Commit | Line | Data |
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ef1aa910 | 1 | /* -*- c-file-style: "linux" -*- |
91262d5d MP |
2 | |
3 | rsync -- fast file replication program | |
ef1aa910 MP |
4 | |
5 | Copyright (C) 1996-2000 by Andrew Tridgell | |
2f03f956 | 6 | Copyright (C) Paul Mackerras 1996 |
91262d5d | 7 | Copyright (C) 2002 by Martin Pool <mbp@samba.org> |
2f03f956 AT |
8 | |
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | */ | |
23 | ||
24 | #include "rsync.h" | |
25 | ||
26 | extern int verbose; | |
27 | extern int dry_run; | |
28 | extern int relative_paths; | |
29 | extern int preserve_links; | |
30 | extern int am_root; | |
31 | extern int preserve_devices; | |
32 | extern int preserve_hard_links; | |
33 | extern int update_only; | |
3d6feada | 34 | extern int opt_ignore_existing; |
2f03f956 AT |
35 | extern int block_size; |
36 | extern int csum_length; | |
37 | extern int ignore_times; | |
f83f0548 | 38 | extern int size_only; |
2f03f956 AT |
39 | extern int io_timeout; |
40 | extern int remote_version; | |
41 | extern int always_checksum; | |
5b56cc19 | 42 | extern int modify_window; |
60c8d7bc | 43 | extern char *compare_dest; |
2f03f956 AT |
44 | |
45 | ||
46 | /* choose whether to skip a particular file */ | |
47 | static int skip_file(char *fname, | |
48 | struct file_struct *file, STRUCT_STAT *st) | |
49 | { | |
50 | if (st->st_size != file->length) { | |
51 | return 0; | |
52 | } | |
53 | ||
54 | /* if always checksum is set then we use the checksum instead | |
55 | of the file time to determine whether to sync */ | |
56 | if (always_checksum && S_ISREG(st->st_mode)) { | |
57 | char sum[MD4_SUM_LENGTH]; | |
60c8d7bc DD |
58 | char fnamecmpdest[MAXPATHLEN]; |
59 | ||
60 | if (compare_dest != NULL) { | |
61 | if (access(fname, 0) != 0) { | |
8950ac03 | 62 | snprintf(fnamecmpdest,MAXPATHLEN,"%s/%s", |
60c8d7bc DD |
63 | compare_dest,fname); |
64 | fname = fnamecmpdest; | |
65 | } | |
66 | } | |
2f03f956 | 67 | file_checksum(fname,sum,st->st_size); |
f855a7d0 AT |
68 | if (remote_version < 21) { |
69 | return (memcmp(sum,file->sum,2) == 0); | |
70 | } else { | |
71 | return (memcmp(sum,file->sum,MD4_SUM_LENGTH) == 0); | |
72 | } | |
2f03f956 AT |
73 | } |
74 | ||
f83f0548 AT |
75 | if (size_only) { |
76 | return 1; | |
77 | } | |
78 | ||
2f03f956 AT |
79 | if (ignore_times) { |
80 | return 0; | |
81 | } | |
82 | ||
5b56cc19 | 83 | return (cmp_modtime(st->st_mtime,file->modtime) == 0); |
2f03f956 AT |
84 | } |
85 | ||
86 | ||
87 | /* use a larger block size for really big files */ | |
88 | static int adapt_block_size(struct file_struct *file, int bsize) | |
89 | { | |
90 | int ret; | |
91 | ||
92 | if (bsize != BLOCK_SIZE) return bsize; | |
93 | ||
94 | ret = file->length / (10000); /* rough heuristic */ | |
95 | ret = ret & ~15; /* multiple of 16 */ | |
96 | if (ret < bsize) ret = bsize; | |
97 | if (ret > CHUNK_SIZE/2) ret = CHUNK_SIZE/2; | |
98 | return ret; | |
99 | } | |
100 | ||
101 | ||
102 | /* | |
103 | send a sums struct down a fd | |
104 | */ | |
1707e0f9 | 105 | static void send_sums(struct sum_struct *s, int f_out) |
2f03f956 | 106 | { |
91262d5d MP |
107 | if (s) { |
108 | size_t i; | |
109 | ||
110 | /* tell the other guy how many we are going to be | |
111 | doing and how many bytes there are in the last | |
112 | chunk */ | |
113 | write_int(f_out, s->count); | |
114 | write_int(f_out, s->n); | |
115 | write_int(f_out, s->remainder); | |
116 | ||
117 | for (i = 0; i < s->count; i++) { | |
118 | write_int(f_out, s->sums[i].sum1); | |
119 | write_buf(f_out, s->sums[i].sum2, csum_length); | |
120 | } | |
121 | } else { | |
122 | /* we don't have checksums */ | |
123 | write_int(f_out, 0); | |
124 | write_int(f_out, block_size); | |
125 | write_int(f_out, 0); | |
f855a7d0 | 126 | } |
2f03f956 AT |
127 | } |
128 | ||
bceec82f MP |
129 | |
130 | /** | |
131 | * Perhaps we want to just send an empty checksum set for this file, | |
132 | * which will force the whole thing to be literally transferred. | |
133 | * | |
134 | * When do we do this? If the user's explicitly said they | |
135 | * want the whole thing, or if { they haven't explicitly | |
136 | * requested a delta, and it's local but not batch mode.} | |
137 | * | |
138 | * Whew. */ | |
139 | static BOOL disable_deltas_p(void) | |
140 | { | |
141 | extern int whole_file, no_whole_file; | |
142 | extern int local_server; | |
143 | extern int write_batch; | |
144 | ||
145 | assert(whole_file == 0 || whole_file == 1); | |
146 | ||
b8709f50 | 147 | /* whole_file and no_whole_file are never both on at the same time */ |
bceec82f MP |
148 | |
149 | if (whole_file) | |
150 | return True; | |
151 | else if (no_whole_file) | |
152 | return False; | |
153 | else if (write_batch) | |
154 | return False; | |
155 | else | |
156 | return local_server; | |
157 | } | |
158 | ||
159 | ||
e66dfd18 MP |
160 | /** |
161 | * Generate a stream of signatures/checksums that describe a buffer. | |
162 | * | |
163 | * Generate approximately one checksum every @p n bytes. | |
164 | * | |
165 | * @return Newly-allocated sum_struct | |
166 | **/ | |
167 | static struct sum_struct *generate_sums(struct map_struct *buf, OFF_T len, | |
168 | int n) | |
2f03f956 AT |
169 | { |
170 | int i; | |
171 | struct sum_struct *s; | |
172 | int count; | |
173 | int block_len = n; | |
e66dfd18 | 174 | int remainder = (len % block_len); |
2f03f956 AT |
175 | OFF_T offset = 0; |
176 | ||
e66dfd18 | 177 | count = (len + (block_len - 1)) / block_len; |
2f03f956 | 178 | |
e66dfd18 MP |
179 | s = (struct sum_struct *) malloc(sizeof(*s)); |
180 | if (!s) | |
181 | out_of_memory("generate_sums"); | |
2f03f956 AT |
182 | |
183 | s->count = count; | |
184 | s->remainder = remainder; | |
185 | s->n = n; | |
186 | s->flength = len; | |
187 | ||
e66dfd18 | 188 | if (count == 0) { |
2f03f956 AT |
189 | s->sums = NULL; |
190 | return s; | |
191 | } | |
192 | ||
67684d03 MP |
193 | if (verbose > 3) { |
194 | rprintf(FINFO, "count=%ld rem=%ld n=%ld flength=%.0f\n", | |
195 | (long) s->count, (long) s->remainder, | |
196 | (long) s->n, (double) s->flength); | |
197 | } | |
e66dfd18 MP |
198 | |
199 | s->sums = (struct sum_buf *) malloc(sizeof(s->sums[0]) * s->count); | |
200 | if (!s->sums) | |
201 | out_of_memory("generate_sums"); | |
2f03f956 | 202 | |
e66dfd18 MP |
203 | for (i = 0; i < count; i++) { |
204 | int n1 = MIN(len, n); | |
205 | char *map = map_ptr(buf, offset, n1); | |
2f03f956 | 206 | |
e66dfd18 MP |
207 | s->sums[i].sum1 = get_checksum1(map, n1); |
208 | get_checksum2(map, n1, s->sums[i].sum2); | |
2f03f956 AT |
209 | |
210 | s->sums[i].offset = offset; | |
211 | s->sums[i].len = n1; | |
212 | s->sums[i].i = i; | |
213 | ||
214 | if (verbose > 3) | |
e66dfd18 MP |
215 | rprintf(FINFO, |
216 | "chunk[%d] offset=%.0f len=%d sum1=%08x\n", | |
217 | i, (double) s->sums[i].offset, | |
218 | s->sums[i].len, s->sums[i].sum1); | |
2f03f956 AT |
219 | |
220 | len -= n1; | |
221 | offset += n1; | |
222 | } | |
223 | ||
224 | return s; | |
225 | } | |
226 | ||
227 | ||
ef1aa910 | 228 | |
420ef2c4 MP |
229 | /** |
230 | * Acts on file number @p i from @p flist, whose name is @p fname. | |
ef1aa910 MP |
231 | * |
232 | * First fixes up permissions, then generates checksums for the file. | |
233 | * | |
420ef2c4 MP |
234 | * @note This comment was added later by mbp who was trying to work it |
235 | * out. It might be wrong. | |
236 | **/ | |
237 | void recv_generator(char *fname, struct file_list *flist, int i, int f_out) | |
2f03f956 AT |
238 | { |
239 | int fd; | |
240 | STRUCT_STAT st; | |
241 | struct map_struct *buf; | |
242 | struct sum_struct *s; | |
243 | int statret; | |
244 | struct file_struct *file = flist->files[i]; | |
375a4556 DD |
245 | char *fnamecmp; |
246 | char fnamecmpbuf[MAXPATHLEN]; | |
247 | extern char *compare_dest; | |
f7632fc6 | 248 | extern int list_only; |
4df9f368 | 249 | extern int preserve_perms; |
1347d512 | 250 | extern int only_existing; |
b35d0d8e | 251 | extern int orig_umask; |
f7632fc6 AT |
252 | |
253 | if (list_only) return; | |
2f03f956 AT |
254 | |
255 | if (verbose > 2) | |
256 | rprintf(FINFO,"recv_generator(%s,%d)\n",fname,i); | |
257 | ||
258 | statret = link_stat(fname,&st); | |
63787382 | 259 | |
1347d512 AT |
260 | if (only_existing && statret == -1 && errno == ENOENT) { |
261 | /* we only want to update existing files */ | |
1bbd10fe | 262 | if (verbose > 1) rprintf(FINFO, "not creating new file \"%s\"\n",fname); |
1347d512 AT |
263 | return; |
264 | } | |
265 | ||
4df9f368 AT |
266 | if (statret == 0 && |
267 | !preserve_perms && | |
268 | (S_ISDIR(st.st_mode) == S_ISDIR(file->mode))) { | |
269 | /* if the file exists already and we aren't perserving | |
270 | presmissions then act as though the remote end sent | |
271 | us the file permissions we already have */ | |
7e0ca8e2 | 272 | file->mode = (file->mode & _S_IFMT) | (st.st_mode & ~_S_IFMT); |
4df9f368 AT |
273 | } |
274 | ||
2f03f956 | 275 | if (S_ISDIR(file->mode)) { |
a1b1b1da MP |
276 | /* The file to be received is a directory, so we need |
277 | * to prepare appropriately. If there is already a | |
278 | * file of that name and it is *not* a directory, then | |
279 | * we need to delete it. If it doesn't exist, then | |
280 | * recursively create it. */ | |
281 | ||
85d4d142 | 282 | if (dry_run) return; /* XXXX -- might cause inaccuracies?? -- mbp */ |
2f03f956 | 283 | if (statret == 0 && !S_ISDIR(st.st_mode)) { |
c7c11a0d | 284 | if (robust_unlink(fname) != 0) { |
85d4d142 MP |
285 | rprintf(FERROR, RSYNC_NAME |
286 | ": recv_generator: unlink \"%s\" to make room for directory: %s\n", | |
a1b1b1da | 287 | fname,strerror(errno)); |
2f03f956 AT |
288 | return; |
289 | } | |
290 | statret = -1; | |
291 | } | |
292 | if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) { | |
293 | if (!(relative_paths && errno==ENOENT && | |
b35d0d8e | 294 | create_directory_path(fname, orig_umask)==0 && |
2f03f956 | 295 | do_mkdir(fname,file->mode)==0)) { |
85d4d142 | 296 | rprintf(FERROR, RSYNC_NAME ": recv_generator: mkdir \"%s\": %s (2)\n", |
2f03f956 AT |
297 | fname,strerror(errno)); |
298 | } | |
299 | } | |
de343e3c DD |
300 | /* f_out is set to -1 when doing final directory |
301 | permission and modification time repair */ | |
302 | if (set_perms(fname,file,NULL,0) && verbose && (f_out != -1)) | |
2f03f956 AT |
303 | rprintf(FINFO,"%s/\n",fname); |
304 | return; | |
305 | } | |
306 | ||
307 | if (preserve_links && S_ISLNK(file->mode)) { | |
308 | #if SUPPORT_LINKS | |
309 | char lnk[MAXPATHLEN]; | |
310 | int l; | |
311 | extern int safe_symlinks; | |
312 | ||
313 | if (safe_symlinks && unsafe_symlink(file->link, fname)) { | |
314 | if (verbose) { | |
1bbd10fe | 315 | rprintf(FINFO,"ignoring unsafe symlink \"%s\" -> \"%s\"\n", |
2f03f956 AT |
316 | fname,file->link); |
317 | } | |
318 | return; | |
319 | } | |
320 | if (statret == 0) { | |
321 | l = readlink(fname,lnk,MAXPATHLEN-1); | |
322 | if (l > 0) { | |
323 | lnk[l] = 0; | |
85d4d142 MP |
324 | /* A link already pointing to the |
325 | * right place -- no further action | |
326 | * required. */ | |
7e0ca8e2 | 327 | if (strcmp(lnk,file->link) == 0) { |
2f03f956 AT |
328 | set_perms(fname,file,&st,1); |
329 | return; | |
330 | } | |
85d4d142 MP |
331 | } |
332 | /* Not a symlink, so delete whatever's | |
333 | * already there and put a new symlink | |
334 | * in place. */ | |
4b3977bf | 335 | delete_file(fname); |
2f03f956 | 336 | } |
2f03f956 | 337 | if (do_symlink(file->link,fname) != 0) { |
85d4d142 | 338 | rprintf(FERROR,RSYNC_NAME": symlink \"%s\" -> \"%s\": %s\n", |
2f03f956 AT |
339 | fname,file->link,strerror(errno)); |
340 | } else { | |
341 | set_perms(fname,file,NULL,0); | |
342 | if (verbose) { | |
1bbd10fe | 343 | rprintf(FINFO,"%s -> %s\n", fname,file->link); |
2f03f956 AT |
344 | } |
345 | } | |
346 | #endif | |
347 | return; | |
348 | } | |
349 | ||
350 | #ifdef HAVE_MKNOD | |
351 | if (am_root && preserve_devices && IS_DEVICE(file->mode)) { | |
352 | if (statret != 0 || | |
353 | st.st_mode != file->mode || | |
354 | st.st_rdev != file->rdev) { | |
355 | delete_file(fname); | |
356 | if (verbose > 2) | |
357 | rprintf(FINFO,"mknod(%s,0%o,0x%x)\n", | |
358 | fname,(int)file->mode,(int)file->rdev); | |
359 | if (do_mknod(fname,file->mode,file->rdev) != 0) { | |
360 | rprintf(FERROR,"mknod %s : %s\n",fname,strerror(errno)); | |
361 | } else { | |
362 | set_perms(fname,file,NULL,0); | |
363 | if (verbose) | |
364 | rprintf(FINFO,"%s\n",fname); | |
365 | } | |
366 | } else { | |
367 | set_perms(fname,file,&st,1); | |
368 | } | |
369 | return; | |
370 | } | |
371 | #endif | |
372 | ||
373 | if (preserve_hard_links && check_hard_link(file)) { | |
374 | if (verbose > 1) | |
fba31efb | 375 | rprintf(FINFO, "recv_generator: \"%s\" is a hard link\n",f_name(file)); |
2f03f956 AT |
376 | return; |
377 | } | |
378 | ||
379 | if (!S_ISREG(file->mode)) { | |
1bbd10fe | 380 | rprintf(FINFO, "skipping non-regular file \"%s\"\n",fname); |
2f03f956 AT |
381 | return; |
382 | } | |
383 | ||
375a4556 DD |
384 | fnamecmp = fname; |
385 | ||
386 | if ((statret == -1) && (compare_dest != NULL)) { | |
387 | /* try the file at compare_dest instead */ | |
388 | int saveerrno = errno; | |
8950ac03 | 389 | snprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",compare_dest,fname); |
375a4556 DD |
390 | statret = link_stat(fnamecmpbuf,&st); |
391 | if (!S_ISREG(st.st_mode)) | |
392 | statret = -1; | |
393 | if (statret == -1) | |
394 | errno = saveerrno; | |
395 | else | |
396 | fnamecmp = fnamecmpbuf; | |
397 | } | |
398 | ||
2f03f956 AT |
399 | if (statret == -1) { |
400 | if (errno == ENOENT) { | |
401 | write_int(f_out,i); | |
402 | if (!dry_run) send_sums(NULL,f_out); | |
403 | } else { | |
404 | if (verbose > 1) | |
fb47591d MP |
405 | rprintf(FERROR, RSYNC_NAME |
406 | ": recv_generator failed to open \"%s\": %s\n", | |
407 | fname, strerror(errno)); | |
2f03f956 AT |
408 | } |
409 | return; | |
410 | } | |
411 | ||
412 | if (!S_ISREG(st.st_mode)) { | |
413 | if (delete_file(fname) != 0) { | |
414 | return; | |
415 | } | |
416 | ||
417 | /* now pretend the file didn't exist */ | |
418 | write_int(f_out,i); | |
419 | if (!dry_run) send_sums(NULL,f_out); | |
420 | return; | |
421 | } | |
422 | ||
3d6feada MP |
423 | if (opt_ignore_existing && fnamecmp == fname) { |
424 | if (verbose > 1) | |
425 | rprintf(FINFO,"%s exists\n",fname); | |
426 | return; | |
427 | } | |
428 | ||
5b56cc19 | 429 | if (update_only && cmp_modtime(st.st_mtime,file->modtime)>0 && fnamecmp == fname) { |
2f03f956 AT |
430 | if (verbose > 1) |
431 | rprintf(FINFO,"%s is newer\n",fname); | |
432 | return; | |
433 | } | |
434 | ||
435 | if (skip_file(fname, file, &st)) { | |
bd4ed7f7 DD |
436 | if (fnamecmp == fname) |
437 | set_perms(fname,file,&st,1); | |
2f03f956 AT |
438 | return; |
439 | } | |
440 | ||
441 | if (dry_run) { | |
442 | write_int(f_out,i); | |
443 | return; | |
444 | } | |
445 | ||
bceec82f | 446 | if (disable_deltas_p()) { |
2f03f956 AT |
447 | write_int(f_out,i); |
448 | send_sums(NULL,f_out); | |
449 | return; | |
450 | } | |
451 | ||
452 | /* open the file */ | |
8c9fd200 | 453 | fd = do_open(fnamecmp, O_RDONLY, 0); |
2f03f956 AT |
454 | |
455 | if (fd == -1) { | |
85d4d142 | 456 | rprintf(FERROR,RSYNC_NAME": failed to open \"%s\", continuing : %s\n",fnamecmp,strerror(errno)); |
60be6acf DD |
457 | /* pretend the file didn't exist */ |
458 | write_int(f_out,i); | |
459 | send_sums(NULL,f_out); | |
2f03f956 AT |
460 | return; |
461 | } | |
462 | ||
463 | if (st.st_size > 0) { | |
464 | buf = map_file(fd,st.st_size); | |
465 | } else { | |
466 | buf = NULL; | |
467 | } | |
468 | ||
469 | if (verbose > 3) | |
5f808dfb | 470 | rprintf(FINFO,"gen mapped %s of size %.0f\n",fnamecmp,(double)st.st_size); |
2f03f956 AT |
471 | |
472 | s = generate_sums(buf,st.st_size,adapt_block_size(file, block_size)); | |
473 | ||
474 | if (verbose > 2) | |
475 | rprintf(FINFO,"sending sums for %d\n",i); | |
476 | ||
477 | write_int(f_out,i); | |
478 | send_sums(s,f_out); | |
479 | ||
480 | close(fd); | |
481 | if (buf) unmap_file(buf); | |
482 | ||
483 | free_sums(s); | |
484 | } | |
485 | ||
486 | ||
487 | ||
488 | void generate_files(int f,struct file_list *flist,char *local_name,int f_recv) | |
489 | { | |
490 | int i; | |
491 | int phase=0; | |
492 | ||
493 | if (verbose > 2) | |
494 | rprintf(FINFO,"generator starting pid=%d count=%d\n", | |
495 | (int)getpid(),flist->count); | |
496 | ||
3e7053ac MP |
497 | if (verbose >= 2) { |
498 | rprintf(FINFO, | |
499 | disable_deltas_p() | |
500 | ? "delta-transmission disabled for local transfer or --whole-file\n" | |
501 | : "delta transmission enabled\n"); | |
502 | } | |
503 | ||
a57873b7 AT |
504 | /* we expect to just sit around now, so don't exit on a |
505 | timeout. If we really get a timeout then the other process should | |
506 | exit */ | |
507 | io_timeout = 0; | |
508 | ||
2f03f956 AT |
509 | for (i = 0; i < flist->count; i++) { |
510 | struct file_struct *file = flist->files[i]; | |
511 | mode_t saved_mode = file->mode; | |
512 | if (!file->basename) continue; | |
513 | ||
514 | /* we need to ensure that any directories we create have writeable | |
515 | permissions initially so that we can create the files within | |
516 | them. This is then fixed after the files are transferred */ | |
517 | if (!am_root && S_ISDIR(file->mode)) { | |
518 | file->mode |= S_IWUSR; /* user write */ | |
a1b1b1da MP |
519 | /* XXX: Could this be causing a problem on SCO? Perhaps their |
520 | * handling of permissions is strange? */ | |
2f03f956 AT |
521 | } |
522 | ||
523 | recv_generator(local_name?local_name:f_name(file), | |
524 | flist,i,f); | |
525 | ||
526 | file->mode = saved_mode; | |
527 | } | |
528 | ||
529 | phase++; | |
530 | csum_length = SUM_LENGTH; | |
531 | ignore_times=1; | |
532 | ||
533 | if (verbose > 2) | |
534 | rprintf(FINFO,"generate_files phase=%d\n",phase); | |
535 | ||
536 | write_int(f,-1); | |
537 | ||
2f03f956 AT |
538 | if (remote_version >= 13) { |
539 | /* in newer versions of the protocol the files can cycle through | |
540 | the system more than once to catch initial checksum errors */ | |
541 | for (i=read_int(f_recv); i != -1; i=read_int(f_recv)) { | |
542 | struct file_struct *file = flist->files[i]; | |
543 | recv_generator(local_name?local_name:f_name(file), | |
544 | flist,i,f); | |
545 | } | |
546 | ||
547 | phase++; | |
548 | if (verbose > 2) | |
549 | rprintf(FINFO,"generate_files phase=%d\n",phase); | |
550 | ||
551 | write_int(f,-1); | |
552 | } | |
553 | } |