ipsec_types: Add utility function to parse mark_t from strings

src/libstrongswan/ipsec/ipsec_types.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012-2013 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
@@ -36,3 +36,38 @@ ENUM(ipcomp_transform_names, IPCOMP_NONE, IPCOMP_LZJH,
 	"IPCOMP_LZS",
 	"IPCOMP_LZJH"
 );
+
+/*
+ * See header
+ */
+bool mark_from_string(const char *value, mark_t *mark)
+{
+	char *endptr;
+
+	if (!value)
+	{
+		return FALSE;
+	}
+	mark->value = strtoul(value, &endptr, 0);
+	if (*endptr)
+	{
+		if (*endptr != '/')
+		{
+			DBG1(DBG_APP, "invalid mark value: %s", value);
+			return FALSE;
+		}
+		mark->mask = strtoul(endptr+1, &endptr, 0);
+		if (*endptr)
+		{
+			DBG1(DBG_LIB, "invalid mark mask: %s", endptr);
+			return FALSE;
+		}
+	}
+	else
+	{
+		mark->mask = 0xffffffff;
+	}
+	/* apply the mask to ensure the value is in range */
+	mark->value &= mark->mask;
+	return TRUE;
+}

src/libstrongswan/ipsec/ipsec_types.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012-2013 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
@@ -169,4 +169,13 @@ struct mark_t {
  */
 #define MARK_REQID (0xFFFFFFFF)
 
+/**
+ * Try to parse a mark_t from the given string of the form <mark>[/<mask>].
+ *
+ * @param value		string to parse
+ * @param mark		mark to fill
+ * @return			TRUE if parsing was successful
+ */
+bool mark_from_string(const char *value, mark_t *mark);
+
 #endif /** IPSEC_TYPES_H_ @}*/

src/libstrongswan/tests/test_utils.c

@@ -17,6 +17,7 @@
 
 #include <library.h>
 #include <utils/utils.h>
+#include <ipsec/ipsec_types.h>
 
 #include <time.h>
 
@@ -442,6 +443,50 @@ START_TEST(test_time_delta_printf_hook)
 }
 END_TEST
 
+/*******************************************************************************
+ * mark_from_string
+ */
+
+static struct {
+	char *s;
+	bool ok;
+	mark_t m;
+} mark_data[] = {
+	{NULL,			FALSE, { 0 }},
+	{"",			TRUE,  { 0, 0xffffffff }},
+	{"/",			TRUE,  { 0, 0 }},
+	{"42",			TRUE,  { 42, 0xffffffff }},
+	{"0x42",		TRUE,  { 0x42, 0xffffffff }},
+	{"x",			FALSE, { 0 }},
+	{"42/",			TRUE,  { 0, 0 }},
+	{"42/0",		TRUE,  { 0, 0 }},
+	{"42/x",		FALSE, { 0 }},
+	{"42/42",		TRUE,  { 42, 42 }},
+	{"42/0xff",		TRUE,  { 42, 0xff }},
+	{"0x42/0xff",	TRUE,  { 0x42, 0xff }},
+	{"/0xff",		TRUE,  { 0, 0xff }},
+	{"/x",			FALSE, { 0 }},
+	{"x/x",			FALSE, { 0 }},
+	{"0xffffffff/0x0000ffff",	TRUE, { 0x0000ffff, 0x0000ffff }},
+	{"0xffffffff/0xffffffff",	TRUE, { 0xffffffff, 0xffffffff }},
+};
+
+START_TEST(test_mark_from_string)
+{
+	mark_t mark;
+
+	if (mark_from_string(mark_data[_i].s, &mark))
+	{
+		ck_assert_int_eq(mark.value, mark_data[_i].m.value);
+		ck_assert_int_eq(mark.mask, mark_data[_i].m.mask);
+	}
+	else
+	{
+		ck_assert(!mark_data[_i].ok);
+	}
+}
+END_TEST
+
 Suite *utils_suite_create()
 {
 	Suite *s;
@@ -496,5 +541,9 @@ Suite *utils_suite_create()
 	tcase_add_loop_test(tc, test_time_delta_printf_hook, 0, countof(time_delta_data));
 	suite_add_tcase(s, tc);
 
+	tc = tcase_create("mark_from_string");
+	tcase_add_loop_test(tc, test_mark_from_string, 0, countof(mark_data));
+	suite_add_tcase(s, tc);
+
 	return s;
 }