common: New functions gnupg_opendir et al.

* common/sysutils.h (struct gnupg_dirent_s): New.
* common/sysutils.c: Include dirent.h.
(struct gnupg_dir_s): New.
(gnupg_opendir, gnupg_readdir, gnupg_closedir): New.  Change all
callers of opendir, readdir, and closedir to use these functions.
--

GnuPG-bug-id: 5098
Backported-from-master: 7e22e08e2ab09cd3c2317f5e80e8ee47d46eff4b

8 files changed, 210 insertions, 37 deletions

diff --git a/agent/command.c b/agent/command.c
index 9e3483e8c..2cac9cc43 100644
--- a/agent/command.c
+++ b/agent/command.c
@@ -1260,7 +1260,7 @@ cmd_keyinfo (assuan_context_t ctx, char *line)
   ctrl_t ctrl = assuan_get_pointer (ctx);
   int err;
   unsigned char grip[20];
-  DIR *dir = NULL;
+  gnupg_dir_t dir = NULL;
   int list_mode;
   int opt_data, opt_ssh_fpr, opt_with_ssh;
   ssh_control_file_t cf = NULL;
@@ -1316,7 +1316,7 @@ cmd_keyinfo (assuan_context_t ctx, char *line)
   else if (list_mode)
     {
       char *dirname;
-      struct dirent *dir_entry;
+      gnupg_dirent_t dir_entry;
 
       dirname = make_filename_try (gnupg_homedir (),
                                    GNUPG_PRIVATE_KEYS_DIR, NULL);
@@ -1325,7 +1325,7 @@ cmd_keyinfo (assuan_context_t ctx, char *line)
           err = gpg_error_from_syserror ();
           goto leave;
         }
-      dir = opendir (dirname);
+      dir = gnupg_opendir (dirname);
       if (!dir)
         {
           err = gpg_error_from_syserror ();
@@ -1334,7 +1334,7 @@ cmd_keyinfo (assuan_context_t ctx, char *line)
         }
       xfree (dirname);
 
-      while ( (dir_entry = readdir (dir)) )
+      while ( (dir_entry = gnupg_readdir (dir)) )
         {
           if (strlen (dir_entry->d_name) != 44
               || strcmp (dir_entry->d_name + 40, ".key"))
@@ -1385,8 +1385,7 @@ cmd_keyinfo (assuan_context_t ctx, char *line)
 
  leave:
   ssh_close_control_file (cf);
-  if (dir)
-    closedir (dir);
+  gnupg_closedir (dir);
   if (err && gpg_err_code (err) != GPG_ERR_NOT_FOUND)
     leave_cmd (ctx, err);
   return err;
diff --git a/common/sysutils.c b/common/sysutils.c
index 422a783e5..acfea7db6 100644
--- a/common/sysutils.c
+++ b/common/sysutils.c
@@ -73,6 +73,7 @@
 # include <npth.h>
 #endif
 #include <fcntl.h>
+#include <dirent.h>
 
 #include <assuan.h>
 
@@ -83,6 +84,22 @@
 
 #define tohex(n) ((n) < 10 ? ((n) + '0') : (((n) - 10) + 'A'))
 
+
+/* The object used with our opendir functions.  We need to define our
+ * own so that we can properly handle Unicode on Windows.  */
+struct gnupg_dir_s
+{
+#ifdef HAVE_W32_SYSTEM
+  _WDIR *dir;                    /* The system's DIR pointer.  */
+#else
+  DIR *dir;                      /* The system's DIR pointer.  */
+#endif
+  struct gnupg_dirent_s dirent;  /* The current dirent.  */
+  size_t namesize;  /* If not 0 the allocated size of dirent.d_name.  */
+  char name[256];   /* Only used if NAMESIZE is 0.  */
+};
+
+
 /* Flag to tell whether special file names are enabled.  See gpg.c for
  * an explanation of these file names.  */
 static int allow_special_filenames;
@@ -1205,6 +1222,151 @@ gnupg_open (const char *name, int flags, unsigned int mode)
 }
 
 
+/* A wrapper around opendir to handle Unicode file names under
+ * Windows.  This assumes the mingw toolchain.  */
+gnupg_dir_t
+gnupg_opendir (const char *name)
+{
+#ifdef HAVE_W32_SYSTEM
+  _WDIR *dir;
+  wchar_t *wname;
+#else
+  DIR *dir;
+#endif
+  gnupg_dir_t gdir;
+
+#ifdef HAVE_W32_SYSTEM
+  /* Note: See gpgtar-create for an alternative implementation which
+   * could be used here to avoid a mingw dependency.  */
+  wname = utf8_to_wchar (name);
+  if (!wname)
+    return NULL;
+  dir = _wopendir (wname);
+  xfree (wname);
+#else
+  dir = opendir (name);
+#endif
+
+  if (!dir)
+    return NULL;
+
+  gdir = xtrymalloc (sizeof *gdir);
+  if (!gdir)
+    {
+      int save_errno = errno;
+#ifdef HAVE_W32_SYSTEM
+      _wclosedir (dir);
+#else
+      closedir (dir);
+#endif
+      gpg_err_set_errno (save_errno);
+      return NULL;
+    }
+  gdir->dir = dir;
+  gdir->namesize = 0;
+  gdir->dirent.d_name = gdir->name;
+
+  return gdir;
+}
+
+
+gnupg_dirent_t
+gnupg_readdir (gnupg_dir_t gdir)
+{
+#ifdef HAVE_W32_SYSTEM
+  char *namebuffer = NULL;
+  struct _wdirent *de;
+#else
+  struct dirent *de;
+#endif
+  size_t n;
+  gnupg_dirent_t gde;
+  const char *name;
+
+  if (!gdir)
+    {
+      gpg_err_set_errno (EINVAL);
+      return 0;
+    }
+
+#ifdef HAVE_W32_SYSTEM
+  de = _wreaddir (gdir->dir);
+  if (!de)
+    return NULL;
+  namebuffer = wchar_to_utf8 (de->d_name);
+  if (!namebuffer)
+    return NULL;
+  name = namebuffer;
+#else
+  de = readdir (gdir->dir);
+  if (!de)
+    return NULL;
+  name = de->d_name;
+#endif
+
+  gde = &gdir->dirent;
+  n = strlen (name);
+  if (gdir->namesize)
+    {
+      /* Use allocated buffer.  */
+      if (n+1 >= gdir->namesize || !gde->d_name)
+        {
+          gdir->namesize = n + 256;
+          xfree (gde->d_name);
+          gde->d_name = xtrymalloc (gdir->namesize);
+          if (!gde->d_name)
+            return NULL;  /* ERRNO is already set.  */
+        }
+      strcpy (gde->d_name, name);
+    }
+  else if (n+1 >= sizeof (gdir->name))
+    {
+      /* Switch to allocated buffer.  */
+      gdir->namesize = n + 256;
+      gde->d_name = xtrymalloc (gdir->namesize);
+      if (!gde->d_name)
+        return NULL;  /* ERRNO is already set.  */
+      strcpy (gde->d_name, name);
+    }
+  else
+    {
+      /* Use static buffer.  */
+      gde->d_name = gdir->name;
+      strcpy (gde->d_name, name);
+    }
+
+#ifdef HAVE_W32_SYSTEM
+  xfree (namebuffer);
+#endif
+
+  return gde;
+}
+
+
+int
+gnupg_closedir (gnupg_dir_t gdir)
+{
+#ifdef HAVE_W32_SYSTEM
+  _WDIR *dir;
+#else
+  DIR *dir;
+#endif
+
+  if (!gdir)
+    return 0;
+  dir = gdir->dir;
+  if (gdir->namesize)
+    xfree (gdir->dirent.d_name);
+  xfree (gdir);
+
+#ifdef HAVE_W32_SYSTEM
+  return _wclosedir (dir);
+#else
+  return closedir (dir);
+#endif
+}
+
+
 
 #ifdef HAVE_W32CE_SYSTEM
 /* There is a isatty function declaration in cegcc but it does not
diff --git a/common/sysutils.h b/common/sysutils.h
index 1862926ef..63c259b0d 100644
--- a/common/sysutils.h
+++ b/common/sysutils.h
@@ -50,6 +50,19 @@ typedef int gnupg_fd_t;
 # include <sys/stat.h>
 #endif
 
+struct gnupg_dir_s;
+typedef struct gnupg_dir_s *gnupg_dir_t;
+struct gnupg_dirent_s
+{
+  /* We don't have a d_ino because that can't be used on Windows
+   * anyway.  D_NAME is a pointer into the gnupg_dir_s which has a
+   * static buffer or allocates sufficient space as needed.  This is
+   * only valid after gnupg_readdir. */
+  char *d_name;
+};
+typedef struct gnupg_dirent_s *gnupg_dirent_t;
+
+
 void trap_unaligned (void);
 int  disable_core_dumps (void);
 int  enable_core_dumps (void);
@@ -80,6 +93,9 @@ gpg_err_code_t gnupg_access (const char *name, int mode);
 int gnupg_stat (const char *name, struct stat *statbuf);
 #endif /*HAVE_STAT*/
 int gnupg_open (const char *name, int flags, unsigned int mode);
+gnupg_dir_t gnupg_opendir (const char *name);
+gnupg_dirent_t gnupg_readdir (gnupg_dir_t gdir);
+int gnupg_closedir (gnupg_dir_t gdir);
 char *gnupg_get_socket_name (int fd);
 int gnupg_fd_valid (int fd);
 
diff --git a/dirmngr/certcache.c b/dirmngr/certcache.c
index 04da510a0..9ca6069a2 100644
--- a/dirmngr/certcache.c
+++ b/dirmngr/certcache.c
@@ -364,8 +364,8 @@ static gpg_error_t
 load_certs_from_dir (const char *dirname, unsigned int trustclass)
 {
   gpg_error_t err;
-  DIR *dir;
-  struct dirent *ep;
+  gnupg_dir_t dir;
+  gnupg_dirent_t ep;
   char *p;
   size_t n;
   estream_t fp;
@@ -373,13 +373,13 @@ load_certs_from_dir (const char *dirname, unsigned int trustclass)
   ksba_cert_t cert;
   char *fname = NULL;
 
-  dir = opendir (dirname);
+  dir = gnupg_opendir (dirname);
   if (!dir)
     {
       return 0; /* We do not consider this a severe error.  */
     }
 
-  while ( (ep=readdir (dir)) )
+  while ( (ep = gnupg_readdir (dir)) )
     {
       p = ep->d_name;
       if (*p == '.' || !*p)
@@ -447,7 +447,7 @@ load_certs_from_dir (const char *dirname, unsigned int trustclass)
     }
 
   xfree (fname);
-  closedir (dir);
+  gnupg_closedir (dir);
   return 0;
 }
 
diff --git a/dirmngr/crlcache.c b/dirmngr/crlcache.c
index 6468ce38f..eee4b7229 100644
--- a/dirmngr/crlcache.c
+++ b/dirmngr/crlcache.c
@@ -101,10 +101,6 @@
 #ifndef HAVE_W32_SYSTEM
 #include <sys/utsname.h>
 #endif
-#ifdef MKDIR_TAKES_ONE_ARG
-#undef mkdir
-#define mkdir(a,b) mkdir(a)
-#endif
 
 #include "dirmngr.h"
 #include "validate.h"
@@ -206,15 +202,15 @@ get_current_cache (void)
 static int
 create_directory_if_needed (const char *name)
 {
-  DIR *dir;
+  gnupg_dir_t dir;
   char *fname;
 
   fname = make_filename (opt.homedir_cache, name, NULL);
-  dir = opendir (fname);
+  dir = gnupg_opendir (fname);
   if (!dir)
     {
       log_info (_("creating directory '%s'\n"), fname);
-      if (mkdir (fname, S_IRUSR|S_IWUSR|S_IXUSR) )
+      if (gnupg_mkdir (fname, "-rwx"))
         {
           int save_errno = errno;
           log_error (_("error creating directory '%s': %s\n"),
@@ -225,7 +221,7 @@ create_directory_if_needed (const char *name)
         }
     }
   else
-    closedir (dir);
+    gnupg_closedir (dir);
   xfree (fname);
   return 0;
 }
@@ -237,8 +233,8 @@ static int
 cleanup_cache_dir (int force)
 {
   char *dname = make_filename (opt.homedir_cache, DBDIR_D, NULL);
-  DIR *dir;
-  struct dirent *de;
+  gnupg_dir_t dir;
+  gnupg_dirent_t de;
   int problem = 0;
 
   if (!force)
@@ -251,7 +247,7 @@ cleanup_cache_dir (int force)
         }
     }
 
-  dir = opendir (dname);
+  dir = gnupg_opendir (dname);
   if (!dir)
     {
       log_error (_("error reading directory '%s': %s\n"),
@@ -260,7 +256,7 @@ cleanup_cache_dir (int force)
       return -1;
     }
 
-  while ((de = readdir (dir)))
+  while ((de = gnupg_readdir (dir)))
     {
       if (strcmp (de->d_name, "." ) && strcmp (de->d_name, ".."))
         {
@@ -289,7 +285,7 @@ cleanup_cache_dir (int force)
         }
     }
   xfree (dname);
-  closedir (dir);
+  gnupg_closedir (dir);
   return problem;
 }
 
diff --git a/dirmngr/dirmngr.c b/dirmngr/dirmngr.c
index 4a29bf8ad..3500e7eea 100644
--- a/dirmngr/dirmngr.c
+++ b/dirmngr/dirmngr.c
@@ -1277,7 +1277,7 @@ main (int argc, char **argv)
         {
           log_error (_("error binding socket to '%s': %s\n"),
                      serv_addr.sun_path,
-                     gpg_strerror (gpg_error_from_errno (errno)));
+                     gpg_strerror (gpg_error_from_syserror ()));
           assuan_sock_close (fd);
           dirmngr_exit (1);
         }
diff --git a/tools/gpg-wks-server.c b/tools/gpg-wks-server.c
index 6e5e9eb82..addafa27d 100644
--- a/tools/gpg-wks-server.c
+++ b/tools/gpg-wks-server.c
@@ -1608,22 +1608,22 @@ static gpg_error_t
 get_domain_list (strlist_t *r_list)
 {
   gpg_error_t err;
-  DIR *dir = NULL;
+  gnupg_dir_t dir = NULL;
   char *fname = NULL;
-  struct dirent *dentry;
+  gnupg_dirent_t dentry;
   struct stat sb;
   strlist_t list = NULL;
 
   *r_list = NULL;
 
-  dir = opendir (opt.directory);
+  dir = gnupg_opendir (opt.directory);
   if (!dir)
     {
       err = gpg_error_from_syserror ();
       goto leave;
     }
 
-  while ((dentry = readdir (dir)))
+  while ((dentry = gnupg_readdir (dir)))
     {
       if (*dentry->d_name == '.')
         continue;
@@ -1663,8 +1663,7 @@ get_domain_list (strlist_t *r_list)
 
  leave:
   free_strlist (list);
-  if (dir)
-    closedir (dir);
+  gnupg_closedir (dir);
   xfree (fname);
   return err;
 }
@@ -1677,8 +1676,8 @@ expire_one_domain (const char *top_dirname, const char *domain)
   gpg_error_t err;
   char *dirname;
   char *fname = NULL;
-  DIR *dir = NULL;
-  struct dirent *dentry;
+  gnupg_dir_t dir = NULL;
+  gnupg_dirent_t dentry;
   struct stat sb;
   time_t now = gnupg_get_time ();
 
@@ -1691,7 +1690,7 @@ expire_one_domain (const char *top_dirname, const char *domain)
       goto leave;
     }
 
-  dir = opendir (dirname);
+  dir = gnupg_opendir (dirname);
   if (!dir)
     {
       err = gpg_error_from_syserror ();
@@ -1700,7 +1699,7 @@ expire_one_domain (const char *top_dirname, const char *domain)
       goto leave;
     }
 
-  while ((dentry = readdir (dir)))
+  while ((dentry = gnupg_readdir (dir)))
     {
       if (*dentry->d_name == '.')
         continue;
@@ -1749,8 +1748,7 @@ expire_one_domain (const char *top_dirname, const char *domain)
   err = 0;
 
  leave:
-  if (dir)
-    closedir (dir);
+  gnupg_closedir (dir);
   xfree (dirname);
   xfree (fname);
   return err;
diff --git a/tools/gpgtar-create.c b/tools/gpgtar-create.c
index 17c24c3d5..c196b96f6 100644
--- a/tools/gpgtar-create.c
+++ b/tools/gpgtar-create.c
@@ -301,6 +301,8 @@ scan_directory (const char *dname, scanctrl_t scanctrl)
   gpg_error_t err = 0;
 
 #ifdef HAVE_W32_SYSTEM
+  /* Note that we introduced gnupg_opendir only after we had deployed
+   * this code and thus we don't change it for now.  */
   WIN32_FIND_DATAW fi;
   HANDLE hd = INVALID_HANDLE_VALUE;
   char *p;