tor_proto/
lib.rs

1#![cfg_attr(docsrs, feature(doc_cfg))]
2#![doc = include_str!("../README.md")]
3// @@ begin lint list maintained by maint/add_warning @@
4#![allow(renamed_and_removed_lints)] // @@REMOVE_WHEN(ci_arti_stable)
5#![allow(unknown_lints)] // @@REMOVE_WHEN(ci_arti_nightly)
6#![warn(missing_docs)]
7#![warn(noop_method_call)]
8#![warn(unreachable_pub)]
9#![warn(clippy::all)]
10#![deny(clippy::await_holding_lock)]
11#![deny(clippy::cargo_common_metadata)]
12#![deny(clippy::cast_lossless)]
13#![deny(clippy::checked_conversions)]
14#![warn(clippy::cognitive_complexity)]
15#![deny(clippy::debug_assert_with_mut_call)]
16#![deny(clippy::exhaustive_enums)]
17#![deny(clippy::exhaustive_structs)]
18#![deny(clippy::expl_impl_clone_on_copy)]
19#![deny(clippy::fallible_impl_from)]
20#![deny(clippy::implicit_clone)]
21#![deny(clippy::large_stack_arrays)]
22#![warn(clippy::manual_ok_or)]
23#![deny(clippy::missing_docs_in_private_items)]
24#![warn(clippy::needless_borrow)]
25#![warn(clippy::needless_pass_by_value)]
26#![warn(clippy::option_option)]
27#![deny(clippy::print_stderr)]
28#![deny(clippy::print_stdout)]
29#![warn(clippy::rc_buffer)]
30#![deny(clippy::ref_option_ref)]
31#![warn(clippy::semicolon_if_nothing_returned)]
32#![warn(clippy::trait_duplication_in_bounds)]
33#![deny(clippy::unchecked_time_subtraction)]
34#![deny(clippy::unnecessary_wraps)]
35#![warn(clippy::unseparated_literal_suffix)]
36#![deny(clippy::unwrap_used)]
37#![deny(clippy::mod_module_files)]
38#![allow(clippy::let_unit_value)] // This can reasonably be done for explicitness
39#![allow(clippy::uninlined_format_args)]
40#![allow(clippy::significant_drop_in_scrutinee)] // arti/-/merge_requests/588/#note_2812945
41#![allow(clippy::result_large_err)] // temporary workaround for arti#587
42#![allow(clippy::needless_raw_string_hashes)] // complained-about code is fine, often best
43#![allow(clippy::needless_lifetimes)] // See arti#1765
44#![allow(mismatched_lifetime_syntaxes)] // temporary workaround for arti#2060
45//! <!-- @@ end lint list maintained by maint/add_warning @@ -->
46
47// TODO #2010: Remove this global allow, and either propagate it to the functions that need it,
48// or make those functions less complex.
49#![allow(clippy::cognitive_complexity)]
50// TODO #1645 (either remove this, or decide to have it everywhere)
51#![cfg_attr(
52    not(all(feature = "full", feature = "experimental")),
53    allow(unused, unreachable_pub)
54)]
55
56#[cfg(feature = "bench")]
57pub mod bench_utils;
58pub mod channel;
59pub mod circuit;
60pub mod client;
61pub(crate) mod conflux;
62mod congestion;
63mod crypto;
64pub mod memquota;
65mod stream;
66pub(crate) mod streammap;
67pub(crate) mod tunnel;
68mod util;
69
70#[cfg(feature = "relay")]
71pub mod relay;
72#[cfg(feature = "relay")]
73pub use relay::channel::{RelayChannelBuilder, RelayIdentities};
74
75pub use util::err::{Error, ResolveError};
76pub use util::skew::ClockSkew;
77
78pub use channel::params::ChannelPaddingInstructions;
79pub use client::{ClientTunnel, HopLocation, TargetHop, channel::ClientChannelBuilder};
80pub use congestion::params as ccparams;
81pub use crypto::cell::{HopNum, HopNumDisplay};
82pub use stream::flow_ctrl::params::{CellCount, FlowCtrlParameters};
83#[cfg(feature = "send-control-msg")]
84pub use {
85    crate::client::Conversation,
86    crate::client::msghandler::{MsgHandler, UserMsgHandler},
87    crate::client::reactor::MetaCellDisposition,
88};
89
90/// A Result type for this crate.
91pub type Result<T> = std::result::Result<T, Error>;
92
93use std::fmt::Debug;
94use tor_memquota::{
95    HasMemoryCost,
96    mq_queue::{self, ChannelSpec as _},
97};
98use tor_rtcompat::DynTimeProvider;
99
100#[doc(hidden)]
101pub use {derive_deftly, tor_memquota};
102
103/// Timestamp object that we update whenever we get incoming traffic.
104///
105/// Used to implement [`time_since_last_incoming_traffic`]
106static LAST_INCOMING_TRAFFIC: util::ts::AtomicOptTimestamp = util::ts::AtomicOptTimestamp::new();
107
108/// Called whenever we receive incoming traffic.
109///
110/// Used to implement [`time_since_last_incoming_traffic`]
111#[inline]
112pub(crate) fn note_incoming_traffic() {
113    LAST_INCOMING_TRAFFIC.update();
114}
115
116/// Return the amount of time since we last received "incoming traffic".
117///
118/// This is a global counter, and is subject to interference from
119/// other users of the `tor_proto`.  Its only permissible use is for
120/// checking how recently we have been definitely able to receive
121/// incoming traffic.
122///
123/// When enabled, this timestamp is updated whenever we receive a valid
124/// cell, and whenever we complete a channel handshake.
125///
126/// Returns `None` if we never received "incoming traffic".
127pub fn time_since_last_incoming_traffic() -> Option<std::time::Duration> {
128    LAST_INCOMING_TRAFFIC.time_since_update().map(Into::into)
129}
130
131/// Make an MPSC queue, of any type, that participates in memquota, but a fake one for testing
132#[cfg(any(test, feature = "testing"))] // Used by Channel::new_fake which is also feature=testing
133pub(crate) fn fake_mpsc<T: HasMemoryCost + Debug + Send>(
134    buffer: usize,
135) -> (
136    mq_queue::Sender<T, mq_queue::MpscSpec>,
137    mq_queue::Receiver<T, mq_queue::MpscSpec>,
138) {
139    mq_queue::MpscSpec::new(buffer)
140        .new_mq(
141            // The fake Account doesn't care about the data ages, so this will do.
142            //
143            // Thiw would be wrong to use generally in tests, where we might want to mock time,
144            // since we end up, here with totally *different* mocked time.
145            // But it's OK here, and saves passing a runtime parameter into this function.
146            DynTimeProvider::new(tor_rtmock::MockRuntime::default()),
147            &tor_memquota::Account::new_noop(),
148        )
149        .expect("create fake mpsc")
150}
151
152/// Return a list of the protocols [supported](tor_protover::doc_supported)
153/// by this crate, running as a client.
154pub fn supported_client_protocols() -> tor_protover::Protocols {
155    use tor_protover::named::*;
156    // WARNING: REMOVING ELEMENTS FROM THIS LIST CAN BE DANGEROUS!
157    // SEE [`tor_protover::doc_changing`]
158    let mut protocols = vec![
159        LINK_V4,
160        LINK_V5,
161        LINKAUTH_ED25519_SHA256_EXPORTER,
162        FLOWCTRL_AUTH_SENDME,
163        RELAY_NTOR,
164        RELAY_EXTEND_IPv6,
165        RELAY_NTORV3,
166        RELAY_NEGOTIATE_SUBPROTO,
167    ];
168    #[cfg(feature = "flowctl-cc")]
169    protocols.push(FLOWCTRL_CC);
170    #[cfg(feature = "counter-galois-onion")]
171    protocols.push(RELAY_CRYPT_CGO);
172
173    protocols.into_iter().collect()
174}
175
176#[cfg(test)]
177mod test {
178    // @@ begin test lint list maintained by maint/add_warning @@
179    #![allow(clippy::bool_assert_comparison)]
180    #![allow(clippy::clone_on_copy)]
181    #![allow(clippy::dbg_macro)]
182    #![allow(clippy::mixed_attributes_style)]
183    #![allow(clippy::print_stderr)]
184    #![allow(clippy::print_stdout)]
185    #![allow(clippy::single_char_pattern)]
186    #![allow(clippy::unwrap_used)]
187    #![allow(clippy::unchecked_time_subtraction)]
188    #![allow(clippy::useless_vec)]
189    #![allow(clippy::needless_pass_by_value)]
190    //! <!-- @@ end test lint list maintained by maint/add_warning @@ -->
191
192    use cfg_if::cfg_if;
193
194    use super::*;
195
196    #[test]
197    fn protocols() {
198        let pr = supported_client_protocols();
199        cfg_if! {
200            if #[cfg(all(feature="flowctl-cc", feature="counter-galois-onion"))] {
201                let expected = "FlowCtrl=1-2 Link=4-5 LinkAuth=3 Relay=2-6".parse().unwrap();
202            } else if #[cfg(feature="flowctl-cc")] {
203                let expected = "FlowCtrl=1-2 Link=4-5 LinkAuth=3 Relay=2-5".parse().unwrap();
204                // (Note that we don't have to check for cgo without cc, since that isn't possible.)
205            } else {
206                let expected = "FlowCtrl=1 Link=4-5 LinkAuth=3 Relay=2-5".parse().unwrap();
207            }
208        }
209        assert_eq!(pr, expected);
210    }
211}
tor_proto/lib.rs

tor_proto/
lib.rs
