Initial commit

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "agent_harness"
+version = "0.1.0"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.153"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"

Cargo.toml

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+[package]
+name = "agent_harness"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+libc = "0.2.153"

shell.nix

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+{ pkgs ? import <nixpkgs> { } }:
+with pkgs;
+let
+  agent_src = fetchgit {
+    url = "https://gitea.rixxc.de/rixxc/x25519_agent.git";
+    rev = "eafc5e9df6b316e0f9804b73e43d25f72f2c1d79";
+    hash = "sha256-PTSFEOSS3dKr6g+y2z/KN1lE5md+D25CKVmCc2YpigI=";
+  };
+
+  agent = callPackage "${agent_src}/default.nix" { };
+in
+pkgs.mkShell {
+  name = "agent-harness";
+
+  buildInputs = [ agent ];
+}

src/main.rs

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+use libc::{c_int, c_void, mmap, MAP_FAILED, MAP_SHARED, PROT_READ, PROT_WRITE};
+use std::{env, ptr};
+
+const SHARED_MEMORY_SIZE: usize = 1024;
+
+#[link(name = "agent")]
+extern "C" {
+    fn agent_start(shared_memory: *mut u8, sync_memory: *mut u8);
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+
+    let shared_fd: c_int = args[1]
+        .parse()
+        .expect("Please provide a valid file descriptor as first argument");
+
+    let sync_fd: c_int = args[2]
+        .parse()
+        .expect("Please provide a valid file descriptor as first argument");
+
+    let shared_memory = unsafe {
+        mmap(
+            ptr::null_mut() as *mut c_void,
+            SHARED_MEMORY_SIZE,
+            PROT_READ | PROT_WRITE,
+            MAP_SHARED,
+            shared_fd,
+            0,
+        )
+    } as *mut u8;
+    assert_ne!(shared_memory, MAP_FAILED as *mut u8);
+
+    let sync_memory = unsafe {
+        mmap(
+            ptr::null_mut() as *mut c_void,
+            SHARED_MEMORY_SIZE,
+            PROT_READ | PROT_WRITE,
+            MAP_SHARED,
+            sync_fd,
+            0,
+        )
+    } as *mut u8;
+    assert_ne!(sync_memory, MAP_FAILED as *mut u8);
+
+    println!("Starting agent...");
+    unsafe {
+        agent_start(shared_memory, sync_memory);
+    }
+}