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 snprintf(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)) {
227 /* The file to be received is a directory, so we need
228 * to prepare appropriately. If there is already a
229 * file of that name and it is *not* a directory, then
230 * we need to delete it. If it doesn't exist, then
231 * recursively create it. */
234 if (statret == 0 && !S_ISDIR(st.st_mode)) {
235 if (robust_unlink(fname) != 0) {
236 rprintf(FERROR,"recv_generator: unlink %s: %s\n",
237 fname,strerror(errno));
242 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
243 if (!(relative_paths && errno==ENOENT &&
244 create_directory_path(fname)==0 &&
245 do_mkdir(fname,file->mode)==0)) {
246 rprintf(FERROR,"recv_generator: mkdir %s: %s (2)\n",
247 fname,strerror(errno));
250 /* f_out is set to -1 when doing final directory
251 permission and modification time repair */
252 if (set_perms(fname,file,NULL,0) && verbose && (f_out != -1))
253 rprintf(FINFO,"%s/\n",fname);
257 if (preserve_links && S_ISLNK(file->mode)) {
259 char lnk[MAXPATHLEN];
261 extern int safe_symlinks;
263 if (safe_symlinks && unsafe_symlink(file->link, fname)) {
265 rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n",
271 l = readlink(fname,lnk,MAXPATHLEN-1);
274 if (strcmp(lnk,file->link) == 0) {
275 set_perms(fname,file,&st,1);
281 if (do_symlink(file->link,fname) != 0) {
282 rprintf(FERROR,"symlink %s -> %s : %s\n",
283 fname,file->link,strerror(errno));
285 set_perms(fname,file,NULL,0);
287 rprintf(FINFO,"%s -> %s\n",
296 if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
298 st.st_mode != file->mode ||
299 st.st_rdev != file->rdev) {
302 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
303 fname,(int)file->mode,(int)file->rdev);
304 if (do_mknod(fname,file->mode,file->rdev) != 0) {
305 rprintf(FERROR,"mknod %s : %s\n",fname,strerror(errno));
307 set_perms(fname,file,NULL,0);
309 rprintf(FINFO,"%s\n",fname);
312 set_perms(fname,file,&st,1);
318 if (preserve_hard_links && check_hard_link(file)) {
320 rprintf(FINFO,"%s is a hard link\n",f_name(file));
324 if (!S_ISREG(file->mode)) {
325 rprintf(FINFO,"skipping non-regular file %s\n",fname);
331 if ((statret == -1) && (compare_dest != NULL)) {
332 /* try the file at compare_dest instead */
333 int saveerrno = errno;
334 snprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",compare_dest,fname);
335 statret = link_stat(fnamecmpbuf,&st);
336 if (!S_ISREG(st.st_mode))
341 fnamecmp = fnamecmpbuf;
345 if (errno == ENOENT) {
347 if (!dry_run) send_sums(NULL,f_out);
350 rprintf(FERROR,"recv_generator failed to open %s\n",fname);
355 if (!S_ISREG(st.st_mode)) {
356 if (delete_file(fname) != 0) {
360 /* now pretend the file didn't exist */
362 if (!dry_run) send_sums(NULL,f_out);
366 if (update_only && cmp_modtime(st.st_mtime,file->modtime)>0 && fnamecmp == fname) {
368 rprintf(FINFO,"%s is newer\n",fname);
372 if (skip_file(fname, file, &st)) {
373 if (fnamecmp == fname)
374 set_perms(fname,file,&st,1);
385 send_sums(NULL,f_out);
390 fd = do_open(fnamecmp, O_RDONLY, 0);
393 rprintf(FERROR,"failed to open %s, continuing : %s\n",fnamecmp,strerror(errno));
394 /* pretend the file didn't exist */
396 send_sums(NULL,f_out);
400 if (st.st_size > 0) {
401 buf = map_file(fd,st.st_size);
407 rprintf(FINFO,"gen mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
409 s = generate_sums(buf,st.st_size,adapt_block_size(file, block_size));
412 rprintf(FINFO,"sending sums for %d\n",i);
418 if (buf) unmap_file(buf);
425 void generate_files(int f,struct file_list *flist,char *local_name,int f_recv)
431 rprintf(FINFO,"generator starting pid=%d count=%d\n",
432 (int)getpid(),flist->count);
434 /* we expect to just sit around now, so don't exit on a
435 timeout. If we really get a timeout then the other process should
439 for (i = 0; i < flist->count; i++) {
440 struct file_struct *file = flist->files[i];
441 mode_t saved_mode = file->mode;
442 if (!file->basename) continue;
444 /* we need to ensure that any directories we create have writeable
445 permissions initially so that we can create the files within
446 them. This is then fixed after the files are transferred */
447 if (!am_root && S_ISDIR(file->mode)) {
448 file->mode |= S_IWUSR; /* user write */
449 /* XXX: Could this be causing a problem on SCO? Perhaps their
450 * handling of permissions is strange? */
453 recv_generator(local_name?local_name:f_name(file),
456 file->mode = saved_mode;
460 csum_length = SUM_LENGTH;
464 rprintf(FINFO,"generate_files phase=%d\n",phase);
468 if (remote_version >= 13) {
469 /* in newer versions of the protocol the files can cycle through
470 the system more than once to catch initial checksum errors */
471 for (i=read_int(f_recv); i != -1; i=read_int(f_recv)) {
472 struct file_struct *file = flist->files[i];
473 recv_generator(local_name?local_name:f_name(file),
479 rprintf(FINFO,"generate_files phase=%d\n",phase);