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Updated the HTML manual for the MySQL UDF and consequently other files. Thanks Roland!

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This commit is contained in:
Bernardo Damele 2009-01-22 21:28:56 +00:00
parent 69204afe1f
commit d54a51a328
4 changed files with 229 additions and 37 deletions
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72
extra/mysqludfsys/lib_mysqludf_sys/lib_mysqludf_sys.html
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@ -23,7 +23,8 @@
This library <code>lib_mysqludf_sys</code> contains a number of functions that allows one to interact with the operating system.
</p>
<ol>
<li><a href="#sys_exec"><code>sys_exec</code></a> - executes an arbitrary command, and can thus be used to launch an external application.</li>
<li><a href="#sys_eval"><code>sys_eval</code></a> - executes an arbitrary command, and returns it's output.</li>
<li><a href="#sys_exec"><code>sys_exec</code></a> - executes an arbitrary command, and returns it's exit code.</li>
<li><a href="#sys_get"><code>sys_get</code></a> - gets the value of an environment variable.</li>
<li><a href="#sys_set"><code>sys_set</code></a> - create an environment variable, or update the value of an existing environment variable.</li>
</ol>
@ -31,6 +32,72 @@
Use <a href="#lib_mysqludf_sys_info"><code>lib_mysqludf_sys_info()</code></a> to obtain information about the currently installed version of <code>lib_mysqludf_sys</code>.
</p>
<a name="sys_eval"></a><h2>sys_eval</h2>
<p>
<code>sys_eval</code> takes one command string argument and executes it, returning its output.
</p>
<h3>Syntax</h3>
<pre>sys_eval(<b>arg1</b>)</pre>
<h3>Parameters and Return Values</h3>
<dl>
<dt><code><b>arg1</b></code></dt>
<dd>
A command string valid for the current operating system or execution environment.
</dd>
<dt>returns</dt>
<dd>
Whatever output the command pushed to the standard output stream.
</dd>
</dl>
<h3>Installation</h3>
<p>
Place the shared library binary in an appropriate location.
Log in to mysql as root or as another user with sufficient privileges, and select any database.
Then, create the function using the following DDL statement:
</p>
<pre>
CREATE FUNCTION sys_eval RETURNS STRING SONAME 'lib_mysqludf_sys.so';
</pre>
<p>
The function will be globally available in all databases.
</p>
<p>
The deinstall the function, run the following statement:
</p>
<pre>
DROP FUNCTION sys_eval;
</pre>
<h3>Examples</h3>
<p>
None yet
</p>
<h3>A Note of Caution</h3>
<p>
Be very careful in deciding whether you need this function.
UDFs are available to all database users - you cannot grant EXECUTE privileges for them.
As the commandstring passed to <code>sys_exec</code> can do pretty much everything,
exposing the function poses a very real security hazard.
</p>
<p>
Even for a benign user, it is possible to accidentally do a lot of damage with it.
The call will be executed with the privileges of the os user that runs MySQL,
so it is entirely feasible to delete MySQL's data directory, or worse.
</p>
<p>
The function is intended for specialized MySQL applications where one needs extended
control over the operating system.
Currently, we do not have UDF's for ftp, email and http,
and this function can be used to implement such functionality in case it is really necessary
(datawarehouse staging areas could be a case in example).
</p>
<p>
You have been warned! If you don't see the hazard, please don't try to find it; just trust me on this.
</p>
<p>
If you do decide to use this library in a production environment, make sure that only specific commands can be run and file access is limited by using <a href="http://www.novell.com/documentation/apparmor/index.html">AppArmor</a>.
</p>
<a name="sys_exec"></a><h2>sys_exec</h2>
<p>
<code>sys_exec</code> takes one command string argument and executes it.
@ -92,6 +159,9 @@ DROP FUNCTION sys_exec;
<p>
You have been warned! If you don't see the hazard, please don't try to find it; just trust me on this.
</p>
<p>
If you do decide to use this library in a production environment, make sure that only specific commands can be run and file access is limited by using <a href="http://www.novell.com/documentation/apparmor/index.html">AppArmor</a>.
</p>
<a name="sys_get"></a><h2>sys_get</h2>
<p>
<code>sys_get</code> takes the name of an environment variable and returns the value of the variable.

2
extra/mysqludfsys/lib_mysqludf_sys/lib_mysqludf_sys.sql
View File

@ -3,7 +3,7 @@
Copyright (C) 2007 Roland Bouman
Copyright (C) 2008-2009 Roland Bouman and Bernardo Damele A. G.
web: http://www.mysqludf.org/
email: mysqludfs@gmail.com, bernardo.damele@gmail.com
email: roland.bouman@gmail.com, bernardo.damele@gmail.com
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public

150
extra/mysqludfsys/lib_mysqludf_sys_0.0.3.patch
View File

@ -47,7 +47,7 @@ diff -uN lib_mysqludf_sys_0.0.2/install.sh lib_mysqludf_sys/install.sh
+fi
Binary files lib_mysqludf_sys_0.0.2/lib_mysqludf_sys_0.0.2.tar.gz and lib_mysqludf_sys/lib_mysqludf_sys_0.0.2.tar.gz differ
diff -uN lib_mysqludf_sys_0.0.2/lib_mysqludf_sys.c lib_mysqludf_sys/lib_mysqludf_sys.c
--- lib_mysqludf_sys_0.0.2/lib_mysqludf_sys.c 2009-01-21 20:52:54.000000000 +0000
--- lib_mysqludf_sys_0.0.2/lib_mysqludf_sys.c 2009-01-22 12:01:55.000000000 +0000
+++ lib_mysqludf_sys/lib_mysqludf_sys.c 2009-01-21 00:06:13.000000000 +0000
@@ -1,8 +1,9 @@
/*
@ -177,24 +177,146 @@ diff -uN lib_mysqludf_sys_0.0.2/lib_mysqludf_sys.c lib_mysqludf_sys/lib_mysqludf
+
#endif /* HAVE_DLOPEN */
diff -uN lib_mysqludf_sys_0.0.2/lib_mysqludf_sys.html lib_mysqludf_sys/lib_mysqludf_sys.html
--- lib_mysqludf_sys_0.0.2/lib_mysqludf_sys.html 2009-01-22 12:01:55.000000000 +0000
+++ lib_mysqludf_sys/lib_mysqludf_sys.html 2009-01-22 10:21:46.000000000 +0000
@@ -23,7 +23,8 @@
This library <code>lib_mysqludf_sys</code> contains a number of functions that allows one to interact with the operating system.
</p>
<ol>
- <li><a href="#sys_exec"><code>sys_exec</code></a> - executes an arbitrary command, and can thus be used to launch an external application.</li>
+ <li><a href="#sys_eval"><code>sys_eval</code></a> - executes an arbitrary command, and returns it's output.</li>
+ <li><a href="#sys_exec"><code>sys_exec</code></a> - executes an arbitrary command, and returns it's exit code.</li>
<li><a href="#sys_get"><code>sys_get</code></a> - gets the value of an environment variable.</li>
<li><a href="#sys_set"><code>sys_set</code></a> - create an environment variable, or update the value of an existing environment variable.</li>
</ol>
@@ -31,6 +32,72 @@
Use <a href="#lib_mysqludf_sys_info"><code>lib_mysqludf_sys_info()</code></a> to obtain information about the currently installed version of <code>lib_mysqludf_sys</code>.
</p>
+
+ <a name="sys_eval"></a><h2>sys_eval</h2>
+ <p>
+ <code>sys_eval</code> takes one command string argument and executes it, returning its output.
+ </p>
+ <h3>Syntax</h3>
+<pre>sys_eval(<b>arg1</b>)</pre>
+ <h3>Parameters and Return Values</h3>
+ <dl>
+ <dt><code><b>arg1</b></code></dt>
+ <dd>
+ A command string valid for the current operating system or execution environment.
+ </dd>
+ <dt>returns</dt>
+ <dd>
+ Whatever output the command pushed to the standard output stream.
+ </dd>
+ </dl>
+ <h3>Installation</h3>
+ <p>
+ Place the shared library binary in an appropriate location.
+ Log in to mysql as root or as another user with sufficient privileges, and select any database.
+ Then, create the function using the following DDL statement:
+ </p>
+ <pre>
+CREATE FUNCTION sys_eval RETURNS STRING SONAME 'lib_mysqludf_sys.so';
+ </pre>
+ <p>
+ The function will be globally available in all databases.
+ </p>
+ <p>
+ The deinstall the function, run the following statement:
+ </p>
+ <pre>
+DROP FUNCTION sys_eval;
+ </pre>
+ <h3>Examples</h3>
+ <p>
+ None yet
+ </p>
+ <h3>A Note of Caution</h3>
+ <p>
+ Be very careful in deciding whether you need this function.
+ UDFs are available to all database users - you cannot grant EXECUTE privileges for them.
+ As the commandstring passed to <code>sys_exec</code> can do pretty much everything,
+ exposing the function poses a very real security hazard.
+ </p>
+ <p>
+ Even for a benign user, it is possible to accidentally do a lot of damage with it.
+ The call will be executed with the privileges of the os user that runs MySQL,
+ so it is entirely feasible to delete MySQL's data directory, or worse.
+ </p>
+ <p>
+ The function is intended for specialized MySQL applications where one needs extended
+ control over the operating system.
+ Currently, we do not have UDF's for ftp, email and http,
+ and this function can be used to implement such functionality in case it is really necessary
+ (datawarehouse staging areas could be a case in example).
+ </p>
+ <p>
+ You have been warned! If you don't see the hazard, please don't try to find it; just trust me on this.
+ </p>
+ <p>
+ If you do decide to use this library in a production environment, make sure that only specific commands can be run and file access is limited by using <a href="http://www.novell.com/documentation/apparmor/index.html">AppArmor</a>.
+ </p>
+
<a name="sys_exec"></a><h2>sys_exec</h2>
<p>
<code>sys_exec</code> takes one command string argument and executes it.
@@ -92,6 +159,9 @@
<p>
You have been warned! If you don't see the hazard, please don't try to find it; just trust me on this.
</p>
+ <p>
+ If you do decide to use this library in a production environment, make sure that only specific commands can be run and file access is limited by using <a href="http://www.novell.com/documentation/apparmor/index.html">AppArmor</a>.
+ </p>
<a name="sys_get"></a><h2>sys_get</h2>
<p>
<code>sys_get</code> takes the name of an environment variable and returns the value of the variable.
Binary files lib_mysqludf_sys_0.0.2/lib_mysqludf_sys.so and lib_mysqludf_sys/lib_mysqludf_sys.so differ
diff -uN lib_mysqludf_sys_0.0.2/lib_mysqludf_sys.sql lib_mysqludf_sys/lib_mysqludf_sys.sql
--- lib_mysqludf_sys_0.0.2/lib_mysqludf_sys.sql 2009-01-21 20:52:54.000000000 +0000
+++ lib_mysqludf_sys/lib_mysqludf_sys.sql 2009-01-21 00:51:00.000000000 +0000
@@ -1,8 +1,9 @@
/*
lib_mysqludf_sys - a library with miscellaneous (operating) system level functions
Copyright (C) 2007 Roland Bouman
--- lib_mysqludf_sys_0.0.2/lib_mysqludf_sys.sql 2009-01-22 12:01:55.000000000 +0000
+++ lib_mysqludf_sys/lib_mysqludf_sys.sql 2009-01-22 10:21:53.000000000 +0000
@@ -1,30 +1,33 @@
-/*
- lib_mysqludf_sys - a library with miscellaneous (operating) system level functions
- Copyright (C) 2007 Roland Bouman
- web: http://www.xcdsql.org/MySQL/UDF/
- email: mysqludfs@gmail.com
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with this library; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+/*
+ lib_mysqludf_sys - a library with miscellaneous (operating) system level functions
+ Copyright (C) 2007 Roland Bouman
+ Copyright (C) 2008-2009 Roland Bouman and Bernardo Damele A. G.
+ web: http://www.mysqludf.org/
+ email: mysqludfs@gmail.com, bernardo.damele@gmail.com
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@@ -19,12 +20,14 @@
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ email: roland.bouman@gmail.com, bernardo.damele@gmail.com
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-drop function lib_mysqludf_sys_info;
@ -217,7 +339,7 @@ diff -uN lib_mysqludf_sys_0.0.2/lib_mysqludf_sys.sql lib_mysqludf_sys/lib_mysqlu
+CREATE FUNCTION sys_exec RETURNS int SONAME 'lib_mysqludf_sys.so';
+CREATE FUNCTION sys_eval RETURNS string SONAME 'lib_mysqludf_sys.so';
diff -uN lib_mysqludf_sys_0.0.2/Makefile lib_mysqludf_sys/Makefile
--- lib_mysqludf_sys_0.0.2/Makefile 2009-01-21 20:52:54.000000000 +0000
--- lib_mysqludf_sys_0.0.2/Makefile 2009-01-22 12:01:55.000000000 +0000
+++ lib_mysqludf_sys/Makefile 2009-01-19 09:11:00.000000000 +0000
@@ -1,6 +1,4 @@
-linux: \

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extra/mysqludfsys/lib_mysqludf_sys_0.0.3.tar.gz
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