This file is indexed.

/usr/lib/python3/dist-packages/scapy/route.py is in python3-scapy 0.23-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
## This file is part of Scapy
## See http://www.secdev.org/projects/scapy for more informations
## Copyright (C) Philippe Biondi <phil@secdev.org>
## This program is published under a GPLv2 license

"""
Routing and handling of network interfaces.
"""

import socket
from scapy.arch import read_routes,get_if_addr,LOOPBACK_NAME
from scapy.utils import atol,ltoa,itom
from scapy.config import conf
from scapy.error import Scapy_Exception,warning

##############################
## Routing/Interfaces stuff ##
##############################

class Route:
    def __init__(self):
        self.resync()
        self.s=socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self.cache = {}

    def invalidate_cache(self):
        self.cache = {}

    def resync(self):
        self.invalidate_cache()
        self.routes = read_routes()

    def __repr__(self):
        rt = "Network         Netmask         Gateway         Iface           Output IP\n"
        for net,msk,gw,iface,addr in self.routes:
            rt += "%-15s %-15s %-15s %-15s %-15s\n" % (ltoa(net),
                                              ltoa(msk),
                                              gw,
                                              iface,
                                              addr)
        return rt

    def make_route(self, host=None, net=None, gw=None, dev=None):
        if host is not None:
            thenet,msk = host,32
        elif net is not None:
            thenet,msk = net.split("/")
            msk = int(msk)
        else:
            raise Scapy_Exception("make_route: Incorrect parameters. You should specify a host or a net")
        if gw is None:
            gw="0.0.0.0"
        if dev is None:
            if gw:
                nhop = gw
            else:
                nhop = thenet
            dev,ifaddr,x = self.route(nhop)
        else:
            ifaddr = get_if_addr(dev)
        return (atol(thenet), itom(msk), gw, dev, ifaddr)

    def add(self, *args, **kargs):
        """Ex:
        add(net="192.168.1.0/24",gw="1.2.3.4")
        """
        self.invalidate_cache()
        self.routes.append(self.make_route(*args,**kargs))

        
    def delt(self,  *args, **kargs):
        """delt(host|net, gw|dev)"""
        self.invalidate_cache()
        route = self.make_route(*args,**kargs)
        try:
            i=self.routes.index(route)
            del(self.routes[i])
        except ValueError:
            warning("no matching route found")
             
    def ifchange(self, iff, addr):
        self.invalidate_cache()
        the_addr,the_msk = (addr.split("/")+["32"])[:2]
        the_msk = itom(int(the_msk))
        the_rawaddr = atol(the_addr)
        the_net = the_rawaddr & the_msk
        
        
        for i in range(len(self.routes)):
            net,msk,gw,iface,addr = self.routes[i]
            if iface != iff:
                continue
            if gw == '0.0.0.0':
                self.routes[i] = (the_net,the_msk,gw,iface,the_addr)
            else:
                self.routes[i] = (net,msk,gw,iface,the_addr)
        conf.netcache.flush()
        
                

    def ifdel(self, iff):
        self.invalidate_cache()
        new_routes=[]
        for rt in self.routes:
            if rt[3] != iff:
                new_routes.append(rt)
        self.routes=new_routes
        
    def ifadd(self, iff, addr):
        self.invalidate_cache()
        the_addr,the_msk = (addr.split("/")+["32"])[:2]
        the_msk = itom(int(the_msk))
        the_rawaddr = atol(the_addr)
        the_net = the_rawaddr & the_msk
        self.routes.append((the_net,the_msk,'0.0.0.0',iff,the_addr))


    def route(self,dest,verbose=None):
        if type(dest) is list and dest:
            dest = dest[0]
        if dest in self.cache:
            return self.cache[dest]
        if verbose is None:
            verbose=conf.verb
        # Transform "192.168.*.1-5" to one IP of the set
        dst = dest.split("/")[0]
        dst = dst.replace("*","0") 
        while True:
            l = dst.find("-")
            if l < 0:
                break
            m = (dst[l:]+".").find(".")
            dst = dst[:l]+dst[l+m:]

            
        dst = atol(dst)
        pathes=[]
        for d,m,gw,i,a in self.routes:
            aa = atol(a)
            #Commented out after issue with virtual network with local address 0.0.0.0
            #if aa == dst:
            #    pathes.append((0xffffffff,(LOOPBACK_NAME,a,"0.0.0.0")))
            if (dst & m) == (d & m):
                pathes.append((m,(i,a,gw)))
        if not pathes:
            if verbose:
                warning("No route found (no default route?)")
            return LOOPBACK_NAME,"0.0.0.0","0.0.0.0" #XXX linux specific!
        # Choose the more specific route (greatest netmask).
        # XXX: we don't care about metrics
        pathes.sort()
        ret = pathes[-1][1]
        self.cache[dest] = ret
        return ret
            
    def get_if_bcast(self, iff):
        for net, msk, gw, iface, addr in self.routes:
            if (iff == iface and net != 0):
                bcast = atol(addr)|(~msk&0xffffffff); # FIXME: check error in atol()
                return ltoa(bcast);
        warning("No broadcast address found for iface %s\n" % iff);

conf.route=Route()

#XXX use "with"
_betteriface = conf.route.route("0.0.0.0", verbose=0)[0]
if _betteriface != LOOPBACK_NAME:
    conf.iface = _betteriface
del(_betteriface)