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From: Bruce Richardson <bruce.richardson@intel.com>
To: dev@dpdk.org
Cc: "Bruce Richardson" <bruce.richardson@intel.com>,
	"Ciara Power" <ciara.power@intel.com>,
	"Morten Brørup" <mb@smartsharesystems.com>
Subject: [PATCH v3 05/13] telemetry: add escaping of strings in arrays
Date: Fri,  9 Sep 2022 10:35:15 +0100	[thread overview]
Message-ID: <20220909093523.471727-6-bruce.richardson@intel.com> (raw)
In-Reply-To: <20220909093523.471727-1-bruce.richardson@intel.com>

When strings are added to an array variable, we need to properly escape
the invalid json characters in the strings.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Ciara Power <ciara.power@intel.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
---
 lib/telemetry/telemetry_json.h | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/lib/telemetry/telemetry_json.h b/lib/telemetry/telemetry_json.h
index 13df5d07e3..c4442a0bf0 100644
--- a/lib/telemetry/telemetry_json.h
+++ b/lib/telemetry/telemetry_json.h
@@ -52,17 +52,22 @@ static const char control_chars[0x20] = {
 
 /**
  * @internal
- * Does the same as __json_snprintf(buf, len, "\"%s\"", str)
- * except that it does proper escaping as necessary.
+ * This function acts the same as __json_snprintf(buf, len, "%s%s%s", prefix, str, suffix)
+ * except that it does proper escaping of "str" as necessary. Prefix and suffix should be compile-
+ * time constants not needing escaping.
  * Drops any invalid characters we don't support
  */
 static inline int
-__json_format_str(char *buf, const int len, const char *str)
+__json_format_str(char *buf, const int len, const char *prefix, const char *str, const char *suffix)
 {
 	char tmp[len];
 	int tmpidx = 0;
 
-	tmp[tmpidx++] = '"';
+	while (*prefix != '\0' && tmpidx < len)
+		tmp[tmpidx++] = *prefix++;
+	if (tmpidx >= len)
+		return 0;
+
 	while (*str != '\0') {
 		if (*str < (int)RTE_DIM(control_chars)) {
 			int idx = *str;  /* compilers don't like char type as index */
@@ -75,7 +80,7 @@ __json_format_str(char *buf, const int len, const char *str)
 			tmp[tmpidx++] = *str;
 		} else
 			tmp[tmpidx++] = *str;
-		/* we always need space for closing quote and null character.
+		/* we always need space for (at minimum) closing quote and null character.
 		 * Ensuring at least two free characters also means we can always take an
 		 * escaped character like "\n" without overflowing
 		 */
@@ -83,7 +88,12 @@ __json_format_str(char *buf, const int len, const char *str)
 			return 0;
 		str++;
 	}
-	tmp[tmpidx++] = '"';
+
+	while (*suffix != '\0' && tmpidx < len)
+		tmp[tmpidx++] = *suffix++;
+	if (tmpidx >= len)
+		return 0;
+
 	tmp[tmpidx] = '\0';
 
 	strcpy(buf, tmp);
@@ -108,7 +118,7 @@ rte_tel_json_empty_obj(char *buf, const int len, const int used)
 static inline int
 rte_tel_json_str(char *buf, const int len, const int used, const char *str)
 {
-	return used + __json_format_str(buf + used, len - used, str);
+	return used + __json_format_str(buf + used, len - used, "\"", str, "\"");
 }
 
 /* Appends a string into the JSON array in the provided buffer. */
@@ -118,9 +128,9 @@ rte_tel_json_add_array_string(char *buf, const int len, const int used,
 {
 	int ret, end = used - 1; /* strip off final delimiter */
 	if (used <= 2) /* assume empty, since minimum is '[]' */
-		return __json_snprintf(buf, len, "[\"%s\"]", str);
+		return __json_format_str(buf, len, "[\"", str, "\"]");
 
-	ret = __json_snprintf(buf + end, len - end, ",\"%s\"]", str);
+	ret = __json_format_str(buf + end, len - end, ",\"", str, "\"]");
 	return ret == 0 ? used : end + ret;
 }
 
-- 
2.34.1


  parent reply	other threads:[~2022-09-09  9:36 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-23 16:42 [RFC PATCH 0/6] add json string escaping to telemetry Bruce Richardson
2022-06-23 16:42 ` [RFC PATCH 1/6] test/telemetry_json: print success or failure per subtest Bruce Richardson
2022-06-23 16:42 ` [RFC PATCH 2/6] telemetry: fix escaping of invalid json characters Bruce Richardson
2022-06-23 18:34   ` Morten Brørup
2022-06-23 18:39     ` Stephen Hemminger
2022-06-23 18:48       ` Morten Brørup
2022-06-24  8:00         ` Bruce Richardson
2022-06-24 11:16           ` Bruce Richardson
2022-06-24 11:29             ` Morten Brørup
2022-06-24 15:06               ` Stephen Hemminger
2022-06-24  8:03     ` Bruce Richardson
2022-06-23 16:42 ` [RFC PATCH 3/6] telemetry: use json string function for string outputs Bruce Richardson
2022-06-23 16:42 ` [RFC PATCH 4/6] test/telemetry_json: add test for string character escaping Bruce Richardson
2022-06-23 16:42 ` [RFC PATCH 5/6] telemetry: add escaping of strings in arrays Bruce Richardson
2022-06-23 16:42 ` [RFC PATCH 6/6] test/telemetry-json: add test case for escaping " Bruce Richardson
2022-06-23 19:04 ` [RFC PATCH 0/6] add json string escaping to telemetry Morten Brørup
2022-06-24  8:13   ` Bruce Richardson
2022-06-24  9:12     ` Morten Brørup
2022-06-24  9:17       ` Bruce Richardson
2022-06-24 10:22         ` Morten Brørup
2022-07-14 15:42 ` Morten Brørup
2022-07-25 16:38   ` Bruce Richardson
2022-07-25 16:35 ` [PATCH v2 00/13] telemetry JSON escaping and other enhancements Bruce Richardson
2022-07-25 16:35   ` [PATCH v2 01/13] test/telemetry_json: print success or failure per subtest Bruce Richardson
2022-07-25 16:35   ` [PATCH v2 02/13] telemetry: fix escaping of invalid json characters Bruce Richardson
2022-07-26 18:25     ` Morten Brørup
2022-07-27  8:21       ` Bruce Richardson
2022-07-27  1:13     ` fengchengwen
2022-07-27  8:27       ` Bruce Richardson
2022-07-25 16:35   ` [PATCH v2 03/13] test/telemetry_json: add test for string character escaping Bruce Richardson
2022-07-25 16:35   ` [PATCH v2 04/13] telemetry: add escaping of strings in arrays Bruce Richardson
2022-07-25 16:35   ` [PATCH v2 05/13] test/telemetry-json: add test for escaping " Bruce Richardson
2022-07-25 16:35   ` [PATCH v2 06/13] telemetry: limit characters allowed in dictionary names Bruce Richardson
2022-07-25 16:35   ` [PATCH v2 07/13] telemetry: add escaping of strings in dicts Bruce Richardson
2022-07-25 16:35   ` [PATCH v2 08/13] test/telemetry_json: add test for string escaping in objects Bruce Richardson
2022-07-25 16:35   ` [PATCH v2 09/13] telemetry: limit command characters Bruce Richardson
2022-07-25 16:35   ` [PATCH v2 10/13] test/telemetry_data: refactor for maintainability Bruce Richardson
2022-08-23 12:33     ` Power, Ciara
2022-07-25 16:35   ` [PATCH v2 11/13] test/telemetry_data: add test cases for character escaping Bruce Richardson
2022-07-25 16:35   ` [PATCH v2 12/13] telemetry: eliminate duplicate code for json output Bruce Richardson
2022-07-25 16:35   ` [PATCH v2 13/13] telemetry: make help command more helpful Bruce Richardson
2022-07-26 14:36   ` [PATCH v2 00/13] telemetry JSON escaping and other enhancements Morten Brørup
2022-07-27  1:51   ` fengchengwen
2022-07-27  9:12     ` Bruce Richardson
2022-07-27  9:49       ` Morten Brørup
2022-08-23 12:35   ` Power, Ciara
2022-09-09  9:35 ` [PATCH v3 " Bruce Richardson
2022-09-09  9:35   ` [PATCH v3 01/13] telemetry: limit characters allowed in dictionary names Bruce Richardson
2022-09-09  9:35   ` [PATCH v3 02/13] test/telemetry_json: print success or failure per subtest Bruce Richardson
2022-09-09  9:35   ` [PATCH v3 03/13] telemetry: fix escaping of invalid json characters Bruce Richardson
2022-09-09  9:35   ` [PATCH v3 04/13] test/telemetry_json: add test for string character escaping Bruce Richardson
2022-09-09  9:35   ` Bruce Richardson [this message]
2022-09-09  9:35   ` [PATCH v3 06/13] test/telemetry-json: add test for escaping strings in arrays Bruce Richardson
2022-09-09  9:35   ` [PATCH v3 07/13] telemetry: add escaping of strings in dicts Bruce Richardson
2022-09-09  9:35   ` [PATCH v3 08/13] test/telemetry_json: add test for string escaping in objects Bruce Richardson
2022-09-09  9:35   ` [PATCH v3 09/13] telemetry: limit command characters Bruce Richardson
2022-09-09  9:35   ` [PATCH v3 10/13] test/telemetry_data: refactor for maintainability Bruce Richardson
2022-09-09  9:35   ` [PATCH v3 11/13] test/telemetry_data: add test cases for character escaping Bruce Richardson
2022-09-09  9:35   ` [PATCH v3 12/13] telemetry: eliminate duplicate code for json output Bruce Richardson
2022-09-09  9:35   ` [PATCH v3 13/13] telemetry: make help command more helpful Bruce Richardson
2022-09-13  0:35   ` [PATCH v3 00/13] telemetry JSON escaping and other enhancements fengchengwen
2022-09-26 11:52   ` David Marchand

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