outbound_ports.py

# Created by Jeremy Kescher. This file is public domain. Do whatever you want with it.
# Tests TCP connections on ports in range minport - maxport.
# Odd output with Python 2 but works with both Python 2 and 3.

import socket
import sys
import os

# Adjust the min-/maxport if you only want to test for a specific range
minport = 1
maxport = 65535
maxport += 1
# Adjust this for a different output path
tmppath = os.getenv('tmp', '/tmp/') + '/'
allowpath = tmppath + "allowedports.txt"
blockpath = tmppath + "blockedports.txt"

# s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# s.settimeout(10)
# s.connect(("portquiz.net", 80))
# s.close()
# 
# s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# s.settimeout(10)
# s.connect(("file.htl-donaustadt.at", 445))
# s.close()

try:
    os.remove(allowpath)
except OSError:
    pass
try:
    os.remove(blockpath)
except OSError:
    pass

allowfile = open(allowpath, "w+")
blockfile = open(blockpath, "w+")

print (tmppath)

for port in range(minport, maxport):
        if port != 445:
                host = "portquiz.net"
        else:
                # Yup, that's my school's SMB.
                # 445 is the only port portquiz.net doesn't support.
                host = "file.htl-donaustadt.at"
        try:
                s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                # Adjust this timeout (default: 0.1 == 100ms) if you experience false negatives
                s.settimeout(0.1)
                s.connect((host, port))
                
                print("pass", port)
                
                allowfile.write(str(port) + " ")
                # Flushing buffers
                allowfile.flush()
                # Making sure the buffer actually gets written to file
                os.fsync(allowfile)
                
                s.close()
        except:
                pass;
                print("fail", port)
                
                blockfile.write(str(port) + " ")
                # Flushing buffers
                blockfile.flush()
                # Making sure the buffer actually gets written to file
                os.fsync(blockfile)

allowfile.close()
blockfile.close()