release/src/router/iptables/iptables.xslt

   1 <?xml version="1.0" encoding="ISO-8859-1"?>
   2 <!-- Converts from simple xml iptables format to iptables-save format
   3      Copyright 2006 UfoMechanic
   4      Author: azez@ufomechanic.net
   5      This code is distributed and licensed under the terms of GNU GPL v2
   6
   7      This sample usage outputs roughly want goes in
   8        iptables-save | iptables-xml -c | xsltproc iptables.xslt -
   9      -->
  10 <xsl:transform version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  11   <xsl:output method = "text" />
  12   <xsl:strip-space elements="*" />
  13
  14   <!-- output conditions of a rule but not an action -->
  15   <xsl:template match="iptables-rules/table/chain/rule/conditions/*">
  16     <!-- <match> is the psuedo module when a match module doesn't need to be loaded
  17          and when -m does not need to be inserted -->
  18     <xsl:if test="name() != 'match'">
  19       <xsl:text> -m </xsl:text><xsl:value-of select="name()"/>
  20     </xsl:if>
  21     <xsl:apply-templates select="node()"/>
  22   </xsl:template>
  23
  24   <!-- delete the actions or conditions containers, and process child nodes -->
  25   <xsl:template match="iptables-rules/table/chain/rule/actions|table/chain/rule/conditions">
  26     <xsl:apply-templates select="*"/>
  27   </xsl:template>
  28
  29   <xsl:template match="iptables-rules/table/chain/rule/actions/goto">
  30     <xsl:text> -g </xsl:text>
  31     <xsl:apply-templates select="*"/>
  32     <xsl:text>&#xA;</xsl:text>
  33   </xsl:template>
  34   <xsl:template match="iptables-rules/table/chain/rule/actions/call">
  35     <xsl:text> -j </xsl:text>
  36     <xsl:apply-templates select="*"/>
  37     <xsl:text>&#xA;</xsl:text>
  38   </xsl:template>
  39   <!-- all other actions are module actions -->
  40   <xsl:template match="iptables-rules/table/chain/rule/actions/*">
  41     <xsl:text> -j </xsl:text><xsl:value-of select="name()"/>
  42     <xsl:apply-templates select="*"/>
  43     <xsl:text>&#xA;</xsl:text>
  44   </xsl:template>
  45
  46   <!-- all child action nodes -->
  47   <xsl:template match="iptables-rules/table/chain/rule/actions/*/*|iptables-rules/table/chain/rule/actions/*//*|iptables-rules/table/chain/rule/conditions/*/*|iptables-rules/table/chain/rule/conditions/*//*">
  48     <xsl:if test="@invert=1"><xsl:text> !</xsl:text></xsl:if>
  49     <xsl:text> -</xsl:text>
  50     <!-- if length of name is 1 character, then only do 1 - not 2 -->
  51     <xsl:if test="string-length(name())&gt;1">
  52       <xsl:text>-</xsl:text>
  53     </xsl:if>
  54     <xsl:value-of select="name()"/>
  55     <xsl:text> </xsl:text><xsl:value-of select="."/>
  56   </xsl:template>
  57
  58   <xsl:template match="iptables-rules/table/chain/rule/actions/call/*|iptables-rules/table/chain/rule/actions/goto/*">
  59     <xsl:value-of select="name()"/>
  60     <!-- I bet there are no child nodes, should we risk it? -->
  61     <xsl:apply-templates select="node()"/>
  62   </xsl:template>
  63
  64   <!-- output the head of the rule, and any conditions -->
  65   <xsl:template name="rule-head">
  66     <xsl:if test="string-length(@packet-count)+string-length(@byte-count)">
  67       <xsl:call-template name="counters"><xsl:with-param name="node" select="."/></xsl:call-template>
  68       <xsl:text> </xsl:text>
  69     </xsl:if>
  70     <xsl:text>-A </xsl:text><!-- a rule must be under a chain -->
  71     <xsl:value-of select="../@name" />
  72     <xsl:apply-templates select="conditions"/>
  73   </xsl:template>
  74
  75   <!-- Output a single rule, perhaps as multiple rules if we have more than one action -->
  76   <xsl:template match="iptables-rules/table/chain/rule">
  77     <xsl:choose>
  78       <xsl:when test="count(actions/*)&gt;0">
  79         <xsl:for-each select="actions/*">
  80           <!-- and a for-each to re-select the rule as the current node, to write the rule-head -->
  81           <xsl:for-each select="../..">
  82             <xsl:call-template name="rule-head"/>
  83           </xsl:for-each>
  84           <!-- now write the this action -->
  85           <xsl:apply-templates select="."/>
  86         </xsl:for-each>
  87       </xsl:when>
  88       <xsl:otherwise>
  89         <!-- no need to loop if there are no actions, just output conditions -->
  90         <xsl:call-template name="rule-head"/>
  91         <xsl:text>&#xA;</xsl:text>
  92       </xsl:otherwise>
  93     </xsl:choose>
  94   </xsl:template>
  95
  96   <xsl:template match="iptables-rules/table">
  97     <xsl:text># Generated by iptables.xslt&#xA;</xsl:text>
  98     <xsl:text>*</xsl:text><xsl:value-of select="@name"/><xsl:text>&#xA;</xsl:text>
  99     <!-- Loop through each chain and output the chain header -->
 100     <xsl:for-each select="chain">
 101       <xsl:text>:</xsl:text>
 102       <xsl:value-of select="@name"/>
 103       <xsl:text> </xsl:text>
 104       <xsl:choose>
 105         <xsl:when test="not(string-length(@policy))"><xsl:text>-</xsl:text></xsl:when>
 106         <xsl:otherwise><xsl:value-of select="@policy"/></xsl:otherwise>
 107       </xsl:choose>
 108       <xsl:text> </xsl:text>
 109       <xsl:call-template name="counters"><xsl:with-param name="node" select="."/></xsl:call-template>
 110       <xsl:text>&#xA;</xsl:text>
 111     </xsl:for-each>
 112     <!-- Loop through each chain and output the rules -->
 113     <xsl:apply-templates select="node()"/>
 114     <xsl:text>COMMIT&#xA;# Completed&#xA;</xsl:text>
 115   </xsl:template>
 116
 117   <xsl:template name="counters">
 118     <xsl:param name="$node"/>
 119     <xsl:text>[</xsl:text>
 120     <xsl:if test="string-length($node/@packet-count)"><xsl:value-of select="$node/@packet-count"/></xsl:if>
 121     <xsl:if test="string-length($node/@packet-count)=0">0</xsl:if>
 122     <xsl:text>:</xsl:text>
 123     <xsl:if test="string-length($node/@byte-count)"><xsl:value-of select="$node/@byte-count"/></xsl:if>
 124     <xsl:if test="string-length($node/@byte-count)=0">0</xsl:if>
 125     <xsl:text>]</xsl:text>
 126   </xsl:template>
 127
 128   <!-- the bit that automatically recurses for us, NOTE: we use * not node(), we don't want to copy every white space text -->
 129   <xsl:template match="@*|node()">
 130     <xsl:copy>
 131       <!-- with libxslt xsltproc we can't do @*|node() or the nodes may get processed before the attributes -->
 132       <xsl:apply-templates select="@*"/>
 133       <xsl:apply-templates select="node()"/>
 134     </xsl:copy>
 135   </xsl:template>
 136
 137 </xsl:transform>