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<title>Class: Net::SSH::Transport::VersionNegotiator</title>
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<td class="file-title"><span class="file-title-prefix">Class</span><br />Net::SSH::Transport::VersionNegotiator</td>
<td align="right">
<table cellspacing=0 cellpadding=2>
<tr valign="top">
<td>In:</td>
<td>
<a href="../../../../files/lib/net/ssh/transport/version-negotiator_rb.html">lib/net/ssh/transport/version-negotiator.rb</a>
</td>
</tr>
<tr>
<td>Parent:</td>
<td>
Object
</td>
</tr>
</table>
</td>
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</table>
<!-- banner header -->
<div id="bodyContent">
<div id="content">
<div class="description"><p>
Manages the negotiation of the version strings between client and server.
</p>
</div>
<div class="sectiontitle">Methods</div>
<ul>
<li><a href="#M000063">negotiate</a></li>
<li><a href="#M000062">new</a></li>
</ul>
<div class="sectiontitle">Constants</div>
<table border='0' cellpadding='5'>
<tr valign='top'>
<td class="attr-name">VERSION_LINE</td>
<td>=</td>
<td class="attr-value">/^SSH-/</td>
</tr>
<tr valign='top'>
<td> </td>
<td colspan="2" class="attr-desc">
For processing the version header. The version reported by the server must
match this pattern.
</td>
</tr>
<tr valign='top'>
<td class="attr-name">REQUIRED_VERSION_PATTERN</td>
<td>=</td>
<td class="attr-value">/^SSH-(1.99|2.0)-/</td>
</tr>
<tr valign='top'>
<td> </td>
<td colspan="2" class="attr-desc">
Only versions matching this pattern are supported by <a
href="../../SSH.html">Net::SSH</a>.
</td>
</tr>
</table>
<div class="sectiontitle">Attributes</div>
<table border='0' cellpadding='5'>
<tr valign='top'>
<td class='attr-rw'>
[R]
</td>
<td class='attr-name'>header_lines</td>
<td class='attr-desc'>
An array of lines returned by the server prior to reporting the version.
</td>
</tr>
</table>
<div class="sectiontitle">Public Class methods</div>
<div class="method">
<div class="title">
<a name="M000062"></a><b>new</b>( logger )
</div>
<div class="description">
<p>
Creates a <a href="VersionNegotiator.html#M000062">new</a> <a
href="VersionNegotiator.html">VersionNegotiator</a> object that logs to the
given logger instance.
</p>
</div>
<div class="sourcecode">
<p class="source-link">[ <a href="javascript:toggleSource('M000062_source')" id="l_M000062_source">show source</a> ]</p>
<div id="M000062_source" class="dyn-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/version-negotiator.rb, line 40</span>
40: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">initialize</span>( <span class="ruby-identifier">logger</span> )
41: <span class="ruby-ivar">@logger</span> = <span class="ruby-identifier">logger</span>
42: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div class="sectiontitle">Public Instance methods</div>
<div class="method">
<div class="title">
<a name="M000063"></a><b>negotiate</b>( socket, version )
</div>
<div class="description">
<p>
Negotiate version information over the given socket. This will return the
version reported by the server.
</p>
</div>
<div class="sourcecode">
<p class="source-link">[ <a href="javascript:toggleSource('M000063_source')" id="l_M000063_source">show source</a> ]</p>
<div id="M000063_source" class="dyn-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/version-negotiator.rb, line 46</span>
46: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">negotiate</span>( <span class="ruby-identifier">socket</span>, <span class="ruby-identifier">version</span> )
47: <span class="ruby-identifier">server_version</span> = <span class="ruby-value str">""</span>
48: <span class="ruby-ivar">@header_lines</span> = []
49:
50: <span class="ruby-identifier">loop</span> <span class="ruby-keyword kw">do</span>
51: <span class="ruby-identifier">server_version</span> = <span class="ruby-identifier">socket</span>.<span class="ruby-identifier">readline</span>
52: <span class="ruby-keyword kw">break</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">server_version</span>.<span class="ruby-identifier">nil?</span> <span class="ruby-operator">||</span> <span class="ruby-constant">VERSION_LINE</span>.<span class="ruby-identifier">match</span>( <span class="ruby-identifier">server_version</span> )
53: <span class="ruby-ivar">@header_lines</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">server_version</span>
54: <span class="ruby-keyword kw">end</span>
55:
56: <span class="ruby-keyword kw">if</span> <span class="ruby-operator">!</span><span class="ruby-constant">REQUIRED_VERSION_PATTERN</span>.<span class="ruby-identifier">match</span>( <span class="ruby-identifier">server_version</span> )
57: <span class="ruby-identifier">raise</span> <span class="ruby-constant">Net</span><span class="ruby-operator">::</span><span class="ruby-constant">SSH</span><span class="ruby-operator">::</span><span class="ruby-constant">Exception</span>,
58: <span class="ruby-node">"incompatible ssh version #{server_version.inspect}"</span>
59: <span class="ruby-keyword kw">end</span>
60:
61: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
62: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-node">"remote server is #{server_version.chomp.inspect}"</span>
63: <span class="ruby-keyword kw">end</span>
64: <span class="ruby-identifier">socket</span>.<span class="ruby-identifier">print</span> <span class="ruby-node">"#{version}\r\n"</span>
65:
66: <span class="ruby-keyword kw">return</span> <span class="ruby-identifier">server_version</span>.<span class="ruby-identifier">chomp</span>
67: <span class="ruby-keyword kw">end</span>
</pre>
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