mirror of
git://git.gnupg.org/gnupg.git
synced 2024-11-09 21:28:51 +01:00
350 lines
8.6 KiB
C
350 lines
8.6 KiB
C
/* gpgtar-extract.c - Extract from a TAR archive
|
||
* Copyright (C) 2010 Free Software Foundation, Inc.
|
||
*
|
||
* This file is part of GnuPG.
|
||
*
|
||
* GnuPG 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 3 of the License, or
|
||
* (at your option) any later version.
|
||
*
|
||
* GnuPG 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/>.
|
||
*/
|
||
|
||
#include <config.h>
|
||
#include <errno.h>
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
#include <sys/types.h>
|
||
#include <sys/stat.h>
|
||
#include <unistd.h>
|
||
#include <assert.h>
|
||
#ifdef HAVE_W32_SYSTEM
|
||
# include <fcntl.h> /* for setmode() */
|
||
#endif /*HAVE_W32_SYSTEM*/
|
||
|
||
#include "i18n.h"
|
||
#include "../common/sysutils.h"
|
||
#include "gpgtar.h"
|
||
|
||
#ifndef GPG_ERR_LIMIT_REACHED
|
||
#define GPG_ERR_LIMIT_REACHED 183
|
||
#endif
|
||
|
||
|
||
static gpg_error_t
|
||
extract_regular (estream_t stream, const char *dirname,
|
||
tar_header_t hdr)
|
||
{
|
||
gpg_error_t err;
|
||
char record[RECORDSIZE];
|
||
size_t n, nbytes, nwritten;
|
||
char *fname;
|
||
estream_t outfp = NULL;
|
||
|
||
fname = strconcat (dirname, "/", hdr->name, NULL);
|
||
if (!fname)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error ("error creating filename: %s\n", gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
else
|
||
err = 0;
|
||
|
||
outfp = es_fopen (fname, "wb");
|
||
if (!outfp)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error ("error creating `%s': %s\n", fname, gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
for (n=0; n < hdr->nrecords;)
|
||
{
|
||
err = read_record (stream, record);
|
||
if (err)
|
||
goto leave;
|
||
n++;
|
||
nbytes = (n < hdr->nrecords)? RECORDSIZE : (hdr->size % RECORDSIZE);
|
||
nwritten = es_fwrite (record, 1, nbytes, outfp);
|
||
if (nwritten != nbytes)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error ("error writing `%s': %s\n", fname, gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
}
|
||
/* Fixme: Set permissions etc. */
|
||
|
||
leave:
|
||
if (!err && opt.verbose)
|
||
log_info ("extracted `%s'\n", fname);
|
||
es_fclose (outfp);
|
||
if (err && fname && outfp)
|
||
{
|
||
if (remove (fname))
|
||
log_error ("error removing incomplete file `%s': %s\n",
|
||
fname, gpg_strerror (gpg_error_from_syserror ()));
|
||
}
|
||
xfree (fname);
|
||
return err;
|
||
}
|
||
|
||
|
||
static gpg_error_t
|
||
extract_directory (const char *dirname, tar_header_t hdr)
|
||
{
|
||
gpg_error_t err;
|
||
char *fname;
|
||
size_t prefixlen;
|
||
|
||
prefixlen = strlen (dirname) + 1;
|
||
fname = strconcat (dirname, "/", hdr->name, NULL);
|
||
if (!fname)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error ("error creating filename: %s\n", gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
else
|
||
err = 0;
|
||
|
||
if (fname[strlen (fname)-1] == '/')
|
||
fname[strlen (fname)-1] = 0;
|
||
|
||
/* Note that we don't need to care about EEXIST because we always
|
||
extract into a new hierarchy. */
|
||
if (gnupg_mkdir (fname, "-rwx------"))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
if (gpg_err_code (err) == GPG_ERR_ENOENT)
|
||
{
|
||
/* Try to create the directory with parents but keep the
|
||
original error code in case of a failure. */
|
||
char *p;
|
||
int rc = 0;
|
||
|
||
for (p = fname+prefixlen; (p = strchr (p, '/')); p++)
|
||
{
|
||
*p = 0;
|
||
rc = gnupg_mkdir (fname, "-rwx------");
|
||
*p = '/';
|
||
if (rc)
|
||
break;
|
||
}
|
||
if (!rc && !gnupg_mkdir (fname, "-rwx------"))
|
||
err = 0;
|
||
}
|
||
if (err)
|
||
log_error ("error creating directory `%s': %s\n",
|
||
fname, gpg_strerror (err));
|
||
}
|
||
|
||
leave:
|
||
if (!err && opt.verbose)
|
||
log_info ("created `%s/'\n", fname);
|
||
xfree (fname);
|
||
return err;
|
||
}
|
||
|
||
|
||
static gpg_error_t
|
||
extract (estream_t stream, const char *dirname, tar_header_t hdr)
|
||
{
|
||
gpg_error_t err;
|
||
size_t n;
|
||
|
||
n = strlen (hdr->name);
|
||
#ifdef HAVE_DOSISH_SYSTEM
|
||
if (strchr (hdr->name, '\\'))
|
||
{
|
||
log_error ("filename `%s' contains a backslash - "
|
||
"can't extract on this system\n", hdr->name);
|
||
return gpg_error (GPG_ERR_INV_NAME);
|
||
}
|
||
#endif /*HAVE_DOSISH_SYSTEM*/
|
||
|
||
if (!n
|
||
|| strstr (hdr->name, "//")
|
||
|| strstr (hdr->name, "/../")
|
||
|| !strncmp (hdr->name, "../", 3)
|
||
|| (n >= 3 && !strcmp (hdr->name+n-3, "/.." )))
|
||
{
|
||
log_error ("filename `%s' as suspicious parts - not extracting\n",
|
||
hdr->name);
|
||
return gpg_error (GPG_ERR_INV_NAME);
|
||
}
|
||
|
||
if (hdr->typeflag == TF_REGULAR || hdr->typeflag == TF_UNKNOWN)
|
||
err = extract_regular (stream, dirname, hdr);
|
||
else if (hdr->typeflag == TF_DIRECTORY)
|
||
err = extract_directory (dirname, hdr);
|
||
else
|
||
{
|
||
char record[RECORDSIZE];
|
||
|
||
log_info ("unsupported file type %d for `%s' - skipped\n",
|
||
(int)hdr->typeflag, hdr->name);
|
||
for (err = 0, n=0; !err && n < hdr->nrecords; n++)
|
||
err = read_record (stream, record);
|
||
}
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Create a new directory to be used for extracting the tarball.
|
||
Returns the name of the directory which must be freed by the
|
||
caller. In case of an error a diagnostic is printed and NULL
|
||
returned. */
|
||
static char *
|
||
create_directory (const char *dirprefix)
|
||
{
|
||
gpg_error_t err = 0;
|
||
char *prefix_buffer = NULL;
|
||
char *dirname = NULL;
|
||
size_t n;
|
||
int idx;
|
||
|
||
/* Remove common suffixes. */
|
||
n = strlen (dirprefix);
|
||
if (n > 4 && (!compare_filenames (dirprefix + n - 4, EXTSEP_S "gpg")
|
||
|| !compare_filenames (dirprefix + n - 4, EXTSEP_S "pgp")
|
||
|| !compare_filenames (dirprefix + n - 4, EXTSEP_S "asc")
|
||
|| !compare_filenames (dirprefix + n - 4, EXTSEP_S "pem")
|
||
|| !compare_filenames (dirprefix + n - 4, EXTSEP_S "p7m")
|
||
|| !compare_filenames (dirprefix + n - 4, EXTSEP_S "p7e")))
|
||
{
|
||
prefix_buffer = xtrystrdup (dirprefix);
|
||
if (!prefix_buffer)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
prefix_buffer[n-4] = 0;
|
||
dirprefix = prefix_buffer;
|
||
}
|
||
|
||
|
||
|
||
for (idx=1; idx < 5000; idx++)
|
||
{
|
||
xfree (dirname);
|
||
dirname = xtryasprintf ("%s_%d_", dirprefix, idx);
|
||
if (!dirname)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
if (!gnupg_mkdir (dirname, "-rwx------"))
|
||
goto leave; /* Ready. */
|
||
if (errno != EEXIST && errno != ENOTDIR)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
}
|
||
err = gpg_error (GPG_ERR_LIMIT_REACHED);
|
||
|
||
leave:
|
||
if (err)
|
||
{
|
||
log_error ("error creating an extract directory: %s\n",
|
||
gpg_strerror (err));
|
||
xfree (dirname);
|
||
dirname = NULL;
|
||
}
|
||
xfree (prefix_buffer);
|
||
return dirname;
|
||
}
|
||
|
||
|
||
|
||
void
|
||
gpgtar_extract (const char *filename)
|
||
{
|
||
gpg_error_t err;
|
||
estream_t stream;
|
||
tar_header_t header = NULL;
|
||
const char *dirprefix = NULL;
|
||
char *dirname = NULL;
|
||
|
||
if (filename)
|
||
{
|
||
if (!strcmp (filename, "-"))
|
||
stream = es_stdin;
|
||
else
|
||
stream = es_fopen (filename, "rb");
|
||
if (!stream)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error ("error opening `%s': %s\n", filename, gpg_strerror (err));
|
||
return;
|
||
}
|
||
}
|
||
else
|
||
stream = es_stdin;
|
||
|
||
#ifdef HAVE_DOSISH_SYSTEM
|
||
if (stream == es_stdin)
|
||
setmode (es_fileno (es_stdin), O_BINARY);
|
||
#endif
|
||
|
||
if (filename && stream != es_stdin)
|
||
{
|
||
dirprefix = strrchr (filename, '/');
|
||
if (dirprefix)
|
||
dirprefix++;
|
||
else
|
||
dirprefix = filename;
|
||
}
|
||
else if (opt.filename)
|
||
{
|
||
dirprefix = strrchr (opt.filename, '/');
|
||
if (dirprefix)
|
||
dirprefix++;
|
||
else
|
||
dirprefix = opt.filename;
|
||
}
|
||
|
||
if (!dirprefix || !*dirprefix)
|
||
dirprefix = "GPGARCH";
|
||
|
||
dirname = create_directory (dirprefix);
|
||
if (!dirname)
|
||
{
|
||
err = gpg_error (GPG_ERR_GENERAL);
|
||
goto leave;
|
||
}
|
||
|
||
if (opt.verbose)
|
||
log_info ("extracting to `%s/'\n", dirname);
|
||
|
||
for (;;)
|
||
{
|
||
header = gpgtar_read_header (stream);
|
||
if (!header)
|
||
goto leave;
|
||
|
||
if (extract (stream, dirname, header))
|
||
goto leave;
|
||
xfree (header);
|
||
header = NULL;
|
||
}
|
||
|
||
|
||
leave:
|
||
xfree (header);
|
||
xfree (dirname);
|
||
if (stream != es_stdin)
|
||
es_fclose (stream);
|
||
return;
|
||
}
|