backtrace->contains_function takes multiple names, speeding up whitelist check drastically

src/libstrongswan/utils/backtrace.c

@@ -132,10 +132,11 @@ static void log_(private_backtrace_t *this, FILE *file, bool detailed)
 /**
  * Implementation of backtrace_t.contains_function
  */
-static bool contains_function(private_backtrace_t *this, char *function)
+static bool contains_function(private_backtrace_t *this,
+							  char *function[], int count)
 {
 #ifdef HAVE_DLADDR
-	int i;
+	int i, j;
 
 	for (i = 0; i< this->frame_count; i++)
 	{
@@ -143,9 +144,12 @@ static bool contains_function(private_backtrace_t *this, char *function)
 
 		if (dladdr(this->frames[i], &info) && info.dli_sname)
 		{
-			if (streq(info.dli_sname, function))
+			for (j = 0; j < count; j++)
 			{
-				return TRUE;
+				if (streq(info.dli_sname, function[j]))
+				{
+					return TRUE;
+				}
 			}
 		}
 	}
@@ -179,7 +183,7 @@ backtrace_t *backtrace_create(int skip)
 	this->frame_count = frame_count;
 
 	this->public.log = (void(*)(backtrace_t*,FILE*,bool))log_;
-	this->public.contains_function = (bool(*)(backtrace_t*, char *function))contains_function;
+	this->public.contains_function = (bool(*)(backtrace_t*, char *function[], int count))contains_function;
 	this->public.destroy = (void(*)(backtrace_t*))destroy;
 
 	return &this->public;

src/libstrongswan/utils/backtrace.h

@@ -41,12 +41,13 @@ struct backtrace_t {
 	void (*log)(backtrace_t *this, FILE *file, bool detailed);
 
 	/**
-	 * Check if the backtrace contains a frame in a specific function.
+	 * Check if the backtrace contains a frame having a function in a list.
 	 *
-	 * @param		function name
-	 * @return		TRUE if function is in the stack
+	 * @param		function name array
+	 * @param		number of elements in function array
+	 * @return		TRUE if one of the functions is in the stack
 	 */
-	bool (*contains_function)(backtrace_t *this, char *function);
+	bool (*contains_function)(backtrace_t *this, char *function[], int count);
 
 	/**
 	 * Destroy a backtrace instance.

src/libstrongswan/utils/leak_detective.c

@@ -232,22 +232,6 @@ char *whitelist[] = {
 	"gpg_err_init",
 };
 
-/**
- * check if a stack frame contains functions listed above
- */
-static bool is_whitelisted(backtrace_t *backtrace)
-{
-	int i;
-	for (i = 0; i < sizeof(whitelist)/sizeof(char*); i++)
-	{
-		if (backtrace->contains_function(backtrace, whitelist[i]))
-		{
-			return TRUE;
-		}
-	}
-	return FALSE;
-}
-
 /**
  * Report leaks at library destruction
  */
@@ -260,7 +244,8 @@ static void report(private_leak_detective_t *this, bool detailed)
 
 		for (hdr = first_header.next; hdr != NULL; hdr = hdr->next)
 		{
-			if (is_whitelisted(hdr->backtrace))
+			if (hdr->backtrace->contains_function(hdr->backtrace,
+											whitelist, countof(whitelist)))
 			{
 				whitelisted++;
 			}