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,
50 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 snprintf(fnamecmpdest,MAXPATHLEN,"%s/%s",
81 file_checksum(fname,sum,st->st_size);
82 if (protocol_version < 21) {
83 return (memcmp(sum,file->sum,2) == 0);
85 return (memcmp(sum,file->sum,MD4_SUM_LENGTH) == 0);
97 return (cmp_modtime(st->st_mtime,file->modtime) == 0);
102 * NULL sum_struct means we have no checksums
104 void write_sum_head(int f, struct sum_struct *sum)
106 static struct sum_struct null_sum;
108 if (sum == (struct sum_struct *)NULL)
111 write_int(f, sum->count);
112 write_int(f, sum->blength);
113 if (protocol_version >= 27)
114 write_int(f, sum->s2length);
115 write_int(f, sum->remainder);
119 * set (initialize) the size entries in the per-file sum_struct
120 * calulating dynamic block ans checksum sizes.
122 * This is only called from generate_and_send_sums() but is a seperate
123 * function to encapsulate the logic.
125 * The block size is a rounded square root of file length.
127 * The checksum size is determined according to:
128 * blocksum_bits = BLOCKSUM_EXP + 2*log2(file_len) - log2(block_len)
129 * provided by Donovan Baarda which gives a probability of rsync
130 * algorithm corrupting data and falling back using the whole md4
133 * This might be made one of several selectable heuristics.
136 static void sum_sizes_sqroot(struct sum_struct *sum, uint64 len)
138 extern unsigned int block_size;
139 unsigned int blength;
145 blength = block_size;
146 } else if (len <= BLOCK_SIZE * BLOCK_SIZE) {
147 blength = BLOCK_SIZE;
157 if (len < (uint64)blength * blength)
160 } while (c >= 8); /* round to multiple of 8 */
161 blength = MAX(blength, BLOCK_SIZE);
164 if (protocol_version < 27) {
165 s2length = csum_length;
166 } else if (csum_length == SUM_LENGTH) {
167 s2length = SUM_LENGTH;
169 int b = BLOCKSUM_BIAS;
175 while (c >>= 1 && b) {
178 s2length = (b + 1 - 32 + 7) / 8; /* add a bit,
181 * --optimize in compiler--
183 s2length = MAX(s2length, csum_length);
184 s2length = MIN(s2length, SUM_LENGTH);
188 sum->blength = blength;
189 sum->s2length = s2length;
190 sum->count = (len + (blength - 1)) / blength;
191 sum->remainder = (len % blength);
193 if (sum->count && verbose > 2) {
194 rprintf(FINFO, "count=%.0f rem=%u blength=%u s2length=%d flength=%.0f\n",
195 (double)sum->count, sum->remainder, sum->blength,
196 sum->s2length, (double)sum->flength);
201 * Perhaps we want to just send an empty checksum set for this file,
202 * which will force the whole thing to be literally transferred.
204 * When do we do this? If the user's explicitly said they
205 * want the whole thing, or if { they haven't explicitly
206 * requested a delta, and it's local but not batch mode.}
209 static BOOL disable_deltas_p(void)
211 extern int whole_file;
212 extern int local_server;
213 extern int write_batch;
217 if (whole_file == 0 || write_batch)
224 * Generate and send a stream of signatures/checksums that describe a buffer
226 * Generate approximately one checksum every block_len bytes.
228 static void generate_and_send_sums(struct map_struct *buf, size_t len, int f_out)
231 struct sum_struct sum;
234 sum_sizes_sqroot(&sum, len);
236 write_sum_head(f_out, &sum);
238 for (i = 0; i < sum.count; i++) {
239 unsigned int n1 = MIN(len, sum.blength);
240 char *map = map_ptr(buf, offset, n1);
241 uint32 sum1 = get_checksum1(map, n1);
242 char sum2[SUM_LENGTH];
244 get_checksum2(map, n1, sum2);
248 "chunk[%.0f] offset=%.0f len=%u sum1=%08lx\n",
249 (double)i, (double)offset, n1,
250 (unsigned long)sum1);
252 write_int(f_out, sum1);
253 write_buf(f_out, sum2, sum.s2length);
262 * Acts on file number @p i from @p flist, whose name is @p fname.
264 * First fixes up permissions, then generates checksums for the file.
266 * @note This comment was added later by mbp who was trying to work it
267 * out. It might be wrong.
269 void recv_generator(char *fname, struct file_list *flist, int i, int f_out)
273 struct map_struct *mapbuf;
275 struct file_struct *file = flist->files[i];
277 char fnamecmpbuf[MAXPATHLEN];
278 extern char *compare_dest;
279 extern int list_only;
280 extern int only_existing;
281 extern int orig_umask;
283 if (list_only) return;
286 rprintf(FINFO,"recv_generator(%s,%d)\n",fname,i);
288 statret = link_stat(fname,&st);
290 if (only_existing && statret == -1 && errno == ENOENT) {
291 /* we only want to update existing files */
292 if (verbose > 1) rprintf(FINFO, "not creating new file \"%s\"\n",fname);
298 (S_ISDIR(st.st_mode) == S_ISDIR(file->mode))) {
299 /* if the file exists already and we aren't perserving
300 * permissions then act as though the remote end sent
301 * us the file permissions we already have */
302 file->mode = (file->mode & _S_IFMT) | (st.st_mode & ~_S_IFMT);
305 if (S_ISDIR(file->mode)) {
306 /* The file to be received is a directory, so we need
307 * to prepare appropriately. If there is already a
308 * file of that name and it is *not* a directory, then
309 * we need to delete it. If it doesn't exist, then
310 * recursively create it. */
312 if (dry_run) return; /* XXXX -- might cause inaccuracies?? -- mbp */
313 if (statret == 0 && !S_ISDIR(st.st_mode)) {
314 if (robust_unlink(fname) != 0) {
316 "recv_generator: unlink %s to make room for directory: %s\n",
317 full_fname(fname), strerror(errno));
322 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
323 if (!(relative_paths && errno==ENOENT &&
324 create_directory_path(fname, orig_umask)==0 &&
325 do_mkdir(fname,file->mode)==0)) {
326 rprintf(FERROR, "recv_generator: mkdir %s failed: %s\n",
327 full_fname(fname), strerror(errno));
330 /* f_out is set to -1 when doing final directory
331 permission and modification time repair */
332 if (set_perms(fname,file,NULL,0) && verbose && (f_out != -1))
333 rprintf(FINFO,"%s/\n",fname);
337 if (preserve_links && S_ISLNK(file->mode)) {
339 char lnk[MAXPATHLEN];
341 extern int safe_symlinks;
343 if (safe_symlinks && unsafe_symlink(file->link, fname)) {
345 rprintf(FINFO, "ignoring unsafe symlink %s -> \"%s\"\n",
346 full_fname(fname), file->link);
351 l = readlink(fname,lnk,MAXPATHLEN-1);
354 /* A link already pointing to the
355 * right place -- no further action
357 if (strcmp(lnk,file->link) == 0) {
358 set_perms(fname,file,&st,1);
362 /* Not a symlink, so delete whatever's
363 * already there and put a new symlink
367 if (do_symlink(file->link,fname) != 0) {
368 rprintf(FERROR, "symlink %s -> \"%s\" failed: %s\n",
369 full_fname(fname), file->link, strerror(errno));
371 set_perms(fname,file,NULL,0);
373 rprintf(FINFO,"%s -> %s\n", fname,file->link);
381 if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
383 st.st_mode != file->mode ||
384 (DEV64_T)st.st_rdev != file->rdev) {
387 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
388 fname,(int)file->mode,(int)file->rdev);
389 if (do_mknod(fname,file->mode,file->rdev) != 0) {
390 rprintf(FERROR, "mknod %s failed: %s\n",
391 full_fname(fname), strerror(errno));
393 set_perms(fname,file,NULL,0);
395 rprintf(FINFO,"%s\n",fname);
398 set_perms(fname,file,&st,1);
404 if (preserve_hard_links && check_hard_link(file)) {
406 rprintf(FINFO, "recv_generator: \"%s\" is a hard link\n",
412 if (!S_ISREG(file->mode)) {
413 rprintf(FINFO, "skipping non-regular file \"%s\"\n",fname);
419 if ((statret == -1) && (compare_dest != NULL)) {
420 /* try the file at compare_dest instead */
421 int saveerrno = errno;
422 snprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",compare_dest,fname);
423 statret = link_stat(fnamecmpbuf,&st);
424 if (!S_ISREG(st.st_mode))
429 else if (link_dest && !dry_run) {
430 if (do_link(fnamecmpbuf, fname) != 0) {
432 rprintf(FINFO,"link %s => %s : %s\n",
437 fnamecmp = fnamecmpbuf;
441 fnamecmp = fnamecmpbuf;
445 if (errno == ENOENT) {
447 if (!dry_run) write_sum_head(f_out, NULL);
448 } else if (verbose > 1) {
450 "recv_generator: failed to open %s: %s\n",
451 full_fname(fname), strerror(errno));
456 if (!S_ISREG(st.st_mode)) {
457 if (delete_file(fname) != 0) {
461 /* now pretend the file didn't exist */
463 if (!dry_run) write_sum_head(f_out, NULL);
467 if (opt_ignore_existing && fnamecmp == fname) {
469 rprintf(FINFO,"%s exists\n",fname);
473 if (update_only && cmp_modtime(st.st_mtime,file->modtime)>0 && fnamecmp == fname) {
475 rprintf(FINFO,"%s is newer\n",fname);
479 if (skip_file(fname, file, &st)) {
480 if (fnamecmp == fname)
481 set_perms(fname,file,&st,1);
490 if (disable_deltas_p()) {
492 write_sum_head(f_out, NULL);
497 fd = do_open(fnamecmp, O_RDONLY, 0);
500 rprintf(FERROR, "failed to open %s, continuing: %s\n",
501 full_fname(fnamecmp), strerror(errno));
502 /* pretend the file didn't exist */
504 write_sum_head(f_out, NULL);
509 mapbuf = map_file(fd,st.st_size);
514 rprintf(FINFO,"gen mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
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);
528 void generate_files(int f,struct file_list *flist,char *local_name,int f_recv)
532 char fbuf[MAXPATHLEN];
535 rprintf(FINFO,"generator starting pid=%d count=%d\n",
536 (int)getpid(),flist->count);
541 ? "delta-transmission disabled for local transfer or --whole-file\n"
542 : "delta transmission enabled\n");
545 /* we expect to just sit around now, so don't exit on a
546 timeout. If we really get a timeout then the other process should
550 for (i = 0; i < flist->count; i++) {
551 struct file_struct *file = flist->files[i];
552 mode_t saved_mode = file->mode;
553 if (!file->basename) continue;
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)) {
559 file->mode |= S_IWUSR; /* user write */
560 /* XXX: Could this be causing a problem on SCO? Perhaps their
561 * handling of permissions is strange? */
564 recv_generator(local_name? local_name
565 : f_name_to(file,fbuf,sizeof fbuf), flist, i, f);
567 file->mode = saved_mode;
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 for (i = read_int(f_recv); i != -1; i = read_int(f_recv)) {
582 struct file_struct *file = flist->files[i];
583 recv_generator(local_name? local_name
584 : f_name_to(file,fbuf,sizeof fbuf), flist, i, f);
589 rprintf(FINFO,"generate_files phase=%d\n",phase);