1 /* gpgtar-list.c - List a TAR archive
2 * Copyright (C) 2010 Free Software Foundation, Inc.
4 * This file is part of GnuPG.
6 * GnuPG is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or
9 * (at your option) any later version.
11 * GnuPG is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
29 #include "../common/exectool.h"
33 static unsigned long long
34 parse_xoctal (const void *data, size_t length, const char *filename)
36 const unsigned char *p = data;
37 unsigned long long value;
41 else if ( (*p & 0x80))
44 value = (*p++ & 0x7f);
55 /* Skip leading spaces and zeroes. */
56 for (; length && (*p == ' ' || *p == '0'); length--, p++)
58 for (; length && *p; length--, p++)
60 if (*p >= '0' && *p <= '7')
67 log_error ("%s: invalid octal number encountered - assuming 0\n",
79 parse_header (const void *record, const char *filename)
81 const struct ustar_raw_header *raw = record;
82 size_t n, namelen, prefixlen;
86 use_prefix = (!memcmp (raw->magic, "ustar", 5)
87 && (raw->magic[5] == ' ' || !raw->magic[5]));
90 for (namelen=0; namelen < sizeof raw->name && raw->name[namelen]; namelen++)
92 if (namelen == sizeof raw->name)
93 log_info ("%s: warning: name not terminated by a nul byte\n", filename);
94 for (n=namelen+1; n < sizeof raw->name; n++)
97 log_info ("%s: warning: garbage after name\n", filename);
102 if (use_prefix && raw->prefix[0])
104 for (prefixlen=0; (prefixlen < sizeof raw->prefix
105 && raw->prefix[prefixlen]); prefixlen++)
107 if (prefixlen == sizeof raw->prefix)
108 log_info ("%s: warning: prefix not terminated by a nul byte\n",
110 for (n=prefixlen+1; n < sizeof raw->prefix; n++)
113 log_info ("%s: warning: garbage after prefix\n", filename);
120 header = xtrycalloc (1, sizeof *header + prefixlen + 1 + namelen);
123 log_error ("%s: error allocating header: %s\n",
124 filename, gpg_strerror (gpg_error_from_syserror ()));
130 memcpy (header->name, raw->prefix, n);
131 if (raw->prefix[n-1] != '/')
132 header->name[n++] = '/';
136 memcpy (header->name+n, raw->name, namelen);
137 header->name[n+namelen] = 0;
139 header->mode = parse_xoctal (raw->mode, sizeof raw->mode, filename);
140 header->uid = parse_xoctal (raw->uid, sizeof raw->uid, filename);
141 header->gid = parse_xoctal (raw->gid, sizeof raw->gid, filename);
142 header->size = parse_xoctal (raw->size, sizeof raw->size, filename);
143 header->mtime = parse_xoctal (raw->mtime, sizeof raw->mtime, filename);
145 switch (raw->typeflag[0])
147 case '0': header->typeflag = TF_REGULAR; break;
148 case '1': header->typeflag = TF_HARDLINK; break;
149 case '2': header->typeflag = TF_SYMLINK; break;
150 case '3': header->typeflag = TF_CHARDEV; break;
151 case '4': header->typeflag = TF_BLOCKDEV; break;
152 case '5': header->typeflag = TF_DIRECTORY; break;
153 case '6': header->typeflag = TF_FIFO; break;
154 case '7': header->typeflag = TF_RESERVED; break;
155 default: header->typeflag = TF_UNKNOWN; break;
159 /* Compute the number of data records following this header. */
160 if (header->typeflag == TF_REGULAR || header->typeflag == TF_UNKNOWN)
161 header->nrecords = (header->size + RECORDSIZE-1)/RECORDSIZE;
163 header->nrecords = 0;
171 /* Read the next block, assming it is a tar header. Returns a header
172 object on success in R_HEADER, or an error. If the stream is
173 consumed, R_HEADER is set to NULL. In case of an error an error
174 message has been printed. */
176 read_header (estream_t stream, tar_header_t *r_header)
179 char record[RECORDSIZE];
182 err = read_record (stream, record);
186 for (i=0; i < RECORDSIZE && !record[i]; i++)
190 /* All zero header - check whether it is the first part of an
191 end of archive mark. */
192 err = read_record (stream, record);
196 for (i=0; i < RECORDSIZE && !record[i]; i++)
199 log_info ("%s: warning: skipping empty header\n",
200 es_fname_get (stream));
203 /* End of archive - FIXME: we might want to check for garbage. */
209 *r_header = parse_header (record, es_fname_get (stream));
210 return *r_header ? 0 : gpg_error_from_syserror ();
214 /* Skip the data records according to HEADER. Prints an error message
215 on error and return -1. */
217 skip_data (estream_t stream, tar_header_t header)
219 char record[RECORDSIZE];
220 unsigned long long n;
222 for (n=0; n < header->nrecords; n++)
224 if (read_record (stream, record))
234 print_header (tar_header_t header, estream_t out)
241 switch (header->typeflag)
243 case TF_REGULAR: *modestr = '-'; break;
244 case TF_HARDLINK: *modestr = 'h'; break;
245 case TF_SYMLINK: *modestr = 'l'; break;
246 case TF_CHARDEV: *modestr = 'c'; break;
247 case TF_BLOCKDEV: *modestr = 'b'; break;
248 case TF_DIRECTORY:*modestr = 'd'; break;
249 case TF_FIFO: *modestr = 'f'; break;
250 case TF_RESERVED: *modestr = '='; break;
251 case TF_UNKNOWN: break;
252 case TF_NOTSUP: break;
254 for (mask = 0400, i = 0; i < 9; i++, mask >>= 1)
255 modestr[1+i] = (header->mode & mask)? "rwxrwxrwx"[i]:'-';
256 if ((header->typeflag & 04000))
257 modestr[3] = modestr[3] == 'x'? 's':'S';
258 if ((header->typeflag & 02000))
259 modestr[6] = modestr[6] == 'x'? 's':'S';
260 if ((header->typeflag & 01000))
261 modestr[9] = modestr[9] == 'x'? 't':'T';
264 es_fprintf (out, "%s %lu %lu/%lu %12llu %s %s\n",
265 modestr, header->nlink, header->uid, header->gid, header->size,
266 isotimestamp (header->mtime), header->name);
271 /* List the tarball FILENAME or, if FILENAME is NULL, the tarball read
274 gpgtar_list (const char *filename, int decrypt)
278 estream_t cipher_stream = NULL;
279 tar_header_t header = NULL;
283 if (!strcmp (filename, "-"))
286 stream = es_fopen (filename, "rb");
289 err = gpg_error_from_syserror ();
290 log_error ("error opening '%s': %s\n", filename, gpg_strerror (err));
297 if (stream == es_stdin)
298 es_set_binary (es_stdin);
306 cipher_stream = stream;
307 stream = es_fopenmem (0, "rwb");
310 err = gpg_error_from_syserror ();
314 argv = xtrycalloc (strlist_length (opt.gpg_arguments) + 2,
318 err = gpg_error_from_syserror ();
322 argv[i++] = "--decrypt";
323 for (arg = opt.gpg_arguments; arg; arg = arg->next)
326 assert (i == strlist_length (opt.gpg_arguments) + 2);
328 err = gnupg_exec_tool_stream (opt.gpg_program, argv,
329 cipher_stream, stream);
334 err = es_fseek (stream, 0, SEEK_SET);
341 err = read_header (stream, &header);
342 if (err || header == NULL)
345 print_header (header, es_stdout);
347 if (skip_data (stream, header))
356 if (stream != es_stdin)
358 if (stream != cipher_stream)
359 es_fclose (cipher_stream);
364 gpgtar_read_header (estream_t stream, tar_header_t *r_header)
366 return read_header (stream, r_header);
370 gpgtar_print_header (tar_header_t header, estream_t out)
373 print_header (header, out);