/usr/share/pyshared/scapy/arch/pcapdnet.py is in python-scapy 2.2.0-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 | ## 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
"""
Packet sending and receiving with libdnet and libpcap/WinPcap.
"""
import time,struct,sys
if not sys.platform.startswith("win"):
from fcntl import ioctl
from scapy.data import *
from scapy.config import conf
from scapy.utils import warning
from scapy.supersocket import SuperSocket
from scapy.error import Scapy_Exception
import scapy.arch
if conf.use_pcap:
try:
import pcap
except ImportError,e:
try:
import pcapy as pcap
except ImportError,e2:
if conf.interactive:
log_loading.error("Unable to import pcap module: %s/%s" % (e,e2))
conf.use_pcap = False
else:
raise
if conf.use_pcap:
# From BSD net/bpf.h
#BIOCIMMEDIATE=0x80044270
BIOCIMMEDIATE=-2147204496
if hasattr(pcap,"pcap"): # python-pypcap
class _PcapWrapper_pypcap:
def __init__(self, device, snaplen, promisc, to_ms):
try:
self.pcap = pcap.pcap(device, snaplen, promisc, immediate=1, timeout_ms=to_ms)
except TypeError:
# Older pypcap versions do not support the timeout_ms argument
self.pcap = pcap.pcap(device, snaplen, promisc, immediate=1)
def __getattr__(self, attr):
return getattr(self.pcap, attr)
open_pcap = lambda *args,**kargs: _PcapWrapper_pypcap(*args,**kargs)
elif hasattr(pcap,"pcapObject"): # python-libpcap
class _PcapWrapper_libpcap:
def __init__(self, *args, **kargs):
self.pcap = pcap.pcapObject()
self.pcap.open_live(*args, **kargs)
def setfilter(self, filter):
self.pcap.setfilter(filter, 0, 0)
def next(self):
c = self.pcap.next()
if c is None:
return
l,pkt,ts = c
return ts,pkt
def __getattr__(self, attr):
return getattr(self.pcap, attr)
open_pcap = lambda *args,**kargs: _PcapWrapper_libpcap(*args,**kargs)
elif hasattr(pcap,"open_live"): # python-pcapy
class _PcapWrapper_pcapy:
def __init__(self, *args, **kargs):
self.pcap = pcap.open_live(*args, **kargs)
def next(self):
try:
c = self.pcap.next()
except pcap.PcapError:
return None
else:
h,p = c
s,us = h.getts()
return (s+0.000001*us), p
def fileno(self):
warning("fileno: pcapy API does not permit to get capure file descriptor. Bugs ahead! Press Enter to trigger packet reading")
return 0
def __getattr__(self, attr):
return getattr(self.pcap, attr)
open_pcap = lambda *args,**kargs: _PcapWrapper_pcapy(*args,**kargs)
class PcapTimeoutElapsed(Scapy_Exception):
pass
class L2pcapListenSocket(SuperSocket):
desc = "read packets at layer 2 using libpcap"
def __init__(self, iface = None, type = ETH_P_ALL, promisc=None, filter=None):
self.type = type
self.outs = None
self.iface = iface
if iface is None:
iface = conf.iface
if promisc is None:
promisc = conf.sniff_promisc
self.promisc = promisc
self.ins = open_pcap(iface, 1600, self.promisc, 100)
try:
ioctl(self.ins.fileno(),BIOCIMMEDIATE,struct.pack("I",1))
except:
pass
if type == ETH_P_ALL: # Do not apply any filter if Ethernet type is given
if conf.except_filter:
if filter:
filter = "(%s) and not (%s)" % (filter, conf.except_filter)
else:
filter = "not (%s)" % conf.except_filter
if filter:
self.ins.setfilter(filter)
def close(self):
del(self.ins)
def recv(self, x=MTU):
ll = self.ins.datalink()
if ll in conf.l2types:
cls = conf.l2types[ll]
else:
cls = conf.default_l2
warning("Unable to guess datalink type (interface=%s linktype=%i). Using %s" % (self.iface, ll, cls.name))
pkt = None
while pkt is None:
pkt = self.ins.next()
if pkt is not None:
ts,pkt = pkt
if scapy.arch.WINDOWS and pkt is None:
raise PcapTimeoutElapsed
try:
pkt = cls(pkt)
except KeyboardInterrupt:
raise
except:
if conf.debug_dissector:
raise
pkt = conf.raw_layer(pkt)
pkt.time = ts
return pkt
def send(self, x):
raise Scapy_Exception("Can't send anything with L2pcapListenSocket")
conf.L2listen = L2pcapListenSocket
if conf.use_dnet:
try:
import dnet
except ImportError,e:
if conf.interactive:
log_loading.error("Unable to import dnet module: %s" % e)
conf.use_dnet = False
def get_if_raw_hwaddr(iff):
"dummy"
return (0,"\0\0\0\0\0\0")
def get_if_raw_addr(iff):
"dummy"
return "\0\0\0\0"
def get_if_list():
"dummy"
return []
else:
raise
else:
def get_if_raw_hwaddr(iff):
if iff == scapy.arch.LOOPBACK_NAME:
return (772, '\x00'*6)
try:
l = dnet.intf().get(iff)
l = l["link_addr"]
except:
raise Scapy_Exception("Error in attempting to get hw address for interface [%s]" % iff)
return l.type,l.data
def get_if_raw_addr(ifname):
i = dnet.intf()
return i.get(ifname)["addr"].data
def get_if_list():
return [i.get("name", None) for i in dnet.intf()]
if conf.use_pcap and conf.use_dnet:
class L3dnetSocket(SuperSocket):
desc = "read/write packets at layer 3 using libdnet and libpcap"
def __init__(self, type = ETH_P_ALL, filter=None, promisc=None, iface=None, nofilter=0):
self.iflist = {}
self.intf = dnet.intf()
if iface is None:
iface = conf.iface
self.iface = iface
self.ins = open_pcap(iface, 1600, 0, 100)
try:
ioctl(self.ins.fileno(),BIOCIMMEDIATE,struct.pack("I",1))
except:
pass
if nofilter:
if type != ETH_P_ALL: # PF_PACKET stuff. Need to emulate this for pcap
filter = "ether proto %i" % type
else:
filter = None
else:
if conf.except_filter:
if filter:
filter = "(%s) and not (%s)" % (filter, conf.except_filter)
else:
filter = "not (%s)" % conf.except_filter
if type != ETH_P_ALL: # PF_PACKET stuff. Need to emulate this for pcap
if filter:
filter = "(ether proto %i) and (%s)" % (type,filter)
else:
filter = "ether proto %i" % type
if filter:
self.ins.setfilter(filter)
def send(self, x):
iff,a,gw = x.route()
if iff is None:
iff = conf.iface
ifs,cls = self.iflist.get(iff,(None,None))
if ifs is None:
iftype = self.intf.get(iff)["type"]
if iftype == dnet.INTF_TYPE_ETH:
try:
cls = conf.l2types[1]
except KeyError:
warning("Unable to find Ethernet class. Using nothing")
ifs = dnet.eth(iff)
else:
ifs = dnet.ip()
self.iflist[iff] = ifs,cls
if cls is None:
sx = str(x)
else:
sx = str(cls()/x)
x.sent_time = time.time()
ifs.send(sx)
def recv(self,x=MTU):
ll = self.ins.datalink()
if ll in conf.l2types:
cls = conf.l2types[ll]
else:
cls = conf.default_l2
warning("Unable to guess datalink type (interface=%s linktype=%i). Using %s" % (self.iface, ll, cls.name))
pkt = self.ins.next()
if pkt is not None:
ts,pkt = pkt
if pkt is None:
return
try:
pkt = cls(pkt)
except KeyboardInterrupt:
raise
except:
if conf.debug_dissector:
raise
pkt = conf.raw_layer(pkt)
pkt.time = ts
return pkt.payload
def nonblock_recv(self):
self.ins.setnonblock(1)
p = self.recv()
self.ins.setnonblock(0)
return p
def close(self):
if hasattr(self, "ins"):
del(self.ins)
if hasattr(self, "outs"):
del(self.outs)
class L2dnetSocket(SuperSocket):
desc = "read/write packets at layer 2 using libdnet and libpcap"
def __init__(self, iface = None, type = ETH_P_ALL, filter=None, nofilter=0):
if iface is None:
iface = conf.iface
self.iface = iface
self.ins = open_pcap(iface, 1600, 0, 100)
try:
ioctl(self.ins.fileno(),BIOCIMMEDIATE,struct.pack("I",1))
except:
pass
if nofilter:
if type != ETH_P_ALL: # PF_PACKET stuff. Need to emulate this for pcap
filter = "ether proto %i" % type
else:
filter = None
else:
if conf.except_filter:
if filter:
filter = "(%s) and not (%s)" % (filter, conf.except_filter)
else:
filter = "not (%s)" % conf.except_filter
if type != ETH_P_ALL: # PF_PACKET stuff. Need to emulate this for pcap
if filter:
filter = "(ether proto %i) and (%s)" % (type,filter)
else:
filter = "ether proto %i" % type
if filter:
self.ins.setfilter(filter)
self.outs = dnet.eth(iface)
def recv(self,x=MTU):
ll = self.ins.datalink()
if ll in conf.l2types:
cls = conf.l2types[ll]
else:
cls = conf.default_l2
warning("Unable to guess datalink type (interface=%s linktype=%i). Using %s" % (self.iface, ll, cls.name))
pkt = self.ins.next()
if pkt is not None:
ts,pkt = pkt
if pkt is None:
return
try:
pkt = cls(pkt)
except KeyboardInterrupt:
raise
except:
if conf.debug_dissector:
raise
pkt = conf.raw_layer(pkt)
pkt.time = ts
return pkt
def nonblock_recv(self):
self.ins.setnonblock(1)
p = self.recv(MTU)
self.ins.setnonblock(0)
return p
def close(self):
if hasattr(self, "ins"):
del(self.ins)
if hasattr(self, "outs"):
del(self.outs)
conf.L3socket=L3dnetSocket
conf.L2socket=L2dnetSocket
|