60 lines
2.1 KiB
Markdown
60 lines
2.1 KiB
Markdown
# tor-linkspec
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`tor-linkspec`: Descriptions of Tor relays, as used to connect to them.
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## Overview
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The `tor-linkspec` crate provides traits and data structures that
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describe how to connect to Tor relays.
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When describing the location of a Tor relay on the network, the
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Tor protocol uses a set of "link specifiers", each of which
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corresponds to a single aspect of the relay's location or
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identity—such as its IP address and port, its Ed25519 identity
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key, its (legacy) RSA identity fingerprint, or so on. This
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crate's [`LinkSpec`] type encodes these structures.
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When a client is building a circuit through the Tor network, it
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needs to know certain information about the relays in that
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circuit. This crate's [`ChanTarget`] and [`CircTarget`] traits
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represent objects that describe a relay on the network that a
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client can use as the first hop, or as any hop, in a circuit.
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This crate is part of
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[Arti](https://gitlab.torproject.org/tpo/core/arti/), a project to
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implement [Tor](https://www.torproject.org/) in Rust. Several
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other crates in Arti depend on it. You will probably not need
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this crate yourself unless you are interacting with the Tor
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protocol at a fairly low level.
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`tor-linkspec` is a separate crate so that it can be used by other
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crates that expose link specifiers and by crates that consume
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them.
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### Future work
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TODO: Possibly we should rename this crate. "Linkspec" is a
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pretty esoteric term in the Tor protocols.
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TODO: Possibly the link specifiers and the `*Target` traits belong in different crates.
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## Compile-time features
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### Experimental and unstable features
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Note that the APIs enabled by these features are NOT covered by
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semantic versioning[^1] guarantees: we might break them or remove
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them between patch versions.
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* `pt-client` -- Build with enhanced data types to support pluggable
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transports.
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* `experimental` -- Build with all experimental features above.
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[^1]: Remember, semantic versioning is what makes various `cargo`
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features work reliably. To be explicit: if you want `cargo update`
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to _only_ make safe changes, then you cannot enable these
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features.
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License: MIT OR Apache-2.0
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