pinentry.c
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pinentry.c
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	/* pinentry.c - The PIN entry support library
	* Copyright (C) 2002, 2003, 2007, 2008, 2010, 2015, 2016 g10 Code GmbH
	*
	* This file is part of PINENTRY.
	*
	* PINENTRY is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* PINENTRY is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see <https://www.gnu.org/licenses/>.
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#ifdef HAVE_CONFIG_H
	#include <config.h>
	#endif

	#ifndef HAVE_W32CE_SYSTEM
	# include <errno.h>
	#endif
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>
	#include <assert.h>
	#include <sys/utsname.h>
	#ifndef HAVE_W32CE_SYSTEM
	# include <locale.h>
	#endif
	#ifdef HAVE_LANGINFO_H
	#include <langinfo.h>
	#endif
	#include <limits.h>
	#ifdef HAVE_W32CE_SYSTEM
	# include <windows.h>
	#endif

	#if defined FALLBACK_CURSES \|\| defined PINENTRY_CURSES \|\| defined PINENTRY_GTK
	#include <iconv.h>
	#endif

	#include <assuan.h>

	#include "memory.h"
	#include "secmem-util.h"
	#include "argparse.h"
	#include "pinentry.h"
	#include "password-cache.h"

	#ifdef INSIDE_EMACS
	# include "pinentry-emacs.h"
	#endif
	#ifdef FALLBACK_CURSES
	# include "pinentry-curses.h"
	#endif

	#ifdef HAVE_W32CE_SYSTEM
	#define getpid() GetCurrentProcessId ()
	#endif

	/* Keep the name of our program here. */
	static char this_pgmname[50];

	struct pinentry pinentry;


	static const char *flavor_flag;

	/* Because gtk_init removes the --display arg from the command lines
	* and our command line parser is called after gtk_init (so that it
	* does not see gtk specific options) we don't have a way to get hold
	* of the --display option. Our solution is to remember --disable in
	* the call to pinentry_have_display and set it then in our
	* parser. */
	static char *remember_display;


	static void
	pinentry_reset (int use_defaults)
	{
	/* GPG Agent sets these options once when it starts the pinentry.
	Don't reset them. */
	int grab = pinentry.grab;
	char *ttyname = pinentry.ttyname;
	char *ttytype = pinentry.ttytype;
	char *ttyalert = pinentry.ttyalert;
	char *lc_ctype = pinentry.lc_ctype;
	char *lc_messages = pinentry.lc_messages;
	int allow_external_password_cache = pinentry.allow_external_password_cache;
	char *default_ok = pinentry.default_ok;
	char *default_cancel = pinentry.default_cancel;
	char *default_prompt = pinentry.default_prompt;
	char *default_pwmngr = pinentry.default_pwmngr;
	char *default_cf_visi = pinentry.default_cf_visi;
	char *default_tt_visi = pinentry.default_tt_visi;
	char *default_tt_hide = pinentry.default_tt_hide;
	char *touch_file = pinentry.touch_file;
	unsigned long owner_pid = pinentry.owner_pid;
	int owner_uid = pinentry.owner_uid;
	char *owner_host = pinentry.owner_host;

	/* These options are set from the command line. Don't reset
	them. */
	int debug = pinentry.debug;
	char *display = pinentry.display;
	int parent_wid = pinentry.parent_wid;

	pinentry_color_t color_fg = pinentry.color_fg;
	int color_fg_bright = pinentry.color_fg_bright;
	pinentry_color_t color_bg = pinentry.color_bg;
	pinentry_color_t color_so = pinentry.color_so;
	int color_so_bright = pinentry.color_so_bright;

	int timeout = pinentry.timeout;

	char *invisible_char = pinentry.invisible_char;


	/* Free any allocated memory. */
	if (use_defaults)
	{
	free (pinentry.ttyname);
	free (pinentry.ttytype);
	free (pinentry.ttyalert);
	free (pinentry.lc_ctype);
	free (pinentry.lc_messages);
	free (pinentry.default_ok);
	free (pinentry.default_cancel);
	free (pinentry.default_prompt);
	free (pinentry.default_pwmngr);
	free (pinentry.default_cf_visi);
	free (pinentry.default_tt_visi);
	free (pinentry.default_tt_hide);
	free (pinentry.touch_file);
	free (pinentry.owner_host);
	free (pinentry.display);
	}

	free (pinentry.title);
	free (pinentry.description);
	free (pinentry.error);
	free (pinentry.prompt);
	free (pinentry.ok);
	free (pinentry.notok);
	free (pinentry.cancel);
	secmem_free (pinentry.pin);
	free (pinentry.repeat_passphrase);
	free (pinentry.repeat_error_string);
	free (pinentry.quality_bar);
	free (pinentry.quality_bar_tt);
	free (pinentry.keyinfo);
	free (pinentry.specific_err_info);

	/* Reset the pinentry structure. */
	memset (&pinentry, 0, sizeof (pinentry));

	/* Restore options without a default we want to preserve. */
	pinentry.invisible_char = invisible_char;

	/* Restore other options or set defaults. */

	if (use_defaults)
	{
	/* Pinentry timeout in seconds. */
	pinentry.timeout = 60;

	/* Global grab. */
	pinentry.grab = 1;

	pinentry.color_fg = PINENTRY_COLOR_DEFAULT;
	pinentry.color_fg_bright = 0;
	pinentry.color_bg = PINENTRY_COLOR_DEFAULT;
	pinentry.color_so = PINENTRY_COLOR_DEFAULT;
	pinentry.color_so_bright = 0;

	pinentry.owner_uid = -1;
	}
	else /* Restore the options. */
	{
	pinentry.grab = grab;
	pinentry.ttyname = ttyname;
	pinentry.ttytype = ttytype;
	pinentry.ttyalert = ttyalert;
	pinentry.lc_ctype = lc_ctype;
	pinentry.lc_messages = lc_messages;
	pinentry.allow_external_password_cache = allow_external_password_cache;
	pinentry.default_ok = default_ok;
	pinentry.default_cancel = default_cancel;
	pinentry.default_prompt = default_prompt;
	pinentry.default_pwmngr = default_pwmngr;
	pinentry.default_cf_visi = default_cf_visi;
	pinentry.default_tt_visi = default_tt_visi;
	pinentry.default_tt_hide = default_tt_hide;
	pinentry.touch_file = touch_file;
	pinentry.owner_pid = owner_pid;
	pinentry.owner_uid = owner_uid;
	pinentry.owner_host = owner_host;

	pinentry.debug = debug;
	pinentry.display = display;
	pinentry.parent_wid = parent_wid;

	pinentry.color_fg = color_fg;
	pinentry.color_fg_bright = color_fg_bright;
	pinentry.color_bg = color_bg;
	pinentry.color_so = color_so;
	pinentry.color_so_bright = color_so_bright;

	pinentry.timeout = timeout;
	}
	}

	static gpg_error_t
	pinentry_assuan_reset_handler (assuan_context_t ctx, char *line)
	{
	(void)ctx;
	(void)line;

	pinentry_reset (0);

	return 0;
	}



	static int lc_ctype_unknown_warning = 0;

	#if defined FALLBACK_CURSES \|\| defined PINENTRY_CURSES \|\| defined PINENTRY_GTK
	char *
	pinentry_utf8_to_local (const char lc_ctype, const char text)
	{
	iconv_t cd;
	const char *input = text;
	size_t input_len = strlen (text) + 1;
	char *output;
	size_t output_len;
	char *output_buf;
	size_t processed;
	char *old_ctype;
	char *target_encoding;

	/* If no locale setting could be determined, simply copy the
	string. */
	if (!lc_ctype)
	{
	if (! lc_ctype_unknown_warning)
	{
	fprintf (stderr, "%s: no LC_CTYPE known - assuming UTF-8\n",
	this_pgmname);
	lc_ctype_unknown_warning = 1;
	}
	return strdup (text);
	}

	old_ctype = strdup (setlocale (LC_CTYPE, NULL));
	if (!old_ctype)
	return NULL;
	setlocale (LC_CTYPE, lc_ctype);
	target_encoding = nl_langinfo (CODESET);
	if (!target_encoding)
	target_encoding = "?";
	setlocale (LC_CTYPE, old_ctype);
	free (old_ctype);

	/* This is overkill, but simplifies the iconv invocation greatly. */
	output_len = input_len * MB_LEN_MAX;
	output_buf = output = malloc (output_len);
	if (!output)
	return NULL;

	cd = iconv_open (target_encoding, "UTF-8");
	if (cd == (iconv_t) -1)
	{
	fprintf (stderr, "%s: can't convert from UTF-8 to %s: %s\n",
	this_pgmname, target_encoding, strerror (errno));
	free (output_buf);
	return NULL;
	}
	processed = iconv (cd, (ICONV_CONST char **)&input, &input_len,
	&output, &output_len);
	iconv_close (cd);
	if (processed == (size_t) -1 \|\| input_len)
	{
	fprintf (stderr, "%s: error converting from UTF-8 to %s: %s\n",
	this_pgmname, target_encoding, strerror (errno));
	free (output_buf);
	return NULL;
	}
	return output_buf;
	}

	/* Convert TEXT which is encoded according to LC_CTYPE to UTF-8. With
	SECURE set to true, use secure memory for the returned buffer.
	Return NULL on error. */
	char *
	pinentry_local_to_utf8 (char lc_ctype, char text, int secure)
	{
	char *old_ctype;
	char *source_encoding;
	iconv_t cd;
	const char *input = text;
	size_t input_len = strlen (text) + 1;
	char *output;
	size_t output_len;
	char *output_buf;
	size_t processed;

	/* If no locale setting could be determined, simply copy the
	string. */
	if (!lc_ctype)
	{
	if (! lc_ctype_unknown_warning)
	{
	fprintf (stderr, "%s: no LC_CTYPE known - assuming UTF-8\n",
	this_pgmname);
	lc_ctype_unknown_warning = 1;
	}
	output_buf = secure? secmem_malloc (input_len) : malloc (input_len);
	if (output_buf)
	strcpy (output_buf, input);
	return output_buf;
	}

	old_ctype = strdup (setlocale (LC_CTYPE, NULL));
	if (!old_ctype)
	return NULL;
	setlocale (LC_CTYPE, lc_ctype);
	source_encoding = nl_langinfo (CODESET);
	setlocale (LC_CTYPE, old_ctype);
	free (old_ctype);

	/* This is overkill, but simplifies the iconv invocation greatly. */
	output_len = input_len * MB_LEN_MAX;
	output_buf = output = secure? secmem_malloc (output_len):malloc (output_len);
	if (!output)
	return NULL;

	cd = iconv_open ("UTF-8", source_encoding);
	if (cd == (iconv_t) -1)
	{
	fprintf (stderr, "%s: can't convert from %s to UTF-8: %s\n",
	this_pgmname, source_encoding? source_encoding : "?",
	strerror (errno));
	if (secure)
	secmem_free (output_buf);
	else
	free (output_buf);
	return NULL;
	}
	processed = iconv (cd, (ICONV_CONST char **)&input, &input_len,
	&output, &output_len);
	iconv_close (cd);
	if (processed == (size_t) -1 \|\| input_len)
	{
	fprintf (stderr, "%s: error converting from %s to UTF-8: %s\n",
	this_pgmname, source_encoding? source_encoding : "?",
	strerror (errno));
	if (secure)
	secmem_free (output_buf);
	else
	free (output_buf);
	return NULL;
	}
	return output_buf;
	}
	#endif


	/* Copy TEXT or TEXTLEN to BUFFER and escape as required. Return a
	pointer to the end of the new buffer. Note that BUFFER must be
	large enough to keep the entire text; allocataing it 3 times of
	TEXTLEN is sufficient. */
	static char *
	copy_and_escape (char buffer, const void text, size_t textlen)
	{
	int i;
	const unsigned char s = (unsigned char )text;
	char *p = buffer;

	for (i=0; i < textlen; i++)
	{
	if (s[i] < ' ' \|\| s[i] == '+')
	{
	snprintf (p, 4, "%%%02X", s[i]);
	p += 3;
	}
	else if (s[i] == ' ')
	*p++ = '+';
	else
	*p++ = s[i];
	}
	return p;
	}


	static char *
	get_cmdline (unsigned long pid)
	{
	char buffer[200];
	FILE *fp;
	size_t i, n;

	snprintf (buffer, sizeof buffer, "/proc/%lu/cmdline", pid);
	buffer[sizeof buffer - 1] = 0;

	fp = fopen (buffer, "rb");
	if (!fp)
	return NULL;
	n = fread (buffer, 1, sizeof buffer - 1, fp);
	if (n < sizeof buffer -1 && ferror (fp))
	{
	/* Some error occurred. */
	fclose (fp);
	return NULL;
	}
	fclose (fp);
	if (n == 0)
	return NULL;
	/* Arguments are delimited by Nuls. We should do proper quoting but
	* that can be a bit complicated, thus we simply replace the Nuls by
	* spaces. */
	for (i=0; i < n; i++)
	if (!buffer[i] && i < n-1)
	buffer[i] = ' ';
	buffer[i] = 0; /* Make sure the last byte is the string terminator. */

	return strdup (buffer);
	}


	/* Atomically ask the kernel for information about process PID.
	* Return a malloc'ed copy of the process name as long as the process
	* uid matches UID. If it cannot determine that the process has uid
	* UID, it returns NULL.

	* This is not as informative as get_cmdline, but it verifies that the
	* process does belong to the user in question.
	*/
	static char *
	get_pid_name_for_uid (unsigned long pid, int uid)
	{
	char buffer[400];
	FILE *fp;
	size_t end, n;
	char *uidstr;

	snprintf (buffer, sizeof buffer, "/proc/%lu/status", pid);
	buffer[sizeof buffer - 1] = 0;

	fp = fopen (buffer, "rb");
	if (!fp)
	return NULL;
	n = fread (buffer, 1, sizeof buffer - 1, fp);
	if (n < sizeof buffer -1 && ferror (fp))
	{
	/* Some error occurred. */
	fclose (fp);
	return NULL;
	}
	fclose (fp);
	if (n == 0)
	return NULL;
	if (strncmp (buffer, "Name:\t", 6))
	return NULL;
	end = strcspn (buffer + 6, "\n") + 6;
	buffer[end] = 0;

	/* check that uid matches what we expect */
	uidstr = strstr (buffer + end + 1, "\nUid:\t");
	if (!uidstr)
	return NULL;
	if (atoi (uidstr + 6) != uid)
	return NULL;

	return strdup (buffer + 6);
	}


	/* Return a malloced string with the title. The caller mus free the
	* string. If no title is available or the title string has an error
	* NULL is returned. */
	char *
	pinentry_get_title (pinentry_t pe)
	{
	char *title;

	if (pe->title)
	title = strdup (pe->title);
	else if (pe->owner_pid)
	{
	char buf[200];
	struct utsname utsbuf;
	char *pidname = NULL;
	char *cmdline = NULL;

	if (pe->owner_host &&
	!uname (&utsbuf) && utsbuf.nodename &&
	!strcmp (utsbuf.nodename, pe->owner_host))
	{
	pidname = get_pid_name_for_uid (pe->owner_pid, pe->owner_uid);
	if (pidname)
	cmdline = get_cmdline (pe->owner_pid);
	}

	if (pe->owner_host && (cmdline \|\| pidname))
	snprintf (buf, sizeof buf, "[%lu]@%s (%s)",
	pe->owner_pid, pe->owner_host, cmdline ? cmdline : pidname);
	else if (pe->owner_host)
	snprintf (buf, sizeof buf, "[%lu]@%s",
	pe->owner_pid, pe->owner_host);
	else
	snprintf (buf, sizeof buf, "[%lu] <unknown host>",
	pe->owner_pid);
	buf[sizeof buf - 1] = 0;
	free (pidname);
	free (cmdline);
	title = strdup (buf);
	}
	else
	title = strdup (this_pgmname);

	return title;
	}


	/* Run a quality inquiry for PASSPHRASE of LENGTH. (We need LENGTH
	because not all backends might be able to return a proper
	C-string.). Returns: A value between -100 and 100 to give an
	estimate of the passphrase's quality. Negative values are use if
	the caller won't even accept that passphrase. Note that we expect
	just one data line which should not be escaped in any represent a
	numeric signed decimal value. Extra data is currently ignored but
	should not be send at all. */
	int
	pinentry_inq_quality (pinentry_t pin, const char *passphrase, size_t length)
	{
	assuan_context_t ctx = pin->ctx_assuan;
	const char prefix[] = "INQUIRE QUALITY ";
	char *command;
	char *line;
	size_t linelen;
	int gotvalue = 0;
	int value = 0;
	int rc;

	if (!ctx)
	return 0; /* Can't run the callback. */

	if (length > 300)
	length = 300; /* Limit so that it definitely fits into an Assuan
	line. */

	command = secmem_malloc (strlen (prefix) + 3*length + 1);
	if (!command)
	return 0;
	strcpy (command, prefix);
	copy_and_escape (command + strlen(command), passphrase, length);
	rc = assuan_write_line (ctx, command);
	secmem_free (command);
	if (rc)
	{
	fprintf (stderr, "ASSUAN WRITE LINE failed: rc=%d\n", rc);
	return 0;
	}

	for (;;)
	{
	do
	{
	rc = assuan_read_line (ctx, &line, &linelen);
	if (rc)
	{
	fprintf (stderr, "ASSUAN READ LINE failed: rc=%d\n", rc);
	return 0;
	}
	}
	while (*line == '#' \|\| !linelen);
	if (line[0] == 'E' && line[1] == 'N' && line[2] == 'D'
	&& (!line[3] \|\| line[3] == ' '))
	break; /* END command received*/
	if (line[0] == 'C' && line[1] == 'A' && line[2] == 'N'
	&& (!line[3] \|\| line[3] == ' '))
	break; /* CAN command received*/
	if (line[0] == 'E' && line[1] == 'R' && line[2] == 'R'
	&& (!line[3] \|\| line[3] == ' '))
	break; /* ERR command received*/
	if (line[0] != 'D' \|\| line[1] != ' ' \|\| linelen < 3 \|\| gotvalue)
	continue;
	gotvalue = 1;
	value = atoi (line+2);
	}
	if (value < -100)
	value = -100;
	else if (value > 100)
	value = 100;

	return value;
	}



	/* Try to make room for at least LEN bytes in the pinentry. Returns
	new buffer on success and 0 on failure or when the old buffer is
	sufficient. */
	char *
	pinentry_setbufferlen (pinentry_t pin, int len)
	{
	char *newp;

	if (pin->pin_len)
	assert (pin->pin);
	else
	assert (!pin->pin);

	if (len < 2048)
	len = 2048;

	if (len <= pin->pin_len)
	return pin->pin;

	newp = secmem_realloc (pin->pin, len);
	if (newp)
	{
	pin->pin = newp;
	pin->pin_len = len;
	}
	else
	{
	secmem_free (pin->pin);
	pin->pin = 0;
	pin->pin_len = 0;
	}
	return newp;
	}

	static void
	pinentry_setbuffer_clear (pinentry_t pin)
	{
	if (! pin->pin)
	{
	assert (pin->pin_len == 0);
	return;
	}

	assert (pin->pin_len > 0);

	secmem_free (pin->pin);
	pin->pin = NULL;
	pin->pin_len = 0;
	}

	static void
	pinentry_setbuffer_init (pinentry_t pin)
	{
	pinentry_setbuffer_clear (pin);
	pinentry_setbufferlen (pin, 0);
	}

	/* passphrase better be alloced with secmem_alloc. */
	void
	pinentry_setbuffer_use (pinentry_t pin, char *passphrase, int len)
	{
	if (! passphrase)
	{
	assert (len == 0);
	pinentry_setbuffer_clear (pin);

	return;
	}

	if (passphrase && len == 0)
	len = strlen (passphrase) + 1;

	if (pin->pin)
	secmem_free (pin->pin);

	pin->pin = passphrase;
	pin->pin_len = len;
	}

	static struct assuan_malloc_hooks assuan_malloc_hooks = {
	secmem_malloc, secmem_realloc, secmem_free
	};

	/* Initialize the secure memory subsystem, drop privileges and return.
	Must be called early. */
	void
	pinentry_init (const char *pgmname)
	{
	/* Store away our name. */
	if (strlen (pgmname) > sizeof this_pgmname - 2)
	abort ();
	strcpy (this_pgmname, pgmname);

	gpgrt_check_version (NULL);

	/* Initialize secure memory. 1 is too small, so the default size
	will be used. */
	secmem_init (1);
	secmem_set_flags (SECMEM_WARN);
	drop_privs ();

	if (atexit (secmem_term))
	{
	/* FIXME: Could not register at-exit function, bail out. */
	}

	assuan_set_malloc_hooks (&assuan_malloc_hooks);
	}

	/* Simple test to check whether DISPLAY is set or the option --display
	was given. Used to decide whether the GUI or curses should be
	initialized. */
	int
	pinentry_have_display (int argc, char **argv)
	{
	int found = 0;

	for (; argc; argc--, argv++)
	{
	if (!strcmp (*argv, "--display"))
	{
	if (argv[1] && !remember_display)
	{
	remember_display = strdup (argv[1]);
	if (!remember_display)
	{
	#ifndef HAVE_W32CE_SYSTEM
	fprintf (stderr, "%s: %s\n", this_pgmname, strerror (errno));
	#endif
	exit (EXIT_FAILURE);
	}
	}
	found = 1;
	break;
	}
	else if (!strncmp (*argv, "--display=", 10))
	{
	if (!remember_display)
	{
	remember_display = strdup (*argv+10);
	if (!remember_display)
	{
	#ifndef HAVE_W32CE_SYSTEM
	fprintf (stderr, "%s: %s\n", this_pgmname, strerror (errno));
	#endif
	exit (EXIT_FAILURE);
	}
	}
	found = 1;
	break;
	}
	}

	#ifndef HAVE_W32CE_SYSTEM
	{
	const char *s;
	s = getenv ("DISPLAY");
	if (s && *s)
	found = 1;
	}
	#endif

	return found;
	}



	/* Print usage information and and provide strings for help. */
	static const char *
	my_strusage( int level )
	{
	const char *p;

	switch (level)
	{
	case 11: p = this_pgmname; break;
	case 12: p = "pinentry"; break;
	case 13: p = PACKAGE_VERSION; break;
	case 14: p = "Copyright (C) 2016 g10 Code GmbH"; break;
	case 19: p = "Please report bugs to <" PACKAGE_BUGREPORT ">.\n"; break;
	case 1:
	case 40:
	{
	static char *str;

	if (!str)
	{
	size_t n = 50 + strlen (this_pgmname);
	str = malloc (n);
	if (str)
	{
	snprintf (str, n, "Usage: %s [options] (-h for help)",
	this_pgmname);
	str[n-1] = 0;
	}
	}
	p = str;
	}
	break;
	case 41:
	p = "Ask securely for a secret and print it to stdout.";
	break;

	case 42:
	p = "1"; /* Flag print 40 as part of 41. */
	break;

	default: p = NULL; break;
	}
	return p;
	}


	char *
	parse_color (char arg, pinentry_color_t color_p, int *bright_p)
	{
	static struct
	{
	const char *name;
	pinentry_color_t color;
	} colors[] = { { "none", PINENTRY_COLOR_NONE },
	{ "default", PINENTRY_COLOR_DEFAULT },
	{ "black", PINENTRY_COLOR_BLACK },
	{ "red", PINENTRY_COLOR_RED },
	{ "green", PINENTRY_COLOR_GREEN },
	{ "yellow", PINENTRY_COLOR_YELLOW },
	{ "blue", PINENTRY_COLOR_BLUE },
	{ "magenta", PINENTRY_COLOR_MAGENTA },
	{ "cyan", PINENTRY_COLOR_CYAN },
	{ "white", PINENTRY_COLOR_WHITE } };

	int i;
	char *new_arg;
	pinentry_color_t color = PINENTRY_COLOR_DEFAULT;

	if (!arg)
	return NULL;

	new_arg = strchr (arg, ',');
	if (new_arg)
	new_arg++;

	if (bright_p)
	{
	const char *bname[] = { "bright-", "bright", "bold-", "bold" };

	*bright_p = 0;
	for (i = 0; i < sizeof (bname) / sizeof (bname[0]); i++)
	if (!strncasecmp (arg, bname[i], strlen (bname[i])))
	{
	*bright_p = 1;
	arg += strlen (bname[i]);
	}
	}

	for (i = 0; i < sizeof (colors) / sizeof (colors[0]); i++)
	if (!strncasecmp (arg, colors[i].name, strlen (colors[i].name)))
	color = colors[i].color;

	*color_p = color;
	return new_arg;
	}

	/* Parse the command line options. May exit the program if only help
	or version output is requested. */
	void
	pinentry_parse_opts (int argc, char *argv[])
	{
	static ARGPARSE_OPTS opts[] = {
	ARGPARSE_s_n('d', "debug", "Turn on debugging output"),
	ARGPARSE_s_s('D', "display", "\|DISPLAY\|Set the X display"),
	ARGPARSE_s_s('T', "ttyname", "\|FILE\|Set the tty terminal node name"),
	ARGPARSE_s_s('N', "ttytype", "\|NAME\|Set the tty terminal type"),
	ARGPARSE_s_s('C', "lc-ctype", "\|STRING\|Set the tty LC_CTYPE value"),
	ARGPARSE_s_s('M', "lc-messages", "\|STRING\|Set the tty LC_MESSAGES value"),
	ARGPARSE_s_i('o', "timeout",
	"\|SECS\|Timeout waiting for input after this many seconds"),
	ARGPARSE_s_n('g', "no-global-grab",
	"Grab keyboard only while window is focused"),
	ARGPARSE_s_u('W', "parent-wid", "Parent window ID (for positioning)"),
	ARGPARSE_s_s('c', "colors", "\|STRING\|Set custom colors for ncurses"),
	ARGPARSE_s_s('a', "ttyalert", "\|STRING\|Set the alert mode (none, beep or flash)"),
	ARGPARSE_end()
	};
	ARGPARSE_ARGS pargs = { &argc, &argv, 0 };

	set_strusage (my_strusage);

	pinentry_reset (1);

	while (arg_parse (&pargs, opts))
	{
	switch (pargs.r_opt)
	{
	case 'd':
	pinentry.debug = 1;
	break;
	case 'g':
	pinentry.grab = 0;
	break;

	case 'D':
	/* Note, this is currently not used because the GUI engine
	has already been initialized when parsing these options. */
	pinentry.display = strdup (pargs.r.ret_str);
	if (!pinentry.display)
	{
	#ifndef HAVE_W32CE_SYSTEM
	fprintf (stderr, "%s: %s\n", this_pgmname, strerror (errno));
	#endif
	exit (EXIT_FAILURE);
	}
	break;
	case 'T':
	pinentry.ttyname = strdup (pargs.r.ret_str);
	if (!pinentry.ttyname)
	{
	#ifndef HAVE_W32CE_SYSTEM
	fprintf (stderr, "%s: %s\n", this_pgmname, strerror (errno));
	#endif
	exit (EXIT_FAILURE);
	}
	break;
	case 'N':
	pinentry.ttytype = strdup (pargs.r.ret_str);
	if (!pinentry.ttytype)
	{
	#ifndef HAVE_W32CE_SYSTEM
	fprintf (stderr, "%s: %s\n", this_pgmname, strerror (errno));
	#endif
	exit (EXIT_FAILURE);
	}
	break;
	case 'C':
	pinentry.lc_ctype = strdup (pargs.r.ret_str);
	if (!pinentry.lc_ctype)
	{
	#ifndef HAVE_W32CE_SYSTEM
	fprintf (stderr, "%s: %s\n", this_pgmname, strerror (errno));
	#endif
	exit (EXIT_FAILURE);
	}
	break;
	case 'M':
	pinentry.lc_messages = strdup (pargs.r.ret_str);
	if (!pinentry.lc_messages)
	{
	#ifndef HAVE_W32CE_SYSTEM
	fprintf (stderr, "%s: %s\n", this_pgmname, strerror (errno));
	#endif
	exit (EXIT_FAILURE);
	}
	break;
	case 'W':
	pinentry.parent_wid = pargs.r.ret_ulong;
	break;

	case 'c':
	{
	char *tmpstr = pargs.r.ret_str;

	tmpstr = parse_color (tmpstr, &pinentry.color_fg,
	&pinentry.color_fg_bright);
	tmpstr = parse_color (tmpstr, &pinentry.color_bg, NULL);
	tmpstr = parse_color (tmpstr, &pinentry.color_so,
	&pinentry.color_so_bright);
	}
	break;

	case 'o':
	pinentry.timeout = pargs.r.ret_int;
	break;

	case 'a':
	pinentry.ttyalert = strdup (pargs.r.ret_str);
	if (!pinentry.ttyalert)
	{
	#ifndef HAVE_W32CE_SYSTEM
	fprintf (stderr, "%s: %s\n", this_pgmname, strerror (errno));
	#endif
	exit (EXIT_FAILURE);
	}
	break;

	default:
	pargs.err = ARGPARSE_PRINT_WARNING;
	break;
	}
	}

	if (!pinentry.display && remember_display)
	{
	pinentry.display = remember_display;
	remember_display = NULL;
	}
	}


	/* Set the optional flag used with getinfo. */
	void
	pinentry_set_flavor_flag (const char *string)
	{
	flavor_flag = string;
	}




	static gpg_error_t
	option_handler (assuan_context_t ctx, const char key, const char value)
	{
	(void)ctx;

	if (!strcmp (key, "no-grab") && !*value)
	pinentry.grab = 0;
	else if (!strcmp (key, "grab") && !*value)
	pinentry.grab = 1;
	else if (!strcmp (key, "debug-wait"))
	{
	#ifndef HAVE_W32CE_SYSTEM
	fprintf (stderr, "%s: waiting for debugger - my pid is %u ...\n",
	this_pgmname, (unsigned int) getpid());
	sleep (*value?atoi (value):5);
	fprintf (stderr, "%s: ... okay\n", this_pgmname);
	#endif
	}
	else if (!strcmp (key, "display"))
	{
	if (pinentry.display)
	free (pinentry.display);
	pinentry.display = strdup (value);
	if (!pinentry.display)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "ttyname"))
	{
	if (pinentry.ttyname)
	free (pinentry.ttyname);
	pinentry.ttyname = strdup (value);
	if (!pinentry.ttyname)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "ttytype"))
	{
	if (pinentry.ttytype)
	free (pinentry.ttytype);
	pinentry.ttytype = strdup (value);
	if (!pinentry.ttytype)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "ttyalert"))
	{
	if (pinentry.ttyalert)
	free (pinentry.ttyalert);
	pinentry.ttyalert = strdup (value);
	if (!pinentry.ttyalert)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "lc-ctype"))
	{
	if (pinentry.lc_ctype)
	free (pinentry.lc_ctype);
	pinentry.lc_ctype = strdup (value);
	if (!pinentry.lc_ctype)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "lc-messages"))
	{
	if (pinentry.lc_messages)
	free (pinentry.lc_messages);
	pinentry.lc_messages = strdup (value);
	if (!pinentry.lc_messages)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "owner"))
	{
	long along;
	char *endp;

	free (pinentry.owner_host);
	pinentry.owner_host = NULL;
	pinentry.owner_uid = -1;
	pinentry.owner_pid = 0;

	errno = 0;
	along = strtol (value, &endp, 10);
	if (along && !errno)
	{
	pinentry.owner_pid = (unsigned long)along;
	if (*endp)
	{
	errno = 0;
	if (endp == '/') { / we have a uid */
	endp++;
	along = strtol (endp, &endp, 10);
	if (along >= 0 && !errno)
	pinentry.owner_uid = (int)along;
	}
	if (endp)
	{
	while (*endp == ' ')
	endp++;
	if (*endp)
	{
	pinentry.owner_host = strdup (endp);
	for (endp=pinentry.owner_host;
	endp && endp != ' '; endp++)
	;
	*endp = 0;
	}
	}
	}
	}
	}
	else if (!strcmp (key, "parent-wid"))
	{
	pinentry.parent_wid = atoi (value);
	/* FIXME: Use strtol and add some error handling. */
	}
	else if (!strcmp (key, "touch-file"))
	{
	if (pinentry.touch_file)
	free (pinentry.touch_file);
	pinentry.touch_file = strdup (value);
	if (!pinentry.touch_file)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "default-ok"))
	{
	pinentry.default_ok = strdup (value);
	if (!pinentry.default_ok)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "default-cancel"))
	{
	pinentry.default_cancel = strdup (value);
	if (!pinentry.default_cancel)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "default-prompt"))
	{
	pinentry.default_prompt = strdup (value);
	if (!pinentry.default_prompt)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "default-pwmngr"))
	{
	pinentry.default_pwmngr = strdup (value);
	if (!pinentry.default_pwmngr)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "default-cf-visi"))
	{
	pinentry.default_cf_visi = strdup (value);
	if (!pinentry.default_cf_visi)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "default-tt-visi"))
	{
	pinentry.default_tt_visi = strdup (value);
	if (!pinentry.default_tt_visi)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "default-tt-hide"))
	{
	pinentry.default_tt_hide = strdup (value);
	if (!pinentry.default_tt_hide)
	return gpg_error_from_syserror ();
	}
	else if (!strcmp (key, "allow-external-password-cache") && !*value)
	{
	pinentry.allow_external_password_cache = 1;
	pinentry.tried_password_cache = 0;
	}
	else if (!strcmp (key, "allow-emacs-prompt") && !*value)
	{
	#ifdef INSIDE_EMACS
	pinentry_enable_emacs_cmd_handler ();
	#endif
	}
	else if (!strcmp (key, "invisible-char"))
	{
	if (pinentry.invisible_char)
	free (pinentry.invisible_char);
	pinentry.invisible_char = strdup (value);
	if (!pinentry.invisible_char)
	return gpg_error_from_syserror ();
	}
	else
	return gpg_error (GPG_ERR_UNKNOWN_OPTION);
	return 0;
	}


	/* Note, that it is sufficient to allocate the target string D as
	long as the source string S, i.e.: strlen(s)+1; */
	static void
	strcpy_escaped (char d, const char s)
	{
	while (*s)
	{
	if (*s == '%' && s[1] && s[2])
	{
	s++;
	*d++ = xtoi_2 ( s);
	s += 2;
	}
	else
	d++ = s++;
	}
	*d = 0;
	}


	static void
	write_status_error (assuan_context_t ctx, pinentry_t pe)
	{
	char buf[500];
	const char *pgm;

	pgm = strchr (this_pgmname, '-');
	if (pgm && pgm[1])
	pgm++;
	else
	pgm = this_pgmname;

	snprintf (buf, sizeof buf, "%s.%s %d %s",
	pgm,
	pe->specific_err_loc? pe->specific_err_loc : "?",
	pe->specific_err,
	pe->specific_err_info? pe->specific_err_info : "");
	buf[sizeof buf -1] = 0;
	assuan_write_status (ctx, "ERROR", buf);
	}


	static gpg_error_t
	cmd_setdesc (assuan_context_t ctx, char *line)
	{
	char *newd;

	(void)ctx;

	newd = malloc (strlen (line) + 1);
	if (!newd)
	return gpg_error_from_syserror ();

	strcpy_escaped (newd, line);
	if (pinentry.description)
	free (pinentry.description);
	pinentry.description = newd;
	return 0;
	}


	static gpg_error_t
	cmd_setprompt (assuan_context_t ctx, char *line)
	{
	char *newp;

	(void)ctx;

	newp = malloc (strlen (line) + 1);
	if (!newp)
	return gpg_error_from_syserror ();

	strcpy_escaped (newp, line);
	if (pinentry.prompt)
	free (pinentry.prompt);
	pinentry.prompt = newp;
	return 0;
	}


	/* The data provided at LINE may be used by pinentry implementations
	to identify a key for caching strategies of its own. The empty
	string and --clear mean that the key does not have a stable
	identifier. */
	static gpg_error_t
	cmd_setkeyinfo (assuan_context_t ctx, char *line)
	{
	(void)ctx;

	if (pinentry.keyinfo)
	free (pinentry.keyinfo);

	if (*line && strcmp(line, "--clear") != 0)
	pinentry.keyinfo = strdup (line);
	else
	pinentry.keyinfo = NULL;

	return 0;
	}


	static gpg_error_t
	cmd_setrepeat (assuan_context_t ctx, char *line)
	{
	char *p;

	(void)ctx;

	p = malloc (strlen (line) + 1);
	if (!p)
	return gpg_error_from_syserror ();

	strcpy_escaped (p, line);
	free (pinentry.repeat_passphrase);
	pinentry.repeat_passphrase = p;
	return 0;
	}


	static gpg_error_t
	cmd_setrepeaterror (assuan_context_t ctx, char *line)
	{
	char *p;

	(void)ctx;

	p = malloc (strlen (line) + 1);
	if (!p)
	return gpg_error_from_syserror ();

	strcpy_escaped (p, line);
	free (pinentry.repeat_error_string);
	pinentry.repeat_error_string = p;
	return 0;
	}


	static gpg_error_t
	cmd_seterror (assuan_context_t ctx, char *line)
	{
	char *newe;

	(void)ctx;

	newe = malloc (strlen (line) + 1);
	if (!newe)
	return gpg_error_from_syserror ();

	strcpy_escaped (newe, line);
	if (pinentry.error)
	free (pinentry.error);
	pinentry.error = newe;
	return 0;
	}


	static gpg_error_t
	cmd_setok (assuan_context_t ctx, char *line)
	{
	char *newo;

	(void)ctx;

	newo = malloc (strlen (line) + 1);
	if (!newo)
	return gpg_error_from_syserror ();

	strcpy_escaped (newo, line);
	if (pinentry.ok)
	free (pinentry.ok);
	pinentry.ok = newo;
	return 0;
	}


	static gpg_error_t
	cmd_setnotok (assuan_context_t ctx, char *line)
	{
	char *newo;

	(void)ctx;

	newo = malloc (strlen (line) + 1);
	if (!newo)
	return gpg_error_from_syserror ();

	strcpy_escaped (newo, line);
	if (pinentry.notok)
	free (pinentry.notok);
	pinentry.notok = newo;
	return 0;
	}


	static gpg_error_t
	cmd_setcancel (assuan_context_t ctx, char *line)
	{
	char *newc;

	(void)ctx;

	newc = malloc (strlen (line) + 1);
	if (!newc)
	return gpg_error_from_syserror ();

	strcpy_escaped (newc, line);
	if (pinentry.cancel)
	free (pinentry.cancel);
	pinentry.cancel = newc;
	return 0;
	}


	static gpg_error_t
	cmd_settimeout (assuan_context_t ctx, char *line)
	{
	(void)ctx;

	if (line && *line)
	pinentry.timeout = atoi (line);

	return 0;
	}

	static gpg_error_t
	cmd_settitle (assuan_context_t ctx, char *line)
	{
	char *newt;

	(void)ctx;

	newt = malloc (strlen (line) + 1);
	if (!newt)
	return gpg_error_from_syserror ();

	strcpy_escaped (newt, line);
	if (pinentry.title)
	free (pinentry.title);
	pinentry.title = newt;
	return 0;
	}

	static gpg_error_t
	cmd_setqualitybar (assuan_context_t ctx, char *line)
	{
	char *newval;

	(void)ctx;

	if (!*line)
	line = "Quality:";

	newval = malloc (strlen (line) + 1);
	if (!newval)
	return gpg_error_from_syserror ();

	strcpy_escaped (newval, line);
	if (pinentry.quality_bar)
	free (pinentry.quality_bar);
	pinentry.quality_bar = newval;
	return 0;
	}

	/* Set the tooltip to be used for a quality bar. */
	static gpg_error_t
	cmd_setqualitybar_tt (assuan_context_t ctx, char *line)
	{
	char *newval;

	(void)ctx;

	if (*line)
	{
	newval = malloc (strlen (line) + 1);
	if (!newval)
	return gpg_error_from_syserror ();

	strcpy_escaped (newval, line);
	}
	else
	newval = NULL;
	if (pinentry.quality_bar_tt)
	free (pinentry.quality_bar_tt);
	pinentry.quality_bar_tt = newval;
	return 0;
	}


	static gpg_error_t
	cmd_getpin (assuan_context_t ctx, char *line)
	{
	int result;
	int set_prompt = 0;
	int just_read_password_from_cache = 0;

	(void)line;

	pinentry_setbuffer_init (&pinentry);
	if (!pinentry.pin)
	return gpg_error (GPG_ERR_ENOMEM);

	/* Try reading from the password cache. */
	if (/* If repeat passphrase is set, then we don't want to read from
	the cache. */
	! pinentry.repeat_passphrase
	/* Are we allowed to read from the cache? */
	&& pinentry.allow_external_password_cache
	&& pinentry.keyinfo
	/* Only read from the cache if we haven't already tried it. */
	&& ! pinentry.tried_password_cache
	/* If the last read resulted in an error, then don't read from
	the cache. */
	&& ! pinentry.error)
	{
	char *password;
	int give_up_on_password_store = 0;

	pinentry.tried_password_cache = 1;

	password = password_cache_lookup (pinentry.keyinfo, &give_up_on_password_store);
	if (give_up_on_password_store)
	pinentry.allow_external_password_cache = 0;

	if (password)
	/* There is a cached password. Try it. */
	{
	int len = strlen(password) + 1;
	if (len > pinentry.pin_len)
	len = pinentry.pin_len;

	memcpy (pinentry.pin, password, len);
	pinentry.pin[len] = '\0';

	secmem_free (password);

	pinentry.pin_from_cache = 1;

	assuan_write_status (ctx, "PASSWORD_FROM_CACHE", "");

	/* Result is the length of the password not including the
	NUL terminator. */
	result = len - 1;

	just_read_password_from_cache = 1;

	goto out;
	}
	}

	/* The password was not cached (or we are not allowed to / cannot
	use the cache). Prompt the user. */
	pinentry.pin_from_cache = 0;

	if (!pinentry.prompt)
	{
	pinentry.prompt = pinentry.default_prompt?pinentry.default_prompt:"PIN:";
	set_prompt = 1;
	}
	pinentry.locale_err = 0;
	pinentry.specific_err = 0;
	pinentry.specific_err_loc = NULL;
	free (pinentry.specific_err_info);
	pinentry.specific_err_info = NULL;
	pinentry.close_button = 0;
	pinentry.repeat_okay = 0;
	pinentry.one_button = 0;
	pinentry.ctx_assuan = ctx;
	result = (*pinentry_cmd_handler) (&pinentry);
	pinentry.ctx_assuan = NULL;
	if (pinentry.error)
	{
	free (pinentry.error);
	pinentry.error = NULL;
	}
	if (pinentry.repeat_passphrase)
	{
	free (pinentry.repeat_passphrase);
	pinentry.repeat_passphrase = NULL;
	}
	if (set_prompt)
	pinentry.prompt = NULL;

	pinentry.quality_bar = 0; /* Reset it after the command. */

	if (pinentry.close_button)
	assuan_write_status (ctx, "BUTTON_INFO", "close");

	if (result < 0)
	{
	pinentry_setbuffer_clear (&pinentry);
	if (pinentry.specific_err)
	{
	write_status_error (ctx, &pinentry);
	return pinentry.specific_err;
	}
	return (pinentry.locale_err
	? gpg_error (GPG_ERR_LOCALE_PROBLEM)
	: gpg_error (GPG_ERR_CANCELED));
	}

	out:
	if (result)
	{
	if (pinentry.repeat_okay)
	assuan_write_status (ctx, "PIN_REPEATED", "");
	result = assuan_send_data (ctx, pinentry.pin, strlen(pinentry.pin));
	if (!result)
	result = assuan_send_data (ctx, NULL, 0);

	if (/* GPG Agent says it's okay. */
	pinentry.allow_external_password_cache && pinentry.keyinfo
	/* We didn't just read it from the cache. */
	&& ! just_read_password_from_cache
	/* And the user said it's okay. */
	&& pinentry.may_cache_password)
	/* Cache the password. */
	password_cache_save (pinentry.keyinfo, pinentry.pin);
	}

	pinentry_setbuffer_clear (&pinentry);

	return result;
	}


	/* Note that the option --one-button is a hack to allow the use of old
	pinentries while the caller is ignoring the result. Given that
	options have never been used or flagged as an error the new option
	is an easy way to enable the messsage mode while not requiring to
	update pinentry or to have the caller test for the message
	command. New applications which are free to require an updated
	pinentry should use MESSAGE instead. */
	static gpg_error_t
	cmd_confirm (assuan_context_t ctx, char *line)
	{
	int result;

	pinentry.one_button = !!strstr (line, "--one-button");
	pinentry.quality_bar = 0;
	pinentry.close_button = 0;
	pinentry.locale_err = 0;
	pinentry.specific_err = 0;
	pinentry.specific_err_loc = NULL;
	free (pinentry.specific_err_info);
	pinentry.specific_err_info = NULL;
	pinentry.canceled = 0;
	pinentry_setbuffer_clear (&pinentry);
	result = (*pinentry_cmd_handler) (&pinentry);
	if (pinentry.error)
	{
	free (pinentry.error);
	pinentry.error = NULL;
	}

	if (pinentry.close_button)
	assuan_write_status (ctx, "BUTTON_INFO", "close");

	if (result > 0)
	return 0; /* OK */

	if (pinentry.specific_err)
	{
	write_status_error (ctx, &pinentry);
	return pinentry.specific_err;
	}

	if (pinentry.locale_err)
	return gpg_error (GPG_ERR_LOCALE_PROBLEM);

	if (pinentry.one_button)
	return 0; /* OK */

	if (pinentry.canceled)
	return gpg_error (GPG_ERR_CANCELED);
	return gpg_error (GPG_ERR_NOT_CONFIRMED);
	}


	static gpg_error_t
	cmd_message (assuan_context_t ctx, char *line)
	{
	(void)line;

	return cmd_confirm (ctx, "--one-button");
	}

	/* GETINFO <what>

	Multipurpose function to return a variety of information.
	Supported values for WHAT are:

	version - Return the version of the program.
	pid - Return the process id of the server.
	flavor - Return information about the used pinentry flavor
	ttyinfo - Return DISPLAY and ttyinfo.
	*/
	static gpg_error_t
	cmd_getinfo (assuan_context_t ctx, char *line)
	{
	int rc;
	const char *s;
	char buffer[100];

	if (!strcmp (line, "version"))
	{
	s = VERSION;
	rc = assuan_send_data (ctx, s, strlen (s));
	}
	else if (!strcmp (line, "pid"))
	{

	snprintf (buffer, sizeof buffer, "%lu", (unsigned long)getpid ());
	buffer[sizeof buffer -1] = 0;
	rc = assuan_send_data (ctx, buffer, strlen (buffer));
	}
	else if (!strcmp (line, "flavor"))
	{
	if (!strncmp (this_pgmname, "pinentry-", 9) && this_pgmname[9])
	s = this_pgmname + 9;
	else
	s = this_pgmname;

	snprintf (buffer, sizeof buffer, "%s%s%s",
	s,
	flavor_flag? ":":"",
	flavor_flag? flavor_flag : "");
	buffer[sizeof buffer -1] = 0;
	rc = assuan_send_data (ctx, buffer, strlen (buffer));
	/* if (!rc) */
	/* rc = assuan_write_status (ctx, "FEATURES", "tabbing foo bar"); */
	}
	else if (!strcmp (line, "ttyinfo"))
	{
	snprintf (buffer, sizeof buffer, "%s %s %s",
	pinentry.ttyname? pinentry.ttyname : "-",
	pinentry.ttytype? pinentry.ttytype : "-",
	pinentry.display? pinentry.display : "-" );
	buffer[sizeof buffer -1] = 0;
	rc = assuan_send_data (ctx, buffer, strlen (buffer));
	}
	else
	rc = gpg_error (GPG_ERR_ASS_PARAMETER);
	return rc;
	}

	/* CLEARPASSPHRASE <cacheid>

	Clear the cache passphrase associated with the key identified by
	cacheid.
	*/
	static gpg_error_t
	cmd_clear_passphrase (assuan_context_t ctx, char *line)
	{
	(void)ctx;

	if (! line)
	return gpg_error (GPG_ERR_ASS_INV_VALUE);

	/* Remove leading and trailing white space. */
	while (*line == ' ')
	line ++;
	while (line[strlen (line) - 1] == ' ')
	line[strlen (line) - 1] = 0;

	switch (password_cache_clear (line))
	{
	case 1: return 0;
	case 0: return gpg_error (GPG_ERR_ASS_INV_VALUE);
	default: return gpg_error (GPG_ERR_ASS_GENERAL);
	}
	}

	/* Tell the assuan library about our commands. */
	static gpg_error_t
	register_commands (assuan_context_t ctx)
	{
	static struct
	{
	const char *name;
	gpg_error_t (handler) (assuan_context_t, char line);
	} table[] =
	{
	{ "SETDESC", cmd_setdesc },
	{ "SETPROMPT", cmd_setprompt },
	{ "SETKEYINFO", cmd_setkeyinfo },
	{ "SETREPEAT", cmd_setrepeat },
	{ "SETREPEATERROR", cmd_setrepeaterror },
	{ "SETERROR", cmd_seterror },
	{ "SETOK", cmd_setok },
	{ "SETNOTOK", cmd_setnotok },
	{ "SETCANCEL", cmd_setcancel },
	{ "GETPIN", cmd_getpin },
	{ "CONFIRM", cmd_confirm },
	{ "MESSAGE", cmd_message },
	{ "SETQUALITYBAR", cmd_setqualitybar },
	{ "SETQUALITYBAR_TT", cmd_setqualitybar_tt },
	{ "GETINFO", cmd_getinfo },
	{ "SETTITLE", cmd_settitle },
	{ "SETTIMEOUT", cmd_settimeout },
	{ "CLEARPASSPHRASE", cmd_clear_passphrase },
	{ NULL }
	};
	int i, j;
	gpg_error_t rc;

	for (i = j = 0; table[i].name; i++)
	{
	rc = assuan_register_command (ctx, table[i].name, table[i].handler, NULL);
	if (rc)
	return rc;
	}
	return 0;
	}


	int
	pinentry_loop2 (int infd, int outfd)
	{
	gpg_error_t rc;
	assuan_fd_t filedes[2];
	assuan_context_t ctx;

	/* Extra check to make sure we have dropped privs. */
	#ifndef HAVE_DOSISH_SYSTEM
	if (getuid() != geteuid())
	abort ();
	#endif

	rc = assuan_new (&ctx);
	if (rc)
	{
	fprintf (stderr, "server context creation failed: %s\n",
	gpg_strerror (rc));
	return -1;
	}

	/* For now we use a simple pipe based server so that we can work
	from scripts. We will later add options to run as a daemon and
	wait for requests on a Unix domain socket. */
	filedes[0] = assuan_fdopen (infd);
	filedes[1] = assuan_fdopen (outfd);
	rc = assuan_init_pipe_server (ctx, filedes);
	if (rc)
	{
	fprintf (stderr, "%s: failed to initialize the server: %s\n",
	this_pgmname, gpg_strerror (rc));
	return -1;
	}
	rc = register_commands (ctx);
	if (rc)
	{
	fprintf (stderr, "%s: failed to the register commands with Assuan: %s\n",
	this_pgmname, gpg_strerror (rc));
	return -1;
	}

	assuan_register_option_handler (ctx, option_handler);
	#if 0
	assuan_set_log_stream (ctx, stderr);
	#endif
	assuan_register_reset_notify (ctx, pinentry_assuan_reset_handler);

	for (;;)
	{
	rc = assuan_accept (ctx);
	if (rc == -1)
	break;
	else if (rc)
	{
	fprintf (stderr, "%s: Assuan accept problem: %s\n",
	this_pgmname, gpg_strerror (rc));
	break;
	}

	rc = assuan_process (ctx);
	if (rc)
	{
	fprintf (stderr, "%s: Assuan processing failed: %s\n",
	this_pgmname, gpg_strerror (rc));
	continue;
	}
	}

	assuan_release (ctx);
	return 0;
	}


	/* Start the pinentry event loop. The program will start to process
	Assuan commands until it is finished or an error occurs. If an
	error occurs, -1 is returned. Otherwise, 0 is returned. */
	int
	pinentry_loop (void)
	{
	return pinentry_loop2 (STDIN_FILENO, STDOUT_FILENO);
	}

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