Implement protocol module loading

3 files changed, 63 insertions, 10 deletions

diff --git a/mmss/CMakeLists.txt b/mmss/CMakeLists.txt
index b4b5829..7fcc4cb 100644
--- a/mmss/CMakeLists.txt
+++ b/mmss/CMakeLists.txt
@@ -3,6 +3,7 @@ include_directories(${GMRF_SOURCE_DIR}/include)
 add_executable(mmss
   iface.c
   mmss.c
+  protocol.c
   queue.c
 )
-target_link_libraries(mmss rt)
+target_link_libraries(mmss dl)
diff --git a/mmss/mmss.h b/mmss/mmss.h
index cabd7cd..e7f773e 100644
--- a/mmss/mmss.h
+++ b/mmss/mmss.h
@@ -28,6 +28,7 @@
 #define _GMRF_MMSS_MMSS_H_
 
 #include <gmrf/gmrf.h>
+#include <mmss/protocol.h>
 
 #include "queue.h"
 
@@ -37,15 +38,6 @@ struct mmss_context {
 	mmss_queue_t packet_queue;
 };
 
-struct gmrf_context {
-	gmrf_context_t *next;
-
-	mmss_context_t *mmss;
-	gmrf_iface_t *interfaces;
-
-	gmrf_handle_packet_func handle_packet;
-};
-
 struct mmss_network {
 	mmss_network_t *next;
 
@@ -65,6 +57,15 @@ struct mmss_packet {
 };
 
 
+struct gmrf_context {
+	gmrf_context_t *next;
+
+	mmss_context_t *mmss;
+	gmrf_iface_t *interfaces;
+
+	gmrf_handle_packet_func handle_packet;
+};
+
 struct gmrf_iface {
 	gmrf_iface_t *node_next;
 	gmrf_iface_t *network_next;
@@ -76,4 +77,6 @@ struct gmrf_iface {
 };
 
 
+const mmss_protocol_t* mmss_load_protocol(const char *module);
+
 #endif /* _GMRF_MMSS_MMSS_H_ */
diff --git a/mmss/protocol.c b/mmss/protocol.c
new file mode 100644
index 0000000..2df9809
--- /dev/null
+++ b/mmss/protocol.c
@@ -0,0 +1,49 @@
+/*
+  Copyright (c) 2013, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#include "mmss.h"
+
+#include <dlfcn.h>
+#include <stdio.h>
+
+
+const mmss_protocol_t* mmss_load_protocol(const char *module) {
+	void *handle = dlopen(module, RTLD_NOW);
+	if (!handle) {
+		fprintf(stderr, "unable to load protocol from `%s': %s\n", module, dlerror());
+		return NULL;
+	}
+
+	dlerror();
+	const mmss_protocol_t *proto = dlsym(handle, "mmss_protocol_info");
+	if (!proto) {
+		fprintf(stderr, "unable to load protocol from `%s': %s\n", module, dlerror());
+		dlclose(handle);
+		return NULL;
+	}
+
+	return proto;
+}