diff --git a/config.c b/config.c
index 734bd36..100f033 100644
--- a/config.c
+++ b/config.c
@@ -30,12 +30,6 @@ enum config_section {
 	UNKNOWN_SECTION,
 };
 
-enum parser_result {
-	PARSED_OK,
-	NOT_PARSED,
-	BAD_VALUE,
-};
-
 static enum parser_result parse_section_line(char *s, enum config_section *section)
 {
 	if (!strcasecmp(s, "[global]")) {
@@ -512,6 +506,14 @@ int config_read(char *name, struct config *cfg)
 				fprintf(stderr, "%s is a bad value for option %s at line %d\n",
 						value, option, line_num);
 				goto parse_error;
+			case MALFORMED:
+				fprintf(stderr, "%s is a malformed value for option %s at line %d\n",
+						value, option, line_num);
+				goto parse_error;
+			case OUT_OF_RANGE:
+				fprintf(stderr, "%s is an out of range value for option %s at line %d\n",
+						value, option, line_num);
+				goto parse_error;
 			}
 
 			break;
diff --git a/config.h b/config.h
index 901b50a..d4a58b3 100644
--- a/config.h
+++ b/config.h
@@ -46,6 +46,14 @@ struct interface {
 #define CFG_IGNORE_USE_SYSLOG   (1 << 5)
 #define CFG_IGNORE_VERBOSE      (1 << 6)
 
+enum parser_result {
+	PARSED_OK,
+	NOT_PARSED,
+	BAD_VALUE,
+	MALFORMED,
+	OUT_OF_RANGE,
+};
+
 struct config {
 	/* configuration override */
 	int cfg_ignore;
diff --git a/util.c b/util.c
index 55ec49f..45cf5ba 100644
--- a/util.c
+++ b/util.c
@@ -16,7 +16,9 @@
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
+#include <errno.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include "sk.h"
@@ -190,3 +192,45 @@ int leap_second_status(uint64_t ts, int leap_set, int *leap, int *utc_offset)
 
 	return leap_status;
 }
+
+enum parser_result get_ranged_int(const char *str_val, int *result, int min, int max)
+{
+	long parsed_val;
+	char *endptr = NULL;
+	errno = 0;
+	parsed_val = strtol(str_val, &endptr, 0);
+	if (*endptr != '\0' || endptr == str_val)
+		return MALFORMED;
+	if (errno == ERANGE || parsed_val < min || parsed_val > max)
+		return OUT_OF_RANGE;
+	*result = parsed_val;
+	return PARSED_OK;
+}
+
+enum parser_result get_ranged_uint(const char *str_val, unsigned int *result, unsigned int min, unsigned int max)
+{
+	unsigned long parsed_val;
+	char *endptr = NULL;
+	errno = 0;
+	parsed_val = strtoul(str_val, &endptr, 0);
+	if (*endptr != '\0' || endptr == str_val)
+		return MALFORMED;
+	if (errno == ERANGE || parsed_val < min || parsed_val > max)
+		return OUT_OF_RANGE;
+	*result = parsed_val;
+	return PARSED_OK;
+}
+
+enum parser_result get_ranged_double(const char *str_val, double *result, double min, double max)
+{
+	double parsed_val;
+	char *endptr = NULL;
+	errno = 0;
+	parsed_val = strtod(str_val, &endptr);
+	if (*endptr != '\0' || endptr == str_val)
+		return MALFORMED;
+	if (errno == ERANGE || parsed_val < min || parsed_val > max)
+		return OUT_OF_RANGE;
+	*result = parsed_val;
+	return PARSED_OK;
+}
diff --git a/util.h b/util.h
index d2734d1..ea14d3b 100644
--- a/util.h
+++ b/util.h
@@ -20,6 +20,7 @@
 #ifndef HAVE_UTIL_H
 #define HAVE_UTIL_H
 
+#include "config.h"
 #include "ddt.h"
 
 /**
@@ -114,4 +115,49 @@ int is_utc_ambiguous(uint64_t ts);
  *                   inserted, -1 if leap second will be deleted.
  */
 int leap_second_status(uint64_t ts, int leap_set, int *leap, int *utc_offset);
+
+/**
+ * Get an integer value from string with error checking and range
+ * specification.
+ *
+ * @param str_val    String which contains an integer value.
+ * @param result     Parsed value is stored in here.
+ * @param min        Lower limit. Return OUT_OF_RANGE if parsed value
+ *                   is less than min.
+ * @param max        Upper Limit. Return OUT_OF_RANGE if parsed value
+ *                   is bigger than max.
+ * @return           PARSED_OK on success, MALFORMED if str_val is malformed,
+ *                   OUT_OF_RANGE if str_val is out of range.
+ */
+enum parser_result get_ranged_int(const char *str_val, int *result, int min, int max);
+
+/**
+ * Get an unsigned integer value from string with error checking and range
+ * specification.
+ *
+ * @param str_val    String which contains an unsigned integer value.
+ * @param result     Parsed value is stored in here.
+ * @param min        Lower limit. Return OUT_OF_RANGE if parsed value
+ *                   is less than min.
+ * @param max        Upper Limit. Return OUT_OF_RANGE if parsed value
+ *                   is bigger than max.
+ * @return           PARSED_OK on success, MALFORMED if str_val is malformed,
+ *                   OUT_OF_RANGE if str_val is out of range.
+ */
+enum parser_result get_ranged_uint(const char *str_val, unsigned int *result, unsigned int min, unsigned int max);
+
+/**
+ * Get a double value from string with error checking and range
+ * specification.
+ *
+ * @param str_val    String which contains a double value.
+ * @param result     Parsed value is stored in here.
+ * @param min        Lower limit. Return OUT_OF_RANGE if parsed value
+ *                   is less than min.
+ * @param max        Upper Limit. Return OUT_OF_RANGE if parsed value
+ *                   is bigger than max.
+ * @return           PARSED_OK on success, MALFORMED if str_val is malformed,
+ *                   OUT_OF_RANGE if str_val is out of range.
+ */
+enum parser_result get_ranged_double(const char *str_val, double *result, double min, double max);
 #endif