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使用pcap库捕获数据包.html
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使用pcap库捕获数据包.html
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<h1 class="description center-align post-title">使用pcap库捕获数据包</h1>
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<h2 id="简述"><a href="#简述" class="headerlink" title="简述"></a>简述</h2><p>数据包捕获对数据包和网络问题分析很都用，一般情况下我们可以使用<br>tcpdump或者wireshark工具捕获进行。但是如果我们需要对数据包进行一些<br>其他的工作，比如数据监控、分析等，就需要自己捕获数据包后自行处理。</p>
<h2 id="依赖"><a href="#依赖" class="headerlink" title="依赖"></a>依赖</h2><p>系统环境</p>
<pre class="line-numbers language-shell" data-language="shell"><code class="language-shell">$ <span class="token function">uname</span> -a
Linux DESKTOP-L4NCHLS <span class="token number">5.10</span>.16.3-microsoft-standard-WSL2 <span class="token comment">#1 SMP Fri Apr 2 22:23:49 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>
<p>捕获数据包使用的是和tcpdump同款的pcap库。</p>
<p>安装pcap库:</p>
<pre class="line-numbers language-shell" data-language="shell"><code class="language-shell">$ <span class="token function">sudo</span> <span class="token function">apt</span> <span class="token function">install</span> libpcap-dev
$ dpkg -l libpcap-dev
<span class="token assign-left variable">Desired</span><span class="token operator">=</span>Unknown/Install/Remove/Purge/Hold
<span class="token operator">|</span> <span class="token assign-left variable">Status</span><span class="token operator">=</span>Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
<span class="token operator">|</span>/ Err?<span class="token operator">=</span><span class="token punctuation">(</span>none<span class="token punctuation">)</span>/Reinst-required <span class="token punctuation">(</span>Status,Err: <span class="token assign-left variable">uppercase</span><span class="token operator">=</span>bad<span class="token punctuation">)</span>
<span class="token operator">||</span>/ Name Version Architecture Description
+++-<span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">=</span>-<span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span>-<span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span>-<span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span><span class="token operator">==</span>
ii libpcap-dev:amd64 <span class="token number">1.9</span>.1-3 amd64 development library <span class="token keyword">for</span> libpcap <span class="token punctuation">(</span>transitional package<span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h2 id="实现"><a href="#实现" class="headerlink" title="实现"></a>实现</h2><p>使用pcap捕获数据包需要根据网卡设备名称打开对应的设备，<br>获取设备句柄，然后在对应的设备句柄上捕获数据包。</p>
<p>这里我使用一个类来封装以下pcap库对应的操作。类的结构为：</p>
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token keyword">class</span> <span class="token class-name">interface</span>
<span class="token punctuation">{</span>
<span class="token keyword">private</span><span class="token operator">:</span>
set<span class="token operator"><</span>string<span class="token operator">></span> dev_name<span class="token punctuation">;</span>
vector<span class="token operator"><</span>pcap_t<span class="token operator">*</span><span class="token operator">></span> dev_handles<span class="token punctuation">;</span>
<span class="token keyword">public</span><span class="token operator">:</span>
<span class="token function">interface</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token operator">~</span><span class="token function">interface</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token keyword">int</span> count<span class="token punctuation">,</span> pcap_handler func<span class="token punctuation">,</span> u_char<span class="token operator">*</span> args<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">print_dev</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p><code>dev_name</code>用于保存需要捕获数据包的网卡设备名称，<code>dev_handles</code>保存打开的设备句柄。</p>
<br>
在构造函数中进行初始化操作。首先使用`ifaddrs`相关接口遍历可用的网卡设备（即非环回设备，up状态和running状态）保存网卡名称。然后使用pcap库`pcap_open_live`函数根据网卡名称打开对应的设备，获取设备句柄。`pcap_setnonblock`的作用是将捕获模式设为非阻塞。
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token comment">// The interface is up, not a loopback and running?</span>
<span class="token keyword">bool</span> <span class="token function">up_running</span><span class="token punctuation">(</span><span class="token keyword">int</span> ifa_flags<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token operator">!</span><span class="token punctuation">(</span>ifa_flags <span class="token operator">&</span> IFF_LOOPBACK<span class="token punctuation">)</span> <span class="token operator">&&</span> <span class="token punctuation">(</span>ifa_flags <span class="token operator">&</span> IFF_UP<span class="token punctuation">)</span> <span class="token operator">&&</span>
<span class="token punctuation">(</span>ifa_flags <span class="token operator">&</span> IFF_RUNNING<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
interface<span class="token double-colon punctuation">::</span><span class="token function">interface</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">struct</span> <span class="token class-name">ifaddrs</span> <span class="token operator">*</span>ifaddr_list<span class="token punctuation">,</span> <span class="token operator">*</span>ifa<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">getifaddrs</span><span class="token punctuation">(</span><span class="token operator">&</span>ifaddr_list<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
std<span class="token double-colon punctuation">::</span>cout <span class="token operator"><<</span> <span class="token string">"failed to get interface addresses\n"</span><span class="token punctuation">;</span>
<span class="token keyword">return</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>ifa <span class="token operator">=</span> ifaddr_list<span class="token punctuation">;</span> ifa <span class="token operator">!=</span> <span class="token constant">NULL</span><span class="token punctuation">;</span> ifa <span class="token operator">=</span> ifa<span class="token operator">-></span>ifa_next<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ifa<span class="token operator">-></span>ifa_addr <span class="token operator">==</span> <span class="token constant">NULL</span> <span class="token operator">||</span> ifa<span class="token operator">-></span>ifa_netmask <span class="token operator">==</span> <span class="token constant">NULL</span><span class="token punctuation">)</span> <span class="token keyword">continue</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">up_running</span><span class="token punctuation">(</span>ifa<span class="token operator">-></span>ifa_flags<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">continue</span><span class="token punctuation">;</span>
dev_name<span class="token punctuation">.</span><span class="token function">insert</span><span class="token punctuation">(</span><span class="token function">string</span><span class="token punctuation">(</span>ifa<span class="token operator">-></span>ifa_name<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">freeifaddrs</span><span class="token punctuation">(</span>ifaddr_list<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>string i<span class="token operator">:</span>dev_name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
pcap_t<span class="token operator">*</span> dev_hanlde <span class="token operator">=</span>
<span class="token function">pcap_open_live</span><span class="token punctuation">(</span>i<span class="token punctuation">.</span><span class="token function">c_str</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token number">65535</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">,</span> errbuf<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>dev_hanlde<span class="token punctuation">)</span> <span class="token punctuation">{</span>
cout <span class="token operator"><<</span> <span class="token string">"open "</span> <span class="token operator"><<</span> i <span class="token operator"><<</span> <span class="token string">" failed.\n"</span><span class="token punctuation">;</span>
<span class="token keyword">continue</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">pcap_setnonblock</span><span class="token punctuation">(</span>dev_hanlde<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> errbuf<span class="token punctuation">)</span><span class="token punctuation">;</span>
dev_handles<span class="token punctuation">.</span><span class="token function">push_back</span><span class="token punctuation">(</span>dev_hanlde<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<br>
析构函数中只需要关闭打开的设备句柄即可。
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token class-name">interface</span><span class="token double-colon punctuation">::</span><span class="token operator">~</span><span class="token function">interface</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>pcap_t<span class="token operator">*</span> i<span class="token operator">:</span>dev_handles<span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token function">pcap_close</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<br>
添加一个无关紧要的设备名称打印函数。
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token keyword">void</span> interface<span class="token double-colon punctuation">::</span><span class="token function">print_dev</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>string i<span class="token operator">:</span>dev_name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
cout <span class="token operator"><<</span> i <span class="token operator"><<</span> endl<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<br>
最主要的是数据包捕获函数。捕获函数是对`pcap_dispatch`的简单封装。参数func是捕获数据包后的回调处理函数,也是我们自定义处理方式的地方。
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token keyword">typedef</span> <span class="token keyword">void</span> <span class="token punctuation">(</span><span class="token operator">*</span>pcap_cb<span class="token punctuation">)</span><span class="token punctuation">(</span>u_char<span class="token operator">*</span><span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">struct</span> <span class="token class-name">pcap_pkthdr</span><span class="token operator">*</span><span class="token punctuation">,</span> <span class="token keyword">const</span> u_char<span class="token operator">*</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> interface<span class="token double-colon punctuation">::</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token keyword">int</span> count<span class="token punctuation">,</span> pcap_handler func<span class="token punctuation">,</span> u_char<span class="token operator">*</span> args<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">int</span> ret<span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>pcap_t<span class="token operator">*</span> i<span class="token operator">:</span>dev_handles<span class="token punctuation">)</span><span class="token punctuation">{</span>
ret <span class="token operator">=</span> <span class="token function">pcap_dispatch</span><span class="token punctuation">(</span>i<span class="token punctuation">,</span> count<span class="token punctuation">,</span> func<span class="token punctuation">,</span> <span class="token punctuation">(</span>u_char<span class="token operator">*</span><span class="token punctuation">)</span>i<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ret <span class="token operator"><</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pcap_perror</span><span class="token punctuation">(</span>i<span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token keyword">char</span><span class="token operator">*</span><span class="token punctuation">)</span><span class="token string">"pcap_dispatch failed."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> ret<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<br>
这样之后，主函数就很简单，循环调用数据捕获函数就可以了。
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
interface in<span class="token punctuation">;</span>
in<span class="token punctuation">.</span><span class="token function">print_dev</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span> in<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">,</span> process_cb<span class="token punctuation">,</span> <span class="token keyword">nullptr</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<br>
后面比较重要的就是回调函数`process_cb`的实现。主要判断数据包的数据链路层类型。
这里只处理以太网类型的包。可以根据需要处理其他的类型。
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token comment">/**
* 第一个参数是 pcap_dispatch的最后一个参数，当收到足够数量的包后
* 会调用， 第二个参数是收到的数据包的pcap_pkthdr类型指针，
* 第三个参数是收到的数据包数据
*/</span>
<span class="token keyword">void</span> <span class="token function">process_cb</span><span class="token punctuation">(</span>u_char<span class="token operator">*</span> arg<span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">struct</span> <span class="token class-name">pcap_pkthdr</span><span class="token operator">*</span> pkthdr<span class="token punctuation">,</span>
<span class="token keyword">const</span> u_char<span class="token operator">*</span> packet<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
pcap_t<span class="token operator">*</span> handle <span class="token operator">=</span> <span class="token punctuation">(</span>pcap_t<span class="token operator">*</span><span class="token punctuation">)</span>arg<span class="token punctuation">;</span>
<span class="token keyword">switch</span> <span class="token punctuation">(</span><span class="token function">pcap_datalink</span><span class="token punctuation">(</span>handle<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">case</span> DLT_EN10MB<span class="token operator">:</span>
<span class="token function">ethernet_cb</span><span class="token punctuation">(</span>handle<span class="token punctuation">,</span> pkthdr<span class="token punctuation">,</span> packet<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> DLT_RAW<span class="token operator">:</span>
<span class="token keyword">case</span> DLT_NULL<span class="token operator">:</span>
<span class="token keyword">default</span><span class="token operator">:</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"Unknown linktype %d"</span><span class="token punctuation">,</span> <span class="token function">pcap_datalink</span><span class="token punctuation">(</span>handle<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<br>
在以太网数据包的回调函数中，继续判断数据包类型，这里只处理IP数据包。
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token keyword">void</span> <span class="token function">ethernet_cb</span><span class="token punctuation">(</span>pcap_t<span class="token operator">*</span> handle<span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">struct</span> <span class="token class-name">pcap_pkthdr</span><span class="token operator">*</span> pkthdr<span class="token punctuation">,</span>
<span class="token keyword">const</span> u_char<span class="token operator">*</span> packet<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">const</span> <span class="token keyword">struct</span> <span class="token class-name">ether_header</span><span class="token operator">*</span> ethernet <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">struct</span> <span class="token class-name">ether_header</span><span class="token operator">*</span><span class="token punctuation">)</span>packet<span class="token punctuation">;</span>
u_char<span class="token operator">*</span> payload <span class="token operator">=</span> <span class="token punctuation">(</span>u_char<span class="token operator">*</span><span class="token punctuation">)</span>packet <span class="token operator">+</span> <span class="token keyword">sizeof</span><span class="token punctuation">(</span><span class="token keyword">struct</span> <span class="token class-name">ether_header</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">uint16_t</span> protocol <span class="token operator">=</span> <span class="token function">ntohs</span><span class="token punctuation">(</span>ethernet<span class="token operator">-></span>ether_type<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">switch</span> <span class="token punctuation">(</span>protocol<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">case</span> ETHERTYPE_IP<span class="token operator">:</span>
<span class="token function">ip_cb</span><span class="token punctuation">(</span>handle<span class="token punctuation">,</span> pkthdr<span class="token punctuation">,</span> payload<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">default</span><span class="token operator">:</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<br>
在IP数据包处理函数中，输出IP的数据包的源地址和目的地址。然后根据需要处理TCP数据包。
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token keyword">void</span> <span class="token function">ip_cb</span><span class="token punctuation">(</span>pcap_t<span class="token operator">*</span> handle<span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">struct</span> <span class="token class-name">pcap_pkthdr</span><span class="token operator">*</span> pkthdr<span class="token punctuation">,</span>
<span class="token keyword">const</span> u_char<span class="token operator">*</span> packet<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">const</span> <span class="token keyword">struct</span> <span class="token class-name">ip</span><span class="token operator">*</span> ip <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">struct</span> <span class="token class-name">ip</span><span class="token operator">*</span><span class="token punctuation">)</span>packet<span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"------ ip connection ------\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">char</span><span class="token operator">*</span> srcIp <span class="token operator">=</span> <span class="token function">strdup</span><span class="token punctuation">(</span><span class="token function">inet_ntoa</span><span class="token punctuation">(</span>ip<span class="token operator">-></span>ip_src<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">char</span><span class="token operator">*</span> desIp <span class="token operator">=</span> <span class="token function">strdup</span><span class="token punctuation">(</span><span class="token function">inet_ntoa</span><span class="token punctuation">(</span>ip<span class="token operator">-></span>ip_dst<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"src ip:%s\tdest ip:%s\tid:%d\n"</span><span class="token punctuation">,</span> srcIp<span class="token punctuation">,</span> desIp<span class="token punctuation">,</span> ip<span class="token operator">-></span>ip_id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">free</span><span class="token punctuation">(</span>srcIp<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">free</span><span class="token punctuation">(</span>desIp<span class="token punctuation">)</span><span class="token punctuation">;</span>
u_char<span class="token operator">*</span> payload <span class="token operator">=</span> <span class="token punctuation">(</span>u_char<span class="token operator">*</span><span class="token punctuation">)</span>packet <span class="token operator">+</span> <span class="token keyword">sizeof</span><span class="token punctuation">(</span><span class="token keyword">struct</span> <span class="token class-name">ip</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">switch</span> <span class="token punctuation">(</span>ip<span class="token operator">-></span>ip_p<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">case</span> IPPROTO_TCP<span class="token operator">:</span>
<span class="token function">tcp_cb</span><span class="token punctuation">(</span>payload<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> IPPROTO_UDP<span class="token operator">:</span>
<span class="token comment">// udp_cb(payload);</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">default</span><span class="token operator">:</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"unsuport protocol %d\n"</span><span class="token punctuation">,</span> ip<span class="token operator">-></span>ip_p<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<br>
在TCP数据处理函数中简单输出数据包的端口号和一些标志位。
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token keyword">void</span> <span class="token function">tcp_cb</span><span class="token punctuation">(</span><span class="token keyword">const</span> u_char<span class="token operator">*</span> data<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">struct</span> <span class="token class-name">tcphdr</span><span class="token operator">*</span> tcp <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">struct</span> <span class="token class-name">tcphdr</span><span class="token operator">*</span><span class="token punctuation">)</span>data<span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"tcp src port=%d\tdist port=%d ack=%d fin=%d syn=%d\n"</span><span class="token punctuation">,</span>
<span class="token function">ntohs</span><span class="token punctuation">(</span>tcp<span class="token operator">-></span>source<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">ntohs</span><span class="token punctuation">(</span>tcp<span class="token operator">-></span>dest<span class="token punctuation">)</span><span class="token punctuation">,</span> tcp<span class="token operator">-></span>ack<span class="token punctuation">,</span> tcp<span class="token operator">-></span>fin<span class="token punctuation">,</span> tcp<span class="token operator">-></span>syn<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>tcp<span class="token operator">-></span>syn<span class="token punctuation">)</span> <span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"tcp connetion create !!!!!!!!!!!!!!!!!!!!!!!!!!!\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>tcp<span class="token operator">-></span>fin<span class="token punctuation">)</span> <span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"tcp connection close !!!!!!!!!!!!!!!!!!!!!!!!!!!\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h2 id="运行"><a href="#运行" class="headerlink" title="运行"></a>运行</h2><p>注意编译的时候需要连接pcap库。运行时需要超级管理员权限（操作网卡）。</p>
<pre class="line-numbers language-shell" data-language="shell"><code class="language-shell">$ g++ main.cc -lpcap
$ <span class="token function">sudo</span> ./a.out
eth0
------ <span class="token function">ip</span> connection ------
src ip:172.17.120.7 dest ip:172.17.112.1 id:5603
tcp src <span class="token assign-left variable">port</span><span class="token operator">=</span><span class="token number">43091</span> dist <span class="token assign-left variable">port</span><span class="token operator">=</span><span class="token number">53623</span> <span class="token assign-left variable">ack</span><span class="token operator">=</span><span class="token number">1</span> <span class="token assign-left variable">fin</span><span class="token operator">=</span><span class="token number">0</span> <span class="token assign-left variable">syn</span><span class="token operator">=</span><span class="token number">0</span>
------ <span class="token function">ip</span> connection ------
src ip:172.17.120.7 dest ip:172.17.112.1 id:30431
tcp src <span class="token assign-left variable">port</span><span class="token operator">=</span><span class="token number">43091</span> dist <span class="token assign-left variable">port</span><span class="token operator">=</span><span class="token number">62669</span> <span class="token assign-left variable">ack</span><span class="token operator">=</span><span class="token number">1</span> <span class="token assign-left variable">fin</span><span class="token operator">=</span><span class="token number">0</span> <span class="token assign-left variable">syn</span><span class="token operator">=</span><span class="token number">0</span>
------ <span class="token function">ip</span> connection ------
src ip:172.17.112.1 dest ip:172.17.120.7 id:49514
tcp src <span class="token assign-left variable">port</span><span class="token operator">=</span><span class="token number">62669</span> dist <span class="token assign-left variable">port</span><span class="token operator">=</span><span class="token number">43091</span> <span class="token assign-left variable">ack</span><span class="token operator">=</span><span class="token number">1</span> <span class="token assign-left variable">fin</span><span class="token operator">=</span><span class="token number">0</span> <span class="token assign-left variable">syn</span><span class="token operator">=</span><span class="token number">0</span>
<span class="token punctuation">..</span>. <span class="token punctuation">..</span>.<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h2 id="完整代码"><a href="#完整代码" class="headerlink" title="完整代码"></a>完整代码</h2><pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><arpa/inet.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><ifaddrs.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><net/ethernet.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><net/if.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><netinet/in.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><netinet/ip.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><netinet/ip6.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><netinet/tcp.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><netinet/udp.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><pcap.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><signal.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><sys/socket.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><cstdio></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><cstdlib></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><cstring></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><iostream></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><set></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><string></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><vector></span></span>
<span class="token keyword">using</span> <span class="token keyword">namespace</span> std<span class="token punctuation">;</span>
<span class="token keyword">char</span> errbuf<span class="token punctuation">[</span>PCAP_ERRBUF_SIZE<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">// The interface is up, not a loopback and running?</span>
<span class="token keyword">bool</span> <span class="token function">up_running</span><span class="token punctuation">(</span><span class="token keyword">int</span> ifa_flags<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token operator">!</span><span class="token punctuation">(</span>ifa_flags <span class="token operator">&</span> IFF_LOOPBACK<span class="token punctuation">)</span> <span class="token operator">&&</span> <span class="token punctuation">(</span>ifa_flags <span class="token operator">&</span> IFF_UP<span class="token punctuation">)</span> <span class="token operator">&&</span>
<span class="token punctuation">(</span>ifa_flags <span class="token operator">&</span> IFF_RUNNING<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">bool</span> <span class="token function">is_related</span><span class="token punctuation">(</span>string ip<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
vector<span class="token operator"><</span>string<span class="token operator">></span> ips<span class="token punctuation">;</span>
<span class="token keyword">struct</span> <span class="token class-name">ifaddrs</span> <span class="token operator">*</span>ifaddr_list<span class="token punctuation">,</span> <span class="token operator">*</span>ifa<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">getifaddrs</span><span class="token punctuation">(</span><span class="token operator">&</span>ifaddr_list<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
std<span class="token double-colon punctuation">::</span>cout <span class="token operator"><<</span> <span class="token string">"failed to get interface addresses"</span> <span class="token operator"><<</span> std<span class="token double-colon punctuation">::</span>endl<span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token number">1</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">char</span> local<span class="token punctuation">[</span>INET_ADDRSTRLEN<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">void</span><span class="token operator">*</span> tmpAddrPtr <span class="token operator">=</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>ifa <span class="token operator">=</span> ifaddr_list<span class="token punctuation">;</span> ifa <span class="token operator">!=</span> <span class="token constant">NULL</span><span class="token punctuation">;</span> ifa <span class="token operator">=</span> ifa<span class="token operator">-></span>ifa_next<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ifa<span class="token operator">-></span>ifa_addr <span class="token operator">==</span> <span class="token constant">NULL</span> <span class="token operator">||</span> ifa<span class="token operator">-></span>ifa_netmask <span class="token operator">==</span> <span class="token constant">NULL</span><span class="token punctuation">)</span> <span class="token keyword">continue</span><span class="token punctuation">;</span>
tmpAddrPtr <span class="token operator">=</span> <span class="token operator">&</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token keyword">struct</span> <span class="token class-name">sockaddr_in</span><span class="token operator">*</span><span class="token punctuation">)</span>ifa<span class="token operator">-></span>ifa_addr<span class="token punctuation">)</span><span class="token operator">-></span>sin_addr<span class="token punctuation">;</span>
<span class="token function">inet_ntop</span><span class="token punctuation">(</span>AF_INET<span class="token punctuation">,</span> tmpAddrPtr<span class="token punctuation">,</span> local<span class="token punctuation">,</span> INET_ADDRSTRLEN<span class="token punctuation">)</span><span class="token punctuation">;</span>
ips<span class="token punctuation">.</span><span class="token function">push_back</span><span class="token punctuation">(</span><span class="token function">string</span><span class="token punctuation">(</span>local<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">freeifaddrs</span><span class="token punctuation">(</span>ifaddr_list<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>vector<span class="token operator"><</span>string<span class="token operator">></span><span class="token double-colon punctuation">::</span>iterator it <span class="token operator">=</span> ips<span class="token punctuation">.</span><span class="token function">begin</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> it <span class="token operator">!=</span> ips<span class="token punctuation">.</span><span class="token function">end</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> it<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">*</span>it <span class="token operator">==</span> ip<span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">typedef</span> <span class="token keyword">void</span> <span class="token punctuation">(</span><span class="token operator">*</span>pcap_cb<span class="token punctuation">)</span><span class="token punctuation">(</span>u_char<span class="token operator">*</span><span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">struct</span> <span class="token class-name">pcap_pkthdr</span><span class="token operator">*</span><span class="token punctuation">,</span> <span class="token keyword">const</span> u_char<span class="token operator">*</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">interface</span>
<span class="token punctuation">{</span>
<span class="token keyword">private</span><span class="token operator">:</span>
set<span class="token operator"><</span>string<span class="token operator">></span> dev_name<span class="token punctuation">;</span>
vector<span class="token operator"><</span>pcap_t<span class="token operator">*</span><span class="token operator">></span> dev_handles<span class="token punctuation">;</span>
<span class="token keyword">public</span><span class="token operator">:</span>
<span class="token function">interface</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token operator">~</span><span class="token function">interface</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token keyword">int</span> count<span class="token punctuation">,</span> pcap_handler func<span class="token punctuation">,</span> u_char<span class="token operator">*</span> args<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">print_dev</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">tcp_cb</span><span class="token punctuation">(</span><span class="token keyword">const</span> u_char<span class="token operator">*</span> data<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">struct</span> <span class="token class-name">tcphdr</span><span class="token operator">*</span> tcp <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">struct</span> <span class="token class-name">tcphdr</span><span class="token operator">*</span><span class="token punctuation">)</span>data<span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"tcp src port=%d\tdist port=%d ack=%d fin=%d syn=%d\n"</span><span class="token punctuation">,</span>
<span class="token function">ntohs</span><span class="token punctuation">(</span>tcp<span class="token operator">-></span>source<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">ntohs</span><span class="token punctuation">(</span>tcp<span class="token operator">-></span>dest<span class="token punctuation">)</span><span class="token punctuation">,</span> tcp<span class="token operator">-></span>ack<span class="token punctuation">,</span> tcp<span class="token operator">-></span>fin<span class="token punctuation">,</span> tcp<span class="token operator">-></span>syn<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>tcp<span class="token operator">-></span>syn<span class="token punctuation">)</span> <span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"tcp connetion create !!!!!!!!!!!!!!!!!!!!!!!!!!!\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>tcp<span class="token operator">-></span>fin<span class="token punctuation">)</span> <span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"tcp connection close !!!!!!!!!!!!!!!!!!!!!!!!!!!\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">void</span> <span class="token function">udp_cb</span><span class="token punctuation">(</span><span class="token keyword">const</span> u_char<span class="token operator">*</span> data<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">struct</span> <span class="token class-name">udphdr</span><span class="token operator">*</span> udp <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">struct</span> <span class="token class-name">udphdr</span><span class="token operator">*</span><span class="token punctuation">)</span>data<span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"udp src port=%d\tdist port=%d\n"</span><span class="token punctuation">,</span> <span class="token function">ntohs</span><span class="token punctuation">(</span>udp<span class="token operator">-></span>source<span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token function">ntohs</span><span class="token punctuation">(</span>udp<span class="token operator">-></span>dest<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">void</span> <span class="token function">ip_cb</span><span class="token punctuation">(</span>pcap_t<span class="token operator">*</span> handle<span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">struct</span> <span class="token class-name">pcap_pkthdr</span><span class="token operator">*</span> pkthdr<span class="token punctuation">,</span>
<span class="token keyword">const</span> u_char<span class="token operator">*</span> packet<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">const</span> <span class="token keyword">struct</span> <span class="token class-name">ip</span><span class="token operator">*</span> ip <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">struct</span> <span class="token class-name">ip</span><span class="token operator">*</span><span class="token punctuation">)</span>packet<span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"------ ip connection ------\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">char</span><span class="token operator">*</span> srcIp <span class="token operator">=</span> <span class="token function">strdup</span><span class="token punctuation">(</span><span class="token function">inet_ntoa</span><span class="token punctuation">(</span>ip<span class="token operator">-></span>ip_src<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">char</span><span class="token operator">*</span> desIp <span class="token operator">=</span> <span class="token function">strdup</span><span class="token punctuation">(</span><span class="token function">inet_ntoa</span><span class="token punctuation">(</span>ip<span class="token operator">-></span>ip_dst<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"src ip:%s\tdest ip:%s\tid:%d\n"</span><span class="token punctuation">,</span> srcIp<span class="token punctuation">,</span> desIp<span class="token punctuation">,</span> ip<span class="token operator">-></span>ip_id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">free</span><span class="token punctuation">(</span>srcIp<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">free</span><span class="token punctuation">(</span>desIp<span class="token punctuation">)</span><span class="token punctuation">;</span>
u_char<span class="token operator">*</span> payload <span class="token operator">=</span> <span class="token punctuation">(</span>u_char<span class="token operator">*</span><span class="token punctuation">)</span>packet <span class="token operator">+</span> <span class="token keyword">sizeof</span><span class="token punctuation">(</span><span class="token keyword">struct</span> <span class="token class-name">ip</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">switch</span> <span class="token punctuation">(</span>ip<span class="token operator">-></span>ip_p<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">case</span> IPPROTO_TCP<span class="token operator">:</span>
<span class="token function">tcp_cb</span><span class="token punctuation">(</span>payload<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> IPPROTO_UDP<span class="token operator">:</span>
<span class="token comment">// udp_cb(payload);</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">default</span><span class="token operator">:</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"unsuport protocol %d\n"</span><span class="token punctuation">,</span> ip<span class="token operator">-></span>ip_p<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">void</span> <span class="token function">ethernet_cb</span><span class="token punctuation">(</span>pcap_t<span class="token operator">*</span> handle<span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">struct</span> <span class="token class-name">pcap_pkthdr</span><span class="token operator">*</span> pkthdr<span class="token punctuation">,</span>
<span class="token keyword">const</span> u_char<span class="token operator">*</span> packet<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">const</span> <span class="token keyword">struct</span> <span class="token class-name">ether_header</span><span class="token operator">*</span> ethernet <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">struct</span> <span class="token class-name">ether_header</span><span class="token operator">*</span><span class="token punctuation">)</span>packet<span class="token punctuation">;</span>
u_char<span class="token operator">*</span> payload <span class="token operator">=</span> <span class="token punctuation">(</span>u_char<span class="token operator">*</span><span class="token punctuation">)</span>packet <span class="token operator">+</span> <span class="token keyword">sizeof</span><span class="token punctuation">(</span><span class="token keyword">struct</span> <span class="token class-name">ether_header</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">uint16_t</span> protocol <span class="token operator">=</span> <span class="token function">ntohs</span><span class="token punctuation">(</span>ethernet<span class="token operator">-></span>ether_type<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">switch</span> <span class="token punctuation">(</span>protocol<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">case</span> ETHERTYPE_IP<span class="token operator">:</span>
<span class="token function">ip_cb</span><span class="token punctuation">(</span>handle<span class="token punctuation">,</span> pkthdr<span class="token punctuation">,</span> payload<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">default</span><span class="token operator">:</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token comment">/**
* 第一个参数是 pcap_dispatch的最后一个参数，当收到足够数量的包后
* 会调用， 第二个参数是收到的数据包的pcap_pkthdr类型指针，
* 第三个参数是收到的数据包数据
*/</span>
<span class="token keyword">void</span> <span class="token function">process_cb</span><span class="token punctuation">(</span>u_char<span class="token operator">*</span> arg<span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">struct</span> <span class="token class-name">pcap_pkthdr</span><span class="token operator">*</span> pkthdr<span class="token punctuation">,</span>
<span class="token keyword">const</span> u_char<span class="token operator">*</span> packet<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
pcap_t<span class="token operator">*</span> handle <span class="token operator">=</span> <span class="token punctuation">(</span>pcap_t<span class="token operator">*</span><span class="token punctuation">)</span>arg<span class="token punctuation">;</span>
<span class="token keyword">switch</span> <span class="token punctuation">(</span><span class="token function">pcap_datalink</span><span class="token punctuation">(</span>handle<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">case</span> DLT_EN10MB<span class="token operator">:</span>
<span class="token function">ethernet_cb</span><span class="token punctuation">(</span>handle<span class="token punctuation">,</span> pkthdr<span class="token punctuation">,</span> packet<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> DLT_RAW<span class="token operator">:</span>
<span class="token keyword">case</span> DLT_NULL<span class="token operator">:</span>
<span class="token keyword">default</span><span class="token operator">:</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"Unknown linktype %d"</span><span class="token punctuation">,</span> <span class="token function">pcap_datalink</span><span class="token punctuation">(</span>handle<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
interface in<span class="token punctuation">;</span>
in<span class="token punctuation">.</span><span class="token function">print_dev</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span> in<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">,</span> process_cb<span class="token punctuation">,</span> <span class="token keyword">nullptr</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
interface<span class="token double-colon punctuation">::</span><span class="token function">interface</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">struct</span> <span class="token class-name">ifaddrs</span> <span class="token operator">*</span>ifaddr_list<span class="token punctuation">,</span> <span class="token operator">*</span>ifa<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">getifaddrs</span><span class="token punctuation">(</span><span class="token operator">&</span>ifaddr_list<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
std<span class="token double-colon punctuation">::</span>cout <span class="token operator"><<</span> <span class="token string">"failed to get interface addresses"</span> <span class="token operator"><<</span> std<span class="token double-colon punctuation">::</span>endl<span class="token punctuation">;</span>
<span class="token keyword">return</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>ifa <span class="token operator">=</span> ifaddr_list<span class="token punctuation">;</span> ifa <span class="token operator">!=</span> <span class="token constant">NULL</span><span class="token punctuation">;</span> ifa <span class="token operator">=</span> ifa<span class="token operator">-></span>ifa_next<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ifa<span class="token operator">-></span>ifa_addr <span class="token operator">==</span> <span class="token constant">NULL</span> <span class="token operator">||</span> ifa<span class="token operator">-></span>ifa_netmask <span class="token operator">==</span> <span class="token constant">NULL</span><span class="token punctuation">)</span> <span class="token keyword">continue</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">up_running</span><span class="token punctuation">(</span>ifa<span class="token operator">-></span>ifa_flags<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">continue</span><span class="token punctuation">;</span>
dev_name<span class="token punctuation">.</span><span class="token function">insert</span><span class="token punctuation">(</span><span class="token function">string</span><span class="token punctuation">(</span>ifa<span class="token operator">-></span>ifa_name<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">freeifaddrs</span><span class="token punctuation">(</span>ifaddr_list<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>string i <span class="token operator">:</span> dev_name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
pcap_t<span class="token operator">*</span> dev_hanlde <span class="token operator">=</span> <span class="token function">pcap_open_live</span><span class="token punctuation">(</span>i<span class="token punctuation">.</span><span class="token function">c_str</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token number">65535</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">,</span> errbuf<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>dev_hanlde<span class="token punctuation">)</span> <span class="token punctuation">{</span>
cout <span class="token operator"><<</span> <span class="token string">"open "</span> <span class="token operator"><<</span> i <span class="token operator"><<</span> <span class="token string">" failed."</span> <span class="token operator"><<</span> endl<span class="token punctuation">;</span>
<span class="token keyword">continue</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">pcap_setnonblock</span><span class="token punctuation">(</span>dev_hanlde<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> errbuf<span class="token punctuation">)</span><span class="token punctuation">;</span>
dev_handles<span class="token punctuation">.</span><span class="token function">push_back</span><span class="token punctuation">(</span>dev_hanlde<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token class-name">interface</span><span class="token double-colon punctuation">::</span><span class="token operator">~</span><span class="token function">interface</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>pcap_t<span class="token operator">*</span> i <span class="token operator">:</span> dev_handles<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pcap_close</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">int</span> interface<span class="token double-colon punctuation">::</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token keyword">int</span> count<span class="token punctuation">,</span> pcap_handler func<span class="token punctuation">,</span> u_char<span class="token operator">*</span> args<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">int</span> ret<span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>pcap_t<span class="token operator">*</span> i <span class="token operator">:</span> dev_handles<span class="token punctuation">)</span> <span class="token punctuation">{</span>
ret <span class="token operator">=</span> <span class="token function">pcap_dispatch</span><span class="token punctuation">(</span>i<span class="token punctuation">,</span> count<span class="token punctuation">,</span> func<span class="token punctuation">,</span> <span class="token punctuation">(</span>u_char<span class="token operator">*</span><span class="token punctuation">)</span>i<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ret <span class="token operator"><</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pcap_perror</span><span class="token punctuation">(</span>i<span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token keyword">char</span><span class="token operator">*</span><span class="token punctuation">)</span><span class="token string">"pcap_dispatch failed."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> ret<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">void</span> interface<span class="token double-colon punctuation">::</span><span class="token function">print_dev</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>string i <span class="token operator">:</span> dev_name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
cout <span class="token operator"><<</span> i <span class="token operator"><<</span> endl<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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