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/conditions//*" priority="0">
  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>
  56     <xsl:apply-templates select="node()"/>
  57   </xsl:template>
  58
  59   <xsl:template match="iptables-rules/table/chain/rule/actions/call/*|iptables-rules/table/chain/rule/actions/goto/*">
  60     <xsl:value-of select="name()"/>
  61     <!-- I bet there are no child nodes, should we risk it? -->
  62     <xsl:apply-templates select="node()"/>
  63   </xsl:template>
  64
  65   <!-- output the head of the rule, and any conditions -->
  66   <xsl:template name="rule-head">
  67     <xsl:if test="string-length(@packet-count)+string-length(@byte-count)">
  68       <xsl:call-template name="counters"><xsl:with-param name="node" select="."/></xsl:call-template>
  69       <xsl:text> </xsl:text>
  70     </xsl:if>
  71     <xsl:text>-A </xsl:text><!-- a rule must be under a chain -->
  72     <xsl:value-of select="../@name" />
  73     <xsl:apply-templates select="conditions"/>
  74   </xsl:template>
  75
  76   <!-- Output a single rule, perhaps as multiple rules if we have more than one action -->
  77   <xsl:template match="iptables-rules/table/chain/rule">
  78     <xsl:choose>
  79       <xsl:when test="count(actions/*)&gt;0">
  80         <xsl:for-each select="actions/*">
  81           <!-- and a for-each to re-select the rule as the current node, to write the rule-head -->
  82           <xsl:for-each select="../..">
  83             <xsl:call-template name="rule-head"/>
  84           </xsl:for-each>
  85           <!-- now write the this action -->
  86           <xsl:apply-templates select="."/>
  87         </xsl:for-each>
  88       </xsl:when>
  89       <xsl:otherwise>
  90         <!-- no need to loop if there are no actions, just output conditions -->
  91         <xsl:call-template name="rule-head"/>
  92         <xsl:text>&#xA;</xsl:text>
  93       </xsl:otherwise>
  94     </xsl:choose>
  95   </xsl:template>
  96
  97   <xsl:template match="iptables-rules/table">
  98     <xsl:text># Generated by iptables.xslt&#xA;</xsl:text>
  99     <xsl:text>*</xsl:text><xsl:value-of select="@name"/><xsl:text>&#xA;</xsl:text>
 100     <!-- Loop through each chain and output the chain header -->
 101     <xsl:for-each select="chain">
 102       <xsl:text>:</xsl:text>
 103       <xsl:value-of select="@name"/>
 104       <xsl:text> </xsl:text>
 105       <xsl:choose>
 106         <xsl:when test="not(string-length(@policy))"><xsl:text>-</xsl:text></xsl:when>
 107         <xsl:otherwise><xsl:value-of select="@policy"/></xsl:otherwise>
 108       </xsl:choose>
 109       <xsl:text> </xsl:text>
 110       <xsl:call-template name="counters"><xsl:with-param name="node" select="."/></xsl:call-template>
 111       <xsl:text>&#xA;</xsl:text>
 112     </xsl:for-each>
 113     <!-- Loop through each chain and output the rules -->
 114     <xsl:apply-templates select="node()"/>
 115     <xsl:text>COMMIT&#xA;# Completed&#xA;</xsl:text>
 116   </xsl:template>
 117
 118   <xsl:template name="counters">
 119     <xsl:param name="node"/>
 120     <xsl:text>[</xsl:text>
 121     <xsl:if test="string-length($node/@packet-count)"><xsl:value-of select="$node/@packet-count"/></xsl:if>
 122     <xsl:if test="string-length($node/@packet-count)=0">0</xsl:if>
 123     <xsl:text>:</xsl:text>
 124     <xsl:if test="string-length($node/@byte-count)"><xsl:value-of select="$node/@byte-count"/></xsl:if>
 125     <xsl:if test="string-length($node/@byte-count)=0">0</xsl:if>
 126     <xsl:text>]</xsl:text>
 127   </xsl:template>
 128
 129   <!-- the bit that automatically recurses for us, NOTE: we use * not node(), we don't want to copy every white space text -->
 130   <xsl:template match="@*|node()">
 131     <xsl:copy>
 132       <!-- with libxslt xsltproc we can't do @*|node() or the nodes may get processed before the attributes -->
 133       <xsl:apply-templates select="@*"/>
 134       <xsl:apply-templates select="node()"/>
 135     </xsl:copy>
 136   </xsl:template>
 137
 138 </xsl:transform>