Commit | Line | Data |
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2f03f956 AT |
1 | /* |
2 | Copyright (C) Andrew Tridgell 1996 | |
3 | Copyright (C) Paul Mackerras 1996 | |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
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. | |
18 | */ | |
19 | ||
20 | #include "rsync.h" | |
21 | ||
22 | extern int verbose; | |
23 | extern int dry_run; | |
24 | extern int relative_paths; | |
25 | extern int preserve_links; | |
26 | extern int am_root; | |
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; | |
f83f0548 | 34 | extern int size_only; |
2f03f956 AT |
35 | extern int io_timeout; |
36 | extern int remote_version; | |
37 | extern int always_checksum; | |
38 | ||
39 | ||
40 | /* choose whether to skip a particular file */ | |
41 | static int skip_file(char *fname, | |
42 | struct file_struct *file, STRUCT_STAT *st) | |
43 | { | |
44 | if (st->st_size != file->length) { | |
45 | return 0; | |
46 | } | |
47 | ||
48 | /* if always checksum is set then we use the checksum instead | |
49 | of the file time to determine whether to sync */ | |
50 | if (always_checksum && S_ISREG(st->st_mode)) { | |
51 | char sum[MD4_SUM_LENGTH]; | |
52 | file_checksum(fname,sum,st->st_size); | |
f855a7d0 AT |
53 | if (remote_version < 21) { |
54 | return (memcmp(sum,file->sum,2) == 0); | |
55 | } else { | |
56 | return (memcmp(sum,file->sum,MD4_SUM_LENGTH) == 0); | |
57 | } | |
2f03f956 AT |
58 | } |
59 | ||
f83f0548 AT |
60 | if (size_only) { |
61 | return 1; | |
62 | } | |
63 | ||
2f03f956 AT |
64 | if (ignore_times) { |
65 | return 0; | |
66 | } | |
67 | ||
68 | return (st->st_mtime == file->modtime); | |
69 | } | |
70 | ||
71 | ||
72 | /* use a larger block size for really big files */ | |
73 | static int adapt_block_size(struct file_struct *file, int bsize) | |
74 | { | |
75 | int ret; | |
76 | ||
77 | if (bsize != BLOCK_SIZE) return bsize; | |
78 | ||
79 | ret = file->length / (10000); /* rough heuristic */ | |
80 | ret = ret & ~15; /* multiple of 16 */ | |
81 | if (ret < bsize) ret = bsize; | |
82 | if (ret > CHUNK_SIZE/2) ret = CHUNK_SIZE/2; | |
83 | return ret; | |
84 | } | |
85 | ||
86 | ||
87 | /* | |
88 | send a sums struct down a fd | |
89 | */ | |
90 | static void send_sums(struct sum_struct *s,int f_out) | |
91 | { | |
92 | int i; | |
f855a7d0 AT |
93 | |
94 | /* tell the other guy how many we are going to be doing and how many | |
95 | bytes there are in the last chunk */ | |
2f03f956 AT |
96 | write_int(f_out,s?s->count:0); |
97 | write_int(f_out,s?s->n:block_size); | |
98 | write_int(f_out,s?s->remainder:0); | |
f855a7d0 AT |
99 | |
100 | if (!s) return; | |
101 | ||
102 | for (i=0;i<s->count;i++) { | |
103 | write_int(f_out,s->sums[i].sum1); | |
104 | write_buf(f_out,s->sums[i].sum2,csum_length); | |
105 | } | |
2f03f956 AT |
106 | } |
107 | ||
108 | ||
109 | /* | |
110 | generate a stream of signatures/checksums that describe a buffer | |
111 | ||
112 | generate approximately one checksum every n bytes | |
113 | */ | |
114 | static struct sum_struct *generate_sums(struct map_struct *buf,OFF_T len,int n) | |
115 | { | |
116 | int i; | |
117 | struct sum_struct *s; | |
118 | int count; | |
119 | int block_len = n; | |
120 | int remainder = (len%block_len); | |
121 | OFF_T offset = 0; | |
122 | ||
123 | count = (len+(block_len-1))/block_len; | |
124 | ||
125 | s = (struct sum_struct *)malloc(sizeof(*s)); | |
126 | if (!s) out_of_memory("generate_sums"); | |
127 | ||
128 | s->count = count; | |
129 | s->remainder = remainder; | |
130 | s->n = n; | |
131 | s->flength = len; | |
132 | ||
133 | if (count==0) { | |
134 | s->sums = NULL; | |
135 | return s; | |
136 | } | |
137 | ||
138 | if (verbose > 3) | |
5f808dfb AT |
139 | rprintf(FINFO,"count=%d rem=%d n=%d flength=%.0f\n", |
140 | s->count,s->remainder,s->n,(double)s->flength); | |
2f03f956 AT |
141 | |
142 | s->sums = (struct sum_buf *)malloc(sizeof(s->sums[0])*s->count); | |
143 | if (!s->sums) out_of_memory("generate_sums"); | |
144 | ||
145 | for (i=0;i<count;i++) { | |
146 | int n1 = MIN(len,n); | |
147 | char *map = map_ptr(buf,offset,n1); | |
148 | ||
149 | s->sums[i].sum1 = get_checksum1(map,n1); | |
150 | get_checksum2(map,n1,s->sums[i].sum2); | |
151 | ||
152 | s->sums[i].offset = offset; | |
153 | s->sums[i].len = n1; | |
154 | s->sums[i].i = i; | |
155 | ||
156 | if (verbose > 3) | |
5f808dfb AT |
157 | rprintf(FINFO,"chunk[%d] offset=%.0f len=%d sum1=%08x\n", |
158 | i,(double)s->sums[i].offset,s->sums[i].len,s->sums[i].sum1); | |
2f03f956 AT |
159 | |
160 | len -= n1; | |
161 | offset += n1; | |
162 | } | |
163 | ||
164 | return s; | |
165 | } | |
166 | ||
167 | ||
168 | void recv_generator(char *fname,struct file_list *flist,int i,int f_out) | |
169 | { | |
170 | int fd; | |
171 | STRUCT_STAT st; | |
172 | struct map_struct *buf; | |
173 | struct sum_struct *s; | |
174 | int statret; | |
175 | struct file_struct *file = flist->files[i]; | |
375a4556 DD |
176 | char *fnamecmp; |
177 | char fnamecmpbuf[MAXPATHLEN]; | |
178 | extern char *compare_dest; | |
f7632fc6 | 179 | extern int list_only; |
4df9f368 | 180 | extern int preserve_perms; |
1347d512 | 181 | extern int only_existing; |
f7632fc6 AT |
182 | |
183 | if (list_only) return; | |
2f03f956 AT |
184 | |
185 | if (verbose > 2) | |
186 | rprintf(FINFO,"recv_generator(%s,%d)\n",fname,i); | |
187 | ||
188 | statret = link_stat(fname,&st); | |
189 | ||
1347d512 AT |
190 | if (only_existing && statret == -1 && errno == ENOENT) { |
191 | /* we only want to update existing files */ | |
192 | if (verbose > 1) rprintf(FINFO,"not creating %s\n",fname); | |
193 | return; | |
194 | } | |
195 | ||
4df9f368 AT |
196 | if (statret == 0 && |
197 | !preserve_perms && | |
198 | (S_ISDIR(st.st_mode) == S_ISDIR(file->mode))) { | |
199 | /* if the file exists already and we aren't perserving | |
200 | presmissions then act as though the remote end sent | |
201 | us the file permissions we already have */ | |
7e0ca8e2 | 202 | file->mode = (file->mode & _S_IFMT) | (st.st_mode & ~_S_IFMT); |
4df9f368 AT |
203 | } |
204 | ||
2f03f956 AT |
205 | if (S_ISDIR(file->mode)) { |
206 | if (dry_run) return; | |
207 | if (statret == 0 && !S_ISDIR(st.st_mode)) { | |
c7c11a0d | 208 | if (robust_unlink(fname) != 0) { |
2f03f956 AT |
209 | rprintf(FERROR,"unlink %s : %s\n",fname,strerror(errno)); |
210 | return; | |
211 | } | |
212 | statret = -1; | |
213 | } | |
214 | if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) { | |
215 | if (!(relative_paths && errno==ENOENT && | |
216 | create_directory_path(fname)==0 && | |
217 | do_mkdir(fname,file->mode)==0)) { | |
218 | rprintf(FERROR,"mkdir %s : %s (2)\n", | |
219 | fname,strerror(errno)); | |
220 | } | |
221 | } | |
222 | if (set_perms(fname,file,NULL,0) && verbose) | |
223 | rprintf(FINFO,"%s/\n",fname); | |
224 | return; | |
225 | } | |
226 | ||
227 | if (preserve_links && S_ISLNK(file->mode)) { | |
228 | #if SUPPORT_LINKS | |
229 | char lnk[MAXPATHLEN]; | |
230 | int l; | |
231 | extern int safe_symlinks; | |
232 | ||
233 | if (safe_symlinks && unsafe_symlink(file->link, fname)) { | |
234 | if (verbose) { | |
235 | rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n", | |
236 | fname,file->link); | |
237 | } | |
238 | return; | |
239 | } | |
240 | if (statret == 0) { | |
241 | l = readlink(fname,lnk,MAXPATHLEN-1); | |
242 | if (l > 0) { | |
243 | lnk[l] = 0; | |
7e0ca8e2 | 244 | if (strcmp(lnk,file->link) == 0) { |
2f03f956 AT |
245 | set_perms(fname,file,&st,1); |
246 | return; | |
247 | } | |
248 | } | |
249 | } | |
250 | delete_file(fname); | |
251 | if (do_symlink(file->link,fname) != 0) { | |
74a7f81d | 252 | rprintf(FERROR,"symlink %s -> %s : %s\n", |
2f03f956 AT |
253 | fname,file->link,strerror(errno)); |
254 | } else { | |
255 | set_perms(fname,file,NULL,0); | |
256 | if (verbose) { | |
257 | rprintf(FINFO,"%s -> %s\n", | |
258 | fname,file->link); | |
259 | } | |
260 | } | |
261 | #endif | |
262 | return; | |
263 | } | |
264 | ||
265 | #ifdef HAVE_MKNOD | |
266 | if (am_root && preserve_devices && IS_DEVICE(file->mode)) { | |
267 | if (statret != 0 || | |
268 | st.st_mode != file->mode || | |
269 | st.st_rdev != file->rdev) { | |
270 | delete_file(fname); | |
271 | if (verbose > 2) | |
272 | rprintf(FINFO,"mknod(%s,0%o,0x%x)\n", | |
273 | fname,(int)file->mode,(int)file->rdev); | |
274 | if (do_mknod(fname,file->mode,file->rdev) != 0) { | |
275 | rprintf(FERROR,"mknod %s : %s\n",fname,strerror(errno)); | |
276 | } else { | |
277 | set_perms(fname,file,NULL,0); | |
278 | if (verbose) | |
279 | rprintf(FINFO,"%s\n",fname); | |
280 | } | |
281 | } else { | |
282 | set_perms(fname,file,&st,1); | |
283 | } | |
284 | return; | |
285 | } | |
286 | #endif | |
287 | ||
288 | if (preserve_hard_links && check_hard_link(file)) { | |
289 | if (verbose > 1) | |
290 | rprintf(FINFO,"%s is a hard link\n",f_name(file)); | |
291 | return; | |
292 | } | |
293 | ||
294 | if (!S_ISREG(file->mode)) { | |
295 | rprintf(FINFO,"skipping non-regular file %s\n",fname); | |
296 | return; | |
297 | } | |
298 | ||
375a4556 DD |
299 | fnamecmp = fname; |
300 | ||
301 | if ((statret == -1) && (compare_dest != NULL)) { | |
302 | /* try the file at compare_dest instead */ | |
303 | int saveerrno = errno; | |
37f9805d | 304 | slprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",compare_dest,fname); |
375a4556 DD |
305 | statret = link_stat(fnamecmpbuf,&st); |
306 | if (!S_ISREG(st.st_mode)) | |
307 | statret = -1; | |
308 | if (statret == -1) | |
309 | errno = saveerrno; | |
310 | else | |
311 | fnamecmp = fnamecmpbuf; | |
312 | } | |
313 | ||
2f03f956 AT |
314 | if (statret == -1) { |
315 | if (errno == ENOENT) { | |
316 | write_int(f_out,i); | |
317 | if (!dry_run) send_sums(NULL,f_out); | |
318 | } else { | |
319 | if (verbose > 1) | |
320 | rprintf(FERROR,"recv_generator failed to open %s\n",fname); | |
321 | } | |
322 | return; | |
323 | } | |
324 | ||
325 | if (!S_ISREG(st.st_mode)) { | |
326 | if (delete_file(fname) != 0) { | |
327 | return; | |
328 | } | |
329 | ||
330 | /* now pretend the file didn't exist */ | |
331 | write_int(f_out,i); | |
332 | if (!dry_run) send_sums(NULL,f_out); | |
333 | return; | |
334 | } | |
335 | ||
375a4556 | 336 | if (update_only && st.st_mtime > file->modtime && fnamecmp == fname) { |
2f03f956 AT |
337 | if (verbose > 1) |
338 | rprintf(FINFO,"%s is newer\n",fname); | |
339 | return; | |
340 | } | |
341 | ||
342 | if (skip_file(fname, file, &st)) { | |
bd4ed7f7 DD |
343 | if (fnamecmp == fname) |
344 | set_perms(fname,file,&st,1); | |
2f03f956 AT |
345 | return; |
346 | } | |
347 | ||
348 | if (dry_run) { | |
349 | write_int(f_out,i); | |
350 | return; | |
351 | } | |
352 | ||
353 | if (whole_file) { | |
354 | write_int(f_out,i); | |
355 | send_sums(NULL,f_out); | |
356 | return; | |
357 | } | |
358 | ||
359 | /* open the file */ | |
8c9fd200 | 360 | fd = do_open(fnamecmp, O_RDONLY, 0); |
2f03f956 AT |
361 | |
362 | if (fd == -1) { | |
60be6acf DD |
363 | rprintf(FERROR,"failed to open %s, continuing : %s\n",fnamecmp,strerror(errno)); |
364 | /* pretend the file didn't exist */ | |
365 | write_int(f_out,i); | |
366 | send_sums(NULL,f_out); | |
2f03f956 AT |
367 | return; |
368 | } | |
369 | ||
370 | if (st.st_size > 0) { | |
371 | buf = map_file(fd,st.st_size); | |
372 | } else { | |
373 | buf = NULL; | |
374 | } | |
375 | ||
376 | if (verbose > 3) | |
5f808dfb | 377 | rprintf(FINFO,"gen mapped %s of size %.0f\n",fnamecmp,(double)st.st_size); |
2f03f956 AT |
378 | |
379 | s = generate_sums(buf,st.st_size,adapt_block_size(file, block_size)); | |
380 | ||
381 | if (verbose > 2) | |
382 | rprintf(FINFO,"sending sums for %d\n",i); | |
383 | ||
384 | write_int(f_out,i); | |
385 | send_sums(s,f_out); | |
386 | ||
387 | close(fd); | |
388 | if (buf) unmap_file(buf); | |
389 | ||
390 | free_sums(s); | |
391 | } | |
392 | ||
393 | ||
394 | ||
395 | void generate_files(int f,struct file_list *flist,char *local_name,int f_recv) | |
396 | { | |
397 | int i; | |
398 | int phase=0; | |
399 | ||
400 | if (verbose > 2) | |
401 | rprintf(FINFO,"generator starting pid=%d count=%d\n", | |
402 | (int)getpid(),flist->count); | |
403 | ||
404 | for (i = 0; i < flist->count; i++) { | |
405 | struct file_struct *file = flist->files[i]; | |
406 | mode_t saved_mode = file->mode; | |
407 | if (!file->basename) continue; | |
408 | ||
409 | /* we need to ensure that any directories we create have writeable | |
410 | permissions initially so that we can create the files within | |
411 | them. This is then fixed after the files are transferred */ | |
412 | if (!am_root && S_ISDIR(file->mode)) { | |
413 | file->mode |= S_IWUSR; /* user write */ | |
414 | } | |
415 | ||
416 | recv_generator(local_name?local_name:f_name(file), | |
417 | flist,i,f); | |
418 | ||
419 | file->mode = saved_mode; | |
420 | } | |
421 | ||
422 | phase++; | |
423 | csum_length = SUM_LENGTH; | |
424 | ignore_times=1; | |
425 | ||
426 | if (verbose > 2) | |
427 | rprintf(FINFO,"generate_files phase=%d\n",phase); | |
428 | ||
429 | write_int(f,-1); | |
430 | ||
431 | /* we expect to just sit around now, so don't exit on a | |
432 | timeout. If we really get a timeout then the other process should | |
433 | exit */ | |
434 | io_timeout = 0; | |
435 | ||
436 | if (remote_version >= 13) { | |
437 | /* in newer versions of the protocol the files can cycle through | |
438 | the system more than once to catch initial checksum errors */ | |
439 | for (i=read_int(f_recv); i != -1; i=read_int(f_recv)) { | |
440 | struct file_struct *file = flist->files[i]; | |
441 | recv_generator(local_name?local_name:f_name(file), | |
442 | flist,i,f); | |
443 | } | |
444 | ||
445 | phase++; | |
446 | if (verbose > 2) | |
447 | rprintf(FINFO,"generate_files phase=%d\n",phase); | |
448 | ||
449 | write_int(f,-1); | |
450 | } | |
451 | } |