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From 191d15354ba32a483fd4f8017595c7eb82ee5650 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andre=20Kl=C3=A4rner?= <kandre@ak-online.be>
Date: Fri, 29 Nov 2024 10:34:16 +0100
Subject: [PATCH] check_curl: enable internal cookie handling
This enables us to enable curl cookie engine by specifying an empty
filename as the cookie jar file.
This works, since curl's CURLOPT_COOKIEFILE option allows passing an
empty string as filename, which it interprets as a request to enable the
cookie processing. But since CURLOPT_COOKIEJAR would now attempt to
write to a file named by an empty filename, it would break again (or at
least produce a warning in verbose output).
Overall this is allows to handle checking URLs with cookie based
sessions without persisting the cookies to disk, by using the
curl-internal redirect following.
---
plugins/check_curl.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/plugins/check_curl.c
+++ b/plugins/check_curl.c
@@ -831,8 +831,11 @@
/* cookie handling */
if (cookie_jar_file != NULL) {
- handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_COOKIEJAR, cookie_jar_file), "CURLOPT_COOKIEJAR");
+ /* enable reading cookies from a file, and if the filename is an empty string, only enable the curl cookie engine */
handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_COOKIEFILE, cookie_jar_file), "CURLOPT_COOKIEFILE");
+ /* now enable saving cookies to a file, but only if the filename is not an empty string, since writing it would fail */
+ if (*cookie_jar_file)
+ handle_curl_option_return_code(curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookie_jar_file), "CURLOPT_COOKIEJAR");
}
/* do the request */
@@ -2111,6 +2114,9 @@
printf(" %s\n", "--haproxy-protocol");
printf(" %s\n", _("Send HAProxy proxy protocol v1 header (CURLOPT_HAPROXYPROTOCOL)."));
printf (" %s\n", "--cookie-jar=FILE");
+ printf (" %s\n", _("Specify an empty string as FILE to enable curl's cookie engine without saving"));
+ printf (" %s\n", _("the cookies to disk. Only enabling the engine without saving to disk requires"));
+ printf (" %s\n", _("handling multiple requests internally to curl, so use it with --onredirect=curl"));
printf (" %s\n", _("Store cookies in the cookie jar and send them out when requested."));
printf ("\n");
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