compos/src/compsvc_main.rs

/*
 * 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.
 */

//! A tool to start a standalone compsvc server that serves over RPC binder.

mod artifact_signer;
mod compilation;
mod compos_key;
mod compsvc;
mod fsverity;

use android_system_virtualmachineservice::{
    aidl::android::system::virtualmachineservice::IVirtualMachineService::{
        IVirtualMachineService, VM_BINDER_SERVICE_PORT,
    },
    binder::Strong,
};
use anyhow::{bail, Context, Result};
use binder_common::{rpc_client::connect_rpc_binder, rpc_server::run_rpc_server};
use compos_common::COMPOS_VSOCK_PORT;
use log::{debug, error};
use std::panic;

/// The CID representing the host VM
const VMADDR_CID_HOST: u32 = 2;

fn main() {
    if let Err(e) = try_main() {
        error!("failed with {:?}", e);
        std::process::exit(1);
    }
}

fn try_main() -> Result<()> {
    android_logger::init_once(
        android_logger::Config::default().with_tag("compsvc").with_min_level(log::Level::Debug),
    );
    // Redirect panic messages to logcat.
    panic::set_hook(Box::new(|panic_info| {
        error!("{}", panic_info);
    }));

    let service = compsvc::new_binder()?.as_binder();
    let vm_service = get_vm_service()?;

    debug!("compsvc is starting as a rpc service.");

    let retval = run_rpc_server(service, COMPOS_VSOCK_PORT, || {
        if let Err(e) = vm_service.notifyPayloadReady() {
            error!("Unable to notify ready: {}", e);
        }
    });
    if retval {
        debug!("RPC server has shut down gracefully");
        Ok(())
    } else {
        bail!("Premature termination of RPC server");
    }
}

fn get_vm_service() -> Result<Strong<dyn IVirtualMachineService>> {
    connect_rpc_binder(VMADDR_CID_HOST, VM_BINDER_SERVICE_PORT as u32)
        .context("Connecting to IVirtualMachineService")
}