From: Michael Jeanson <mjeanson@efficios.com>
Date: Tue, 28 May 2024 19:08:22 +0000 (-0400)
Subject: Fix: inverted logic in loglevel_parse_range_string_common function
X-Git-Url: http://git.lttng.org./?a=commitdiff_plain;h=4b2cdabc58998834249d4c3928d23979ff071530;p=lttng-tools.git

Fix: inverted logic in loglevel_parse_range_string_common function

The mapping of numerical severity levels to their corresponding names
varies across different logging domains. Some domains, like
Java Util Logging, use higher numerical values for more severe logging
levels, while others, like Log4j2, use lower values for the same
purpose.

To accommodate this variation, the `loglevel_parse_range_string_common`
function has been updated. It now accepts the numerical value
representing the most severe logging level in a given domain. This
change ensures that log level specifications in the format `TRACE..` are
parsed correctly, regardless of the domain's convention.

Change-Id: Idbc3949ac33b69c71fce484a6d8912f59cdbe08d
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/src/bin/lttng/loglevel.cpp b/src/bin/lttng/loglevel.cpp
index de19ffed3..cd7d2d28e 100644
--- a/src/bin/lttng/loglevel.cpp
+++ b/src/bin/lttng/loglevel.cpp
@@ -163,6 +163,7 @@ end:
 static bool loglevel_parse_range_string_common(const char *str,
 					       const struct loglevel_name_value *nvs,
 					       size_t nvs_count,
+					       int default_max,
 					       int *min,
 					       int *max)
 {
@@ -170,6 +171,9 @@ static bool loglevel_parse_range_string_common(const char *str,
 	int i;
 	const struct loglevel_name_value *nv;
 
+	/*
+	 * Look for a valid loglevel name value at the beginning of 'str'.
+	 */
 	for (i = 0; i < nvs_count; i++) {
 		nv = &nvs[i];
 
@@ -178,31 +182,52 @@ static bool loglevel_parse_range_string_common(const char *str,
 		}
 	}
 
+	/*
+	 * Found no valid loglevel name value at the beginning of 'str'.
+	 */
 	if (i == nvs_count) {
 		goto error;
 	}
 
+	/*
+	 * Record the min value and skip over the loglevel name found
+	 * previously.
+	 */
 	*min = nv->value;
 	str += strlen(nv->name);
 
+	/*
+	 * If we are at the end of 'str', only one loglevel name was specified,
+	 * it is also the max.
+	 */
 	if (*str == '\0') {
 		*max = nv->value;
 		ret = true;
 		goto end;
 	}
 
+	/*
+	 * Invalid 'str', no loglevel name separator.
+	 */
 	if (strncmp(str, "..", strlen("..")) != 0) {
 		goto error;
 	}
 
 	str += strlen("..");
 
+	/*
+	 * If we are at the end of 'str' after the separator, set
+	 * the default max value for the domain as the max.
+	 */
 	if (*str == '\0') {
-		*max = LTTNG_LOGLEVEL_EMERG;
+		*max = default_max;
 		ret = true;
 		goto end;
 	}
 
+	/*
+	 * Look for a valid loglevel name value after the separator in 'str'.
+	 */
 	for (i = 0; i < nvs_count; i++) {
 		nv = &nvs[i];
 
@@ -211,10 +236,16 @@ static bool loglevel_parse_range_string_common(const char *str,
 		}
 	}
 
+	/*
+	 * Found no valid loglevel name value after the separator.
+	 */
 	if (i == nvs_count) {
 		goto error;
 	}
 
+	/*
+	 * Record the max value for the loglevel found in 'str'.
+	 */
 	*max = nv->value;
 
 	ret = true;
@@ -244,8 +275,12 @@ bool loglevel_parse_range_string(const char *str,
 				 enum lttng_loglevel *max)
 {
 	int min_int, max_int;
-	const bool ret = loglevel_parse_range_string_common(
-		str, loglevel_values, ARRAY_SIZE(loglevel_values), &min_int, &max_int);
+	const bool ret = loglevel_parse_range_string_common(str,
+							    loglevel_values,
+							    ARRAY_SIZE(loglevel_values),
+							    LTTNG_LOGLEVEL_EMERG,
+							    &min_int,
+							    &max_int);
 
 	*min = (lttng_loglevel) min_int;
 	*max = (lttng_loglevel) max_int;
@@ -271,8 +306,12 @@ bool loglevel_log4j_parse_range_string(const char *str,
 				       enum lttng_loglevel_log4j *max)
 {
 	int min_int, max_int;
-	const bool ret = loglevel_parse_range_string_common(
-		str, loglevel_log4j_values, ARRAY_SIZE(loglevel_log4j_values), &min_int, &max_int);
+	const bool ret = loglevel_parse_range_string_common(str,
+							    loglevel_log4j_values,
+							    ARRAY_SIZE(loglevel_log4j_values),
+							    LTTNG_LOGLEVEL_LOG4J_FATAL,
+							    &min_int,
+							    &max_int);
 
 	*min = (lttng_loglevel_log4j) min_int;
 	*max = (lttng_loglevel_log4j) max_int;
@@ -301,6 +340,7 @@ bool loglevel_log4j2_parse_range_string(const char *str,
 	bool ret = loglevel_parse_range_string_common(str,
 						      loglevel_log4j2_values,
 						      ARRAY_SIZE(loglevel_log4j2_values),
+						      LTTNG_LOGLEVEL_LOG4J2_FATAL,
 						      &min_int,
 						      &max_int);
 
@@ -328,8 +368,12 @@ bool loglevel_jul_parse_range_string(const char *str,
 				     enum lttng_loglevel_jul *max)
 {
 	int min_int, max_int;
-	const bool ret = loglevel_parse_range_string_common(
-		str, loglevel_jul_values, ARRAY_SIZE(loglevel_jul_values), &min_int, &max_int);
+	const bool ret = loglevel_parse_range_string_common(str,
+							    loglevel_jul_values,
+							    ARRAY_SIZE(loglevel_jul_values),
+							    LTTNG_LOGLEVEL_JUL_SEVERE,
+							    &min_int,
+							    &max_int);
 
 	*min = (lttng_loglevel_jul) min_int;
 	*max = (lttng_loglevel_jul) max_int;
@@ -358,6 +402,7 @@ bool loglevel_python_parse_range_string(const char *str,
 	const bool ret = loglevel_parse_range_string_common(str,
 							    loglevel_python_values,
 							    ARRAY_SIZE(loglevel_python_values),
+							    LTTNG_LOGLEVEL_PYTHON_CRITICAL,
 							    &min_int,
 							    &max_int);