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gpgtar-list.c
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/* gpgtar-list.c - List 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 <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "../common/i18n.h"
#include "gpgtar.h"
#include "../common/exectool.h"
#include "../common/ccparray.h"
static unsigned long long
parse_xoctal (const void *data, size_t length, const char *filename)
{
const unsigned char *p = data;
unsigned long long value;
if (!length)
value = 0;
else if ( (*p & 0x80))
{
/* Binary format. */
value = (*p++ & 0x7f);
while (--length)
{
value <<= 8;
value |= *p++;
}
}
else
{
/* Octal format */
value = 0;
/* Skip leading spaces and zeroes. */
for (; length && (*p == ' ' || *p == '0'); length--, p++)
;
for (; length && *p; length--, p++)
{
if (*p >= '0' && *p <= '7')
{
value <<= 3;
value += (*p - '0');
}
else
{
log_error ("%s: invalid octal number encountered - assuming 0\n",
filename);
value = 0;
break;
}
}
}
return value;
}
static tar_header_t
parse_header (const void *record, const char *filename)
{
const struct ustar_raw_header *raw = record;
size_t n, namelen, prefixlen;
tar_header_t header;
int use_prefix;
use_prefix = (!memcmp (raw->magic, "ustar", 5)
&& (raw->magic[5] == ' ' || !raw->magic[5]));
for (namelen=0; namelen < sizeof raw->name && raw->name[namelen]; namelen++)
;
if (namelen == sizeof raw->name)
log_info ("%s: warning: name not terminated by a nul byte\n", filename);
for (n=namelen+1; n < sizeof raw->name; n++)
if (raw->name[n])
{
log_info ("%s: warning: garbage after name\n", filename);
break;
}
if (use_prefix && raw->prefix[0])
{
for (prefixlen=0; (prefixlen < sizeof raw->prefix
&& raw->prefix[prefixlen]); prefixlen++)
;
if (prefixlen == sizeof raw->prefix)
log_info ("%s: warning: prefix not terminated by a nul byte\n",
filename);
for (n=prefixlen+1; n < sizeof raw->prefix; n++)
if (raw->prefix[n])
{
log_info ("%s: warning: garbage after prefix\n", filename);
break;
}
}
else
prefixlen = 0;
header = xtrycalloc (1, sizeof *header + prefixlen + 1 + namelen);
if (!header)
{
log_error ("%s: error allocating header: %s\n",
filename, gpg_strerror (gpg_error_from_syserror ()));
return NULL;
}
if (prefixlen)
{
n = prefixlen;
memcpy (header->name, raw->prefix, n);
if (raw->prefix[n-1] != '/')
header->name[n++] = '/';
}
else
n = 0;
memcpy (header->name+n, raw->name, namelen);
header->name[n+namelen] = 0;
header->mode = parse_xoctal (raw->mode, sizeof raw->mode, filename);
header->uid = parse_xoctal (raw->uid, sizeof raw->uid, filename);
header->gid = parse_xoctal (raw->gid, sizeof raw->gid, filename);
header->size = parse_xoctal (raw->size, sizeof raw->size, filename);
header->mtime = parse_xoctal (raw->mtime, sizeof raw->mtime, filename);
/* checksum = */
switch (raw->typeflag[0])
{
case '0': header->typeflag = TF_REGULAR; break;
case '1': header->typeflag = TF_HARDLINK; break;
case '2': header->typeflag = TF_SYMLINK; break;
case '3': header->typeflag = TF_CHARDEV; break;
case '4': header->typeflag = TF_BLOCKDEV; break;
case '5': header->typeflag = TF_DIRECTORY; break;
case '6': header->typeflag = TF_FIFO; break;
case '7': header->typeflag = TF_RESERVED; break;
default: header->typeflag = TF_UNKNOWN; break;
}
/* Compute the number of data records following this header. */
if (header->typeflag == TF_REGULAR || header->typeflag == TF_UNKNOWN)
header->nrecords = (header->size + RECORDSIZE-1)/RECORDSIZE;
else
header->nrecords = 0;
return header;
}
/* Read the next block, assming it is a tar header. Returns a header
object on success in R_HEADER, or an error. If the stream is
consumed, R_HEADER is set to NULL. In case of an error an error
message has been printed. */
static gpg_error_t
read_header (estream_t stream, tar_header_t *r_header)
{
gpg_error_t err;
char record[RECORDSIZE];
int i;
err = read_record (stream, record);
if (err)
return err;
for (i=0; i < RECORDSIZE && !record[i]; i++)
;
if (i == RECORDSIZE)
{
/* All zero header - check whether it is the first part of an
end of archive mark. */
err = read_record (stream, record);
if (err)
return err;
for (i=0; i < RECORDSIZE && !record[i]; i++)
;
if (i != RECORDSIZE)
log_info ("%s: warning: skipping empty header\n",
es_fname_get (stream));
else
{
/* End of archive - FIXME: we might want to check for garbage. */
*r_header = NULL;
return 0;
}
}
*r_header = parse_header (record, es_fname_get (stream));
return *r_header ? 0 : gpg_error_from_syserror ();
}
/* Skip the data records according to HEADER. Prints an error message
on error and return -1. */
static int
skip_data (estream_t stream, tar_header_t header)
{
char record[RECORDSIZE];
unsigned long long n;
for (n=0; n < header->nrecords; n++)
{
if (read_record (stream, record))
return -1;
}
return 0;
}
static void
print_header (tar_header_t header, estream_t out)
{
unsigned long mask;
char modestr[10+1];
int i;
*modestr = '?';
switch (header->typeflag)
{
case TF_REGULAR: *modestr = '-'; break;
case TF_HARDLINK: *modestr = 'h'; break;
case TF_SYMLINK: *modestr = 'l'; break;
case TF_CHARDEV: *modestr = 'c'; break;
case TF_BLOCKDEV: *modestr = 'b'; break;
case TF_DIRECTORY:*modestr = 'd'; break;
case TF_FIFO: *modestr = 'f'; break;
case TF_RESERVED: *modestr = '='; break;
case TF_UNKNOWN: break;
case TF_NOTSUP: break;
}
for (mask = 0400, i = 0; i < 9; i++, mask >>= 1)
modestr[1+i] = (header->mode & mask)? "rwxrwxrwx"[i]:'-';
if ((header->typeflag & 04000))
modestr[3] = modestr[3] == 'x'? 's':'S';
if ((header->typeflag & 02000))
modestr[6] = modestr[6] == 'x'? 's':'S';
if ((header->typeflag & 01000))
modestr[9] = modestr[9] == 'x'? 't':'T';
modestr[10] = 0;
es_fprintf (out, "%s %lu %lu/%lu %12llu %s %s\n",
modestr, header->nlink, header->uid, header->gid, header->size,
isotimestamp (header->mtime), header->name);
}
/* List the tarball FILENAME or, if FILENAME is NULL, the tarball read
from stdin. */
gpg_error_t
gpgtar_list (const char *filename, int decrypt)
{
gpg_error_t err;
estream_t stream;
estream_t cipher_stream = NULL;
tar_header_t header = 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 err;
}
}
else
stream = es_stdin;
if (stream == es_stdin)
es_set_binary (es_stdin);
if (decrypt)
{
strlist_t arg;
ccparray_t ccp;
const char **argv;
cipher_stream = stream;
stream = es_fopenmem (0, "rwb");
if (! stream)
{
err = gpg_error_from_syserror ();
goto leave;
}
ccparray_init (&ccp, 0);
ccparray_put (&ccp, "--decrypt");
for (arg = opt.gpg_arguments; arg; arg = arg->next)
ccparray_put (&ccp, arg->d);
ccparray_put (&ccp, NULL);
argv = ccparray_get (&ccp, NULL);
if (!argv)
{
err = gpg_error_from_syserror ();
goto leave;
}
err = gnupg_exec_tool_stream (opt.gpg_program, argv,
cipher_stream, NULL, stream, NULL, NULL);
xfree (argv);
if (err)
goto leave;
err = es_fseek (stream, 0, SEEK_SET);
if (err)
goto leave;
}
for (;;)
{
err = read_header (stream, &header);
if (err || header == NULL)
goto leave;
print_header (header, es_stdout);
if (skip_data (stream, header))
goto leave;
xfree (header);
header = NULL;
}
leave:
xfree (header);
if (stream != es_stdin)
es_fclose (stream);
if (stream != cipher_stream)
es_fclose (cipher_stream);
return err;
}
gpg_error_t
gpgtar_read_header (estream_t stream, tar_header_t *r_header)
{
return read_header (stream, r_header);
}
void
gpgtar_print_header (tar_header_t header, estream_t out)
{
if (header && out)
print_header (header, out);
}

File Metadata

Mime Type
text/x-c
Expires
Sat, Nov 22, 1:28 PM (1 d, 13 h)
Storage Engine
local-disk
Storage Format
Raw Data
Storage Handle
bf/25/f9dd1df2b587d80c07fb4273725d

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