#tor #arti #censorship


Manage a set of pluggable transports to circumvent censorship

10 releases (4 breaking)

0.5.0 Sep 5, 2023
0.4.1 Aug 1, 2023
0.3.2 Jun 30, 2023
0.3.0 May 3, 2023
0.1.0 Oct 3, 2022

#28 in #arti

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500 downloads per month
Used in 5 crates (via arti-client)


17K SLoC


Manage a set of anti-censorship pluggable transports.


This crate is part of Arti, a project to implement Tor in Rust.

In Tor, a "transport" is a mechanism used to avoid censorship by disguising the Tor protocol as some other kind of traffic.

A "pluggable transport" is one that is not implemented by default as part of the Tor protocol, but which can instead be added later on by the packager or the user. Pluggable transports are typically provided as external binaries that implement a SOCKS proxy, along with certain other configuration protocols.

This crate provides a means to manage a set of configured pluggable transports


TODO: Currently, the APIs for this crate make it quite tor-specific. Notably, it can only return Channels! It would be good instead to adapt it so that it was more generally useful by other projects that want to use pluggable transports in rust. For now, I have put the Tor-channel-specific stuff behind a tor-channel-factory feature, but there are no APIs for using PTs without that feature currently. That should change. (See issue arti#666)

TODO: The first version of this crate will probably only conform to the original Tor pluggable transport protocol, and not to more recent variants as documented at pluggabletransports.info

Feature flags

Additive features

  • tor-channel-factory: Build with support for a ChannelFactory implementation that allows this crate's use with Tor. (Currently, this is the only way to use the crate; see "Limitations" section above.)

  • full -- Build with all the features above.

Experimental and unstable features

Note that the APIs enabled by these features are NOT covered by semantic versioning guarantees: we might break them or remove them between patch versions.

  • experimental-api -- build with experimental, unstable API support.

  • experimental -- Build with all experimental features above, along with all experimental features from other arti crates.

License: MIT OR Apache-2.0


~456K SLoC