Line data Source code
1 : /*
2 : Bacula® - The Network Backup Solution
3 :
4 : Copyright (C) 2002-2009 Free Software Foundation Europe e.V.
5 :
6 : The main author of Bacula is Kern Sibbald, with contributions from
7 : many others, a complete list can be found in the file AUTHORS.
8 : This program is Free Software; you can redistribute it and/or
9 : modify it under the terms of version three of the GNU Affero General Public
10 : License as published by the Free Software Foundation and included
11 : in the file LICENSE.
12 :
13 : This program is distributed in the hope that it will be useful, but
14 : WITHOUT ANY WARRANTY; without even the implied warranty of
15 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 : General Public License for more details.
17 :
18 : You should have received a copy of the GNU Affero General Public License
19 : along with this program; if not, write to the Free Software
20 : Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 : 02110-1301, USA.
22 :
23 : Bacula® is a registered trademark of Kern Sibbald.
24 : The licensor of Bacula is the Free Software Foundation Europe
25 : (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
26 : Switzerland, email:ftf@fsfeurope.org.
27 : */
28 : /*
29 : * Encode and decode standard Unix attributes and
30 : * Extended attributes for Win32 and
31 : * other non-Unix systems, ...
32 : */
33 : /*
34 : * Some of these functions come from src/findlib/attribs.c in bacula-5.0.3.
35 : * Hence, the copyright notice above is retained.
36 : * Graham Keeling, 2014
37 : */
38 :
39 : #include "burp.h"
40 : #include "attribs.h"
41 : #include "alloc.h"
42 : #include "base64.h"
43 : #include "berrno.h"
44 : #include "cmd.h"
45 : #include "cntr.h"
46 : #include "log.h"
47 : #include "sbuf.h"
48 :
49 : // Encode a stat structure into a base64 character string.
50 95379 : int attribs_encode(struct sbuf *sb)
51 : {
52 : static char *p;
53 : static struct stat *statp;
54 :
55 95379 : if(!sb->attr.buf)
56 : {
57 95254 : sb->attr.cmd=CMD_ATTRIBS; // should not be needed
58 95254 : if(!(sb->attr.buf=(char *)malloc_w(256, __func__)))
59 : return -1;
60 : }
61 95379 : p=sb->attr.buf;
62 95379 : statp=&sb->statp;
63 :
64 95379 : if(sb->protocol2)
65 : {
66 : // Protocol1 does not have this field.
67 73445 : p += to_base64(sb->protocol2->index, p);
68 73445 : *p++ = ' ';
69 : // Protocol2 puts compression/encryption near the beginning.
70 73445 : p += to_base64(sb->compression, p);
71 73445 : *p++ = ' ';
72 73445 : p += to_base64(sb->encryption, p);
73 73445 : *p++ = ' ';
74 : }
75 95379 : p += to_base64(statp->st_dev, p);
76 95379 : *p++ = ' ';
77 95379 : p += to_base64(statp->st_ino, p);
78 95379 : *p++ = ' ';
79 95379 : p += to_base64(statp->st_mode, p);
80 95379 : *p++ = ' ';
81 95379 : p += to_base64(statp->st_nlink, p);
82 95379 : *p++ = ' ';
83 95379 : p += to_base64(statp->st_uid, p);
84 95379 : *p++ = ' ';
85 95379 : p += to_base64(statp->st_gid, p);
86 95379 : *p++ = ' ';
87 95379 : p += to_base64(statp->st_rdev, p);
88 95379 : *p++ = ' ';
89 95379 : p += to_base64(statp->st_size, p);
90 95379 : *p++ = ' ';
91 : #ifdef HAVE_WIN32
92 : p += to_base64(0, p); // place holder
93 : *p++ = ' ';
94 : p += to_base64(0, p); // place holder
95 : #else
96 95379 : p += to_base64(statp->st_blksize, p);
97 95379 : *p++ = ' ';
98 95379 : p += to_base64(statp->st_blocks, p);
99 : #endif
100 95379 : *p++ = ' ';
101 95379 : p += to_base64(statp->st_atime, p);
102 95379 : *p++ = ' ';
103 95379 : p += to_base64(statp->st_mtime, p);
104 95379 : *p++ = ' ';
105 95379 : p += to_base64(statp->st_ctime, p);
106 95379 : *p++ = ' ';
107 :
108 : #ifdef HAVE_CHFLAGS
109 : // chflags is a FreeBSD function.
110 : p += to_base64(statp->st_flags, p);
111 : #else
112 95379 : p += to_base64(0, p); // place holder
113 : #endif
114 95379 : *p++ = ' ';
115 :
116 95379 : p += to_base64(sb->winattr, p);
117 :
118 95379 : if(sb->protocol1)
119 : {
120 : // Protocol1 puts compression/encryption at the end.
121 21934 : *p++ = ' ';
122 21934 : p += to_base64(sb->compression, p);
123 21934 : *p++ = ' ';
124 21934 : p += to_base64(sb->encryption, p);
125 21934 : *p++ = ' ';
126 21934 : p += to_base64(sb->protocol1->salt, p);
127 : }
128 :
129 95379 : *p = 0;
130 :
131 95379 : sb->attr.len=p-sb->attr.buf;
132 :
133 95379 : return 0;
134 : }
135 :
136 : // Do casting according to unknown type to keep compiler happy.
137 : #define plug(st, val) st = (__typeof__(st))(val)
138 :
139 : // Decode a stat packet from base64 characters.
140 80762 : void attribs_decode(struct sbuf *sb)
141 : {
142 : static const char *p;
143 : static int64_t val;
144 : static struct stat *statp;
145 :
146 80762 : if(!(p=sb->attr.buf)) return;
147 80762 : statp=&sb->statp;
148 :
149 80762 : if(sb->protocol2)
150 : {
151 : // Protocol1 does not have this field.
152 57097 : p += from_base64(&val, p);
153 57097 : sb->protocol2->index=val;
154 57097 : p++;
155 : // Compression for protocol2.
156 57097 : p += from_base64(&val, p);
157 57097 : sb->compression=val;
158 57097 : p++;
159 : // Encryption for protocol2.
160 57097 : p += from_base64(&val, p);
161 57097 : sb->encryption=val;
162 57097 : p++;
163 : }
164 80762 : p += from_base64(&val, p);
165 80762 : plug(statp->st_dev, val);
166 80762 : p++;
167 80762 : p += from_base64(&val, p);
168 80762 : plug(statp->st_ino, val);
169 80762 : p++;
170 80762 : p += from_base64(&val, p);
171 80762 : plug(statp->st_mode, val);
172 80762 : p++;
173 80762 : p += from_base64(&val, p);
174 80762 : plug(statp->st_nlink, val);
175 80762 : p++;
176 80762 : p += from_base64(&val, p);
177 80762 : plug(statp->st_uid, val);
178 80762 : p++;
179 80762 : p += from_base64(&val, p);
180 80762 : plug(statp->st_gid, val);
181 80762 : p++;
182 80762 : p += from_base64(&val, p);
183 80762 : plug(statp->st_rdev, val);
184 80762 : p++;
185 80762 : p += from_base64(&val, p);
186 80762 : plug(statp->st_size, val);
187 80762 : p++;
188 80762 : p += from_base64(&val, p);
189 : #ifdef HAVE_WIN32
190 : // plug(statp->st_blksize, val);
191 : p++;
192 : p += from_base64(&val, p);
193 : // plug(statp->st_blocks, val);
194 : #else
195 80762 : plug(statp->st_blksize, val);
196 80762 : p++;
197 80762 : p += from_base64(&val, p);
198 80762 : plug(statp->st_blocks, val);
199 : #endif
200 80762 : p++;
201 80762 : p += from_base64(&val, p);
202 80762 : plug(statp->st_atime, val);
203 80762 : p++;
204 80762 : p += from_base64(&val, p);
205 80762 : plug(statp->st_mtime, val);
206 80762 : p++;
207 80762 : p += from_base64(&val, p);
208 80762 : plug(statp->st_ctime, val);
209 :
210 : // FreeBSD user flags.
211 80762 : if(*p == ' ' || (*p != 0 && *(p+1) == ' '))
212 : {
213 80744 : p++;
214 80744 : if(!*p) return;
215 80743 : p += from_base64(&val, p);
216 : #ifdef HAVE_CHFLAGS
217 : plug(statp->st_flags, val);
218 : }
219 : else
220 : {
221 : statp->st_flags = 0;
222 : #endif
223 : }
224 :
225 : // Look for winattr.
226 80761 : sb->winattr=0;
227 80761 : if(*p == ' ' || (*p != 0 && *(p+1) == ' '))
228 : {
229 80743 : p++;
230 80743 : p += from_base64(&val, p);
231 80743 : sb->winattr=val;
232 : }
233 :
234 80761 : if(sb->protocol1)
235 : {
236 23665 : sb->compression=-1;
237 23665 : sb->encryption=ENCRYPTION_UNSET;
238 :
239 : // Compression for protocol1.
240 23665 : if(*p == ' ' || (*p != 0 && *(p+1) == ' '))
241 : {
242 23656 : p++;
243 23656 : if(!*p) return;
244 23656 : p += from_base64(&val, p);
245 23656 : sb->compression=val;
246 : }
247 :
248 : // Encryption for protocol1.
249 23665 : if(*p == ' ' || (*p != 0 && *(p+1) == ' '))
250 : {
251 23656 : p++;
252 23656 : if(!*p) return;
253 23656 : p += from_base64(&val, p);
254 23656 : sb->encryption=val;
255 : }
256 :
257 : // Salt for protocol1.
258 23665 : if(*p == ' ' || (*p != 0 && *(p+1) == ' '))
259 : {
260 23656 : p++;
261 23656 : if(!*p) return;
262 23656 : p += from_base64(&val, p);
263 23656 : sb->protocol1->salt=val;
264 : }
265 : }
266 : }
267 :
268 28 : int attribs_set_file_times(struct asfd *asfd,
269 : const char *path, struct stat *statp,
270 : struct cntr *cntr)
271 : {
272 : int e;
273 :
274 : #ifdef HAVE_WIN32
275 : // You (probably) cannot set times on Windows junction points.
276 : if(statp->st_rdev==WIN32_JUNCTION_POINT)
277 : return 0;
278 :
279 : // The mingw64 utime() appears not to work on read-only files.
280 : // Use the utime() from bacula instead.
281 : e=win32_utime(path, statp);
282 : #elif HAVE_LUTIMES
283 : struct timeval t[2];
284 28 : t[0].tv_sec = statp->st_atime;
285 28 : t[0].tv_usec = 0;
286 28 : t[1].tv_sec = statp->st_mtime;
287 28 : t[1].tv_usec = 0;
288 28 : e=lutimes(path, t);
289 : #else
290 : struct timespec ts[2];
291 : ts[0].tv_sec=statp->st_atime;
292 : ts[0].tv_nsec=0;
293 : ts[1].tv_sec=statp->st_mtime;
294 : ts[1].tv_nsec=0;
295 : e=utimensat(AT_FDCWD, path, ts, AT_SYMLINK_NOFOLLOW);
296 : #endif
297 28 : if(e<0)
298 : {
299 : struct berrno be;
300 0 : berrno_init(&be);
301 0 : logw(asfd, cntr, "Unable to set file times %s: ERR=%s\n",
302 0 : path, berrno_bstrerror(&be, errno));
303 : return -1;
304 : }
305 : return 0;
306 : }
307 :
308 17034 : uint64_t decode_file_no(struct iobuf *iobuf)
309 : {
310 : int64_t val;
311 17034 : from_base64(&val, iobuf->buf);
312 17034 : return (uint64_t)val;
313 : }
314 :
315 0 : uint64_t decode_file_no_and_save_path(struct iobuf *iobuf, char **save_path)
316 : {
317 : int64_t val;
318 0 : char *p=iobuf->buf;
319 0 : p+=from_base64(&val, iobuf->buf);
320 0 : *save_path=p+1;
321 0 : return (uint64_t)val;
322 : }
323 :
324 28 : int attribs_set(struct asfd *asfd, const char *path,
325 : struct stat *statp, uint64_t winattr, struct cntr *cntr)
326 : {
327 : #ifdef HAVE_WIN32
328 : win32_chmod(path, statp->st_mode, winattr);
329 : attribs_set_file_times(asfd, path, statp, cntr);
330 : return 0;
331 : #endif
332 :
333 28 : if(lchown(path, statp->st_uid, statp->st_gid)<0)
334 : {
335 : struct berrno be;
336 0 : berrno_init(&be);
337 0 : char msg[256]="";
338 :
339 0 : snprintf(msg, sizeof(msg),
340 : "Unable to set file owner of %s to %d:%d: ERR=%s",
341 : path, statp->st_uid, statp->st_gid,
342 0 : berrno_bstrerror(&be, errno));
343 :
344 0 : if(errno==EPERM)
345 : {
346 : static int do_owner_warning=1;
347 0 : if(getuid()!=0)
348 : {
349 0 : if(!do_owner_warning)
350 : return -1;
351 :
352 0 : logw(asfd, cntr, "%s - possibly because you are not root. Will suppress subsequent messages of this type.\n", msg);
353 0 : do_owner_warning=0;
354 0 : return -1;
355 : }
356 : }
357 0 : logw(asfd, cntr, "%s\n", msg);
358 :
359 0 : return -1;
360 : }
361 :
362 : /* Watch out, a metadata restore will have cmd set to CMD_METADATA or
363 : CMD_ENC_META, but that is OK at the moment because we are not doing
364 : meta stuff on links. */
365 28 : if(S_ISLNK(statp->st_mode))
366 : {
367 0 : if(attribs_set_file_times(asfd, path, statp, cntr))
368 : return -1;
369 : }
370 : else
371 : {
372 28 : if(chmod(path, statp->st_mode) < 0)
373 : {
374 : struct berrno be;
375 0 : berrno_init(&be);
376 0 : logw(asfd, cntr,
377 : "Unable to set file modes %s: ERR=%s\n",
378 0 : path, berrno_bstrerror(&be, errno));
379 : return -1;
380 : }
381 :
382 28 : if(attribs_set_file_times(asfd, path, statp, cntr))
383 : return -1;
384 : #ifdef HAVE_CHFLAGS
385 : /*
386 : * FreeBSD user flags
387 : *
388 : * Note, this should really be done before the utime() above,
389 : * but if the immutable bit is set, it will make the utimes()
390 : * fail.
391 : */
392 : if(chflags(path, statp->st_flags)<0)
393 : {
394 : struct berrno be;
395 : berrno_init(&be);
396 : logw(asfd, cntr,
397 : "Unable to set file flags %s: ERR=%s\n",
398 : path, berrno_bstrerror(&be, errno));
399 : return -1;
400 : }
401 : #endif
402 : }
403 :
404 : return 0;
405 : }
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