2 Copyright (C) Andrew Tridgell 1996
3 Copyright (C) Paul Mackerras 1996
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 extern int relative_paths;
25 extern int preserve_links;
27 extern int preserve_devices;
28 extern int preserve_hard_links;
29 extern int update_only;
30 extern int whole_file;
31 extern int block_size;
32 extern int csum_length;
33 extern int ignore_times;
34 extern int io_timeout;
35 extern int remote_version;
36 extern int always_checksum;
39 /* choose whether to skip a particular file */
40 static int skip_file(char *fname,
41 struct file_struct *file, STRUCT_STAT *st)
43 if (st->st_size != file->length) {
47 /* if always checksum is set then we use the checksum instead
48 of the file time to determine whether to sync */
49 if (always_checksum && S_ISREG(st->st_mode)) {
50 char sum[MD4_SUM_LENGTH];
51 file_checksum(fname,sum,st->st_size);
52 return (memcmp(sum,file->sum,csum_length) == 0);
59 return (st->st_mtime == file->modtime);
63 /* use a larger block size for really big files */
64 static int adapt_block_size(struct file_struct *file, int bsize)
68 if (bsize != BLOCK_SIZE) return bsize;
70 ret = file->length / (10000); /* rough heuristic */
71 ret = ret & ~15; /* multiple of 16 */
72 if (ret < bsize) ret = bsize;
73 if (ret > CHUNK_SIZE/2) ret = CHUNK_SIZE/2;
79 send a sums struct down a fd
81 static void send_sums(struct sum_struct *s,int f_out)
85 /* tell the other guy how many we are going to be doing and how many
86 bytes there are in the last chunk */
87 write_int(f_out,s?s->count:0);
88 write_int(f_out,s?s->n:block_size);
89 write_int(f_out,s?s->remainder:0);
91 for (i=0;i<s->count;i++) {
92 write_int(f_out,s->sums[i].sum1);
93 write_buf(f_out,s->sums[i].sum2,csum_length);
99 generate a stream of signatures/checksums that describe a buffer
101 generate approximately one checksum every n bytes
103 static struct sum_struct *generate_sums(struct map_struct *buf,OFF_T len,int n)
106 struct sum_struct *s;
109 int remainder = (len%block_len);
112 count = (len+(block_len-1))/block_len;
114 s = (struct sum_struct *)malloc(sizeof(*s));
115 if (!s) out_of_memory("generate_sums");
118 s->remainder = remainder;
128 rprintf(FINFO,"count=%d rem=%d n=%d flength=%d\n",
129 s->count,s->remainder,s->n,(int)s->flength);
131 s->sums = (struct sum_buf *)malloc(sizeof(s->sums[0])*s->count);
132 if (!s->sums) out_of_memory("generate_sums");
134 for (i=0;i<count;i++) {
136 char *map = map_ptr(buf,offset,n1);
138 s->sums[i].sum1 = get_checksum1(map,n1);
139 get_checksum2(map,n1,s->sums[i].sum2);
141 s->sums[i].offset = offset;
146 rprintf(FINFO,"chunk[%d] offset=%d len=%d sum1=%08x\n",
147 i,(int)s->sums[i].offset,s->sums[i].len,s->sums[i].sum1);
157 void recv_generator(char *fname,struct file_list *flist,int i,int f_out)
161 struct map_struct *buf;
162 struct sum_struct *s;
164 struct file_struct *file = flist->files[i];
166 char fnamecmpbuf[MAXPATHLEN];
167 extern char *compare_dest;
170 rprintf(FINFO,"recv_generator(%s,%d)\n",fname,i);
172 statret = link_stat(fname,&st);
174 if (S_ISDIR(file->mode)) {
176 if (statret == 0 && !S_ISDIR(st.st_mode)) {
177 if (do_unlink(fname) != 0) {
178 rprintf(FERROR,"unlink %s : %s\n",fname,strerror(errno));
183 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
184 if (!(relative_paths && errno==ENOENT &&
185 create_directory_path(fname)==0 &&
186 do_mkdir(fname,file->mode)==0)) {
187 rprintf(FERROR,"mkdir %s : %s (2)\n",
188 fname,strerror(errno));
191 if (set_perms(fname,file,NULL,0) && verbose)
192 rprintf(FINFO,"%s/\n",fname);
196 if (preserve_links && S_ISLNK(file->mode)) {
198 char lnk[MAXPATHLEN];
200 extern int safe_symlinks;
202 if (safe_symlinks && unsafe_symlink(file->link, fname)) {
204 rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n",
210 l = readlink(fname,lnk,MAXPATHLEN-1);
213 if (strcmp(lnk,file->link) == 0) {
214 set_perms(fname,file,&st,1);
220 if (do_symlink(file->link,fname) != 0) {
221 rprintf(FERROR,"link %s -> %s : %s\n",
222 fname,file->link,strerror(errno));
224 set_perms(fname,file,NULL,0);
226 rprintf(FINFO,"%s -> %s\n",
235 if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
237 st.st_mode != file->mode ||
238 st.st_rdev != file->rdev) {
241 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
242 fname,(int)file->mode,(int)file->rdev);
243 if (do_mknod(fname,file->mode,file->rdev) != 0) {
244 rprintf(FERROR,"mknod %s : %s\n",fname,strerror(errno));
246 set_perms(fname,file,NULL,0);
248 rprintf(FINFO,"%s\n",fname);
251 set_perms(fname,file,&st,1);
257 if (preserve_hard_links && check_hard_link(file)) {
259 rprintf(FINFO,"%s is a hard link\n",f_name(file));
263 if (!S_ISREG(file->mode)) {
264 rprintf(FINFO,"skipping non-regular file %s\n",fname);
270 if ((statret == -1) && (compare_dest != NULL)) {
271 /* try the file at compare_dest instead */
272 int saveerrno = errno;
273 slprintf(fnamecmpbuf,MAXPATHLEN-1,"%s/%s",compare_dest,fname);
274 statret = link_stat(fnamecmpbuf,&st);
275 if (!S_ISREG(st.st_mode))
280 fnamecmp = fnamecmpbuf;
284 if (errno == ENOENT) {
286 if (!dry_run) send_sums(NULL,f_out);
289 rprintf(FERROR,"recv_generator failed to open %s\n",fname);
294 if (!S_ISREG(st.st_mode)) {
295 if (delete_file(fname) != 0) {
299 /* now pretend the file didn't exist */
301 if (!dry_run) send_sums(NULL,f_out);
305 if (update_only && st.st_mtime > file->modtime && fnamecmp == fname) {
307 rprintf(FINFO,"%s is newer\n",fname);
311 if (skip_file(fname, file, &st)) {
312 set_perms(fname,file,&st,1);
323 send_sums(NULL,f_out);
328 fd = open(fnamecmp,O_RDONLY);
331 rprintf(FERROR,"failed to open %s : %s\n",fnamecmp,strerror(errno));
332 rprintf(FERROR,"skipping %s\n",fname);
336 if (st.st_size > 0) {
337 buf = map_file(fd,st.st_size);
343 rprintf(FINFO,"gen mapped %s of size %d\n",fnamecmp,(int)st.st_size);
345 s = generate_sums(buf,st.st_size,adapt_block_size(file, block_size));
348 rprintf(FINFO,"sending sums for %d\n",i);
354 if (buf) unmap_file(buf);
361 void generate_files(int f,struct file_list *flist,char *local_name,int f_recv)
367 rprintf(FINFO,"generator starting pid=%d count=%d\n",
368 (int)getpid(),flist->count);
370 for (i = 0; i < flist->count; i++) {
371 struct file_struct *file = flist->files[i];
372 mode_t saved_mode = file->mode;
373 if (!file->basename) continue;
375 /* we need to ensure that any directories we create have writeable
376 permissions initially so that we can create the files within
377 them. This is then fixed after the files are transferred */
378 if (!am_root && S_ISDIR(file->mode)) {
379 file->mode |= S_IWUSR; /* user write */
382 recv_generator(local_name?local_name:f_name(file),
385 file->mode = saved_mode;
389 csum_length = SUM_LENGTH;
393 rprintf(FINFO,"generate_files phase=%d\n",phase);
397 /* we expect to just sit around now, so don't exit on a
398 timeout. If we really get a timeout then the other process should
402 if (remote_version >= 13) {
403 /* in newer versions of the protocol the files can cycle through
404 the system more than once to catch initial checksum errors */
405 for (i=read_int(f_recv); i != -1; i=read_int(f_recv)) {
406 struct file_struct *file = flist->files[i];
407 recv_generator(local_name?local_name:f_name(file),
413 rprintf(FINFO,"generate_files phase=%d\n",phase);