170 lines
5.2 KiB
Python
Executable file
170 lines
5.2 KiB
Python
Executable file
#!/usr/bin/env python
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#
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# Copyright (C) 2009 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""Return information about routing table entries
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Read and parse the system routing table. There are
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two classes defined here: NetworkRoutes, which contains
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information about all routes, and Route, which describes
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a single routing table entry.
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"""
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ROUTES_FILE = "/proc/net/route"
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# The following constants are from <net/route.h>
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RTF_UP = 0x0001
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RTF_GATEWAY = 0x0002
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RTF_HOST = 0x0004
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import socket
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import struct
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def intToDottedQuad(addr):
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return socket.inet_ntoa(struct.pack('@I', addr))
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def convertIpToInt(i):
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"""Convert the supplied argument to an int representing an IP address."""
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if isinstance(i, int):
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return i
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return struct.unpack('I', socket.inet_aton(i))[0]
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class Route(object):
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def __init__(self, iface, dest, gway, flags, mask):
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self.interface = iface
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self.destination = int(dest, 16)
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self.gateway = int(gway, 16)
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self.flagbits = int(flags, 16)
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self.netmask = int(mask, 16)
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def __str__(self):
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flags = ""
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if self.flagbits & RTF_UP:
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flags += "U"
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if self.flagbits & RTF_GATEWAY:
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flags += "G"
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if self.flagbits & RTF_HOST:
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flags += "H"
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return "<%s dest: %s gway: %s mask: %s flags: %s>" % (
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self.interface,
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intToDottedQuad(self.destination),
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intToDottedQuad(self.gateway),
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intToDottedQuad(self.netmask),
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flags)
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def isUsable(self):
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return self.flagbits & RTF_UP
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def isHostRoute(self):
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return self.flagbits & RTF_HOST
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def isGatewayRoute(self):
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return self.flagbits & RTF_GATEWAY
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def isInterfaceRoute(self):
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return (self.flagbits & RTF_GATEWAY) == 0
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def isDefaultRoute(self):
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return (self.flagbits & RTF_GATEWAY) and self.destination == 0
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def matches(self, ip):
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return (ip & self.netmask) == self.destination
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class NetworkRoutes(object):
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def __init__(self, routelist=None):
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if not routelist:
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routef = open(ROUTES_FILE)
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routelist = routef.readlines()
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routef.close()
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# The first line is headers that will allow us
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# to correctly interpret the values in the following
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# lines
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colMap = {}
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headers = routelist[0].split()
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for (pos, token) in enumerate(headers):
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colMap[token] = pos
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self.routes = []
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for routeline in routelist[1:]:
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route = routeline.split()
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interface = route[colMap["Iface"]]
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destination = route[colMap["Destination"]]
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gateway = route[colMap["Gateway"]]
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flags = route[colMap["Flags"]]
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mask = route[colMap["Mask"]]
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self.routes.append(
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Route(interface, destination, gateway, flags, mask))
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def hasDefaultRoute(self, interface):
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for rr in self.routes:
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if (rr.isUsable() and
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rr.interface == interface and
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rr.isDefaultRoute()):
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return True
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return False
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def getDefaultRoutes(self):
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defroutes = []
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for rr in self.routes:
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if rr.isUsable() and rr.isDefaultRoute():
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defroutes.append(rr)
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return defroutes
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def hasInterfaceRoute(self, interface):
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for rr in self.routes:
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if (rr.isUsable() and
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rr.interface == interface and
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rr.isInterfaceRoute()):
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return True
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return False
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def getRouteFor(self, ip_as_int_or_string):
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ip = convertIpToInt(ip_as_int_or_string)
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for rr in self.routes:
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if rr.isUsable() and rr.matches(ip):
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return rr
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return None
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if __name__ == "__main__":
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routes = NetworkRoutes()
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if routes == None:
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print "Failed to read routing table"
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else:
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for each_route in routes.routes:
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print each_route
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print "hasDefaultRoute(\"eth0\"):", routes.hasDefaultRoute("eth0")
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dflts = routes.getDefaultRoutes()
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if dflts == None:
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print "There are no default routes"
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else:
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print "There are %d default routes" % (len(dflts))
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print "hasInterfaceRoute(\"eth0\"):", routes.hasInterfaceRoute("eth0")
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routes = NetworkRoutes([
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"Iface Destination Gateway Flags RefCnt "
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"Use Metric Mask MTU Window IRTT",
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"ones 00010203 FE010203 0007 0 0 0 00FFFFFF 0 0 0\n",
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"default 00000000 09080706 0007 0 0 0 00000000 0 0 0\n",
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])
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print routes.getRouteFor(0x01010203)
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print routes.getRouteFor("3.2.1.1")
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print routes.getRouteFor(0x08010209)
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