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#!/usr/bin/env python |
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# |
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|
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# nfdcpd: A promiscuous, NFQUEUE-based DHCP server for virtual machine hosting |
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# Copyright (c) 2010 GRNET SA |
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# |
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# This program is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License along |
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# with this program; if not, write to the Free Software Foundation, Inc., |
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
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# |
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|
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import os |
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import re |
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import glob |
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import time |
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import logging |
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import logging.handlers |
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import threading |
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import subprocess |
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|
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import daemon |
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import nfqueue |
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import pyinotify |
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|
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import IPy |
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import socket |
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from select import select |
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from socket import AF_INET, AF_INET6 |
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|
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from scapy.layers.l2 import Ether |
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from scapy.layers.inet import IP, UDP |
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from scapy.layers.inet6 import * |
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from scapy.layers.dhcp import BOOTP, DHCP |
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from scapy.sendrecv import sendp |
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|
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DEFAULT_CONFIG = "/etc/nfdhcpd/nfdhcpd.conf" |
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DEFAULT_PATH = "/var/run/ganeti-dhcpd" |
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DEFAULT_USER = "nobody" |
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DEFAULT_LEASE_LIFETIME = 604800 # 1 week |
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DEFAULT_LEASE_RENEWAL = 600 # 10 min |
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DEFAULT_RA_PERIOD = 300 # seconds |
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DHCP_DUMMY_SERVER_IP = "1.2.3.4" |
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|
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LOG_FILENAME = "nfdhcpd.log" |
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|
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SYSFS_NET = "/sys/class/net" |
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|
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LOG_FORMAT = "%(asctime)-15s %(levelname)-6s %(message)s" |
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|
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# Configuration file specification (see configobj documentation) |
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CONFIG_SPEC = """ |
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[general] |
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pidfile = string() |
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datapath = string() |
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logdir = string() |
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user = string() |
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|
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[dhcp] |
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enable_dhcp = boolean(default=True) |
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lease_lifetime = integer(min=0, max=4294967295) |
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lease_renewal = integer(min=0, max=4294967295) |
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server_ip = ip_addr() |
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dhcp_queue = integer(min=0, max=65535) |
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nameservers = ip_addr_list(family=4) |
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|
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[ipv6] |
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enable_ipv6 = boolean(default=True) |
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ra_period = integer(min=1, max=4294967295) |
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rs_queue = integer(min=0, max=65535) |
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ns_queue = integer(min=0, max=65535) |
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nameservers = ip_addr_list(family=6) |
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""" |
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|
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|
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DHCPDISCOVER = 1 |
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DHCPOFFER = 2 |
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DHCPREQUEST = 3 |
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DHCPDECLINE = 4 |
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DHCPACK = 5 |
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DHCPNAK = 6 |
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DHCPRELEASE = 7 |
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DHCPINFORM = 8 |
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|
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DHCP_TYPES = { |
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DHCPDISCOVER: "DHCPDISCOVER", |
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DHCPOFFER: "DHCPOFFER", |
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DHCPREQUEST: "DHCPREQUEST", |
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DHCPDECLINE: "DHCPDECLINE", |
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DHCPACK: "DHCPACK", |
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DHCPNAK: "DHCPNAK", |
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DHCPRELEASE: "DHCPRELEASE", |
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DHCPINFORM: "DHCPINFORM", |
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} |
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|
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DHCP_REQRESP = { |
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DHCPDISCOVER: DHCPOFFER, |
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DHCPREQUEST: DHCPACK, |
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DHCPINFORM: DHCPACK, |
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} |
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|
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|
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class ClientFileHandler(pyinotify.ProcessEvent): |
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def __init__(self, server): |
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pyinotify.ProcessEvent.__init__(self) |
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self.server = server |
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|
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def process_IN_DELETE(self, event): |
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self.server.remove_iface(event.name) |
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|
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def process_IN_CLOSE_WRITE(self, event): |
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self.server.add_iface(os.path.join(event.path, event.name)) |
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|
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|
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class Client(object): |
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def __init__(self, mac=None, ips=None, link=None, hostname=None): |
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self.mac = mac |
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self.ips = ips |
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self.hostname = hostname |
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self.link = link |
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self.iface = None |
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|
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@property |
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def ip(self): |
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return self.ips[0] |
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|
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def is_valid(self): |
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return self.mac is not None and self.ips is not None\ |
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and self.hostname is not None |
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|
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|
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class Subnet(object): |
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def __init__(self, net=None, gw=None, dev=None): |
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if isinstance(net, str): |
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self.net = IPy.IP(net) |
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else: |
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self.net = net |
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self.gw = gw |
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self.dev = dev |
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|
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@property |
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def netmask(self): |
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return str(self.net.netmask()) |
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|
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@property |
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def broadcast(self): |
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return str(self.net.broadcast()) |
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|
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@property |
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def prefix(self): |
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return self.net.net() |
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|
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@property |
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def prefixlen(self): |
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return self.net.prefixlen() |
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|
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@staticmethod |
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def _make_eui64(net, mac): |
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""" Compute an EUI-64 address from an EUI-48 (MAC) address |
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|
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""" |
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comp = mac.split(":") |
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prefix = IPy.IP(net).net().strFullsize().split(":")[:4] |
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eui64 = comp[:3] + ["ff", "fe"] + comp[3:] |
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eui64[0] = "%02x" % (int(eui64[0], 16) ^ 0x02) |
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for l in range(0, len(eui64), 2): |
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prefix += ["".join(eui64[l:l+2])] |
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return IPy.IP(":".join(prefix)) |
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|
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def make_eui64(self, mac): |
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return self._make_eui64(self.net, mac) |
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|
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def make_ll64(self, mac): |
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return self._make_eui64("fe80::", mac) |
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|
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|
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class VMNetProxy(object): |
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def __init__(self, data_path, dhcp_queue_num=None, |
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rs_queue_num=None, ns_queue_num=None, |
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dhcp_lease_lifetime=DEFAULT_LEASE_LIFETIME, |
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dhcp_lease_renewal=DEFAULT_LEASE_RENEWAL, |
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dhcp_server_ip=DHCP_DUMMY_SERVER_IP, dhcp_nameservers = [], |
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ra_period=DEFAULT_RA_PERIOD, ipv6_nameservers = []): |
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|
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self.data_path = data_path |
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self.lease_lifetime = dhcp_lease_lifetime |
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self.lease_renewal = dhcp_lease_renewal |
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self.dhcp_server_ip = dhcp_server_ip |
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self.ra_period = ra_period |
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self.dhcp_nameservers = dhcp_nameservers |
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self.ipv6_nameservers = ipv6_nameservers |
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self.ipv6_enabled = False |
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|
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self.clients = {} |
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self.subnets = {} |
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self.ifaces = {} |
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self.v6nets = {} |
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self.nfq = {} |
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|
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# Inotify setup |
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self.wm = pyinotify.WatchManager() |
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mask = pyinotify.EventsCodes.ALL_FLAGS["IN_DELETE"] |
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mask |= pyinotify.EventsCodes.ALL_FLAGS["IN_CLOSE_WRITE"] |
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handler = ClientFileHandler(self) |
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self.notifier = pyinotify.Notifier(self.wm, handler) |
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self.wm.add_watch(self.data_path, mask, rec=True) |
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|
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# NFQUEUE setup |
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if dhcp_queue_num is not None: |
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self._setup_nfqueue(dhcp_queue_num, AF_INET, self.dhcp_response) |
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|
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if rs_queue_num is not None: |
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self._setup_nfqueue(rs_queue_num, AF_INET6, self.rs_response) |
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self.ipv6_enabled = True |
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|
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if ns_queue_num is not None: |
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self._setup_nfqueue(ns_queue_num, AF_INET6, self.ns_response) |
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self.ipv6_enabled = True |
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|
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def _setup_nfqueue(self, queue_num, family, callback): |
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logging.debug("Setting up NFQUEUE for queue %d, AF %s" % |
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(queue_num, family)) |
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q = nfqueue.queue() |
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q.set_callback(callback) |
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q.fast_open(queue_num, family) |
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q.set_queue_maxlen(5000) |
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# This is mandatory for the queue to operate |
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q.set_mode(nfqueue.NFQNL_COPY_PACKET) |
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self.nfq[q.get_fd()] = q |
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|
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def build_config(self): |
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self.clients.clear() |
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self.subnets.clear() |
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|
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for file in glob.glob(os.path.join(self.data_path, "*")): |
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self.add_iface(file) |
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|
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def get_ifindex(self, iface): |
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""" Get the interface index from sysfs |
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|
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""" |
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file = os.path.abspath(os.path.join(SYSFS_NET, iface, "ifindex")) |
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if not file.startswith(SYSFS_NET): |
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return None |
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|
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ifindex = None |
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|
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try: |
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f = open(file, 'r') |
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except EnvironmentError: |
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logging.debug("%s is probably down, removing" % iface) |
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self.remove_iface(iface) |
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|
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return ifindex |
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|
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try: |
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ifindex = f.readline().strip() |
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try: |
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ifindex = int(ifindex) |
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except ValueError, e: |
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logging.warn("Failed to get ifindex for %s, cannot parse sysfs" |
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" output '%s'" % (iface, ifindex)) |
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except EnvironmentError, e: |
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logging.warn("Error reading %s's ifindex from sysfs: %s" % |
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(iface, str(e))) |
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self.remove_iface(iface) |
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finally: |
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f.close() |
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|
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return ifindex |
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|
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|
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def get_iface_hw_addr(self, iface): |
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""" Get the interface hardware address from sysfs |
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|
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""" |
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file = os.path.abspath(os.path.join(SYSFS_NET, iface, "address")) |
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if not file.startswith(SYSFS_NET): |
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return None |
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|
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addr = None |
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try: |
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f = open(file, 'r') |
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except EnvironmentError: |
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logging.debug("%s is probably down, removing" % iface) |
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self.remove_iface(iface) |
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return addr |
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|
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try: |
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addr = f.readline().strip() |
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except EnvironmentError, e: |
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logging.warn("Failed to read hw address for %s from sysfs: %s" % |
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(iface, str(e))) |
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finally: |
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f.close() |
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|
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return addr |
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|
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def parse_routing_table(self, table="main", family=4): |
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""" Parse the given routing table to get connected route, gateway and |
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default device. |
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|
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""" |
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ipro = subprocess.Popen(["ip", "-%d" % family, "ro", "ls", |
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"table", table], stdout=subprocess.PIPE) |
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routes = ipro.stdout.readlines() |
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|
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def_gw = None |
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def_dev = None |
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def_net = None |
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|
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for route in routes: |
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match = re.match(r'^default.*via ([^\s]+).*dev ([^\s]+)', route) |
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if match: |
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def_gw, def_dev = match.groups() |
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break |
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|
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for route in routes: |
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# Find the least-specific connected route |
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m = re.match("^([^\\s]+) dev %s" % def_dev, route) |
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if not m: |
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continue |
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def_net = m.groups(1) |
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|
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try: |
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def_net = IPy.IP(def_net) |
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except ValueError, e: |
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logging.warn("Unable to parse default route entry %s: %s" % |
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(def_net, str(e))) |
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|
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return Subnet(net=def_net, gw=def_gw, dev=def_dev) |
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|
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def parse_binding_file(self, path): |
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""" Read a client configuration from a tap file |
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|
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""" |
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try: |
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iffile = open(path, 'r') |
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except EnvironmentError, e: |
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logging.warn("Unable to open binding file %s: %s" % (path, str(e))) |
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return (None, None, None, None) |
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|
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mac = None |
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ips = None |
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link = None |
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hostname = None |
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|
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for line in iffile: |
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if line.startswith("IP="): |
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ip = line.strip().split("=")[1] |
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ips = ip.split() |
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elif line.startswith("MAC="): |
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mac = line.strip().split("=")[1] |
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elif line.startswith("LINK="): |
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link = line.strip().split("=")[1] |
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elif line.startswith("HOSTNAME="): |
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hostname = line.strip().split("=")[1] |
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|
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return Client(mac=mac, ips=ips, link=link, hostname=hostname) |
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|
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def add_iface(self, path): |
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""" Add an interface to monitor |
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|
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""" |
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iface = os.path.basename(path) |
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|
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logging.debug("Updating configuration for %s" % iface) |
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binding = self.parse_binding_file(path) |
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ifindex = self.get_ifindex(iface) |
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|
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if ifindex is None: |
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logging.warn("Stale configuration for %s found" % iface) |
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else: |
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if binding.is_valid(): |
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binding.iface = iface |
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self.clients[binding.mac] = binding |
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self.subnets[binding.link] = self.parse_routing_table( |
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binding.link) |
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logging.debug("Added client %s on %s" % |
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(binding.hostname, iface)) |
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self.ifaces[ifindex] = iface |
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self.v6nets[iface] = self.parse_routing_table(binding.link, 6) |
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|
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def remove_iface(self, iface): |
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""" Cleanup clients on a removed interface |
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|
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""" |
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if iface in self.v6nets: |
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del self.v6nets[iface] |
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|
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for mac in self.clients.keys(): |
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if self.clients[mac].iface == iface: |
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del self.clients[mac] |
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|
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for ifindex in self.ifaces.keys(): |
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if self.ifaces[ifindex] == iface: |
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del self.ifaces[ifindex] |
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|
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logging.debug("Removed interface %s" % iface) |
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|
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def dhcp_response(self, i, payload): |
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""" Generate a reply to a BOOTP/DHCP request |
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|
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""" |
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# Decode the response - NFQUEUE relays IP packets |
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pkt = IP(payload.get_data()) |
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|
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# Get the actual interface from the ifindex |
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iface = self.ifaces[payload.get_indev()] |
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|
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# Signal the kernel that it shouldn't further process the packet |
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payload.set_verdict(nfqueue.NF_DROP) |
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|
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# Get the client MAC address |
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resp = pkt.getlayer(BOOTP).copy() |
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hlen = resp.hlen |
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mac = resp.chaddr[:hlen].encode("hex") |
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mac, _ = re.subn(r'([0-9a-fA-F]{2})', r'\1:', mac, hlen-1) |
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|
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# Server responses are always BOOTREPLYs |
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resp.op = "BOOTREPLY" |
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del resp.payload |
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|
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try: |
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binding = self.clients[mac] |
435 |
except KeyError: |
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logging.warn("Invalid client %s on %s" % (mac, iface)) |
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return |
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|
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if iface != binding.iface: |
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logging.warn("Received spoofed DHCP request for %s from interface" |
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" %s instead of %s" % |
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(mac, iface, binding.iface)) |
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return |
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|
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resp = Ether(dst=mac, src=self.get_iface_hw_addr(iface))/\ |
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IP(src=DHCP_DUMMY_SERVER_IP, dst=binding.ip)/\ |
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UDP(sport=pkt.dport, dport=pkt.sport)/resp |
448 |
subnet = self.subnets[binding.link] |
449 |
|
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if not DHCP in pkt: |
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logging.warn("Invalid request from %s on %s, no DHCP" |
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" payload found" % (binding.mac, iface)) |
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return |
454 |
|
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dhcp_options = [] |
456 |
requested_addr = binding.ip |
457 |
for opt in pkt[DHCP].options: |
458 |
if type(opt) is tuple and opt[0] == "message-type": |
459 |
req_type = opt[1] |
460 |
if type(opt) is tuple and opt[0] == "requested_addr": |
461 |
requested_addr = opt[1] |
462 |
|
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logging.info("%s from %s on %s" % |
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(DHCP_TYPES.get(req_type, "UNKNOWN"), binding.mac, iface)) |
465 |
|
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if req_type == DHCPREQUEST and requested_addr != binding.ip: |
467 |
resp_type = DHCPNAK |
468 |
logging.info("Sending DHCPNAK to %s on %s: requested %s" |
469 |
" instead of %s" % |
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(binding.mac, iface, requested_addr, binding.ip)) |
471 |
|
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elif req_type in (DHCPDISCOVER, DHCPREQUEST): |
473 |
resp_type = DHCP_REQRESP[req_type] |
474 |
resp.yiaddr = self.clients[mac].ip |
475 |
dhcp_options += [ |
476 |
("hostname", binding.hostname), |
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("domain", binding.hostname.split('.', 1)[-1]), |
478 |
("router", subnet.gw), |
479 |
("broadcast_address", str(subnet.broadcast)), |
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("subnet_mask", str(subnet.netmask)), |
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("renewal_time", self.lease_renewal), |
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("lease_time", self.lease_lifetime), |
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] |
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dhcp_options += [("name_server", x) for x in self.dhcp_nameservers] |
485 |
|
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elif req_type == DHCPINFORM: |
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resp_type = DHCP_REQRESP[req_type] |
488 |
dhcp_options += [ |
489 |
("hostname", binding.hostname), |
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("domain", binding.hostname.split('.', 1)[-1]), |
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] |
492 |
dhcp_options += [("name_server", x) for x in self.dhcp_nameservers] |
493 |
|
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elif req_type == DHCPRELEASE: |
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# Log and ignore |
496 |
logging.info("DHCPRELEASE from %s on %s" % |
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(binding.mac, iface)) |
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return |
499 |
|
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# Finally, always add the server identifier and end options |
501 |
dhcp_options += [ |
502 |
("message-type", resp_type), |
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("server_id", DHCP_DUMMY_SERVER_IP), |
504 |
"end" |
505 |
] |
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resp /= DHCP(options=dhcp_options) |
507 |
|
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logging.info("%s to %s (%s) on %s" % |
509 |
(DHCP_TYPES[resp_type], mac, binding.ip, iface)) |
510 |
sendp(resp, iface=iface, verbose=False) |
511 |
|
512 |
def rs_response(self, i, payload): |
513 |
""" Generate a reply to a BOOTP/DHCP request |
514 |
|
515 |
""" |
516 |
# Get the actual interface from the ifindex |
517 |
iface = self.ifaces[payload.get_indev()] |
518 |
ifmac = self.get_iface_hw_addr(iface) |
519 |
subnet = self.v6nets[iface] |
520 |
ifll = subnet.make_ll64(ifmac) |
521 |
|
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# Signal the kernel that it shouldn't further process the packet |
523 |
payload.set_verdict(nfqueue.NF_DROP) |
524 |
|
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resp = Ether(src=self.get_iface_hw_addr(iface))/\ |
526 |
IPv6(src=str(ifll))/ICMPv6ND_RA(routerlifetime=14400)/\ |
527 |
ICMPv6NDOptPrefixInfo(prefix=str(subnet.prefix), |
528 |
prefixlen=subnet.prefixlen) |
529 |
|
530 |
if self.ipv6_nameservers: |
531 |
resp /= ICMPv6NDOptRDNSS(dns=self.ipv6_nameservers, |
532 |
lifetime=self.ra_period * 3) |
533 |
|
534 |
logging.info("RA on %s for %s" % (iface, subnet.net)) |
535 |
sendp(resp, iface=iface, verbose=False) |
536 |
|
537 |
def ns_response(self, i, payload): |
538 |
""" Generate a reply to an ICMPv6 neighbor solicitation |
539 |
|
540 |
""" |
541 |
# Get the actual interface from the ifindex |
542 |
iface = self.ifaces[payload.get_indev()] |
543 |
ifmac = self.get_iface_hw_addr(iface) |
544 |
subnet = self.v6nets[iface] |
545 |
ifll = subnet.make_ll64(ifmac) |
546 |
|
547 |
ns = IPv6(payload.get_data()) |
548 |
|
549 |
if not (subnet.net.overlaps(ns.tgt) or str(ns.tgt) == str(ifll)): |
550 |
logging.debug("Received NS for a non-routable IP (%s)" % ns.tgt) |
551 |
payload.set_verdict(nfqueue.NF_ACCEPT) |
552 |
return 1 |
553 |
|
554 |
payload.set_verdict(nfqueue.NF_DROP) |
555 |
|
556 |
try: |
557 |
client_lladdr = ns.lladdr |
558 |
except AttributeError: |
559 |
return 1 |
560 |
|
561 |
resp = Ether(src=ifmac, dst=client_lladdr)/\ |
562 |
IPv6(src=str(ifll), dst=ns.src)/\ |
563 |
ICMPv6ND_NA(R=1, O=0, S=1, tgt=ns.tgt)/\ |
564 |
ICMPv6NDOptDstLLAddr(lladdr=ifmac) |
565 |
|
566 |
logging.info("NA on %s for %s" % (iface, ns.tgt)) |
567 |
sendp(resp, iface=iface, verbose=False) |
568 |
return 1 |
569 |
|
570 |
def send_periodic_ra(self): |
571 |
# Use a separate thread as this may take a _long_ time with |
572 |
# many interfaces and we want to be responsive in the mean time |
573 |
threading.Thread(target=self._send_periodic_ra).start() |
574 |
|
575 |
def _send_periodic_ra(self): |
576 |
logging.debug("Sending out periodic RAs") |
577 |
start = time.time() |
578 |
i = 0 |
579 |
for client in self.clients.values(): |
580 |
iface = client.iface |
581 |
ifmac = self.get_iface_hw_addr(iface) |
582 |
if not ifmac: |
583 |
continue |
584 |
|
585 |
subnet = self.v6nets[iface] |
586 |
ifll = subnet.make_ll64(ifmac) |
587 |
resp = Ether(src=ifmac)/\ |
588 |
IPv6(src=str(ifll))/ICMPv6ND_RA(routerlifetime=14400)/\ |
589 |
ICMPv6NDOptPrefixInfo(prefix=str(subnet.prefix), |
590 |
prefixlen=subnet.prefixlen) |
591 |
if self.ipv6_nameservers: |
592 |
resp /= ICMPv6NDOptRDNSS(dns=self.ipv6_nameservers, |
593 |
lifetime=self.ra_period * 3) |
594 |
try: |
595 |
sendp(resp, iface=iface, verbose=False) |
596 |
except socket.error, e: |
597 |
logging.warn("Periodic RA on %s failed: %s" % (iface, str(e))) |
598 |
except Exception, e: |
599 |
logging.warn("Unkown error during periodic RA on %s: %s" % |
600 |
(iface, str(e))) |
601 |
i += 1 |
602 |
logging.debug("Sent %d RAs in %.2f seconds" % (i, time.time() - start)) |
603 |
|
604 |
def serve(self): |
605 |
""" Loop forever, serving DHCP requests |
606 |
|
607 |
""" |
608 |
self.build_config() |
609 |
|
610 |
iwfd = self.notifier._fd |
611 |
|
612 |
start = time.time() |
613 |
if self.ipv6_enabled: |
614 |
timeout = self.ra_period |
615 |
self.send_periodic_ra() |
616 |
else: |
617 |
timeout = None |
618 |
|
619 |
while True: |
620 |
rlist, _, xlist = select(self.nfq.keys() + [iwfd], [], [], timeout) |
621 |
if xlist: |
622 |
logging.warn("Warning: Exception on %s" % |
623 |
", ".join([ str(fd) for fd in xlist])) |
624 |
|
625 |
if rlist: |
626 |
if iwfd in rlist: |
627 |
# First check if there are any inotify (= configuration change) |
628 |
# events |
629 |
self.notifier.read_events() |
630 |
self.notifier.process_events() |
631 |
rlist.remove(iwfd) |
632 |
|
633 |
for fd in rlist: |
634 |
try: |
635 |
self.nfq[fd].process_pending() |
636 |
except Exception, e: |
637 |
logging.warn("Error processing fd %d: %s" % |
638 |
(fd, str(e))) |
639 |
|
640 |
if self.ipv6_enabled: |
641 |
# Calculate the new timeout |
642 |
timeout = self.ra_period - (time.time() - start) |
643 |
|
644 |
if timeout <= 0: |
645 |
start = time.time() |
646 |
self.send_periodic_ra() |
647 |
timeout = self.ra_period - (time.time() - start) |
648 |
|
649 |
|
650 |
if __name__ == "__main__": |
651 |
import optparse |
652 |
from cStringIO import StringIO |
653 |
from capng import * |
654 |
from pwd import getpwnam, getpwuid |
655 |
from configobj import ConfigObj, ConfigObjError, flatten_errors |
656 |
|
657 |
import validate |
658 |
|
659 |
validator = validate.Validator() |
660 |
|
661 |
def is_ip_list(value, family=4): |
662 |
try: |
663 |
family = int(family) |
664 |
except ValueError: |
665 |
raise validate.VdtParamError(family) |
666 |
if isinstance(value, (str, unicode)): |
667 |
value = [value] |
668 |
if not isinstance(value, list): |
669 |
raise validate.VdtTypeError(value) |
670 |
|
671 |
for entry in value: |
672 |
try: |
673 |
ip = IPy.IP(entry) |
674 |
except ValueError: |
675 |
raise validate.VdtValueError(entry) |
676 |
|
677 |
if ip.version() != family: |
678 |
raise validate.VdtValueError(entry) |
679 |
return value |
680 |
|
681 |
validator.functions["ip_addr_list"] = is_ip_list |
682 |
config_spec = StringIO(CONFIG_SPEC) |
683 |
|
684 |
|
685 |
parser = optparse.OptionParser() |
686 |
parser.add_option("-c", "--config", dest="config_file", |
687 |
help="The location of the data files", metavar="FILE", |
688 |
default=DEFAULT_CONFIG) |
689 |
parser.add_option("-d", "--debug", action="store_true", dest="debug", |
690 |
help="Turn on debugging messages") |
691 |
parser.add_option("-f", "--foreground", action="store_false", |
692 |
dest="daemonize", default=True, |
693 |
help="Do not daemonize, stay in the foreground") |
694 |
|
695 |
|
696 |
opts, args = parser.parse_args() |
697 |
|
698 |
if opts.daemonize: |
699 |
d = daemon.DaemonContext() |
700 |
d.umask = 0022 |
701 |
d.open() |
702 |
|
703 |
try: |
704 |
config = ConfigObj(opts.config_file, configspec=config_spec) |
705 |
except ConfigObjError, e: |
706 |
sys.stderr.write("Failed to parse config file %s: %s" % |
707 |
(opts.config_file, str(e))) |
708 |
sys.exit(1) |
709 |
|
710 |
results = config.validate(validator) |
711 |
if results != True: |
712 |
logging.fatal("Configuration file validation failed! See errors below:") |
713 |
for (section_list, key, _) in flatten_errors(config, results): |
714 |
if key is not None: |
715 |
logging.fatal(" '%s' in section '%s' failed validation" % |
716 |
(key, ", ".join(section_list))) |
717 |
else: |
718 |
logging.fatal(" Section '%s' is missing" % |
719 |
", ".join(section_list)) |
720 |
sys.exit(1) |
721 |
|
722 |
pidfile = open(config["general"]["pidfile"], "w") |
723 |
pidfile.write("%s" % os.getpid()) |
724 |
pidfile.close() |
725 |
|
726 |
logger = logging.getLogger() |
727 |
if opts.debug: |
728 |
logger.setLevel(logging.DEBUG) |
729 |
else: |
730 |
logger.setLevel(logging.INFO) |
731 |
|
732 |
logging.info("Starting up") |
733 |
|
734 |
proxy_opts = {} |
735 |
if config["dhcp"].as_bool("enable_dhcp"): |
736 |
proxy_opts.update({ |
737 |
"dhcp_queue_num": config["dhcp"].as_int("dhcp_queue"), |
738 |
"dhcp_lease_lifetime": config["dhcp"].as_int("lease_lifetime"), |
739 |
"dhcp_lease_renewal": config["dhcp"].as_int("lease_renewal"), |
740 |
"dhcp_server_ip": config["dhcp"]["server_ip"], |
741 |
"dhcp_nameservers": config["dhcp"]["nameservers"], |
742 |
}) |
743 |
|
744 |
if config["ipv6"].as_bool("enable_ipv6"): |
745 |
proxy_opts.update({ |
746 |
"rs_queue_num": config["ipv6"].as_int("rs_queue"), |
747 |
"ns_queue_num": config["ipv6"].as_int("ns_queue"), |
748 |
"ra_period": config["ipv6"].as_int("ra_period"), |
749 |
"ipv6_nameservers": config["ipv6"]["nameservers"], |
750 |
}) |
751 |
|
752 |
proxy = VMNetProxy(data_path=config["general"]["datapath"], **proxy_opts) |
753 |
|
754 |
# Drop all capabilities except CAP_NET_RAW and change uid |
755 |
try: |
756 |
uid = getpwuid(config["general"].as_int("user")) |
757 |
except ValueError: |
758 |
uid = getpwnam(config["general"]["user"]) |
759 |
|
760 |
logging.debug("Setting capabilities and changing uid") |
761 |
logging.debug("User: %s, uid: %d, gid: %d" % |
762 |
(config["general"]["user"], uid.pw_uid, uid.pw_gid)) |
763 |
capng_clear(CAPNG_SELECT_BOTH) |
764 |
capng_update(CAPNG_ADD, CAPNG_EFFECTIVE|CAPNG_PERMITTED, CAP_NET_RAW) |
765 |
capng_change_id(uid.pw_uid, uid.pw_gid, |
766 |
CAPNG_DROP_SUPP_GRP | CAPNG_CLEAR_BOUNDING) |
767 |
|
768 |
if opts.daemonize: |
769 |
logfile = os.path.join(config["general"]["logdir"], LOG_FILENAME) |
770 |
handler = logging.handlers.RotatingFileHandler(logfile, |
771 |
maxBytes=2097152) |
772 |
else: |
773 |
handler = logging.StreamHandler() |
774 |
|
775 |
handler.setFormatter(logging.Formatter(LOG_FORMAT)) |
776 |
logger.addHandler(handler) |
777 |
|
778 |
logging.info("Ready to serve requests") |
779 |
proxy.serve() |
780 |
|
781 |
|
782 |
# vim: set ts=4 sts=4 sw=4 et : |