From d6bd787123aa9ccd96edec8286ec22dd0442c620 Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Fri, 27 Oct 2017 07:58:43 -0400
Subject: [PATCH] plugins/check_mysql*.c: define our own default MySQL port.

The MYSQL_PORT constant used to be defined in mysql.h, and was used as
the default port in the two plugins check_mysql and check_mysql_query.
Now that mysql.h no longer defines that constant, our plugins fail to
build against newer versions of MySQL and MariaDB.

Since MYSQL_PORT used the "default port" on the local system, it
actually was not the best choice as the default for the check plugins:
when monitoring remote MySQL servers, the usual default of 3306 is
more likely to be correct than whatever the local server happens to be
listening on.

As a result, we fix the issue by defining our own constant, called
CHECK_PORT_DEFAULT, as "3306" at the top of both check_mysql.c and
check_mysql_query.c. The existing uses of MYSQL_PORT have been changed
to use the new CHECK_PORT_DEFAULT.

This change is backwards-incompatible: any users who compiled in a
MYSQL_PORT other than 3306 and who were running their checks on the
same server as the database will now need to specify that port
explicitly.

Closes: https://github.com/monitoring-plugins/monitoring-plugins/issues/1508
---
 plugins/check_mysql.c       | 8 ++++++--
 plugins/check_mysql_query.c | 8 ++++++--
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/plugins/check_mysql.c b/plugins/check_mysql.c
index 5773afd9..c44919d0 100644
--- a/plugins/check_mysql.c
+++ b/plugins/check_mysql.c
@@ -36,6 +36,10 @@ const char *email = "devel@monitoring-plugins.org";
 
 #define SLAVERESULTSIZE 70
 
+/* The default port that MySQL servers listen on. */
+#define CHECK_PORT_DEFAULT 3306
+
+
 #include "common.h"
 #include "utils.h"
 #include "utils_base.h"
@@ -58,7 +62,7 @@ char *ciphers = NULL;
 bool ssl = false;
 char *opt_file = NULL;
 char *opt_group = NULL;
-unsigned int db_port = MYSQL_PORT;
+unsigned int db_port = CHECK_PORT_DEFAULT;
 int check_slave = 0, warn_sec = 0, crit_sec = 0;
 int ignore_auth = 0;
 int verbose = 0;
@@ -505,7 +509,7 @@ void
 print_help (void)
 {
 	char *myport;
-	xasprintf (&myport, "%d", MYSQL_PORT);
+	xasprintf (&myport, "%d", CHECK_PORT_DEFAULT);
 
 	print_revision (progname, NP_VERSION);
 
diff --git a/plugins/check_mysql_query.c b/plugins/check_mysql_query.c
index 49a14dd3..6f492442 100644
--- a/plugins/check_mysql_query.c
+++ b/plugins/check_mysql_query.c
@@ -33,6 +33,10 @@ const char *progname = "check_mysql_query";
 const char *copyright = "1999-2007";
 const char *email = "devel@monitoring-plugins.org";
 
+/* The default port that MySQL servers listen on. */
+#define CHECK_PORT_DEFAULT 3306
+
+
 #include "common.h"
 #include "utils.h"
 #include "utils_base.h"
@@ -48,7 +52,7 @@ char *db_pass = NULL;
 char *db = NULL;
 char *opt_file = NULL;
 char *opt_group = NULL;
-unsigned int db_port = MYSQL_PORT;
+unsigned int db_port = CHECK_PORT_DEFAULT;
 
 int process_arguments (int, char **);
 int validate_arguments (void);
@@ -299,7 +303,7 @@ void
 print_help (void)
 {
 	char *myport;
-	xasprintf (&myport, "%d", MYSQL_PORT);
+	xasprintf (&myport, "%d", CHECK_PORT_DEFAULT);
 
 	print_revision (progname, NP_VERSION);
 
