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 update_only;
34 extern int opt_ignore_existing;
35 extern int csum_length;
36 extern int ignore_times;
38 extern int io_timeout;
39 extern int protocol_version;
40 extern int always_checksum;
41 extern char *compare_dest;
45 /* choose whether to skip a particular file */
46 static int skip_file(char *fname,
47 struct file_struct *file, STRUCT_STAT *st)
49 if (st->st_size != file->length) {
53 extern int preserve_perms;
54 extern int preserve_uid;
55 extern int preserve_gid;
58 && (st->st_mode & ~_S_IFMT) != (file->mode & ~_S_IFMT))
61 if (preserve_uid && st->st_uid != file->uid)
64 if (preserve_gid && 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
105 void write_sum_head(int f, struct sum_struct *sum)
107 static struct sum_struct null_sum;
109 if (sum == (struct sum_struct *)NULL)
112 write_int(f, sum->count);
113 write_int(f, sum->blength);
114 if (protocol_version >= 27)
115 write_int(f, sum->s2length);
116 write_int(f, sum->remainder);
120 * set (initialize) the size entries in the per-file sum_struct
121 * calulating dynamic block ans checksum sizes.
123 * This is only called from generate_and_send_sums() but is a seperate
124 * function to encapsulate the logic.
126 * The block size is a rounded square root of file length.
128 * The checksum size is determined according to:
129 * blocksum_bits = BLOCKSUM_EXP + 2*log2(file_len) - log2(block_len)
130 * provided by Donovan Baarda which gives a probability of rsync
131 * algorithm corrupting data and falling back using the whole md4
134 * This might be made one of several selectable heuristics.
137 static void sum_sizes_sqroot(struct sum_struct *sum, uint64 len)
139 extern int block_size;
140 int blength, s2length, b;
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;
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=%ld rem=%ld blength=%ld s2length=%ld flength=%.0f\n",
195 (long) sum->count, (long) sum->remainder,
196 (long) sum->blength, (long) sum->s2length,
197 (double) sum->flength);
202 * Perhaps we want to just send an empty checksum set for this file,
203 * which will force the whole thing to be literally transferred.
205 * When do we do this? If the user's explicitly said they
206 * want the whole thing, or if { they haven't explicitly
207 * requested a delta, and it's local but not batch mode.}
210 static BOOL disable_deltas_p(void)
212 extern int whole_file;
213 extern int local_server;
214 extern int write_batch;
218 if (whole_file == 0 || write_batch)
225 * Generate and send a stream of signatures/checksums that describe a buffer
227 * Generate approximately one checksum every block_len bytes.
229 static void generate_and_send_sums(struct map_struct *buf, OFF_T len, int f_out)
232 struct sum_struct sum;
235 sum_sizes_sqroot(&sum, len);
237 write_sum_head(f_out, &sum);
239 for (i = 0; i < sum.count; i++) {
240 int n1 = MIN(len, sum.blength);
241 char *map = map_ptr(buf, offset, n1);
242 uint32 sum1 = get_checksum1(map, n1);
243 char sum2[SUM_LENGTH];
245 get_checksum2(map, n1, sum2);
249 "chunk[%ld] offset=%.0f len=%d sum1=%08lx\n",
250 (long)i,(double)offset,n1,(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 preserve_perms;
281 extern int only_existing;
282 extern int orig_umask;
284 if (list_only) return;
287 rprintf(FINFO,"recv_generator(%s,%d)\n",fname,i);
289 statret = link_stat(fname,&st);
291 if (only_existing && statret == -1 && errno == ENOENT) {
292 /* we only want to update existing files */
293 if (verbose > 1) rprintf(FINFO, "not creating new file \"%s\"\n",fname);
299 (S_ISDIR(st.st_mode) == S_ISDIR(file->mode))) {
300 /* if the file exists already and we aren't perserving
301 * permissions then act as though the remote end sent
302 * us the file permissions we already have */
303 file->mode = (file->mode & _S_IFMT) | (st.st_mode & ~_S_IFMT);
306 if (S_ISDIR(file->mode)) {
307 /* The file to be received is a directory, so we need
308 * to prepare appropriately. If there is already a
309 * file of that name and it is *not* a directory, then
310 * we need to delete it. If it doesn't exist, then
311 * recursively create it. */
313 if (dry_run) return; /* XXXX -- might cause inaccuracies?? -- mbp */
314 if (statret == 0 && !S_ISDIR(st.st_mode)) {
315 if (robust_unlink(fname) != 0) {
317 "recv_generator: unlink %s to make room for directory: %s\n",
318 full_fname(fname), strerror(errno));
323 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
324 if (!(relative_paths && errno==ENOENT &&
325 create_directory_path(fname, orig_umask)==0 &&
326 do_mkdir(fname,file->mode)==0)) {
327 rprintf(FERROR, "recv_generator: mkdir %s failed: %s\n",
328 full_fname(fname), strerror(errno));
331 /* f_out is set to -1 when doing final directory
332 permission and modification time repair */
333 if (set_perms(fname,file,NULL,0) && verbose && (f_out != -1))
334 rprintf(FINFO,"%s/\n",fname);
338 if (preserve_links && S_ISLNK(file->mode)) {
340 char lnk[MAXPATHLEN];
342 extern int safe_symlinks;
344 if (safe_symlinks && unsafe_symlink(file->link, fname)) {
346 rprintf(FINFO, "ignoring unsafe symlink %s -> \"%s\"\n",
347 full_fname(fname), file->link);
352 l = readlink(fname,lnk,MAXPATHLEN-1);
355 /* A link already pointing to the
356 * right place -- no further action
358 if (strcmp(lnk,file->link) == 0) {
359 set_perms(fname,file,&st,1);
363 /* Not a symlink, so delete whatever's
364 * already there and put a new symlink
368 if (do_symlink(file->link,fname) != 0) {
369 rprintf(FERROR, "symlink %s -> \"%s\" failed: %s\n",
370 full_fname(fname), file->link, strerror(errno));
372 set_perms(fname,file,NULL,0);
374 rprintf(FINFO,"%s -> %s\n", fname,file->link);
382 if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
384 st.st_mode != file->mode ||
385 (DEV64_T)st.st_rdev != file->rdev) {
388 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
389 fname,(int)file->mode,(int)file->rdev);
390 if (do_mknod(fname,file->mode,file->rdev) != 0) {
391 rprintf(FERROR, "mknod %s failed: %s\n",
392 full_fname(fname), strerror(errno));
394 set_perms(fname,file,NULL,0);
396 rprintf(FINFO,"%s\n",fname);
399 set_perms(fname,file,&st,1);
405 if (preserve_hard_links && check_hard_link(file)) {
407 rprintf(FINFO, "recv_generator: \"%s\" is a hard link\n",
413 if (!S_ISREG(file->mode)) {
414 rprintf(FINFO, "skipping non-regular file \"%s\"\n",fname);
420 if ((statret == -1) && (compare_dest != NULL)) {
421 /* try the file at compare_dest instead */
422 int saveerrno = errno;
423 snprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",compare_dest,fname);
424 statret = link_stat(fnamecmpbuf,&st);
425 if (!S_ISREG(st.st_mode))
430 else if (link_dest && !dry_run) {
431 if (do_link(fnamecmpbuf, fname) != 0) {
433 rprintf(FINFO,"link %s => %s : %s\n",
438 fnamecmp = fnamecmpbuf;
442 fnamecmp = fnamecmpbuf;
446 if (errno == ENOENT) {
448 if (!dry_run) write_sum_head(f_out, NULL);
449 } else if (verbose > 1) {
451 "recv_generator: failed to open %s: %s\n",
452 full_fname(fname), strerror(errno));
457 if (!S_ISREG(st.st_mode)) {
458 if (delete_file(fname) != 0) {
462 /* now pretend the file didn't exist */
464 if (!dry_run) write_sum_head(f_out, NULL);
468 if (opt_ignore_existing && fnamecmp == fname) {
470 rprintf(FINFO,"%s exists\n",fname);
474 if (update_only && cmp_modtime(st.st_mtime,file->modtime)>0 && fnamecmp == fname) {
476 rprintf(FINFO,"%s is newer\n",fname);
480 if (skip_file(fname, file, &st)) {
481 if (fnamecmp == fname)
482 set_perms(fname,file,&st,1);
491 if (disable_deltas_p()) {
493 write_sum_head(f_out, NULL);
498 fd = do_open(fnamecmp, O_RDONLY, 0);
501 rprintf(FERROR, "failed to open %s, continuing: %s\n",
502 full_fname(fnamecmp), strerror(errno));
503 /* pretend the file didn't exist */
505 write_sum_head(f_out, NULL);
510 mapbuf = map_file(fd,st.st_size);
515 rprintf(FINFO,"gen mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
518 rprintf(FINFO, "generating and sending sums for %d\n", i);
521 generate_and_send_sums(mapbuf, st.st_size, f_out);
524 if (mapbuf) unmap_file(mapbuf);
529 void generate_files(int f,struct file_list *flist,char *local_name,int f_recv)
533 char fbuf[MAXPATHLEN];
536 rprintf(FINFO,"generator starting pid=%d count=%d\n",
537 (int)getpid(),flist->count);
542 ? "delta-transmission disabled for local transfer or --whole-file\n"
543 : "delta transmission enabled\n");
546 /* we expect to just sit around now, so don't exit on a
547 timeout. If we really get a timeout then the other process should
551 for (i = 0; i < flist->count; i++) {
552 struct file_struct *file = flist->files[i];
553 mode_t saved_mode = file->mode;
554 if (!file->basename) continue;
556 /* we need to ensure that any directories we create have writeable
557 permissions initially so that we can create the files within
558 them. This is then fixed after the files are transferred */
559 if (!am_root && S_ISDIR(file->mode)) {
560 file->mode |= S_IWUSR; /* user write */
561 /* XXX: Could this be causing a problem on SCO? Perhaps their
562 * handling of permissions is strange? */
565 recv_generator(local_name? local_name
566 : f_name_to(file,fbuf,sizeof fbuf), flist, i, f);
568 file->mode = saved_mode;
572 csum_length = SUM_LENGTH;
576 rprintf(FINFO,"generate_files phase=%d\n",phase);
580 /* files can cycle through the system more than once
581 * to catch initial checksum errors */
582 for (i = read_int(f_recv); i != -1; i = read_int(f_recv)) {
583 struct file_struct *file = flist->files[i];
584 recv_generator(local_name? local_name
585 : f_name_to(file,fbuf,sizeof fbuf), flist, i, f);
590 rprintf(FINFO,"generate_files phase=%d\n",phase);