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208 lines
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HTML
208 lines
7.0 KiB
HTML
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<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<link rel="stylesheet" type="text/css" href="../mysqludf.css"/>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>lib_mysqludf_sys - A library of MySQL UDFs for working with the environment in which MySQL runs</title>
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</head>
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<body>
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<div>
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<a href="../index.html">Top</a>
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| <a href="../mysql_udf_repository_libraries.html">Up</a>
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</div>
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<h1>lib_mysqludf_sys</h1>
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<div>
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<a href="lib_mysqludf_sys.html">Documentation</a>
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| <a href="lib_mysqludf_sys.so">Binary</a>
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| <a href="lib_mysqludf_sys.sql">Installation</a>
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| <a href="lib_mysqludf_sys.c">Source</a>
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| <a href="lib_mysqludf_sys_0.0.2.tar.gz">tar.gz</a>
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</div>
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<p>
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This library <code>lib_mysqludf_sys</code> contains a number of functions that allows one to interact with the operating system.
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</p>
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<ol>
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<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>
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<li><a href="#sys_get"><code>sys_get</code></a> - gets the value of an environment variable.</li>
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<li><a href="#sys_set"><code>sys_set</code></a> - create an environment variable, or update the value of an existing environment variable.</li>
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</ol>
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<p>
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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>.
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</p>
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<a name="sys_exec"></a><h2>sys_exec</h2>
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<p>
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<code>sys_exec</code> takes one command string argument and executes it.
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</p>
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<h3>Syntax</h3>
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<pre>sys_exec(<b>arg1</b>)</pre>
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<h3>Parameters and Return Values</h3>
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<dl>
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<dt><code><b>arg1</b></code></dt>
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<dd>
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A command string valid for the current operating system or execution environment.
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</dd>
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<dt>returns</dt>
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<dd>
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An (integer) exit code returned by the executed process.
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</dd>
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</dl>
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<h3>Installation</h3>
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<p>
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Place the shared library binary in an appropriate location.
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Log in to mysql as root or as another user with sufficient privileges, and select any database.
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Then, create the function using the following DDL statement:
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</p>
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<pre>
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CREATE FUNCTION sys_exec RETURNS INT SONAME 'lib_mysqludf_sys.so';
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</pre>
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<p>
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The function will be globally available in all databases.
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</p>
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<p>
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The deinstall the function, run the following statement:
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</p>
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<pre>
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DROP FUNCTION sys_exec;
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</pre>
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<h3>Examples</h3>
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<p>
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None yet
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</p>
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<h3>A Note of Caution</h3>
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<p>
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Be very careful in deciding whether you need this function.
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UDFs are available to all database users - you cannot grant EXECUTE privileges for them.
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As the commandstring passed to <code>sys_exec</code> can do pretty much everything,
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exposing the function poses a very real security hazard.
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</p>
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<p>
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Even for a benign user, it is possible to accidentally do a lot of damage with it.
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The call will be executed with the privileges of the os user that runs MySQL,
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so it is entirely feasible to delete MySQL's data directory, or worse.
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</p>
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<p>
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The function is intended for specialized MySQL applications where one needs extended
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control over the operating system.
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Currently, we do not have UDF's for ftp, email and http,
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and this function can be used to implement such functionality in case it is really necessary
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(datawarehouse staging areas could be a case in example).
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</p>
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<p>
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You have been warned! If you don't see the hazard, please don't try to find it; just trust me on this.
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</p>
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<a name="sys_get"></a><h2>sys_get</h2>
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<p>
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<code>sys_get</code> takes the name of an environment variable and returns the value of the variable.
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</p>
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<h3>Syntax</h3>
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<pre>sys_get([<b>arg1</b>)</pre>
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<h3>Parameters and Return Values</h3>
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<dl>
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<dt><code><b>arg1</b></code></dt>
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<dd>
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A string that denotes the name of an environment value.
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</dd>
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<dt>returns</dt>
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<dd>
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If the variable exists, a string containing the value of the environment variable.
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If the variable does not exist, the function return NULL.
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</dd>
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</dl>
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<h3>Installation</h3>
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<p>
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Place the shared library binary in an appropriate location.
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Log in to mysql as root or as another user with sufficient privileges, and select any database.
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Then, create the function using the following DDL statement:
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</p>
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<pre>
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CREATE FUNCTION sys_get RETURNS STRING SONAME 'lib_mysqludf_sys.so';
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</pre>
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<p>
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The function will be globally available in all databases.
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</p>
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<p>
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The deinstall the function, run the following statement:
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</p>
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<pre>
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DROP FUNCTION sys_get;
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</pre>
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<h3>Examples</h3>
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<p>
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None yet
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</p>
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<h3>A Note of Caution</h3>
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<p>
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Be very careful in deciding whether you need this function.
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UDFs are available to all database users - you cannot grant EXECUTE privileges for them.
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The variables known in the environment where mysql runs are freely accessible using this function.
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Any user can get access to potentially secret information, such as
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the user that is running mysqld, the path of the user's home directory etc.
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</p>
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<p>
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The function is intended for specialized MySQL applications where one needs extended
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control over the operating system.
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</p>
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<p>
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You have been warned! If you don't see the hazard, please don't try to find it; just trust me on this.
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</p>
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<a name="sys_set"></a><h2>sys_set</h2>
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<p>
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<code>sys_get</code> takes the name of an environment variable and returns the value of the variable.
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</p>
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<h3>Syntax</h3>
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<pre>sys_set([<b>arg1, arg2</b>)</pre>
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<h3>Parameters and Return Values</h3>
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<dl>
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<dt><code><b>arg1</b></code></dt>
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<dd>
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A string that denotes the name of an environment value.
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</dd>
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<dt><code><b>arg2</b></code></dt>
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<dd>
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An expression that contains the value that is to be assigned to the environment variable.
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</dd>
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<dt>returns</dt>
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<dd>
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0 if the assignment or creation succeed.
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non-zero otherwise.
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</dd>
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</dl>
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<h3>Installation</h3>
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<p>
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Place the shared library binary in an appropriate location.
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Log in to mysql as root or as another user with sufficient privileges, and select any database.
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Then, create the function using the following DDL statement:
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</p>
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<pre>
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CREATE FUNCTION sys_set RETURNS STRING SONAME 'lib_mysqludf_sys.so';
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</pre>
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<p>
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The function will be globally available in all databases.
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</p>
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<p>
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The deinstall the function, run the following statement:
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</p>
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<pre>
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DROP FUNCTION sys_set;
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</pre>
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<h3>Examples</h3>
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<p>
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None yet
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</p>
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<h3>A Note of Caution</h3>
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<p>
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Be very careful in deciding whether you need this function.
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UDFs are available to all database users - you cannot grant EXECUTE privileges for them.
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This function will overwrite existing environment variables.
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</p>
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<p>
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The function is intended for specialized MySQL applications where one needs extended
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control over the operating system.
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</p>
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<p>
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You have been warned! If you don't see the hazard, please don't try to find it; just trust me on this.
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</p>
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|
|
</body>
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|
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</html
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