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Christian Clauss 41702e89e6 Travis CI: Use flake8 to detect syntax errors (#1385)
* Travis CI: Use flake8 to detect syntax errors

Repeat #1305 on the Python 3 branch.  Also, remove the hardcoding of default values for dist and Py2.

https://flake8.pycqa.org/en/latest/user/error-codes.html

On the flake8 test selection, this PR does _not_ focus on "_style violations_" (the majority of flake8 error codes that [__psf/black__](https://github.com/psf/black) can autocorrect).  Instead these tests are focus on runtime safety and correctness:
* E9 tests are about Python syntax errors usually raised because flake8 can not build an Abstract Syntax Tree (AST).  Often these issues are a sign of unused code or code that has not been ported to Python 3.  These would be compile-time errors in a compiled language but in a dynamic language like Python they result in the script halting/crashing on the user.
* F63 tests are usually about the confusion between identity and equality in Python.  Use ==/!= to compare str, bytes, and int literals is the classic case.  These are areas where __a == b__ is True but __a is b__ is False (or vice versa).  Python >= 3.8 will raise SyntaxWarnings on these instances.
* F7 tests logic errors and syntax errors in type hints
* F82 tests are almost always _undefined names_ which are usually a sign of a typo, missing imports, or code that has not been ported to Python 3.  These also would be compile-time errors in a compiled language but in Python a __NameError__ is raised which will halt/crash the script on the user.

* Fail fast, exclude generated source files

* --select=E9,F63,F7

* 2to3 -f print -wn examples

* No more <> in python 3.
2019-12-09 21:58:15 +01:00

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Python

"""
A very simple port forwarder using `pwnlib.tubes.tube.connect_both()`.
"""
from pwn import *
while True:
listen(1337).wait_for_connection().connect_both(remote('google.com', 80))
# now point your browser (or curl(1)) to http://localhost:1337