AsyncSniffer cannot handle interface linktype when change linktype in code

[m8k7j]

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