nxagent: store remote keyboard in global variables

nx-X11/programs/Xserver/hw/nxagent/Keyboard.c

@@ -78,10 +78,9 @@ is" without express or implied warranty.
 
 #include <errno.h>
 
-static int nxagentXkbGetNames(char **rules, char **model, char **layout,
-                                  char **variant, char **options);
+void nxagentXkbGetNames(void);
 
-static void nxagentKeycodeConversionSetup(char *rules, char *model);
+void nxagentKeycodeConversionSetup(void);
 
 void nxagentWriteKeyboardFile(char *rules, char *model, char *layout, char *variant, char *options);
 
@@ -140,6 +139,13 @@ extern        Status        XkbGetControls(
 extern int XkbDfltRepeatDelay;
 extern int XkbDfltRepeatInterval;
 
+/* xkb configuration of the real X server */
+static char *nxagentRemoteRules = NULL;
+static char *nxagentRemoteModel = NULL;
+static char *nxagentRemoteLayout = NULL;
+static char *nxagentRemoteVariant = NULL;
+static char *nxagentRemoteOptions = NULL;
+
 #endif /* XKB */
 
 /*
@@ -571,8 +577,10 @@ int nxagentKeyboardProc(DeviceIntPtr pDev, int onoff)
   CARD8 modmap[MAP_LENGTH];
   int i, j;
   XKeyboardState values;
+#ifdef XKB
   char *model = NULL, *layout = NULL;
   XkbDescPtr xkb = NULL;
+#endif
 
   switch (onoff)
   {
@@ -694,20 +702,13 @@ N/A
       keySyms.mapWidth = mapWidth;
       keySyms.map = keymap;
 
-      if (XkbQueryExtension(nxagentDisplay,
-                            &nxagentXkbInfo.Opcode,
-                            &nxagentXkbInfo.EventBase,
-                            &nxagentXkbInfo.ErrorBase,
-                            &nxagentXkbInfo.MajorVersion,
-                            &nxagentXkbInfo.MinorVersion) == 0)
+#ifdef XKB
+      if (!nxagentGetRemoteXkbExtension())
       {
-          ErrorF("Unable to initialize XKEYBOARD extension.\n");
-          goto XkbError;
+        ErrorF("Unable to query XKEYBOARD extension.\n");
+        goto XkbError;
       }
 
-
-#ifdef XKB
-
       if (noXkbExtension) {
         #ifdef TEST
         fprintf(stderr, "nxagentKeyboardProc: No XKB extension.\n");
@@ -838,63 +839,47 @@ XkbError:
         fprintf(stderr, "nxagentKeyboardProc: Init XKB extension.\n");
         #endif
 
+        if (nxagentRemoteRules && nxagentRemoteModel)
         {
-          char *remoterules = NULL;
-          char *remotemodel = NULL;
-          char *remotelayout = NULL;
-          char *remotevariant = NULL;
-          char *remoteoptions = NULL;
+          #ifdef DEBUG
+          fprintf(stderr, "%s: Remote: [rules='%s',model='%s',layout='%s',variant='%s',options='%s'].\n",
+                  __func__, nxagentRemoteRules, nxagentRemoteModel, nxagentRemoteLayout, nxagentRemoteVariant, nxagentRemoteOptions);
+          #endif
 
-          unsigned int remoteruleslen = nxagentXkbGetNames(&remoterules, &remotemodel, &remotelayout,
-                                                           &remotevariant, &remoteoptions);
+          /*
+           * Keyboard has always been tricky with nxagent. For that
+           * reason X2Go offers "auto" keyboard configuration. You can
+           * specify it in the client side session configuration. In
+           * "auto" mode x2goserver expects nxagent to write the
+           * remote keyboard config to a file on startup and
+           * x2goserver would then pick that file and pass it to
+           * setxkbmap. This functionality is obsoleted by the "clone"
+           * stuff but we still need it because x2goserver does not
+           * know about that yet. Once x2go starts using clone
+           * we can drop this here.
+           */
+          nxagentWriteKeyboardFile(nxagentRemoteRules, nxagentRemoteModel, nxagentRemoteLayout, nxagentRemoteVariant, nxagentRemoteOptions);
 
-          if (remoteruleslen && remoterules && remotemodel)
+          /* Only setup keycode conversion if we are NOT in clone mode */
+          if (nxagentKeyboard && (strcmp(nxagentKeyboard, "clone") == 0))
           {
-            #ifdef DEBUG
-            fprintf(stderr, "%s: Remote: [rules='%s',model='%s',layout='%s',variant='%s',options='%s'].\n",
-                    __func__, remoterules, remotemodel, remotelayout, remotevariant, remoteoptions);
-            #endif
-
-            /*
-             * Keyboard has always been tricky with nxagent. For that
-             * reason X2Go offers "auto" keyboard configuration. You can
-             * specify it in the client side session configuration. In
-             * "auto" mode x2goserver expects nxagent to write the
-             * remote keyboard config to a file on startup and
-             * x2goserver would then pick that file and pass it to
-             * setxkbmap. This functionality is obsoleted by the "clone"
-             * stuff but we still need it because x2goserver does not
-             * know about that yet. Once x2go starts using clone we can
-             * drop this here.
-             */
-            nxagentWriteKeyboardFile(remoteruleslen, remoterules, remotemodel, remotelayout, remotevariant, remoteoptions);
-
-            /* Only setup keycode conversion if we are NOT in clone mode */
-            if (nxagentKeyboard && (strcmp(nxagentKeyboard, "clone") == 0))
-            {
-              free(rules); rules = strdup(remoterules);
-              free(model); model = strdup(remotemodel);
-              free(layout); layout = strdup(remotelayout);
-              free(variant); variant = strdup(remotevariant);
-              free(options); options = strdup(remoteoptions);
-            }
-            else
-            {
-              nxagentKeycodeConversionSetup(remoterules, remotemodel);
-            }
+            free(rules); rules = strdup(nxagentRemoteRules);
+            free(model); model = strdup(nxagentRemoteModel);
+            free(layout); layout = strdup(nxagentRemoteLayout);
+            free(variant); variant = strdup(nxagentRemoteVariant);
+            free(options); options = strdup(nxagentRemoteOptions);
           }
-          #ifdef DEBUG
           else
           {
-            fprintf(stderr, "%s: Failed to retrieve remote rules.\n", __func__);
-          }
-          #endif
-
-          if (remoterules)
-          {
-            XFree(remoterules);
+            nxagentKeycodeConversionSetup();
           }
         }
+        #ifdef DEBUG
+        else
+        {
+          fprintf(stderr, "%s: Failed to retrieve remote rules.\n", __func__);
+        }
+        #endif
 
         xkb = XkbGetKeyboard(nxagentDisplay, XkbGBN_AllComponentsMask, XkbUseCoreKbd);
 
@@ -1551,8 +1536,16 @@ void nxagentTuneXkbWrapper(void)
   }
 }
 
-static int nxagentXkbGetNames(char **rules, char **model, char **layout,
-                                  char **variant, char **options)
+void nxagentXkbClearNames(void)
+{
+  free(nxagentRemoteRules); nxagentRemoteRules = NULL;
+  free(nxagentRemoteModel); nxagentRemoteModel = NULL;
+  free(nxagentRemoteLayout); nxagentRemoteLayout = NULL;
+  free(nxagentRemoteVariant); nxagentRemoteVariant = NULL;
+  free(nxagentRemoteOptions); nxagentRemoteOptions = NULL;
+}
+
+void nxagentXkbGetNames(void)
 {
   Atom atom;
   #ifdef _XSERVER64
@@ -1567,28 +1560,25 @@ static int nxagentXkbGetNames(char **rules, char **model, char **layout,
   char *name;
   Status result;
 
-  data = name = NULL;
-
-  *rules = NULL;
-  *model = NULL;
-  *layout = NULL;
-  *variant = NULL;
-  *options = NULL;
+  if (nxagentRemoteRules)
+    return;
 
   atom = XInternAtom(nxagentDisplay, "_XKB_RULES_NAMES", 1);
 
   if (atom == 0)
   {
-    return 0; 
+    return;
   }
 
+  data = name = NULL;
+
   result = XGetWindowProperty(nxagentDisplay, DefaultRootWindow(nxagentDisplay),
                                   atom, 0, 256, 0, XA_STRING, &type, &format,
                                       &n, &after, (unsigned char **)&data);
 
   if (result != Success || !data)
   {
-    return 0;
+    return;
   }
 
   if ((after > 0) || (type != XA_STRING) || (format != 8))
@@ -1596,7 +1586,7 @@ static int nxagentXkbGetNames(char **rules, char **model, char **layout,
     if (data)
     {
       XFree(data);
-      return 0;
+      return;
     }
   }
 
@@ -1604,35 +1594,37 @@ static int nxagentXkbGetNames(char **rules, char **model, char **layout,
 
   if (name < data + n)
   {
-    *rules = name;
+    nxagentRemoteRules = strdup(name);
     name += strlen(name) + 1;
   }
 
   if (name < data + n)
   {
-    *model = name;
+    nxagentRemoteModel = strdup(name);
     name += strlen(name) + 1;
   }
 
   if (name < data + n)
   {
-    *layout = name;
+    nxagentRemoteLayout = strdup(name);
     name += strlen(name) + 1;
   }
 
   if (name < data + n)
   {
-    *variant = name;
+    nxagentRemoteVariant = strdup(name);
     name += strlen(name) + 1;
   }
 
   if (name < data + n)
   {
-    *options = name;
+    nxagentRemoteOptions = strdup(name);
     name += strlen(name) + 1;
   }
 
-  return n;
+  XFree(data);
+
+  return;
 }
 
 void writeKeyboardfileData(FILE *out, char *rules, char *model, char *layout, char *variant, char *options)
@@ -1697,7 +1689,7 @@ void nxagentWriteKeyboardFile(char *rules, char *model, char *layout, char *vari
   }
 }
 
-void nxagentKeycodeConversionSetup(char * rules, char * model)
+void nxagentKeycodeConversionSetup(void)
 {
   if (nxagentOption(KeycodeConversion) == KeycodeConversionOff)
   {
@@ -1711,9 +1703,9 @@ void nxagentKeycodeConversionSetup(char * rules, char * model)
   }
   else
   {
-    if (rules && model &&
-        (strcmp(rules, "evdev") == 0 ||
-         strcmp(model, "evdev") == 0))
+    if (nxagentRemoteRules && nxagentRemoteModel &&
+        (strcmp(nxagentRemoteRules, "evdev") == 0 ||
+         strcmp(nxagentRemoteModel, "evdev") == 0))
     {
       #ifdef DEBUG
       fprintf(stderr, "%s: Activating KeyCode conversion.\n", __func__);
@@ -1736,40 +1728,39 @@ void nxagentKeycodeConversionSetup(char * rules, char * model)
 
 void nxagentResetKeycodeConversion(void)
 {
-  int result;
-  XkbAgentInfoRec info;
-
-  result = XkbQueryExtension(nxagentDisplay, &info.Opcode, &info.EventBase,
-                                 &info.ErrorBase, &info.MajorVersion,
-                                     &info.MinorVersion);
-
-  if (result != 0)
+  if (nxagentXkbInfo.Opcode != -1)
   {
-    char *remoterules = NULL;
-    char *remotemodel = NULL;
-    char *remotelayout = NULL;
-    char *remotevariant = NULL;
-    char *remoteoptions = NULL;
-    unsigned int remoteruleslen;
+    nxagentKeycodeConversionSetup();
+  }
+  else
+  {
+    nxagentKeycodeConversion = False;
+  }
+}
 
-    remoteruleslen = nxagentXkbGetNames(&remoterules, &remotemodel, &remotelayout,
-                                        &remotevariant, &remoteoptions);
+Bool nxagentGetRemoteXkbExtension(void)
+{
+  Bool result;
 
-    if (remoteruleslen && remoterules && remotemodel)
-      nxagentKeycodeConversionSetup(remoterules, remotemodel);
+  nxagentXkbInfo.Opcode = nxagentXkbInfo.EventBase = nxagentXkbInfo.ErrorBase = nxagentXkbInfo.MajorVersion = nxagentXkbInfo.MinorVersion = -1;
+  nxagentXkbClearNames();
 
-    if (remoterules)
-      XFree(remoterules);
+  if ((result = XkbQueryExtension(nxagentDisplay,
+                                 &nxagentXkbInfo.Opcode,
+                                 &nxagentXkbInfo.EventBase,
+                                 &nxagentXkbInfo.ErrorBase,
+                                 &nxagentXkbInfo.MajorVersion,
+                                 &nxagentXkbInfo.MinorVersion)))
+  {
+    nxagentXkbGetNames();
   }
+  #ifdef WARNING
   else
   {
-    #ifdef WARNING
-    fprintf(stderr, "nxagentResetKeycodeConversion: "
-                "WARNING! Failed to query XKB extension.\n");
-    #endif
-
-    nxagentKeycodeConversion = False;
+    fprintf(stderr, "%s: WARNING! Failed to query XKB extension.\n", __func__);
   }
-}
+  #endif
 
+  return result;
+}
 #endif /* XKB */

nx-X11/programs/Xserver/hw/nxagent/Keyboard.h

@@ -119,6 +119,7 @@ void nxagentTuneXkbWrapper(void);
 
 void nxagentResetKeycodeConversion(void);
 
+Bool nxagentGetRemoteXkbExtension(void);
 #endif
 
 CARD8 nxagentConvertKeycode(CARD8 k);

nx-X11/programs/Xserver/hw/nxagent/Reconnect.c

@@ -584,6 +584,9 @@ Bool nxagentReconnectSession(void)
     goto nxagentReconnectError;
   }
 
+  /* Update remote XKB information */
+  nxagentGetRemoteXkbExtension();
+
   /* if there's no keyboard definition in the options file
      restore the previous value. */
   #ifdef DEBUG