initialize libstrongswan in dynamic stand-alone libimcv-based libraries

src/libimcv/imcv.c

@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2011 Andreas Steffen, HSR Hochschule fuer Technik Rapperswil
+ *
+ * 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 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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.
+ */
+
+#include "imcv.h"
+
+#include "utils.h"
+#include <debug.h>
+
+#include <syslog.h>
+
+/**
+ * Reference count for IMC/IMV instances
+ */
+refcount_t ref = 0;
+
+/**
+ * Global configuration of libimcv dbg function
+ */
+static int debug_level = 3;
+static bool stderr_quiet = FALSE;
+
+/**
+ * libimvc dbg function
+ */
+static void libimcv_dbg(debug_t group, level_t level, char *fmt, ...)
+{
+	int priority = LOG_INFO;
+	char buffer[8192];
+	char *current = buffer, *next;
+	va_list args;
+
+	if (level <= debug_level)
+	{
+		if (!stderr_quiet)
+		{
+			va_start(args, fmt);
+			vfprintf(stderr, fmt, args);
+			fprintf(stderr, "\n");
+			va_end(args);
+		}
+
+		/* write in memory buffer first */
+		va_start(args, fmt);
+		vsnprintf(buffer, sizeof(buffer), fmt, args);
+		va_end(args);
+
+		/* do a syslog with every line */
+		while (current)
+		{
+			next = strchr(current, '\n');
+			if (next)
+			{
+				*(next++) = '\0';
+			}
+			syslog(priority, "%s\n", current);
+			current = next;
+		}
+	}
+}
+
+/**
+ * Described in header.
+ */
+bool libimcv_init(void)
+{
+	/* initialize libstrongswan library only once */
+	if (lib)
+	{
+		/* did main program initialize libstrongswan? */
+		if (ref == 0)
+		{
+			ref_get(&ref);
+		}
+	}
+	else
+	{
+		/* we are the first to initialize libstrongswan */
+		if (!library_init(NULL))
+		{
+			return FALSE;
+		}
+
+		if (!lib->plugins->load(lib->plugins, NULL, "random"))
+		{
+			library_deinit();
+			return FALSE;
+		}
+
+		/* enable libimcv debugging hook */
+		dbg = libimcv_dbg;
+		openlog("imcv", 0, LOG_DAEMON);
+
+		DBG1(DBG_LIB, "libimcv initialized");
+	}
+	ref_get(&ref);
+
+	return TRUE;
+}
+
+/**
+ * Described in header.
+ */
+void libimcv_deinit(void)
+{
+	if (ref_put(&ref))
+	{
+		DBG1(DBG_LIB, "libimcv terminated");
+		library_deinit();		
+	}
+}
+
+