WireGuard for MacOS (#248)

* WireGuard for MacOS
* Fix openvpn block-outside-dns

client/mozilla/shared/signalhandler.cpp

@@ -0,0 +1,76 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "signalhandler.h"
+
+#include <fcntl.h>
+#include <signal.h>
+#include <unistd.h>
+
+#include "logger.h"
+
+namespace {
+
+Logger logger("SignalHandler");
+
+int s_signalpipe = -1;
+
+}  // namespace
+
+SignalHandler::SignalHandler() {
+  Q_ASSERT(s_signalpipe < 0);
+
+  int quitSignals[] = {SIGQUIT, SIGINT, SIGTERM, SIGHUP};
+
+  sigset_t mask;
+  sigemptyset(&mask);
+  for (auto sig : quitSignals) {
+    sigaddset(&mask, sig);
+  }
+
+  if (pipe(m_pipefds) != 0) {
+    logger.error() << "Unable to create signal wakeup pipe";
+    return;
+  }
+  fcntl(m_pipefds[0], F_SETFL, fcntl(m_pipefds[0], F_GETFL) | O_NONBLOCK);
+  s_signalpipe = m_pipefds[1];
+  m_notifier = new QSocketNotifier(m_pipefds[0], QSocketNotifier::Read, this);
+  connect(m_notifier, &QSocketNotifier::activated, this,
+          &SignalHandler::pipeReadReady);
+
+  struct sigaction sa;
+  sa.sa_handler = SignalHandler::saHandler;
+  sa.sa_mask = mask;
+  sa.sa_flags = 0;
+
+  for (auto sig : quitSignals) {
+    sigaction(sig, &sa, nullptr);
+  }
+}
+
+SignalHandler::~SignalHandler() {
+  s_signalpipe = -1;
+  if (m_pipefds[0] >= 0) {
+    close(m_pipefds[0]);
+  }
+  if (m_pipefds[1] >= 1) {
+    close(m_pipefds[1]);
+  }
+}
+
+void SignalHandler::pipeReadReady() {
+  int signal;
+  if (read(m_pipefds[0], &signal, sizeof(signal)) == sizeof(signal)) {
+    logger.debug() << "Signal" << signal;
+    emit quitRequested();
+  }
+}
+
+void SignalHandler::saHandler(int signal) {
+  if (s_signalpipe >= 0) {
+    if (write(s_signalpipe, &signal, sizeof(signal)) != sizeof(signal)) {
+      logger.warning() << "Unable to write in the pipe";
+    }
+  }
+}