Bring pinentry into sync with current GPG git

6 files changed, 1104 insertions, 83 deletions

diff --git a/pinentry/argparse.c b/pinentry/argparse.c
index e31b67e..ee9c08b 100644
--- a/pinentry/argparse.c
+++ b/pinentry/argparse.c
@@ -26,7 +26,8 @@
  *
  * You should have received a copies of the GNU General Public License
  * and the GNU Lesser General Public License along with this program;
- * if not, see <http://www.gnu.org/licenses/>.
+ * if not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: (GPL-2.0+ OR LGPL-3.0+)
  */
 
 /* This file may be used as part of GnuPG or standalone.  A GnuPG
@@ -845,7 +846,7 @@ find_long_option( ARGPARSE_ARGS *arg,
     /* Would be better if we can do a binary search, but it is not
        possible to reorder our option table because we would mess
        up our help strings - What we can do is: Build a nice option
-       lookup table wehn this function is first invoked */
+       lookup table when this function is first invoked */
     if( !*keyword )
 	return -1;
     for(i=0; opts[i].short_opt; i++ )
@@ -1490,10 +1491,10 @@ strusage( int level )
     case 10:
 #if ARGPARSE_GPL_VERSION == 3
       p = ("License GPLv3+: GNU GPL version 3 or later "
-           "<http://gnu.org/licenses/gpl.html>");
+           "<https://www.gnu.org/licenses/gpl.html>");
 #else
       p = ("License GPLv2+: GNU GPL version 2 or later "
-           "<http://gnu.org/licenses/>");
+           "<https://www.gnu.org/licenses/>");
 #endif
       break;
     case 11: p = "foo"; break;
@@ -1515,7 +1516,7 @@ ARGPARSE_STR2(ARGPARSE_GPL_VERSION)
 "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
 "GNU General Public License for more details.\n\n"
 "You should have received a copy of the GNU General Public License\n"
-"along with this software.  If not, see <http://www.gnu.org/licenses/>.\n";
+"along with this software.  If not, see <https://www.gnu.org/licenses/>.\n";
       break;
     case 40: /* short and long usage */
     case 41: p = ""; break;
diff --git a/pinentry/argparse.h b/pinentry/argparse.h
index b4dc253..5b652eb 100644
--- a/pinentry/argparse.h
+++ b/pinentry/argparse.h
@@ -25,7 +25,8 @@
  *
  * You should have received a copies of the GNU General Public License
  * and the GNU Lesser General Public License along with this program;
- * if not, see <http://www.gnu.org/licenses/>.
+ * if not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: (GPL-2.0+ OR LGPL-3.0+)
  */
 
 #ifndef LIBJNLIB_ARGPARSE_H
diff --git a/pinentry/password-cache.c b/pinentry/password-cache.c
index 70b33f4..f9523b1 100644
--- a/pinentry/password-cache.c
+++ b/pinentry/password-cache.c
@@ -14,7 +14,8 @@
    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 <http://www.gnu.org/licenses/>.
+   along with this program; if not, see <https://www.gnu.org/licenses/>.
+   SPDX-License-Identifier: GPL-2.0+
  */
 
 #ifdef HAVE_CONFIG_H
@@ -83,7 +84,7 @@ password_cache_save (const char *keygrip, const char *password)
 				    "stored-by", "GnuPG Pinentry",
 				    "keygrip", keygrip, NULL))
     {
-      printf("Failed to cache password for key %s with secret service: %s\n",
+      fprintf (stderr, "Failed to cache password for key %s with secret service: %s\n",
 	     keygrip, error->message);
 
       g_error_free (error);
@@ -91,12 +92,14 @@ password_cache_save (const char *keygrip, const char *password)
 
   free (label);
 #else
+  (void) keygrip;
+  (void) password;
   return;
 #endif
 }
 
 char *
-password_cache_lookup (const char *keygrip)
+password_cache_lookup (const char *keygrip, int *fatal_error)
 {
 #ifdef HAVE_LIBSECRET
   GError *error = NULL;
@@ -112,7 +115,10 @@ password_cache_lookup (const char *keygrip)
 
   if (error != NULL)
     {
-      printf("Failed to lookup password for key %s with secret service: %s\n",
+      if (fatal_error)
+	*fatal_error = 1;
+
+      fprintf (stderr, "Failed to lookup password for key %s with secret service: %s\n",
 	     keygrip, error->message);
       g_error_free (error);
       return NULL;
@@ -126,12 +132,14 @@ password_cache_lookup (const char *keygrip)
   if (password2)
     strcpy(password2, password);
   else
-    printf("secmem_malloc failed: can't copy password!\n");
+    fprintf (stderr, "secmem_malloc failed: can't copy password!\n");
 
   secret_password_free (password);
 
   return password2;
 #else
+  (void) keygrip;
+  (void) fatal_error;
   return NULL;
 #endif
 }
@@ -148,7 +156,7 @@ password_cache_clear (const char *keygrip)
 					    "keygrip", keygrip, NULL);
   if (error != NULL)
     {
-      printf("Failed to clear password for key %s with secret service: %s\n",
+      fprintf (stderr, "Failed to clear password for key %s with secret service: %s\n",
 	     keygrip, error->message);
       g_debug("%s", error->message);
       g_error_free (error);
@@ -158,6 +166,7 @@ password_cache_clear (const char *keygrip)
     return 1;
   return 0;
 #else
+  (void) keygrip;
   return -1;
 #endif
 }
diff --git a/pinentry/password-cache.h b/pinentry/password-cache.h
index 0bc8788..d7ccfee 100644
--- a/pinentry/password-cache.h
+++ b/pinentry/password-cache.h
@@ -14,7 +14,8 @@
    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 <http://www.gnu.org/licenses/>.
+   along with this program; if not, see <https://www.gnu.org/licenses/>.
+   SPDX-License-Identifier: GPL-2.0+
  */
 
 #ifndef PASSWORD_CACHE_H
@@ -22,7 +23,7 @@
 
 void password_cache_save (const char *key_grip, const char *password);
 
-char *password_cache_lookup (const char *key_grip);
+char *password_cache_lookup (const char *key_grip, int *fatal_error);
 
 int password_cache_clear (const char *keygrip);
 
diff --git a/pinentry/pinentry.c b/pinentry/pinentry.c
index f305a7d..b03b90c 100644
--- a/pinentry/pinentry.c
+++ b/pinentry/pinentry.c
@@ -1,28 +1,58 @@
 /* pinentry.c - The PIN entry support library
-   Copyright (C) 2002, 2003, 2007, 2008, 2010, 2015 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 <http://www.gnu.org/licenses/>.
+ * Copyright (C) 2002, 2003, 2007, 2008, 2010, 2015, 2016, 2021 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 <sys/types.h>
+#include <sys/stat.h>
 #include <unistd.h>
 #include <assert.h>
+#ifndef HAVE_W32_SYSTEM
+# include <sys/utsname.h>
+#endif
+#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
+
+#undef WITH_UTF8_CONVERSION
+#if defined FALLBACK_CURSES || defined PINENTRY_CURSES || defined PINENTRY_GTK
+# include <iconv.h>
+# define WITH_UTF8_CONVERSION 1
+#endif
 
 #include <assuan.h>
+#include <strings.h>
 
 #include "memory.h"
 #include "secmem-util.h"
@@ -30,11 +60,39 @@
 #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 --display in
+ * the call to pinentry_have_display and set it then in our
+ * parser.  */
+static char *remember_display;
+
+/* Flag to remember whether a warning has been printed.  */
+#ifdef WITH_UTF8_CONVERSION
+static int lc_ctype_unknown_warning;
+#endif
+
+
 static void
 pinentry_reset (int use_defaults)
 {
@@ -42,7 +100,8 @@ pinentry_reset (int use_defaults)
      Don't reset them.  */
   int grab = pinentry.grab;
   char *ttyname = pinentry.ttyname;
-  char *ttytype = pinentry.ttytype;
+  char *ttytype = pinentry.ttytype_l;
+  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;
@@ -50,7 +109,18 @@ pinentry_reset (int use_defaults)
   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 *default_capshint = pinentry.default_capshint;
   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;
+  int constraints_enforce = pinentry.constraints_enforce;
+  char *constraints_hint_short = pinentry.constraints_hint_short;
+  char *constraints_hint_long = pinentry.constraints_hint_long;
+  char *constraints_error_title = pinentry.constraints_error_title;
 
   /* These options are set from the command line.  Don't reset
      them.  */
@@ -64,21 +134,33 @@ pinentry_reset (int use_defaults)
   pinentry_color_t color_so = pinentry.color_so;
   int color_so_bright = pinentry.color_so_bright;
 
-  int timout = pinentry.timeout;
+  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.ttytype_l);
+      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.default_capshint);
       free (pinentry.touch_file);
+      free (pinentry.owner_host);
       free (pinentry.display);
+      free (pinentry.constraints_hint_short);
+      free (pinentry.constraints_hint_long);
+      free (pinentry.constraints_error_title);
     }
 
   free (pinentry.title);
@@ -93,11 +175,18 @@ pinentry_reset (int use_defaults)
   free (pinentry.repeat_error_string);
   free (pinentry.quality_bar);
   free (pinentry.quality_bar_tt);
+  free (pinentry.formatted_passphrase_hint);
   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.  */
@@ -111,13 +200,15 @@ pinentry_reset (int use_defaults)
       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.  */
+  else /* Restore the options.  */
     {
       pinentry.grab = grab;
       pinentry.ttyname = ttyname;
-      pinentry.ttytype = ttytype;
+      pinentry.ttytype_l = ttytype;
+      pinentry.ttyalert = ttyalert;
       pinentry.lc_ctype = lc_ctype;
       pinentry.lc_messages = lc_messages;
       pinentry.allow_external_password_cache = allow_external_password_cache;
@@ -125,7 +216,18 @@ pinentry_reset (int use_defaults)
       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.default_capshint = default_capshint;
       pinentry.touch_file = touch_file;
+      pinentry.owner_pid = owner_pid;
+      pinentry.owner_uid = owner_uid;
+      pinentry.owner_host = owner_host;
+      pinentry.constraints_enforce = constraints_enforce;
+      pinentry.constraints_hint_short = constraints_hint_short;
+      pinentry.constraints_hint_long = constraints_hint_long;
+      pinentry.constraints_error_title = constraints_error_title;
 
       pinentry.debug = debug;
       pinentry.display = display;
@@ -137,7 +239,7 @@ pinentry_reset (int use_defaults)
       pinentry.color_so = color_so;
       pinentry.color_so_bright = color_so_bright;
 
-      pinentry.timeout = timout;
+      pinentry.timeout = timeout;
     }
 }
 
@@ -154,7 +256,149 @@ pinentry_assuan_reset_handler (assuan_context_t ctx, char *line)
 
 
 
-static int lc_ctype_unknown_warning = 0;
+#ifdef WITH_UTF8_CONVERSION
+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;
+}
+#endif /*WITH_UTF8_CONVERSION*/
+
+
+/* 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. */
+#ifdef WITH_UTF8_CONVERSION
+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 /*WITH_UTF8_CONVERSION*/
+
 
 /* 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
@@ -183,6 +427,172 @@ copy_and_escape (char *buffer, const void *text, size_t textlen)
 }
 
 
+/* Perform percent unescaping in STRING and return the new valid length
+   of the string.  A terminating Nul character is inserted at the end of
+   the unescaped string.
+ */
+static size_t
+do_unescape_inplace (char *s)
+{
+  unsigned char *p, *p0;
+
+  p = p0 = s;
+  while (*s)
+    {
+      if (*s == '%' && s[1] && s[2])
+        {
+          s++;
+          *p++ = xtoi_2 (s);
+          s += 2;
+        }
+      else
+        *p++ = *s++;
+    }
+  *p = 0;
+
+  return (p - p0);
+}
+
+
+/* Return a malloced copy of the commandline for PID.  If this is not
+ * possible NULL is returned.  */
+#ifndef HAVE_W32_SYSTEM
+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);
+}
+#endif /*!HAVE_W32_SYSTEM*/
+
+
+/* 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.
+ */
+#ifndef HAVE_W32_SYSTEM
+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;
+  /* Fixme: Is it specified that "Name" is always the first line?  For
+   * robustness I would prefer to have a real parser here. -wk  */
+  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);
+}
+#endif /*!HAVE_W32_SYSTEM*/
+
+
+/* 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);
+#ifndef HAVE_W32_SYSTEM
+  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);
+    }
+#endif /*!HAVE_W32_SYSTEM*/
+  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
@@ -259,6 +669,122 @@ pinentry_inq_quality (pinentry_t pin, const char *passphrase, size_t length)
 }
 
 
+/* Run a checkpin inquiry */
+char *
+pinentry_inq_checkpin (pinentry_t pin, const char *passphrase, size_t length)
+{
+  assuan_context_t ctx = pin->ctx_assuan;
+  const char prefix[] = "INQUIRE CHECKPIN ";
+  char *command;
+  char *line;
+  size_t linelen;
+  int gotvalue = 0;
+  char *value = NULL;
+  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 = strdup (line + 2);
+    }
+
+  return value;
+}
+
+
+/* Run a genpin inquiry */
+char *
+pinentry_inq_genpin (pinentry_t pin)
+{
+  assuan_context_t ctx = pin->ctx_assuan;
+  const char prefix[] = "INQUIRE GENPIN";
+  char *line;
+  size_t linelen;
+  int gotvalue = 0;
+  char *value = NULL;
+  int rc;
+
+  if (!ctx)
+    return 0; /* Can't run the callback.  */
+
+  rc = assuan_write_line (ctx, prefix);
+  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);
+              free (value);
+              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 = strdup (line + 2);
+    }
+
+  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
@@ -375,10 +901,54 @@ pinentry_init (const char *pgmname)
 int
 pinentry_have_display (int argc, char **argv)
 {
+  int found = 0;
+
   for (; argc; argc--, argv++)
-    if (!strcmp (*argv, "--display") || !strncmp (*argv, "--display=", 10))
-      return 1;
-  return 0;
+    {
+      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;
 }
 
 
@@ -394,7 +964,7 @@ my_strusage( int level )
     case 11: p = this_pgmname; break;
     case 12: p = "pinentry"; break;
     case 13: p = PACKAGE_VERSION; break;
-    case 14: p = "Copyright (C) 2015 g10 Code GmbH"; 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:
@@ -406,8 +976,11 @@ my_strusage( int level )
             size_t n = 50 + strlen (this_pgmname);
             str = malloc (n);
             if (str)
-              snprintf (str, n, "Usage: %s [options] (-h for help)",
-                        this_pgmname);
+              {
+                snprintf (str, n, "Usage: %s [options] (-h for help)",
+                          this_pgmname);
+                str[n-1] = 0;
+              }
           }
         p = str;
       }
@@ -494,6 +1067,7 @@ pinentry_parse_opts (int argc, char *argv[])
                  "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 };
@@ -519,6 +1093,9 @@ pinentry_parse_opts (int argc, char *argv[])
 	  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;
@@ -526,13 +1103,19 @@ pinentry_parse_opts (int argc, char *argv[])
 	  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)
+	  pinentry.ttytype_l = strdup (pargs.r.ret_str);
+	  if (!pinentry.ttytype_l)
 	    {
+#ifndef HAVE_W32CE_SYSTEM
+	      fprintf (stderr, "%s: %s\n", this_pgmname, strerror (errno));
+#endif
 	      exit (EXIT_FAILURE);
 	    }
 	  break;
@@ -540,6 +1123,9 @@ pinentry_parse_opts (int argc, char *argv[])
 	  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;
@@ -547,6 +1133,9 @@ pinentry_parse_opts (int argc, char *argv[])
 	  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;
@@ -570,13 +1159,40 @@ pinentry_parse_opts (int argc, char *argv[])
 	  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)
@@ -589,6 +1205,12 @@ option_handler (assuan_context_t ctx, const char *key, const char *value)
     pinentry.grab = 1;
   else if (!strcmp (key, "debug-wait"))
     {
+#ifndef HAVE_W32_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"))
     {
@@ -608,10 +1230,18 @@ option_handler (assuan_context_t ctx, const char *key, const char *value)
     }
   else if (!strcmp (key, "ttytype"))
     {
-      if (pinentry.ttytype)
-	free (pinentry.ttytype);
-      pinentry.ttytype = strdup (value);
-      if (!pinentry.ttytype)
+      if (pinentry.ttytype_l)
+	free (pinentry.ttytype_l);
+      pinentry.ttytype_l = strdup (value);
+      if (!pinentry.ttytype_l)
+	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"))
@@ -630,6 +1260,46 @@ option_handler (assuan_context_t ctx, const char *key, const char *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);
@@ -667,6 +1337,30 @@ option_handler (assuan_context_t ctx, const char *key, const char *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, "default-capshint"))
+    {
+      pinentry.default_capshint = strdup (value);
+      if (!pinentry.default_capshint)
+	return gpg_error_from_syserror ();
+    }
   else if (!strcmp (key, "allow-external-password-cache") && !*value)
     {
       pinentry.allow_external_password_cache = 1;
@@ -674,7 +1368,59 @@ option_handler (assuan_context_t ctx, const char *key, const char *value)
     }
   else if (!strcmp (key, "allow-emacs-prompt") && !*value)
     {
-      return gpg_error (GPG_ERR_NOT_SUPPORTED);
+#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 if (!strcmp (key, "formatted-passphrase") && !*value)
+    {
+      pinentry.formatted_passphrase = 1;
+    }
+  else if (!strcmp (key, "formatted-passphrase-hint"))
+    {
+      if (pinentry.formatted_passphrase_hint)
+        free (pinentry.formatted_passphrase_hint);
+      pinentry.formatted_passphrase_hint = strdup (value);
+      if (!pinentry.formatted_passphrase_hint)
+	return gpg_error_from_syserror ();
+      do_unescape_inplace(pinentry.formatted_passphrase_hint);
+    }
+  else if (!strcmp (key, "constraints-enforce") && !*value)
+    pinentry.constraints_enforce = 1;
+  else if (!strcmp (key, "constraints-hint-short"))
+    {
+      if (pinentry.constraints_hint_short)
+        free (pinentry.constraints_hint_short);
+      pinentry.constraints_hint_short = strdup (value);
+      if (!pinentry.constraints_hint_short)
+	return gpg_error_from_syserror ();
+      do_unescape_inplace(pinentry.constraints_hint_short);
+    }
+  else if (!strcmp (key, "constraints-hint-long"))
+    {
+      if (pinentry.constraints_hint_long)
+        free (pinentry.constraints_hint_long);
+      pinentry.constraints_hint_long = strdup (value);
+      if (!pinentry.constraints_hint_long)
+	return gpg_error_from_syserror ();
+      do_unescape_inplace(pinentry.constraints_hint_long);
+    }
+  else if (!strcmp (key, "constraints-error-title"))
+    {
+      if (pinentry.constraints_error_title)
+        free (pinentry.constraints_error_title);
+      pinentry.constraints_error_title = strdup (value);
+      if (!pinentry.constraints_error_title)
+	return gpg_error_from_syserror ();
+      do_unescape_inplace(pinentry.constraints_error_title);
     }
   else
     return gpg_error (GPG_ERR_UNKNOWN_OPTION);
@@ -702,6 +1448,28 @@ strcpy_escaped (char *d, const char *s)
 }
 
 
+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)
 {
@@ -947,6 +1715,53 @@ cmd_setqualitybar_tt (assuan_context_t ctx, char *line)
   return 0;
 }
 
+/* Set the tooltip to be used for a generate action.  */
+static gpg_error_t
+cmd_setgenpin_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.genpin_tt)
+    free (pinentry.genpin_tt);
+  pinentry.genpin_tt = newval;
+  return 0;
+}
+
+/* Set the label to be used for a generate action.  */
+static gpg_error_t
+cmd_setgenpin_label (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.genpin_label)
+    free (pinentry.genpin_label);
+  pinentry.genpin_label = newval;
+  return 0;
+}
 
 static gpg_error_t
 cmd_getpin (assuan_context_t ctx, char *line)
@@ -975,10 +1790,14 @@ cmd_getpin (assuan_context_t ctx, char *line)
       && ! pinentry.error)
     {
       char *password;
+      int give_up_on_password_store = 0;
 
       pinentry.tried_password_cache = 1;
 
-      password = password_cache_lookup (pinentry.keyinfo);
+      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.  */
 	{
@@ -1016,6 +1835,9 @@ cmd_getpin (assuan_context_t ctx, char *line)
     }
   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;
@@ -1044,7 +1866,14 @@ cmd_getpin (assuan_context_t ctx, char *line)
     {
       pinentry_setbuffer_clear (&pinentry);
       if (pinentry.specific_err)
-        return pinentry.specific_err;
+        {
+          write_status_error (ctx, &pinentry);
+
+          if (gpg_err_code (pinentry.specific_err) == GPG_ERR_FULLY_CANCELED)
+            assuan_set_flag (ctx, ASSUAN_FORCE_CLOSE, 1);
+
+          return pinentry.specific_err;
+        }
       return (pinentry.locale_err
 	      ? gpg_error (GPG_ERR_LOCALE_PROBLEM)
 	      : gpg_error (GPG_ERR_CANCELED));
@@ -1092,6 +1921,9 @@ cmd_confirm (assuan_context_t ctx, char *line)
   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);
@@ -1104,17 +1936,24 @@ cmd_confirm (assuan_context_t ctx, char *line)
   if (pinentry.close_button)
     assuan_write_status (ctx, "BUTTON_INFO", "close");
 
-  if (result)
-    return 0;
+  if (result > 0)
+    return 0; /* OK */
 
   if (pinentry.specific_err)
-    return pinentry.specific_err;
+    {
+      write_status_error (ctx, &pinentry);
+
+      if (gpg_err_code (pinentry.specific_err) == GPG_ERR_FULLY_CANCELED)
+        assuan_set_flag (ctx, ASSUAN_FORCE_CLOSE, 1);
+
+      return pinentry.specific_err;
+    }
 
   if (pinentry.locale_err)
     return gpg_error (GPG_ERR_LOCALE_PROBLEM);
 
   if (pinentry.one_button)
-    return 0;
+    return 0; /* OK */
 
   if (pinentry.canceled)
     return gpg_error (GPG_ERR_CANCELED);
@@ -1130,6 +1969,33 @@ cmd_message (assuan_context_t ctx, char *line)
   return cmd_confirm (ctx, "--one-button");
 }
 
+
+/* Return a staically allocated string with information on the mode,
+ * uid, and gid of DEVICE.  On error "?" is returned if DEVICE is
+ * NULL, "-" is returned.  */
+static const char *
+device_stat_string (const char *device)
+{
+#ifdef HAVE_STAT
+  static char buf[40];
+  struct stat st;
+
+  if (!device || !*device)
+    return "-";
+
+  if (stat (device, &st))
+    return "?";  /* Error */
+  snprintf (buf, sizeof buf, "%lo/%lu/%lu",
+            (unsigned long)st.st_mode,
+            (unsigned long)st.st_uid,
+            (unsigned long)st.st_gid);
+  return buf;
+#else
+  return "-";
+#endif
+}
+
+
 /* GETINFO <what>
 
    Multipurpose function to return a variety of information.
@@ -1137,23 +2003,67 @@ cmd_message (assuan_context_t ctx, char *line)
 
      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, ttyinfo and an emacs pinentry status
  */
 static gpg_error_t
 cmd_getinfo (assuan_context_t ctx, char *line)
 {
   int rc;
+  const char *s;
+  char buffer[150];
 
   if (!strcmp (line, "version"))
     {
-      const char *s = VERSION;
+      s = VERSION;
       rc = assuan_send_data (ctx, s, strlen (s));
     }
   else if (!strcmp (line, "pid"))
     {
-      char numbuf[50];
 
-      snprintf (numbuf, sizeof numbuf, "%lu", (unsigned long)getpid ());
-      rc = assuan_send_data (ctx, numbuf, strlen (numbuf));
+      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"))
+    {
+      char emacs_status[10];
+#ifdef INSIDE_EMACS
+      snprintf (emacs_status, sizeof emacs_status,
+                "%d", pinentry_emacs_status ());
+#else
+      strcpy (emacs_status, "-");
+#endif
+      snprintf (buffer, sizeof buffer, "%s %s %s %s %lu/%lu %s",
+                pinentry.ttyname? pinentry.ttyname : "-",
+                pinentry.ttytype_l? pinentry.ttytype_l : "-",
+                pinentry.display? pinentry.display : "-",
+                device_stat_string (pinentry.ttyname),
+#ifdef HAVE_DOSISH_SYSTEM
+                0l, 0l,
+#else
+                (unsigned long)geteuid (), (unsigned long)getegid (),
+#endif
+                emacs_status
+                );
+      buffer[sizeof buffer -1] = 0;
+      rc = assuan_send_data (ctx, buffer, strlen (buffer));
     }
   else
     rc = gpg_error (GPG_ERR_ASS_PARAMETER);
@@ -1211,6 +2121,8 @@ register_commands (assuan_context_t ctx)
       { "MESSAGE",    cmd_message },
       { "SETQUALITYBAR", cmd_setqualitybar },
       { "SETQUALITYBAR_TT", cmd_setqualitybar_tt },
+      { "SETGENPIN",    cmd_setgenpin_label },
+      { "SETGENPIN_TT", cmd_setgenpin_tt },
       { "GETINFO",    cmd_getinfo },
       { "SETTITLE",   cmd_settitle },
       { "SETTIMEOUT", cmd_settimeout },
@@ -1238,8 +2150,10 @@ pinentry_loop2 (int infd, int outfd)
   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)
@@ -1270,6 +2184,9 @@ pinentry_loop2 (int infd, int outfd)
     }
 
   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 (;;)
diff --git a/pinentry/pinentry.h b/pinentry/pinentry.h
index e154ac5..d55a234 100644
--- a/pinentry/pinentry.h
+++ b/pinentry/pinentry.h
@@ -1,20 +1,21 @@
 /* pinentry.h - The interface for the PIN entry support library.
-   Copyright (C) 2002, 2003, 2010, 2015 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 <http://www.gnu.org/licenses/>.
+ * Copyright (C) 2002, 2003, 2010, 2015, 2021 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+
  */
 
 #ifndef PINENTRY_H
@@ -74,7 +75,9 @@ struct pinentry
      supported.  (Assuan: "OPTION ttyname TTYNAME".)  */
   char *ttyname;
   /* The type of the terminal.  (Assuan: "OPTION ttytype TTYTYPE".)  */
-  char *ttytype;
+  char *ttytype_l;
+  /* Set the alert mode (none, beep or flash).  */
+  char *ttyalert;
   /* The LC_CTYPE value for the terminal.  (Assuan: "OPTION lc-ctype
      LC_CTYPE".)  */
   char *lc_ctype;
@@ -91,6 +94,18 @@ struct pinentry
   /* True if caller should grab the keyboard.  (Assuan: "OPTION grab"
      or "OPTION no-grab".)  */
   int grab;
+
+  /* The PID of the owner or 0 if not known.  The owner is the process
+   * which actually triggered the the pinentry.  For example gpg.  */
+  unsigned long owner_pid;
+
+  /* The numeric uid (user ID) of the owner process or -1 if not
+   * known. */
+  int owner_uid;
+
+  /* The malloced hostname of the owner or NULL.  */
+  char *owner_host;
+
   /* The window ID of the parent window over which the pinentry window
      should be displayed.  (Assuan: "OPTION parent-wid WID".)  */
   int parent_wid;
@@ -109,7 +124,7 @@ struct pinentry
   int canceled;
 
   /* The frontend should set this to true if an error with the local
-     conversion occured. */
+     conversion occurred. */
   int locale_err;
 
   /* The frontend should set this to a gpg-error so that commands are
@@ -118,6 +133,13 @@ struct pinentry
      passphrase or a negative error code.  */
   int specific_err;
 
+  /* The frontend may store a string with the error location here.  */
+  const char *specific_err_loc;
+
+  /* The frontend may store a malloced string here to emit an ERROR
+   * status code with this extra info along with SPECIFIC_ERR.  */
+  char *specific_err_info;
+
   /* The frontend should set this to true if the window close button
      has been used.  This flag is used in addition to a regular return
      value.  */
@@ -148,10 +170,29 @@ struct pinentry
      "SETQUALITYBAR LABEL".)  */
   char *quality_bar;
 
-  /* The tooltip to be show for the qualitybar.  Malloced or NULL.
+  /* The tooltip to be shown for the qualitybar.  Malloced or NULL.
      (Assuan: "SETQUALITYBAR_TT TOOLTIP".)  */
   char *quality_bar_tt;
 
+  /* If this is not NULL, a generate action should be shown.
+     There will be an inquiry back to the caller to get such a
+     PIN. generate action.  Malloced or NULL.
+     (Assuan: "SETGENPIN LABEL" .)  */
+  char *genpin_label;
+
+  /* The tooltip to be shown for the generate action.  Malloced or NULL.
+     (Assuan: "SETGENPIN_TT TOOLTIP".)  */
+  char *genpin_tt;
+
+  /* Specifies whether passphrase formatting should be enabled.
+     (Assuan: "OPTION formatted-passphrase")  */
+  int formatted_passphrase;
+
+  /* A hint to be shown near the passphrase input field if passphrase
+     formatting is enabled.  Malloced or NULL.
+     (Assuan: "OPTION formatted-passphrase-hint=HINT".)  */
+  char *formatted_passphrase_hint;
+
   /* For the curses pinentry, the color of error messages.  */
   pinentry_color_t color_fg;
   int color_fg_bright;
@@ -171,6 +212,18 @@ struct pinentry
   /* (Assuan: "OPTION default-pwmngr
      SAVE_PASSWORD_WITH_PASSWORD_MANAGER?").  */
   char *default_pwmngr;
+  /* (Assuan: "OPTION default-cf-visi
+     Do you really want to make your passphrase visible?").  */
+  char *default_cf_visi;
+  /* (Assuan: "OPTION default-tt-visi
+     Make passphrase visible?").  */
+  char *default_tt_visi;
+  /* (Assuan: "OPTION default-tt-hide
+     Hide passphrase").  */
+  char *default_tt_hide;
+  /* (Assuan: "OPTION default-capshint
+     Caps Lock is on").  */
+  char *default_capshint;
 
   /* Whether we are allowed to read the password from an external
      cache.  (Assuan: "OPTION allow-external-password-cache")  */
@@ -189,10 +242,35 @@ struct pinentry
   /* NOTE: If you add any additional fields to this structure, be sure
      to update the initializer in pinentry/pinentry.c!!!  */
 
-  /* For the quality indicator we need to do an inquiry.  Thus we need
-     to save the assuan ctx.  */
+  /* For the quality indicator and genpin we need to do an inquiry.
+     Thus we need to save the assuan ctx.  */
   void *ctx_assuan;
 
+  /* An UTF-8 string with an invisible character used to override the
+     default in some pinentries.  Only the first character is
+     used.  */
+  char *invisible_char;
+
+  /* Whether the passphrase constraints are enforced by gpg-agent.
+     (Assuan: "OPTION constraints-enforce")  */
+  int constraints_enforce;
+
+  /* A short translated hint for the user with the constraints for new
+     passphrases to be displayed near the passphrase input field.
+     Malloced or NULL.
+     (Assuan: "OPTION constraints-hint-short=At least 8 characters".)  */
+  char *constraints_hint_short;
+
+  /* A longer translated hint for the user with the constraints for new
+     passphrases to be displayed for example as tooltip.  Malloced or NULL.
+     (Assuan: "OPTION constraints-hint-long=The passphrase must ...".)  */
+  char *constraints_hint_long;
+
+  /* A short translated title for an error dialog informing the user about
+     unsatisfied passphrase constraints.  Malloced or NULL.
+     (Assuan: "OPTION constraints-error-title=Passphrase Not Allowed".)  */
+  char *constraints_error_title;
+
 };
 typedef struct pinentry *pinentry_t;
 
@@ -201,7 +279,7 @@ typedef struct pinentry *pinentry_t;
    PIN.  If PIN->pin is zero, request a confirmation, otherwise a PIN
    entry.  On confirmation, the function should return TRUE if
    confirmed, and FALSE otherwise.  On PIN entry, the function should
-   return -1 if an error occured or the user cancelled the operation
+   return -1 if an error occurred or the user cancelled the operation
    and 1 otherwise.  */
 typedef int (*pinentry_cmd_handler_t) (pinentry_t pin);
 
@@ -227,11 +305,21 @@ char *pinentry_utf8_to_local (const char *lc_ctype, const char *text);
    Return NULL on error. */
 char *pinentry_local_to_utf8 (char *lc_ctype, char *text, int secure);
 
+char *pinentry_get_title (pinentry_t pe);
 
 /* Run a quality inquiry for PASSPHRASE of LENGTH. */
 int pinentry_inq_quality (pinentry_t pin,
                           const char *passphrase, size_t length);
 
+/* Run a checkpin inquiry for PASSPHRASE of LENGTH.  Returns NULL, if the
+   passphrase satisfies the constraints.  Otherwise, returns a malloced error
+   string. */
+char *pinentry_inq_checkpin (pinentry_t pin,
+                             const char *passphrase, size_t length);
+
+/* Run a genpin iquriry. Returns a malloced string or NULL */
+char *pinentry_inq_genpin (pinentry_t pin);
+
 /* Try to make room for at least LEN bytes for the pin in the pinentry
    PIN.  Returns new buffer on success and 0 on failure.  */
 char *pinentry_setbufferlen (pinentry_t pin, int len);
@@ -254,6 +342,10 @@ int pinentry_have_display (int argc, char **argv);
    or version output is requested.  */
 void pinentry_parse_opts (int argc, char *argv[]);
 
+/* Set the optional flag used with getinfo. */
+void pinentry_set_flavor_flag (const char *string);
+
+
 
 /* The caller must define this variable to process assuan commands.  */
 extern pinentry_cmd_handler_t pinentry_cmd_handler;