example/src/header_logger.c

@@ -5,6 +5,7 @@
 #include <stdlib.h>
 #include <arpa/inet.h>
 #include <string.h>
+#include <unistd.h>
 #include "servicepoint.h"
 
 #define DEFAULT_LISTEN_IP "127.0.0.1"
@@ -63,14 +64,22 @@ int main(int argc, char **argv) {
         }
 
         struct Header *header = sp_packet_get_header(packet);
+        done = header->command_code == COMMAND_CODE_HARD_RESET;
+
         ByteSlice payload = sp_packet_get_payload(packet);
         printf("Received packet: cc=%d, a=%d, b=%d, c=%d, d=%d, payload=%p (len %zu)\n",
                header->command_code, header->a, header->b, header->c, header->d,
                payload.start, payload.length);
 
-        done = header->command_code == COMMAND_CODE_HARD_RESET;
+        struct Command command = sp_cmd_generic_try_from_packet(packet);
-        sp_packet_free(packet);
+        if (command.tag == COMMAND_TAG_INVALID) {
+            printf("received invalid command\n");
+            continue;
+        }
+
+        sp_cmd_generic_free(command);
     }
 
+    close(udp_socket);
     exit(EXIT_SUCCESS);
 }

include/servicepoint.h

@@ -1564,6 +1564,8 @@ struct Command sp_cmd_generic_clone(struct Command command);
 /**
  * Deallocates an [SPCommand].
  *
+ * Commands with an invalid `tag` do not have to be freed as the `data` pointer should be null.
+ *
  * # Examples
  *
  * ```C
@@ -1588,7 +1590,7 @@ struct Packet *sp_cmd_generic_into_packet(struct Command command);
  *
  * Returns: pointer to new [SPCommand] instance or NULL if parsing failed.
  */
-struct Command *sp_cmd_generic_try_from_packet(struct Packet */*notnull*/ packet);
+struct Command sp_cmd_generic_try_from_packet(struct Packet */*notnull*/ packet);
 
 /**
  * Deallocates a [HardResetCommand].

src/commands/generic_command.rs

@@ -74,10 +74,10 @@ impl SPCommand {
 #[no_mangle]
 pub unsafe extern "C" fn sp_cmd_generic_try_from_packet(
     packet: NonNull<Packet>,
-) -> *mut SPCommand {
+) -> SPCommand {
     let packet = *unsafe { Box::from_raw(packet.as_ptr()) };
-    heap_move_ok(servicepoint::TypedCommand::try_from(packet).map(|value| {
+    servicepoint::TypedCommand::try_from(packet)
-        match value {
+        .map(|value| match value {
             TypedCommand::Clear(clear) => SPCommand {
                 tag: CommandTag::Clear,
                 data: CommandUnion {
@@ -139,8 +139,11 @@ pub unsafe extern "C" fn sp_cmd_generic_try_from_packet(
                     bitmap_legacy: heap_move_nonnull(bitmap_legacy),
                 },
             },
-        }
+        })
-    }))
+        .unwrap_or_else(move |_| SPCommand {
+            tag: CommandTag::Invalid,
+            data: CommandUnion { null: null_mut() },
+        })
 }
 
 /// Clones an [SPCommand] instance.
@@ -219,6 +222,8 @@ pub unsafe extern "C" fn sp_cmd_generic_clone(command: SPCommand) -> SPCommand {
 }
 
 /// Deallocates an [SPCommand].
+/// 
+/// Commands with an invalid `tag` do not have to be freed as the `data` pointer should be null.
 ///
 /// # Examples
 ///