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[rsync.git] / receiver.c
1 /* -*- c-file-style: "linux" -*-
2    
3    Copyright (C) 1996-2000 by Andrew Tridgell
4    Copyright (C) Paul Mackerras 1996
5    
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.
10    
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.
15    
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.
19 */
20
21 #include "rsync.h"
22
23 extern int verbose;
24 extern int recurse;
25 extern int delete_mode;
26 extern int remote_version;
27 extern int csum_length;
28 extern struct stats stats;
29 extern int dry_run;
30 extern int am_server;
31 extern int relative_paths;
32 extern int preserve_hard_links;
33 extern int cvs_exclude;
34 extern int io_error;
35 extern char *tmpdir;
36 extern char *compare_dest;
37 extern int make_backups;
38 extern char *backup_suffix;
39
40 static struct delete_list {
41         dev_t dev;
42         INO_T inode;
43 } *delete_list;
44 static int dlist_len, dlist_alloc_len;
45
46 /* yuck! This function wouldn't have been necessary if I had the sorting
47    algorithm right. Unfortunately fixing the sorting algorithm would introduce
48    a backward incompatibility as file list indexes are sent over the link.
49 */
50 static int delete_already_done(struct file_list *flist,int j)
51 {
52         int i;
53         STRUCT_STAT st;
54
55         if (link_stat(f_name(flist->files[j]), &st)) return 1;
56
57         for (i=0;i<dlist_len;i++) {
58                 if (st.st_ino == delete_list[i].inode &&
59                     st.st_dev == delete_list[i].dev)
60                         return 1;
61         }
62
63         return 0;
64 }
65
66 static void add_delete_entry(struct file_struct *file)
67 {
68         if (dlist_len == dlist_alloc_len) {
69                 dlist_alloc_len += 1024;
70                 delete_list = (struct delete_list *)Realloc(delete_list, sizeof(delete_list[0])*dlist_alloc_len);
71                 if (!delete_list) out_of_memory("add_delete_entry");
72         }
73
74         delete_list[dlist_len].dev = file->dev;
75         delete_list[dlist_len].inode = file->inode;
76         dlist_len++;
77
78         if (verbose > 3)
79                 rprintf(FINFO,"added %s to delete list\n", f_name(file));
80 }
81
82 static void delete_one(struct file_struct *f)
83 {
84         if (!S_ISDIR(f->mode)) {
85                 if (robust_unlink(f_name(f)) != 0) {
86                         rprintf(FERROR,"delete_one: unlink %s: %s\n",f_name(f),strerror(errno));
87                 } else if (verbose) {
88                         rprintf(FINFO,"deleting %s\n",f_name(f));
89                 }
90         } else {    
91                 if (do_rmdir(f_name(f)) != 0) {
92                         if (errno != ENOTEMPTY && errno != EEXIST)
93                                 rprintf(FERROR,"delete_one: rmdir %s: %s\n",
94                                         f_name(f), strerror(errno));
95                 } else if (verbose) {
96                         rprintf(FINFO,"deleting directory %s\n",f_name(f));      
97                 }
98         }
99 }
100
101
102
103
104 /* this deletes any files on the receiving side that are not present
105    on the sending side. For version 1.6.4 I have changed the behaviour
106    to match more closely what most people seem to expect of this option */
107 void delete_files(struct file_list *flist)
108 {
109         struct file_list *local_file_list;
110         int i, j;
111         char *name;
112         extern int module_id;
113         extern int ignore_errors;
114         extern int max_delete;
115         static int deletion_count;
116
117         if (cvs_exclude)
118                 add_cvs_excludes();
119
120         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
121                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
122                 return;
123         }
124
125         for (j=0;j<flist->count;j++) {
126                 if (!S_ISDIR(flist->files[j]->mode) || 
127                     !(flist->files[j]->flags & FLAG_DELETE)) continue;
128
129                 if (remote_version < 19 &&
130                     delete_already_done(flist, j)) continue;
131
132                 name = strdup(f_name(flist->files[j]));
133
134                 if (!(local_file_list = send_file_list(-1,1,&name))) {
135                         free(name);
136                         continue;
137                 }
138
139                 if (verbose > 1)
140                         rprintf(FINFO,"deleting in %s\n", name);
141
142                 for (i=local_file_list->count-1;i>=0;i--) {
143                         if (max_delete && deletion_count > max_delete) break;
144                         if (!local_file_list->files[i]->basename) continue;
145                         if (remote_version < 19 &&
146                             S_ISDIR(local_file_list->files[i]->mode))
147                                 add_delete_entry(local_file_list->files[i]);
148                         if (-1 == flist_find(flist,local_file_list->files[i])) {
149                                 char *f = f_name(local_file_list->files[i]);
150                                 int k = strlen(f) - strlen(backup_suffix);
151 /* Hi Andrew, do we really need to play with backup_suffix here? */
152                                 if (make_backups && ((k <= 0) ||
153                                             (strcmp(f+k,backup_suffix) != 0))) {
154                                         (void) make_backup(f);
155                                 } else {
156                                         deletion_count++;
157                                         delete_one(local_file_list->files[i]);
158                                 }
159                         }
160                 }
161                 flist_free(local_file_list);
162                 free(name);
163         }
164 }
165
166
167 static int get_tmpname(char *fnametmp, char *fname)
168 {
169         char *f;
170
171         /* open tmp file */
172         if (tmpdir) {
173                 f = strrchr(fname,'/');
174                 if (f == NULL) 
175                         f = fname;
176                 else 
177                         f++;
178                 if (strlen(tmpdir)+strlen(f)+10 > MAXPATHLEN) {
179                         rprintf(FERROR,"filename too long\n");
180                         return 0;
181                 }
182                 snprintf(fnametmp,MAXPATHLEN, "%s/.%s.XXXXXX",tmpdir,f);
183                 return 1;
184         } 
185
186         f = strrchr(fname,'/');
187
188         if (strlen(fname)+9 > MAXPATHLEN) {
189                 rprintf(FERROR,"filename too long\n");
190                 return 0;
191         }
192
193         if (f) {
194                 *f = 0;
195                 snprintf(fnametmp,MAXPATHLEN,"%s/.%s.XXXXXX",
196                          fname,f+1);
197                 *f = '/';
198         } else {
199                 snprintf(fnametmp,MAXPATHLEN,".%s.XXXXXX",fname);
200         }
201
202         return 1;
203 }
204
205
206 static int receive_data(int f_in,struct map_struct *buf,int fd,char *fname,
207                         OFF_T total_size)
208 {
209         int i,n,remainder,len,count;
210         OFF_T offset = 0;
211         OFF_T offset2;
212         char *data;
213         static char file_sum1[MD4_SUM_LENGTH];
214         static char file_sum2[MD4_SUM_LENGTH];
215         char *map=NULL;
216         
217         count = read_int(f_in);
218         n = read_int(f_in);
219         remainder = read_int(f_in);
220         
221         sum_init();
222         
223         for (i=recv_token(f_in,&data); i != 0; i=recv_token(f_in,&data)) {
224
225                 show_progress(offset, total_size);
226
227                 if (i > 0) {
228                         extern int cleanup_got_literal;
229
230                         if (verbose > 3) {
231                                 rprintf(FINFO,"data recv %d at %.0f\n",
232                                         i,(double)offset);
233                         }
234
235                         stats.literal_data += i;
236                         cleanup_got_literal = 1;
237       
238                         sum_update(data,i);
239
240                         if (fd != -1 && write_file(fd,data,i) != i) {
241                                 rprintf(FERROR,"write failed on %s : %s\n",fname,strerror(errno));
242                                 exit_cleanup(RERR_FILEIO);
243                         }
244                         offset += i;
245                         continue;
246                 } 
247
248                 i = -(i+1);
249                 offset2 = i*(OFF_T)n;
250                 len = n;
251                 if (i == count-1 && remainder != 0)
252                         len = remainder;
253                 
254                 stats.matched_data += len;
255                 
256                 if (verbose > 3)
257                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
258                                 i,len,(double)offset2,(double)offset);
259                 
260                 if (buf) {
261                         map = map_ptr(buf,offset2,len);
262                 
263                         see_token(map, len);
264                         sum_update(map,len);
265                 }
266                 
267                 if (fd != -1 && write_file(fd,map,len) != len) {
268                         rprintf(FERROR,"write failed on %s : %s\n",
269                                 fname,strerror(errno));
270                         exit_cleanup(RERR_FILEIO);
271                 }
272                 offset += len;
273         }
274
275         end_progress(total_size);
276
277         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
278                 rprintf(FERROR,"write failed on %s : %s\n",
279                         fname,strerror(errno));
280                 exit_cleanup(RERR_FILEIO);
281         }
282
283         sum_end(file_sum1);
284
285         if (remote_version >= 14) {
286                 read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
287                 if (verbose > 2) {
288                         rprintf(FINFO,"got file_sum\n");
289                 }
290                 if (fd != -1 && 
291                     memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
292                         return 0;
293                 }
294         }
295         return 1;
296 }
297
298
299 /* main routine for receiver process. Receiver process runs on the
300         same host as the generator process. */
301
302 int recv_files(int f_in,struct file_list *flist,char *local_name,int f_gen)
303 {  
304         int fd1,fd2;
305         STRUCT_STAT st;
306         char *fname;
307         char template[MAXPATHLEN];
308         char fnametmp[MAXPATHLEN];
309         char *fnamecmp;
310         char fnamecmpbuf[MAXPATHLEN];
311         struct map_struct *buf;
312         int i;
313         struct file_struct *file;
314         int phase=0;
315         int recv_ok;
316         extern struct stats stats;              
317         extern int preserve_perms;
318         extern int delete_after;
319         struct stats initial_stats;
320
321         if (verbose > 2) {
322                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
323         }
324
325         while (1) {      
326                 cleanup_disable();
327
328                 i = read_int(f_in);
329                 if (i == -1) {
330                         if (phase==0 && remote_version >= 13) {
331                                 phase++;
332                                 csum_length = SUM_LENGTH;
333                                 if (verbose > 2)
334                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
335                                 write_int(f_gen,-1);
336                                 continue;
337                         }
338                         break;
339                 }
340
341                 if (i < 0 || i >= flist->count) {
342                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n", 
343                                 i, flist->count);
344                         exit_cleanup(RERR_PROTOCOL);
345                 }
346
347                 file = flist->files[i];
348                 fname = f_name(file);
349
350                 stats.num_transferred_files++;
351                 stats.total_transferred_size += file->length;
352
353                 if (local_name)
354                         fname = local_name;
355
356                 if (dry_run) {
357                         if (!am_server) {
358                                 log_transfer(file, fname);
359                         }
360                         continue;
361                 }
362
363                 initial_stats = stats;
364
365                 if (verbose > 2)
366                         rprintf(FINFO,"recv_files(%s)\n",fname);
367
368                 fnamecmp = fname;
369
370                 /* open the file */  
371                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
372
373                 if ((fd1 == -1) && (compare_dest != NULL)) {
374                         /* try the file at compare_dest instead */
375                         snprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",
376                                                 compare_dest,fname);
377                         fnamecmp = fnamecmpbuf;
378                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
379                 }
380
381                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
382                         rprintf(FERROR,"fstat %s : %s\n",fnamecmp,strerror(errno));
383                         receive_data(f_in,NULL,-1,NULL,file->length);
384                         close(fd1);
385                         continue;
386                 }
387
388                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
389                         rprintf(FERROR,"%s : not a regular file (recv_files)\n",fnamecmp);
390                         receive_data(f_in,NULL,-1,NULL,file->length);
391                         close(fd1);
392                         continue;
393                 }
394
395                 if (fd1 != -1 && !preserve_perms) {
396                         /* if the file exists already and we aren't perserving
397                            presmissions then act as though the remote end sent
398                            us the file permissions we already have */
399                         file->mode = st.st_mode;
400                 }
401
402                 if (fd1 != -1 && st.st_size > 0) {
403                         buf = map_file(fd1,st.st_size);
404                         if (verbose > 2)
405                                 rprintf(FINFO,"recv mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
406                 } else {
407                         buf = NULL;
408                 }
409
410                 if (!get_tmpname(fnametmp,fname)) {
411                         if (buf) unmap_file(buf);
412                         if (fd1 != -1) close(fd1);
413                         continue;
414                 }
415
416                 strlcpy(template, fnametmp, sizeof(template));
417
418                 /* we initially set the perms without the
419                    setuid/setgid bits to ensure that there is no race
420                    condition. They are then correctly updated after
421                    the lchown. Thanks to snabb@epipe.fi for pointing
422                    this out.  We also set it initially without group
423                    access because of a similar race condition. */
424                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
425                 if (fd2 == -1) {
426                         rprintf(FERROR,"mkstemp %s failed\n",fnametmp);
427                         receive_data(f_in,buf,-1,NULL,file->length);
428                         if (buf) unmap_file(buf);
429                         continue;
430                 }
431
432                 /* in most cases parent directories will already exist
433                    because their information should have been previously
434                    transferred, but that may not be the case with -R */
435                 if (fd2 == -1 && relative_paths && errno == ENOENT && 
436                     create_directory_path(fnametmp) == 0) {
437                         strlcpy(fnametmp, template, sizeof(fnametmp));
438                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
439                 }
440                 if (fd2 == -1) {
441                         rprintf(FERROR,"cannot create %s : %s\n",fnametmp,strerror(errno));
442                         receive_data(f_in,buf,-1,NULL,file->length);
443                         if (buf) unmap_file(buf);
444                         if (fd1 != -1) close(fd1);
445                         continue;
446                 }
447       
448                 cleanup_set(fnametmp, fname, file, buf, fd1, fd2);
449
450                 if (!am_server) {
451                         log_transfer(file, fname);
452                 }
453
454                 /* recv file data */
455                 recv_ok = receive_data(f_in,buf,fd2,fname,file->length);
456
457                 log_recv(file, &initial_stats);
458                 
459                 if (buf) unmap_file(buf);
460                 if (fd1 != -1) {
461                         close(fd1);
462                 }
463                 close(fd2);
464                 
465                 if (verbose > 2)
466                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
467
468                 finish_transfer(fname, fnametmp, file);
469
470                 cleanup_disable();
471
472                 if (!recv_ok) {
473                         if (csum_length == SUM_LENGTH) {
474                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
475                                         fname);
476                         } else {
477                                 if (verbose > 1)
478                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
479                                 write_int(f_gen,i);
480                         }
481                 }
482         }
483
484         if (delete_after) {
485                 if (recurse && delete_mode && !local_name && flist->count>0) {
486                         delete_files(flist);
487                 }
488         }
489
490         if (preserve_hard_links)
491                 do_hard_links(flist);
492
493         /* now we need to fix any directory permissions that were 
494            modified during the transfer */
495         for (i = 0; i < flist->count; i++) {
496                 file = flist->files[i];
497                 if (!file->basename || !S_ISDIR(file->mode)) continue;
498                 recv_generator(local_name?local_name:f_name(file),flist,i,-1);
499         }
500
501         if (verbose > 2)
502                 rprintf(FINFO,"recv_files finished\n");
503         
504         return 0;
505 }
506