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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 signal |
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import errno |
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import re |
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import sys |
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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 traceback |
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|
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import daemon |
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import daemon.runner |
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import daemon.pidlockfile |
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import nfqueue |
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import pyinotify |
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import setproctitle |
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from lockfile import LockTimeout |
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|
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import IPy |
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import socket |
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import select |
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from socket import AF_INET, AF_INET6 |
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|
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from scapy.data import ETH_P_ALL |
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from scapy.packet import BasePacket |
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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 IPv6, ICMPv6ND_RA, ICMPv6ND_NA, \ |
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ICMPv6NDOptDstLLAddr, \ |
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ICMPv6NDOptPrefixInfo, \ |
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ICMPv6NDOptRDNSS |
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from scapy.layers.dhcp import BOOTP, DHCP |
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from scapy.layers.dhcp6 import DHCP6_Reply, DHCP6OptDNSServers, \ |
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DHCP6OptServerId, DHCP6OptClientId, \ |
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DUID_LLT, DHCP6_InfoRequest |
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|
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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)-8s %(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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domain = string(default=None) |
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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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dhcp_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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def get_indev(payload): |
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try: |
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indev_ifindex = payload.get_physindev() |
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if indev_ifindex: |
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logging.debug(" - Incoming packet from bridge with ifindex %s", |
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indev_ifindex) |
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return indev_ifindex |
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except AttributeError: |
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#TODO: return error value |
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logging.debug("No get_physindev() supported") |
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return 0 |
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|
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indev_ifindex = payload.get_indev() |
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logging.debug(" - Incoming packet from tap with ifindex %s", indev_ifindex) |
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|
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return indev_ifindex |
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|
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|
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def parse_binding_file(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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logging.info("Parsing binding file %s", path) |
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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 |
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|
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tap = os.path.basename(path) |
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indev = None |
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mac = None |
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ip = None |
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hostname = None |
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subnet = None |
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gateway = None |
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subnet6 = None |
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gateway6 = None |
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eui64 = None |
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|
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def get_value(line): |
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v = line.strip().split('=')[1] |
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if v == '': |
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return None |
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return v |
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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 = get_value(line) |
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elif line.startswith("MAC="): |
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mac = get_value(line) |
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elif line.startswith("HOSTNAME="): |
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hostname = get_value(line) |
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elif line.startswith("INDEV="): |
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indev = get_value(line) |
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elif line.startswith("SUBNET="): |
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subnet = get_value(line) |
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elif line.startswith("GATEWAY="): |
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gateway = get_value(line) |
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elif line.startswith("SUBNET6="): |
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subnet6 = get_value(line) |
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elif line.startswith("GATEWAY6="): |
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gateway6 = get_value(line) |
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elif line.startswith("EUI64="): |
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eui64 = get_value(line) |
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|
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try: |
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return Client(tap=tap, mac=mac, ip=ip, hostname=hostname, |
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indev=indev, subnet=subnet, gateway=gateway, |
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subnet6=subnet6, gateway6=gateway6, eui64=eui64 ) |
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except ValueError: |
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logging.warning(" - Cannot add client for host %s and IP %s on tap %s", |
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hostname, ip, tap) |
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return None |
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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): # pylint: disable=C0103 |
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""" Delete file handler |
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|
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Currently this removes an interface from the watch list |
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|
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""" |
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self.server.remove_tap(event.name) |
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|
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def process_IN_CLOSE_WRITE(self, event): # pylint: disable=C0103 |
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""" Add file handler |
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|
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Currently this adds an interface to the watch list |
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|
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""" |
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self.server.add_tap(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, tap=None, indev=None, |
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mac=None, ip=None, hostname=None, |
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subnet=None, gateway=None, |
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subnet6=None, gateway6=None, eui64=None): |
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self.mac = mac |
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self.ip = ip |
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self.hostname = hostname |
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self.indev = indev |
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self.tap = tap |
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self.subnet = subnet |
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self.gateway = gateway |
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self.net = Subnet(net=subnet, gw=gateway, dev=tap) |
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self.subnet6 = subnet6 |
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self.gateway6 = gateway6 |
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self.net6 = Subnet(net=subnet6, gw=gateway6, dev=tap) |
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self.eui64 = eui64 |
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self.open_socket() |
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|
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def is_valid(self): |
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return self.mac is not None and self.hostname is not None |
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|
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|
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def open_socket(self): |
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|
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logging.info(" - Opening L2 socket and binding to %s", self.tap) |
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try: |
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s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, ETH_P_ALL) |
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s.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, 0) |
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s.bind((self.tap, ETH_P_ALL)) |
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self.socket = s |
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except socket.error, e: |
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logging.warning(" - Cannot open socket %s", e) |
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|
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|
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def sendp(self, data): |
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|
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if isinstance(data, BasePacket): |
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data = str(data) |
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|
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logging.debug(" - Sending raw packet %r", data) |
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|
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try: |
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count = self.socket.send(data, socket.MSG_DONTWAIT) |
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except socket.error, e: |
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logging.warn(" - Send with MSG_DONTWAIT failed: %s", str(e)) |
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self.socket.close() |
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self.open_socket() |
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raise e |
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|
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ldata = len(data) |
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logging.debug(" - Sent %d bytes on %s", count, self.tap) |
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if count != ldata: |
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logging.warn(" - Truncated msg: %d/%d bytes sent", |
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count, ldata) |
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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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try: |
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self.net = IPy.IP(net) |
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except ValueError, e: |
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logging.warning(" - IPy error: %s", e) |
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raise e |
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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 the netmask in textual representation |
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|
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""" |
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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 the broadcast address in textual representation |
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|
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""" |
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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 the network as an IPy.IP |
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|
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""" |
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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 the prefix length as an integer |
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|
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""" |
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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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if mac is None: |
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return None |
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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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""" Compute an EUI-64 address from an EUI-48 (MAC) address in this |
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subnet. |
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|
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""" |
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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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""" Compute an IPv6 Link-local address from an EUI-48 (MAC) address |
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|
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""" |
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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): # pylint: disable=R0902 |
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def __init__(self, data_path, dhcp_queue_num=None, # pylint: disable=R0913 |
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rs_queue_num=None, ns_queue_num=None, dhcpv6_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_domain='', |
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dhcp_server_ip=DHCP_DUMMY_SERVER_IP, dhcp_nameservers=None, |
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ra_period=DEFAULT_RA_PERIOD, ipv6_nameservers=None): |
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|
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try: |
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getattr(nfqueue.payload, 'get_physindev') |
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self.mac_indexed_clients = False |
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except AttributeError: |
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self.mac_indexed_clients = True |
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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_domain = dhcp_domain |
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self.dhcp_server_ip = dhcp_server_ip |
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self.ra_period = ra_period |
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if dhcp_nameservers is None: |
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self.dhcp_nameserver = [] |
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else: |
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self.dhcp_nameservers = dhcp_nameservers |
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|
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if ipv6_nameservers is None: |
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self.ipv6_nameservers = [] |
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else: |
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self.ipv6_nameservers = ipv6_nameservers |
383 |
|
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self.ipv6_enabled = False |
385 |
|
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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 |
393 |
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"] |
396 |
inotify_handler = ClientFileHandler(self) |
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self.notifier = pyinotify.Notifier(self.wm, inotify_handler) |
398 |
self.wm.add_watch(self.data_path, mask, rec=True) |
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|
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# NFQUEUE setup |
401 |
if dhcp_queue_num is not None: |
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self._setup_nfqueue(dhcp_queue_num, AF_INET, self.dhcp_response, 0) |
403 |
|
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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, 10) |
406 |
self.ipv6_enabled = True |
407 |
|
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if ns_queue_num is not None: |
409 |
self._setup_nfqueue(ns_queue_num, AF_INET6, self.ns_response, 10) |
410 |
self.ipv6_enabled = True |
411 |
|
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if dhcpv6_queue_num is not None: |
413 |
self._setup_nfqueue(dhcpv6_queue_num, AF_INET6, self.dhcpv6_response, 10) |
414 |
self.ipv6_enabled = True |
415 |
|
416 |
def get_binding(self, ifindex, mac): |
417 |
try: |
418 |
if self.mac_indexed_clients: |
419 |
logging.debug(" - Getting binding for mac %s", mac) |
420 |
b = self.clients[mac] |
421 |
else: |
422 |
logging.debug(" - Getting binding for ifindex %s", ifindex) |
423 |
b = self.clients[ifindex] |
424 |
return b |
425 |
except KeyError: |
426 |
logging.debug(" - No client found for mac / ifindex %s / %s", |
427 |
mac, ifindex) |
428 |
return None |
429 |
|
430 |
def _cleanup(self): |
431 |
""" Free all resources for a graceful exit |
432 |
|
433 |
""" |
434 |
logging.info("Cleaning up") |
435 |
|
436 |
logging.debug(" - Closing netfilter queues") |
437 |
for q, _ in self.nfq.values(): |
438 |
q.close() |
439 |
|
440 |
logging.debug(" - Stopping inotify watches") |
441 |
self.notifier.stop() |
442 |
|
443 |
logging.info(" - Cleanup finished") |
444 |
|
445 |
def _setup_nfqueue(self, queue_num, family, callback, pending): |
446 |
logging.info("Setting up NFQUEUE for queue %d, AF %s", |
447 |
queue_num, family) |
448 |
q = nfqueue.queue() |
449 |
q.set_callback(callback) |
450 |
q.fast_open(queue_num, family) |
451 |
q.set_queue_maxlen(5000) |
452 |
# This is mandatory for the queue to operate |
453 |
q.set_mode(nfqueue.NFQNL_COPY_PACKET) |
454 |
self.nfq[q.get_fd()] = (q, pending) |
455 |
logging.debug(" - Successfully set up NFQUEUE %d", queue_num) |
456 |
|
457 |
def build_config(self): |
458 |
self.clients.clear() |
459 |
|
460 |
for path in glob.glob(os.path.join(self.data_path, "*")): |
461 |
self.add_tap(path) |
462 |
|
463 |
self.print_clients() |
464 |
|
465 |
def get_ifindex(self, iface): |
466 |
""" Get the interface index from sysfs |
467 |
|
468 |
""" |
469 |
logging.debug(" - Getting ifindex for interface %s from sysfs", iface) |
470 |
|
471 |
path = os.path.abspath(os.path.join(SYSFS_NET, iface, "ifindex")) |
472 |
if not path.startswith(SYSFS_NET): |
473 |
return None |
474 |
|
475 |
ifindex = None |
476 |
|
477 |
try: |
478 |
f = open(path, 'r') |
479 |
except EnvironmentError: |
480 |
logging.debug(" - %s is probably down, removing", iface) |
481 |
self.remove_tap(iface) |
482 |
|
483 |
return ifindex |
484 |
|
485 |
try: |
486 |
ifindex = f.readline().strip() |
487 |
try: |
488 |
ifindex = int(ifindex) |
489 |
except ValueError, e: |
490 |
logging.warn(" - Failed to get ifindex for %s, cannot parse" |
491 |
" sysfs output '%s'", iface, ifindex) |
492 |
except EnvironmentError, e: |
493 |
logging.warn(" - Error reading %s's ifindex from sysfs: %s", |
494 |
iface, str(e)) |
495 |
self.remove_tap(iface) |
496 |
finally: |
497 |
f.close() |
498 |
|
499 |
return ifindex |
500 |
|
501 |
def get_iface_hw_addr(self, iface): |
502 |
""" Get the interface hardware address from sysfs |
503 |
|
504 |
""" |
505 |
logging.debug(" - Getting mac for iface %s", iface) |
506 |
path = os.path.abspath(os.path.join(SYSFS_NET, iface, "address")) |
507 |
if not path.startswith(SYSFS_NET): |
508 |
return None |
509 |
|
510 |
addr = None |
511 |
try: |
512 |
f = open(path, 'r') |
513 |
except EnvironmentError: |
514 |
logging.debug(" - %s is probably down, removing", iface) |
515 |
self.remove_tap(iface) |
516 |
return addr |
517 |
|
518 |
try: |
519 |
addr = f.readline().strip() |
520 |
except EnvironmentError, e: |
521 |
logging.warn(" - Failed to read hw address for %s from sysfs: %s", |
522 |
iface, str(e)) |
523 |
finally: |
524 |
f.close() |
525 |
|
526 |
return addr |
527 |
|
528 |
def add_tap(self, path): |
529 |
""" Add an interface to monitor |
530 |
|
531 |
""" |
532 |
tap = os.path.basename(path) |
533 |
|
534 |
logging.info("Updating configuration for %s", tap) |
535 |
b = parse_binding_file(path) |
536 |
if b is None: |
537 |
return |
538 |
ifindex = self.get_ifindex(b.tap) |
539 |
|
540 |
if ifindex is None: |
541 |
logging.warn(" - Stale configuration for %s found", tap) |
542 |
else: |
543 |
if b.is_valid(): |
544 |
if self.mac_indexed_clients: |
545 |
self.clients[b.mac] = b |
546 |
else: |
547 |
self.clients[ifindex] = b |
548 |
logging.debug(" - Added client:") |
549 |
logging.debug(" + %5s: %10s %20s %7s %15s", |
550 |
ifindex, b.hostname, b.mac, b.tap, b.ip) |
551 |
|
552 |
def remove_tap(self, tap): |
553 |
""" Cleanup clients on a removed interface |
554 |
|
555 |
""" |
556 |
try: |
557 |
for k, cl in self.clients.items(): |
558 |
if cl.tap == tap: |
559 |
logging.info("Removing client %s and closing socket on %s", |
560 |
cl.hostname, cl.tap) |
561 |
logging.debug(" - %10s | %10s %20s %10s %20s", |
562 |
k, cl.hostname, cl.mac, cl.tap, cl.ip) |
563 |
cl.socket.close() |
564 |
del self.clients[k] |
565 |
except: |
566 |
logging.debug("Client on %s disappeared!!!", tap) |
567 |
|
568 |
|
569 |
def dhcp_response(self, arg1, arg2=None): # pylint: disable=W0613,R0914 |
570 |
""" Generate a reply to bnetfilter-queue-deva BOOTP/DHCP request |
571 |
|
572 |
""" |
573 |
logging.info(" * Processing pending DHCP request") |
574 |
# Workaround for supporting both squeezy's nfqueue-bindings-python |
575 |
# and wheezy's python-nfqueue because for some reason the function's |
576 |
# signature has changed and has broken compatibility |
577 |
# See bug http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718894 |
578 |
if arg2: |
579 |
payload = arg2 |
580 |
else: |
581 |
payload = arg1 |
582 |
# Decode the response - NFQUEUE relays IP packets |
583 |
pkt = IP(payload.get_data()) |
584 |
#logging.debug(pkt.show()) |
585 |
|
586 |
# Get the client MAC address |
587 |
resp = pkt.getlayer(BOOTP).copy() |
588 |
hlen = resp.hlen |
589 |
mac = resp.chaddr[:hlen].encode("hex") |
590 |
mac, _ = re.subn(r'([0-9a-fA-F]{2})', r'\1:', mac, hlen - 1) |
591 |
|
592 |
# Server responses are always BOOTREPLYs |
593 |
resp.op = "BOOTREPLY" |
594 |
del resp.payload |
595 |
|
596 |
indev = get_indev(payload) |
597 |
|
598 |
binding = self.get_binding(indev, mac) |
599 |
if binding is None: |
600 |
# We don't know anything about this interface, so accept the packet |
601 |
# and return |
602 |
logging.debug(" - Ignoring DHCP request on unknown iface %s", indev) |
603 |
# We don't know what to do with this packet, so let the kernel |
604 |
# handle it |
605 |
payload.set_verdict(nfqueue.NF_ACCEPT) |
606 |
return |
607 |
|
608 |
# Signal the kernel that it shouldn't further process the packet |
609 |
payload.set_verdict(nfqueue.NF_DROP) |
610 |
|
611 |
if mac != binding.mac: |
612 |
logging.warn(" - Recieved spoofed DHCP request: mac %s, indev %s", |
613 |
mac, indev) |
614 |
return |
615 |
|
616 |
if not binding.ip: |
617 |
logging.info(" - No IP found in binding file.") |
618 |
return |
619 |
|
620 |
logging.info(" - Generating DHCP response:" |
621 |
" host %s, mac %s, tap %s, indev %s", |
622 |
binding.hostname, mac, binding.tap, indev) |
623 |
|
624 |
|
625 |
resp = Ether(dst=mac, src=self.get_iface_hw_addr(binding.indev))/\ |
626 |
IP(src=DHCP_DUMMY_SERVER_IP, dst=binding.ip)/\ |
627 |
UDP(sport=pkt.dport, dport=pkt.sport)/resp |
628 |
subnet = binding.net |
629 |
|
630 |
if not DHCP in pkt: |
631 |
logging.warn(" - Invalid request from %s on %s, no DHCP" |
632 |
" payload found", binding.mac, binding.tap) |
633 |
return |
634 |
|
635 |
dhcp_options = [] |
636 |
requested_addr = binding.ip |
637 |
for opt in pkt[DHCP].options: |
638 |
if type(opt) is tuple and opt[0] == "message-type": |
639 |
req_type = opt[1] |
640 |
if type(opt) is tuple and opt[0] == "requested_addr": |
641 |
requested_addr = opt[1] |
642 |
|
643 |
logging.info(" - %s from %s on %s", DHCP_TYPES.get(req_type, "UNKNOWN"), |
644 |
binding.mac, binding.tap) |
645 |
|
646 |
if self.dhcp_domain: |
647 |
domainname = self.dhcp_domain |
648 |
else: |
649 |
domainname = binding.hostname.split('.', 1)[-1] |
650 |
|
651 |
if req_type == DHCPREQUEST and requested_addr != binding.ip: |
652 |
resp_type = DHCPNAK |
653 |
logging.info(" - Sending DHCPNAK to %s on %s: requested %s" |
654 |
" instead of %s", binding.mac, binding.tap, |
655 |
requested_addr, binding.ip) |
656 |
|
657 |
elif req_type in (DHCPDISCOVER, DHCPREQUEST): |
658 |
resp_type = DHCP_REQRESP[req_type] |
659 |
resp.yiaddr = binding.ip |
660 |
dhcp_options += [ |
661 |
("hostname", binding.hostname), |
662 |
("domain", domainname), |
663 |
("broadcast_address", str(subnet.broadcast)), |
664 |
("subnet_mask", str(subnet.netmask)), |
665 |
("renewal_time", self.lease_renewal), |
666 |
("lease_time", self.lease_lifetime), |
667 |
] |
668 |
if subnet.gw: |
669 |
dhcp_options += [("router", subnet.gw)] |
670 |
dhcp_options += [("name_server", x) for x in self.dhcp_nameservers] |
671 |
|
672 |
elif req_type == DHCPINFORM: |
673 |
resp_type = DHCP_REQRESP[req_type] |
674 |
dhcp_options += [ |
675 |
("hostname", binding.hostname), |
676 |
("domain", domainname), |
677 |
] |
678 |
dhcp_options += [("name_server", x) for x in self.dhcp_nameservers] |
679 |
|
680 |
elif req_type == DHCPRELEASE: |
681 |
# Log and ignore |
682 |
logging.info(" - DHCPRELEASE from %s on %s", |
683 |
binding.hostname, binding.tap) |
684 |
return |
685 |
|
686 |
# Finally, always add the server identifier and end options |
687 |
dhcp_options += [ |
688 |
("message-type", resp_type), |
689 |
("server_id", DHCP_DUMMY_SERVER_IP), |
690 |
"end" |
691 |
] |
692 |
resp /= DHCP(options=dhcp_options) |
693 |
|
694 |
logging.info(" - %s to %s (%s) on %s", DHCP_TYPES[resp_type], mac, |
695 |
binding.ip, binding.tap) |
696 |
try: |
697 |
binding.sendp(resp) |
698 |
except socket.error, e: |
699 |
logging.warn(" - DHCP response on %s (%s) failed: %s", |
700 |
binding.tap, binding.hostname, str(e)) |
701 |
except Exception, e: |
702 |
logging.warn(" - Unkown error during DHCP response on %s (%s): %s", |
703 |
binding.tap, binding.hostname, str(e)) |
704 |
|
705 |
def dhcpv6_response(self, arg1, arg2=None): # pylint: disable=W0613 |
706 |
|
707 |
logging.info(" * Processing pending DHCPv6 request") |
708 |
# Workaround for supporting both squeezy's nfqueue-bindings-python |
709 |
# and wheezy's python-nfqueue because for some reason the function's |
710 |
# signature has changed and has broken compatibility |
711 |
# See bug http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718894 |
712 |
if arg2: |
713 |
payload = arg2 |
714 |
else: |
715 |
payload = arg1 |
716 |
pkt = IPv6(payload.get_data()) |
717 |
indev = get_indev(payload) |
718 |
|
719 |
#TODO: figure out how to find the src mac |
720 |
mac = None |
721 |
binding = self.get_binding(indev, mac) |
722 |
if binding is None: |
723 |
# We don't know anything about this interface, so accept the packet |
724 |
# and return |
725 |
logging.debug(" - Ignoring dhcpv6 request for mac %s", mac) |
726 |
# We don't know what to do with this packet, so let the kernel |
727 |
# handle it |
728 |
payload.set_verdict(nfqueue.NF_ACCEPT) |
729 |
return |
730 |
|
731 |
# Signal the kernel that it shouldn't further process the packet |
732 |
payload.set_verdict(nfqueue.NF_DROP) |
733 |
|
734 |
subnet = binding.net6 |
735 |
|
736 |
indevmac = self.get_iface_hw_addr(binding.indev) |
737 |
ifll = subnet.make_ll64(indevmac) |
738 |
if ifll is None: |
739 |
return |
740 |
|
741 |
ofll = subnet.make_ll64(binding.mac) |
742 |
if ofll is None: |
743 |
return |
744 |
|
745 |
logging.info(" - Generating DHCPv6 response for host %s (mac %s) on tap %s", |
746 |
binding.hostname, binding.mac, binding.tap) |
747 |
|
748 |
resp = Ether(src=indevmac, dst=binding.mac)/\ |
749 |
IPv6(tc=192, src=str(ifll), dst=str(ofll))/\ |
750 |
UDP(sport=pkt.dport, dport=pkt.sport)/\ |
751 |
DHCP6_Reply(trid=pkt[DHCP6_InfoRequest].trid)/\ |
752 |
DHCP6OptClientId(duid=pkt[DHCP6OptClientId].duid)/\ |
753 |
DHCP6OptServerId(duid=DUID_LLT(lladdr=indevmac, timeval=time.time()))/\ |
754 |
DHCP6OptDNSServers(dnsservers=self.ipv6_nameservers, |
755 |
optlen=16 * len(self.ipv6_nameservers)) |
756 |
|
757 |
try: |
758 |
binding.sendp(resp) |
759 |
except socket.error, e: |
760 |
logging.warn(" - DHCPv6 on %s (%s) failed: %s", |
761 |
binding.tap, binding.hostname, str(e)) |
762 |
except Exception, e: |
763 |
logging.warn(" - Unkown error during DHCPv6 on %s (%s): %s", |
764 |
binding.tap, binding.hostname, str(e)) |
765 |
|
766 |
|
767 |
def rs_response(self, arg1, arg2=None): # pylint: disable=W0613 |
768 |
""" Generate a reply to a BOOTP/DHCP request |
769 |
|
770 |
""" |
771 |
logging.info(" * Processing pending RS request") |
772 |
# Workaround for supporting both squeezy's nfqueue-bindings-python |
773 |
# and wheezy's python-nfqueue because for some reason the function's |
774 |
# signature has changed and has broken compatibility |
775 |
# See bug http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718894 |
776 |
if arg2: |
777 |
payload = arg2 |
778 |
else: |
779 |
payload = arg1 |
780 |
pkt = IPv6(payload.get_data()) |
781 |
#logging.debug(pkt.show()) |
782 |
try: |
783 |
mac = pkt.lladdr |
784 |
except: |
785 |
logging.debug(" - Cannot obtain lladdr in rs") |
786 |
return |
787 |
|
788 |
indev = get_indev(payload) |
789 |
|
790 |
binding = self.get_binding(indev, mac) |
791 |
if binding is None: |
792 |
# We don't know anything about this interface, so accept the packet |
793 |
# and return |
794 |
logging.debug(" - Ignoring router solicitation on for mac %s", mac) |
795 |
# We don't know what to do with this packet, so let the kernel |
796 |
# handle it |
797 |
payload.set_verdict(nfqueue.NF_ACCEPT) |
798 |
return |
799 |
|
800 |
# Signal the kernel that it shouldn't further process the packet |
801 |
payload.set_verdict(nfqueue.NF_DROP) |
802 |
|
803 |
if mac != binding.mac: |
804 |
logging.warn(" - Received spoofed RS request: mac %s, tap %s", |
805 |
mac, binding.tap) |
806 |
return |
807 |
|
808 |
subnet = binding.net6 |
809 |
|
810 |
if subnet.net is None: |
811 |
logging.debug(" - No IPv6 network assigned for tap %s", binding.tap) |
812 |
return |
813 |
|
814 |
indevmac = self.get_iface_hw_addr(binding.indev) |
815 |
ifll = subnet.make_ll64(indevmac) |
816 |
if ifll is None: |
817 |
return |
818 |
|
819 |
logging.info(" - Generating RA for host %s (mac %s) on tap %s", |
820 |
binding.hostname, mac, binding.tap) |
821 |
|
822 |
resp = Ether(src=indevmac)/\ |
823 |
IPv6(src=str(ifll))/ICMPv6ND_RA(O=1, routerlifetime=14400)/\ |
824 |
ICMPv6NDOptPrefixInfo(prefix=str(subnet.prefix), |
825 |
prefixlen=subnet.prefixlen) |
826 |
|
827 |
if self.ipv6_nameservers: |
828 |
resp /= ICMPv6NDOptRDNSS(dns=self.ipv6_nameservers, |
829 |
lifetime=self.ra_period * 3) |
830 |
|
831 |
try: |
832 |
binding.sendp(resp) |
833 |
except socket.error, e: |
834 |
logging.warn(" - RA on %s (%s) failed: %s", |
835 |
binding.tap, binding.hostname, str(e)) |
836 |
except Exception, e: |
837 |
logging.warn(" - Unkown error during RA on %s (%s): %s", |
838 |
binding.tap, binding.hostname, str(e)) |
839 |
|
840 |
def ns_response(self, arg1, arg2=None): # pylint: disable=W0613 |
841 |
""" Generate a reply to an ICMPv6 neighbor solicitation |
842 |
|
843 |
""" |
844 |
|
845 |
logging.info(" * Processing pending NS request") |
846 |
# Workaround for supporting both squeezy's nfqueue-bindings-python |
847 |
# and wheezy's python-nfqueue because for some reason the function's |
848 |
# signature has changed and has broken compatibility |
849 |
# See bug http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718894 |
850 |
if arg2: |
851 |
payload = arg2 |
852 |
else: |
853 |
payload = arg1 |
854 |
|
855 |
ns = IPv6(payload.get_data()) |
856 |
#logging.debug(ns.show()) |
857 |
try: |
858 |
mac = ns.lladdr |
859 |
except: |
860 |
logging.debug(" - Cannot obtain lladdr from ns") |
861 |
return |
862 |
|
863 |
|
864 |
indev = get_indev(payload) |
865 |
|
866 |
binding = self.get_binding(indev, mac) |
867 |
if binding is None: |
868 |
# We don't know anything about this interface, so accept the packet |
869 |
# and return |
870 |
logging.debug(" - Ignoring neighbour solicitation for eui64 %s", |
871 |
ns.tgt) |
872 |
# We don't know what to do with this packet, so let the kernel |
873 |
# handle it |
874 |
payload.set_verdict(nfqueue.NF_ACCEPT) |
875 |
return |
876 |
|
877 |
payload.set_verdict(nfqueue.NF_DROP) |
878 |
|
879 |
if mac != binding.mac: |
880 |
logging.warn(" - Received spoofed NS request" |
881 |
" for mac %s from tap %s", mac, binding.tap) |
882 |
return |
883 |
|
884 |
subnet = binding.net6 |
885 |
if subnet.net is None: |
886 |
logging.debug(" - No IPv6 network assigned for the interface") |
887 |
return |
888 |
|
889 |
indevmac = self.get_iface_hw_addr(binding.indev) |
890 |
|
891 |
ifll = subnet.make_ll64(indevmac) |
892 |
if ifll is None: |
893 |
return |
894 |
|
895 |
if not (subnet.net.overlaps(ns.tgt) or str(ns.tgt) == str(ifll)): |
896 |
logging.debug(" - Received NS for a non-routable IP (%s)", ns.tgt) |
897 |
return 1 |
898 |
|
899 |
logging.info(" - Generating NA for host %s (mac %s) on tap %s", |
900 |
binding.hostname, mac, binding.tap) |
901 |
|
902 |
resp = Ether(src=indevmac, dst=binding.mac)/\ |
903 |
IPv6(src=str(ifll), dst=ns.src)/\ |
904 |
ICMPv6ND_NA(R=1, O=0, S=1, tgt=ns.tgt)/\ |
905 |
ICMPv6NDOptDstLLAddr(lladdr=indevmac) |
906 |
|
907 |
try: |
908 |
binding.sendp(resp) |
909 |
except socket.error, e: |
910 |
logging.warn(" - NA on %s (%s) failed: %s", |
911 |
binding.tap, binding.hostname, str(e)) |
912 |
except Exception, e: |
913 |
logging.warn(" - Unkown error during periodic NA to %s (%s): %s", |
914 |
binding.tap, binding.hostname, str(e)) |
915 |
|
916 |
def send_periodic_ra(self): |
917 |
# Use a separate thread as this may take a _long_ time with |
918 |
# many interfaces and we want to be responsive in the mean time |
919 |
threading.Thread(target=self._send_periodic_ra).start() |
920 |
|
921 |
def _send_periodic_ra(self): |
922 |
logging.info("Sending out periodic RAs") |
923 |
start = time.time() |
924 |
i = 0 |
925 |
for binding in self.clients.values(): |
926 |
tap = binding.tap |
927 |
indev = binding.indev |
928 |
# mac = binding.mac |
929 |
subnet = binding.net6 |
930 |
if subnet.net is None: |
931 |
logging.debug(" - Skipping periodic RA on interface %s," |
932 |
" as it is not IPv6-connected", tap) |
933 |
continue |
934 |
indevmac = self.get_iface_hw_addr(indev) |
935 |
ifll = subnet.make_ll64(indevmac) |
936 |
if ifll is None: |
937 |
continue |
938 |
resp = Ether(src=indevmac)/\ |
939 |
IPv6(src=str(ifll))/ICMPv6ND_RA(routerlifetime=14400)/\ |
940 |
ICMPv6NDOptPrefixInfo(prefix=str(subnet.prefix), |
941 |
prefixlen=subnet.prefixlen) |
942 |
if self.ipv6_nameservers: |
943 |
resp /= ICMPv6NDOptRDNSS(dns=self.ipv6_nameservers, |
944 |
lifetime=self.ra_period * 3) |
945 |
try: |
946 |
binding.sendp(resp) |
947 |
except socket.error, e: |
948 |
logging.warn(" - Periodic RA on %s (%s) failed: %s", |
949 |
tap, binding.hostname, str(e)) |
950 |
except Exception, e: |
951 |
logging.warn(" - Unkown error during periodic RA on %s (%s):" |
952 |
" %s", tap, binding.hostname, str(e)) |
953 |
i += 1 |
954 |
logging.info(" - Sent %d RAs in %.2f seconds", i, time.time() - start) |
955 |
|
956 |
def serve(self): |
957 |
""" Safely perform the main loop, freeing all resources upon exit |
958 |
|
959 |
""" |
960 |
try: |
961 |
self._serve() |
962 |
finally: |
963 |
self._cleanup() |
964 |
|
965 |
def _serve(self): |
966 |
""" Loop forever, serving DHCP requests |
967 |
|
968 |
""" |
969 |
self.build_config() |
970 |
|
971 |
# Yes, we are accessing _fd directly, but it's the only way to have a |
972 |
# single select() loop ;-) |
973 |
iwfd = self.notifier._fd # pylint: disable=W0212 |
974 |
|
975 |
start = time.time() |
976 |
if self.ipv6_enabled: |
977 |
timeout = self.ra_period |
978 |
self.send_periodic_ra() |
979 |
else: |
980 |
timeout = None |
981 |
|
982 |
while True: |
983 |
try: |
984 |
rlist, _, xlist = select.select(self.nfq.keys() + [iwfd], |
985 |
[], [], timeout) |
986 |
except select.error, e: |
987 |
if e[0] == errno.EINTR: |
988 |
logging.debug("select() got interrupted") |
989 |
continue |
990 |
|
991 |
if xlist: |
992 |
logging.warn("Warning: Exception on %s", |
993 |
", ".join([str(fd) for fd in xlist])) |
994 |
|
995 |
if rlist: |
996 |
if iwfd in rlist: |
997 |
# First check if there are any inotify (= configuration change) |
998 |
# events |
999 |
self.notifier.read_events() |
1000 |
self.notifier.process_events() |
1001 |
rlist.remove(iwfd) |
1002 |
|
1003 |
logging.debug("Pending requests on fds %s", rlist) |
1004 |
|
1005 |
for fd in rlist: |
1006 |
try: |
1007 |
q, num = self.nfq[fd] |
1008 |
cnt = q.process_pending(num) |
1009 |
logging.debug(" * Processed %d requests on NFQUEUE" |
1010 |
" with fd %d", cnt, fd) |
1011 |
except RuntimeError, e: |
1012 |
logging.warn("Error processing fd %d: %s", fd, str(e)) |
1013 |
except Exception, e: |
1014 |
logging.warn("Unknown error processing fd %d: %s", |
1015 |
fd, str(e)) |
1016 |
|
1017 |
if self.ipv6_enabled: |
1018 |
# Calculate the new timeout |
1019 |
timeout = self.ra_period - (time.time() - start) |
1020 |
|
1021 |
if timeout <= 0: |
1022 |
start = time.time() |
1023 |
self.send_periodic_ra() |
1024 |
timeout = self.ra_period - (time.time() - start) |
1025 |
|
1026 |
def print_clients(self): |
1027 |
logging.info("%10s %20s %20s %10s %20s", |
1028 |
'Key', 'Client', 'MAC', 'TAP', 'IP') |
1029 |
for k, cl in self.clients.items(): |
1030 |
logging.info("%10s | %20s %20s %10s %20s", |
1031 |
k, cl.hostname, cl.mac, cl.tap, cl.ip) |
1032 |
|
1033 |
|
1034 |
|
1035 |
if __name__ == "__main__": |
1036 |
import capng |
1037 |
import optparse |
1038 |
from cStringIO import StringIO |
1039 |
from pwd import getpwnam, getpwuid |
1040 |
from configobj import ConfigObj, ConfigObjError, flatten_errors |
1041 |
|
1042 |
import validate |
1043 |
|
1044 |
validator = validate.Validator() |
1045 |
|
1046 |
def is_ip_list(value, family=4): |
1047 |
try: |
1048 |
family = int(family) |
1049 |
except ValueError: |
1050 |
raise validate.VdtParamError(family) |
1051 |
if isinstance(value, (str, unicode)): |
1052 |
value = [value] |
1053 |
if not isinstance(value, list): |
1054 |
raise validate.VdtTypeError(value) |
1055 |
|
1056 |
for entry in value: |
1057 |
try: |
1058 |
ip = IPy.IP(entry) |
1059 |
except ValueError: |
1060 |
raise validate.VdtValueError(entry) |
1061 |
|
1062 |
if ip.version() != family: |
1063 |
raise validate.VdtValueError(entry) |
1064 |
return value |
1065 |
|
1066 |
validator.functions["ip_addr_list"] = is_ip_list |
1067 |
config_spec = StringIO(CONFIG_SPEC) |
1068 |
|
1069 |
parser = optparse.OptionParser() |
1070 |
parser.add_option("-c", "--config", dest="config_file", |
1071 |
help="The location of the data files", metavar="FILE", |
1072 |
default=DEFAULT_CONFIG) |
1073 |
parser.add_option("-d", "--debug", action="store_true", dest="debug", |
1074 |
help="Turn on debugging messages") |
1075 |
parser.add_option("-f", "--foreground", action="store_false", |
1076 |
dest="daemonize", default=True, |
1077 |
help="Do not daemonize, stay in the foreground") |
1078 |
|
1079 |
opts, args = parser.parse_args() |
1080 |
|
1081 |
try: |
1082 |
config = ConfigObj(opts.config_file, configspec=config_spec) |
1083 |
except ConfigObjError, err: |
1084 |
sys.stderr.write("Failed to parse config file %s: %s" % |
1085 |
(opts.config_file, str(err))) |
1086 |
sys.exit(1) |
1087 |
|
1088 |
results = config.validate(validator) |
1089 |
if results != True: |
1090 |
logging.fatal("Configuration file validation failed! See errors below:") |
1091 |
for (section_list, key, unused) in flatten_errors(config, results): |
1092 |
if key is not None: |
1093 |
logging.fatal(" '%s' in section '%s' failed validation", |
1094 |
key, ", ".join(section_list)) |
1095 |
else: |
1096 |
logging.fatal(" Section '%s' is missing", |
1097 |
", ".join(section_list)) |
1098 |
sys.exit(1) |
1099 |
|
1100 |
try: |
1101 |
uid = getpwuid(config["general"].as_int("user")) |
1102 |
except ValueError: |
1103 |
uid = getpwnam(config["general"]["user"]) |
1104 |
|
1105 |
# Keep only the capabilities we need |
1106 |
# CAP_NET_ADMIN: we need to send nfqueue packet verdicts to a netlinkgroup |
1107 |
# CAP_NET_RAW: we need to reopen socket in case the buffer gets full |
1108 |
# CAP_SETPCAP: needed by capng_change_id() |
1109 |
capng.capng_clear(capng.CAPNG_SELECT_BOTH) |
1110 |
capng.capng_update(capng.CAPNG_ADD, |
1111 |
capng.CAPNG_EFFECTIVE | capng.CAPNG_PERMITTED, |
1112 |
capng.CAP_NET_ADMIN) |
1113 |
capng.capng_update(capng.CAPNG_ADD, |
1114 |
capng.CAPNG_EFFECTIVE | capng.CAPNG_PERMITTED, |
1115 |
capng.CAP_NET_RAW) |
1116 |
capng.capng_update(capng.CAPNG_ADD, |
1117 |
capng.CAPNG_EFFECTIVE | capng.CAPNG_PERMITTED, |
1118 |
capng.CAP_SETPCAP) |
1119 |
# change uid |
1120 |
capng.capng_change_id(uid.pw_uid, uid.pw_gid, |
1121 |
capng.CAPNG_DROP_SUPP_GRP | \ |
1122 |
capng.CAPNG_CLEAR_BOUNDING) |
1123 |
|
1124 |
logger = logging.getLogger() |
1125 |
if opts.debug: |
1126 |
logger.setLevel(logging.DEBUG) |
1127 |
else: |
1128 |
logger.setLevel(logging.INFO) |
1129 |
|
1130 |
if opts.daemonize: |
1131 |
logfile = os.path.join(config["general"]["logdir"], LOG_FILENAME) |
1132 |
handler = logging.handlers.WatchedFileHandler(logfile) |
1133 |
else: |
1134 |
handler = logging.StreamHandler() |
1135 |
|
1136 |
handler.setFormatter(logging.Formatter(LOG_FORMAT)) |
1137 |
logger.addHandler(handler) |
1138 |
|
1139 |
# Rename this process so 'ps' output looks like |
1140 |
# this is a native executable. |
1141 |
# NOTE: due to a bug in python-setproctitle, one cannot yet |
1142 |
# set individual values for command-line arguments, so only show |
1143 |
# the name of the executable instead. |
1144 |
# setproctitle.setproctitle("\x00".join(sys.argv)) |
1145 |
setproctitle.setproctitle(sys.argv[0]) |
1146 |
|
1147 |
if opts.daemonize: |
1148 |
pidfile = daemon.pidlockfile.TimeoutPIDLockFile( |
1149 |
config["general"]["pidfile"], 10) |
1150 |
# Remove any stale PID files, left behind by previous invocations |
1151 |
if daemon.runner.is_pidfile_stale(pidfile): |
1152 |
logger.warning("Removing stale PID lock file %s", pidfile.path) |
1153 |
pidfile.break_lock() |
1154 |
|
1155 |
d = daemon.DaemonContext(pidfile=pidfile, |
1156 |
umask=0022, |
1157 |
stdout=handler.stream, |
1158 |
stderr=handler.stream, |
1159 |
files_preserve=[handler.stream]) |
1160 |
try: |
1161 |
d.open() |
1162 |
except (daemon.pidlockfile.AlreadyLocked, LockTimeout): |
1163 |
logger.critical("Failed to lock pidfile %s," |
1164 |
" another instance running?", pidfile.path) |
1165 |
sys.exit(1) |
1166 |
|
1167 |
logging.info("Starting up") |
1168 |
logging.info("Running as %s (uid:%d, gid: %d)", |
1169 |
config["general"]["user"], uid.pw_uid, uid.pw_gid) |
1170 |
|
1171 |
proxy_opts = {} |
1172 |
if config["dhcp"].as_bool("enable_dhcp"): |
1173 |
proxy_opts.update({ |
1174 |
"dhcp_queue_num": config["dhcp"].as_int("dhcp_queue"), |
1175 |
"dhcp_lease_lifetime": config["dhcp"].as_int("lease_lifetime"), |
1176 |
"dhcp_lease_renewal": config["dhcp"].as_int("lease_renewal"), |
1177 |
"dhcp_server_ip": config["dhcp"]["server_ip"], |
1178 |
"dhcp_nameservers": config["dhcp"]["nameservers"], |
1179 |
"dhcp_domain": config["dhcp"]["domain"], |
1180 |
}) |
1181 |
|
1182 |
if config["ipv6"].as_bool("enable_ipv6"): |
1183 |
proxy_opts.update({ |
1184 |
"dhcpv6_queue_num": config["ipv6"].as_int("dhcp_queue"), |
1185 |
"rs_queue_num": config["ipv6"].as_int("rs_queue"), |
1186 |
"ns_queue_num": config["ipv6"].as_int("ns_queue"), |
1187 |
"ra_period": config["ipv6"].as_int("ra_period"), |
1188 |
"ipv6_nameservers": config["ipv6"]["nameservers"], |
1189 |
}) |
1190 |
|
1191 |
# pylint: disable=W0142 |
1192 |
proxy = VMNetProxy(data_path=config["general"]["datapath"], **proxy_opts) |
1193 |
|
1194 |
logging.info("Ready to serve requests") |
1195 |
|
1196 |
|
1197 |
def debug_handler(signum, _): |
1198 |
logging.debug('Received signal %d. Printing proxy state...', signum) |
1199 |
proxy.print_clients() |
1200 |
|
1201 |
# Set the signal handler for debuging clients |
1202 |
signal.signal(signal.SIGUSR1, debug_handler) |
1203 |
signal.siginterrupt(signal.SIGUSR1, False) |
1204 |
|
1205 |
try: |
1206 |
proxy.serve() |
1207 |
except Exception: |
1208 |
if opts.daemonize: |
1209 |
exc = "".join(traceback.format_exception(*sys.exc_info())) |
1210 |
logging.critical(exc) |
1211 |
raise |
1212 |
|
1213 |
|
1214 |
# vim: set ts=4 sts=4 sw=4 et : |