- Iterate through the deletion list in reverse order so that we
[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 dry_run;
34 extern int list_only;
35 extern int am_root;
36 extern int am_server;
37 extern int am_daemon;
38 extern int am_sender;
39 extern int do_progress;
40 extern int always_checksum;
41 extern int module_id;
42 extern int ignore_errors;
43 extern int numeric_ids;
44 extern int recurse;
45 extern int xfer_dirs;
46 extern int filesfrom_fd;
47 extern int one_file_system;
48 extern int keep_dirlinks;
49 extern int preserve_links;
50 extern int preserve_hard_links;
51 extern int preserve_perms;
52 extern int preserve_devices;
53 extern int preserve_uid;
54 extern int preserve_gid;
55 extern int relative_paths;
56 extern int implied_dirs;
57 extern int copy_links;
58 extern int copy_unsafe_links;
59 extern int protocol_version;
60 extern int sanitize_paths;
61 extern int max_delete;
62 extern int force_delete;
63 extern int orig_umask;
64 extern int make_backups;
65 extern unsigned int curr_dir_len;
66 extern char *log_format;
67 extern char *backup_dir;
68 extern char *backup_suffix;
69 extern int backup_suffix_len;
70
71 extern char curr_dir[MAXPATHLEN];
72
73 extern struct filter_list_struct filter_list;
74 extern struct filter_list_struct server_filter_list;
75
76 int io_error;
77
78 static char empty_sum[MD4_SUM_LENGTH];
79 static unsigned int file_struct_len;
80 static struct file_list *received_flist, *sorting_flist;
81 static dev_t filesystem_dev; /* used to implement -x */
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 #ifdef 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 #ifdef 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 #ifdef 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 #ifdef 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 < 0)
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 #ifdef 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 #ifdef 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 #ifdef 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 struct file_struct *receive_file_entry(struct file_list *flist,
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 NULL;
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 #ifdef 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 = (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 #ifdef 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 #ifdef 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         return file;
738 }
739
740
741 /**
742  * Create a file_struct for a named file by reading its stat()
743  * information and performing extensive checks against global
744  * options.
745  *
746  * @return the new file, or NULL if there was an error or this file
747  * should be excluded.
748  *
749  * @todo There is a small optimization opportunity here to avoid
750  * stat()ing the file in some circumstances, which has a certain cost.
751  * We are called immediately after doing readdir(), and so we may
752  * already know the d_type of the file.  We could for example avoid
753  * statting directories if we're not recursing, but this is not a very
754  * important case.  Some systems may not have d_type.
755  **/
756 struct file_struct *make_file(char *fname, struct file_list *flist,
757                               int filter_level)
758 {
759         static char *lastdir;
760         static int lastdir_len = -1;
761         struct file_struct *file;
762         STRUCT_STAT st;
763         char sum[SUM_LENGTH];
764         char thisname[MAXPATHLEN];
765         char linkname[MAXPATHLEN];
766         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
767         char *basename, *dirname, *bp;
768         unsigned short flags = 0;
769
770         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
771                 lastdir_len = -1;
772
773         if (strlcpy(thisname, fname, sizeof thisname)
774             >= sizeof thisname - flist_dir_len) {
775                 rprintf(FINFO, "skipping overly long name: %s\n",
776                         safe_fname(fname));
777                 return NULL;
778         }
779         clean_fname(thisname, 0);
780         if (sanitize_paths)
781                 sanitize_path(thisname, thisname, "", 0);
782
783         memset(sum, 0, SUM_LENGTH);
784
785         if (readlink_stat(thisname, &st, linkname) != 0) {
786                 int save_errno = errno;
787                 /* See if file is excluded before reporting an error. */
788                 if (filter_level != NO_FILTERS
789                     && is_excluded(thisname, 0, filter_level))
790                         return NULL;
791                 if (save_errno == ENOENT) {
792 #ifdef SUPPORT_LINKS
793                         /* Avoid "vanished" error if symlink points nowhere. */
794                         if (copy_links && do_lstat(thisname, &st) == 0
795                             && S_ISLNK(st.st_mode)) {
796                                 io_error |= IOERR_GENERAL;
797                                 rprintf(FERROR, "symlink has no referent: %s\n",
798                                         full_fname(thisname));
799                         } else
800 #endif
801                         {
802                                 enum logcode c = am_daemon && protocol_version < 28
803                                     ? FERROR : FINFO;
804                                 io_error |= IOERR_VANISHED;
805                                 rprintf(c, "file has vanished: %s\n",
806                                         full_fname(thisname));
807                         }
808                 } else {
809                         io_error |= IOERR_GENERAL;
810                         rsyserr(FERROR, save_errno, "readlink %s failed",
811                                 full_fname(thisname));
812                 }
813                 return NULL;
814         }
815
816         /* backup.c calls us with filter_level set to NO_FILTERS. */
817         if (filter_level == NO_FILTERS)
818                 goto skip_filters;
819
820         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
821                 rprintf(FINFO, "skipping directory %s\n", safe_fname(thisname));
822                 return NULL;
823         }
824
825         /* We only care about directories because we need to avoid recursing
826          * into a mount-point directory, not to avoid copying a symlinked
827          * file if -L (or similar) was specified. */
828         if (one_file_system && st.st_dev != filesystem_dev
829             && S_ISDIR(st.st_mode))
830                 flags |= FLAG_MOUNT_POINT;
831
832         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
833                 return NULL;
834
835         if (lp_ignore_nonreadable(module_id)) {
836 #ifdef SUPPORT_LINKS
837                 if (!S_ISLNK(st.st_mode))
838 #endif
839                         if (access(thisname, R_OK) != 0)
840                                 return NULL;
841         }
842
843 skip_filters:
844
845         if (verbose > 2) {
846                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
847                         who_am_i(), safe_fname(thisname), filter_level);
848         }
849
850         if ((basename = strrchr(thisname, '/')) != NULL) {
851                 dirname_len = ++basename - thisname; /* counts future '\0' */
852                 if (lastdir_len == dirname_len - 1
853                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
854                         dirname = lastdir;
855                         dirname_len = 0; /* indicates no copy is needed */
856                 } else
857                         dirname = thisname;
858         } else {
859                 basename = thisname;
860                 dirname = NULL;
861                 dirname_len = 0;
862         }
863         basename_len = strlen(basename) + 1; /* count the '\0' */
864
865 #ifdef SUPPORT_LINKS
866         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
867 #else
868         linkname_len = 0;
869 #endif
870
871         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
872
873         alloc_len = file_struct_len + dirname_len + basename_len
874             + linkname_len + sum_len;
875         if (flist) {
876                 bp = pool_alloc(flist->file_pool, alloc_len,
877                     "receive_file_entry");
878         } else {
879                 if (!(bp = new_array(char, alloc_len)))
880                         out_of_memory("receive_file_entry");
881         }
882
883         file = (struct file_struct *)bp;
884         memset(bp, 0, file_struct_len);
885         bp += file_struct_len;
886
887         file->flags = flags;
888         file->modtime = st.st_mtime;
889         file->length = st.st_size;
890         file->mode = st.st_mode;
891         file->uid = st.st_uid;
892         file->gid = st.st_gid;
893
894 #ifdef SUPPORT_HARD_LINKS
895         if (flist && flist->hlink_pool) {
896                 if (protocol_version < 28) {
897                         if (S_ISREG(st.st_mode))
898                                 file->link_u.idev = pool_talloc(
899                                     flist->hlink_pool, struct idev, 1,
900                                     "inode_table");
901                 } else {
902                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
903                                 file->link_u.idev = pool_talloc(
904                                     flist->hlink_pool, struct idev, 1,
905                                     "inode_table");
906                 }
907         }
908         if (file->link_u.idev) {
909                 file->F_DEV = st.st_dev;
910                 file->F_INODE = st.st_ino;
911         }
912 #endif
913
914         if (dirname_len) {
915                 file->dirname = lastdir = bp;
916                 lastdir_len = dirname_len - 1;
917                 memcpy(bp, dirname, dirname_len - 1);
918                 bp += dirname_len;
919                 bp[-1] = '\0';
920         } else if (dirname)
921                 file->dirname = dirname;
922
923         file->basename = bp;
924         memcpy(bp, basename, basename_len);
925         bp += basename_len;
926
927 #ifdef HAVE_STRUCT_STAT_ST_RDEV
928         if (preserve_devices && IS_DEVICE(st.st_mode))
929                 file->u.rdev = st.st_rdev;
930 #endif
931
932 #ifdef SUPPORT_LINKS
933         if (linkname_len) {
934                 file->u.link = bp;
935                 memcpy(bp, linkname, linkname_len);
936                 bp += linkname_len;
937         }
938 #endif
939
940         if (sum_len) {
941                 file->u.sum = bp;
942                 file_checksum(thisname, bp, st.st_size);
943                 /*bp += sum_len;*/
944         }
945
946         file->dir.root = flist_dir;
947
948         /* This code is only used by the receiver when it is building
949          * a list of files for a delete pass. */
950         if (keep_dirlinks && linkname_len && flist) {
951                 STRUCT_STAT st2;
952                 int save_mode = file->mode;
953                 file->mode = S_IFDIR; /* find a directory w/our name */
954                 if (flist_find(received_flist, file) >= 0
955                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
956                         file->modtime = st2.st_mtime;
957                         file->length = st2.st_size;
958                         file->mode = st2.st_mode;
959                         file->uid = st2.st_uid;
960                         file->gid = st2.st_gid;
961                         file->u.link = NULL;
962                 } else
963                         file->mode = save_mode;
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         file = make_file(fname, flist, f == -2 ? SERVER_FILTERS : ALL_FILTERS);
980         if (!file)
981                 return;
982
983         maybe_emit_filelist_progress(flist);
984
985         flist_expand(flist);
986
987         if (file->basename[0]) {
988                 flist->files[flist->count++] = file;
989                 send_file_entry(file, f, base_flags);
990         }
991
992         if (recursive && S_ISDIR(file->mode)
993             && !(file->flags & FLAG_MOUNT_POINT) && f_name_to(file, fbuf)) {
994                 void *save_filters;
995                 unsigned int len = strlen(fbuf);
996                 if (len > 1 && fbuf[len-1] == '/')
997                         fbuf[--len] = '\0';
998                 if (len >= MAXPATHLEN - 1) {
999                         io_error |= IOERR_GENERAL;
1000                         rprintf(FERROR, "skipping long-named directory: %s\n",
1001                                 full_fname(fbuf));
1002                         return;
1003                 }
1004                 save_filters = push_local_filters(fbuf, len);
1005                 send_directory(f, flist, fbuf, len);
1006                 pop_local_filters(save_filters);
1007         }
1008 }
1009
1010
1011 /* Note that the "recurse" value either contains -1, for infinite recursion,
1012  * or a number >= 0 indicating how many levels of recursion we will allow.
1013  * This function is normally called by the sender, but the receiving side
1014  * also calls it from delete_in_dir() with f set to -1 so that we just
1015  * construct the file list in memory without sending it over the wire.  Also,
1016  * get_dirlist() calls this with f set to -2, which indicates that local
1017  * filter rules should be ignored. */
1018 static void send_directory(int f, struct file_list *flist,
1019                            char *fbuf, unsigned int len)
1020 {
1021         struct dirent *di;
1022         char *p;
1023         DIR *d;
1024
1025         if (!(d = opendir(fbuf))) {
1026                 io_error |= IOERR_GENERAL;
1027                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1028                 return;
1029         }
1030
1031         p = fbuf + len;
1032         if (len != 1 || *fbuf != '/')
1033                 *p++ = '/';
1034         *p = '\0';
1035
1036         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1037                 char *dname = d_name(di);
1038                 if (dname[0] == '.' && (dname[1] == '\0'
1039                     || (dname[1] == '.' && dname[2] == '\0')))
1040                         continue;
1041                 if (strlcpy(p, dname, MAXPATHLEN - len) < MAXPATHLEN - len) {
1042                         int do_subdirs = recurse >= 1 ? recurse-- : recurse;
1043                         send_file_name(f, flist, fbuf, do_subdirs, 0);
1044                 } else {
1045                         io_error |= IOERR_GENERAL;
1046                         rprintf(FINFO,
1047                                 "cannot send long-named file %s\n",
1048                                 full_fname(fbuf));
1049                 }
1050         }
1051         if (errno) {
1052                 io_error |= IOERR_GENERAL;
1053                 *p = '\0';
1054                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1055         }
1056
1057         closedir(d);
1058 }
1059
1060
1061 struct file_list *send_file_list(int f, int argc, char *argv[])
1062 {
1063         int l;
1064         STRUCT_STAT st;
1065         char *p, *dir, olddir[sizeof curr_dir];
1066         char lastpath[MAXPATHLEN] = "";
1067         struct file_list *flist;
1068         struct timeval start_tv, end_tv;
1069         int64 start_write;
1070         int use_ff_fd = 0;
1071
1072         if (show_filelist_p())
1073                 start_filelist_progress("building file list");
1074
1075         start_write = stats.total_written;
1076         gettimeofday(&start_tv, NULL);
1077
1078         flist = flist_new(WITH_HLINK, "send_file_list");
1079
1080         io_start_buffering_out();
1081         if (filesfrom_fd >= 0) {
1082                 if (argv[0] && !push_dir(argv[0])) {
1083                         rsyserr(FERROR, errno, "push_dir %s failed",
1084                                 full_fname(argv[0]));
1085                         exit_cleanup(RERR_FILESELECT);
1086                 }
1087                 use_ff_fd = 1;
1088         }
1089
1090         while (1) {
1091                 char fname2[MAXPATHLEN];
1092                 char *fname = fname2;
1093                 int do_subdirs;
1094
1095                 if (use_ff_fd) {
1096                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1097                                 break;
1098                         sanitize_path(fname, fname, "", 0);
1099                 } else {
1100                         if (argc-- == 0)
1101                                 break;
1102                         strlcpy(fname, *argv++, MAXPATHLEN);
1103                         if (sanitize_paths)
1104                                 sanitize_path(fname, fname, "", 0);
1105                 }
1106
1107                 l = strlen(fname);
1108                 if (!l || fname[l - 1] == '/') {
1109                         if (l == 2 && fname[0] == '.') {
1110                                 /* Turn "./" into just "." rather than "./." */
1111                                 fname[1] = '\0';
1112                         } else if (l < MAXPATHLEN) {
1113                                 fname[l++] = '.';
1114                                 fname[l] = '\0';
1115                         }
1116                 }
1117                 if (fname[l-1] == '.' && (l == 1 || fname[l-2] == '/')) {
1118                         if (!recurse && xfer_dirs)
1119                                 recurse = 1; /* allow one level */
1120                 } else if (recurse > 0)
1121                         recurse = 0;
1122
1123                 if (link_stat(fname, &st, keep_dirlinks) != 0) {
1124                         io_error |= IOERR_GENERAL;
1125                         rsyserr(FERROR, errno, "link_stat %s failed",
1126                                 full_fname(fname));
1127                         continue;
1128                 }
1129
1130                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1131                         rprintf(FINFO, "skipping directory %s\n",
1132                                 safe_fname(fname));
1133                         continue;
1134                 }
1135
1136                 dir = NULL;
1137                 olddir[0] = '\0';
1138
1139                 if (!relative_paths) {
1140                         p = strrchr(fname, '/');
1141                         if (p) {
1142                                 *p = 0;
1143                                 if (p == fname)
1144                                         dir = "/";
1145                                 else
1146                                         dir = fname;
1147                                 fname = p + 1;
1148                         }
1149                 } else if (implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1150                         /* this ensures we send the intermediate directories,
1151                            thus getting their permissions right */
1152                         char *lp = lastpath, *fn = fname, *slash = fname;
1153                         *p = 0;
1154                         /* Skip any initial directories in our path that we
1155                          * have in common with lastpath. */
1156                         while (*fn && *lp == *fn) {
1157                                 if (*fn == '/')
1158                                         slash = fn;
1159                                 lp++, fn++;
1160                         }
1161                         *p = '/';
1162                         if (fn != p || (*lp && *lp != '/')) {
1163                                 int save_copy_links = copy_links;
1164                                 int save_xfer_dirs = xfer_dirs;
1165                                 copy_links = copy_unsafe_links;
1166                                 xfer_dirs = 1;
1167                                 while ((slash = strchr(slash+1, '/')) != 0) {
1168                                         *slash = 0;
1169                                         send_file_name(f, flist, fname, 0, 0);
1170                                         *slash = '/';
1171                                 }
1172                                 copy_links = save_copy_links;
1173                                 xfer_dirs = save_xfer_dirs;
1174                                 *p = 0;
1175                                 strlcpy(lastpath, fname, sizeof lastpath);
1176                                 *p = '/';
1177                         }
1178                 }
1179
1180                 if (!*fname)
1181                         fname = ".";
1182
1183                 if (dir && *dir) {
1184                         static char *lastdir;
1185                         static int lastdir_len;
1186
1187                         strcpy(olddir, curr_dir); /* can't overflow */
1188
1189                         if (!push_dir(dir)) {
1190                                 io_error |= IOERR_GENERAL;
1191                                 rsyserr(FERROR, errno, "push_dir %s failed",
1192                                         full_fname(dir));
1193                                 continue;
1194                         }
1195
1196                         if (lastdir && strcmp(lastdir, dir) == 0) {
1197                                 flist_dir = lastdir;
1198                                 flist_dir_len = lastdir_len;
1199                         } else {
1200                                 flist_dir = lastdir = strdup(dir);
1201                                 flist_dir_len = lastdir_len = strlen(dir);
1202                         }
1203                 }
1204
1205                 if (one_file_system)
1206                         filesystem_dev = st.st_dev;
1207
1208                 do_subdirs = recurse >= 1 ? recurse-- : recurse;
1209                 send_file_name(f, flist, fname, do_subdirs, XMIT_TOP_DIR);
1210
1211                 if (olddir[0]) {
1212                         flist_dir = NULL;
1213                         flist_dir_len = 0;
1214                         if (!pop_dir(olddir)) {
1215                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1216                                         full_fname(dir));
1217                                 exit_cleanup(RERR_FILESELECT);
1218                         }
1219                 }
1220         }
1221
1222         gettimeofday(&end_tv, NULL);
1223         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1224                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1225         if (stats.flist_buildtime == 0)
1226                 stats.flist_buildtime = 1;
1227         start_tv = end_tv;
1228
1229         send_file_entry(NULL, f, 0);
1230
1231         if (show_filelist_p())
1232                 finish_filelist_progress(flist);
1233
1234         gettimeofday(&end_tv, NULL);
1235         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1236                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1237
1238         if (flist->hlink_pool) {
1239                 pool_destroy(flist->hlink_pool);
1240                 flist->hlink_pool = NULL;
1241         }
1242
1243         /* Sort the list without removing any duplicates.  This allows the
1244          * receiving side to ask for any name they like, which gives us the
1245          * flexibility to change the way we unduplicate names in the future
1246          * without causing a compatibility problem with older versions. */
1247         clean_flist(flist, 0, 0);
1248
1249         /* Now send the uid/gid list. This was introduced in
1250          * protocol version 15 */
1251         send_uid_list(f);
1252
1253         /* send the io_error flag */
1254         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1255
1256         io_end_buffering();
1257         stats.flist_size = stats.total_written - start_write;
1258         stats.num_files = flist->count;
1259
1260         if (verbose > 3)
1261                 output_flist(flist, who_am_i());
1262
1263         if (verbose > 2)
1264                 rprintf(FINFO, "send_file_list done\n");
1265
1266         return flist;
1267 }
1268
1269
1270 struct file_list *recv_file_list(int f)
1271 {
1272         struct file_list *flist;
1273         unsigned short flags;
1274         int64 start_read;
1275
1276         if (show_filelist_p())
1277                 start_filelist_progress("receiving file list");
1278
1279         start_read = stats.total_read;
1280
1281         flist = flist_new(WITH_HLINK, "recv_file_list");
1282         received_flist = flist;
1283
1284         flist->count = 0;
1285         flist->malloced = 1000;
1286         flist->files = new_array(struct file_struct *, flist->malloced);
1287         if (!flist->files)
1288                 goto oom;
1289
1290
1291         while ((flags = read_byte(f)) != 0) {
1292                 struct file_struct *file;
1293
1294                 flist_expand(flist);
1295
1296                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1297                         flags |= read_byte(f) << 8;
1298                 file = receive_file_entry(flist, flags, f);
1299
1300                 if (S_ISREG(file->mode))
1301                         stats.total_size += file->length;
1302
1303                 flist->files[flist->count++] = file;
1304
1305                 maybe_emit_filelist_progress(flist);
1306
1307                 if (verbose > 2) {
1308                         rprintf(FINFO, "recv_file_name(%s)\n",
1309                                 safe_fname(f_name(file)));
1310                 }
1311         }
1312         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1313
1314         if (verbose > 2)
1315                 rprintf(FINFO, "received %d names\n", flist->count);
1316
1317         if (show_filelist_p())
1318                 finish_filelist_progress(flist);
1319
1320         clean_flist(flist, relative_paths, 1);
1321
1322         if (f >= 0) {
1323                 /* Now send the uid/gid list. This was introduced in
1324                  * protocol version 15 */
1325                 recv_uid_list(f, flist);
1326
1327                 /* Recv the io_error flag */
1328                 if (lp_ignore_errors(module_id) || ignore_errors)
1329                         read_int(f);
1330                 else
1331                         io_error |= read_int(f);
1332         }
1333
1334         if (verbose > 3)
1335                 output_flist(flist, who_am_i());
1336
1337         if (list_only) {
1338                 int i;
1339                 for (i = 0; i < flist->count; i++)
1340                         list_file_entry(flist->files[i]);
1341         }
1342
1343         if (verbose > 2)
1344                 rprintf(FINFO, "recv_file_list done\n");
1345
1346         stats.flist_size = stats.total_read - start_read;
1347         stats.num_files = flist->count;
1348
1349         return flist;
1350
1351 oom:
1352         out_of_memory("recv_file_list");
1353         return NULL;            /* not reached */
1354 }
1355
1356
1357 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1358 {
1359         return f_name_cmp(*file1, *file2);
1360 }
1361
1362
1363 /* Search for an identically-named item in the file list.  Note that the
1364  * items must agree in their directory-ness, or no match is returned. */
1365 int flist_find(struct file_list *flist, struct file_struct *f)
1366 {
1367         int low = flist->low, high = flist->high;
1368         int ret, mid, mid_up;
1369
1370         while (low <= high) {
1371                 mid = (low + high) / 2;
1372                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1373                 if (mid_up <= high)
1374                         ret = f_name_cmp(flist->files[mid_up], f);
1375                 else
1376                         ret = 1;
1377                 if (ret == 0) {
1378                         if (protocol_version < 29
1379                             && S_ISDIR(flist->files[mid_up]->mode)
1380                             != S_ISDIR(f->mode))
1381                                 return -1;
1382                         return mid_up;
1383                 }
1384                 if (ret > 0)
1385                         high = mid - 1;
1386                 else
1387                         low = mid_up + 1;
1388         }
1389         return -1;
1390 }
1391
1392
1393 /*
1394  * Free up any resources a file_struct has allocated
1395  * and clear the file.
1396  */
1397 void clear_file(int i, struct file_list *flist)
1398 {
1399         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1400                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1401         memset(flist->files[i], 0, file_struct_len);
1402 }
1403
1404
1405 /*
1406  * allocate a new file list
1407  */
1408 struct file_list *flist_new(int with_hlink, char *msg)
1409 {
1410         struct file_list *flist;
1411
1412         flist = new(struct file_list);
1413         if (!flist)
1414                 out_of_memory(msg);
1415
1416         memset(flist, 0, sizeof (struct file_list));
1417
1418         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1419             out_of_memory, POOL_INTERN)))
1420                 out_of_memory(msg);
1421
1422 #ifdef SUPPORT_HARD_LINKS
1423         if (with_hlink && preserve_hard_links) {
1424                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1425                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1426                         out_of_memory(msg);
1427         }
1428 #endif
1429
1430         return flist;
1431 }
1432
1433 /*
1434  * free up all elements in a flist
1435  */
1436 void flist_free(struct file_list *flist)
1437 {
1438         pool_destroy(flist->file_pool);
1439         pool_destroy(flist->hlink_pool);
1440         free(flist->files);
1441         free(flist);
1442 }
1443
1444
1445 /*
1446  * This routine ensures we don't have any duplicate names in our file list.
1447  * duplicate names can cause corruption because of the pipelining
1448  */
1449 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1450 {
1451         int i, prev_i = 0;
1452
1453         if (!flist || flist->count == 0)
1454                 return;
1455
1456         sorting_flist = flist;
1457         qsort(flist->files, flist->count,
1458             sizeof flist->files[0], (int (*)())file_compare);
1459         sorting_flist = NULL;
1460
1461         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1462                 if (flist->files[i]->basename) {
1463                         prev_i = i;
1464                         break;
1465                 }
1466         }
1467         flist->low = prev_i;
1468         while (++i < flist->count) {
1469                 int j;
1470                 struct file_struct *file = flist->files[i];
1471
1472                 if (!file->basename)
1473                         continue;
1474                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1475                         j = prev_i;
1476                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1477                         int save_mode = file->mode;
1478                         /* Make sure that this directory doesn't duplicate a
1479                          * non-directory earlier in the list. */
1480                         flist->high = prev_i;
1481                         file->mode = S_IFREG;
1482                         j = flist_find(flist, file);
1483                         file->mode = save_mode;
1484                 } else
1485                         j = -1;
1486                 if (j >= 0) {
1487                         struct file_struct *fp = flist->files[j];
1488                         int keep, drop;
1489                         /* If one is a dir and the other is not, we want to
1490                          * keep the dir because it might have contents in the
1491                          * list. */
1492                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1493                                 if (S_ISDIR(file->mode))
1494                                         keep = i, drop = j;
1495                                 else
1496                                         keep = j, drop = i;
1497                         } else
1498                                 keep = j, drop = i;
1499                         if (verbose > 1 && !am_server) {
1500                                 rprintf(FINFO,
1501                                         "removing duplicate name %s from file list (%d)\n",
1502                                         safe_fname(f_name(file)), drop);
1503                         }
1504                         /* Make sure that if we unduplicate '.', that we don't
1505                          * lose track of a user-specified top directory. */
1506                         if (flist->files[drop]->flags & FLAG_TOP_DIR)
1507                                 flist->files[keep]->flags |= FLAG_TOP_DIR;
1508
1509                         clear_file(drop, flist);
1510
1511                         if (keep == i) {
1512                                 if (flist->low == drop) {
1513                                         for (j = drop + 1;
1514                                              j < i && !flist->files[j]->basename;
1515                                              j++) {}
1516                                         flist->low = j;
1517                                 }
1518                                 prev_i = i;
1519                         }
1520                 } else
1521                         prev_i = i;
1522         }
1523         flist->high = no_dups ? prev_i : flist->count - 1;
1524
1525         if (strip_root) {
1526                 /* We need to strip off the leading slashes for relative
1527                  * paths, but this must be done _after_ the sorting phase. */
1528                 for (i = flist->low; i <= flist->high; i++) {
1529                         struct file_struct *file = flist->files[i];
1530
1531                         if (!file->dirname)
1532                                 continue;
1533                         if (*file->dirname == '/') {
1534                                 char *s = file->dirname + 1;
1535                                 while (*s == '/') s++;
1536                                 memmove(file->dirname, s, strlen(s) + 1);
1537                         }
1538
1539                         if (!*file->dirname)
1540                                 file->dirname = NULL;
1541                 }
1542         }
1543 }
1544
1545 static void output_flist(struct file_list *flist, const char *whose_list)
1546 {
1547         char uidbuf[16], gidbuf[16], depthbuf[16];
1548         struct file_struct *file;
1549         int i;
1550
1551         for (i = 0; i < flist->count; i++) {
1552                 file = flist->files[i];
1553                 if ((am_root || am_sender) && preserve_uid)
1554                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1555                 else
1556                         *uidbuf = '\0';
1557                 if (preserve_gid && file->gid != GID_NONE)
1558                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1559                 else
1560                         *gidbuf = '\0';
1561                 if (!am_sender)
1562                         sprintf(depthbuf, "%d", file->dir.depth);
1563                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1564                         whose_list, i, am_sender ? NS(file->dir.root) : depthbuf,
1565                         file->dirname ? safe_fname(file->dirname) : "",
1566                         file->dirname ? "/" : "", NS(file->basename),
1567                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1568                         (double)file->length, uidbuf, gidbuf, file->flags);
1569         }
1570 }
1571
1572
1573 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1574 enum fnc_type { t_PATH, t_ITEM };
1575
1576 /* Compare the names of two file_struct entities, similar to how strcmp()
1577  * would do if it were operating on the joined strings.
1578  *
1579  * Some differences beginning with protocol_version 29: (1) directory names
1580  * are compared with an assumed trailing slash so that they compare in a
1581  * way that would cause them to sort immediately prior to any content they
1582  * may have; (2) a directory of any name compares after a non-directory of
1583  * any name at the same depth; (3) a directory with name "." compares prior
1584  * to anything else.  These changes mean that a directory and a non-dir
1585  * with the same name will not compare as equal (protocol_version >= 29).
1586  *
1587  * The dirname component can be an empty string, but the basename component
1588  * cannot (and never is in the current codebase).  The basename component
1589  * may be NULL (for a removed item), in which case it is considered to be
1590  * after any existing item. */
1591 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1592 {
1593         int dif;
1594         const uchar *c1, *c2;
1595         enum fnc_state state1, state2;
1596         enum fnc_type type1, type2;
1597         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1598
1599         if (!f1 || !f1->basename) {
1600                 if (!f2 || !f2->basename)
1601                         return 0;
1602                 return -1;
1603         }
1604         if (!f2 || !f2->basename)
1605                 return 1;
1606
1607         c1 = (uchar*)f1->dirname;
1608         c2 = (uchar*)f2->dirname;
1609         if (c1 == c2)
1610                 c1 = c2 = NULL;
1611         if (!c1) {
1612                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1613                 c1 = (uchar*)f1->basename;
1614                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1615                         type1 = t_ITEM;
1616                         state1 = s_TRAILING;
1617                         c1 = (uchar*)"";
1618                 } else
1619                         state1 = s_BASE;
1620         } else if (!*c1) {
1621                 type1 = t_path;
1622                 state1 = s_SLASH;
1623                 c1 = (uchar*)"/";
1624         } else {
1625                 type1 = t_path;
1626                 state1 = s_DIR;
1627         }
1628         if (!c2) {
1629                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1630                 c2 = (uchar*)f2->basename;
1631                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1632                         type2 = t_ITEM;
1633                         state2 = s_TRAILING;
1634                         c2 = (uchar*)"";
1635                 } else
1636                         state2 = s_BASE;
1637         } else if (!*c2) {
1638                 type2 = t_path;
1639                 state2 = s_SLASH;
1640                 c2 = (uchar*)"/";
1641         } else {
1642                 type2 = t_path;
1643                 state2 = s_DIR;
1644         }
1645
1646         if (type1 != type2)
1647                 return type1 == t_PATH ? 1 : -1;
1648
1649         while (1) {
1650                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1651                         break;
1652                 if (!*c1) {
1653                         switch (state1) {
1654                         case s_DIR:
1655                                 state1 = s_SLASH;
1656                                 c1 = (uchar*)"/";
1657                                 break;
1658                         case s_SLASH:
1659                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1660                                 state1 = s_BASE;
1661                                 c1 = (uchar*)f1->basename;
1662                                 break;
1663                         case s_BASE:
1664                                 state1 = s_TRAILING;
1665                                 if (type1 == t_PATH) {
1666                                         c1 = (uchar*)"/";
1667                                         break;
1668                                 }
1669                                 /* FALL THROUGH */
1670                         case s_TRAILING:
1671                                 type1 = t_ITEM;
1672                                 break;
1673                         }
1674                         if (*c2 && type1 != type2)
1675                                 return type1 == t_PATH ? 1 : -1;
1676                 }
1677                 if (!*c2) {
1678                         switch (state2) {
1679                         case s_DIR:
1680                                 if (state1 == s_SLASH && sorting_flist) {
1681                                         int j;
1682                                         /* Optimize for future comparisons. */
1683                                         for (j = 0;
1684                                              j < sorting_flist->count;
1685                                              j++) {
1686                                                 struct file_struct *fp
1687                                                     = sorting_flist->files[j];
1688                                                 if (fp->dirname == f2->dirname)
1689                                                         fp->dirname = f1->dirname;
1690                                         }
1691                                 }
1692                                 state2 = s_SLASH;
1693                                 c2 = (uchar*)"/";
1694                                 break;
1695                         case s_SLASH:
1696                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1697                                 state2 = s_BASE;
1698                                 c2 = (uchar*)f2->basename;
1699                                 break;
1700                         case s_BASE:
1701                                 state2 = s_TRAILING;
1702                                 if (type2 == t_PATH) {
1703                                         c2 = (uchar*)"/";
1704                                         break;
1705                                 }
1706                                 /* FALL THROUGH */
1707                         case s_TRAILING:
1708                                 if (!*c1)
1709                                         return 0;
1710                                 type2 = t_ITEM;
1711                                 break;
1712                         }
1713                         if (type1 != type2)
1714                                 return type1 == t_PATH ? 1 : -1;
1715                 }
1716         }
1717
1718         return dif;
1719 }
1720
1721
1722 /* Return a copy of the full filename of a flist entry, using the indicated
1723  * buffer.  No size-checking is done because we checked the size when creating
1724  * the file_struct entry.
1725  */
1726 char *f_name_to(struct file_struct *f, char *fbuf)
1727 {
1728         if (!f || !f->basename)
1729                 return NULL;
1730
1731         if (f->dirname) {
1732                 int len = strlen(f->dirname);
1733                 memcpy(fbuf, f->dirname, len);
1734                 fbuf[len] = '/';
1735                 strcpy(fbuf + len + 1, f->basename);
1736         } else
1737                 strcpy(fbuf, f->basename);
1738         return fbuf;
1739 }
1740
1741
1742 /* Like f_name_to(), but we rotate through 5 static buffers of our own. */
1743 char *f_name(struct file_struct *f)
1744 {
1745         static char names[5][MAXPATHLEN];
1746         static unsigned int n;
1747
1748         n = (n + 1) % (sizeof names / sizeof names[0]);
1749
1750         return f_name_to(f, names[n]);
1751 }
1752
1753
1754 struct file_list *get_dirlist(const char *dirname, int ignore_filter_rules)
1755 {
1756         struct file_list *dirlist;
1757         char dirbuf[MAXPATHLEN];
1758         int dlen;
1759         int save_recurse = recurse;
1760
1761         dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1762         if (dlen >= MAXPATHLEN)
1763                 return NULL;
1764
1765         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1766         recurse = 0;
1767         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirbuf, dlen);
1768         recurse = save_recurse;
1769
1770         return dirlist;
1771 }
1772
1773
1774 static int deletion_count = 0; /* used to implement --max-delete */
1775
1776 static int is_backup_file(char *fn)
1777 {
1778         int k = strlen(fn) - backup_suffix_len;
1779         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
1780 }
1781
1782
1783 /* Delete a file or directory.  If DEL_FORCE_RECURSE is set in the flags, or if
1784  * force_delete is set, this will delete recursively as long as DEL_NO_RECURSE
1785  * is not set in the flags. */
1786 int delete_file(char *fname, int mode, int flags)
1787 {
1788         struct file_list *dirlist;
1789         char buf[MAXPATHLEN];
1790         int j, zap_dir, ok;
1791
1792         if (max_delete && deletion_count >= max_delete)
1793                 return -1;
1794
1795         if (!S_ISDIR(mode)) {
1796                 if (make_backups && (backup_dir || !is_backup_file(fname)))
1797                         ok = make_backup(fname);
1798                 else
1799                         ok = robust_unlink(fname) == 0;
1800                 if (ok) {
1801                         if ((verbose || log_format) && !(flags & DEL_TERSE))
1802                                 log_delete(fname, mode);
1803                         deletion_count++;
1804                         return 0;
1805                 }
1806                 if (errno == ENOENT)
1807                         return 0;
1808                 rsyserr(FERROR, errno, "delete_file: unlink %s failed",
1809                         full_fname(fname));
1810                 return -1;
1811         }
1812
1813         zap_dir = (flags & DEL_FORCE_RECURSE || (force_delete && recurse))
1814                 && !(flags & DEL_NO_RECURSE);
1815         if (dry_run && zap_dir) {
1816                 ok = 0;
1817                 errno = ENOTEMPTY;
1818         } else if (make_backups && !backup_dir && !is_backup_file(fname)
1819             && !(flags & DEL_FORCE_RECURSE))
1820                 ok = make_backup(fname);
1821         else
1822                 ok = do_rmdir(fname) == 0;
1823         if (ok) {
1824                 if ((verbose || log_format) && !(flags & DEL_TERSE))
1825                         log_delete(fname, mode);
1826                 deletion_count++;
1827                 return 0;
1828         }
1829         if (errno == ENOENT)
1830                 return 0;
1831         if (!zap_dir || (errno != ENOTEMPTY && errno != EEXIST)) {
1832                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
1833                         full_fname(fname));
1834                 return -1;
1835         }
1836         flags |= DEL_FORCE_RECURSE;
1837
1838         dirlist = get_dirlist(fname, 0);
1839         for (j = dirlist->count; j-- > 0; ) {
1840                 struct file_struct *fp = dirlist->files[j];
1841                 f_name_to(fp, buf);
1842                 if (delete_file(buf, fp->mode, flags & ~DEL_TERSE) != 0) {
1843                         flist_free(dirlist);
1844                         return -1;
1845                 }
1846         }
1847         flist_free(dirlist);
1848
1849         if (max_delete && deletion_count >= max_delete)
1850                 return -1;
1851
1852         if (do_rmdir(fname) == 0) {
1853                 if ((verbose || log_format) && !(flags & DEL_TERSE))
1854                         log_delete(fname, mode);
1855                 deletion_count++;
1856         } else if (errno != ENOTEMPTY && errno != ENOENT) {
1857                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
1858                         full_fname(fname));
1859                 return -1;
1860         }
1861
1862         return 0;
1863 }
1864
1865
1866 /* If an item in dir_list is not found in full_list, delete it from the
1867  * filesystem. */
1868 static void delete_missing(struct file_list *full_list,
1869                            struct file_list *dir_list, const char *dirname)
1870 {
1871         char fbuf[MAXPATHLEN];
1872         int i;
1873
1874         if (max_delete && deletion_count >= max_delete)
1875                 return;
1876
1877         if (verbose > 2)
1878                 rprintf(FINFO, "delete_missing(%s)\n", safe_fname(dirname));
1879
1880         for (i = dir_list->count; i--; ) {
1881                 if (!dir_list->files[i]->basename)
1882                         continue;
1883                 if (flist_find(full_list, dir_list->files[i]) < 0) {
1884                         char *fn = f_name_to(dir_list->files[i], fbuf);
1885                         int mode = dir_list->files[i]->mode;
1886                         if (delete_file(fn, mode, DEL_FORCE_RECURSE) < 0)
1887                                 break;
1888                 }
1889         }
1890 }
1891
1892
1893 /* This function is used to implement per-directory deletion, and
1894  * is used by all the --delete-WHEN options.  Note that the fbuf
1895  * pointer must point to a MAXPATHLEN buffer with the name of the
1896  * directory in it (the functions we call will append names onto
1897  * the end, but the old dir value will be restored on exit). */
1898 void delete_in_dir(struct file_list *flist, char *fbuf,
1899                    struct file_struct *file)
1900 {
1901         static int min_depth = MAXPATHLEN, cur_depth = -1;
1902         static void *filt_array[MAXPATHLEN/2+1];
1903         struct file_list *dir_list;
1904         STRUCT_STAT st;
1905         int dlen;
1906
1907         if (!flist) {
1908                 while (cur_depth >= min_depth)
1909                         pop_local_filters(filt_array[cur_depth--]);
1910                 min_depth = MAXPATHLEN;
1911                 cur_depth = -1;
1912                 return;
1913         }
1914         if (file->dir.depth >= MAXPATHLEN/2+1)
1915                 return; /* Impossible... */
1916
1917         if (max_delete && deletion_count >= max_delete)
1918                 return;
1919
1920         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
1921                 rprintf(FINFO,
1922                         "IO error encountered -- skipping file deletion\n");
1923                 max_delete = -1; /* avoid duplicating the above warning */
1924                 return;
1925         }
1926
1927         while (cur_depth >= file->dir.depth && cur_depth >= min_depth)
1928                 pop_local_filters(filt_array[cur_depth--]);
1929         cur_depth = file->dir.depth;
1930         if (min_depth > cur_depth)
1931                 min_depth = cur_depth;
1932         dlen = strlen(fbuf);
1933         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
1934
1935         if (link_stat(fbuf, &st, keep_dirlinks) < 0)
1936                 return;
1937
1938         if (one_file_system && file->flags & FLAG_TOP_DIR)
1939                 filesystem_dev = st.st_dev;
1940
1941         dir_list = flist_new(WITHOUT_HLINK, "delete_in_dir");
1942
1943         recurse = 0;
1944         send_directory(-1, dir_list, fbuf, dlen);
1945         recurse = -1;
1946         fbuf[dlen] = '\0';
1947
1948         if (verbose > 3)
1949                 output_flist(dir_list, "delete");
1950
1951         delete_missing(flist, dir_list, fbuf);
1952
1953         flist_free(dir_list);
1954 }