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