12 files changed, 639 insertions, 215 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5f2faeb
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+*.swp
+*~
+build/
+
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..7530b78
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,138 @@
+################################################################################
+# General
+################################################################################
+
+PROJECT(printergui)
+CMAKE_MINIMUM_REQUIRED(VERSION 2.8.0)
+
+# set compiler optimizations for debug and release
+IF (CMAKE_BUILD_TYPE STREQUAL "")
+	SET(CMAKE_BUILD_TYPE Debug)
+ENDIF()
+SET(CMAKE_C_FLAGS_DEBUG "-O0 -g -Wall -Wunused -Wunreachable-code -pedantic")
+SET(CMAKE_C_FLAGS_RELEASE "-O2")
+SET(CMAKE_CXX_FLAGS_DEBUG "-O0 -g -Wall")
+SET(CMAKE_CXX_FLAGS_RELEASE "-O2" )
+
+# local cmake modules
+SET(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake)
+
+# this command finds libraries and sets all required variables
+FIND_PACKAGE(Qt4 REQUIRED)
+FIND_PACKAGE(Cups REQUIRED)
+
+# some includes
+INCLUDE_DIRECTORIES(
+	${CMAKE_SOURCE_DIR}
+	${CMAKE_BINARY_DIR}
+)
+
+################################################################################
+# Variables
+################################################################################
+
+# printergui (maingui)
+FILE(GLOB MAINGUI_SRCS
+	src/maingui/*.cpp
+)
+
+# password gui (printpwgui
+FILE(GLOB PWGUI_SRCS
+	src/pwgui/*.cpp
+)
+
+################################################################################
+# Qt
+################################################################################
+
+# .ui files
+FILE(GLOB MAINGUI_UIS
+	src/maingui/*.ui
+)
+
+FILE(GLOB PWGUI_UIS
+	src/pwgui/*.ui
+)
+
+# .qrc files
+#SET(MAINGUI_RCS pvsmgr.qrc)
+#SET(PWGUI_RCS pvsclient.qrc)
+
+# includes all header files that should be treated with moc
+SET(MAINGUI_MOC_HDRS
+	src/maingui/printergui.h
+)
+
+SET(PWGUI_MOC_HDRS
+	src/pwgui/pwgui.h
+)
+
+# i18n
+#FILE(GLOB MAINGUI_TSS
+#	i18n/server/*.ts
+#)
+
+#FILE(GLOB PWGUI_TSS
+#	i18n/client/*.ts
+#)
+
+
+# include Qt modules
+#SET(QT_USE_QTDBUS TRUE)
+#SET(QT_USE_QTNETWORK TRUE)
+#SET(QT_USE_QTWEBKIT TRUE)
+
+# add some useful macros and variables
+# (QT_USE_FILE is a variable defined by FIND_PACKAGE( Qt4 ) that contains
+# a path to CMake script)
+INCLUDE(${QT_USE_FILE})
+
+# this will run rcc on .qrc files
+#QT4_ADD_RESOURCES(MAINGUI_RC_SRCS ${MAINGUI_RCS})
+#QT4_ADD_RESOURCES(PWGUI_RC_SRCS ${PWGUI_RCS})
+
+# this will run uic on .ui files
+QT4_WRAP_UI(MAINGUI_UI_HDRS ${MAINGUI_UIS})
+QT4_WRAP_UI(PWGUI_UI_HDRS ${PWGUI_UIS})
+
+# this will run moc
+QT4_WRAP_CPP(MAINGUI_MOC_SRCS ${MAINGUI_MOC_HDRS})
+QT4_WRAP_CPP(PWGUI_MOC_SRCS ${PWGUI_MOC_HDRS})
+
+# i18n, run lupdate and lrelease)
+#QT4_CREATE_TRANSLATION(MAINGUI_QMS ${MAINGUI_SRCS} ${MAINGUI_UI_HDRS} ${MAINGUI_TSS})
+#QT4_CREATE_TRANSLATION(PWGUI_QMS ${PWGUI_SRCS} ${PWGUI_UI_HDRS} ${PWGUI_TSS})
+
+################################################################################
+# Build
+################################################################################
+
+ADD_EXECUTABLE(printergui
+    ${MAINGUI_SRCS}
+    ${MAINGUI_MOC_SRCS}
+    ${MAINGUI_UI_HDRS}
+    ${MAINGUI_RC_SRCS}
+    ${MAINGUI_QMS}
+)
+
+ADD_EXECUTABLE(printpwgui
+    ${PWGUI_SRCS}
+    ${PWGUI_MOC_SRCS}
+    ${PWGUI_UI_HDRS}
+    ${PWGUI_RC_SRCS}
+    ${PWGUI_QMS}
+)
+
+# link
+TARGET_LINK_LIBRARIES(printergui
+    ${QT_LIBRARIES}
+    ${CUPS_LIBRARIES}
+)
+
+TARGET_LINK_LIBRARIES(printpwgui
+    ${QT_LIBRARIES}
+)
+
+# install
+INSTALL(TARGETS printergui printpwgui RUNTIME DESTINATION bin)
+
diff --git a/src/main.cpp b/src/maingui/main.cpp
index a5582d4..f9b8bb2 100644
--- a/src/main.cpp
+++ b/src/maingui/main.cpp
@@ -1,7 +1,8 @@
 #include <QApplication>
 #include <fstream>
-#include "mainwindow.h"
-
+#include "printergui.h"
+#include <fcntl.h>
+#include <sys/stat.h>
 
 int main(int argc, char *argv[])
 {
@@ -10,16 +11,15 @@ int main(int argc, char *argv[])
       return 2;
 
   // Check if file exists
-  std::fstream f;
-  try {
-    f.open(argv[2], std::ios::in);
-  } catch (std::fstream::failure e) {
-    return 3;
+  int fh = open(argv[2], O_RDONLY);
+  if (fh < 0) {
+    fprintf(stderr, "ERROR: Could not open %s for reading..\n", argv[2]);
+	 return 2;
   }
-  f.close();
+  close(fh);
 
   QApplication a(argc, argv);
-  MainWindow w(argv);
+  PrinterGui w(argv);
   w.show();
   return a.exec();
 }
diff --git a/src/mainwindow.cpp b/src/maingui/printergui.cpp
index 4b046d0..3744ffc 100644
--- a/src/mainwindow.cpp
+++ b/src/maingui/printergui.cpp
@@ -1,48 +1,55 @@
-#include "mainwindow.h"
-#include "ui_mainwindow.h"
+#include "printergui.h"
+#include "ui_printergui.h"
 #include <QMessageBox>
-#include <time.h>
+#include <unistd.h>
+#include <QTimer>
 
-#define FIELDLEN 200
-static char _username[FIELDLEN];
-static char _password[FIELDLEN];
-
-static const char * cups_password_cb(const char *prompt)
+// ____________________________________________________________________________
+PrinterGui::PrinterGui(char *argv[], QWidget *parent) :
+    QMainWindow(parent),
+    ui(new Ui::PrinterGui),
+    bgTimeout(-1)
 {
-  char bla[200];
-  snprintf(bla, 200, "/tmp/druckertest-%s-%d", _username, (int)time(NULL));
-  FILE *fh = fopen(bla, "a");
-  if (fh != NULL) {
-    const int passlen = strlen(_password);
-    fprintf(fh, "Drucke mit Authentifizierung als '%s', Passwort mit Länge '%d'\n", _username, passlen);
-    fclose(fh);
+  // When called it is guaranteed that argv has (at least) 3 elements
+
+  // Set username
+  char buf[200];
+  if (getlogin_r(buf, 200) == 0) {
+    // Detect real name
+    this->user = strdup(buf);
+  } else {
+    // Fallback to what command line says
+    this->user = strdup(argv[1]);
   }
-  cupsSetUser(_username);
-  return _password;
-}
 
-// ____________________________________________________________________________
-MainWindow::MainWindow(char *argv[], QWidget *parent) :
-    QMainWindow(parent),
-    ui(new Ui::MainWindow),
-    user(argv[1]),
-    file(argv[2]),
-    authRequired(false) {
+  // Filename
+  this->file = new char[strlen(argv[2]) + 10]; // + 10 in case we rename (ghostscript)
+  strcpy(this->file, argv[2]);
+
   // Initialize cups
   num_dests = cupsGetDests(&dests);
 
   // Initialize UI
   initializeUI();
+
+  // Timer
+  this->bgTimer = new QTimer(this);
+  this->bgTimer->setInterval(1000);
+  connect(bgTimer, SIGNAL(timeout()), this, SLOT(on_bgTimer_timeout()));
 }
 
 // ____________________________________________________________________________
-MainWindow::~MainWindow() {
+PrinterGui::~PrinterGui()
+{
   cupsFreeDests(num_dests, dests);
-  delete ui;
+  free(this->user);
+  delete[] this->file;
+  delete this->ui;
 }
 
 // ____________________________________________________________________________
-void MainWindow::initializeUI() {
+void PrinterGui::initializeUI()
+{
   ui->setupUi(this);
   ui->horizontalLayoutButtons->setAlignment(Qt::AlignRight);
 
@@ -75,15 +82,6 @@ void MainWindow::initializeUI() {
   for (int i = 0; i < 3; ++i)
     ui->printerList->resizeColumnToContents(i);
 
-  // Prefill username
-  if (this->user != NULL) {
-    ui->lineEditUser->setText(QString::fromUtf8(user));
-  }
-
-  // Protect password from being seen
-  ui->lineEditPass->setEchoMode(QLineEdit::Password);
-  ui->lineEditPass->setInputMethodHints(ui->lineEditPass->inputMethodHints() | Qt::ImhNoAutoUppercase);
-
   /*  Main Window properties  */
 
   // Disable close button
@@ -95,7 +93,8 @@ void MainWindow::initializeUI() {
 }
 
 // ____________________________________________________________________________
-void MainWindow::on_printerList_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous) {
+void PrinterGui::on_printerList_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous)
+{
   ui->printerList->setFocus();
 
   cups_dest_t *dest =cupsGetNamedDest(CUPS_HTTP_DEFAULT, current->text(0).toUtf8().constData(), NULL);
@@ -111,26 +110,6 @@ void MainWindow::on_printerList_currentItemChanged(QTreeWidgetItem *current, QTr
     res = ::atoi(type);
   }
 
-  const char *auth = cupsGetOption("auth-info-required", dest->num_options, dest->options);
-  if (auth != NULL && (strstr(auth, "username") != NULL || strstr(auth, "password") != NULL)) {
-    res |= CUPS_PRINTER_AUTHENTICATED;
-  }
-
-  // Check authentication
-  if (res & CUPS_PRINTER_AUTHENTICATED) {
-    ui->labelUser->setEnabled(true);
-    ui->labelPass->setEnabled(true);
-    ui->lineEditUser->setEnabled(true);
-    ui->lineEditPass->setEnabled(true);
-    this->authRequired = true;
-  } else {
-    ui->labelUser->setEnabled(false);
-    ui->labelPass->setEnabled(false);
-    ui->lineEditUser->setEnabled(false);
-    ui->lineEditPass->setEnabled(false);
-    this->authRequired = false;
-  }
-
   // Check color capabilities
   if (res & CUPS_PRINTER_COLOR) {
     ui->comboBoxColor->setEnabled(true);
@@ -167,24 +146,29 @@ void MainWindow::on_printerList_currentItemChanged(QTreeWidgetItem *current, QTr
 }
 
 // ____________________________________________________________________________
-void MainWindow::on_buttonCancel_clicked() {
+void PrinterGui::on_buttonCancel_clicked()
+{
   // Quit with code 1
   QCoreApplication::instance()->exit(1);
 }
 
 // ____________________________________________________________________________
-void MainWindow::on_buttonPrint_clicked() {
+void PrinterGui::on_buttonPrint_clicked()
+{
   QString cmd;
 
   // Wenn Farbe möglich ist. Aber trotzdem Graustufen gewählt
   // Schieb file durch ghostscript
   if (ui->comboBoxColor->isEnabled() && ui->comboBoxColor->currentIndex() == 0) {
     // Run ghostscript to make file grayscale
-    cmd = QString("gs -sDEVICE=psgray -dNOPAUSE -dBATCH -dQUIET -dSAFER  -sOutputFile=\"%22\" \"%1\"").arg(
-                file,
-                file);
-    if (system(cmd.toUtf8().constData()))
-      return; // TODO WARN ABOUT MISSED GS JOB
+    cmd = QString::fromUtf8("gs -sDEVICE=psgray -dNOPAUSE -dBATCH -dQUIET -dSAFER  -sOutputFile=\"%1.conv\" \"%1\"")
+        .arg(QString::fromUtf8(this->file));
+    if (system(cmd.toUtf8().constData())) {
+      QMessageBox::critical(this, "PrinterGUI", "Kann Druckauftrag nicht in Graustufen konvertieren.");
+      return;
+    } else {
+      strcat(this->file, ".conv");
+    }
 
   }
 
@@ -229,15 +213,7 @@ void MainWindow::on_buttonPrint_clicked() {
                                        &(dest->options));
   }
 
-  if (!this->authRequired) {
-    // Only Username
-    cupsSetUser(this->user);
-  } else {
-    // Username + Password
-    snprintf(_username, FIELDLEN, "%s", ui->lineEditUser->text().toUtf8().constData());
-    snprintf(_password, FIELDLEN, "%s", ui->lineEditPass->text().toUtf8().constData());
-    cupsSetPasswordCB(&cups_password_cb);
-  }
+  cupsSetUser(this->user);
 
   // Drucken
   if( 0 == cupsPrintFile(dest->name,
@@ -245,46 +221,23 @@ void MainWindow::on_buttonPrint_clicked() {
                          NULL,
                          dest->num_options,
                          dest->options)) {
-    QMessageBox msgBox;
-    msgBox.setText(cupsLastErrorString());
-    msgBox.exec();
-  } else { // Quit with code 0
-    QCoreApplication::instance()->quit();
+    QMessageBox::critical(this, "CUPS Fehler", cupsLastErrorString());
+  } else {
+    this->bgTimeout = 0;
+    this->hide();
   }
 
 }
 
+void PrinterGui::on_bgTimer_timeout()
+{
+  if (this->bgTimeout == -1) {
+    // Could do something here every second....
+    return;
+  }
+  if (++this->bgTimeout > 4) {
+    // Job was sent, GUI is invisible, quit after a few seconds
+    QCoreApplication::instance()->quit();
+  }
+}
 
-///////////////////////////////  CODE PAPIERKORB  /////////////////////////////
-
-/* * Print via sysctem command * */
-//    // Username, part of whoami source
-//    register uid_t uid = geteuid();
-//    const char *username = getpwuid(uid)->pw_name;
-//    cmd = QString("lp -U %1").arg(username);
-//    // Duplex
-//    if (ui->comboBoxSides->isEnabled())
-//    {
-//        switch (ui->comboBoxSides->currentIndex()){
-//        case 0:
-//            cmd.append(" -o sides=one-sided");
-//            break;
-//        case 1:
-//            cmd.append(" -o sides=two-sided-long-edge");
-//            break;
-//        case 2:
-//            cmd.append(" -o sides=two-sided-long-edge");
-//            break;
-//        }
-//    }
-//    // Kopien
-//    if (ui->lineEditCopies->isEnabled())
-//        cmd.append(QString(" -n %1").arg(ui->lineEditCopies->text()));
-//    // Queue
-//    cmd.append(QString(" -d %1").arg(ui->printerList->currentItem()->text(0)));
-//    // File
-//    cmd.append(QString(" -- \"%1\"").arg(file));
-//    // Print results to stdout
-//    QTextStream (stdout, QIODevice::WriteOnly) << cmd;
-//    // Execute the command
-//    system(cmd.toUtf8().constData());
diff --git a/src/mainwindow.h b/src/maingui/printergui.h
index ec0e4a8..223d787 100644
--- a/src/mainwindow.h
+++ b/src/maingui/printergui.h
@@ -8,30 +8,34 @@
 #include "cups/cups.h"
 
 namespace Ui {
-class MainWindow;
+class PrinterGui;
 }
 
-class MainWindow : public QMainWindow
+class QTimer;
+
+class PrinterGui : public QMainWindow
 {
     Q_OBJECT
 
 public:
-    explicit MainWindow(char *argv[], QWidget *parent = 0);
-    ~MainWindow();
+    explicit PrinterGui(char *argv[], QWidget *parent = 0);
+    ~PrinterGui();
 
 private slots:
     void on_printerList_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous);
     void on_buttonCancel_clicked();
     void on_buttonPrint_clicked();
+    void on_bgTimer_timeout();
 
 private:
-    Ui::MainWindow *ui;
+    Ui::PrinterGui *ui;
     void initializeUI();
     cups_dest_t *dests;
     int num_dests;
-    const char * const user;
-    const char * const file;
-    bool authRequired;
+    char * user;
+    char * file;
+    QTimer * bgTimer;
+    int bgTimeout;
 };
 
 #endif // MAINWINDOW_H
diff --git a/src/mainwindow.ui b/src/maingui/printergui.ui
index 9533e94..8fafd23 100644
--- a/src/mainwindow.ui
+++ b/src/maingui/printergui.ui
@@ -1,17 +1,23 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
- <class>MainWindow</class>
- <widget class="QMainWindow" name="MainWindow">
+ <class>PrinterGui</class>
+ <widget class="QMainWindow" name="PrinterGui">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>574</width>
+    <width>590</width>
     <height>286</height>
    </rect>
   </property>
+  <property name="minimumSize">
+   <size>
+    <width>590</width>
+    <height>286</height>
+   </size>
+  </property>
   <property name="windowTitle">
-   <string>Printjob</string>
+   <string>Druckauftrag</string>
   </property>
   <widget class="QWidget" name="centralWidget">
    <layout class="QGridLayout" name="gridLayout">
@@ -34,36 +40,6 @@
       </item>
       <item>
        <layout class="QGridLayout" name="gridLayout_2">
-        <item row="2" column="1">
-         <layout class="QHBoxLayout" name="horizontalLayoutUser">
-          <item>
-           <widget class="QLabel" name="labelUser">
-            <property name="enabled">
-             <bool>false</bool>
-            </property>
-            <property name="text">
-             <string>User:</string>
-            </property>
-            <property name="alignment">
-             <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
-            </property>
-           </widget>
-          </item>
-          <item>
-           <widget class="QLineEdit" name="lineEditUser">
-            <property name="enabled">
-             <bool>false</bool>
-            </property>
-            <property name="sizePolicy">
-             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
-              <horstretch>0</horstretch>
-              <verstretch>0</verstretch>
-             </sizepolicy>
-            </property>
-           </widget>
-          </item>
-         </layout>
-        </item>
         <item row="2" column="0">
          <widget class="QComboBox" name="comboBoxColor">
           <property name="enabled">
@@ -103,36 +79,6 @@
           </item>
          </widget>
         </item>
-        <item row="3" column="1">
-         <layout class="QHBoxLayout" name="horizontalLayoutPass">
-          <item>
-           <widget class="QLabel" name="labelPass">
-            <property name="enabled">
-             <bool>false</bool>
-            </property>
-            <property name="text">
-             <string>Password:</string>
-            </property>
-            <property name="alignment">
-             <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
-            </property>
-           </widget>
-          </item>
-          <item>
-           <widget class="QLineEdit" name="lineEditPass">
-            <property name="enabled">
-             <bool>false</bool>
-            </property>
-            <property name="sizePolicy">
-             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
-              <horstretch>0</horstretch>
-              <verstretch>0</verstretch>
-             </sizepolicy>
-            </property>
-           </widget>
-          </item>
-         </layout>
-        </item>
         <item row="3" column="2">
          <layout class="QHBoxLayout" name="horizontalLayoutButtons">
           <item>
@@ -217,6 +163,32 @@
           </item>
          </layout>
         </item>
+        <item row="2" column="1">
+         <spacer name="horizontalSpacer">
+          <property name="orientation">
+           <enum>Qt::Horizontal</enum>
+          </property>
+          <property name="sizeHint" stdset="0">
+           <size>
+            <width>40</width>
+            <height>20</height>
+           </size>
+          </property>
+         </spacer>
+        </item>
+        <item row="3" column="1">
+         <spacer name="horizontalSpacer_2">
+          <property name="orientation">
+           <enum>Qt::Horizontal</enum>
+          </property>
+          <property name="sizeHint" stdset="0">
+           <size>
+            <width>40</width>
+            <height>20</height>
+           </size>
+          </property>
+         </spacer>
+        </item>
        </layout>
       </item>
      </layout>
diff --git a/src/printergui.pro b/src/printergui.pro
deleted file mode 100644
index 5b6da93..0000000
--- a/src/printergui.pro
+++ /dev/null
@@ -1,22 +0,0 @@
-#-------------------------------------------------
-#
-# Project created by QtCreator 2013-09-26T00:51:08
-#
-#-------------------------------------------------
-
-QT       += core gui
-
-greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
-
-TARGET = printergui
-TEMPLATE = app
-
-
-SOURCES += main.cpp\
-        mainwindow.cpp
-
-HEADERS  += mainwindow.h
-
-FORMS    += mainwindow.ui
-
-LIBS += -L/usr/lib/x86_64-linux-gnu -lcups
diff --git a/src/pwgui/config.h b/src/pwgui/config.h
new file mode 100644
index 0000000..a06d9db
--- /dev/null
+++ b/src/pwgui/config.h
@@ -0,0 +1,5 @@
+// This is where pwgui will look for backends.
+// Works exactly like /usr/lib/cups/backend, but don't
+// use that as it would cause pwgui invoking itself again...
+#define BACKEND_PATH "/opt/openslx/cups/backend"
+
diff --git a/src/pwgui/main.cpp b/src/pwgui/main.cpp
new file mode 100644
index 0000000..d75f280
--- /dev/null
+++ b/src/pwgui/main.cpp
@@ -0,0 +1,135 @@
+#include "pwgui.h"
+#include "config.h"
+#include <QApplication>
+#include <cups/backend.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#define NAMELEN 400
+#define BUFLEN 1000
+
+static int run_backend(char *backend, char *uri, char *jobid, char *user, char *title, char *copies, char *options, char *file, char *password);
+
+int main(int argc, char *argv[])
+{
+  char tmpfile[NAMELEN];
+  char device[NAMELEN];
+  char backend[NAMELEN];
+  int spoolres;
+
+  // Pretty much what smbspool does, but in a generalized way
+  if (argc > 2 && strstr(argv[0], ":/") == NULL && strstr(argv[1], ":/") != NULL) {
+    argv++;
+    argc--;
+   }
+
+  // First check parameter count
+  if (argc != 6 && argc != 7) {
+    fputs("ERROR: Invalid number of arguments passed.\n", stderr);
+    return CUPS_BACKEND_FAILED;
+  }
+
+  if (argc == 6) {
+    // Data comes from stdin, save...
+    snprintf(tmpfile, NAMELEN, "/tmp/print-%s-%d-%s-%d", argv[1], (int)time(NULL), argv[2], (int)getpid());
+    int fh = open(tmpfile, O_CREAT | O_WRONLY | O_TRUNC, 0600);
+    if (fh < 0) {
+      fprintf(stderr, "ERROR: Could not open %s for writing..\n", tmpfile);
+      return CUPS_BACKEND_FAILED;
+    }
+    char buffer[BUFLEN];
+    size_t bytes, ret;
+    while (!feof(stdin)) {
+      bytes = fread(buffer, BUFLEN, 1, stdin);
+      if (bytes == 0) break;
+      if ((ret = write(fh, buffer, bytes)) != bytes) {
+        fprintf(stderr, "ERROR: Could not write %d bytes to %s (wrote %d)\n", (int)bytes, tmpfile, (int)ret);
+        remove(tmpfile);
+        return CUPS_BACKEND_FAILED;
+      }
+    }
+    close(fh);
+    //
+  } else {
+    // File given, check if file exists
+    snprintf(tmpfile, NAMELEN, "%s", argv[6]);
+    int fh = open(tmpfile, O_RDONLY);
+    if (fh < 0) {
+      fprintf(stderr, "ERROR: Could not open %s for reading..\n", tmpfile);
+      return CUPS_BACKEND_FAILED;
+    }
+    close(fh);
+    //
+  }
+
+  // Determine device uri
+  char *env = getenv("DEVICE_URI");
+  if (env != NULL && strchr(env, ':') != NULL) {
+    snprintf(device, NAMELEN, "%s", env);
+  } else if (strstr(argv[0], ":/") != NULL)  {
+    snprintf(device, NAMELEN, "%s", argv[0]);
+  } else {
+    fputs("ERROR: No device URI given.\n", stderr);
+    return CUPS_BACKEND_FAILED;
+  }
+
+  // Get backend from uri
+  char *colon = strchr(device, ':');
+  *colon = '\0';
+  snprintf(backend, NAMELEN, "%s/%s", BACKEND_PATH, device);
+  *colon = ':';
+  // Is valid?
+  if (access(backend, X_OK | R_OK) != 0) {
+    fprintf(stderr, "ERROR: Backend %s is not executable.\n", backend);
+    return CUPS_BACKEND_FAILED;
+  }
+
+  // Try right away with what we got
+  spoolres = run_backend(backend, device, argv[1], argv[2], argv[3], argv[4], argv[5], tmpfile, NULL);
+  if (spoolres == CUPS_BACKEND_OK) return spoolres; // Yay
+
+  // Dialog - TODO: Drop privileges here!
+  QApplication a(argc, argv);
+  PwGui w(NULL);
+  w.show();
+  return a.exec();
+  // TODO .....
+}
+
+static int run_backend(char *backend, char *uri, char *jobid, char *user, char *title, char *copies, char *options, char *file, char *password)
+{
+  pid_t pid = fork();
+  if (pid == 0) {
+    // Child
+    if (user != NULL) setenv("AUTH_USERNAME", user, 1);
+    if (password != NULL) setenv("AUTH_PASSWORD", password, 1);
+    char *args[8];
+    args[0] = uri;
+    args[1] = jobid;
+    args[2] = user;
+    args[3] = title;
+    args[4] = copies;
+    args[5] = options;
+    args[6] = file;
+    args[7] = NULL;
+    execv(backend, args);
+    exit(127);
+    return 127;
+  }
+
+  // Main - wait for it...
+  int status;
+  waitpid(pid, &status, 0);
+  if (!WIFEXITED(status)) {
+    fprintf(stderr, "ERROR: Running backend %s failed!\n", backend);
+    return CUPS_BACKEND_FAILED;
+  }
+  return WEXITSTATUS(status);
+}
+
diff --git a/src/pwgui/pwgui.cpp b/src/pwgui/pwgui.cpp
new file mode 100644
index 0000000..31dd822
--- /dev/null
+++ b/src/pwgui/pwgui.cpp
@@ -0,0 +1,59 @@
+#include "pwgui.h"
+#include "ui_pwgui.h"
+#include <QMessageBox>
+#include <QTimer>
+#include <QDesktopWidget>
+
+// ____________________________________________________________________________
+PwGui::PwGui(QWidget *parent) :
+    QMainWindow(parent),
+    ui(new Ui::PwGui) {
+  // Initialize UI
+  initializeUI();
+}
+
+// ____________________________________________________________________________
+PwGui::~PwGui() {
+  delete ui;
+}
+
+// ____________________________________________________________________________
+void PwGui::initializeUI() {
+  ui->setupUi(this);
+
+  /*
+  // Prefill username
+  if (this->user != NULL) {
+    ui->lineEditUser->setText(QString::fromUtf8(user));
+  }
+  */
+
+  // Protect password from being seen
+  ui->lineEditPass->setEchoMode(QLineEdit::Password);
+  ui->lineEditPass->setInputMethodHints(ui->lineEditPass->inputMethodHints() | Qt::ImhNoAutoUppercase);
+
+  /*  Main Window properties  */
+
+  // Disable close button
+  this->setWindowFlags((this->windowFlags() & ~Qt::WindowCloseButtonHint) | Qt::WindowStaysOnTopHint);
+  // center dialog on screen center
+  QRect desktopRect = QApplication::desktop()->screenGeometry(this);
+  this->move( desktopRect.width()/2-this->width()/2,
+              desktopRect.height()/2-this->height()/2);
+}
+
+/*
+void PwGui::on_buttonCancel_clicked() {
+  // Quit with code 1
+  QCoreApplication::instance()->exit(1);
+}
+*/
+
+// ____________________________________________________________________________
+void PwGui::on_checkStatusTimer() {
+  static int retries = 0;
+  if (++retries > 20) {
+    QCoreApplication::instance()->quit();
+  }
+}
+
diff --git a/src/pwgui/pwgui.h b/src/pwgui/pwgui.h
new file mode 100644
index 0000000..3e56ec8
--- /dev/null
+++ b/src/pwgui/pwgui.h
@@ -0,0 +1,31 @@
+#ifndef AUTHENTICATION_H
+#define AUTHENTICATION_H
+
+#include <QMainWindow>
+#include <QDebug>
+#include <QTimer>
+
+namespace Ui {
+class PwGui;
+}
+
+class QTimer;
+
+class PwGui : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    explicit PwGui(QWidget *parent = 0);
+    ~PwGui();
+
+private slots:
+    void on_checkStatusTimer();
+
+private:
+    Ui::PwGui *ui;
+    void initializeUI();
+    QTimer* checkStatusTimer;
+};
+
+#endif // AUTHENTICATION_H
diff --git a/src/pwgui/pwgui.ui b/src/pwgui/pwgui.ui
new file mode 100644
index 0000000..236df30
--- /dev/null
+++ b/src/pwgui/pwgui.ui
@@ -0,0 +1,145 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>PwGui</class>
+ <widget class="QMainWindow" name="PwGui">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>310</width>
+    <height>160</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <property name="windowTitle">
+   <string>Drucken - Authentifizierung</string>
+  </property>
+  <widget class="QWidget" name="verticalLayoutWidget">
+   <property name="geometry">
+    <rect>
+     <x>9</x>
+     <y>9</y>
+     <width>291</width>
+     <height>141</height>
+    </rect>
+   </property>
+   <layout class="QVBoxLayout" name="verticalLayout">
+    <item>
+     <layout class="QHBoxLayout" name="horizontalLayout">
+      <item>
+       <widget class="QLabel" name="label">
+        <property name="text">
+         <string>Benutzername</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <spacer name="horizontalSpacer">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item>
+       <widget class="QLineEdit" name="lineEditUser">
+        <property name="sizePolicy">
+         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+          <horstretch>0</horstretch>
+          <verstretch>0</verstretch>
+         </sizepolicy>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </item>
+    <item>
+     <layout class="QHBoxLayout" name="horizontalLayout_3">
+      <item>
+       <widget class="QLabel" name="label_2">
+        <property name="text">
+         <string>Passwort</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <spacer name="horizontalSpacer_2">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item>
+       <widget class="QLineEdit" name="lineEditPass">
+        <property name="sizePolicy">
+         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+          <horstretch>0</horstretch>
+          <verstretch>0</verstretch>
+         </sizepolicy>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </item>
+    <item>
+     <widget class="QLabel" name="labelStatus">
+      <property name="layoutDirection">
+       <enum>Qt::LeftToRight</enum>
+      </property>
+      <property name="frameShape">
+       <enum>QFrame::Panel</enum>
+      </property>
+      <property name="frameShadow">
+       <enum>QFrame::Sunken</enum>
+      </property>
+      <property name="text">
+       <string>Bitte Anmelden</string>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <spacer name="verticalSpacer">
+      <property name="orientation">
+       <enum>Qt::Vertical</enum>
+      </property>
+      <property name="sizeHint" stdset="0">
+       <size>
+        <width>20</width>
+        <height>40</height>
+       </size>
+      </property>
+     </spacer>
+    </item>
+    <item>
+     <layout class="QHBoxLayout" name="horizontalLayout_2">
+      <item>
+       <widget class="QDialogButtonBox" name="buttonBox">
+        <property name="standardButtons">
+         <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </item>
+   </layout>
+  </widget>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>