--- /dev/null
+#!/usr/bin/python
+import sys
+sys.path.append('pydhcplib/')
+import pydhcplib
+import pydhcplib.dhcp_network
+from pydhcplib.dhcp_packet import *
+from pydhcplib.type_hw_addr import hwmac
+from pydhcplib.type_ipv4 import ipv4
+from pydhcplib.type_strlist import strlist
+import socket
+import IN
+
+import event_logger
+if '__main__' == __name__:
+ event_logger.init("stdout", 'DEBUG', {})
+from event_logger import Log
+
+import psycopg2
+import time
+import sipb_xen_database
+from sqlalchemy import create_engine
+
+dhcp_options = {'subnet_mask': '255.255.0.0',
+ 'router': '18.181.0.1',
+ 'domain_name_server': '18.70.0.160,18.71.0.151,18.72.0.3',
+ 'domain_name': 'mit.edu',
+ 'ip_address_lease_time': 60*60*24}
+
+class DhcpBackend:
+ def __init__(self, database=None):
+ if database is not None:
+ self.database = database
+ sipb_xen_database.connect(create_engine(database))
+ def findNIC(self, mac):
+ for i in range(3):
+ try:
+ value = sipb_xen_database.NIC.get_by(mac_addr=mac)
+ except psycopg2.OperationalError:
+ time.sleep(0.5)
+ if i == 2: #Try twice to reconnect.
+ raise
+ #Sigh. SQLAlchemy should do this itself.
+ sipb_xen_database.connect(create_engine(self.database))
+ else:
+ break
+ return value
+ def find_interface(self, packet):
+ chaddr = hwmac(packet.GetHardwareAddress())
+ nic = self.findNIC(str(chaddr))
+ if nic is None or nic.ip is None:
+ return ("18.181.0.60", None)
+ ipstr = ''.join(reversed(['%02X' % i for i in ipv4(nic.ip).list()]))
+ for line in open('/proc/net/route'):
+ parts = line.split()
+ if parts[1] == ipstr:
+ Log.Output(Log.debug, "find_interface found "+str(nic.ip)+" on "+parts[0])
+ return ("18.181.0.60", parts[0])
+ return ("18.181.0.60", None)
+
+ def getParameters(self, **extra):
+ all_options=dict(dhcp_options)
+ all_options.update(extra)
+ options = {}
+ for parameter, value in all_options.iteritems():
+ if value is None:
+ continue
+ option_type = DhcpOptionsTypes[DhcpOptions[parameter]]
+
+ if option_type == "ipv4" :
+ # this is a single ip address
+ options[parameter] = map(int,value.split("."))
+ elif option_type == "ipv4+" :
+ # this is multiple ip address
+ iplist = value.split(",")
+ opt = []
+ for single in iplist :
+ opt.extend(ipv4(single).list())
+ options[parameter] = opt
+ elif option_type == "32-bits" :
+ # This is probably a number...
+ digit = int(value)
+ options[parameter] = [digit>>24&0xFF,(digit>>16)&0xFF,(digit>>8)&0xFF,digit&0xFF]
+ elif option_type == "16-bits" :
+ digit = int(value)
+ options[parameter] = [(digit>>8)&0xFF,digit&0xFF]
+
+ elif option_type == "char" :
+ digit = int(value)
+ options[parameter] = [digit&0xFF]
+
+ elif option_type == "bool" :
+ if value=="False" or value=="false" or value==0 :
+ options[parameter] = [0]
+ else : options[parameter] = [1]
+
+ elif option_type == "string" :
+ options[parameter] = strlist(value).list()
+
+ else :
+ options[parameter] = strlist(value).list()
+ return options
+
+ def Discover(self, packet):
+ Log.Output(Log.debug,"dhcp_backend : Discover ")
+ chaddr = hwmac(packet.GetHardwareAddress())
+ nic = self.findNIC(str(chaddr))
+ if nic is None or nic.machine is None:
+ return False
+ ip = nic.ip
+ if ip is None: #Deactivated?
+ return False
+ if nic.hostname and '.' in nic.hostname:
+ hostname = nic.hostname
+ elif nic.machine.name:
+ hostname = nic.machine.name + '.servers.csail.mit.edu'
+ else:
+ hostname = None
+ if ip is not None:
+ ip = ipv4(ip)
+ Log.Output(Log.debug,"dhcp_backend : Discover result = "+str(ip))
+ packet_parameters = self.getParameters(host_name=hostname)
+
+ # FIXME: Other offer parameters go here
+ packet_parameters["yiaddr"] = ip.list()
+
+ packet.SetMultipleOptions(packet_parameters)
+ return True
+ return False
+
+ def Request(self, packet):
+ Log.Output(Log.debug, "dhcp_backend : Request")
+
+ discover = self.Discover(packet)
+
+ chaddr = hwmac(packet.GetHardwareAddress())
+ request = packet.GetOption("request_ip_address")
+ if not request:
+ request = packet.GetOption("ciaddr")
+ yiaddr = packet.GetOption("yiaddr")
+
+ if not discover:
+ Log.Output(Log.info,"Unknown MAC address: "+str(chaddr))
+ return False
+
+ if yiaddr!="0.0.0.0" and yiaddr == request :
+ Log.Output(Log.info,"Ack ip "+str(yiaddr)+" for "+str(chaddr))
+ return True
+ else:
+ Log.Output(Log.info,"Requested ip "+str(request)+" not available for "+str(chaddr))
+ return False
+
+ def Decline(self, packet):
+ pass
+ def Release(self, packet):
+ pass
+
+
+class DhcpServer(pydhcplib.dhcp_network.DhcpServer):
+ def __init__(self, backend, options = {'client_listenport':68,'server_listenport':67}):
+ pydhcplib.dhcp_network.DhcpServer.__init__(self,"0.0.0.0",options["client_listen_port"],options["server_listen_port"],)
+ self.backend = backend
+ Log.Output(Log.debug, "__init__ DhcpServer")
+
+ def SendDhcpPacketTo(self, To, packet):
+ (ip, intf) = self.backend.find_interface(packet)
+ if intf:
+ out_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+ out_socket.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST,1)
+ out_socket.setsockopt(socket.SOL_SOCKET, IN.SO_BINDTODEVICE, intf)
+ #out_socket.bind((ip, self.listen_port))
+ ret = out_socket.sendto(packet.EncodePacket(), (To,self.emit_port))
+ out_socket.close()
+ return ret
+ else:
+ return self.dhcp_socket.sendto(packet.EncodePacket(),(To,self.emit_port))
+
+ def SendPacket(self, packet):
+ """Encode and send the packet."""
+
+ giaddr = packet.GetOption('giaddr')
+
+ # in all case, if giaddr is set, send packet to relay_agent
+ # network address defines by giaddr
+ if giaddr!=[0,0,0,0] :
+ agent_ip = ".".join(map(str,giaddr))
+ self.SendDhcpPacketTo(agent_ip,packet)
+ Log.Output(Log.debug, "SendPacket to agent : "+agent_ip)
+
+ # FIXME: This shouldn't broadcast if it has an IP address to send
+ # it to instead. See RFC2131 part 4.1 for full details
+ else :
+ Log.Output(Log.debug, "No agent, broadcast packet.")
+ self.SendDhcpPacketTo("255.255.255.255",packet)
+
+
+ def HandleDhcpDiscover(self, packet):
+ """Build and send DHCPOFFER packet in response to DHCPDISCOVER
+ packet."""
+
+ logmsg = "Get DHCPDISCOVER packet from " + hwmac(packet.GetHardwareAddress()).str()
+
+ Log.Output(Log.info, logmsg)
+ offer = DhcpPacket()
+ offer.CreateDhcpOfferPacketFrom(packet)
+
+ if self.backend.Discover(offer):
+ self.SendPacket(offer)
+ # FIXME : what if false ?
+
+
+ def HandleDhcpRequest(self, packet):
+ """Build and send DHCPACK or DHCPNACK packet in response to
+ DHCPREQUEST packet. 4 types of DHCPREQUEST exists."""
+
+ ip = packet.GetOption("request_ip_address")
+ sid = packet.GetOption("server_identifier")
+ ciaddr = packet.GetOption("ciaddr")
+ #packet.PrintHeaders()
+ #packet.PrintOptions()
+
+ if sid != [0,0,0,0] and ciaddr == [0,0,0,0] :
+ Log.Output(Log.info, "Get DHCPREQUEST_SELECTING_STATE packet")
+
+ elif sid == [0,0,0,0] and ciaddr == [0,0,0,0] and ip :
+ Log.Output(Log.info, "Get DHCPREQUEST_INITREBOOT_STATE packet")
+
+ elif sid == [0,0,0,0] and ciaddr != [0,0,0,0] and not ip :
+ Log.Output(Log.info,"Get DHCPREQUEST_INITREBOOT_STATE packet")
+
+ else : Log.Output(Log.info,"Get DHCPREQUEST_UNKNOWN_STATE packet : not implemented")
+
+ if self.backend.Request(packet) : packet.TransformToDhcpAckPacket()
+ else : packet.TransformToDhcpNackPacket()
+
+ self.SendPacket(packet)
+
+
+
+ # FIXME: These are not yet implemented.
+ def HandleDhcpDecline(self, packet):
+ Log.Output(Log.info, "Get DHCPDECLINE packet")
+ self.backend.Decline(packet)
+
+ def HandleDhcpRelease(self, packet):
+ Log.Output(Log.info,"Get DHCPRELEASE packet")
+ self.backend.Release(packet)
+
+ def HandleDhcpInform(self, packet):
+ Log.Output(Log.info, "Get DHCPINFORM packet")
+
+ if self.backend.Request(packet) :
+ packet.TransformToDhcpAckPacket()
+ # FIXME : Remove lease_time from options
+ self.SendPacket(packet)
+
+ # FIXME : what if false ?
+
+if '__main__' == __name__:
+ options = { "server_listen_port":67,
+ "client_listen_port":68,
+ "listen_address":"0.0.0.0"}
+ backend = DhcpBackend('postgres://sipb-xen@sipb-xen-dev/sipb_xen')
+ server = DhcpServer(backend, options)
+
+ while True : server.GetNextDhcpPacket()
projects / invirt/packages/invirt-dhcp.git / blobdiff