mirror of
git://git.gnupg.org/gnupg.git
synced 2024-12-24 10:39:57 +01:00
333 lines
8.4 KiB
C
333 lines
8.4 KiB
C
/* 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 <http://www.gnu.org/licenses/>.
|
||
*/
|
||
|
||
#include <config.h>
|
||
#include <errno.h>
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
#include <assert.h>
|
||
#include <fcntl.h>
|
||
|
||
#include "i18n.h"
|
||
#include "gpgtar.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 or NULL one error. In case of an error an error
|
||
message has been printed. */
|
||
static tar_header_t
|
||
read_header (estream_t stream)
|
||
{
|
||
gpg_error_t err;
|
||
char record[RECORDSIZE];
|
||
int i;
|
||
|
||
err = read_record (stream, record);
|
||
if (err)
|
||
return NULL;
|
||
|
||
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 NULL;
|
||
|
||
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. */
|
||
return NULL;
|
||
}
|
||
}
|
||
|
||
return parse_header (record, es_fname_get (stream));
|
||
}
|
||
|
||
|
||
/* 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. */
|
||
void
|
||
gpgtar_list (const char *filename)
|
||
{
|
||
gpg_error_t err;
|
||
estream_t stream;
|
||
tar_header_t header;
|
||
|
||
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
|
||
|
||
for (;;)
|
||
{
|
||
header = read_header (stream);
|
||
if (!header)
|
||
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);
|
||
return;
|
||
}
|
||
|
||
tar_header_t
|
||
gpgtar_read_header (estream_t stream)
|
||
{
|
||
/*FIXME: Change to return an error code. */
|
||
return read_header (stream);
|
||
}
|
||
|
||
void
|
||
gpgtar_print_header (tar_header_t header, estream_t out)
|
||
{
|
||
if (header && out)
|
||
print_header (header, out);
|
||
}
|