- Since send_file_list() is no longer called with f == -1, got rid
[rsync.git] / flist.c
1 /*
2    Copyright (C) Andrew Tridgell 1996
3    Copyright (C) Paul Mackerras 1996
4    Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
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 /** @file flist.c
22  * Generate and receive file lists
23  *
24  * @sa http://lists.samba.org/pipermail/rsync/2000-June/002351.html
25  *
26  **/
27
28 #include "rsync.h"
29
30 extern struct stats stats;
31
32 extern int verbose;
33 extern int do_progress;
34 extern int am_root;
35 extern int am_server;
36 extern int am_daemon;
37 extern int am_sender;
38 extern int always_checksum;
39 extern int module_id;
40 extern int ignore_errors;
41 extern int numeric_ids;
42
43 extern int recurse;
44 extern int xfer_dirs;
45 extern char curr_dir[MAXPATHLEN];
46 extern unsigned int curr_dir_len;
47 extern char *backup_dir;
48 extern char *backup_suffix;
49 extern int filesfrom_fd;
50
51 extern int one_file_system;
52 extern int keep_dirlinks;
53 extern int preserve_links;
54 extern int preserve_hard_links;
55 extern int preserve_perms;
56 extern int preserve_devices;
57 extern int preserve_uid;
58 extern int preserve_gid;
59 extern int relative_paths;
60 extern int implied_dirs;
61 extern int make_backups;
62 extern int backup_suffix_len;
63 extern int copy_links;
64 extern int copy_unsafe_links;
65 extern int protocol_version;
66 extern int sanitize_paths;
67 extern int delete_excluded;
68 extern int max_delete;
69 extern int orig_umask;
70 extern int list_only;
71
72 extern struct filter_list_struct filter_list;
73 extern struct filter_list_struct server_filter_list;
74
75 int io_error;
76
77 static char empty_sum[MD4_SUM_LENGTH];
78 static unsigned int file_struct_len;
79 static struct file_list *received_flist;
80 static dev_t filesystem_dev; /* used to implement -x */
81 static int deletion_count = 0; /* used to implement --max-delete */
82
83 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
84 static void output_flist(struct file_list *flist, const char *whose_list);
85
86 void init_flist(void)
87 {
88         struct file_struct f;
89
90         /* Figure out how big the file_struct is without trailing padding */
91         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
92 }
93
94
95 static int show_filelist_p(void)
96 {
97         return verbose && xfer_dirs && !am_server;
98 }
99
100 static void start_filelist_progress(char *kind)
101 {
102         rprintf(FINFO, "%s ... ", kind);
103         if (verbose > 1 || do_progress)
104                 rprintf(FINFO, "\n");
105         rflush(FINFO);
106 }
107
108
109 static void emit_filelist_progress(const struct file_list *flist)
110 {
111         rprintf(FINFO, " %d files...\r", flist->count);
112 }
113
114
115 static void maybe_emit_filelist_progress(const struct file_list *flist)
116 {
117         if (do_progress && show_filelist_p() && (flist->count % 100) == 0)
118                 emit_filelist_progress(flist);
119 }
120
121
122 static void finish_filelist_progress(const struct file_list *flist)
123 {
124         if (do_progress) {
125                 /* This overwrites the progress line */
126                 rprintf(FINFO, "%d file%sto consider\n",
127                         flist->count, flist->count == 1 ? " " : "s ");
128         } else
129                 rprintf(FINFO, "done\n");
130 }
131
132 void show_flist_stats(void)
133 {
134         /* Nothing yet */
135 }
136
137
138 static void list_file_entry(struct file_struct *f)
139 {
140         char perms[11];
141
142         if (!f->basename) {
143                 /* this can happen if duplicate names were removed */
144                 return;
145         }
146
147         permstring(perms, f->mode);
148
149 #if SUPPORT_LINKS
150         if (preserve_links && S_ISLNK(f->mode)) {
151                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
152                         perms,
153                         (double)f->length, timestring(f->modtime),
154                         safe_fname(f_name(f)), safe_fname(f->u.link));
155         } else
156 #endif
157         {
158                 rprintf(FINFO, "%s %11.0f %s %s\n",
159                         perms,
160                         (double)f->length, timestring(f->modtime),
161                         safe_fname(f_name(f)));
162         }
163 }
164
165
166 /**
167  * Stat either a symlink or its referent, depending on the settings of
168  * copy_links, copy_unsafe_links, etc.
169  *
170  * @retval -1 on error
171  *
172  * @retval 0 for success
173  *
174  * @post If @p path is a symlink, then @p linkbuf (of size @c
175  * MAXPATHLEN) contains the symlink target.
176  *
177  * @post @p buffer contains information about the link or the
178  * referrent as appropriate, if they exist.
179  **/
180 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
181 {
182 #if SUPPORT_LINKS
183         if (copy_links)
184                 return do_stat(path, buffer);
185         if (link_stat(path, buffer, 0) < 0)
186                 return -1;
187         if (S_ISLNK(buffer->st_mode)) {
188                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
189                 if (l == -1)
190                         return -1;
191                 linkbuf[l] = 0;
192                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
193                         if (verbose > 1) {
194                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
195                                         safe_fname(path), safe_fname(linkbuf));
196                         }
197                         return do_stat(path, buffer);
198                 }
199         }
200         return 0;
201 #else
202         return do_stat(path, buffer);
203 #endif
204 }
205
206 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
207 {
208 #if SUPPORT_LINKS
209         if (copy_links)
210                 return do_stat(path, buffer);
211         if (do_lstat(path, buffer) < 0)
212                 return -1;
213         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
214                 STRUCT_STAT st;
215                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
216                         *buffer = st;
217         }
218         return 0;
219 #else
220         return do_stat(path, buffer);
221 #endif
222 }
223
224 /* This function is used to check if a file should be included/excluded
225  * from the list of files based on its name and type etc.  The value of
226  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
227 static int is_excluded(char *fname, int is_dir, int filter_level)
228 {
229 #if 0 /* This currently never happens, so avoid a useless compare. */
230         if (filter_level == NO_FILTERS)
231                 return 0;
232 #endif
233         if (fname) {
234                 /* never exclude '.', even if somebody does --exclude '*' */
235                 if (fname[0] == '.' && !fname[1])
236                         return 0;
237                 /* Handle the -R version of the '.' dir. */
238                 if (fname[0] == '/') {
239                         int len = strlen(fname);
240                         if (fname[len-1] == '.' && fname[len-2] == '/')
241                                 return 0;
242                 }
243         }
244         if (server_filter_list.head
245             && check_filter(&server_filter_list, fname, is_dir) < 0)
246                 return 1;
247         if (filter_level != ALL_FILTERS)
248                 return 0;
249         if (filter_list.head
250             && check_filter(&filter_list, fname, is_dir) < 0)
251                 return 1;
252         return 0;
253 }
254
255 static int to_wire_mode(mode_t mode)
256 {
257 #if SUPPORT_LINKS
258         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
259                 return (mode & ~(_S_IFMT)) | 0120000;
260 #endif
261         return (int)mode;
262 }
263
264 static mode_t from_wire_mode(int mode)
265 {
266         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
267                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
268         return (mode_t)mode;
269 }
270
271
272 static void send_directory(int f, struct file_list *flist,
273                            char *fbuf, unsigned int offset);
274
275 static char *flist_dir;
276 static int flist_dir_len;
277
278
279 /**
280  * Make sure @p flist is big enough to hold at least @p flist->count
281  * entries.
282  **/
283 void flist_expand(struct file_list *flist)
284 {
285         struct file_struct **new_ptr;
286
287         if (flist->count < flist->malloced)
288                 return;
289
290         if (flist->malloced < FLIST_START)
291                 flist->malloced = FLIST_START;
292         else if (flist->malloced >= FLIST_LINEAR)
293                 flist->malloced += FLIST_LINEAR;
294         else
295                 flist->malloced *= 2;
296
297         /*
298          * In case count jumped or we are starting the list
299          * with a known size just set it.
300          */
301         if (flist->malloced < flist->count)
302                 flist->malloced = flist->count;
303
304         new_ptr = realloc_array(flist->files, struct file_struct *,
305                                 flist->malloced);
306
307         if (verbose >= 2 && flist->malloced != FLIST_START) {
308                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
309                     who_am_i(),
310                     (double)sizeof flist->files[0] * flist->malloced,
311                     (new_ptr == flist->files) ? " not" : "");
312         }
313
314         flist->files = new_ptr;
315
316         if (!flist->files)
317                 out_of_memory("flist_expand");
318 }
319
320 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
321 {
322         unsigned short flags;
323         static time_t modtime;
324         static mode_t mode;
325         static int64 dev;
326         static dev_t rdev;
327         static uint32 rdev_major;
328         static uid_t uid;
329         static gid_t gid;
330         static char lastname[MAXPATHLEN];
331         char fname[MAXPATHLEN];
332         int l1, l2;
333
334         if (f == -1)
335                 return;
336
337         if (!file) {
338                 write_byte(f, 0);
339                 modtime = 0, mode = 0;
340                 dev = 0, rdev = makedev(0, 0);
341                 rdev_major = 0;
342                 uid = 0, gid = 0;
343                 *lastname = '\0';
344                 return;
345         }
346
347         io_write_phase = "send_file_entry";
348
349         f_name_to(file, fname);
350
351         flags = base_flags;
352
353         if (file->mode == mode)
354                 flags |= XMIT_SAME_MODE;
355         else
356                 mode = file->mode;
357         if (preserve_devices) {
358                 if (protocol_version < 28) {
359                         if (IS_DEVICE(mode)) {
360                                 if (file->u.rdev == rdev)
361                                         flags |= XMIT_SAME_RDEV_pre28;
362                                 else
363                                         rdev = file->u.rdev;
364                         } else
365                                 rdev = makedev(0, 0);
366                 } else if (IS_DEVICE(mode)) {
367                         rdev = file->u.rdev;
368                         if ((uint32)major(rdev) == rdev_major)
369                                 flags |= XMIT_SAME_RDEV_MAJOR;
370                         else
371                                 rdev_major = major(rdev);
372                         if ((uint32)minor(rdev) <= 0xFFu)
373                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
374                 }
375         }
376         if (file->uid == uid)
377                 flags |= XMIT_SAME_UID;
378         else
379                 uid = file->uid;
380         if (file->gid == gid)
381                 flags |= XMIT_SAME_GID;
382         else
383                 gid = file->gid;
384         if (file->modtime == modtime)
385                 flags |= XMIT_SAME_TIME;
386         else
387                 modtime = file->modtime;
388
389 #if SUPPORT_HARD_LINKS
390         if (file->link_u.idev) {
391                 if (file->F_DEV == dev) {
392                         if (protocol_version >= 28)
393                                 flags |= XMIT_SAME_DEV;
394                 } else
395                         dev = file->F_DEV;
396                 flags |= XMIT_HAS_IDEV_DATA;
397         }
398 #endif
399
400         for (l1 = 0;
401             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
402             l1++) {}
403         l2 = strlen(fname+l1);
404
405         if (l1 > 0)
406                 flags |= XMIT_SAME_NAME;
407         if (l2 > 255)
408                 flags |= XMIT_LONG_NAME;
409
410         /* We must make sure we don't send a zero flag byte or the
411          * other end will terminate the flist transfer.  Note that
412          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
413          * it's harmless way to add a bit to the first flag byte. */
414         if (protocol_version >= 28) {
415                 if (!flags && !S_ISDIR(mode))
416                         flags |= XMIT_TOP_DIR;
417                 if ((flags & 0xFF00) || !flags) {
418                         flags |= XMIT_EXTENDED_FLAGS;
419                         write_byte(f, flags);
420                         write_byte(f, flags >> 8);
421                 } else
422                         write_byte(f, flags);
423         } else {
424                 if (!(flags & 0xFF) && !S_ISDIR(mode))
425                         flags |= XMIT_TOP_DIR;
426                 if (!(flags & 0xFF))
427                         flags |= XMIT_LONG_NAME;
428                 write_byte(f, flags);
429         }
430         if (flags & XMIT_SAME_NAME)
431                 write_byte(f, l1);
432         if (flags & XMIT_LONG_NAME)
433                 write_int(f, l2);
434         else
435                 write_byte(f, l2);
436         write_buf(f, fname + l1, l2);
437
438         write_longint(f, file->length);
439         if (!(flags & XMIT_SAME_TIME))
440                 write_int(f, modtime);
441         if (!(flags & XMIT_SAME_MODE))
442                 write_int(f, to_wire_mode(mode));
443         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
444                 if (!numeric_ids)
445                         add_uid(uid);
446                 write_int(f, uid);
447         }
448         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
449                 if (!numeric_ids)
450                         add_gid(gid);
451                 write_int(f, gid);
452         }
453         if (preserve_devices && IS_DEVICE(mode)) {
454                 if (protocol_version < 28) {
455                         if (!(flags & XMIT_SAME_RDEV_pre28))
456                                 write_int(f, (int)rdev);
457                 } else {
458                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
459                                 write_int(f, major(rdev));
460                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
461                                 write_byte(f, minor(rdev));
462                         else
463                                 write_int(f, minor(rdev));
464                 }
465         }
466
467 #if SUPPORT_LINKS
468         if (preserve_links && S_ISLNK(mode)) {
469                 int len = strlen(file->u.link);
470                 write_int(f, len);
471                 write_buf(f, file->u.link, len);
472         }
473 #endif
474
475 #if SUPPORT_HARD_LINKS
476         if (flags & XMIT_HAS_IDEV_DATA) {
477                 if (protocol_version < 26) {
478                         /* 32-bit dev_t and ino_t */
479                         write_int(f, dev);
480                         write_int(f, file->F_INODE);
481                 } else {
482                         /* 64-bit dev_t and ino_t */
483                         if (!(flags & XMIT_SAME_DEV))
484                                 write_longint(f, dev);
485                         write_longint(f, file->F_INODE);
486                 }
487         }
488 #endif
489
490         if (always_checksum) {
491                 char *sum;
492                 if (S_ISREG(mode))
493                         sum = file->u.sum;
494                 else if (protocol_version < 28) {
495                         /* Prior to 28, we sent a useless set of nulls. */
496                         sum = empty_sum;
497                 } else
498                         sum = NULL;
499                 if (sum) {
500                         write_buf(f, sum,
501                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
502                 }
503         }
504
505         strlcpy(lastname, fname, MAXPATHLEN);
506
507         io_write_phase = "unknown";
508 }
509
510
511
512 static void receive_file_entry(struct file_list *flist, int ndx,
513                                unsigned short flags, int f)
514 {
515         static time_t modtime;
516         static mode_t mode;
517         static int64 dev;
518         static dev_t rdev;
519         static uint32 rdev_major;
520         static uid_t uid;
521         static gid_t gid;
522         static char lastname[MAXPATHLEN], *lastdir;
523         static int lastdir_depth, lastdir_len = -1;
524         static unsigned int del_hier_name_len = 0;
525         static int in_del_hier = 0;
526         char thisname[MAXPATHLEN];
527         unsigned int l1 = 0, l2 = 0;
528         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
529         OFF_T file_length;
530         char *basename, *dirname, *bp;
531         struct file_struct *file;
532
533         if (!flist) {
534                 modtime = 0, mode = 0;
535                 dev = 0, rdev = makedev(0, 0);
536                 rdev_major = 0;
537                 uid = 0, gid = 0;
538                 *lastname = '\0';
539                 lastdir_len = -1;
540                 in_del_hier = 0;
541                 return;
542         }
543
544         if (flags & XMIT_SAME_NAME)
545                 l1 = read_byte(f);
546
547         if (flags & XMIT_LONG_NAME)
548                 l2 = read_int(f);
549         else
550                 l2 = read_byte(f);
551
552         if (l2 >= MAXPATHLEN - l1) {
553                 rprintf(FERROR,
554                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
555                         flags, l1, l2, safe_fname(lastname));
556                 overflow("receive_file_entry");
557         }
558
559         strlcpy(thisname, lastname, l1 + 1);
560         read_sbuf(f, &thisname[l1], l2);
561         thisname[l1 + l2] = 0;
562
563         strlcpy(lastname, thisname, MAXPATHLEN);
564
565         clean_fname(thisname, 0);
566
567         if (sanitize_paths)
568                 sanitize_path(thisname, thisname, "", 0);
569
570         if ((basename = strrchr(thisname, '/')) != NULL) {
571                 dirname_len = ++basename - thisname; /* counts future '\0' */
572                 if (lastdir_len == dirname_len - 1
573                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
574                         dirname = lastdir;
575                         dirname_len = 0; /* indicates no copy is needed */
576                 } else
577                         dirname = thisname;
578         } else {
579                 basename = thisname;
580                 dirname = NULL;
581                 dirname_len = 0;
582         }
583         basename_len = strlen(basename) + 1; /* count the '\0' */
584
585         file_length = read_longint(f);
586         if (!(flags & XMIT_SAME_TIME))
587                 modtime = (time_t)read_int(f);
588         if (!(flags & XMIT_SAME_MODE))
589                 mode = from_wire_mode(read_int(f));
590
591         if (preserve_uid && !(flags & XMIT_SAME_UID))
592                 uid = (uid_t)read_int(f);
593         if (preserve_gid && !(flags & XMIT_SAME_GID))
594                 gid = (gid_t)read_int(f);
595
596         if (preserve_devices) {
597                 if (protocol_version < 28) {
598                         if (IS_DEVICE(mode)) {
599                                 if (!(flags & XMIT_SAME_RDEV_pre28))
600                                         rdev = (dev_t)read_int(f);
601                         } else
602                                 rdev = makedev(0, 0);
603                 } else if (IS_DEVICE(mode)) {
604                         uint32 rdev_minor;
605                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
606                                 rdev_major = read_int(f);
607                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
608                                 rdev_minor = read_byte(f);
609                         else
610                                 rdev_minor = read_int(f);
611                         rdev = makedev(rdev_major, rdev_minor);
612                 }
613         }
614
615 #if SUPPORT_LINKS
616         if (preserve_links && S_ISLNK(mode)) {
617                 linkname_len = read_int(f) + 1; /* count the '\0' */
618                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
619                         rprintf(FERROR, "overflow: linkname_len=%d\n",
620                                 linkname_len - 1);
621                         overflow("receive_file_entry");
622                 }
623         }
624         else
625 #endif
626                 linkname_len = 0;
627
628         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
629
630         alloc_len = file_struct_len + dirname_len + basename_len
631                   + linkname_len + sum_len;
632         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
633
634         file = flist->files[ndx] = (struct file_struct *)bp;
635         memset(bp, 0, file_struct_len);
636         bp += file_struct_len;
637
638         file->flags = 0;
639         file->modtime = modtime;
640         file->length = file_length;
641         file->mode = mode;
642         file->uid = uid;
643         file->gid = gid;
644
645         if (dirname_len) {
646                 file->dirname = lastdir = bp;
647                 lastdir_len = dirname_len - 1;
648                 memcpy(bp, dirname, dirname_len - 1);
649                 bp += dirname_len;
650                 bp[-1] = '\0';
651                 lastdir_depth = count_dir_elements(lastdir);
652                 file->dir.depth = lastdir_depth + 1;
653         } else if (dirname) {
654                 file->dirname = dirname; /* we're reusing lastname */
655                 file->dir.depth = lastdir_depth + 1;
656         } else
657                 file->dir.depth = 1;
658
659         if (S_ISDIR(mode)) {
660                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
661                         file->dir.depth--;
662                 if (flags & XMIT_TOP_DIR) {
663                         in_del_hier = 1;
664                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
665                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
666                 } else if (in_del_hier) {
667                         if (!relative_paths || !del_hier_name_len
668                          || (l1 >= del_hier_name_len
669                           && thisname[del_hier_name_len] == '/'))
670                                 file->flags |= FLAG_DEL_HERE;
671                         else
672                                 in_del_hier = 0;
673                 }
674         }
675
676         file->basename = bp;
677         memcpy(bp, basename, basename_len);
678         bp += basename_len;
679
680         if (preserve_devices && IS_DEVICE(mode))
681                 file->u.rdev = rdev;
682
683 #if SUPPORT_LINKS
684         if (linkname_len) {
685                 file->u.link = bp;
686                 read_sbuf(f, bp, linkname_len - 1);
687                 if (sanitize_paths)
688                         sanitize_path(bp, bp, "", lastdir_depth);
689                 bp += linkname_len;
690         }
691 #endif
692
693 #if SUPPORT_HARD_LINKS
694         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
695                 flags |= XMIT_HAS_IDEV_DATA;
696         if (flags & XMIT_HAS_IDEV_DATA) {
697                 int64 inode;
698                 if (protocol_version < 26) {
699                         dev = read_int(f);
700                         inode = read_int(f);
701                 } else {
702                         if (!(flags & XMIT_SAME_DEV))
703                                 dev = read_longint(f);
704                         inode = read_longint(f);
705                 }
706                 if (flist->hlink_pool) {
707                         file->link_u.idev = pool_talloc(flist->hlink_pool,
708                             struct idev, 1, "inode_table");
709                         file->F_INODE = inode;
710                         file->F_DEV = dev;
711                 }
712         }
713 #endif
714
715         if (always_checksum) {
716                 char *sum;
717                 if (sum_len) {
718                         file->u.sum = sum = bp;
719                         /*bp += sum_len;*/
720                 } else if (protocol_version < 28) {
721                         /* Prior to 28, we get a useless set of nulls. */
722                         sum = empty_sum;
723                 } else
724                         sum = NULL;
725                 if (sum) {
726                         read_buf(f, sum,
727                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
728                 }
729         }
730
731         if (!preserve_perms) {
732                 /* set an appropriate set of permissions based on original
733                  * permissions and umask. This emulates what GNU cp does */
734                 file->mode &= ~orig_umask;
735         }
736 }
737
738
739 /**
740  * Create a file_struct for a named file by reading its stat()
741  * information and performing extensive checks against global
742  * options.
743  *
744  * @return the new file, or NULL if there was an error or this file
745  * should be excluded.
746  *
747  * @todo There is a small optimization opportunity here to avoid
748  * stat()ing the file in some circumstances, which has a certain cost.
749  * We are called immediately after doing readdir(), and so we may
750  * already know the d_type of the file.  We could for example avoid
751  * statting directories if we're not recursing, but this is not a very
752  * important case.  Some systems may not have d_type.
753  **/
754 struct file_struct *make_file(char *fname, struct file_list *flist,
755                               int filter_level)
756 {
757         static char *lastdir;
758         static int lastdir_len = -1;
759         struct file_struct *file;
760         STRUCT_STAT st;
761         char sum[SUM_LENGTH];
762         char thisname[MAXPATHLEN];
763         char linkname[MAXPATHLEN];
764         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
765         char *basename, *dirname, *bp;
766         unsigned short flags = 0;
767
768         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
769                 lastdir_len = -1;
770
771         if (strlcpy(thisname, fname, sizeof thisname)
772             >= sizeof thisname - flist_dir_len) {
773                 rprintf(FINFO, "skipping overly long name: %s\n",
774                         safe_fname(fname));
775                 return NULL;
776         }
777         clean_fname(thisname, 0);
778         if (sanitize_paths)
779                 sanitize_path(thisname, thisname, "", 0);
780
781         memset(sum, 0, SUM_LENGTH);
782
783         if (readlink_stat(thisname, &st, linkname) != 0) {
784                 int save_errno = errno;
785                 /* See if file is excluded before reporting an error. */
786                 if (filter_level != NO_FILTERS
787                     && is_excluded(thisname, 0, filter_level))
788                         return NULL;
789                 if (save_errno == ENOENT) {
790 #if SUPPORT_LINKS
791                         /* Avoid "vanished" error if symlink points nowhere. */
792                         if (copy_links && do_lstat(thisname, &st) == 0
793                             && S_ISLNK(st.st_mode)) {
794                                 io_error |= IOERR_GENERAL;
795                                 rprintf(FERROR, "symlink has no referent: %s\n",
796                                         full_fname(thisname));
797                         } else
798 #endif
799                         {
800                                 enum logcode c = am_daemon && protocol_version < 28
801                                     ? FERROR : FINFO;
802                                 io_error |= IOERR_VANISHED;
803                                 rprintf(c, "file has vanished: %s\n",
804                                         full_fname(thisname));
805                         }
806                 } else {
807                         io_error |= IOERR_GENERAL;
808                         rsyserr(FERROR, save_errno, "readlink %s failed",
809                                 full_fname(thisname));
810                 }
811                 return NULL;
812         }
813
814         /* backup.c calls us with filter_level set to NO_FILTERS. */
815         if (filter_level == NO_FILTERS)
816                 goto skip_filters;
817
818         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
819                 rprintf(FINFO, "skipping directory %s\n", safe_fname(thisname));
820                 return NULL;
821         }
822
823         /* We only care about directories because we need to avoid recursing
824          * into a mount-point directory, not to avoid copying a symlinked
825          * file if -L (or similar) was specified. */
826         if (one_file_system && st.st_dev != filesystem_dev
827             && S_ISDIR(st.st_mode))
828                 flags |= FLAG_MOUNT_POINT;
829
830         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
831                 return NULL;
832
833         if (lp_ignore_nonreadable(module_id)) {
834 #if SUPPORT_LINKS
835                 if (!S_ISLNK(st.st_mode))
836 #endif
837                         if (access(thisname, R_OK) != 0)
838                                 return NULL;
839         }
840
841 skip_filters:
842
843         if (verbose > 2) {
844                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
845                         who_am_i(), safe_fname(thisname), filter_level);
846         }
847
848         if ((basename = strrchr(thisname, '/')) != NULL) {
849                 dirname_len = ++basename - thisname; /* counts future '\0' */
850                 if (lastdir_len == dirname_len - 1
851                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
852                         dirname = lastdir;
853                         dirname_len = 0; /* indicates no copy is needed */
854                 } else
855                         dirname = thisname;
856         } else {
857                 basename = thisname;
858                 dirname = NULL;
859                 dirname_len = 0;
860         }
861         basename_len = strlen(basename) + 1; /* count the '\0' */
862
863 #if SUPPORT_LINKS
864         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
865 #else
866         linkname_len = 0;
867 #endif
868
869         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
870
871         alloc_len = file_struct_len + dirname_len + basename_len
872             + linkname_len + sum_len;
873         if (flist) {
874                 bp = pool_alloc(flist->file_pool, alloc_len,
875                     "receive_file_entry");
876         } else {
877                 if (!(bp = new_array(char, alloc_len)))
878                         out_of_memory("receive_file_entry");
879         }
880
881         file = (struct file_struct *)bp;
882         memset(bp, 0, file_struct_len);
883         bp += file_struct_len;
884
885         file->flags = flags;
886         file->modtime = st.st_mtime;
887         file->length = st.st_size;
888         file->mode = st.st_mode;
889         file->uid = st.st_uid;
890         file->gid = st.st_gid;
891
892 #if SUPPORT_HARD_LINKS
893         if (flist && flist->hlink_pool) {
894                 if (protocol_version < 28) {
895                         if (S_ISREG(st.st_mode))
896                                 file->link_u.idev = pool_talloc(
897                                     flist->hlink_pool, struct idev, 1,
898                                     "inode_table");
899                 } else {
900                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
901                                 file->link_u.idev = pool_talloc(
902                                     flist->hlink_pool, struct idev, 1,
903                                     "inode_table");
904                 }
905         }
906         if (file->link_u.idev) {
907                 file->F_DEV = st.st_dev;
908                 file->F_INODE = st.st_ino;
909         }
910 #endif
911
912         if (dirname_len) {
913                 file->dirname = lastdir = bp;
914                 lastdir_len = dirname_len - 1;
915                 memcpy(bp, dirname, dirname_len - 1);
916                 bp += dirname_len;
917                 bp[-1] = '\0';
918         } else if (dirname)
919                 file->dirname = dirname;
920
921         file->basename = bp;
922         memcpy(bp, basename, basename_len);
923         bp += basename_len;
924
925 #if HAVE_STRUCT_STAT_ST_RDEV
926         if (preserve_devices && IS_DEVICE(st.st_mode))
927                 file->u.rdev = st.st_rdev;
928 #endif
929
930 #if SUPPORT_LINKS
931         if (linkname_len) {
932                 file->u.link = bp;
933                 memcpy(bp, linkname, linkname_len);
934                 bp += linkname_len;
935         }
936 #endif
937
938         if (sum_len) {
939                 file->u.sum = bp;
940                 file_checksum(thisname, bp, st.st_size);
941                 /*bp += sum_len;*/
942         }
943
944         file->dir.root = flist_dir;
945
946         /* This code is only used by the receiver when it is building
947          * a list of files for a delete pass. */
948         if (keep_dirlinks && linkname_len && flist) {
949                 STRUCT_STAT st2;
950                 int i = flist_find(received_flist, file);
951                 if (i >= 0 && S_ISDIR(received_flist->files[i]->mode)
952                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
953                         file->modtime = st2.st_mtime;
954                         file->length = st2.st_size;
955                         file->mode = st2.st_mode;
956                         file->uid = st2.st_uid;
957                         file->gid = st2.st_gid;
958                         file->u.link = NULL;
959                         if (file->link_u.idev) {
960                                 pool_free(flist->hlink_pool, 0, file->link_u.idev);
961                                 file->link_u.idev = NULL;
962                         }
963                 }
964         }
965
966         if (!S_ISDIR(st.st_mode))
967                 stats.total_size += st.st_size;
968
969         return file;
970 }
971
972
973 void send_file_name(int f, struct file_list *flist, char *fname,
974                     int recursive, unsigned short base_flags)
975 {
976         struct file_struct *file;
977         char fbuf[MAXPATHLEN];
978
979         /* f is set to -1 when calculating deletion file list */
980         file = make_file(fname, flist,
981             f == -1 && delete_excluded? SERVER_FILTERS : ALL_FILTERS);
982
983         if (!file)
984                 return;
985
986         maybe_emit_filelist_progress(flist);
987
988         flist_expand(flist);
989
990         if (file->basename[0]) {
991                 flist->files[flist->count++] = file;
992                 send_file_entry(file, f, base_flags);
993         }
994
995         if (recursive && S_ISDIR(file->mode)
996             && !(file->flags & FLAG_MOUNT_POINT) && f_name_to(file, fbuf)) {
997                 void *save_filters;
998                 unsigned int len = strlen(fbuf);
999                 if (len > 1 && fbuf[len-1] == '/')
1000                         fbuf[--len] = '\0';
1001                 if (len >= MAXPATHLEN - 1) {
1002                         io_error |= IOERR_GENERAL;
1003                         rprintf(FERROR, "skipping long-named directory: %s\n",
1004                                 full_fname(fbuf));
1005                         return;
1006                 }
1007                 save_filters = push_local_filters(fbuf, len);
1008                 send_directory(f, flist, fbuf, len);
1009                 pop_local_filters(save_filters);
1010         }
1011 }
1012
1013
1014 /* Note that the "recurse" value either contains -1, for infinite recursion,
1015  * or a number >= 0 indicating how many levels of recursion we will allow.
1016  * This function is normally called by the sender, but the receiving side
1017  * also calls it from delete_in_dir() with f set to -1 so that we just
1018  * construct the file list in memory without sending it over the wire. */
1019 static void send_directory(int f, struct file_list *flist,
1020                            char *fbuf, unsigned int len)
1021 {
1022         struct dirent *di;
1023         char *p;
1024         DIR *d;
1025
1026         if (!(d = opendir(fbuf))) {
1027                 io_error |= IOERR_GENERAL;
1028                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1029                 return;
1030         }
1031
1032         p = fbuf + len;
1033         if (len != 1 || *fbuf != '/')
1034                 *p++ = '/';
1035         *p = '\0';
1036
1037         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1038                 char *dname = d_name(di);
1039                 if (dname[0] == '.' && (dname[1] == '\0'
1040                     || (dname[1] == '.' && dname[2] == '\0')))
1041                         continue;
1042                 if (strlcpy(p, dname, MAXPATHLEN - len) < MAXPATHLEN - len) {
1043                         int do_subdirs = recurse >= 1 ? recurse-- : recurse;
1044                         send_file_name(f, flist, fbuf, do_subdirs, 0);
1045                 } else {
1046                         io_error |= IOERR_GENERAL;
1047                         rprintf(FINFO,
1048                                 "cannot send long-named file %s\n",
1049                                 full_fname(fbuf));
1050                 }
1051         }
1052         if (errno) {
1053                 io_error |= IOERR_GENERAL;
1054                 *p = '\0';
1055                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1056         }
1057
1058         closedir(d);
1059 }
1060
1061
1062 struct file_list *send_file_list(int f, int argc, char *argv[])
1063 {
1064         int l;
1065         STRUCT_STAT st;
1066         char *p, *dir, olddir[sizeof curr_dir];
1067         char lastpath[MAXPATHLEN] = "";
1068         struct file_list *flist;
1069         struct timeval start_tv, end_tv;
1070         int64 start_write;
1071         int use_ff_fd = 0;
1072
1073         if (show_filelist_p())
1074                 start_filelist_progress("building file list");
1075
1076         start_write = stats.total_written;
1077         gettimeofday(&start_tv, NULL);
1078
1079         flist = flist_new(WITH_HLINK, "send_file_list");
1080
1081         io_start_buffering_out();
1082         if (filesfrom_fd >= 0) {
1083                 if (argv[0] && !push_dir(argv[0])) {
1084                         rsyserr(FERROR, errno, "push_dir %s failed",
1085                                 full_fname(argv[0]));
1086                         exit_cleanup(RERR_FILESELECT);
1087                 }
1088                 use_ff_fd = 1;
1089         }
1090
1091         while (1) {
1092                 char fname2[MAXPATHLEN];
1093                 char *fname = fname2;
1094                 int do_subdirs;
1095
1096                 if (use_ff_fd) {
1097                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1098                                 break;
1099                         sanitize_path(fname, fname, "", 0);
1100                 } else {
1101                         if (argc-- == 0)
1102                                 break;
1103                         strlcpy(fname, *argv++, MAXPATHLEN);
1104                         if (sanitize_paths)
1105                                 sanitize_path(fname, fname, "", 0);
1106                 }
1107
1108                 l = strlen(fname);
1109                 if (!l || fname[l - 1] == '/') {
1110                         if (l == 2 && fname[0] == '.') {
1111                                 /* Turn "./" into just "." rather than "./." */
1112                                 fname[1] = '\0';
1113                         } else if (l < MAXPATHLEN) {
1114                                 fname[l++] = '.';
1115                                 fname[l] = '\0';
1116                         }
1117                 }
1118                 if (fname[l-1] == '.' && (l == 1 || fname[l-2] == '/')) {
1119                         if (!recurse && xfer_dirs)
1120                                 recurse = 1; /* allow one level */
1121                 } else if (recurse > 0)
1122                         recurse = 0;
1123
1124                 if (link_stat(fname, &st, keep_dirlinks) != 0) {
1125                         io_error |= IOERR_GENERAL;
1126                         rsyserr(FERROR, errno, "link_stat %s failed",
1127                                 full_fname(fname));
1128                         continue;
1129                 }
1130
1131                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1132                         rprintf(FINFO, "skipping directory %s\n",
1133                                 safe_fname(fname));
1134                         continue;
1135                 }
1136
1137                 dir = NULL;
1138                 olddir[0] = '\0';
1139
1140                 if (!relative_paths) {
1141                         p = strrchr(fname, '/');
1142                         if (p) {
1143                                 *p = 0;
1144                                 if (p == fname)
1145                                         dir = "/";
1146                                 else
1147                                         dir = fname;
1148                                 fname = p + 1;
1149                         }
1150                 } else if (implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1151                         /* this ensures we send the intermediate directories,
1152                            thus getting their permissions right */
1153                         char *lp = lastpath, *fn = fname, *slash = fname;
1154                         *p = 0;
1155                         /* Skip any initial directories in our path that we
1156                          * have in common with lastpath. */
1157                         while (*fn && *lp == *fn) {
1158                                 if (*fn == '/')
1159                                         slash = fn;
1160                                 lp++, fn++;
1161                         }
1162                         *p = '/';
1163                         if (fn != p || (*lp && *lp != '/')) {
1164                                 int save_copy_links = copy_links;
1165                                 int save_xfer_dirs = xfer_dirs;
1166                                 copy_links = copy_unsafe_links;
1167                                 xfer_dirs = 1;
1168                                 while ((slash = strchr(slash+1, '/')) != 0) {
1169                                         *slash = 0;
1170                                         send_file_name(f, flist, fname, 0, 0);
1171                                         *slash = '/';
1172                                 }
1173                                 copy_links = save_copy_links;
1174                                 xfer_dirs = save_xfer_dirs;
1175                                 *p = 0;
1176                                 strlcpy(lastpath, fname, sizeof lastpath);
1177                                 *p = '/';
1178                         }
1179                 }
1180
1181                 if (!*fname)
1182                         fname = ".";
1183
1184                 if (dir && *dir) {
1185                         static char *lastdir;
1186                         static int lastdir_len;
1187
1188                         strcpy(olddir, curr_dir); /* can't overflow */
1189
1190                         if (!push_dir(dir)) {
1191                                 io_error |= IOERR_GENERAL;
1192                                 rsyserr(FERROR, errno, "push_dir %s failed",
1193                                         full_fname(dir));
1194                                 continue;
1195                         }
1196
1197                         if (lastdir && strcmp(lastdir, dir) == 0) {
1198                                 flist_dir = lastdir;
1199                                 flist_dir_len = lastdir_len;
1200                         } else {
1201                                 flist_dir = lastdir = strdup(dir);
1202                                 flist_dir_len = lastdir_len = strlen(dir);
1203                         }
1204                 }
1205
1206                 if (one_file_system)
1207                         filesystem_dev = st.st_dev;
1208
1209                 do_subdirs = recurse >= 1 ? recurse-- : recurse;
1210                 send_file_name(f, flist, fname, do_subdirs, XMIT_TOP_DIR);
1211
1212                 if (olddir[0]) {
1213                         flist_dir = NULL;
1214                         flist_dir_len = 0;
1215                         if (!pop_dir(olddir)) {
1216                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1217                                         full_fname(dir));
1218                                 exit_cleanup(RERR_FILESELECT);
1219                         }
1220                 }
1221         }
1222
1223         gettimeofday(&end_tv, NULL);
1224         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1225                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1226         if (stats.flist_buildtime == 0)
1227                 stats.flist_buildtime = 1;
1228         start_tv = end_tv;
1229
1230         send_file_entry(NULL, f, 0);
1231
1232         if (show_filelist_p())
1233                 finish_filelist_progress(flist);
1234
1235         gettimeofday(&end_tv, NULL);
1236         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1237                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1238
1239         if (flist->hlink_pool) {
1240                 pool_destroy(flist->hlink_pool);
1241                 flist->hlink_pool = NULL;
1242         }
1243
1244         clean_flist(flist, 0, 0);
1245
1246         /* Now send the uid/gid list. This was introduced in
1247          * protocol version 15 */
1248         send_uid_list(f);
1249
1250         /* send the io_error flag */
1251         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1252
1253         io_end_buffering();
1254         stats.flist_size = stats.total_written - start_write;
1255         stats.num_files = flist->count;
1256
1257         if (verbose > 3)
1258                 output_flist(flist, who_am_i());
1259
1260         if (verbose > 2)
1261                 rprintf(FINFO, "send_file_list done\n");
1262
1263         return flist;
1264 }
1265
1266
1267 struct file_list *recv_file_list(int f)
1268 {
1269         struct file_list *flist;
1270         unsigned short flags;
1271         int64 start_read;
1272
1273         if (show_filelist_p())
1274                 start_filelist_progress("receiving file list");
1275
1276         start_read = stats.total_read;
1277
1278         flist = flist_new(WITH_HLINK, "recv_file_list");
1279         received_flist = flist;
1280
1281         flist->count = 0;
1282         flist->malloced = 1000;
1283         flist->files = new_array(struct file_struct *, flist->malloced);
1284         if (!flist->files)
1285                 goto oom;
1286
1287
1288         while ((flags = read_byte(f)) != 0) {
1289                 int i = flist->count;
1290
1291                 flist_expand(flist);
1292
1293                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1294                         flags |= read_byte(f) << 8;
1295                 receive_file_entry(flist, i, flags, f);
1296
1297                 if (S_ISREG(flist->files[i]->mode))
1298                         stats.total_size += flist->files[i]->length;
1299
1300                 flist->count++;
1301
1302                 maybe_emit_filelist_progress(flist);
1303
1304                 if (verbose > 2) {
1305                         rprintf(FINFO, "recv_file_name(%s)\n",
1306                                 safe_fname(f_name(flist->files[i])));
1307                 }
1308         }
1309         receive_file_entry(NULL, 0, 0, 0); /* Signal that we're done. */
1310
1311         if (verbose > 2)
1312                 rprintf(FINFO, "received %d names\n", flist->count);
1313
1314         if (show_filelist_p())
1315                 finish_filelist_progress(flist);
1316
1317         clean_flist(flist, relative_paths, 1);
1318
1319         if (f != -1) {
1320                 /* Now send the uid/gid list. This was introduced in
1321                  * protocol version 15 */
1322                 recv_uid_list(f, flist);
1323
1324                 /* Recv the io_error flag */
1325                 if (lp_ignore_errors(module_id) || ignore_errors)
1326                         read_int(f);
1327                 else
1328                         io_error |= read_int(f);
1329         }
1330
1331         if (verbose > 3)
1332                 output_flist(flist, who_am_i());
1333
1334         if (list_only) {
1335                 int i;
1336                 for (i = 0; i < flist->count; i++)
1337                         list_file_entry(flist->files[i]);
1338         }
1339
1340         if (verbose > 2)
1341                 rprintf(FINFO, "recv_file_list done\n");
1342
1343         stats.flist_size = stats.total_read - start_read;
1344         stats.num_files = flist->count;
1345
1346         return flist;
1347
1348 oom:
1349         out_of_memory("recv_file_list");
1350         return NULL;            /* not reached */
1351 }
1352
1353
1354 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1355 {
1356         return f_name_cmp(*file1, *file2);
1357 }
1358
1359
1360 int flist_find(struct file_list *flist, struct file_struct *f)
1361 {
1362         int low = flist->low, high = flist->high;
1363         int ret, mid, mid_up;
1364
1365         while (low <= high) {
1366                 mid = (low + high) / 2;
1367                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1368                 if (mid_up <= high)
1369                         ret = f_name_cmp(flist->files[mid_up], f);
1370                 else
1371                         ret = 1;
1372                 if (ret == 0)
1373                         return mid_up;
1374                 if (ret > 0)
1375                         high = mid - 1;
1376                 else
1377                         low = mid_up + 1;
1378         }
1379         return -1;
1380 }
1381
1382 /*
1383  * Free up any resources a file_struct has allocated
1384  * and clear the file.
1385  */
1386 void clear_file(int i, struct file_list *flist)
1387 {
1388         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1389                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1390         memset(flist->files[i], 0, file_struct_len);
1391 }
1392
1393
1394 /*
1395  * allocate a new file list
1396  */
1397 struct file_list *flist_new(int with_hlink, char *msg)
1398 {
1399         struct file_list *flist;
1400
1401         flist = new(struct file_list);
1402         if (!flist)
1403                 out_of_memory(msg);
1404
1405         memset(flist, 0, sizeof (struct file_list));
1406
1407         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1408             out_of_memory, POOL_INTERN)))
1409                 out_of_memory(msg);
1410
1411 #if SUPPORT_HARD_LINKS
1412         if (with_hlink && preserve_hard_links) {
1413                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1414                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1415                         out_of_memory(msg);
1416         }
1417 #endif
1418
1419         return flist;
1420 }
1421
1422 /*
1423  * free up all elements in a flist
1424  */
1425 void flist_free(struct file_list *flist)
1426 {
1427         pool_destroy(flist->file_pool);
1428         pool_destroy(flist->hlink_pool);
1429         free(flist->files);
1430         free(flist);
1431 }
1432
1433
1434 /*
1435  * This routine ensures we don't have any duplicate names in our file list.
1436  * duplicate names can cause corruption because of the pipelining
1437  */
1438 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1439 {
1440         int i, prev_i = 0;
1441
1442         if (!flist || flist->count == 0)
1443                 return;
1444
1445         qsort(flist->files, flist->count,
1446             sizeof flist->files[0], (int (*)())file_compare);
1447
1448         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1449                 if (flist->files[i]->basename) {
1450                         prev_i = i;
1451                         break;
1452                 }
1453         }
1454         flist->low = prev_i;
1455         while (++i < flist->count) {
1456                 if (!flist->files[i]->basename)
1457                         continue;
1458                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1459                         if (verbose > 1 && !am_server) {
1460                                 rprintf(FINFO,
1461                                         "removing duplicate name %s from file list %d\n",
1462                                         safe_fname(f_name(flist->files[i])), i);
1463                         }
1464                         /* Make sure that if we unduplicate '.', that we don't
1465                          * lose track of a user-specified top directory. */
1466                         if (flist->files[i]->flags & FLAG_TOP_DIR)
1467                                 flist->files[prev_i]->flags |= FLAG_TOP_DIR;
1468
1469                         clear_file(i, flist);
1470                 } else
1471                         prev_i = i;
1472         }
1473         flist->high = prev_i;
1474
1475         if (strip_root) {
1476                 /* we need to strip off the root directory in the case
1477                    of relative paths, but this must be done _after_
1478                    the sorting phase */
1479                 for (i = 0; i < flist->count; i++) {
1480                         if (flist->files[i]->dirname &&
1481                             flist->files[i]->dirname[0] == '/') {
1482                                 memmove(&flist->files[i]->dirname[0],
1483                                         &flist->files[i]->dirname[1],
1484                                         strlen(flist->files[i]->dirname));
1485                         }
1486
1487                         if (flist->files[i]->dirname &&
1488                             !flist->files[i]->dirname[0]) {
1489                                 flist->files[i]->dirname = NULL;
1490                         }
1491                 }
1492         }
1493 }
1494
1495 static void output_flist(struct file_list *flist, const char *whose_list)
1496 {
1497         char uidbuf[16], gidbuf[16], depthbuf[16];
1498         struct file_struct *file;
1499         int i;
1500
1501         for (i = 0; i < flist->count; i++) {
1502                 file = flist->files[i];
1503                 if ((am_root || am_sender) && preserve_uid)
1504                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1505                 else
1506                         *uidbuf = '\0';
1507                 if (preserve_gid && file->gid != GID_NONE)
1508                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1509                 else
1510                         *gidbuf = '\0';
1511                 if (!am_sender)
1512                         sprintf(depthbuf, "%d", file->dir.depth);
1513                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1514                         whose_list, i, am_sender ? NS(file->dir.root) : depthbuf,
1515                         file->dirname ? safe_fname(file->dirname) : "",
1516                         file->dirname ? "/" : "", NS(file->basename),
1517                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1518                         (double)file->length, uidbuf, gidbuf, file->flags);
1519         }
1520 }
1521
1522
1523 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE, fnc_TRAILING };
1524
1525 /* Compare the names of two file_struct entities, similar to how strcmp()
1526  * would do if it were operating on the joined strings.  The only difference
1527  * is that, beginning with protocol_version 29, a directory name will always
1528  * sort immediately prior to its contents (previously "foo." would sort in
1529  * between directory "foo" and "foo/bar").  We do this by assuming that a dir
1530  * has a trailing slash for comparison purposes, but only if we aren't about
1531  * to match a file of the same name (because we need all identically named
1532  * items to match each other).  The dirname component can be an empty string,
1533  * but the basename component cannot (and never is in the current codebase).
1534  * The basename component may be NULL, in which case it is sorted to the end
1535  * of the list (as a removed item). */
1536 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1537 {
1538         int dif;
1539         const uchar *c1, *c2;
1540         enum fnc_state state1, state2;
1541
1542         if (!f1 || !f1->basename) {
1543                 if (!f2 || !f2->basename)
1544                         return 0;
1545                 return -1;
1546         }
1547         if (!f2 || !f2->basename)
1548                 return 1;
1549
1550         c1 = (uchar*)f1->dirname;
1551         c2 = (uchar*)f2->dirname;
1552         if (c1 == c2)
1553                 c1 = c2 = NULL;
1554         if (!c1) {
1555                 state1 = fnc_BASE;
1556                 c1 = (uchar*)f1->basename;
1557         } else if (!*c1) {
1558                 state1 = fnc_SLASH;
1559                 c1 = (uchar*)"/";
1560         } else
1561                 state1 = fnc_DIR;
1562         if (!c2) {
1563                 state2 = fnc_BASE;
1564                 c2 = (uchar*)f2->basename;
1565         } else if (!*c2) {
1566                 state2 = fnc_SLASH;
1567                 c2 = (uchar*)"/";
1568         } else
1569                 state2 = fnc_DIR;
1570
1571         while (1) {
1572                 if ((dif = (int)*c1 - (int)*c2) != 0)
1573                         break;
1574                 if (!*++c1) {
1575                         switch (state1) {
1576                         case fnc_DIR:
1577                                 state1 = fnc_SLASH;
1578                                 c1 = (uchar*)"/";
1579                                 break;
1580                         case fnc_SLASH:
1581                                 state1 = fnc_BASE;
1582                                 c1 = (uchar*)f1->basename;
1583                                 break;
1584                         case fnc_BASE:
1585                                 state1 = fnc_TRAILING;
1586                                 if (protocol_version >= 29 && S_ISDIR(f1->mode))
1587                                         c1 = (uchar*)"/";
1588                                 break;
1589                         case fnc_TRAILING:
1590                                 break;
1591                         }
1592                 }
1593                 if (!*++c2) {
1594                         switch (state2) {
1595                         case fnc_DIR:
1596                                 state2 = fnc_SLASH;
1597                                 c2 = (uchar*)"/";
1598                                 break;
1599                         case fnc_SLASH:
1600                                 state2 = fnc_BASE;
1601                                 c2 = (uchar*)f2->basename;
1602                                 break;
1603                         case fnc_BASE:
1604                                 if (state1 == fnc_TRAILING)
1605                                         return 0;
1606                                 state2 = fnc_TRAILING;
1607                                 if (protocol_version >= 29 && S_ISDIR(f2->mode))
1608                                         c2 = (uchar*)"/";
1609                                 break;
1610                         case fnc_TRAILING:
1611                                 break;
1612                         }
1613                 }
1614         }
1615
1616         return dif;
1617 }
1618
1619
1620 /* Return a copy of the full filename of a flist entry, using the indicated
1621  * buffer.  No size-checking is done because we checked the size when creating
1622  * the file_struct entry.
1623  */
1624 char *f_name_to(struct file_struct *f, char *fbuf)
1625 {
1626         if (!f || !f->basename)
1627                 return NULL;
1628
1629         if (f->dirname) {
1630                 int len = strlen(f->dirname);
1631                 memcpy(fbuf, f->dirname, len);
1632                 fbuf[len] = '/';
1633                 strcpy(fbuf + len + 1, f->basename);
1634         } else
1635                 strcpy(fbuf, f->basename);
1636         return fbuf;
1637 }
1638
1639
1640 /* Like f_name_to(), but we rotate through 5 static buffers of our own. */
1641 char *f_name(struct file_struct *f)
1642 {
1643         static char names[5][MAXPATHLEN];
1644         static unsigned int n;
1645
1646         n = (n + 1) % (sizeof names / sizeof names[0]);
1647
1648         return f_name_to(f, names[n]);
1649 }
1650
1651
1652 static int is_backup_file(char *fn)
1653 {
1654         int k = strlen(fn) - backup_suffix_len;
1655         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
1656 }
1657
1658
1659 /* This function is used to implement per-directory deletion, and
1660  * is used by all the --delete-WHEN options.  Note that the fbuf
1661  * pointer must point to a MAXPATHLEN buffer with the name of the
1662  * directory in it (the functions we call will append names onto
1663  * the end, but the old dir value will be restored on exit). */
1664 void delete_in_dir(struct file_list *flist, char *fbuf,
1665                    struct file_struct *file)
1666 {
1667         static int min_depth = MAXPATHLEN, cur_depth = -1;
1668         static void *filt_array[MAXPATHLEN/2+1];
1669         struct file_list *dir_list;
1670         STRUCT_STAT st;
1671         int dlen;
1672
1673         if (!flist) {
1674                 while (cur_depth >= min_depth)
1675                         pop_local_filters(filt_array[cur_depth--]);
1676                 min_depth = MAXPATHLEN;
1677                 cur_depth = -1;
1678                 return;
1679         }
1680         if (file->dir.depth >= MAXPATHLEN/2+1)
1681                 return; /* Impossible... */
1682
1683         if (max_delete && deletion_count >= max_delete)
1684                 return;
1685
1686         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
1687                 rprintf(FINFO,
1688                         "IO error encountered -- skipping file deletion\n");
1689                 max_delete = -1; /* avoid duplicating the above warning */
1690                 return;
1691         }
1692
1693         while (cur_depth >= file->dir.depth && cur_depth >= min_depth)
1694                 pop_local_filters(filt_array[cur_depth--]);
1695         cur_depth = file->dir.depth;
1696         if (min_depth > cur_depth)
1697                 min_depth = cur_depth;
1698         dlen = strlen(fbuf);
1699         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
1700
1701         if (link_stat(fbuf, &st, keep_dirlinks) < 0)
1702                 return;
1703
1704         if (one_file_system && file->flags & FLAG_TOP_DIR)
1705                 filesystem_dev = st.st_dev;
1706
1707         dir_list = flist_new(WITHOUT_HLINK, "delete_in_dir");
1708
1709         recurse = 0;
1710         send_directory(-1, dir_list, fbuf, dlen);
1711         recurse = -1;
1712         fbuf[dlen] = '\0';
1713
1714         if (verbose > 3)
1715                 output_flist(dir_list, "delete");
1716
1717         delete_missing(flist, dir_list, fbuf);
1718
1719         flist_free(dir_list);
1720 }
1721
1722
1723 /* If an item in dir_list is not found in full_list, delete it from the
1724  * filesystem. */
1725 void delete_missing(struct file_list *full_list, struct file_list *dir_list,
1726                     const char *dirname)
1727 {
1728         int i, j, mode;
1729
1730         if (max_delete && deletion_count >= max_delete)
1731                 return;
1732
1733         if (verbose > 2)
1734                 rprintf(FINFO, "delete_missing(%s)\n", safe_fname(dirname));
1735
1736         for (i = dir_list->count; i--; ) {
1737                 if (!dir_list->files[i]->basename)
1738                         continue;
1739                 mode = dir_list->files[i]->mode;
1740                 if ((j = flist_find(full_list, dir_list->files[i])) < 0
1741                     || (S_ISDIR(mode) && !S_ISDIR(full_list->files[j]->mode))) {
1742                         char *f = f_name(dir_list->files[i]);
1743                         if (make_backups && (backup_dir || !is_backup_file(f))
1744                           && !S_ISDIR(mode)) {
1745                                 make_backup(f);
1746                                 if (verbose) {
1747                                         rprintf(FINFO, "deleting %s\n",
1748                                                 safe_fname(f));
1749                                 }
1750                         } else if (S_ISDIR(mode))
1751                                 delete_file(f, DEL_DIR | DEL_FORCE_RECURSE);
1752                         else
1753                                 delete_file(f, 0);
1754                         deletion_count++;
1755                         if (max_delete && deletion_count >= max_delete)
1756                                 break;
1757                 }
1758         }
1759 }