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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
use crate::boot_time::{BootTime, Duration};
use anyhow::Result;
use log::error;
use tokio::runtime::{Builder, Runtime};
use tokio::sync::{mpsc, oneshot};
use tokio::task;
pub use crate::network::{ServerInfo, SocketTagger, ValidationReporter};
const MAX_BUFFERED_CMD_COUNT: usize = 400;
mod driver;
use driver::Driver;
#[derive(Eq, PartialEq, Debug)]
/// Error response to a query
pub enum QueryError {
/// Network failed probing
BrokenServer,
/// HTTP/3 connection died
ConnectionError,
/// Network not probed yet
ServerNotReady,
/// Server reset HTTP/3 stream
Reset(u64),
/// Tried to query non-existent network
Unexpected,
}
#[derive(Eq, PartialEq, Debug)]
pub enum Response {
Error { error: QueryError },
Success { answer: Vec<u8> },
}
#[derive(Debug)]
pub enum Command {
Probe {
info: ServerInfo,
timeout: Duration,
},
Query {
net_id: u32,
base64_query: String,
expired_time: BootTime,
resp: oneshot::Sender<Response>,
},
Clear {
net_id: u32,
},
Exit,
}
/// Context for a running DoH engine.
pub struct Dispatcher {
/// Used to submit cmds to the I/O task.
cmd_sender: mpsc::Sender<Command>,
join_handle: task::JoinHandle<Result<()>>,
runtime: Runtime,
}
impl Dispatcher {
const DOH_THREADS: usize = 1;
pub fn new(validation: ValidationReporter, tagger: SocketTagger) -> Result<Dispatcher> {
let (cmd_sender, cmd_receiver) = mpsc::channel::<Command>(MAX_BUFFERED_CMD_COUNT);
let runtime = Builder::new_multi_thread()
.worker_threads(Self::DOH_THREADS)
.enable_all()
.thread_name("doh-handler")
.build()?;
let join_handle = runtime.spawn(async {
let result = Driver::new(cmd_receiver, validation, tagger).drive().await;
if let Err(ref e) = result { error!("Dispatcher driver exited due to {:?}", e) }
result
});
Ok(Dispatcher { cmd_sender, join_handle, runtime })
}
pub fn send_cmd(&self, cmd: Command) -> Result<()> {
self.cmd_sender.blocking_send(cmd)?;
Ok(())
}
pub fn exit_handler(&mut self) {
if self.cmd_sender.blocking_send(Command::Exit).is_err() {
return;
}
let _ = self.runtime.block_on(&mut self.join_handle);
}
}
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