mirror of git://git.gnupg.org/gnupg.git
325 lines
8.2 KiB
C
325 lines
8.2 KiB
C
/* gpgtar-list.c - List a TAR archive
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* Copyright (C) 2010 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "i18n.h"
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#include "gpgtar.h"
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static unsigned long long
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parse_xoctal (const void *data, size_t length, const char *filename)
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{
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const unsigned char *p = data;
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unsigned long long value;
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if (!length)
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value = 0;
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else if ( (*p & 0x80))
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{
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/* Binary format. */
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value = (*p++ & 0x7f);
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while (--length)
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{
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value <<= 8;
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value |= *p++;
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}
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}
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else
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{
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/* Octal format */
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value = 0;
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/* Skip leading spaces and zeroes. */
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for (; length && (*p == ' ' || *p == '0'); length--, p++)
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;
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for (; length && *p; length--, p++)
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{
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if (*p >= '0' && *p <= '7')
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{
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value <<= 3;
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value += (*p - '0');
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}
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else
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{
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log_error ("%s: invalid octal number encountered - assuming 0\n",
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filename);
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value = 0;
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break;
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}
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}
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}
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return value;
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}
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static tar_header_t
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parse_header (const void *record, const char *filename)
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{
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const struct ustar_raw_header *raw = record;
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size_t n, namelen, prefixlen;
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tar_header_t header;
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int use_prefix;
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use_prefix = (!memcmp (raw->magic, "ustar", 5)
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&& (raw->magic[5] == ' ' || !raw->magic[5]));
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for (namelen=0; namelen < sizeof raw->name && raw->name[namelen]; namelen++)
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;
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if (namelen == sizeof raw->name)
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log_info ("%s: warning: name not terminated by a nul byte\n",
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filename);
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for (n=namelen+1; n < sizeof raw->name; n++)
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if (raw->name[n])
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{
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log_info ("%s: warning: garbage after name\n", filename);
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break;
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}
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if (use_prefix && raw->prefix[0])
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{
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for (prefixlen=0; (prefixlen < sizeof raw->prefix
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&& raw->prefix[prefixlen]); prefixlen++)
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;
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if (prefixlen == sizeof raw->prefix)
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log_info ("%s: warning: prefix not terminated by a nul byte\n",
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filename);
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for (n=prefixlen+1; n < sizeof raw->prefix; n++)
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if (raw->prefix[n])
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{
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log_info ("%s: warning: garbage after prefix\n", filename);
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break;
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}
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}
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else
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prefixlen = 0;
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header = xtrycalloc (1, sizeof *header + prefixlen + 1 + namelen);
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if (!header)
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{
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log_error ("%s: error allocating header: %s\n",
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filename, gpg_strerror (gpg_error_from_syserror ()));
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return NULL;
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}
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if (prefixlen)
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{
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n = prefixlen;
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memcpy (header->name, raw->prefix, n);
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if (raw->prefix[n-1] != '/')
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header->name[n++] = '/';
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}
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else
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n = 0;
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memcpy (header->name+n, raw->name, namelen);
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header->name[n+namelen] = 0;
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header->mode = parse_xoctal (raw->mode, sizeof raw->mode, filename);
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header->uid = parse_xoctal (raw->uid, sizeof raw->uid, filename);
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header->gid = parse_xoctal (raw->gid, sizeof raw->gid, filename);
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header->size = parse_xoctal (raw->size, sizeof raw->size, filename);
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header->mtime = parse_xoctal (raw->mtime, sizeof raw->mtime, filename);
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/* checksum = */
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switch (raw->typeflag[0])
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{
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case '0': header->typeflag = TF_REGULAR; break;
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case '1': header->typeflag = TF_HARDLINK; break;
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case '2': header->typeflag = TF_SYMLINK; break;
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case '3': header->typeflag = TF_CHARDEV; break;
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case '4': header->typeflag = TF_BLOCKDEV; break;
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case '5': header->typeflag = TF_DIRECTORY; break;
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case '6': header->typeflag = TF_FIFO; break;
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case '7': header->typeflag = TF_RESERVED; break;
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default: header->typeflag = TF_UNKNOWN; break;
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}
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/* Compute the number of data records following this header. */
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if (header->typeflag == TF_REGULAR || header->typeflag == TF_UNKNOWN)
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header->nrecords = (header->size + RECORDSIZE-1)/RECORDSIZE;
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else
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header->nrecords = 0;
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return header;
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}
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/* Read the next block, assming it is a tar header. Returns a header
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object on success or NULL one error. In case of an error an error
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message has been printed. */
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static tar_header_t
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read_header (estream_t stream)
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{
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gpg_error_t err;
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char record[RECORDSIZE];
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int i;
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err = read_record (stream, record);
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if (err)
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return NULL;
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for (i=0; i < RECORDSIZE && !record[i]; i++)
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;
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if (i == RECORDSIZE)
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{
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/* All zero header - check whether it is the first part of an
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end of archive mark. */
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err = read_record (stream, record);
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if (err)
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return NULL;
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for (i=0; i < RECORDSIZE && !record[i]; i++)
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;
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if (i != RECORDSIZE)
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log_info ("%s: warning: skipping empty header\n",
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es_fname_get (stream));
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else
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{
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/* End of archive - FIXME: we might want to check for garbage. */
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return NULL;
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}
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}
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return parse_header (record, es_fname_get (stream));
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}
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/* Skip the data records according to HEADER. Prints an error message
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on error and return -1. */
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static int
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skip_data (estream_t stream, tar_header_t header)
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{
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char record[RECORDSIZE];
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unsigned long long n;
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for (n=0; n < header->nrecords; n++)
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{
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if (read_record (stream, record))
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return -1;
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}
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return 0;
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}
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static void
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print_header (tar_header_t header, estream_t out)
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{
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unsigned long mask;
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char modestr[10+1];
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int i;
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*modestr = '?';
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switch (header->typeflag)
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{
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case TF_REGULAR: *modestr = '-'; break;
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case TF_HARDLINK: *modestr = 'h'; break;
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case TF_SYMLINK: *modestr = 'l'; break;
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case TF_CHARDEV: *modestr = 'c'; break;
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case TF_BLOCKDEV: *modestr = 'b'; break;
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case TF_DIRECTORY:*modestr = 'd'; break;
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case TF_FIFO: *modestr = 'f'; break;
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case TF_RESERVED: *modestr = '='; break;
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case TF_UNKNOWN: break;
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case TF_NOTSUP: break;
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}
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for (mask = 0400, i = 0; i < 9; i++, mask >>= 1)
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modestr[1+i] = (header->mode & mask)? "rwxrwxrwx"[i]:'-';
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if ((header->typeflag & 04000))
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modestr[3] = modestr[3] == 'x'? 's':'S';
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if ((header->typeflag & 02000))
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modestr[6] = modestr[6] == 'x'? 's':'S';
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if ((header->typeflag & 01000))
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modestr[9] = modestr[9] == 'x'? 't':'T';
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modestr[10] = 0;
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es_fprintf (out, "%s %lu %lu/%lu %12llu %s %s\n",
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modestr, header->nlink, header->uid, header->gid, header->size,
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isotimestamp (header->mtime), header->name);
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}
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/* List the tarball FILENAME or, if FILENAME is NULL, the tarball read
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from stdin. */
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void
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gpgtar_list (const char *filename)
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{
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gpg_error_t err;
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estream_t stream;
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tar_header_t header;
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if (filename)
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{
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stream = es_fopen (filename, "rb");
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if (!stream)
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{
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err = gpg_error_from_syserror ();
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log_error ("error opening `%s': %s\n", filename, gpg_strerror (err));
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return;
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}
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}
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else
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stream = es_stdin; /* FIXME: How can we enforce binary mode? */
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for (;;)
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{
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header = read_header (stream);
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if (!header)
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goto leave;
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print_header (header, es_stdout);
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if (skip_data (stream, header))
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goto leave;
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xfree (header);
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header = NULL;
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}
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leave:
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xfree (header);
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if (filename)
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es_fclose (stream);
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return;
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}
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tar_header_t
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gpgtar_read_header (estream_t stream)
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{
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/*FIXME: Change to return an error code. */
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return read_header (stream);
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}
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void
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gpgtar_print_header (tar_header_t header, estream_t out)
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{
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if (header && out)
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print_header (header, out);
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}
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