/usr/lib/python3/dist-packages/scapy/route6.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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 | ## 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
## Copyright (C) 2005 Guillaume Valadon <guedou@hongo.wide.ad.jp>
## Arnaud Ebalard <arnaud.ebalard@eads.net>
"""
Routing and network interface handling for IPv6.
"""
#############################################################################
#############################################################################
### Routing/Interfaces stuff ###
#############################################################################
#############################################################################
import socket
from .config import conf
from .utils6 import *
from .arch import *
class Route6:
def __init__(self):
self.invalidate_cache()
self.resync()
def invalidate_cache(self):
self.cache = {}
def flush(self):
self.invalidate_cache()
self.routes = []
def resync(self):
# TODO : At the moment, resync will drop existing Teredo routes
# if any. Change that ...
self.invalidate_cache()
self.routes = read_routes6()
if self.routes == []:
log_loading.info("No IPv6 support in kernel")
def __repr__(self):
rtlst = [('Destination', 'Next Hop', "iface", "src candidates")]
for net,msk,gw,iface,cset in self.routes:
rtlst.append(('%s/%i'% (net,msk), gw, iface, ", ".join(cset)))
#colwidth = map(lambda x: max(map(lambda y: len(y), x)), apply(zip, rtlst))
zipped_rtlst = list(zip(*rtlst))
colwidth = [ max([len(y) for y in x]) for x in zipped_rtlst]
fmt = " ".join(map(lambda x: "%%-%ds"%x, colwidth))
rt = "\n".join([ fmt % x for x in rtlst])
return rt
# Unlike Scapy's Route.make_route() function, we do not have 'host' and 'net'
# parameters. We only have a 'dst' parameter that accepts 'prefix' and
# 'prefix/prefixlen' values.
# WARNING: Providing a specific device will at the moment not work correctly.
def make_route(self, dst, gw=None, dev=None):
"""Internal function : create a route for 'dst' via 'gw'.
"""
prefix, plen = (dst.split("/")+["128"])[:2]
plen = int(plen)
if gw is None:
gw = "::"
if dev is None:
dev, ifaddr, x = self.route(gw)
else:
# TODO: do better than that
# replace that unique address by the list of all addresses
lifaddr = in6_getifaddr()
#filter(lambda x: x[2] == dev, lifaddr)
devaddrs = [ i for i in lifaddr if i[2] == dev]
ifaddr = construct_source_candidate_set(prefix, plen, devaddrs, LOOPBACK_NAME)
return (prefix, plen, gw, dev, ifaddr)
def add(self, *args, **kargs):
"""Ex:
add(dst="2001:db8:cafe:f000::/56")
add(dst="2001:db8:cafe:f000::/56", gw="2001:db8:cafe::1")
add(dst="2001:db8:cafe:f000::/64", gw="2001:db8:cafe::1", dev="eth0")
"""
self.invalidate_cache()
self.routes.append(self.make_route(*args, **kargs))
def delt(self, dst, gw=None):
""" Ex:
delt(dst="::/0")
delt(dst="2001:db8:cafe:f000::/56")
delt(dst="2001:db8:cafe:f000::/56", gw="2001:db8:deca::1")
"""
tmp = dst+b"/128"
dst, plen = tmp.split(b'/')[:2]
dst = in6_ptop(dst)
plen = int(plen)
#l = filter(lambda x: in6_ptop(x[0]) == dst and x[1] == plen, self.routes)
l = [ x for x in self.routes if in6_ptop(x[0]) == dst and x[1] == plen ]
if gw:
gw = in6_ptop(gw)
#l = filter(lambda x: in6_ptop(x[0]) == gw, self.routes)
l = [ x for x in self.routes if in6_ptop(x[0]) == gw ]
if len(l) == 0:
warning("No matching route found")
elif len(l) > 1:
warning("Found more than one match. Aborting.")
else:
i=self.routes.index(l[0])
self.invalidate_cache()
del(self.routes[i])
def ifchange(self, iff, addr):
the_addr, the_plen = (addr.split("/")+["128"])[:2]
the_plen = int(the_plen)
naddr = inet_pton(socket.AF_INET6, the_addr)
nmask = in6_cidr2mask(the_plen)
the_net = inet_ntop(socket.AF_INET6, in6_and(nmask,naddr))
for i in range(len(self.routes)):
net,plen,gw,iface,addr = self.routes[i]
if iface != iff:
continue
if gw == '::':
self.routes[i] = (the_net,the_plen,gw,iface,the_addr)
else:
self.routes[i] = (net,the_plen,gw,iface,the_addr)
self.invalidate_cache()
ip6_neigh_cache.flush()
def ifdel(self, iff):
""" removes all route entries that uses 'iff' interface. """
new_routes=[]
for rt in self.routes:
if rt[3] != iff:
new_routes.append(rt)
self.invalidate_cache()
self.routes = new_routes
def ifadd(self, iff, addr):
"""
Add an interface 'iff' with provided address into routing table.
Ex: ifadd('eth0', '2001:bd8:cafe:1::1/64') will add following entry into
Scapy6 internal routing table:
Destination Next Hop iface Def src @
2001:bd8:cafe:1::/64 :: eth0 2001:bd8:cafe:1::1
prefix length value can be omitted. In that case, a value of 128
will be used.
"""
addr, plen = (addr.split(b"/")+[b"128"])[:2]
addr = in6_ptop(addr)
plen = int(plen)
naddr = inet_pton(socket.AF_INET6, addr)
nmask = in6_cidr2mask(plen)
prefix = inet_ntop(socket.AF_INET6, in6_and(nmask,naddr))
self.invalidate_cache()
self.routes.append((prefix,plen,'::',iff,[addr]))
def route(self, dst, dev=None):
"""
Provide best route to IPv6 destination address, based on Scapy6
internal routing table content.
When a set of address is passed (e.g. 2001:db8:cafe:*::1-5) an address
of the set is used. Be aware of that behavior when using wildcards in
upper parts of addresses !
If 'dst' parameter is a FQDN, name resolution is performed and result
is used.
if optional 'dev' parameter is provided a specific interface, filtering
is performed to limit search to route associated to that interface.
"""
# Transform "2001:db8:cafe:*::1-5:0/120" to one IPv6 address of the set
dst = dst.split("/")[0]
savedst = dst # In case following inet_pton() fails
dst = dst.replace("*","0")
l = dst.find("-")
while l >= 0:
m = (dst[l:]+":").find(":")
dst = dst[:l]+dst[l+m:]
l = dst.find("-")
try:
inet_pton(socket.AF_INET6, dst)
except socket.error:
dst = socket.getaddrinfo(savedst, None, socket.AF_INET6)[0][-1][0]
# TODO : Check if name resolution went well
# Deal with dev-specific request for cache search
k = dst
if dev is not None:
k = dst + "%%" + dev
if k in self.cache:
return self.cache[k]
pathes = []
# TODO : review all kinds of addresses (scope and *cast) to see
# if we are able to cope with everything possible. I'm convinced
# it's not the case.
# -- arnaud
for p, plen, gw, iface, cset in self.routes:
if dev is not None and iface != dev:
continue
if in6_isincluded(dst, p, plen):
pathes.append((plen, (iface, cset, gw)))
elif (in6_ismlladdr(dst) and in6_islladdr(p) and in6_islladdr(cset[0])):
pathes.append((plen, (iface, cset, gw)))
if not pathes:
warning("No route found for IPv6 destination %s (no default route?). This affects only IPv6" % dst)
return (LOOPBACK_NAME, "::", "::") # XXX Linux specific
# Sort with longest prefix first
pathes.sort(reverse=True)
best_plen = pathes[0][0]
pathes = filter(lambda x: x[0] == best_plen, pathes)
res = []
for p in pathes: # Here we select best source address for every route
tmp = p[1]
srcaddr = get_source_addr_from_candidate_set(dst, p[1][1])
if srcaddr is not None:
res.append((p[0], (tmp[0], srcaddr, tmp[2])))
if res == []:
warning("Found a route for IPv6 destination '%s', but no possible source address. This affects only IPv6" % dst)
return (LOOPBACK_NAME, b"::", b"::") # XXX Linux specific
# Symptom : 2 routes with same weight (our weight is plen)
# Solution :
# - dst is unicast global. Check if it is 6to4 and we have a source
# 6to4 address in those available
# - dst is link local (unicast or multicast) and multiple output
# interfaces are available. Take main one (conf.iface6)
# - if none of the previous or ambiguity persists, be lazy and keep
# first one
# XXX TODO : in a _near_ future, include metric in the game
if len(res) > 1:
tmp = []
if in6_isgladdr(dst) and in6_isaddr6to4(dst):
# TODO : see if taking the longest match between dst and
# every source addresses would provide better results
#tmp = filter(lambda x: in6_isaddr6to4(x[1][1]), res)
tmp = [ x for x in res if in6_isaddr6to4(x[1][1]) ]
elif in6_ismaddr(dst) or in6_islladdr(dst):
# TODO : I'm sure we are not covering all addresses. Check that
#tmp = filter(lambda x: x[1][0] == conf.iface6, res)
tmp = [ x for x in res if x[1][0] == conf.iface6 ]
if tmp:
res = tmp
# Fill the cache (including dev-specific request)
k = dst
if dev is not None:
k = dst + "%%" + dev
self.cache[k] = res[0][1]
return res[0][1]
conf.route6 = Route6()
_res = conf.route6.route("::/0")
if _res:
iff, gw, addr = _res
conf.iface6 = iff
del(_res)
|