Line data Source code
1 : /* gpgtar-list.c - List a TAR archive
2 : * Copyright (C) 2010 Free Software Foundation, Inc.
3 : *
4 : * This file is part of GnuPG.
5 : *
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.
10 : *
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.
15 : *
16 : * You should have received a copy of the GNU General Public License
17 : * along with this program; if not, see <https://www.gnu.org/licenses/>.
18 : */
19 :
20 : #include <config.h>
21 : #include <errno.h>
22 : #include <stdio.h>
23 : #include <stdlib.h>
24 : #include <string.h>
25 : #include <assert.h>
26 :
27 : #include "i18n.h"
28 : #include "gpgtar.h"
29 : #include "../common/exectool.h"
30 : #include "../common/ccparray.h"
31 :
32 :
33 :
34 : static unsigned long long
35 5930 : parse_xoctal (const void *data, size_t length, const char *filename)
36 : {
37 5930 : const unsigned char *p = data;
38 : unsigned long long value;
39 :
40 5930 : if (!length)
41 0 : value = 0;
42 5930 : else if ( (*p & 0x80))
43 : {
44 : /* Binary format. */
45 0 : value = (*p++ & 0x7f);
46 0 : while (--length)
47 : {
48 0 : value <<= 8;
49 0 : value |= *p++;
50 : }
51 : }
52 : else
53 : {
54 : /* Octal format */
55 5930 : value = 0;
56 : /* Skip leading spaces and zeroes. */
57 5930 : for (; length && (*p == ' ' || *p == '0'); length--, p++)
58 : ;
59 72972 : for (; length && *p; length--, p++)
60 : {
61 30556 : if (*p >= '0' && *p <= '7')
62 : {
63 30556 : value <<= 3;
64 30556 : value += (*p - '0');
65 : }
66 : else
67 : {
68 0 : log_error ("%s: invalid octal number encountered - assuming 0\n",
69 : filename);
70 0 : value = 0;
71 0 : break;
72 : }
73 : }
74 : }
75 5930 : return value;
76 : }
77 :
78 :
79 : static tar_header_t
80 1186 : parse_header (const void *record, const char *filename)
81 : {
82 1186 : const struct ustar_raw_header *raw = record;
83 : size_t n, namelen, prefixlen;
84 : tar_header_t header;
85 : int use_prefix;
86 :
87 2372 : use_prefix = (!memcmp (raw->magic, "ustar", 5)
88 1186 : && (raw->magic[5] == ' ' || !raw->magic[5]));
89 :
90 :
91 1186 : for (namelen=0; namelen < sizeof raw->name && raw->name[namelen]; namelen++)
92 : ;
93 1186 : if (namelen == sizeof raw->name)
94 0 : log_info ("%s: warning: name not terminated by a nul byte\n", filename);
95 74979 : for (n=namelen+1; n < sizeof raw->name; n++)
96 73793 : if (raw->name[n])
97 : {
98 0 : log_info ("%s: warning: garbage after name\n", filename);
99 0 : break;
100 : }
101 :
102 :
103 1186 : if (use_prefix && raw->prefix[0])
104 : {
105 0 : for (prefixlen=0; (prefixlen < sizeof raw->prefix
106 0 : && raw->prefix[prefixlen]); prefixlen++)
107 : ;
108 0 : if (prefixlen == sizeof raw->prefix)
109 0 : log_info ("%s: warning: prefix not terminated by a nul byte\n",
110 : filename);
111 0 : for (n=prefixlen+1; n < sizeof raw->prefix; n++)
112 0 : if (raw->prefix[n])
113 : {
114 0 : log_info ("%s: warning: garbage after prefix\n", filename);
115 0 : break;
116 : }
117 : }
118 : else
119 1186 : prefixlen = 0;
120 :
121 1186 : header = xtrycalloc (1, sizeof *header + prefixlen + 1 + namelen);
122 1186 : if (!header)
123 : {
124 0 : log_error ("%s: error allocating header: %s\n",
125 : filename, gpg_strerror (gpg_error_from_syserror ()));
126 0 : return NULL;
127 : }
128 1186 : if (prefixlen)
129 : {
130 0 : n = prefixlen;
131 0 : memcpy (header->name, raw->prefix, n);
132 0 : if (raw->prefix[n-1] != '/')
133 0 : header->name[n++] = '/';
134 : }
135 : else
136 1186 : n = 0;
137 1186 : memcpy (header->name+n, raw->name, namelen);
138 1186 : header->name[n+namelen] = 0;
139 :
140 1186 : header->mode = parse_xoctal (raw->mode, sizeof raw->mode, filename);
141 1186 : header->uid = parse_xoctal (raw->uid, sizeof raw->uid, filename);
142 1186 : header->gid = parse_xoctal (raw->gid, sizeof raw->gid, filename);
143 1186 : header->size = parse_xoctal (raw->size, sizeof raw->size, filename);
144 1186 : header->mtime = parse_xoctal (raw->mtime, sizeof raw->mtime, filename);
145 : /* checksum = */
146 1186 : switch (raw->typeflag[0])
147 : {
148 1121 : case '0': header->typeflag = TF_REGULAR; break;
149 0 : case '1': header->typeflag = TF_HARDLINK; break;
150 0 : case '2': header->typeflag = TF_SYMLINK; break;
151 0 : case '3': header->typeflag = TF_CHARDEV; break;
152 0 : case '4': header->typeflag = TF_BLOCKDEV; break;
153 65 : case '5': header->typeflag = TF_DIRECTORY; break;
154 0 : case '6': header->typeflag = TF_FIFO; break;
155 0 : case '7': header->typeflag = TF_RESERVED; break;
156 0 : default: header->typeflag = TF_UNKNOWN; break;
157 : }
158 :
159 :
160 : /* Compute the number of data records following this header. */
161 1186 : if (header->typeflag == TF_REGULAR || header->typeflag == TF_UNKNOWN)
162 1121 : header->nrecords = (header->size + RECORDSIZE-1)/RECORDSIZE;
163 : else
164 65 : header->nrecords = 0;
165 :
166 :
167 1186 : return header;
168 : }
169 :
170 :
171 :
172 : /* Read the next block, assming it is a tar header. Returns a header
173 : object on success in R_HEADER, or an error. If the stream is
174 : consumed, R_HEADER is set to NULL. In case of an error an error
175 : message has been printed. */
176 : static gpg_error_t
177 1239 : read_header (estream_t stream, tar_header_t *r_header)
178 : {
179 : gpg_error_t err;
180 : char record[RECORDSIZE];
181 : int i;
182 :
183 1239 : err = read_record (stream, record);
184 1239 : if (err)
185 0 : return err;
186 :
187 1239 : for (i=0; i < RECORDSIZE && !record[i]; i++)
188 : ;
189 1239 : if (i == RECORDSIZE)
190 : {
191 : /* All zero header - check whether it is the first part of an
192 : end of archive mark. */
193 53 : err = read_record (stream, record);
194 53 : if (err)
195 0 : return err;
196 :
197 53 : for (i=0; i < RECORDSIZE && !record[i]; i++)
198 : ;
199 53 : if (i != RECORDSIZE)
200 0 : log_info ("%s: warning: skipping empty header\n",
201 : es_fname_get (stream));
202 : else
203 : {
204 : /* End of archive - FIXME: we might want to check for garbage. */
205 53 : *r_header = NULL;
206 53 : return 0;
207 : }
208 : }
209 :
210 1186 : *r_header = parse_header (record, es_fname_get (stream));
211 1186 : return *r_header ? 0 : gpg_error_from_syserror ();
212 : }
213 :
214 :
215 : /* Skip the data records according to HEADER. Prints an error message
216 : on error and return -1. */
217 : static int
218 56 : skip_data (estream_t stream, tar_header_t header)
219 : {
220 : char record[RECORDSIZE];
221 : unsigned long long n;
222 :
223 2032 : for (n=0; n < header->nrecords; n++)
224 : {
225 1976 : if (read_record (stream, record))
226 0 : return -1;
227 : }
228 :
229 56 : return 0;
230 : }
231 :
232 :
233 :
234 : static void
235 56 : print_header (tar_header_t header, estream_t out)
236 : {
237 : unsigned long mask;
238 : char modestr[10+1];
239 : int i;
240 :
241 56 : *modestr = '?';
242 56 : switch (header->typeflag)
243 : {
244 56 : case TF_REGULAR: *modestr = '-'; break;
245 0 : case TF_HARDLINK: *modestr = 'h'; break;
246 0 : case TF_SYMLINK: *modestr = 'l'; break;
247 0 : case TF_CHARDEV: *modestr = 'c'; break;
248 0 : case TF_BLOCKDEV: *modestr = 'b'; break;
249 0 : case TF_DIRECTORY:*modestr = 'd'; break;
250 0 : case TF_FIFO: *modestr = 'f'; break;
251 0 : case TF_RESERVED: *modestr = '='; break;
252 0 : case TF_UNKNOWN: break;
253 0 : case TF_NOTSUP: break;
254 : }
255 560 : for (mask = 0400, i = 0; i < 9; i++, mask >>= 1)
256 504 : modestr[1+i] = (header->mode & mask)? "rwxrwxrwx"[i]:'-';
257 56 : if ((header->typeflag & 04000))
258 0 : modestr[3] = modestr[3] == 'x'? 's':'S';
259 56 : if ((header->typeflag & 02000))
260 0 : modestr[6] = modestr[6] == 'x'? 's':'S';
261 56 : if ((header->typeflag & 01000))
262 0 : modestr[9] = modestr[9] == 'x'? 't':'T';
263 56 : modestr[10] = 0;
264 :
265 56 : es_fprintf (out, "%s %lu %lu/%lu %12llu %s %s\n",
266 : modestr, header->nlink, header->uid, header->gid, header->size,
267 56 : isotimestamp (header->mtime), header->name);
268 56 : }
269 :
270 :
271 :
272 : /* List the tarball FILENAME or, if FILENAME is NULL, the tarball read
273 : from stdin. */
274 : gpg_error_t
275 8 : gpgtar_list (const char *filename, int decrypt)
276 : {
277 : gpg_error_t err;
278 : estream_t stream;
279 8 : estream_t cipher_stream = NULL;
280 8 : tar_header_t header = NULL;
281 :
282 8 : if (filename)
283 : {
284 8 : if (!strcmp (filename, "-"))
285 0 : stream = es_stdin;
286 : else
287 8 : stream = es_fopen (filename, "rb");
288 8 : if (!stream)
289 : {
290 0 : err = gpg_error_from_syserror ();
291 0 : log_error ("error opening '%s': %s\n", filename, gpg_strerror (err));
292 0 : return err;
293 : }
294 : }
295 : else
296 0 : stream = es_stdin;
297 :
298 8 : if (stream == es_stdin)
299 0 : es_set_binary (es_stdin);
300 :
301 8 : if (decrypt)
302 : {
303 : strlist_t arg;
304 : ccparray_t ccp;
305 : const char **argv;
306 :
307 6 : cipher_stream = stream;
308 6 : stream = es_fopenmem (0, "rwb");
309 6 : if (! stream)
310 : {
311 0 : err = gpg_error_from_syserror ();
312 0 : goto leave;
313 : }
314 :
315 6 : ccparray_init (&ccp, 0);
316 :
317 6 : ccparray_put (&ccp, "--decrypt");
318 21 : for (arg = opt.gpg_arguments; arg; arg = arg->next)
319 15 : ccparray_put (&ccp, arg->d);
320 :
321 6 : ccparray_put (&ccp, NULL);
322 6 : argv = ccparray_get (&ccp, NULL);
323 6 : if (!argv)
324 : {
325 0 : err = gpg_error_from_syserror ();
326 0 : goto leave;
327 : }
328 :
329 6 : err = gnupg_exec_tool_stream (opt.gpg_program, argv,
330 : cipher_stream, NULL, stream, NULL, NULL);
331 6 : xfree (argv);
332 6 : if (err)
333 0 : goto leave;
334 :
335 6 : err = es_fseek (stream, 0, SEEK_SET);
336 6 : if (err)
337 0 : goto leave;
338 : }
339 :
340 : for (;;)
341 : {
342 64 : err = read_header (stream, &header);
343 64 : if (err || header == NULL)
344 : goto leave;
345 :
346 56 : print_header (header, es_stdout);
347 :
348 56 : if (skip_data (stream, header))
349 0 : goto leave;
350 56 : xfree (header);
351 56 : header = NULL;
352 56 : }
353 :
354 :
355 : leave:
356 8 : xfree (header);
357 8 : if (stream != es_stdin)
358 8 : es_fclose (stream);
359 8 : if (stream != cipher_stream)
360 8 : es_fclose (cipher_stream);
361 8 : return err;
362 : }
363 :
364 : gpg_error_t
365 1175 : gpgtar_read_header (estream_t stream, tar_header_t *r_header)
366 : {
367 1175 : return read_header (stream, r_header);
368 : }
369 :
370 : void
371 0 : gpgtar_print_header (tar_header_t header, estream_t out)
372 : {
373 0 : if (header && out)
374 0 : print_header (header, out);
375 0 : }
|
