 1f3139f3 | Apollon Oikonomopoulos | |
157 | 247ad61d | Apollon Oikonomopoulos | @property |
158 | 247ad61d | Apollon Oikonomopoulos | def prefix(self): |
159 | 247ad61d | Apollon Oikonomopoulos | return self.net.net() |
160 | 247ad61d | Apollon Oikonomopoulos | |
161 | 247ad61d | Apollon Oikonomopoulos | @property |
162 | 247ad61d | Apollon Oikonomopoulos | def prefixlen(self): |
163 | 247ad61d | Apollon Oikonomopoulos | return self.net.prefixlen() |
164 | 247ad61d | Apollon Oikonomopoulos | |
165 | 247ad61d | Apollon Oikonomopoulos | @staticmethod |
166 | 247ad61d | Apollon Oikonomopoulos | def _make_eui64(net, mac): |
167 | 247ad61d | Apollon Oikonomopoulos | """ Compute an EUI-64 address from an EUI-48 (MAC) address |
168 | 247ad61d | Apollon Oikonomopoulos | |
169 | 247ad61d | Apollon Oikonomopoulos | """ |
170 | 247ad61d | Apollon Oikonomopoulos | comp = mac.split(":") |
171 | 247ad61d | Apollon Oikonomopoulos | prefix = IPy.IP(net).net().strFullsize().split(":")[:4] |
172 | 247ad61d | Apollon Oikonomopoulos | eui64 = comp[:3] + ["ff", "fe"] + comp[3:] |
173 | 247ad61d | Apollon Oikonomopoulos | eui64[0] = "%02x" % (int(eui64[0], 16) ^ 0x02) |
174 | 247ad61d | Apollon Oikonomopoulos | for l in range(0, len(eui64), 2): |
175 | 247ad61d | Apollon Oikonomopoulos | prefix += ["".join(eui64[l:l+2])] |
176 | 247ad61d | Apollon Oikonomopoulos | return IPy.IP(":".join(prefix)) |
177 | 247ad61d | Apollon Oikonomopoulos | |
178 | 247ad61d | Apollon Oikonomopoulos | def make_eui64(self, mac): |
179 | 247ad61d | Apollon Oikonomopoulos | return self._make_eui64(self.net, mac) |
180 | 247ad61d | Apollon Oikonomopoulos | |
181 | 247ad61d | Apollon Oikonomopoulos | def make_ll64(self, mac): |
182 | 247ad61d | Apollon Oikonomopoulos | return self._make_eui64("fe80::", mac) |
183 | 247ad61d | Apollon Oikonomopoulos | |
184 | 1f3139f3 | Apollon Oikonomopoulos | |
185 | 699cc6e3 | Apollon Oikonomopoulos | class VMNetProxy(object): |
186 | 699cc6e3 | Apollon Oikonomopoulos | def __init__(self, data_path, dhcp_queue_num=None, |
187 | ea915b1a | Apollon Oikonomopoulos | rs_queue_num=None, ns_queue_num=None, |
188 | ea915b1a | Apollon Oikonomopoulos | dhcp_lease_lifetime=DEFAULT_LEASE_LIFETIME, |
189 | ea915b1a | Apollon Oikonomopoulos | dhcp_lease_renewal=DEFAULT_LEASE_RENEWAL, |
190 | ea915b1a | Apollon Oikonomopoulos | dhcp_server_ip=DHCP_DUMMY_SERVER_IP, dhcp_nameservers = [], |
191 | ea915b1a | Apollon Oikonomopoulos | ra_period=DEFAULT_RA_PERIOD, ipv6_nameservers = []): |
192 | ea915b1a | Apollon Oikonomopoulos | |
193 | 1f3139f3 | Apollon Oikonomopoulos | self.data_path = data_path |
194 | ea915b1a | Apollon Oikonomopoulos | self.lease_lifetime = dhcp_lease_lifetime |
195 | ea915b1a | Apollon Oikonomopoulos | self.lease_renewal = dhcp_lease_renewal |
196 | ea915b1a | Apollon Oikonomopoulos | self.dhcp_server_ip = dhcp_server_ip |
197 | ea915b1a | Apollon Oikonomopoulos | self.ra_period = ra_period |
198 | ea915b1a | Apollon Oikonomopoulos | self.dhcp_nameservers = dhcp_nameservers |
199 | ea915b1a | Apollon Oikonomopoulos | self.ipv6_nameservers = ipv6_nameservers |
200 | ea915b1a | Apollon Oikonomopoulos | |
201 | 1f3139f3 | Apollon Oikonomopoulos | self.clients = {} |
202 | 1f3139f3 | Apollon Oikonomopoulos | self.subnets = {} |
203 | 1f3139f3 | Apollon Oikonomopoulos | self.ifaces = {} |
204 | 247ad61d | Apollon Oikonomopoulos | self.v6nets = {} |
205 | 699cc6e3 | Apollon Oikonomopoulos | self.nfq = {} |
206 | 699cc6e3 | Apollon Oikonomopoulos | |
207 | 1f3139f3 | Apollon Oikonomopoulos | # Inotify setup |
208 | 1f3139f3 | Apollon Oikonomopoulos | self.wm = pyinotify.WatchManager() |
209 | 1f3139f3 | Apollon Oikonomopoulos | mask = pyinotify.EventsCodes.ALL_FLAGS["IN_DELETE"] |
210 | 1f3139f3 | Apollon Oikonomopoulos | mask |= pyinotify.EventsCodes.ALL_FLAGS["IN_CLOSE_WRITE"] |
211 | 699cc6e3 | Apollon Oikonomopoulos | handler = ClientFileHandler(self) |
212 | 1f3139f3 | Apollon Oikonomopoulos | self.notifier = pyinotify.Notifier(self.wm, handler) |
213 | 1f3139f3 | Apollon Oikonomopoulos | self.wm.add_watch(self.data_path, mask, rec=True) |
214 | 1f3139f3 | Apollon Oikonomopoulos | |
215 | 699cc6e3 | Apollon Oikonomopoulos | # NFQUEUE setup |
216 | 699cc6e3 | Apollon Oikonomopoulos | if dhcp_queue_num is not None: |
217 | 699cc6e3 | Apollon Oikonomopoulos | self._setup_nfqueue(dhcp_queue_num, AF_INET, self.dhcp_response) |
218 | 699cc6e3 | Apollon Oikonomopoulos | |
219 | 699cc6e3 | Apollon Oikonomopoulos | if rs_queue_num is not None: |
220 | 699cc6e3 | Apollon Oikonomopoulos | self._setup_nfqueue(rs_queue_num, AF_INET6, self.rs_response) |
221 | 699cc6e3 | Apollon Oikonomopoulos | |
222 | 699cc6e3 | Apollon Oikonomopoulos | if ns_queue_num is not None: |
223 | 699cc6e3 | Apollon Oikonomopoulos | self._setup_nfqueue(ns_queue_num, AF_INET6, self.ns_response) |
224 | 699cc6e3 | Apollon Oikonomopoulos | |
225 | 699cc6e3 | Apollon Oikonomopoulos | def _setup_nfqueue(self, queue_num, family, callback): |
226 | 247ad61d | Apollon Oikonomopoulos | logging.debug("Setting up NFQUEUE for queue %d, AF %s" % |
227 | 247ad61d | Apollon Oikonomopoulos | (queue_num, family)) |
228 | 699cc6e3 | Apollon Oikonomopoulos | q = nfqueue.queue() |
229 | 699cc6e3 | Apollon Oikonomopoulos | q.set_callback(callback) |
230 | 699cc6e3 | Apollon Oikonomopoulos | q.fast_open(queue_num, family) |
231 | 699cc6e3 | Apollon Oikonomopoulos | q.set_queue_maxlen(5000) |
232 | 1f3139f3 | Apollon Oikonomopoulos | # This is mandatory for the queue to operate |
233 | 699cc6e3 | Apollon Oikonomopoulos | q.set_mode(nfqueue.NFQNL_COPY_PACKET) |
234 | 699cc6e3 | Apollon Oikonomopoulos | self.nfq[q.get_fd()] = q |
235 | 1f3139f3 | Apollon Oikonomopoulos | |
236 | 1f3139f3 | Apollon Oikonomopoulos | def build_config(self): |
237 | 1f3139f3 | Apollon Oikonomopoulos | self.clients.clear() |
238 | 1f3139f3 | Apollon Oikonomopoulos | self.subnets.clear() |
239 | 1f3139f3 | Apollon Oikonomopoulos | |
240 | 1f3139f3 | Apollon Oikonomopoulos | for file in glob.glob(os.path.join(self.data_path, "*")): |
241 | 1f3139f3 | Apollon Oikonomopoulos | self.add_iface(file) |
242 | 1f3139f3 | Apollon Oikonomopoulos | |
243 | 1f3139f3 | Apollon Oikonomopoulos | def get_ifindex(self, iface): |
244 | 1f3139f3 | Apollon Oikonomopoulos | """ Get the interface index from sysfs |
245 | 1f3139f3 | Apollon Oikonomopoulos | |
246 | 1f3139f3 | Apollon Oikonomopoulos | """ |
247 | 1f3139f3 | Apollon Oikonomopoulos | file = os.path.abspath(os.path.join(SYSFS_NET, iface, "ifindex")) |
248 | 1f3139f3 | Apollon Oikonomopoulos | if not file.startswith(SYSFS_NET): |
249 | 1f3139f3 | Apollon Oikonomopoulos | return None |
250 | 1f3139f3 | Apollon Oikonomopoulos | |
251 | 1f3139f3 | Apollon Oikonomopoulos | ifindex = None |
252 | 1f3139f3 | Apollon Oikonomopoulos | |
253 | 1f3139f3 | Apollon Oikonomopoulos | try: |
254 | 1f3139f3 | Apollon Oikonomopoulos | f = open(file, 'r') |
255 | 1f3139f3 | Apollon Oikonomopoulos | ifindex = int(f.readline().strip()) |
256 | 1f3139f3 | Apollon Oikonomopoulos | f.close() |
257 | 6ca53b5c | Apollon Oikonomopoulos | except IOError: |
258 | 6ca53b5c | Apollon Oikonomopoulos | logging.debug("%s is down, removing" % iface) |
259 | 6ca53b5c | Apollon Oikonomopoulos | self.remove_iface(iface) |
260 | 1f3139f3 | Apollon Oikonomopoulos | |
261 | 1f3139f3 | Apollon Oikonomopoulos | return ifindex |
262 | 699cc6e3 | Apollon Oikonomopoulos | |
263 | 699cc6e3 | Apollon Oikonomopoulos | |
264 | 1f3139f3 | Apollon Oikonomopoulos | def get_iface_hw_addr(self, iface): |
265 | 1f3139f3 | Apollon Oikonomopoulos | """ Get the interface hardware address from sysfs |
266 | 1f3139f3 | Apollon Oikonomopoulos | |
267 | 1f3139f3 | Apollon Oikonomopoulos | """ |
268 | 1f3139f3 | Apollon Oikonomopoulos | file = os.path.abspath(os.path.join(SYSFS_NET, iface, "address")) |
269 | 1f3139f3 | Apollon Oikonomopoulos | if not file.startswith(SYSFS_NET): |
270 | 1f3139f3 | Apollon Oikonomopoulos | return None |
271 | 1f3139f3 | Apollon Oikonomopoulos | |
272 | 1f3139f3 | Apollon Oikonomopoulos | addr = None |
273 | 1f3139f3 | Apollon Oikonomopoulos | try: |
274 | 1f3139f3 | Apollon Oikonomopoulos | f = open(file, 'r') |
275 | 1f3139f3 | Apollon Oikonomopoulos | addr = f.readline().strip() |
276 | 1f3139f3 | Apollon Oikonomopoulos | f.close() |
277 | 6ca53b5c | Apollon Oikonomopoulos | except IOError: |
278 | 6ca53b5c | Apollon Oikonomopoulos | logging.debug("%s is down, removing" % iface) |
279 | 6ca53b5c | Apollon Oikonomopoulos | self.remove_iface(iface) |
280 | 6ca53b5c | Apollon Oikonomopoulos | |
281 | 1f3139f3 | Apollon Oikonomopoulos | return addr |
282 | 1f3139f3 | Apollon Oikonomopoulos | |
283 | 699cc6e3 | Apollon Oikonomopoulos | def parse_routing_table(self, table="main", family=4): |
284 | 1f3139f3 | Apollon Oikonomopoulos | """ Parse the given routing table to get connected route, gateway and |
285 | 1f3139f3 | Apollon Oikonomopoulos | default device. |
286 | 1f3139f3 | Apollon Oikonomopoulos | |
287 | 1f3139f3 | Apollon Oikonomopoulos | """ |
288 | 699cc6e3 | Apollon Oikonomopoulos | ipro = subprocess.Popen(["ip", "-%d" % family, "ro", "ls", |
289 | 699cc6e3 | Apollon Oikonomopoulos | "table", table], stdout=subprocess.PIPE) |
290 | 1f3139f3 | Apollon Oikonomopoulos | routes = ipro.stdout.readlines() |
291 | 699cc6e3 | Apollon Oikonomopoulos | |
292 | 1f3139f3 | Apollon Oikonomopoulos | def_gw = None |
293 | 1f3139f3 | Apollon Oikonomopoulos | def_dev = None |
294 | 1f3139f3 | Apollon Oikonomopoulos | def_net = None |
295 | 1f3139f3 | Apollon Oikonomopoulos | |
296 | 1f3139f3 | Apollon Oikonomopoulos | for route in routes: |
297 | 1f3139f3 | Apollon Oikonomopoulos | match = re.match(r'^default.*via ([^\s]+).*dev ([^\s]+)', route) |
298 | 1f3139f3 | Apollon Oikonomopoulos | if match: |
299 | 1f3139f3 | Apollon Oikonomopoulos | def_gw, def_dev = match.groups() |
300 | 1f3139f3 | Apollon Oikonomopoulos | break |
301 | 1f3139f3 | Apollon Oikonomopoulos | |
302 | 1f3139f3 | Apollon Oikonomopoulos | for route in routes: |
303 | 1f3139f3 | Apollon Oikonomopoulos | # Find the least-specific connected route |
304 | 1f3139f3 | Apollon Oikonomopoulos | try: |
305 | 1f3139f3 | Apollon Oikonomopoulos | def_net = re.match("^([^\\s]+) dev %s" % |
306 | 1f3139f3 | Apollon Oikonomopoulos | def_dev, route).groups()[0] |
307 | 1f3139f3 | Apollon Oikonomopoulos | def_net = IPy.IP(def_net) |
308 | 1f3139f3 | Apollon Oikonomopoulos | except: |
309 | 1f3139f3 | Apollon Oikonomopoulos | pass |
310 | 1f3139f3 | Apollon Oikonomopoulos | |
311 | 1f3139f3 | Apollon Oikonomopoulos | return Subnet(net=def_net, gw=def_gw, dev=def_dev) |
312 | 699cc6e3 | Apollon Oikonomopoulos | |
313 | 1f3139f3 | Apollon Oikonomopoulos | def parse_binding_file(self, path): |
314 | 1f3139f3 | Apollon Oikonomopoulos | """ Read a client configuration from a tap file |
315 | 1f3139f3 | Apollon Oikonomopoulos | |
316 | 1f3139f3 | Apollon Oikonomopoulos | """ |
317 | 1f3139f3 | Apollon Oikonomopoulos | try: |
318 | 1f3139f3 | Apollon Oikonomopoulos | iffile = open(path, 'r') |
319 | 1f3139f3 | Apollon Oikonomopoulos | except: |
320 | 1f3139f3 | Apollon Oikonomopoulos | return (None, None, None, None) |
321 | 1f3139f3 | Apollon Oikonomopoulos | mac = None |
322 | 1f3139f3 | Apollon Oikonomopoulos | ips = None |
323 | 1f3139f3 | Apollon Oikonomopoulos | link = None |
324 | 1f3139f3 | Apollon Oikonomopoulos | hostname = None |
325 | 1f3139f3 | Apollon Oikonomopoulos | |
326 | 1f3139f3 | Apollon Oikonomopoulos | for line in iffile: |
327 | 1f3139f3 | Apollon Oikonomopoulos | if line.startswith("IP="): |
328 | 1f3139f3 | Apollon Oikonomopoulos | ip = line.strip().split("=")[1] |
329 | 1f3139f3 | Apollon Oikonomopoulos | ips = ip.split() |
330 | 1f3139f3 | Apollon Oikonomopoulos | elif line.startswith("MAC="): |
331 | 1f3139f3 | Apollon Oikonomopoulos | mac = line.strip().split("=")[1] |
332 | 1f3139f3 | Apollon Oikonomopoulos | elif line.startswith("LINK="): |
333 | 1f3139f3 | Apollon Oikonomopoulos | link = line.strip().split("=")[1] |
334 | 1f3139f3 | Apollon Oikonomopoulos | elif line.startswith("HOSTNAME="): |
335 | 1f3139f3 | Apollon Oikonomopoulos | hostname = line.strip().split("=")[1] |
336 | 1f3139f3 | Apollon Oikonomopoulos | |
337 | 699cc6e3 | Apollon Oikonomopoulos | return Client(mac=mac, ips=ips, link=link, hostname=hostname) |
338 | 1f3139f3 | Apollon Oikonomopoulos | |
339 | 1f3139f3 | Apollon Oikonomopoulos | def add_iface(self, path): |
340 | 1f3139f3 | Apollon Oikonomopoulos | """ Add an interface to monitor |
341 | 1f3139f3 | Apollon Oikonomopoulos | |
342 | 1f3139f3 | Apollon Oikonomopoulos | """ |
343 | 1f3139f3 | Apollon Oikonomopoulos | iface = os.path.basename(path) |
344 | 1f3139f3 | Apollon Oikonomopoulos | |
345 | 1f3139f3 | Apollon Oikonomopoulos | logging.debug("Updating configuration for %s" % iface) |
346 | 1f3139f3 | Apollon Oikonomopoulos | binding = self.parse_binding_file(path) |
347 | 1f3139f3 | Apollon Oikonomopoulos | ifindex = self.get_ifindex(iface) |
348 | 1f3139f3 | Apollon Oikonomopoulos | |
349 | 1f3139f3 | Apollon Oikonomopoulos | if ifindex is None: |
350 | 1f3139f3 | Apollon Oikonomopoulos | logging.warn("Stale configuration for %s found" % iface) |
351 | 1f3139f3 | Apollon Oikonomopoulos | else: |
352 | 1f3139f3 | Apollon Oikonomopoulos | if binding.is_valid(): |
353 | 1f3139f3 | Apollon Oikonomopoulos | binding.iface = iface |
354 | 1f3139f3 | Apollon Oikonomopoulos | self.clients[binding.mac] = binding |
355 | 1f3139f3 | Apollon Oikonomopoulos | self.subnets[binding.link] = self.parse_routing_table( |
356 | 1f3139f3 | Apollon Oikonomopoulos | binding.link) |
357 | 1f3139f3 | Apollon Oikonomopoulos | logging.debug("Added client %s on %s" % |
358 | 1f3139f3 | Apollon Oikonomopoulos | (binding.hostname, iface)) |
359 | 1f3139f3 | Apollon Oikonomopoulos | self.ifaces[ifindex] = iface |
360 | 247ad61d | Apollon Oikonomopoulos | self.v6nets[iface] = self.parse_routing_table(binding.link, 6) |
361 | 1f3139f3 | Apollon Oikonomopoulos | |
362 | 1f3139f3 | Apollon Oikonomopoulos | def remove_iface(self, iface): |
363 | 1f3139f3 | Apollon Oikonomopoulos | """ Cleanup clients on a removed interface |
364 | 1f3139f3 | Apollon Oikonomopoulos | |
365 | 1f3139f3 | Apollon Oikonomopoulos | """ |
366 | 247ad61d | Apollon Oikonomopoulos | if iface in self.v6nets: |
367 | 6ca53b5c | Apollon Oikonomopoulos | del self.v6nets[iface] |
368 | 247ad61d | Apollon Oikonomopoulos | |
369 | 1f3139f3 | Apollon Oikonomopoulos | for mac in self.clients.keys(): |
370 | 1f3139f3 | Apollon Oikonomopoulos | if self.clients[mac].iface == iface: |
371 | 1f3139f3 | Apollon Oikonomopoulos | del self.clients[mac] |
372 | 1f3139f3 | Apollon Oikonomopoulos | |
373 | 1f3139f3 | Apollon Oikonomopoulos | for ifindex in self.ifaces.keys(): |
374 | 1f3139f3 | Apollon Oikonomopoulos | if self.ifaces[ifindex] == iface: |
375 | 1f3139f3 | Apollon Oikonomopoulos | del self.ifaces[ifindex] |
376 | 1f3139f3 | Apollon Oikonomopoulos | |
377 | 1f3139f3 | Apollon Oikonomopoulos | logging.debug("Removed interface %s" % iface) |
378 | 1f3139f3 | Apollon Oikonomopoulos | |
379 | 699cc6e3 | Apollon Oikonomopoulos | def dhcp_response(self, i, payload): |
380 | 1f3139f3 | Apollon Oikonomopoulos | """ Generate a reply to a BOOTP/DHCP request |
381 | 1f3139f3 | Apollon Oikonomopoulos | |
382 | 1f3139f3 | Apollon Oikonomopoulos | """ |
383 | 1f3139f3 | Apollon Oikonomopoulos | # Decode the response - NFQUEUE relays IP packets |
384 | 1f3139f3 | Apollon Oikonomopoulos | pkt = IP(payload.get_data()) |
385 | 1f3139f3 | Apollon Oikonomopoulos | |
386 | 1f3139f3 | Apollon Oikonomopoulos | # Get the actual interface from the ifindex |
387 | 1f3139f3 | Apollon Oikonomopoulos | iface = self.ifaces[payload.get_indev()] |
388 | 1f3139f3 | Apollon Oikonomopoulos | |
389 | 1f3139f3 | Apollon Oikonomopoulos | # Signal the kernel that it shouldn't further process the packet |
390 | 1f3139f3 | Apollon Oikonomopoulos | payload.set_verdict(nfqueue.NF_DROP) |
391 | 699cc6e3 | Apollon Oikonomopoulos | |
392 | 1f3139f3 | Apollon Oikonomopoulos | # Get the client MAC address |
393 | 1f3139f3 | Apollon Oikonomopoulos | resp = pkt.getlayer(BOOTP).copy() |
394 | 1f3139f3 | Apollon Oikonomopoulos | hlen = resp.hlen |
395 | 1f3139f3 | Apollon Oikonomopoulos | mac = resp.chaddr[:hlen].encode("hex") |
396 | 1f3139f3 | Apollon Oikonomopoulos | mac, _ = re.subn(r'([0-9a-fA-F]{2})', r'\1:', mac, hlen-1) |
397 | 1f3139f3 | Apollon Oikonomopoulos | |
398 | 1f3139f3 | Apollon Oikonomopoulos | # Server responses are always BOOTREPLYs |
399 | 1f3139f3 | Apollon Oikonomopoulos | resp.op = "BOOTREPLY" |
400 | 1f3139f3 | Apollon Oikonomopoulos | del resp.payload |
401 | 1f3139f3 | Apollon Oikonomopoulos | |
402 | 1f3139f3 | Apollon Oikonomopoulos | try: |
403 | 1f3139f3 | Apollon Oikonomopoulos | binding = self.clients[mac] |
404 | 1f3139f3 | Apollon Oikonomopoulos | except KeyError: |
405 | 1f3139f3 | Apollon Oikonomopoulos | logging.warn("Invalid client %s on %s" % (mac, iface)) |
406 | 1f3139f3 | Apollon Oikonomopoulos | return |
407 | 1f3139f3 | Apollon Oikonomopoulos | |
408 | 1f3139f3 | Apollon Oikonomopoulos | if iface != binding.iface: |
409 | 1f3139f3 | Apollon Oikonomopoulos | logging.warn("Received spoofed DHCP request for %s from interface" |
410 | 1f3139f3 | Apollon Oikonomopoulos | " %s instead of %s" % |
411 | 1f3139f3 | Apollon Oikonomopoulos | (mac, iface, binding.iface)) |
412 | 1f3139f3 | Apollon Oikonomopoulos | return |
413 | 1f3139f3 | Apollon Oikonomopoulos | |
414 | 1f3139f3 | Apollon Oikonomopoulos | resp = Ether(dst=mac, src=self.get_iface_hw_addr(iface))/\ |
415 | 699cc6e3 | Apollon Oikonomopoulos | IP(src=DHCP_DUMMY_SERVER_IP, dst=binding.ip)/\ |
416 | 1f3139f3 | Apollon Oikonomopoulos | UDP(sport=pkt.dport, dport=pkt.sport)/resp |
417 | 1f3139f3 | Apollon Oikonomopoulos | subnet = self.subnets[binding.link] |
418 | 1f3139f3 | Apollon Oikonomopoulos | |
419 | 1f3139f3 | Apollon Oikonomopoulos | if not DHCP in pkt: |
420 | 1f3139f3 | Apollon Oikonomopoulos | logging.warn("Invalid request from %s on %s, no DHCP" |
421 | 1f3139f3 | Apollon Oikonomopoulos | " payload found" % (binding.mac, iface)) |
422 | 1f3139f3 | Apollon Oikonomopoulos | return |
423 | 1f3139f3 | Apollon Oikonomopoulos | |
424 | 1f3139f3 | Apollon Oikonomopoulos | dhcp_options = [] |
425 | 1f3139f3 | Apollon Oikonomopoulos | requested_addr = binding.ip |
426 | 1f3139f3 | Apollon Oikonomopoulos | for opt in pkt[DHCP].options: |
427 | 1f3139f3 | Apollon Oikonomopoulos | if type(opt) is tuple and opt[0] == "message-type": |
428 | 1f3139f3 | Apollon Oikonomopoulos | req_type = opt[1] |
429 | 1f3139f3 | Apollon Oikonomopoulos | if type(opt) is tuple and opt[0] == "requested_addr": |
430 | 1f3139f3 | Apollon Oikonomopoulos | requested_addr = opt[1] |
431 | 1f3139f3 | Apollon Oikonomopoulos | |
432 | 1f3139f3 | Apollon Oikonomopoulos | logging.info("%s from %s on %s" % |
433 | 1f3139f3 | Apollon Oikonomopoulos | (DHCP_TYPES.get(req_type, "UNKNOWN"), binding.mac, iface)) |
434 | 1f3139f3 | Apollon Oikonomopoulos | |
435 | 1f3139f3 | Apollon Oikonomopoulos | if req_type == DHCPREQUEST and requested_addr != binding.ip: |
436 | 1f3139f3 | Apollon Oikonomopoulos | resp_type = DHCPNAK |
437 | 1f3139f3 | Apollon Oikonomopoulos | logging.info("Sending DHCPNAK to %s on %s: requested %s" |
438 | 1f3139f3 | Apollon Oikonomopoulos | " instead of %s" % |
439 | 1f3139f3 | Apollon Oikonomopoulos | (binding.mac, iface, requested_addr, binding.ip)) |
440 | 1f3139f3 | Apollon Oikonomopoulos | |
441 | 1f3139f3 | Apollon Oikonomopoulos | elif req_type in (DHCPDISCOVER, DHCPREQUEST): |
442 | 1f3139f3 | Apollon Oikonomopoulos | resp_type = DHCP_REQRESP[req_type] |
443 | 1f3139f3 | Apollon Oikonomopoulos | resp.yiaddr = self.clients[mac].ip |
444 | 1f3139f3 | Apollon Oikonomopoulos | dhcp_options += [ |
445 | 1f3139f3 | Apollon Oikonomopoulos | ("hostname", binding.hostname), |
446 | 1f3139f3 | Apollon Oikonomopoulos | ("domain", binding.hostname.split('.', 1)[-1]), |
447 | 1f3139f3 | Apollon Oikonomopoulos | ("router", subnet.gw), |
448 | 1f3139f3 | Apollon Oikonomopoulos | ("name_server", "194.177.210.10"), |
449 | 1f3139f3 | Apollon Oikonomopoulos | ("name_server", "194.177.210.211"), |
450 | 1f3139f3 | Apollon Oikonomopoulos | ("broadcast_address", str(subnet.broadcast)), |
451 | 1f3139f3 | Apollon Oikonomopoulos | ("subnet_mask", str(subnet.netmask)), |
452 | ea915b1a | Apollon Oikonomopoulos | ("renewal_time", self.lease_renewal), |
453 | ea915b1a | Apollon Oikonomopoulos | ("lease_time", self.lease_lifetime), |
454 | 1f3139f3 | Apollon Oikonomopoulos | ] |
455 | 1f3139f3 | Apollon Oikonomopoulos | |
456 | 1f3139f3 | Apollon Oikonomopoulos | elif req_type == DHCPINFORM: |
457 | 1f3139f3 | Apollon Oikonomopoulos | resp_type = DHCP_REQRESP[req_type] |
458 | 1f3139f3 | Apollon Oikonomopoulos | dhcp_options += [ |
459 | 1f3139f3 | Apollon Oikonomopoulos | ("hostname", binding.hostname), |
460 | 1f3139f3 | Apollon Oikonomopoulos | ("domain", binding.hostname.split('.', 1)[-1]), |
461 | 1f3139f3 | Apollon Oikonomopoulos | ("name_server", "194.177.210.10"), |
462 | 1f3139f3 | Apollon Oikonomopoulos | ("name_server", "194.177.210.211"), |
463 | 1f3139f3 | Apollon Oikonomopoulos | ] |
464 | 1f3139f3 | Apollon Oikonomopoulos | |
465 | 1f3139f3 | Apollon Oikonomopoulos | elif req_type == DHCPRELEASE: |
466 | 1f3139f3 | Apollon Oikonomopoulos | # Log and ignore |
467 | 1f3139f3 | Apollon Oikonomopoulos | logging.info("DHCPRELEASE from %s on %s" % |
468 | 1f3139f3 | Apollon Oikonomopoulos | (binding.mac, iface)) |
469 | 1f3139f3 | Apollon Oikonomopoulos | return |
470 | 1f3139f3 | Apollon Oikonomopoulos | |
471 | 1f3139f3 | Apollon Oikonomopoulos | # Finally, always add the server identifier and end options |
472 | 1f3139f3 | Apollon Oikonomopoulos | dhcp_options += [ |
473 | 1f3139f3 | Apollon Oikonomopoulos | ("message-type", resp_type), |
474 | 699cc6e3 | Apollon Oikonomopoulos | ("server_id", DHCP_DUMMY_SERVER_IP), |
475 | 1f3139f3 | Apollon Oikonomopoulos | "end" |
476 | 1f3139f3 | Apollon Oikonomopoulos | ] |
477 | 1f3139f3 | Apollon Oikonomopoulos | resp /= DHCP(options=dhcp_options) |
478 | 1f3139f3 | Apollon Oikonomopoulos | |
479 | 1f3139f3 | Apollon Oikonomopoulos | logging.info("%s to %s (%s) on %s" % |
480 | 1f3139f3 | Apollon Oikonomopoulos | (DHCP_TYPES[resp_type], mac, binding.ip, iface)) |
481 | 1f3139f3 | Apollon Oikonomopoulos | sendp(resp, iface=iface, verbose=False) |
482 | 1f3139f3 | Apollon Oikonomopoulos | |
483 | 247ad61d | Apollon Oikonomopoulos | def rs_response(self, i, payload): |
484 | 247ad61d | Apollon Oikonomopoulos | """ Generate a reply to a BOOTP/DHCP request |
485 | 247ad61d | Apollon Oikonomopoulos | |
486 | 247ad61d | Apollon Oikonomopoulos | """ |
487 | 247ad61d | Apollon Oikonomopoulos | # Get the actual interface from the ifindex |
488 | 247ad61d | Apollon Oikonomopoulos | iface = self.ifaces[payload.get_indev()] |
489 | 247ad61d | Apollon Oikonomopoulos | ifmac = self.get_iface_hw_addr(iface) |
490 | 247ad61d | Apollon Oikonomopoulos | subnet = self.v6nets[iface] |
491 | 247ad61d | Apollon Oikonomopoulos | ifll = subnet.make_ll64(ifmac) |
492 | 247ad61d | Apollon Oikonomopoulos | |
493 | 247ad61d | Apollon Oikonomopoulos | # Signal the kernel that it shouldn't further process the packet |
494 | 247ad61d | Apollon Oikonomopoulos | payload.set_verdict(nfqueue.NF_DROP) |
495 | 247ad61d | Apollon Oikonomopoulos | |
496 | 247ad61d | Apollon Oikonomopoulos | resp = Ether(src=self.get_iface_hw_addr(iface))/\ |
497 | 247ad61d | Apollon Oikonomopoulos | IPv6(src=str(ifll))/ICMPv6ND_RA(routerlifetime=14400)/\ |
498 | 247ad61d | Apollon Oikonomopoulos | ICMPv6NDOptPrefixInfo(prefix=str(subnet.prefix), |
499 | 247ad61d | Apollon Oikonomopoulos | prefixlen=subnet.prefixlen) |
500 | 247ad61d | Apollon Oikonomopoulos | |
501 | 247ad61d | Apollon Oikonomopoulos | logging.info("RA on %s for %s" % (iface, subnet.net)) |
502 | 247ad61d | Apollon Oikonomopoulos | sendp(resp, iface=iface, verbose=False) |
503 | 1f3139f3 | Apollon Oikonomopoulos | |
504 | a5c8c1fe | Apollon Oikonomopoulos | def ns_response(self, i, payload): |
505 | a5c8c1fe | Apollon Oikonomopoulos | """ Generate a reply to an ICMPv6 neighbor solicitation |
506 | a5c8c1fe | Apollon Oikonomopoulos | |
507 | a5c8c1fe | Apollon Oikonomopoulos | """ |
508 | a5c8c1fe | Apollon Oikonomopoulos | # Get the actual interface from the ifindex |
509 | a5c8c1fe | Apollon Oikonomopoulos | iface = self.ifaces[payload.get_indev()] |
510 | a5c8c1fe | Apollon Oikonomopoulos | ifmac = self.get_iface_hw_addr(iface) |
511 | a5c8c1fe | Apollon Oikonomopoulos | subnet = self.v6nets[iface] |
512 | a5c8c1fe | Apollon Oikonomopoulos | ifll = subnet.make_ll64(ifmac) |
513 | a5c8c1fe | Apollon Oikonomopoulos | |
514 | a5c8c1fe | Apollon Oikonomopoulos | ns = IPv6(payload.get_data()) |
515 | a5c8c1fe | Apollon Oikonomopoulos | |
516 | a5c8c1fe | Apollon Oikonomopoulos | if not (subnet.net.overlaps(ns.tgt) or str(ns.tgt) == str(ifll)): |
517 | a5c8c1fe | Apollon Oikonomopoulos | logging.debug("Received NS for a non-routable IP (%s)" % ns.tgt) |
518 | a5c8c1fe | Apollon Oikonomopoulos | payload.set_verdict(nfqueue.NF_ACCEPT) |
519 | a5c8c1fe | Apollon Oikonomopoulos | return 1 |
520 | a5c8c1fe | Apollon Oikonomopoulos | |
521 | a5c8c1fe | Apollon Oikonomopoulos | payload.set_verdict(nfqueue.NF_DROP) |
522 | a5c8c1fe | Apollon Oikonomopoulos | |
523 | 948d4918 | Apollon Oikonomopoulos | try: |
524 | 948d4918 | Apollon Oikonomopoulos | client_lladdr = ns.lladdr |
525 | 948d4918 | Apollon Oikonomopoulos | except AttributeError: |
526 | 948d4918 | Apollon Oikonomopoulos | return 1 |
527 | 948d4918 | Apollon Oikonomopoulos | |
528 | 948d4918 | Apollon Oikonomopoulos | resp = Ether(src=ifmac, dst=client_lladdr)/\ |
529 | a5c8c1fe | Apollon Oikonomopoulos | IPv6(src=str(ifll), dst=ns.src)/\ |
530 | a5c8c1fe | Apollon Oikonomopoulos | ICMPv6ND_NA(R=1, O=0, S=1, tgt=ns.tgt)/\ |
531 | a5c8c1fe | Apollon Oikonomopoulos | ICMPv6NDOptDstLLAddr(lladdr=ifmac) |
532 | a5c8c1fe | Apollon Oikonomopoulos | |
533 | a5c8c1fe | Apollon Oikonomopoulos | logging.info("NA on %s for %s" % (iface, ns.tgt)) |
534 | a5c8c1fe | Apollon Oikonomopoulos | sendp(resp, iface=iface, verbose=False) |
535 | a5c8c1fe | Apollon Oikonomopoulos | return 1 |
536 | a5c8c1fe | Apollon Oikonomopoulos | |
537 | fa04d422 | Apollon Oikonomopoulos | def send_periodic_ra(self): |
538 | 83027c6b | Apollon Oikonomopoulos | # Use a separate thread as this may take a _long_ time with |
539 | 83027c6b | Apollon Oikonomopoulos | # many interfaces and we want to be responsive in the mean time |
540 | 83027c6b | Apollon Oikonomopoulos | threading.Thread(target=self._send_periodic_ra).start() |
541 | 83027c6b | Apollon Oikonomopoulos | |
542 | 83027c6b | Apollon Oikonomopoulos | def _send_periodic_ra(self): |
543 | fa04d422 | Apollon Oikonomopoulos | logging.debug("Sending out periodic RAs") |
544 | 6ca53b5c | Apollon Oikonomopoulos | start = time.time() |
545 | 6ca53b5c | Apollon Oikonomopoulos | i = 0 |
546 | fa04d422 | Apollon Oikonomopoulos | for client in self.clients.values(): |
547 | fa04d422 | Apollon Oikonomopoulos | iface = client.iface |
548 | fa04d422 | Apollon Oikonomopoulos | ifmac = self.get_iface_hw_addr(iface) |
549 | 6ca53b5c | Apollon Oikonomopoulos | if not ifmac: |
550 | 6ca53b5c | Apollon Oikonomopoulos | continue |
551 | 6ca53b5c | Apollon Oikonomopoulos | |
552 | 6ca53b5c | Apollon Oikonomopoulos | subnet = self.v6nets[iface] |
553 | fa04d422 | Apollon Oikonomopoulos | ifll = subnet.make_ll64(ifmac) |
554 | fa04d422 | Apollon Oikonomopoulos | resp = Ether(src=ifmac)/\ |
555 | fa04d422 | Apollon Oikonomopoulos | IPv6(src=str(ifll))/ICMPv6ND_RA(routerlifetime=14400)/\ |
556 | fa04d422 | Apollon Oikonomopoulos | ICMPv6NDOptPrefixInfo(prefix=str(subnet.prefix), |
557 | fa04d422 | Apollon Oikonomopoulos | prefixlen=subnet.prefixlen) |
558 | fa04d422 | Apollon Oikonomopoulos | try: |
559 | fa04d422 | Apollon Oikonomopoulos | sendp(resp, iface=iface, verbose=False) |
560 | fa04d422 | Apollon Oikonomopoulos | except: |
561 | fa04d422 | Apollon Oikonomopoulos | logging.debug("Periodic RA on %s failed" % iface) |
562 | 6ca53b5c | Apollon Oikonomopoulos | i += 1 |
563 | 6ca53b5c | Apollon Oikonomopoulos | logging.debug("Sent %d RAs in %.2f seconds" % (i, time.time() - start)) |
564 | fa04d422 | Apollon Oikonomopoulos | |
565 | 1f3139f3 | Apollon Oikonomopoulos | def serve(self): |
566 | 1f3139f3 | Apollon Oikonomopoulos | """ Loop forever, serving DHCP requests |
567 | 1f3139f3 | Apollon Oikonomopoulos | |
568 | 1f3139f3 | Apollon Oikonomopoulos | """ |
569 | 1f3139f3 | Apollon Oikonomopoulos | self.build_config() |
570 | 1f3139f3 | Apollon Oikonomopoulos | |
571 | 1f3139f3 | Apollon Oikonomopoulos | iwfd = self.notifier._fd |
572 | 1f3139f3 | Apollon Oikonomopoulos | |
573 | f4b0c05f | Apollon Oikonomopoulos | start = time.time() |
574 | ea915b1a | Apollon Oikonomopoulos | timeout = self.ra_period |
575 | f4b0c05f | Apollon Oikonomopoulos | self.send_periodic_ra() |
576 | fa04d422 | Apollon Oikonomopoulos | |
577 | 1f3139f3 | Apollon Oikonomopoulos | while True: |
578 | fa04d422 | Apollon Oikonomopoulos | rlist, _, xlist = select(self.nfq.keys() + [iwfd], [], [], timeout) |
579 | bf84c4a5 | Apollon Oikonomopoulos | if xlist: |
580 | bf84c4a5 | Apollon Oikonomopoulos | logging.warn("Warning: Exception on %s" % |
581 | bf84c4a5 | Apollon Oikonomopoulos | ", ".join([ str(fd) for fd in xlist])) |
582 | bf84c4a5 | Apollon Oikonomopoulos | |
583 | 41a0f754 | Apollon Oikonomopoulos | if rlist: |
584 | f4b0c05f | Apollon Oikonomopoulos | if iwfd in rlist: |
585 | 41a0f754 | Apollon Oikonomopoulos | # First check if there are any inotify (= configuration change) |
586 | 41a0f754 | Apollon Oikonomopoulos | # events |
587 | f4b0c05f | Apollon Oikonomopoulos | self.notifier.read_events() |
588 | f4b0c05f | Apollon Oikonomopoulos | self.notifier.process_events() |
589 | f4b0c05f | Apollon Oikonomopoulos | rlist.remove(iwfd) |
590 | 1f3139f3 | Apollon Oikonomopoulos | |
591 | f4b0c05f | Apollon Oikonomopoulos | for fd in rlist: |
592 | bf84c4a5 | Apollon Oikonomopoulos | try: |
593 | bf84c4a5 | Apollon Oikonomopoulos | self.nfq[fd].process_pending() |
594 | bf84c4a5 | Apollon Oikonomopoulos | except e, msg: |
595 | bf84c4a5 | Apollon Oikonomopoulos | logging.warn("Error processing fd %d: %s" % (fd, e)) |
596 | 1f3139f3 | Apollon Oikonomopoulos | |
597 | fa04d422 | Apollon Oikonomopoulos | # Calculate the new timeout |
598 | ea915b1a | Apollon Oikonomopoulos | timeout = self.ra_period - (time.time() - start) |
599 | fa04d422 | Apollon Oikonomopoulos | |
600 | fa04d422 | Apollon Oikonomopoulos | if timeout <= 0: |
601 | 41a0f754 | Apollon Oikonomopoulos | start = time.time() |
602 | fa04d422 | Apollon Oikonomopoulos | self.send_periodic_ra() |
603 | ea915b1a | Apollon Oikonomopoulos | timeout = self.ra_period - (time.time() - start) |
604 | fa04d422 | Apollon Oikonomopoulos | |
605 | 1f3139f3 | Apollon Oikonomopoulos | |
606 | f4b0c05f | Apollon Oikonomopoulos | |
607 | 1f3139f3 | Apollon Oikonomopoulos | if __name__ == "__main__": |
608 | 1f3139f3 | Apollon Oikonomopoulos | import optparse |
609 | 651e531d | Apollon Oikonomopoulos | from cStringIO import StringIO |
610 | 1f3139f3 | Apollon Oikonomopoulos | from capng import * |
611 | 1f3139f3 | Apollon Oikonomopoulos | from pwd import getpwnam, getpwuid |
612 | 651e531d | Apollon Oikonomopoulos | from configobj import ConfigObj, flatten_errors |
613 | 651e531d | Apollon Oikonomopoulos | |
614 | 651e531d | Apollon Oikonomopoulos | import validate |
615 | 651e531d | Apollon Oikonomopoulos | |
616 | 651e531d | Apollon Oikonomopoulos | validator = validate.Validator() |
617 | 651e531d | Apollon Oikonomopoulos | |
618 | 651e531d | Apollon Oikonomopoulos | def is_ip_list(value, family=4): |
619 | 651e531d | Apollon Oikonomopoulos | try: |
620 | 651e531d | Apollon Oikonomopoulos | family = int(family) |
621 | 651e531d | Apollon Oikonomopoulos | except ValueError: |
622 | 651e531d | Apollon Oikonomopoulos | raise vaildate.VdtParamError(family) |
623 | 651e531d | Apollon Oikonomopoulos | if isinstance(value, (str, unicode)): |
624 | 651e531d | Apollon Oikonomopoulos | value = [value] |
625 | 651e531d | Apollon Oikonomopoulos | if not isinstance(value, list): |
626 | 651e531d | Apollon Oikonomopoulos | raise validate.VdtTypeError(value) |
627 | 651e531d | Apollon Oikonomopoulos | |
628 | 651e531d | Apollon Oikonomopoulos | for entry in value: |
629 | 651e531d | Apollon Oikonomopoulos | try: |
630 | 651e531d | Apollon Oikonomopoulos | ip = IPy.IP(entry) |
631 | 651e531d | Apollon Oikonomopoulos | except ValueError: |
632 | 651e531d | Apollon Oikonomopoulos | raise validate.VdtValueError(entry) |
633 | 651e531d | Apollon Oikonomopoulos | |
634 | 651e531d | Apollon Oikonomopoulos | if ip.version() != family: |
635 | 651e531d | Apollon Oikonomopoulos | raise validate.VdtValueError(entry) |
636 | 651e531d | Apollon Oikonomopoulos | return value |
637 | 651e531d | Apollon Oikonomopoulos | |
638 | 651e531d | Apollon Oikonomopoulos | validator.functions["ip_addr_list"] = is_ip_list |
639 | 651e531d | Apollon Oikonomopoulos | config_spec = StringIO(CONFIG_SPEC) |
640 | 651e531d | Apollon Oikonomopoulos | |
641 | 1f3139f3 | Apollon Oikonomopoulos | |
642 | 1f3139f3 | Apollon Oikonomopoulos | parser = optparse.OptionParser() |
643 | ea915b1a | Apollon Oikonomopoulos | parser.add_option("-c", "--config", dest="config_file", |
644 | ea915b1a | Apollon Oikonomopoulos | help="The location of the data files", metavar="FILE", |
645 | ea915b1a | Apollon Oikonomopoulos | default=DEFAULT_CONFIG) |
646 | 1f3139f3 | Apollon Oikonomopoulos | parser.add_option("-d", "--debug", action="store_true", dest="debug", |
647 | 1f3139f3 | Apollon Oikonomopoulos | help="Turn on debugging messages") |
648 | 1f3139f3 | Apollon Oikonomopoulos | parser.add_option("-f", "--foreground", action="store_false", dest="daemonize", |
649 | 1f3139f3 | Apollon Oikonomopoulos | default=True, help="Do not daemonize, stay in the foreground") |
650 | 1f3139f3 | Apollon Oikonomopoulos | |
651 | 1f3139f3 | Apollon Oikonomopoulos | |
652 | 1f3139f3 | Apollon Oikonomopoulos | opts, args = parser.parse_args() |
653 | 1f3139f3 | Apollon Oikonomopoulos | |
654 | 1f3139f3 | Apollon Oikonomopoulos | if opts.daemonize: |
655 | 1f3139f3 | Apollon Oikonomopoulos | d = daemon.DaemonContext() |
656 | 1f3139f3 | Apollon Oikonomopoulos | d.open() |
657 | 1f3139f3 | Apollon Oikonomopoulos | |
658 | ea915b1a | Apollon Oikonomopoulos | try: |
659 | 651e531d | Apollon Oikonomopoulos | config = ConfigObj(opts.config_file, configspec=config_spec) |
660 | ea915b1a | Apollon Oikonomopoulos | except: |
661 | ea915b1a | Apollon Oikonomopoulos | sys.stderr.write("Failed to parse config file %s" % opts.config_file) |
662 | ea915b1a | Apollon Oikonomopoulos | sys.exit(1) |
663 | ea915b1a | Apollon Oikonomopoulos | |
664 | 651e531d | Apollon Oikonomopoulos | results = config.validate(validator) |
665 | 651e531d | Apollon Oikonomopoulos | if results != True: |
666 | 651e531d | Apollon Oikonomopoulos | logging.fatal("Configuration file validation failed! See errors below:") |
667 | 651e531d | Apollon Oikonomopoulos | for (section_list, key, _) in flatten_errors(config, results): |
668 | 651e531d | Apollon Oikonomopoulos | if key is not None: |
669 | 651e531d | Apollon Oikonomopoulos | logging.fatal(" '%s' in section '%s' failed validation" % (key, ", ".join(section_list))) |
670 | 651e531d | Apollon Oikonomopoulos | else: |
671 | 651e531d | Apollon Oikonomopoulos | logging.fatal(" Section '%s' is missing" % ", ".join(section_list)) |
672 | 651e531d | Apollon Oikonomopoulos | sys.exit(1) |
673 | ea915b1a | Apollon Oikonomopoulos | |
674 | ea915b1a | Apollon Oikonomopoulos | pidfile = open(config["general"]["pidfile"], "w") |
675 | 1f3139f3 | Apollon Oikonomopoulos | pidfile.write("%s" % os.getpid()) |
676 | 1f3139f3 | Apollon Oikonomopoulos | pidfile.close() |
677 | 1f3139f3 | Apollon Oikonomopoulos | |
678 | 1f3139f3 | Apollon Oikonomopoulos | logger = logging.getLogger() |
679 | 1f3139f3 | Apollon Oikonomopoulos | if opts.debug: |
680 | 1f3139f3 | Apollon Oikonomopoulos | logger.setLevel(logging.DEBUG) |
681 | 1f3139f3 | Apollon Oikonomopoulos | else: |
682 | 1f3139f3 | Apollon Oikonomopoulos | logger.setLevel(logging.INFO) |
683 | 1f3139f3 | Apollon Oikonomopoulos | |
684 | 1f3139f3 | Apollon Oikonomopoulos | if opts.daemonize: |
685 | ea915b1a | Apollon Oikonomopoulos | logfile = os.path.join(config["general"]["logdir"], LOG_FILENAME) |
686 | ea915b1a | Apollon Oikonomopoulos | handler = logging.handlers.RotatingFileHandler(logfile, |
687 | 1f3139f3 | Apollon Oikonomopoulos | maxBytes=2097152) |
688 | 1f3139f3 | Apollon Oikonomopoulos | else: |
689 | 1f3139f3 | Apollon Oikonomopoulos | handler = logging.StreamHandler() |
690 | 1f3139f3 | Apollon Oikonomopoulos | |
691 | 1f3139f3 | Apollon Oikonomopoulos | handler.setFormatter(logging.Formatter(LOG_FORMAT)) |
692 | 1f3139f3 | Apollon Oikonomopoulos | logger.addHandler(handler) |
693 | 1f3139f3 | Apollon Oikonomopoulos | |
694 | 1f3139f3 | Apollon Oikonomopoulos | logging.info("Starting up") |
695 | ea915b1a | Apollon Oikonomopoulos | |
696 | ea915b1a | Apollon Oikonomopoulos | proxy_opts = {} |
697 | ea915b1a | Apollon Oikonomopoulos | if config["dhcp"].as_bool("enable_dhcp"): |
698 | ea915b1a | Apollon Oikonomopoulos | proxy_opts.update({ |
699 | ea915b1a | Apollon Oikonomopoulos | "dhcp_queue_num": config["dhcp"].as_int("dhcp_queue"), |
700 | ea915b1a | Apollon Oikonomopoulos | "dhcp_lease_lifetime": config["dhcp"].as_int("lease_lifetime"), |
701 | ea915b1a | Apollon Oikonomopoulos | "dhcp_lease_renewal": config["dhcp"].as_int("lease_renewal"), |
702 | ea915b1a | Apollon Oikonomopoulos | "dhcp_server_ip": config["dhcp"]["server_ip"], |
703 | ea915b1a | Apollon Oikonomopoulos | "dhcp_nameservers": config["dhcp"]["nameservers"], |
704 | ea915b1a | Apollon Oikonomopoulos | }) |
705 | ea915b1a | Apollon Oikonomopoulos | |
706 | ea915b1a | Apollon Oikonomopoulos | if config["ipv6"].as_bool("enable_ipv6"): |
707 | ea915b1a | Apollon Oikonomopoulos | proxy_opts.update({ |
708 | ea915b1a | Apollon Oikonomopoulos | "rs_queue_num": config["ipv6"].as_int("rs_queue"), |
709 | ea915b1a | Apollon Oikonomopoulos | "ns_queue_num": config["ipv6"].as_int("ns_queue"), |
710 | ea915b1a | Apollon Oikonomopoulos | "ra_period": config["ipv6"].as_int("ra_period"), |
711 | ea915b1a | Apollon Oikonomopoulos | "ipv6_nameservers": config["ipv6"]["nameservers"], |
712 | ea915b1a | Apollon Oikonomopoulos | }) |
713 | ea915b1a | Apollon Oikonomopoulos | |
714 | ea915b1a | Apollon Oikonomopoulos | proxy = VMNetProxy(data_path=config["general"]["datapath"], **proxy_opts) |
715 | 1f3139f3 | Apollon Oikonomopoulos | |
716 | 1f3139f3 | Apollon Oikonomopoulos | # Drop all capabilities except CAP_NET_RAW and change uid |
717 | 1f3139f3 | Apollon Oikonomopoulos | try: |
718 | ea915b1a | Apollon Oikonomopoulos | uid = getpwuid(config["general"].as_int("user")) |
719 | 1f3139f3 | Apollon Oikonomopoulos | except ValueError: |
720 | ea915b1a | Apollon Oikonomopoulos | uid = getpwnam(config["general"]["user"]) |
721 | 1f3139f3 | Apollon Oikonomopoulos | |
722 | 1f3139f3 | Apollon Oikonomopoulos | logging.info("Setting capabilities and changing uid") |
723 | 1f3139f3 | Apollon Oikonomopoulos | logging.debug("User: %s, uid: %d, gid: %d" % |
724 | ea915b1a | Apollon Oikonomopoulos | (config["general"]["user"], uid.pw_uid, uid.pw_gid)) |
725 | 1f3139f3 | Apollon Oikonomopoulos | capng_clear(CAPNG_SELECT_BOTH) |
726 | 1f3139f3 | Apollon Oikonomopoulos | capng_update(CAPNG_ADD, CAPNG_EFFECTIVE|CAPNG_PERMITTED, CAP_NET_RAW) |
727 | 1f3139f3 | Apollon Oikonomopoulos | capng_change_id(uid.pw_uid, uid.pw_gid, |
728 | 1f3139f3 | Apollon Oikonomopoulos | CAPNG_DROP_SUPP_GRP | CAPNG_CLEAR_BOUNDING) |
729 | 1f3139f3 | Apollon Oikonomopoulos | logging.info("Ready to serve requests") |
730 | 699cc6e3 | Apollon Oikonomopoulos | proxy.serve() |
731 | 1f3139f3 | Apollon Oikonomopoulos | |
732 | 1f3139f3 | Apollon Oikonomopoulos | |
733 | 1f3139f3 | Apollon Oikonomopoulos | # vim: set ts=4 sts=4 sw=4 et : |