1 /* -*- c-file-style: "linux" -*-
3 rsync -- fast file replication program
5 Copyright (C) 1996-2000 by Andrew Tridgell
6 Copyright (C) Paul Mackerras 1996
7 Copyright (C) 2002 by Martin Pool <mbp@samba.org>
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.
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.
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.
28 extern int relative_paths;
29 extern int preserve_links;
31 extern int preserve_devices;
32 extern int preserve_hard_links;
33 extern int preserve_perms;
34 extern int preserve_uid;
35 extern int preserve_gid;
36 extern int update_only;
37 extern int opt_ignore_existing;
38 extern int csum_length;
39 extern int ignore_times;
41 extern int io_timeout;
42 extern int protocol_version;
43 extern int always_checksum;
44 extern char *compare_dest;
46 extern struct file_struct **hlink_list;
49 /* choose whether to skip a particular file */
50 static int skip_file(char *fname, struct file_struct *file, STRUCT_STAT *st)
52 if (st->st_size != file->length) {
57 && (st->st_mode & ~_S_IFMT) != (file->mode & ~_S_IFMT))
60 if (am_root && preserve_uid && st->st_uid != file->uid)
63 if (preserve_gid && file->gid != GID_NONE
64 && st->st_gid != file->gid)
68 /* if always checksum is set then we use the checksum instead
69 of the file time to determine whether to sync */
70 if (always_checksum && S_ISREG(st->st_mode)) {
71 char sum[MD4_SUM_LENGTH];
72 char fnamecmpdest[MAXPATHLEN];
74 if (compare_dest != NULL) {
75 if (access(fname, 0) != 0) {
76 pathjoin(fnamecmpdest, sizeof fnamecmpdest,
81 file_checksum(fname,sum,st->st_size);
82 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
83 : MD4_SUM_LENGTH) == 0;
94 return (cmp_modtime(st->st_mtime,file->modtime) == 0);
99 * NULL sum_struct means we have no checksums
101 void write_sum_head(int f, struct sum_struct *sum)
103 static struct sum_struct null_sum;
105 if (sum == (struct sum_struct *)NULL)
108 write_int(f, sum->count);
109 write_int(f, sum->blength);
110 if (protocol_version >= 27)
111 write_int(f, sum->s2length);
112 write_int(f, sum->remainder);
116 * set (initialize) the size entries in the per-file sum_struct
117 * calulating dynamic block ans checksum sizes.
119 * This is only called from generate_and_send_sums() but is a seperate
120 * function to encapsulate the logic.
122 * The block size is a rounded square root of file length.
124 * The checksum size is determined according to:
125 * blocksum_bits = BLOCKSUM_EXP + 2*log2(file_len) - log2(block_len)
126 * provided by Donovan Baarda which gives a probability of rsync
127 * algorithm corrupting data and falling back using the whole md4
130 * This might be made one of several selectable heuristics.
133 static void sum_sizes_sqroot(struct sum_struct *sum, uint64 len)
135 extern unsigned int block_size;
136 unsigned int blength;
142 blength = block_size;
143 } else if (len <= BLOCK_SIZE * BLOCK_SIZE) {
144 blength = BLOCK_SIZE;
154 if (len < (uint64)blength * blength)
157 } while (c >= 8); /* round to multiple of 8 */
158 blength = MAX(blength, BLOCK_SIZE);
161 if (protocol_version < 27) {
162 s2length = csum_length;
163 } else if (csum_length == SUM_LENGTH) {
164 s2length = SUM_LENGTH;
166 int b = BLOCKSUM_BIAS;
172 while (c >>= 1 && b) {
175 s2length = (b + 1 - 32 + 7) / 8; /* add a bit,
178 * --optimize in compiler--
180 s2length = MAX(s2length, csum_length);
181 s2length = MIN(s2length, SUM_LENGTH);
185 sum->blength = blength;
186 sum->s2length = s2length;
187 sum->count = (len + (blength - 1)) / blength;
188 sum->remainder = (len % blength);
190 if (sum->count && verbose > 2) {
191 rprintf(FINFO, "count=%.0f rem=%u blength=%u s2length=%d flength=%.0f\n",
192 (double)sum->count, sum->remainder, sum->blength,
193 sum->s2length, (double)sum->flength);
198 * Perhaps we want to just send an empty checksum set for this file,
199 * which will force the whole thing to be literally transferred.
201 * When do we do this? If the user's explicitly said they
202 * want the whole thing, or if { they haven't explicitly
203 * requested a delta, and it's local but not batch mode.}
206 static BOOL disable_deltas_p(void)
208 extern int whole_file;
209 extern int local_server;
210 extern int write_batch;
214 if (whole_file == 0 || write_batch)
221 * Generate and send a stream of signatures/checksums that describe a buffer
223 * Generate approximately one checksum every block_len bytes.
225 static void generate_and_send_sums(struct map_struct *buf, size_t len, int f_out)
228 struct sum_struct sum;
231 sum_sizes_sqroot(&sum, len);
233 write_sum_head(f_out, &sum);
235 for (i = 0; i < sum.count; i++) {
236 unsigned int n1 = MIN(len, sum.blength);
237 char *map = map_ptr(buf, offset, n1);
238 uint32 sum1 = get_checksum1(map, n1);
239 char sum2[SUM_LENGTH];
241 get_checksum2(map, n1, sum2);
245 "chunk[%.0f] offset=%.0f len=%u sum1=%08lx\n",
246 (double)i, (double)offset, n1,
247 (unsigned long)sum1);
249 write_int(f_out, sum1);
250 write_buf(f_out, sum2, sum.s2length);
259 * Acts on file number @p i from @p flist, whose name is @p fname.
261 * First fixes up permissions, then generates checksums for the file.
263 * @note This comment was added later by mbp who was trying to work it
264 * out. It might be wrong.
266 void recv_generator(char *fname, struct file_struct *file, int i, int f_out)
270 struct map_struct *mapbuf;
273 char fnamecmpbuf[MAXPATHLEN];
274 extern char *compare_dest;
275 extern int list_only;
276 extern int only_existing;
277 extern int orig_umask;
283 rprintf(FINFO,"recv_generator(%s,%d)\n",fname,i);
285 statret = link_stat(fname,&st);
287 if (only_existing && statret == -1 && errno == ENOENT) {
288 /* we only want to update existing files */
289 if (verbose > 1) rprintf(FINFO, "not creating new file \"%s\"\n",fname);
295 (S_ISDIR(st.st_mode) == S_ISDIR(file->mode))) {
296 /* if the file exists already and we aren't perserving
297 * permissions then act as though the remote end sent
298 * us the file permissions we already have */
299 file->mode = (file->mode & _S_IFMT) | (st.st_mode & ~_S_IFMT);
302 if (S_ISDIR(file->mode)) {
303 /* The file to be received is a directory, so we need
304 * to prepare appropriately. If there is already a
305 * file of that name and it is *not* a directory, then
306 * we need to delete it. If it doesn't exist, then
307 * recursively create it. */
309 if (dry_run) return; /* XXXX -- might cause inaccuracies?? -- mbp */
310 if (statret == 0 && !S_ISDIR(st.st_mode)) {
311 if (robust_unlink(fname) != 0) {
313 "recv_generator: unlink %s to make room for directory: %s\n",
314 full_fname(fname), strerror(errno));
319 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
320 if (!(relative_paths && errno==ENOENT &&
321 create_directory_path(fname, orig_umask)==0 &&
322 do_mkdir(fname,file->mode)==0)) {
323 rprintf(FERROR, "recv_generator: mkdir %s failed: %s\n",
324 full_fname(fname), strerror(errno));
327 /* f_out is set to -1 when doing final directory
328 permission and modification time repair */
329 if (set_perms(fname,file,NULL,0) && verbose && (f_out != -1))
330 rprintf(FINFO,"%s/\n",fname);
334 if (preserve_links && S_ISLNK(file->mode)) {
336 char lnk[MAXPATHLEN];
338 extern int safe_symlinks;
340 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
342 rprintf(FINFO, "ignoring unsafe symlink %s -> \"%s\"\n",
343 full_fname(fname), file->u.link);
348 l = readlink(fname,lnk,MAXPATHLEN-1);
351 /* A link already pointing to the
352 * right place -- no further action
354 if (strcmp(lnk,file->u.link) == 0) {
355 set_perms(fname,file,&st,1);
359 /* Not a symlink, so delete whatever's
360 * already there and put a new symlink
364 if (do_symlink(file->u.link,fname) != 0) {
365 rprintf(FERROR, "symlink %s -> \"%s\" failed: %s\n",
366 full_fname(fname), file->u.link, strerror(errno));
368 set_perms(fname,file,NULL,0);
370 rprintf(FINFO,"%s -> %s\n", fname,file->u.link);
378 if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
380 st.st_mode != file->mode ||
381 (DEV64_T)st.st_rdev != file->u.rdev) {
384 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
385 fname,(int)file->mode,(int)file->u.rdev);
386 if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
387 rprintf(FERROR, "mknod %s failed: %s\n",
388 full_fname(fname), strerror(errno));
390 set_perms(fname,file,NULL,0);
392 rprintf(FINFO,"%s\n",fname);
395 set_perms(fname,file,&st,1);
401 if (preserve_hard_links && hard_link_check(file, HL_CHECK_MASTER))
404 if (!S_ISREG(file->mode)) {
405 rprintf(FINFO, "skipping non-regular file \"%s\"\n",fname);
411 if ((statret == -1) && (compare_dest != NULL)) {
412 /* try the file at compare_dest instead */
413 int saveerrno = errno;
414 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf, compare_dest, fname);
415 statret = link_stat(fnamecmpbuf,&st);
416 if (!S_ISREG(st.st_mode))
421 else if (link_dest && !dry_run) {
422 if (do_link(fnamecmpbuf, fname) != 0) {
424 rprintf(FINFO,"link %s => %s : %s\n",
429 fnamecmp = fnamecmpbuf;
433 fnamecmp = fnamecmpbuf;
437 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
439 if (errno == ENOENT) {
441 if (!dry_run) write_sum_head(f_out, NULL);
442 } else if (verbose > 1) {
444 "recv_generator: failed to open %s: %s\n",
445 full_fname(fname), strerror(errno));
450 if (!S_ISREG(st.st_mode)) {
451 if (delete_file(fname) != 0) {
455 /* now pretend the file didn't exist */
456 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
459 if (!dry_run) write_sum_head(f_out, NULL);
463 if (opt_ignore_existing && fnamecmp == fname) {
465 rprintf(FINFO,"%s exists\n",fname);
469 if (update_only && cmp_modtime(st.st_mtime,file->modtime)>0 && fnamecmp == fname) {
471 rprintf(FINFO,"%s is newer\n",fname);
475 if (skip_file(fname, file, &st)) {
476 if (fnamecmp == fname)
477 set_perms(fname,file,&st,1);
486 if (disable_deltas_p()) {
488 write_sum_head(f_out, NULL);
493 fd = do_open(fnamecmp, O_RDONLY, 0);
496 rprintf(FERROR, "failed to open %s, continuing: %s\n",
497 full_fname(fnamecmp), strerror(errno));
498 /* pretend the file didn't exist */
499 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
502 write_sum_head(f_out, NULL);
507 mapbuf = map_file(fd,st.st_size);
512 rprintf(FINFO,"gen mapped %s of size %.0f\n", fnamecmp,
517 rprintf(FINFO, "generating and sending sums for %d\n", i);
520 generate_and_send_sums(mapbuf, st.st_size, f_out);
523 if (mapbuf) unmap_file(mapbuf);
527 void generate_files(int f, struct file_list *flist, char *local_name)
531 char fbuf[MAXPATHLEN];
534 rprintf(FINFO,"generator starting pid=%d count=%d\n",
535 (int)getpid(),flist->count);
540 ? "delta-transmission disabled for local transfer or --whole-file\n"
541 : "delta transmission enabled\n");
544 /* we expect to just sit around now, so don't exit on a
545 timeout. If we really get a timeout then the other process should
549 for (i = 0; i < flist->count; i++) {
550 struct file_struct *file = flist->files[i];
551 struct file_struct copy;
555 /* we need to ensure that any directories we create have writeable
556 permissions initially so that we can create the files within
557 them. This is then fixed after the files are transferred */
558 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
560 /* XXX: Could this be causing a problem on SCO? Perhaps their
561 * handling of permissions is strange? */
562 copy.mode |= S_IWUSR; /* user write */
566 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
571 csum_length = SUM_LENGTH;
575 rprintf(FINFO,"generate_files phase=%d\n",phase);
579 /* files can cycle through the system more than once
580 * to catch initial checksum errors */
581 while ((i = get_redo_num()) != -1) {
582 struct file_struct *file = flist->files[i];
583 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
589 rprintf(FINFO,"generate_files phase=%d\n",phase);
593 if (preserve_hard_links)
596 /* now we need to fix any directory permissions that were
597 * modified during the transfer */
598 for (i = 0; i < flist->count; i++) {
599 struct file_struct *file = flist->files[i];
600 if (!file->basename || !S_ISDIR(file->mode)) continue;
601 recv_generator(local_name ? local_name : f_name(file),
606 rprintf(FINFO,"generate_files finished\n");