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sysctl 系統內核函數sysctl 用於系統的檢測和控制，監控進程是否被附加或者調試(debug)。
定義定時器，每幾秒檢測一下app是否被附加(注入)..." />
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<h1 id="sysctl 系統內核函數">
sysctl 系統內核函數
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2020/12/01</span>
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<p> sysctl 系統內核函數</p>
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<h3 id="sysctl-系統內核函數"><a href="#sysctl-系統內核函數" class="headerlink" title="sysctl 系統內核函數"></a>sysctl 系統內核函數</h3><p>sysctl 用於系統的檢測和控制，監控進程是否被附加或者調試(debug)。</p>
<p>定義定時器，每幾秒檢測一下app是否被附加(注入)。</p>
<figure class="highlight plain"><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><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line">// 定時器輪詢查詢app是否被調試，每秒鐘檢查一次</span><br><span class="line">static dispatch_source_t timer;</span><br><span class="line"></span><br><span class="line">BOOL isDebugger() {</span><br><span class="line"> int name[4];</span><br><span class="line"> name[0] = CTL_KERN; // 內核</span><br><span class="line"> name[1] = KERN_PROC; // 查詢進程</span><br><span class="line"> name[2] = KERN_PROC_PID; // 通過進程ID查詢</span><br><span class="line"> name[3] = getpid(); // 獲取進程ID</span><br><span class="line"> </span><br><span class="line"> struct kinfo_proc info; // 進程查詢結果的結構體</span><br><span class="line"> size_t info_size = sizeof(info); // 結構體大小</span><br><span class="line"> </span><br><span class="line"> int error = sysctl(name, sizeof(name)/sizeof(*name), &info, &info_size, 0, 0);</span><br><span class="line"> </span><br><span class="line"> assert(error == 0); // 0就是沒有錯誤，其他就是錯誤碼</span><br><span class="line"> </span><br><span class="line"> // (info.kp_proc.p_flag & P_TRACED) != 0; // 0沒有調試 !=0有調試</span><br><span class="line"> </span><br><span class="line"> return ((info.kp_proc.p_flag & P_TRACED) != 0);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">+ (void)load {</span><br><span class="line"> timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, dispatch_get_global_queue(0, 0));</span><br><span class="line"> dispatch_source_set_timer(timer, DISPATCH_TIME_NOW, 1 * NSEC_PER_SEC, 0 * NSEC_PER_SEC);</span><br><span class="line"> dispatch_source_set_event_handler(timer, ^{</span><br><span class="line"> if (isDebugger()) {</span><br><span class="line"> exit(0);</span><br><span class="line"> }</span><br><span class="line"> });</span><br><span class="line"> dispatch_resume(timer);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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