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    5. 

  5. <title>SyslogWriter xref</title>
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    9. 

  9. <div id="overview"><a href="../../../../../apidocs/org/apache/log4j/helpers/SyslogWriter.html">View Javadoc</a></div><pre>
    10. 

  10. 

  11. <a name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
    12. 

  12. <a name="2" href="#2">2</a>   <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
    13. 

  13. <a name="3" href="#3">3</a>   <em class="jxr_comment"> * contributor license agreements.  See the NOTICE file distributed with</em>
    14. 

  14. <a name="4" href="#4">4</a>   <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
    15. 

  15. <a name="5" href="#5">5</a>   <em class="jxr_comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em>
    16. 

  16. <a name="6" href="#6">6</a>   <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
    17. 

  17. <a name="7" href="#7">7</a>   <em class="jxr_comment"> * the License.  You may obtain a copy of the License at</em>
    18. 

  18. <a name="8" href="#8">8</a>   <em class="jxr_comment"> * </em>
    19. 

  19. <a name="9" href="#9">9</a>   <em class="jxr_comment"> *      <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
    20. 

  20. <a name="10" href="#10">10</a>  <em class="jxr_comment"> * </em>
    21. 

  21. <a name="11" href="#11">11</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
    22. 

  22. <a name="12" href="#12">12</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
    23. 

  23. <a name="13" href="#13">13</a>  <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
    24. 

  24. <a name="14" href="#14">14</a>  <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
    25. 

  25. <a name="15" href="#15">15</a>  <em class="jxr_comment"> * limitations under the License.</em>
    26. 

  26. <a name="16" href="#16">16</a>  <em class="jxr_comment"> */</em>
    27. 

  27. <a name="17" href="#17">17</a>  
    28. 

  28. <a name="18" href="#18">18</a>  <strong class="jxr_keyword">package</strong> org.apache.log4j.helpers;
    29. 

  29. <a name="19" href="#19">19</a>  
    30. 

  30. <a name="20" href="#20">20</a>  
    31. 

  31. <a name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.io.Writer;
    32. 

  32. <a name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> java.net.DatagramSocket;
    33. 

  33. <a name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.net.InetAddress;
    34. 

  34. <a name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.net.DatagramPacket;
    35. 

  35. <a name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> java.net.UnknownHostException;
    36. 

  36. <a name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> java.net.SocketException;
    37. 

  37. <a name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> java.io.IOException;
    38. 

  38. <a name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> java.net.URL;
    39. 

  39. <a name="29" href="#29">29</a>  <strong class="jxr_keyword">import</strong> java.net.MalformedURLException;
    40. 

  40. <a name="30" href="#30">30</a>  
    41. 

  41. <a name="31" href="#31">31</a>  <em class="jxr_javadoccomment">/**</em>
    42. 

  42. <a name="32" href="#32">32</a>  <em class="jxr_javadoccomment">   SyslogWriter is a wrapper around the java.net.DatagramSocket class</em>
    43. 

  43. <a name="33" href="#33">33</a>  <em class="jxr_javadoccomment">   so that it behaves like a java.io.Writer.</em>
    44. 

  44. <a name="34" href="#34">34</a>  
    45. 

  45. <a name="35" href="#35">35</a>  <em class="jxr_javadoccomment">   @since 0.7.3</em>
    46. 

  46. <a name="36" href="#36">36</a>  <em class="jxr_javadoccomment">*/</em>
    47. 

  47. <a name="37" href="#37">37</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/log4j/helpers/SyslogWriter.html">SyslogWriter</a> <strong class="jxr_keyword">extends</strong> Writer {
    48. 

  48. <a name="38" href="#38">38</a>  
    49. 

  49. <a name="39" href="#39">39</a>    <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> SYSLOG_PORT = 514;
    50. 

  50. <a name="40" href="#40">40</a>    <em class="jxr_javadoccomment">/**</em>
    51. 

  51. <a name="41" href="#41">41</a>  <em class="jxr_javadoccomment">   *  Host string from last constructed SyslogWriter.</em>
    52. 

  52. <a name="42" href="#42">42</a>  <em class="jxr_javadoccomment">   *  @deprecated</em>
    53. 

  53. <a name="43" href="#43">43</a>  <em class="jxr_javadoccomment">   */</em>
    54. 

  54. <a name="44" href="#44">44</a>    <strong class="jxr_keyword">static</strong> String syslogHost;
    55. 

  55. <a name="45" href="#45">45</a>    
    56. 

  56. <a name="46" href="#46">46</a>    <strong class="jxr_keyword">private</strong> InetAddress address;
    57. 

  57. <a name="47" href="#47">47</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> port;
    58. 

  58. <a name="48" href="#48">48</a>    <strong class="jxr_keyword">private</strong> DatagramSocket ds;
    59. 

  59. <a name="49" href="#49">49</a>  
    60. 

  60. <a name="50" href="#50">50</a>    <em class="jxr_javadoccomment">/**</em>
    61. 

  61. <a name="51" href="#51">51</a>  <em class="jxr_javadoccomment">   *  Constructs a new instance of SyslogWriter.</em>
    62. 

  62. <a name="52" href="#52">52</a>  <em class="jxr_javadoccomment">   *  @param syslogHost host name, may not be null.  A port</em>
    63. 

  63. <a name="53" href="#53">53</a>  <em class="jxr_javadoccomment">   *  may be specified by following the name or IPv4 literal address with</em>
    64. 

  64. <a name="54" href="#54">54</a>  <em class="jxr_javadoccomment">   *  a colon and a decimal port number.  To specify a port with an IPv6</em>
    65. 

  65. <a name="55" href="#55">55</a>  <em class="jxr_javadoccomment">   *  address, enclose the IPv6 address in square brackets before appending</em>
    66. 

  66. <a name="56" href="#56">56</a>  <em class="jxr_javadoccomment">   *  the colon and decimal port number.</em>
    67. 

  67. <a name="57" href="#57">57</a>  <em class="jxr_javadoccomment">   */</em>
    68. 

  68. <a name="58" href="#58">58</a>    <strong class="jxr_keyword">public</strong>
    69. 

  69. <a name="59" href="#59">59</a>    <a href="../../../../org/apache/log4j/helpers/SyslogWriter.html">SyslogWriter</a>(<strong class="jxr_keyword">final</strong> String syslogHost) {
    70. 

  70. <a name="60" href="#60">60</a>      SyslogWriter.syslogHost = syslogHost;
    71. 

  71. <a name="61" href="#61">61</a>      <strong class="jxr_keyword">if</strong> (syslogHost == <strong class="jxr_keyword">null</strong>) {
    72. 

  72. <a name="62" href="#62">62</a>          <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"syslogHost"</span>);
    73. 

  73. <a name="63" href="#63">63</a>      }
    74. 

  74. <a name="64" href="#64">64</a>      
    75. 

  75. <a name="65" href="#65">65</a>      String host = syslogHost;
    76. 

  76. <a name="66" href="#66">66</a>      <strong class="jxr_keyword">int</strong> urlPort = -1;
    77. 

  77. <a name="67" href="#67">67</a>      
    78. 

  78. <a name="68" href="#68">68</a>      <em class="jxr_comment">//</em>
    79. 

  79. <a name="69" href="#69">69</a>      <em class="jxr_comment">//  If not an unbracketed IPv6 address then</em>
    80. 

  80. <a name="70" href="#70">70</a>      <em class="jxr_comment">//      parse as a URL</em>
    81. 

  81. <a name="71" href="#71">71</a>      <em class="jxr_comment">//</em>
    82. 

  82. <a name="72" href="#72">72</a>      <strong class="jxr_keyword">if</strong> (host.indexOf(<span class="jxr_string">"["</span>) != -1 || host.indexOf(':') == host.lastIndexOf(':')) {
    83. 

  83. <a name="73" href="#73">73</a>          <strong class="jxr_keyword">try</strong> {
    84. 

  84. <a name="74" href="#74">74</a>              URL url = <strong class="jxr_keyword">new</strong> URL(<span class="jxr_string">"http://"</span> + host);
    85. 

  85. <a name="75" href="#75">75</a>              <strong class="jxr_keyword">if</strong> (url.getHost() != <strong class="jxr_keyword">null</strong>) {
    86. 

  86. <a name="76" href="#76">76</a>                  host = url.getHost();
    87. 

  87. <a name="77" href="#77">77</a>                  <em class="jxr_comment">//   if host is a IPv6 literal, strip off the brackets</em>
    88. 

  88. <a name="78" href="#78">78</a>                  <strong class="jxr_keyword">if</strong>(host.startsWith(<span class="jxr_string">"["</span>) &amp;&amp; host.charAt(host.length() - 1) == ']') {
    89. 

  89. <a name="79" href="#79">79</a>                      host = host.substring(1, host.length() - 1);
    90. 

  90. <a name="80" href="#80">80</a>                  }
    91. 

  91. <a name="81" href="#81">81</a>                  urlPort = url.getPort();
    92. 

  92. <a name="82" href="#82">82</a>              }
    93. 

  93. <a name="83" href="#83">83</a>          } <strong class="jxr_keyword">catch</strong>(MalformedURLException e) {
    94. 

  94. <a name="84" href="#84">84</a>        		LogLog.error(<span class="jxr_string">"Malformed URL: will attempt to interpret as InetAddress."</span>, e);
    95. 

  95. <a name="85" href="#85">85</a>          }
    96. 

  96. <a name="86" href="#86">86</a>      }
    97. 

  97. <a name="87" href="#87">87</a>      
    98. 

  98. <a name="88" href="#88">88</a>      <strong class="jxr_keyword">if</strong> (urlPort == -1) {
    99. 

  99. <a name="89" href="#89">89</a>          urlPort = SYSLOG_PORT;
    100. 

  100. <a name="90" href="#90">90</a>      }
    101. 

  101. <a name="91" href="#91">91</a>      port = urlPort;
    102. 

  102. <a name="92" href="#92">92</a>  
    103. 

  103. <a name="93" href="#93">93</a>      <strong class="jxr_keyword">try</strong> {      
    104. 

  104. <a name="94" href="#94">94</a>        <strong class="jxr_keyword">this</strong>.address = InetAddress.getByName(host);
    105. 

  105. <a name="95" href="#95">95</a>      }
    106. 

  106. <a name="96" href="#96">96</a>      <strong class="jxr_keyword">catch</strong> (UnknownHostException e) {
    107. 

  107. <a name="97" href="#97">97</a>        LogLog.error(<span class="jxr_string">"Could not find "</span> + host +
    108. 

  108. <a name="98" href="#98">98</a>  			 <span class="jxr_string">". All logging will FAIL."</span>, e);
    109. 

  109. <a name="99" href="#99">99</a>      }
    110. 

  110. <a name="100" href="#100">100</a> 
    111. 

  111. <a name="101" href="#101">101</a>     <strong class="jxr_keyword">try</strong> {
    112. 

  112. <a name="102" href="#102">102</a>       <strong class="jxr_keyword">this</strong>.ds = <strong class="jxr_keyword">new</strong> DatagramSocket();
    113. 

  113. <a name="103" href="#103">103</a>     }
    114. 

  114. <a name="104" href="#104">104</a>     <strong class="jxr_keyword">catch</strong> (SocketException e) {
    115. 

  115. <a name="105" href="#105">105</a>       e.printStackTrace();
    116. 

  116. <a name="106" href="#106">106</a>       LogLog.error(<span class="jxr_string">"Could not instantiate DatagramSocket to "</span> + host +
    117. 

  117. <a name="107" href="#107">107</a> 			 <span class="jxr_string">". All logging will FAIL."</span>, e);
    118. 

  118. <a name="108" href="#108">108</a>     }
    119. 

  119. <a name="109" href="#109">109</a>     
    120. 

  120. <a name="110" href="#110">110</a>   }
    121. 

  121. <a name="111" href="#111">111</a> 
    122. 

  122. <a name="112" href="#112">112</a> 
    123. 

  123. <a name="113" href="#113">113</a>   <strong class="jxr_keyword">public</strong>
    124. 

  124. <a name="114" href="#114">114</a>   <strong class="jxr_keyword">void</strong> write(<strong class="jxr_keyword">char</strong>[] buf, <strong class="jxr_keyword">int</strong> off, <strong class="jxr_keyword">int</strong> len) <strong class="jxr_keyword">throws</strong> IOException {
    125. 

  125. <a name="115" href="#115">115</a>     <strong class="jxr_keyword">this</strong>.write(<strong class="jxr_keyword">new</strong> String(buf, off, len));
    126. 

  126. <a name="116" href="#116">116</a>   }
    127. 

  127. <a name="117" href="#117">117</a>   
    128. 

  128. <a name="118" href="#118">118</a>   <strong class="jxr_keyword">public</strong>
    129. 

  129. <a name="119" href="#119">119</a>   <strong class="jxr_keyword">void</strong> write(<strong class="jxr_keyword">final</strong> String string) <strong class="jxr_keyword">throws</strong> IOException {
    130. 

  130. <a name="120" href="#120">120</a> 
    131. 

  131. <a name="121" href="#121">121</a>     <strong class="jxr_keyword">if</strong>(<strong class="jxr_keyword">this</strong>.ds != <strong class="jxr_keyword">null</strong> &amp;&amp; <strong class="jxr_keyword">this</strong>.address != <strong class="jxr_keyword">null</strong>) {
    132. 

  132. <a name="122" href="#122">122</a>         byte[] bytes = string.getBytes();
    133. 

  133. <a name="123" href="#123">123</a>         <em class="jxr_comment">//</em>
    134. 

  134. <a name="124" href="#124">124</a>         <em class="jxr_comment">//  syslog packets must be less than 1024 bytes</em>
    135. 

  135. <a name="125" href="#125">125</a>         <em class="jxr_comment">//</em>
    136. 

  136. <a name="126" href="#126">126</a>         <strong class="jxr_keyword">int</strong> bytesLength = bytes.length;
    137. 

  137. <a name="127" href="#127">127</a>         <strong class="jxr_keyword">if</strong> (bytesLength &gt;= 1024) {
    138. 

  138. <a name="128" href="#128">128</a>             bytesLength = 1024;
    139. 

  139. <a name="129" href="#129">129</a>         }
    140. 

  140. <a name="130" href="#130">130</a>         DatagramPacket packet = <strong class="jxr_keyword">new</strong> DatagramPacket(bytes, bytesLength,
    141. 

  141. <a name="131" href="#131">131</a>                                address, port);
    142. 

  142. <a name="132" href="#132">132</a>         ds.send(packet);
    143. 

  143. <a name="133" href="#133">133</a>     }
    144. 

  144. <a name="134" href="#134">134</a>     
    145. 

  145. <a name="135" href="#135">135</a>   }
    146. 

  146. <a name="136" href="#136">136</a> 
    147. 

  147. <a name="137" href="#137">137</a>   <strong class="jxr_keyword">public</strong>
    148. 

  148. <a name="138" href="#138">138</a>   <strong class="jxr_keyword">void</strong> flush() {}
    149. 

  149. <a name="139" href="#139">139</a> 
    150. 

  150. <a name="140" href="#140">140</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> close() {
    151. 

  151. <a name="141" href="#141">141</a>       <strong class="jxr_keyword">if</strong> (ds != <strong class="jxr_keyword">null</strong>) {
    152. 

  152. <a name="142" href="#142">142</a>           ds.close();
    153. 

  153. <a name="143" href="#143">143</a>       }
    154. 

  154. <a name="144" href="#144">144</a>   }
    155. 

  155. <a name="145" href="#145">145</a> }
    156. 

  156. </pre>
    157. 

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    158. 

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    159. 

  159. 

  160.