42 lines
1.2 KiB
Python
42 lines
1.2 KiB
Python
import ipaddress
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import shutil
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import subprocess
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from typing import Optional
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def check_installed() -> bool:
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"""Check if tcpdump is installed and available on the system path."""
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return shutil.which('tcpdump') is not None
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def ensure_installed():
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"""Ensure that tcpdump is installed, raise an error if not."""
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if not check_installed():
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raise RuntimeError('tcpdump is not installed. Please install it to continue.')
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def list_interfaces(args) -> str:
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"""List available network interfaces using tcpdump."""
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ensure_installed()
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try:
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result = subprocess.run(['tcpdump', '--list-interfaces'], capture_output=True, text=True, check=True)
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print(result.stdout)
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except subprocess.CalledProcessError as e:
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print(f'Failed to list interfaces: {e}')
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return ''
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def is_valid_ipv4(ip: str) -> bool:
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try:
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ipaddress.IPv4Address(ip)
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return True
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except ValueError:
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return False
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def str_to_ipv4(ip: str) -> (bool, Optional[ipaddress]):
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try:
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address = ipaddress.IPv4Address(ip)
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return address == ipaddress.IPv4Address(ip), address
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except ipaddress.AddressValueError:
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return False, None
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