Moved an extern.
[rsync/rsync.git] / flist.c
1 /*
2  * Generate and receive file lists.
3  *
4  * Copyright (C) 1996 Andrew Tridgell
5  * Copyright (C) 1996 Paul Mackerras
6  * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
7  * Copyright (C) 2002, 2003, 2004, 2005, 2006 Wayne Davison
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License along
20  * with this program; if not, write to the Free Software Foundation, Inc.,
21  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
22  */
23
24 #include "rsync.h"
25
26 extern int verbose;
27 extern int list_only;
28 extern int am_root;
29 extern int am_server;
30 extern int am_daemon;
31 extern int am_sender;
32 extern int do_progress;
33 extern int always_checksum;
34 extern int module_id;
35 extern int ignore_errors;
36 extern int numeric_ids;
37 extern int recurse;
38 extern int xfer_dirs;
39 extern int filesfrom_fd;
40 extern int one_file_system;
41 extern int copy_dirlinks;
42 extern int keep_dirlinks;
43 extern int preserve_links;
44 extern int preserve_hard_links;
45 extern int preserve_devices;
46 extern int preserve_specials;
47 extern int preserve_uid;
48 extern int preserve_gid;
49 extern int relative_paths;
50 extern int implied_dirs;
51 extern int flist_extra_ndx;
52 extern int ignore_perishable;
53 extern int non_perishable_cnt;
54 extern int prune_empty_dirs;
55 extern int copy_links;
56 extern int copy_unsafe_links;
57 extern int protocol_version;
58 extern int sanitize_paths;
59 extern struct stats stats;
60 extern struct file_list *the_file_list;
61
62 extern char curr_dir[MAXPATHLEN];
63
64 extern struct chmod_mode_struct *chmod_modes;
65
66 extern struct filter_list_struct filter_list;
67 extern struct filter_list_struct server_filter_list;
68
69 int io_error;
70 int checksum_len;
71 dev_t filesystem_dev; /* used to implement -x */
72 int file_struct_len;
73
74 /* The tmp_* vars are used as a cache area by make_file() to store data
75  * that the sender doesn't need to remember in its file list.  The data
76  * will survive just long enough to be used by send_file_entry(). */
77 static dev_t tmp_rdev;
78 static struct idev tmp_idev;
79 static char tmp_sum[MD4_SUM_LENGTH];
80
81 static char empty_sum[MD4_SUM_LENGTH];
82 static int flist_count_offset;
83
84 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
85 static void output_flist(struct file_list *flist);
86
87 void init_flist(void)
88 {
89         struct file_struct f;
90
91         /* Figure out how big the file_struct is without trailing padding */
92         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
93         checksum_len = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
94 }
95
96 static int show_filelist_p(void)
97 {
98         return verbose && xfer_dirs && !am_server;
99 }
100
101 static void start_filelist_progress(char *kind)
102 {
103         rprintf(FCLIENT, "%s ... ", kind);
104         if (verbose > 1 || do_progress)
105                 rprintf(FCLIENT, "\n");
106         rflush(FINFO);
107 }
108
109 static void emit_filelist_progress(int count)
110 {
111         rprintf(FCLIENT, " %d files...\r", count);
112 }
113
114 static void maybe_emit_filelist_progress(int count)
115 {
116         if (do_progress && show_filelist_p() && (count % 100) == 0)
117                 emit_filelist_progress(count);
118 }
119
120 static void finish_filelist_progress(const struct file_list *flist)
121 {
122         if (do_progress) {
123                 /* This overwrites the progress line */
124                 rprintf(FINFO, "%d file%sto consider\n",
125                         flist->count, flist->count == 1 ? " " : "s ");
126         } else
127                 rprintf(FINFO, "done\n");
128 }
129
130 void show_flist_stats(void)
131 {
132         /* Nothing yet */
133 }
134
135 static void list_file_entry(struct file_struct *f)
136 {
137         char permbuf[PERMSTRING_SIZE];
138
139         if (!f->basename) {
140                 /* this can happen if duplicate names were removed */
141                 return;
142         }
143
144         permstring(permbuf, f->mode);
145
146 #ifdef SUPPORT_LINKS
147         if (preserve_links && S_ISLNK(f->mode)) {
148                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
149                         permbuf,
150                         (double)f->length, timestring(f->modtime),
151                         f_name(f, NULL), F_SYMLINK(f));
152         } else
153 #endif
154         {
155                 rprintf(FINFO, "%s %11.0f %s %s\n",
156                         permbuf,
157                         (double)f->length, timestring(f->modtime),
158                         f_name(f, NULL));
159         }
160 }
161
162 /* Stat either a symlink or its referent, depending on the settings of
163  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
164  *
165  * If path is the name of a symlink, then the linkbuf buffer (which must hold
166  * MAXPATHLEN chars) will be set to the symlink's target string.
167  *
168  * The stat structure pointed to by stp will contain information about the
169  * link or the referent as appropriate, if they exist. */
170 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
171 {
172 #ifdef SUPPORT_LINKS
173         if (link_stat(path, stp, copy_dirlinks) < 0)
174                 return -1;
175         if (S_ISLNK(stp->st_mode)) {
176                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
177                 if (llen < 0)
178                         return -1;
179                 linkbuf[llen] = '\0';
180                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
181                         if (verbose > 1) {
182                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
183                                         path, linkbuf);
184                         }
185                         return do_stat(path, stp);
186                 }
187         }
188         return 0;
189 #else
190         return do_stat(path, stp);
191 #endif
192 }
193
194 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
195 {
196 #ifdef SUPPORT_LINKS
197         if (copy_links)
198                 return do_stat(path, stp);
199         if (do_lstat(path, stp) < 0)
200                 return -1;
201         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
202                 STRUCT_STAT st;
203                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
204                         *stp = st;
205         }
206         return 0;
207 #else
208         return do_stat(path, stp);
209 #endif
210 }
211
212 /* This function is used to check if a file should be included/excluded
213  * from the list of files based on its name and type etc.  The value of
214  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
215 static int is_excluded(char *fname, int is_dir, int filter_level)
216 {
217 #if 0 /* This currently never happens, so avoid a useless compare. */
218         if (filter_level == NO_FILTERS)
219                 return 0;
220 #endif
221         if (fname) {
222                 /* never exclude '.', even if somebody does --exclude '*' */
223                 if (fname[0] == '.' && !fname[1])
224                         return 0;
225                 /* Handle the -R version of the '.' dir. */
226                 if (fname[0] == '/') {
227                         int len = strlen(fname);
228                         if (fname[len-1] == '.' && fname[len-2] == '/')
229                                 return 0;
230                 }
231         }
232         if (server_filter_list.head
233             && check_filter(&server_filter_list, fname, is_dir) < 0)
234                 return 1;
235         if (filter_level != ALL_FILTERS)
236                 return 0;
237         if (filter_list.head
238             && check_filter(&filter_list, fname, is_dir) < 0)
239                 return 1;
240         return 0;
241 }
242
243 static int to_wire_mode(mode_t mode)
244 {
245 #ifdef SUPPORT_LINKS
246 #if _S_IFLNK != 0120000
247         if (S_ISLNK(mode))
248                 return (mode & ~(_S_IFMT)) | 0120000;
249 #endif
250 #endif
251         return mode;
252 }
253
254 static mode_t from_wire_mode(int mode)
255 {
256 #if _S_IFLNK != 0120000
257         if ((mode & (_S_IFMT)) == 0120000)
258                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
259 #endif
260         return mode;
261 }
262
263 static void send_directory(int f, struct file_list *flist,
264                            char *fbuf, int len);
265
266 static const char *flist_dir;
267 static int flist_dir_len;
268
269
270 /**
271  * Make sure @p flist is big enough to hold at least @p flist->count
272  * entries.
273  **/
274 void flist_expand(struct file_list *flist)
275 {
276         struct file_struct **new_ptr;
277
278         if (flist->count < flist->malloced)
279                 return;
280
281         if (flist->malloced < FLIST_START)
282                 flist->malloced = FLIST_START;
283         else if (flist->malloced >= FLIST_LINEAR)
284                 flist->malloced += FLIST_LINEAR;
285         else
286                 flist->malloced *= 2;
287
288         /*
289          * In case count jumped or we are starting the list
290          * with a known size just set it.
291          */
292         if (flist->malloced < flist->count)
293                 flist->malloced = flist->count;
294
295         new_ptr = realloc_array(flist->files, struct file_struct *,
296                                 flist->malloced);
297
298         if (verbose >= 2 && flist->malloced != FLIST_START) {
299                 rprintf(FCLIENT, "[%s] expand file_list to %.0f bytes, did%s move\n",
300                     who_am_i(),
301                     (double)sizeof flist->files[0] * flist->malloced,
302                     (new_ptr == flist->files) ? " not" : "");
303         }
304
305         flist->files = new_ptr;
306
307         if (!flist->files)
308                 out_of_memory("flist_expand");
309 }
310
311 static void send_file_entry(struct file_struct *file, int f)
312 {
313         unsigned short flags;
314         static time_t modtime;
315         static mode_t mode;
316         static int64 dev;
317         static dev_t rdev;
318         static uint32 rdev_major;
319         static uid_t uid;
320         static gid_t gid;
321         static char lastname[MAXPATHLEN];
322         char fname[MAXPATHLEN];
323         int l1, l2;
324
325         if (f < 0)
326                 return;
327
328         if (!file) {
329                 write_byte(f, 0);
330                 modtime = 0, mode = 0;
331                 dev = 0, rdev = MAKEDEV(0, 0);
332                 rdev_major = 0;
333                 uid = 0, gid = 0;
334                 *lastname = '\0';
335                 return;
336         }
337
338         f_name(file, fname);
339
340         flags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
341
342         if (file->mode == mode)
343                 flags |= XMIT_SAME_MODE;
344         else
345                 mode = file->mode;
346         if ((preserve_devices && IS_DEVICE(mode))
347          || (preserve_specials && IS_SPECIAL(mode))) {
348                 if (protocol_version < 28) {
349                         if (tmp_rdev == rdev)
350                                 flags |= XMIT_SAME_RDEV_pre28;
351                         else
352                                 rdev = tmp_rdev;
353                 } else {
354                         rdev = tmp_rdev;
355                         if ((uint32)major(rdev) == rdev_major)
356                                 flags |= XMIT_SAME_RDEV_MAJOR;
357                         else
358                                 rdev_major = major(rdev);
359                         if ((uint32)minor(rdev) <= 0xFFu)
360                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
361                 }
362         } else if (protocol_version < 28)
363                 rdev = MAKEDEV(0, 0);
364         if (preserve_uid) {
365                 if (F_UID(file) == uid)
366                         flags |= XMIT_SAME_UID;
367                 else
368                         uid = F_UID(file);
369         }
370         if (preserve_gid) {
371                 if (F_GID(file) == gid)
372                         flags |= XMIT_SAME_GID;
373                 else
374                         gid = F_GID(file);
375         }
376         if (file->modtime == modtime)
377                 flags |= XMIT_SAME_TIME;
378         else
379                 modtime = file->modtime;
380
381 #ifdef SUPPORT_HARD_LINKS
382         if (tmp_idev.dev != 0) {
383                 if (tmp_idev.dev == dev) {
384                         if (protocol_version >= 28)
385                                 flags |= XMIT_SAME_DEV;
386                 } else
387                         dev = tmp_idev.dev;
388                 flags |= XMIT_HAS_IDEV_DATA;
389         }
390 #endif
391
392         for (l1 = 0;
393             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
394             l1++) {}
395         l2 = strlen(fname+l1);
396
397         if (l1 > 0)
398                 flags |= XMIT_SAME_NAME;
399         if (l2 > 255)
400                 flags |= XMIT_LONG_NAME;
401
402         /* We must make sure we don't send a zero flag byte or the
403          * other end will terminate the flist transfer.  Note that
404          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
405          * it's harmless way to add a bit to the first flag byte. */
406         if (protocol_version >= 28) {
407                 if (!flags && !S_ISDIR(mode))
408                         flags |= XMIT_TOP_DIR;
409                 if ((flags & 0xFF00) || !flags) {
410                         flags |= XMIT_EXTENDED_FLAGS;
411                         write_shortint(f, flags);
412                 } else
413                         write_byte(f, flags);
414         } else {
415                 if (!(flags & 0xFF))
416                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
417                 write_byte(f, flags);
418         }
419         if (flags & XMIT_SAME_NAME)
420                 write_byte(f, l1);
421         if (flags & XMIT_LONG_NAME)
422                 write_int(f, l2);
423         else
424                 write_byte(f, l2);
425         write_buf(f, fname + l1, l2);
426
427         write_longint(f, file->length);
428         if (!(flags & XMIT_SAME_TIME))
429                 write_int(f, modtime);
430         if (!(flags & XMIT_SAME_MODE))
431                 write_int(f, to_wire_mode(mode));
432         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
433                 if (!numeric_ids)
434                         add_uid(uid);
435                 write_int(f, uid);
436         }
437         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
438                 if (!numeric_ids)
439                         add_gid(gid);
440                 write_int(f, gid);
441         }
442         if ((preserve_devices && IS_DEVICE(mode))
443          || (preserve_specials && IS_SPECIAL(mode))) {
444                 if (protocol_version < 28) {
445                         if (!(flags & XMIT_SAME_RDEV_pre28))
446                                 write_int(f, (int)rdev);
447                 } else {
448                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
449                                 write_int(f, major(rdev));
450                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
451                                 write_byte(f, minor(rdev));
452                         else
453                                 write_int(f, minor(rdev));
454                 }
455         }
456
457 #ifdef SUPPORT_LINKS
458         if (preserve_links && S_ISLNK(mode)) {
459                 const char *sl = F_SYMLINK(file);
460                 int len = strlen(sl);
461                 write_int(f, len);
462                 write_buf(f, sl, len);
463         }
464 #endif
465
466 #ifdef SUPPORT_HARD_LINKS
467         if (tmp_idev.dev != 0) {
468                 if (protocol_version < 26) {
469                         /* 32-bit dev_t and ino_t */
470                         write_int(f, (int32)dev);
471                         write_int(f, (int32)tmp_idev.ino);
472                 } else {
473                         /* 64-bit dev_t and ino_t */
474                         if (!(flags & XMIT_SAME_DEV))
475                                 write_longint(f, dev);
476                         write_longint(f, tmp_idev.ino);
477                 }
478         }
479 #endif
480
481         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
482                 const char *sum;
483                 if (S_ISREG(mode))
484                         sum = tmp_sum;
485                 else {
486                         /* Prior to 28, we sent a useless set of nulls. */
487                         sum = empty_sum;
488                 }
489                 write_buf(f, sum, checksum_len);
490         }
491
492         strlcpy(lastname, fname, MAXPATHLEN);
493 }
494
495 static struct file_struct *recv_file_entry(struct file_list *flist,
496                                            unsigned short flags, int f)
497 {
498         static time_t modtime;
499         static mode_t mode;
500         static int64 dev;
501         static dev_t rdev;
502         static uint32 rdev_major;
503         static uid_t uid;
504         static gid_t gid;
505         static char lastname[MAXPATHLEN], *lastdir;
506         static int lastdir_depth, lastdir_len = -1;
507         static unsigned int del_hier_name_len = 0;
508         static int in_del_hier = 0;
509         char thisname[MAXPATHLEN];
510         unsigned int l1 = 0, l2 = 0;
511         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
512         int extra_len = (flist_extra_ndx-1) * sizeof (union flist_extras);
513         OFF_T file_length;
514         char *basename, *dirname, *bp;
515         struct file_struct *file;
516
517         if (!flist) {
518                 modtime = 0, mode = 0;
519                 dev = 0, rdev = MAKEDEV(0, 0);
520                 rdev_major = 0;
521                 uid = 0, gid = 0;
522                 *lastname = '\0';
523                 lastdir_len = -1;
524                 in_del_hier = 0;
525                 return NULL;
526         }
527
528         if (flags & XMIT_SAME_NAME)
529                 l1 = read_byte(f);
530
531         if (flags & XMIT_LONG_NAME)
532                 l2 = read_int(f);
533         else
534                 l2 = read_byte(f);
535
536         if (l2 >= MAXPATHLEN - l1) {
537                 rprintf(FERROR,
538                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
539                         flags, l1, l2, lastname, who_am_i());
540                 overflow_exit("recv_file_entry");
541         }
542
543         strlcpy(thisname, lastname, l1 + 1);
544         read_sbuf(f, &thisname[l1], l2);
545         thisname[l1 + l2] = 0;
546
547         strlcpy(lastname, thisname, MAXPATHLEN);
548
549         clean_fname(thisname, 0);
550
551         if (sanitize_paths)
552                 sanitize_path(thisname, thisname, "", 0, NULL);
553
554         if ((basename = strrchr(thisname, '/')) != NULL) {
555                 dirname_len = ++basename - thisname; /* counts future '\0' */
556                 if (lastdir_len == dirname_len - 1
557                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
558                         dirname = lastdir;
559                         dirname_len = 0; /* indicates no copy is needed */
560                 } else
561                         dirname = thisname;
562         } else {
563                 basename = thisname;
564                 dirname = NULL;
565                 dirname_len = 0;
566         }
567         basename_len = strlen(basename) + 1; /* count the '\0' */
568
569         file_length = read_longint(f);
570         if (!(flags & XMIT_SAME_TIME))
571                 modtime = (time_t)read_int(f);
572         if (!(flags & XMIT_SAME_MODE))
573                 mode = from_wire_mode(read_int(f));
574
575         if (chmod_modes && !S_ISLNK(mode))
576                 mode = tweak_mode(mode, chmod_modes);
577
578         if (preserve_uid && !(flags & XMIT_SAME_UID))
579                 uid = (uid_t)read_int(f);
580         if (preserve_gid && !(flags & XMIT_SAME_GID))
581                 gid = (gid_t)read_int(f);
582
583         if ((preserve_devices && IS_DEVICE(mode))
584          || (preserve_specials && IS_SPECIAL(mode))) {
585                 if (protocol_version < 28) {
586                         if (!(flags & XMIT_SAME_RDEV_pre28))
587                                 rdev = (dev_t)read_int(f);
588                 } else {
589                         uint32 rdev_minor;
590                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
591                                 rdev_major = read_int(f);
592                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
593                                 rdev_minor = read_byte(f);
594                         else
595                                 rdev_minor = read_int(f);
596                         rdev = MAKEDEV(rdev_major, rdev_minor);
597                 }
598                 extra_len += 2 * sizeof (union flist_extras);
599         } else if (protocol_version < 28)
600                 rdev = MAKEDEV(0, 0);
601
602 #ifdef SUPPORT_LINKS
603         if (preserve_links && S_ISLNK(mode)) {
604                 linkname_len = read_int(f) + 1; /* count the '\0' */
605                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
606                         rprintf(FERROR, "overflow: linkname_len=%d\n",
607                                 linkname_len - 1);
608                         overflow_exit("recv_file_entry");
609                 }
610         }
611         else
612 #endif
613                 linkname_len = 0;
614
615 #ifdef SUPPORT_HARD_LINKS
616         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
617                 flags |= XMIT_HAS_IDEV_DATA;
618         if (flags & XMIT_HAS_IDEV_DATA) {
619                 extra_len += sizeof (union flist_extras);
620                 assert(flist->hlink_pool != NULL);
621         }
622 #endif
623
624         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
625
626         alloc_len = file_struct_len + dirname_len + basename_len
627                   + linkname_len + sum_len + extra_len;
628         bp = pool_alloc(flist->file_pool, alloc_len, "recv_file_entry");
629
630         memset(bp, 0, file_struct_len + extra_len);
631         bp += extra_len;
632         file = (struct file_struct *)bp;
633         bp += file_struct_len + linkname_len + sum_len;
634
635 #ifdef SUPPORT_HARD_LINKS
636         if (flags & XMIT_HAS_IDEV_DATA)
637                 file->flags |= FLAG_HLINK_INFO;
638 #endif
639         file->modtime = modtime;
640         file->length = file_length;
641         file->mode = mode;
642         if (preserve_uid)
643                 F_UID(file) = uid;
644         if (preserve_gid)
645                 F_GID(file) = gid;
646
647         if (dirname_len) {
648                 file->dirname = lastdir = bp;
649                 lastdir_len = dirname_len - 1;
650                 memcpy(bp, dirname, dirname_len - 1);
651                 bp += dirname_len;
652                 bp[-1] = '\0';
653                 lastdir_depth = count_dir_elements(lastdir);
654                 file->dir.depth = lastdir_depth + 1;
655         } else if (dirname) {
656                 file->dirname = dirname; /* we're reusing lastname */
657                 file->dir.depth = lastdir_depth + 1;
658         } else
659                 file->dir.depth = 1;
660
661         if (S_ISDIR(mode)) {
662                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
663                         file->dir.depth--;
664                 if (flags & XMIT_TOP_DIR) {
665                         in_del_hier = recurse;
666                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
667                         if (relative_paths && del_hier_name_len > 2
668                             && lastname[del_hier_name_len-1] == '.'
669                             && lastname[del_hier_name_len-2] == '/')
670                                 del_hier_name_len -= 2;
671                         file->flags |= FLAG_TOP_DIR | FLAG_XFER_DIR;
672                 } else if (in_del_hier) {
673                         if (!relative_paths || !del_hier_name_len
674                          || (l1 >= del_hier_name_len
675                           && lastname[del_hier_name_len] == '/'))
676                                 file->flags |= FLAG_XFER_DIR;
677                         else
678                                 in_del_hier = 0;
679                 }
680         }
681
682         file->basename = bp;
683         memcpy(bp, basename, basename_len);
684         bp += basename_len;
685
686         if ((preserve_devices && IS_DEVICE(mode))
687          || (preserve_specials && IS_SPECIAL(mode))) {
688                 F_DMAJOR(file) = major(rdev);
689                 F_DMINOR(file) = minor(rdev);
690         }
691
692 #ifdef SUPPORT_LINKS
693         if (linkname_len) {
694                 bp = F_SYMLINK(file);
695                 read_sbuf(f, bp, linkname_len - 1);
696                 if (sanitize_paths)
697                         sanitize_path(bp, bp, "", lastdir_depth, NULL);
698         }
699 #endif
700
701 #ifdef SUPPORT_HARD_LINKS
702         if (flags & XMIT_HAS_IDEV_DATA) {
703                 struct idev *idevp = pool_talloc(flist->hlink_pool, struct idev,
704                                                  1, "inode_table");
705                 F_IDEV(file) = idevp;
706                 if (protocol_version < 26) {
707                         idevp->dev = read_int(f);
708                         idevp->ino = read_int(f);
709                 } else {
710                         if (!(flags & XMIT_SAME_DEV))
711                                 dev = read_longint(f);
712                         idevp->dev = dev;
713                         idevp->ino = read_longint(f);
714                 }
715         }
716 #endif
717
718         if (always_checksum && (sum_len || protocol_version < 28)) {
719                 if (sum_len)
720                         bp = F_SUM(file);
721                 else {
722                         /* Prior to 28, we get a useless set of nulls. */
723                         bp = tmp_sum;
724                 }
725                 read_buf(f, bp, checksum_len);
726         }
727
728         return file;
729 }
730
731 /**
732  * Create a file_struct for a named file by reading its stat()
733  * information and performing extensive checks against global
734  * options.
735  *
736  * @return the new file, or NULL if there was an error or this file
737  * should be excluded.
738  *
739  * @todo There is a small optimization opportunity here to avoid
740  * stat()ing the file in some circumstances, which has a certain cost.
741  * We are called immediately after doing readdir(), and so we may
742  * already know the d_type of the file.  We could for example avoid
743  * statting directories if we're not recursing, but this is not a very
744  * important case.  Some systems may not have d_type.
745  **/
746 struct file_struct *make_file(const char *fname, struct file_list *flist,
747                               STRUCT_STAT *stp, int flags, int filter_level)
748 {
749         static char *lastdir;
750         static int lastdir_len = -1;
751         struct file_struct *file;
752         STRUCT_STAT st;
753         char thisname[MAXPATHLEN];
754         char linkname[MAXPATHLEN];
755         int alloc_len, basename_len, dirname_len, linkname_len;
756         int extra_len = (flist_extra_ndx-1) * sizeof (union flist_extras);
757         char *basename, *dirname, *bp;
758
759         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
760                 lastdir_len = -1;
761
762         if (strlcpy(thisname, fname, sizeof thisname)
763             >= sizeof thisname - flist_dir_len) {
764                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
765                 return NULL;
766         }
767         clean_fname(thisname, 0);
768         if (sanitize_paths)
769                 sanitize_path(thisname, thisname, "", 0, NULL);
770
771         if (stp && S_ISDIR(stp->st_mode)) {
772                 st = *stp; /* Needed for "symlink/." with --relative. */
773                 *linkname = '\0'; /* make IBM code checker happy */
774         } else if (readlink_stat(thisname, &st, linkname) != 0) {
775                 int save_errno = errno;
776                 /* See if file is excluded before reporting an error. */
777                 if (filter_level != NO_FILTERS
778                  && (is_excluded(thisname, 0, filter_level)
779                   || is_excluded(thisname, 1, filter_level))) {
780                         if (ignore_perishable && save_errno != ENOENT)
781                                 non_perishable_cnt++;
782                         return NULL;
783                 }
784                 if (save_errno == ENOENT) {
785 #ifdef SUPPORT_LINKS
786                         /* Avoid "vanished" error if symlink points nowhere. */
787                         if (copy_links && do_lstat(thisname, &st) == 0
788                             && S_ISLNK(st.st_mode)) {
789                                 io_error |= IOERR_GENERAL;
790                                 rprintf(FERROR, "symlink has no referent: %s\n",
791                                         full_fname(thisname));
792                         } else
793 #endif
794                         {
795                                 enum logcode c = am_daemon && protocol_version < 28
796                                     ? FERROR : FINFO;
797                                 io_error |= IOERR_VANISHED;
798                                 rprintf(c, "file has vanished: %s\n",
799                                         full_fname(thisname));
800                         }
801                 } else {
802                         io_error |= IOERR_GENERAL;
803                         rsyserr(FERROR, save_errno, "readlink %s failed",
804                                 full_fname(thisname));
805                 }
806                 return NULL;
807         }
808
809         /* backup.c calls us with filter_level set to NO_FILTERS. */
810         if (filter_level == NO_FILTERS)
811                 goto skip_filters;
812
813         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
814                 rprintf(FINFO, "skipping directory %s\n", thisname);
815                 return NULL;
816         }
817
818         /* -x only affects directories because we need to avoid recursing
819          * into a mount-point directory, not to avoid copying a symlinked
820          * file if -L (or similar) was specified. */
821         if (one_file_system && st.st_dev != filesystem_dev
822          && S_ISDIR(st.st_mode)) {
823                 if (one_file_system > 1) {
824                         if (verbose > 2) {
825                                 rprintf(FINFO, "skipping mount-point dir %s\n",
826                                         thisname);
827                         }
828                         return NULL;
829                 }
830                 flags |= FLAG_MOUNT_DIR;
831         }
832
833         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
834                 if (ignore_perishable)
835                         non_perishable_cnt++;
836                 return NULL;
837         }
838
839         if (lp_ignore_nonreadable(module_id)) {
840 #ifdef SUPPORT_LINKS
841                 if (!S_ISLNK(st.st_mode))
842 #endif
843                         if (access(thisname, R_OK) != 0)
844                                 return NULL;
845         }
846
847   skip_filters:
848
849         if (verbose > 2) {
850                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
851                         who_am_i(), thisname, filter_level);
852         }
853
854         if ((basename = strrchr(thisname, '/')) != NULL) {
855                 dirname_len = ++basename - thisname; /* counts future '\0' */
856                 if (lastdir_len == dirname_len - 1
857                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
858                         dirname = lastdir;
859                         dirname_len = 0; /* indicates no copy is needed */
860                 } else
861                         dirname = thisname;
862         } else {
863                 basename = thisname;
864                 dirname = NULL;
865                 dirname_len = 0;
866         }
867         basename_len = strlen(basename) + 1; /* count the '\0' */
868
869 #ifdef SUPPORT_LINKS
870         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
871 #else
872         linkname_len = 0;
873 #endif
874
875         alloc_len = file_struct_len + dirname_len + basename_len
876                   + linkname_len + extra_len;
877         if (flist)
878                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
879         else {
880                 if (!(bp = new_array(char, alloc_len)))
881                         out_of_memory("make_file");
882         }
883
884         memset(bp, 0, file_struct_len + extra_len);
885         bp += extra_len;
886         file = (struct file_struct *)bp;
887         bp += file_struct_len + linkname_len;
888
889 #ifdef SUPPORT_HARD_LINKS
890         if (preserve_hard_links && flist) {
891                 if (protocol_version >= 28
892                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
893                  : S_ISREG(st.st_mode)) {
894                         tmp_idev.dev = st.st_dev;
895                         tmp_idev.ino = st.st_ino;
896                 } else
897                         tmp_idev.dev = tmp_idev.ino = 0;
898         }
899 #endif
900
901         file->flags = flags;
902         file->modtime = st.st_mtime;
903         file->length = st.st_size;
904         file->mode = st.st_mode;
905         if (preserve_uid)
906                 F_UID(file) = st.st_uid;
907         if (preserve_gid)
908                 F_GID(file) = st.st_gid;
909
910         if (dirname_len) {
911                 file->dirname = lastdir = bp;
912                 lastdir_len = dirname_len - 1;
913                 memcpy(bp, dirname, dirname_len - 1);
914                 bp += dirname_len;
915                 bp[-1] = '\0';
916         } else if (dirname)
917                 file->dirname = dirname;
918
919         file->basename = bp;
920         memcpy(bp, basename, basename_len);
921         bp += basename_len;
922
923 #ifdef HAVE_STRUCT_STAT_ST_RDEV
924         if ((preserve_devices && IS_DEVICE(st.st_mode))
925          || (preserve_specials && IS_SPECIAL(st.st_mode)))
926                 tmp_rdev = st.st_rdev;
927 #endif
928
929 #ifdef SUPPORT_LINKS
930         if (linkname_len)
931                 memcpy(F_SYMLINK(file), linkname, linkname_len);
932 #endif
933
934         if (always_checksum && am_sender && S_ISREG(st.st_mode))
935                 file_checksum(thisname, tmp_sum, st.st_size);
936
937         file->dir.root = flist_dir;
938
939         /* This code is only used by the receiver when it is building
940          * a list of files for a delete pass. */
941         if (keep_dirlinks && linkname_len && flist) {
942                 STRUCT_STAT st2;
943                 int save_mode = file->mode;
944                 file->mode = S_IFDIR; /* Find a directory with our name. */
945                 if (flist_find(the_file_list, file) >= 0
946                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
947                         file->modtime = st2.st_mtime;
948                         file->length = st2.st_size;
949                         file->mode = st2.st_mode;
950                         if (preserve_uid)
951                                 F_UID(file) = st2.st_uid;
952                         if (preserve_gid)
953                                 F_GID(file) = st2.st_gid;
954                 } else
955                         file->mode = save_mode;
956         }
957
958         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
959                 stats.total_size += st.st_size;
960
961         if (basename_len == 0+1)
962                 return NULL;
963
964         return file;
965 }
966
967 /* Only called for temporary file_struct entries. */
968 void unmake_file(struct file_struct *file)
969 {
970         union flist_extras *start = (union flist_extras *)file
971                                   - (flist_extra_ndx - 1);
972         free(start);
973 }
974
975 static struct file_struct *send_file_name(int f, struct file_list *flist,
976                                           char *fname, STRUCT_STAT *stp,
977                                           unsigned short flags)
978 {
979         struct file_struct *file;
980
981         file = make_file(fname, flist, stp, flags,
982                          f == -2 ? SERVER_FILTERS : ALL_FILTERS);
983         if (!file)
984                 return NULL;
985
986         if (chmod_modes && !S_ISLNK(file->mode))
987                 file->mode = tweak_mode(file->mode, chmod_modes);
988
989         maybe_emit_filelist_progress(flist->count + flist_count_offset);
990
991         flist_expand(flist);
992         flist->files[flist->count++] = file;
993         send_file_entry(file, f);
994         return file;
995 }
996
997 static void send_if_directory(int f, struct file_list *flist,
998                               struct file_struct *file,
999                               char *fbuf, unsigned int ol)
1000 {
1001         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1002
1003         if (S_ISDIR(file->mode)
1004             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1005                 void *save_filters;
1006                 unsigned int len = strlen(fbuf);
1007                 if (len > 1 && fbuf[len-1] == '/')
1008                         fbuf[--len] = '\0';
1009                 if (len >= MAXPATHLEN - 1) {
1010                         io_error |= IOERR_GENERAL;
1011                         rprintf(FERROR, "skipping long-named directory: %s\n",
1012                                 full_fname(fbuf));
1013                         return;
1014                 }
1015                 save_filters = push_local_filters(fbuf, len);
1016                 send_directory(f, flist, fbuf, len);
1017                 pop_local_filters(save_filters);
1018                 fbuf[ol] = '\0';
1019                 if (is_dot_dir)
1020                         fbuf[ol-1] = '.';
1021         }
1022 }
1023
1024 /* This function is normally called by the sender, but the receiving side also
1025  * calls it from get_dirlist() with f set to -1 so that we just construct the
1026  * file list in memory without sending it over the wire.  Also, get_dirlist()
1027  * might call this with f set to -2, which also indicates that local filter
1028  * rules should be ignored. */
1029 static void send_directory(int f, struct file_list *flist,
1030                            char *fbuf, int len)
1031 {
1032         struct dirent *di;
1033         unsigned remainder;
1034         char *p;
1035         DIR *d;
1036         int start = flist->count;
1037
1038         if (!(d = opendir(fbuf))) {
1039                 io_error |= IOERR_GENERAL;
1040                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1041                 return;
1042         }
1043
1044         p = fbuf + len;
1045         if (len != 1 || *fbuf != '/')
1046                 *p++ = '/';
1047         *p = '\0';
1048         remainder = MAXPATHLEN - (p - fbuf);
1049
1050         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1051                 char *dname = d_name(di);
1052                 if (dname[0] == '.' && (dname[1] == '\0'
1053                     || (dname[1] == '.' && dname[2] == '\0')))
1054                         continue;
1055                 if (strlcpy(p, dname, remainder) >= remainder) {
1056                         io_error |= IOERR_GENERAL;
1057                         rprintf(FINFO,
1058                                 "cannot send long-named file %s\n",
1059                                 full_fname(fbuf));
1060                         continue;
1061                 }
1062
1063                 send_file_name(f, flist, fbuf, NULL, 0);
1064         }
1065
1066         fbuf[len] = '\0';
1067
1068         if (errno) {
1069                 io_error |= IOERR_GENERAL;
1070                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1071         }
1072
1073         closedir(d);
1074
1075         if (recurse) {
1076                 int i, end = flist->count - 1;
1077                 for (i = start; i <= end; i++)
1078                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1079         }
1080 }
1081
1082 struct file_list *send_file_list(int f, int argc, char *argv[])
1083 {
1084         int len;
1085         STRUCT_STAT st;
1086         char *p, *dir, olddir[sizeof curr_dir];
1087         char lastpath[MAXPATHLEN] = "";
1088         struct file_list *flist;
1089         struct timeval start_tv, end_tv;
1090         int64 start_write;
1091         int use_ff_fd = 0;
1092
1093         rprintf(FLOG, "building file list\n");
1094         if (show_filelist_p())
1095                 start_filelist_progress("building file list");
1096
1097         start_write = stats.total_written;
1098         gettimeofday(&start_tv, NULL);
1099
1100         flist = flist_new(0, "send_file_list");
1101
1102         io_start_buffering_out();
1103         if (filesfrom_fd >= 0) {
1104                 if (argv[0] && !push_dir(argv[0], 0)) {
1105                         rsyserr(FERROR, errno, "push_dir %s failed",
1106                                 full_fname(argv[0]));
1107                         exit_cleanup(RERR_FILESELECT);
1108                 }
1109                 use_ff_fd = 1;
1110         }
1111
1112         while (1) {
1113                 char fbuf[MAXPATHLEN];
1114                 char *fn;
1115                 int is_dot_dir;
1116
1117                 if (use_ff_fd) {
1118                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1119                                 break;
1120                         sanitize_path(fbuf, fbuf, "", 0, NULL);
1121                 } else {
1122                         if (argc-- == 0)
1123                                 break;
1124                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1125                         if (sanitize_paths)
1126                                 sanitize_path(fbuf, fbuf, "", 0, NULL);
1127                 }
1128
1129                 len = strlen(fbuf);
1130                 if (relative_paths) {
1131                         /* We clean up fbuf below. */
1132                         is_dot_dir = 0;
1133                 } else if (!len || fbuf[len - 1] == '/') {
1134                         if (len == 2 && fbuf[0] == '.') {
1135                                 /* Turn "./" into just "." rather than "./." */
1136                                 fbuf[1] = '\0';
1137                         } else {
1138                                 if (len + 1 >= MAXPATHLEN)
1139                                         overflow_exit("send_file_list");
1140                                 fbuf[len++] = '.';
1141                                 fbuf[len] = '\0';
1142                         }
1143                         is_dot_dir = 1;
1144                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1145                     && (len == 2 || fbuf[len-3] == '/')) {
1146                         if (len + 2 >= MAXPATHLEN)
1147                                 overflow_exit("send_file_list");
1148                         fbuf[len++] = '/';
1149                         fbuf[len++] = '.';
1150                         fbuf[len] = '\0';
1151                         is_dot_dir = 1;
1152                 } else {
1153                         is_dot_dir = fbuf[len-1] == '.'
1154                                    && (len == 1 || fbuf[len-2] == '/');
1155                 }
1156
1157                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1158                         io_error |= IOERR_GENERAL;
1159                         rsyserr(FERROR, errno, "link_stat %s failed",
1160                                 full_fname(fbuf));
1161                         continue;
1162                 }
1163
1164                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1165                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1166                         continue;
1167                 }
1168
1169                 dir = NULL;
1170                 olddir[0] = '\0';
1171
1172                 if (!relative_paths) {
1173                         p = strrchr(fbuf, '/');
1174                         if (p) {
1175                                 *p = '\0';
1176                                 if (p == fbuf)
1177                                         dir = "/";
1178                                 else
1179                                         dir = fbuf;
1180                                 len -= p - fbuf + 1;
1181                                 fn = p + 1;
1182                         } else
1183                                 fn = fbuf;
1184                 } else {
1185                         if ((p = strstr(fbuf, "/./")) != NULL) {
1186                                 *p = '\0';
1187                                 if (p == fbuf)
1188                                         dir = "/";
1189                                 else
1190                                         dir = fbuf;
1191                                 len -= p - fbuf + 3;
1192                                 fn = p + 3;
1193                         } else
1194                                 fn = fbuf;
1195                         /* Get rid of trailing "/" and "/.". */
1196                         while (len) {
1197                                 if (fn[len - 1] == '/') {
1198                                         is_dot_dir = 1;
1199                                         if (!--len && !dir) {
1200                                                 len++;
1201                                                 break;
1202                                         }
1203                                 }
1204                                 else if (len >= 2 && fn[len - 1] == '.'
1205                                                   && fn[len - 2] == '/') {
1206                                         is_dot_dir = 1;
1207                                         if (!(len -= 2) && !dir) {
1208                                                 len++;
1209                                                 break;
1210                                         }
1211                                 } else
1212                                         break;
1213                         }
1214                         if (len == 1 && fn[0] == '/')
1215                                 fn[len++] = '.';
1216                         fn[len] = '\0';
1217                         /* Reject a ".." dir in the active part of the path. */
1218                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1219                                 if ((p[2] == '/' || p[2] == '\0')
1220                                  && (p == fn || p[-1] == '/')) {
1221                                         rprintf(FERROR,
1222                                             "found \"..\" dir in relative path: %s\n",
1223                                             fbuf);
1224                                         exit_cleanup(RERR_SYNTAX);
1225                                 }
1226                         }
1227                 }
1228
1229                 if (!*fn) {
1230                         len = 1;
1231                         fn = ".";
1232                 }
1233
1234                 if (dir && *dir) {
1235                         static const char *lastdir;
1236                         static int lastdir_len;
1237
1238                         strlcpy(olddir, curr_dir, sizeof olddir);
1239
1240                         if (!push_dir(dir, 0)) {
1241                                 io_error |= IOERR_GENERAL;
1242                                 rsyserr(FERROR, errno, "push_dir %s failed",
1243                                         full_fname(dir));
1244                                 continue;
1245                         }
1246
1247                         if (lastdir && strcmp(lastdir, dir) == 0) {
1248                                 flist_dir = lastdir;
1249                                 flist_dir_len = lastdir_len;
1250                         } else {
1251                                 flist_dir = lastdir = strdup(dir);
1252                                 flist_dir_len = lastdir_len = strlen(dir);
1253                         }
1254                 }
1255
1256                 if (fn != fbuf)
1257                         memmove(fbuf, fn, len + 1);
1258
1259                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1260                         /* Send the implied directories at the start of the
1261                          * source spec, so we get their permissions right. */
1262                         char *lp = lastpath, *slash = fbuf;
1263                         *p = '\0';
1264                         /* Skip any initial directories in our path that we
1265                          * have in common with lastpath. */
1266                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1267                                 if (*fn == '/')
1268                                         slash = fn;
1269                         }
1270                         *p = '/';
1271                         if (fn != p || (*lp && *lp != '/')) {
1272                                 int save_copy_links = copy_links;
1273                                 int save_xfer_dirs = xfer_dirs;
1274                                 copy_links |= copy_unsafe_links;
1275                                 xfer_dirs = 1;
1276                                 while ((slash = strchr(slash+1, '/')) != 0) {
1277                                         *slash = '\0';
1278                                         send_file_name(f, flist, fbuf, NULL, 0);
1279                                         *slash = '/';
1280                                 }
1281                                 copy_links = save_copy_links;
1282                                 xfer_dirs = save_xfer_dirs;
1283                                 *p = '\0';
1284                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1285                                 *p = '/';
1286                         }
1287                 }
1288
1289                 if (one_file_system)
1290                         filesystem_dev = st.st_dev;
1291
1292                 if (recurse || (xfer_dirs && is_dot_dir)) {
1293                         struct file_struct *file;
1294                         file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
1295                         if (file)
1296                                 send_if_directory(f, flist, file, fbuf, len);
1297                 } else
1298                         send_file_name(f, flist, fbuf, &st, 0);
1299
1300                 if (olddir[0]) {
1301                         flist_dir = NULL;
1302                         flist_dir_len = 0;
1303                         if (!pop_dir(olddir)) {
1304                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1305                                         full_fname(olddir));
1306                                 exit_cleanup(RERR_FILESELECT);
1307                         }
1308                 }
1309         }
1310
1311         gettimeofday(&end_tv, NULL);
1312         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1313                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1314         if (stats.flist_buildtime == 0)
1315                 stats.flist_buildtime = 1;
1316         start_tv = end_tv;
1317
1318         send_file_entry(NULL, f);
1319
1320         if (show_filelist_p())
1321                 finish_filelist_progress(flist);
1322
1323         gettimeofday(&end_tv, NULL);
1324         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1325                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1326
1327         /* Sort the list without removing any duplicates.  This allows the
1328          * receiving side to ask for any name they like, which gives us the
1329          * flexibility to change the way we unduplicate names in the future
1330          * without causing a compatibility problem with older versions. */
1331         clean_flist(flist, 0, 0);
1332
1333         if (!numeric_ids)
1334                 send_uid_list(f);
1335
1336         /* send the io_error flag */
1337         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1338
1339         io_end_buffering();
1340         stats.flist_size = stats.total_written - start_write;
1341         stats.num_files = flist->count;
1342
1343         if (verbose > 3)
1344                 output_flist(flist);
1345
1346         if (verbose > 2)
1347                 rprintf(FINFO, "send_file_list done\n");
1348
1349         return flist;
1350 }
1351
1352 struct file_list *recv_file_list(int f)
1353 {
1354         struct file_list *flist;
1355         unsigned short flags;
1356         int64 start_read;
1357
1358         rprintf(FLOG, "receiving file list\n");
1359         if (show_filelist_p())
1360                 start_filelist_progress("receiving file list");
1361
1362         start_read = stats.total_read;
1363
1364         flist = flist_new(WITH_HLINK, "recv_file_list");
1365
1366
1367         while ((flags = read_byte(f)) != 0) {
1368                 struct file_struct *file;
1369
1370                 flist_expand(flist);
1371
1372                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1373                         flags |= read_byte(f) << 8;
1374                 file = recv_file_entry(flist, flags, f);
1375
1376                 if (S_ISREG(file->mode) || S_ISLNK(file->mode))
1377                         stats.total_size += file->length;
1378
1379                 flist->files[flist->count++] = file;
1380
1381                 maybe_emit_filelist_progress(flist->count);
1382
1383                 if (verbose > 2) {
1384                         rprintf(FINFO, "recv_file_name(%s)\n",
1385                                 f_name(file, NULL));
1386                 }
1387         }
1388         recv_file_entry(NULL, 0, 0); /* Signal that we're done. */
1389
1390         if (verbose > 2)
1391                 rprintf(FINFO, "received %d names\n", flist->count);
1392
1393         if (show_filelist_p())
1394                 finish_filelist_progress(flist);
1395
1396         clean_flist(flist, relative_paths, 1);
1397
1398         if (f >= 0) {
1399                 recv_uid_list(f, flist);
1400
1401                 /* Recv the io_error flag */
1402                 if (lp_ignore_errors(module_id) || ignore_errors)
1403                         read_int(f);
1404                 else
1405                         io_error |= read_int(f);
1406         }
1407
1408         if (verbose > 3)
1409                 output_flist(flist);
1410
1411         if (list_only) {
1412                 int i;
1413                 for (i = 0; i < flist->count; i++)
1414                         list_file_entry(flist->files[i]);
1415         }
1416
1417         if (verbose > 2)
1418                 rprintf(FINFO, "recv_file_list done\n");
1419
1420         stats.flist_size = stats.total_read - start_read;
1421         stats.num_files = flist->count;
1422
1423         return flist;
1424 }
1425
1426 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1427 {
1428         return f_name_cmp(*file1, *file2);
1429 }
1430
1431 /* Search for an identically-named item in the file list.  Note that the
1432  * items must agree in their directory-ness, or no match is returned. */
1433 int flist_find(struct file_list *flist, struct file_struct *f)
1434 {
1435         int low = flist->low, high = flist->high;
1436         int diff, mid, mid_up;
1437
1438         while (low <= high) {
1439                 mid = (low + high) / 2;
1440                 if (flist->files[mid]->basename)
1441                         mid_up = mid;
1442                 else {
1443                         /* Scan for the next non-empty entry using the cached
1444                          * distance values.  If the value isn't fully up-to-
1445                          * date, update it. */
1446                         mid_up = mid + flist->files[mid]->dir.depth;
1447                         if (!flist->files[mid_up]->basename) {
1448                                 do {
1449                                     mid_up += flist->files[mid_up]->dir.depth;
1450                                 } while (!flist->files[mid_up]->basename);
1451                                 flist->files[mid]->dir.depth = mid_up - mid;
1452                         }
1453                         if (mid_up > high) {
1454                                 /* If there's nothing left above us, set high to
1455                                  * a non-empty entry below us and continue. */
1456                                 high = mid - (int)flist->files[mid]->length;
1457                                 if (!flist->files[high]->basename) {
1458                                         do {
1459                                             high -= (int)flist->files[high]->length;
1460                                         } while (!flist->files[high]->basename);
1461                                         flist->files[mid]->length = mid - high;
1462                                 }
1463                                 continue;
1464                         }
1465                 }
1466                 diff = f_name_cmp(flist->files[mid_up], f);
1467                 if (diff == 0) {
1468                         if (protocol_version < 29
1469                             && S_ISDIR(flist->files[mid_up]->mode)
1470                             != S_ISDIR(f->mode))
1471                                 return -1;
1472                         return mid_up;
1473                 }
1474                 if (diff < 0)
1475                         low = mid_up + 1;
1476                 else
1477                         high = mid - 1;
1478         }
1479         return -1;
1480 }
1481
1482 /*
1483  * Free up any resources a file_struct has allocated
1484  * and clear the file.
1485  */
1486 void clear_file(struct file_struct *file)
1487 {
1488         memset(file, 0, file_struct_len);
1489         /* In an empty entry, dir.depth is an offset to the next non-empty
1490          * entry.  Likewise for length in the opposite direction.  We assume
1491          * that we're alone for now since flist_find() will adjust the counts
1492          * it runs into that aren't up-to-date. */
1493         file->length = file->dir.depth = 1;
1494 }
1495
1496 /*
1497  * allocate a new file list
1498  */
1499 struct file_list *flist_new(int with_hlink, char *msg)
1500 {
1501         struct file_list *flist;
1502
1503         flist = new(struct file_list);
1504         if (!flist)
1505                 out_of_memory(msg);
1506
1507         memset(flist, 0, sizeof flist[0]);
1508
1509         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0, out_of_memory, POOL_INTERN)))
1510                 out_of_memory(msg);
1511
1512 #ifdef SUPPORT_HARD_LINKS
1513         if (with_hlink && preserve_hard_links) {
1514                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1515                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1516                         out_of_memory(msg);
1517         }
1518 #endif
1519
1520         return flist;
1521 }
1522
1523 /*
1524  * free up all elements in a flist
1525  */
1526 void flist_free(struct file_list *flist)
1527 {
1528         pool_destroy(flist->file_pool);
1529         pool_destroy(flist->hlink_pool);
1530         free(flist->files);
1531         free(flist);
1532 }
1533
1534 /*
1535  * This routine ensures we don't have any duplicate names in our file list.
1536  * duplicate names can cause corruption because of the pipelining
1537  */
1538 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1539 {
1540         char fbuf[MAXPATHLEN];
1541         int i, prev_i = 0;
1542
1543         if (!flist)
1544                 return;
1545         if (flist->count == 0) {
1546                 flist->high = -1;
1547                 return;
1548         }
1549
1550         qsort(flist->files, flist->count,
1551             sizeof flist->files[0], (int (*)())file_compare);
1552
1553         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1554                 if (flist->files[i]->basename) {
1555                         prev_i = i;
1556                         break;
1557                 }
1558         }
1559         flist->low = prev_i;
1560         while (++i < flist->count) {
1561                 int j;
1562                 struct file_struct *file = flist->files[i];
1563
1564                 if (!file->basename)
1565                         continue;
1566                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1567                         j = prev_i;
1568                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1569                         int save_mode = file->mode;
1570                         /* Make sure that this directory doesn't duplicate a
1571                          * non-directory earlier in the list. */
1572                         flist->high = prev_i;
1573                         file->mode = S_IFREG;
1574                         j = flist_find(flist, file);
1575                         file->mode = save_mode;
1576                 } else
1577                         j = -1;
1578                 if (j >= 0) {
1579                         struct file_struct *fp = flist->files[j];
1580                         int keep, drop;
1581                         /* If one is a dir and the other is not, we want to
1582                          * keep the dir because it might have contents in the
1583                          * list. */
1584                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1585                                 if (S_ISDIR(file->mode))
1586                                         keep = i, drop = j;
1587                                 else
1588                                         keep = j, drop = i;
1589                         } else
1590                                 keep = j, drop = i;
1591                         if (verbose > 1 && !am_server) {
1592                                 rprintf(FINFO,
1593                                         "removing duplicate name %s from file list (%d)\n",
1594                                         f_name(file, fbuf), drop);
1595                         }
1596                         /* Make sure we don't lose track of a user-specified
1597                          * top directory. */
1598                         flist->files[keep]->flags |= flist->files[drop]->flags
1599                                                    & (FLAG_TOP_DIR|FLAG_XFER_DIR);
1600
1601                         clear_file(flist->files[drop]);
1602
1603                         if (keep == i) {
1604                                 if (flist->low == drop) {
1605                                         for (j = drop + 1;
1606                                              j < i && !flist->files[j]->basename;
1607                                              j++) {}
1608                                         flist->low = j;
1609                                 }
1610                                 prev_i = i;
1611                         }
1612                 } else
1613                         prev_i = i;
1614         }
1615         flist->high = no_dups ? prev_i : flist->count - 1;
1616
1617         if (strip_root) {
1618                 /* We need to strip off the leading slashes for relative
1619                  * paths, but this must be done _after_ the sorting phase. */
1620                 for (i = flist->low; i <= flist->high; i++) {
1621                         struct file_struct *file = flist->files[i];
1622
1623                         if (!file->dirname)
1624                                 continue;
1625                         while (*file->dirname == '/')
1626                                 file->dirname++;
1627                         if (!*file->dirname)
1628                                 file->dirname = NULL;
1629                 }
1630         }
1631
1632         if (prune_empty_dirs && no_dups) {
1633                 int j, prev_depth = 0;
1634
1635                 prev_i = 0; /* It's OK that this isn't really true. */
1636
1637                 for (i = flist->low; i <= flist->high; i++) {
1638                         struct file_struct *fp, *file = flist->files[i];
1639
1640                         /* This temporarily abuses the dir.depth value for a
1641                          * directory that is in a chain that might get pruned.
1642                          * We restore the old value if it gets a reprieve. */
1643                         if (S_ISDIR(file->mode) && file->dir.depth) {
1644                                 /* Dump empty dirs when coming back down. */
1645                                 for (j = prev_depth; j >= file->dir.depth; j--) {
1646                                         fp = flist->files[prev_i];
1647                                         if (fp->dir.depth >= 0)
1648                                                 break;
1649                                         prev_i = -fp->dir.depth-1;
1650                                         clear_file(fp);
1651                                 }
1652                                 prev_depth = file->dir.depth;
1653                                 if (is_excluded(f_name(file, fbuf), 1,
1654                                                        ALL_FILTERS)) {
1655                                         /* Keep dirs through this dir. */
1656                                         for (j = prev_depth-1; ; j--) {
1657                                                 fp = flist->files[prev_i];
1658                                                 if (fp->dir.depth >= 0)
1659                                                         break;
1660                                                 prev_i = -fp->dir.depth-1;
1661                                                 fp->dir.depth = j;
1662                                         }
1663                                 } else
1664                                         file->dir.depth = -prev_i-1;
1665                                 prev_i = i;
1666                         } else {
1667                                 /* Keep dirs through this non-dir. */
1668                                 for (j = prev_depth; ; j--) {
1669                                         fp = flist->files[prev_i];
1670                                         if (fp->dir.depth >= 0)
1671                                                 break;
1672                                         prev_i = -fp->dir.depth-1;
1673                                         fp->dir.depth = j;
1674                                 }
1675                         }
1676                 }
1677                 /* Dump empty all remaining empty dirs. */
1678                 while (1) {
1679                         struct file_struct *fp = flist->files[prev_i];
1680                         if (fp->dir.depth >= 0)
1681                                 break;
1682                         prev_i = -fp->dir.depth-1;
1683                         clear_file(fp);
1684                 }
1685
1686                 for (i = flist->low; i <= flist->high; i++) {
1687                         if (flist->files[i]->basename)
1688                                 break;
1689                 }
1690                 flist->low = i;
1691                 for (i = flist->high; i >= flist->low; i--) {
1692                         if (flist->files[i]->basename)
1693                                 break;
1694                 }
1695                 flist->high = i;
1696         }
1697 }
1698
1699 static void output_flist(struct file_list *flist)
1700 {
1701         char uidbuf[16], gidbuf[16], depthbuf[16];
1702         struct file_struct *file;
1703         const char *who = who_am_i();
1704         int i;
1705
1706         for (i = 0; i < flist->count; i++) {
1707                 file = flist->files[i];
1708                 if ((am_root || am_sender) && preserve_uid) {
1709                         snprintf(uidbuf, sizeof uidbuf, " uid=%ld",
1710                                  (long)F_UID(file));
1711                 } else
1712                         *uidbuf = '\0';
1713                 if (preserve_gid && F_GID(file) != GID_NONE) {
1714                         snprintf(gidbuf, sizeof gidbuf, " gid=%ld",
1715                                  (long)F_GID(file));
1716                 } else
1717                         *gidbuf = '\0';
1718                 if (!am_sender)
1719                         snprintf(depthbuf, sizeof depthbuf, "%d", file->dir.depth);
1720                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1721                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1722                         file->dirname ? file->dirname : "",
1723                         file->dirname ? "/" : "", NS(file->basename),
1724                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1725                         (double)file->length, uidbuf, gidbuf, file->flags);
1726         }
1727 }
1728
1729 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1730 enum fnc_type { t_PATH, t_ITEM };
1731
1732 /* Compare the names of two file_struct entities, similar to how strcmp()
1733  * would do if it were operating on the joined strings.
1734  *
1735  * Some differences beginning with protocol_version 29: (1) directory names
1736  * are compared with an assumed trailing slash so that they compare in a
1737  * way that would cause them to sort immediately prior to any content they
1738  * may have; (2) a directory of any name compares after a non-directory of
1739  * any name at the same depth; (3) a directory with name "." compares prior
1740  * to anything else.  These changes mean that a directory and a non-dir
1741  * with the same name will not compare as equal (protocol_version >= 29).
1742  *
1743  * The dirname component can be an empty string, but the basename component
1744  * cannot (and never is in the current codebase).  The basename component
1745  * may be NULL (for a removed item), in which case it is considered to be
1746  * after any existing item. */
1747 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1748 {
1749         int dif;
1750         const uchar *c1, *c2;
1751         enum fnc_state state1, state2;
1752         enum fnc_type type1, type2;
1753         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1754
1755         if (!f1 || !f1->basename) {
1756                 if (!f2 || !f2->basename)
1757                         return 0;
1758                 return -1;
1759         }
1760         if (!f2 || !f2->basename)
1761                 return 1;
1762
1763         c1 = (uchar*)f1->dirname;
1764         c2 = (uchar*)f2->dirname;
1765         if (c1 == c2)
1766                 c1 = c2 = NULL;
1767         if (!c1) {
1768                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1769                 c1 = (uchar*)f1->basename;
1770                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1771                         type1 = t_ITEM;
1772                         state1 = s_TRAILING;
1773                         c1 = (uchar*)"";
1774                 } else
1775                         state1 = s_BASE;
1776         } else {
1777                 type1 = t_path;
1778                 state1 = s_DIR;
1779         }
1780         if (!c2) {
1781                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1782                 c2 = (uchar*)f2->basename;
1783                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1784                         type2 = t_ITEM;
1785                         state2 = s_TRAILING;
1786                         c2 = (uchar*)"";
1787                 } else
1788                         state2 = s_BASE;
1789         } else {
1790                 type2 = t_path;
1791                 state2 = s_DIR;
1792         }
1793
1794         if (type1 != type2)
1795                 return type1 == t_PATH ? 1 : -1;
1796
1797         do {
1798                 if (!*c1) {
1799                         switch (state1) {
1800                         case s_DIR:
1801                                 state1 = s_SLASH;
1802                                 c1 = (uchar*)"/";
1803                                 break;
1804                         case s_SLASH:
1805                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1806                                 c1 = (uchar*)f1->basename;
1807                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1808                                         type1 = t_ITEM;
1809                                         state1 = s_TRAILING;
1810                                         c1 = (uchar*)"";
1811                                 } else
1812                                         state1 = s_BASE;
1813                                 break;
1814                         case s_BASE:
1815                                 state1 = s_TRAILING;
1816                                 if (type1 == t_PATH) {
1817                                         c1 = (uchar*)"/";
1818                                         break;
1819                                 }
1820                                 /* FALL THROUGH */
1821                         case s_TRAILING:
1822                                 type1 = t_ITEM;
1823                                 break;
1824                         }
1825                         if (*c2 && type1 != type2)
1826                                 return type1 == t_PATH ? 1 : -1;
1827                 }
1828                 if (!*c2) {
1829                         switch (state2) {
1830                         case s_DIR:
1831                                 state2 = s_SLASH;
1832                                 c2 = (uchar*)"/";
1833                                 break;
1834                         case s_SLASH:
1835                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1836                                 c2 = (uchar*)f2->basename;
1837                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1838                                         type2 = t_ITEM;
1839                                         state2 = s_TRAILING;
1840                                         c2 = (uchar*)"";
1841                                 } else
1842                                         state2 = s_BASE;
1843                                 break;
1844                         case s_BASE:
1845                                 state2 = s_TRAILING;
1846                                 if (type2 == t_PATH) {
1847                                         c2 = (uchar*)"/";
1848                                         break;
1849                                 }
1850                                 /* FALL THROUGH */
1851                         case s_TRAILING:
1852                                 if (!*c1)
1853                                         return 0;
1854                                 type2 = t_ITEM;
1855                                 break;
1856                         }
1857                         if (type1 != type2)
1858                                 return type1 == t_PATH ? 1 : -1;
1859                 }
1860         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
1861
1862         return dif;
1863 }
1864
1865 /* Return a copy of the full filename of a flist entry, using the indicated
1866  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
1867  * done because we checked the size when creating the file_struct entry.
1868  */
1869 char *f_name(struct file_struct *f, char *fbuf)
1870 {
1871         if (!f || !f->basename)
1872                 return NULL;
1873
1874         if (!fbuf) {
1875                 static char names[5][MAXPATHLEN];
1876                 static unsigned int n;
1877
1878                 n = (n + 1) % (sizeof names / sizeof names[0]);
1879
1880                 fbuf = names[n];
1881         }
1882
1883         if (f->dirname) {
1884                 int len = strlen(f->dirname);
1885                 memcpy(fbuf, f->dirname, len);
1886                 fbuf[len] = '/';
1887                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
1888         } else
1889                 strlcpy(fbuf, f->basename, MAXPATHLEN);
1890
1891         return fbuf;
1892 }
1893
1894 /* Do a non-recursive scan of the named directory, possibly ignoring all
1895  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1896  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1897  * buffer (the functions we call will append names onto the end, but the old
1898  * dir value will be restored on exit). */
1899 struct file_list *get_dirlist(char *dirname, int dlen,
1900                               int ignore_filter_rules)
1901 {
1902         struct file_list *dirlist;
1903         char dirbuf[MAXPATHLEN];
1904         int save_recurse = recurse;
1905         int save_xfer_dirs = xfer_dirs;
1906
1907         if (dlen < 0) {
1908                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1909                 if (dlen >= MAXPATHLEN)
1910                         return NULL;
1911                 dirname = dirbuf;
1912         }
1913
1914         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1915
1916         recurse = 0;
1917         xfer_dirs = 1;
1918         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1919         xfer_dirs = save_xfer_dirs;
1920         recurse = save_recurse;
1921         if (do_progress)
1922                 flist_count_offset += dirlist->count;
1923
1924         clean_flist(dirlist, 0, 0);
1925
1926         if (verbose > 3)
1927                 output_flist(dirlist);
1928
1929         return dirlist;
1930 }