import os
import re
+import sys
import glob
import time
import logging
import logging.handlers
import threading
+import traceback
import subprocess
import daemon
+import daemon.pidlockfile
import nfqueue
import pyinotify
from select import select
from socket import AF_INET, AF_INET6
+from scapy.data import ETH_P_ALL
+from scapy.packet import BasePacket
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP
-from scapy.layers.inet6 import *
+from scapy.layers.inet6 import IPv6, ICMPv6ND_RA, ICMPv6ND_NA, \
+ ICMPv6NDOptDstLLAddr, \
+ ICMPv6NDOptPrefixInfo, \
+ ICMPv6NDOptRDNSS
from scapy.layers.dhcp import BOOTP, DHCP
-from scapy.sendrecv import sendp
DEFAULT_CONFIG = "/etc/nfdhcpd/nfdhcpd.conf"
DEFAULT_PATH = "/var/run/ganeti-dhcpd"
server_ip = ip_addr()
dhcp_queue = integer(min=0, max=65535)
nameservers = ip_addr_list(family=4)
+domain = string(default=None)
[ipv6]
enable_ipv6 = boolean(default=True)
}
+def get_indev(payload):
+ try:
+ indev_ifindex = payload.get_physindev()
+ if indev_ifindex:
+ logging.debug("Incomming packet from bridge %s", indev_ifindex)
+ return indev_ifindex
+ except AttributeError:
+ #TODO: return error value
+ logging.debug("No get_physindev supported")
+ return 0
+
+ indev_ifindex = payload.get_indev()
+ logging.debug("Incomming packet from tap %s", indev_ifindex)
+
+ return indev_ifindex
+
+def get_binding(proxy, ifindex, mac):
+ try:
+ if proxy.mac_indexed_clients:
+ b = proxy.clients[mac]
+ else:
+ b = proxy.clients[ifindex]
+ return b
+ except KeyError:
+ logging.debug("No client found for mac/ifindex %s/%s", mac, ifindex)
+ return None
+
+def parse_binding_file(path):
+ """ Read a client configuration from a tap file
+
+ """
+ try:
+ iffile = open(path, 'r')
+ except EnvironmentError, e:
+ logging.warn("Unable to open binding file %s: %s", path, str(e))
+ return None
+
+ tap = os.path.basename(path)
+ indev = None
+ mac = None
+ ip = None
+ hostname = None
+ subnet = None
+ gateway = None
+ subnet6 = None
+ gateway6 = None
+ eui64 = None
+
+ def get_value(line):
+ v = line.strip().split('=')[1]
+ if v == '':
+ return None
+ return v
+
+ for line in iffile:
+ if line.startswith("IP="):
+ ip = get_value(line)
+ elif line.startswith("MAC="):
+ mac = get_value(line)
+ elif line.startswith("HOSTNAME="):
+ hostname = get_value(line)
+ elif line.startswith("INDEV="):
+ indev = get_value(line)
+ elif line.startswith("SUBNET="):
+ subnet = get_value(line)
+ elif line.startswith("GATEWAY="):
+ gateway = get_value(line)
+ elif line.startswith("SUBNET6="):
+ subnet6 = get_value(line)
+ elif line.startswith("GATEWAY6="):
+ gateway6 = get_value(line)
+ elif line.startswith("EUI64="):
+ eui64 = get_value(line)
+
+ return Client(tap=tap, mac=mac, ip=ip,
+ hostname=hostname, indev=indev, subnet=subnet,
+ gateway=gateway, subnet6=subnet6, gateway6=gateway6, eui64=eui64 )
+
class ClientFileHandler(pyinotify.ProcessEvent):
def __init__(self, server):
pyinotify.ProcessEvent.__init__(self)
self.server = server
- def process_IN_DELETE(self, event):
- self.server.remove_iface(event.name)
+ def process_IN_DELETE(self, event): # pylint: disable=C0103
+ """ Delete file handler
+
+ Currently this removes an interface from the watch list
- def process_IN_CLOSE_WRITE(self, event):
- self.server.add_iface(os.path.join(event.path, event.name))
+ """
+ self.server.remove_tap(event.name)
+
+ def process_IN_CLOSE_WRITE(self, event): # pylint: disable=C0103
+ """ Add file handler
+
+ Currently this adds an interface to the watch list
+
+ """
+ self.server.add_tap(os.path.join(event.path, event.name))
class Client(object):
- def __init__(self, mac=None, ips=None, link=None, hostname=None):
+ def __init__(self, tap=None, indev=None, mac=None, ip=None, hostname=None,
+ subnet=None, gateway=None, subnet6=None, gateway6=None, eui64=None ):
self.mac = mac
- self.ips = ips
+ self.ip = ip
self.hostname = hostname
- self.link = link
- self.iface = None
-
- @property
- def ip(self):
- return self.ips[0]
+ self.indev = indev
+ self.tap = tap
+ self.subnet = subnet
+ self.gateway = gateway
+ self.net = Subnet(net=subnet, gw=gateway, dev=tap)
+ self.subnet6 = subnet6
+ self.gateway6 = gateway6
+ self.net6 = Subnet(net=subnet6, gw=gateway6, dev=tap)
+ self.eui64 = eui64
def is_valid(self):
- return self.mac is not None and self.ips is not None\
+ return self.mac is not None and self.ip is not None\
and self.hostname is not None
@property
def netmask(self):
+ """ Return the netmask in textual representation
+
+ """
return str(self.net.netmask())
@property
def broadcast(self):
+ """ Return the broadcast address in textual representation
+
+ """
return str(self.net.broadcast())
@property
def prefix(self):
+ """ Return the network as an IPy.IP
+
+ """
return self.net.net()
@property
def prefixlen(self):
+ """ Return the prefix length as an integer
+
+ """
return self.net.prefixlen()
@staticmethod
return IPy.IP(":".join(prefix))
def make_eui64(self, mac):
+ """ Compute an EUI-64 address from an EUI-48 (MAC) address in this
+ subnet.
+
+ """
return self._make_eui64(self.net, mac)
def make_ll64(self, mac):
+ """ Compute an IPv6 Link-local address from an EUI-48 (MAC) address
+
+ """
return self._make_eui64("fe80::", mac)
-class VMNetProxy(object):
- def __init__(self, data_path, dhcp_queue_num=None,
+class VMNetProxy(object): # pylint: disable=R0902
+ def __init__(self, data_path, dhcp_queue_num=None, # pylint: disable=R0913
rs_queue_num=None, ns_queue_num=None,
dhcp_lease_lifetime=DEFAULT_LEASE_LIFETIME,
dhcp_lease_renewal=DEFAULT_LEASE_RENEWAL,
- dhcp_server_ip=DHCP_DUMMY_SERVER_IP, dhcp_nameservers = [],
- ra_period=DEFAULT_RA_PERIOD, ipv6_nameservers = []):
+ dhcp_domain='',
+ dhcp_server_ip=DHCP_DUMMY_SERVER_IP, dhcp_nameservers=None,
+ ra_period=DEFAULT_RA_PERIOD, ipv6_nameservers=None):
+ try:
+ getattr(nfqueue.payload, 'get_physindev')
+ self.mac_indexed_clients = False
+ except AttributeError:
+ self.mac_indexed_clients = True
self.data_path = data_path
self.lease_lifetime = dhcp_lease_lifetime
self.lease_renewal = dhcp_lease_renewal
+ self.dhcp_domain = dhcp_domain
self.dhcp_server_ip = dhcp_server_ip
self.ra_period = ra_period
- self.dhcp_nameservers = dhcp_nameservers
- self.ipv6_nameservers = ipv6_nameservers
+ if dhcp_nameservers is None:
+ self.dhcp_nameserver = []
+ else:
+ self.dhcp_nameservers = dhcp_nameservers
+
+ if ipv6_nameservers is None:
+ self.ipv6_nameservers = []
+ else:
+ self.ipv6_nameservers = ipv6_nameservers
+
self.ipv6_enabled = False
self.clients = {}
- self.subnets = {}
- self.ifaces = {}
- self.v6nets = {}
+ #self.subnets = {}
+ #self.ifaces = {}
+ #self.v6nets = {}
self.nfq = {}
+ self.l2socket = socket.socket(socket.AF_PACKET,
+ socket.SOCK_RAW, ETH_P_ALL)
+ self.l2socket.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, 0)
# Inotify setup
self.wm = pyinotify.WatchManager()
mask = pyinotify.EventsCodes.ALL_FLAGS["IN_DELETE"]
mask |= pyinotify.EventsCodes.ALL_FLAGS["IN_CLOSE_WRITE"]
- handler = ClientFileHandler(self)
- self.notifier = pyinotify.Notifier(self.wm, handler)
+ inotify_handler = ClientFileHandler(self)
+ self.notifier = pyinotify.Notifier(self.wm, inotify_handler)
self.wm.add_watch(self.data_path, mask, rec=True)
# NFQUEUE setup
self._setup_nfqueue(ns_queue_num, AF_INET6, self.ns_response)
self.ipv6_enabled = True
+ def _cleanup(self):
+ """ Free all resources for a graceful exit
+
+ """
+ logging.info("Cleaning up")
+
+ logging.debug("Closing netfilter queues")
+ for q in self.nfq.values():
+ q.close()
+
+ logging.debug("Closing socket")
+ self.l2socket.close()
+
+ logging.debug("Stopping inotify watches")
+ self.notifier.stop()
+
+ logging.info("Cleanup finished")
+
def _setup_nfqueue(self, queue_num, family, callback):
- logging.debug("Setting up NFQUEUE for queue %d, AF %s" %
- (queue_num, family))
+ logging.debug("Setting up NFQUEUE for queue %d, AF %s",
+ queue_num, family)
q = nfqueue.queue()
q.set_callback(callback)
q.fast_open(queue_num, family)
q.set_mode(nfqueue.NFQNL_COPY_PACKET)
self.nfq[q.get_fd()] = q
+ def sendp(self, data, dev):
+ """ Send a raw packet using a layer-2 socket
+
+ """
+ logging.debug("%s", data)
+ if isinstance(data, BasePacket):
+ data = str(data)
+
+ self.l2socket.bind((dev, ETH_P_ALL))
+ count = self.l2socket.send(data)
+ ldata = len(data)
+ if count != ldata:
+ logging.warn("Truncated send on %s (%d/%d bytes sent)",
+ dev, count, ldata)
+
def build_config(self):
self.clients.clear()
- self.subnets.clear()
- for file in glob.glob(os.path.join(self.data_path, "*")):
- self.add_iface(file)
+ for path in glob.glob(os.path.join(self.data_path, "*")):
+ self.add_tap(path)
def get_ifindex(self, iface):
""" Get the interface index from sysfs
"""
- file = os.path.abspath(os.path.join(SYSFS_NET, iface, "ifindex"))
- if not file.startswith(SYSFS_NET):
+ path = os.path.abspath(os.path.join(SYSFS_NET, iface, "ifindex"))
+ if not path.startswith(SYSFS_NET):
return None
ifindex = None
try:
- f = open(file, 'r')
+ f = open(path, 'r')
except EnvironmentError:
- logging.debug("%s is probably down, removing" % iface)
- self.remove_iface(iface)
+ logging.debug("%s is probably down, removing", iface)
+ self.remove_tap(iface)
return ifindex
ifindex = int(ifindex)
except ValueError, e:
logging.warn("Failed to get ifindex for %s, cannot parse sysfs"
- " output '%s'" % (iface, ifindex))
+ " output '%s'", iface, ifindex)
except EnvironmentError, e:
- logging.warn("Error reading %s's ifindex from sysfs: %s" %
- (iface, str(e)))
- self.remove_iface(iface)
+ logging.warn("Error reading %s's ifindex from sysfs: %s",
+ iface, str(e))
+ self.remove_tap(iface)
finally:
f.close()
""" Get the interface hardware address from sysfs
"""
- file = os.path.abspath(os.path.join(SYSFS_NET, iface, "address"))
- if not file.startswith(SYSFS_NET):
+ path = os.path.abspath(os.path.join(SYSFS_NET, iface, "address"))
+ if not path.startswith(SYSFS_NET):
return None
addr = None
try:
- f = open(file, 'r')
+ f = open(path, 'r')
except EnvironmentError:
- logging.debug("%s is probably down, removing" % iface)
- self.remove_iface(iface)
+ logging.debug("%s is probably down, removing", iface)
+ self.remove_tap(iface)
return addr
try:
addr = f.readline().strip()
except EnvironmentError, e:
- logging.warn("Failed to read hw address for %s from sysfs: %s" %
- (iface, str(e)))
+ logging.warn("Failed to read hw address for %s from sysfs: %s",
+ iface, str(e))
finally:
f.close()
return addr
- def parse_routing_table(self, table="main", family=4):
- """ Parse the given routing table to get connected route, gateway and
- default device.
-
- """
- ipro = subprocess.Popen(["ip", "-%d" % family, "ro", "ls",
- "table", table], stdout=subprocess.PIPE)
- routes = ipro.stdout.readlines()
-
- def_gw = None
- def_dev = None
- def_net = None
-
- for route in routes:
- match = re.match(r'^default.*via ([^\s]+).*dev ([^\s]+)', route)
- if match:
- def_gw, def_dev = match.groups()
- break
-
- for route in routes:
- # Find the least-specific connected route
- m = re.match("^([^\\s]+) dev %s" % def_dev, route)
- if not m:
- continue
- def_net = m.groups(1)
-
- try:
- def_net = IPy.IP(def_net)
- except ValueError, e:
- logging.warn("Unable to parse default route entry %s: %s" %
- (def_net, str(e)))
-
- return Subnet(net=def_net, gw=def_gw, dev=def_dev)
-
- def parse_binding_file(self, path):
- """ Read a client configuration from a tap file
-
- """
- try:
- iffile = open(path, 'r')
- except EnvironmentError, e:
- logging.warn("Unable to open binding file %s: %s" % (path, str(e)))
- return (None, None, None, None)
-
- mac = None
- ips = None
- link = None
- hostname = None
-
- for line in iffile:
- if line.startswith("IP="):
- ip = line.strip().split("=")[1]
- ips = ip.split()
- elif line.startswith("MAC="):
- mac = line.strip().split("=")[1]
- elif line.startswith("LINK="):
- link = line.strip().split("=")[1]
- elif line.startswith("HOSTNAME="):
- hostname = line.strip().split("=")[1]
-
- return Client(mac=mac, ips=ips, link=link, hostname=hostname)
-
- def add_iface(self, path):
+ def add_tap(self, path):
""" Add an interface to monitor
"""
- iface = os.path.basename(path)
+ tap = os.path.basename(path)
- logging.debug("Updating configuration for %s" % iface)
- binding = self.parse_binding_file(path)
- ifindex = self.get_ifindex(iface)
+ logging.debug("Updating configuration for %s", tap)
+ b = parse_binding_file(path)
+ if b is None:
+ return
+ ifindex = self.get_ifindex(b.tap)
if ifindex is None:
- logging.warn("Stale configuration for %s found" % iface)
+ logging.warn("Stale configuration for %s found", tap)
else:
- if binding.is_valid():
- binding.iface = iface
- self.clients[binding.mac] = binding
- self.subnets[binding.link] = self.parse_routing_table(
- binding.link)
- logging.debug("Added client %s on %s" %
- (binding.hostname, iface))
- self.ifaces[ifindex] = iface
- self.v6nets[iface] = self.parse_routing_table(binding.link, 6)
-
- def remove_iface(self, iface):
+ if b.is_valid():
+ if self.mac_indexed_clients:
+ self.clients[b.mac] = b
+ else:
+ self.clients[ifindex] = b
+ logging.debug("Added client:")
+ logging.debug("%5s: %10s %20s %7s %15s",
+ ifindex, b.hostname, b.mac, b.tap, b.ip)
+ logging.debug("\n\n\n\n\n")
+ logging.debug("%10s %20s %7s %15s", 'Client', 'MAC', 'TAP', 'IP')
+ for b in self.clients.values():
+ logging.debug("%10s %20s %7s %15s", b.hostname, b.mac, b.tap, b.ip)
+
+ def remove_tap(self, tap):
""" Cleanup clients on a removed interface
"""
- if iface in self.v6nets:
- del self.v6nets[iface]
-
- for mac in self.clients.keys():
- if self.clients[mac].iface == iface:
- del self.clients[mac]
-
- for ifindex in self.ifaces.keys():
- if self.ifaces[ifindex] == iface:
- del self.ifaces[ifindex]
+ try:
+ for k in self.clients.keys():
+ if self.clients[k].tap = tap:
+ logging.debug("Removing client on interface %s", tap)
+ logging.debug("%10s %20s %7s %15s",
+ b.hostname, b.mac, b.tap, b.ip)
+ del self.clients[k]
+ except:
+ logging.debug("Client on %s disappeared!!!", tap)
- logging.debug("Removed interface %s" % iface)
- def dhcp_response(self, i, payload):
- """ Generate a reply to a BOOTP/DHCP request
+ def dhcp_response(self, i, payload): # pylint: disable=W0613,R0914
+ """ Generate a reply to bnetfilter-queue-deva BOOTP/DHCP request
"""
# Decode the response - NFQUEUE relays IP packets
pkt = IP(payload.get_data())
-
- # Get the actual interface from the ifindex
- iface = self.ifaces[payload.get_indev()]
-
- # Signal the kernel that it shouldn't further process the packet
- payload.set_verdict(nfqueue.NF_DROP)
+ logging.debug("IN DHCP RESPONCE")
+ #logging.debug(pkt.show())
# Get the client MAC address
resp = pkt.getlayer(BOOTP).copy()
resp.op = "BOOTREPLY"
del resp.payload
- try:
- binding = self.clients[mac]
- except KeyError:
- logging.warn("Invalid client %s on %s" % (mac, iface))
+ indev = get_indev(payload)
+
+ binding = get_binding(self, indev, mac)
+ if binding is None:
+ # We don't know anything about this interface, so accept the packet
+ # and return
+ logging.debug("Ignoring DHCP request on unknown iface %d", indev)
+ # We don't know what to do with this packet, so let the kernel
+ # handle it
+ payload.set_verdict(nfqueue.NF_ACCEPT)
return
- if iface != binding.iface:
- logging.warn("Received spoofed DHCP request for %s from interface"
- " %s instead of %s" %
- (mac, iface, binding.iface))
+
+ # Signal the kernel that it shouldn't further process the packet
+ payload.set_verdict(nfqueue.NF_DROP)
+
+ if mac != binding.mac:
+ logging.warn("Recieved spoofed DHCP request for mac %s from tap %s", mac, tap)
return
- resp = Ether(dst=mac, src=self.get_iface_hw_addr(iface))/\
+ resp = Ether(dst=mac, src=self.get_iface_hw_addr(binding.indev))/\
IP(src=DHCP_DUMMY_SERVER_IP, dst=binding.ip)/\
UDP(sport=pkt.dport, dport=pkt.sport)/resp
- subnet = self.subnets[binding.link]
+ subnet = binding.net
if not DHCP in pkt:
logging.warn("Invalid request from %s on %s, no DHCP"
- " payload found" % (binding.mac, iface))
+ " payload found", binding.mac, binding.tap)
return
dhcp_options = []
if type(opt) is tuple and opt[0] == "requested_addr":
requested_addr = opt[1]
- logging.info("%s from %s on %s" %
- (DHCP_TYPES.get(req_type, "UNKNOWN"), binding.mac, iface))
+ logging.info("%s from %s on %s", DHCP_TYPES.get(req_type, "UNKNOWN"),
+ binding.mac, binding.tap)
+
+ if self.dhcp_domain:
+ domainname = self.dhcp_domain
+ else:
+ domainname = binding.hostname.split('.', 1)[-1]
if req_type == DHCPREQUEST and requested_addr != binding.ip:
resp_type = DHCPNAK
logging.info("Sending DHCPNAK to %s on %s: requested %s"
- " instead of %s" %
- (binding.mac, iface, requested_addr, binding.ip))
+ " instead of %s", binding.mac, binding.tap,
+ requested_addr, binding.ip)
elif req_type in (DHCPDISCOVER, DHCPREQUEST):
resp_type = DHCP_REQRESP[req_type]
- resp.yiaddr = self.clients[mac].ip
+ resp.yiaddr = binding.ip
dhcp_options += [
("hostname", binding.hostname),
- ("domain", binding.hostname.split('.', 1)[-1]),
- ("router", subnet.gw),
+ ("domain", domainname),
("broadcast_address", str(subnet.broadcast)),
("subnet_mask", str(subnet.netmask)),
("renewal_time", self.lease_renewal),
("lease_time", self.lease_lifetime),
]
+ if subnet.gw:
+ dhcp_options += [("router", subnet.gw)]
dhcp_options += [("name_server", x) for x in self.dhcp_nameservers]
elif req_type == DHCPINFORM:
resp_type = DHCP_REQRESP[req_type]
dhcp_options += [
("hostname", binding.hostname),
- ("domain", binding.hostname.split('.', 1)[-1]),
+ ("domain", domainname),
]
dhcp_options += [("name_server", x) for x in self.dhcp_nameservers]
elif req_type == DHCPRELEASE:
# Log and ignore
- logging.info("DHCPRELEASE from %s on %s" %
- (binding.mac, iface))
+ logging.info("DHCPRELEASE from %s on %s", binding.mac, binding.tap )
return
# Finally, always add the server identifier and end options
]
resp /= DHCP(options=dhcp_options)
- logging.info("%s to %s (%s) on %s" %
- (DHCP_TYPES[resp_type], mac, binding.ip, iface))
- sendp(resp, iface=iface, verbose=False)
+ logging.info("%s to %s (%s) on %s", DHCP_TYPES[resp_type], mac,
+ binding.ip, binding.tap)
+ self.sendp(resp, binding.indev)
- def rs_response(self, i, payload):
+ def rs_response(self, i, payload): # pylint: disable=W0613
""" Generate a reply to a BOOTP/DHCP request
"""
- # Get the actual interface from the ifindex
- iface = self.ifaces[payload.get_indev()]
- ifmac = self.get_iface_hw_addr(iface)
- subnet = self.v6nets[iface]
- ifll = subnet.make_ll64(ifmac)
+ pkt = IPv6(payload.get_data())
+ logging.debug("IN RS RESPONCE")
+ #logging.debug(pkt.show())
+ mac = pkt.lladdr
+ logging.debug("rs for mac %s", mac)
+
+ indev = get_indev(payload)
+
+ binding = get_binding(self, indev, mac)
+ if binding is None:
+ # We don't know anything about this interface, so accept the packet
+ # and return
+ logging.debug("Ignoring router solicitation on for mac %s", mac)
+ # We don't know what to do with this packet, so let the kernel
+ # handle it
+ payload.set_verdict(nfqueue.NF_ACCEPT)
+ return
# Signal the kernel that it shouldn't further process the packet
payload.set_verdict(nfqueue.NF_DROP)
- resp = Ether(src=self.get_iface_hw_addr(iface))/\
+ if mac != binding.mac:
+ logging.warn("Recieved spoofed RS request for mac %s from tap %s", mac, tap)
+ return
+
+ subnet = binding.net6
+
+ if subnet.net is None:
+ logging.debug("No IPv6 network assigned for the interface")
+ return
+
+ indevmac = self.get_iface_hw_addr(binding.indev)
+ ifll = subnet.make_ll64(indevmac)
+
+
+ resp = Ether(src=indevmac)/\
IPv6(src=str(ifll))/ICMPv6ND_RA(routerlifetime=14400)/\
ICMPv6NDOptPrefixInfo(prefix=str(subnet.prefix),
prefixlen=subnet.prefixlen)
resp /= ICMPv6NDOptRDNSS(dns=self.ipv6_nameservers,
lifetime=self.ra_period * 3)
- logging.info("RA on %s for %s" % (iface, subnet.net))
- sendp(resp, iface=iface, verbose=False)
+ logging.info("RA on %s for %s", binding.indev, subnet.net)
+ self.sendp(resp, binding.indev)
- def ns_response(self, i, payload):
+ def ns_response(self, i, payload): # pylint: disable=W0613
""" Generate a reply to an ICMPv6 neighbor solicitation
"""
- # Get the actual interface from the ifindex
- iface = self.ifaces[payload.get_indev()]
- ifmac = self.get_iface_hw_addr(iface)
- subnet = self.v6nets[iface]
- ifll = subnet.make_ll64(ifmac)
-
ns = IPv6(payload.get_data())
+ logging.debug("IN NS RESPONCE")
+ logging.debug(ns.show())
+ mac = ns.lladdr
- if not (subnet.net.overlaps(ns.tgt) or str(ns.tgt) == str(ifll)):
- logging.debug("Received NS for a non-routable IP (%s)" % ns.tgt)
+ logging.debug("dst %s tgt %s" , ns.dst, ns.tgt)
+
+ indev = get_indev(payload)
+
+ binding = get_binding(self, indev, mac)
+ if binding is None:
+ # We don't know anything about this interface, so accept the packet
+ # and return
+ logging.debug("Ignoring neighbour solicitation for eui64 %s", ns.tgt)
+ # We don't know what to do with this packet, so let the kernel
+ # handle it
payload.set_verdict(nfqueue.NF_ACCEPT)
- return 1
+ return
payload.set_verdict(nfqueue.NF_DROP)
- try:
- client_lladdr = ns.lladdr
- except AttributeError:
+ if mac != binding.mac:
+ logging.warn("Recieved spoofed NS request for mac %s from tap %s", mac, tap)
+ return
+
+ subnet = binding.net6
+ if subnet.net is None:
+ logging.debug("No IPv6 network assigned for the interface")
+ return
+
+ indevmac = self.get_iface_hw_addr(binding.indev)
+
+ ifll = subnet.make_ll64(indevmac)
+
+ if not (subnet.net.overlaps(ns.tgt) or str(ns.tgt) == str(ifll)):
+ logging.debug("Received NS for a non-routable IP (%s)", ns.tgt)
+ payload.set_verdict(nfqueue.NF_ACCEPT)
return 1
- resp = Ether(src=ifmac, dst=client_lladdr)/\
+ logging.debug("na ether %s %s", binding.mac, ns.src)
+ resp = Ether(src=indevmac, dst=binding.mac)/\
IPv6(src=str(ifll), dst=ns.src)/\
ICMPv6ND_NA(R=1, O=0, S=1, tgt=ns.tgt)/\
- ICMPv6NDOptDstLLAddr(lladdr=ifmac)
+ ICMPv6NDOptDstLLAddr(lladdr=indevmac)
- logging.info("NA on %s for %s" % (iface, ns.tgt))
- sendp(resp, iface=iface, verbose=False)
- return 1
+ logging.info("NA on %s for %s", binding.indev, ns.tgt)
+ self.sendp(resp, binding.indev)
def send_periodic_ra(self):
# Use a separate thread as this may take a _long_ time with
logging.debug("Sending out periodic RAs")
start = time.time()
i = 0
- for client in self.clients.values():
- iface = client.iface
- ifmac = self.get_iface_hw_addr(iface)
- if not ifmac:
+ for binding in self.clients.values():
+ tap = binding.tap
+ indev = binding.indev
+ mac = binding.mac
+ subnet = binding.net6
+ if subnet.net is None:
+ logging.debug("Skipping periodic RA on interface %s,"
+ " as it is not IPv6-connected", tap)
continue
-
- subnet = self.v6nets[iface]
- ifll = subnet.make_ll64(ifmac)
- resp = Ether(src=ifmac)/\
+ indevmac = self.get_iface_hw_addr(indev)
+ ifll = subnet.make_ll64(indevmac)
+ resp = Ether(src=indevmac)/\
IPv6(src=str(ifll))/ICMPv6ND_RA(routerlifetime=14400)/\
ICMPv6NDOptPrefixInfo(prefix=str(subnet.prefix),
prefixlen=subnet.prefixlen)
resp /= ICMPv6NDOptRDNSS(dns=self.ipv6_nameservers,
lifetime=self.ra_period * 3)
try:
- sendp(resp, iface=iface, verbose=False)
+ self.sendp(resp, indev)
except socket.error, e:
- logging.warn("Periodic RA on %s failed: %s" % (iface, str(e)))
+ logging.warn("Periodic RA on %s failed: %s", tap, str(e))
except Exception, e:
- logging.warn("Unkown error during periodic RA on %s: %s" %
- (iface, str(e)))
+ logging.warn("Unkown error during periodic RA on %s: %s",
+ tap, str(e))
i += 1
- logging.debug("Sent %d RAs in %.2f seconds" % (i, time.time() - start))
+ logging.debug("Sent %d RAs in %.2f seconds", i, time.time() - start)
def serve(self):
+ """ Safely perform the main loop, freeing all resources upon exit
+
+ """
+ try:
+ self._serve()
+ finally:
+ self._cleanup()
+
+ def _serve(self):
""" Loop forever, serving DHCP requests
"""
self.build_config()
- iwfd = self.notifier._fd
+ # Yes, we are accessing _fd directly, but it's the only way to have a
+ # single select() loop ;-)
+ iwfd = self.notifier._fd # pylint: disable=W0212
start = time.time()
if self.ipv6_enabled:
while True:
rlist, _, xlist = select(self.nfq.keys() + [iwfd], [], [], timeout)
if xlist:
- logging.warn("Warning: Exception on %s" %
+ logging.warn("Warning: Exception on %s",
", ".join([ str(fd) for fd in xlist]))
if rlist:
for fd in rlist:
try:
self.nfq[fd].process_pending()
+ except RuntimeError, e:
+ logging.warn("Error processing fd %d: %s", fd, str(e))
except Exception, e:
- logging.warn("Error processing fd %d: %s" %
- (fd, str(e)))
+ logging.warn("Unknown error processing fd %d: %s",
+ fd, str(e))
if self.ipv6_enabled:
# Calculate the new timeout
if __name__ == "__main__":
+ import capng
import optparse
from cStringIO import StringIO
- from capng import *
from pwd import getpwnam, getpwuid
from configobj import ConfigObj, ConfigObjError, flatten_errors
try:
family = int(family)
except ValueError:
- raise vaildate.VdtParamError(family)
+ raise validate.VdtParamError(family)
if isinstance(value, (str, unicode)):
value = [value]
if not isinstance(value, list):
default=DEFAULT_CONFIG)
parser.add_option("-d", "--debug", action="store_true", dest="debug",
help="Turn on debugging messages")
- parser.add_option("-f", "--foreground", action="store_false", dest="daemonize",
- default=True, help="Do not daemonize, stay in the foreground")
+ parser.add_option("-f", "--foreground", action="store_false",
+ dest="daemonize", default=True,
+ help="Do not daemonize, stay in the foreground")
opts, args = parser.parse_args()
- if opts.daemonize:
- d = daemon.DaemonContext()
- d.umask = 0022
- d.open()
-
try:
config = ConfigObj(opts.config_file, configspec=config_spec)
- except ConfigObjError, e:
+ except ConfigObjError, err:
sys.stderr.write("Failed to parse config file %s: %s" %
- (opts.config_file, str(e)))
+ (opts.config_file, str(err)))
sys.exit(1)
results = config.validate(validator)
if results != True:
logging.fatal("Configuration file validation failed! See errors below:")
- for (section_list, key, _) in flatten_errors(config, results):
+ for (section_list, key, unused) in flatten_errors(config, results):
if key is not None:
- logging.fatal(" '%s' in section '%s' failed validation" % (key, ", ".join(section_list)))
+ logging.fatal(" '%s' in section '%s' failed validation",
+ key, ", ".join(section_list))
else:
- logging.fatal(" Section '%s' is missing" % ", ".join(section_list))
+ logging.fatal(" Section '%s' is missing",
+ ", ".join(section_list))
sys.exit(1)
- pidfile = open(config["general"]["pidfile"], "w")
- pidfile.write("%s" % os.getpid())
- pidfile.close()
-
logger = logging.getLogger()
if opts.debug:
logger.setLevel(logging.DEBUG)
else:
logger.setLevel(logging.INFO)
+ if opts.daemonize:
+ logfile = os.path.join(config["general"]["logdir"], LOG_FILENAME)
+ handler = logging.handlers.RotatingFileHandler(logfile,
+ maxBytes=2097152)
+ else:
+ handler = logging.StreamHandler()
+
+ handler.setFormatter(logging.Formatter(LOG_FORMAT))
+ logger.addHandler(handler)
+
+ if opts.daemonize:
+ pidfile = daemon.pidlockfile.TimeoutPIDLockFile(
+ config["general"]["pidfile"], 10)
+
+ d = daemon.DaemonContext(pidfile=pidfile,
+ stdout=handler.stream,
+ stderr=handler.stream,
+ files_preserve=[handler.stream])
+ d.umask = 0022
+ d.open()
+
logging.info("Starting up")
proxy_opts = {}
"dhcp_lease_renewal": config["dhcp"].as_int("lease_renewal"),
"dhcp_server_ip": config["dhcp"]["server_ip"],
"dhcp_nameservers": config["dhcp"]["nameservers"],
+ "dhcp_domain": config["dhcp"]["domain"],
})
if config["ipv6"].as_bool("enable_ipv6"):
"ipv6_nameservers": config["ipv6"]["nameservers"],
})
+ # pylint: disable=W0142
proxy = VMNetProxy(data_path=config["general"]["datapath"], **proxy_opts)
# Drop all capabilities except CAP_NET_RAW and change uid
uid = getpwnam(config["general"]["user"])
logging.debug("Setting capabilities and changing uid")
- logging.debug("User: %s, uid: %d, gid: %d" %
- (config["general"]["user"], uid.pw_uid, uid.pw_gid))
- capng_clear(CAPNG_SELECT_BOTH)
- capng_update(CAPNG_ADD, CAPNG_EFFECTIVE|CAPNG_PERMITTED, CAP_NET_RAW)
- capng_change_id(uid.pw_uid, uid.pw_gid,
- CAPNG_DROP_SUPP_GRP | CAPNG_CLEAR_BOUNDING)
-
- if opts.daemonize:
- logfile = os.path.join(config["general"]["logdir"], LOG_FILENAME)
- handler = logging.handlers.RotatingFileHandler(logfile,
- maxBytes=2097152)
- else:
- handler = logging.StreamHandler()
-
- handler.setFormatter(logging.Formatter(LOG_FORMAT))
- logger.addHandler(handler)
+ logging.debug("User: %s, uid: %d, gid: %d",
+ config["general"]["user"], uid.pw_uid, uid.pw_gid)
+
+ # Keep only the capabilities we need
+ # CAP_NET_ADMIN: we need to send nfqueue packet verdicts to a netlinkgroup
+ capng.capng_clear(capng.CAPNG_SELECT_BOTH)
+ capng.capng_update(capng.CAPNG_ADD,
+ capng.CAPNG_EFFECTIVE|capng.CAPNG_PERMITTED,
+ capng.CAP_NET_ADMIN)
+ capng.capng_change_id(uid.pw_uid, uid.pw_gid,
+ capng.CAPNG_DROP_SUPP_GRP|capng.CAPNG_CLEAR_BOUNDING)
logging.info("Ready to serve requests")
- proxy.serve()
+ try:
+ proxy.serve()
+ except Exception:
+ if opts.daemonize:
+ exc = "".join(traceback.format_exception(*sys.exc_info()))
+ logging.critical(exc)
+ raise
# vim: set ts=4 sts=4 sw=4 et :
projects / snf-nfdhcpd / blobdiff