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common: Add gnupg_check_special_filename.

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* 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 <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2023-07-11 10:46:36 +09:00
parent 37343db08f
commit 250733c0d8
No known key found for this signature in database
GPG key ID: 640114AF89DE6054
4 changed files with 52 additions and 41 deletions
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42
common/sysutils.c
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@ -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