initial hack

.gitignore

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+dist/
+build/
+*.egg*
+*.pyc
+__pycache__
+.cache/
+*.swp
+.tox/
+.idea/

README.rst

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+===========
+Local CNAME
+===========
+
+.. image:: https://img.shields.io/pypi/v/local-cname.svg
+ :target: https://pypi.python.org/pypi/local-cname
+ :alt: Latest Version
+
+.. image:: https://img.shields.io/pypi/status/local-cname.svg
+ :target: https://pypi.python.org/pypi/local-cname
+ :alt: Development Status
+
+.. image:: https://img.shields.io/pypi/pyversions/local-cname.svg
+ :target: https://pypi.python.org/pypi/local-cname
+ :alt: Python Versions
+
+.. image:: https://img.shields.io/pypi/l/local-cname.svg
+ :target: https://github.com/hjacobs/local-cname/blob/master/LICENSE
+ :alt: License
+
+Installation:
+
+.. code-block::
+
+ $ sudo pip install -U local-cname
+
+Usage:
+
+.. code-block::
+
+ $ sudo local-cname FROM_DNS_NAME TO_DNS_NAME
+
+Example:
+
+.. code-block::
+
+ $ sudo local-cname google.com duckduckgo.com
+ $ ping google.com
+
+

local_cname/__main__.py

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+from local_cname.cli import main
+
+main()

local_cname/cli.py

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+import argparse
+import socket
+import time
+from pathlib import Path
+
+from clickclick import Action, info
+
+
+def main():
+ parser = argparse.ArgumentParser()
+ parser.add_argument('from')
+ parser.add_argument('to')
+ args = parser.parse_args()
+
+ hosts_file = Path('/etc/hosts')
+
+ with hosts_file.open() as fd:
+ old_contents = fd.read()
+
+ backup_file = hosts_file.with_suffix('.local-cname-backup')
+ with backup_file.open('w') as fd:
+ fd.write(old_contents)
+
+ try:
+ while True:
+ entries = []
+
+ with Action('Resolving {} ..'.format(args.to)):
+ results = socket.getaddrinfo(args.to, 80, type=socket.SOCK_STREAM)
+ for result in results:
+ family, type, proto, canonname, sockaddr = result
+ if family in (socket.AF_INET, socket.AF_INET6):
+ ip = sockaddr[0]
+ entries.append((getattr(args, 'from'), ip))
+
+ info('Current entries:')
+ for hostname, ip in entries:
+ info('{} -> {}'.format(hostname, ip))
+
+ with Action('Writing {} ..'.format(hosts_file)):
+ with hosts_file.open('w') as fd:
+ fd.write(old_contents)
+ fd.write('#### Start of entries generated by local-cname\n')
+ for hostname, ip in entries:
+ fd.write('{} {}\n'.format(ip, hostname))
+
+ time.sleep(60)
+ except KeyboardInterrupt:
+ # ignore, do not print stacktrace
+ pass
+ finally:
+ backup_file.rename(hosts_file)

setup.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from setuptools import find_packages, setup
+
+
+def readme():
+ try:
+ return open('README.rst', encoding='utf-8').read()
+ except TypeError:
+ return open('README.rst').read()
+
+
+setup(
+ name='local-cname',
+ packages=find_packages(),
+ version='0.2',
+ description='Local CNAME: ',
+ long_description=readme(),
+ author='[email protected]',
+ url='https://github.com/hjacobs/local-cname',
+ keywords='dns hosts local',
+ license='GNU General Public License v3 (GPLv3)',
+ setup_requires=['flake8'],
+ install_requires=['clickclick'],
+ tests_require=[],
+ classifiers=[
+ 'Programming Language :: Python',
+ 'Programming Language :: Python :: 3.4',
+ 'Programming Language :: Python :: 3.5',
+ 'Intended Audience :: Developers',
+ 'Operating System :: OS Independent',
+ ],
+ entry_points={'console_scripts': ['local-cname = local_cname.cli:main']}
+)