libtdevnc/x11vnc/x11vnc.c

/*
 * x11vnc: a VNC server for X displays.
 *
 * Copyright (c) 2002-2006 Karl J. Runge <runge@karlrunge.com>
 * All rights reserved.
 *
 *  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; version 2 of the License.
 *
 *  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.
 *
 *
 * This program is based on the following programs:
 *
 *       the originial x11vnc.c in libvncserver (Johannes E. Schindelin)
 *	 x0rfbserver, the original native X vnc server (Jens Wagner)
 *       krfb, the KDE desktopsharing project (Tim Jansen)
 *
 * The primary goal of this program is to create a portable and simple
 * command-line server utility that allows a VNC viewer to connect
 * to an actual X display (as the above do).  The only non-standard
 * dependency of this program is the static library libvncserver.a.
 * Although in some environments libjpeg.so or libz.so may not be
 * readily available and needs to be installed, they may be found
 * at ftp://ftp.uu.net/graphics/jpeg/ and http://www.gzip.org/zlib/,
 * respectively.  To increase portability it is written in plain C.
 *
 * Another goal is to improve performance and interactive response.
 * The algorithm of x0rfbserver was used as a base.  Many additional
 * heuristics are also applied.
 *
 * Another goal is to add many features that enable and incourage creative
 * usage and application of the tool.  Apologies for the large number
 * of options!
 *
 * To build:
 *
 * Obtain the libvncserver package (http://libvncserver.sourceforge.net).
 * As of 12/2002 this version of x11vnc.c is contained in the libvncserver
 * CVS tree and released in version 0.5.
 *
 * gcc should be used on all platforms.  To build a threaded version put
 * "-D_REENTRANT -DX11VNC_THREADED" in the environment variable CFLAGS
 * or CPPFLAGS (e.g. before running the libvncserver configure).  The
 * threaded mode is a bit more responsive, but can be unstable (e.g.
 * if more than one client the same tight or zrle encoding).
 *
 * Known shortcomings:
 *
 * The screen updates are good, but of course not perfect since the X
 * display must be continuously polled and read for changes and this is
 * slow for most hardware. This can be contrasted with receiving a change
 * callback from the X server, if that were generally possible... (UPDATE:
 * this is handled now with the X DAMAGE extension, but unfortunately
 * that doesn't seem to address the slow read from the video h/w).  So,
 * e.g., opaque moves and similar window activity can be very painful;
 * one has to modify one's behavior a bit.
 *
 * General audio at the remote display is lost unless one separately
 * sets up some audio side-channel such as esd.
 *
 * It does not appear possible to query the X server for the current
 * cursor shape.  We can use XTest to compare cursor to current window's
 * cursor, but we cannot extract what the cursor is... (UPDATE: we now
 * use XFIXES extension for this.  Also on Solaris and IRIX Overlay
 * extensions exists that allow drawing the mouse into the framebuffer)
 * 
 * The current *position* of the remote X mouse pointer is shown with
 * the -cursor option.  Further, if -cursorX or -X is used, a trick
 * is done to at least show the root window cursor vs non-root cursor.
 * (perhaps some heuristic can be done to further distinguish cases...,
 * currently "-cursor some" is a first hack at this)
 *
 * Under XFIXES mode for showing the cursor shape, the cursor may be
 * poorly approximated if it has transparency (alpha channel).
 *
 * Windows using visuals other than the default X visual may have
 * their colors messed up.  When using 8bpp indexed color, the colormap
 * is attempted to be followed, but may become out of date.  Use the
 * -flashcmap option to have colormap flashing as the pointer moves
 * windows with private colormaps (slow).  Displays with mixed depth 8 and
 * 24 visuals will incorrectly display windows using the non-default one.
 * On Sun and Sgi hardware we can to work around this with -overlay.
 *
 * Feature -id <windowid> can be picky: it can crash for things like
 * the window not sufficiently mapped into server memory, etc (UPDATE:
 * we now use the -xrandr mechanisms to trap errors more robustly for
 * this mode).  SaveUnders menus, popups, etc will not be seen.
 *
 * Under some situations the keysym unmapping is not correct, especially
 * if the two keyboards correspond to different languages.  The -modtweak
 * option is the default and corrects most problems. One can use the
 * -xkb option to try to use the XKEYBOARD extension to clear up any
 * remaining problems.
 *
 * Occasionally, a few tile updates can be missed leaving a patch of
 * color that needs to be refreshed.  This may only be when threaded,
 * which is no longer the default.
 *
 * There seems to be a serious bug with simultaneous clients when
 * threaded, currently the only workaround in this case is -nothreads
 * (which is now the default).
 *
 */


/* -- x11vnc.c -- */

#include "x11vnc.h"
#include "xwrappers.h"
#include "xdamage.h"
#include "xrecord.h"
#include "xevents.h"
#include "xinerama.h"
#include "xrandr.h"
#include "xkb_bell.h"
#include "win_utils.h"
#include "remote.h"
#include "scan.h"
#include "gui.h"
#include "help.h"
#include "user.h"
#include "cleanup.h"
#include "keyboard.h"
#include "pointer.h"
#include "cursor.h"
#include "userinput.h"
#include "screen.h"
#include "connections.h"
#include "rates.h"
#include "unixpw.h"
#include "inet.h"
#include "sslcmds.h"
#include "sslhelper.h"
#include "selection.h"
#include "pm.h"
#include "solid.h"

/*
 * main routine for the x11vnc program
 */

static void check_cursor_changes(void);
static void record_last_fb_update(void);
static int choose_delay(double dt);
static void watch_loop(void);
static int limit_shm(void);
static void check_rcfile(int argc, char **argv);
static void immediate_switch_user(int argc, char* argv[]);
static void print_settings(int try_http, int bg, char *gui_str);
static void check_loop_mode(int argc, char* argv[]);


static void check_cursor_changes(void) {
	static double last_push = 0.0;

	if (unixpw_in_progress) return;

	cursor_changes += check_x11_pointer();

	if (cursor_changes) {
		double tm, max_push = 0.125, multi_push = 0.01, wait = 0.02;
		int cursor_shape, dopush = 0, link, latency, netrate;

		if (! all_clients_initialized()) {
			/* play it safe */
			return;
		}

		if (0) cursor_shape = cursor_shape_updates_clients(screen);
	
		dtime0(&tm);
		link = link_rate(&latency, &netrate);
		if (link == LR_DIALUP) {
			max_push = 0.2;
			wait = 0.05;
		} else if (link == LR_BROADBAND) {
			max_push = 0.075;
			wait = 0.05;
		} else if (link == LR_LAN) {
			max_push = 0.01;
		} else if (latency < 5 && netrate > 200) {
			max_push = 0.01;
		}
		
		if (tm > last_push + max_push) {
			dopush = 1;
		} else if (cursor_changes > 1 && tm > last_push + multi_push) {
			dopush = 1;
		}

		if (dopush) { 
			mark_rect_as_modified(0, 0, 1, 1, 1);
			fb_push_wait(wait, FB_MOD);
			last_push = tm;
		} else {
			rfbPE(0);
		}
	}
	cursor_changes = 0;
}

static void record_last_fb_update(void) {
	static int rbs0 = -1;
	static time_t last_call = 0;
	time_t now = time(NULL);
	int rbs = -1;
	rfbClientIteratorPtr iter;
	rfbClientPtr cl;

	if (last_fb_bytes_sent == 0) {
		last_fb_bytes_sent = now;
		last_call = now;
	}

	if (now <= last_call + 1) {
		/* check every second or so */
		return;
	}

	if (unixpw_in_progress) return;

	last_call = now;

	if (! screen) {
		return;
	}

	iter = rfbGetClientIterator(screen);
	while( (cl = rfbClientIteratorNext(iter)) ) {
#if 0
		rbs += cl->rawBytesEquivalent;
#else
		rbs += rfbStatGetSentBytesIfRaw(cl);
#endif
	}
	rfbReleaseClientIterator(iter);

	if (rbs != rbs0) {
		rbs0 = rbs;
		if (debug_tiles > 1) {
			printf("record_last_fb_update: %d %d\n",
			    (int) now, (int) last_fb_bytes_sent);
		}
		last_fb_bytes_sent = now;
	}
}

static int choose_delay(double dt) {
	static double t0 = 0.0, t1 = 0.0, t2 = 0.0, now; 
	static int x0, y0, x1, y1, x2, y2, first = 1;
	int dx0, dy0, dx1, dy1, dm, i, msec = waitms;
	double cut1 = 0.15, cut2 = 0.075, cut3 = 0.25;
	double bogdown_time = 0.25, bave = 0.0;
	int bogdown = 1, bcnt = 0;
	int ndt = 8, nave = 3;
	double fac = 1.0;
	int db = 0;
	static double dts[8];

	if (waitms == 0) {
		return waitms;
	}
	if (nofb) {
		return waitms;
	}

	if (first) {
		for(i=0; i<ndt; i++) {
			dts[i] = 0.0;
		}
		first = 0;
	}

	now = dnow();

	/*
	 * first check for bogdown, e.g. lots of activity, scrolling text
	 * from command output, etc.
	 */
	if (nap_ok) {
		dt = 0.0;
	}
	if (! wait_bog) {
		bogdown = 0;

	} else if (button_mask || now < last_keyboard_time + 2*bogdown_time) {
		/*
		 * let scrolls & keyboard input through the normal way
		 * otherwise, it will likely just annoy them.
		 */
		bogdown = 0;

	} else if (dt > 0.0) {
		/*
		 * inspect recent dt's:
		 * 0 1 2 3 4 5 6 7 dt
		 *             ^ ^ ^
		 */
		for (i = ndt - (nave - 1); i < ndt; i++) {
			bave += dts[i];
			bcnt++;
			if (dts[i] < bogdown_time) {
				bogdown = 0;
				break;
			}
		}
		bave += dt;
		bcnt++;
		bave = bave / bcnt;
		if (dt < bogdown_time) {
			bogdown = 0;
		}
	} else {
		bogdown = 0;
	}
	/* shift for next time */
	for (i = 0; i < ndt-1; i++) {
		dts[i] = dts[i+1];
	}
	dts[ndt-1] = dt;

if (0 && dt > 0.0) fprintf(stderr, "dt: %.5f %.4f\n", dt, dnowx());
	if (bogdown) {
		if (use_xdamage) {
			/* DAMAGE can queue ~1000 rectangles for a scroll */
			clear_xdamage_mark_region(NULL, 0);
		}
		msec = (int) (1000 * 1.75 * bave);
		if (dts[ndt - nave - 1] > 0.75 * bave) {
			msec = 1.5 * msec;
			set_xdamage_mark(0, 0, dpy_x, dpy_y);
		}
		if (msec > 1500) {
			msec = 1500;
		}
		if (msec < waitms) {
			msec = waitms;
		}
		db = (db || debug_tiles);
		if (db) fprintf(stderr, "bogg[%d] %.3f %.3f %.3f %.3f\n",
		    msec, dts[ndt-4], dts[ndt-3], dts[ndt-2], dts[ndt-1]);
		return msec;
	}

	/* next check for pointer motion, keystrokes, to speed up */
	t2 = dnow();
	x2 = cursor_x;
	y2 = cursor_y;

	dx0 = nabs(x1 - x0);
	dy0 = nabs(y1 - y0);
	dx1 = nabs(x2 - x1);
	dy1 = nabs(y2 - y1);
	if (dx1 > dy1) {
		dm = dx1;
	} else {
		dm = dy1;
	}

	if ((dx0 || dy0) && (dx1 || dy1)) {
		if (t2 < t0 + cut1 || t2 < t1 + cut2 || dm > 20) {
			fac = wait_ui * 1.25;
		}
	} else if ((dx1 || dy1) && dm > 40) {
		fac = wait_ui;
	}

	if (fac == 1 && t2 < last_keyboard_time + cut3) {
		fac = wait_ui;
	}
	msec = (int) ((double) waitms / fac);
	if (msec == 0) {
		msec = 1;
	}

	x0 = x1;
	y0 = y1;
	t0 = t1;

	x1 = x2;
	y1 = y2;
	t1 = t2;

	return msec;
}

void check_filexfer(void) {
	static time_t last_check = 0;
	rfbClientIteratorPtr iter;
	rfbClientPtr cl;
	int transferring = 0; 
	
	if (time(NULL) <= last_check) {
		return;
	}

#if 0
	if (getenv("NOFT")) {
		return;
	}
#endif

	iter = rfbGetClientIterator(screen);
	while( (cl = rfbClientIteratorNext(iter)) ) {
		if (cl->fileTransfer.receiving) {
			transferring = 1;
			break;
		}
		if (cl->fileTransfer.sending) {
			transferring = 1;
			break;
		}
	}
	rfbReleaseClientIterator(iter);

	if (transferring) {
		double start = dnow();
		while (dnow() < start + 0.5) {
			rfbCFD(5000);
			rfbCFD(1000);
			rfbCFD(0);
		}
	} else {
		last_check = time(NULL);
	}
}

/*
 * main x11vnc loop: polls, checks for events, iterate libvncserver, etc.
 */
static void watch_loop(void) {
	int cnt = 0, tile_diffs = 0, skip_pe = 0;
	double tm, dtr, dt = 0.0;
	time_t start = time(NULL);

	if (use_threads) {
		rfbRunEventLoop(screen, -1, TRUE);
	}

	while (1) {
		char msg[] = "new client: %s taking unixpw client off hold.\n";

		got_user_input = 0;
		got_pointer_input = 0;
		got_local_pointer_input = 0;
		got_pointer_calls = 0;
		got_keyboard_input = 0;
		got_keyboard_calls = 0;
		urgent_update = 0;

		if (! use_threads) {
			dtime0(&tm);
			if (! skip_pe) {
				if (unixpw_in_progress) {
					rfbClientPtr cl = unixpw_client;
					if (cl && cl->onHold) {
						rfbLog(msg, cl->host);
						unixpw_client->onHold = FALSE;
					}
				} else {
					measure_send_rates(1);
				}

				unixpw_in_rfbPE = 1;

				/*
				 * do a few more since a key press may
				 * have induced a small change we want to
				 * see quickly (just 1 rfbPE will likely
				 * only process the subsequent "up" event)
				 */
				if (tm < last_keyboard_time + 0.16) {
					rfbPE(0);
					rfbPE(0);
					rfbPE(-1);
					rfbPE(0);
					rfbPE(0);
				} else {
					rfbPE(-1);
				}

				unixpw_in_rfbPE = 0;

				if (unixpw_in_progress) {
					/* rfbPE loop until logged in. */
					skip_pe = 0;
					check_new_clients();
					continue;
				} else {
					measure_send_rates(0);
					fb_update_sent(NULL);
				}
			} else {
				if (unixpw_in_progress) {
					skip_pe = 0;
					check_new_clients();
					continue;
				}
			}
			dtr = dtime(&tm);

			if (! cursor_shape_updates) {
				/* undo any cursor shape requests */
				disable_cursor_shape_updates(screen);
			}
			if (screen && screen->clientHead) {
				int ret = check_user_input(dt, dtr,
				    tile_diffs, &cnt);
				/* true: loop back for more input */
				if (ret == 2) {
					skip_pe = 1;
				}
				if (ret) {
					if (debug_scroll) fprintf(stderr, "watch_loop: LOOP-BACK: %d\n", ret);
					continue;
				}
			}
			/* watch for viewonly input piling up: */
			if ((got_pointer_calls > got_pointer_input) ||
			    (got_keyboard_calls > got_keyboard_input)) {
				eat_viewonly_input(10, 3);
			}
		} else {
			/* -threads here. */
			if (wireframe && button_mask) {
				check_wireframe();
			}
		}
		skip_pe = 0;

		if (shut_down) {
			clean_up_exit(0);
		}

		if (unixpw_in_progress) {
			check_new_clients();
			continue;
		}

		if (! urgent_update) {
			if (do_copy_screen) {
				do_copy_screen = 0;
				copy_screen();
			}

			check_new_clients();
			check_ncache(0, 0);
			check_xevents(0);
			check_autorepeat();
			check_pm();
			check_filexfer();
			check_keycode_state();
			check_connect_inputs();
			check_gui_inputs();
			check_stunnel();
			check_openssl();
			check_https();
			record_last_fb_update();
			check_padded_fb();
			check_fixscreen();
			check_xdamage_state();
			check_xrecord_reset(0);
			check_add_keysyms();
			check_new_passwds(0);
			if (started_as_root) {
				check_switched_user();
			}

			if (first_conn_timeout < 0) {
				start = time(NULL);
				first_conn_timeout = -first_conn_timeout;
			}
		}

		if (! screen || ! screen->clientHead) {
			/* waiting for a client */
			if (first_conn_timeout) {
				if (time(NULL) - start > first_conn_timeout) {
					rfbLog("No client after %d secs.\n",
					    first_conn_timeout);
					shut_down = 1;
				}
			}
			usleep(200 * 1000);
			continue;
		}

		if (first_conn_timeout && all_clients_initialized()) {
			first_conn_timeout = 0;
		}

		if (nofb) {
			/* no framebuffer polling needed */
			if (cursor_pos_updates) {
				check_x11_pointer();
			}
#ifdef MACOSX
			else check_x11_pointer();
#endif
			continue;
		}

		if (button_mask && (!show_dragging || pointer_mode == 0)) {
			/*
			 * if any button is pressed in this mode do
			 * not update rfb screen, but do flush the
			 * X11 display.
			 */
			X_LOCK;
			XFlush_wr(dpy);
			X_UNLOCK;
			dt = 0.0;
		} else {
			static double last_dt = 0.0;
			double xdamage_thrash = 0.4; 

			check_cursor_changes();

			/* for timing the scan to try to detect thrashing */

			if (use_xdamage && last_dt > xdamage_thrash)  {
				clear_xdamage_mark_region(NULL, 0);
			}

			if (unixpw_in_progress) continue;
			dtime0(&tm);
			if (use_snapfb) {
				int t, tries = 3;
				copy_snap();
				for (t =0; t < tries; t++) {
					tile_diffs = scan_for_updates(0);
				}
			} else {
				tile_diffs = scan_for_updates(0);
			}
			dt = dtime(&tm);
			if (! nap_ok) {
				last_dt = dt;
			}

 if ((debug_tiles || debug_scroll > 1 || debug_wireframe > 1)
    && (tile_diffs > 4 || debug_tiles > 1)) {
	double rate = (tile_x * tile_y * bpp/8 * tile_diffs) / dt;
	fprintf(stderr, "============================= TILES: %d  dt: %.4f"
	    "  t: %.4f  %.2f MB/s nap_ok: %d\n", tile_diffs, dt,
	    tm - x11vnc_start, rate/1000000.0, nap_ok);
 }

		}

		/* sleep a bit to lessen load */
		if (! urgent_update) {
			int wait = choose_delay(dt);
			if (wait > 2*waitms) {
				/* bog case, break it up */
				nap_sleep(wait, 10);
			} else {
				usleep(wait * 1000);
			}
		}
		cnt++;
	}
}

/* 
 * check blacklist for OSs with tight shm limits.
 */
static int limit_shm(void) {
	int limit = 0;

	if (UT.sysname == NULL) {
		return 0;
	}
	if (!strcmp(UT.sysname, "SunOS")) {
		char *r = UT.release;
		if (*r == '5' && *(r+1) == '.') {
			if (strchr("2345678", *(r+2)) != NULL) {
				limit = 1;
			}
		}
	} else if (!strcmp(UT.sysname, "Darwin")) {
		limit = 1;
	}
	if (limit && ! quiet) {
		fprintf(stderr, "reducing shm usage on %s %s (adding "
		    "-onetile)\n", UT.sysname, UT.release);
	}
	return limit;
}


/*
 * quick-n-dirty ~/.x11vncrc: each line (except # comments) is a cmdline option.
 */
static int argc2 = 0;
static char **argv2;

static void check_rcfile(int argc, char **argv) {
	int i, j, pwlast, norc = 0, argmax = 1024;
	char *infile = NULL;
	char rcfile[1024];
	FILE *rc = NULL; 

	for (i=1; i < argc; i++) {
		if (!strcmp(argv[i], "-printgui")) {
			fprintf(stdout, "%s", get_gui_code());
			fflush(stdout);
			exit(0);
		}
		if (!strcmp(argv[i], "-norc")) {
			norc = 1;
			got_norc = 1;
		}
		if (!strcmp(argv[i], "-QD")) {
			norc = 1;
		}
		if (!strcmp(argv[i], "-rc")) {
			if (i+1 >= argc) {
				fprintf(stderr, "-rc option requires a "
				    "filename\n");
				exit(1);
			} else {
				infile = argv[i+1];
			}
		}
	}
	rc_norc = norc;
	rc_rcfile = strdup("");
	if (norc) {
		;
	} else if (infile != NULL) {
		rc = fopen(infile, "r");
		rc_rcfile = strdup(infile);
		if (rc == NULL) {
			fprintf(stderr, "could not open rcfile: %s\n", infile);
			perror("fopen");
			exit(1);
		}
	} else {
		char *home = get_home_dir();
		if (! home) {
			norc = 1;
		} else {
			strncpy(rcfile, home, 500);
			free(home);

			strcat(rcfile, "/.x11vncrc");
			infile = rcfile;
			rc = fopen(rcfile, "r");
			if (rc == NULL) {
				norc = 1;
			} else {
				rc_rcfile = strdup(rcfile);
				rc_rcfile_default = 1;
			}
		}
	}

	argv2 = (char **) malloc(argmax * sizeof(char *));
	argv2[argc2++] = strdup(argv[0]);

	if (! norc) {
		char line[4096], parm[100], tmp[101];
		char *buf, *tbuf;
		struct stat sbuf;
		int sz;

		if (fstat(fileno(rc), &sbuf) != 0) {
			fprintf(stderr, "problem with %s\n", infile);
			perror("fstat");
			exit(1);
		}
		sz = sbuf.st_size+1;	/* allocate whole file size */
		if (sz < 1024) {
			sz = 1024;
		}

		buf = (char *) malloc(sz);
		buf[0] = '\0';

		while (fgets(line, 4096, rc) != NULL) {
			char *q, *p = line;
			char c;
			int cont = 0;

			q = p;
			c = '\0';
			while (*q) {
				if (*q == '#') {
					if (c != '\\') {
						*q = '\0';
						break;
					}
				}
				c = *q;
				q++;
			}

			q = p;
			c = '\0';
			while (*q) {
				if (*q == '\n') {
					if (c == '\\') {
						cont = 1;
						*q = '\0';
						*(q-1) = ' ';
						break;
					}
					while (isspace((unsigned char) (*q))) {
						*q = '\0';
						if (q == p) {
							break;
						}
						q--;
					}
					break;
				}
				c = *q;
				q++;
			}
			if (q != p && !cont) {
				if (*q == '\0') {
					q--;
				}
				while (isspace((unsigned char) (*q))) {
					*q = '\0';
					if (q == p) {
						break;
					}
					q--;
				}
			}

			p = lblanks(p);

			strncat(buf, p, sz - strlen(buf) - 1);
			if (cont) {
				continue;
			}
			if (buf[0] == '\0') {
				continue;
			}

			i = 0;
			q = buf;
			while (*q) {
				i++;
				if (*q == '\n' || isspace((unsigned char) (*q))) {
					break;
				}
				q++;
			}

			if (i >= 100) {
				fprintf(stderr, "invalid rcfile line: %s/%s\n",
				    p, buf);
				exit(1);
			}

			if (sscanf(buf, "%s", parm) != 1) {
				fprintf(stderr, "invalid rcfile line: %s\n", p);
				exit(1);
			}
			if (parm[0] == '-') {
				strncpy(tmp, parm, 100); 
			} else {
				tmp[0] = '-';
				strncpy(tmp+1, parm, 100); 
			}

			argv2[argc2++] = strdup(tmp);
			if (argc2 >= argmax) {
				fprintf(stderr, "too many rcfile options\n");
				exit(1);
			}
			
			p = buf;
			p += strlen(parm);
			p = lblanks(p);

			if (*p == '\0') {
				buf[0] = '\0';
				continue;
			}

			tbuf = (char *) calloc(strlen(p) + 1, 1);

			j = 0;
			while (*p) {
				if (*p == '\\' && *(p+1) == '#') {
					;
				} else {
					tbuf[j++] = *p;
				}
				p++;
			}

			argv2[argc2++] = strdup(tbuf);
			free(tbuf);
			if (argc2 >= argmax) {
				fprintf(stderr, "too many rcfile options\n");
				exit(1);
			}
			buf[0] = '\0';
		}
		fclose(rc);
		free(buf);
	}
	pwlast = 0;
	for (i=1; i < argc; i++) {
		argv2[argc2++] = strdup(argv[i]);

		if (pwlast || !strcmp("-passwd", argv[i])
		    || !strcmp("-viewpasswd", argv[i])) {
			char *p = argv[i];		
			if (pwlast) {
				pwlast = 0;
			} else {
				pwlast = 1;
			}
			strzero(p);
		}
		if (argc2 >= argmax) {
			fprintf(stderr, "too many rcfile options\n");
			exit(1);
		}
	}
}

static void immediate_switch_user(int argc, char* argv[]) {
	int i;
	for (i=1; i < argc; i++) {
		char *u;

		if (strcmp(argv[i], "-users")) {
			continue;
		}
		if (i == argc - 1) {
			fprintf(stderr, "not enough arguments for: -users\n");
			exit(1);
		}
		if (*(argv[i+1]) != '=') {
			break;
		}

		/* wants an immediate switch: =bob */
		u = strdup(argv[i+1]);
		*u = '+';
		if (strstr(u, "+guess") == u) {
			fprintf(stderr, "invalid user: %s\n", u+1);
			exit(1);
		}
		if (!switch_user(u, 0)) {
			fprintf(stderr, "Could not switch to user: %s\n", u+1);
			exit(1);
		} else {
			fprintf(stderr, "Switched to user: %s\n", u+1);
			started_as_root = 2;
		}
		free(u);
		break;
	}
}

static void quick_pw(char *str) {
	char *p, *q;
	char tmp[1024];
	int db = 0;

	if (db) fprintf(stderr, "quick_pw: %s\n", str);

	if (! str || str[0] == '\0') {
		exit(1);
	}
	if (str[0] != '%') {
		exit(1);
	}
	/*
	 * "%-" or "%stdin" means read one line from stdin.
	 *
	 * "%env" means it is in $UNIXPW env var.
	 *
	 * starting "%/" or "%." means read the first line from that file.
	 *
	 * "%%" or "%" means prompt user.
	 *
	 * otherwise: %user:pass
	 */
	if (!strcmp(str, "%-") || !strcmp(str, "%stdin")) {
		if(fgets(tmp, 1024, stdin) == NULL) {
			exit(1);
		}
		q = strdup(tmp);
	} else if (!strcmp(str, "%env")) {
		if (getenv("UNIXPW") == NULL) {
			exit(1);
		}
		q = strdup(getenv("UNIXPW"));
	} else if (!strcmp(str, "%%") || !strcmp(str, "%")) {
		char *t, inp[1024];
		fprintf(stdout, "username: ");
		if(fgets(tmp, 128, stdin) == NULL) {
			exit(1);
		}
		strcpy(inp, tmp);
		t = strchr(inp, '\n');
		if (t) {
			*t = ':'; 
		} else {
			strcat(inp, ":");
			
		}
		fprintf(stdout, "password: ");
		/* test mode: no_external_cmds does not apply */
		system("stty -echo");
		if(fgets(tmp, 128, stdin) == NULL) {
			fprintf(stdout, "\n");
			system("stty echo");
			exit(1);
		}
		system("stty echo");
		fprintf(stdout, "\n");
		strcat(inp, tmp);
		q = strdup(inp);
	} else if (str[1] == '/' || str[1] == '.') {
		FILE *in = fopen(str+1, "r");
		if (in == NULL) {
			exit(1);
		}
		if(fgets(tmp, 1024, in) == NULL) {
			exit(1);
		}
		q = strdup(tmp);
	} else {
		q = strdup(str+1);
	}
	p = (char *) malloc(strlen(q) + 10);
	strcpy(p, q);
	if (strchr(p, '\n') == NULL) {
		strcat(p, "\n");
	}

	if ((q = strchr(p, ':')) == NULL) {
		exit(1);
	}
	*q = '\0';
	if (db) fprintf(stderr, "'%s' '%s'\n", p, q+1);
	if (unixpw_cmd) {
		if (cmd_verify(p, q+1)) {
			fprintf(stdout, "Y %s\n", p);
			exit(0);
		} else {
			fprintf(stdout, "N %s\n", p);
			exit(1);
		}
	} else if (unixpw_nis) {
		if (crypt_verify(p, q+1)) {
			fprintf(stdout, "Y %s\n", p);
			exit(0);
		} else {
			fprintf(stdout, "N %s\n", p);
			exit(1);
		}
	} else {
		if (su_verify(p, q+1, NULL, NULL, NULL)) {
			fprintf(stdout, "Y %s\n", p);
			exit(0);
		} else {
			fprintf(stdout, "N %s\n", p);
			exit(1);
		}
	}
	/* NOTREACHED */
	exit(1);
}

static void print_settings(int try_http, int bg, char *gui_str) {

	fprintf(stderr, "\n");
	fprintf(stderr, "Settings:\n");
	fprintf(stderr, " display:    %s\n", use_dpy ? use_dpy
	    : "null");
#if SMALL_FOOTPRINT < 2
	fprintf(stderr, " authfile:   %s\n", auth_file ? auth_file
	    : "null");
	fprintf(stderr, " subwin:     0x%lx\n", subwin);
	fprintf(stderr, " -sid mode:  %d\n", rootshift);
	fprintf(stderr, " clip:       %s\n", clip_str ? clip_str
	    : "null");
	fprintf(stderr, " flashcmap:  %d\n", flash_cmap);
	fprintf(stderr, " shiftcmap:  %d\n", shift_cmap);
	fprintf(stderr, " force_idx:  %d\n", force_indexed_color);
	fprintf(stderr, " cmap8to24:  %d\n", cmap8to24);
	fprintf(stderr, " 8to24_opts: %s\n", cmap8to24_str ? cmap8to24_str
	    : "null");
	fprintf(stderr, " 24to32:     %d\n", xform24to32);
	fprintf(stderr, " visual:     %s\n", visual_str ? visual_str
	    : "null");
	fprintf(stderr, " overlay:    %d\n", overlay);
	fprintf(stderr, " ovl_cursor: %d\n", overlay_cursor);
	fprintf(stderr, " scaling:    %d %.4f\n", scaling, scale_fac);
	fprintf(stderr, " viewonly:   %d\n", view_only);
	fprintf(stderr, " shared:     %d\n", shared);
	fprintf(stderr, " conn_once:  %d\n", connect_once);
	fprintf(stderr, " timeout:    %d\n", first_conn_timeout);
	fprintf(stderr, " inetd:      %d\n", inetd);
	fprintf(stderr, " filexfer:   %d\n", filexfer);
	fprintf(stderr, " http:       %d\n", try_http);
	fprintf(stderr, " connect:    %s\n", client_connect
	    ? client_connect : "null");
	fprintf(stderr, " connectfile %s\n", client_connect_file
	    ? client_connect_file : "null");
	fprintf(stderr, " vnc_conn:   %d\n", vnc_connect);
	fprintf(stderr, " allow:      %s\n", allow_list ? allow_list
	    : "null");
	fprintf(stderr, " input:      %s\n", allowed_input_str
	    ? allowed_input_str : "null");
	fprintf(stderr, " passfile:   %s\n", passwdfile ? passwdfile
	    : "null");
	fprintf(stderr, " unixpw:     %d\n", unixpw);
	fprintf(stderr, " unixpw_lst: %s\n", unixpw_list ? unixpw_list:"null");
	fprintf(stderr, " ssl:        %s\n", openssl_pem ? openssl_pem:"null");
	fprintf(stderr, " ssldir:     %s\n", ssl_certs_dir ? ssl_certs_dir:"null");
	fprintf(stderr, " ssltimeout  %d\n", ssl_timeout_secs);
	fprintf(stderr, " sslverify:  %s\n", ssl_verify ? ssl_verify:"null");
	fprintf(stderr, " stunnel:    %d\n", use_stunnel);
	fprintf(stderr, " accept:     %s\n", accept_cmd ? accept_cmd
	    : "null");
	fprintf(stderr, " accept:     %s\n", afteraccept_cmd ? afteraccept_cmd
	    : "null");
	fprintf(stderr, " gone:       %s\n", gone_cmd ? gone_cmd
	    : "null");
	fprintf(stderr, " users:      %s\n", users_list ? users_list
	    : "null");
	fprintf(stderr, " using_shm:  %d\n", using_shm);
	fprintf(stderr, " flipbytes:  %d\n", flip_byte_order);
	fprintf(stderr, " onetile:    %d\n", single_copytile);
	fprintf(stderr, " solid:      %s\n", solid_str
	    ? solid_str : "null");
	fprintf(stderr, " blackout:   %s\n", blackout_str
	    ? blackout_str : "null");
	fprintf(stderr, " xinerama:   %d\n", xinerama);
	fprintf(stderr, " xtrap:      %d\n", xtrap_input);
	fprintf(stderr, " xrandr:     %d\n", xrandr);
	fprintf(stderr, " xrandrmode: %s\n", xrandr_mode ? xrandr_mode
	    : "null");
	fprintf(stderr, " padgeom:    %s\n", pad_geometry
	    ? pad_geometry : "null");
	fprintf(stderr, " logfile:    %s\n", logfile ? logfile
	    : "null");
	fprintf(stderr, " logappend:  %d\n", logfile_append);
	fprintf(stderr, " flag:       %s\n", flagfile ? flagfile
	    : "null");
	fprintf(stderr, " rc_file:    \"%s\"\n", rc_rcfile ? rc_rcfile
	    : "null");
	fprintf(stderr, " norc:       %d\n", rc_norc);
	fprintf(stderr, " dbg:        %d\n", crash_debug);
	fprintf(stderr, " bg:         %d\n", bg);
	fprintf(stderr, " mod_tweak:  %d\n", use_modifier_tweak);
	fprintf(stderr, " isolevel3:  %d\n", use_iso_level3);
	fprintf(stderr, " xkb:        %d\n", use_xkb_modtweak);
	fprintf(stderr, " skipkeys:   %s\n",
	    skip_keycodes ? skip_keycodes : "null");
	fprintf(stderr, " sloppykeys: %d\n", sloppy_keys);
	fprintf(stderr, " skip_dups:  %d\n", skip_duplicate_key_events);
	fprintf(stderr, " addkeysyms: %d\n", add_keysyms);
	fprintf(stderr, " xkbcompat:  %d\n", xkbcompat);
	fprintf(stderr, " clearmods:  %d\n", clear_mods);
	fprintf(stderr, " remap:      %s\n", remap_file ? remap_file
	    : "null");
	fprintf(stderr, " norepeat:   %d\n", no_autorepeat);
	fprintf(stderr, " norepeatcnt:%d\n", no_repeat_countdown);
	fprintf(stderr, " nofb:       %d\n", nofb);
	fprintf(stderr, " watchbell:  %d\n", watch_bell);
	fprintf(stderr, " watchsel:   %d\n", watch_selection);
	fprintf(stderr, " watchprim:  %d\n", watch_primary);
	fprintf(stderr, " seldir:     %s\n", sel_direction ?
	    sel_direction : "null");
	fprintf(stderr, " cursor:     %d\n", show_cursor);
	fprintf(stderr, " multicurs:  %d\n", show_multiple_cursors);
	fprintf(stderr, " curs_mode:  %s\n", multiple_cursors_mode
	    ? multiple_cursors_mode : "null");
	fprintf(stderr, " arrow:      %d\n", alt_arrow);
	fprintf(stderr, " xfixes:     %d\n", use_xfixes);
	fprintf(stderr, " alphacut:   %d\n", alpha_threshold);
	fprintf(stderr, " alphafrac:  %.2f\n", alpha_frac);
	fprintf(stderr, " alpharemove:%d\n", alpha_remove);
	fprintf(stderr, " alphablend: %d\n", alpha_blend);
	fprintf(stderr, " cursorshape:%d\n", cursor_shape_updates);
	fprintf(stderr, " cursorpos:  %d\n", cursor_pos_updates);
	fprintf(stderr, " xwarpptr:   %d\n", use_xwarppointer);
	fprintf(stderr, " buttonmap:  %s\n", pointer_remap
	    ? pointer_remap : "null");
	fprintf(stderr, " dragging:   %d\n", show_dragging);
	fprintf(stderr, " ncache:     %d\n", ncache);
	fprintf(stderr, " wireframe:  %s\n", wireframe_str ?
	    wireframe_str : WIREFRAME_PARMS);
	fprintf(stderr, " wirecopy:   %s\n", wireframe_copyrect ?
	    wireframe_copyrect : wireframe_copyrect_default);
	fprintf(stderr, " scrollcopy: %s\n", scroll_copyrect ?
	    scroll_copyrect : scroll_copyrect_default);
	fprintf(stderr, "  scr_area:  %d\n", scrollcopyrect_min_area);
	fprintf(stderr, "  scr_skip:  %s\n", scroll_skip_str ?
	    scroll_skip_str : scroll_skip_str0);
	fprintf(stderr, "  scr_inc:   %s\n", scroll_good_str ?
	    scroll_good_str : scroll_good_str0);
	fprintf(stderr, "  scr_keys:  %s\n", scroll_key_list_str ?
	    scroll_key_list_str : "null");
	fprintf(stderr, "  scr_term:  %s\n", scroll_term_str ?
	    scroll_term_str : "null");
	fprintf(stderr, "  scr_keyrep: %s\n", max_keyrepeat_str ?
	    max_keyrepeat_str : "null");
	fprintf(stderr, "  scr_parms: %s\n", scroll_copyrect_str ?
	    scroll_copyrect_str : SCROLL_COPYRECT_PARMS);
	fprintf(stderr, " fixscreen:  %s\n", screen_fixup_str ?
	    screen_fixup_str : "null");
	fprintf(stderr, " noxrecord:  %d\n", noxrecord);
	fprintf(stderr, " grabbuster: %d\n", grab_buster);
	fprintf(stderr, " ptr_mode:   %d\n", pointer_mode);
	fprintf(stderr, " inputskip:  %d\n", ui_skip);
	fprintf(stderr, " speeds:     %s\n", speeds_str
	    ? speeds_str : "null");
	fprintf(stderr, " wmdt:       %s\n", wmdt_str
	    ? wmdt_str : "null");
	fprintf(stderr, " debug_ptr:  %d\n", debug_pointer);
	fprintf(stderr, " debug_key:  %d\n", debug_keyboard);
	fprintf(stderr, " defer:      %d\n", defer_update);
	fprintf(stderr, " waitms:     %d\n", waitms);
	fprintf(stderr, " wait_ui:    %.2f\n", wait_ui);
	fprintf(stderr, " nowait_bog: %d\n", !wait_bog);
	fprintf(stderr, " slow_fb:    %.2f\n", slow_fb);
	fprintf(stderr, " readtimeout: %d\n", rfbMaxClientWait/1000);
	fprintf(stderr, " take_naps:  %d\n", take_naps);
	fprintf(stderr, " sb:         %d\n", screen_blank);
	fprintf(stderr, " fbpm:       %d\n", !watch_fbpm);
	fprintf(stderr, " dpms:       %d\n", !watch_dpms);
	fprintf(stderr, " xdamage:    %d\n", use_xdamage);
	fprintf(stderr, "  xd_area:   %d\n", xdamage_max_area);
	fprintf(stderr, "  xd_mem:    %.3f\n", xdamage_memory);
	fprintf(stderr, " sigpipe:    %s\n", sigpipe
	    ? sigpipe : "null");
	fprintf(stderr, " threads:    %d\n", use_threads);
	fprintf(stderr, " fs_frac:    %.2f\n", fs_frac);
	fprintf(stderr, " gaps_fill:  %d\n", gaps_fill);
	fprintf(stderr, " grow_fill:  %d\n", grow_fill);
	fprintf(stderr, " tile_fuzz:  %d\n", tile_fuzz);
	fprintf(stderr, " snapfb:     %d\n", use_snapfb);
	fprintf(stderr, " rawfb:      %s\n", raw_fb_str
	    ? raw_fb_str : "null");
	fprintf(stderr, " pipeinput:  %s\n", pipeinput_str
	    ? pipeinput_str : "null");
	fprintf(stderr, " gui:        %d\n", launch_gui);
	fprintf(stderr, " gui_mode:   %s\n", gui_str
	    ? gui_str : "null");
	fprintf(stderr, " noremote:   %d\n", !accept_remote_cmds);
	fprintf(stderr, " unsafe:     %d\n", !safe_remote_only);
	fprintf(stderr, " privremote: %d\n", priv_remote);
	fprintf(stderr, " safer:      %d\n", more_safe);
	fprintf(stderr, " nocmds:     %d\n", no_external_cmds);
	fprintf(stderr, " deny_all:   %d\n", deny_all);
	fprintf(stderr, " pid:        %d\n", getpid());
	fprintf(stderr, "\n");
#endif
}


static void check_loop_mode(int argc, char* argv[]) {
	int i;
	int loop_mode = 0, loop_sleep = 2000, loop_max = 0;

	for (i=1; i < argc; i++) {
		char *p = argv[i];
		if (strstr(p, "--") == p) {
			p++;
		}
		if (strstr(p, "-loop") == p) {
			char *q;
			loop_mode = 1;
			if ((q = strchr(p, ',')) != NULL) {
				loop_max = atoi(q+1);
				*q = '\0';
			}
			
			q = strpbrk(p, "0123456789");
			if (q) {
				loop_sleep = atoi(q);
				if (loop_sleep <= 0) {
					loop_sleep = 10;
				}
			}
		}
	}
	if (loop_mode && getenv("X11VNC_LOOP_MODE") == NULL) {
#if LIBVNCSERVER_HAVE_FORK
		char **argv2;
		int k, i = 1;

		set_env("X11VNC_LOOP_MODE", "1");
		argv2 = (char **) malloc((argc+1)*sizeof(char *));

		for (k=0; k < argc+1; k++) {
			argv2[k] = NULL;
			if (k < argc) {
				argv2[k] = argv[k];
			}
		}
		while (1) {
			int status;
			pid_t p;
			fprintf(stderr, "\n --- x11vnc loop: %d ---\n\n", i++);
			fflush(stderr);
			usleep(500 * 1000);
			if ((p = fork()) > 0)  {
				fprintf(stderr, " --- x11vnc loop: waiting "
				    "for: %d\n\n", p);
				wait(&status);
			} else if (p == -1) {
				fprintf(stderr, "could not fork\n");
				perror("fork");
				exit(1);
			} else {
				/* loop mode: no_external_cmds does not apply */
				execvp(argv[0], argv2); 
				exit(1);
			}

			if (loop_max > 0 && i > loop_max) {
				fprintf(stderr, "\n --- x11vnc loop: did %d"
				    " done. ---\n\n", loop_max);
				break;
			}
			
			fprintf(stderr, "\n --- x11vnc loop: sleeping %d ms "
			    "---\n\n", loop_sleep);
			usleep(loop_sleep * 1000);
		}
		exit(0);
#else
		fprintf(stderr, "fork unavailable, cannot do -loop mode\n");
		exit(1);
#endif
	}
}
static void store_homedir_passwd(char *file) {
	char str1[32], str2[32], *p, *h, *f;
	struct stat sbuf;

	str1[0] = '\0';
	str2[0] = '\0';

	/* storepasswd */
	if (no_external_cmds || !cmd_ok("storepasswd")) {
		fprintf(stderr, "-nocmds cannot be used with -storepasswd\n");
		exit(1);
	}

	fprintf(stderr, "Enter VNC password: ");
	system("stty -echo");
	if (fgets(str1, 32, stdin) == NULL) {
		system("stty echo");
		exit(1);
	}
	fprintf(stderr, "\n");

	fprintf(stderr, "Verify password:    ");
	if (fgets(str2, 32, stdin) == NULL) {
		system("stty echo");
		exit(1);
	}
	fprintf(stderr, "\n");
	system("stty echo");

	if ((p = strchr(str1, '\n')) != NULL) {
		*p = '\0';
	}
	if ((p = strchr(str2, '\n')) != NULL) {
		*p = '\0';
	}
	if (strcmp(str1, str2)) {
		fprintf(stderr, "** passwords differ.\n");
		exit(1);
	}
	if (str1[0] == '\0') {
		fprintf(stderr, "** no password supplied.\n");
		exit(1);
	}

	if (file != NULL) {
		f = file;
	} else {
		
		h = getenv("HOME");
		if (! h) {
			fprintf(stderr, "** $HOME not set.\n");
			exit(1);
		}

		f = (char *) malloc(strlen(h) + strlen("/.vnc/passwd") + 1);
		sprintf(f, "%s/.vnc", h);

		if (stat(f, &sbuf) != 0) {
			if (mkdir(f, 0755) != 0) {
				fprintf(stderr, "** could not create directory %s\n", f);
				perror("mkdir");
				exit(1);
			}
		} else if (! S_ISDIR(sbuf.st_mode)) {
			fprintf(stderr, "** not a directory %s\n", f);
			exit(1);
		}

		sprintf(f, "%s/.vnc/passwd", h);
	}
	fprintf(stderr, "Write password to %s?  [y]/n ", f);

	if (fgets(str2, 32, stdin) == NULL) {
		exit(1);
	}
	if (str2[0] == 'n' || str2[0] == 'N') {
		fprintf(stderr, "not creating password.\n");
		exit(1);
	}

	if (rfbEncryptAndStorePasswd(str1, f) != 0) {
		fprintf(stderr, "** error creating password.\n");
		perror("storepasswd");
		exit(1);
	}
	fprintf(stderr, "Password written to: %s\n", f);
	if (stat(f, &sbuf) != 0) {
		exit(1);
	}
	exit(0);
}

void ncache_beta_tester_message(void) {

char msg[] = 
"\n"
"***************************************************************************\n"
"\n"
"Hello!  Exciting News!!\n"
"\n"
"You have been selected at random to beta-test the x11vnc '-ncache' VNC\n"
"client-side pixel caching feature!\n"
"\n"
"This scheme stores pixel data offscreen on the VNC viewer side for faster\n"
"retrieval.  It should work with any VNC viewer.\n"
"\n"
"This method requires much testing and so we hope you will try it out and\n"
"perhaps even report back your observations.  However, if you do not want\n"
"to test or use the feature, run x11vnc like this:\n"
"\n"
"    x11vnc -ncache 0 ...\n"
"\n"
"The feature needs additional testing because we want to have x11vnc\n"
"performance enhancements on by default.  Otherwise, only a relative few\n"
"would notice and use the -ncache option (e.g. the wireframe and scroll\n"
"detection features are on by default).  A couple things to note:\n"
"\n"
"    1) It uses a large amount of RAM (on both viewer and server sides)\n"
"\n"
"    2) You can actually see the cached pixel data if you scroll down\n"
"       to it in your viewer; adjust your viewer's size to hide it.\n"
"\n"
"More info: http://www.karlrunge.com/x11vnc/#faq-client-caching\n"
"waiting for connections:\n"
;

	if (raw_fb_str && !macosx_console) {
		return;
	}
	if (nofb) {
		return;
	}
	
	fprintf(stderr, "%s", msg);

}

#define	SHOW_NO_PASSWORD_WARNING \
	(!got_passwd && !got_rfbauth && (!got_passwdfile || !passwd_list) \
	    && !query_cmd && !remote_cmd && !unixpw && !got_gui_pw \
	    && ! ssl_verify && !inetd)

extern int dragum(void);

int main(int argc, char* argv[]) {

	int i, len, tmpi;
	int ev, er, maj, min;
	char *arg;
	int remote_sync = 0;
	char *remote_cmd = NULL;
	char *query_cmd  = NULL;
	char *gui_str = NULL;
	int got_gui_pw = 0;
	int pw_loc = -1, got_passwd = 0, got_rfbauth = 0, nopw = NOPW;
	int got_viewpasswd = 0, got_localhost = 0, got_passwdfile = 0;
	int vpw_loc = -1;
	int dt = 0, bg = 0;
	int got_rfbwait = 0;
	int got_httpdir = 0, try_http = 0;
	int waited_for_client = 0;
	XImage *fb0 = NULL;

	/* used to pass args we do not know about to rfbGetScreen(): */
	int argc_vnc_max = 1024;
	int argc_vnc = 1; char *argv_vnc[2048];


	/* check for -loop mode: */
	check_loop_mode(argc, argv);

	dtime0(&x11vnc_start);

	if (!getuid() || !geteuid()) {
		started_as_root = 1;

		/* check for '-users =bob' */
		immediate_switch_user(argc, argv);
	}

	for (i=0; i < 2048; i++) {
		argv_vnc[i] = NULL;
	}

	argv_vnc[0] = strdup(argv[0]);
	program_name = strdup(argv[0]);
	program_pid = (int) getpid();

	solid_default = strdup(solid_default);	/* for freeing with -R */

	len = 0;
	for (i=1; i < argc; i++) {
		len += strlen(argv[i]) + 4 + 1;
	}
	program_cmdline = (char *) malloc(len+1);
	program_cmdline[0] = '\0';
	for (i=1; i < argc; i++) {
		char *s = argv[i];
		if (program_cmdline[0]) {
			strcat(program_cmdline, " ");
		}
		if (*s == '-') {
			strcat(program_cmdline, s);
		} else {
			strcat(program_cmdline, "{{");
			strcat(program_cmdline, s);
			strcat(program_cmdline, "}}");
		}
	}

	for (i=0; i<ICON_MODE_SOCKS; i++) {
		icon_mode_socks[i] = -1;
	}

	check_rcfile(argc, argv);
	/* kludge for the new array argv2 set in check_rcfile() */
#	define argc argc2
#	define argv argv2

#	define CHECK_ARGC if (i >= argc-1) { \
		fprintf(stderr, "not enough arguments for: %s\n", arg); \
		exit(1); \
	}

	/*
	 * do a quick check for parameters that apply to "utility"
	 * commands, i.e. ones that do not run the server.
	 */
	for (i=1; i < argc; i++) {
		arg = argv[i];
		if (strstr(arg, "--") == arg) {
			arg++;
		}
		if (!strcmp(arg, "-ssldir")) {
			CHECK_ARGC
			ssl_certs_dir = strdup(argv[++i]);
		}
	}

	/*
	 * do a quick check for -env parameters
	 */
	for (i=1; i < argc; i++) {
		char *p, *q;
		arg = argv[i];
		if (strstr(arg, "--") == arg) {
			arg++;
		}
		if (!strcmp(arg, "-env")) {
			CHECK_ARGC
			p = strdup(argv[++i]);
			q = strchr(p, '=');
			if (! q) {
				fprintf(stderr, "no -env '=' found: %s\n", p);
				exit(1);
			} else {
				*q = '\0';
			}
			set_env(p, q+1);
			free(p);
		}
	}

	for (i=1; i < argc; i++) {
		/* quick-n-dirty --option handling. */
		arg = argv[i];
		if (strstr(arg, "--") == arg) {
			arg++;
		}

		if (!strcmp(arg, "-display")) {
			CHECK_ARGC
			use_dpy = strdup(argv[++i]);
			if (strstr(use_dpy, "WAIT")) {
				extern char find_display[];
				extern char create_display[];
				if (strstr(use_dpy, "cmd=FINDDISPLAY-print")) {
					fprintf(stdout, "%s", find_display);
					exit(0);
				}
				if (strstr(use_dpy, "cmd=FINDCREATEDISPLAY-print")) {
					fprintf(stdout, "%s", create_display);
					exit(0);
				}
			}
		} else if (!strcmp(arg, "-auth") || !strcmp(arg, "-xauth")) {
			CHECK_ARGC
			auth_file = strdup(argv[++i]);
		} else if (!strcmp(arg, "-id") || !strcmp(arg, "-sid")) {
			CHECK_ARGC
			if (!strcmp(arg, "-sid")) {
				rootshift = 1;
			} else {
				rootshift = 0;
			}
			i++;
			if (!strcmp("pick", argv[i])) {
				if (started_as_root) {
					fprintf(stderr, "unsafe: %s pick\n",
					    arg);
					exit(1);
				} else if (! pick_windowid(&subwin)) {
					fprintf(stderr, "invalid %s pick\n",
					    arg);
					exit(1);
				}
			} else if (! scan_hexdec(argv[i], &subwin)) {
				fprintf(stderr, "invalid %s arg: %s\n", arg,
				    argv[i]);
				exit(1);
			}
		} else if (!strcmp(arg, "-waitmapped")) {
			subwin_wait_mapped = 1;
		} else if (!strcmp(arg, "-clip")) {
			CHECK_ARGC
			clip_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-flashcmap")) {
			flash_cmap = 1;
		} else if (!strcmp(arg, "-shiftcmap")) {
			CHECK_ARGC
			shift_cmap = atoi(argv[++i]);
		} else if (!strcmp(arg, "-notruecolor")) {
			force_indexed_color = 1;
		} else if (!strcmp(arg, "-overlay")) {
			overlay = 1;
		} else if (!strcmp(arg, "-overlay_nocursor")) {
			overlay = 1;
			overlay_cursor = 0;
		} else if (!strcmp(arg, "-overlay_yescursor")) {
			overlay = 1;
			overlay_cursor = 2;
#if !SKIP_8TO24
		} else if (!strcmp(arg, "-8to24")) {
			cmap8to24 = 1;
			if (i < argc-1) {
				char *s = argv[i+1];
				if (s[0] != '-') {
					cmap8to24_str = strdup(s);
					i++;
				}
			}
#endif
		} else if (!strcmp(arg, "-24to32")) {
			xform24to32 = 1;
		} else if (!strcmp(arg, "-visual")) {
			CHECK_ARGC
			visual_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-scale")) {
			CHECK_ARGC
			scale_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-scale_cursor")) {
			CHECK_ARGC
			scale_cursor_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-viewonly")) {
			view_only = 1;
		} else if (!strcmp(arg, "-noviewonly")) {
			view_only = 0;
			got_noviewonly = 1;
		} else if (!strcmp(arg, "-shared")) {
			shared = 1;
		} else if (!strcmp(arg, "-once")) {
			connect_once = 1;
			got_connect_once = 1;
		} else if (!strcmp(arg, "-many") || !strcmp(arg, "-forever")) {
			connect_once = 0;
		} else if (strstr(arg, "-loop") == arg) {
			;	/* handled above */
		} else if (!strcmp(arg, "-timeout")) {
			CHECK_ARGC
			first_conn_timeout = atoi(argv[++i]);
		} else if (!strcmp(arg, "-users")) {
			CHECK_ARGC
			users_list = strdup(argv[++i]);
		} else if (!strcmp(arg, "-inetd")) {
			inetd = 1;
		} else if (!strcmp(arg, "-nofilexfer")) {
			filexfer = 0;
		} else if (!strcmp(arg, "-filexfer")) {
			filexfer = 1;
		} else if (!strcmp(arg, "-http")) {
			try_http = 1;
		} else if (!strcmp(arg, "-http_ssl")) {
			try_http = 1;
			http_ssl = 1;
		} else if (!strcmp(arg, "-connect") ||
		    !strcmp(arg, "-connect_or_exit")) {
			CHECK_ARGC
			if (strchr(argv[++i], '/')) {
				client_connect_file = strdup(argv[i]);
			} else {
				client_connect = strdup(argv[i]);
			}
			if (!strcmp(arg, "-connect_or_exit")) {
				connect_or_exit = 1;
			}
		} else if (!strcmp(arg, "-vncconnect")) {
			vnc_connect = 1;
		} else if (!strcmp(arg, "-novncconnect")) {
			vnc_connect = 0;
		} else if (!strcmp(arg, "-allow")) {
			CHECK_ARGC
			allow_list = strdup(argv[++i]);
		} else if (!strcmp(arg, "-localhost")) {
			allow_list = strdup("127.0.0.1");
			got_localhost = 1;
		} else if (!strcmp(arg, "-nolookup")) {
			host_lookup = 0;
		} else if (!strcmp(arg, "-input")) {
			CHECK_ARGC
			allowed_input_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-grabkbd")) {
			grab_kbd = 1;
		} else if (!strcmp(arg, "-grabptr")) {
			grab_ptr = 1;
		} else if (!strcmp(arg, "-viewpasswd")) {
			vpw_loc = i;
			CHECK_ARGC
			viewonly_passwd = strdup(argv[++i]);
			got_viewpasswd = 1;
		} else if (!strcmp(arg, "-passwdfile")) {
			CHECK_ARGC
			passwdfile = strdup(argv[++i]);
			got_passwdfile = 1;
#ifndef NO_SSL_OR_UNIXPW
		} else if (!strcmp(arg, "-unixpw_cmd")
		    || !strcmp(arg, "-unixpw_cmd_unsafe")) {
			CHECK_ARGC
			unixpw_cmd = strdup(argv[++i]);
			unixpw = 1;
			if (strstr(arg, "_unsafe")) {
				/* hidden option for testing. */
				set_env("UNIXPW_DISABLE_SSL", "1");
				set_env("UNIXPW_DISABLE_LOCALHOST", "1");
			}
		} else if (strstr(arg, "-unixpw") == arg) {
			unixpw = 1;
			if (strstr(arg, "-unixpw_nis")) {
				unixpw_nis = 1;
			}
			if (i < argc-1) {
				char *s = argv[i+1];
				if (s[0] != '-') {
					unixpw_list = strdup(s);
					i++;
				}
				if (s[0] == '%') {
					unixpw_list = NULL;
					quick_pw(s);
					exit(1);
				}
			}
			if (strstr(arg, "_unsafe")) {
				/* hidden option for testing. */
				set_env("UNIXPW_DISABLE_SSL", "1");
				set_env("UNIXPW_DISABLE_LOCALHOST", "1");
			}
		} else if (!strcmp(arg, "-ssl")) {
			use_openssl = 1;
			if (i < argc-1) {
				char *s = argv[i+1];
				if (s[0] != '-') {
					openssl_pem = strdup(s);
					i++;
				}
			}
		} else if (!strcmp(arg, "-ssltimeout")) {
			CHECK_ARGC
			ssl_timeout_secs = atoi(argv[++i]);
		} else if (!strcmp(arg, "-sslnofail")) {
			ssl_no_fail = 1;
		} else if (!strcmp(arg, "-ssldir")) {
			CHECK_ARGC
			ssl_certs_dir = strdup(argv[++i]);

		} else if (!strcmp(arg, "-sslverify")) {
			CHECK_ARGC
			ssl_verify = strdup(argv[++i]);

		} else if (!strcmp(arg, "-sslGenCA")) {
			char *cdir = NULL;
			if (i < argc-1) {
				char *s = argv[i+1];
				if (s[0] != '-') {
					cdir = strdup(s);
					i++;
				}
			}
			sslGenCA(cdir);
			exit(0);
		} else if (!strcmp(arg, "-sslGenCert")) {
			char *ty, *nm = NULL;
			if (i >= argc-1) {
				fprintf(stderr, "Must be:\n");
				fprintf(stderr, "          x11vnc -sslGenCert server ...\n");
				fprintf(stderr, "or        x11vnc -sslGenCert client ...\n");
				exit(1);
			}
			ty = argv[i+1];
			if (strcmp(ty, "server") && strcmp(ty, "client")) {
				fprintf(stderr, "Must be:\n");
				fprintf(stderr, "          x11vnc -sslGenCert server ...\n");
				fprintf(stderr, "or        x11vnc -sslGenCert client ...\n");
				exit(1);
			}
			if (i < argc-2) {
				nm = argv[i+2];
			}
			sslGenCert(ty, nm);
			exit(0);
		} else if (!strcmp(arg, "-sslEncKey")) {
			if (i < argc-1) {
				char *s = argv[i+1];
				sslEncKey(s, 0);
			}
			exit(0);
		} else if (!strcmp(arg, "-sslCertInfo")) {
			if (i < argc-1) {
				char *s = argv[i+1];
				sslEncKey(s, 1);
			}
			exit(0);
		} else if (!strcmp(arg, "-sslDelCert")) {
			if (i < argc-1) {
				char *s = argv[i+1];
				sslEncKey(s, 2);
			}
			exit(0);

		} else if (!strcmp(arg, "-stunnel")) {
			use_stunnel = 1;
			if (i < argc-1) {
				char *s = argv[i+1];
				if (s[0] != '-') {
					stunnel_pem = strdup(s);
					i++;
				}
			}
		} else if (!strcmp(arg, "-stunnel3")) {
			use_stunnel = 3;
			if (i < argc-1) {
				char *s = argv[i+1];
				if (s[0] != '-') {
					stunnel_pem = strdup(s);
					i++;
				}
			}
		} else if (!strcmp(arg, "-https")) {
			https_port_num = 0;
			try_http = 1;
			if (i < argc-1) {
				char *s = argv[i+1];
				if (s[0] != '-') {
					https_port_num = atoi(s);
					i++;
				}
			}
#endif
		} else if (!strcmp(arg, "-nopw")) {
			nopw = 1;
		} else if (!strcmp(arg, "-usepw")) {
			usepw = 1;
		} else if (!strcmp(arg, "-storepasswd")) {
			if (argc == i+1) {
				store_homedir_passwd(NULL);
				exit(0);
			}
			if (argc == i+2) {
				store_homedir_passwd(argv[i+1]);
				exit(0);
			}
			if (argc >= i+4 || rfbEncryptAndStorePasswd(argv[i+1],
			    argv[i+2]) != 0) {
				fprintf(stderr, "-storepasswd failed\n");
				exit(1);
			} else {
				fprintf(stderr, "stored passwd in file %s\n",
				    argv[i+2]);
				exit(0);
			}
		} else if (!strcmp(arg, "-accept")) {
			CHECK_ARGC
			accept_cmd = strdup(argv[++i]);
		} else if (!strcmp(arg, "-afteraccept")) {
			CHECK_ARGC
			afteraccept_cmd = strdup(argv[++i]);
		} else if (!strcmp(arg, "-gone")) {
			CHECK_ARGC
			gone_cmd = strdup(argv[++i]);
		} else if (!strcmp(arg, "-noshm")) {
			using_shm = 0;
		} else if (!strcmp(arg, "-flipbyteorder")) {
			flip_byte_order = 1;
		} else if (!strcmp(arg, "-onetile")) {
			single_copytile = 1;
		} else if (!strcmp(arg, "-solid")) {
			use_solid_bg = 1;
			if (i < argc-1) {
				char *s = argv[i+1];
				if (s[0] != '-') {
					solid_str = strdup(s);
					i++;
				}
			}
			if (! solid_str) {
				solid_str = strdup(solid_default);
			}
		} else if (!strcmp(arg, "-blackout")) {
			CHECK_ARGC
			blackout_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-xinerama")) {
			xinerama = 1;
		} else if (!strcmp(arg, "-xtrap")) {
			xtrap_input = 1;
		} else if (!strcmp(arg, "-xrandr")) {
			xrandr = 1;
			if (i < argc-1) {
				char *s = argv[i+1];
				if (known_xrandr_mode(s)) {
					xrandr_mode = strdup(s);
					i++;
				}
			}
		} else if (!strcmp(arg, "-rotate")) {
			CHECK_ARGC
			rotating_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-padgeom")
		    || !strcmp(arg, "-padgeometry")) {
			CHECK_ARGC
			pad_geometry = strdup(argv[++i]);
		} else if (!strcmp(arg, "-o") || !strcmp(arg, "-logfile")) {
			CHECK_ARGC
			logfile_append = 0;
			logfile = strdup(argv[++i]);
		} else if (!strcmp(arg, "-oa") || !strcmp(arg, "-logappend")) {
			CHECK_ARGC
			logfile_append = 1;
			logfile = strdup(argv[++i]);
		} else if (!strcmp(arg, "-flag")) {
			CHECK_ARGC
			flagfile = strdup(argv[++i]);
		} else if (!strcmp(arg, "-rc")) {
			i++;	/* done above */
		} else if (!strcmp(arg, "-norc")) {
			;	/* done above */
		} else if (!strcmp(arg, "-env")) {
			i++;	/* done above */
		} else if (!strcmp(arg, "-prog")) {
			CHECK_ARGC
			if (program_name) {
				free(program_name);
			}
			program_name = strdup(argv[++i]);
		} else if (!strcmp(arg, "-h") || !strcmp(arg, "-help")) {
			print_help(0);
		} else if (!strcmp(arg, "-?") || !strcmp(arg, "-opts")) {
			print_help(1);
		} else if (!strcmp(arg, "-V") || !strcmp(arg, "-version")) {
			fprintf(stdout, "x11vnc: %s\n", lastmod);
			exit(0);
		} else if (!strcmp(arg, "-license") ||
		    !strcmp(arg, "-copying") || !strcmp(arg, "-warranty")) {
			print_license();
		} else if (!strcmp(arg, "-dbg")) {
			crash_debug = 1;
		} else if (!strcmp(arg, "-nodbg")) {
			crash_debug = 0;
		} else if (!strcmp(arg, "-q") || !strcmp(arg, "-quiet")) {
			quiet = 1;
		} else if (!strcmp(arg, "-v") || !strcmp(arg, "-verbose")) {
			verbose = 1;
		} else if (!strcmp(arg, "-bg") || !strcmp(arg, "-background")) {
#if LIBVNCSERVER_HAVE_SETSID
			bg = 1;
			opts_bg = bg;
#else
			fprintf(stderr, "warning: -bg mode not supported.\n");
#endif
		} else if (!strcmp(arg, "-modtweak")) {
			use_modifier_tweak = 1;
		} else if (!strcmp(arg, "-nomodtweak")) {
			use_modifier_tweak = 0;
			got_nomodtweak = 1;
		} else if (!strcmp(arg, "-isolevel3")) {
			use_iso_level3 = 1;
		} else if (!strcmp(arg, "-xkb")) {
			use_modifier_tweak = 1;
			use_xkb_modtweak = 1;
		} else if (!strcmp(arg, "-noxkb")) {
			use_xkb_modtweak = 0;
			got_noxkb = 1;
		} else if (!strcmp(arg, "-capslock")) {
			watch_capslock = 1;
		} else if (!strcmp(arg, "-skip_lockkeys")) {
			skip_lockkeys = 1;
		} else if (!strcmp(arg, "-xkbcompat")) {
			xkbcompat = 1;
		} else if (!strcmp(arg, "-skip_keycodes")) {
			CHECK_ARGC
			skip_keycodes = strdup(argv[++i]);
		} else if (!strcmp(arg, "-sloppy_keys")) {
			sloppy_keys++;
		} else if (!strcmp(arg, "-skip_dups")) {
			skip_duplicate_key_events = 1;
		} else if (!strcmp(arg, "-noskip_dups")) {
			skip_duplicate_key_events = 0;
		} else if (!strcmp(arg, "-add_keysyms")) {
			add_keysyms++;
		} else if (!strcmp(arg, "-noadd_keysyms")) {
			add_keysyms = 0;
		} else if (!strcmp(arg, "-clear_mods")) {
			clear_mods = 1;
		} else if (!strcmp(arg, "-clear_keys")) {
			clear_mods = 2;
		} else if (!strcmp(arg, "-remap")) {
			CHECK_ARGC
			remap_file = strdup(argv[++i]);
		} else if (!strcmp(arg, "-norepeat")) {
			no_autorepeat = 1;
			if (i < argc-1) {
				char *s = argv[i+1];
				if (*s == '-') {
					s++;
				}
				if (isdigit((unsigned char) (*s))) {
					no_repeat_countdown = atoi(argv[++i]);
				}
			}
		} else if (!strcmp(arg, "-repeat")) {
			no_autorepeat = 0;
		} else if (!strcmp(arg, "-nofb")) {
			nofb = 1;
		} else if (!strcmp(arg, "-nobell")) {
			watch_bell = 0;
			sound_bell = 0;
		} else if (!strcmp(arg, "-nosel")) {
			watch_selection = 0;
			watch_primary = 0;
			watch_clipboard = 0;
		} else if (!strcmp(arg, "-noprimary")) {
			watch_primary = 0;
		} else if (!strcmp(arg, "-nosetprimary")) {
			set_primary = 0;
		} else if (!strcmp(arg, "-noclipboard")) {
			watch_clipboard = 0;
		} else if (!strcmp(arg, "-nosetclipboard")) {
			set_clipboard = 0;
		} else if (!strcmp(arg, "-seldir")) {
			CHECK_ARGC
			sel_direction = strdup(argv[++i]);
		} else if (!strcmp(arg, "-cursor")) {
			show_cursor = 1;
			if (i < argc-1) {
				char *s = argv[i+1];
				if (known_cursors_mode(s)) {
					multiple_cursors_mode = strdup(s);
					i++;
					if (!strcmp(s, "none")) {
						show_cursor = 0;
					}
				} 
			}
		} else if (!strcmp(arg, "-nocursor")) { 
			multiple_cursors_mode = strdup("none");
			show_cursor = 0;
		} else if (!strcmp(arg, "-cursor_drag")) { 
			cursor_drag_changes = 1;
		} else if (!strcmp(arg, "-nocursor_drag")) { 
			cursor_drag_changes = 0;
		} else if (!strcmp(arg, "-arrow")) {
			CHECK_ARGC
			alt_arrow = atoi(argv[++i]);
		} else if (!strcmp(arg, "-xfixes")) { 
			use_xfixes = 1;
		} else if (!strcmp(arg, "-noxfixes")) { 
			use_xfixes = 0;
		} else if (!strcmp(arg, "-alphacut")) {
			CHECK_ARGC
			alpha_threshold = atoi(argv[++i]);
		} else if (!strcmp(arg, "-alphafrac")) {
			CHECK_ARGC
			alpha_frac = atof(argv[++i]);
		} else if (!strcmp(arg, "-alpharemove")) {
			alpha_remove = 1;
		} else if (!strcmp(arg, "-noalphablend")) {
			alpha_blend = 0;
		} else if (!strcmp(arg, "-nocursorshape")) {
			cursor_shape_updates = 0;
		} else if (!strcmp(arg, "-cursorpos")) {
			cursor_pos_updates = 1;
			got_cursorpos = 1;
		} else if (!strcmp(arg, "-nocursorpos")) {
			cursor_pos_updates = 0;
		} else if (!strcmp(arg, "-xwarppointer")) {
			use_xwarppointer = 1;
		} else if (!strcmp(arg, "-noxwarppointer")) {
			use_xwarppointer = 0;
			got_noxwarppointer = 1;
		} else if (!strcmp(arg, "-buttonmap")) {
			CHECK_ARGC
			pointer_remap = strdup(argv[++i]);
		} else if (!strcmp(arg, "-nodragging")) {
			show_dragging = 0;
#ifndef NO_NCACHE
		} else if (!strcmp(arg, "-ncache")) {
			CHECK_ARGC
			ncache = atoi(argv[++i]);
			if (ncache % 2 != 0) {
				ncache++;
			}
		} else if (!strcmp(arg, "-ncache_cr")) {
			ncache_copyrect = 1;
		} else if (!strcmp(arg, "-ncache_no_moveraise")) {
			ncache_wf_raises = 1;
		} else if (!strcmp(arg, "-ncache_no_dtchange")) {
			ncache_dt_change = 0;
		} else if (!strcmp(arg, "-ncache_pad")) {
			CHECK_ARGC
			ncache_pad = atoi(argv[++i]);
#endif
		} else if (!strcmp(arg, "-wireframe")
		    || !strcmp(arg, "-wf")) {
			wireframe = 1;
			if (i < argc-1) {
				char *s = argv[i+1];
				if (*s != '-') {
					wireframe_str = strdup(argv[++i]);
				}
			}
		} else if (!strcmp(arg, "-nowireframe")
		    || !strcmp(arg, "-nowf")) {
			wireframe = 0;
		} else if (!strcmp(arg, "-nowireframelocal")
		    || !strcmp(arg, "-nowfl")) {
			wireframe_local = 0;
		} else if (!strcmp(arg, "-wirecopyrect")
		    || !strcmp(arg, "-wcr")) {
			CHECK_ARGC
			set_wirecopyrect_mode(argv[++i]);
			got_wirecopyrect = 1;
		} else if (!strcmp(arg, "-nowirecopyrect")
		    || !strcmp(arg, "-nowcr")) {
			set_wirecopyrect_mode("never");
		} else if (!strcmp(arg, "-debug_wireframe")
		    || !strcmp(arg, "-dwf")) {
			debug_wireframe++;
		} else if (!strcmp(arg, "-scrollcopyrect")
		    || !strcmp(arg, "-scr")) {
			CHECK_ARGC
			set_scrollcopyrect_mode(argv[++i]);
			got_scrollcopyrect = 1;
		} else if (!strcmp(arg, "-noscrollcopyrect")
		    || !strcmp(arg, "-noscr")) {
			set_scrollcopyrect_mode("never");
		} else if (!strcmp(arg, "-scr_area")) {
			int tn;
			CHECK_ARGC
			tn = atoi(argv[++i]);
			if (tn >= 0) {
				scrollcopyrect_min_area = tn;
			}
		} else if (!strcmp(arg, "-scr_skip")) {
			CHECK_ARGC
			scroll_skip_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-scr_inc")) {
			CHECK_ARGC
			scroll_good_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-scr_keys")) {
			CHECK_ARGC
			scroll_key_list_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-scr_term")) {
			CHECK_ARGC
			scroll_term_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-scr_keyrepeat")) {
			CHECK_ARGC
			max_keyrepeat_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-scr_parms")) {
			CHECK_ARGC
			scroll_copyrect_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-fixscreen")) {
			CHECK_ARGC
			screen_fixup_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-debug_scroll")
		    || !strcmp(arg, "-ds")) {
			debug_scroll++;
		} else if (!strcmp(arg, "-noxrecord")) {
			noxrecord = 1;
		} else if (!strcmp(arg, "-pointer_mode")
		    || !strcmp(arg, "-pm")) {
			char *p, *s;
			CHECK_ARGC
			s = argv[++i];
			if ((p = strchr(s, ':')) != NULL) {
				ui_skip = atoi(p+1);
				if (! ui_skip) ui_skip = 1;
				*p = '\0';
			}
			if (atoi(s) < 1 || atoi(s) > pointer_mode_max) {
				rfbLog("pointer_mode out of range 1-%d: %d\n",
				    pointer_mode_max, atoi(s));
			} else {
				pointer_mode = atoi(s);
				got_pointer_mode = pointer_mode;
			}
		} else if (!strcmp(arg, "-input_skip")) {
			CHECK_ARGC
			ui_skip = atoi(argv[++i]);
			if (! ui_skip) ui_skip = 1;
		} else if (!strcmp(arg, "-allinput")) {
			all_input = 1;
		} else if (!strcmp(arg, "-noallinput")) {
			all_input = 0;
		} else if (!strcmp(arg, "-speeds")) {
			CHECK_ARGC
			speeds_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-wmdt")) {
			CHECK_ARGC
			wmdt_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-debug_pointer")
		    || !strcmp(arg, "-dp")) {
			debug_pointer++;
		} else if (!strcmp(arg, "-debug_keyboard")
		    || !strcmp(arg, "-dk")) {
			debug_keyboard++;
		} else if (!strcmp(arg, "-defer")) {
			CHECK_ARGC
			defer_update = atoi(argv[++i]);
			got_defer = 1;
		} else if (!strcmp(arg, "-wait")) {
			CHECK_ARGC
			waitms = atoi(argv[++i]);
		} else if (!strcmp(arg, "-wait_ui")) {
			CHECK_ARGC
			wait_ui = atof(argv[++i]);
		} else if (!strcmp(arg, "-nowait_bog")) {
			wait_bog = 0;
		} else if (!strcmp(arg, "-slow_fb")) {
			CHECK_ARGC
			slow_fb = atof(argv[++i]);
		} else if (!strcmp(arg, "-readtimeout")) {
			CHECK_ARGC
			rfbMaxClientWait = atoi(argv[++i]) * 1000;
		} else if (!strcmp(arg, "-nap")) {
			take_naps = 1;
		} else if (!strcmp(arg, "-nonap")) {
			take_naps = 0;
		} else if (!strcmp(arg, "-sb")) {
			CHECK_ARGC
			screen_blank = atoi(argv[++i]);
		} else if (!strcmp(arg, "-nofbpm")) {
			watch_fbpm = 1;
		} else if (!strcmp(arg, "-fbpm")) {
			watch_fbpm = 0;
		} else if (!strcmp(arg, "-nodpms")) {
			watch_dpms = 1;
		} else if (!strcmp(arg, "-dpms")) {
			watch_dpms = 0;
		} else if (!strcmp(arg, "-xdamage")) {
			use_xdamage = 1;
		} else if (!strcmp(arg, "-noxdamage")) {
			use_xdamage = 0;
		} else if (!strcmp(arg, "-xd_area")) {
			int tn;
			CHECK_ARGC
			tn = atoi(argv[++i]);
			if (tn >= 0) {
				xdamage_max_area = tn;
			}
		} else if (!strcmp(arg, "-xd_mem")) {
			double f;
			CHECK_ARGC
			f = atof(argv[++i]);
			if (f >= 0.0) {
				xdamage_memory = f;
			}
		} else if (!strcmp(arg, "-sigpipe") || !strcmp(arg, "-sig")) {
			CHECK_ARGC
			if (known_sigpipe_mode(argv[++i])) {
				sigpipe = strdup(argv[i]);
			} else {
				fprintf(stderr, "invalid -sigpipe arg: %s, must"
				    " be \"ignore\" or \"exit\"\n", argv[i]);
				exit(1);
			}
#if LIBVNCSERVER_HAVE_LIBPTHREAD
		} else if (!strcmp(arg, "-threads")) {
			use_threads = 1;
		} else if (!strcmp(arg, "-nothreads")) {
			use_threads = 0;
#endif
		} else if (!strcmp(arg, "-fs")) {
			CHECK_ARGC
			fs_frac = atof(argv[++i]);
		} else if (!strcmp(arg, "-gaps")) {
			CHECK_ARGC
			gaps_fill = atoi(argv[++i]);
		} else if (!strcmp(arg, "-grow")) {
			CHECK_ARGC
			grow_fill = atoi(argv[++i]);
		} else if (!strcmp(arg, "-fuzz")) {
			CHECK_ARGC
			tile_fuzz = atoi(argv[++i]);
		} else if (!strcmp(arg, "-debug_tiles")
		    || !strcmp(arg, "-dbt")) {
			debug_tiles++;
		} else if (!strcmp(arg, "-debug_grabs")) {
			debug_grabs++;
		} else if (!strcmp(arg, "-debug_sel")) {
			debug_sel++;
		} else if (!strcmp(arg, "-grab_buster")) {
			grab_buster++;
		} else if (!strcmp(arg, "-nograb_buster")) {
			grab_buster = 0;
		} else if (!strcmp(arg, "-snapfb")) {
			use_snapfb = 1;
		} else if (!strcmp(arg, "-rawfb")) {
			CHECK_ARGC
			raw_fb_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-freqtab")) {
			CHECK_ARGC
			freqtab = strdup(argv[++i]);
		} else if (!strcmp(arg, "-pipeinput")) {
			CHECK_ARGC
			pipeinput_str = strdup(argv[++i]);
		} else if (!strcmp(arg, "-macnodim")) {
			macosx_nodimming = 1;
		} else if (!strcmp(arg, "-macnosleep")) {
			macosx_nosleep = 1;
		} else if (!strcmp(arg, "-macnosaver")) {
			macosx_noscreensaver = 1;
		} else if (!strcmp(arg, "-macnowait")) {
			macosx_wait_for_switch = 0;
		} else if (!strcmp(arg, "-macwheel")) {
			CHECK_ARGC
			macosx_mouse_wheel_speed = atoi(argv[++i]);
		} else if (!strcmp(arg, "-macnoswap")) {
			macosx_swap23 = 0;
		} else if (!strcmp(arg, "-macnoresize")) {
			macosx_resize = 0;
		} else if (!strcmp(arg, "-maciconanim")) {
			CHECK_ARGC
			macosx_icon_anim_time = atoi(argv[++i]);
		} else if (!strcmp(arg, "-macmenu")) {
			macosx_ncache_macmenu = 1;
		} else if (!strcmp(arg, "-gui")) {
			launch_gui = 1;
			if (i < argc-1) {
				char *s = argv[i+1];
				if (*s != '-') {
					gui_str = strdup(s);
					if (strstr(gui_str, "setp")) {
						got_gui_pw = 1;
					}
					i++;
				} 
			}
		} else if (!strcmp(arg, "-remote") || !strcmp(arg, "-R")
		    || !strcmp(arg, "-r") || !strcmp(arg, "-remote-control")) {
			char *str;
			CHECK_ARGC
			i++;
			str = argv[i];
			if (*str == '-') {
				/* accidental leading '-' */
				str++;
			}
			if (!strcmp(str, "ping")) {
				query_cmd = strdup(str);
			} else {
				remote_cmd = strdup(str);
			}
			if (remote_cmd && strchr(remote_cmd, ':') == NULL) {
			    /* interpret -R -scale 3/4 at least */
		 	    if (i < argc-1 && *(argv[i+1]) != '-') {
				int n;

				/* it must be the parameter value */
				i++;
				n = strlen(remote_cmd) + strlen(argv[i]) + 2;

				str = (char *) malloc(n);
				sprintf(str, "%s:%s", remote_cmd, argv[i]);
				free(remote_cmd);
				remote_cmd = str;
			    }
			}
			quiet = 1;
			xkbcompat = 0;
		} else if (!strcmp(arg, "-query") || !strcmp(arg, "-Q")) {
			CHECK_ARGC
			query_cmd = strdup(argv[++i]);
			quiet = 1;
			xkbcompat = 0;
		} else if (!strcmp(arg, "-QD")) {
			CHECK_ARGC
			query_cmd = strdup(argv[++i]);
			query_default = 1;
		} else if (!strcmp(arg, "-sync")) {
			remote_sync = 1;
		} else if (!strcmp(arg, "-nosync")) {
			remote_sync = 0;
		} else if (!strcmp(arg, "-noremote")) {
			accept_remote_cmds = 0;
		} else if (!strcmp(arg, "-yesremote")) {
			accept_remote_cmds = 1;
		} else if (!strcmp(arg, "-unsafe")) {
			safe_remote_only = 0;
		} else if (!strcmp(arg, "-privremote")) {
			priv_remote = 1;
		} else if (!strcmp(arg, "-safer")) {
			more_safe = 1;
		} else if (!strcmp(arg, "-nocmds")) {
			no_external_cmds = 1;
		} else if (!strcmp(arg, "-allowedcmds")) {
			CHECK_ARGC
			allowed_external_cmds = strdup(argv[++i]);
		} else if (!strcmp(arg, "-deny_all")) {
			deny_all = 1;
		} else if (!strcmp(arg, "-httpdir")) {
			CHECK_ARGC
			http_dir = strdup(argv[++i]);
			got_httpdir = 1;
		} else {
			if (!strcmp(arg, "-desktop") && i < argc-1) {
				dt = 1;
				rfb_desktop_name = strdup(argv[i+1]);
			}
			if (!strcmp(arg, "-passwd")) {
				pw_loc = i;
				got_passwd = 1;
			}
			if (!strcmp(arg, "-rfbauth")) {
				got_rfbauth = 1;
			}
			if (!strcmp(arg, "-rfbwait")) {
				got_rfbwait = 1;
			}
			if (!strcmp(arg, "-deferupdate")) {
				got_deferupdate = 1;
			}
			if (!strcmp(arg, "-rfbport") && i < argc-1) {
				got_rfbport = 1;
				got_rfbport_val = atoi(argv[i+1]);
			}
			if (!strcmp(arg, "-alwaysshared ")) {
				got_alwaysshared = 1;
			}
			if (!strcmp(arg, "-nevershared")) {
				got_nevershared = 1;
			}
			if (!strcmp(arg, "-listen") && i < argc-1) {
				listen_str = strdup(argv[i+1]);
			}
			/* otherwise copy it for libvncserver use below. */
			if (!strcmp(arg, "-ultrafilexfer") ||
			    !strcmp(arg, "-ultravncfilexfer")) {
				if (argc_vnc + 2 < argc_vnc_max) {
					argv_vnc[argc_vnc++] = strdup("-rfbversion");
					argv_vnc[argc_vnc++] = strdup("3.6");
					argv_vnc[argc_vnc++] = strdup("-permitfiletransfer");
				}
			} else if (argc_vnc < argc_vnc_max) {
				argv_vnc[argc_vnc++] = strdup(arg);
			} else {
				rfbLog("too many arguments.\n");
				exit(1);
			}
		}
	}


	if (getenv("X11VNC_LOOP_MODE")) {
		if (bg) {
			if (! quiet) {
				fprintf(stderr, "disabling -bg in -loop "
				    "mode\n");
			}
			bg = 0;
		}
		if (inetd) {
			if (! quiet) {
				fprintf(stderr, "disabling -inetd in -loop "
				    "mode\n");
			}
			inetd = 0;
		}
	}

	if (launch_gui && (query_cmd || remote_cmd)) {
		launch_gui = 0;
		gui_str = NULL;
	}
	if (more_safe) {
		launch_gui = 0;
	}
	if (launch_gui) {
		int sleep = 0;
		if (SHOW_NO_PASSWORD_WARNING && !nopw) {
			sleep = 1;
		}
#ifdef MACOSX
		if (! use_dpy && getenv("DISPLAY") == NULL) {
			/* we need this for gui since no X properties */
			if (! client_connect_file && ! client_connect) {
				int fd;
				char tmp[] = "/tmp/x11vnc-macosx-channel.XXXXXX";
				fd = mkstemp(tmp);
				if (fd >= 0) {
					close(fd);
					client_connect_file = strdup(tmp);
					rfbLog("MacOS X: set -connect file to %s\n", client_connect_file);
				}
			}
		}
#endif
		do_gui(gui_str, sleep);
	}
	if (logfile) {
		int n;
		if (logfile_append) {
			n = open(logfile, O_WRONLY|O_CREAT|O_APPEND, 0666);
		} else {
			n = open(logfile, O_WRONLY|O_CREAT|O_TRUNC, 0666);
		}
		if (n < 0) {
			fprintf(stderr, "error opening logfile: %s\n", logfile);
			perror("open");
			exit(1);
		}
		if (dup2(n, 2) < 0) {
			fprintf(stderr, "dup2 failed\n");
			perror("dup2");
			exit(1);
		}
		if (n > 2) {
			close(n);
		}
	}
	if (inetd && quiet && !logfile) {
		int n;
		/*
		 * Redir stderr to /dev/null under -inetd and -quiet
		 * but no -o logfile.  Typical problem:
		 *   Xlib:  extension "RECORD" missing on display ":1.0".
		 * If they want this info, they should use -o logfile,
		 * or no -q and 2>logfile.
		 */
		n = open("/dev/null", O_WRONLY);
		if (n >= 0) {
			if (dup2(n, 2) >= 0) {
				if (n > 2) {
					close(n);
				}
			}
		}
	}
	if (! quiet && ! inetd) {
		int i;
		for (i=1; i < argc_vnc; i++) {
			rfbLog("passing arg to libvncserver: %s\n", argv_vnc[i]);
			if (!strcmp(argv_vnc[i], "-passwd")) {
				i++;
			}
		}
	}

	if (remote_cmd || query_cmd) {
		/*
		 * no need to open DISPLAY, just write it to the file now
		 * similar for query_default.
		 */
		if (client_connect_file || query_default) {
			int rc = do_remote_query(remote_cmd, query_cmd,
			     remote_sync, query_default);
			fflush(stderr);
			fflush(stdout);
			exit(rc);
		}
	}

	if (usepw && ! got_rfbauth && ! got_passwd && ! got_passwdfile && !unixpw) {
		char *f, *h = getenv("HOME");
		struct stat sbuf;
		int found = 0, set_rfbauth = 0;

		if (!h) {
			rfbLog("HOME unset in -usepw mode.\n");
			exit(1);
		}
		f = (char *) malloc(strlen(h)+strlen("/.vnc/passwdfile") + 1);

		sprintf(f, "%s/.vnc/passwd", h);
		if (stat(f, &sbuf) == 0) {
			found = 1;
			if (! quiet) {
				rfbLog("-usepw: found %s\n", f);
			}
			got_rfbauth = 1;
			set_rfbauth = 1;
		}

		sprintf(f, "%s/.vnc/passwdfile", h);
		if (! found && stat(f, &sbuf) == 0) {
			found = 1;
			if (! quiet) {
				rfbLog("-usepw: found %s\n", f);
			}
			got_passwdfile = 1;
			passwdfile = strdup(f);
		}

#if LIBVNCSERVER_HAVE_FORK
#if LIBVNCSERVER_HAVE_SYS_WAIT_H
#if LIBVNCSERVER_HAVE_WAITPID
		if (! found) {
			pid_t pid = fork();
			if (pid < 0) {
				;
			} else if (pid == 0) {
				execlp(argv[0], argv[0], "-storepasswd",
				    (char *) NULL);
				exit(1);
			} else {
				int s;
				waitpid(pid, &s, 0); 
				if (WIFEXITED(s) && WEXITSTATUS(s) == 0) {
					got_rfbauth = 1;
					set_rfbauth = 1;
					found = 1;
				}
			}
		}
#endif
#endif
#endif

		if (set_rfbauth) {
			sprintf(f, "%s/.vnc/passwd", h);
			if (argc_vnc < 100) {
				argv_vnc[argc_vnc++] = strdup("-rfbauth");
			} else {
				exit(1);
			}
			if (argc_vnc < 100) {
				argv_vnc[argc_vnc++] = strdup(f);
			} else {
				exit(1);
			}
		}
		if (! found) {
			fprintf(stderr, "x11vnc -usepw: could not find"
			    " a password to use.\n");
			exit(1);
		}
		free(f);
	}

	if (got_rfbauth && (got_passwd || got_viewpasswd || got_passwdfile)) {
		fprintf(stderr, "option -rfbauth is incompatible with:\n");
		fprintf(stderr, "            -passwd, -viewpasswd, and -passwdfile\n");
		exit(1);
	}
	if (got_passwdfile && (got_passwd || got_viewpasswd)) {
		fprintf(stderr, "option -passwdfile is incompatible with:\n");
		fprintf(stderr, "            -passwd and -viewpasswd\n");
		exit(1);
	}

	/*
	 * If -passwd was used, clear it out of argv.  This does not
	 * work on all UNIX, have to use execvp() in general...
	 */
	if (pw_loc > 0) {
		int i;
		for (i=pw_loc; i <= pw_loc+1; i++) {
			if (i < argc) {
				char *p = argv[i];		
				strzero(p);
			}
		}
	} else if (passwdfile) {
		/* read passwd(s) from file */
		if (strstr(passwdfile, "cmd:") == passwdfile ||
		    strstr(passwdfile, "custom:") == passwdfile) {
			char tstr[100], *q;
			sprintf(tstr, "%f", dnow());
			if ((q = strrchr(tstr, '.')) == NULL) {
				q = tstr;
			} else {
				q++;
			}
			/* never used under cmd:, used to force auth */
			argv_vnc[argc_vnc++] = strdup("-passwd");
			argv_vnc[argc_vnc++] = strdup(q);
		} else if (read_passwds(passwdfile)) {
			argv_vnc[argc_vnc++] = strdup("-passwd");
			argv_vnc[argc_vnc++] = strdup(passwd_list[0]);
		}
		got_passwd = 1;
		pw_loc = 100;	/* just for pw_loc check below */
	}
	if (vpw_loc > 0) {
		int i;
		for (i=vpw_loc; i <= vpw_loc+1; i++) {
			if (i < argc) {
				char *p = argv[i];		
				strzero(p);
			}
		}
	} 
#ifdef HARDWIRE_PASSWD
	if (!got_rfbauth && !got_passwd) {
		argv_vnc[argc_vnc++] = strdup("-passwd");
		argv_vnc[argc_vnc++] = strdup(HARDWIRE_PASSWD);
		got_passwd = 1;
		pw_loc = 100;
	}
#endif
#ifdef HARDWIRE_VIEWPASSWD
	if (!got_rfbauth && got_passwd && !viewonly_passwd && !passwd_list) {
		viewonly_passwd = strdup(HARDWIRE_VIEWPASSWD);
	}
#endif
	if (viewonly_passwd && pw_loc < 0) {
		rfbLog("-passwd must be supplied when using -viewpasswd\n");
		exit(1);
	}

	if (SHOW_NO_PASSWORD_WARNING) {
		char message[] = "-rfbauth, -passwdfile, -passwd password, "
		    "or -unixpw required.";
		if (! nopw) {
			nopassword_warning_msg(got_localhost);
		}
#if PASSWD_REQUIRED
		rfbLog("%s\n", message);
		exit(1);
#endif
#if PASSWD_UNLESS_NOPW
		if (! nopw) {
			rfbLog("%s\n", message);
			exit(1);
		}
#endif
		message[0] = '\0';	/* avoid compiler warning */
	}

	if (more_safe) {
		if (! quiet) {
			rfbLog("-safer mode:\n");
			rfbLog("   vnc_connect=0\n");
			rfbLog("   accept_remote_cmds=0\n");
			rfbLog("   safe_remote_only=1\n");
			rfbLog("   launch_gui=0\n");
		}
		vnc_connect = 0;
		accept_remote_cmds = 0;
		safe_remote_only = 1;
		launch_gui = 0;
	}

	if (unixpw) {
		if (inetd) {
			use_stunnel = 0;
		}
		if (! use_stunnel && ! use_openssl) {
			if (have_ssh_env()) {
				char *s = getenv("SSH_CONNECTION");
				if (! s) s = getenv("SSH_CLIENT");
				if (! s) s = "SSH_CONNECTION";
				fprintf(stderr, "\n");
				rfbLog("Skipping -ssl/-stunnel contraint in"
				    " -unixpw\n");
				rfbLog("mode, assuming your SSH encryption"
				    " is: %s\n", s);
				rfbLog("Setting -localhost in SSH + -unixpw"
				    " mode.\n");
				fprintf(stderr, "\n");
				allow_list = strdup("127.0.0.1");
				got_localhost = 1;
				if (! nopw) {
					usleep(2000*1000);
				}
			} else if (getenv("UNIXPW_DISABLE_SSL")) {
				rfbLog("Skipping -ssl/-stunnel requirement"
				    " due to\n");
				rfbLog("UNIXPW_DISABLE_SSL setting.\n");
			} else {
				if (openssl_present()) {
					rfbLog("set -ssl in -unixpw mode.\n");
					use_openssl = 1;
				} else if (inetd) {
					rfbLog("could not set -ssl in -inetd"
					    " + -unixpw mode.\n");
					exit(1);
				} else {
					rfbLog("set -stunnel in -unixpw mode.\n");
					use_stunnel = 1;
				}
			}
		}
		if (use_threads) {
			if (! quiet) {
				rfbLog("disabling -threads under -unixpw\n");
			}
			use_threads = 0;
		}
	}
	if (use_stunnel && ! got_localhost) {
		if (! getenv("STUNNEL_DISABLE_LOCALHOST") &&
		    ! getenv("UNIXPW_DISABLE_LOCALHOST")) {
			if (! quiet) {
				rfbLog("Setting -localhost in -stunnel mode.\n");
			}
			allow_list = strdup("127.0.0.1");
			got_localhost = 1;
		}
	}
	if (ssl_verify && ! use_stunnel && ! use_openssl) {
		rfbLog("-sslverify must be used with -ssl or -stunnel\n");
		exit(1);
	}
	if (https_port_num >= 0 && ! use_openssl) {
		rfbLog("-https must be used with -ssl\n");
		exit(1);
	}

	/* fixup settings that do not make sense */
		
	if (use_threads && nofb && cursor_pos_updates) {
		if (! quiet) {
			rfbLog("disabling -threads under -nofb -cursorpos\n");
		}
		use_threads = 0;
	}
	if (tile_fuzz < 1) {
		tile_fuzz = 1;
	}
	if (waitms < 0) {
		waitms = 0;
	}

	if (alpha_threshold < 0) {
		alpha_threshold = 0;
	}
	if (alpha_threshold > 256) {
		alpha_threshold = 256;
	}
	if (alpha_frac < 0.0) {
		alpha_frac = 0.0;
	}
	if (alpha_frac > 1.0) {
		alpha_frac = 1.0;
	}
	if (alpha_blend) {
		alpha_remove = 0;
	}

	if (cmap8to24 && overlay) {
		if (! quiet) {
			rfbLog("disabling -overlay in -8to24 mode.\n");
		}
		overlay = 0;
	}

	if (filexfer && view_only) {
		if (! quiet) {
			rfbLog("setting -nofilexfer in -viewonly mode.\n");
		}
		/* how to undo via -R? */
		filexfer = 0;
	}

	if (inetd) {
		shared = 0;
		connect_once = 1;
		bg = 0;
		if (use_stunnel) {
			exit(1);
		}
	}

	if (flip_byte_order && using_shm && ! quiet) {
		rfbLog("warning: -flipbyte order only works with -noshm\n");
	}

	if (! wireframe_copyrect) {
		set_wirecopyrect_mode(NULL);
	}
	if (! scroll_copyrect) {
		set_scrollcopyrect_mode(NULL);
	}
	if (screen_fixup_str) {
		parse_fixscreen();
	}
	initialize_scroll_matches();
	initialize_scroll_term();
	initialize_max_keyrepeat();

	/* increase rfbwait if threaded */
	if (use_threads && ! got_rfbwait) {
		rfbMaxClientWait = 604800000;
	}

	/* no framebuffer (Win2VNC) mode */

	if (nofb) {
		/* disable things that do not make sense with no fb */
		set_nofb_params(0);

		if (! got_deferupdate && ! got_defer) {
			/* reduce defer time under -nofb */
			defer_update = defer_update_nofb;
		}
		if (got_pointer_mode < 0) {
			pointer_mode = POINTER_MODE_NOFB;
		}
	}

	if (ncache < 0) {
		ncache_beta_tester = 1;
		ncache = -ncache;
	}

	if (raw_fb_str) {
		set_raw_fb_params(0);
	}
	if (! got_deferupdate) {
		char tmp[40];
		sprintf(tmp, "%d", defer_update);
		argv_vnc[argc_vnc++] = strdup("-deferupdate");
		argv_vnc[argc_vnc++] = strdup(tmp);
	}

	if (debug_pointer || debug_keyboard) {
		if (bg || quiet) {
			rfbLog("disabling -bg/-q under -debug_pointer"
			    "/-debug_keyboard\n");
			bg = 0;
			quiet = 0;
		}
	}

	/* initialize added_keysyms[] array to zeros */
	add_keysym(NoSymbol);

	/* tie together cases of -localhost vs. -listen localhost */
	if (! listen_str) {
		if (allow_list && !strcmp(allow_list, "127.0.0.1")) {
			listen_str = strdup("localhost");
			argv_vnc[argc_vnc++] = strdup("-listen");
			argv_vnc[argc_vnc++] = strdup(listen_str);
		}
	} else if (!strcmp(listen_str, "localhost") ||
	    !strcmp(listen_str, "127.0.0.1")) {
		allow_list = strdup("127.0.0.1");
	}

	/* set OS struct UT */
	uname(&UT);

	initialize_crash_handler();

	if (! quiet) {
		if (verbose) {
			print_settings(try_http, bg, gui_str);
		}
		rfbLog("x11vnc version: %s\n", lastmod);
	} else {
		rfbLogEnable(0);
	}

	X_INIT;
	SCR_INIT;
	
	/* open the X display: */
	if (auth_file) {
		set_env("XAUTHORITY", auth_file);
	}
#if LIBVNCSERVER_HAVE_XKEYBOARD
	/*
	 * Disable XKEYBOARD before calling XOpenDisplay()
	 * this should be used if there is ambiguity in the keymapping. 
	 */
	if (xkbcompat) {
		Bool rc = XkbIgnoreExtension(True);
		if (! quiet) {
			rfbLog("Disabling xkb XKEYBOARD extension. rc=%d\n",
			    rc);
		}
		if (watch_bell) {
			watch_bell = 0;
			if (! quiet) rfbLog("Disabling bell.\n");
		}
	}
#else
	watch_bell = 0;
	use_xkb_modtweak = 0;
#endif

#ifdef LIBVNCSERVER_WITH_TIGHTVNC_FILETRANSFER
	if (filexfer) {
		rfbRegisterTightVNCFileTransferExtension();
	} else {
		rfbUnregisterTightVNCFileTransferExtension();
	}
#endif

	initialize_allowed_input();

	if (users_list && strstr(users_list, "lurk=")) {
		if (use_dpy) {
			rfbLog("warning: -display does not make sense in "
			    "\"lurk=\" mode...\n");
		}
		lurk_loop(users_list);

	} else if (use_dpy && strstr(use_dpy, "WAIT:") == use_dpy) {
		char *mcm = multiple_cursors_mode;

		waited_for_client = wait_for_client(&argc_vnc, argv_vnc,
		    try_http && ! got_httpdir);

		if (!mcm && multiple_cursors_mode) {
			free(multiple_cursors_mode);
			multiple_cursors_mode = NULL;
		}
	}

	if (use_dpy) {
		dpy = XOpenDisplay_wr(use_dpy);
	} else if ( (use_dpy = getenv("DISPLAY")) ) {
		dpy = XOpenDisplay_wr(use_dpy);
	} else {
		dpy = XOpenDisplay_wr("");
	}

#ifdef MACOSX
	if (! dpy && ! raw_fb_str) {
		raw_fb_str = strdup("console");
	}
#endif

	if (! dpy && raw_fb_str) {
		rfbLog("continuing without X display in -rawfb mode, "
		    "hold on tight..\n");
		goto raw_fb_pass_go_and_collect_200_dollars;
	}

	if (! dpy && ! use_dpy && ! getenv("DISPLAY")) {
		int i, s = 4;
		rfbLogEnable(1);
		rfbLog("\a\n");
		rfbLog("*** XOpenDisplay failed. No -display or DISPLAY.\n");
		rfbLog("*** Trying \":0\" in %d seconds.  Press Ctrl-C to"
		    " abort.\n", s);
		rfbLog("*** ");
		for (i=1; i<=s; i++)  {
			fprintf(stderr, "%d ", i);
			sleep(1);
		}
		fprintf(stderr, "\n");
		use_dpy = ":0";
		dpy = XOpenDisplay_wr(use_dpy);
		if (dpy) {
			rfbLog("*** XOpenDisplay of \":0\" successful.\n");
		}
		rfbLog("\n");
		if (quiet) rfbLogEnable(0);
	}

	if (! dpy) {
		char *d = use_dpy;
		if (!d) d = getenv("DISPLAY");
		if (!d) d = "null";
		rfbLogEnable(1);
		fprintf(stderr, "\n");
		rfbLog("***************************************\n", d);
		rfbLog("*** XOpenDisplay failed (%s)\n", d);
		xopen_display_fail_message(d);
		exit(1);
	} else if (use_dpy) {
		if (! quiet) rfbLog("Using X display %s\n", use_dpy);
	} else {
		if (! quiet) rfbLog("Using default X display.\n");
	}

	scr = DefaultScreen(dpy);
	rootwin = RootWindow(dpy, scr);

	if (! quiet && ! raw_fb_str) {
		rfbLog("\n");
		rfbLog("------------------ USEFUL INFORMATION ------------------\n");
	}

	if (remote_cmd || query_cmd) {
		int rc = do_remote_query(remote_cmd, query_cmd, remote_sync,
		    query_default);
		XFlush_wr(dpy);
		fflush(stderr);
		fflush(stdout);
		usleep(30 * 1000);	/* still needed? */
		XCloseDisplay_wr(dpy);
		exit(rc);
	}

	if (priv_remote) {
		if (! remote_control_access_ok()) {
			rfbLog("** Disabling remote commands in -privremote mode.\n");
			accept_remote_cmds = 0;
		}
	}

	sync_tod_with_servertime();
	if (grab_buster) {
		spawn_grab_buster();
	}

#if LIBVNCSERVER_HAVE_LIBXFIXES
	if (! XFixesQueryExtension(dpy, &xfixes_base_event_type, &er)) {
		if (! quiet && ! raw_fb_str) {
			rfbLog("Disabling XFIXES mode: display does not support it.\n");
		}
		xfixes_base_event_type = 0;
		xfixes_present = 0;
	} else {
		xfixes_present = 1;
	}
#endif
	if (! xfixes_present) {
		use_xfixes = 0;
	}

#if LIBVNCSERVER_HAVE_LIBXDAMAGE
	if (! XDamageQueryExtension(dpy, &xdamage_base_event_type, &er)) {
		if (! quiet && ! raw_fb_str) {
			rfbLog("Disabling X DAMAGE mode: display does not support it.\n");
		}
		xdamage_base_event_type = 0;
		xdamage_present = 0;
	} else {
		xdamage_present = 1;
	}
#endif
	if (! xdamage_present) {
		use_xdamage = 0;
	}
	if (! quiet && xdamage_present && use_xdamage && ! raw_fb_str) {
		rfbLog("X DAMAGE available on display, using it for polling hints.\n");
		rfbLog("  To disable this behavior use: '-noxdamage'\n");
	}

	if (! quiet && wireframe && ! raw_fb_str) {
		rfbLog("\n");
		rfbLog("Wireframing: -wireframe mode is in effect for window moves.\n");
		rfbLog("  If this yields undesired behavior (poor response, painting\n");
		rfbLog("  errors, etc) it may be disabled:\n");
		rfbLog("   - use '-nowf' to disable wireframing completely.\n");
		rfbLog("   - use '-nowcr' to disable the Copy Rectangle after the\n");
		rfbLog("     moved window is released in the new position.\n");
		rfbLog("  Also see the -help entry for tuning parameters.\n");
		rfbLog("  You can press 3 Alt_L's (Left \"Alt\" key) in a row to \n");
		rfbLog("  repaint the screen, also see the -fixscreen option for\n");
		rfbLog("  periodic repaints.\n");
		if (scale_str && !strstr(scale_str, "nocr")) {
			rfbLog("  Note: '-scale' is on and this can cause more problems.\n");
		}
	}

	overlay_present = 0;
#if defined(SOLARIS_OVERLAY) && !NO_X11
	if (! XQueryExtension(dpy, "SUN_OVL", &maj, &ev, &er)) {
		if (! quiet && overlay && ! raw_fb_str) {
			rfbLog("Disabling -overlay: SUN_OVL extension not available.\n");
		}
	} else {
		overlay_present = 1;
	}
#endif
#if defined(IRIX_OVERLAY) && !NO_X11
	if (! XReadDisplayQueryExtension(dpy, &ev, &er)) {
		if (! quiet && overlay && ! raw_fb_str) {
			rfbLog("Disabling -overlay: IRIX ReadDisplay extension not available.\n");
		}
	} else {
		overlay_present = 1;
	}
#endif
	if (overlay && !overlay_present) {
		overlay = 0;
		overlay_cursor = 0;
	}

	/* cursor shapes setup */
	if (! multiple_cursors_mode) {
		multiple_cursors_mode = strdup("default");
	}
	if (show_cursor) {
		if(!strcmp(multiple_cursors_mode, "default")
		    && xfixes_present && use_xfixes) {
			free(multiple_cursors_mode);
			multiple_cursors_mode = strdup("most");

			if (! quiet && ! raw_fb_str) {
				rfbLog("\n");
				rfbLog("XFIXES available on display, resetting cursor mode\n");
				rfbLog("  to: '-cursor most'.\n");
				rfbLog("  to disable this behavior use: '-cursor arrow'\n");
				rfbLog("  or '-noxfixes'.\n");
			}
		}
		if(!strcmp(multiple_cursors_mode, "most")) {
			if (xfixes_present && use_xfixes &&
			    overlay_cursor == 1) {
				if (! quiet && ! raw_fb_str) {
					rfbLog("using XFIXES for cursor drawing.\n");
				}
				overlay_cursor = 0;
			}
		}
	}

	if (overlay) {
		using_shm = 0;
		if (flash_cmap && ! quiet && ! raw_fb_str) {
			rfbLog("warning: -flashcmap may be incompatible with -overlay\n");
		}
		if (show_cursor && overlay_cursor) {
			char *s = multiple_cursors_mode;
			if (*s == 'X' || !strcmp(s, "some") ||
			    !strcmp(s, "arrow")) {
				/*
				 * user wants these modes, so disable fb cursor
				 */
				overlay_cursor = 0;
			} else {
				/*
				 * "default" and "most", we turn off
				 * show_cursor since it will automatically
				 * be in the framebuffer.
				 */
				show_cursor = 0;
			}
		}
	}

	initialize_cursors_mode();

	/* check for XTEST */
	if (! XTestQueryExtension_wr(dpy, &ev, &er, &maj, &min)) {
		if (! quiet && ! raw_fb_str) {
			rfbLog("\n");
			rfbLog("WARNING: XTEST extension not available (either missing from\n");
			rfbLog("  display or client library libXtst missing at build time).\n");
			rfbLog("  MOST user input (pointer and keyboard) will be DISCARDED.\n");
			rfbLog("  If display does have XTEST, be sure to build x11vnc with\n");
			rfbLog("  a working libXtst build environment (e.g. libxtst-dev,\n");
			rfbLog("  or other packages).\n");
			rfbLog("No XTEST extension, switching to -xwarppointer mode for\n");
			rfbLog("  pointer motion input.\n");
		}
		xtest_present = 0;
		use_xwarppointer = 1;
	} else {
		xtest_present = 1;
		xtest_base_event_type = ev;
		if (maj <= 1 || (maj == 2 && min <= 2)) {
			/* no events defined as of 2.2 */
			xtest_base_event_type = 0;
		}
	}

	if (! XETrapQueryExtension_wr(dpy, &ev, &er, &maj)) {
		xtrap_present = 0;
	} else {
		xtrap_present = 1;
		xtrap_base_event_type = ev;
	}

	/*
	 * Window managers will often grab the display during resize,
	 * etc, using XGrabServer().  To avoid deadlock (our user resize
	 * input is not processed) we tell the server to process our
	 * requests during all grabs:
	 */
	disable_grabserver(dpy, 0);

	/* check for RECORD */
	if (! XRecordQueryVersion_wr(dpy, &maj, &min)) {
		xrecord_present = 0;
		if (! quiet) {
			rfbLog("\n");
			rfbLog("The RECORD X extension was not found on the display.\n");
			rfbLog("If your system has disabled it by default, you can\n");
			rfbLog("enable it to get a nice x11vnc performance speedup\n");
			rfbLog("for scrolling by putting this into the \"Module\" section\n");
			rfbLog("of /etc/X11/xorg.conf or /etc/X11/XF86Config:\n");
			rfbLog("\n");
			rfbLog("  Section \"Module\"\n");
			rfbLog("  ...\n");
			rfbLog("      Load    \"record\"\n");
			rfbLog("  ...\n");
			rfbLog("  EndSection\n");
			rfbLog("\n");
		}
	} else {
		xrecord_present = 1;
	}

	initialize_xrecord();

	tmpi = 1;
	if (scroll_copyrect) {
		if (strstr(scroll_copyrect, "never")) {
			tmpi = 0;
		}
	} else if (scroll_copyrect_default) {
		if (strstr(scroll_copyrect_default, "never")) {
			tmpi = 0;
		}
	}
	if (! xrecord_present) {
		tmpi = 0;
	}
#if !LIBVNCSERVER_HAVE_RECORD
	tmpi = 0;
#endif
	if (! quiet && tmpi && ! raw_fb_str) {
		rfbLog("\n");
		rfbLog("Scroll Detection: -scrollcopyrect mode is in effect to\n");
		rfbLog("  use RECORD extension to try to detect scrolling windows\n");
		rfbLog("  (induced by either user keystroke or mouse input).\n");
		rfbLog("  If this yields undesired behavior (poor response, painting\n");
		rfbLog("  errors, etc) it may be disabled via: '-noscr'\n");
		rfbLog("  Also see the -help entry for tuning parameters.\n");
		rfbLog("  You can press 3 Alt_L's (Left \"Alt\" key) in a row to \n");
		rfbLog("  repaint the screen, also see the -fixscreen option for\n");
		rfbLog("  periodic repaints.\n");
		if (scale_str && !strstr(scale_str, "nocr")) {
			rfbLog("  Note: '-scale' is on and this can cause more problems.\n");
		}
	}

	if (! quiet && ncache && ! raw_fb_str) {
		rfbLog("\n");
		rfbLog("Client Side Caching: -ncache mode is in effect to provide\n");
		rfbLog("  client-side pixel data caching.  This speeds up\n");
		rfbLog("  iconifying/deiconifying windows, moving and raising\n");
		rfbLog("  windows, and reposting menus.  In the simple CopyRect\n");
		rfbLog("  encoding scheme used (no compression) a huge amount\n");
		rfbLog("  of extra memory (20-80MB) is used on both the server and\n");
		rfbLog("  client sides.  This mode works with any VNC viewer.\n");
		rfbLog("  However, in most you can actually see the cached pixel\n");
		rfbLog("  data by scrolling down, so you need to re-adjust its size.\n");
		rfbLog("  See http://www.karlrunge.com/x11vnc/#faq-client-caching.\n");
		rfbLog("  If this mode yields undesired behavior (poor response,\n");
		rfbLog("  painting errors, etc) it may be disabled via: '-ncache 0'\n");
		rfbLog("  You can press 3 Alt_L's (Left \"Alt\" key) in a row to \n");
		rfbLog("  repaint the screen, also see the -fixscreen option for\n");
		rfbLog("  periodic repaints.\n");
		if (scale_str) {
			rfbLog("  Note: '-scale' is on and this can cause more problems.\n");
		}
	}

	/* check for OS with small shm limits */
	if (using_shm && ! single_copytile) {
		if (limit_shm()) {
			single_copytile = 1;
		}
	}

	single_copytile_orig = single_copytile;

	/* check for MIT-SHM */
	if (! XShmQueryExtension_wr(dpy)) {
		xshm_present = 0;
		if (! using_shm) {
			if (! quiet && ! raw_fb_str) {
				rfbLog("info: display does not support XShm.\n");
			}
		} else {
		    if (! quiet && ! raw_fb_str) {
			rfbLog("\n");
			rfbLog("warning: XShm extension is not available.\n");
			rfbLog("For best performance the X Display should be local. (i.e.\n");
			rfbLog("the x11vnc and X server processes should be running on\n");
			rfbLog("the same machine.)\n");
#if LIBVNCSERVER_HAVE_XSHM
			rfbLog("Restart with -noshm to override this.\n");
		    }
		    exit(1);
#else
			rfbLog("Switching to -noshm mode.\n");
		    }
		    using_shm = 0;
#endif
		}
	}

#if LIBVNCSERVER_HAVE_XKEYBOARD
	/* check for XKEYBOARD */
	initialize_xkb();
	initialize_watch_bell();
	if (!xkb_present && use_xkb_modtweak) {
		if (! quiet && ! raw_fb_str) {
			rfbLog("warning: disabling xkb modtweak. XKEYBOARD ext. not present.\n");
		}
		use_xkb_modtweak = 0;
	}
#endif

	if (xkb_present && !use_xkb_modtweak && !got_noxkb) {
		if (use_modifier_tweak) {
			switch_to_xkb_if_better();
		}
	}

#if LIBVNCSERVER_HAVE_LIBXRANDR
	if (! XRRQueryExtension(dpy, &xrandr_base_event_type, &er)) {
		if (xrandr && ! quiet && ! raw_fb_str) {
			rfbLog("Disabling -xrandr mode: display does not support X RANDR.\n");
		}
		xrandr_base_event_type = 0;
		xrandr = 0;
		xrandr_present = 0;
	} else {
		xrandr_present = 1;
	}
#endif

	check_pm();

	if (! quiet && ! raw_fb_str) {
		rfbLog("--------------------------------------------------------\n");
		rfbLog("\n");
	}

	raw_fb_pass_go_and_collect_200_dollars:

#ifdef MACOSX
	if (! dpy) {
		/* XXX this needs improvement (esp. for remote control) */
		if (! raw_fb_str || strstr(raw_fb_str, "console") == raw_fb_str) {
			if (! multiple_cursors_mode) {
				multiple_cursors_mode = strdup("most");
			}
			initialize_cursors_mode();
			if (use_xdamage) {
				xdamage_present = 1;
				initialize_xdamage();
			}
		}
	}
#endif

	if (! dt) {
		static char str[] = "-desktop";
		argv_vnc[argc_vnc++] = str;
		argv_vnc[argc_vnc++] = choose_title(use_dpy);
		rfb_desktop_name = strdup(argv_vnc[argc_vnc-1]);
	}
	
	/*
	 * Create the XImage corresponding to the display framebuffer.
	 */

	fb0 = initialize_xdisplay_fb();

	/*
	 * In some cases (UINPUT touchscreens) we need the dpy_x dpy_y
	 * to initialize pipeinput. So we do it after fb is created.
	 */
	initialize_pipeinput();

	/*
	 * n.b. we do not have to X_LOCK any X11 calls until watch_loop()
	 * is called since we are single-threaded until then.
	 */

	initialize_screen(&argc_vnc, argv_vnc, fb0);

	if (waited_for_client) {
		if (fake_fb) {
			free(fake_fb);
			fake_fb = NULL;
		}
		if (use_solid_bg && client_count) {
			solid_bg(0);
		}
		if (accept_cmd && strstr(accept_cmd, "popup") == accept_cmd) {
			rfbClientIteratorPtr iter;
			rfbClientPtr cl, cl0 = NULL;
			int i = 0;
			iter = rfbGetClientIterator(screen);
			while( (cl = rfbClientIteratorNext(iter)) ) {
				i++;	
				if (i != 1) {
					rfbLog("WAIT popup: too many clients\n");
					clean_up_exit(1);
				}
				cl0 = cl;
			}
			rfbReleaseClientIterator(iter);
			if (i != 1 || cl0 == NULL) {
				rfbLog("WAIT popup: no clients.\n");
				clean_up_exit(1);
			}
			if (! accept_client(cl0)) {
				rfbLog("WAIT popup: denied.\n");
				clean_up_exit(1);
			}
			rfbLog("waited_for_client: popup accepted.\n");
			cl0->onHold = FALSE;
		}
		if (macosx_console) {
			refresh_screen(1);
		}
	}

	if (! waited_for_client) {
		if (try_http && ! got_httpdir && check_httpdir()) {
			http_connections(1);
		}
	}

	initialize_tiles();

	/* rectangular blackout regions */
	initialize_blackouts_and_xinerama();

	/* created shm or XImages when using_shm = 0 */
	initialize_polling_images();

	initialize_signals();

	initialize_speeds();

	initialize_keyboard_and_pointer();

	if (inetd && use_openssl) {
		if (! waited_for_client) {
			accept_openssl(OPENSSL_INETD);
		}
	}
	if (! inetd && ! use_openssl) {
		if (! screen->port || screen->listenSock < 0) {
			if (got_rfbport && got_rfbport_val == 0) {
				;
			} else {
				rfbLogEnable(1);
				rfbLog("Error: could not obtain listening port.\n");
				clean_up_exit(1);
			}
		}
	}
	if (! quiet) {
		rfbLog("screen setup finished.\n");
		if (SHOW_NO_PASSWORD_WARNING && !nopw) {
			rfbLog("\n");
			rfbLog("WARNING: You are running x11vnc WITHOUT"
			    " a password.  See\n");
			rfbLog("WARNING: the warning message printed above"
			    " for more info.\n");
		}
	}
	set_vnc_desktop_name();

	if (ncache_beta_tester) {
		ncache_beta_tester_message();
	}

#if LIBVNCSERVER_HAVE_FORK && LIBVNCSERVER_HAVE_SETSID
	if (bg) {
		/* fork into the background now */
		int p, n;
		if ((p = fork()) > 0)  {
			exit(0);
		} else if (p == -1) {
			rfbLogEnable(1);
			fprintf(stderr, "could not fork\n");
			perror("fork");
			clean_up_exit(1);
		}
		if (setsid() == -1) {
			rfbLogEnable(1);
			fprintf(stderr, "setsid failed\n");
			perror("setsid");
			clean_up_exit(1);
		}
		/* adjust our stdio */
		n = open("/dev/null", O_RDONLY);
		dup2(n, 0);
		dup2(n, 1);
		if (! logfile) {
			dup2(n, 2);
		}
		if (n > 2) {
			close(n);
		}
	}
#endif

	watch_loop();

	return(0);

#undef argc
#undef argv

}