root / nfdhcpd @ 651e531d
History | View | Annotate | Download (23.2 kB)
1 |
#!/usr/bin/env python |
---|---|
2 |
# |
3 |
|
4 |
# nfdcpd: A promiscuous, NFQUEUE-based DHCP server for virtual machine hosting |
5 |
# Copyright (c) 2010 GRNET SA |
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 2 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 along |
18 |
# with this program; if not, write to the Free Software Foundation, Inc., |
19 |
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
20 |
# |
21 |
|
22 |
import os |
23 |
import re |
24 |
import glob |
25 |
import time |
26 |
import logging |
27 |
import logging.handlers |
28 |
import threading |
29 |
import subprocess |
30 |
|
31 |
import daemon |
32 |
import nfqueue |
33 |
import pyinotify |
34 |
|
35 |
import IPy |
36 |
from select import select |
37 |
from socket import AF_INET, AF_INET6 |
38 |
|
39 |
from scapy.layers.l2 import Ether |
40 |
from scapy.layers.inet import IP, UDP |
41 |
from scapy.layers.inet6 import * |
42 |
from scapy.layers.dhcp import BOOTP, DHCP |
43 |
from scapy.sendrecv import sendp |
44 |
|
45 |
DEFAULT_CONFIG = "/etc/nfdhcpd/nfdhcpd.conf" |
46 |
DEFAULT_PATH = "/var/run/ganeti-dhcpd" |
47 |
DEFAULT_USER = "nobody" |
48 |
DEFAULT_LEASE_LIFETIME = 604800 # 1 week |
49 |
DEFAULT_LEASE_RENEWAL = 600 # 10 min |
50 |
DEFAULT_RA_PERIOD = 300 # seconds |
51 |
DHCP_DUMMY_SERVER_IP = "1.2.3.4" |
52 |
|
53 |
LOG_FILENAME = "nfdhcpd.log" |
54 |
|
55 |
SYSFS_NET = "/sys/class/net" |
56 |
|
57 |
LOG_FORMAT = "%(asctime)-15s %(levelname)-6s %(message)s" |
58 |
|
59 |
# Configuration file specification (see configobj documentation) |
60 |
CONFIG_SPEC = """ |
61 |
[general] |
62 |
pidfile = string() |
63 |
datapath = string() |
64 |
logdir = string() |
65 |
user = string() |
66 |
|
67 |
[dhcp] |
68 |
enable_dhcp = boolean(default=True) |
69 |
lease_lifetime = integer(min=0, max=4294967295) |
70 |
lease_renewal = integer(min=0, max=4294967295) |
71 |
server_ip = ip_addr() |
72 |
dhcp_queue = integer(min=0, max=65535) |
73 |
nameservers = ip_addr_list(family=4) |
74 |
|
75 |
[ipv6] |
76 |
enable_ipv6 = boolean(default=True) |
77 |
ra_period = integer(min=1, max=4294967295) |
78 |
rs_queue = integer(min=0, max=65535) |
79 |
ns_queue = integer(min=0, max=65535) |
80 |
nameservers = ip_addr_list(family=6) |
81 |
""" |
82 |
|
83 |
|
84 |
DHCPDISCOVER = 1 |
85 |
DHCPOFFER = 2 |
86 |
DHCPREQUEST = 3 |
87 |
DHCPDECLINE = 4 |
88 |
DHCPACK = 5 |
89 |
DHCPNAK = 6 |
90 |
DHCPRELEASE = 7 |
91 |
DHCPINFORM = 8 |
92 |
|
93 |
DHCP_TYPES = { |
94 |
DHCPDISCOVER: "DHCPDISCOVER", |
95 |
DHCPOFFER: "DHCPOFFER", |
96 |
DHCPREQUEST: "DHCPREQUEST", |
97 |
DHCPDECLINE: "DHCPDECLINE", |
98 |
DHCPACK: "DHCPACK", |
99 |
DHCPNAK: "DHCPNAK", |
100 |
DHCPRELEASE: "DHCPRELEASE", |
101 |
DHCPINFORM: "DHCPINFORM", |
102 |
} |
103 |
|
104 |
DHCP_REQRESP = { |
105 |
DHCPDISCOVER: DHCPOFFER, |
106 |
DHCPREQUEST: DHCPACK, |
107 |
DHCPINFORM: DHCPACK, |
108 |
} |
109 |
|
110 |
|
111 |
class ClientFileHandler(pyinotify.ProcessEvent): |
112 |
def __init__(self, server): |
113 |
pyinotify.ProcessEvent.__init__(self) |
114 |
self.server = server |
115 |
|
116 |
def process_IN_DELETE(self, event): |
117 |
self.server.remove_iface(event.name) |
118 |
|
119 |
def process_IN_CLOSE_WRITE(self, event): |
120 |
self.server.add_iface(os.path.join(event.path, event.name)) |
121 |
|
122 |
|
123 |
class Client(object): |
124 |
def __init__(self, mac=None, ips=None, link=None, hostname=None): |
125 |
self.mac = mac |
126 |
self.ips = ips |
127 |
self.hostname = hostname |
128 |
self.link = link |
129 |
self.iface = None |
130 |
|
131 |
@property |
132 |
def ip(self): |
133 |
return self.ips[0] |
134 |
|
135 |
def is_valid(self): |
136 |
return self.mac is not None and self.ips is not None\ |
137 |
and self.hostname is not None |
138 |
|
139 |
|
140 |
class Subnet(object): |
141 |
def __init__(self, net=None, gw=None, dev=None): |
142 |
if isinstance(net, str): |
143 |
self.net = IPy.IP(net) |
144 |
else: |
145 |
self.net = net |
146 |
self.gw = gw |
147 |
self.dev = dev |
148 |
|
149 |
@property |
150 |
def netmask(self): |
151 |
return str(self.net.netmask()) |
152 |
|
153 |
@property |
154 |
def broadcast(self): |
155 |
return str(self.net.broadcast()) |
156 |
|
157 |
@property |
158 |
def prefix(self): |
159 |
return self.net.net() |
160 |
|
161 |
@property |
162 |
def prefixlen(self): |
163 |
return self.net.prefixlen() |
164 |
|
165 |
@staticmethod |
166 |
def _make_eui64(net, mac): |
167 |
""" Compute an EUI-64 address from an EUI-48 (MAC) address |
168 |
|
169 |
""" |
170 |
comp = mac.split(":") |
171 |
prefix = IPy.IP(net).net().strFullsize().split(":")[:4] |
172 |
eui64 = comp[:3] + ["ff", "fe"] + comp[3:] |
173 |
eui64[0] = "%02x" % (int(eui64[0], 16) ^ 0x02) |
174 |
for l in range(0, len(eui64), 2): |
175 |
prefix += ["".join(eui64[l:l+2])] |
176 |
return IPy.IP(":".join(prefix)) |
177 |
|
178 |
def make_eui64(self, mac): |
179 |
return self._make_eui64(self.net, mac) |
180 |
|
181 |
def make_ll64(self, mac): |
182 |
return self._make_eui64("fe80::", mac) |
183 |
|
184 |
|
185 |
class VMNetProxy(object): |
186 |
def __init__(self, data_path, dhcp_queue_num=None, |
187 |
rs_queue_num=None, ns_queue_num=None, |
188 |
dhcp_lease_lifetime=DEFAULT_LEASE_LIFETIME, |
189 |
dhcp_lease_renewal=DEFAULT_LEASE_RENEWAL, |
190 |
dhcp_server_ip=DHCP_DUMMY_SERVER_IP, dhcp_nameservers = [], |
191 |
ra_period=DEFAULT_RA_PERIOD, ipv6_nameservers = []): |
192 |
|
193 |
self.data_path = data_path |
194 |
self.lease_lifetime = dhcp_lease_lifetime |
195 |
self.lease_renewal = dhcp_lease_renewal |
196 |
self.dhcp_server_ip = dhcp_server_ip |
197 |
self.ra_period = ra_period |
198 |
self.dhcp_nameservers = dhcp_nameservers |
199 |
self.ipv6_nameservers = ipv6_nameservers |
200 |
|
201 |
self.clients = {} |
202 |
self.subnets = {} |
203 |
self.ifaces = {} |
204 |
self.v6nets = {} |
205 |
self.nfq = {} |
206 |
|
207 |
# Inotify setup |
208 |
self.wm = pyinotify.WatchManager() |
209 |
mask = pyinotify.EventsCodes.ALL_FLAGS["IN_DELETE"] |
210 |
mask |= pyinotify.EventsCodes.ALL_FLAGS["IN_CLOSE_WRITE"] |
211 |
handler = ClientFileHandler(self) |
212 |
self.notifier = pyinotify.Notifier(self.wm, handler) |
213 |
self.wm.add_watch(self.data_path, mask, rec=True) |
214 |
|
215 |
# NFQUEUE setup |
216 |
if dhcp_queue_num is not None: |
217 |
self._setup_nfqueue(dhcp_queue_num, AF_INET, self.dhcp_response) |
218 |
|
219 |
if rs_queue_num is not None: |
220 |
self._setup_nfqueue(rs_queue_num, AF_INET6, self.rs_response) |
221 |
|
222 |
if ns_queue_num is not None: |
223 |
self._setup_nfqueue(ns_queue_num, AF_INET6, self.ns_response) |
224 |
|
225 |
def _setup_nfqueue(self, queue_num, family, callback): |
226 |
logging.debug("Setting up NFQUEUE for queue %d, AF %s" % |
227 |
(queue_num, family)) |
228 |
q = nfqueue.queue() |
229 |
q.set_callback(callback) |
230 |
q.fast_open(queue_num, family) |
231 |
q.set_queue_maxlen(5000) |
232 |
# This is mandatory for the queue to operate |
233 |
q.set_mode(nfqueue.NFQNL_COPY_PACKET) |
234 |
self.nfq[q.get_fd()] = q |
235 |
|
236 |
def build_config(self): |
237 |
self.clients.clear() |
238 |
self.subnets.clear() |
239 |
|
240 |
for file in glob.glob(os.path.join(self.data_path, "*")): |
241 |
self.add_iface(file) |
242 |
|
243 |
def get_ifindex(self, iface): |
244 |
""" Get the interface index from sysfs |
245 |
|
246 |
""" |
247 |
file = os.path.abspath(os.path.join(SYSFS_NET, iface, "ifindex")) |
248 |
if not file.startswith(SYSFS_NET): |
249 |
return None |
250 |
|
251 |
ifindex = None |
252 |
|
253 |
try: |
254 |
f = open(file, 'r') |
255 |
ifindex = int(f.readline().strip()) |
256 |
f.close() |
257 |
except IOError: |
258 |
logging.debug("%s is down, removing" % iface) |
259 |
self.remove_iface(iface) |
260 |
|
261 |
return ifindex |
262 |
|
263 |
|
264 |
def get_iface_hw_addr(self, iface): |
265 |
""" Get the interface hardware address from sysfs |
266 |
|
267 |
""" |
268 |
file = os.path.abspath(os.path.join(SYSFS_NET, iface, "address")) |
269 |
if not file.startswith(SYSFS_NET): |
270 |
return None |
271 |
|
272 |
addr = None |
273 |
try: |
274 |
f = open(file, 'r') |
275 |
addr = f.readline().strip() |
276 |
f.close() |
277 |
except IOError: |
278 |
logging.debug("%s is down, removing" % iface) |
279 |
self.remove_iface(iface) |
280 |
|
281 |
return addr |
282 |
|
283 |
def parse_routing_table(self, table="main", family=4): |
284 |
""" Parse the given routing table to get connected route, gateway and |
285 |
default device. |
286 |
|
287 |
""" |
288 |
ipro = subprocess.Popen(["ip", "-%d" % family, "ro", "ls", |
289 |
"table", table], stdout=subprocess.PIPE) |
290 |
routes = ipro.stdout.readlines() |
291 |
|
292 |
def_gw = None |
293 |
def_dev = None |
294 |
def_net = None |
295 |
|
296 |
for route in routes: |
297 |
match = re.match(r'^default.*via ([^\s]+).*dev ([^\s]+)', route) |
298 |
if match: |
299 |
def_gw, def_dev = match.groups() |
300 |
break |
301 |
|
302 |
for route in routes: |
303 |
# Find the least-specific connected route |
304 |
try: |
305 |
def_net = re.match("^([^\\s]+) dev %s" % |
306 |
def_dev, route).groups()[0] |
307 |
def_net = IPy.IP(def_net) |
308 |
except: |
309 |
pass |
310 |
|
311 |
return Subnet(net=def_net, gw=def_gw, dev=def_dev) |
312 |
|
313 |
def parse_binding_file(self, path): |
314 |
""" Read a client configuration from a tap file |
315 |
|
316 |
""" |
317 |
try: |
318 |
iffile = open(path, 'r') |
319 |
except: |
320 |
return (None, None, None, None) |
321 |
mac = None |
322 |
ips = None |
323 |
link = None |
324 |
hostname = None |
325 |
|
326 |
for line in iffile: |
327 |
if line.startswith("IP="): |
328 |
ip = line.strip().split("=")[1] |
329 |
ips = ip.split() |
330 |
elif line.startswith("MAC="): |
331 |
mac = line.strip().split("=")[1] |
332 |
elif line.startswith("LINK="): |
333 |
link = line.strip().split("=")[1] |
334 |
elif line.startswith("HOSTNAME="): |
335 |
hostname = line.strip().split("=")[1] |
336 |
|
337 |
return Client(mac=mac, ips=ips, link=link, hostname=hostname) |
338 |
|
339 |
def add_iface(self, path): |
340 |
""" Add an interface to monitor |
341 |
|
342 |
""" |
343 |
iface = os.path.basename(path) |
344 |
|
345 |
logging.debug("Updating configuration for %s" % iface) |
346 |
binding = self.parse_binding_file(path) |
347 |
ifindex = self.get_ifindex(iface) |
348 |
|
349 |
if ifindex is None: |
350 |
logging.warn("Stale configuration for %s found" % iface) |
351 |
else: |
352 |
if binding.is_valid(): |
353 |
binding.iface = iface |
354 |
self.clients[binding.mac] = binding |
355 |
self.subnets[binding.link] = self.parse_routing_table( |
356 |
binding.link) |
357 |
logging.debug("Added client %s on %s" % |
358 |
(binding.hostname, iface)) |
359 |
self.ifaces[ifindex] = iface |
360 |
self.v6nets[iface] = self.parse_routing_table(binding.link, 6) |
361 |
|
362 |
def remove_iface(self, iface): |
363 |
""" Cleanup clients on a removed interface |
364 |
|
365 |
""" |
366 |
if iface in self.v6nets: |
367 |
del self.v6nets[iface] |
368 |
|
369 |
for mac in self.clients.keys(): |
370 |
if self.clients[mac].iface == iface: |
371 |
del self.clients[mac] |
372 |
|
373 |
for ifindex in self.ifaces.keys(): |
374 |
if self.ifaces[ifindex] == iface: |
375 |
del self.ifaces[ifindex] |
376 |
|
377 |
logging.debug("Removed interface %s" % iface) |
378 |
|
379 |
def dhcp_response(self, i, payload): |
380 |
""" Generate a reply to a BOOTP/DHCP request |
381 |
|
382 |
""" |
383 |
# Decode the response - NFQUEUE relays IP packets |
384 |
pkt = IP(payload.get_data()) |
385 |
|
386 |
# Get the actual interface from the ifindex |
387 |
iface = self.ifaces[payload.get_indev()] |
388 |
|
389 |
# Signal the kernel that it shouldn't further process the packet |
390 |
payload.set_verdict(nfqueue.NF_DROP) |
391 |
|
392 |
# Get the client MAC address |
393 |
resp = pkt.getlayer(BOOTP).copy() |
394 |
hlen = resp.hlen |
395 |
mac = resp.chaddr[:hlen].encode("hex") |
396 |
mac, _ = re.subn(r'([0-9a-fA-F]{2})', r'\1:', mac, hlen-1) |
397 |
|
398 |
# Server responses are always BOOTREPLYs |
399 |
resp.op = "BOOTREPLY" |
400 |
del resp.payload |
401 |
|
402 |
try: |
403 |
binding = self.clients[mac] |
404 |
except KeyError: |
405 |
logging.warn("Invalid client %s on %s" % (mac, iface)) |
406 |
return |
407 |
|
408 |
if iface != binding.iface: |
409 |
logging.warn("Received spoofed DHCP request for %s from interface" |
410 |
" %s instead of %s" % |
411 |
(mac, iface, binding.iface)) |
412 |
return |
413 |
|
414 |
resp = Ether(dst=mac, src=self.get_iface_hw_addr(iface))/\ |
415 |
IP(src=DHCP_DUMMY_SERVER_IP, dst=binding.ip)/\ |
416 |
UDP(sport=pkt.dport, dport=pkt.sport)/resp |
417 |
subnet = self.subnets[binding.link] |
418 |
|
419 |
if not DHCP in pkt: |
420 |
logging.warn("Invalid request from %s on %s, no DHCP" |
421 |
" payload found" % (binding.mac, iface)) |
422 |
return |
423 |
|
424 |
dhcp_options = [] |
425 |
requested_addr = binding.ip |
426 |
for opt in pkt[DHCP].options: |
427 |
if type(opt) is tuple and opt[0] == "message-type": |
428 |
req_type = opt[1] |
429 |
if type(opt) is tuple and opt[0] == "requested_addr": |
430 |
requested_addr = opt[1] |
431 |
|
432 |
logging.info("%s from %s on %s" % |
433 |
(DHCP_TYPES.get(req_type, "UNKNOWN"), binding.mac, iface)) |
434 |
|
435 |
if req_type == DHCPREQUEST and requested_addr != binding.ip: |
436 |
resp_type = DHCPNAK |
437 |
logging.info("Sending DHCPNAK to %s on %s: requested %s" |
438 |
" instead of %s" % |
439 |
(binding.mac, iface, requested_addr, binding.ip)) |
440 |
|
441 |
elif req_type in (DHCPDISCOVER, DHCPREQUEST): |
442 |
resp_type = DHCP_REQRESP[req_type] |
443 |
resp.yiaddr = self.clients[mac].ip |
444 |
dhcp_options += [ |
445 |
("hostname", binding.hostname), |
446 |
("domain", binding.hostname.split('.', 1)[-1]), |
447 |
("router", subnet.gw), |
448 |
("name_server", "194.177.210.10"), |
449 |
("name_server", "194.177.210.211"), |
450 |
("broadcast_address", str(subnet.broadcast)), |
451 |
("subnet_mask", str(subnet.netmask)), |
452 |
("renewal_time", self.lease_renewal), |
453 |
("lease_time", self.lease_lifetime), |
454 |
] |
455 |
|
456 |
elif req_type == DHCPINFORM: |
457 |
resp_type = DHCP_REQRESP[req_type] |
458 |
dhcp_options += [ |
459 |
("hostname", binding.hostname), |
460 |
("domain", binding.hostname.split('.', 1)[-1]), |
461 |
("name_server", "194.177.210.10"), |
462 |
("name_server", "194.177.210.211"), |
463 |
] |
464 |
|
465 |
elif req_type == DHCPRELEASE: |
466 |
# Log and ignore |
467 |
logging.info("DHCPRELEASE from %s on %s" % |
468 |
(binding.mac, iface)) |
469 |
return |
470 |
|
471 |
# Finally, always add the server identifier and end options |
472 |
dhcp_options += [ |
473 |
("message-type", resp_type), |
474 |
("server_id", DHCP_DUMMY_SERVER_IP), |
475 |
"end" |
476 |
] |
477 |
resp /= DHCP(options=dhcp_options) |
478 |
|
479 |
logging.info("%s to %s (%s) on %s" % |
480 |
(DHCP_TYPES[resp_type], mac, binding.ip, iface)) |
481 |
sendp(resp, iface=iface, verbose=False) |
482 |
|
483 |
def rs_response(self, i, payload): |
484 |
""" Generate a reply to a BOOTP/DHCP request |
485 |
|
486 |
""" |
487 |
# Get the actual interface from the ifindex |
488 |
iface = self.ifaces[payload.get_indev()] |
489 |
ifmac = self.get_iface_hw_addr(iface) |
490 |
subnet = self.v6nets[iface] |
491 |
ifll = subnet.make_ll64(ifmac) |
492 |
|
493 |
# Signal the kernel that it shouldn't further process the packet |
494 |
payload.set_verdict(nfqueue.NF_DROP) |
495 |
|
496 |
resp = Ether(src=self.get_iface_hw_addr(iface))/\ |
497 |
IPv6(src=str(ifll))/ICMPv6ND_RA(routerlifetime=14400)/\ |
498 |
ICMPv6NDOptPrefixInfo(prefix=str(subnet.prefix), |
499 |
prefixlen=subnet.prefixlen) |
500 |
|
501 |
logging.info("RA on %s for %s" % (iface, subnet.net)) |
502 |
sendp(resp, iface=iface, verbose=False) |
503 |
|
504 |
def ns_response(self, i, payload): |
505 |
""" Generate a reply to an ICMPv6 neighbor solicitation |
506 |
|
507 |
""" |
508 |
# Get the actual interface from the ifindex |
509 |
iface = self.ifaces[payload.get_indev()] |
510 |
ifmac = self.get_iface_hw_addr(iface) |
511 |
subnet = self.v6nets[iface] |
512 |
ifll = subnet.make_ll64(ifmac) |
513 |
|
514 |
ns = IPv6(payload.get_data()) |
515 |
|
516 |
if not (subnet.net.overlaps(ns.tgt) or str(ns.tgt) == str(ifll)): |
517 |
logging.debug("Received NS for a non-routable IP (%s)" % ns.tgt) |
518 |
payload.set_verdict(nfqueue.NF_ACCEPT) |
519 |
return 1 |
520 |
|
521 |
payload.set_verdict(nfqueue.NF_DROP) |
522 |
|
523 |
try: |
524 |
client_lladdr = ns.lladdr |
525 |
except AttributeError: |
526 |
return 1 |
527 |
|
528 |
resp = Ether(src=ifmac, dst=client_lladdr)/\ |
529 |
IPv6(src=str(ifll), dst=ns.src)/\ |
530 |
ICMPv6ND_NA(R=1, O=0, S=1, tgt=ns.tgt)/\ |
531 |
ICMPv6NDOptDstLLAddr(lladdr=ifmac) |
532 |
|
533 |
logging.info("NA on %s for %s" % (iface, ns.tgt)) |
534 |
sendp(resp, iface=iface, verbose=False) |
535 |
return 1 |
536 |
|
537 |
def send_periodic_ra(self): |
538 |
# Use a separate thread as this may take a _long_ time with |
539 |
# many interfaces and we want to be responsive in the mean time |
540 |
threading.Thread(target=self._send_periodic_ra).start() |
541 |
|
542 |
def _send_periodic_ra(self): |
543 |
logging.debug("Sending out periodic RAs") |
544 |
start = time.time() |
545 |
i = 0 |
546 |
for client in self.clients.values(): |
547 |
iface = client.iface |
548 |
ifmac = self.get_iface_hw_addr(iface) |
549 |
if not ifmac: |
550 |
continue |
551 |
|
552 |
subnet = self.v6nets[iface] |
553 |
ifll = subnet.make_ll64(ifmac) |
554 |
resp = Ether(src=ifmac)/\ |
555 |
IPv6(src=str(ifll))/ICMPv6ND_RA(routerlifetime=14400)/\ |
556 |
ICMPv6NDOptPrefixInfo(prefix=str(subnet.prefix), |
557 |
prefixlen=subnet.prefixlen) |
558 |
try: |
559 |
sendp(resp, iface=iface, verbose=False) |
560 |
except: |
561 |
logging.debug("Periodic RA on %s failed" % iface) |
562 |
i += 1 |
563 |
logging.debug("Sent %d RAs in %.2f seconds" % (i, time.time() - start)) |
564 |
|
565 |
def serve(self): |
566 |
""" Loop forever, serving DHCP requests |
567 |
|
568 |
""" |
569 |
self.build_config() |
570 |
|
571 |
iwfd = self.notifier._fd |
572 |
|
573 |
start = time.time() |
574 |
timeout = self.ra_period |
575 |
self.send_periodic_ra() |
576 |
|
577 |
while True: |
578 |
rlist, _, xlist = select(self.nfq.keys() + [iwfd], [], [], timeout) |
579 |
if xlist: |
580 |
logging.warn("Warning: Exception on %s" % |
581 |
", ".join([ str(fd) for fd in xlist])) |
582 |
|
583 |
if rlist: |
584 |
if iwfd in rlist: |
585 |
# First check if there are any inotify (= configuration change) |
586 |
# events |
587 |
self.notifier.read_events() |
588 |
self.notifier.process_events() |
589 |
rlist.remove(iwfd) |
590 |
|
591 |
for fd in rlist: |
592 |
try: |
593 |
self.nfq[fd].process_pending() |
594 |
except e, msg: |
595 |
logging.warn("Error processing fd %d: %s" % (fd, e)) |
596 |
|
597 |
# Calculate the new timeout |
598 |
timeout = self.ra_period - (time.time() - start) |
599 |
|
600 |
if timeout <= 0: |
601 |
start = time.time() |
602 |
self.send_periodic_ra() |
603 |
timeout = self.ra_period - (time.time() - start) |
604 |
|
605 |
|
606 |
|
607 |
if __name__ == "__main__": |
608 |
import optparse |
609 |
from cStringIO import StringIO |
610 |
from capng import * |
611 |
from pwd import getpwnam, getpwuid |
612 |
from configobj import ConfigObj, flatten_errors |
613 |
|
614 |
import validate |
615 |
|
616 |
validator = validate.Validator() |
617 |
|
618 |
def is_ip_list(value, family=4): |
619 |
try: |
620 |
family = int(family) |
621 |
except ValueError: |
622 |
raise vaildate.VdtParamError(family) |
623 |
if isinstance(value, (str, unicode)): |
624 |
value = [value] |
625 |
if not isinstance(value, list): |
626 |
raise validate.VdtTypeError(value) |
627 |
|
628 |
for entry in value: |
629 |
try: |
630 |
ip = IPy.IP(entry) |
631 |
except ValueError: |
632 |
raise validate.VdtValueError(entry) |
633 |
|
634 |
if ip.version() != family: |
635 |
raise validate.VdtValueError(entry) |
636 |
return value |
637 |
|
638 |
validator.functions["ip_addr_list"] = is_ip_list |
639 |
config_spec = StringIO(CONFIG_SPEC) |
640 |
|
641 |
|
642 |
parser = optparse.OptionParser() |
643 |
parser.add_option("-c", "--config", dest="config_file", |
644 |
help="The location of the data files", metavar="FILE", |
645 |
default=DEFAULT_CONFIG) |
646 |
parser.add_option("-d", "--debug", action="store_true", dest="debug", |
647 |
help="Turn on debugging messages") |
648 |
parser.add_option("-f", "--foreground", action="store_false", dest="daemonize", |
649 |
default=True, help="Do not daemonize, stay in the foreground") |
650 |
|
651 |
|
652 |
opts, args = parser.parse_args() |
653 |
|
654 |
if opts.daemonize: |
655 |
d = daemon.DaemonContext() |
656 |
d.open() |
657 |
|
658 |
try: |
659 |
config = ConfigObj(opts.config_file, configspec=config_spec) |
660 |
except: |
661 |
sys.stderr.write("Failed to parse config file %s" % opts.config_file) |
662 |
sys.exit(1) |
663 |
|
664 |
results = config.validate(validator) |
665 |
if results != True: |
666 |
logging.fatal("Configuration file validation failed! See errors below:") |
667 |
for (section_list, key, _) in flatten_errors(config, results): |
668 |
if key is not None: |
669 |
logging.fatal(" '%s' in section '%s' failed validation" % (key, ", ".join(section_list))) |
670 |
else: |
671 |
logging.fatal(" Section '%s' is missing" % ", ".join(section_list)) |
672 |
sys.exit(1) |
673 |
|
674 |
pidfile = open(config["general"]["pidfile"], "w") |
675 |
pidfile.write("%s" % os.getpid()) |
676 |
pidfile.close() |
677 |
|
678 |
logger = logging.getLogger() |
679 |
if opts.debug: |
680 |
logger.setLevel(logging.DEBUG) |
681 |
else: |
682 |
logger.setLevel(logging.INFO) |
683 |
|
684 |
if opts.daemonize: |
685 |
logfile = os.path.join(config["general"]["logdir"], LOG_FILENAME) |
686 |
handler = logging.handlers.RotatingFileHandler(logfile, |
687 |
maxBytes=2097152) |
688 |
else: |
689 |
handler = logging.StreamHandler() |
690 |
|
691 |
handler.setFormatter(logging.Formatter(LOG_FORMAT)) |
692 |
logger.addHandler(handler) |
693 |
|
694 |
logging.info("Starting up") |
695 |
|
696 |
proxy_opts = {} |
697 |
if config["dhcp"].as_bool("enable_dhcp"): |
698 |
proxy_opts.update({ |
699 |
"dhcp_queue_num": config["dhcp"].as_int("dhcp_queue"), |
700 |
"dhcp_lease_lifetime": config["dhcp"].as_int("lease_lifetime"), |
701 |
"dhcp_lease_renewal": config["dhcp"].as_int("lease_renewal"), |
702 |
"dhcp_server_ip": config["dhcp"]["server_ip"], |
703 |
"dhcp_nameservers": config["dhcp"]["nameservers"], |
704 |
}) |
705 |
|
706 |
if config["ipv6"].as_bool("enable_ipv6"): |
707 |
proxy_opts.update({ |
708 |
"rs_queue_num": config["ipv6"].as_int("rs_queue"), |
709 |
"ns_queue_num": config["ipv6"].as_int("ns_queue"), |
710 |
"ra_period": config["ipv6"].as_int("ra_period"), |
711 |
"ipv6_nameservers": config["ipv6"]["nameservers"], |
712 |
}) |
713 |
|
714 |
proxy = VMNetProxy(data_path=config["general"]["datapath"], **proxy_opts) |
715 |
|
716 |
# Drop all capabilities except CAP_NET_RAW and change uid |
717 |
try: |
718 |
uid = getpwuid(config["general"].as_int("user")) |
719 |
except ValueError: |
720 |
uid = getpwnam(config["general"]["user"]) |
721 |
|
722 |
logging.info("Setting capabilities and changing uid") |
723 |
logging.debug("User: %s, uid: %d, gid: %d" % |
724 |
(config["general"]["user"], uid.pw_uid, uid.pw_gid)) |
725 |
capng_clear(CAPNG_SELECT_BOTH) |
726 |
capng_update(CAPNG_ADD, CAPNG_EFFECTIVE|CAPNG_PERMITTED, CAP_NET_RAW) |
727 |
capng_change_id(uid.pw_uid, uid.pw_gid, |
728 |
CAPNG_DROP_SUPP_GRP | CAPNG_CLEAR_BOUNDING) |
729 |
logging.info("Ready to serve requests") |
730 |
proxy.serve() |
731 |
|
732 |
|
733 |
# vim: set ts=4 sts=4 sw=4 et : |