1 /* -*- c-file-style: "linux" -*-
3 Copyright (C) 1996-2000 by Andrew Tridgell
4 Copyright (C) Paul Mackerras 1996
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 extern int relative_paths;
26 extern int preserve_links;
28 extern int preserve_devices;
29 extern int preserve_hard_links;
30 extern int update_only;
31 extern int whole_file;
32 extern int block_size;
33 extern int csum_length;
34 extern int ignore_times;
36 extern int io_timeout;
37 extern int remote_version;
38 extern int always_checksum;
39 extern int modify_window;
40 extern char *compare_dest;
43 /* choose whether to skip a particular file */
44 static int skip_file(char *fname,
45 struct file_struct *file, STRUCT_STAT *st)
47 if (st->st_size != file->length) {
51 /* if always checksum is set then we use the checksum instead
52 of the file time to determine whether to sync */
53 if (always_checksum && S_ISREG(st->st_mode)) {
54 char sum[MD4_SUM_LENGTH];
55 char fnamecmpdest[MAXPATHLEN];
57 if (compare_dest != NULL) {
58 if (access(fname, 0) != 0) {
59 slprintf(fnamecmpdest,MAXPATHLEN,"%s/%s",
64 file_checksum(fname,sum,st->st_size);
65 if (remote_version < 21) {
66 return (memcmp(sum,file->sum,2) == 0);
68 return (memcmp(sum,file->sum,MD4_SUM_LENGTH) == 0);
80 return (cmp_modtime(st->st_mtime,file->modtime) == 0);
84 /* use a larger block size for really big files */
85 static int adapt_block_size(struct file_struct *file, int bsize)
89 if (bsize != BLOCK_SIZE) return bsize;
91 ret = file->length / (10000); /* rough heuristic */
92 ret = ret & ~15; /* multiple of 16 */
93 if (ret < bsize) ret = bsize;
94 if (ret > CHUNK_SIZE/2) ret = CHUNK_SIZE/2;
100 send a sums struct down a fd
102 static void send_sums(struct sum_struct *s,int f_out)
106 /* tell the other guy how many we are going to be doing and how many
107 bytes there are in the last chunk */
108 write_int(f_out,s?s->count:0);
109 write_int(f_out,s?s->n:block_size);
110 write_int(f_out,s?s->remainder:0);
114 for (i=0;i<s->count;i++) {
115 write_int(f_out,s->sums[i].sum1);
116 write_buf(f_out,s->sums[i].sum2,csum_length);
122 generate a stream of signatures/checksums that describe a buffer
124 generate approximately one checksum every n bytes
126 static struct sum_struct *generate_sums(struct map_struct *buf,OFF_T len,int n)
129 struct sum_struct *s;
132 int remainder = (len%block_len);
135 count = (len+(block_len-1))/block_len;
137 s = (struct sum_struct *)malloc(sizeof(*s));
138 if (!s) out_of_memory("generate_sums");
141 s->remainder = remainder;
151 rprintf(FINFO,"count=%d rem=%d n=%d flength=%.0f\n",
152 s->count,s->remainder,s->n,(double)s->flength);
154 s->sums = (struct sum_buf *)malloc(sizeof(s->sums[0])*s->count);
155 if (!s->sums) out_of_memory("generate_sums");
157 for (i=0;i<count;i++) {
159 char *map = map_ptr(buf,offset,n1);
161 s->sums[i].sum1 = get_checksum1(map,n1);
162 get_checksum2(map,n1,s->sums[i].sum2);
164 s->sums[i].offset = offset;
169 rprintf(FINFO,"chunk[%d] offset=%.0f len=%d sum1=%08x\n",
170 i,(double)s->sums[i].offset,s->sums[i].len,s->sums[i].sum1);
182 * Acts on file number I from FLIST, whose name is fname.
184 * First fixes up permissions, then generates checksums for the file.
186 * (This comment was added later by mbp who was trying to work it out;
187 * it might be wrong.)
189 void recv_generator(char *fname,struct file_list *flist,int i,int f_out)
193 struct map_struct *buf;
194 struct sum_struct *s;
196 struct file_struct *file = flist->files[i];
198 char fnamecmpbuf[MAXPATHLEN];
199 extern char *compare_dest;
200 extern int list_only;
201 extern int preserve_perms;
202 extern int only_existing;
204 if (list_only) return;
207 rprintf(FINFO,"recv_generator(%s,%d)\n",fname,i);
209 statret = link_stat(fname,&st);
211 if (only_existing && statret == -1 && errno == ENOENT) {
212 /* we only want to update existing files */
213 if (verbose > 1) rprintf(FINFO,"not creating %s\n",fname);
219 (S_ISDIR(st.st_mode) == S_ISDIR(file->mode))) {
220 /* if the file exists already and we aren't perserving
221 presmissions then act as though the remote end sent
222 us the file permissions we already have */
223 file->mode = (file->mode & _S_IFMT) | (st.st_mode & ~_S_IFMT);
226 if (S_ISDIR(file->mode)) {
228 if (statret == 0 && !S_ISDIR(st.st_mode)) {
229 if (robust_unlink(fname) != 0) {
230 rprintf(FERROR,"recv_generator: unlink %s: %s\n",fname,strerror(errno));
235 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
236 if (!(relative_paths && errno==ENOENT &&
237 create_directory_path(fname)==0 &&
238 do_mkdir(fname,file->mode)==0)) {
239 rprintf(FERROR,"recv_generator: mkdir %s: %s (2)\n",
240 fname,strerror(errno));
243 if (set_perms(fname,file,NULL,0) && verbose)
244 rprintf(FINFO,"%s/\n",fname);
248 if (preserve_links && S_ISLNK(file->mode)) {
250 char lnk[MAXPATHLEN];
252 extern int safe_symlinks;
254 if (safe_symlinks && unsafe_symlink(file->link, fname)) {
256 rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n",
262 l = readlink(fname,lnk,MAXPATHLEN-1);
265 if (strcmp(lnk,file->link) == 0) {
266 set_perms(fname,file,&st,1);
272 if (do_symlink(file->link,fname) != 0) {
273 rprintf(FERROR,"symlink %s -> %s : %s\n",
274 fname,file->link,strerror(errno));
276 set_perms(fname,file,NULL,0);
278 rprintf(FINFO,"%s -> %s\n",
287 if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
289 st.st_mode != file->mode ||
290 st.st_rdev != file->rdev) {
293 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
294 fname,(int)file->mode,(int)file->rdev);
295 if (do_mknod(fname,file->mode,file->rdev) != 0) {
296 rprintf(FERROR,"mknod %s : %s\n",fname,strerror(errno));
298 set_perms(fname,file,NULL,0);
300 rprintf(FINFO,"%s\n",fname);
303 set_perms(fname,file,&st,1);
309 if (preserve_hard_links && check_hard_link(file)) {
311 rprintf(FINFO,"%s is a hard link\n",f_name(file));
315 if (!S_ISREG(file->mode)) {
316 rprintf(FINFO,"skipping non-regular file %s\n",fname);
322 if ((statret == -1) && (compare_dest != NULL)) {
323 /* try the file at compare_dest instead */
324 int saveerrno = errno;
325 slprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",compare_dest,fname);
326 statret = link_stat(fnamecmpbuf,&st);
327 if (!S_ISREG(st.st_mode))
332 fnamecmp = fnamecmpbuf;
336 if (errno == ENOENT) {
338 if (!dry_run) send_sums(NULL,f_out);
341 rprintf(FERROR,"recv_generator failed to open %s\n",fname);
346 if (!S_ISREG(st.st_mode)) {
347 if (delete_file(fname) != 0) {
351 /* now pretend the file didn't exist */
353 if (!dry_run) send_sums(NULL,f_out);
357 if (update_only && cmp_modtime(st.st_mtime,file->modtime)>0 && fnamecmp == fname) {
359 rprintf(FINFO,"%s is newer\n",fname);
363 if (skip_file(fname, file, &st)) {
364 if (fnamecmp == fname)
365 set_perms(fname,file,&st,1);
376 send_sums(NULL,f_out);
381 fd = do_open(fnamecmp, O_RDONLY, 0);
384 rprintf(FERROR,"failed to open %s, continuing : %s\n",fnamecmp,strerror(errno));
385 /* pretend the file didn't exist */
387 send_sums(NULL,f_out);
391 if (st.st_size > 0) {
392 buf = map_file(fd,st.st_size);
398 rprintf(FINFO,"gen mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
400 s = generate_sums(buf,st.st_size,adapt_block_size(file, block_size));
403 rprintf(FINFO,"sending sums for %d\n",i);
409 if (buf) unmap_file(buf);
416 void generate_files(int f,struct file_list *flist,char *local_name,int f_recv)
422 rprintf(FINFO,"generator starting pid=%d count=%d\n",
423 (int)getpid(),flist->count);
425 for (i = 0; i < flist->count; i++) {
426 struct file_struct *file = flist->files[i];
427 mode_t saved_mode = file->mode;
428 if (!file->basename) continue;
430 /* we need to ensure that any directories we create have writeable
431 permissions initially so that we can create the files within
432 them. This is then fixed after the files are transferred */
433 if (!am_root && S_ISDIR(file->mode)) {
434 file->mode |= S_IWUSR; /* user write */
437 recv_generator(local_name?local_name:f_name(file),
440 file->mode = saved_mode;
444 csum_length = SUM_LENGTH;
448 rprintf(FINFO,"generate_files phase=%d\n",phase);
452 /* we expect to just sit around now, so don't exit on a
453 timeout. If we really get a timeout then the other process should
457 if (remote_version >= 13) {
458 /* in newer versions of the protocol the files can cycle through
459 the system more than once to catch initial checksum errors */
460 for (i=read_int(f_recv); i != -1; i=read_int(f_recv)) {
461 struct file_struct *file = flist->files[i];
462 recv_generator(local_name?local_name:f_name(file),
468 rprintf(FINFO,"generate_files phase=%d\n",phase);