#
import os
+import signal
+import errno
import re
import sys
import glob
import logging.handlers
import threading
import traceback
-import subprocess
import daemon
import daemon.runner
import daemon.pidlockfile
import nfqueue
import pyinotify
+import setproctitle
from lockfile import LockTimeout
import IPy
import socket
-from select import select
+import select
from socket import AF_INET, AF_INET6
from scapy.data import ETH_P_ALL
ICMPv6NDOptPrefixInfo, \
ICMPv6NDOptRDNSS
from scapy.layers.dhcp import BOOTP, DHCP
+from scapy.layers.dhcp6 import DHCP6_Reply, DHCP6OptDNSServers, \
+ DHCP6OptServerId, DHCP6OptClientId, \
+ DUID_LLT, DHCP6_InfoRequest, DHCP6OptDNSDomains
+
DEFAULT_CONFIG = "/etc/nfdhcpd/nfdhcpd.conf"
DEFAULT_PATH = "/var/run/ganeti-dhcpd"
SYSFS_NET = "/sys/class/net"
-LOG_FORMAT = "%(asctime)-15s %(levelname)-6s %(message)s"
+LOG_FORMAT = "%(asctime)-15s %(levelname)-8s %(message)s"
# Configuration file specification (see configobj documentation)
CONFIG_SPEC = """
ra_period = integer(min=1, max=4294967295)
rs_queue = integer(min=0, max=65535)
ns_queue = integer(min=0, max=65535)
+dhcp_queue = integer(min=0, max=65535)
nameservers = ip_addr_list(family=6)
+domains = force_list(default=None)
"""
try:
indev_ifindex = payload.get_physindev()
if indev_ifindex:
- logging.debug("Incomming packet from bridge %s", indev_ifindex)
+ logging.debug(" - Incoming packet from bridge with ifindex %s",
+ indev_ifindex)
return indev_ifindex
except AttributeError:
#TODO: return error value
- logging.debug("No get_physindev supported")
+ logging.debug("No get_physindev() supported")
return 0
indev_ifindex = payload.get_indev()
- logging.debug("Incomming packet from tap %s", indev_ifindex)
+ logging.debug(" - Incoming packet from tap with ifindex %s", indev_ifindex)
return indev_ifindex
-def get_binding(proxy, ifindex, mac):
- try:
- if proxy.mac_indexed_clients:
- logging.debug("Getting binding for mac %s", mac)
- b = proxy.clients[mac]
- else:
- logging.debug("Getting binding for ifindex %s", ifindex)
- 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))
+ logging.warn(" - Unable to open binding file %s: %s", path, str(e))
return None
tap = os.path.basename(path)
eui64 = get_value(line)
try:
- client = Client(tap=tap, mac=mac, ip=ip,
- hostname=hostname, indev=indev, subnet=subnet,
- gateway=gateway, subnet6=subnet6, gateway6=gateway6, eui64=eui64 )
- return client
- except:
+ return Client(tap=tap, mac=mac, ip=ip, hostname=hostname,
+ indev=indev, subnet=subnet, gateway=gateway,
+ subnet6=subnet6, gateway6=gateway6, eui64=eui64 )
+ except ValueError:
+ logging.warning(" - Cannot add client for host %s and IP %s on tap %s",
+ hostname, ip, tap)
return None
class Client(object):
- def __init__(self, tap=None, indev=None, mac=None, ip=None, hostname=None,
- subnet=None, gateway=None, subnet6=None, gateway6=None, eui64=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.ip = ip
self.hostname = hostname
self.gateway6 = gateway6
self.net6 = Subnet(net=subnet6, gw=gateway6, dev=tap)
self.eui64 = eui64
+ self.open_socket()
def is_valid(self):
- return self.mac is not None and self.ip is not None\
- and self.hostname is not None
+ return self.mac is not None and self.hostname is not None
+
+
+ def open_socket(self):
+
+ logging.info(" - Opening L2 socket and binding to %s", self.tap)
+ try:
+ s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, ETH_P_ALL)
+ s.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, 0)
+ s.bind((self.tap, ETH_P_ALL))
+ self.socket = s
+ except socket.error, e:
+ logging.warning(" - Cannot open socket %s", e)
+
+
+ def sendp(self, data):
+
+ if isinstance(data, BasePacket):
+ data = str(data)
+
+ logging.debug(" - Sending raw packet %r", data)
+
+ try:
+ count = self.socket.send(data, socket.MSG_DONTWAIT)
+ except socket.error, e:
+ logging.warn(" - Send with MSG_DONTWAIT failed: %s", str(e))
+ self.socket.close()
+ self.open_socket()
+ raise e
+
+ ldata = len(data)
+ logging.debug(" - Sent %d bytes on %s", count, self.tap)
+ if count != ldata:
+ logging.warn(" - Truncated msg: %d/%d bytes sent",
+ count, ldata)
class Subnet(object):
if isinstance(net, str):
try:
self.net = IPy.IP(net)
- except:
- raise Exception
+ except ValueError, e:
+ logging.warning(" - IPy error: %s", e)
+ raise e
else:
self.net = net
self.gw = gw
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,
+ rs_queue_num=None, ns_queue_num=None, dhcpv6_queue_num=None,
dhcp_lease_lifetime=DEFAULT_LEASE_LIFETIME,
dhcp_lease_renewal=DEFAULT_LEASE_RENEWAL,
- dhcp_domain='',
+ dhcp_domain=None,
dhcp_server_ip=DHCP_DUMMY_SERVER_IP, dhcp_nameservers=None,
- ra_period=DEFAULT_RA_PERIOD, ipv6_nameservers=None):
+ ra_period=DEFAULT_RA_PERIOD, ipv6_nameservers=None,
+ dhcpv6_domains=None):
try:
getattr(nfqueue.payload, 'get_physindev')
else:
self.ipv6_nameservers = ipv6_nameservers
+ if dhcpv6_domains is None:
+ self.dhcpv6_domains = []
+ else:
+ self.dhcpv6_domains = dhcpv6_domains
+
self.ipv6_enabled = False
self.clients = {}
#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()
# NFQUEUE setup
if dhcp_queue_num is not None:
- self._setup_nfqueue(dhcp_queue_num, AF_INET, self.dhcp_response)
+ self._setup_nfqueue(dhcp_queue_num, AF_INET, self.dhcp_response, 0)
if rs_queue_num is not None:
- self._setup_nfqueue(rs_queue_num, AF_INET6, self.rs_response)
+ self._setup_nfqueue(rs_queue_num, AF_INET6, self.rs_response, 10)
self.ipv6_enabled = True
if ns_queue_num is not None:
- self._setup_nfqueue(ns_queue_num, AF_INET6, self.ns_response)
+ self._setup_nfqueue(ns_queue_num, AF_INET6, self.ns_response, 10)
+ self.ipv6_enabled = True
+
+ if dhcpv6_queue_num is not None:
+ self._setup_nfqueue(dhcpv6_queue_num, AF_INET6, self.dhcpv6_response, 10)
self.ipv6_enabled = True
+ def get_binding(self, ifindex, mac):
+ try:
+ if self.mac_indexed_clients:
+ logging.debug(" - Getting binding for mac %s", mac)
+ b = self.clients[mac]
+ else:
+ logging.debug(" - Getting binding for ifindex %s", ifindex)
+ b = self.clients[ifindex]
+ return b
+ except KeyError:
+ logging.debug(" - No client found for mac / ifindex %s / %s",
+ mac, ifindex)
+ return None
+
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():
+ 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")
+ logging.debug(" - Stopping inotify watches")
self.notifier.stop()
- logging.info("Cleanup finished")
+ logging.info(" - Cleanup finished")
- def _setup_nfqueue(self, queue_num, family, callback):
+ def _setup_nfqueue(self, queue_num, family, callback, pending):
logging.info("Setting up NFQUEUE for queue %d, AF %s",
queue_num, family)
q = nfqueue.queue()
q.set_queue_maxlen(5000)
# This is mandatory for the queue to operate
q.set_mode(nfqueue.NFQNL_COPY_PACKET)
- self.nfq[q.get_fd()] = q
- logging.debug("Successfully set up NFQUEUE %d", queue_num)
-
- def sendp(self, data, dev):
- """ Send a raw packet using a layer-2 socket
-
- """
- logging.debug("Sending raw packet %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)
+ self.nfq[q.get_fd()] = (q, pending)
+ logging.debug(" - Successfully set up NFQUEUE %d", queue_num)
def build_config(self):
self.clients.clear()
for path in glob.glob(os.path.join(self.data_path, "*")):
self.add_tap(path)
- logging.debug("%15s %20s %7s %15s", 'Client', 'MAC', 'TAP', 'IP')
- for b in self.clients.values():
- logging.debug("%15s %20s %7s %15s", b.hostname, b.mac, b.tap, b.ip)
+ self.print_clients()
def get_ifindex(self, iface):
""" Get the interface index from sysfs
"""
- logging.debug("Getting ifindex for interface %s from sysfs", iface)
+ logging.debug(" - Getting ifindex for interface %s from sysfs", iface)
path = os.path.abspath(os.path.join(SYSFS_NET, iface, "ifindex"))
if not path.startswith(SYSFS_NET):
try:
f = open(path, 'r')
except EnvironmentError:
- logging.debug("%s is probably down, removing", iface)
+ logging.debug(" - %s is probably down, removing", iface)
self.remove_tap(iface)
return ifindex
try:
ifindex = int(ifindex)
except ValueError, e:
- logging.warn("Failed to get ifindex for %s, cannot parse sysfs"
- " output '%s'", iface, ifindex)
+ logging.warn(" - Failed to get ifindex for %s, cannot parse"
+ " sysfs output '%s'", iface, ifindex)
except EnvironmentError, e:
- logging.warn("Error reading %s's ifindex from sysfs: %s",
+ logging.warn(" - Error reading %s's ifindex from sysfs: %s",
iface, str(e))
self.remove_tap(iface)
finally:
""" Get the interface hardware address from sysfs
"""
- logging.debug("Getting mac for iface %s", iface)
+ logging.debug(" - Getting mac for iface %s", iface)
path = os.path.abspath(os.path.join(SYSFS_NET, iface, "address"))
if not path.startswith(SYSFS_NET):
return None
try:
f = open(path, 'r')
except EnvironmentError:
- logging.debug("%s is probably down, removing", 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",
+ logging.warn(" - Failed to read hw address for %s from sysfs: %s",
iface, str(e))
finally:
f.close()
"""
tap = os.path.basename(path)
- logging.debug("Updating configuration for %s", tap)
+ logging.info("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", tap)
+ logging.warn(" - Stale configuration for %s found", tap)
else:
if b.is_valid():
if self.mac_indexed_clients:
self.clients[b.mac] = b
+ k = b.mac
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)
+ k = ifindex
+ logging.info(" - Added client:")
+ logging.info(" + %10s | %20s %20s %10s %20s %40s",
+ k, b.hostname, b.mac, b.tap, b.ip, b.eui64)
def remove_tap(self, tap):
""" Cleanup clients on a removed interface
"""
try:
- for k in self.clients.keys():
- b = self.clients[k]
- 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)
+ for k, cl in self.clients.items():
+ if cl.tap == tap:
+ logging.info("Removing client %s and closing socket on %s",
+ cl.hostname, cl.tap)
+ logging.info(" - %10s | %20s %20s %10s %20s %40s",
+ k, cl.hostname, cl.mac, cl.tap, cl.ip, cl.eui64)
+ cl.socket.close()
del self.clients[k]
except:
logging.debug("Client on %s disappeared!!!", tap)
- def dhcp_response(self, i, payload): # pylint: disable=W0613,R0914
+
+ def dhcp_response(self, arg1, arg2=None): # pylint: disable=W0613,R0914
""" Generate a reply to bnetfilter-queue-deva BOOTP/DHCP request
"""
+ logging.info(" * Processing pending DHCP request")
+ # Workaround for supporting both squeezy's nfqueue-bindings-python
+ # and wheezy's python-nfqueue because for some reason the function's
+ # signature has changed and has broken compatibility
+ # See bug http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718894
+ if arg2:
+ payload = arg2
+ else:
+ payload = arg1
# Decode the response - NFQUEUE relays IP packets
pkt = IP(payload.get_data())
- logging.debug("Generating DHCP response")
#logging.debug(pkt.show())
# Get the client MAC address
indev = get_indev(payload)
- binding = get_binding(self, indev, mac)
+ binding = self.get_binding(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)
+ logging.debug(" - Ignoring DHCP request on unknown iface %s", indev)
# We don't know what to do with this packet, so let the kernel
# handle it
payload.set_verdict(nfqueue.NF_ACCEPT)
payload.set_verdict(nfqueue.NF_DROP)
if mac != binding.mac:
- logging.warn("Recieved spoofed DHCP request for mac %s from tap %s", mac, indev)
+ logging.warn(" - Recieved spoofed DHCP request: mac %s, indev %s",
+ mac, indev)
+ return
+
+ if not binding.ip:
+ logging.info(" - No IP found in binding file.")
return
+ logging.info(" - Generating DHCP response:"
+ " host %s, mac %s, tap %s, indev %s",
+ binding.hostname, mac, binding.tap, indev)
+
+
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 = binding.net
if not DHCP in pkt:
- logging.warn("Invalid request from %s on %s, no DHCP"
+ logging.warn(" - Invalid request from %s on %s, no DHCP"
" payload found", binding.mac, binding.tap)
return
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"),
+ logging.info(" - %s from %s on %s", DHCP_TYPES.get(req_type, "UNKNOWN"),
binding.mac, binding.tap)
if self.dhcp_domain:
if req_type == DHCPREQUEST and requested_addr != binding.ip:
resp_type = DHCPNAK
- logging.info("Sending DHCPNAK to %s on %s: requested %s"
+ logging.info(" - Sending DHCPNAK to %s on %s: requested %s"
" instead of %s", binding.mac, binding.tap,
requested_addr, binding.ip)
elif req_type == DHCPRELEASE:
# Log and ignore
- logging.info("DHCPRELEASE from %s on %s", binding.mac, binding.tap)
+ logging.info(" - DHCPRELEASE from %s on %s",
+ binding.hostname, 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,
+ logging.info(" - %s to %s (%s) on %s", DHCP_TYPES[resp_type], mac,
binding.ip, binding.tap)
try:
- self.sendp(resp, binding.indev)
+ binding.sendp(resp)
+ except socket.error, e:
+ logging.warn(" - DHCP response on %s (%s) failed: %s",
+ binding.tap, binding.hostname, str(e))
+ except Exception, e:
+ logging.warn(" - Unkown error during DHCP response on %s (%s): %s",
+ binding.tap, binding.hostname, str(e))
+
+ def dhcpv6_response(self, arg1, arg2=None): # pylint: disable=W0613
+
+ logging.info(" * Processing pending DHCPv6 request")
+ # Workaround for supporting both squeezy's nfqueue-bindings-python
+ # and wheezy's python-nfqueue because for some reason the function's
+ # signature has changed and has broken compatibility
+ # See bug http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718894
+ if arg2:
+ payload = arg2
+ else:
+ payload = arg1
+ pkt = IPv6(payload.get_data())
+ indev = get_indev(payload)
+
+ #TODO: figure out how to find the src mac
+ mac = None
+ binding = self.get_binding(indev, mac)
+ if binding is None:
+ # We don't know anything about this interface, so accept the packet
+ # and return
+ logging.debug(" - Ignoring dhcpv6 request 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)
+
+ subnet = binding.net6
+
+ if subnet.net is None:
+ logging.debug(" - No IPv6 network assigned for tap %s", binding.tap)
+ return
+
+ indevmac = self.get_iface_hw_addr(binding.indev)
+ ifll = subnet.make_ll64(indevmac)
+ if ifll is None:
+ return
+
+ ofll = subnet.make_ll64(binding.mac)
+ if ofll is None:
+ return
+
+ logging.info(" - Generating DHCPv6 response for host %s (mac %s) on tap %s",
+ binding.hostname, binding.mac, binding.tap)
+
+ if self.dhcpv6_domains:
+ domains = self.dhcpv6_domains
+ else:
+ domains = [binding.hostname.split('.', 1)[-1]]
+
+ # We do this in order not to caclulate optlen ourselves
+ dnsdomains = str(DHCP6OptDNSDomains(dnsdomains=domains))
+ dnsservers = str(DHCP6OptDNSServers(dnsservers=self.ipv6_nameservers))
+
+ resp = Ether(src=indevmac, dst=binding.mac)/\
+ IPv6(tc=192, src=str(ifll), dst=str(ofll))/\
+ UDP(sport=pkt.dport, dport=pkt.sport)/\
+ DHCP6_Reply(trid=pkt[DHCP6_InfoRequest].trid)/\
+ DHCP6OptClientId(duid=pkt[DHCP6OptClientId].duid)/\
+ DHCP6OptServerId(duid=DUID_LLT(lladdr=indevmac, timeval=time.time()))/\
+ DHCP6OptDNSDomains(dnsdomains)/\
+ DHCP6OptDNSServers(dnsservers)
+
+ try:
+ binding.sendp(resp)
except socket.error, e:
- logging.warn("DHCP response on %s failed: %s", binding.indev, str(e))
+ logging.warn(" - DHCPv6 on %s (%s) failed: %s",
+ binding.tap, binding.hostname, str(e))
except Exception, e:
- logging.warn("Unkown error during DHCP response on %s: %s",
- binding.indev, str(e))
+ logging.warn(" - Unkown error during DHCPv6 on %s (%s): %s",
+ binding.tap, binding.hostname, str(e))
+
- def rs_response(self, i, payload): # pylint: disable=W0613
+ def rs_response(self, arg1, arg2=None): # pylint: disable=W0613
""" Generate a reply to a BOOTP/DHCP request
"""
-
+ logging.info(" * Processing pending RS request")
+ # Workaround for supporting both squeezy's nfqueue-bindings-python
+ # and wheezy's python-nfqueue because for some reason the function's
+ # signature has changed and has broken compatibility
+ # See bug http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718894
+ if arg2:
+ payload = arg2
+ else:
+ payload = arg1
pkt = IPv6(payload.get_data())
#logging.debug(pkt.show())
try:
mac = pkt.lladdr
except:
- logging.debug("Cannot obtain lladdr in rs")
+ logging.debug(" - Cannot obtain lladdr in rs")
return
- logging.debug("Generating an rs response for mac %s", mac)
-
indev = get_indev(payload)
- binding = get_binding(self, indev, mac)
+ binding = self.get_binding(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)
+ 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)
payload.set_verdict(nfqueue.NF_DROP)
if mac != binding.mac:
- logging.warn("Received spoofed RS request for mac %s from tap %s",
+ logging.warn(" - Received spoofed RS request: mac %s, tap %s",
mac, binding.tap)
return
subnet = binding.net6
if subnet.net is None:
- logging.debug("No IPv6 network assigned for the interface")
+ logging.debug(" - No IPv6 network assigned for tap %s", binding.tap)
return
indevmac = self.get_iface_hw_addr(binding.indev)
if ifll is None:
return
+ logging.info(" - Generating RA for host %s (mac %s) on tap %s",
+ binding.hostname, mac, binding.tap)
+
resp = Ether(src=indevmac)/\
- IPv6(src=str(ifll))/ICMPv6ND_RA(routerlifetime=14400)/\
+ IPv6(src=str(ifll))/ICMPv6ND_RA(O=1, 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", binding.indev, subnet.net)
try:
- self.sendp(resp, binding.indev)
+ binding.sendp(resp)
except socket.error, e:
- logging.warn("RA on %s failed: %s", binding.indev, str(e))
+ logging.warn(" - RA on %s (%s) failed: %s",
+ binding.tap, binding.hostname, str(e))
except Exception, e:
- logging.warn("Unkown error during RA on %s: %s",
- binding.indev, str(e))
+ logging.warn(" - Unkown error during RA on %s (%s): %s",
+ binding.tap, binding.hostname, str(e))
- def ns_response(self, i, payload): # pylint: disable=W0613
+ def ns_response(self, arg1, arg2=None): # pylint: disable=W0613
""" Generate a reply to an ICMPv6 neighbor solicitation
"""
+ logging.info(" * Processing pending NS request")
+ # Workaround for supporting both squeezy's nfqueue-bindings-python
+ # and wheezy's python-nfqueue because for some reason the function's
+ # signature has changed and has broken compatibility
+ # See bug http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718894
+ if arg2:
+ payload = arg2
+ else:
+ payload = arg1
+
ns = IPv6(payload.get_data())
#logging.debug(ns.show())
try:
mac = ns.lladdr
except:
- logging.debug("Cannot obtain lladdr from ns")
+ logging.debug(" - Cannot obtain lladdr from ns")
return
- logging.debug("Generating ns response, dst: %s tgt: %s", ns.dst, ns.tgt)
indev = get_indev(payload)
- binding = get_binding(self, indev, mac)
+ binding = self.get_binding(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)
+ 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)
payload.set_verdict(nfqueue.NF_DROP)
if mac != binding.mac:
- logging.warn("Received spoofed NS request for mac %s from tap %s",
- mac, binding.tap)
+ logging.warn(" - Received spoofed NS request"
+ " for mac %s from tap %s", mac, binding.tap)
return
subnet = binding.net6
if subnet.net is None:
- logging.debug("No IPv6 network assigned for the interface")
+ logging.debug(" - No IPv6 network assigned for the interface")
return
indevmac = self.get_iface_hw_addr(binding.indev)
return
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)
+ logging.debug(" - Received NS for a non-routable IP (%s)", ns.tgt)
return 1
- logging.debug("Sending NA response to client %s", binding.mac)
+ logging.info(" - Generating NA for host %s (mac %s) on tap %s",
+ binding.hostname, mac, binding.tap)
+
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=indevmac)
- logging.info("NA on %s for %s", binding.indev, ns.tgt)
try:
- self.sendp(resp, binding.indev)
+ binding.sendp(resp)
except socket.error, e:
- logging.warn("NA on %s failed: %s", binding.indev, str(e))
+ logging.warn(" - NA on %s (%s) failed: %s",
+ binding.tap, binding.hostname, str(e))
except Exception, e:
- logging.warn("Unkown error during periodic NA on %s: %s",
- binding.indev, str(e))
+ logging.warn(" - Unkown error during periodic NA to %s (%s): %s",
+ binding.tap, binding.hostname, str(e))
def send_periodic_ra(self):
# Use a separate thread as this may take a _long_ time with
threading.Thread(target=self._send_periodic_ra).start()
def _send_periodic_ra(self):
- logging.debug("Sending out periodic RAs")
+ logging.info("Sending out periodic RAs")
start = time.time()
i = 0
for binding in self.clients.values():
# mac = binding.mac
subnet = binding.net6
if subnet.net is None:
- logging.debug("Skipping periodic RA on interface %s,"
+ logging.debug(" - Skipping periodic RA on interface %s,"
" as it is not IPv6-connected", tap)
continue
indevmac = self.get_iface_hw_addr(indev)
if ifll is None:
continue
resp = Ether(src=indevmac)/\
- IPv6(src=str(ifll))/ICMPv6ND_RA(routerlifetime=14400)/\
+ IPv6(src=str(ifll))/ICMPv6ND_RA(O=1, routerlifetime=14400)/\
ICMPv6NDOptPrefixInfo(prefix=str(subnet.prefix),
prefixlen=subnet.prefixlen)
if self.ipv6_nameservers:
resp /= ICMPv6NDOptRDNSS(dns=self.ipv6_nameservers,
lifetime=self.ra_period * 3)
try:
- self.sendp(resp, indev)
+ binding.sendp(resp)
except socket.error, e:
- logging.warn("Periodic RA on %s failed: %s", tap, str(e))
+ logging.warn(" - Periodic RA on %s (%s) failed: %s",
+ tap, binding.hostname, str(e))
except Exception, e:
- logging.warn("Unkown error during periodic RA on %s: %s",
- tap, str(e))
+ logging.warn(" - Unkown error during periodic RA on %s (%s):"
+ " %s", tap, binding.hostname, str(e))
i += 1
- logging.debug("Sent %d RAs in %.2f seconds", i, time.time() - start)
+ logging.info(" - Sent %d RAs in %.2f seconds", i, time.time() - start)
def serve(self):
""" Safely perform the main loop, freeing all resources upon exit
timeout = None
while True:
- rlist, _, xlist = select(self.nfq.keys() + [iwfd], [], [], timeout)
+ try:
+ rlist, _, xlist = select.select(self.nfq.keys() + [iwfd],
+ [], [], timeout)
+ except select.error, e:
+ if e[0] == errno.EINTR:
+ logging.debug("select() got interrupted")
+ continue
+
if xlist:
logging.warn("Warning: Exception on %s",
", ".join([str(fd) for fd in xlist]))
self.notifier.process_events()
rlist.remove(iwfd)
+ logging.debug("Pending requests on fds %s", rlist)
+
for fd in rlist:
try:
- self.nfq[fd].process_pending()
+ q, num = self.nfq[fd]
+ cnt = q.process_pending(num)
+ logging.debug(" * Processed %d requests on NFQUEUE"
+ " with fd %d", cnt, fd)
except RuntimeError, e:
logging.warn("Error processing fd %d: %s", fd, str(e))
except Exception, e:
self.send_periodic_ra()
timeout = self.ra_period - (time.time() - start)
+ def print_clients(self):
+ logging.info("%10s %20s %20s %10s %20s %40s",
+ 'Key', 'Client', 'MAC', 'TAP', 'IP', 'IPv6')
+ for k, cl in self.clients.items():
+ logging.info("%10s | %20s %20s %10s %20s %40s",
+ k, cl.hostname, cl.mac, cl.tap, cl.ip, cl.eui64)
+
+
if __name__ == "__main__":
import capng
", ".join(section_list))
sys.exit(1)
+ try:
+ uid = getpwuid(config["general"].as_int("user"))
+ except ValueError:
+ uid = getpwnam(config["general"]["user"])
+
+ # Keep only the capabilities we need
+ # CAP_NET_ADMIN: we need to send nfqueue packet verdicts to a netlinkgroup
+ # CAP_NET_RAW: we need to reopen socket in case the buffer gets full
+ # CAP_SETPCAP: needed by capng_change_id()
+ 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_update(capng.CAPNG_ADD,
+ capng.CAPNG_EFFECTIVE | capng.CAPNG_PERMITTED,
+ capng.CAP_NET_RAW)
+ capng.capng_update(capng.CAPNG_ADD,
+ capng.CAPNG_EFFECTIVE | capng.CAPNG_PERMITTED,
+ capng.CAP_SETPCAP)
+ # change uid
+ capng.capng_change_id(uid.pw_uid, uid.pw_gid,
+ capng.CAPNG_DROP_SUPP_GRP | \
+ capng.CAPNG_CLEAR_BOUNDING)
+
logger = logging.getLogger()
if opts.debug:
logger.setLevel(logging.DEBUG)
if opts.daemonize:
logfile = os.path.join(config["general"]["logdir"], LOG_FILENAME)
- handler = logging.handlers.RotatingFileHandler(logfile,
- maxBytes=2097152)
+ handler = logging.handlers.WatchedFileHandler(logfile)
else:
handler = logging.StreamHandler()
handler.setFormatter(logging.Formatter(LOG_FORMAT))
logger.addHandler(handler)
+ # Rename this process so 'ps' output looks like
+ # this is a native executable.
+ # NOTE: due to a bug in python-setproctitle, one cannot yet
+ # set individual values for command-line arguments, so only show
+ # the name of the executable instead.
+ # setproctitle.setproctitle("\x00".join(sys.argv))
+ setproctitle.setproctitle(sys.argv[0])
+
if opts.daemonize:
pidfile = daemon.pidlockfile.TimeoutPIDLockFile(
config["general"]["pidfile"], 10)
sys.exit(1)
logging.info("Starting up")
+ logging.info("Running as %s (uid:%d, gid: %d)",
+ config["general"]["user"], uid.pw_uid, uid.pw_gid)
proxy_opts = {}
if config["dhcp"].as_bool("enable_dhcp"):
if config["ipv6"].as_bool("enable_ipv6"):
proxy_opts.update({
+ "dhcpv6_queue_num": config["ipv6"].as_int("dhcp_queue"),
"rs_queue_num": config["ipv6"].as_int("rs_queue"),
"ns_queue_num": config["ipv6"].as_int("ns_queue"),
"ra_period": config["ipv6"].as_int("ra_period"),
"ipv6_nameservers": config["ipv6"]["nameservers"],
+ "dhcpv6_domains": config["ipv6"]["domains"],
})
# pylint: disable=W0142
proxy = VMNetProxy(data_path=config["general"]["datapath"], **proxy_opts)
- # Drop all capabilities except CAP_NET_RAW and change uid
- try:
- uid = getpwuid(config["general"].as_int("user"))
- except ValueError:
- uid = getpwnam(config["general"]["user"])
+ logging.info("Ready to serve requests")
- logging.debug("Setting capabilities and changing uid")
- 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)
+ def debug_handler(signum, _):
+ logging.debug('Received signal %d. Printing proxy state...', signum)
+ proxy.print_clients()
+
+ # Set the signal handler for debuging clients
+ signal.signal(signal.SIGUSR1, debug_handler)
+ signal.siginterrupt(signal.SIGUSR1, False)
- logging.info("Ready to serve requests")
try:
proxy.serve()
except Exception:
projects / snf-nfdhcpd / blobdiff