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137 lines
4.0 KiB
XML
137 lines
4.0 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 62126c55f1c6ed444043e7272c4f9e233818a44b Maintainer: yuanyuqiang Status: ready -->
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<!-- CREDITS: mowangjuanzi, Luffy -->
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<!-- splitted from ./en/functions/exec.xml, last change in rev 1.2 -->
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<refentry xml:id="function.escapeshellcmd" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>escapeshellcmd</refname>
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<refpurpose>shell 元字符转义</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>string</type><methodname>escapeshellcmd</methodname>
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<methodparam><type>string</type><parameter>command</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>escapeshellcmd</function> 对字符串中可能会欺骗
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shell 命令执行任意命令的字符进行转义。
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此函数保证用户输入的数据在传送到
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<function>exec</function> 或
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<function>system</function> 函数，或者 <link
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linkend="language.operators.execution">执行操作符</link> 之前进行转义。
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</para>
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<para>
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反斜线（\）会在以下字符之前插入：<literal>&#;`|*?~<>^()[]{}$\</literal>、<literal>\x0A</literal>
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和 <literal>\xFF</literal>。 <literal>'</literal> 和 <literal>"</literal>
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仅在不配对儿的时候被转义。在 Windows 平台上，所有这些字符以及 <literal>%</literal>
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和 <literal>!</literal> 字符前面都有一个插入符号（<literal>^</literal>）。
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>command</parameter></term>
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<listitem>
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<para>
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要转义的命令。
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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转义后的字符串。
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title><function>escapeshellcmd</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// 我们故意允许任意数量的参数
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$command = './configure '.$_POST['configure_options'];
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$escaped_command = escapeshellcmd($command);
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system($escaped_command);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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<refsect1 role="notes">
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&reftitle.notes;
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<warning xmlns="http://docbook.org/ns/docbook">
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<para>
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<function>escapeshellcmd</function> 应被用在完整的命令字符串上。
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即使如此，攻击者还是可以传入任意数量的参数。
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请使用 <function>escapeshellarg</function> 函数
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对单个参数进行转义。
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</para>
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</warning>
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<warning xmlns="http://docbook.org/ns/docbook">
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<para>
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<function>escapeshellcmd</function> 不会对空格转义，这在 Windows
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上对这样的路径（比如<literal>C:\Program
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Files\ProgramName\program.exe</literal>）可能会有出现问题。可以使用如下代码暂时解决：
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<programlisting role="php">
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<![CDATA[
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<?php
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$cmd = preg_replace('`(?<!^) `', '^ ', escapeshellcmd($cmd));
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]]>
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</programlisting>
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</para>
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</warning>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>escapeshellarg</function></member>
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<member><function>exec</function></member>
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<member><function>popen</function></member>
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<member><function>system</function></member>
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<member><link linkend="language.operators.execution">执行运算符</link></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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