Undo last setting of blocking_io. I hadn't reviewed the code well enough;
[rsync.git] / receiver.c
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 recurse;
24 extern int delete_mode;
25 extern int remote_version;
26 extern int csum_length;
27 extern struct stats stats;
28 extern int dry_run;
29 extern int am_server;
30 extern int relative_paths;
31 extern int preserve_hard_links;
32 extern int cvs_exclude;
33 extern int io_error;
34 extern char *tmpdir;
35 extern char *compare_dest;
36 extern int make_backups;
37 extern char *backup_suffix;
38
39 static struct delete_list {
40         dev_t dev;
41         INO_T inode;
42 } *delete_list;
43 static int dlist_len, dlist_alloc_len;
44
45 /* yuck! This function wouldn't have been necessary if I had the sorting
46    algorithm right. Unfortunately fixing the sorting algorithm would introduce
47    a backward incompatibility as file list indexes are sent over the link.
48 */
49 static int delete_already_done(struct file_list *flist,int j)
50 {
51         int i;
52         STRUCT_STAT st;
53
54         if (link_stat(f_name(flist->files[j]), &st)) return 1;
55
56         for (i=0;i<dlist_len;i++) {
57                 if (st.st_ino == delete_list[i].inode &&
58                     st.st_dev == delete_list[i].dev)
59                         return 1;
60         }
61
62         return 0;
63 }
64
65 static void add_delete_entry(struct file_struct *file)
66 {
67         if (dlist_len == dlist_alloc_len) {
68                 dlist_alloc_len += 1024;
69                 delete_list = (struct delete_list *)Realloc(delete_list, sizeof(delete_list[0])*dlist_alloc_len);
70                 if (!delete_list) out_of_memory("add_delete_entry");
71         }
72
73         delete_list[dlist_len].dev = file->dev;
74         delete_list[dlist_len].inode = file->inode;
75         dlist_len++;
76
77         if (verbose > 3)
78                 rprintf(FINFO,"added %s to delete list\n", f_name(file));
79 }
80
81 static void delete_one(struct file_struct *f)
82 {
83         if (!S_ISDIR(f->mode)) {
84                 if (robust_unlink(f_name(f)) != 0) {
85                         rprintf(FERROR,"unlink %s : %s\n",f_name(f),strerror(errno));
86                 } else if (verbose) {
87                         rprintf(FINFO,"deleting %s\n",f_name(f));
88                 }
89         } else {    
90                 if (do_rmdir(f_name(f)) != 0) {
91                         if (errno != ENOTEMPTY && errno != EEXIST)
92                                 rprintf(FERROR,"rmdir %s : %s\n",f_name(f),strerror(errno));
93                 } else if (verbose) {
94                         rprintf(FINFO,"deleting directory %s\n",f_name(f));      
95                 }
96         }
97 }
98
99
100
101
102 /* this deletes any files on the receiving side that are not present
103    on the sending side. For version 1.6.4 I have changed the behaviour
104    to match more closely what most people seem to expect of this option */
105 void delete_files(struct file_list *flist)
106 {
107         struct file_list *local_file_list;
108         int i, j;
109         char *name;
110         extern int module_id;
111         extern int ignore_errors;
112         extern int max_delete;
113         static int deletion_count;
114
115         if (cvs_exclude)
116                 add_cvs_excludes();
117
118         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
119                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
120                 return;
121         }
122
123         for (j=0;j<flist->count;j++) {
124                 if (!S_ISDIR(flist->files[j]->mode) || 
125                     !(flist->files[j]->flags & FLAG_DELETE)) continue;
126
127                 if (remote_version < 19 &&
128                     delete_already_done(flist, j)) continue;
129
130                 name = strdup(f_name(flist->files[j]));
131
132                 if (!(local_file_list = send_file_list(-1,1,&name))) {
133                         free(name);
134                         continue;
135                 }
136
137                 if (verbose > 1)
138                         rprintf(FINFO,"deleting in %s\n", name);
139
140                 for (i=local_file_list->count-1;i>=0;i--) {
141                         if (max_delete && deletion_count > max_delete) break;
142                         if (!local_file_list->files[i]->basename) continue;
143                         if (remote_version < 19 &&
144                             S_ISDIR(local_file_list->files[i]->mode))
145                                 add_delete_entry(local_file_list->files[i]);
146                         if (-1 == flist_find(flist,local_file_list->files[i])) {
147                                 char *f = f_name(local_file_list->files[i]);
148                                 int k = strlen(f) - strlen(backup_suffix);
149 /* Hi Andrew, do we really need to play with backup_suffix here? */
150                                 if (make_backups && ((k <= 0) ||
151                                             (strcmp(f+k,backup_suffix) != 0))) {
152                                         (void) make_backup(f);
153                                 } else {
154                                         deletion_count++;
155                                         delete_one(local_file_list->files[i]);
156                                 }
157                         }
158                 }
159                 flist_free(local_file_list);
160                 free(name);
161         }
162 }
163
164
165 static int get_tmpname(char *fnametmp, char *fname)
166 {
167         char *f;
168
169         /* open tmp file */
170         if (tmpdir) {
171                 f = strrchr(fname,'/');
172                 if (f == NULL) 
173                         f = fname;
174                 else 
175                         f++;
176                 if (strlen(tmpdir)+strlen(f)+10 > MAXPATHLEN) {
177                         rprintf(FERROR,"filename too long\n");
178                         return 0;
179                 }
180                 slprintf(fnametmp,MAXPATHLEN, "%s/.%s.XXXXXX",tmpdir,f);
181                 return 1;
182         } 
183
184         f = strrchr(fname,'/');
185
186         if (strlen(fname)+9 > MAXPATHLEN) {
187                 rprintf(FERROR,"filename too long\n");
188                 return 0;
189         }
190
191         if (f) {
192                 *f = 0;
193                 slprintf(fnametmp,MAXPATHLEN,"%s/.%s.XXXXXX",
194                          fname,f+1);
195                 *f = '/';
196         } else {
197                 slprintf(fnametmp,MAXPATHLEN,".%s.XXXXXX",fname);
198         }
199
200         return 1;
201 }
202
203
204 static int receive_data(int f_in,struct map_struct *buf,int fd,char *fname,
205                         OFF_T total_size)
206 {
207         int i,n,remainder,len,count;
208         OFF_T offset = 0;
209         OFF_T offset2;
210         char *data;
211         static char file_sum1[MD4_SUM_LENGTH];
212         static char file_sum2[MD4_SUM_LENGTH];
213         char *map=NULL;
214         
215         count = read_int(f_in);
216         n = read_int(f_in);
217         remainder = read_int(f_in);
218         
219         sum_init();
220         
221         for (i=recv_token(f_in,&data); i != 0; i=recv_token(f_in,&data)) {
222
223                 show_progress(offset, total_size);
224
225                 if (i > 0) {
226                         extern int cleanup_got_literal;
227
228                         if (verbose > 3) {
229                                 rprintf(FINFO,"data recv %d at %.0f\n",
230                                         i,(double)offset);
231                         }
232
233                         stats.literal_data += i;
234                         cleanup_got_literal = 1;
235       
236                         sum_update(data,i);
237
238                         if (fd != -1 && write_file(fd,data,i) != i) {
239                                 rprintf(FERROR,"write failed on %s : %s\n",fname,strerror(errno));
240                                 exit_cleanup(RERR_FILEIO);
241                         }
242                         offset += i;
243                         continue;
244                 } 
245
246                 i = -(i+1);
247                 offset2 = i*(OFF_T)n;
248                 len = n;
249                 if (i == count-1 && remainder != 0)
250                         len = remainder;
251                 
252                 stats.matched_data += len;
253                 
254                 if (verbose > 3)
255                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
256                                 i,len,(double)offset2,(double)offset);
257                 
258                 if (buf) {
259                         map = map_ptr(buf,offset2,len);
260                 
261                         see_token(map, len);
262                         sum_update(map,len);
263                 }
264                 
265                 if (fd != -1 && write_file(fd,map,len) != len) {
266                         rprintf(FERROR,"write failed on %s : %s\n",
267                                 fname,strerror(errno));
268                         exit_cleanup(RERR_FILEIO);
269                 }
270                 offset += len;
271         }
272
273         end_progress(total_size);
274
275         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
276                 rprintf(FERROR,"write failed on %s : %s\n",
277                         fname,strerror(errno));
278                 exit_cleanup(RERR_FILEIO);
279         }
280
281         sum_end(file_sum1);
282
283         if (remote_version >= 14) {
284                 read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
285                 if (verbose > 2) {
286                         rprintf(FINFO,"got file_sum\n");
287                 }
288                 if (fd != -1 && 
289                     memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
290                         return 0;
291                 }
292         }
293         return 1;
294 }
295
296
297 /* main routine for receiver process. Receiver process runs on the
298         same host as the generator process. */
299
300 int recv_files(int f_in,struct file_list *flist,char *local_name,int f_gen)
301 {  
302         int fd1,fd2;
303         STRUCT_STAT st;
304         char *fname;
305         char fnametmp[MAXPATHLEN];
306         char *fnamecmp;
307         char fnamecmpbuf[MAXPATHLEN];
308         struct map_struct *buf;
309         int i;
310         struct file_struct *file;
311         int phase=0;
312         int recv_ok;
313         extern struct stats stats;              
314         extern int preserve_perms;
315         extern int delete_after;
316         struct stats initial_stats;
317
318         if (verbose > 2) {
319                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
320         }
321
322         while (1) {      
323                 cleanup_disable();
324
325                 i = read_int(f_in);
326                 if (i == -1) {
327                         if (phase==0 && remote_version >= 13) {
328                                 phase++;
329                                 csum_length = SUM_LENGTH;
330                                 if (verbose > 2)
331                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
332                                 write_int(f_gen,-1);
333                                 continue;
334                         }
335                         break;
336                 }
337
338                 if (i < 0 || i >= flist->count) {
339                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n", 
340                                 i, flist->count);
341                         exit_cleanup(RERR_PROTOCOL);
342                 }
343
344                 file = flist->files[i];
345                 fname = f_name(file);
346
347                 stats.num_transferred_files++;
348                 stats.total_transferred_size += file->length;
349
350                 if (local_name)
351                         fname = local_name;
352
353                 if (dry_run) {
354                         if (!am_server) {
355                                 log_transfer(file, fname);
356                         }
357                         continue;
358                 }
359
360                 initial_stats = stats;
361
362                 if (verbose > 2)
363                         rprintf(FINFO,"recv_files(%s)\n",fname);
364
365                 fnamecmp = fname;
366
367                 /* open the file */  
368                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
369
370                 if ((fd1 == -1) && (compare_dest != NULL)) {
371                         /* try the file at compare_dest instead */
372                         slprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",
373                                                 compare_dest,fname);
374                         fnamecmp = fnamecmpbuf;
375                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
376                 }
377
378                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
379                         rprintf(FERROR,"fstat %s : %s\n",fnamecmp,strerror(errno));
380                         receive_data(f_in,NULL,-1,NULL,file->length);
381                         close(fd1);
382                         continue;
383                 }
384
385                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
386                         rprintf(FERROR,"%s : not a regular file (recv_files)\n",fnamecmp);
387                         receive_data(f_in,NULL,-1,NULL,file->length);
388                         close(fd1);
389                         continue;
390                 }
391
392                 if (fd1 != -1 && !preserve_perms) {
393                         /* if the file exists already and we aren't perserving
394                            presmissions then act as though the remote end sent
395                            us the file permissions we already have */
396                         file->mode = st.st_mode;
397                 }
398
399                 if (fd1 != -1 && st.st_size > 0) {
400                         buf = map_file(fd1,st.st_size);
401                         if (verbose > 2)
402                                 rprintf(FINFO,"recv mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
403                 } else {
404                         buf = NULL;
405                 }
406
407                 if (!get_tmpname(fnametmp,fname)) {
408                         if (buf) unmap_file(buf);
409                         if (fd1 != -1) close(fd1);
410                         continue;
411                 }
412
413                 /* mktemp is deliberately used here instead of mkstemp.
414                    because O_EXCL is used on the open, the race condition
415                    is not a problem or a security hole, and we want to
416                    control the access permissions on the created file. */
417                 if (NULL == do_mktemp(fnametmp)) {
418                         rprintf(FERROR,"mktemp %s failed\n",fnametmp);
419                         receive_data(f_in,buf,-1,NULL,file->length);
420                         if (buf) unmap_file(buf);
421                         if (fd1 != -1) close(fd1);
422                         continue;
423                 }
424
425                 /* we initially set the perms without the
426                    setuid/setgid bits to ensure that there is no race
427                    condition. They are then correctly updated after
428                    the lchown. Thanks to snabb@epipe.fi for pointing
429                    this out.  We also set it initially without group
430                    access because of a similar race condition. */
431                 fd2 = do_open(fnametmp,O_WRONLY|O_CREAT|O_EXCL,
432                               file->mode & INITACCESSPERMS);
433
434                 /* in most cases parent directories will already exist
435                    because their information should have been previously
436                    transferred, but that may not be the case with -R */
437                 if (fd2 == -1 && relative_paths && errno == ENOENT && 
438                     create_directory_path(fnametmp) == 0) {
439                         fd2 = do_open(fnametmp,O_WRONLY|O_CREAT|O_EXCL,
440                                       file->mode & INITACCESSPERMS);
441                 }
442                 if (fd2 == -1) {
443                         rprintf(FERROR,"cannot create %s : %s\n",fnametmp,strerror(errno));
444                         receive_data(f_in,buf,-1,NULL,file->length);
445                         if (buf) unmap_file(buf);
446                         if (fd1 != -1) close(fd1);
447                         continue;
448                 }
449       
450                 cleanup_set(fnametmp, fname, file, buf, fd1, fd2);
451
452                 if (!am_server) {
453                         log_transfer(file, fname);
454                 }
455
456                 /* recv file data */
457                 recv_ok = receive_data(f_in,buf,fd2,fname,file->length);
458
459                 log_recv(file, &initial_stats);
460                 
461                 if (buf) unmap_file(buf);
462                 if (fd1 != -1) {
463                         close(fd1);
464                 }
465                 close(fd2);
466                 
467                 if (verbose > 2)
468                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
469
470                 finish_transfer(fname, fnametmp, file);
471
472                 cleanup_disable();
473
474                 if (!recv_ok) {
475                         if (csum_length == SUM_LENGTH) {
476                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
477                                         fname);
478                         } else {
479                                 if (verbose > 1)
480                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
481                                 write_int(f_gen,i);
482                         }
483                 }
484         }
485
486         if (delete_after) {
487                 if (recurse && delete_mode && !local_name && flist->count>0) {
488                         delete_files(flist);
489                 }
490         }
491
492         if (preserve_hard_links)
493                 do_hard_links(flist);
494
495         /* now we need to fix any directory permissions that were 
496            modified during the transfer */
497         for (i = 0; i < flist->count; i++) {
498                 file = flist->files[i];
499                 if (!file->basename || !S_ISDIR(file->mode)) continue;
500                 recv_generator(local_name?local_name:f_name(file),flist,i,-1);
501         }
502
503         if (verbose > 2)
504                 rprintf(FINFO,"recv_files finished\n");
505         
506         return 0;
507 }
508