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

   1 /*
   2  * Copyright (c) 2009 Marco Peereboom <marco@peereboom.us>
   3  * Copyright (c) 2009 Ryan McBride <mcbride@countersiege.com>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17 /*
  18  * Copyright (C) 2005-2007 Carsten Haitzler
  19  * Copyright (C) 2006-2007 Kim Woelders
  20  *
  21  * Permission is hereby granted, free of charge, to any person obtaining a copy
  22  * of this software and associated documentation files (the "Software"), to
  23  * deal in the Software without restriction, including without limitation the
  24  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  25  * sell copies of the Software, and to permit persons to whom the Software is
  26  * furnished to do so, subject to the following conditions:
  27  *
  28  * The above copyright notice and this permission notice shall be included in
  29  * all copies of the Software, its documentation and marketing & publicity
  30  * materials, and acknowledgment shall be given in the documentation, materials
  31  * and software packages that this Software was used.
  32  *
  33  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  34  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  35  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  36  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  37  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  38  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  39  */
  40 /*
  41  * Basic hack mechanism (dlopen etc.) taken from e_hack.c in e17.
  42  */
  43 #include <string.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <dlfcn.h>
  47 #include <X11/Xlib.h>
  48 #include <X11/X.h>
  49 #include <X11/Xatom.h>
  50 #include <X11/Intrinsic.h>
  51
  52 /* dlopened libs so we can find the symbols in the real one to call them */
  53 static void             *lib_xlib = NULL;
  54 static void             *lib_xtlib = NULL;
  55
  56 static Window           root = None;
  57 static int              xterm = 0;
  58 static Display          *display = NULL;
  59
  60 void    set_property(Display *, Window, char *, char *);
  61
  62 /* Find our root window */
  63 static              Window
  64 MyRoot(Display * dpy)
  65 {
  66         char               *s;
  67
  68         if (root != None)
  69                 return root;
  70
  71         root = DefaultRootWindow(dpy);
  72
  73         s = getenv("ENL_WM_ROOT");
  74         if (!s)
  75                 return root;
  76
  77         sscanf(s, "%lx", &root);
  78         return root;
  79 }
  80
  81
  82 typedef Atom    (XIA) (Display *display, char *atom_name, Bool
  83                     only_if_exists);
  84
  85 typedef int     (XCP) (Display *display, Window w, Atom property,
  86                     Atom type, int format, int mode, unsigned char *data,
  87                     int nelements);
  88
  89 #define SWM_PROPLEN     (16)
  90 void
  91 set_property(Display *dpy, Window id, char *name, char *val)
  92 {
  93         Atom                    atom = 0;
  94         char                    prop[SWM_PROPLEN];
  95         static XIA              *xia = NULL;
  96         static XCP              *xcp = NULL;
  97
  98         /* find the real Xlib and the real X function */
  99         if (!lib_xlib)
 100                 lib_xlib = dlopen("libX11.so", RTLD_GLOBAL | RTLD_LAZY);
 101         if (!xia)
 102                 xia = (XIA *) dlsym(lib_xlib, "XInternAtom");
 103         if (!xcp)
 104                 xcp = (XCP *) dlsym(lib_xlib, "XChangeProperty");
 105
 106         /* Try to update the window's workspace property */
 107         atom = (*xia)(dpy, name, False);
 108         if (atom)
 109                 if (snprintf(prop, SWM_PROPLEN, "%s", val) < SWM_PROPLEN)
 110                         (*xcp)(dpy, id, atom, XA_STRING,
 111                             8, PropModeReplace, (unsigned char *)prop,
 112                             strlen((char *)prop));
 113 }
 114
 115 typedef             Window(CWF) (Display * _display, Window _parent, int _x,
 116                                  int _y, unsigned int _width,
 117                                  unsigned int _height,
 118                                  unsigned int _border_width, int _depth,
 119                                  unsigned int _class, Visual * _visual,
 120                                  unsigned long _valuemask,
 121                                  XSetWindowAttributes * _attributes);
 122
 123 /* XCreateWindow intercept hack */
 124 Window
 125 XCreateWindow(Display *dpy, Window parent, int x, int y,
 126    unsigned int width, unsigned int height,
 127    unsigned int border_width,
 128    int depth, unsigned int clss, Visual * visual,
 129    unsigned long valuemask, XSetWindowAttributes * attributes)
 130 {
 131         static CWF      *func = NULL;
 132         char            *env;
 133         Window          id;
 134
 135         /* find the real Xlib and the real X function */
 136         if (!lib_xlib)
 137                 lib_xlib = dlopen("libX11.so", RTLD_GLOBAL | RTLD_LAZY);
 138         if (!func) {
 139                 func = (CWF *) dlsym(lib_xlib, "XCreateWindow");
 140                 display = dpy;
 141         }
 142
 143         if (parent == DefaultRootWindow(dpy))
 144                 parent = MyRoot(dpy);
 145
 146         id = (*func) (dpy, parent, x, y, width, height, border_width,
 147             depth, clss, visual, valuemask, attributes);
 148
 149         if (id) {
 150                 if ((env = getenv("_SWM_WS")) != NULL)
 151                         set_property(dpy, id, "_SWM_WS", env);
 152                 if ((env = getenv("_SWM_PID")) != NULL)
 153                         set_property(dpy, id, "_SWM_PID", env);
 154                 if ((env = getenv("_SWM_XTERM_FONTADJ")) != NULL) {
 155                         unsetenv("_SWM_XTERM_FONTADJ");
 156                         xterm = 1;
 157                 }
 158         }
 159         return (id);
 160 }
 161
 162 typedef             Window(CSWF) (Display * _display, Window _parent, int _x,
 163                                   int _y, unsigned int _width,
 164                                   unsigned int _height,
 165                                   unsigned int _border_width,
 166                                   unsigned long _border,
 167                                   unsigned long _background);
 168
 169 /* XCreateSimpleWindow intercept hack */
 170 Window
 171 XCreateSimpleWindow(Display *dpy, Window parent, int x, int y,
 172     unsigned int width, unsigned int height,
 173     unsigned int border_width,
 174     unsigned long border, unsigned long background)
 175 {
 176         static CSWF     *func = NULL;
 177         char            *env;
 178         Window          id;
 179
 180         /* find the real Xlib and the real X function */
 181         if (!lib_xlib)
 182                 lib_xlib = dlopen("libX11.so", RTLD_GLOBAL | RTLD_LAZY);
 183         if (!func)
 184                 func = (CSWF *) dlsym(lib_xlib, "XCreateSimpleWindow");
 185
 186         if (parent == DefaultRootWindow(dpy))
 187                 parent = MyRoot(dpy);
 188
 189         id = (*func) (dpy, parent, x, y, width, height,
 190             border_width, border, background);
 191
 192         if (id) {
 193                 if ((env = getenv("_SWM_WS")) != NULL)
 194                         set_property(dpy, id, "_SWM_WS", env);
 195                 if ((env = getenv("_SWM_PID")) != NULL)
 196                         set_property(dpy, id, "_SWM_PID", env);
 197                 if ((env = getenv("_SWM_XTERM_FONTADJ")) != NULL) {
 198                         unsetenv("_SWM_XTERM_FONTADJ");
 199                         xterm = 1;
 200                 }
 201         }
 202         return (id);
 203 }
 204
 205 typedef int         (RWF) (Display * _display, Window _window, Window _parent,
 206                            int x, int y);
 207
 208 /* XReparentWindow intercept hack */
 209 int
 210 XReparentWindow(Display *dpy, Window window, Window parent, int x, int y)
 211 {
 212         static RWF         *func = NULL;
 213
 214         /* find the real Xlib and the real X function */
 215         if (!lib_xlib)
 216                 lib_xlib = dlopen("libX11.so", RTLD_GLOBAL | RTLD_LAZY);
 217         if (!func)
 218                 func = (RWF *) dlsym(lib_xlib, "XReparentWindow");
 219
 220         if (parent == DefaultRootWindow(dpy))
 221                 parent = MyRoot(dpy);
 222
 223         return (*func) (dpy, window, parent, x, y);
 224 }
 225
 226 typedef         void (ANEF) (XtAppContext app_context, XEvent *event_return);
 227 int             evcount = 0;
 228
 229 /*
 230  * XtAppNextEvent Intercept Hack
 231  * Normally xterm rejects "synthetic" (XSendEvent) events to prevent spoofing.
 232  * We don't want to disable this completely, it's insecure. But hook here
 233  * and allow these mostly harmless ones that we use to adjust fonts.
 234  */
 235 void
 236 XtAppNextEvent(XtAppContext app_context, XEvent *event_return)
 237 {
 238         static ANEF     *func = NULL;
 239         static KeyCode  kp_add = 0, kp_subtract = 0;
 240
 241         /* find the real Xlib and the real X function */
 242         if (!lib_xtlib)
 243                 lib_xtlib = dlopen("libXt.so", RTLD_GLOBAL | RTLD_LAZY);
 244         if (!func) {
 245                 func = (ANEF *) dlsym(lib_xtlib, "XtAppNextEvent");
 246                 if (display != NULL) {
 247                         kp_add = XKeysymToKeycode(display, XK_KP_Add);
 248                         kp_subtract = XKeysymToKeycode(display, XK_KP_Subtract);
 249                 }
 250         }
 251
 252         (*func) (app_context, event_return);
 253
 254         /* Return here if it's not an Xterm. */
 255         if (!xterm)
 256                 return;
 257
 258         /* Allow spoofing of font change keystrokes. */
 259         if ((event_return->type == KeyPress ||
 260            event_return->type == KeyRelease) &&
 261            event_return->xkey.state == ShiftMask &&
 262            (event_return->xkey.keycode == kp_add ||
 263            event_return->xkey.keycode == kp_subtract))
 264                 event_return->xkey.send_event = 0;
 265 }