def bridge_and_sniff(if1, if2, count=0, store=1, offline=None, prn = None, lfilter=None, L2socket=None, timeout=None,
stop_filter=None, *args, **kargs):
"""Forward traffic between two interfaces and sniff packets exchanged
bridge_and_sniff([count=0,] [prn=None,] [store=1,] [offline=None,] [lfilter=None,] + L2Socket args) -> list of packets
count: number of packets to capture. 0 means infinity
store: wether to store sniffed packets or discard them
prn: function to apply to each packet. If something is returned,
it is displayed. Ex:
ex: prn = lambda x: x.summary()
lfilter: python function applied to each packet to determine
if further action may be done
ex: lfilter = lambda x: x.haslayer(Padding)
timeout: stop sniffing after a given time (default: None)
L2socket: use the provided L2socket
stop_filter: python function applied to each packet to determine
if we have to stop the capture after this packet
ex: stop_filter = lambda x: x.haslayer(TCP)
"""
c = 0
if L2socket is None:
L2socket = conf.L2socket
s1 = L2socket(iface=if1)
s2 = L2socket(iface=if2)
peerof={s1:s2,s2:s1}
label={s1:if1, s2:if2}
lst = []
if timeout is not None:
stoptime = time.time()+timeout
remain = None
try:
while True:
if timeout is not None:
remain = stoptime-time.time()
if remain <= 0:
break
ins,outs,errs = select([s1,s2],[],[], remain)
for s in ins:
p = s.recv()
if p is not None:
peerof[s].send(p.original)
if lfilter and not lfilter(p):
continue
if store:
p.sniffed_on = label[s]
lst.append(p)
c += 1
if prn:
r = prn(p)
if r is not None:
print "%s: %s" % (label[s],r)
if stop_filter and stop_filter(p):
break
if count > 0 and c >= count:
break
except KeyboardInterrupt:
pass
finally:
return plist.PacketList(lst,"Sniffed")
def sniff(count=0, store=1, offline=None, prn = None, lfilter=None, L2socket=None, timeout=None, opened_socket=None, *arg, **karg):
"""Sniff packets
sniff([count=0,] [prn=None,] [store=1,] [offline=None,] [lfilter=None,] + L2ListenSocket args) -> list of packets
count: number of packets to capture. 0 means infinity
store: wether to store sniffed packets or discard them
prn: function to apply to each packet. If something is returned,
it is displayed. Ex:
ex: prn = lambda x: x.summary()
lfilter: python function applied to each packet to determine
if further action may be done
ex: lfilter = lambda x: x.haslayer(Padding)
offline: pcap file to read packets from, instead of sniffing them
timeout: stop sniffing after a given time (default: None)
L2socket: use the provided L2socket
opened_socket: provide an object ready to use .recv() on
"""
c = 0
if opened_socket is not None:
s = opened_socket
else:
if offline is None:
if L2socket is None:
L2socket = conf.L2listen
s = L2socket(type=ETH_P_ALL, *arg, **karg)
else:
s = PcapReader(offline)
lst = []
if timeout is not None:
stoptime = time.time()+timeout
remain = None
while 1:
try:
if timeout is not None:
remain = stoptime-time.time()
if remain <= 0:
break
sel = select([s],[],[],remain)
if s in sel[0]:
p = s.recv(MTU)
if p is None:
break
if lfilter and not lfilter(p):
continue
if store:
lst.append(p)
c += 1
if prn:
r = prn(p)
if r is not None:
print r
if count > 0 and c >= count:
break
except KeyboardInterrupt:
break
if opened_socket is None:
s.close()
return plist.PacketList(lst,"Sniffed")
def __gen_send(s,
x,
inter=0,
loop=0,
count=None,
verbose=None,
realtime=None,
return_packets=False,
*args,
**kargs):
if type(x) is str:
x = conf.raw_layer(load=x)
if not isinstance(x, Gen):
x = SetGen(x)
if verbose is None:
verbose = conf.verb
n = 0
if count is not None:
loop = -count
elif not loop:
loop = -1
if return_packets:
sent_packets = plist.PacketList()
try:
while loop:
dt0 = None
for p in x:
if realtime:
ct = time.time()
if dt0:
st = dt0 + p.time - ct
if st > 0:
time.sleep(st)
else:
dt0 = ct - p.time
s.send(p)
if return_packets:
sent_packets.append(p)
n += 1
if verbose:
os.write(1, ".")
time.sleep(inter)
if loop < 0:
loop += 1
except KeyboardInterrupt:
pass
s.close()
if verbose:
print "\nSent %i packets." % n
if return_packets:
return sent_packets
def __sr_loop(srfunc, pkts, prn=lambda x:x[1].summary(), prnfail=lambda x:x.summary(), inter=1, timeout=None, count=None, verbose=None, store=1, *args, **kargs):
n = 0
r = 0
ct = conf.color_theme
if verbose is None:
verbose = conf.verb
parity = 0
ans=[]
unans=[]
if timeout is None:
timeout = min(2*inter, 5)
try:
while 1:
parity ^= 1
col = [ct.even,ct.odd][parity]
if count is not None:
if count == 0:
break
count -= 1
start = time.time()
print "\rsend...\r",
res = srfunc(pkts, timeout=timeout, verbose=0, chainCC=1, *args, **kargs)
n += len(res[0])+len(res[1])
r += len(res[0])
if verbose > 1 and prn and len(res[0]) > 0:
msg = "RECV %i:" % len(res[0])
print "\r"+ct.success(msg),
for p in res[0]:
print col(prn(p))
print " "*len(msg),
if verbose > 1 and prnfail and len(res[1]) > 0:
msg = "fail %i:" % len(res[1])
print "\r"+ct.fail(msg),
for p in res[1]:
print col(prnfail(p))
print " "*len(msg),
if verbose > 1 and not (prn or prnfail):
print "recv:%i fail:%i" % tuple(map(len, res[:2]))
if store:
ans += res[0]
unans += res[1]
end=time.time()
if end-start < inter:
time.sleep(inter+start-end)
except KeyboardInterrupt:
pass
if verbose and n>0:
print ct.normal("\nSent %i packets, received %i packets. %3.1f%% hits." % (n,r,100.0*r/n))
return plist.SndRcvList(ans),plist.PacketList(unans)
def sndrcv(pks, pkt, timeout = None, inter = 0, verbose=None, chainCC=0, retry=0, multi=0):
if not isinstance(pkt, Gen):
pkt = SetGen(pkt)
if verbose is None:
verbose = conf.verb
debug.recv = plist.PacketList([],"Unanswered")
debug.sent = plist.PacketList([],"Sent")
debug.match = plist.SndRcvList([])
nbrecv=0
ans = []
# do it here to fix random fields, so that parent and child have the same
all_stimuli = tobesent = [p for p in pkt]
notans = len(tobesent)
hsent={}
for i in tobesent:
h = i.hashret()
if h in hsent:
hsent[h].append(i)
else:
hsent[h] = [i]
if retry < 0:
retry = -retry
autostop=retry
else:
autostop=0
while retry >= 0:
found=0
if timeout < 0:
timeout = None
rdpipe,wrpipe = os.pipe()
rdpipe=os.fdopen(rdpipe)
wrpipe=os.fdopen(wrpipe,"w")
pid=1
try:
pid = os.fork()
if pid == 0:
try:
sys.stdin.close()
rdpipe.close()
try:
i = 0
if verbose:
print "Begin emission:"
for p in tobesent:
pks.send(p)
i += 1
time.sleep(inter)
if verbose:
print "Finished to send %i packets." % i
except SystemExit:
pass
except KeyboardInterrupt:
pass
except:
log_runtime.exception("--- Error in child %i" % os.getpid())
log_runtime.info("--- Error in child %i" % os.getpid())
finally:
try:
os.setpgrp() # Chance process group to avoid ctrl-C
sent_times = [p.sent_time for p in all_stimuli if p.sent_time]
cPickle.dump( (conf.netcache,sent_times), wrpipe )
wrpipe.close()
except:
pass
elif pid < 0:
log_runtime.error("fork error")
else:
wrpipe.close()
stoptime = 0
remaintime = None
inmask = [rdpipe,pks]
try:
try:
while 1:
if stoptime:
remaintime = stoptime-time.time()
if remaintime <= 0:
break
r = None
if arch.FREEBSD or arch.DARWIN:
inp, out, err = select(inmask,[],[], 0.05)
if len(inp) == 0 or pks in inp:
r = pks.nonblock_recv()
else:
inp = []
try:
inp, out, err = select(inmask,[],[], remaintime)
except Exception,e:
if e[0] != errno.EINTR: raise
if len(inp) == 0:
break
if pks in inp:
r = pks.recv(MTU)
if rdpipe in inp:
if timeout:
stoptime = time.time()+timeout
del(inmask[inmask.index(rdpipe)])
if r is None:
continue
ok = 0
h = r.hashret()
if h in hsent:
hlst = hsent[h]
for i in range(len(hlst)):
if r.answers(hlst[i]):
ans.append((hlst[i],r))
if verbose > 1:
os.write(1, "*")
ok = 1
if not multi:
del(hlst[i])
notans -= 1;
else:
if not hasattr(hlst[i], '_answered'):
notans -= 1;
hlst[i]._answered = 1;
break
if notans == 0 and not multi:
break
if not ok:
if verbose > 1:
os.write(1, ".")
nbrecv += 1
if conf.debug_match:
debug.recv.append(r)
except KeyboardInterrupt:
if chainCC:
raise
finally:
try:
nc,sent_times = cPickle.load(rdpipe)
except EOFError:
warning("Child died unexpectedly. Packets may have not been sent %i"%os.getpid())
else:
conf.netcache.update(nc)
for p,t in zip(all_stimuli, sent_times):
p.sent_time = t
os.waitpid(pid,0)
finally:
if pid == 0:
os._exit(0)
remain = reduce(list.__add__, hsent.values(), [])
if multi:
remain = filter(lambda p: not hasattr(p, '_answered'), remain);
if autostop and len(remain) > 0 and len(remain) != len(tobesent):
retry = autostop
tobesent = remain
if len(tobesent) == 0:
break
retry -= 1
if conf.debug_match:
debug.sent=plist.PacketList(remain[:],"Sent")
debug.match=plist.SndRcvList(ans[:])
#clean the ans list to delete the field _answered
if (multi):
for s,r in ans:
if hasattr(s, '_answered'):
del(s._answered)
if verbose:
print "\nReceived %i packets, got %i answers, remaining %i packets" % (nbrecv+len(ans), len(ans), notans)
return plist.SndRcvList(ans),plist.PacketList(remain,"Unanswered")
def read_all(self,count=-1):
res = RawPcapReader.read_all(self, count)
import plist
return plist.PacketList(res,name = os.path.basename(self.filename))
def sniff(count=0,
store=1,
offline=None,
prn=None,
lfilter=None,
L2socket=None,
timeout=None,
opened_socket=None,
stop_filter=None,
iface=None,
*arg,
**karg):
"""Sniff packets
sniff([count=0,] [prn=None,] [store=1,] [offline=None,]
[lfilter=None,] + L2ListenSocket args) -> list of packets
count: number of packets to capture. 0 means infinity
store: wether to store sniffed packets or discard them
prn: function to apply to each packet. If something is returned,
it is displayed. Ex:
ex: prn = lambda x: x.summary()
lfilter: python function applied to each packet to determine
if further action may be done
ex: lfilter = lambda x: x.haslayer(Padding)
offline: pcap file to read packets from, instead of sniffing them
timeout: stop sniffing after a given time (default: None)
L2socket: use the provided L2socket
opened_socket: provide an object ready to use .recv() on
stop_filter: python function applied to each packet to determine
if we have to stop the capture after this packet
ex: stop_filter = lambda x: x.haslayer(TCP)
iface: interface or list of interfaces (default: None for sniffing on all
interfaces)
"""
c = 0
label = {}
sniff_sockets = []
if opened_socket is not None:
sniff_sockets = [opened_socket]
else:
if offline is None:
if L2socket is None:
L2socket = conf.L2listen
if type(iface) is list:
for i in iface:
s = L2socket(type=ETH_P_ALL, iface=i, *arg, **karg)
label[s] = i
sniff_sockets.append(s)
else:
sniff_sockets = [
L2socket(type=ETH_P_ALL, iface=iface, *arg, **karg)
]
else:
sniff_sockets = [PcapReader(offline)]
lst = []
if timeout is not None:
stoptime = time.time() + timeout
remain = None
try:
stop_event = False
while not stop_event:
if timeout is not None:
remain = stoptime - time.time()
if remain <= 0:
break
sel = select(sniff_sockets, [], [], remain)
for s in sel[0]:
p = s.recv()
if p is not None:
if lfilter and not lfilter(p):
continue
if s in label:
p.sniffed_on = label[s]
if store:
lst.append(p)
c += 1
if prn:
r = prn(p)
if r is not None:
print r
if stop_filter and stop_filter(p):
stop_event = True
break
if count > 0 and c >= count:
stop_event = True
break
except KeyboardInterrupt:
pass
if opened_socket is None:
s.close()
return plist.PacketList(lst, "Sniffed")