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<a class="post-title-link" href="/posts/73ea24f2/" itemprop="url">利用rip寄存器实现循环</a></h1>
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<p>想要循环调用一个函数，其实有很多种方法，除了以下常见实现方式（for ,while），还可以通过修改rip寄存器来实现循环，文章末尾会介绍具体的案例。</p>
<h2 id="常见循环实现"><a href="#常见循环实现" class="headerlink" title="常见循环实现"></a>常见循环实现</h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. for</span></span><br><span class="line"><span class="keyword">for</span> (;;) {</span><br><span class="line"> loop();</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">// 2. while</span></span><br><span class="line"><span class="keyword">while</span> (<span class="literal">true</span>) {</span><br><span class="line"> loop();</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">// 3. do while</span></span><br><span class="line"><span class="keyword">do</span> {</span><br><span class="line"> loop();</span><br><span class="line">} <span class="keyword">while</span> (<span class="literal">true</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 4. goto</span></span><br><span class="line">label:</span><br><span class="line"> loop();</span><br><span class="line"> <span class="keyword">goto</span> label;</span><br></pre></td></tr></table></figure>
<h2 id="rip实现循环"><a href="#rip实现循环" class="headerlink" title="rip实现循环"></a>rip实现循环</h2><p>先来看一段代码</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// loop.c</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><stdio.h></span></span></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">loop</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">long</span> i = <span class="number">111</span>;</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"in loop: %p\n"</span>, &i);</span><br><span class="line"> <span class="comment">// 关键代码</span></span><br><span class="line"> *(&i+<span class="number">2</span>) -= <span class="number">5</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">(<span class="keyword">int</span> argc, <span class="keyword">char</span>* argv[])</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">long</span> i = <span class="number">110</span>;</span><br><span class="line"> loop();</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"before loop: %p\n"</span>, &i);</span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#</span><span class="bash"> 执行</span></span><br><span class="line"><span class="meta">$</span><span class="bash"> clang loop.c</span></span><br><span class="line"><span class="meta">$</span><span class="bash"> ./a.out</span></span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">in loop: 0x7ffee225f848</span><br><span class="line">^C</span><br></pre></td></tr></table></figure>
<p>为什么会出现这种效果？让我们先了解一下程序的执行过程。</p>
<h3 id="运行时栈"><a href="#运行时栈" class="headerlink" title="运行时栈"></a>运行时栈</h3><p>main函数中调用loop，调用堆栈如下图所示：<br><img src="https://i.loli.net/2019/12/24/Orp843FZzL5yIoY.jpg" alt="stack _1_.jpg"><br>在main函数的栈帧中可以看到，会将loop函数（例子中没有参数）参数入栈，随后保存PC（即main中printf的地址）。通过call指令实现将PC值push到栈中，并将PC设置为loop函数的地址。loop执行后调用ret指令，从栈中保存的返回地址恢复到PC中，从而main函数继续执行。</p>
<blockquote>
<p>PC (program counter), 程序计数器，在x86-64中，用%rip寄存器表示。<br>The instruction pointer register points to the memory address which the processor will next attempt to execute.</p>
</blockquote>
<h3 id="反汇编"><a href="#反汇编" class="headerlink" title="反汇编"></a>反汇编</h3><p>现在我们大致了解了程序执行时栈的变化过程，要想实现loop函数循环，只要将saved PC在栈中的值改为loop()这条指令的地址。接下来，让我们看看a.out的关键部分的反汇编代码。</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#</span><span class="bash"> objdump反汇编a.out</span></span><br><span class="line"><span class="meta">$</span><span class="bash"> objdump -D a.out > a.obj</span></span><br></pre></td></tr></table></figure>
<p><img src="https://i.loli.net/2019/12/24/FD198mlPCnTcBjS.png" alt="反汇编.png"></p>
<p>27行汇编 callq调用loop的时候，会将下一条指令（leaq）的地址写入栈中，同时将PC设置为loop的地址，实现调用loop的效果，callq和leaq的地址相差5，在loop函数中，我们可以通过变量i来寻找saved PC的在栈中的地址，从来达到loop返回后，继续执行loop的效果。</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"># &i+<span class="number">2</span>是saved PC的地址</span><br><span class="line"># 只要将栈中的数据改为callq的地址即可</span><br><span class="line">*(&i+<span class="number">2</span>) -= <span class="number">5</span>;</span><br></pre></td></tr></table></figure>
<h2 id="案例-go-defer实现"><a href="#案例-go-defer实现" class="headerlink" title="案例-go defer实现"></a>案例-go defer实现</h2><p>在函数ret之前，调用deferreturn，deferreturn会循环调用，检查defer函数是否全部调用完成。</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line">runtime.jmpdefer:</span><br><span class="line"> <span class="number">104f</span>890: <span class="number">48</span> <span class="number">8b</span> <span class="number">54</span> <span class="number">24</span> <span class="number">08</span> movq <span class="number">8</span>(%rsp), %rdx</span><br><span class="line"> <span class="number">104f</span>895: <span class="number">48</span> <span class="number">8b</span> <span class="number">5</span>c <span class="number">24</span> <span class="number">10</span> movq <span class="number">16</span>(%rsp), %rbx</span><br><span class="line"> <span class="number">104f</span>89a: <span class="number">48</span> <span class="number">8</span>d <span class="number">63</span> f8 leaq <span class="number">-8</span>(%rbx), %rsp</span><br><span class="line"> <span class="number">104f</span>89e: <span class="number">48</span> <span class="number">8b</span> <span class="number">6</span>c <span class="number">24</span> f8 movq <span class="number">-8</span>(%rsp), %rbp</span><br><span class="line"> <span class="number">104f</span>8a3: <span class="number">48</span> <span class="number">83</span> <span class="number">2</span>c <span class="number">24</span> <span class="number">05</span> subq $<span class="number">5</span>, (%rsp) <span class="comment">// 修改saved PC</span></span><br><span class="line"> 104f8a8: 48 8b 1a movq (%rdx), %rbx</span><br><span class="line"> <span class="number">104f</span>8ab: ff e3 jmpq *%rbx</span><br><span class="line"> <span class="number">104f</span>8ad: cc int3</span><br><span class="line"> <span class="number">104f</span>8ae: cc int3</span><br><span class="line"> <span class="number">104f</span>8af: cc int3</span><br><span class="line"></span><br><span class="line">runtime.deferreturn:</span><br><span class="line"> <span class="number">10264</span>a0: <span class="number">48</span> <span class="number">83</span> ec <span class="number">48</span> subq $<span class="number">72</span>, %rsp</span><br><span class="line"> <span class="number">10264</span>a4: <span class="number">48</span> <span class="number">89</span> <span class="number">6</span>c <span class="number">24</span> <span class="number">40</span> movq %rbp, <span class="number">64</span>(%rsp)</span><br><span class="line"> <span class="number">10264</span>a9: <span class="number">48</span> <span class="number">8</span>d <span class="number">6</span>c <span class="number">24</span> <span class="number">40</span> leaq <span class="number">64</span>(%rsp), %rbp</span><br><span class="line"> <span class="number">10264</span>ae: <span class="number">65</span> <span class="number">48</span> <span class="number">8b</span> <span class="number">04</span> <span class="number">25</span> a0 <span class="number">08</span> <span class="number">00</span> <span class="number">00</span> movq %gs:<span class="number">2208</span>, %rax</span><br><span class="line"> <span class="number">10264b</span>7: <span class="number">48</span> <span class="number">8b</span> <span class="number">48</span> <span class="number">28</span> movq <span class="number">40</span>(%rax), %rcx</span><br><span class="line"> ...</span><br><span class="line"> <span class="number">1026534</span>: <span class="number">48</span> <span class="number">8</span>d <span class="number">44</span> <span class="number">24</span> <span class="number">50</span> leaq <span class="number">80</span>(%rsp), %rax</span><br><span class="line"> <span class="number">1026539</span>: <span class="number">48</span> <span class="number">89</span> <span class="number">44</span> <span class="number">24</span> <span class="number">38</span> movq %rax, <span class="number">56</span>(%rsp)</span><br><span class="line"> <span class="number">102653</span>e: <span class="number">48</span> <span class="number">8b</span> <span class="number">44</span> <span class="number">24</span> <span class="number">20</span> movq <span class="number">32</span>(%rsp), %rax</span><br><span class="line"> <span class="number">1026543</span>: <span class="number">48</span> <span class="number">89</span> <span class="number">04</span> <span class="number">24</span> movq %rax, (%rsp)</span><br><span class="line"> <span class="number">1026547</span>: <span class="number">48</span> <span class="number">8b</span> <span class="number">44</span> <span class="number">24</span> <span class="number">38</span> movq <span class="number">56</span>(%rsp), %rax</span><br><span class="line"> <span class="number">102654</span>c: <span class="number">48</span> <span class="number">89</span> <span class="number">44</span> <span class="number">24</span> <span class="number">08</span> movq %rax, <span class="number">8</span>(%rsp)</span><br><span class="line"> <span class="number">1026551</span>: e8 <span class="number">3</span>a <span class="number">93</span> <span class="number">02</span> <span class="number">00</span> callq <span class="number">168762</span> <runtime.jmpdefer></span><br><span class="line"> <span class="number">1026556</span>: <span class="number">48</span> <span class="number">8b</span> <span class="number">6</span>c <span class="number">24</span> <span class="number">40</span> movq <span class="number">64</span>(%rsp), %rbp</span><br><span class="line"> <span class="number">102655b</span>: <span class="number">48</span> <span class="number">83</span> c4 <span class="number">48</span> addq $<span class="number">72</span>, %rsp</span><br><span class="line"> <span class="number">102655f</span>: c3 retq</span><br><span class="line"> ...</span><br></pre></td></tr></table></figure>
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<p>平时在用go get命令下载依赖时，经常会遇到类似</p>
<blockquote>
<p>package google.golang.org/grpc/encoding/gzip: unrecognized import path “google.golang.org/grpc/encoding/gzip” (https fetch: Get <a href="https://google.golang.org/grpc/encoding/gzip?go-get=1" target="_blank" rel="external">https://google.golang.org/grpc/encoding/gzip?go-get=1</a>: dial tcp 216.239.37.1:443: i/o timeout)</p>
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<p>的问题，其实是这些资源被墙，所幸的是有很多使用代理的方式解决了这个问题。</p>
<p>以<em>google.golang.org/grpc/encoding/gzip</em>为例：</p>
<h2 id="设置git代理"><a href="#设置git代理" class="headerlink" title="设置git代理"></a>设置git代理</h2><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">$</span><span class="bash"> git config [--global] http.proxy http://proxy.example.com:port</span></span><br><span class="line"><span class="meta">$</span><span class="bash"> go get <span class="string">"google.golang.org/grpc/encoding/gzip"</span></span></span><br></pre></td></tr></table></figure>
<h2 id="shell环境变量"><a href="#shell环境变量" class="headerlink" title="shell环境变量"></a>shell环境变量</h2><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#</span><span class="bash"> socks</span></span><br><span class="line">http_proxy=socks5://127.0.0.1:1080 go get "google.golang.org/grpc/encoding/zip"</span><br><span class="line"><span class="meta">#</span><span class="bash"> http</span></span><br><span class="line">http_proxy=http://127.0.0.1:1080 go get "google.golang.org/grpc/encoding/gzip"</span><br></pre></td></tr></table></figure>
<h2 id="VPN"><a href="#VPN" class="headerlink" title="VPN"></a>VPN</h2><p>那就直接<em>go get “google.golang.org/grpc/encoding/gzip”</em>吧</p>
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<p>在知乎闲逛时看到某回答中有个”<strong>佛祖保佑，永无BUG</strong>“的注释，便想着何不在登陆linux时可以显示出来，并且加上金光闪闪的颜色。</p>
<p>修改/etc/motd文件，加入如下内容：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line">^[[1;33m[1;01m[1;05m</span><br><span class="line"> _ooOoo_</span><br><span class="line"> o8888888o</span><br><span class="line"> 88" . "88</span><br><span class="line"> (| -_- |)</span><br><span class="line"> O\ = /O</span><br><span class="line"> ____/`---'\____</span><br><span class="line"> .' \\| |// `.</span><br><span class="line"> / \\||| : |||// \</span><br><span class="line"> / _||||| -:- |||||- \</span><br><span class="line"> | | \\\ - /// | |</span><br><span class="line"> | \_| ''\---/'' | |</span><br><span class="line"> \ .-\__ `-` ___/-. /</span><br><span class="line"> ___`. .' /--.--\ `. . __</span><br><span class="line"> ."" '< `.___\_<|>_/___.' >'"".</span><br><span class="line"> | | : `- \`.;`\ _ /`;.`/ - ` : | |</span><br><span class="line"> \ \ `-. \_ __\ /__ _/ .-` / /</span><br><span class="line"> ======`-.____`-.___\_____/___.-`____.-'======</span><br><span class="line"> `=---='</span><br><span class="line"> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^</span><br><span class="line"> 佛祖保佑 永无BUG</span><br><span class="line"> 佛曰:</span><br><span class="line"> 写字楼里写字间，写字间里程序员；</span><br><span class="line"> 程序人员写程序，又拿程序换酒钱。</span><br><span class="line"> 酒醒只在网上坐，酒醉还来网下眠；</span><br><span class="line"> 酒醉酒醒日复日，网上网下年复年。</span><br><span class="line"> 但愿老死电脑间，不愿鞠躬老板前；</span><br><span class="line"> 奔驰宝马贵者趣，公交自行程序员。</span><br><span class="line"> 别人笑我忒疯癫，我笑自己命太贱；</span><br><span class="line"> 不见满街漂亮妹，哪个归得程序员？</span><br><span class="line">^[[1;0m</span><br></pre></td></tr></table></figure>
<p>效果图：<br><img src="http://p2dvxr53o.bkt.clouddn.com/fozubaoyou.gif" alt="fozubaoyou"></p>
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$('body').css('overflow', '');
proceedsearch();
}
});
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e.stopPropagation();
if (isfetched === false) {
searchFunc(path, 'local-search-input', 'local-search-result');
} else {
proceedsearch();
};
});
$('.popup-btn-close').click(onPopupClose);
$('.popup').click(function(e){
e.stopPropagation();
});
$(document).on('keyup', function (event) {
var shouldDismissSearchPopup = event.which === 27 &&
$('.search-popup').is(':visible');
if (shouldDismissSearchPopup) {
onPopupClose();
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});
</script>
<script src="https://cdn1.lncld.net/static/js/av-core-mini-0.6.4.js"></script>
<script>AV.initialize("rWbiTXM1MYp1GbHl8Ev3jclR-gzGzoHsz", "mD63QNYhx0zL1D6XDvt7LKWX");</script>
<script>
function showTime(Counter) {
var query = new AV.Query(Counter);
var entries = [];
var $visitors = $(".leancloud_visitors");
$visitors.each(function () {
entries.push( $(this).attr("id").trim() );
});
query.containedIn('url', entries);
query.find()
.done(function (results) {
var COUNT_CONTAINER_REF = '.leancloud-visitors-count';
if (results.length === 0) {
$visitors.find(COUNT_CONTAINER_REF).text(0);
return;
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for (var i = 0; i < results.length; i++) {
var item = results[i];
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}
})
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});
}
function addCount(Counter) {
var $visitors = $(".leancloud_visitors");
var url = $visitors.attr('id').trim();
var title = $visitors.attr('data-flag-title').trim();
var query = new AV.Query(Counter);
query.equalTo("url", url);
query.find({
success: function(results) {
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counter.fetchWhenSave(true);
counter.increment("time");
counter.save(null, {
success: function(counter) {
var $element = $(document.getElementById(url));
$element.find('.leancloud-visitors-count').text(counter.get('time'));
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error: function(counter, error) {
console.log('Failed to save Visitor num, with error message: ' + error.message);
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acl.setPublicReadAccess(true);
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newcounter.set("url", url);
newcounter.set("time", 1);
newcounter.save(null, {
success: function(newcounter) {
var $element = $(document.getElementById(url));
$element.find('.leancloud-visitors-count').text(newcounter.get('time'));
},
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console.log('Failed to create');
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$(function() {
var Counter = AV.Object.extend("Counter");
if ($('.leancloud_visitors').length == 1) {
addCount(Counter);
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Whois info of domain
Domain Name: GO0X.COM
Registry Domain ID: 2198579307_DOMAIN_COM-VRSN
Registrar WHOIS Server: grs-whois.hichina.com
Registrar URL: http://www.net.cn
Updated Date: 2024-11-26T01:54:01Z
Creation Date: 2017-12-11T05:51:53Z
Registry Expiry Date: 2025-12-11T05:51:53Z
Registrar: Alibaba Cloud Computing (Beijing) Co., Ltd.
Registrar IANA ID: 420
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: +86.95187
Domain Status: ok https://icann.org/epp#ok
Name Server: DNS11.HICHINA.COM
Name Server: DNS12.HICHINA.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2025-05-03T00:09:28Z <<<
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