Added plugin loader code, merely a wrapper around dlopen() and friends.

GNUmakefile

@@ -12,6 +12,7 @@ RANLIB        := ranlib
 CFLAGS        += -pipe -Wall
 USE_SSL       ?= NO
 USE_BIGENDIAN ?= AUTO
+USE_PLUGINS   ?= YES
 BITS          ?= AUTO
 SILENT        ?= YES
 TERSE         ?= NO
@@ -42,6 +43,7 @@ UHUB_PREFIX   ?= c:/uhub/
 CFLAGS        += -mno-cygwin
 LDFLAGS       += -mno-cygwin
 BIN_EXT       ?= .exe
+USE_PLUGINS   := NO
 else
 DESTDIR       ?= /
 UHUB_CONF_DIR ?= $(DESTDIR)/etc/uhub
@@ -118,6 +120,12 @@ CFLAGS        += -DSSL_SUPPORT
 LDLIBS        += -lssl
 endif
 
+ifeq ($(USE_PLUGINS),YES)
+CFLAGS        += -DPLUGIN_SUPPORT
+LDLIBS        += -ldl
+endif
+
+
 GIT_VERSION=$(shell git describe --tags 2>/dev/null || echo "")
 GIT_REVISION=$(shell git show --abbrev-commit  2>/dev/null | head -n 1 | cut -f 2 -d " " || echo "")
 OLD_REVISION=$(shell grep GIT_REVISION revision.h 2>/dev/null | cut -f 3 -d " " | tr -d "\"")
@@ -138,6 +146,7 @@ libuhub_SOURCES := \
 		src/core/route.c \
 		src/core/user.c \
 		src/core/usermanager.c \
+		src/core/pluginloader.c \
 		src/network/backend.c \
 		src/network/connection.c \
 		src/network/epoll.c \

src/core/pluginloader.c

@@ -0,0 +1,66 @@
+/*
+ * uhub - A tiny ADC p2p connection hub
+ * Copyright (C) 2007-2010, Jan Vidar Krey
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "uhub.h"
+
+#ifdef PLUGIN_SUPPORT
+
+struct uhub_plugin* uhub_plugin_open(const char* filename)
+{
+#ifdef HAVE_DLOPEN
+	struct uhub_plugin* plugin = (struct uhub_plugin*) hub_malloc_zero(sizeof(struct uhub_plugin));
+	if (!plugin)
+	{
+		return 0;
+	}
+
+	plugin->handle = dlopen(filename, RTLD_LAZY);
+
+	if (!plugin->handle)
+	{
+		LOG_ERROR("Unable to open plugin %s: %s", filename, dlerror());
+		hub_free(plugin);
+		return 0;
+	}
+
+	return plugin;
+#else
+	return 0;
+#endif
+}
+
+void uhub_plugin_close(struct uhub_plugin* plugin)
+{
+#ifdef HAVE_DLOPEN
+	dlclose(plugin->handle);
+	hub_free(plugin);
+#endif
+}
+
+void* uhub_plugin_lookup_symbol(struct uhub_plugin* plugin, const char* symbol)
+{
+#ifdef HAVE_DLOPEN
+	void* addr = dlsym(plugin->handle, symbol);
+	return addr;
+#else
+	return 0;
+#endif
+}
+
+#endif /* PLUGIN_SUPPORT */

src/core/pluginloader.h

@@ -0,0 +1,41 @@
+/*
+ * uhub - A tiny ADC p2p connection hub
+ * Copyright (C) 2007-2010, Jan Vidar Krey
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef HAVE_UHUB_PLUGIN_LOADER_H
+#define HAVE_UHUB_PLUGIN_LOADER_H
+
+#ifdef PLUGIN_SUPPORT
+
+struct uhub_plugin
+{
+#ifdef HAVE_DLOPEN
+	void* handle;
+#endif
+};
+
+extern struct uhub_plugin* uhub_plugin_open(const char* filename);
+
+extern void uhub_plugin_close(struct uhub_plugin*);
+
+extern void* uhub_plugin_lookup_symbol(struct uhub_plugin*, const char* symbol);
+
+#endif /* PLUGIN_SUPPORT */
+
+#endif /* HAVE_UHUB_PLUGIN_LOADER_H */
+

src/system.h

@@ -89,6 +89,8 @@
 #include <pwd.h>
 #include <sys/resource.h>
 #define HAVE_STRNDUP
+#define HAVE_DLOPEN
+#include <dlfcn.h>
 #ifndef __HAIKU__
 #define HAVE_MEMMEM
 #endif

src/uhub.h

@@ -84,6 +84,7 @@ extern "C" {
 #include "core/commands.h"
 #include "core/inf.h"
 #include "core/hubevent.h"
+#include "core/pluginloader.h"
 
 #ifdef __cplusplus
 }