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Differences from my goptlib branch:
* Instead of exposing a net.Listener, just expose a Handshake() routine
that takes an existing net.Conn. (#14135 is irrelevant to this socks
server.
* There's an extra routine for sending back sensible errors on Dial
failure instead of "General failure".
* The code is slightly cleaner (IMO).
Gotchas:
* If the goptlib pt.Args datatype or external interface changes,
args.go will need to be updated.
Tested with obfs3 and obfs4, including IPv6.
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Unless you have very good reason to do so, there should be no reason to
actually call these ever, since the log messages are only generated if
they will result in output being written to a log file.
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Implements feature #15576.
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This allows obfs4proxy to be used as a ScrambleSuit client that is wire
compatible with the obfs4proxy implementation, including session ticket
support, and length obfuscation.
The current implementation has the following limitations:
* IAT obfuscation is not supported (and is disabled in all other
ScrambleSuit implementations by default).
* The length distribution and probabilites are different from those
generated by obfsproxy and obfsclient due to a different DRBG.
* Server support is missing and is unlikely to be implemented.
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The Go developers decided to move the go.crypto repository to
golang.org/x/crypto, and also to transition from hg to git. The tip of
tree code.google.com copy of the code is broken due to the import paths
pointing at the new repository.
While the change here is simple (just update the import location), this
affects packagers as it now expects the updated package. Sorry for the
inconveneince, I blame the Go people.
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WARNING: THIS BREAKS BACKWARD COMPATIBILITY.
This is primarily to work around bug #12930. Base16 was chosen over
unpadded Base64 because the go runtime Base64 decoder does not handle
omitting the padding.
May $deity have mercy on anyone who needs to hand-enter an obfs4 bridge
line because I will not.
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* Changed obfs4proxy to be more like obfsproxy in terms of design,
including being an easy framework for developing new TCP/IP style
pluggable transports.
* Added support for also acting as an obfs2/obfs3 client or bridge
as a transition measure (and because the code itself is trivial).
* Massively cleaned up the obfs4 and related code to be easier to
read, and more idiomatic Go-like in style.
* To ease deployment, obfs4proxy will now autogenerate the node-id,
curve25519 keypair, and drbg seed if none are specified, and save
them to a JSON file in the pt_state directory (Fixes Tor bug #12605).
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