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<head>
<title>Class: Net::SSH::Transport::OutgoingPacketStream</title>
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<div id="classHeader">
<table class="header-table">
<tr class="top-aligned-row">
<td><strong>Class</strong></td>
<td class="class-name-in-header">Net::SSH::Transport::OutgoingPacketStream</td>
</tr>
<tr class="top-aligned-row">
<td><strong>In:</strong></td>
<td>
<a href="../../../../files/lib/net/ssh/transport/packet-stream_rb.html">
lib/net/ssh/transport/packet-stream.rb
</a>
<br />
</td>
</tr>
<tr class="top-aligned-row">
<td><strong>Parent:</strong></td>
<td>
<a href="PacketStream.html">
PacketStream
</a>
</td>
</tr>
</table>
</div>
<!-- banner header -->
<div id="bodyContent">
<div id="contextContent">
<div id="description">
<p>
Handles the compression and encryption of outgoing packets.
</p>
</div>
</div>
<div id="method-list">
<h3 class="section-bar">Methods</h3>
<div class="name-list">
<a href="#M000063">new</a>
<a href="#M000065">send</a>
<a href="#M000064">set_algorithms</a>
</div>
</div>
</div>
<!-- if includes -->
<div id="section">
<!-- if method_list -->
<div id="methods">
<h3 class="section-bar">Public Class methods</h3>
<div id="method-M000063" class="method-detail">
<a name="M000063"></a>
<div class="method-heading">
<a href="#M000063" class="method-signature">
<span class="method-name">new</span><span class="method-args">( ciphers, hmacs, compressors )</span>
</a>
</div>
<div class="method-description">
<p>
Create a new <a href="OutgoingPacketStream.html">OutgoingPacketStream</a>.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000063-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000063-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/packet-stream.rb, line 70</span>
70: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">initialize</span>( <span class="ruby-identifier">ciphers</span>, <span class="ruby-identifier">hmacs</span>, <span class="ruby-identifier">compressors</span> )
71: <span class="ruby-keyword kw">super</span>( <span class="ruby-identifier">ciphers</span>, <span class="ruby-identifier">hmacs</span> )
72: <span class="ruby-ivar">@compressor</span> = <span class="ruby-identifier">compressors</span>.<span class="ruby-identifier">fetch</span>( <span class="ruby-value str">"none"</span> )
73: <span class="ruby-ivar">@mutex</span> = <span class="ruby-constant">Mutex</span>.<span class="ruby-identifier">new</span>
74: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<h3 class="section-bar">Public Instance methods</h3>
<div id="method-M000065" class="method-detail">
<a name="M000065"></a>
<div class="method-heading">
<a href="#M000065" class="method-signature">
<span class="method-name">send</span><span class="method-args">( payload )</span>
</a>
</div>
<div class="method-description">
<p>
Send the given payload over the socket, after (possibly) compressing and
encrypting it. The payload is converted to a string (using to_s) before
being manipulated.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000065-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000065-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/packet-stream.rb, line 85</span>
85: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">send</span>( <span class="ruby-identifier">payload</span> )
86: <span class="ruby-ivar">@mutex</span>.<span class="ruby-identifier">synchronize</span> <span class="ruby-keyword kw">do</span>
87: <span class="ruby-comment cmt"># force the payload into a string</span>
88: <span class="ruby-identifier">payload</span> = <span class="ruby-ivar">@compressor</span>.<span class="ruby-identifier">compress</span>( <span class="ruby-identifier">payload</span>.<span class="ruby-identifier">to_s</span> )
89:
90: <span class="ruby-comment cmt"># the length of the packet, minus the padding</span>
91: <span class="ruby-identifier">actual_length</span> = <span class="ruby-value">4</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">payload</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span>
92:
93: <span class="ruby-comment cmt"># compute the padding length</span>
94: <span class="ruby-identifier">padding_length</span> = <span class="ruby-ivar">@cipher</span>.<span class="ruby-identifier">block_size</span> <span class="ruby-operator">-</span>
95: ( <span class="ruby-identifier">actual_length</span> <span class="ruby-operator">%</span> <span class="ruby-ivar">@cipher</span>.<span class="ruby-identifier">block_size</span> )
96: <span class="ruby-identifier">padding_length</span> <span class="ruby-operator">+=</span> <span class="ruby-ivar">@cipher</span>.<span class="ruby-identifier">block_size</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">padding_length</span> <span class="ruby-operator"><</span> <span class="ruby-value">4</span>
97:
98: <span class="ruby-comment cmt"># compute the packet length (sans the length field itself)</span>
99: <span class="ruby-identifier">packet_length</span> = <span class="ruby-identifier">payload</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">padding_length</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span>
100:
101: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">packet_length</span> <span class="ruby-operator"><</span> <span class="ruby-value">16</span>
102: <span class="ruby-identifier">padding_length</span> <span class="ruby-operator">+=</span> <span class="ruby-ivar">@cipher</span>.<span class="ruby-identifier">block_size</span>
103: <span class="ruby-identifier">packet_length</span> = <span class="ruby-identifier">payload</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">padding_length</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span>
104: <span class="ruby-keyword kw">end</span>
105:
106: <span class="ruby-identifier">padding</span> = <span class="ruby-constant">Array</span>.<span class="ruby-identifier">new</span>( <span class="ruby-identifier">padding_length</span> ) { <span class="ruby-identifier">rand</span>(<span class="ruby-value">256</span>) }.<span class="ruby-identifier">pack</span>(<span class="ruby-value str">"C*"</span>)
107:
108: <span class="ruby-identifier">unencrypted_data</span> = [ <span class="ruby-identifier">packet_length</span>, <span class="ruby-identifier">padding_length</span>, <span class="ruby-identifier">payload</span>,
109: <span class="ruby-identifier">padding</span> ].<span class="ruby-identifier">pack</span>( <span class="ruby-value str">"NCA*A*"</span> )
110: <span class="ruby-identifier">mac</span> = <span class="ruby-identifier">compute_hmac</span>( <span class="ruby-identifier">unencrypted_data</span> )
111:
112: <span class="ruby-identifier">encrypted_data</span> = <span class="ruby-ivar">@cipher</span>.<span class="ruby-identifier">update</span>( <span class="ruby-identifier">unencrypted_data</span> ) <span class="ruby-operator"><<</span> <span class="ruby-ivar">@cipher</span>.<span class="ruby-identifier">final</span>
113: <span class="ruby-identifier">message</span> = <span class="ruby-identifier">encrypted_data</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">mac</span>
114: <span class="ruby-ivar">@socket</span>.<span class="ruby-identifier">send</span> <span class="ruby-identifier">message</span>, <span class="ruby-value">0</span>
115:
116: <span class="ruby-identifier">increment_sequence_number</span>
117: <span class="ruby-keyword kw">end</span>
118: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000064" class="method-detail">
<a name="M000064"></a>
<div class="method-heading">
<a href="#M000064" class="method-signature">
<span class="method-name">set_algorithms</span><span class="method-args">( cipher, hmac, compressor )</span>
</a>
</div>
<div class="method-description">
<p>
Set the cipher, mac, and compressor to the given values.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000064-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000064-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/packet-stream.rb, line 77</span>
77: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">set_algorithms</span>( <span class="ruby-identifier">cipher</span>, <span class="ruby-identifier">hmac</span>, <span class="ruby-identifier">compressor</span> )
78: <span class="ruby-keyword kw">super</span>( <span class="ruby-identifier">cipher</span>, <span class="ruby-identifier">hmac</span> )
79: <span class="ruby-ivar">@compressor</span> = <span class="ruby-identifier">compressor</span>
80: <span class="ruby-keyword kw">end</span>
</pre>
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