From 72e2b31629964affae2d8b205d3ed516f998373c Mon Sep 17 00:00:00 2001
From: Jake Hillion <jake@hillion.co.uk>
Date: Sat, 21 May 2022 15:21:43 +0100
Subject: [PATCH] tcp connection listener

---
 examples/tls/main.rs   | 58 ++++++++++++++++++++++++++++++++++++++++++
 examples/tls/spec.json | 35 +++++++++++++++++++++++++
 2 files changed, 93 insertions(+)
 create mode 100644 examples/tls/main.rs
 create mode 100644 examples/tls/spec.json

diff --git a/examples/tls/main.rs b/examples/tls/main.rs
new file mode 100644
index 0000000..124bbd5
--- /dev/null
+++ b/examples/tls/main.rs
@@ -0,0 +1,58 @@
+use std::net::TcpListener;
+
+fn main() {
+    let mut args = std::env::args();
+
+    let _bin = args.next();
+    let entrypoint = args.next();
+
+    match entrypoint {
+        Some(s) => match s.as_str() {
+            "connection_listener" => connection_listener_entrypoint(),
+
+            _ => unimplemented!(),
+        },
+        None => unimplemented!(),
+    }
+}
+
+fn connection_listener_entrypoint() {
+    // imports
+    use std::os::unix::io::{FromRawFd, RawFd};
+
+    // argument parsing
+    let mut args = std::env::args();
+
+    let _bin = args.next();
+    let _entrypoint = args.next();
+
+    let tcp_listener = args.next();
+    let tcp_listener: RawFd = tcp_listener
+        .expect("tcp listener required")
+        .parse()
+        .expect("tcp listener should be a file descriptor");
+    let tcp_listener = unsafe { TcpListener::from_raw_fd(tcp_listener) };
+
+    // actual function body
+    fn connection_listener(tcp_listener: TcpListener) -> i32 {
+        println!("connection_listener entered");
+
+        // handle incoming connections
+        for stream in tcp_listener.incoming() {
+            let _stream = match stream {
+                Ok(s) => s,
+                Err(e) => {
+                    println!("connection listener: error: {}", e);
+                    return 1;
+                }
+            };
+
+            println!("received a new connection");
+        }
+
+        exitcode::OK
+    }
+
+    // run function
+    std::process::exit(connection_listener(tcp_listener));
+}
diff --git a/examples/tls/spec.json b/examples/tls/spec.json
new file mode 100644
index 0000000..c2ce4ca
--- /dev/null
+++ b/examples/tls/spec.json
@@ -0,0 +1,35 @@
+{
+    "entrypoints": {
+        "connection_listener": {
+            "args": [
+                "BinaryName",
+                "Entrypoint",
+                {
+                    "TcpListener": {
+                        "addr": "0.0.0.0:8443"
+                    }
+                }
+            ],
+            "environment": [
+                {
+                    "Filesystem": {
+                        "host_path": "/lib/x86_64-linux-gnu/libgcc_s.so.1",
+                        "environment_path": "/lib/libgcc_s.so.1"
+                    }
+                },
+                {
+                    "Filesystem": {
+                        "host_path": "/lib/x86_64-linux-gnu/libc.so.6",
+                        "environment_path": "/lib/libc.so.6"
+                    }
+                },
+                {
+                    "Filesystem": {
+                        "host_path": "/lib64/ld-linux-x86-64.so.2",
+                        "environment_path": "/lib64/ld-linux-x86-64.so.2"
+                    }
+                }
+            ]
+        }
+    }
+}
\ No newline at end of file