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; |
59c95e42 | 44 | extern int link_dest; |
2f03f956 AT |
45 | |
46 | ||
47 | /* choose whether to skip a particular file */ | |
48 | static int skip_file(char *fname, | |
49 | struct file_struct *file, STRUCT_STAT *st) | |
50 | { | |
51 | if (st->st_size != file->length) { | |
52 | return 0; | |
53 | } | |
59c95e42 DD |
54 | if (link_dest) { |
55 | if((st->st_mode & ~_S_IFMT) != (file->mode & ~_S_IFMT)) { | |
56 | return 0; | |
57 | } | |
58 | if (st->st_uid != file->uid || st->st_gid != file->gid) { | |
59 | return 0; | |
60 | } | |
61 | } | |
62 | ||
2f03f956 AT |
63 | |
64 | /* if always checksum is set then we use the checksum instead | |
65 | of the file time to determine whether to sync */ | |
66 | if (always_checksum && S_ISREG(st->st_mode)) { | |
67 | char sum[MD4_SUM_LENGTH]; | |
60c8d7bc DD |
68 | char fnamecmpdest[MAXPATHLEN]; |
69 | ||
70 | if (compare_dest != NULL) { | |
71 | if (access(fname, 0) != 0) { | |
8950ac03 | 72 | snprintf(fnamecmpdest,MAXPATHLEN,"%s/%s", |
60c8d7bc DD |
73 | compare_dest,fname); |
74 | fname = fnamecmpdest; | |
75 | } | |
76 | } | |
2f03f956 | 77 | file_checksum(fname,sum,st->st_size); |
f855a7d0 AT |
78 | if (remote_version < 21) { |
79 | return (memcmp(sum,file->sum,2) == 0); | |
80 | } else { | |
81 | return (memcmp(sum,file->sum,MD4_SUM_LENGTH) == 0); | |
82 | } | |
2f03f956 AT |
83 | } |
84 | ||
f83f0548 AT |
85 | if (size_only) { |
86 | return 1; | |
87 | } | |
88 | ||
2f03f956 AT |
89 | if (ignore_times) { |
90 | return 0; | |
91 | } | |
92 | ||
5b56cc19 | 93 | return (cmp_modtime(st->st_mtime,file->modtime) == 0); |
2f03f956 AT |
94 | } |
95 | ||
96 | ||
97 | /* use a larger block size for really big files */ | |
98 | static int adapt_block_size(struct file_struct *file, int bsize) | |
99 | { | |
100 | int ret; | |
101 | ||
102 | if (bsize != BLOCK_SIZE) return bsize; | |
103 | ||
104 | ret = file->length / (10000); /* rough heuristic */ | |
105 | ret = ret & ~15; /* multiple of 16 */ | |
106 | if (ret < bsize) ret = bsize; | |
107 | if (ret > CHUNK_SIZE/2) ret = CHUNK_SIZE/2; | |
108 | return ret; | |
109 | } | |
110 | ||
111 | ||
112 | /* | |
80605142 | 113 | send a header that says "we have no checksums" down the f_out fd |
2f03f956 | 114 | */ |
80605142 | 115 | static void send_null_sums(int f_out) |
2f03f956 | 116 | { |
80605142 WD |
117 | write_int(f_out, 0); |
118 | write_int(f_out, block_size); | |
119 | write_int(f_out, 0); | |
2f03f956 AT |
120 | } |
121 | ||
bceec82f | 122 | |
80605142 | 123 | |
bceec82f MP |
124 | /** |
125 | * Perhaps we want to just send an empty checksum set for this file, | |
126 | * which will force the whole thing to be literally transferred. | |
127 | * | |
128 | * When do we do this? If the user's explicitly said they | |
129 | * want the whole thing, or if { they haven't explicitly | |
130 | * requested a delta, and it's local but not batch mode.} | |
131 | * | |
132 | * Whew. */ | |
133 | static BOOL disable_deltas_p(void) | |
134 | { | |
135 | extern int whole_file, no_whole_file; | |
136 | extern int local_server; | |
137 | extern int write_batch; | |
138 | ||
139 | assert(whole_file == 0 || whole_file == 1); | |
140 | ||
b8709f50 | 141 | /* whole_file and no_whole_file are never both on at the same time */ |
bceec82f MP |
142 | |
143 | if (whole_file) | |
144 | return True; | |
145 | else if (no_whole_file) | |
146 | return False; | |
147 | else if (write_batch) | |
148 | return False; | |
149 | else | |
150 | return local_server; | |
151 | } | |
152 | ||
153 | ||
80605142 WD |
154 | /* |
155 | * Generate and send a stream of signatures/checksums that describe a buffer | |
e66dfd18 | 156 | * |
80605142 WD |
157 | * Generate approximately one checksum every block_len bytes. |
158 | */ | |
159 | static void generate_and_send_sums(struct map_struct *buf, OFF_T len, | |
160 | int block_len, int f_out) | |
2f03f956 | 161 | { |
80605142 WD |
162 | size_t i; |
163 | struct sum_struct sum; | |
2f03f956 AT |
164 | OFF_T offset = 0; |
165 | ||
80605142 WD |
166 | sum.count = (len + (block_len - 1)) / block_len; |
167 | sum.remainder = (len % block_len); | |
168 | sum.n = block_len; | |
169 | sum.flength = len; | |
170 | /* not needed here sum.sums = NULL; */ | |
2f03f956 | 171 | |
80605142 | 172 | if (sum.count && verbose > 3) { |
67684d03 | 173 | rprintf(FINFO, "count=%ld rem=%ld n=%ld flength=%.0f\n", |
80605142 WD |
174 | (long) sum.count, (long) sum.remainder, |
175 | (long) sum.n, (double) sum.flength); | |
67684d03 | 176 | } |
e66dfd18 | 177 | |
80605142 WD |
178 | write_int(f_out, sum.count); |
179 | write_int(f_out, sum.n); | |
180 | write_int(f_out, sum.remainder); | |
2f03f956 | 181 | |
80605142 WD |
182 | for (i = 0; i < sum.count; i++) { |
183 | int n1 = MIN(len, block_len); | |
e66dfd18 | 184 | char *map = map_ptr(buf, offset, n1); |
80605142 WD |
185 | uint32 sum1 = get_checksum1(map, n1); |
186 | char sum2[SUM_LENGTH]; | |
2f03f956 | 187 | |
80605142 | 188 | get_checksum2(map, n1, sum2); |
2f03f956 | 189 | |
80605142 | 190 | if (verbose > 3) { |
e66dfd18 | 191 | rprintf(FINFO, |
80605142 WD |
192 | "chunk[%d] offset=%.0f len=%d sum1=%08lx\n", |
193 | i, (double) offset, n1, (unsigned long) sum1); | |
194 | } | |
195 | write_int(f_out, sum1); | |
196 | write_buf(f_out, sum2, csum_length); | |
2f03f956 AT |
197 | len -= n1; |
198 | offset += n1; | |
199 | } | |
2f03f956 AT |
200 | } |
201 | ||
202 | ||
ef1aa910 | 203 | |
420ef2c4 MP |
204 | /** |
205 | * Acts on file number @p i from @p flist, whose name is @p fname. | |
ef1aa910 MP |
206 | * |
207 | * First fixes up permissions, then generates checksums for the file. | |
208 | * | |
420ef2c4 MP |
209 | * @note This comment was added later by mbp who was trying to work it |
210 | * out. It might be wrong. | |
211 | **/ | |
212 | void recv_generator(char *fname, struct file_list *flist, int i, int f_out) | |
2f03f956 AT |
213 | { |
214 | int fd; | |
215 | STRUCT_STAT st; | |
216 | struct map_struct *buf; | |
2f03f956 AT |
217 | int statret; |
218 | struct file_struct *file = flist->files[i]; | |
375a4556 DD |
219 | char *fnamecmp; |
220 | char fnamecmpbuf[MAXPATHLEN]; | |
221 | extern char *compare_dest; | |
f7632fc6 | 222 | extern int list_only; |
4df9f368 | 223 | extern int preserve_perms; |
1347d512 | 224 | extern int only_existing; |
b35d0d8e | 225 | extern int orig_umask; |
f7632fc6 AT |
226 | |
227 | if (list_only) return; | |
2f03f956 AT |
228 | |
229 | if (verbose > 2) | |
230 | rprintf(FINFO,"recv_generator(%s,%d)\n",fname,i); | |
231 | ||
232 | statret = link_stat(fname,&st); | |
63787382 | 233 | |
1347d512 AT |
234 | if (only_existing && statret == -1 && errno == ENOENT) { |
235 | /* we only want to update existing files */ | |
1bbd10fe | 236 | if (verbose > 1) rprintf(FINFO, "not creating new file \"%s\"\n",fname); |
1347d512 AT |
237 | return; |
238 | } | |
239 | ||
4df9f368 AT |
240 | if (statret == 0 && |
241 | !preserve_perms && | |
242 | (S_ISDIR(st.st_mode) == S_ISDIR(file->mode))) { | |
243 | /* if the file exists already and we aren't perserving | |
244 | presmissions then act as though the remote end sent | |
245 | us the file permissions we already have */ | |
7e0ca8e2 | 246 | file->mode = (file->mode & _S_IFMT) | (st.st_mode & ~_S_IFMT); |
4df9f368 AT |
247 | } |
248 | ||
2f03f956 | 249 | if (S_ISDIR(file->mode)) { |
a1b1b1da MP |
250 | /* The file to be received is a directory, so we need |
251 | * to prepare appropriately. If there is already a | |
252 | * file of that name and it is *not* a directory, then | |
253 | * we need to delete it. If it doesn't exist, then | |
254 | * recursively create it. */ | |
255 | ||
85d4d142 | 256 | if (dry_run) return; /* XXXX -- might cause inaccuracies?? -- mbp */ |
2f03f956 | 257 | if (statret == 0 && !S_ISDIR(st.st_mode)) { |
c7c11a0d | 258 | if (robust_unlink(fname) != 0) { |
85d4d142 MP |
259 | rprintf(FERROR, RSYNC_NAME |
260 | ": recv_generator: unlink \"%s\" to make room for directory: %s\n", | |
a1b1b1da | 261 | fname,strerror(errno)); |
2f03f956 AT |
262 | return; |
263 | } | |
264 | statret = -1; | |
265 | } | |
266 | if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) { | |
267 | if (!(relative_paths && errno==ENOENT && | |
b35d0d8e | 268 | create_directory_path(fname, orig_umask)==0 && |
2f03f956 | 269 | do_mkdir(fname,file->mode)==0)) { |
85d4d142 | 270 | rprintf(FERROR, RSYNC_NAME ": recv_generator: mkdir \"%s\": %s (2)\n", |
2f03f956 AT |
271 | fname,strerror(errno)); |
272 | } | |
273 | } | |
de343e3c DD |
274 | /* f_out is set to -1 when doing final directory |
275 | permission and modification time repair */ | |
276 | if (set_perms(fname,file,NULL,0) && verbose && (f_out != -1)) | |
2f03f956 AT |
277 | rprintf(FINFO,"%s/\n",fname); |
278 | return; | |
279 | } | |
280 | ||
281 | if (preserve_links && S_ISLNK(file->mode)) { | |
282 | #if SUPPORT_LINKS | |
283 | char lnk[MAXPATHLEN]; | |
284 | int l; | |
285 | extern int safe_symlinks; | |
286 | ||
287 | if (safe_symlinks && unsafe_symlink(file->link, fname)) { | |
288 | if (verbose) { | |
1bbd10fe | 289 | rprintf(FINFO,"ignoring unsafe symlink \"%s\" -> \"%s\"\n", |
2f03f956 AT |
290 | fname,file->link); |
291 | } | |
292 | return; | |
293 | } | |
294 | if (statret == 0) { | |
295 | l = readlink(fname,lnk,MAXPATHLEN-1); | |
296 | if (l > 0) { | |
297 | lnk[l] = 0; | |
85d4d142 MP |
298 | /* A link already pointing to the |
299 | * right place -- no further action | |
300 | * required. */ | |
7e0ca8e2 | 301 | if (strcmp(lnk,file->link) == 0) { |
2f03f956 AT |
302 | set_perms(fname,file,&st,1); |
303 | return; | |
304 | } | |
85d4d142 MP |
305 | } |
306 | /* Not a symlink, so delete whatever's | |
307 | * already there and put a new symlink | |
308 | * in place. */ | |
4b3977bf | 309 | delete_file(fname); |
2f03f956 | 310 | } |
2f03f956 | 311 | if (do_symlink(file->link,fname) != 0) { |
85d4d142 | 312 | rprintf(FERROR,RSYNC_NAME": symlink \"%s\" -> \"%s\": %s\n", |
2f03f956 AT |
313 | fname,file->link,strerror(errno)); |
314 | } else { | |
315 | set_perms(fname,file,NULL,0); | |
316 | if (verbose) { | |
1bbd10fe | 317 | rprintf(FINFO,"%s -> %s\n", fname,file->link); |
2f03f956 AT |
318 | } |
319 | } | |
320 | #endif | |
321 | return; | |
322 | } | |
323 | ||
324 | #ifdef HAVE_MKNOD | |
325 | if (am_root && preserve_devices && IS_DEVICE(file->mode)) { | |
326 | if (statret != 0 || | |
327 | st.st_mode != file->mode || | |
328 | st.st_rdev != file->rdev) { | |
329 | delete_file(fname); | |
330 | if (verbose > 2) | |
331 | rprintf(FINFO,"mknod(%s,0%o,0x%x)\n", | |
332 | fname,(int)file->mode,(int)file->rdev); | |
333 | if (do_mknod(fname,file->mode,file->rdev) != 0) { | |
334 | rprintf(FERROR,"mknod %s : %s\n",fname,strerror(errno)); | |
335 | } else { | |
336 | set_perms(fname,file,NULL,0); | |
337 | if (verbose) | |
338 | rprintf(FINFO,"%s\n",fname); | |
339 | } | |
340 | } else { | |
341 | set_perms(fname,file,&st,1); | |
342 | } | |
343 | return; | |
344 | } | |
345 | #endif | |
346 | ||
347 | if (preserve_hard_links && check_hard_link(file)) { | |
348 | if (verbose > 1) | |
fba31efb | 349 | rprintf(FINFO, "recv_generator: \"%s\" is a hard link\n",f_name(file)); |
2f03f956 AT |
350 | return; |
351 | } | |
352 | ||
353 | if (!S_ISREG(file->mode)) { | |
1bbd10fe | 354 | rprintf(FINFO, "skipping non-regular file \"%s\"\n",fname); |
2f03f956 AT |
355 | return; |
356 | } | |
357 | ||
375a4556 DD |
358 | fnamecmp = fname; |
359 | ||
360 | if ((statret == -1) && (compare_dest != NULL)) { | |
361 | /* try the file at compare_dest instead */ | |
362 | int saveerrno = errno; | |
8950ac03 | 363 | snprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",compare_dest,fname); |
375a4556 DD |
364 | statret = link_stat(fnamecmpbuf,&st); |
365 | if (!S_ISREG(st.st_mode)) | |
366 | statret = -1; | |
367 | if (statret == -1) | |
368 | errno = saveerrno; | |
59c95e42 DD |
369 | #if HAVE_LINK |
370 | else if (link_dest && !dry_run) { | |
371 | if (do_link(fnamecmpbuf, fname) != 0) { | |
372 | if (verbose > 0) | |
373 | rprintf(FINFO,"link %s => %s : %s\n", | |
374 | fnamecmpbuf, | |
375 | fname, | |
376 | strerror(errno)); | |
377 | } | |
378 | fnamecmp = fnamecmpbuf; | |
379 | } | |
380 | #endif | |
375a4556 DD |
381 | else |
382 | fnamecmp = fnamecmpbuf; | |
383 | } | |
384 | ||
2f03f956 AT |
385 | if (statret == -1) { |
386 | if (errno == ENOENT) { | |
387 | write_int(f_out,i); | |
80605142 | 388 | if (!dry_run) send_null_sums(f_out); |
2f03f956 AT |
389 | } else { |
390 | if (verbose > 1) | |
fb47591d MP |
391 | rprintf(FERROR, RSYNC_NAME |
392 | ": recv_generator failed to open \"%s\": %s\n", | |
393 | fname, strerror(errno)); | |
2f03f956 AT |
394 | } |
395 | return; | |
396 | } | |
397 | ||
398 | if (!S_ISREG(st.st_mode)) { | |
399 | if (delete_file(fname) != 0) { | |
400 | return; | |
401 | } | |
402 | ||
403 | /* now pretend the file didn't exist */ | |
404 | write_int(f_out,i); | |
80605142 | 405 | if (!dry_run) send_null_sums(f_out); |
2f03f956 AT |
406 | return; |
407 | } | |
408 | ||
3d6feada MP |
409 | if (opt_ignore_existing && fnamecmp == fname) { |
410 | if (verbose > 1) | |
411 | rprintf(FINFO,"%s exists\n",fname); | |
412 | return; | |
413 | } | |
414 | ||
5b56cc19 | 415 | if (update_only && cmp_modtime(st.st_mtime,file->modtime)>0 && fnamecmp == fname) { |
2f03f956 AT |
416 | if (verbose > 1) |
417 | rprintf(FINFO,"%s is newer\n",fname); | |
418 | return; | |
419 | } | |
420 | ||
421 | if (skip_file(fname, file, &st)) { | |
bd4ed7f7 DD |
422 | if (fnamecmp == fname) |
423 | set_perms(fname,file,&st,1); | |
2f03f956 AT |
424 | return; |
425 | } | |
426 | ||
427 | if (dry_run) { | |
428 | write_int(f_out,i); | |
429 | return; | |
430 | } | |
431 | ||
bceec82f | 432 | if (disable_deltas_p()) { |
2f03f956 | 433 | write_int(f_out,i); |
80605142 | 434 | send_null_sums(f_out); |
2f03f956 AT |
435 | return; |
436 | } | |
437 | ||
438 | /* open the file */ | |
8c9fd200 | 439 | fd = do_open(fnamecmp, O_RDONLY, 0); |
2f03f956 AT |
440 | |
441 | if (fd == -1) { | |
85d4d142 | 442 | rprintf(FERROR,RSYNC_NAME": failed to open \"%s\", continuing : %s\n",fnamecmp,strerror(errno)); |
60be6acf DD |
443 | /* pretend the file didn't exist */ |
444 | write_int(f_out,i); | |
80605142 | 445 | send_null_sums(f_out); |
2f03f956 AT |
446 | return; |
447 | } | |
448 | ||
449 | if (st.st_size > 0) { | |
450 | buf = map_file(fd,st.st_size); | |
451 | } else { | |
452 | buf = NULL; | |
453 | } | |
454 | ||
455 | if (verbose > 3) | |
5f808dfb | 456 | rprintf(FINFO,"gen mapped %s of size %.0f\n",fnamecmp,(double)st.st_size); |
2f03f956 | 457 | |
2f03f956 | 458 | if (verbose > 2) |
80605142 | 459 | rprintf(FINFO, "generating and sending sums for %d\n", i); |
2f03f956 AT |
460 | |
461 | write_int(f_out,i); | |
80605142 WD |
462 | generate_and_send_sums(buf, st.st_size, |
463 | adapt_block_size(file, block_size), f_out); | |
2f03f956 AT |
464 | |
465 | close(fd); | |
466 | if (buf) unmap_file(buf); | |
2f03f956 AT |
467 | } |
468 | ||
469 | ||
470 | ||
471 | void generate_files(int f,struct file_list *flist,char *local_name,int f_recv) | |
472 | { | |
473 | int i; | |
474 | int phase=0; | |
475 | ||
476 | if (verbose > 2) | |
477 | rprintf(FINFO,"generator starting pid=%d count=%d\n", | |
478 | (int)getpid(),flist->count); | |
479 | ||
3e7053ac MP |
480 | if (verbose >= 2) { |
481 | rprintf(FINFO, | |
482 | disable_deltas_p() | |
483 | ? "delta-transmission disabled for local transfer or --whole-file\n" | |
484 | : "delta transmission enabled\n"); | |
485 | } | |
486 | ||
a57873b7 AT |
487 | /* we expect to just sit around now, so don't exit on a |
488 | timeout. If we really get a timeout then the other process should | |
489 | exit */ | |
490 | io_timeout = 0; | |
491 | ||
2f03f956 AT |
492 | for (i = 0; i < flist->count; i++) { |
493 | struct file_struct *file = flist->files[i]; | |
494 | mode_t saved_mode = file->mode; | |
495 | if (!file->basename) continue; | |
496 | ||
497 | /* we need to ensure that any directories we create have writeable | |
498 | permissions initially so that we can create the files within | |
499 | them. This is then fixed after the files are transferred */ | |
500 | if (!am_root && S_ISDIR(file->mode)) { | |
501 | file->mode |= S_IWUSR; /* user write */ | |
a1b1b1da MP |
502 | /* XXX: Could this be causing a problem on SCO? Perhaps their |
503 | * handling of permissions is strange? */ | |
2f03f956 AT |
504 | } |
505 | ||
506 | recv_generator(local_name?local_name:f_name(file), | |
507 | flist,i,f); | |
508 | ||
509 | file->mode = saved_mode; | |
510 | } | |
511 | ||
512 | phase++; | |
513 | csum_length = SUM_LENGTH; | |
514 | ignore_times=1; | |
515 | ||
516 | if (verbose > 2) | |
517 | rprintf(FINFO,"generate_files phase=%d\n",phase); | |
518 | ||
519 | write_int(f,-1); | |
520 | ||
2f03f956 AT |
521 | if (remote_version >= 13) { |
522 | /* in newer versions of the protocol the files can cycle through | |
523 | the system more than once to catch initial checksum errors */ | |
524 | for (i=read_int(f_recv); i != -1; i=read_int(f_recv)) { | |
525 | struct file_struct *file = flist->files[i]; | |
526 | recv_generator(local_name?local_name:f_name(file), | |
527 | flist,i,f); | |
528 | } | |
529 | ||
530 | phase++; | |
531 | if (verbose > 2) | |
532 | rprintf(FINFO,"generate_files phase=%d\n",phase); | |
533 | ||
534 | write_int(f,-1); | |
535 | } | |
536 | } |