Make REQUEST_AGPL messages configurable and add handler by default

This makes two changes:

* Add a field to `struct GNUNET_OS_ProjectData' containing a URL (as a string)
pointing to the source code of the application.

* If the field is not NULL, add a handler for the REQUEST_AGPL messages
sending the specified URL to the client.

The handler is added both in client-service communications (i.e. local
services that don't make requests to other peers in the network) and in
peer-peer communications (CADET.)  This way, any client (local or remote with
CADET) can request the source code location using a standardized mechanism
instead of writing ad-hoc solutions (unless the service/peer explicitly
specifies a NULL pointer.)

Signed-off-by: Christian Grothoff <christian@grothoff.org>

2 files changed, 25 insertions, 13 deletions

diff --git a/src/include/gnunet_os_lib.h b/src/include/gnunet_os_lib.h
index a6188c1ca..b583cc493 100644
--- a/src/include/gnunet_os_lib.h
+++ b/src/include/gnunet_os_lib.h
@@ -287,6 +287,14 @@ struct GNUNET_OS_ProjectData
    * If this field is NULL, the path is automatically inferred.
    */
   char *gettext_path;
+
+  /**
+   * URL pointing to the source code of the application.  Required for AGPL.
+   * Setting this to NULL disables the built-in mechanism, but you must
+   * provide it in some other way.  If non-NULL, message type 1 and 2 are
+   * reserved.
+   */
+  char *agpl_url;
 };
 
 
diff --git a/src/include/gnunet_protocols.h b/src/include/gnunet_protocols.h
index 3b05fb8bb..282bb53d1 100644
--- a/src/include/gnunet_protocols.h
+++ b/src/include/gnunet_protocols.h
@@ -50,25 +50,29 @@ extern "C" {
 #endif
 
 /*******************************************************************************
- * UTIL message types
- ******************************************************************************/
+* Deprecated
+* *****************************************************************************/
 
 /**
  * Test if service is online.
  *
  * @deprecated!
  */
-#define GNUNET_MESSAGE_TYPE_TEST 1
+#define GNUNET_MESSAGE_TYPE_TEST 0
+
+/*******************************************************************************
+* AGPL source code download
+* *****************************************************************************/
 
 /**
- * Dummy messages for testing / benchmarking.
+ * Message to request source code link.
  */
-#define GNUNET_MESSAGE_TYPE_DUMMY 2
+#define GNUNET_MESSAGE_TYPE_REQUEST_AGPL 1
 
 /**
- * Another dummy messages for testing / benchmarking.
+ * Source code link.
  */
-#define GNUNET_MESSAGE_TYPE_DUMMY2 3
+#define GNUNET_MESSAGE_TYPE_RESPONSE_AGPL 2
 
 /*******************************************************************************
  * RESOLVER message types
@@ -85,18 +89,18 @@ extern "C" {
 #define GNUNET_MESSAGE_TYPE_RESOLVER_RESPONSE 5
 
 /*******************************************************************************
-* AGPL source code download
-* *****************************************************************************/
+ * UTIL message types
+ ******************************************************************************/
 
 /**
- * Message to request source code link.
+ * Dummy messages for testing / benchmarking.
  */
-#define GNUNET_MESSAGE_TYPE_REQUEST_AGPL 6
+#define GNUNET_MESSAGE_TYPE_DUMMY 6
 
 /**
- * Source code link.
+ * Another dummy messages for testing / benchmarking.
  */
-#define GNUNET_MESSAGE_TYPE_RESPONSE_AGPL 7
+#define GNUNET_MESSAGE_TYPE_DUMMY2 7
 
 
 /*******************************************************************************