Overlooked that mysql will attempt auth twice for any nonstandard plugin

Author: dmoagx

Frameworks/SPMySQLFramework/MySQL Client Libraries/Patches/003-callback-password-auth.diff

@@ -29,9 +29,9 @@ To apply:
 
 (patch created with `diff -Naur`)
 
-diff -Naur mysql-5.5.59-dist/include/mysql.h mysql-5.5.59/include/mysql.h
---- mysql-5.5.59-dist/include/mysql.h	2017-11-27 13:03:17.000000000 +0100
-+++ mysql-5.5.59/include/mysql.h	2018-02-14 00:28:26.000000000 +0100
+diff -Naur mysql-5.5.59-p002/include/mysql.h mysql-5.5.59-p003/include/mysql.h
+--- mysql-5.5.59-p002/include/mysql.h	2017-11-27 13:03:17.000000000 +0100
++++ mysql-5.5.59-p003/include/mysql.h	2018-02-16 00:23:19.000000000 +0100
 @@ -288,6 +288,18 @@
    /* needed for embedded server - no net buffer to store the 'info' */
    char *info_buffer;
@@ -51,9 +51,9 @@ diff -Naur mysql-5.5.59-dist/include/mysql.h mysql-5.5.59/include/mysql.h
  } MYSQL;
 
 
-diff -Naur mysql-5.5.59-dist/sql-common/client.c mysql-5.5.59/sql-common/client.c
---- mysql-5.5.59-dist/sql-common/client.c	2017-11-27 13:03:17.000000000 +0100
-+++ mysql-5.5.59/sql-common/client.c	2018-02-14 00:34:26.000000000 +0100
+diff -Naur mysql-5.5.59-p002/sql-common/client.c mysql-5.5.59-p003/sql-common/client.c
+--- mysql-5.5.59-p002/sql-common/client.c	2017-11-27 13:03:17.000000000 +0100
++++ mysql-5.5.59-p003/sql-common/client.c	2018-02-16 00:27:37.000000000 +0100
 @@ -2952,7 +2952,7 @@
    auth_plugin_t *auth_plugin;
    MCPVIO_EXT    mpvio;
@@ -94,3 +94,18 @@ diff -Naur mysql-5.5.59-dist/sql-common/client.c mysql-5.5.59/sql-common/client.
    DBUG_PRINT ("info", ("authenticate_user returned %s", 
                         res == CR_OK ? "CR_OK" : 
                         res == CR_ERROR ? "CR_ERROR" :
+@@ -3069,7 +3091,13 @@
+       DBUG_RETURN(1);
+ 
+     mpvio.plugin= auth_plugin;
+-    res= auth_plugin->authenticate_user((struct st_plugin_vio *)&mpvio, mysql);
++    res = CR_ERROR; //fallback, if block is never invoked
++    mysql->passwd_callback(mysql, auth_plugin_name, ^(const char *passwd) {
++      char *saved_passwd = mysql->passwd;
++      mysql->passwd = (char *)(passwd ? passwd : ""); // see mysql_change_user
++      res= auth_plugin->authenticate_user((struct st_plugin_vio *)&mpvio, mysql);
++      mysql->passwd = saved_passwd;
++    });
+ 
+     DBUG_PRINT ("info", ("second authenticate_user returned %s", 
+                          res == CR_OK ? "CR_OK" :