init

crates/vpnshare-ffi/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "vpnshare-ffi"
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+version.workspace = true
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+path = "src/lib.rs"
+
+[dependencies]
+vpnshare-core = { path = "../vpnshare-core" }
+vpnshare-proto = { path = "../vpnshare-proto" }

crates/vpnshare-ffi/src/lib.rs

@@ -0,0 +1,28 @@
+//! C ABI surface for Android and future desktop bindings.
+
+use std::os::raw::c_char;
+
+static VERSION: &[u8] = b"0.1.0\0";
+
+#[no_mangle]
+pub extern "C" fn vpnshare_core_version() -> *const c_char {
+    VERSION.as_ptr().cast()
+}
+
+#[no_mangle]
+pub extern "C" fn vpnshare_protocol_version() -> u8 {
+    vpnshare_proto::PROTOCOL_VERSION
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::ffi::CStr;
+
+    #[test]
+    fn exposes_version() {
+        let raw = vpnshare_core_version();
+        let version = unsafe { CStr::from_ptr(raw) };
+        assert_eq!(version.to_str().unwrap(), "0.1.0");
+    }
+}