Commit | Line | Data |
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ef1aa910 | 1 | /* -*- c-file-style: "linux" -*- |
91262d5d MP |
2 | |
3 | rsync -- fast file replication program | |
2cda2560 WD |
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> |
2cda2560 | 8 | |
2f03f956 AT |
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. | |
2cda2560 | 13 | |
2f03f956 AT |
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. | |
2cda2560 | 18 | |
2f03f956 AT |
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 | ||
2cda2560 | 63 | /* if always checksum is set then we use the checksum instead |
2f03f956 AT |
64 | of the file time to determine whether to sync */ |
65 | if (always_checksum && S_ISREG(st->st_mode)) { | |
66 | char sum[MD4_SUM_LENGTH]; | |
60c8d7bc DD |
67 | char fnamecmpdest[MAXPATHLEN]; |
68 | ||
69 | if (compare_dest != NULL) { | |
70 | if (access(fname, 0) != 0) { | |
8950ac03 | 71 | snprintf(fnamecmpdest,MAXPATHLEN,"%s/%s", |
2cda2560 | 72 | compare_dest,fname); |
60c8d7bc DD |
73 | fname = fnamecmpdest; |
74 | } | |
75 | } | |
2f03f956 | 76 | file_checksum(fname,sum,st->st_size); |
f855a7d0 AT |
77 | if (remote_version < 21) { |
78 | return (memcmp(sum,file->sum,2) == 0); | |
79 | } else { | |
80 | return (memcmp(sum,file->sum,MD4_SUM_LENGTH) == 0); | |
81 | } | |
2f03f956 AT |
82 | } |
83 | ||
f83f0548 AT |
84 | if (size_only) { |
85 | return 1; | |
86 | } | |
87 | ||
2f03f956 AT |
88 | if (ignore_times) { |
89 | return 0; | |
90 | } | |
91 | ||
5b56cc19 | 92 | return (cmp_modtime(st->st_mtime,file->modtime) == 0); |
2f03f956 AT |
93 | } |
94 | ||
95 | ||
96 | /* use a larger block size for really big files */ | |
97 | static int adapt_block_size(struct file_struct *file, int bsize) | |
98 | { | |
99 | int ret; | |
100 | ||
101 | if (bsize != BLOCK_SIZE) return bsize; | |
102 | ||
103 | ret = file->length / (10000); /* rough heuristic */ | |
104 | ret = ret & ~15; /* multiple of 16 */ | |
105 | if (ret < bsize) ret = bsize; | |
106 | if (ret > CHUNK_SIZE/2) ret = CHUNK_SIZE/2; | |
107 | return ret; | |
108 | } | |
109 | ||
110 | ||
111 | /* | |
80605142 | 112 | send a header that says "we have no checksums" down the f_out fd |
2f03f956 | 113 | */ |
80605142 | 114 | static void send_null_sums(int f_out) |
2f03f956 | 115 | { |
80605142 WD |
116 | write_int(f_out, 0); |
117 | write_int(f_out, block_size); | |
118 | write_int(f_out, 0); | |
2f03f956 AT |
119 | } |
120 | ||
bceec82f | 121 | |
80605142 | 122 | |
bceec82f MP |
123 | /** |
124 | * Perhaps we want to just send an empty checksum set for this file, | |
125 | * which will force the whole thing to be literally transferred. | |
126 | * | |
127 | * When do we do this? If the user's explicitly said they | |
128 | * want the whole thing, or if { they haven't explicitly | |
129 | * requested a delta, and it's local but not batch mode.} | |
130 | * | |
131 | * Whew. */ | |
132 | static BOOL disable_deltas_p(void) | |
133 | { | |
2cda2560 | 134 | extern int whole_file; |
bceec82f MP |
135 | extern int local_server; |
136 | extern int write_batch; | |
137 | ||
2cda2560 | 138 | if (whole_file > 0) |
bceec82f | 139 | return True; |
2cda2560 | 140 | if (whole_file == 0 || write_batch) |
bceec82f | 141 | return False; |
2cda2560 | 142 | return local_server; |
bceec82f MP |
143 | } |
144 | ||
145 | ||
80605142 WD |
146 | /* |
147 | * Generate and send a stream of signatures/checksums that describe a buffer | |
e66dfd18 | 148 | * |
80605142 WD |
149 | * Generate approximately one checksum every block_len bytes. |
150 | */ | |
151 | static void generate_and_send_sums(struct map_struct *buf, OFF_T len, | |
152 | int block_len, int f_out) | |
2f03f956 | 153 | { |
80605142 WD |
154 | size_t i; |
155 | struct sum_struct sum; | |
2f03f956 AT |
156 | OFF_T offset = 0; |
157 | ||
80605142 WD |
158 | sum.count = (len + (block_len - 1)) / block_len; |
159 | sum.remainder = (len % block_len); | |
160 | sum.n = block_len; | |
161 | sum.flength = len; | |
162 | /* not needed here sum.sums = NULL; */ | |
2f03f956 | 163 | |
80605142 | 164 | if (sum.count && verbose > 3) { |
67684d03 | 165 | rprintf(FINFO, "count=%ld rem=%ld n=%ld flength=%.0f\n", |
80605142 WD |
166 | (long) sum.count, (long) sum.remainder, |
167 | (long) sum.n, (double) sum.flength); | |
67684d03 | 168 | } |
e66dfd18 | 169 | |
80605142 WD |
170 | write_int(f_out, sum.count); |
171 | write_int(f_out, sum.n); | |
172 | write_int(f_out, sum.remainder); | |
2f03f956 | 173 | |
80605142 WD |
174 | for (i = 0; i < sum.count; i++) { |
175 | int n1 = MIN(len, block_len); | |
e66dfd18 | 176 | char *map = map_ptr(buf, offset, n1); |
80605142 WD |
177 | uint32 sum1 = get_checksum1(map, n1); |
178 | char sum2[SUM_LENGTH]; | |
2f03f956 | 179 | |
80605142 | 180 | get_checksum2(map, n1, sum2); |
2f03f956 | 181 | |
80605142 | 182 | if (verbose > 3) { |
e66dfd18 | 183 | rprintf(FINFO, |
80605142 WD |
184 | "chunk[%d] offset=%.0f len=%d sum1=%08lx\n", |
185 | i, (double) offset, n1, (unsigned long) sum1); | |
186 | } | |
187 | write_int(f_out, sum1); | |
188 | write_buf(f_out, sum2, csum_length); | |
2f03f956 AT |
189 | len -= n1; |
190 | offset += n1; | |
191 | } | |
2f03f956 AT |
192 | } |
193 | ||
194 | ||
ef1aa910 | 195 | |
420ef2c4 MP |
196 | /** |
197 | * Acts on file number @p i from @p flist, whose name is @p fname. | |
ef1aa910 MP |
198 | * |
199 | * First fixes up permissions, then generates checksums for the file. | |
200 | * | |
420ef2c4 MP |
201 | * @note This comment was added later by mbp who was trying to work it |
202 | * out. It might be wrong. | |
2cda2560 | 203 | **/ |
420ef2c4 | 204 | void recv_generator(char *fname, struct file_list *flist, int i, int f_out) |
2cda2560 | 205 | { |
2f03f956 AT |
206 | int fd; |
207 | STRUCT_STAT st; | |
208 | struct map_struct *buf; | |
2f03f956 AT |
209 | int statret; |
210 | struct file_struct *file = flist->files[i]; | |
375a4556 DD |
211 | char *fnamecmp; |
212 | char fnamecmpbuf[MAXPATHLEN]; | |
213 | extern char *compare_dest; | |
f7632fc6 | 214 | extern int list_only; |
4df9f368 | 215 | extern int preserve_perms; |
1347d512 | 216 | extern int only_existing; |
b35d0d8e | 217 | extern int orig_umask; |
f7632fc6 AT |
218 | |
219 | if (list_only) return; | |
2f03f956 AT |
220 | |
221 | if (verbose > 2) | |
222 | rprintf(FINFO,"recv_generator(%s,%d)\n",fname,i); | |
223 | ||
224 | statret = link_stat(fname,&st); | |
63787382 | 225 | |
1347d512 AT |
226 | if (only_existing && statret == -1 && errno == ENOENT) { |
227 | /* we only want to update existing files */ | |
1bbd10fe | 228 | if (verbose > 1) rprintf(FINFO, "not creating new file \"%s\"\n",fname); |
1347d512 AT |
229 | return; |
230 | } | |
231 | ||
2cda2560 WD |
232 | if (statret == 0 && |
233 | !preserve_perms && | |
4df9f368 AT |
234 | (S_ISDIR(st.st_mode) == S_ISDIR(file->mode))) { |
235 | /* if the file exists already and we aren't perserving | |
2cda2560 WD |
236 | * permissions then act as though the remote end sent |
237 | * us the file permissions we already have */ | |
7e0ca8e2 | 238 | file->mode = (file->mode & _S_IFMT) | (st.st_mode & ~_S_IFMT); |
4df9f368 AT |
239 | } |
240 | ||
2f03f956 | 241 | if (S_ISDIR(file->mode)) { |
2cda2560 WD |
242 | /* The file to be received is a directory, so we need |
243 | * to prepare appropriately. If there is already a | |
244 | * file of that name and it is *not* a directory, then | |
245 | * we need to delete it. If it doesn't exist, then | |
246 | * recursively create it. */ | |
247 | ||
85d4d142 | 248 | if (dry_run) return; /* XXXX -- might cause inaccuracies?? -- mbp */ |
2f03f956 | 249 | if (statret == 0 && !S_ISDIR(st.st_mode)) { |
c7c11a0d | 250 | if (robust_unlink(fname) != 0) { |
85d4d142 MP |
251 | rprintf(FERROR, RSYNC_NAME |
252 | ": recv_generator: unlink \"%s\" to make room for directory: %s\n", | |
2cda2560 | 253 | fname,strerror(errno)); |
2f03f956 AT |
254 | return; |
255 | } | |
256 | statret = -1; | |
257 | } | |
258 | if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) { | |
2cda2560 WD |
259 | if (!(relative_paths && errno==ENOENT && |
260 | create_directory_path(fname, orig_umask)==0 && | |
2f03f956 | 261 | do_mkdir(fname,file->mode)==0)) { |
85d4d142 | 262 | rprintf(FERROR, RSYNC_NAME ": recv_generator: mkdir \"%s\": %s (2)\n", |
2f03f956 AT |
263 | fname,strerror(errno)); |
264 | } | |
265 | } | |
2cda2560 | 266 | /* f_out is set to -1 when doing final directory |
de343e3c | 267 | permission and modification time repair */ |
2cda2560 | 268 | if (set_perms(fname,file,NULL,0) && verbose && (f_out != -1)) |
2f03f956 AT |
269 | rprintf(FINFO,"%s/\n",fname); |
270 | return; | |
271 | } | |
272 | ||
273 | if (preserve_links && S_ISLNK(file->mode)) { | |
274 | #if SUPPORT_LINKS | |
275 | char lnk[MAXPATHLEN]; | |
276 | int l; | |
277 | extern int safe_symlinks; | |
278 | ||
279 | if (safe_symlinks && unsafe_symlink(file->link, fname)) { | |
280 | if (verbose) { | |
1bbd10fe | 281 | rprintf(FINFO,"ignoring unsafe symlink \"%s\" -> \"%s\"\n", |
2f03f956 AT |
282 | fname,file->link); |
283 | } | |
284 | return; | |
285 | } | |
286 | if (statret == 0) { | |
287 | l = readlink(fname,lnk,MAXPATHLEN-1); | |
288 | if (l > 0) { | |
289 | lnk[l] = 0; | |
85d4d142 MP |
290 | /* A link already pointing to the |
291 | * right place -- no further action | |
292 | * required. */ | |
7e0ca8e2 | 293 | if (strcmp(lnk,file->link) == 0) { |
2f03f956 AT |
294 | set_perms(fname,file,&st,1); |
295 | return; | |
296 | } | |
2cda2560 | 297 | } |
85d4d142 MP |
298 | /* Not a symlink, so delete whatever's |
299 | * already there and put a new symlink | |
2cda2560 | 300 | * in place. */ |
4b3977bf | 301 | delete_file(fname); |
2f03f956 | 302 | } |
2f03f956 | 303 | if (do_symlink(file->link,fname) != 0) { |
85d4d142 | 304 | rprintf(FERROR,RSYNC_NAME": symlink \"%s\" -> \"%s\": %s\n", |
2f03f956 AT |
305 | fname,file->link,strerror(errno)); |
306 | } else { | |
307 | set_perms(fname,file,NULL,0); | |
308 | if (verbose) { | |
1bbd10fe | 309 | rprintf(FINFO,"%s -> %s\n", fname,file->link); |
2f03f956 AT |
310 | } |
311 | } | |
312 | #endif | |
313 | return; | |
314 | } | |
315 | ||
316 | #ifdef HAVE_MKNOD | |
317 | if (am_root && preserve_devices && IS_DEVICE(file->mode)) { | |
2cda2560 | 318 | if (statret != 0 || |
2f03f956 | 319 | st.st_mode != file->mode || |
2cda2560 | 320 | st.st_rdev != file->rdev) { |
2f03f956 AT |
321 | delete_file(fname); |
322 | if (verbose > 2) | |
323 | rprintf(FINFO,"mknod(%s,0%o,0x%x)\n", | |
324 | fname,(int)file->mode,(int)file->rdev); | |
325 | if (do_mknod(fname,file->mode,file->rdev) != 0) { | |
326 | rprintf(FERROR,"mknod %s : %s\n",fname,strerror(errno)); | |
327 | } else { | |
328 | set_perms(fname,file,NULL,0); | |
329 | if (verbose) | |
330 | rprintf(FINFO,"%s\n",fname); | |
331 | } | |
332 | } else { | |
333 | set_perms(fname,file,&st,1); | |
334 | } | |
335 | return; | |
336 | } | |
337 | #endif | |
338 | ||
339 | if (preserve_hard_links && check_hard_link(file)) { | |
340 | if (verbose > 1) | |
fba31efb | 341 | rprintf(FINFO, "recv_generator: \"%s\" is a hard link\n",f_name(file)); |
2f03f956 AT |
342 | return; |
343 | } | |
344 | ||
345 | if (!S_ISREG(file->mode)) { | |
1bbd10fe | 346 | rprintf(FINFO, "skipping non-regular file \"%s\"\n",fname); |
2f03f956 AT |
347 | return; |
348 | } | |
349 | ||
375a4556 DD |
350 | fnamecmp = fname; |
351 | ||
352 | if ((statret == -1) && (compare_dest != NULL)) { | |
353 | /* try the file at compare_dest instead */ | |
354 | int saveerrno = errno; | |
8950ac03 | 355 | snprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",compare_dest,fname); |
375a4556 DD |
356 | statret = link_stat(fnamecmpbuf,&st); |
357 | if (!S_ISREG(st.st_mode)) | |
358 | statret = -1; | |
359 | if (statret == -1) | |
360 | errno = saveerrno; | |
59c95e42 DD |
361 | #if HAVE_LINK |
362 | else if (link_dest && !dry_run) { | |
363 | if (do_link(fnamecmpbuf, fname) != 0) { | |
364 | if (verbose > 0) | |
365 | rprintf(FINFO,"link %s => %s : %s\n", | |
366 | fnamecmpbuf, | |
367 | fname, | |
368 | strerror(errno)); | |
369 | } | |
370 | fnamecmp = fnamecmpbuf; | |
371 | } | |
372 | #endif | |
375a4556 DD |
373 | else |
374 | fnamecmp = fnamecmpbuf; | |
375 | } | |
376 | ||
2f03f956 AT |
377 | if (statret == -1) { |
378 | if (errno == ENOENT) { | |
379 | write_int(f_out,i); | |
80605142 | 380 | if (!dry_run) send_null_sums(f_out); |
2f03f956 AT |
381 | } else { |
382 | if (verbose > 1) | |
fb47591d MP |
383 | rprintf(FERROR, RSYNC_NAME |
384 | ": recv_generator failed to open \"%s\": %s\n", | |
385 | fname, strerror(errno)); | |
2f03f956 AT |
386 | } |
387 | return; | |
388 | } | |
389 | ||
390 | if (!S_ISREG(st.st_mode)) { | |
391 | if (delete_file(fname) != 0) { | |
392 | return; | |
393 | } | |
394 | ||
395 | /* now pretend the file didn't exist */ | |
396 | write_int(f_out,i); | |
80605142 | 397 | if (!dry_run) send_null_sums(f_out); |
2f03f956 AT |
398 | return; |
399 | } | |
400 | ||
2cda2560 | 401 | if (opt_ignore_existing && fnamecmp == fname) { |
3d6feada MP |
402 | if (verbose > 1) |
403 | rprintf(FINFO,"%s exists\n",fname); | |
404 | return; | |
2cda2560 | 405 | } |
3d6feada | 406 | |
5b56cc19 | 407 | if (update_only && cmp_modtime(st.st_mtime,file->modtime)>0 && fnamecmp == fname) { |
2f03f956 AT |
408 | if (verbose > 1) |
409 | rprintf(FINFO,"%s is newer\n",fname); | |
410 | return; | |
411 | } | |
412 | ||
413 | if (skip_file(fname, file, &st)) { | |
bd4ed7f7 DD |
414 | if (fnamecmp == fname) |
415 | set_perms(fname,file,&st,1); | |
2f03f956 AT |
416 | return; |
417 | } | |
418 | ||
419 | if (dry_run) { | |
420 | write_int(f_out,i); | |
421 | return; | |
422 | } | |
423 | ||
bceec82f | 424 | if (disable_deltas_p()) { |
2f03f956 | 425 | write_int(f_out,i); |
80605142 | 426 | send_null_sums(f_out); |
2f03f956 AT |
427 | return; |
428 | } | |
429 | ||
2cda2560 | 430 | /* open the file */ |
8c9fd200 | 431 | fd = do_open(fnamecmp, O_RDONLY, 0); |
2f03f956 AT |
432 | |
433 | if (fd == -1) { | |
85d4d142 | 434 | rprintf(FERROR,RSYNC_NAME": failed to open \"%s\", continuing : %s\n",fnamecmp,strerror(errno)); |
60be6acf DD |
435 | /* pretend the file didn't exist */ |
436 | write_int(f_out,i); | |
80605142 | 437 | send_null_sums(f_out); |
2f03f956 AT |
438 | return; |
439 | } | |
440 | ||
441 | if (st.st_size > 0) { | |
442 | buf = map_file(fd,st.st_size); | |
443 | } else { | |
444 | buf = NULL; | |
445 | } | |
446 | ||
447 | if (verbose > 3) | |
5f808dfb | 448 | rprintf(FINFO,"gen mapped %s of size %.0f\n",fnamecmp,(double)st.st_size); |
2f03f956 | 449 | |
2f03f956 | 450 | if (verbose > 2) |
80605142 | 451 | rprintf(FINFO, "generating and sending sums for %d\n", i); |
2f03f956 AT |
452 | |
453 | write_int(f_out,i); | |
80605142 WD |
454 | generate_and_send_sums(buf, st.st_size, |
455 | adapt_block_size(file, block_size), f_out); | |
2f03f956 AT |
456 | |
457 | close(fd); | |
458 | if (buf) unmap_file(buf); | |
2f03f956 AT |
459 | } |
460 | ||
461 | ||
462 | ||
463 | void generate_files(int f,struct file_list *flist,char *local_name,int f_recv) | |
464 | { | |
465 | int i; | |
466 | int phase=0; | |
467 | ||
468 | if (verbose > 2) | |
469 | rprintf(FINFO,"generator starting pid=%d count=%d\n", | |
470 | (int)getpid(),flist->count); | |
471 | ||
3e7053ac MP |
472 | if (verbose >= 2) { |
473 | rprintf(FINFO, | |
2cda2560 | 474 | disable_deltas_p() |
3e7053ac MP |
475 | ? "delta-transmission disabled for local transfer or --whole-file\n" |
476 | : "delta transmission enabled\n"); | |
477 | } | |
2cda2560 | 478 | |
a57873b7 AT |
479 | /* we expect to just sit around now, so don't exit on a |
480 | timeout. If we really get a timeout then the other process should | |
481 | exit */ | |
482 | io_timeout = 0; | |
483 | ||
2f03f956 AT |
484 | for (i = 0; i < flist->count; i++) { |
485 | struct file_struct *file = flist->files[i]; | |
486 | mode_t saved_mode = file->mode; | |
487 | if (!file->basename) continue; | |
488 | ||
489 | /* we need to ensure that any directories we create have writeable | |
490 | permissions initially so that we can create the files within | |
491 | them. This is then fixed after the files are transferred */ | |
492 | if (!am_root && S_ISDIR(file->mode)) { | |
493 | file->mode |= S_IWUSR; /* user write */ | |
2cda2560 WD |
494 | /* XXX: Could this be causing a problem on SCO? Perhaps their |
495 | * handling of permissions is strange? */ | |
2f03f956 AT |
496 | } |
497 | ||
2cda2560 | 498 | recv_generator(local_name?local_name:f_name(file), flist,i,f); |
2f03f956 AT |
499 | |
500 | file->mode = saved_mode; | |
501 | } | |
502 | ||
503 | phase++; | |
504 | csum_length = SUM_LENGTH; | |
505 | ignore_times=1; | |
506 | ||
507 | if (verbose > 2) | |
508 | rprintf(FINFO,"generate_files phase=%d\n",phase); | |
509 | ||
510 | write_int(f,-1); | |
511 | ||
2f03f956 AT |
512 | if (remote_version >= 13) { |
513 | /* in newer versions of the protocol the files can cycle through | |
514 | the system more than once to catch initial checksum errors */ | |
515 | for (i=read_int(f_recv); i != -1; i=read_int(f_recv)) { | |
516 | struct file_struct *file = flist->files[i]; | |
517 | recv_generator(local_name?local_name:f_name(file), | |
2cda2560 | 518 | flist,i,f); |
2f03f956 AT |
519 | } |
520 | ||
521 | phase++; | |
522 | if (verbose > 2) | |
523 | rprintf(FINFO,"generate_files phase=%d\n",phase); | |
524 | ||
525 | write_int(f,-1); | |
526 | } | |
527 | } |