check_mysql: handle ER_ACCESS_DENIED_NO_PASSWORD_ERROR if ignore_auth=1

In some situations MySQL might return ER_ACCESS_DENIED_NO_PASSWORD_ERROR
instead of ER_ACCESS_DENIED_ERROR. Semantically these errors are the same.

1 files changed, 4 insertions, 1 deletions

diff --git a/plugins/check_mysql.c b/plugins/check_mysql.c
index 6cfa70ed..91e150fb 100644
--- a/plugins/check_mysql.c
+++ b/plugins/check_mysql.c
@@ -138,7 +138,10 @@ main (int argc, char **argv)
                 mysql_ssl_set(&mysql,key,cert,ca_cert,ca_dir,ciphers);
         /* establish a connection to the server and error checking */
         if (!mysql_real_connect(&mysql,db_host,db_user,db_pass,db,db_port,db_socket,0)) {
-                if (ignore_auth && mysql_errno (&mysql) == ER_ACCESS_DENIED_ERROR)
+                /* Depending on internally-selected auth plugin MySQL might return */
+                /* ER_ACCESS_DENIED_NO_PASSWORD_ERROR or ER_ACCESS_DENIED_ERROR. */
+                /* Semantically these errors are the same. */
+                if (ignore_auth && (mysql_errno (&mysql) == ER_ACCESS_DENIED_ERROR || mysql_errno (&mysql) == ER_ACCESS_DENIED_NO_PASSWORD_ERROR))
                 {
                         printf("MySQL OK - Version: %s (protocol %d)\n",
                                 mysql_get_server_info(&mysql),