Struct arti_client::TorClient

pub struct TorClient<R: Runtime> { /* private fields */ }

An active client session on the Tor network.

While it’s running, it will fetch directory information, build circuits, and make connections for you.

Cloning this object makes a new reference to the same underlying handles: it’s usually better to clone the TorClient than it is to create a new one.

Implementations

impl TorClient<PreferredRuntime>

pub async fn create_bootstrapped(config: TorClientConfig) -> Result<Self>

Bootstrap a connection to the Tor network, using the provided config.

Returns a client once there is enough directory material to connect safely over the Tor network.

Consider using TorClient::builder for more fine-grained control.

Panics

If Tokio is being used (the default), panics if created outside the context of a currently running Tokio runtime. See the documentation for PreferredRuntime::current for more information.

If using async-std, either take care to ensure Arti is not compiled with Tokio support, or manually create an async-std runtime using tor_rtcompat and use it with TorClient::with_runtime.

pub fn builder() -> TorClientBuilder<PreferredRuntime>

Return a new builder for creating TorClient objects.

If you want to make a TorClient synchronously, this is what you want; call TorClientBuilder::create_unbootstrapped on the returned builder.

Panics

If Tokio is being used (the default), panics if created outside the context of a currently running Tokio runtime. See the documentation for tokio::runtime::Handle::current for more information.

If using async-std, either take care to ensure Arti is not compiled with Tokio support, or manually create an async-std runtime using tor_rtcompat and use it with TorClient::with_runtime.

impl<R: Runtime> TorClient<R>

pub fn with_runtime(runtime: R) -> TorClientBuilder<R>

Return a new builder for creating TorClient objects, with a custom provided Runtime.

See the tor_rtcompat crate for more information on custom runtimes.

pub async fn bootstrap(&self) -> Result<()>

Bootstrap a connection to the Tor network, with a client created by create_unbootstrapped.

Since cloned copies of a TorClient share internal state, you can bootstrap a client by cloning it and running this function in a background task (or similar). This function only needs to be called on one client in order to bootstrap all of its clones.

Returns once there is enough directory material to connect safely over the Tor network. If the client or one of its clones has already been bootstrapped, returns immediately with success. If a bootstrap is in progress, waits for it to finish, then retries it if it failed (returning success if it succeeded).

Bootstrap progress can be tracked by listening to the event receiver returned by bootstrap_events.

Failures

If the bootstrapping process fails, returns an error. This function can safely be called again later to attempt to bootstrap another time.

pub fn reconfigure(
    &self,
    new_config: &TorClientConfig,
    how: Reconfigure
) -> Result<()>

Change the configuration of this TorClient to new_config.

The how describes whether to perform an all-or-nothing reconfiguration: either all of the configuration changes will be applied, or none will. If you have disabled all-or-nothing changes, then only fatal errors will be reported in this function’s return value.

This function applies its changes to all TorClient instances derived from the same call to TorClient::create_*: even ones whose circuits are isolated from this handle.

Limitations

Although most options are reconfigurable, there are some whose values can’t be changed on an a running TorClient. Those options (or their sections) are explicitly documented not to be changeable.

Changing some options do not take effect immediately on all open streams and circuits, but rather affect only future streams and circuits. Those are also explicitly documented.

pub fn isolated_client(&self) -> TorClient<R>

Return a new isolated TorClient handle.

The two TorClients will share internal state and configuration, but their streams will never share circuits with one another.

Use this function when you want separate parts of your program to each have a TorClient handle, but where you don’t want their activities to be linkable to one another over the Tor network.

Calling this function is usually preferable to creating a completely separate TorClient instance, since it can share its internals with the existing TorClient.

(Connections made with clones of the returned TorClient may share circuits with each other.)

pub async fn connect<A: IntoTorAddr>(&self, target: A) -> Result<DataStream>

Launch an anonymized connection to the provided address and port over the Tor network.

Note that because Tor prefers to do DNS resolution on the remote side of the network, this function takes its address as a string:

// The most usual way to connect is via an address-port tuple.
let socket = tor_client.connect(("www.example.com", 443)).await?;

// You can also specify an address and port as a colon-separated string.
let socket = tor_client.connect("www.example.com:443").await?;

Hostnames are strongly preferred here: if this function allowed the caller here to provide an IPAddr or IpAddr or SocketAddr address, then

// BAD: We're about to leak our target address to the local resolver!
let address = "www.example.com:443".to_socket_addrs().unwrap().next().unwrap();
// 🤯 Oh no! Now any eavesdropper can tell where we're about to connect! 🤯

// Fortunately, this won't compile, since SocketAddr doesn't implement IntoTorAddr.
// let socket = tor_client.connect(address).await?;
//                                 ^^^^^^^ the trait `IntoTorAddr` is not implemented for `std::net::SocketAddr`

If you really do need to connect to an IP address rather than a hostname, and if you’re sure that the IP address came from a safe location, there are a few ways to do so.

// ⚠️This is risky code!⚠️
// (Make sure your addresses came from somewhere safe...)

// If we have a fixed address, we can just provide it as a string.
let socket = tor_client.connect("192.0.2.22:443").await?;
let socket = tor_client.connect(("192.0.2.22", 443)).await?;

// If we have a SocketAddr or an IpAddr, we can use the
// DangerouslyIntoTorAddr trait.
use arti_client::DangerouslyIntoTorAddr;
let sockaddr = SocketAddr::from(([192, 0, 2, 22], 443));
let ipaddr = IpAddr::from([192, 0, 2, 22]);
let socket = tor_client.connect(sockaddr.into_tor_addr_dangerously().unwrap()).await?;
let socket = tor_client.connect((ipaddr, 443).into_tor_addr_dangerously().unwrap()).await?;

pub async fn connect_with_prefs<A: IntoTorAddr>(
    &self,
    target: A,
    prefs: &StreamPrefs
) -> Result<DataStream>

Launch an anonymized connection to the provided address and port over the Tor network, with explicit connection preferences.

Note that because Tor prefers to do DNS resolution on the remote side of the network, this function takes its address as a string. (See TorClient::connect() for more information.)

pub fn clone_with_prefs(&self, connect_prefs: StreamPrefs) -> Self

Provides a new handle on this client, but with adjusted default preferences.

Connections made with e.g. connect on the returned handle will use connect_prefs. This is a convenience wrapper for clone and set_connect_prefs.

pub async fn resolve(&self, hostname: &str) -> Result<Vec<IpAddr>>

On success, return a list of IP addresses.

pub async fn resolve_with_prefs(
    &self,
    hostname: &str,
    prefs: &StreamPrefs
) -> Result<Vec<IpAddr>>

On success, return a list of IP addresses, but use prefs.

pub async fn resolve_ptr(&self, addr: IpAddr) -> Result<Vec<String>>

Perform a remote DNS reverse lookup with the provided IP address.

On success, return a list of hostnames.

pub async fn resolve_ptr_with_prefs(
    &self,
    addr: IpAddr,
    prefs: &StreamPrefs
) -> Result<Vec<String>>

Perform a remote DNS reverse lookup with the provided IP address.

On success, return a list of hostnames.

pub fn dirmgr(&self) -> &Arc<dyn DirProvider>

Return a reference to this this client’s directory manager.

This function is unstable. It is only enabled if the crate was built with the experimental-api feature.

pub fn circmgr(&self) -> &Arc<CircMgr<R>>

Return a reference to this this client’s circuit manager.

This function is unstable. It is only enabled if the crate was built with the experimental-api feature.

pub fn runtime(&self) -> &R

Return a reference to the runtime being used by this client.

pub fn bootstrap_status(&self) -> BootstrapStatus

Return a current status::BootstrapStatus describing how close this client is to being ready for user traffic.

pub fn bootstrap_events(&self) -> BootstrapEvents

Return a stream of status::BootstrapStatus events that will be updated whenever the client’s status changes.

The receiver might not receive every update sent to this stream, though when it does poll the stream it should get the most recent one.

pub fn set_dormant(&self, mode: DormantMode)

Change the client’s current dormant mode, putting background tasks to sleep or waking them up as appropriate.

This can be used to conserve CPU usage if you aren’t planning on using the client for a while, especially on mobile platforms.

See the DormantMode documentation for more details.

Trait Implementations

impl<R: Clone + Runtime> Clone for TorClient<R>

fn clone(&self) -> TorClient<R>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.