Adding upstream version 2.2.40.upstream/2.2.40upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1536 insertions, 0 deletions

diff --git a/common/homedir.c b/common/homedir.c
new file mode 100644
index 0000000..9788c22
--- /dev/null
+++ b/common/homedir.c
@@ -0,0 +1,1536 @@
+/* homedir.c - Setup the home directory.
+ * Copyright (C) 2004, 2006, 2007, 2010 Free Software Foundation, Inc.
+ * Copyright (C) 2013, 2016 Werner Koch
+ * Copyright (C) 2021 g10 Code GmbH
+ *
+ * This file is part of GnuPG.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of either
+ *
+ *   - the GNU Lesser General Public License as published by the Free
+ *     Software Foundation; either version 3 of the License, or (at
+ *     your option) any later version.
+ *
+ * or
+ *
+ *   - 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.
+ *
+ * or both in parallel, as here.
+ *
+ * This file 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: (LGPL-3.0-or-later OR GPL-2.0-or-later)
+ */
+
+#include <config.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#ifdef HAVE_W32_SYSTEM
+#include <winsock2.h>   /* Due to the stupid mingw64 requirement to
+                           include this header before windows.h which
+                           is often implicitly included.  */
+#include <shlobj.h>
+#ifndef CSIDL_APPDATA
+#define CSIDL_APPDATA 0x001a
+#endif
+#ifndef CSIDL_LOCAL_APPDATA
+#define CSIDL_LOCAL_APPDATA 0x001c
+#endif
+#ifndef CSIDL_COMMON_APPDATA
+#define CSIDL_COMMON_APPDATA 0x0023
+#endif
+#ifndef CSIDL_FLAG_CREATE
+#define CSIDL_FLAG_CREATE 0x8000
+#endif
+#endif /*HAVE_W32_SYSTEM*/
+
+#ifdef HAVE_STAT
+#include <sys/stat.h> /* for stat() */
+#endif
+
+#include "util.h"
+#include "sysutils.h"
+#include "i18n.h"
+#include "zb32.h"
+
+/* The name of the symbolic link to the file from which the process
+ * text was read.  */
+#if __linux__
+# define MYPROC_SELF_EXE "/proc/self/exe"
+#elif defined(__NetBSD__)
+# define MYPROC_SELF_EXE "/proc/curproc/exe"
+#elif defined(__illumos__) || defined(__sun)
+# define MYPROC_SELF_EXE "/proc/self/path/a.out"
+#else /* Assume other BSDs */
+# define MYPROC_SELF_EXE "/proc/curproc/file"
+#endif
+
+
+/* The GnuPG homedir.  This is only accessed by the functions
+ * gnupg_homedir and gnupg_set_homedir.  Malloced.  */
+static char *the_gnupg_homedir;
+
+/* Flag indicating that home directory is not the default one.  */
+static byte non_default_homedir;
+
+
+#ifdef HAVE_W32_SYSTEM
+/* A flag used to indicate that a control file for gpgconf has been
+ * detected.  Under Windows the presence of this file indicates a
+ * portable installations and triggers several changes:
+ *
+ * - The GNUGHOME directory is fixed relative to installation
+ *   directory.  All other means to set the home directory are ignored.
+ *
+ * - All registry variables will be ignored.
+ *
+ * This flag is not used on Unix systems.
+ */
+static byte w32_portable_app;
+#endif /*HAVE_W32_SYSTEM*/
+
+#ifdef HAVE_W32_SYSTEM
+/* This flag is true if this process' binary has been installed under
+   bin and not in the root directory as often used before GnuPG 2.1. */
+static byte w32_bin_is_bin;
+#endif /*HAVE_W32_SYSTEM*/
+
+
+#ifdef HAVE_W32_SYSTEM
+static const char *w32_rootdir (void);
+#endif
+
+
+/* This is a helper function to load and call a Windows function from
+ * either of one DLLs.  On success an UTF-8 file name is returned.
+ * ERRNO is _not_ set on error.  */
+#ifdef HAVE_W32_SYSTEM
+static char *
+w32_shgetfolderpath (HWND a, int b, HANDLE c, DWORD d)
+{
+  static int initialized;
+  static HRESULT (WINAPI * func)(HWND,int,HANDLE,DWORD,LPWSTR);
+  wchar_t wfname[MAX_PATH];
+
+  if (!initialized)
+    {
+      static char *dllnames[] = { "shell32.dll", "shfolder.dll", NULL };
+      void *handle;
+      int i;
+
+      initialized = 1;
+
+      for (i=0, handle = NULL; !handle && dllnames[i]; i++)
+        {
+          handle = dlopen (dllnames[i], RTLD_LAZY);
+          if (handle)
+            {
+              func = dlsym (handle, "SHGetFolderPathW");
+              if (!func)
+                {
+                  dlclose (handle);
+                  handle = NULL;
+                }
+            }
+        }
+    }
+
+  if (func && func (a,b,c,d,wfname) >= 0)
+    return wchar_to_utf8 (wfname);
+  else
+    return NULL;
+}
+#endif /*HAVE_W32_SYSTEM*/
+
+
+/* Check whether DIR is the default homedir.  */
+static int
+is_gnupg_default_homedir (const char *dir)
+{
+  int result;
+  char *a = make_absfilename (dir, NULL);
+  char *b = make_absfilename (standard_homedir (), NULL);
+  result = !compare_filenames (a, b);
+  xfree (b);
+  xfree (a);
+  return result;
+}
+
+
+/* Helper to remove trailing slashes from NEWDIR.  Return a new
+ * allocated string if that has been done or NULL if there are no
+ * slashes to remove.  Also inserts a missing slash after a Windows
+ * drive letter.  */
+static char *
+copy_dir_with_fixup (const char *newdir)
+{
+  char *result = NULL;
+  char *p;
+
+  if (!*newdir)
+    return NULL;
+
+#ifdef HAVE_W32_SYSTEM
+  if (newdir[0] && newdir[1] == ':'
+      && !(newdir[2] == '/' || newdir[2] == '\\'))
+    {
+      /* Drive letter with missing leading slash.  */
+      p = result = xmalloc (strlen (newdir) + 1 + 1);
+      *p++ = newdir[0];
+      *p++ = newdir[1];
+      *p++ = '\\';
+      strcpy (p, newdir+2);
+
+      /* Remove trailing slashes.  */
+      p = result + strlen (result) - 1;
+      while (p > result+2 && (*p == '/' || *p == '\\'))
+        *p-- = 0;
+    }
+  else if (newdir[strlen (newdir)-1] == '/'
+           || newdir[strlen (newdir)-1] == '\\' )
+    {
+      result = xstrdup (newdir);
+      p = result + strlen (result) - 1;
+      while (p > result
+             && (*p == '/' || *p == '\\')
+             && (p-1 > result && p[-1] != ':')) /* We keep "c:/". */
+        *p-- = 0;
+    }
+
+#else /*!HAVE_W32_SYSTEM*/
+
+  if (newdir[strlen (newdir)-1] == '/')
+    {
+      result = xstrdup (newdir);
+      p = result + strlen (result) - 1;
+      while (p > result && *p == '/')
+        *p-- = 0;
+    }
+
+#endif /*!HAVE_W32_SYSTEM*/
+
+  return result;
+}
+
+
+/* Get the standard home directory.  In general this function should
+   not be used as it does not consider a registry value (under W32) or
+   the GNUPGHOME environment variable.  It is better to use
+   default_homedir(). */
+const char *
+standard_homedir (void)
+{
+#ifdef HAVE_W32_SYSTEM
+  static const char *dir;
+
+  if (!dir)
+    {
+      const char *rdir;
+
+      rdir = w32_rootdir ();
+      if (w32_portable_app)
+        {
+          dir = xstrconcat (rdir, DIRSEP_S "home", NULL);
+        }
+      else
+        {
+          char *path;
+
+          path = w32_shgetfolderpath (NULL, CSIDL_APPDATA|CSIDL_FLAG_CREATE,
+                                      NULL, 0);
+          if (path)
+            {
+              dir = xstrconcat (path, "\\gnupg", NULL);
+              xfree (path);
+
+              /* Try to create the directory if it does not yet exists.  */
+              if (gnupg_access (dir, F_OK))
+                gnupg_mkdir (dir, "-rwx");
+            }
+          else
+            dir = GNUPG_DEFAULT_HOMEDIR;
+        }
+    }
+  return dir;
+#else/*!HAVE_W32_SYSTEM*/
+  return GNUPG_DEFAULT_HOMEDIR;
+#endif /*!HAVE_W32_SYSTEM*/
+}
+
+/* Set up the default home directory.  The usual --homedir option
+   should be parsed later. */
+const char *
+default_homedir (void)
+{
+  const char *dir;
+
+#ifdef HAVE_W32_SYSTEM
+  /* For a portable application we only use the standard homedir.  */
+  w32_rootdir ();
+  if (w32_portable_app)
+    return standard_homedir ();
+#endif /*HAVE_W32_SYSTEM*/
+
+  dir = getenv ("GNUPGHOME");
+#ifdef HAVE_W32_SYSTEM
+  if (!dir || !*dir)
+    {
+      static const char *saved_dir;
+
+      if (!saved_dir)
+        {
+          if (!dir || !*dir)
+            {
+              char *tmp, *p;
+
+              /* This is deprecated; gpgconf --list-dirs prints a
+               * warning if the homedir has been taken from the
+               * registry.  */
+              tmp = read_w32_registry_string (NULL,
+                                              GNUPG_REGISTRY_DIR,
+                                              "HomeDir");
+              if (tmp && !*tmp)
+                {
+                  xfree (tmp);
+                  tmp = NULL;
+                }
+              if (tmp)
+                {
+                  /* Strip trailing backslashes.  */
+                  p = tmp + strlen (tmp) - 1;
+                  while (p > tmp && *p == '\\')
+                    *p-- = 0;
+                  saved_dir = tmp;
+                }
+            }
+
+          if (!saved_dir)
+            saved_dir = standard_homedir ();
+        }
+      dir = saved_dir;
+    }
+#endif /*HAVE_W32_SYSTEM*/
+
+  if (!dir || !*dir)
+    dir = GNUPG_DEFAULT_HOMEDIR;
+  else
+    {
+      char *p;
+
+      p = copy_dir_with_fixup (dir);
+      if (p)
+        dir = p;
+
+      if (!is_gnupg_default_homedir (dir))
+        non_default_homedir = 1;
+    }
+
+  return dir;
+}
+
+
+#ifdef HAVE_W32_SYSTEM
+/* Check whether gpgconf is installed and if so read the gpgconf.ctl
+   file. */
+static void
+check_portable_app (const char *dir)
+{
+  char *fname;
+
+  fname = xstrconcat (dir, DIRSEP_S "gpgconf.exe", NULL);
+  if (!gnupg_access (fname, F_OK))
+    {
+      strcpy (fname + strlen (fname) - 3, "ctl");
+      if (!gnupg_access (fname, F_OK))
+        {
+          /* gpgconf.ctl file found.  Record this fact.  */
+          w32_portable_app = 1;
+          {
+            unsigned int flags;
+            log_get_prefix (&flags);
+            log_set_prefix (NULL, (flags | GPGRT_LOG_NO_REGISTRY));
+          }
+          /* FIXME: We should read the file to detect special flags
+             and print a warning if we don't understand them  */
+        }
+    }
+  xfree (fname);
+}
+#endif /*HAVE_W32_SYSTEM*/
+
+
+#ifdef HAVE_W32_SYSTEM
+/* Determine the root directory of the gnupg installation on Windows.  */
+static const char *
+w32_rootdir (void)
+{
+  static int got_dir;
+  static char dir[MAX_PATH+5];
+
+  if (!got_dir)
+    {
+      char *p;
+      int rc;
+      wchar_t wdir [MAX_PATH+5];
+
+      rc = GetModuleFileNameW (NULL, wdir, MAX_PATH);
+      if (rc && WideCharToMultiByte (CP_UTF8, 0, wdir, -1, dir, MAX_PATH-4,
+                                     NULL, NULL) < 0)
+        rc = 0;
+      if (!rc)
+        {
+          log_debug ("GetModuleFileName failed: %s\n", w32_strerror (-1));
+          *dir = 0;
+        }
+      got_dir = 1;
+      p = strrchr (dir, DIRSEP_C);
+      if (p)
+        {
+          *p = 0;
+
+          check_portable_app (dir);
+
+          /* If we are installed below "bin" we strip that and use
+             the top directory instead.  */
+          p = strrchr (dir, DIRSEP_C);
+          if (p && !strcmp (p+1, "bin"))
+            {
+              *p = 0;
+              w32_bin_is_bin = 1;
+            }
+        }
+      if (!p)
+        {
+          log_debug ("bad filename '%s' returned for this process\n", dir);
+          *dir = 0;
+        }
+    }
+
+  if (*dir)
+    return dir;
+  /* Fallback to the hardwired value. */
+  return GNUPG_LIBEXECDIR;
+}
+#endif /*HAVE_W32_SYSTEM*/
+
+
+#ifndef HAVE_W32_SYSTEM /* Unix */
+/* Determine the root directory of the gnupg installation on Unix.
+ * The standard case is that this function returns NULL so that the
+ * root directory as configured at build time is used.  However, it
+ * may return a static string with a different root directory, similar
+ * to what we do on Windows.  That second mode is triggered by the
+ * existence of a file gpgconf.ctl installed side-by-side to gpgconf.
+ * This file is parsed for keywords describing the actually to be used
+ * root directory.  There is no solid standard on Unix to locate the
+ * binary used to create the process, thus we support this currently
+ * only on Linux and BSD where we can look this info up using the proc
+ * file system.  If WANT_SYSCONFDIR is true the optional sysconfdir
+ * entry is returned.  */
+static const char *
+unix_rootdir (int want_sysconfdir)
+{
+  static int checked;
+  static char *dir;   /* for the rootdir  */
+  static char *sdir;  /* for the sysconfdir */
+
+  if (!checked)
+    {
+      char *p;
+      char *buffer;
+      size_t bufsize = 256-1;
+      int nread;
+      gpg_error_t err;
+      char *line;
+      size_t linelen;
+      ssize_t length;
+      estream_t fp;
+      char *rootdir;
+      char *sysconfdir;
+      const char *name;
+
+      for (;;)
+        {
+          buffer = xmalloc (bufsize+1);
+          nread = readlink (MYPROC_SELF_EXE, buffer, bufsize);
+          if (nread < 0)
+            {
+              err = gpg_error_from_syserror ();
+              buffer[0] = 0;
+              if ((name = getenv ("GNUPG_BUILD_ROOT")) && *name == '/')
+                {
+                  /* Try a fallback for systems w/o a supported /proc
+                   * file system if we are running a regression test.  */
+                  log_info ("error reading symlink '%s': %s\n",
+                            MYPROC_SELF_EXE, gpg_strerror (err));
+                  xfree  (buffer);
+                  buffer = xstrconcat (name, "/bin/gpgconf", NULL);
+                  log_info ("trying fallback '%s'\n", buffer);
+                }
+              break;
+            }
+          else if (nread < bufsize)
+            {
+              buffer[nread] = 0;
+              break;  /* Got it.  */
+            }
+          else if (bufsize >= 4095)
+            {
+              buffer[0] = 0;
+              log_info ("error reading symlink '%s': %s\n",
+                        MYPROC_SELF_EXE, "value too large");
+              break;
+            }
+          xfree (buffer);
+          bufsize += 256;
+        }
+      if (!*buffer)
+        {
+          xfree (buffer);
+          checked = 1;
+          return NULL;  /* Error - assume no gpgconf.ctl.  */
+        }
+
+      p = strrchr (buffer, '/');
+      if (!p)
+        {
+          xfree (buffer);
+          checked = 1;
+          return NULL;  /* Erroneous /proc - assume no gpgconf.ctl.  */
+        }
+      *p = 0;  /* BUFFER has the directory.  */
+      if ((p = strrchr (buffer, '/')))
+        {
+          /* Strip one part and expect the file below a bin dir.  */
+          *p = 0;
+          p = xstrconcat (buffer, "/bin/gpgconf.ctl", NULL);
+          xfree (buffer);
+          buffer = p;
+        }
+      else /* !p */
+        {
+          /* Installed in the root which is not a good idea.  Assume
+           * no gpgconf.ctl.  */
+          xfree (buffer);
+          checked = 1;
+          return NULL;
+        }
+
+      if (gnupg_access (buffer, F_OK))
+        {
+          /* No gpgconf.ctl file.  */
+          xfree (buffer);
+          checked = 1;
+          return NULL;
+        }
+      /* log_info ("detected '%s'\n", buffer); */
+      fp = es_fopen (buffer, "r");
+      if (!fp)
+        {
+          err = gpg_error_from_syserror ();
+          log_info ("error opening '%s': %s\n", buffer, gpg_strerror (err));
+          xfree (buffer);
+          checked = 1;
+          return NULL;
+        }
+
+      line = NULL;
+      linelen = 0;
+      rootdir = NULL;
+      sysconfdir = NULL;
+      while ((length = es_read_line (fp, &line, &linelen, NULL)) > 0)
+        {
+          /* Strip NL and CR, if present.  */
+          while (length > 0
+                 && (line[length - 1] == '\n' || line[length - 1] == '\r'))
+            line[--length] = 0;
+          trim_spaces (line);
+          if (!strncmp (line, "rootdir=", 8))
+            {
+              name = "rootdir";
+              p = line + 8;
+            }
+          else if (!strncmp (line, "rootdir =", 9))  /* (What a kludge) */
+            {
+              name = "rootdir";
+              p = line + 9;
+            }
+          else if (!strncmp (line, "sysconfdir=", 11))
+            {
+              name = "sysconfdir";
+              p = line + 11;
+            }
+          else if (!strncmp (line, "sysconfdir =", 12))  /* (What a kludge) */
+            {
+              name = "sysconfdir";
+              p = line + 12;
+            }
+          else
+            continue;
+          trim_spaces (p);
+          p = substitute_envvars (p);
+          if (!p)
+            {
+              err = gpg_error_from_syserror ();
+              log_info ("error getting %s from gpgconf.ctl: %s\n",
+                        name, gpg_strerror (err));
+            }
+          else if (!strcmp (name, "sysconfdir"))
+            {
+              xfree (sysconfdir);
+              sysconfdir = p;
+            }
+          else
+            {
+              xfree (rootdir);
+              rootdir = p;
+            }
+        }
+      if (es_ferror (fp))
+        {
+          err = gpg_error_from_syserror ();
+          log_info ("error reading '%s': %s\n", buffer, gpg_strerror (err));
+          es_fclose (fp);
+          xfree (buffer);
+          xfree (line);
+          checked = 1;
+          return NULL;
+        }
+      es_fclose (fp);
+      xfree (buffer);
+      xfree (line);
+
+      if (!rootdir || !*rootdir || *rootdir != '/')
+        {
+          log_info ("invalid rootdir '%s' specified in gpgconf.ctl\n", rootdir);
+          xfree (rootdir);
+          xfree (sysconfdir);
+          dir = NULL;
+        }
+      else if (sysconfdir && (!*sysconfdir || *sysconfdir != '/'))
+        {
+          log_info ("invalid sysconfdir '%s' specified in gpgconf.ctl\n",
+                    sysconfdir);
+          xfree (rootdir);
+          xfree (sysconfdir);
+          dir = NULL;
+        }
+      else
+        {
+          while (*rootdir && rootdir[strlen (rootdir)-1] == '/')
+            rootdir[strlen (rootdir)-1] = 0;
+          dir = rootdir;
+          gpgrt_annotate_leaked_object (dir);
+          /* log_info ("want rootdir '%s'\n", dir); */
+          if (sysconfdir)
+            {
+              while (*sysconfdir && sysconfdir[strlen (sysconfdir)-1] == '/')
+                sysconfdir[strlen (sysconfdir)-1] = 0;
+              sdir = sysconfdir;
+              gpgrt_annotate_leaked_object (sdir);
+              /* log_info ("want sysconfdir '%s'\n", sdir); */
+            }
+        }
+      checked = 1;
+    }
+
+  return want_sysconfdir? sdir : dir;
+}
+#endif /* Unix */
+
+
+#ifdef HAVE_W32_SYSTEM
+static const char *
+w32_commondir (void)
+{
+  static char *dir;
+
+  if (!dir)
+    {
+      const char *rdir;
+      char *path;
+
+      /* Make sure that w32_rootdir has been called so that we are
+         able to check the portable application flag.  The common dir
+         is the identical to the rootdir.  In that case there is also
+         no need to strdup its value.  */
+      rdir = w32_rootdir ();
+      if (w32_portable_app)
+        return rdir;
+
+      path = w32_shgetfolderpath (NULL, CSIDL_COMMON_APPDATA, NULL, 0);
+      if (path)
+        {
+          dir = xstrconcat (path, "\\GNU", NULL);
+          /* No auto create of the directory.  Either the installer or
+           * the admin has to create these directories.  */
+        }
+      else
+        {
+          /* Folder not found or defined - probably an old Windows
+           * version.  Use the installation directory instead.  */
+          dir = xstrdup (rdir);
+        }
+    }
+
+  return dir;
+}
+#endif /*HAVE_W32_SYSTEM*/
+
+
+/* Change the homedir.  Some care must be taken to set this early
+ * enough because previous calls to gnupg_homedir may else return a
+ * different string.  */
+void
+gnupg_set_homedir (const char *newdir)
+{
+  char *tmp = NULL;
+
+  if (!newdir || !*newdir)
+    newdir = default_homedir ();
+  else
+    {
+      tmp = copy_dir_with_fixup (newdir);
+      if (tmp)
+        newdir = tmp;
+
+      if (!is_gnupg_default_homedir (newdir))
+        non_default_homedir = 1;
+    }
+  xfree (the_gnupg_homedir);
+  the_gnupg_homedir = make_absfilename (newdir, NULL);;
+  xfree (tmp);
+}
+
+
+/* Create the homedir directory only if the supplied directory name is
+ * the same as the default one.  This way we avoid to create arbitrary
+ * directories when a non-default home directory is used.  To cope
+ * with HOME, we do compare only the suffix if we see that the default
+ * homedir does start with a tilde.  If the mkdir fails the function
+ * terminates the process.  If QUIET is set not diagnostic is printed
+ * on homedir creation.  */
+void
+gnupg_maybe_make_homedir (const char *fname, int quiet)
+{
+  const char *defhome = standard_homedir ();
+
+  if (
+#ifdef HAVE_W32_SYSTEM
+      ( !compare_filenames (fname, defhome) )
+#else
+      ( *defhome == '~'
+        && (strlen(fname) >= strlen (defhome+1)
+            && !strcmp(fname+strlen(fname)-strlen(defhome+1), defhome+1 ) ))
+      || (*defhome != '~'  && !compare_filenames( fname, defhome ) )
+#endif
+      )
+    {
+      if (gnupg_mkdir (fname, "-rwx"))
+        log_fatal ( _("can't create directory '%s': %s\n"),
+                    fname, strerror(errno) );
+      else if (!quiet )
+        log_info ( _("directory '%s' created\n"), fname );
+    }
+}
+
+
+/* Return the homedir.  The returned string is valid until another
+ * gnupg-set-homedir call.  This is always an absolute directory name.
+ * The function replaces the former global var opt.homedir.  */
+const char *
+gnupg_homedir (void)
+{
+  /* If a homedir has not been set, set it to the default.  */
+  if (!the_gnupg_homedir)
+    the_gnupg_homedir = make_absfilename (default_homedir (), NULL);
+  return the_gnupg_homedir;
+}
+
+
+/* Return whether the home dir is the default one.  */
+int
+gnupg_default_homedir_p (void)
+{
+  return !non_default_homedir;
+}
+
+
+/* Return the directory name used by daemons for their current working
+ * directory.  */
+const char *
+gnupg_daemon_rootdir (void)
+{
+#ifdef HAVE_W32_SYSTEM
+  static char *name;
+
+  if (!name)
+    {
+      char path[MAX_PATH];
+      size_t n;
+
+      n = GetSystemDirectoryA (path, sizeof path);
+      if (!n || n >= sizeof path)
+        name = xstrdup ("/"); /* Error - use the curret top dir instead.  */
+      else
+        name = xstrdup (path);
+    }
+
+  return name;
+
+#else /*!HAVE_W32_SYSTEM*/
+  return "/";
+#endif /*!HAVE_W32_SYSTEM*/
+}
+
+
+/* Helper for gnupg-socketdir.  This is a global function, so that
+ * gpgconf can use it for its --create-socketdir command.  If
+ * SKIP_CHECKS is set permission checks etc. are not done.  The
+ * function always returns a malloced directory name and stores these
+ * bit flags at R_INFO:
+ *
+ *   1 := Internal error, stat failed, out of core, etc.
+ *   2 := No /run/user directory.
+ *   4 := Directory not owned by the user, not a directory
+ *        or wrong permissions.
+ *   8 := Same as 4 but for the subdir.
+ *  16 := mkdir failed
+ *  32 := Non default homedir; checking subdir.
+ *  64 := Subdir does not exist.
+ * 128 := Using homedir as fallback.
+ */
+char *
+_gnupg_socketdir_internal (int skip_checks, unsigned *r_info)
+{
+#if defined(HAVE_W32_SYSTEM)
+  char *name;
+
+  (void)skip_checks;
+
+  *r_info = 0;
+
+  /* First make sure that non_default_homedir and w32_portable_app can
+   * be set.  */
+  gnupg_homedir ();
+
+  if (w32_portable_app)
+    {
+      name = xstrconcat (w32_rootdir (), DIRSEP_S, "gnupg", NULL);
+    }
+  else
+    {
+      char *path;
+
+      path = w32_shgetfolderpath (NULL,
+                                  CSIDL_LOCAL_APPDATA|CSIDL_FLAG_CREATE,
+                                  NULL, 0);
+      if (path)
+        {
+          name = xstrconcat (path, "\\gnupg", NULL);
+          xfree (path);
+          if (gnupg_access (name, F_OK))
+            gnupg_mkdir (name, "-rwx");
+        }
+      else
+        {
+          name = xstrdup (gnupg_homedir ());
+        }
+    }
+
+  /* If a non default homedir is used, we check whether an
+   * corresponding sub directory below the socket dir is available
+   * and use that.  We hash the non default homedir to keep the new
+   * subdir short enough.  */
+  if (non_default_homedir)
+    {
+      char sha1buf[20];
+      struct stat sb;
+      char *suffix;
+      char *p;
+
+      *r_info |= 32; /* Testing subdir.  */
+
+      /* Canonicalize the name to avoid problems with mixed case
+       * names.  Note that we use only 10 bytes of the hash because on
+       * Windows the account name is also part of the name.  */
+      suffix = ascii_strlwr (xstrdup (gnupg_homedir ()));
+      for (p=suffix; *p; p++)
+        if ( *p == '\\')
+          *p = '/';
+      gcry_md_hash_buffer (GCRY_MD_SHA1, sha1buf, suffix, strlen (suffix));
+      xfree (suffix);
+      suffix = zb32_encode (sha1buf, 8*10);
+      if (!suffix)
+        {
+          *r_info |= 1; /* Out of core etc. */
+          goto leave_w32;
+        }
+      p = xstrconcat (name, "\\d.", suffix, NULL);
+      xfree (suffix);
+      xfree (name);
+      name = p;
+
+      /* Stat that directory and check constraints.
+       * The command
+       *    gpgconf --remove-socketdir
+       * can be used to remove that directory.  */
+      if (gnupg_stat (name, &sb))
+        {
+          if (errno != ENOENT)
+            *r_info |= 1; /* stat failed. */
+          else if (!skip_checks)
+            {
+              /* Try to create the directory and check again.  */
+              if (gnupg_mkdir (name, "-rwx"))
+                *r_info |= 16; /* mkdir failed.  */
+              else if (gnupg_stat (name, &sb))
+                {
+                  if (errno != ENOENT)
+                    *r_info |= 1; /* stat failed. */
+                  else
+                    *r_info |= 64; /* Subdir does not exist.  */
+                }
+              else
+                goto leave_w32; /* Success!  */
+            }
+          else
+            *r_info |= 64; /* Subdir does not exist.  */
+          if (!skip_checks)
+            {
+              xfree (name);
+              name = NULL;
+              goto leave_w32;
+            }
+        }
+    }
+
+ leave_w32:
+  /* If nothing works - fall back to the homedir.  */
+  if (!name)
+    {
+      *r_info |= 128; /* Fallback.  */
+      name = xstrdup (gnupg_homedir ());
+    }
+
+#elif !defined(HAVE_STAT)
+  char *name;
+
+  (void)skip_checks;
+  *r_info = 0;
+  name = xstrdup (gnupg_homedir ());
+
+#else /* Unix and stat(2) available. */
+
+  static const char * const bases[] = {
+#ifdef USE_RUN_GNUPG_USER_SOCKET
+    "/run/gnupg",
+#endif
+    "/run",
+#ifdef USE_RUN_GNUPG_USER_SOCKET
+    "/var/run/gnupg",
+#endif
+    "/var/run",
+    NULL
+  };
+  int i;
+  struct stat sb;
+  char prefix[19 + 1 + 20 + 6 + 1];
+  const char *s;
+  char *name = NULL;
+
+  *r_info = 0;
+
+  /* First make sure that non_default_homedir can be set.  */
+  gnupg_homedir ();
+
+  /* It has been suggested to first check XDG_RUNTIME_DIR envvar.
+   * However, the specs state that the lifetime of the directory MUST
+   * be bound to the user being logged in.  Now GnuPG may also be run
+   * as a background process with no (desktop) user logged in.  Thus
+   * we better don't do that.  */
+
+  /* Check whether we have a /run/[gnupg/]user dir.  */
+  for (i=0; bases[i]; i++)
+    {
+      snprintf (prefix, sizeof prefix, "%s/user/%u",
+                bases[i], (unsigned int)getuid ());
+      if (!stat (prefix, &sb) && S_ISDIR(sb.st_mode))
+        break;
+    }
+  if (!bases[i])
+    {
+      *r_info |= 2; /* No /run/user directory.  */
+      goto leave;
+    }
+
+  if (sb.st_uid != getuid ())
+    {
+      *r_info |= 4; /* Not owned by the user.  */
+      if (!skip_checks)
+        goto leave;
+    }
+
+  if (strlen (prefix) + 7 >= sizeof prefix)
+    {
+      *r_info |= 1; /* Ooops: Buffer too short to append "/gnupg".  */
+      goto leave;
+    }
+  strcat (prefix, "/gnupg");
+
+  /* Check whether the gnupg sub directory has proper permissions.  */
+  if (stat (prefix, &sb))
+    {
+      if (errno != ENOENT)
+        {
+          *r_info |= 1; /* stat failed.  */
+          goto leave;
+        }
+
+      /* Try to create the directory and check again.  */
+      if (gnupg_mkdir (prefix, "-rwx"))
+        {
+          *r_info |= 16; /* mkdir failed.  */
+          goto leave;
+        }
+      if (stat (prefix, &sb))
+        {
+          *r_info |= 1; /* stat failed.  */
+          goto leave;
+        }
+    }
+  /* Check that it is a directory, owned by the user, and only the
+   * user has permissions to use it.  */
+  if (!S_ISDIR(sb.st_mode)
+      || sb.st_uid != getuid ()
+      || (sb.st_mode & (S_IRWXG|S_IRWXO)))
+    {
+      *r_info |= 4; /* Bad permissions or not a directory. */
+      if (!skip_checks)
+        goto leave;
+    }
+
+  /* If a non default homedir is used, we check whether an
+   * corresponding sub directory below the socket dir is available
+   * and use that.  We hash the non default homedir to keep the new
+   * subdir short enough.  */
+  if (non_default_homedir)
+    {
+      char sha1buf[20];
+      char *suffix;
+
+      *r_info |= 32; /* Testing subdir.  */
+      s = gnupg_homedir ();
+      gcry_md_hash_buffer (GCRY_MD_SHA1, sha1buf, s, strlen (s));
+      suffix = zb32_encode (sha1buf, 8*15);
+      if (!suffix)
+        {
+          *r_info |= 1; /* Out of core etc. */
+          goto leave;
+        }
+      name = strconcat (prefix, "/d.", suffix, NULL);
+      xfree (suffix);
+      if (!name)
+        {
+          *r_info |= 1; /* Out of core etc. */
+          goto leave;
+        }
+
+      /* Stat that directory and check constraints.
+       * The command
+       *    gpgconf --remove-socketdir
+       * can be used to remove that directory.  */
+      if (stat (name, &sb))
+        {
+          if (errno != ENOENT)
+            *r_info |= 1; /* stat failed. */
+          else if (!skip_checks)
+            {
+              /* Try to create the directory and check again.  */
+              if (gnupg_mkdir (name, "-rwx"))
+                *r_info |= 16; /* mkdir failed.  */
+              else if (stat (prefix, &sb))
+                {
+                  if (errno != ENOENT)
+                    *r_info |= 1; /* stat failed. */
+                  else
+                    *r_info |= 64; /* Subdir does not exist.  */
+                }
+              else
+                goto leave; /* Success!  */
+            }
+          else
+            *r_info |= 64; /* Subdir does not exist.  */
+          if (!skip_checks)
+            {
+              xfree (name);
+              name = NULL;
+              goto leave;
+            }
+        }
+      else if (!S_ISDIR(sb.st_mode)
+               || sb.st_uid != getuid ()
+               || (sb.st_mode & (S_IRWXG|S_IRWXO)))
+        {
+          *r_info |= 8; /* Bad permissions or subdir is not a directory.  */
+          if (!skip_checks)
+            {
+              xfree (name);
+              name = NULL;
+              goto leave;
+            }
+        }
+    }
+  else
+    name = xstrdup (prefix);
+
+ leave:
+  /* If nothing works fall back to the homedir.  */
+  if (!name)
+    {
+      *r_info |= 128; /* Fallback.  */
+      name = xstrdup (gnupg_homedir ());
+    }
+
+#endif /* Unix */
+
+  return name;
+}
+
+
+/*
+ * Return the name of the socket dir.  That is the directory used for
+ * the IPC local sockets.  This is an absolute directory name.
+ */
+const char *
+gnupg_socketdir (void)
+{
+  static char *name;
+
+  if (!name)
+    {
+      unsigned int dummy;
+      name = _gnupg_socketdir_internal (0, &dummy);
+    }
+
+  return name;
+}
+
+
+/* Return the name of the sysconfdir.  This is a static string.  This
+   function is required because under Windows we can't simply compile
+   it in.  */
+const char *
+gnupg_sysconfdir (void)
+{
+#ifdef HAVE_W32_SYSTEM
+  static char *name;
+
+  if (!name)
+    {
+      const char *s1, *s2;
+      s1 = w32_commondir ();
+      s2 = DIRSEP_S "etc" DIRSEP_S "gnupg";
+      name = xmalloc (strlen (s1) + strlen (s2) + 1);
+      strcpy (stpcpy (name, s1), s2);
+    }
+  return name;
+#else /*!HAVE_W32_SYSTEM*/
+  const char *dir = unix_rootdir (1);
+  if (dir)
+    return dir;
+  else
+    return GNUPG_SYSCONFDIR;
+#endif /*!HAVE_W32_SYSTEM*/
+}
+
+
+const char *
+gnupg_bindir (void)
+{
+  static char *name;
+  const char *rdir;
+
+#if defined(HAVE_W32_SYSTEM)
+  rdir = w32_rootdir ();
+  if (w32_bin_is_bin)
+    {
+      if (!name)
+        name = xstrconcat (rdir, DIRSEP_S "bin", NULL);
+      return name;
+    }
+  else
+    return rdir;
+#else /*!HAVE_W32_SYSTEM*/
+  rdir = unix_rootdir (0);
+  if (rdir)
+    {
+      if (!name)
+        {
+          name = xstrconcat (rdir, DIRSEP_S "bin", NULL);
+          gpgrt_annotate_leaked_object (name);
+        }
+      return name;
+    }
+  else
+    return GNUPG_BINDIR;
+#endif /*!HAVE_W32_SYSTEM*/
+}
+
+
+/* Return the name of the libexec directory.  The name is allocated in
+   a static area on the first use.  This function won't fail. */
+const char *
+gnupg_libexecdir (void)
+{
+#ifdef HAVE_W32_SYSTEM
+  return gnupg_bindir ();
+#else /*!HAVE_W32_SYSTEM*/
+  static char *name;
+  const char *rdir;
+
+  rdir = unix_rootdir (0);
+  if (rdir)
+    {
+      if (!name)
+        {
+          name = xstrconcat (rdir, DIRSEP_S "libexec", NULL);
+          gpgrt_annotate_leaked_object (name);
+        }
+      return name;
+    }
+  else
+    return GNUPG_LIBEXECDIR;
+#endif /*!HAVE_W32_SYSTEM*/
+}
+
+const char *
+gnupg_libdir (void)
+{
+  static char *name;
+
+#ifdef HAVE_W32_SYSTEM
+  if (!name)
+    name = xstrconcat (w32_rootdir (), DIRSEP_S "lib" DIRSEP_S "gnupg", NULL);
+  return name;
+#else /*!HAVE_W32_SYSTEM*/
+  const char *rdir;
+
+  rdir = unix_rootdir (0);
+  if (rdir)
+    {
+      if (!name)
+        {
+          name = xstrconcat (rdir, DIRSEP_S "lib", DIRSEP_S, "gnupg", NULL);
+          gpgrt_annotate_leaked_object (name);
+        }
+      return name;
+    }
+  else
+    return GNUPG_LIBDIR;
+#endif /*!HAVE_W32_SYSTEM*/
+}
+
+const char *
+gnupg_datadir (void)
+{
+  static char *name;
+
+#ifdef HAVE_W32_SYSTEM
+  if (!name)
+    name = xstrconcat (w32_rootdir (), DIRSEP_S "share" DIRSEP_S "gnupg", NULL);
+  return name;
+#else /*!HAVE_W32_SYSTEM*/
+  const char *rdir;
+
+  rdir = unix_rootdir (0);
+  if (rdir)
+    {
+      if (!name)
+        {
+          name = xstrconcat (rdir, DIRSEP_S "share" DIRSEP_S "gnupg", NULL);
+          gpgrt_annotate_leaked_object (name);
+        }
+      return name;
+    }
+  else
+    return GNUPG_DATADIR;
+#endif /*!HAVE_W32_SYSTEM*/
+}
+
+
+const char *
+gnupg_localedir (void)
+{
+  static char *name;
+
+#ifdef HAVE_W32_SYSTEM
+  if (!name)
+    name = xstrconcat (w32_rootdir (), DIRSEP_S "share" DIRSEP_S "locale",
+                       NULL);
+  return name;
+#else /*!HAVE_W32_SYSTEM*/
+  const char *rdir;
+
+  rdir = unix_rootdir (0);
+  if (rdir)
+    {
+      if (!name)
+        {
+          name = xstrconcat (rdir, DIRSEP_S "share" DIRSEP_S "locale", NULL);
+          gpgrt_annotate_leaked_object (name);
+        }
+      return name;
+    }
+  else
+    return LOCALEDIR;
+#endif /*!HAVE_W32_SYSTEM*/
+}
+
+
+/* Return the standard socket name used by gpg-agent.  */
+const char *
+gpg_agent_socket_name (void)
+{
+  static char *name;
+
+  if (!name)
+    {
+      name = make_filename (gnupg_socketdir (), GPG_AGENT_SOCK_NAME, NULL);
+      gpgrt_annotate_leaked_object (name);
+    }
+  return name;
+}
+
+
+/* Return the user socket name used by DirMngr.  */
+const char *
+dirmngr_socket_name (void)
+{
+  static char *name;
+
+  if (!name)
+    name = make_filename (gnupg_socketdir (), DIRMNGR_SOCK_NAME, NULL);
+  return name;
+}
+
+
+/* Return the default pinentry name.  If RESET is true the internal
+   cache is first flushed.  */
+static const char *
+get_default_pinentry_name (int reset)
+{
+  static struct {
+    const char *(*rfnc)(void);
+    const char *name;
+  } names[] = {
+    /* The first entry is what we return in case we found no
+       other pinentry.  */
+    { gnupg_bindir, DIRSEP_S "pinentry" EXEEXT_S },
+#ifdef HAVE_W32_SYSTEM
+    /* Try Gpg4win directory (with bin and without.) */
+    { w32_rootdir, "\\..\\Gpg4win\\bin\\pinentry.exe" },
+    { w32_rootdir, "\\..\\Gpg4win\\pinentry.exe" },
+    /* Try a pinentry in a dir above us */
+    { w32_rootdir, "\\..\\bin\\pinentry.exe" },
+    /* Try old Gpgwin directory.  */
+    { w32_rootdir, "\\..\\GNU\\GnuPG\\pinentry.exe" },
+    /* Try a Pinentry from the common GNU dir.  */
+    { w32_rootdir, "\\..\\GNU\\bin\\pinentry.exe" },
+#endif
+    /* Last chance is a pinentry-basic (which comes with the
+       GnuPG 2.1 Windows installer).  */
+    { gnupg_bindir, DIRSEP_S "pinentry-basic" EXEEXT_S }
+  };
+  static char *name;
+
+  if (reset)
+    {
+      xfree (name);
+      name = NULL;
+    }
+
+  if (!name)
+    {
+      int i;
+
+      for (i=0; i < DIM(names); i++)
+        {
+          char *name2;
+
+          name2 = xstrconcat (names[i].rfnc (), names[i].name, NULL);
+          if (!gnupg_access (name2, F_OK))
+            {
+              /* Use that pinentry.  */
+              xfree (name);
+              name = name2;
+              break;
+            }
+          if (!i) /* Store the first as fallback return.  */
+            name = name2;
+          else
+            xfree (name2);
+        }
+    }
+
+  return name;
+}
+
+
+/* If set, 'gnupg_module_name' returns modules from that build
+ * directory.  */
+static char *gnupg_build_directory;
+
+/* For sanity checks.  */
+static int gnupg_module_name_called;
+
+
+/* Set NEWDIR as the new build directory.  This will make
+ * 'gnupg_module_name' return modules from that build directory.  Must
+ * be called before any invocation of 'gnupg_module_name', and must
+ * not be called twice.  It can be used by test suites to make sure
+ * the components from the build directory are used instead of
+ * potentially outdated installed ones.
+ * Fixme: It might be better to make use of the newer gpgconf.ctl feature
+ *        for regression testing.
+ */
+void
+gnupg_set_builddir (const char *newdir)
+{
+  log_assert (! gnupg_module_name_called);
+  log_assert (! gnupg_build_directory);
+  gnupg_build_directory = xtrystrdup (newdir);
+}
+
+
+/* If no build directory has been configured, try to set it from the
+ * environment.  We only do this in development builds to avoid
+ * increasing the set of influential environment variables and hence
+ * the attack surface of production builds.  */
+static void
+gnupg_set_builddir_from_env (void)
+{
+#if defined(IS_DEVELOPMENT_VERSION) || defined(ENABLE_GNUPG_BUILDDIR_ENVVAR)
+  if (gnupg_build_directory)
+    return;
+
+  gnupg_build_directory = getenv ("GNUPG_BUILDDIR");
+#endif
+}
+
+
+/* Return the file name of a helper tool.  WHICH is one of the
+   GNUPG_MODULE_NAME_foo constants.  */
+const char *
+gnupg_module_name (int which)
+{
+  gnupg_set_builddir_from_env ();
+  gnupg_module_name_called = 1;
+
+#define X(a,b,c) do {                                                   \
+    static char *name;                                                  \
+    if (!name)                                                          \
+      name = gnupg_build_directory                                      \
+        ? xstrconcat (gnupg_build_directory,                            \
+                      DIRSEP_S b DIRSEP_S c EXEEXT_S, NULL)             \
+        : xstrconcat (gnupg_ ## a (), DIRSEP_S c EXEEXT_S, NULL);       \
+    return name;                                                        \
+  } while (0)
+
+  switch (which)
+    {
+    case GNUPG_MODULE_NAME_AGENT:
+#ifdef GNUPG_DEFAULT_AGENT
+      return GNUPG_DEFAULT_AGENT;
+#else
+      X(bindir, "agent", "gpg-agent");
+#endif
+
+    case GNUPG_MODULE_NAME_PINENTRY:
+#ifdef GNUPG_DEFAULT_PINENTRY
+      return GNUPG_DEFAULT_PINENTRY;  /* (Set by a configure option) */
+#else
+      return get_default_pinentry_name (0);
+#endif
+
+    case GNUPG_MODULE_NAME_SCDAEMON:
+#ifdef GNUPG_DEFAULT_SCDAEMON
+      return GNUPG_DEFAULT_SCDAEMON;
+#else
+      X(libexecdir, "scd", "scdaemon");
+#endif
+
+    case GNUPG_MODULE_NAME_DIRMNGR:
+#ifdef GNUPG_DEFAULT_DIRMNGR
+      return GNUPG_DEFAULT_DIRMNGR;
+#else
+      X(bindir, "dirmngr", DIRMNGR_NAME);
+#endif
+
+    case GNUPG_MODULE_NAME_PROTECT_TOOL:
+#ifdef GNUPG_DEFAULT_PROTECT_TOOL
+      return GNUPG_DEFAULT_PROTECT_TOOL;
+#else
+      X(libexecdir, "agent", "gpg-protect-tool");
+#endif
+
+    case GNUPG_MODULE_NAME_DIRMNGR_LDAP:
+#ifdef GNUPG_DEFAULT_DIRMNGR_LDAP
+      return GNUPG_DEFAULT_DIRMNGR_LDAP;
+#else
+      X(libexecdir, "dirmngr", "dirmngr_ldap");
+#endif
+
+    case GNUPG_MODULE_NAME_CHECK_PATTERN:
+      X(libexecdir, "tools", "gpg-check-pattern");
+
+    case GNUPG_MODULE_NAME_GPGSM:
+      X(bindir, "sm", "gpgsm");
+
+    case GNUPG_MODULE_NAME_GPG:
+#if USE_GPG2_HACK
+      if (! gnupg_build_directory)
+        X(bindir, "g10", GPG_NAME "2");
+      else
+#endif
+        X(bindir, "g10", GPG_NAME);
+
+    case GNUPG_MODULE_NAME_GPGV:
+#if USE_GPG2_HACK
+      if (! gnupg_build_directory)
+        X(bindir, "g10", GPG_NAME "v2");
+      else
+#endif
+        X(bindir, "g10", GPG_NAME "v");
+
+    case GNUPG_MODULE_NAME_CONNECT_AGENT:
+      X(bindir, "tools", "gpg-connect-agent");
+
+    case GNUPG_MODULE_NAME_GPGCONF:
+      X(bindir, "tools", "gpgconf");
+
+    default:
+      BUG ();
+    }
+#undef X
+}
+
+
+/* Flush some of the cached module names.  This is for example used by
+   gpg-agent to allow configuring a different pinentry.  */
+void
+gnupg_module_name_flush_some (void)
+{
+  (void)get_default_pinentry_name (1);
+}