124 lines
4.5 KiB
HTML
124 lines
4.5 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width">
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<title>GoSmartKeyboard</title>
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<link rel="stylesheet" href="google-code-prettify/prettify.css">
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<link rel="stylesheet" href="styles/prettify-theme.css">
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<script defer src="google-code-prettify/prettify.js"></script>
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<script defer src="google-code-prettify/run_prettify.js"></script>
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<link rel="stylesheet" href="styles/main.css">
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</head>
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<!-- Generated by srcweave https://github.com/justinmeiners/srcweave -->
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<h1>Streaming keyboard input<a id="c16"></a></h1>
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<p>We use the Gorilla websocket library to handle the websocket connection.</p>
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<p>Most of the time, we can use the keylogger library (which uses uinput) to effeciently press keys. However, if we need to send a character that keylogger doesn’t know about, we can use the xdotool command. xdotool is also useful if one does not want to use root.</p>
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<p>xdotool spawns a new process for each keypress, so it’s not as effecient as keylogger.</p>
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<p>To specify xdotool usage, the client should send a message with the format <code>{kb_cmd:xdotool}:message</code> where message is a utf-8 string.</p>
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<div class="code-block">
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<span class="block-header">
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<strong class="block-title"><em><a id="streaming-keyboard-input-block-56" href="#streaming-keyboard-input-block-56">streaming keyboard input</a></em></strong></span>
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<pre class="prettyprint"><code class="">func clientConnected(w http.ResponseWriter, r *http.Request) {
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// regex if string has characters we need to convert to key presses
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characterRegex, _ := regexp.Compile(`[^\x08]\x08|\t|\n`)
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// find keyboard device, does not require a root permission
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keyboard := keylogger.FindKeyboardDevice()
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// check if we found a path to keyboard
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if len(keyboard) <= 0 {
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return
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}
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k, err := keylogger.New(keyboard)
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if err != nil {
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return
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}
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defer k.Close()
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<em class="block-link nocode" title="EnvironmentVariables.html"><a href="EnvironmentVariables.html#always-use-xdotool-environment-variable-block-14">@{always use xdotool environment variable}</a></em>
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if err != nil {
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panic(err)
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}
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c, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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log.Print("upgrade:", err)
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return
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}
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defer c.Close()
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// get auth token
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_, message, err := c.ReadMessage()
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if err != nil {
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log.Println("read:", err)
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return
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}
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if auth.CheckAuthToken(string(message)) != nil {
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log.Println("invalid token")
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c.WriteMessage(websocket.TextMessage, []byte("invalid token"))
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return
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}
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c.WriteMessage(websocket.TextMessage, []byte("authenticated"))
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for {
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time.Sleep(25 * time.Millisecond)
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_, message, err := c.ReadMessage()
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if err != nil {
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log.Println("read:", err)
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break
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}
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log.Printf("recv: %s", message)
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message_string := string(message)
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if message_string == "" {
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message_string = "\n"
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}
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<em class="block-link nocode"><a href="#send-keys-to-system-block-58">@{send keys to system}</a></em>
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}
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}
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</code></pre>
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<p class="block-usages"><small>Used by <a href="Server.html#-server-server-server.go-block-53" title="/server/server/server.go. Server.html">1</a> </small></p></div>
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<h1>Sending the keys<a id="c17"></a></h1>
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<p>Sending the keys is a bit tricky as we need to manually convert backspace, tab, enter and modifier keys.</p>
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<div class="code-block">
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<span class="block-header">
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<strong class="block-title"><em><a id="send-keys-to-system-block-58" href="#send-keys-to-system-block-58">send keys to system</a></em></strong></span>
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<pre class="prettyprint"><code class="">doXDoTool := func(command string, keys string)(err error) {
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var cmd *exec.Cmd
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if command == "type" {
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cmd = exec.Command("xdotool", command, "--delay", "25", keys)
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} else {
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cmd = exec.Command("xdotool", command, keys)
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}
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return cmd.Run()
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}
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<em class="block-link nocode" title="XdotoolCommands.html"><a href="XdotoolCommands.html#handle-xdotoool-commands-block-64">@{handle xdotoool commands}</a></em>
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<em class="block-link nocode" title="Sendkeys.html"><a href="Sendkeys.html#do-streaming-keylogger-approach-block-61">@{do streaming keylogger approach}</a></em>
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</code></pre>
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<p class="block-usages"><small>Used by <a href="#streaming-keyboard-input-block-56" title="streaming keyboard input">1</a> </small></p></div>
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</body>
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</html>
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