Define forwarder_guest_launcher communicating with host

Bug: 340126051
Test: cargo build
Change-Id: Ic1021e89adf8b8fef1bd654d919cf444b2d259f0
diff --git a/guest/forwarder_guest_launcher/Cargo.toml b/guest/forwarder_guest_launcher/Cargo.toml
new file mode 100644
index 0000000..bf0c0ed
--- /dev/null
+++ b/guest/forwarder_guest_launcher/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "forwarder_guest_launcher"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+clap = { version = "4.5.20", features = ["derive"] }
+prost = "0.13.3"
+tokio = { version = "1.40.0", features = ["rt-multi-thread"] }
+tonic = "0.12.3"
+
+[build-dependencies]
+tonic-build = "0.12.3"
diff --git a/guest/forwarder_guest_launcher/build.rs b/guest/forwarder_guest_launcher/build.rs
new file mode 100644
index 0000000..c923747
--- /dev/null
+++ b/guest/forwarder_guest_launcher/build.rs
@@ -0,0 +1,18 @@
+// Copyright 2024 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.
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    tonic_build::compile_protos("../../libs/debian_service/proto/DebianService.proto")?;
+    Ok(())
+}
diff --git a/guest/forwarder_guest_launcher/src/main.rs b/guest/forwarder_guest_launcher/src/main.rs
new file mode 100644
index 0000000..4042fe5
--- /dev/null
+++ b/guest/forwarder_guest_launcher/src/main.rs
@@ -0,0 +1,50 @@
+// Copyright 2024 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.
+
+//! Launcher of forwarder_guest
+
+use clap::Parser;
+use debian_service::debian_service_client::DebianServiceClient;
+use debian_service::Empty;
+use tonic::transport::Endpoint;
+use tonic::Request;
+
+mod debian_service {
+    tonic::include_proto!("com.android.virtualization.vmlauncher.proto");
+}
+
+#[derive(Parser)]
+/// Flags for running command
+pub struct Args {
+    /// Host IP address
+    #[arg(long)]
+    #[arg(alias = "host")]
+    host_addr: String,
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let args = Args::parse();
+    let addr = format!("https://{}:12000", args.host_addr);
+
+    let channel = Endpoint::from_shared(addr)?.connect().await?;
+    let mut client = DebianServiceClient::new(channel);
+    let mut res_stream =
+        client.open_forwarding_request_queue(Request::new(Empty {})).await?.into_inner();
+
+    while let Some(response) = res_stream.message().await? {
+        println!("Response from the host: {:?}", response);
+    }
+    Ok(())
+}