X2Go Bug report logs - #74
make nxagent keybindings configurable

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From: Alexander Wuerstlein <arw@arw.name>
To: 74@bugs.x2go.org
Cc: Alexander Wuerstlein <arw@arw.name>
Subject: [PATCH 1/2] nxagent keystroke handling: make keys configurable at runtime
Date: Mon,  3 Dec 2012 15:42:11 +0100
Message-Id: <1354545732-28961-1-git-send-email-arw@arw.name>
X-Mailer: git-send-email 1.7.10.4

Replaces the hardcoded nxagent keybindings by a configurable
table of keybindings. The default configuration is the same as the
original one, to maintain compatibility. A user/administrator can either
specify a command line parameter, environment variable or place a file
in ~/.nx/config/keystroke.cfg or /etc/nx/keystroke.cfg to reconfigure
these keybindings.

The configuration file format is XML, a dependency on libxml2 is added
to allow parsing the configuration.
---
 nx-X11/programs/Xserver/Imakefile              |    9 +-
 nx-X11/programs/Xserver/hw/nxagent/Imakefile   |    9 +-
 nx-X11/programs/Xserver/hw/nxagent/Keystroke.c |  699 ++++++++++++++++--------
 nx-X11/programs/Xserver/hw/nxagent/Keystroke.h |   47 ++
 4 files changed, 527 insertions(+), 237 deletions(-)

diff --git a/nx-X11/programs/Xserver/Imakefile b/nx-X11/programs/Xserver/Imakefile
index 3f53eca..80e3a71 100644
--- a/nx-X11/programs/Xserver/Imakefile
+++ b/nx-X11/programs/Xserver/Imakefile
@@ -1013,15 +1013,18 @@ $(NXAGENTOBJS) $(NXAGENTLIBS) $(NXAGENTSYSLIBS):: $(NXAGENTDIRS)
 #if defined(SunArchitecture)
 NXAGENTNXLIBS = -L ../../../nxcomp -L ../../../nxcompext -L ../../../nxcompshad \
                 -lXcomp -lXcompext -lXcompshad -lrt -L/usr/sfw/lib -lNX_Xrender -lNX_Xfixes \
-                -L../../../nx-X11/exports/lib -lNX_Xtst -lNX_Xdamage -lNX_Xrandr -lNX_Xcomposite -lNX_Xdmcp
+                -L../../../nx-X11/exports/lib -lNX_Xtst -lNX_Xdamage -lNX_Xrandr -lNX_Xcomposite -lNX_Xdmcp \
+		`pkg-config --libs libxml-2.0`
 #elif defined(cygwinArchitecture)
 NXAGENTNXLIBS = -L ../../../nxcomp -L ../../../nxcompext \
                 -lXcomp -lXcompext -lNX_Xrender -lNX_X11 -lNX_Xext -lNX_Xcomposite -lNX_Xfixes \
-                -L ../../../nxcompshad -lXcompshad -L../../../nx-X11/exports/lib -lNX_Xtst -lNX_Xdmcp
+                -L ../../../nxcompshad -lXcompshad -L../../../nx-X11/exports/lib -lNX_Xtst -lNX_Xdmcp \
+		`pkg-config --libs libxml-2.0`
 #else
 NXAGENTNXLIBS = -L ../../../nxcomp -L ../../../nxcompext -L ../../../nxcompshad \
                 -lXcomp -lXcompext -lXcompshad -lNX_Xrender -lNX_X11 -lNX_Xext -lNX_Xfixes \
-                -L../../../nx-X11/exports/lib -lNX_Xtst -lNX_Xdamage -lNX_Xrandr -lNX_Xcomposite -lNX_Xinerama -lNX_Xdmcp
+                -L../../../nx-X11/exports/lib -lNX_Xtst -lNX_Xdamage -lNX_Xrandr -lNX_Xcomposite -lNX_Xinerama -lNX_Xdmcp \
+		`pkg-config --libs libxml-2.0`
 #endif
 
 #endif
diff --git a/nx-X11/programs/Xserver/hw/nxagent/Imakefile b/nx-X11/programs/Xserver/hw/nxagent/Imakefile
index a8e1621..ccd53d1 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Imakefile
+++ b/nx-X11/programs/Xserver/hw/nxagent/Imakefile
@@ -142,7 +142,8 @@ INCLUDES = -I. -I../../../../../nxcomp -I../../../../../nxcompext -I../../../../
            -I../../miext/damage -I../../miext/cw \
 	   -I../../GL/glx -I../../GL/include -I../../../../lib/GL/include -I../../Xext \
            -I$(EXTINCSRC) -I$(XINCLUDESRC) \
-	   $(VFBINCLUDES) $(NXFONTINCLUDES) $(LIBXRANDRINCLUDES)
+	   $(VFBINCLUDES) $(NXFONTINCLUDES) $(LIBXRANDRINCLUDES) \
+	   `pkg-config --cflags-only-I libxml-2.0`
 #ifdef SunArchitecture
 INCLUDES = -I. -I../../../../../nxcomp -I../../../../../nxcompext -I../../../../../nxcompshad \
            -I../../../../extras/Mesa/include \
@@ -152,7 +153,8 @@ INCLUDES = -I. -I../../../../../nxcomp -I../../../../../nxcompext -I../../../../
 	   -I../../GL/glx -I../../GL/include -I../../../../lib/GL/include -I../../Xext \
            -I../../miext/damage -I../../miext/cw \
            -I$(EXTINCSRC) -I$(XINCLUDESRC) \
-	   $(VFBINCLUDES) $(NXFONTINCLUDES) $(LIBXRANDRINCLUDES)
+	   $(VFBINCLUDES) $(NXFONTINCLUDES) $(LIBXRANDRINCLUDES) \
+	   `pkg-config --cflags-only-I libxml-2.0`
 #else
 #ifdef cygwinArchitecture
 INCLUDES = -I. -I$(XBUILDINCDIR) -I$(FONTINCSRC) \
@@ -162,7 +164,8 @@ INCLUDES = -I. -I$(XBUILDINCDIR) -I$(FONTINCSRC) \
            -I../../../../../nxcomp -I../../../../../nxcompext -I../../../../../nxcompshad \
            -I../../../../extras/Mesa/include \
            -I$(EXTINCSRC) -I$(XINCLUDESRC) \
-	   $(VFBINCLUDES) $(NXFONTINCLUDES) $(LIBXRANDRINCLUDES)
+	   $(VFBINCLUDES) $(NXFONTINCLUDES) $(LIBXRANDRINCLUDES) \
+	   `pkg-config --cflags-only-I libxml-2.0`
 #endif
 #endif
 
diff --git a/nx-X11/programs/Xserver/hw/nxagent/Keystroke.c b/nx-X11/programs/Xserver/hw/nxagent/Keystroke.c
index 6c6e477..b5f4acf 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Keystroke.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/Keystroke.c
@@ -28,8 +28,15 @@
 #include "Keystroke.h"
 #include "Drawable.h"
 
+#include <unistd.h>
+
+#include <libxml/parser.h>
+#include <libxml/tree.h>
+
 extern Bool nxagentWMIsRunning;
 extern Bool nxagentIpaq;
+extern char *nxagentKeystrokeFile;
+Bool nxagentKeystrokeFileParsed = False;
 
 #ifdef NX_DEBUG_INPUT
 int nxagentDebugInputDevices = 0;
@@ -47,10 +54,369 @@ extern void nxagentDeactivateInputDevicesGrabs();
 #undef  DEBUG
 #undef  DUMP
 
+
+/* this table is used to parse actions given on the command line or in the
+ * config file, therefore indices have to match the enum in Keystroke.h */
+char * nxagentSpecialKeystrokeNames[] = {
+	"end_marker",
+	"close_session",
+	"switch_all_screens",
+	"minimize",
+	"left",
+	"up",
+	"right",
+	"down",
+	"resize",
+	"defer",
+	"ignore",
+	"force_synchronization",
+
+	"debug_tree",
+	"regions_on_screen",
+	"test_input",
+	"deactivate_input_devices_grab",
+
+	"fullscreen",
+	"viewport_move_left",
+	"viewport_move_up",
+	"viewport_move_right",
+	"viewport_move_down",
+	NULL,
+};
+
+struct nxagentSpecialKeystrokeMap default_map[] = {
+  /* stroke, modifierMask, modifierAltMeta, keysym */
+  {KEYSTROKE_DEBUG_TREE, ControlMask, 1, XK_q},
+  {KEYSTROKE_DEBUG_TREE, ControlMask, 1, XK_Q},
+  {KEYSTROKE_CLOSE_SESSION, ControlMask, 1, XK_t},
+  {KEYSTROKE_CLOSE_SESSION, ControlMask, 1, XK_T},
+  {KEYSTROKE_SWITCH_ALL_SCREENS, ControlMask, 1, XK_f},
+  {KEYSTROKE_SWITCH_ALL_SCREENS, ControlMask, 1, XK_F},
+  {KEYSTROKE_MINIMIZE, ControlMask, 1, XK_m},
+  {KEYSTROKE_MINIMIZE, ControlMask, 1, XK_M},
+  {KEYSTROKE_LEFT, ControlMask, 1, XK_Left},
+  {KEYSTROKE_LEFT, ControlMask, 1, XK_KP_Left},
+  {KEYSTROKE_UP, ControlMask, 1, XK_Up},
+  {KEYSTROKE_UP, ControlMask, 1, XK_KP_Up},
+  {KEYSTROKE_RIGHT, ControlMask, 1, XK_Right},
+  {KEYSTROKE_RIGHT, ControlMask, 1, XK_KP_Right},
+  {KEYSTROKE_DOWN, ControlMask, 1, XK_Down},
+  {KEYSTROKE_DOWN, ControlMask, 1, XK_KP_Down},
+  {KEYSTROKE_RESIZE, ControlMask, 1, XK_r},
+  {KEYSTROKE_RESIZE, ControlMask, 1, XK_R},
+  {KEYSTROKE_DEFER, ControlMask, 1, XK_e},
+  {KEYSTROKE_DEFER, ControlMask, 1, XK_E},
+  {KEYSTROKE_IGNORE, ControlMask, 1, XK_BackSpace},
+  {KEYSTROKE_IGNORE, 0, 0, XK_Terminate_Server},
+  {KEYSTROKE_FORCE_SYNCHRONIZATION, ControlMask, 1, XK_j},
+  {KEYSTROKE_FORCE_SYNCHRONIZATION, ControlMask, 1, XK_J},
+  {KEYSTROKE_REGIONS_ON_SCREEN, ControlMask, 1, XK_a},
+  {KEYSTROKE_REGIONS_ON_SCREEN, ControlMask, 1, XK_A},
+  {KEYSTROKE_TEST_INPUT, ControlMask, 1, XK_x},
+  {KEYSTROKE_TEST_INPUT, ControlMask, 1, XK_X},
+  {KEYSTROKE_DEACTIVATE_INPUT_DEVICES_GRAB, ControlMask, 1, XK_y},
+  {KEYSTROKE_DEACTIVATE_INPUT_DEVICES_GRAB, ControlMask, 1, XK_Y},
+  {KEYSTROKE_FULLSCREEN, ControlMask | ShiftMask, 1, XK_f},
+  {KEYSTROKE_FULLSCREEN, ControlMask | ShiftMask, 1, XK_F},
+  {KEYSTROKE_VIEWPORT_MOVE_LEFT, ControlMask | ShiftMask, 1, XK_Left},
+  {KEYSTROKE_VIEWPORT_MOVE_LEFT, ControlMask | ShiftMask, 1, XK_KP_Left},
+  {KEYSTROKE_VIEWPORT_MOVE_UP, ControlMask | ShiftMask, 1, XK_Up},
+  {KEYSTROKE_VIEWPORT_MOVE_UP, ControlMask | ShiftMask, 1, XK_KP_Up},
+  {KEYSTROKE_VIEWPORT_MOVE_RIGHT, ControlMask | ShiftMask, 1, XK_Right},
+  {KEYSTROKE_VIEWPORT_MOVE_RIGHT, ControlMask | ShiftMask, 1, XK_KP_Right},
+  {KEYSTROKE_VIEWPORT_MOVE_DOWN, ControlMask | ShiftMask, 1, XK_Down},
+  {KEYSTROKE_VIEWPORT_MOVE_DOWN, ControlMask | ShiftMask, 1, XK_KP_Down},
+  {KEYSTROKE_END_MARKER, 0, 0, 0},
+};
+struct nxagentSpecialKeystrokeMap *map = default_map;
+
+static int modifier_matches(unsigned int mask, int compare_alt_meta, unsigned int state)
+{
+  /* nxagentAltMetaMask needs special handling
+   * it seems to me its an and-ed mask of all possible meta and alt keys
+   * somehow...
+   *
+   * otherwise this function would be just a simple bitop
+   */
+  int ret = 1;
+
+  if (compare_alt_meta) {
+    if (! (state & nxagentAltMetaMask)) {
+      ret = 0;
+    }
+
+    mask &= ~nxagentAltMetaMask;
+  }
+
+  /* all modifiers except meta/alt have to match exactly, extra bits are evil */
+  if ((mask & state) != mask) {
+    ret = 0;
+  }
+
+  return ret;
+}
+
+static int read_binding_from_xmlnode(xmlNode *node, struct nxagentSpecialKeystrokeMap *ret)
+{
+  int successful = 0;
+  struct nxagentSpecialKeystrokeMap new = {0, 0, 0, 0};
+  xmlAttr *attr;
+
+  for (attr = node->properties; attr; attr = attr->next)
+  {
+    /* ignore attributes without data (which should never happen anyways) */
+    if (attr->children->content == NULL)
+    {
+      char *aname = (attr->name)?(attr->name):"unknown";
+      fprintf(stderr, "attribute %s with NULL value", aname);
+      continue;
+    }
+    if (strcmp((char *)attr->name, "action") == 0)
+    {
+      int i;
+      for (i = 0; nxagentSpecialKeystrokeNames[i] != NULL; i++)
+      {
+        if (strcmp(nxagentSpecialKeystrokeNames[i],(char *)attr->children->content) == 0)
+        {
+          /* this relies on the values of enum nxagentSpecialKeystroke and the
+           * indices of nxagentSpecialKeystrokeNames being in sync */
+          new.stroke = i;
+          break;
+        }
+      }
+      continue;
+    }
+    else if (strcmp((char *)attr->name, "key") == 0)
+    {
+      new.keysym = XStringToKeysym((char *)attr->children->content);
+      /* NoSymbol is usually 0, but could there be weird implementations? */
+      if (new.keysym == NoSymbol)
+      {
+        new.keysym = 0;
+      }
+      continue;
+    }
+
+    /* ignore attributes with value="0" or "false", everything else is interpreted as true */
+    if (strcmp((char *)attr->children->content, "0") == 0 || strcmp((char *)attr->children->content, "false") == 0)
+      continue;
+
+    if (strcmp((char *)attr->name, "Mod1") == 0)
+    {
+      new.modifierMask |= Mod1Mask;
+    }
+    else if (strcmp((char *)attr->name, "Mod2") == 0)
+    {
+      new.modifierMask |= Mod2Mask;
+    }
+    else if (strcmp((char *)attr->name, "Mod3") == 0)
+    {
+      new.modifierMask |= Mod3Mask;
+    }
+    else if (strcmp((char *)attr->name, "Mod4") == 0)
+    {
+      new.modifierMask |= Mod4Mask;
+    }
+    else if (strcmp((char *)attr->name, "Control") == 0)
+    {
+      new.modifierMask |= ControlMask;
+    }
+    else if (strcmp((char *)attr->name, "Shift") == 0)
+    {
+      new.modifierMask |= ShiftMask;
+    }
+    else if (strcmp((char *)attr->name, "Lock") == 0)
+    {
+      new.modifierMask |= LockMask;
+    }
+    else if (strcmp((char *)attr->name, "AltMeta") == 0)
+    {
+      new.modifierAltMeta = 1;
+    }
+  }
+
+  if (new.stroke != 0 && new.keysym != 0)
+  {
+    /* keysym and stroke are required, everything else is optional */
+    successful = 1;
+    memcpy(ret, &new, sizeof(struct nxagentSpecialKeystrokeMap));
+  }
+  return successful;
+}
+
+/*
+ * searches a keystroke xml file
+ *
+ * search order:
+ *  - '-keystrokefile' commandline parameter
+ *  - $NXAGENT_KEYSTROKEFILE environment variable
+ *  - $HOME/.nx/config/keystroke.cfg
+ *  - /etc/nx/keystroke.cfg
+ *  - hardcoded traditional NX default settings
+ */
+static void parse_keystroke_file(void)
+{
+  char *filename = NULL;
+
+  char *homefile = "/.nx/config/keystroke.cfg";
+  char *etcfile = "/etc/nx/keystroke.cfg";
+
+  if (nxagentKeystrokeFile != NULL && access(nxagentKeystrokeFile, R_OK) == 0)
+  {
+    filename = strdup(nxagentKeystrokeFile);
+    if (filename == NULL)
+    {
+      fprintf(stderr, "malloc failed");
+      exit(EXIT_FAILURE);
+    }
+  }
+  else if ((filename = getenv("NXAGENT_KEYSTROKEFILE")) != NULL && access(filename, R_OK) == 0)
+  {
+    filename = strdup(filename);
+    if (filename == NULL)
+    {
+      fprintf(stderr, "malloc failed");
+      exit(EXIT_FAILURE);
+    }
+  }
+  else
+  {
+    char *homedir = getenv("HOME");
+    filename = NULL;
+    if (homedir != NULL)
+    {
+      homedir = strdup(homedir);
+      if (homedir == NULL)
+      {
+        fprintf(stderr, "malloc failed");
+	exit(EXIT_FAILURE);
+      }
+      filename = calloc(1, strlen(homefile) + strlen(homedir) + 1);
+      if (filename == NULL)
+      {
+        fprintf(stderr, "malloc failed");
+        exit(EXIT_FAILURE);
+      }
+      strcpy(filename, homedir);
+      strcpy(filename + strlen(homedir), homefile);
+      if (homedir)
+      {
+        free(homedir);
+      }
+    }
+
+    if (access(filename, R_OK) == 0)
+    {
+      /* empty */
+    }
+    else if (access(etcfile, R_OK == 0))
+    {
+      if (filename)
+        free(filename);
+      filename = strdup(etcfile);
+      if (filename == NULL)
+      {
+        fprintf(stderr, "malloc failed");
+        exit(EXIT_FAILURE);
+      }
+    }
+    else
+    {
+      if (filename)
+	free(filename);
+      filename = NULL;
+    }
+  }
+
+  /* now we know which file to read, if any */
+  if (filename)
+  {
+    xmlDoc *doc = NULL;
+    xmlNode *root = NULL;
+    LIBXML_TEST_VERSION
+    doc = xmlReadFile(filename, NULL, 0);
+    if (doc != NULL)
+    {
+      xmlNode *cur = NULL;
+      root = xmlDocGetRootElement(doc);
+
+      for (cur = root; cur; cur = cur->next)
+      {
+        if (cur->type == XML_ELEMENT_NODE && strcmp((char *)cur->name, "keystrokes") == 0)
+	{
+          xmlNode *bindings = NULL;
+          int num = 0;
+          int idx = 0;
+
+          for (bindings = cur->children; bindings; bindings = bindings->next)
+          {
+            if (bindings->type == XML_ELEMENT_NODE && strcmp((char *)bindings->name, "keystroke") == 0)
+            {
+              num++;
+            }
+          }
+          map = calloc((num + 1), sizeof(struct nxagentSpecialKeystrokeMap));
+          if (map == NULL)
+          {
+            fprintf(stderr, "malloc failed");
+            exit(EXIT_FAILURE);
+          }
+
+          for (bindings = cur->children; bindings; bindings = bindings->next)
+          {
+            if (bindings->type == XML_ELEMENT_NODE && strcmp((char *)bindings->name, "keystroke") == 0)
+            {
+              int res = 0;
+              res = read_binding_from_xmlnode(bindings, &(map[idx]));
+              if (res)
+                idx++;
+            }
+          }
+
+          map[idx].stroke = KEYSTROKE_END_MARKER;
+        }
+      }
+
+      xmlFreeDoc(doc);
+      xmlCleanupParser();
+    }
+    else
+    {
+      #ifdef DEBUG
+      fprintf("XML parsing for %s failed\n", filename);
+      #endif
+    }
+    free(filename);
+  }
+}
+
+static enum nxagentSpecialKeystroke find_keystroke(XKeyEvent *X)
+{
+  KeySym keysym = XKeycodeToKeysym(nxagentDisplay, X->keycode, 0);
+  struct nxagentSpecialKeystrokeMap *cur = map;
+
+  if (! nxagentKeystrokeFileParsed)
+  {
+    parse_keystroke_file();
+    nxagentKeystrokeFileParsed = True;
+  }
+
+  enum nxagentSpecialKeystroke ret = KEYSTROKE_NOTHING;
+
+  while ((cur++)->stroke != KEYSTROKE_END_MARKER) {
+    if (cur->keysym == keysym && modifier_matches(cur->modifierMask, cur->modifierAltMeta, X->state)) {
+      return cur->stroke;
+    }
+  }
+
+  return ret;
+}
+
 int nxagentCheckSpecialKeystroke(XKeyEvent *X, enum HandleEventResult *result)
 {
   KeySym sym;
   int index = 0;
+  enum nxagentSpecialKeystroke stroke = find_keystroke(X);
 
   *result = doNothing;
 
@@ -87,257 +453,128 @@ int nxagentCheckSpecialKeystroke(XKeyEvent *X, enum HandleEventResult *result)
     return 1;
   }
 
-  if ((X -> state & nxagentAltMetaMask) &&
-          ((X -> state & (ControlMask | ShiftMask)) == ControlMask))
-  {
-    switch (sym)
-    {
+  switch (stroke) {
+    case KEYSTROKE_DEBUG_TREE:
       #ifdef DEBUG_TREE
-
-      case XK_q:
-      case XK_Q:
-      {
-        *result = doDebugTree;
-
-        break;
-      }
-
-      #endif /* DEBUG_TREE */
-
-      case XK_t:
-      case XK_T:
-      {
-        *result = doCloseSession;
-
-        break;
-      }
-      case XK_f:
-      case XK_F:
-      {
-        if (nxagentOption(Rootless) == False)
-        {
-          *result = doSwitchAllScreens;
-        }
-
-        break;
-      }
-      case XK_m:
-      case XK_M:
-      {
-        if (nxagentOption(Rootless) == False)
-        {
-          *result = doMinimize;
-        }
-
-        break;
-      }
-      case XK_Left:
-      case XK_KP_Left:
-      {
-        if (nxagentOption(Rootless) == False &&
-                nxagentOption(DesktopResize) == False)
-        {
-          *result = doViewportLeft;
-        }
-
-        break;
+      *result = doDebugTree;
+      #endif
+      break;
+    case KEYSTROKE_CLOSE_SESSION:
+      *result = doCloseSession;
+      break;
+    case KEYSTROKE_SWITCH_ALL_SCREENS:
+      if (nxagentOption(Rootless) == False) {
+        *result = doSwitchAllScreens;
       }
-      case XK_Up:
-      case XK_KP_Up:
-      {
-        if (nxagentOption(Rootless) == False &&
-                nxagentOption(DesktopResize) == False)
-        {
-          *result = doViewportUp;
-        }
-
-        break;
+      break;
+    case KEYSTROKE_MINIMIZE:
+      if (nxagentOption(Rootless) == False) {
+        *result = doMinimize;
       }
-      case XK_Right:
-      case XK_KP_Right:
-      {
-        if (nxagentOption(Rootless) == False &&
-                nxagentOption(DesktopResize) == False)
-        {
-          *result = doViewportRight;
-        }
-
-        break;
+      break;
+    case KEYSTROKE_LEFT:
+      if (nxagentOption(Rootless) == False &&
+          nxagentOption(DesktopResize) == False) {
+        *result = doViewportLeft;
       }
-      case XK_Down:
-      case XK_KP_Down:
-      {
-        if (nxagentOption(Rootless) == 0 &&
-                nxagentOption(DesktopResize) == 0)
-        {
-          *result = doViewportDown;
-        }
-
-        break;
+      break;
+    case KEYSTROKE_UP:
+      if (nxagentOption(Rootless) == False &&
+          nxagentOption(DesktopResize) == False) {
+        *result = doViewportUp;
       }
-      case XK_R:
-      case XK_r:
-      {
-        if (nxagentOption(Rootless) == 0)
-        {
-          *result = doSwitchResizeMode;
-        }
-
-        break;
+      break;
+    case KEYSTROKE_RIGHT:
+      if (nxagentOption(Rootless) == False &&
+          nxagentOption(DesktopResize) == False) {
+        *result = doViewportRight;
       }
-      case XK_E:
-      case XK_e:
-      {
-        *result = doSwitchDeferMode;
-
-        break;
+      break;
+    case KEYSTROKE_DOWN:
+      if (nxagentOption(Rootless) == False &&
+          nxagentOption(DesktopResize) == False) {
+        *result = doViewportDown;
       }
-      case XK_BackSpace:
-      case XK_Terminate_Server:
-      {
-        /*
-         * Discard Ctrl-Alt-BackSpace key.
-         */
-
-        return 1;
-
-        break;
+      break;
+    case KEYSTROKE_RESIZE:
+      if (nxagentOption(Rootless) == False) {
+        *result = doSwitchResizeMode;
       }
-
-      case XK_J:
-      case XK_j:
-      {
-        nxagentForceSynchronization = 1;
-
-        return 1;
-      }
-
+      break;
+    case KEYSTROKE_DEFER:
+      *result = doSwitchDeferMode;
+      break;
+    case KEYSTROKE_IGNORE:
+      /* this is used e.g. to ignore C-A-Backspace aka XK_Terminate_Server */
+      return 1;
+      break;
+    case KEYSTROKE_FORCE_SYNCHRONIZATION:
+      nxagentForceSynchronization = 1;
+      break;
+    case KEYSTROKE_REGIONS_ON_SCREEN:
       #ifdef DUMP
-
-      case XK_A:
-      case XK_a:
-      {
-        /*
-         * Used to test the lazy encoding.
-         */
-
-        nxagentRegionsOnScreen();
-
-        return 1;
-      }
-
+      nxagentRegionsOnScreen();
       #endif
-
+      break;
+    case KEYSTROKE_TEST_INPUT:
+      /*
+       * Used to test the input devices state.
+       */
       #ifdef NX_DEBUG_INPUT
-
-      case XK_X:
-      case XK_x:
-      {
-        /*
-         * Used to test the input devices state.
-         */
-
-        if (X -> type == KeyPress)
-        {
-          if (nxagentDebugInputDevices == 0)
-          {
-            fprintf(stderr, "Info: Turning input devices debug ON.\n");
-    
-            nxagentDebugInputDevices = 1;
-          }
-          else
-          {
-            fprintf(stderr, "Info: Turning input devices debug OFF.\n");
-    
-            nxagentDebugInputDevices = 0;
-    
-            nxagentLastInputDevicesDumpTime = 0;
-          }
+      if (X -> type == KeyPress) {
+        if (nxagentDebugInputDevices == 0) {
+          fprintf(stderr, "Info: Turning input devices debug ON.\n");
+          nxagentDebugInputDevices = 1;
+        } else {
+          fprintf(stderr, "Info: Turning input devices debug OFF.\n");
+          nxagentDebugInputDevices = 0;
+          nxagentLastInputDevicesDumpTime = 0;
         }
-
-        return 1;
       }
-
-      case XK_Y:
-      case XK_y:
-      {
-        /*
-         * Used to deactivate input devices grab.
-         */
-
-        if (X -> type == KeyPress)
-        {
-          nxagentDeactivateInputDevicesGrabs();
-        }
-
-        return 1;
+      return 1;
+      #endif
+      break;
+    case KEYSTROKE_DEACTIVATE_INPUT_DEVICES_GRAB:
+      #ifdef NX_DEBUG_INPUT
+      if (X->type == KeyPress) {
+        nxagentDeactivateInputDevicesGrab();
       }
-
+      return 1;
       #endif
-    }
-  }
-  else if ((X -> state & nxagentAltMetaMask) &&
-               ((X -> state & (ControlMask | ShiftMask)) == (ControlMask |
-                   ShiftMask)))
-  {
-    switch (sym)
-    {
-      case XK_f:
-      case XK_F:
-      {
-        if (nxagentOption(Rootless) == 0)
-        {
-          *result = doSwitchFullscreen;
-        }
-
-        break;
+      break;
+    case KEYSTROKE_FULLSCREEN:
+      if (nxagentOption(Rootless) == 0) {
+        *result = doSwitchFullscreen;
       }
-      case XK_Left:
-      case XK_KP_Left:
-      {
-        if (nxagentOption(Rootless) == 0 &&
-                nxagentOption(DesktopResize) == 0)
-        {
-          *result = doViewportMoveLeft;
-        }
-
-        break;
+      break;
+    case KEYSTROKE_VIEWPORT_MOVE_LEFT:
+      if (nxagentOption(Rootless) == 0 &&
+          nxagentOption(DesktopResize) == 0) {
+        *result = doViewportMoveLeft;
       }
-      case XK_Up:
-      case XK_KP_Up:
-      {
-        if (nxagentOption(Rootless) == 0 &&
-                nxagentOption(DesktopResize) == 0)
-        {
-          *result = doViewportMoveUp;
-        }
-
-        break;
+      break;
+    case KEYSTROKE_VIEWPORT_MOVE_UP:
+      if (nxagentOption(Rootless) == 0 &&
+          nxagentOption(DesktopResize) == 0) {
+        *result = doViewportMoveUp;
       }
-      case XK_Right:
-      case XK_KP_Right:
-      {
-        if (nxagentOption(Rootless) == 0 &&
-                nxagentOption(DesktopResize) == 0)
-        {
-          *result = doViewportMoveRight;
-        }
-
-        break;
+      break;
+    case KEYSTROKE_VIEWPORT_MOVE_RIGHT:
+      if (nxagentOption(Rootless) == 0 &&
+          nxagentOption(DesktopResize) == 0) {
+        *result = doViewportMoveRight;
       }
-      case XK_Down:
-      case XK_KP_Down:
-      {
-        if (nxagentOption(Rootless) == 0 &&
-                nxagentOption(DesktopResize) == 0)
-        {
-          *result = doViewportMoveDown;
-        }
-
-        break;
+      break;
+    case KEYSTROKE_VIEWPORT_MOVE_DOWN:
+      if (nxagentOption(Rootless) == 0 &&
+          nxagentOption(DesktopResize) == 0) {
+        *result = doViewportMoveDown;
       }
-    }
+      break;
+    case KEYSTROKE_NOTHING: /* do nothing. difference to KEYSTROKE_IGNORE is the return value */
+    case KEYSTROKE_END_MARKER: /* just to make gcc STFU */
+    case KEYSTROKE_MAX:
+      break;
   }
-
   return (*result == doNothing) ? 0 : 1;
 }
diff --git a/nx-X11/programs/Xserver/hw/nxagent/Keystroke.h b/nx-X11/programs/Xserver/hw/nxagent/Keystroke.h
index ef71a88..ecfb2c4 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Keystroke.h
+++ b/nx-X11/programs/Xserver/hw/nxagent/Keystroke.h
@@ -24,4 +24,51 @@ extern int nxagentCheckSpecialKeystroke(XKeyEvent*, enum HandleEventResult*);
 
 unsigned int nxagentAltMetaMask;
 
+/* keep this sorted, do not rely on any numerical value in this enum, and be aware
+ * that KEYSTROKE_MAX may be used in a malloc */
+
+/* also be aware that if changing any numerical values, you also need to change values
+ * Keystroke.c nxagentSpecialKeystrokeNames */
+enum nxagentSpecialKeystroke {
+	/* 0 is used as end marker */
+	KEYSTROKE_END_MARKER = 0,
+	KEYSTROKE_CLOSE_SESSION = 1,
+	KEYSTROKE_SWITCH_ALL_SCREENS = 2,
+	KEYSTROKE_MINIMIZE = 3,
+	KEYSTROKE_LEFT = 4,
+	KEYSTROKE_UP = 5,
+	KEYSTROKE_RIGHT = 6,
+	KEYSTROKE_DOWN = 7,
+	KEYSTROKE_RESIZE = 8,
+	KEYSTROKE_DEFER = 9,
+	KEYSTROKE_IGNORE = 10,
+	KEYSTROKE_FORCE_SYNCHRONIZATION = 11,
+
+	/* stuff used for debugging, probably not useful for most people */
+	KEYSTROKE_DEBUG_TREE = 12,
+	KEYSTROKE_REGIONS_ON_SCREEN = 13,
+	KEYSTROKE_TEST_INPUT = 14,
+	KEYSTROKE_DEACTIVATE_INPUT_DEVICES_GRAB = 15,
+
+	KEYSTROKE_FULLSCREEN = 16,
+	KEYSTROKE_VIEWPORT_MOVE_LEFT = 17,
+	KEYSTROKE_VIEWPORT_MOVE_UP = 18,
+	KEYSTROKE_VIEWPORT_MOVE_RIGHT = 19,
+	KEYSTROKE_VIEWPORT_MOVE_DOWN = 20,
+
+	KEYSTROKE_NOTHING = 21,
+
+	/* insert more here, increment KEYSTROKE_MAX accordingly.
+	 * then update string translation below */
+
+	KEYSTROKE_MAX=22,
+};
+
+struct nxagentSpecialKeystrokeMap {
+	enum nxagentSpecialKeystroke stroke;
+	unsigned int modifierMask; /* everything except alt/meta */
+	int modifierAltMeta; /* modifier combination should include alt/meta */
+	KeySym keysym;
+};
+
 #endif /* __Keystroke_H__ */
-- 
1.7.10.4

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