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<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><a href="/pages/1ab20b/" class="sidebar-link">个人赞赏</a></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading open"><span>贡献指南</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/pages/a3f096/" class="sidebar-link">如何贡献</a></li><li><a href="/pages/2f674a/" class="sidebar-link">项目结构</a></li><li><a href="/pages/dd027d/" aria-current="page" class="active sidebar-link">实现原理</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/pages/dd027d/#指令通道-cmdchannel" class="sidebar-link">指令通道(CmdChannel)</a></li><li class="sidebar-sub-header level2"><a href="/pages/dd027d/#用户访问通道-visitorchannel" class="sidebar-link">用户访问通道(VisitorChannel)</a></li><li class="sidebar-sub-header level2"><a href="/pages/dd027d/#被代理服务的实际通道-realserverchannel" class="sidebar-link">被代理服务的实际通道(RealServerChannel)</a></li><li class="sidebar-sub-header level2"><a href="/pages/dd027d/#代理数据传输的通道-proxychannel" class="sidebar-link">代理数据传输的通道(ProxyChannel)</a></li><li class="sidebar-sub-header level2"><a href="/pages/dd027d/#_1、服务连接阶段" class="sidebar-link">1、服务连接阶段</a></li><li class="sidebar-sub-header level2"><a href="/pages/dd027d/#_2、用户连接阶段" class="sidebar-link">2、用户连接阶段</a></li><li class="sidebar-sub-header level2"><a href="/pages/dd027d/#_3、实际被代理服务连接阶段" class="sidebar-link">3、实际被代理服务连接阶段</a></li><li class="sidebar-sub-header level2"><a href="/pages/dd027d/#_4、代理通道连接阶段" class="sidebar-link">4、代理通道连接阶段</a></li><li class="sidebar-sub-header level2"><a href="/pages/dd027d/#_5、数据传输阶段" class="sidebar-link">5、数据传输阶段</a></li></ul></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>赞赏公示</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/pages/acdf0a/" class="sidebar-link">2024年</a></li><li><a href="/pages/cded59/" class="sidebar-link">2023年</a></li></ul></section></li></ul> </aside> <div><main class="page"><div class="theme-vdoing-wrapper "><div class="placeholder"></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="data:image/png;base64,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">实现原理<!----></h1> <div class="page-slot page-slot-top">
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</div> <div class="theme-vdoing-content content__default"><h1 id="代理实现中涉及的几类channel"><a href="#代理实现中涉及的几类channel" class="header-anchor">#</a> 代理实现中涉及的几类Channel</h1> <h2 id="指令通道-cmdchannel"><a href="#指令通道-cmdchannel" class="header-anchor">#</a> 指令通道(CmdChannel)</h2> <ul><li>该channel负责维护客户端与服务端之间的指令通讯，由客户端启动后向服务端发起连接请求，服务端验证license成功后连接建立。</li> <li>服务端维护第一个CmdChannel的映射表，key为licenseId。服务端可以根据licenseId，向指定的客户端指令通道发布指令。</li> <li>该通道建立完成后，服务端会将该license授权的外网映射端口打开，等待用户访问。正常情况下，只要客户端不下线，该通道一直可用。</li> <li>然后服务端维护第二个CmdChannel的映射表，key为服务端外网端口。服务端可以根据指定的外网端口，向指定的客户端指令通道发布指令。</li></ul> <h2 id="用户访问通道-visitorchannel"><a href="#用户访问通道-visitorchannel" class="header-anchor">#</a> 用户访问通道(VisitorChannel)</h2> <ul><li>该channel负责维护访问者与服务端端口之间的通讯，由访问者向服务端映射的外网端口发起请求开始建立，具体断开时机由实际的被代理的
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协议决定。</li> <li>如HTTP/1.0下，用户向该端口发起请求，响应结束后，该通道随之关闭，下一次发起请求后，重新建立新的连接。</li> <li>该连接建立后，服务端会向该外网端口映射的指令通道发送<code>Connect</code>指令,传输该外网端口需要代理的内网信息，
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如：<code>127.0.0.1:3306</code>。</li></ul> <h2 id="被代理服务的实际通道-realserverchannel"><a href="#被代理服务的实际通道-realserverchannel" class="header-anchor">#</a> 被代理服务的实际通道(RealServerChannel)</h2> <ul><li>该channel负责维护客户端与实际被代理服务之间的通讯，当客户端接收到服务端的<code>Connect</code>指令后，客户端便会建立该通道。</li></ul> <h2 id="代理数据传输的通道-proxychannel"><a href="#代理数据传输的通道-proxychannel" class="header-anchor">#</a> 代理数据传输的通道(ProxyChannel)</h2> <ul><li>该channel负责完成内网被代理服务与代理服务端之间的数据转发任务。</li> <li>每个客户端维护一个<code>ProxyChannel</code>的缓存队列，需要时从该队列中取，当取不到时，直接新建一个<code>ProxyChannel</code>返回。
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当一个<code>ProxyChannel</code>实例用完后，需要归还到缓存队列中(<code>ProxyChannel</code>收到<code>DisConnect</code>指令时)。</li> <li>当<code>RealServerChannel</code>建立完成后，就会获取相关联的<code>ProxyChannel</code>,并与其绑定。设置<code>RealServerChannel</code>为
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可读状态。然后通过<code>ProxyChannel</code>向服务端发送<code>Connect</code>指令。</li></ul> <h1 id="代理实现流程"><a href="#代理实现流程" class="header-anchor">#</a> 代理实现流程</h1> <h2 id="_1、服务连接阶段"><a href="#_1、服务连接阶段" class="header-anchor">#</a> 1、服务连接阶段</h2> <ul><li>1.1、客户端根据是否需要使用SSL，选择对应的服务端端口发起连接，建立<code>CmdChannel</code>。</li> <li>1.2、客户端根据用户输入或配置文件获取<code>license</code>,并携带<code>license</code>通过<code>CmdChannel</code>向服务端发送<code>Auth</code>指令。</li> <li>1.3、服务端通过<code>CmdChannel</code>接收到来自客户端的<code>Auth</code>指令。若验证<code>license</code>有效，则建立<code>licenseId</code>与<code>CmdChannel</code>的映射缓存、
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外网端口与<code>CmdChannel</code>的映射缓存。并启动服务端代理端口，等待用户连接。</li></ul> <h2 id="_2、用户连接阶段"><a href="#_2、用户连接阶段" class="header-anchor">#</a> 2、用户连接阶段</h2> <ul><li>2.1、用户向服务端代理的外网端口发起请求，服务端建立<code>VisitorChannel</code>。</li> <li>2.2、根据外网端口查找<code>CmdChannel</code>，若不存在有效的<code>CmdChannel</code>，则关闭该<code>VisitorChannel</code>。否则，
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设置<code>VisitorChannel</code>为不可读，并携带内网映射信息(如：<code>127.0.0.1:3306</code>)通过<code>CmdChannel</code>向客户端发送<code>Connect</code>指令。</li></ul> <h2 id="_3、实际被代理服务连接阶段"><a href="#_3、实际被代理服务连接阶段" class="header-anchor">#</a> 3、实际被代理服务连接阶段</h2> <ul><li>3.1、客户端通过<code>CmdChannel</code>接收到服务端的<code>Connect</code>指令。拿到需要代理的内网IP、端口号，向实际被
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代理服务发起连接请求，若连接失败，则通过<code>CmdChannel</code>向服务端发送<code>DisConnect</code>指令。建立<code>RealServerChannel</code>成功，设置<code>RealServerChannel</code>为不可读
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||
状态，并进入4.1阶段</li></ul> <h2 id="_4、代理通道连接阶段"><a href="#_4、代理通道连接阶段" class="header-anchor">#</a> 4、代理通道连接阶段</h2> <ul><li>4.1、客户端通过<code>ProxyChannelQueue</code>获取或新建一个<code>ProxyChannel</code>，并将<code>RealServerChannel</code>与<code>ProxyChannel</code>进行绑定。</li> <li>4.2、客户端通过<code>ProxyChannel</code>向服务端发送<code>Connect</code>指令。</li> <li>4.3、服务端通过<code>ProxyChannel</code>通道收到来自客户端的<code>Connect</code>指令后，将<code>ProxyChannel</code>与对应的<code>VisitorChannel</code>进行绑定，并
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||
设置<code>VisitorChannel</code>为可读状态。</li></ul> <h2 id="_5、数据传输阶段"><a href="#_5、数据传输阶段" class="header-anchor">#</a> 5、数据传输阶段</h2> <ul><li>5.1、服务端通过<code>VisitorChannel</code>收到来自用户的请求数据，然后找到<code>VisitorChannel</code>绑定的<code>ProxyChannel</code>，
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||
通过<code>ProxyChannel</code>发送<code>Transfer</code>指令，并携带用户请求数据。</li> <li>5.2、客户端通过<code>ProxyChannel</code>收到来自服务端的<code>Transfer</code>指令，取出用户请求数据。找到<code>ProxyChannel</code>绑定的<code>RealServerChannel</code>,
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||
通过<code>RealServerChannel</code>向被代理服务写入用户请求数据。</li> <li>5.3、客户端通过<code>RealServerChannel</code>收到被代理服务响应的数据，找到<code>RealServerChannel</code>绑定的<code>ProxyChannel</code>，
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||
通过<code>ProxyChannel</code>向服务端发送<code>Transfer</code>指令，并携带响应数据。</li> <li>5.4、服务端通过<code>ProxyChannel</code>收到来自客户端的<code>Transfer</code>指令，找到<code>ProxyChannel</code>绑定的<code>VisitorChannel</code>，
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