#!/usr/bin/env python3

'''
Finder is part of https://github.com/internetwache/GitTools

Developed and maintained by @gehaxelt from @internetwache

Use at your own risk. Usage might be illegal in certain circumstances.
Only for educational purposes!
'''

import argparse
from functools import partial
from multiprocessing import Pool
from urllib.request import urlopen
from urllib.error import HTTPError, URLError
import sys


def findgitrepo(output_file, domains):
    domain = domains.strip()

    try:
        # Try to download http://target.tld/.git/HEAD
        with urlopen(''.join(['http://', domain, '/.git/HEAD']), timeout=5) as response:
            answer = response.read(200).decode('utf-8', 'ignore')

    except HTTPError:
        return
    except URLError:
        return
    except ConnectionResetError:
        return
    except (KeyboardInterrupt, SystemExit):
        raise

    # Check if refs/heads is in the file
    if 'refs/heads' not in answer:
        return

    # Write match to output_file
    with open(output_file, 'a') as file_handle:
        file_handle.write(''.join([domain, '\n']))

    print(''.join(['[*] Found: ', domain]))


def read_file(filename):
    with open(filename) as file:
        return file.readlines()

def main():
    print("""
###########
# Finder is part of https://github.com/internetwache/GitTools
#
# Developed and maintained by @gehaxelt from @internetwache
#
# Use at your own risk. Usage might be illegal in certain circumstances.
# Only for educational purposes!
###########
""")

    # Parse arguments
    parser = argparse.ArgumentParser()
    parser.add_argument('-i', '--inputfile', default='input.txt', help='input file')
    parser.add_argument('-o', '--outputfile', default='output.txt', help='output file')
    parser.add_argument('-t', '--threads', default=200, help='threads')
    args = parser.parse_args()

    domain_file = args.inputfile
    output_file = args.outputfile
    try:
        max_processes = int(args.threads)
    except ValueError as err:
        sys.exit(err)

    try:
        domains = read_file(domain_file)
    except FileNotFoundError as err:
        sys.exit(err)

    fun = partial(findgitrepo, output_file)
    print("Scanning...")
    with Pool(processes=max_processes) as pool:
        pool.map(fun, domains)
    print("Finished")

if __name__ == '__main__':
    main()

#!/usr/bin/env python3

'''
Finder is part of https://github.com/internetwache/GitTools

Developed and maintained by @gehaxelt from @internetwache

Use at your own risk. Usage might be illegal in certain circumstances.
Only for educational purposes!
'''

import argparse
from functools import partial
from multiprocessing import Pool
from urllib.request import urlopen
from urllib.error import HTTPError, URLError
import sys


def findgitrepo(output_file, domains):
    domain = domains.strip()

    try:
        # Try to download http://target.tld/.git/HEAD
        with urlopen(''.join(['http://', domain, '/.git/HEAD']), timeout=5) as response:
            answer = response.read(200).decode('utf-8', 'ignore')

    except HTTPError:
        return
    except URLError:
        return
    except OSError:
        return
    except ConnectionResetError:
        return
    except (KeyboardInterrupt, SystemExit):
        raise

    # Check if refs/heads is in the file
    if 'refs/heads' not in answer:
        return

    # Write match to output_file
    with open(output_file, 'a') as file_handle:
        file_handle.write(''.join([domain, '\n']))

    print(''.join(['[*] Found: ', domain]))


def read_file(filename):
    with open(filename) as file:
        return file.readlines()

def main():
    print("""
###########
# Finder is part of https://github.com/internetwache/GitTools
#
# Developed and maintained by @gehaxelt from @internetwache
#
# Use at your own risk. Usage might be illegal in certain circumstances.
# Only for educational purposes!
###########
""")

    # Parse arguments
    parser = argparse.ArgumentParser()
    parser.add_argument('-i', '--inputfile', default='input.txt', help='input file')
    parser.add_argument('-o', '--outputfile', default='output.txt', help='output file')
    parser.add_argument('-t', '--threads', default=200, help='threads')
    args = parser.parse_args()

    domain_file = args.inputfile
    output_file = args.outputfile
    try:
        max_processes = int(args.threads)
    except ValueError as err:
        sys.exit(err)

    try:
        domains = read_file(domain_file)
    except FileNotFoundError as err:
        sys.exit(err)

    fun = partial(findgitrepo, output_file)
    print("Scanning...")
    with Pool(processes=max_processes) as pool:
        pool.map(fun, domains)
    print("Finished")

if __name__ == '__main__':
    main()

Add OSError exception handling