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upgrade.rs
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upgrade.rs
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// Copyright 2022 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
mod noise;
use futures::channel::oneshot;
use futures::future::Either;
use futures_timer::Delay;
use libp2p_identity as identity;
use libp2p_identity::PeerId;
use rand::distributions::Alphanumeric;
use rand::{thread_rng, Rng};
use webrtc::api::setting_engine::SettingEngine;
use webrtc::api::APIBuilder;
use webrtc::data::data_channel::DataChannel;
use webrtc::data_channel::data_channel_init::RTCDataChannelInit;
use webrtc::dtls_transport::dtls_role::DTLSRole;
use webrtc::ice::network_type::NetworkType;
use webrtc::ice::udp_mux::UDPMux;
use webrtc::ice::udp_network::UDPNetwork;
use webrtc::peer_connection::configuration::RTCConfiguration;
use webrtc::peer_connection::RTCPeerConnection;
use std::{net::SocketAddr, sync::Arc, time::Duration};
use crate::tokio::{error::Error, fingerprint::Fingerprint, sdp, substream::Substream, Connection};
/// Creates a new outbound WebRTC connection.
pub(crate) async fn outbound(
addr: SocketAddr,
config: RTCConfiguration,
udp_mux: Arc<dyn UDPMux + Send + Sync>,
client_fingerprint: Fingerprint,
server_fingerprint: Fingerprint,
id_keys: identity::Keypair,
) -> Result<(PeerId, Connection), Error> {
log::debug!("new outbound connection to {addr})");
let (peer_connection, ufrag) = new_outbound_connection(addr, config, udp_mux).await?;
let offer = peer_connection.create_offer(None).await?;
log::debug!("created SDP offer for outbound connection: {:?}", offer.sdp);
peer_connection.set_local_description(offer).await?;
let answer = sdp::answer(addr, &server_fingerprint, &ufrag);
log::debug!(
"calculated SDP answer for outbound connection: {:?}",
answer
);
peer_connection.set_remote_description(answer).await?; // This will start the gathering of ICE candidates.
let data_channel = create_substream_for_noise_handshake(&peer_connection).await?;
let peer_id = noise::outbound(
id_keys,
data_channel,
server_fingerprint,
client_fingerprint,
)
.await?;
Ok((peer_id, Connection::new(peer_connection).await))
}
/// Creates a new inbound WebRTC connection.
pub(crate) async fn inbound(
addr: SocketAddr,
config: RTCConfiguration,
udp_mux: Arc<dyn UDPMux + Send + Sync>,
server_fingerprint: Fingerprint,
remote_ufrag: String,
id_keys: identity::Keypair,
) -> Result<(PeerId, Connection), Error> {
log::debug!("new inbound connection from {addr} (ufrag: {remote_ufrag})");
let peer_connection = new_inbound_connection(addr, config, udp_mux, &remote_ufrag).await?;
let offer = sdp::offer(addr, &remote_ufrag);
log::debug!("calculated SDP offer for inbound connection: {:?}", offer);
peer_connection.set_remote_description(offer).await?;
let answer = peer_connection.create_answer(None).await?;
log::debug!("created SDP answer for inbound connection: {:?}", answer);
peer_connection.set_local_description(answer).await?; // This will start the gathering of ICE candidates.
let data_channel = create_substream_for_noise_handshake(&peer_connection).await?;
let client_fingerprint = get_remote_fingerprint(&peer_connection).await;
let peer_id = noise::inbound(
id_keys,
data_channel,
client_fingerprint,
server_fingerprint,
)
.await?;
Ok((peer_id, Connection::new(peer_connection).await))
}
async fn new_outbound_connection(
addr: SocketAddr,
config: RTCConfiguration,
udp_mux: Arc<dyn UDPMux + Send + Sync>,
) -> Result<(RTCPeerConnection, String), Error> {
let ufrag = random_ufrag();
let se = setting_engine(udp_mux, &ufrag, addr);
let connection = APIBuilder::new()
.with_setting_engine(se)
.build()
.new_peer_connection(config)
.await?;
Ok((connection, ufrag))
}
async fn new_inbound_connection(
addr: SocketAddr,
config: RTCConfiguration,
udp_mux: Arc<dyn UDPMux + Send + Sync>,
ufrag: &str,
) -> Result<RTCPeerConnection, Error> {
let mut se = setting_engine(udp_mux, ufrag, addr);
{
se.set_lite(true);
se.disable_certificate_fingerprint_verification(true);
// Act as a DTLS server (one which waits for a connection).
//
// NOTE: removing this seems to break DTLS setup (both sides send `ClientHello` messages,
// but none end up responding).
se.set_answering_dtls_role(DTLSRole::Server)?;
}
let connection = APIBuilder::new()
.with_setting_engine(se)
.build()
.new_peer_connection(config)
.await?;
Ok(connection)
}
/// Generates a random ufrag and adds a prefix according to the spec.
fn random_ufrag() -> String {
format!(
"libp2p+webrtc+v1/{}",
thread_rng()
.sample_iter(&Alphanumeric)
.take(64)
.map(char::from)
.collect::<String>()
)
}
fn setting_engine(
udp_mux: Arc<dyn UDPMux + Send + Sync>,
ufrag: &str,
addr: SocketAddr,
) -> SettingEngine {
let mut se = SettingEngine::default();
// Set both ICE user and password to our fingerprint because that's what the client is
// expecting..
se.set_ice_credentials(ufrag.to_owned(), ufrag.to_owned());
se.set_udp_network(UDPNetwork::Muxed(udp_mux.clone()));
// Allow detaching data channels.
se.detach_data_channels();
// Set the desired network type.
//
// NOTE: if not set, a [`webrtc_ice::agent::Agent`] might pick a wrong local candidate
// (e.g. IPv6 `[::1]` while dialing an IPv4 `10.11.12.13`).
let network_type = match addr {
SocketAddr::V4(_) => NetworkType::Udp4,
SocketAddr::V6(_) => NetworkType::Udp6,
};
se.set_network_types(vec![network_type]);
se
}
/// Returns the SHA-256 fingerprint of the remote.
async fn get_remote_fingerprint(conn: &RTCPeerConnection) -> Fingerprint {
let cert_bytes = conn.sctp().transport().get_remote_certificate().await;
Fingerprint::from_certificate(&cert_bytes)
}
async fn create_substream_for_noise_handshake(
conn: &RTCPeerConnection,
) -> Result<Substream, Error> {
// NOTE: the data channel w/ `negotiated` flag set to `true` MUST be created on both ends.
let data_channel = conn
.create_data_channel(
"",
Some(RTCDataChannelInit {
negotiated: Some(0), // 0 is reserved for the Noise substream
..RTCDataChannelInit::default()
}),
)
.await?;
let (tx, rx) = oneshot::channel::<Arc<DataChannel>>();
// Wait until the data channel is opened and detach it.
crate::tokio::connection::register_data_channel_open_handler(data_channel, tx).await;
let channel = match futures::future::select(rx, Delay::new(Duration::from_secs(10))).await {
Either::Left((Ok(channel), _)) => channel,
Either::Left((Err(_), _)) => {
return Err(Error::Internal("failed to open data channel".to_owned()))
}
Either::Right(((), _)) => {
return Err(Error::Internal(
"data channel opening took longer than 10 seconds (see logs)".into(),
))
}
};
let (substream, drop_listener) = Substream::new(channel);
drop(drop_listener); // Don't care about cancelled substreams during initial handshake.
Ok(substream)
}