MenuApplets: Add Network menu applet

Author: https://github.com/bcoles
Commit: https://github.com/SerenityOS/serenity/commit/4d89c1885df
Pull-request: https://github.com/SerenityOS/serenity/pull/4461

Base/etc/SystemServer.ini

@@ -102,6 +102,13 @@ Priority=low
 KeepAlive=1
 User=anon
 
+[Network.MenuApplet]
+Executable=/bin/Network.MenuApplet
+Arguments=--name=Network --display-notifications
+Priority=low
+KeepAlive=1
+User=anon
+
 [ClipboardHistory.MenuApplet]
 Priority=low
 KeepAlive=1

Base/etc/WindowServer/WindowServer.ini

@@ -30,4 +30,4 @@ DoubleClickSpeed=250
 Mode=scaled
 
 [Applet]
-Order=Clock,ClipboardHistory,Audio,CPUGraph,MemoryGraph,UserName
+Order=Clock,Network,ClipboardHistory,Audio,CPUGraph,MemoryGraph,UserName

MenuApplets/CMakeLists.txt

@@ -1,5 +1,6 @@
 add_subdirectory(Audio)
 add_subdirectory(ClipboardHistory)
 add_subdirectory(Clock)
+add_subdirectory(Network)
 add_subdirectory(ResourceGraph)
 add_subdirectory(UserName)

MenuApplets/Network/CMakeLists.txt

@@ -0,0 +1,6 @@
+set(SOURCES
+    main.cpp
+)
+
+serenity_bin(Network.MenuApplet)
+target_link_libraries(Network.MenuApplet LibGUI LibCore LibGfx)

MenuApplets/Network/main.cpp

@@ -0,0 +1,230 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <LibCore/ArgsParser.h>
+#include <LibCore/File.h>
+#include <LibGUI/Action.h>
+#include <LibGUI/Application.h>
+#include <LibGUI/ImageWidget.h>
+#include <LibGUI/Menu.h>
+#include <LibGUI/Notification.h>
+#include <LibGUI/Window.h>
+#include <LibGfx/Bitmap.h>
+#include <serenity.h>
+#include <spawn.h>
+#include <stdio.h>
+
+class NetworkWidget final : public GUI::ImageWidget {
+    C_OBJECT(NetworkWidget);
+
+public:
+    NetworkWidget(bool notifications)
+    {
+        m_notifications = notifications;
+        update_widget();
+        start_timer(5000);
+    }
+
+private:
+    virtual void timer_event(Core::TimerEvent&) override
+    {
+        update_widget();
+    }
+
+    virtual void mousedown_event(GUI::MouseEvent& event) override
+    {
+        if (event.button() != GUI::MouseButton::Left)
+            return;
+
+        pid_t child_pid;
+        const char* argv[] = { "SystemMonitor", nullptr };
+
+        if ((errno = posix_spawn(&child_pid, "/bin/SystemMonitor", nullptr, nullptr, const_cast<char**>(argv), environ))) {
+            perror("posix_spawn");
+            return;
+        }
+
+        if (disown(child_pid) < 0)
+            perror("disown");
+    }
+
+    virtual void update_widget()
+    {
+        auto adapter_info = get_adapter_info();
+
+        if (adapter_info == "") {
+            set_connected(false);
+            m_adapter_info = "No network adapters";
+        } else {
+            m_adapter_info = adapter_info;
+        }
+
+        set_tooltip(m_adapter_info);
+
+        if (m_connected)
+            NetworkWidget::set_bitmap(m_connected_icon);
+        else
+            NetworkWidget::set_bitmap(m_disconnected_icon);
+
+        update();
+    }
+
+    virtual void notify_on_connect()
+    {
+        if (!m_notifications)
+            return;
+        auto notification = GUI::Notification::construct();
+        notification->set_title("Network");
+        notification->set_icon(m_connected_icon);
+        notification->set_text("Network connected");
+        notification->show();
+    }
+
+    virtual void notify_on_disconnect()
+    {
+        if (!m_notifications)
+            return;
+        auto notification = GUI::Notification::construct();
+        notification->set_title("Network");
+        notification->set_icon(m_disconnected_icon);
+        notification->set_text("Network disconnected");
+        notification->show();
+    }
+
+    virtual void set_connected(bool connected)
+    {
+        if (m_connected != connected) {
+            connected ? notify_on_connect() : notify_on_disconnect();
+        }
+
+        m_connected = connected;
+    }
+
+    virtual String get_adapter_info(bool include_loopback = false)
+    {
+        StringBuilder adapter_info;
+
+        auto file = Core::File::construct("/proc/net/adapters");
+        if (!file->open(Core::IODevice::ReadOnly)) {
+            fprintf(stderr, "Error: %s\n", file->error_string());
+            return adapter_info.to_string();
+        }
+
+        auto file_contents = file->read_all();
+        auto json = JsonValue::from_string(file_contents);
+
+        if (!json.has_value())
+            return adapter_info.to_string();
+
+        int connected_adapters = 0;
+        json.value().as_array().for_each([&adapter_info, include_loopback, &connected_adapters](auto& value) {
+            auto if_object = value.as_object();
+            auto ip_address = if_object.get("ipv4_address").to_string();
+            auto ifname = if_object.get("name").to_string();
+
+            if (!include_loopback)
+                if (ifname == "loop0")
+                    return;
+            if (ip_address != "null")
+                connected_adapters++;
+
+            adapter_info.appendf("%s: %s\n", ifname.characters(), ip_address.characters());
+        });
+
+        // show connected icon so long as at least one adapter is connected
+        connected_adapters ? set_connected(true) : set_connected(false);
+
+        return adapter_info.to_string();
+    }
+
+    String m_adapter_info;
+    bool m_connected = false;
+    bool m_notifications = true;
+    RefPtr<Gfx::Bitmap> m_connected_icon = Gfx::Bitmap::load_from_file("/res/icons/16x16/network.png");
+    RefPtr<Gfx::Bitmap> m_disconnected_icon = Gfx::Bitmap::load_from_file("/res/icons/16x16/network-disconnected.png");
+};
+
+int main(int argc, char* argv[])
+{
+    if (pledge("stdio shared_buffer accept rpath unix cpath fattr unix proc exec", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
+    auto app = GUI::Application::construct(argc, argv);
+
+    if (pledge("stdio shared_buffer accept rpath unix proc exec", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
+    if (unveil("/res", "r") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    if (unveil("/tmp/portal/notify", "rw") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    if (unveil("/proc/net/adapters", "r") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    if (unveil("/bin/SystemMonitor", "x") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    if (unveil(nullptr, nullptr) < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    bool display_notifications = false;
+    const char* name = nullptr;
+    Core::ArgsParser args_parser;
+    args_parser.add_option(display_notifications, "Display notifications", "display-notifications", 'd');
+    args_parser.add_option(name, "Applet name used by WindowServer.ini to set the applet order", "name", 'n', "name");
+    args_parser.parse(argc, argv);
+
+    if (name == nullptr)
+        name = "Network";
+
+    auto window = GUI::Window::construct();
+    window->set_title(name);
+    window->set_window_type(GUI::WindowType::MenuApplet);
+    window->resize(16, 16);
+    auto& icon = window->set_main_widget<NetworkWidget>(display_notifications);
+    icon.set_fill_with_background_color(true);
+    icon.load_from_file("/res/icons/16x16/network.png");
+    window->resize(16, 16);
+    window->show();
+
+    return app->exec();
+}