Adding d/p/19_check_curl_cookie_handling from upstream

https://patch-diff.githubusercontent.com/raw/monitoring-plugins/monitoring-plugins/pull/2052.patch

debian/patches/19_check_curl_cookie_handling

@@ -0,0 +1,46 @@
+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");
+ 

debian/patches/series

@@ -10,4 +10,5 @@
 16_check_curl_openssl_error
 17_check_fping_dontfrag_random
 18_check_curl_fix_TLS_notes
+19_check_curl_cookie_handling
 # feature patches