common: Add gnupg_check_special_filename.

* common/sysutils.h (gnupg_check_special_filename): New.
* common/sysutils.c (gnupg_check_special_filename): New.
* common/iobuf.c (translate_file_handle): Remove.
(iobuf_is_pipe_filename): Use gnupg_check_special_filename.
(do_open): Use gnupg_check_special_filename.
* g10/plaintext.c (get_output_file): Use gnupg_check_special_filename
and open_stream_nc.

--

GnuPG-bug-id: 6580
Signed-off-by: NIIBE Yutaka <[email protected]>

1 files changed, 42 insertions, 0 deletions

diff --git a/common/sysutils.c b/common/sysutils.c
index 745b762ba..80aa3a04a 100644
--- a/common/sysutils.c
+++ b/common/sysutils.c
@@ -682,6 +682,48 @@ check_special_filename (const char *fname, int for_write, int notranslate)
 }
 
 
+/* Check whether FNAME has the form "-&nnnn", where N is a number
+ * representing a file.  Returns GNUPG_INVALID_FD if it is not the
+ * case.  Returns a file descriptor on POSIX, a system handle on
+ * Windows.  */
+gnupg_fd_t
+gnupg_check_special_filename (const char *fname)
+{
+  if (allow_special_filenames
+      && fname && *fname == '-' && fname[1] == '&')
+    {
+      int i;
+
+      fname += 2;
+      for (i=0; digitp (fname+i); i++ )
+        ;
+      if (!fname[i])
+        {
+          es_syshd_t syshd;
+
+          if (gnupg_parse_fdstr (fname,  &syshd))
+            return GNUPG_INVALID_FD;
+
+#ifdef HAVE_W32_SYSTEM
+          if (syshd.type == ES_SYSHD_FD)
+            {
+              if (syshd.u.fd == 0)
+                return GetStdHandle (STD_INPUT_HANDLE);
+              else if (syshd.u.fd == 1)
+                return GetStdHandle (STD_OUTPUT_HANDLE);
+              else if (syshd.u.fd == 2)
+                return GetStdHandle (STD_ERROR_HANDLE);
+            }
+          else
+            return syshd.u.handle;
+#else
+          return syshd.u.fd;
+#endif
+        }
+    }
+  return GNUPG_INVALID_FD;
+}
+
 /* Replacement for tmpfile().  This is required because the tmpfile
    function of Windows' runtime library is broken, insecure, ignores
    TMPDIR and so on.  In addition we create a file with an inheritable