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Write an example client bridge line suitable for use with the running
obfs4 server instance to "obfs4_bridgeline.txt" for the convenience of
bridge operators.
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* Unbreak inbound TYPE_PRNG_SEED processing.
* IAT obfuscation is now a per-bridge argument (iat-mode).
* 0 (default) = Disabled.
* 1 = Enabled, ScrambleSuit-style with bulk throughput optimizations.
* 2 = Paranoid, Each IAT write will send a length sampled from the
length distribution. (EXPENSIVE).
The "iat-mode" argument is mandatory on the Bridge lines, and as a
ServerTransportOption. Old statefiles will continue to load and use
the default value, edit it if your hat is made of tin foil.
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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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Changing from "drbgSeed" to "drbg-seed" to be consistent with the
ServerTransportOptions to allow for easier copy/paste.
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Golang's command line parser is slightly cumbersome to use with
subcommands, so the arguments are "obfs4-iatObufscation" and
"obfs-distBias" instead of obfsproxy style subcommands.
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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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