Kleine Netzwerkscripte & Tools

Python Scripte

VLAN ID aus Ethernetframe extrahieren
Beschreibung: 

 Ein kleines python Script das von einer entzwerkkarte empfangende Pakete die VLAN ID ausliste 

 Das Programm: 

 Abhängigkeiten installieren 

 apt install python3-args python3-scapy 

 Quelltext: 

 import argparse

from scapy.all import *

def extract_vlan_id(packet):

 if packet.haslayer(Dot1Q):

 vlan_id = packet[Dot1Q].vlan

 print(f"VLAN ID found: {vlan_id}")

 else:

 print("No VLAN found")

def main():

 parser = argparse.ArgumentParser(description="Extract VLAN ID from Ethernet frames.")

 parser.add_argument("-d", "--device", type=str, required=True, help="Network interface to listen on")

 args = parser.parse_args()

 print(f"Listening on interface: {args.device}")

 sniff(iface=args.device, prn=extract_vlan_id)

if __name__ == "__main__":

 main()

Python Script Portchecker
Beschreibung: Ein Script das zu einem port verbindet und schaut ober der offen ist. 

 Das Script 

 #!/usr/bin/env python3

"""

Check_MK Spoolserver Connection Test

Tests TCP connection to a Check_MK spoolserver on port 6555

"""

import socket

import sys

import time

def test_connection(host, port=6555, timeout=5):

 """

 Tests TCP connection to the specified host and port

 Args:

 host: Hostname or IP address

 port: Port number (default: 6555)

 timeout: Connection timeout in seconds (default: 5)

 Returns:

 True if connection successful, False otherwise

 """

 print(f"Testing connection to {host}:{port}...")

 print(f"Timeout: {timeout} seconds")

 print("-" * 50)

 start_time = time.time()

 try:

 # Create socket

 sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

 sock.settimeout(timeout)

 # Try to connect

 result = sock.connect_ex((host, port))

 elapsed_time = time.time() - start_time

 if result == 0:

 print(f"✓ SUCCESS: Connection established in {elapsed_time:.2f} seconds")

 print(f" Remote address: {sock.getpeername()}")

 sock.close()

 return True

 else:

 print(f"✗ FAILED: Could not connect (Error code: {result})")

 print(f" Time elapsed: {elapsed_time:.2f} seconds")

 sock.close()

 return False

 except socket.timeout:

 print(f"✗ TIMEOUT: Connection timed out after {timeout} seconds")

 return False

 except socket.gaierror as e:

 print(f"✗ DNS ERROR: Could not resolve hostname: {e}")

 return False

 except ConnectionRefusedError:

 print(f"✗ CONNECTION REFUSED: Target actively refused the connection")

 return False

 except Exception as e:

 print(f"✗ ERROR: {type(e).__name__}: {e}")

 return False

 finally:

 try:

 sock.close()

 except:

 pass

def main():

 if len(sys.argv) < 2:

 print("Usage: python3 check_spoolserver.py <hostname_or_ip> [port] [timeout]")

 print("\nExamples:")

 print(" python3 check_spoolserver.py monitoring.example.com")

 print(" python3 check_spoolserver.py 192.168.1.100")

 print(" python3 check_spoolserver.py monitoring.example.com 6555 10")

 sys.exit(1)

 host = sys.argv[1]

 port = int(sys.argv[2]) if len(sys.argv) > 2 else 6555

 timeout = int(sys.argv[3]) if len(sys.argv) > 3 else 5

 success = test_connection(host, port, timeout)

 print("-" * 50)

 if success:

 print("Result: Firewall rules appear to be correct ✓")

 sys.exit(0)

 else:

 print("Result: Connection failed - check firewall rules ✗")

 sys.exit(1)

if __name__ == "__main__":

 main()