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/*****************************************************************************
* Authors: Louis Bavoil <bavoil@cs.utah.edu>
* Peter Leese <peter@leese.net>
* Fredrik Hbinette <hubbe@hubbe.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
#define _GNU_SOURCE /* for getsid() */
#include "mozplugger.h"
static Display * display = 0;
static int pipe_fd;
static int flags;
static int repeats;
static char *winname;
static char *command;
static char *file;
static XWindowAttributes wattr;
static struct
{
int mapped;
int reparented;
Window window;
int borderWidth;
int x;
int y;
int width;
int height;
} victimDetails;
static struct
{
Window window;
int width;
int height;
} parentDetails;
static Atom swallowMutex;
static int swallowMutexTaken;
static Atom windowOwnerMark;
#define WINDOW (parentDetails.window)
static int error_handler(Display *dpy, XErrorEvent *err)
{
#ifdef DEBUG
char buffer[1024];
XGetErrorText(dpy, err->error_code, buffer, sizeof(buffer));
D("!!!ERROR_HANDLER!!!\n");
D("Error: %s\n", buffer);
#endif
return 0;
}
/*****************************************************************************
* Swallow mutex semaphore protection
*****************************************************************************/
static void initSwallowMutex(void)
{
D("Initialising Swallow Mutex\n");
if(!display)
{
fprintf(stderr, "Display not set so cannot initialise semaphore!\n");
return;
}
swallowMutex = XInternAtom(display, "MOZPLUGGER_SWALLOW_MUTEX", 0);
swallowMutexTaken = 0;
windowOwnerMark = XInternAtom(display, "MOZPLUGGER_OWNER", 0);
}
static uint32 getHostId(void)
{
char hostName[128];
uint32 id;
int i;
memset(hostName, 0, sizeof(hostName));
gethostname(hostName, sizeof(hostName)-1);
D("Host Name = \"%s\"\n", hostName);
/* OK, Create a 32 bit hash value from the host name....
use this as a host ID, the possiblity of a collison of hash keys
effecting the swallow of victims is so infinitimisally small! */
id = 0;
for(i=0; i < (int)(sizeof(hostName)/sizeof(uint32)); i++)
{
id = ((id << 5) ^ (id >> 27)) ^ ((uint32 *)hostName)[i];
}
return id;
}
static int getSwallowMutexOwner(uint32 * hostId, uint32 * pid)
{
unsigned long nitems;
unsigned long bytes;
int fmt;
Atom type;
unsigned char * property = NULL;
int success = 0;
/* Get hold of the Host & PID that current holds the semaphore for
this display! - watch out for the bizarre 64-bit platform behaviour
where property returned is actually an array of 2 x 64bit ints with
the top 32bits set to zero! */
XGetWindowProperty(display, wattr.root, swallowMutex,
0, 2, 0, XA_INTEGER,
&type, &fmt, &nitems, &bytes,
&property);
if(property)
{
/* Just check all is correct! */
if((type != XA_INTEGER) || (fmt!=32) || (nitems!=2))
{
fprintf(stderr, "XGetWindowProperty returned bad values "
"%ld,%d,%lu,%lu\n", (long) type, fmt, nitems,
bytes);
}
else
{
*hostId = (uint32)((unsigned long *)property)[0];
*pid = (uint32)((unsigned long *)property)[1];
success = 1;
}
XFree(property);
}
return success;
}
static void setSwallowMutexOwner(uint32 hostId, uint32 pid)
{
unsigned long temp[2] = {hostId, pid};
D("Setting swallow mutex owner, hostId = 0x%08X, pid=%d\n", hostId, pid);
XChangeProperty(display, wattr.root, swallowMutex,
XA_INTEGER, 32, PropModeAppend,
(unsigned char*) (&temp), 2);
}
static void takeSwallowMutex(void)
{
int countDown;
uint32 ourPid = (uint32)getpid();
uint32 ourHostId = getHostId();
uint32 otherPid;
uint32 otherHostId;
uint32 prevOtherPid = 0;
if((display == 0) || (swallowMutex == 0))
return;
D("Attempting to take Swallow Mutex\n");
/* Try up tp forty times ( 40 * 250ms = 10 seconds) to take
the semaphore... */
countDown = 40;
while(1)
{
/* While someone owns the semaphore */
while(getSwallowMutexOwner(&otherHostId, &otherPid))
{
if( otherHostId == ourHostId)
{
if(otherPid == ourPid)
{
/* Great we have either successfully taken the semaphore
OR (unlikely) we previously had the semaphore! Exit
the function...*/
swallowMutexTaken = 1;
D("Taken Swallow Mutex\n");
return;
}
D("Semaphore currently taken by pid=%ld\n", otherPid);
/* Check that the process that has the semaphore exists...
Bit of a hack, I cant find a function to directly check
if process exists. */
if( (getsid(otherPid) < 0 ) && (errno == ESRCH))
{
D("Strange other Pid(%lu) cannot be found\n", otherPid);
XDeleteProperty(display, wattr.root, swallowMutex);
break; /* OK force early exit of inner while loop */
}
}
/* Check if the owner of semaphore hasn't recently changed if it
has restart timer */
if(prevOtherPid != otherPid)
{
D("Looks like semaphore's owner has changed pid=%ld\n",
otherPid);
countDown = 40;
prevOtherPid = otherPid;
}
/* Do one step of the timer... */
countDown--;
if(countDown <= 0)
{
D("Waited long enough for Pid(%lu)\n", otherPid);
XDeleteProperty(display, wattr.root, swallowMutex);
break;
}
usleep(250000); /* 250ms */
}
/* else no one has semaphore, timeout, or owner is dead -
Set us as the owner, but we need to check if we weren't
beaten to it so once more around the loop */
setSwallowMutexOwner(ourHostId, ourPid);
}
}
static void giveSwallowMutex()
{
if((display == 0) || (swallowMutex == 0) || (swallowMutexTaken ==0))
return;
D("Giving Swallow Mutex\n");
XDeleteProperty(display, wattr.root, swallowMutex);
swallowMutexTaken = 0;
}
/*****************************************************************************
* Mark the victim window with a property that indicates that this instance
* of mozplugger-helper has made a claim to this victim. This is used to
* guard against two instances of mozplugger-helper claiming the same victim.
*****************************************************************************/
static int chkAndMarkVictimWindow(Window w)
{
unsigned long nitems;
unsigned long bytes;
int fmt;
Atom type;
unsigned char * property = NULL;
unsigned long temp[2];
uint32 ourPid;
uint32 ourHostId;
int gotIt = 0;
/* See if some other instance of Mozplugger has already 'marked' this
* window */
XGetWindowProperty(display, w, windowOwnerMark,
0, 2, 0, XA_INTEGER,
&type, &fmt, &nitems, &bytes,
&property);
if(property)
{
/* Just check all is correct! */
if((type != XA_INTEGER) || (fmt!=32) || (nitems!=2))
{
D("XGetWindowProperty(windowOwnerMark) returned bad values "
"%ld,%d,%lu,%lu\n", (long) type, fmt, nitems,
bytes);
}
XFree(property);
return 0; /* Looks like someone else has marked this window */
}
/* OK lets claim it for ourselves... */
ourPid = (uint32)getpid();
ourHostId = getHostId();
temp[0] = ourHostId;
temp[1] = ourPid;
XChangeProperty(display, w, windowOwnerMark,
XA_INTEGER, 32, PropModeAppend,
(unsigned char*) (&temp), 2);
/* See if we got it */
XGetWindowProperty(display, w, windowOwnerMark,
0, 2, 0, XA_INTEGER,
&type, &fmt, &nitems, &bytes,
&property);
if(property)
{
/* Just check all is correct! */
if((type != XA_INTEGER) || (fmt!=32) || (nitems!=2))
{
fprintf(stderr, "XGetWindowProperty returned bad values "
"%ld,%d,%lu,%lu\n", (long) type, fmt, nitems,
bytes);
}
else if( ( ((unsigned long *)property)[1] == ourPid)
&& ( ((unsigned long *)property)[0] == ourHostId) )
{
gotIt = 1;
}
XFree(property);
}
else
{
D("Strange, couldn't set windowOwnerMark\n");
gotIt = 1;
}
return gotIt;
}
/*****************************************************************************
* Window resizing
*****************************************************************************/
static int xaspect;
static int yaspect;
static int gcd(int a, int b)
{
if (a < b) return gcd(b,a);
if (b == 0) return a;
return gcd(b, a % b);
}
static int set_aspect(int x, int y)
{
int ox = xaspect;
int oy = yaspect;
int d = gcd(x, y);
xaspect = x / d;
yaspect = y / d;
D("xaspect=%d yaspect=%d\n", xaspect, yaspect);
return (ox != xaspect || oy != yaspect);
}
static void adjust_window_size(void)
{
int x = 0;
int y = 0;
int w = parentDetails.width;
int h = parentDetails.height;
int tmpw, tmph;
if (!victimDetails.window) return;
if (!victimDetails.mapped || !victimDetails.reparented)
{
D("Victim not ready to be resized\n");
return;
}
if (flags & H_FILL)
{
D("Resizing window %x with FILL\n", victimDetails.window);
}
else if (flags & H_MAXASPECT)
{
if (xaspect && yaspect)
{
D("Resizing window %x with MAXASPECT\n", victimDetails.window);
tmph = h / yaspect;
tmpw = w / xaspect;
if (tmpw < tmph) tmph = tmpw;
tmpw = tmph * xaspect;
tmph = tmph * yaspect;
x = (w - tmpw) / 2;
y = (h - tmph) / 2;
w = tmpw;
h = tmph;
}
else
{
D("Not resizing window\n");
return;
}
}
/* Compensate for the Victims border width (usually set to zero anyway) */
w -= 2 * victimDetails.borderWidth;
h -= 2 * victimDetails.borderWidth;
D("New size: %dx%d+%d+%d\n", w, h, x, y);
if((victimDetails.x == x) && (victimDetails.y == y)
&& (victimDetails.width == w) && (victimDetails.height == h))
{
XEvent event;
D("No change in window size so sending ConfigureNotify instead\n");
/* According to X11 ICCCM specification, a compliant window
* manager, (or proxy in this case) should sent a ConfigureNotify
* event to the client even if no size change has occurred!
* The code below is taken and adapted from the
* TWM window manager and fixed movdev bug #18298. */
event.type = ConfigureNotify;
event.xconfigure.display = display;
event.xconfigure.event = victimDetails.window;
event.xconfigure.window = victimDetails.window;
event.xconfigure.x = x;
event.xconfigure.y = y;
event.xconfigure.width = w;
event.xconfigure.height = h;
event.xconfigure.border_width = victimDetails.borderWidth;
event.xconfigure.above = Above;
event.xconfigure.override_redirect = False;
XSendEvent(display, victimDetails.window, False, StructureNotifyMask,
&event);
}
else
{
XMoveResizeWindow(display, victimDetails.window,
x, y, (unsigned)w, (unsigned)h);
victimDetails.x = x;
victimDetails.y = y;
victimDetails.width = w;
victimDetails.height = h;
}
}
/*****************************************************************************
* Window reparenting
*****************************************************************************/
static void change_leader(void)
{
XWMHints *leader_change;
if ((leader_change = XGetWMHints(display, victimDetails.window)))
{
leader_change->flags = (leader_change->flags | WindowGroupHint);
leader_change->window_group = wattr.root;
XSetWMHints(display,victimDetails.window,leader_change);
XFree(leader_change);
}
}
static int reparent_window(void)
{
if (!victimDetails.window) return 0;
if (!WINDOW) return 0;
XSelectInput(display, victimDetails.window, StructureNotifyMask);
XSync(display, False);
D("Changing leader of window %x\n", victimDetails.window);
change_leader();
D("Reparenting window %x into %x\n", victimDetails.window, WINDOW);
XReparentWindow(display, victimDetails.window, WINDOW, 0, 0);
D("reparent_window() done\n");
return 1;
}
static int is_viewable(Display *display, Window w)
{
XWindowAttributes a;
if (!XGetWindowAttributes(display, w, &a))
{
D("Could not get Window Attributes\n");
return 0;
}
if (a.map_state != IsViewable)
{
D("Invisible window\n");
return 0;
}
return 1;
}
/******************************************************************************
* Traditionally strcmp returns -1, 0 and +1 depending if name comes before
* or after windowname, this function also returns +1 if error
*****************************************************************************/
static int my_strcmp(char *windowname, char *name)
{
if (!name) return 1;
if (!windowname) return 1;
switch (name[0])
{
case '=':
return strcmp(name+1, windowname);
case '~':
return strcasecmp(name+1, windowname);
case '*':
return strncasecmp(name+1, windowname, strlen(name)-1);
default:
/* Return 0 for success so need to invert logic as strstr
returns pointer to the match or NULL if no match */
return !strstr(windowname, name);
}
}
static char check_window_name(Window w, char *name)
{
char *windowname;
XClassHint windowclass;
char match;
D("XFetchName\n");
if (XFetchName(display, w, &windowname))
{
D("Winrecur, checking window NAME %x (%s != %s)\n",
w, windowname, name);
match = (my_strcmp(windowname, name) == 0);
XFree(windowname);
if (match) {
return 1;
}
}
D("XGetClassHint\n");
if (XGetClassHint(display, w, &windowclass))
{
D("Winrecur, checking window CLASS %x (%s != %s)\n",
w, windowclass.res_name, name);
match = (my_strcmp(windowclass.res_name, name) == 0);
XFree(windowclass.res_class);
XFree(windowclass.res_name);
return match;
}
return 0;
}
#define MAX_IGNORED 3000
static unsigned int ignore_window_count = 0;
static Window ignored[MAX_IGNORED];
/*****************************************************************************
* init_winrecur
*
* This function should be called before forking the application. It runs
* through all windows on the screen to a depth of 'depth' and records their
* identify in the ignored list.
*****************************************************************************/
static void init_winrecur(Window from, int depth, char * name)
{
Window root, parent;
Window *children;
unsigned int e;
unsigned int num_children;
D("init_winrecur: storing family tree of window %x (depth=%d)\n",
from, depth);
if (check_window_name(from, name))
{
if (ignore_window_count < MAX_IGNORED)
{
ignored[ignore_window_count++] = from;
}
else
{
D("Woo too many windows!\n");
}
return;
}
if (depth > 0)
{
if (!XQueryTree(display, from, &root, &parent,
&children, &num_children))
{
D("init_winrecur: Querytree failed!!!\n");
return;
}
D("init_winrecur: Num children = %d\n", num_children);
for (e = 0; e < num_children; e++)
{
init_winrecur(children[e], depth-1, name);
}
XFree(children);
}
}
/*****************************************************************************
* find_winrecur
*
* This function should be called after forking the application and tries to
* see if this window (or its child) are the ones to swallow.
*****************************************************************************/
static Window find_winrecur(Window from, int depth, char *name)
{
Window root, parent;
Window *children;
unsigned int e;
unsigned int num_children;
D("find_winrecur, checking window %x (depth=%d)\n",from,depth);
for (e=0; e < ignore_window_count; e++)
{
if (ignored[e] == from)
{
/* This window is OLD, ignore it (and its children) */
return (Window)0;
}
}
/* This window doesn't match our 'HIDDEN' criteria, ignore it
* (and its children) */
if (!(flags & H_HIDDEN) && !is_viewable(display, from))
return (Window)0;
if (check_window_name(from, name))
{
/* See if some instance of mozplugger got the window before us, if
* not mark it as ours */
if(chkAndMarkVictimWindow(from))
{
return from;
}
}
if (depth > 0)
{
/* OK if we get here, lets check out the children just in case the
* application has decided to name a child not the parent?
* Question? Does this ever happen? */
if (!XQueryTree(display, from, &root, &parent,
&children, &num_children))
{
D("find_winrecur: Querytree failed!!!\n");
return (Window)0;
}
D("find_winrecur: Num children = %d\n", num_children);
for (e = 0; e < num_children; e++)
{
Window win = find_winrecur(children[e], depth-1, name);
if (win)
{
XFree(children);
return (Window)win;
}
}
XFree(children);
}
return (Window)0;
}
static void save_initial_windows(void)
{
ignore_window_count = 0;
init_winrecur(wattr.root, 3, winname);
}
static int setup_display(void)
{
char *displayname = getenv("DISPLAY");
D("setup_display(%s)\n", displayname);
XSetErrorHandler(error_handler);
if (!(display = XOpenDisplay(displayname)))
return 1;
if (!XGetWindowAttributes(display, WINDOW, &wattr))
return 1;
D("display=%x\n", display);
D("WINDOW=%x\n", WINDOW);
D("rootwin=%x\n", wattr.root);
D("setup_display() done\n");
return 0;
}
/*****************************************************************************
* Wrapper for execlp() that calls the application.
*
* WARNING: This function runs in the daughter process so one must assume the
* daughter uses a copy (including) heap memory of the parent's memory space
* i.e. any write to memory here does not affect the parent memory space.
* Since Linux uses copy-on-write, best leave memory read-only and once execlp
* is called, all daughter memory is wiped anyway (except the stack).
*****************************************************************************/
static void run_app(char **argv)
{
/* Close all File descriptors inherited from the parent,
* that's the XServer connection FD and pipe_fd */
if(display)
{
close(ConnectionNumber(display));
}
close(pipe_fd);
/* Redirect stdout & stderr to /dev/null */
if(flags & (H_NOISY | H_DAEMON))
{
const int ofd = open("/dev/null", O_RDONLY);
D("Redirecting stdout and stderr\n");
if(ofd == -1)
{
exit(EX_UNAVAILABLE);
}
dup2(ofd, 1);
dup2(ofd, 2);
close(ofd);
}
/* For a DAEMON we must also redirect STDIN to /dev/null
* otherwise we can get some weird behaviour especially with realplayer
* (I suspect it uses stdin to communicate with its peers) */
if(flags & H_DAEMON)
{
const int ifd = open("/dev/null", O_WRONLY);
D("Redirecting stdin also\n");
if(ifd == -1)
{
exit(EX_UNAVAILABLE);
}
dup2(ifd, 0);
close(ifd);
}
#if DEBUG
close_debug();
#endif
execvp(argv[0], argv);
D("Execvp failed. (errno=%d)\n", errno);
exit(EX_UNAVAILABLE);
}
/*****************************************************************************
* Looks for the window and reparents it when found.
*
*****************************************************************************/
static void find_victim(Window window)
{
if (!victimDetails.window)
{
D("Looking for victim... (%s)\n", winname);
victimDetails.window = find_winrecur(window, 2, winname);
if (victimDetails.window)
{
XWindowAttributes ca;
XGetWindowAttributes(display, victimDetails.window, &ca);
D("Found it!! Victim=%x\n", victimDetails.window);
victimDetails.borderWidth = ca.border_width;
victimDetails.x = ca.x;
victimDetails.y = ca.y;
victimDetails.width = ca.width;
victimDetails.height = ca.height;
/* We don't need to listen for new windows anymore */
XSelectInput(display, wattr.root, 0);
giveSwallowMutex();
if (flags & H_MAXASPECT)
{
set_aspect(ca.width, ca.height);
}
reparent_window();
}
}
}
static Bool AllXEventsPredicate(Display *dpy, XEvent *ev, char *arg)
{
return True;
}
static void check_x_events(void)
{
XEvent ev;
while (XCheckIfEvent(display, &ev, AllXEventsPredicate, NULL))
{
if (ev.xany.window == wattr.root)
{
switch (ev.type)
{
case CreateNotify:
D("***CreateNotify for root\n");
find_victim(ev.xcreatewindow.window);
break;
case MapNotify:
D("***MapNotify for root: %x\n", ev.xmap.window);
find_victim(ev.xmap.window);
break;
case ConfigureNotify:
D("***ConfigureNotify for root: %x\n", ev.xconfigure.window);
find_victim(ev.xconfigure.window);
break;
default:
/* 21 = ReparentNotify */
D("!!Got unhandled event for root->%d\n", ev.type);
break;
}
}
else if (victimDetails.window
&& ev.xany.window == victimDetails.window)
{
switch (ev.type)
{
case UnmapNotify:
D("UNMAPNOTIFY for victim\n");
victimDetails.mapped = 0;
break;
case MapNotify:
D("MAPNOTIFY for victim\n");
victimDetails.mapped = 1;
adjust_window_size();
break;
case ReparentNotify:
if (ev.xreparent.parent == WINDOW)
{
D("REPARENT NOTIFY on victim to the right window\n");
adjust_window_size();
victimDetails.reparented = 1;
} else {
D("REPARENT NOTIFY on victim to some other window!\n");
reparent_window();
victimDetails.reparented = 0;
}
break;
case ConfigureNotify:
D("CONFIGURE NOTIFY for victim\n");
D("- x=%d, y=%d, w=%d, h=%d, border_width=%d\n",
ev.xconfigure.x, ev.xconfigure.y,
ev.xconfigure.width, ev.xconfigure.height,
ev.xconfigure.border_width);
break;
case ClientMessage:
D("CLIENT MESSAGE for victim\n");
/* I see this with evince! perhaps it needs to be handled? */
break;
default:
/* 22 = ConfigureNotify, 33 = ClientMessage */
D("!!Got unhandled event for victim->%d\n", ev.type);
break;
}
}
else if (WINDOW && ev.xany.window == WINDOW)
{
unsigned long mask;
switch (ev.type)
{
case ConfigureRequest:
mask = ev.xconfigurerequest.value_mask;
D("ConfigureRequest to WINDOW mask=0x%x\n", mask);
if(ev.xconfigurerequest.window != victimDetails.window)
{
D("- Strange Configure Request not for victim\n");
break;
}
if(mask & (CWHeight | CWWidth))
{
D(" - request to set width & height\n");
set_aspect(ev.xconfigurerequest.width,
ev.xconfigurerequest.height);
adjust_window_size();
}
if(mask & (CWBorderWidth))
{
const int w = ev.xconfigurerequest.border_width;
D("- request to set border width=%d\n", w);
if(victimDetails.borderWidth != w)
{
victimDetails.borderWidth = w;
adjust_window_size();
}
XSetWindowBorderWidth(display, victimDetails.window,
(unsigned) w);
}
break;
default:
D("!!Got unhandled event for WINDOW->%d\n", ev.type);
break;
}
}
else
{
D("!!Got unhandled event for uknown->%d\n", ev.type);
}
}
/* For Window Maker */
if (victimDetails.reparented && !victimDetails.mapped)
{
D("XMapWindow\n");
XMapWindow(display, victimDetails.window);
}
}
static void check_pipe_fd_events(void)
{
static NPWindow wintmp;
int n;
Window oldwindow = WINDOW;
D("Got pipe_fd data, old parent=%x pipe_fd=%d\n", WINDOW, pipe_fd);
n = read(pipe_fd, ((char *)& wintmp), sizeof(wintmp));
if (n < 0)
{
if (errno == EINTR) return;
D("Winddata read error, exiting\n");
giveSwallowMutex();
exit(EX_UNAVAILABLE);
}
if (n == 0)
{
D("Winddata EOF, exiting\n");
giveSwallowMutex();
exit(EX_UNAVAILABLE);
}
if (n != sizeof(wintmp))
return;
parentDetails.window = (Window) wintmp.window;
parentDetails.width = (int) wintmp.width;
parentDetails.height = (int) wintmp.height;
D("Got pipe_fd data, new parent=%x\n", WINDOW);
if (WINDOW && WINDOW != oldwindow && display)
{
victimDetails.reparented = 0;
XSelectInput(display, oldwindow, 0);
XSelectInput(display, WINDOW, SubstructureRedirectMask);
XSync(display, False);
reparent_window();
}
/* The window has been resized. */
adjust_window_size();
}
static void check_all_events(void)
{
struct timeval tv;
int maxfd;
fd_set fds;
FD_ZERO(&fds);
FD_SET(ConnectionNumber(display), &fds);
FD_SET(pipe_fd, &fds);
maxfd = MAX(ConnectionNumber(display), pipe_fd);
tv.tv_sec = SELECT_TIMEOUT_SEC;
tv.tv_usec = SELECT_TIMEOUT_USEC;
#if 0
D("SELECT IN\n");
#endif
if (select(maxfd + 1, &fds, NULL, NULL, &tv) > 0)
{
D("SELECT OUT\n");
if (FD_ISSET(pipe_fd, &fds))
check_pipe_fd_events();
}
if (display)
{
check_x_events();
}
}
static void handle_app(pid_t pid)
{
int status;
if (flags & H_SWALLOW)
{
/* Whilst waiting for the Application to complete, check X events */
while (!waitpid(pid, &status, WNOHANG))
{
check_all_events();
}
/* Make sure the semaphore has been released */
giveSwallowMutex();
}
else if(flags & H_DAEMON)
{
/* If Daemon, then it is not supposed to exit, so we exit instead */
exit(0);
}
else
{
/* Just wait for the Application to complete dont check X events */
waitpid(pid, &status, 0);
}
/* If Application completed is a bad way, then lets give up now */
if (!WIFEXITED(status))
{
D("Process dumped core or something...\n");
exit(EX_UNAVAILABLE);
}
if (WEXITSTATUS(status) && !(flags & H_IGNORE_ERRORS))
{
D("Process exited with error code: %d\n", WEXITSTATUS(status));
exit(WEXITSTATUS(status));
}
D("Exited OK!\n");
}
/******************************************************************************
*
*****************************************************************************/
static void exitEarly(void)
{
fprintf(stderr,"MozPlugger version " VERSION " helper application.\n"
"Please see 'man mozplugger' for details.\n");
exit(1);
}
/******************************************************************************
* main() normally called from the child process started by mozplugger.so
*
*****************************************************************************/
int main(int argc, char **argv)
{
unsigned long temp = 0;
int x, y, i;
D("Helper started.....\n");
if (argc < 3)
{
exitEarly();
}
memset(&victimDetails, 0, sizeof(victimDetails));
memset(&parentDetails, 0, sizeof(parentDetails));
i = sscanf(argv[1],"%d,%d,%d,%lu,%d,%d,%d,%d",
&flags,
&repeats,
&pipe_fd,
&temp,
&x,
&y,
&parentDetails.width,
&parentDetails.height);
if(i < 8)
{
exitEarly();
}
parentDetails.window = (Window)temp;
command = argv[2];
winname = getenv("winname");
file = getenv("file");
D("HELPER: %s %s %s %s\n",
argv[0],
argv[1],
file,
command);
if (repeats < 1) repeats = 1;
while (repeats > 0)
{
char *app_argv[10];
int loops = 1;
pid_t pid;
/* This application will use the $repeat variable */
if (flags & H_REPEATCOUNT)
loops = repeats;
/* Expecting the application to loop */
if (flags & H_LOOP)
loops = MAXINT;
/* Create command line */
app_argv[0] = "/bin/sh";
app_argv[1] = "-c";
app_argv[2] = command;
app_argv[3] = NULL;
if (setup_display())
{
D("setup_display() failed\n");
flags &=~ H_SWALLOW;
}
if (flags & H_SWALLOW)
{
/* If we are swallowing a victim window we need to guard
against more than one instance of helper running in
parallel, this is done using a global mutex semaphore. */
initSwallowMutex();
/* Belt & braces, make sure we give semaphore on error. */
signal(SIGTERM, giveSwallowMutex);
takeSwallowMutex();
/* Has to be done before forking */
save_initial_windows();
XSelectInput(display, WINDOW, SubstructureRedirectMask);
XSelectInput(display, wattr.root, SubstructureNotifyMask);
XSync(display, False);
}
if ((pid = fork()) == -1)
{
giveSwallowMutex();
exit(EX_UNAVAILABLE);
}
if (pid == 0)
{
/* Child process */
#if 0 /* Peter Leese - I'm sure this is not needed, especially if FD is closed
in run_app() */
XSelectInput(display, WINDOW, 0);
XSelectInput(display, wattr.root, 0);
#endif
D("Running %s\n", command);
run_app(app_argv);
}
else
{
D("Waiting for pid=%d\n", pid);
handle_app(pid);
D("Wait done (repeats=%d, loops=%d)\n", repeats, loops);
if (repeats < MAXINT)
repeats -= loops;
}
/* On each repeat we re-open the XServer connection, so need to
* close it at end of loop - TODO perhaps we should keep in open
* for all repeats? */
XCloseDisplay(display);
}
exit(0);
}
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