BUG/MINOR: contrib/prometheus-exporter: decode parameter and value only
we were decoding all substring and then parsing; this could lead to
consider & and = in decoding result as delimiters where it should not.
this patch reverses the order by first parsing and then decoding each key
and value separately.
we also stop parsing after number sign (#).
This patch should be backported to 2.1 and 2.0
Signed-off-by: William Dauchy <w.dauchy@criteo.com>
diff --git a/contrib/prometheus-exporter/service-prometheus.c b/contrib/prometheus-exporter/service-prometheus.c
index 45a4b7a..0f178eb 100644
--- a/contrib/prometheus-exporter/service-prometheus.c
+++ b/contrib/prometheus-exporter/service-prometheus.c
@@ -2220,7 +2220,8 @@
struct channel *res = si_ic(si);
struct htx *req_htx, *res_htx;
struct htx_sl *sl;
- const char *p, *end;
+ char *p, *key, *value;
+ const char *end;
struct buffer *err;
int default_scopes = PROMEX_FL_SCOPE_ALL;
int len;
@@ -2234,57 +2235,72 @@
if (!p)
goto end;
end = HTX_SL_REQ_UPTR(sl) + HTX_SL_REQ_ULEN(sl);
- len = end-p;
- /* Decode the query-string */
+ /* copy the query-string */
+ len = end - p;
chunk_reset(&trash);
memcpy(trash.area, p, len);
trash.area[len] = 0;
- len = url_decode(trash.area);
- if (len == -1)
- goto error;
p = trash.area;
- end = p + len;
+ end = trash.area + len;
/* Parse the query-string */
- while (p < end) {
- if (*p == '&')
+ while (p < end && *p && *p != '#') {
+ value = NULL;
+
+ /* decode parameter name */
+ key = p;
+ while (p < end && *p != '=' && *p != '&' && *p != '#')
++p;
- else if (*p == 's' && (end-p) >= 6 && !memcmp(p, "scope=", 6)) {
- default_scopes = 0; /* at least a scope defined, unset default scopes */
- p += 6; /* now p point on the parameter value */
- len = 0; /* len is the value length */
- while ((p+len) < end && *(p+len) != '&')
- ++len;
+ /* found a value */
+ if (*p == '=') {
+ *(p++) = 0;
+ value = p;
+ }
+ else if (*p == '&')
+ *(p++) = 0;
+ else if (*p == '#')
+ *p = 0;
+ len = url_decode(key);
+ if (len == -1)
+ goto error;
- if (len == 0)
+ /* decode value */
+ if (value) {
+ while (p < end && *p != '=' && *p != '&' && *p != '#')
+ ++p;
+ if (*p == '=')
+ goto error;
+ if (*p == '&')
+ *(p++) = 0;
+ else if (*p == '#')
+ *p = 0;
+ len = url_decode(value);
+ if (len == -1)
+ goto error;
+ }
+
+ if (!strcmp(key, "scope")) {
+ default_scopes = 0; /* at least a scope defined, unset default scopes */
+ if (!value)
+ goto error;
+ else if (*value == 0)
appctx->ctx.stats.flags &= ~PROMEX_FL_SCOPE_ALL;
- else if (len == 1 && *p == '*')
+ else if (*value == '*')
appctx->ctx.stats.flags |= PROMEX_FL_SCOPE_ALL;
- else if (len == 6) {
- if (!memcmp(p, "global", len))
- appctx->ctx.stats.flags |= PROMEX_FL_SCOPE_GLOBAL;
- else if (!memcmp(p, "server", len))
- appctx->ctx.stats.flags |= PROMEX_FL_SCOPE_SERVER;
- }
- else if (len == 7 && !memcmp(p, "backend", len))
+ else if (!strcmp(value, "global"))
+ appctx->ctx.stats.flags |= PROMEX_FL_SCOPE_GLOBAL;
+ else if (!strcmp(value, "server"))
+ appctx->ctx.stats.flags |= PROMEX_FL_SCOPE_SERVER;
+ else if (!strcmp(value, "backend"))
appctx->ctx.stats.flags |= PROMEX_FL_SCOPE_BACK;
- else if (len == 8 && !memcmp(p, "frontend", len))
+ else if (!strcmp(value, "frontend"))
appctx->ctx.stats.flags |= PROMEX_FL_SCOPE_FRONT;
else
goto error;
-
- p += len;
}
- else if (*p == 'n' && (end-p) >= 8 && !memcmp(p, "no-maint", 8)) {
+ else if (!strcmp(key, "no-maint"))
appctx->ctx.stats.flags |= PROMEX_FL_NO_MAINT_SRV;
- p += 8;
- }
- else {
- /* ignore all other params for now */
- while (p < end && *p != '&')
- p++;
- }
}
end: