Refactor using Tauri (#278)

crates/openconnect/src/ffi/mod.rs

@@ -0,0 +1,71 @@
+use crate::Vpn;
+use log::{debug, info, trace, warn};
+use std::ffi::{c_char, c_int, c_void};
+
+#[repr(C)]
+#[derive(Debug)]
+pub(crate) struct ConnectOptions {
+  pub user_data: *mut c_void,
+
+  pub server: *const c_char,
+  pub cookie: *const c_char,
+  pub user_agent: *const c_char,
+
+  pub script: *const c_char,
+  pub os: *const c_char,
+  pub certificate: *const c_char,
+  pub servercert: *const c_char,
+}
+
+#[link(name = "vpn")]
+extern "C" {
+  #[link_name = "vpn_connect"]
+  fn vpn_connect(
+    options: *const ConnectOptions,
+    callback: extern "C" fn(i32, *mut c_void),
+  ) -> c_int;
+
+  #[link_name = "vpn_disconnect"]
+  fn vpn_disconnect();
+}
+
+pub(crate) fn connect(options: &ConnectOptions) -> i32 {
+  unsafe { vpn_connect(options, on_vpn_connected) }
+}
+
+pub(crate) fn disconnect() {
+  unsafe { vpn_disconnect() }
+}
+
+#[no_mangle]
+extern "C" fn on_vpn_connected(pipe_fd: i32, vpn: *mut c_void) {
+  let vpn = unsafe { &*(vpn as *const Vpn) };
+  vpn.on_connected(pipe_fd);
+}
+
+// Logger used in the C code.
+// level: 0 = error, 1 = info, 2 = debug, 3 = trace
+// map the error level log in openconnect to the warning level
+#[no_mangle]
+extern "C" fn vpn_log(level: i32, message: *const c_char) {
+  let message = unsafe { std::ffi::CStr::from_ptr(message) };
+  let message = message.to_str().unwrap_or("Invalid log message");
+  // Strip the trailing newline
+  let message = message.trim_end_matches('\n');
+
+  if level == 0 {
+    warn!("{}", message);
+  } else if level == 1 {
+    info!("{}", message);
+  } else if level == 2 {
+    debug!("{}", message);
+  } else if level == 3 {
+    trace!("{}", message);
+  } else {
+    warn!(
+      "Unknown log level: {}, enable DEBUG log level to see more details",
+      level
+    );
+    debug!("{}", message);
+  }
+}