[tor-talk] SOCKS proxy to sit between user and Tor?

[Jeremy Rand]

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Hello,

I'm interested in having a SOCKS proxy sitting between the end user
and the Tor-provided SOCKS proxy, which can do really simple stuff
like redirect from one host to another.  (Just on the level of the
host requested via SOCKS, not HTTP headers.)  To implement this, I
figure surely there must be a decent SOCKS implementation I can use,
since I don't trust myself to implement the SOCKS protocol.
Unfortunately, GitHub appears to have numerous implementations of
questionable quality, and randomly searching GitHub isn't a great way
to find high-qualify code anyway.

So I'm wondering if there are any SOCKS proxy implementations that Tor
enthusiasts often use as an intermediary between a user and Tor, or
would consider suitable for such usage.  My basic requirements are:

* Reasonably well-reviewed implementation.
* Not abandoned, reasonably well maintained at least for bugfixes.
* Supports SOCKS auth in some way (I just want to pass-through the
auth to Tor for the purposes of stream isolation).
* Cross-platform (Linux/OSX/Windows).
* Generally something that Tor-interested people would expect to be
reasonably secure.

I'm not really picky about what language it's in, although a
high-level language is preferable over C/C++.  Python would be ideal,
all things being equal, but that's a very weak constraint and isn't a
big deal.

Extensibility would be a plus, i.e. if I can implement something like
redirects without modifying internal code, that would be a major benefit
.

Suggestions would be appreciated, if anyone has any.

(Apologies if some consider this off-topic.)

Thanks,
- -Jeremy
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