def sndrcv(pks, pkt, timeout=None, inter=0, verbose=None, chainCC=False,
retry=0, multi=False):
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
# do it here to fix random fields, so that parent and child have the same
tobesent = [p for p in pkt]
notans = len(tobesent)
if retry < 0:
retry = -retry
autostop = retry
else:
autostop = 0
while retry >= 0:
if timeout < 0:
timeout = None
stopevent = threading.Event()
thread = threading.Thread(
target=_sndrcv_snd,
args=(pks, timeout, inter, verbose, tobesent, stopevent),
)
thread.start()
hsent, ans, nbrecv, notans = _sndrcv_rcv(pks, tobesent, stopevent, nbrecv, notans, verbose, chainCC, multi)
thread.join()
remain = list(itertools.chain(*six.itervalues(hsent)))
if multi:
remain = [p for p in remain if not hasattr(p, '_answered')]
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 snd, _ in ans:
if hasattr(snd, '_answered'):
del snd._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 sndrcvflood(pks,
pkt,
inter=0,
verbose=None,
chainCC=False,
prn=lambda x: x):
if not verbose:
verbose = conf.verb
if not isinstance(pkt, Gen):
pkt = SetGen(pkt)
tobesent = [p for p in pkt]
received = plist.SndRcvList()
seen = {}
stopevent = threading.Event()
count_packets = six.moves.queue.Queue()
def send_in_loop(tobesent, stopevent, count_packets=count_packets):
"""Infinite generator that produces the same packet until stopevent is triggered."""
while True:
for p in tobesent:
if stopevent.is_set():
raise StopIteration()
count_packets.put(0)
yield p
infinite_gen = send_in_loop(tobesent, stopevent)
# We don't use _sndrcv_snd verbose (it messes the logs up as in a thread that ends after recieving)
thread = threading.Thread(
target=_sndrcv_snd,
args=(pks, None, inter, False, infinite_gen, stopevent),
)
thread.start()
hsent, ans, nbrecv, notans = _sndrcv_rcv(pks, tobesent, stopevent, 0,
len(tobesent), verbose, chainCC,
False)
thread.join()
remain = list(itertools.chain(*six.itervalues(hsent)))
# Apply prn
ans = [(x, prn(y)) for (x, y) in ans]
if verbose:
print(
"\nReceived %i packets, got %i answers, remaining %i packets. Sent a total of %i packets."
% (nbrecv + len(ans), len(ans), notans, count_packets.qsize()))
count_packets.empty()
del count_packets
return plist.SndRcvList(ans), plist.PacketList(remain, "Unanswered")
def sndrcvflood(pks, pkt, prn=lambda s_r:s_r[1].summary(), chainCC=0, store=1, unique=0):
if not isinstance(pkt, Gen):
pkt = SetGen(pkt)
tobesent = [p for p in pkt]
received = plist.SndRcvList()
seen = {}
hsent={}
for i in tobesent:
h = i.hashret()
if h in hsent:
hsent[h].append(i)
else:
hsent[h] = [i]
def send_in_loop(tobesent):
while True:
for p in tobesent:
yield p
packets_to_send = send_in_loop(tobesent)
ssock = rsock = pks.fileno()
try:
while True:
if conf.use_bpf:
from scapy.arch.bpf.supersocket import bpf_select
readyr = bpf_select([rsock])
_, readys, _ = select([], [ssock], [])
else:
readyr, readys, _ = select([rsock], [ssock], [])
if ssock in readys:
pks.send(packets_to_send.next())
if rsock in readyr:
p = pks.recv(MTU)
if p is None:
continue
h = p.hashret()
if h in hsent:
hlst = hsent[h]
for i in hlst:
if p.answers(i):
res = prn((i,p))
if unique:
if res in seen:
continue
seen[res] = None
if res is not None:
print(res)
if store:
received.append((i,p))
except KeyboardInterrupt:
if chainCC:
raise
return received
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 True:
parity ^= 1
col = [ct.even,ct.odd][parity]
if count is not None:
if count == 0:
break
count -= 1
start = time.time()
if verbose > 1:
print("\rsend...\r", end=' ')
res = srfunc(pkts, timeout=timeout, verbose=0, chainCC=True, *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), end=' ')
for p in res[0]:
print(col(prn(p)))
print(" "*len(msg), end=' ')
if verbose > 1 and prnfail and len(res[1]) > 0:
msg = "fail %i:" % len(res[1])
print("\r"+ct.fail(msg), end=' ')
for p in res[1]:
print(col(prnfail(p)))
print(" "*len(msg), end=' ')
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 not isinstance(
pks, StreamSocket) and (FREEBSD or 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 IOError, exc:
if exc.errno != 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, sentpkt in enumerate(hlst):
if r.answers(sentpkt):
ans.append((sentpkt, r))
if verbose > 1:
os.write(1, "*")
ok = 1
if not multi:
del hlst[i]
notans -= 1
else:
if not hasattr(
sentpkt, '_answered'):
notans -= 1
sentpkt._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 = list(itertools.chain(*hsent.itervalues()))
if multi:
remain = [p for p in remain if not hasattr(p, '_answered')]
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 sndrcv(pks,
pkt,
timeout=None,
inter=0,
verbose=None,
chainCC=False,
retry=0,
multi=False):
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
tobesent = [p for p in pkt]
notans = len(tobesent)
hsent = {}
for i in tobesent:
h = i.hashret()
hsent.setdefault(i.hashret(), []).append(i)
if retry < 0:
retry = -retry
autostop = retry
else:
autostop = 0
if WINDOWS:
def _get_pkt():
return pks.recv(MTU)
elif conf.use_bpf:
from scapy.arch.bpf.supersocket import bpf_select
def _get_pkt():
if bpf_select([pks]):
return pks.recv()
elif conf.use_pcap or (not isinstance(pks, StreamSocket) and
(DARWIN or FREEBSD or OPENBSD)):
def _get_pkt():
res = pks.nonblock_recv()
if res is None:
time.sleep(0.05)
return res
else:
def _get_pkt():
try:
inp, _, _ = select([pks], [], [], 0.05)
except (IOError, select_error) as exc:
# select.error has no .errno attribute
if exc.args[0] != errno.EINTR:
raise
else:
if inp:
return pks.recv(MTU)
if stopevent.is_set():
raise _BreakException()
while retry >= 0:
if timeout < 0:
timeout = None
stopevent = threading.Event()
thread = threading.Thread(
target=_sndrcv_snd,
args=(pks, timeout, inter, verbose, tobesent, stopevent),
)
thread.start()
try:
try:
while True:
r = _get_pkt()
if r is None:
if stopevent.is_set():
break
continue
ok = False
h = r.hashret()
if h in hsent:
hlst = hsent[h]
for i, sentpkt in enumerate(hlst):
if r.answers(sentpkt):
ans.append((sentpkt, r))
if verbose > 1:
os.write(1, b"*")
ok = True
if not multi:
del hlst[i]
notans -= 1
else:
if not hasattr(sentpkt, '_answered'):
notans -= 1
sentpkt._answered = 1
break
if notans == 0 and not multi:
break
if not ok:
if verbose > 1:
os.write(1, b".")
nbrecv += 1
if conf.debug_match:
debug.recv.append(r)
except KeyboardInterrupt:
if chainCC:
raise
except _BreakException:
pass
finally:
stopevent.set()
thread.join()
pks.close()
remain = list(itertools.chain(*six.itervalues(hsent)))
if multi:
remain = [p for p in remain if not hasattr(p, '_answered')]
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 snd, _ in ans:
if hasattr(snd, '_answered'):
del snd._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 sndrcv(pks, pkt, timeout = 2, 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
pid=1
try:
if WINDOWS or pid == 0:
try:
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 sending packets")
log_runtime.info("--- Error sending packets")
finally:
try:
sent_times = [p.sent_time for p in all_stimuli if p.sent_time]
except:
pass
if WINDOWS or pid > 0:
# Timeout starts after last packet is sent (as in Unix version)
if timeout:
stoptime = time.time()+timeout
else:
stoptime = 0
remaintime = None
# inmask = [pks.ins.fd]
try:
try:
while 1:
if stoptime:
remaintime = stoptime-time.time()
if remaintime <= 0:
break
r = pks.recv(MTU)
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, b"*")
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, b".")
nbrecv += 1
if conf.debug_match:
debug.recv.append(r)
except KeyboardInterrupt:
if chainCC:
raise
finally:
if WINDOWS:
for p,t in zip(all_stimuli, sent_times):
p.sent_time = t
finally:
pass
# remain = reduce(list.__add__, hsent.values(), [])
remain = list(itertools.chain(*[ i for i in hsent.values() ]))
if multi:
#remain = filter(lambda p: not hasattr(p, '_answered'), remain);
remain = [ p for p in remain if not hasattr(p, '_answered')]
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 sndrcvflood(pks,
pkt,
inter=0,
verbose=None,
chainCC=False,
store_unanswered=True,
process=None,
timeout=None): # noqa: E501
if not verbose:
verbose = conf.verb
listable = (isinstance(pkt, Packet)
and pkt.__iterlen__() == 1) or isinstance(pkt,
list) # noqa: E501
tobesent = pkt
use_prn_mode = False
_storage_policy = None
if process is not None:
use_prn_mode = True
_storage_policy = lambda x, y: process(x, y)
stopevent = threading.Event()
count_packets = six.moves.queue.Queue()
hsent = {}
timessent = {} if listable else None
def send_in_loop(tobesent, stopevent, count_packets=count_packets):
"""Infinite generator that produces the same packet until stopevent is triggered.""" # noqa: E501
while True:
for p in tobesent:
if stopevent.is_set():
raise StopIteration()
count_packets.put(0)
yield p
infinite_gen = send_in_loop(tobesent, stopevent)
def _timeout(timeout):
stopevent.wait(timeout)
stopevent.set()
timeout_thread = threading.Thread(target=_timeout, args=(timeout, ))
timeout_thread.setDaemon(True)
timeout_thread.start()
# We don't use _sndrcv_snd verbose (it messes the logs up as in a thread that ends after receiving) # noqa: E501
thread = threading.Thread(
target=_sndrcv_snd,
args=(pks, None, inter, False, infinite_gen, hsent, timessent,
stopevent), # noqa: E501
)
thread.setDaemon(True)
thread.start()
hsent, ans, nbrecv, notans = _sndrcv_rcv(pks,
hsent,
stopevent,
0,
len(tobesent),
verbose,
chainCC,
False,
_storage_policy=_storage_policy)
thread.join()
# Restore time_sent to original packets
if listable:
i = 0
for p in (pkt if isinstance(pkt, list) else [pkt]):
p.sent_time = timessent[i]
i += 1
if process is not None:
ans = [(x, process(y)) for (x, y) in ans] # Apply process
if store_unanswered:
if use_prn_mode:
remain = [
process(x, None)
for x in itertools.chain(*six.itervalues(hsent))
] # noqa: E501
else:
remain = list(itertools.chain(*six.itervalues(hsent)))
if verbose:
print(
"\nReceived %i packets, got %i answers, remaining %i packets. Sent a total of %i packets."
% (nbrecv + len(ans), len(ans), notans,
count_packets.qsize())) # noqa: E501
count_packets.empty()
del count_packets
ans_result = ans if use_prn_mode else plist.SndRcvList(ans)
unans_result = remain if use_prn_mode else (
None if not store_unanswered else plist.PacketList(
remain, "Unanswered")) # noqa: E501
return ans_result, unans_result
def sndrcv(pks,
pkt,
timeout=None,
inter=0,
verbose=None,
chainCC=False,
retry=0,
multi=False,
rcv_pks=None,
store_unanswered=True,
process=None,
prebuild=False):
"""Scapy raw function to send a packet and receive its answer.
WARNING: This is an internal function. Using sr/srp/sr1/srp is
more appropriate in many cases.
pks: SuperSocket instance to send/receive packets
pkt: the packet to send
rcv_pks: if set, will be used instead of pks to receive packets. packets will still # noqa: E501
be sent through pks
nofilter: put 1 to avoid use of BPF filters
retry: if positive, how many times to resend unanswered packets
if negative, how many times to retry when no more packets are answered # noqa: E501
timeout: how much time to wait after the last packet has been sent
verbose: set verbosity level
multi: whether to accept multiple answers for the same stimulus
store_unanswered: whether to store not-answered packets or not. Default True. # noqa: E501
setting it to False will increase speed, and will return None # noqa: E501
as the unans list.
process: if specified, only result from process(pkt) will be stored.
the function should follow the following format:
lambda sent, received: (func(sent), func2(received))
if the packet is unanswered, `received` will be None.
if `store_unanswered` is False, the function won't be called on un-answered packets. # noqa: E501
prebuild: pre-build the packets before starting to send them. Default to False. Automatically used # noqa: E501
when a generator is passed as the packet
"""
if verbose is None:
verbose = conf.verb
use_prn_mode = False
_storage_policy = None
if process is not None:
use_prn_mode = True
_storage_policy = lambda x, y: process(x, y)
debug.recv = plist.PacketList([], "Unanswered")
debug.sent = plist.PacketList([], "Sent")
debug.match = plist.SndRcvList([])
nbrecv = 0
ans = []
listable = (isinstance(pkt, Packet)
and pkt.__iterlen__() == 1) or isinstance(pkt,
list) # noqa: E501
# do it here to fix random fields, so that parent and child have the same
if isinstance(pkt, types.GeneratorType) or prebuild:
tobesent = [p for p in pkt]
notans = len(tobesent)
else:
tobesent = SetGen(pkt) if not isinstance(pkt, Gen) else pkt
notans = tobesent.__iterlen__()
if retry < 0:
autostop = retry = -retry
else:
autostop = 0
while retry >= 0:
if timeout is not None and timeout < 0:
timeout = None
stopevent = threading.Event()
hsent = {}
timessent = {} if listable else None
thread = threading.Thread(
target=_sndrcv_snd,
args=(pks, timeout, inter, verbose, tobesent, hsent, timessent,
stopevent), # noqa: E501
)
thread.setDaemon(True)
thread.start()
hsent, newans, nbrecv, notans = _sndrcv_rcv(
(rcv_pks or pks),
hsent,
stopevent,
nbrecv,
notans,
verbose,
chainCC,
multi, # noqa: E501
_storage_policy=_storage_policy,
)
thread.join()
ans.extend(newans)
# Restore time_sent to original packets
if listable:
i = 0
for p in (pkt if isinstance(pkt, list) else [pkt]):
p.sent_time = timessent[i]
i += 1
if store_unanswered:
remain = list(itertools.chain(*six.itervalues(hsent)))
if multi:
remain = [p for p in remain if not hasattr(p, '_answered')]
if autostop and len(remain) > 0 and len(remain) != len(tobesent):
retry = autostop
tobesent = remain
if len(tobesent) == 0:
break
else:
remain = []
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 snd, _ in ans:
if hasattr(snd, '_answered'):
del snd._answered
if verbose:
print("\nReceived %i packets, got %i answers, remaining %i packets" %
(nbrecv + len(ans), len(ans), notans)) # noqa: E501
if store_unanswered and use_prn_mode:
remain = [process(x, None) for x in remain]
ans_result = ans if use_prn_mode else plist.SndRcvList(ans)
unans_result = remain if use_prn_mode else (
None if not store_unanswered else plist.PacketList(
remain, "Unanswered")) # noqa: E501
return ans_result, unans_result
def sndrcv(pks,
pkt,
timeout=None,
inter=0,
verbose=None,
chainCC=False,
retry=0,
multi=False,
rcv_pks=None):
"""Scapy raw function to send a packet and recieve its answer.
WARNING: This is an internal function. Using sr/srp/sr1/srp is
more appropriate in many cases.
pks: SuperSocket instance to send/recieve packets
pkt: the packet to send
rcv_pks: if set, will be used instead of pks to recieve packets. packets will still
be sent through pks
nofilter: put 1 to avoid use of BPF filters
retry: if positive, how many times to resend unanswered packets
if negative, how many times to retry when no more packets are answered
timeout: how much time to wait after the last packet has been sent
verbose: set verbosity level
multi: whether to accept multiple answers for the same stimulus"""
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
tobesent = [p for p in pkt]
notans = len(tobesent)
if retry < 0:
retry = -retry
autostop = retry
else:
autostop = 0
while retry >= 0:
if timeout is not None and timeout < 0:
timeout = None
stopevent = threading.Event()
thread = threading.Thread(
target=_sndrcv_snd,
args=(pks, timeout, inter, verbose, tobesent, stopevent),
)
thread.start()
hsent, newans, nbrecv, notans = _sndrcv_rcv(
(rcv_pks or pks),
tobesent,
stopevent,
nbrecv,
notans,
verbose,
chainCC,
multi,
)
thread.join()
ans.extend(newans)
remain = list(itertools.chain(*six.itervalues(hsent)))
if multi:
remain = [p for p in remain if not hasattr(p, '_answered')]
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 snd, _ in ans:
if hasattr(snd, '_answered'):
del snd._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")