AsyncSniffer cannot handle interface linktype when change linktype in code #4589
Description
Brief description
AsyncSniffer will call resolve_iface to get linktype, but resolve_iface only take effect at init python program start, so if change link type in code, resolve_iface cannot recognize the linktype realtime, suggest add conf.ifaces.reload() at the beginning of resolve_iface function:
def resolve_iface(dev, retry=True):
# type: (_GlobInterfaceType, bool) -> NetworkInterface
"""
Resolve an interface name into the interface
"""
conf.ifaces.reload()
if isinstance(dev, NetworkInterface):
return dev
try:
return conf.ifaces.dev_from_name(dev)
except ValueError:
try:
return conf.ifaces.dev_from_networkname(dev)
except ValueError:
pass
if not retry:
raise ValueError("Interface '%s' not found !" % dev)
# Nothing found yet. Reload to detect if it was added recently
conf.ifaces.reload()
return resolve_iface(dev, retry=False)Scapy version
2.6.0
Python version
3.11
Operating system
ubuntu 20.04
Additional environment information
No response
How to reproduce
from scapy.sendrecv import AsyncSniffer
import time
import subprocess
def set_link_type(mode_type):
subprocess.Popen(['sudo', 'ifconfig', 'wlan0', 'down'])
print('sudo ifconfig wlan0 down')
time.sleep(1)
if mode_type == 'managed':
subprocess.Popen(['sudo', 'iwconfig', 'wlan0', 'mode', 'managed'])
print('sudo iwconfig wlan0 mode managed')
time.sleep(1)
elif mode_type == 'monitor':
subprocess.Popen(['sudo', 'iwconfig', 'wlan0', 'mode', 'monitor'])
print('sudo iwconfig wlan0 mode monitor')
time.sleep(1)
subprocess.Popen(['sudo', 'ifconfig', 'wlan0', 'up'])
print('sudo ifconfig wlan0 up')
time.sleep(2)
def capture():
sniffer = AsyncSniffer(iface='wlan0', filter='wlan type mgt subtype deauth')
sniffer.start()
time.sleep(1)
sniffer.stop()
set_link_type('monitor')
print('link type match filter')
capture()
set_link_type('managed')
print('link type not match filter')
capture()
execute the script twice will tirgger issue
Actual result
Traceback (most recent call last):
File "/home/dinghuan/.pyenv/pyenv-1.2.19/versions/3.11.1/lib/python3.11/site-packages/scapy/sendrecv.py", line 1400, in stop
self.stop_cb()
^^^^^^^^^^^^
AttributeError: 'AsyncSniffer' object has no attribute 'stop_cb'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/dinghuan/myscript/scapy/debug_stop_cb.py", line 32, in
capture()
File "/home/dinghuan/myscript/scapy/debug_stop_cb.py", line 27, in capture
sniffer.stop()
File "/home/dinghuan/.pyenv/pyenv-1.2.19/versions/3.11.1/lib/python3.11/site-packages/scapy/sendrecv.py", line 1402, in stop
raise Scapy_Exception(
scapy.error.Scapy_Exception: Unsupported (offline or unsupported socket)
Expected result
can get right linktype after code change the linktype
Related resources
No response