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;
48 /* choose whether to skip a particular file */
49 static int skip_file(char *fname, struct file_struct *file, STRUCT_STAT *st)
51 if (st->st_size != file->length) {
56 && (st->st_mode & ~_S_IFMT) != (file->mode & ~_S_IFMT))
59 if (am_root && preserve_uid && st->st_uid != file->uid)
62 if (preserve_gid && file->gid != GID_NONE
63 && st->st_gid != file->gid)
67 /* if always checksum is set then we use the checksum instead
68 of the file time to determine whether to sync */
69 if (always_checksum && S_ISREG(st->st_mode)) {
70 char sum[MD4_SUM_LENGTH];
71 char fnamecmpdest[MAXPATHLEN];
73 if (compare_dest != NULL) {
74 if (access(fname, 0) != 0) {
75 pathjoin(fnamecmpdest, sizeof fnamecmpdest,
80 file_checksum(fname,sum,st->st_size);
81 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
82 : MD4_SUM_LENGTH) == 0;
93 return (cmp_modtime(st->st_mtime,file->modtime) == 0);
98 * NULL sum_struct means we have no checksums
100 void write_sum_head(int f, struct sum_struct *sum)
102 static struct sum_struct null_sum;
107 write_int(f, sum->count);
108 write_int(f, sum->blength);
109 if (protocol_version >= 27)
110 write_int(f, sum->s2length);
111 write_int(f, sum->remainder);
115 * set (initialize) the size entries in the per-file sum_struct
116 * calulating dynamic block ans checksum sizes.
118 * This is only called from generate_and_send_sums() but is a seperate
119 * function to encapsulate the logic.
121 * The block size is a rounded square root of file length.
123 * The checksum size is determined according to:
124 * blocksum_bits = BLOCKSUM_EXP + 2*log2(file_len) - log2(block_len)
125 * provided by Donovan Baarda which gives a probability of rsync
126 * algorithm corrupting data and falling back using the whole md4
129 * This might be made one of several selectable heuristics.
132 static void sum_sizes_sqroot(struct sum_struct *sum, uint64 len)
134 extern unsigned int block_size;
135 unsigned int blength;
141 blength = block_size;
142 } else if (len <= BLOCK_SIZE * BLOCK_SIZE) {
143 blength = BLOCK_SIZE;
153 if (len < (uint64)blength * blength)
156 } while (c >= 8); /* round to multiple of 8 */
157 blength = MAX(blength, BLOCK_SIZE);
160 if (protocol_version < 27) {
161 s2length = csum_length;
162 } else if (csum_length == SUM_LENGTH) {
163 s2length = SUM_LENGTH;
165 int b = BLOCKSUM_BIAS;
171 while (c >>= 1 && b) {
174 s2length = (b + 1 - 32 + 7) / 8; /* add a bit,
177 * --optimize in compiler--
179 s2length = MAX(s2length, csum_length);
180 s2length = MIN(s2length, SUM_LENGTH);
184 sum->blength = blength;
185 sum->s2length = s2length;
186 sum->count = (len + (blength - 1)) / blength;
187 sum->remainder = (len % blength);
189 if (sum->count && verbose > 2) {
190 rprintf(FINFO, "count=%.0f rem=%u blength=%u s2length=%d flength=%.0f\n",
191 (double)sum->count, sum->remainder, sum->blength,
192 sum->s2length, (double)sum->flength);
197 * Perhaps we want to just send an empty checksum set for this file,
198 * which will force the whole thing to be literally transferred.
200 * When do we do this? If the user's explicitly said they
201 * want the whole thing, or if { they haven't explicitly
202 * requested a delta, and it's local but not batch mode.}
205 static BOOL disable_deltas_p(void)
207 extern int whole_file;
208 extern int local_server;
209 extern int write_batch;
213 if (whole_file == 0 || write_batch)
220 * Generate and send a stream of signatures/checksums that describe a buffer
222 * Generate approximately one checksum every block_len bytes.
224 static void generate_and_send_sums(struct map_struct *buf, size_t len, int f_out)
227 struct sum_struct sum;
230 sum_sizes_sqroot(&sum, len);
232 write_sum_head(f_out, &sum);
234 for (i = 0; i < sum.count; i++) {
235 unsigned int n1 = MIN(len, sum.blength);
236 char *map = map_ptr(buf, offset, n1);
237 uint32 sum1 = get_checksum1(map, n1);
238 char sum2[SUM_LENGTH];
240 get_checksum2(map, n1, sum2);
244 "chunk[%.0f] offset=%.0f len=%u sum1=%08lx\n",
245 (double)i, (double)offset, n1,
246 (unsigned long)sum1);
248 write_int(f_out, sum1);
249 write_buf(f_out, sum2, sum.s2length);
258 * Acts on file number @p i from @p flist, whose name is @p fname.
260 * First fixes up permissions, then generates checksums for the file.
262 * @note This comment was added later by mbp who was trying to work it
263 * out. It might be wrong.
265 void recv_generator(char *fname, struct file_struct *file, int i, int f_out)
269 struct map_struct *mapbuf;
272 char fnamecmpbuf[MAXPATHLEN];
273 extern char *compare_dest;
274 extern int list_only;
275 extern int only_existing;
276 extern int orig_umask;
282 rprintf(FINFO,"recv_generator(%s,%d)\n",fname,i);
284 statret = link_stat(fname,&st);
286 if (only_existing && statret == -1 && errno == ENOENT) {
287 /* we only want to update existing files */
288 if (verbose > 1) rprintf(FINFO, "not creating new file \"%s\"\n",fname);
294 (S_ISDIR(st.st_mode) == S_ISDIR(file->mode))) {
295 /* if the file exists already and we aren't perserving
296 * permissions then act as though the remote end sent
297 * us the file permissions we already have */
298 file->mode = (file->mode & _S_IFMT) | (st.st_mode & ~_S_IFMT);
301 if (S_ISDIR(file->mode)) {
302 /* The file to be received is a directory, so we need
303 * to prepare appropriately. If there is already a
304 * file of that name and it is *not* a directory, then
305 * we need to delete it. If it doesn't exist, then
306 * recursively create it. */
308 if (dry_run) return; /* XXXX -- might cause inaccuracies?? -- mbp */
309 if (statret == 0 && !S_ISDIR(st.st_mode)) {
310 if (robust_unlink(fname) != 0) {
312 "recv_generator: unlink %s to make room for directory: %s\n",
313 full_fname(fname), strerror(errno));
318 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
319 if (!(relative_paths && errno==ENOENT &&
320 create_directory_path(fname, orig_umask)==0 &&
321 do_mkdir(fname,file->mode)==0)) {
322 rprintf(FERROR, "recv_generator: mkdir %s failed: %s\n",
323 full_fname(fname), strerror(errno));
326 /* f_out is set to -1 when doing final directory
327 permission and modification time repair */
328 if (set_perms(fname,file,NULL,0) && verbose && (f_out != -1))
329 rprintf(FINFO,"%s/\n",fname);
333 if (preserve_links && S_ISLNK(file->mode)) {
335 char lnk[MAXPATHLEN];
337 extern int safe_symlinks;
339 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
341 rprintf(FINFO, "ignoring unsafe symlink %s -> \"%s\"\n",
342 full_fname(fname), file->u.link);
347 l = readlink(fname,lnk,MAXPATHLEN-1);
350 /* A link already pointing to the
351 * right place -- no further action
353 if (strcmp(lnk,file->u.link) == 0) {
354 set_perms(fname,file,&st,1);
358 /* Not a symlink, so delete whatever's
359 * already there and put a new symlink
363 if (do_symlink(file->u.link,fname) != 0) {
364 rprintf(FERROR, "symlink %s -> \"%s\" failed: %s\n",
365 full_fname(fname), file->u.link, strerror(errno));
367 set_perms(fname,file,NULL,0);
369 rprintf(FINFO,"%s -> %s\n", fname,file->u.link);
377 if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
379 st.st_mode != file->mode ||
380 (DEV64_T)st.st_rdev != file->u.rdev) {
383 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
384 fname,(int)file->mode,(int)file->u.rdev);
385 if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
386 rprintf(FERROR, "mknod %s failed: %s\n",
387 full_fname(fname), strerror(errno));
389 set_perms(fname,file,NULL,0);
391 rprintf(FINFO,"%s\n",fname);
394 set_perms(fname,file,&st,1);
400 if (preserve_hard_links && hard_link_check(file, HL_CHECK_MASTER))
403 if (!S_ISREG(file->mode)) {
404 rprintf(FINFO, "skipping non-regular file \"%s\"\n",fname);
410 if (statret == -1 && compare_dest != NULL) {
411 /* try the file at compare_dest instead */
412 int saveerrno = errno;
413 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf, compare_dest, fname);
414 statret = link_stat(fnamecmpbuf,&st);
415 if (!S_ISREG(st.st_mode))
420 else if (link_dest && !dry_run) {
421 if (do_link(fnamecmpbuf, fname) != 0) {
423 rprintf(FINFO,"link %s => %s : %s\n",
428 fnamecmp = fnamecmpbuf;
432 fnamecmp = fnamecmpbuf;
436 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
438 if (errno == ENOENT) {
440 if (!dry_run) write_sum_head(f_out, NULL);
441 } else if (verbose > 1) {
443 "recv_generator: failed to open %s: %s\n",
444 full_fname(fname), strerror(errno));
449 if (!S_ISREG(st.st_mode)) {
450 if (delete_file(fname) != 0) {
454 /* now pretend the file didn't exist */
455 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
458 if (!dry_run) write_sum_head(f_out, NULL);
462 if (opt_ignore_existing && fnamecmp == fname) {
464 rprintf(FINFO,"%s exists\n",fname);
468 if (update_only && cmp_modtime(st.st_mtime,file->modtime)>0 && fnamecmp == fname) {
470 rprintf(FINFO,"%s is newer\n",fname);
474 if (skip_file(fname, file, &st)) {
475 if (fnamecmp == fname)
476 set_perms(fname,file,&st,1);
485 if (disable_deltas_p()) {
487 write_sum_head(f_out, NULL);
492 fd = do_open(fnamecmp, O_RDONLY, 0);
495 rprintf(FERROR, "failed to open %s, continuing: %s\n",
496 full_fname(fnamecmp), strerror(errno));
497 /* pretend the file didn't exist */
498 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
501 write_sum_head(f_out, NULL);
506 mapbuf = map_file(fd,st.st_size);
511 rprintf(FINFO,"gen mapped %s of size %.0f\n", fnamecmp,
516 rprintf(FINFO, "generating and sending sums for %d\n", i);
519 generate_and_send_sums(mapbuf, st.st_size, f_out);
522 if (mapbuf) unmap_file(mapbuf);
526 void generate_files(int f, struct file_list *flist, char *local_name)
530 char fbuf[MAXPATHLEN];
533 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
534 (long)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");