code.delx.au - spectrwm/blob - lib/swm_hack.c

   1 /* $scrotwm$ */
   2 /*
   3  * Copyright (c) 2009 Marco Peereboom <marco@peereboom.us>
   4  * Copyright (c) 2009 Ryan McBride <mcbride@countersiege.com>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 /*
  19  * Copyright (C) 2005-2007 Carsten Haitzler
  20  * Copyright (C) 2006-2007 Kim Woelders
  21  *
  22  * Permission is hereby granted, free of charge, to any person obtaining a copy
  23  * of this software and associated documentation files (the "Software"), to
  24  * deal in the Software without restriction, including without limitation the
  25  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  26  * sell copies of the Software, and to permit persons to whom the Software is
  27  * furnished to do so, subject to the following conditions:
  28  *
  29  * The above copyright notice and this permission notice shall be included in
  30  * all copies of the Software, its documentation and marketing & publicity
  31  * materials, and acknowledgment shall be given in the documentation, materials
  32  * and software packages that this Software was used.
  33  *
  34  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  35  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  36  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  37  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  38  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  39  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  40  */
  41 /*
  42  * Basic hack mechanism (dlopen etc.) taken from e_hack.c in e17.
  43  */
  44 #include <string.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <dlfcn.h>
  48 #include <X11/Xlib.h>
  49 #include <X11/X.h>
  50 #include <X11/Xatom.h>
  51 #include <X11/Intrinsic.h>
  52
  53 /* dlopened libs so we can find the symbols in the real one to call them */
  54 static void             *lib_xlib = NULL;
  55 static void             *lib_xtlib = NULL;
  56
  57 static Window           root = None;
  58 static int              xterm = 0;
  59 static Display          *dpy = NULL;
  60
  61 /* Find our root window */
  62 static              Window
  63 MyRoot(Display * dpy)
  64 {
  65         char               *s;
  66
  67         if (root != None)
  68                 return root;
  69
  70         root = DefaultRootWindow(dpy);
  71
  72         s = getenv("ENL_WM_ROOT");
  73         if (!s)
  74                 return root;
  75
  76         sscanf(s, "%lx", &root);
  77         return root;
  78 }
  79
  80 #define SWM_PROPLEN     (16)
  81 void
  82 set_property(Display *dpy, Window id, char *name, char *val)
  83 {
  84         Atom                    atom = 0;
  85         char                    prop[SWM_PROPLEN];
  86
  87         /* Try to update the window's workspace property */
  88         atom = XInternAtom(dpy, name, False);
  89         if (atom)
  90                 if (snprintf(prop, SWM_PROPLEN, "%s", val) < SWM_PROPLEN)
  91                         XChangeProperty(dpy, id, atom, XA_STRING,
  92                             8, PropModeReplace, prop, SWM_PROPLEN);
  93 }
  94
  95 typedef             Window(CWF) (Display * _display, Window _parent, int _x,
  96                                  int _y, unsigned int _width,
  97                                  unsigned int _height,
  98                                  unsigned int _border_width, int _depth,
  99                                  unsigned int _class, Visual * _visual,
 100                                  unsigned long _valuemask,
 101                                  XSetWindowAttributes * _attributes);
 102
 103 /* XCreateWindow intercept hack */
 104 Window
 105 XCreateWindow(Display * display, Window parent, int x, int y,
 106    unsigned int width, unsigned int height,
 107    unsigned int border_width,
 108    int depth, unsigned int clss, Visual * visual,
 109    unsigned long valuemask, XSetWindowAttributes * attributes)
 110 {
 111         static CWF      *func = NULL;
 112         char            *env;
 113         Window          id;
 114
 115         /* find the real Xlib and the real X function */
 116         if (!lib_xlib)
 117                 lib_xlib = dlopen("libX11.so", RTLD_GLOBAL | RTLD_LAZY);
 118         if (!func) {
 119                 func = (CWF *) dlsym(lib_xlib, "XCreateWindow");
 120                 dpy = display;
 121         }
 122
 123         if (parent == DefaultRootWindow(display))
 124                 parent = MyRoot(display);
 125
 126         id = (*func) (display, parent, x, y, width, height, border_width,
 127             depth, clss, visual, valuemask, attributes);
 128
 129         if (id) {
 130                 if ((env = getenv("_SWM_WS")) != NULL)
 131                         set_property(display, id, "_SWM_WS", env);
 132                 if ((env = getenv("_SWM_PID")) != NULL)
 133                         set_property(display, id, "_SWM_PID", env);
 134                 if ((env = getenv("_SWM_XTERM_FONTADJ")) != NULL) {
 135                         unsetenv("_SWM_XTERM_FONTADJ");
 136                         xterm = 1;
 137                 }
 138         }
 139         return (id);
 140 }
 141
 142 typedef             Window(CSWF) (Display * _display, Window _parent, int _x,
 143                                   int _y, unsigned int _width,
 144                                   unsigned int _height,
 145                                   unsigned int _border_width,
 146                                   unsigned long _border,
 147                                   unsigned long _background);
 148
 149 /* XCreateSimpleWindow intercept hack */
 150 Window
 151 XCreateSimpleWindow(Display * display, Window parent, int x, int y,
 152     unsigned int width, unsigned int height,
 153     unsigned int border_width,
 154     unsigned long border, unsigned long background)
 155 {
 156         static CSWF     *func = NULL;
 157         char            *env;
 158         Window          id;
 159
 160         /* find the real Xlib and the real X function */
 161         if (!lib_xlib)
 162                 lib_xlib = dlopen("libX11.so", RTLD_GLOBAL | RTLD_LAZY);
 163         if (!func)
 164                 func = (CSWF *) dlsym(lib_xlib, "XCreateSimpleWindow");
 165
 166         if (parent == DefaultRootWindow(display))
 167                 parent = MyRoot(display);
 168
 169         id = (*func) (display, parent, x, y, width, height,
 170             border_width, border, background);
 171
 172         if (id) {
 173                 if ((env = getenv("_SWM_WS")) != NULL)
 174                         set_property(display, id, "_SWM_WS", env);
 175                 if ((env = getenv("_SWM_PID")) != NULL)
 176                         set_property(display, id, "_SWM_PID", env);
 177                 if ((env = getenv("_SWM_XTERM_FONTADJ")) != NULL) {
 178                         unsetenv("_SWM_XTERM_FONTADJ");
 179                         xterm = 1;
 180                 }
 181         }
 182         return (id);
 183 }
 184
 185 typedef int         (RWF) (Display * _display, Window _window, Window _parent,
 186                            int x, int y);
 187
 188 /* XReparentWindow intercept hack */
 189 int
 190 XReparentWindow(Display * display, Window window, Window parent, int x, int y)
 191 {
 192         static RWF         *func = NULL;
 193
 194         /* find the real Xlib and the real X function */
 195         if (!lib_xlib)
 196                 lib_xlib = dlopen("libX11.so", RTLD_GLOBAL | RTLD_LAZY);
 197         if (!func)
 198                 func = (RWF *) dlsym(lib_xlib, "XReparentWindow");
 199
 200         if (parent == DefaultRootWindow(display))
 201                 parent = MyRoot(display);
 202
 203         return (*func) (display, window, parent, x, y);
 204 }
 205
 206 typedef         void (ANEF) (XtAppContext app_context, XEvent *event_return);
 207 int             evcount = 0;
 208
 209 /*
 210  * XtAppNextEvent Intercept Hack
 211  * Normally xterm rejects "synthetic" (XSendEvent) events to prevent spoofing.
 212  * We don't want to disable this completely, it's insecure. But hook here
 213  * and allow these mostly harmless ones that we use to adjust fonts.
 214  */
 215 void
 216 XtAppNextEvent(XtAppContext app_context, XEvent *event_return)
 217 {
 218         static ANEF     *func = NULL;
 219         static int      kp_add = 0, kp_subtract = 0;
 220
 221         /* find the real Xlib and the real X function */
 222         if (!lib_xtlib)
 223                 lib_xtlib = dlopen("libXt.so", RTLD_GLOBAL | RTLD_LAZY);
 224         if (!func) {
 225                 func = (ANEF *) dlsym(lib_xtlib, "XtAppNextEvent");
 226                 if (dpy != NULL) {
 227                         kp_add = XKeysymToKeycode(dpy, XK_KP_Add);
 228                         kp_subtract = XKeysymToKeycode(dpy, XK_KP_Subtract);
 229                 }
 230         }
 231
 232         (*func) (app_context, event_return);
 233
 234         /* Return here if it's not an Xterm. */
 235         if (!xterm)
 236                 return;
 237
 238         /* Allow spoofing of font change keystrokes. */
 239         if ((event_return->type == KeyPress ||
 240            event_return->type == KeyRelease) &&
 241            event_return->xkey.state == ShiftMask &&
 242            (event_return->xkey.keycode == kp_add ||
 243            event_return->xkey.keycode == kp_subtract))
 244                 event_return->xkey.send_event = 0;
 245 }