Agent: add FFI functions for NetworkChange properties and support for Android routing

Author: HeikoBornholdt

drasyl-agent/src/agent/routing/mod.rs

@@ -38,7 +38,7 @@ cfg_if! {
         mod net_route;
         pub use net_route::AgentRouting;
     }
-    else if #[cfg(any(target_os = "ios"))] {
+    else if #[cfg(any(target_os = "ios", target_os = "android"))] {
         mod network_listener;
         pub use network_listener::AgentRouting;
     }

drasyl-agent/src/ffi.rs

@@ -622,6 +622,41 @@ pub struct NetworkChange {
     pub dns_server: *const c_char, // DNS server, NULL if not available
 }
 
+#[allow(clippy::not_unsafe_ptr_arg_deref)]
+#[unsafe(no_mangle)]
+pub extern "C" fn drasyl_agent_network_change_ips(change: *const NetworkChange) -> *const c_char {
+    if change.is_null() {
+        return std::ptr::null();
+    }
+
+    unsafe { (*change).ips }
+}
+
+#[allow(clippy::not_unsafe_ptr_arg_deref)]
+#[unsafe(no_mangle)]
+pub extern "C" fn drasyl_agent_network_change_routes(
+    change: *const NetworkChange,
+) -> *const c_char {
+    if change.is_null() {
+        return std::ptr::null();
+    }
+
+    unsafe { (*change).routes }
+}
+
+#[cfg(feature = "dns")]
+#[allow(clippy::not_unsafe_ptr_arg_deref)]
+#[unsafe(no_mangle)]
+pub extern "C" fn drasyl_agent_network_change_dns_server(
+    change: *const NetworkChange,
+) -> *const c_char {
+    if change.is_null() {
+        return std::ptr::null();
+    }
+
+    unsafe { (*change).dns_server }
+}
+
 #[allow(clippy::not_unsafe_ptr_arg_deref)]
 #[unsafe(no_mangle)]
 pub extern "C" fn drasyl_agent_start(