From: Bruce Richardson 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 Acked-by: Chengwen Feng fengchengwen@huawei.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; }