/* *  Copyright (C) 1997, 1998 Olivetti & Oracle Research Laboratory * *  This 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 software 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 software; if not, write to the Free Software *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, *  USA. *//* * listen.c - listen for incoming connections */#include <unistd.h>#include <sys/types.h>#include <sys/wait.h>#include <sys/time.h>#include <vncviewer.h>#define FLASHWIDTH 50	/* pixels */#define FLASHDELAY 1	/* seconds */static Font flashFont;static void getFlashFont(Display *d);static void flashDisplay(Display *d, char *user);voidlistenForIncomingConnections(){    Display *d;    XEvent ev;    int listenSocket, flashSocket, sock;    fd_set fds;    char flashUser[256];    int n;    if (!(d = XOpenDisplay(displayname))) {	fprintf(stderr,"%s: unable to open display %s\n",		programName, XDisplayName(displayname));	exit(1);    }    getFlashFont(d);    listenSocket = ListenAtTcpPort(listenPort);    flashSocket = ListenAtTcpPort(flashPort);    if ((listenSocket < 0) || (flashSocket < 0)) exit(1);    fprintf(stderr,"%s: Listening on port %d (flash port %d)\n",	    programName,listenPort,flashPort);    while (True) {	/* reap any zombies */	int status, pid;	while ((pid= wait3(&status, WNOHANG, (struct rusage *)0))>0);	/* discard any X events */	while (XCheckIfEvent(d, &ev, AllXEventsPredicate, NULL))	    ;	FD_ZERO(&fds); 	FD_SET(flashSocket, &fds);	FD_SET(listenSocket, &fds);	FD_SET(ConnectionNumber(d), &fds);	select(FD_SETSIZE, &fds, NULL, NULL, NULL);	if (FD_ISSET(flashSocket, &fds)) {	    sock = AcceptTcpConnection(flashSocket);	    if (sock < 0) exit(1);	    n = read(sock, flashUser, 255);	    if (n > 0) {		flashUser[n] = 0;		flashDisplay(d, flashUser);	    } else {		flashDisplay(d, NULL);	    }	    close(sock);	}	if (FD_ISSET(listenSocket, &fds)) {	    rfbsock = AcceptTcpConnection(listenSocket);	    if (rfbsock < 0) exit(1);	    XCloseDisplay(d);	    /* Now fork off a new process to deal with it... */	    switch (fork()) {	    case -1: 		perror("fork"); 		exit(1);	    case 0:		/* child - return to caller */		close(listenSocket);		close(flashSocket);		return;	    default:		/* parent - go round and listen again */		close(rfbsock); 		if (!(d = XOpenDisplay(displayname))) {		    fprintf(stderr,"%s: unable to open display \"%s\"\r\n",			    programName, XDisplayName (displayname));		    exit(1);		}		getFlashFont(d);		break;	    }	}    }}/* * getFlashFont */static voidgetFlashFont(Display *d){    char fontName[256];    char **fontNames;    int nFontNames;    sprintf(fontName,"-*-courier-bold-r-*-*-%d-*-*-*-*-*-iso8859-1",	    FLASHWIDTH);    fontNames = XListFonts(d, fontName, 1, &nFontNames);    if (nFontNames == 1) {	XFreeFontNames(fontNames);    } else {	sprintf(fontName,"fixed");    }    flashFont = XLoadFont(d, fontName);}/* * flashDisplay */static voidflashDisplay(Display *d, char *user){    Window w1, w2, w3, w4;    XSetWindowAttributes attr;    XBell(d, 100);    XForceScreenSaver(d, ScreenSaverReset);    attr.background_pixel = BlackPixel(d, DefaultScreen(d));    attr.override_redirect = 1;    attr.save_under = True;    w1 = XCreateWindow(d, DefaultRootWindow(d), 0, 0,		       WidthOfScreen(DefaultScreenOfDisplay(d)), 		       FLASHWIDTH, 0, 		       CopyFromParent, CopyFromParent, CopyFromParent, 		       CWBackPixel|CWOverrideRedirect|CWSaveUnder,		       &attr);      w2 = XCreateWindow(d, DefaultRootWindow(d), 0, 0, FLASHWIDTH,		       HeightOfScreen(DefaultScreenOfDisplay(d)), 0,		       CopyFromParent, CopyFromParent, CopyFromParent, 		       CWBackPixel|CWOverrideRedirect|CWSaveUnder,		       &attr);    w3 = XCreateWindow(d, DefaultRootWindow(d), 		       WidthOfScreen(DefaultScreenOfDisplay(d))-FLASHWIDTH, 		       0, FLASHWIDTH, 		       HeightOfScreen(DefaultScreenOfDisplay(d)), 0, 		       CopyFromParent, CopyFromParent, CopyFromParent, 		       CWBackPixel|CWOverrideRedirect|CWSaveUnder,		       &attr);    w4 = XCreateWindow(d, DefaultRootWindow(d), 0,		       HeightOfScreen(DefaultScreenOfDisplay(d))-FLASHWIDTH, 		       WidthOfScreen(DefaultScreenOfDisplay(d)), 		       FLASHWIDTH, 0, 		       CopyFromParent, CopyFromParent, CopyFromParent, 		       CWBackPixel|CWOverrideRedirect|CWSaveUnder,		       &attr);    XMapWindow(d, w1);    XMapWindow(d, w2);    XMapWindow(d, w3);    XMapWindow(d, w4);    if (user) {	GC gc;	XGCValues gcv;	gcv.foreground = WhitePixel(d, DefaultScreen(d));	gcv.font = flashFont;	gc = XCreateGC(d, w1, GCForeground|GCFont, &gcv);	XDrawString(d, w1, gc,		    WidthOfScreen(DefaultScreenOfDisplay(d)) / 2 - FLASHWIDTH,		    (FLASHWIDTH * 3 / 4), user, strlen(user));    }    XFlush(d);    sleep(FLASHDELAY);    XDestroyWindow(d, w1);    XDestroyWindow(d, w2);    XDestroyWindow(d, w3);    XDestroyWindow(d, w4);    XFlush(d);}