849851e02febcade4c8242925af683a199a20bb6
[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) 2002-2008 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 3 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, visit the http://fsf.org website.
21  */
22
23 #include "rsync.h"
24 #include "ifuncs.h"
25 #include "rounding.h"
26 #include "io.h"
27
28 extern int am_root;
29 extern int am_server;
30 extern int am_daemon;
31 extern int am_sender;
32 extern int am_generator;
33 extern int inc_recurse;
34 extern int always_checksum;
35 extern int module_id;
36 extern int ignore_errors;
37 extern int numeric_ids;
38 extern int recurse;
39 extern int use_qsort;
40 extern int xfer_dirs;
41 extern int filesfrom_fd;
42 extern int one_file_system;
43 extern int copy_dirlinks;
44 extern int keep_dirlinks;
45 extern int preserve_uid;
46 extern int preserve_gid;
47 extern int preserve_acls;
48 extern int preserve_xattrs;
49 extern int preserve_links;
50 extern int preserve_hard_links;
51 extern int preserve_devices;
52 extern int preserve_specials;
53 extern int uid_ndx;
54 extern int gid_ndx;
55 extern int eol_nulls;
56 extern int relative_paths;
57 extern int implied_dirs;
58 extern int file_extra_cnt;
59 extern int ignore_perishable;
60 extern int non_perishable_cnt;
61 extern int prune_empty_dirs;
62 extern int copy_links;
63 extern int copy_unsafe_links;
64 extern int protocol_version;
65 extern int sanitize_paths;
66 extern int munge_symlinks;
67 extern int need_unsorted_flist;
68 extern int output_needs_newline;
69 extern int sender_keeps_checksum;
70 extern int unsort_ndx;
71 extern struct stats stats;
72 extern char *filesfrom_host;
73
74 extern char curr_dir[MAXPATHLEN];
75
76 extern struct chmod_mode_struct *chmod_modes;
77
78 extern struct filter_list_struct filter_list;
79 extern struct filter_list_struct daemon_filter_list;
80
81 #ifdef ICONV_OPTION
82 extern int filesfrom_convert;
83 extern iconv_t ic_send, ic_recv;
84 #endif
85
86 #define PTR_SIZE (sizeof (struct file_struct *))
87
88 int io_error;
89 int checksum_len;
90 dev_t filesystem_dev; /* used to implement -x */
91
92 struct file_list *cur_flist, *first_flist, *dir_flist;
93 int send_dir_ndx = -1, send_dir_depth = -1;
94 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
95 int file_total = 0; /* total of all active items over all file-lists */
96 int flist_eof = 0; /* all the file-lists are now known */
97
98 #define NORMAL_NAME 0
99 #define SLASH_ENDING_NAME 1
100 #define DOTDIR_NAME 2
101
102 /* Starting from protocol version 26, we always use 64-bit ino_t and dev_t
103  * internally, even if this platform does not allow files to have 64-bit inums.
104  * The only exception is if we're on a platform with no 64-bit type at all.
105  *
106  * Because we use read_longint() to get these off the wire, if you transfer
107  * devices or (for protocols < 30) hardlinks with dev or inum > 2**32 to a
108  * machine with no 64-bit types then you will get an overflow error.
109  *
110  * Note that if you transfer devices from a 64-bit-devt machine (say, Solaris)
111  * to a 32-bit-devt machine (say, Linux-2.2/x86) then the device numbers will
112  * be truncated.  But it's a kind of silly thing to do anyhow. */
113
114 /* The tmp_* vars are used as a cache area by make_file() to store data
115  * that the sender doesn't need to remember in its file list.  The data
116  * will survive just long enough to be used by send_file_entry(). */
117 static dev_t tmp_rdev;
118 #ifdef SUPPORT_HARD_LINKS
119 static int64 tmp_dev, tmp_ino;
120 #endif
121 static char tmp_sum[MAX_DIGEST_LEN];
122
123 static char empty_sum[MAX_DIGEST_LEN];
124 static int flist_count_offset; /* for --delete --progress */
125 static int dir_count = 0;
126
127 static void flist_sort_and_clean(struct file_list *flist, int strip_root);
128 static void output_flist(struct file_list *flist);
129
130 void init_flist(void)
131 {
132         if (DEBUG_GTE(FLIST, 4)) {
133                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
134                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
135         }
136         checksum_len = protocol_version < 21 ? 2
137                      : protocol_version < 30 ? MD4_DIGEST_LEN
138                      : MD5_DIGEST_LEN;
139 }
140
141 static int show_filelist_p(void)
142 {
143         return INFO_GTE(FLIST, 1) && xfer_dirs && !am_server && !inc_recurse;
144 }
145
146 static void start_filelist_progress(char *kind)
147 {
148         rprintf(FCLIENT, "%s ... ", kind);
149         output_needs_newline = 1;
150         rflush(FINFO);
151 }
152
153 static void emit_filelist_progress(int count)
154 {
155         rprintf(FCLIENT, " %d files...\r", count);
156 }
157
158 static void maybe_emit_filelist_progress(int count)
159 {
160         if (INFO_GTE(FLIST, 2) && show_filelist_p() && (count % 100) == 0)
161                 emit_filelist_progress(count);
162 }
163
164 static void finish_filelist_progress(const struct file_list *flist)
165 {
166         if (INFO_GTE(FLIST, 2)) {
167                 /* This overwrites the progress line */
168                 rprintf(FINFO, "%d file%sto consider\n",
169                         flist->used, flist->used == 1 ? " " : "s ");
170         } else {
171                 output_needs_newline = 0;
172                 rprintf(FINFO, "done\n");
173         }
174 }
175
176 void show_flist_stats(void)
177 {
178         /* Nothing yet */
179 }
180
181 /* Stat either a symlink or its referent, depending on the settings of
182  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
183  *
184  * If path is the name of a symlink, then the linkbuf buffer (which must hold
185  * MAXPATHLEN chars) will be set to the symlink's target string.
186  *
187  * The stat structure pointed to by stp will contain information about the
188  * link or the referent as appropriate, if they exist. */
189 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
190 {
191 #ifdef SUPPORT_LINKS
192         if (link_stat(path, stp, copy_dirlinks) < 0)
193                 return -1;
194         if (S_ISLNK(stp->st_mode)) {
195                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
196                 if (llen < 0)
197                         return -1;
198                 linkbuf[llen] = '\0';
199                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
200                         if (INFO_GTE(SYMSAFE, 1)) {
201                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
202                                         path, linkbuf);
203                         }
204                         return x_stat(path, stp, NULL);
205                 }
206                 if (munge_symlinks && am_sender && llen > SYMLINK_PREFIX_LEN
207                  && strncmp(linkbuf, SYMLINK_PREFIX, SYMLINK_PREFIX_LEN) == 0) {
208                         memmove(linkbuf, linkbuf + SYMLINK_PREFIX_LEN,
209                                 llen - SYMLINK_PREFIX_LEN + 1);
210                 }
211         }
212         return 0;
213 #else
214         return x_stat(path, stp, NULL);
215 #endif
216 }
217
218 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
219 {
220 #ifdef SUPPORT_LINKS
221         if (copy_links)
222                 return x_stat(path, stp, NULL);
223         if (x_lstat(path, stp, NULL) < 0)
224                 return -1;
225         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
226                 STRUCT_STAT st;
227                 if (x_stat(path, &st, NULL) == 0 && S_ISDIR(st.st_mode))
228                         *stp = st;
229         }
230         return 0;
231 #else
232         return x_stat(path, stp, NULL);
233 #endif
234 }
235
236 static inline int is_daemon_excluded(const char *fname, int is_dir)
237 {
238         if (daemon_filter_list.head
239          && check_filter(&daemon_filter_list, FLOG, fname, is_dir) < 0) {
240                 errno = ENOENT;
241                 return 1;
242         }
243         return 0;
244 }
245
246 static inline int path_is_daemon_excluded(char *path, int ignore_filename)
247 {
248         if (daemon_filter_list.head) {
249                 char *slash = path;
250
251                 while ((slash = strchr(slash+1, '/')) != NULL) {
252                         int ret;
253                         *slash = '\0';
254                         ret = check_filter(&daemon_filter_list, FLOG, path, 1);
255                         *slash = '/';
256                         if (ret < 0) {
257                                 errno = ENOENT;
258                                 return 1;
259                         }
260                 }
261
262                 if (!ignore_filename
263                  && check_filter(&daemon_filter_list, FLOG, path, 1) < 0) {
264                         errno = ENOENT;
265                         return 1;
266                 }
267         }
268
269         return 0;
270 }
271
272 /* This function is used to check if a file should be included/excluded
273  * from the list of files based on its name and type etc.  The value of
274  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
275 static int is_excluded(const char *fname, int is_dir, int filter_level)
276 {
277 #if 0 /* This currently never happens, so avoid a useless compare. */
278         if (filter_level == NO_FILTERS)
279                 return 0;
280 #endif
281         if (is_daemon_excluded(fname, is_dir))
282                 return 1;
283         if (filter_level != ALL_FILTERS)
284                 return 0;
285         if (filter_list.head
286             && check_filter(&filter_list, FINFO, fname, is_dir) < 0)
287                 return 1;
288         return 0;
289 }
290
291 static void send_directory(int f, struct file_list *flist,
292                            char *fbuf, int len, int flags);
293
294 static const char *pathname, *orig_dir;
295 static int pathname_len;
296
297 /* Make sure flist can hold at least flist->used + extra entries. */
298 static void flist_expand(struct file_list *flist, int extra)
299 {
300         struct file_struct **new_ptr;
301
302         if (flist->used + extra <= flist->malloced)
303                 return;
304
305         if (flist->malloced < FLIST_START)
306                 flist->malloced = FLIST_START;
307         else if (flist->malloced >= FLIST_LINEAR)
308                 flist->malloced += FLIST_LINEAR;
309         else
310                 flist->malloced *= 2;
311
312         /* In case count jumped or we are starting the list
313          * with a known size just set it. */
314         if (flist->malloced < flist->used + extra)
315                 flist->malloced = flist->used + extra;
316
317         new_ptr = realloc_array(flist->files, struct file_struct *,
318                                 flist->malloced);
319
320         if (DEBUG_GTE(FLIST, 1) && flist->malloced != FLIST_START) {
321                 rprintf(FCLIENT, "[%s] expand file_list pointer array to %s bytes, did%s move\n",
322                     who_am_i(),
323                     big_num(sizeof flist->files[0] * flist->malloced, 0),
324                     (new_ptr == flist->files) ? " not" : "");
325         }
326
327         flist->files = new_ptr;
328
329         if (!flist->files)
330                 out_of_memory("flist_expand");
331 }
332
333 static void flist_done_allocating(struct file_list *flist)
334 {
335         void *ptr = pool_boundary(flist->file_pool, 8*1024);
336         if (flist->pool_boundary == ptr)
337                 flist->pool_boundary = NULL; /* list didn't use any pool memory */
338         else
339                 flist->pool_boundary = ptr;
340 }
341
342 /* Call this with EITHER (1) "file, NULL, 0" to chdir() to the file's
343  * F_PATHNAME(), or (2) "NULL, dir, dirlen" to chdir() to the supplied dir,
344  * with dir == NULL taken to be the starting directory, and dirlen < 0
345  * indicating that strdup(dir) should be called and then the -dirlen length
346  * value checked to ensure that it is not daemon-excluded. */
347 int change_pathname(struct file_struct *file, const char *dir, int dirlen)
348 {
349         if (dirlen < 0) {
350                 char *cpy = strdup(dir);
351                 if (*cpy != '/')
352                         change_dir(orig_dir, CD_SKIP_CHDIR);
353                 if (path_is_daemon_excluded(cpy, 0))
354                         goto chdir_error;
355                 dir = cpy;
356                 dirlen = -dirlen;
357         } else {
358                 if (file) {
359                         if (pathname == F_PATHNAME(file))
360                                 return 1;
361                         dir = F_PATHNAME(file);
362                         if (dir)
363                                 dirlen = strlen(dir);
364                 } else if (pathname == dir)
365                         return 1;
366                 if (dir && *dir != '/')
367                         change_dir(orig_dir, CD_SKIP_CHDIR);
368         }
369
370         pathname = dir;
371         pathname_len = dirlen;
372
373         if (!dir)
374                 dir = orig_dir;
375
376         if (!change_dir(dir, CD_NORMAL)) {
377           chdir_error:
378                 io_error |= IOERR_GENERAL;
379                 rsyserr(FERROR, errno, "change_dir %s failed", full_fname(dir));
380                 if (dir != orig_dir)
381                         change_dir(orig_dir, CD_NORMAL);
382                 pathname = NULL;
383                 pathname_len = 0;
384                 return 0;
385         }
386
387         return 1;
388 }
389
390 static void send_file_entry(int f, const char *fname, struct file_struct *file, int ndx, int first_ndx)
391 {
392         static time_t modtime;
393         static mode_t mode;
394 #ifdef SUPPORT_HARD_LINKS
395         static int64 dev;
396 #endif
397         static dev_t rdev;
398         static uint32 rdev_major;
399         static uid_t uid;
400         static gid_t gid;
401         static const char *user_name, *group_name;
402         static char lastname[MAXPATHLEN];
403 #ifdef SUPPORT_HARD_LINKS
404         int first_hlink_ndx = -1;
405 #endif
406         int l1, l2;
407         int xflags;
408
409         /* Initialize starting value of xflags. */
410         if (protocol_version >= 30 && S_ISDIR(file->mode)) {
411                 dir_count++;
412                 if (file->flags & FLAG_CONTENT_DIR)
413                         xflags = file->flags & FLAG_TOP_DIR;
414                 else if (file->flags & FLAG_IMPLIED_DIR)
415                         xflags = XMIT_TOP_DIR | XMIT_NO_CONTENT_DIR;
416                 else
417                         xflags = XMIT_NO_CONTENT_DIR;
418         } else
419                 xflags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
420
421         if (file->mode == mode)
422                 xflags |= XMIT_SAME_MODE;
423         else
424                 mode = file->mode;
425
426         if ((preserve_devices && IS_DEVICE(mode))
427          || (preserve_specials && IS_SPECIAL(mode))) {
428                 if (protocol_version < 28) {
429                         if (tmp_rdev == rdev)
430                                 xflags |= XMIT_SAME_RDEV_pre28;
431                         else
432                                 rdev = tmp_rdev;
433                 } else {
434                         rdev = tmp_rdev;
435                         if ((uint32)major(rdev) == rdev_major)
436                                 xflags |= XMIT_SAME_RDEV_MAJOR;
437                         else
438                                 rdev_major = major(rdev);
439                         if (protocol_version < 30 && (uint32)minor(rdev) <= 0xFFu)
440                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
441                 }
442         } else if (protocol_version < 28)
443                 rdev = MAKEDEV(0, 0);
444         if (!preserve_uid || ((uid_t)F_OWNER(file) == uid && *lastname))
445                 xflags |= XMIT_SAME_UID;
446         else {
447                 uid = F_OWNER(file);
448                 if (!numeric_ids) {
449                         user_name = add_uid(uid);
450                         if (inc_recurse && user_name)
451                                 xflags |= XMIT_USER_NAME_FOLLOWS;
452                 }
453         }
454         if (!preserve_gid || ((gid_t)F_GROUP(file) == gid && *lastname))
455                 xflags |= XMIT_SAME_GID;
456         else {
457                 gid = F_GROUP(file);
458                 if (!numeric_ids) {
459                         group_name = add_gid(gid);
460                         if (inc_recurse && group_name)
461                                 xflags |= XMIT_GROUP_NAME_FOLLOWS;
462                 }
463         }
464         if (file->modtime == modtime)
465                 xflags |= XMIT_SAME_TIME;
466         else
467                 modtime = file->modtime;
468
469 #ifdef SUPPORT_HARD_LINKS
470         if (tmp_dev != 0) {
471                 if (protocol_version >= 30) {
472                         struct ht_int64_node *np = idev_find(tmp_dev, tmp_ino);
473                         first_hlink_ndx = (int32)(long)np->data - 1;
474                         if (first_hlink_ndx < 0) {
475                                 np->data = (void*)(long)(first_ndx + ndx + 1);
476                                 xflags |= XMIT_HLINK_FIRST;
477                         }
478                         if (DEBUG_GTE(HLINK, 1)) {
479                                 if (first_hlink_ndx >= 0) {
480                                         rprintf(FINFO, "[%s] #%d hard-links #%d (%sabbrev)\n",
481                                                 who_am_i(), first_ndx + ndx, first_hlink_ndx,
482                                                 first_hlink_ndx >= first_ndx ? "" : "un");
483                                 } else if (DEBUG_GTE(HLINK, 3)) {
484                                         rprintf(FINFO, "[%s] dev:inode for #%d is %s:%s\n",
485                                                 who_am_i(), first_ndx + ndx,
486                                                 big_num(tmp_dev, 0), big_num(tmp_ino, 0));
487                                 }
488                         }
489                 } else {
490                         if (tmp_dev == dev) {
491                                 if (protocol_version >= 28)
492                                         xflags |= XMIT_SAME_DEV_pre30;
493                         } else
494                                 dev = tmp_dev;
495                 }
496                 xflags |= XMIT_HLINKED;
497         }
498 #endif
499
500         for (l1 = 0;
501             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
502             l1++) {}
503         l2 = strlen(fname+l1);
504
505         if (l1 > 0)
506                 xflags |= XMIT_SAME_NAME;
507         if (l2 > 255)
508                 xflags |= XMIT_LONG_NAME;
509
510         /* We must make sure we don't send a zero flag byte or the
511          * other end will terminate the flist transfer.  Note that
512          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
513          * it's harmless way to add a bit to the first flag byte. */
514         if (protocol_version >= 28) {
515                 if (!xflags && !S_ISDIR(mode))
516                         xflags |= XMIT_TOP_DIR;
517                 if ((xflags & 0xFF00) || !xflags) {
518                         xflags |= XMIT_EXTENDED_FLAGS;
519                         write_shortint(f, xflags);
520                 } else
521                         write_byte(f, xflags);
522         } else {
523                 if (!(xflags & 0xFF))
524                         xflags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
525                 write_byte(f, xflags);
526         }
527         if (xflags & XMIT_SAME_NAME)
528                 write_byte(f, l1);
529         if (xflags & XMIT_LONG_NAME)
530                 write_varint30(f, l2);
531         else
532                 write_byte(f, l2);
533         write_buf(f, fname + l1, l2);
534
535 #ifdef SUPPORT_HARD_LINKS
536         if (first_hlink_ndx >= 0) {
537                 write_varint(f, first_hlink_ndx);
538                 if (first_hlink_ndx >= first_ndx)
539                         goto the_end;
540         }
541 #endif
542
543         write_varlong30(f, F_LENGTH(file), 3);
544         if (!(xflags & XMIT_SAME_TIME)) {
545                 if (protocol_version >= 30)
546                         write_varlong(f, modtime, 4);
547                 else
548                         write_int(f, modtime);
549         }
550         if (!(xflags & XMIT_SAME_MODE))
551                 write_int(f, to_wire_mode(mode));
552         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
553                 if (protocol_version < 30)
554                         write_int(f, uid);
555                 else {
556                         write_varint(f, uid);
557                         if (xflags & XMIT_USER_NAME_FOLLOWS) {
558                                 int len = strlen(user_name);
559                                 write_byte(f, len);
560                                 write_buf(f, user_name, len);
561                         }
562                 }
563         }
564         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
565                 if (protocol_version < 30)
566                         write_int(f, gid);
567                 else {
568                         write_varint(f, gid);
569                         if (xflags & XMIT_GROUP_NAME_FOLLOWS) {
570                                 int len = strlen(group_name);
571                                 write_byte(f, len);
572                                 write_buf(f, group_name, len);
573                         }
574                 }
575         }
576         if ((preserve_devices && IS_DEVICE(mode))
577          || (preserve_specials && IS_SPECIAL(mode))) {
578                 if (protocol_version < 28) {
579                         if (!(xflags & XMIT_SAME_RDEV_pre28))
580                                 write_int(f, (int)rdev);
581                 } else {
582                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
583                                 write_varint30(f, major(rdev));
584                         if (protocol_version >= 30)
585                                 write_varint(f, minor(rdev));
586                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
587                                 write_byte(f, minor(rdev));
588                         else
589                                 write_int(f, minor(rdev));
590                 }
591         }
592
593 #ifdef SUPPORT_LINKS
594         if (preserve_links && S_ISLNK(mode)) {
595                 const char *sl = F_SYMLINK(file);
596                 int len = strlen(sl);
597                 write_varint30(f, len);
598                 write_buf(f, sl, len);
599         }
600 #endif
601
602 #ifdef SUPPORT_HARD_LINKS
603         if (tmp_dev != 0 && protocol_version < 30) {
604                 if (protocol_version < 26) {
605                         /* 32-bit dev_t and ino_t */
606                         write_int(f, (int32)dev);
607                         write_int(f, (int32)tmp_ino);
608                 } else {
609                         /* 64-bit dev_t and ino_t */
610                         if (!(xflags & XMIT_SAME_DEV_pre30))
611                                 write_longint(f, dev);
612                         write_longint(f, tmp_ino);
613                 }
614         }
615 #endif
616
617         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
618                 const char *sum;
619                 if (S_ISREG(mode))
620                         sum = tmp_sum;
621                 else {
622                         /* Prior to 28, we sent a useless set of nulls. */
623                         sum = empty_sum;
624                 }
625                 write_buf(f, sum, checksum_len);
626         }
627
628 #ifdef SUPPORT_HARD_LINKS
629   the_end:
630 #endif
631         strlcpy(lastname, fname, MAXPATHLEN);
632
633         if (S_ISREG(mode) || S_ISLNK(mode))
634                 stats.total_size += F_LENGTH(file);
635 }
636
637 static struct file_struct *recv_file_entry(struct file_list *flist,
638                                            int xflags, int f)
639 {
640         static int64 modtime;
641         static mode_t mode;
642 #ifdef SUPPORT_HARD_LINKS
643         static int64 dev;
644 #endif
645         static dev_t rdev;
646         static uint32 rdev_major;
647         static uid_t uid;
648         static gid_t gid;
649         static uint16 gid_flags;
650         static char lastname[MAXPATHLEN], *lastdir;
651         static int lastdir_depth, lastdir_len = -1;
652         static unsigned int del_hier_name_len = 0;
653         static int in_del_hier = 0;
654         char thisname[MAXPATHLEN];
655         unsigned int l1 = 0, l2 = 0;
656         int alloc_len, basename_len, linkname_len;
657         int extra_len = file_extra_cnt * EXTRA_LEN;
658         int first_hlink_ndx = -1;
659         int64 file_length;
660         const char *basename;
661         struct file_struct *file;
662         alloc_pool_t *pool;
663         char *bp;
664
665         if (xflags & XMIT_SAME_NAME)
666                 l1 = read_byte(f);
667
668         if (xflags & XMIT_LONG_NAME)
669                 l2 = read_varint30(f);
670         else
671                 l2 = read_byte(f);
672
673         if (l2 >= MAXPATHLEN - l1) {
674                 rprintf(FERROR,
675                         "overflow: xflags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
676                         xflags, l1, l2, lastname, who_am_i());
677                 overflow_exit("recv_file_entry");
678         }
679
680         strlcpy(thisname, lastname, l1 + 1);
681         read_sbuf(f, &thisname[l1], l2);
682         thisname[l1 + l2] = 0;
683
684         /* Abuse basename_len for a moment... */
685         basename_len = strlcpy(lastname, thisname, MAXPATHLEN);
686
687 #ifdef ICONV_OPTION
688         if (ic_recv != (iconv_t)-1) {
689                 xbuf outbuf, inbuf;
690
691                 INIT_CONST_XBUF(outbuf, thisname);
692                 INIT_XBUF(inbuf, lastname, basename_len, (size_t)-1);
693
694                 if (iconvbufs(ic_recv, &inbuf, &outbuf, 0) < 0) {
695                         io_error |= IOERR_GENERAL;
696                         rprintf(FINFO,
697                             "[%s] cannot convert filename: %s (%s)\n",
698                             who_am_i(), lastname, strerror(errno));
699                         outbuf.len = 0;
700                 }
701                 outbuf.buf[outbuf.len] = '\0';
702         }
703 #endif
704
705         if (*thisname)
706                 clean_fname(thisname, 0);
707
708         if (sanitize_paths)
709                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
710
711         if ((basename = strrchr(thisname, '/')) != NULL) {
712                 int len = basename++ - thisname;
713                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
714                         lastdir = new_array(char, len + 1);
715                         memcpy(lastdir, thisname, len);
716                         lastdir[len] = '\0';
717                         lastdir_len = len;
718                         lastdir_depth = count_dir_elements(lastdir);
719                 }
720         } else
721                 basename = thisname;
722         basename_len = strlen(basename) + 1; /* count the '\0' */
723
724 #ifdef SUPPORT_HARD_LINKS
725         if (protocol_version >= 30
726          && BITS_SETnUNSET(xflags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
727                 first_hlink_ndx = read_varint(f);
728                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->ndx_start + flist->used) {
729                         rprintf(FERROR,
730                                 "hard-link reference out of range: %d (%d)\n",
731                                 first_hlink_ndx, flist->ndx_start + flist->used);
732                         exit_cleanup(RERR_PROTOCOL);
733                 }
734                 if (DEBUG_GTE(HLINK, 1)) {
735                         rprintf(FINFO, "[%s] #%d hard-links #%d (%sabbrev)\n",
736                                 who_am_i(), flist->used+flist->ndx_start, first_hlink_ndx,
737                                 first_hlink_ndx >= flist->ndx_start ? "" : "un");
738                 }
739                 if (first_hlink_ndx >= flist->ndx_start) {
740                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
741                         file_length = F_LENGTH(first);
742                         modtime = first->modtime;
743                         mode = first->mode;
744                         if (preserve_uid)
745                                 uid = F_OWNER(first);
746                         if (preserve_gid)
747                                 gid = F_GROUP(first);
748                         if ((preserve_devices && IS_DEVICE(mode))
749                          || (preserve_specials && IS_SPECIAL(mode))) {
750                                 uint32 *devp = F_RDEV_P(first);
751                                 rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
752                                 extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
753                         }
754                         if (preserve_links && S_ISLNK(mode))
755                                 linkname_len = strlen(F_SYMLINK(first)) + 1;
756                         else
757                                 linkname_len = 0;
758                         goto create_object;
759                 }
760         }
761 #endif
762
763         file_length = read_varlong30(f, 3);
764         if (!(xflags & XMIT_SAME_TIME)) {
765                 if (protocol_version >= 30) {
766                         modtime = read_varlong(f, 4);
767 #if SIZEOF_TIME_T < SIZEOF_INT64
768                         if (!am_generator && (int64)(time_t)modtime != modtime) {
769                                 rprintf(FERROR_XFER,
770                                     "Time value of %s truncated on receiver.\n",
771                                     lastname);
772                         }
773 #endif
774                 } else
775                         modtime = read_int(f);
776         }
777         if (!(xflags & XMIT_SAME_MODE))
778                 mode = from_wire_mode(read_int(f));
779
780         if (chmod_modes && !S_ISLNK(mode))
781                 mode = tweak_mode(mode, chmod_modes);
782
783         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
784                 if (protocol_version < 30)
785                         uid = (uid_t)read_int(f);
786                 else {
787                         uid = (uid_t)read_varint(f);
788                         if (xflags & XMIT_USER_NAME_FOLLOWS)
789                                 uid = recv_user_name(f, uid);
790                         else if (inc_recurse && am_root && !numeric_ids)
791                                 uid = match_uid(uid);
792                 }
793         }
794         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
795                 if (protocol_version < 30)
796                         gid = (gid_t)read_int(f);
797                 else {
798                         gid = (gid_t)read_varint(f);
799                         gid_flags = 0;
800                         if (xflags & XMIT_GROUP_NAME_FOLLOWS)
801                                 gid = recv_group_name(f, gid, &gid_flags);
802                         else if (inc_recurse && (!am_root || !numeric_ids))
803                                 gid = match_gid(gid, &gid_flags);
804                 }
805         }
806
807         if ((preserve_devices && IS_DEVICE(mode))
808          || (preserve_specials && IS_SPECIAL(mode))) {
809                 if (protocol_version < 28) {
810                         if (!(xflags & XMIT_SAME_RDEV_pre28))
811                                 rdev = (dev_t)read_int(f);
812                 } else {
813                         uint32 rdev_minor;
814                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
815                                 rdev_major = read_varint30(f);
816                         if (protocol_version >= 30)
817                                 rdev_minor = read_varint(f);
818                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
819                                 rdev_minor = read_byte(f);
820                         else
821                                 rdev_minor = read_int(f);
822                         rdev = MAKEDEV(rdev_major, rdev_minor);
823                 }
824                 extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
825                 file_length = 0;
826         } else if (protocol_version < 28)
827                 rdev = MAKEDEV(0, 0);
828
829 #ifdef SUPPORT_LINKS
830         if (preserve_links && S_ISLNK(mode)) {
831                 linkname_len = read_varint30(f) + 1; /* count the '\0' */
832                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
833                         rprintf(FERROR, "overflow: linkname_len=%d\n",
834                                 linkname_len - 1);
835                         overflow_exit("recv_file_entry");
836                 }
837                 if (munge_symlinks)
838                         linkname_len += SYMLINK_PREFIX_LEN;
839         }
840         else
841 #endif
842                 linkname_len = 0;
843
844 #ifdef SUPPORT_HARD_LINKS
845   create_object:
846         if (preserve_hard_links) {
847                 if (protocol_version < 28 && S_ISREG(mode))
848                         xflags |= XMIT_HLINKED;
849                 if (xflags & XMIT_HLINKED)
850                         extra_len += (inc_recurse+1) * EXTRA_LEN;
851         }
852 #endif
853
854 #ifdef SUPPORT_ACLS
855         /* Directories need an extra int32 for the default ACL. */
856         if (preserve_acls && S_ISDIR(mode))
857                 extra_len += EXTRA_LEN;
858 #endif
859
860         if (always_checksum && S_ISREG(mode))
861                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
862
863 #if SIZEOF_INT64 >= 8
864         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
865                 extra_len += EXTRA_LEN;
866 #endif
867         if (file_length < 0) {
868                 rprintf(FERROR, "Offset underflow: file-length is negative\n");
869                 exit_cleanup(RERR_UNSUPPORTED);
870         }
871
872         if (inc_recurse && S_ISDIR(mode)) {
873                 if (one_file_system) {
874                         /* Room to save the dir's device for -x */
875                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
876                 }
877                 pool = dir_flist->file_pool;
878         } else
879                 pool = flist->file_pool;
880
881 #if EXTRA_ROUNDING > 0
882         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
883                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
884 #endif
885
886         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
887                   + linkname_len;
888         bp = pool_alloc(pool, alloc_len, "recv_file_entry");
889
890         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
891         bp += extra_len;
892         file = (struct file_struct *)bp;
893         bp += FILE_STRUCT_LEN;
894
895         memcpy(bp, basename, basename_len);
896
897 #ifdef SUPPORT_HARD_LINKS
898         if (xflags & XMIT_HLINKED)
899                 file->flags |= FLAG_HLINKED;
900 #endif
901         file->modtime = (time_t)modtime;
902         file->len32 = (uint32)file_length;
903 #if SIZEOF_INT64 >= 8
904         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
905 #if SIZEOF_CAPITAL_OFF_T < 8
906                 rprintf(FERROR, "Offset overflow: attempted 64-bit file-length\n");
907                 exit_cleanup(RERR_UNSUPPORTED);
908 #else
909                 file->flags |= FLAG_LENGTH64;
910                 OPT_EXTRA(file, 0)->unum = (uint32)(file_length >> 32);
911 #endif
912         }
913 #endif
914         file->mode = mode;
915         if (preserve_uid)
916                 F_OWNER(file) = uid;
917         if (preserve_gid) {
918                 F_GROUP(file) = gid;
919                 file->flags |= gid_flags;
920         }
921         if (unsort_ndx)
922                 F_NDX(file) = flist->used + flist->ndx_start;
923
924         if (basename != thisname) {
925                 file->dirname = lastdir;
926                 F_DEPTH(file) = lastdir_depth + 1;
927         } else
928                 F_DEPTH(file) = 1;
929
930         if (S_ISDIR(mode)) {
931                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
932                         F_DEPTH(file)--;
933                 if (protocol_version >= 30) {
934                         if (!(xflags & XMIT_NO_CONTENT_DIR)) {
935                                 if (xflags & XMIT_TOP_DIR)
936                                         file->flags |= FLAG_TOP_DIR;
937                                 file->flags |= FLAG_CONTENT_DIR;
938                         } else if (xflags & XMIT_TOP_DIR)
939                                 file->flags |= FLAG_IMPLIED_DIR;
940                 } else if (xflags & XMIT_TOP_DIR) {
941                         in_del_hier = recurse;
942                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
943                         if (relative_paths && del_hier_name_len > 2
944                             && lastname[del_hier_name_len-1] == '.'
945                             && lastname[del_hier_name_len-2] == '/')
946                                 del_hier_name_len -= 2;
947                         file->flags |= FLAG_TOP_DIR | FLAG_CONTENT_DIR;
948                 } else if (in_del_hier) {
949                         if (!relative_paths || !del_hier_name_len
950                          || (l1 >= del_hier_name_len
951                           && lastname[del_hier_name_len] == '/'))
952                                 file->flags |= FLAG_CONTENT_DIR;
953                         else
954                                 in_del_hier = 0;
955                 }
956         }
957
958         if ((preserve_devices && IS_DEVICE(mode))
959          || (preserve_specials && IS_SPECIAL(mode))) {
960                 uint32 *devp = F_RDEV_P(file);
961                 DEV_MAJOR(devp) = major(rdev);
962                 DEV_MINOR(devp) = minor(rdev);
963         }
964
965 #ifdef SUPPORT_LINKS
966         if (linkname_len) {
967                 bp += basename_len;
968                 if (first_hlink_ndx >= flist->ndx_start) {
969                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
970                         memcpy(bp, F_SYMLINK(first), linkname_len);
971                 } else if (munge_symlinks) {
972                         strlcpy(bp, SYMLINK_PREFIX, linkname_len);
973                         bp += SYMLINK_PREFIX_LEN;
974                         linkname_len -= SYMLINK_PREFIX_LEN;
975                         read_sbuf(f, bp, linkname_len - 1);
976                 } else {
977                         read_sbuf(f, bp, linkname_len - 1);
978                         if (sanitize_paths)
979                                 sanitize_path(bp, bp, "", lastdir_depth, SP_DEFAULT);
980                 }
981         }
982 #endif
983
984 #ifdef SUPPORT_HARD_LINKS
985         if (preserve_hard_links && xflags & XMIT_HLINKED) {
986                 if (protocol_version >= 30) {
987                         if (xflags & XMIT_HLINK_FIRST) {
988                                 F_HL_GNUM(file) = flist->ndx_start + flist->used;
989                         } else
990                                 F_HL_GNUM(file) = first_hlink_ndx;
991                 } else {
992                         static int32 cnt = 0;
993                         struct ht_int64_node *np;
994                         int64 ino;
995                         int32 ndx;
996                         if (protocol_version < 26) {
997                                 dev = read_int(f);
998                                 ino = read_int(f);
999                         } else {
1000                                 if (!(xflags & XMIT_SAME_DEV_pre30))
1001                                         dev = read_longint(f);
1002                                 ino = read_longint(f);
1003                         }
1004                         np = idev_find(dev, ino);
1005                         ndx = (int32)(long)np->data - 1;
1006                         if (ndx < 0) {
1007                                 ndx = cnt++;
1008                                 np->data = (void*)(long)cnt;
1009                         }
1010                         F_HL_GNUM(file) = ndx;
1011                 }
1012         }
1013 #endif
1014
1015         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
1016                 if (S_ISREG(mode))
1017                         bp = F_SUM(file);
1018                 else {
1019                         /* Prior to 28, we get a useless set of nulls. */
1020                         bp = tmp_sum;
1021                 }
1022                 if (first_hlink_ndx >= flist->ndx_start) {
1023                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
1024                         memcpy(bp, F_SUM(first), checksum_len);
1025                 } else
1026                         read_buf(f, bp, checksum_len);
1027         }
1028
1029 #ifdef SUPPORT_ACLS
1030         if (preserve_acls && !S_ISLNK(mode))
1031                 receive_acl(file, f);
1032 #endif
1033 #ifdef SUPPORT_XATTRS
1034         if (preserve_xattrs)
1035                 receive_xattr(file, f );
1036 #endif
1037
1038         if (S_ISREG(mode) || S_ISLNK(mode))
1039                 stats.total_size += file_length;
1040
1041         return file;
1042 }
1043
1044 /* Create a file_struct for a named file by reading its stat() information
1045  * and performing extensive checks against global options.
1046  *
1047  * Returns a pointer to the new file struct, or NULL if there was an error
1048  * or this file should be excluded.
1049  *
1050  * Note: Any error (here or in send_file_name) that results in the omission of
1051  * an existent source file from the file list should set
1052  * "io_error |= IOERR_GENERAL" to avoid deletion of the file from the
1053  * destination if --delete is on. */
1054 struct file_struct *make_file(const char *fname, struct file_list *flist,
1055                               STRUCT_STAT *stp, int flags, int filter_level)
1056 {
1057         static char *lastdir;
1058         static int lastdir_len = -1;
1059         struct file_struct *file;
1060         char thisname[MAXPATHLEN];
1061         char linkname[MAXPATHLEN];
1062         int alloc_len, basename_len, linkname_len;
1063         int extra_len = file_extra_cnt * EXTRA_LEN;
1064         const char *basename;
1065         alloc_pool_t *pool;
1066         STRUCT_STAT st;
1067         char *bp;
1068
1069         if (strlcpy(thisname, fname, sizeof thisname) >= sizeof thisname) {
1070                 io_error |= IOERR_GENERAL;
1071                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
1072                 return NULL;
1073         }
1074         clean_fname(thisname, 0);
1075         if (sanitize_paths)
1076                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
1077
1078         if (stp && S_ISDIR(stp->st_mode)) {
1079                 st = *stp; /* Needed for "symlink/." with --relative. */
1080                 *linkname = '\0'; /* make IBM code checker happy */
1081         } else if (readlink_stat(thisname, &st, linkname) != 0) {
1082                 int save_errno = errno;
1083                 /* See if file is excluded before reporting an error. */
1084                 if (filter_level != NO_FILTERS
1085                  && (is_excluded(thisname, 0, filter_level)
1086                   || is_excluded(thisname, 1, filter_level))) {
1087                         if (ignore_perishable && save_errno != ENOENT)
1088                                 non_perishable_cnt++;
1089                         return NULL;
1090                 }
1091                 if (save_errno == ENOENT) {
1092 #ifdef SUPPORT_LINKS
1093                         /* When our options tell us to follow a symlink that
1094                          * points nowhere, tell the user about the symlink
1095                          * instead of giving a "vanished" message.  We only
1096                          * dereference a symlink if one of the --copy*links
1097                          * options was specified, so there's no need for the
1098                          * extra lstat() if one of these options isn't on. */
1099                         if ((copy_links || copy_unsafe_links || copy_dirlinks)
1100                          && x_lstat(thisname, &st, NULL) == 0
1101                          && S_ISLNK(st.st_mode)) {
1102                                 io_error |= IOERR_GENERAL;
1103                                 rprintf(FERROR_XFER, "symlink has no referent: %s\n",
1104                                         full_fname(thisname));
1105                         } else
1106 #endif
1107                         {
1108                                 enum logcode c = am_daemon && protocol_version < 28
1109                                                ? FERROR : FWARNING;
1110                                 io_error |= IOERR_VANISHED;
1111                                 rprintf(c, "file has vanished: %s\n",
1112                                         full_fname(thisname));
1113                         }
1114                 } else {
1115                         io_error |= IOERR_GENERAL;
1116                         rsyserr(FERROR_XFER, save_errno, "readlink %s failed",
1117                                 full_fname(thisname));
1118                 }
1119                 return NULL;
1120         }
1121
1122         if (filter_level == NO_FILTERS)
1123                 goto skip_filters;
1124
1125         if (S_ISDIR(st.st_mode)) {
1126                 if (!xfer_dirs) {
1127                         rprintf(FINFO, "skipping directory %s\n", thisname);
1128                         return NULL;
1129                 }
1130                 /* -x only affects dirs because we need to avoid recursing
1131                  * into a mount-point directory, not to avoid copying a
1132                  * symlinked file if -L (or similar) was specified. */
1133                 if (one_file_system && st.st_dev != filesystem_dev
1134                  && BITS_SETnUNSET(flags, FLAG_CONTENT_DIR, FLAG_TOP_DIR)) {
1135                         if (one_file_system > 1) {
1136                                 if (INFO_GTE(MOUNT, 1)) {
1137                                         rprintf(FINFO,
1138                                             "[%s] skipping mount-point dir %s\n",
1139                                             who_am_i(), thisname);
1140                                 }
1141                                 return NULL;
1142                         }
1143                         flags |= FLAG_MOUNT_DIR;
1144                         flags &= ~FLAG_CONTENT_DIR;
1145                 }
1146         } else
1147                 flags &= ~FLAG_CONTENT_DIR;
1148
1149         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
1150                 if (ignore_perishable)
1151                         non_perishable_cnt++;
1152                 return NULL;
1153         }
1154
1155         if (lp_ignore_nonreadable(module_id)) {
1156 #ifdef SUPPORT_LINKS
1157                 if (!S_ISLNK(st.st_mode))
1158 #endif
1159                         if (access(thisname, R_OK) != 0)
1160                                 return NULL;
1161         }
1162
1163   skip_filters:
1164
1165         /* Only divert a directory in the main transfer. */
1166         if (flist) {
1167                 if (flist->prev && S_ISDIR(st.st_mode)
1168                  && flags & FLAG_DIVERT_DIRS) {
1169                         /* Room for parent/sibling/next-child info. */
1170                         extra_len += DIRNODE_EXTRA_CNT * EXTRA_LEN;
1171                         if (relative_paths)
1172                                 extra_len += PTR_EXTRA_CNT * EXTRA_LEN;
1173                         pool = dir_flist->file_pool;
1174                 } else
1175                         pool = flist->file_pool;
1176         } else {
1177 #ifdef SUPPORT_ACLS
1178                 /* Directories need an extra int32 for the default ACL. */
1179                 if (preserve_acls && S_ISDIR(st.st_mode))
1180                         extra_len += EXTRA_LEN;
1181 #endif
1182                 pool = NULL;
1183         }
1184
1185         if (DEBUG_GTE(FLIST, 2)) {
1186                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1187                         who_am_i(), thisname, filter_level);
1188         }
1189
1190         if ((basename = strrchr(thisname, '/')) != NULL) {
1191                 int len = basename++ - thisname;
1192                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1193                         lastdir = new_array(char, len + 1);
1194                         memcpy(lastdir, thisname, len);
1195                         lastdir[len] = '\0';
1196                         lastdir_len = len;
1197                 }
1198         } else
1199                 basename = thisname;
1200         basename_len = strlen(basename) + 1; /* count the '\0' */
1201
1202 #ifdef SUPPORT_LINKS
1203         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1204 #else
1205         linkname_len = 0;
1206 #endif
1207
1208 #if SIZEOF_CAPITAL_OFF_T >= 8
1209         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1210                 extra_len += EXTRA_LEN;
1211 #endif
1212
1213         if (always_checksum && am_sender && S_ISREG(st.st_mode)) {
1214                 file_checksum(thisname, tmp_sum, st.st_size);
1215                 if (sender_keeps_checksum)
1216                         extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
1217         }
1218
1219 #if EXTRA_ROUNDING > 0
1220         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1221                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1222 #endif
1223
1224         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1225                   + linkname_len;
1226         if (pool)
1227                 bp = pool_alloc(pool, alloc_len, "make_file");
1228         else {
1229                 if (!(bp = new_array(char, alloc_len)))
1230                         out_of_memory("make_file");
1231         }
1232
1233         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1234         bp += extra_len;
1235         file = (struct file_struct *)bp;
1236         bp += FILE_STRUCT_LEN;
1237
1238         memcpy(bp, basename, basename_len);
1239
1240 #ifdef SUPPORT_HARD_LINKS
1241         if (preserve_hard_links && flist && flist->prev) {
1242                 if (protocol_version >= 28
1243                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1244                  : S_ISREG(st.st_mode)) {
1245                         tmp_dev = (int64)st.st_dev + 1;
1246                         tmp_ino = (int64)st.st_ino;
1247                 } else
1248                         tmp_dev = 0;
1249         }
1250 #endif
1251
1252 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1253         if (IS_DEVICE(st.st_mode) || IS_SPECIAL(st.st_mode)) {
1254                 tmp_rdev = st.st_rdev;
1255                 st.st_size = 0;
1256         }
1257 #endif
1258
1259         file->flags = flags;
1260         file->modtime = st.st_mtime;
1261         file->len32 = (uint32)st.st_size;
1262 #if SIZEOF_CAPITAL_OFF_T >= 8
1263         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1264                 file->flags |= FLAG_LENGTH64;
1265                 OPT_EXTRA(file, 0)->unum = (uint32)(st.st_size >> 32);
1266         }
1267 #endif
1268         file->mode = st.st_mode;
1269         if (uid_ndx) /* Check uid_ndx instead of preserve_uid for del support */
1270                 F_OWNER(file) = st.st_uid;
1271         if (gid_ndx) /* Check gid_ndx instead of preserve_gid for del support */
1272                 F_GROUP(file) = st.st_gid;
1273
1274         if (basename != thisname)
1275                 file->dirname = lastdir;
1276
1277 #ifdef SUPPORT_LINKS
1278         if (linkname_len)
1279                 memcpy(bp + basename_len, linkname, linkname_len);
1280 #endif
1281
1282         if (am_sender)
1283                 F_PATHNAME(file) = pathname;
1284         else if (!pool)
1285                 F_DEPTH(file) = extra_len / EXTRA_LEN;
1286
1287         /* This code is only used by the receiver when it is building
1288          * a list of files for a delete pass. */
1289         if (keep_dirlinks && linkname_len && flist) {
1290                 STRUCT_STAT st2;
1291                 int save_mode = file->mode;
1292                 file->mode = S_IFDIR; /* Find a directory with our name. */
1293                 if (flist_find(dir_flist, file) >= 0
1294                  && x_stat(thisname, &st2, NULL) == 0 && S_ISDIR(st2.st_mode)) {
1295                         file->modtime = st2.st_mtime;
1296                         file->len32 = 0;
1297                         file->mode = st2.st_mode;
1298                         if (uid_ndx)
1299                                 F_OWNER(file) = st2.st_uid;
1300                         if (gid_ndx)
1301                                 F_GROUP(file) = st2.st_gid;
1302                 } else
1303                         file->mode = save_mode;
1304         }
1305
1306         if (basename_len == 0+1) {
1307                 if (!pool)
1308                         unmake_file(file);
1309                 return NULL;
1310         }
1311
1312         if (sender_keeps_checksum && S_ISREG(st.st_mode))
1313                 memcpy(F_SUM(file), tmp_sum, checksum_len);
1314
1315         if (unsort_ndx)
1316                 F_NDX(file) = dir_count;
1317
1318         return file;
1319 }
1320
1321 /* Only called for temporary file_struct entries created by make_file(). */
1322 void unmake_file(struct file_struct *file)
1323 {
1324         free(REQ_EXTRA(file, F_DEPTH(file)));
1325 }
1326
1327 static struct file_struct *send_file_name(int f, struct file_list *flist,
1328                                           const char *fname, STRUCT_STAT *stp,
1329                                           int flags, int filter_level)
1330 {
1331         struct file_struct *file;
1332
1333         file = make_file(fname, flist, stp, flags, filter_level);
1334         if (!file)
1335                 return NULL;
1336
1337         if (chmod_modes && !S_ISLNK(file->mode))
1338                 file->mode = tweak_mode(file->mode, chmod_modes);
1339
1340         if (f >= 0) {
1341                 char fbuf[MAXPATHLEN];
1342 #if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
1343                 stat_x sx;
1344 #endif
1345
1346 #ifdef ICONV_OPTION
1347                 if (ic_send != (iconv_t)-1) {
1348                         xbuf outbuf, inbuf;
1349
1350                         INIT_CONST_XBUF(outbuf, fbuf);
1351
1352                         if (file->dirname) {
1353                                 INIT_XBUF_STRLEN(inbuf, (char*)file->dirname);
1354                                 outbuf.size -= 2; /* Reserve room for '/' & 1 more char. */
1355                                 if (iconvbufs(ic_send, &inbuf, &outbuf, 0) < 0)
1356                                         goto convert_error;
1357                                 outbuf.size += 2;
1358                                 outbuf.buf[outbuf.len++] = '/';
1359                         }
1360
1361                         INIT_XBUF_STRLEN(inbuf, (char*)file->basename);
1362                         if (iconvbufs(ic_send, &inbuf, &outbuf, 0) < 0) {
1363                           convert_error:
1364                                 io_error |= IOERR_GENERAL;
1365                                 rprintf(FINFO,
1366                                     "[%s] cannot convert filename: %s (%s)\n",
1367                                     who_am_i(), f_name(file, fbuf), strerror(errno));
1368                                 return NULL;
1369                         }
1370                         outbuf.buf[outbuf.len] = '\0';
1371                 } else
1372 #endif
1373                         f_name(file, fbuf);
1374
1375 #ifdef SUPPORT_ACLS
1376                 if (preserve_acls && !S_ISLNK(file->mode)) {
1377                         sx.st.st_mode = file->mode;
1378                         sx.acc_acl = sx.def_acl = NULL;
1379                         if (get_acl(fname, &sx) < 0) {
1380                                 io_error |= IOERR_GENERAL;
1381                                 return NULL;
1382                         }
1383                 }
1384 #endif
1385 #ifdef SUPPORT_XATTRS
1386                 if (preserve_xattrs) {
1387                         sx.xattr = NULL;
1388                         if (get_xattr(fname, &sx) < 0) {
1389                                 io_error |= IOERR_GENERAL;
1390                                 return NULL;
1391                         }
1392                 }
1393 #endif
1394
1395                 send_file_entry(f, fbuf, file, flist->used, flist->ndx_start);
1396
1397 #ifdef SUPPORT_ACLS
1398                 if (preserve_acls && !S_ISLNK(file->mode)) {
1399                         send_acl(&sx, f);
1400                         free_acl(&sx);
1401                 }
1402 #endif
1403 #ifdef SUPPORT_XATTRS
1404                 if (preserve_xattrs) {
1405                         F_XATTR(file) = send_xattr(&sx, f);
1406                         free_xattr(&sx);
1407                 }
1408 #endif
1409         }
1410
1411         maybe_emit_filelist_progress(flist->used + flist_count_offset);
1412
1413         flist_expand(flist, 1);
1414         flist->files[flist->used++] = file;
1415
1416         return file;
1417 }
1418
1419 static void send_if_directory(int f, struct file_list *flist,
1420                               struct file_struct *file,
1421                               char *fbuf, unsigned int ol,
1422                               int flags)
1423 {
1424         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1425
1426         if (S_ISDIR(file->mode)
1427             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1428                 void *save_filters;
1429                 unsigned int len = strlen(fbuf);
1430                 if (len > 1 && fbuf[len-1] == '/')
1431                         fbuf[--len] = '\0';
1432                 if (len >= MAXPATHLEN - 1) {
1433                         io_error |= IOERR_GENERAL;
1434                         rprintf(FERROR_XFER, "skipping long-named directory: %s\n",
1435                                 full_fname(fbuf));
1436                         return;
1437                 }
1438                 save_filters = push_local_filters(fbuf, len);
1439                 send_directory(f, flist, fbuf, len, flags);
1440                 pop_local_filters(save_filters);
1441                 fbuf[ol] = '\0';
1442                 if (is_dot_dir)
1443                         fbuf[ol-1] = '.';
1444         }
1445 }
1446
1447 static int file_compare(const void *file1, const void *file2)
1448 {
1449         return f_name_cmp(*(struct file_struct **)file1,
1450                           *(struct file_struct **)file2);
1451 }
1452
1453 /* The guts of a merge-sort algorithm.  This was derived from the glibc
1454  * version, but I (Wayne) changed the merge code to do less copying and
1455  * to require only half the amount of temporary memory. */
1456 static void fsort_tmp(struct file_struct **fp, size_t num,
1457                       struct file_struct **tmp)
1458 {
1459         struct file_struct **f1, **f2, **t;
1460         size_t n1, n2;
1461
1462         n1 = num / 2;
1463         n2 = num - n1;
1464         f1 = fp;
1465         f2 = fp + n1;
1466
1467         if (n1 > 1)
1468                 fsort_tmp(f1, n1, tmp);
1469         if (n2 > 1)
1470                 fsort_tmp(f2, n2, tmp);
1471
1472         while (f_name_cmp(*f1, *f2) <= 0) {
1473                 if (!--n1)
1474                         return;
1475                 f1++;
1476         }
1477
1478         t = tmp;
1479         memcpy(t, f1, n1 * PTR_SIZE);
1480
1481         *f1++ = *f2++, n2--;
1482
1483         while (n1 > 0 && n2 > 0) {
1484                 if (f_name_cmp(*t, *f2) <= 0)
1485                         *f1++ = *t++, n1--;
1486                 else
1487                         *f1++ = *f2++, n2--;
1488         }
1489
1490         if (n1 > 0)
1491                 memcpy(f1, t, n1 * PTR_SIZE);
1492 }
1493
1494 /* This file-struct sorting routine makes sure that any identical names in
1495  * the file list stay in the same order as they were in the original list.
1496  * This is particularly vital in inc_recurse mode where we expect a sort
1497  * on the flist to match the exact order of a sort on the dir_flist. */
1498 static void fsort(struct file_struct **fp, size_t num)
1499 {
1500         if (num <= 1)
1501                 return;
1502
1503         if (use_qsort)
1504                 qsort(fp, num, PTR_SIZE, file_compare);
1505         else {
1506                 struct file_struct **tmp = new_array(struct file_struct *,
1507                                                      (num+1) / 2);
1508                 fsort_tmp(fp, num, tmp);
1509                 free(tmp);
1510         }
1511 }
1512
1513 /* We take an entire set of sibling dirs from the sorted flist and link them
1514  * into the tree, setting the appropriate parent/child/sibling pointers. */
1515 static void add_dirs_to_tree(int parent_ndx, struct file_list *from_flist,
1516                              int dir_cnt)
1517 {
1518         int i;
1519         int32 *dp = NULL;
1520         int32 *parent_dp = parent_ndx < 0 ? NULL
1521                          : F_DIR_NODE_P(dir_flist->sorted[parent_ndx]);
1522
1523         flist_expand(dir_flist, dir_cnt);
1524         dir_flist->sorted = dir_flist->files;
1525
1526         for (i = 0; dir_cnt; i++) {
1527                 struct file_struct *file = from_flist->sorted[i];
1528
1529                 if (!S_ISDIR(file->mode))
1530                         continue;
1531
1532                 dir_flist->files[dir_flist->used++] = file;
1533                 dir_cnt--;
1534
1535                 if (file->basename[0] == '.' && file->basename[1] == '\0')
1536                         continue;
1537
1538                 if (dp)
1539                         DIR_NEXT_SIBLING(dp) = dir_flist->used - 1;
1540                 else if (parent_dp)
1541                         DIR_FIRST_CHILD(parent_dp) = dir_flist->used - 1;
1542                 else
1543                         send_dir_ndx = dir_flist->used - 1;
1544
1545                 dp = F_DIR_NODE_P(file);
1546                 DIR_PARENT(dp) = parent_ndx;
1547                 DIR_FIRST_CHILD(dp) = -1;
1548         }
1549         if (dp)
1550                 DIR_NEXT_SIBLING(dp) = -1;
1551 }
1552
1553 /* This function is normally called by the sender, but the receiving side also
1554  * calls it from get_dirlist() with f set to -1 so that we just construct the
1555  * file list in memory without sending it over the wire.  Also, get_dirlist()
1556  * might call this with f set to -2, which also indicates that local filter
1557  * rules should be ignored. */
1558 static void send_directory(int f, struct file_list *flist, char *fbuf, int len,
1559                            int flags)
1560 {
1561         struct dirent *di;
1562         unsigned remainder;
1563         char *p;
1564         DIR *d;
1565         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1566         int start = flist->used;
1567         int filter_level = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1568
1569         assert(flist != NULL);
1570
1571         if (!(d = opendir(fbuf))) {
1572                 io_error |= IOERR_GENERAL;
1573                 rsyserr(FERROR_XFER, errno, "opendir %s failed", full_fname(fbuf));
1574                 return;
1575         }
1576
1577         p = fbuf + len;
1578         if (len != 1 || *fbuf != '/')
1579                 *p++ = '/';
1580         *p = '\0';
1581         remainder = MAXPATHLEN - (p - fbuf);
1582
1583         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1584                 char *dname = d_name(di);
1585                 if (dname[0] == '.' && (dname[1] == '\0'
1586                     || (dname[1] == '.' && dname[2] == '\0')))
1587                         continue;
1588                 if (strlcpy(p, dname, remainder) >= remainder) {
1589                         io_error |= IOERR_GENERAL;
1590                         rprintf(FINFO,
1591                                 "cannot send long-named file %s\n",
1592                                 full_fname(fbuf));
1593                         continue;
1594                 }
1595                 if (dname[0] == '\0') {
1596                         io_error |= IOERR_GENERAL;
1597                         rprintf(FINFO,
1598                                 "cannot send file with empty name in %s\n",
1599                                 full_fname(fbuf));
1600                         continue;
1601                 }
1602
1603                 send_file_name(f, flist, fbuf, NULL, flags, filter_level);
1604         }
1605
1606         fbuf[len] = '\0';
1607
1608         if (errno) {
1609                 io_error |= IOERR_GENERAL;
1610                 rsyserr(FERROR_XFER, errno, "readdir(%s)", full_fname(fbuf));
1611         }
1612
1613         closedir(d);
1614
1615         if (f >= 0 && recurse && !divert_dirs) {
1616                 int i, end = flist->used - 1;
1617                 /* send_if_directory() bumps flist->used, so use "end". */
1618                 for (i = start; i <= end; i++)
1619                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1620         }
1621 }
1622
1623 static void send_implied_dirs(int f, struct file_list *flist, char *fname,
1624                               char *start, char *limit, int flags, char name_type)
1625 {
1626         static char lastpath[MAXPATHLEN] = "";
1627         static int lastpath_len = 0;
1628         static struct file_struct *lastpath_struct = NULL;
1629         struct file_struct *file;
1630         item_list *relname_list;
1631         relnamecache **rnpp;
1632         int len, need_new_dir, depth = 0;
1633         struct filter_list_struct save_filter_list = filter_list;
1634
1635         flags = (flags | FLAG_IMPLIED_DIR) & ~(FLAG_TOP_DIR | FLAG_CONTENT_DIR);
1636         filter_list.head = filter_list.tail = NULL; /* Don't filter implied dirs. */
1637
1638         if (inc_recurse) {
1639                 if (lastpath_struct && F_PATHNAME(lastpath_struct) == pathname
1640                  && lastpath_len == limit - fname
1641                  && strncmp(lastpath, fname, lastpath_len) == 0)
1642                         need_new_dir = 0;
1643                 else
1644                         need_new_dir = 1;
1645         } else {
1646                 char *tp = fname, *lp = lastpath;
1647                 /* Skip any initial directories in our path that we
1648                  * have in common with lastpath. */
1649                 assert(start == fname);
1650                 for ( ; ; tp++, lp++) {
1651                         if (tp == limit) {
1652                                 if (*lp == '/' || *lp == '\0')
1653                                         goto done;
1654                                 break;
1655                         }
1656                         if (*lp != *tp)
1657                                 break;
1658                         if (*tp == '/') {
1659                                 start = tp;
1660                                 depth++;
1661                         }
1662                 }
1663                 need_new_dir = 1;
1664         }
1665
1666         if (need_new_dir) {
1667                 int save_copy_links = copy_links;
1668                 int save_xfer_dirs = xfer_dirs;
1669                 char *slash;
1670
1671                 copy_links = xfer_dirs = 1;
1672
1673                 *limit = '\0';
1674
1675                 for (slash = start; (slash = strchr(slash+1, '/')) != NULL; ) {
1676                         *slash = '\0';
1677                         file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1678                         depth++;
1679                         if (!inc_recurse && file && S_ISDIR(file->mode))
1680                                 change_local_filter_dir(fname, strlen(fname), depth);
1681                         *slash = '/';
1682                 }
1683
1684                 file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1685                 if (inc_recurse) {
1686                         if (file && !S_ISDIR(file->mode))
1687                                 file = NULL;
1688                         lastpath_struct = file;
1689                 } else if (file && S_ISDIR(file->mode))
1690                         change_local_filter_dir(fname, strlen(fname), ++depth);
1691
1692                 strlcpy(lastpath, fname, sizeof lastpath);
1693                 lastpath_len = limit - fname;
1694
1695                 *limit = '/';
1696
1697                 copy_links = save_copy_links;
1698                 xfer_dirs = save_xfer_dirs;
1699
1700                 if (!inc_recurse)
1701                         goto done;
1702         }
1703
1704         if (!lastpath_struct)
1705                 goto done; /* dir must have vanished */
1706
1707         len = strlen(limit+1);
1708         memcpy(&relname_list, F_DIR_RELNAMES_P(lastpath_struct), sizeof relname_list);
1709         if (!relname_list) {
1710                 if (!(relname_list = new0(item_list)))
1711                         out_of_memory("send_implied_dirs");
1712                 memcpy(F_DIR_RELNAMES_P(lastpath_struct), &relname_list, sizeof relname_list);
1713         }
1714         rnpp = EXPAND_ITEM_LIST(relname_list, relnamecache *, 32);
1715         if (!(*rnpp = (relnamecache*)new_array(char, sizeof (relnamecache) + len)))
1716                 out_of_memory("send_implied_dirs");
1717         (*rnpp)->name_type = name_type;
1718         strlcpy((*rnpp)->fname, limit+1, len + 1);
1719
1720 done:
1721         filter_list = save_filter_list;
1722 }
1723
1724 static void send1extra(int f, struct file_struct *file, struct file_list *flist)
1725 {
1726         char fbuf[MAXPATHLEN];
1727         item_list *relname_list;
1728         int len, dlen, flags = FLAG_DIVERT_DIRS | FLAG_CONTENT_DIR;
1729         size_t j;
1730
1731         f_name(file, fbuf);
1732         dlen = strlen(fbuf);
1733
1734         if (!change_pathname(file, NULL, 0))
1735                 exit_cleanup(RERR_FILESELECT);
1736
1737         change_local_filter_dir(fbuf, dlen, send_dir_depth);
1738
1739         if (file->flags & FLAG_CONTENT_DIR) {
1740                 if (one_file_system) {
1741                         STRUCT_STAT st;
1742                         if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1743                                 io_error |= IOERR_GENERAL;
1744                                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
1745                                         full_fname(fbuf));
1746                                 return;
1747                         }
1748                         filesystem_dev = st.st_dev;
1749                 }
1750                 send_directory(f, flist, fbuf, dlen, flags);
1751         }
1752
1753         if (!relative_paths)
1754                 return;
1755
1756         memcpy(&relname_list, F_DIR_RELNAMES_P(file), sizeof relname_list);
1757         if (!relname_list)
1758                 return;
1759
1760         for (j = 0; j < relname_list->count; j++) {
1761                 char *slash;
1762                 relnamecache *rnp = ((relnamecache**)relname_list->items)[j];
1763                 char name_type = rnp->name_type;
1764
1765                 fbuf[dlen] = '/';
1766                 len = strlcpy(fbuf + dlen + 1, rnp->fname, sizeof fbuf - dlen - 1);
1767                 free(rnp);
1768                 if (len >= (int)sizeof fbuf)
1769                         continue; /* Impossible... */
1770
1771                 slash = strchr(fbuf+dlen+1, '/');
1772                 if (slash) {
1773                         send_implied_dirs(f, flist, fbuf, fbuf+dlen+1, slash, flags, name_type);
1774                         continue;
1775                 }
1776
1777                 if (name_type != NORMAL_NAME) {
1778                         STRUCT_STAT st;
1779                         if (link_stat(fbuf, &st, 1) != 0) {
1780                                 io_error |= IOERR_GENERAL;
1781                                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
1782                                         full_fname(fbuf));
1783                                 continue;
1784                         }
1785                         send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR | flags, ALL_FILTERS);
1786                 } else
1787                         send_file_name(f, flist, fbuf, NULL, FLAG_TOP_DIR | flags, ALL_FILTERS);
1788         }
1789
1790         free(relname_list);
1791 }
1792
1793 void send_extra_file_list(int f, int at_least)
1794 {
1795         struct file_list *flist;
1796         int64 start_write;
1797         uint16 prev_flags;
1798         int old_cnt, save_io_error = io_error;
1799
1800         if (flist_eof)
1801                 return;
1802
1803         /* Keep sending data until we have the requested number of
1804          * files in the upcoming file-lists. */
1805         old_cnt = cur_flist->used;
1806         for (flist = first_flist; flist != cur_flist; flist = flist->next)
1807                 old_cnt += flist->used;
1808         while (file_total - old_cnt < at_least) {
1809                 struct file_struct *file = dir_flist->sorted[send_dir_ndx];
1810                 int dir_ndx, dstart = dir_count;
1811                 const char *pathname = F_PATHNAME(file);
1812                 int32 *dp;
1813
1814                 flist = flist_new(0, "send_extra_file_list");
1815                 start_write = stats.total_written;
1816
1817                 if (unsort_ndx)
1818                         dir_ndx = F_NDX(file);
1819                 else
1820                         dir_ndx = send_dir_ndx;
1821                 write_ndx(f, NDX_FLIST_OFFSET - dir_ndx);
1822                 flist->parent_ndx = dir_ndx;
1823
1824                 send1extra(f, file, flist);
1825                 prev_flags = file->flags;
1826                 dp = F_DIR_NODE_P(file);
1827
1828                 /* If there are any duplicate directory names that follow, we
1829                  * send all the dirs together in one file-list.  The dir_flist
1830                  * tree links all the child subdirs onto the last dup dir. */
1831                 while ((dir_ndx = DIR_NEXT_SIBLING(dp)) >= 0
1832                     && dir_flist->sorted[dir_ndx]->flags & FLAG_DUPLICATE) {
1833                         send_dir_ndx = dir_ndx;
1834                         file = dir_flist->sorted[dir_ndx];
1835                         /* Try to avoid some duplicate scanning of identical dirs. */
1836                         if (F_PATHNAME(file) == pathname && prev_flags & FLAG_CONTENT_DIR)
1837                                 file->flags &= ~FLAG_CONTENT_DIR;
1838                         send1extra(f, file, flist);
1839                         prev_flags = file->flags;
1840                         dp = F_DIR_NODE_P(file);
1841                 }
1842
1843                 write_byte(f, 0);
1844
1845                 if (need_unsorted_flist) {
1846                         if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
1847                                 out_of_memory("send_extra_file_list");
1848                         memcpy(flist->sorted, flist->files,
1849                                flist->used * sizeof (struct file_struct*));
1850                 } else
1851                         flist->sorted = flist->files;
1852
1853                 flist_sort_and_clean(flist, 0);
1854
1855                 add_dirs_to_tree(send_dir_ndx, flist, dir_count - dstart);
1856                 flist_done_allocating(flist);
1857
1858                 file_total += flist->used;
1859                 stats.flist_size += stats.total_written - start_write;
1860                 stats.num_files += flist->used;
1861                 if (DEBUG_GTE(FLIST, 3))
1862                         output_flist(flist);
1863
1864                 if (DIR_FIRST_CHILD(dp) >= 0) {
1865                         send_dir_ndx = DIR_FIRST_CHILD(dp);
1866                         send_dir_depth++;
1867                 } else {
1868                         while (DIR_NEXT_SIBLING(dp) < 0) {
1869                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
1870                                         write_ndx(f, NDX_FLIST_EOF);
1871                                         flist_eof = 1;
1872                                         change_local_filter_dir(NULL, 0, 0);
1873                                         goto finish;
1874                                 }
1875                                 send_dir_depth--;
1876                                 file = dir_flist->sorted[send_dir_ndx];
1877                                 dp = F_DIR_NODE_P(file);
1878                         }
1879                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
1880                 }
1881         }
1882
1883   finish:
1884         if (io_error != save_io_error && !ignore_errors)
1885                 send_msg_int(MSG_IO_ERROR, io_error);
1886 }
1887
1888 struct file_list *send_file_list(int f, int argc, char *argv[])
1889 {
1890         static const char *lastdir;
1891         static int lastdir_len = -1;
1892         int len, dirlen;
1893         STRUCT_STAT st;
1894         char *p, *dir;
1895         struct file_list *flist;
1896         struct timeval start_tv, end_tv;
1897         int64 start_write;
1898         int use_ff_fd = 0;
1899         int disable_buffering;
1900         int flags = recurse ? FLAG_CONTENT_DIR : 0;
1901         int reading_remotely = filesfrom_host != NULL;
1902         int rl_flags = (reading_remotely ? 0 : RL_DUMP_COMMENTS)
1903 #ifdef ICONV_OPTION
1904                      | (filesfrom_convert ? RL_CONVERT : 0)
1905 #endif
1906                      | (eol_nulls || reading_remotely ? RL_EOL_NULLS : 0);
1907         int implied_dot_dir = 0;
1908
1909         rprintf(FLOG, "building file list\n");
1910         if (show_filelist_p())
1911                 start_filelist_progress("building file list");
1912         else if (inc_recurse && INFO_GTE(FLIST, 1) && !am_server)
1913                 rprintf(FCLIENT, "sending incremental file list\n");
1914
1915         start_write = stats.total_written;
1916         gettimeofday(&start_tv, NULL);
1917
1918         if (!orig_dir)
1919                 orig_dir = strdup(curr_dir);
1920
1921         if (relative_paths && protocol_version >= 30)
1922                 implied_dirs = 1; /* We send flagged implied dirs */
1923
1924 #ifdef SUPPORT_HARD_LINKS
1925         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
1926                 init_hard_links();
1927 #endif
1928
1929         flist = cur_flist = flist_new(0, "send_file_list");
1930         if (inc_recurse) {
1931                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
1932                 flags |= FLAG_DIVERT_DIRS;
1933         } else
1934                 dir_flist = cur_flist;
1935
1936         disable_buffering = io_start_buffering_out(f);
1937         if (filesfrom_fd >= 0) {
1938                 if (argv[0] && !change_dir(argv[0], CD_NORMAL)) {
1939                         rsyserr(FERROR_XFER, errno, "change_dir %s failed",
1940                                 full_fname(argv[0]));
1941                         exit_cleanup(RERR_FILESELECT);
1942                 }
1943                 use_ff_fd = 1;
1944         }
1945
1946         while (1) {
1947                 char fbuf[MAXPATHLEN], *fn, name_type;
1948
1949                 if (use_ff_fd) {
1950                         if (read_line(filesfrom_fd, fbuf, sizeof fbuf, rl_flags) == 0)
1951                                 break;
1952                         sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
1953                 } else {
1954                         if (argc-- == 0)
1955                                 break;
1956                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1957                         if (sanitize_paths)
1958                                 sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
1959                 }
1960
1961                 len = strlen(fbuf);
1962                 if (relative_paths) {
1963                         /* We clean up fbuf below. */
1964                         name_type = NORMAL_NAME;
1965                 } else if (!len || fbuf[len - 1] == '/') {
1966                         if (len == 2 && fbuf[0] == '.') {
1967                                 /* Turn "./" into just "." rather than "./." */
1968                                 fbuf[--len] = '\0';
1969                         } else {
1970                                 if (len + 1 >= MAXPATHLEN)
1971                                         overflow_exit("send_file_list");
1972                                 fbuf[len++] = '.';
1973                                 fbuf[len] = '\0';
1974                         }
1975                         name_type = DOTDIR_NAME;
1976                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1977                     && (len == 2 || fbuf[len-3] == '/')) {
1978                         if (len + 2 >= MAXPATHLEN)
1979                                 overflow_exit("send_file_list");
1980                         fbuf[len++] = '/';
1981                         fbuf[len++] = '.';
1982                         fbuf[len] = '\0';
1983                         name_type = DOTDIR_NAME;
1984                 } else if (fbuf[len-1] == '.' && (len == 1 || fbuf[len-2] == '/'))
1985                         name_type = DOTDIR_NAME;
1986                 else
1987                         name_type = NORMAL_NAME;
1988
1989                 dir = NULL;
1990
1991                 if (!relative_paths) {
1992                         p = strrchr(fbuf, '/');
1993                         if (p) {
1994                                 *p = '\0';
1995                                 if (p == fbuf)
1996                                         dir = "/";
1997                                 else
1998                                         dir = fbuf;
1999                                 len -= p - fbuf + 1;
2000                                 fn = p + 1;
2001                         } else
2002                                 fn = fbuf;
2003                 } else {
2004                         if ((p = strstr(fbuf, "/./")) != NULL) {
2005                                 *p = '\0';
2006                                 if (p == fbuf)
2007                                         dir = "/";
2008                                 else {
2009                                         dir = fbuf;
2010                                         clean_fname(dir, 0);
2011                                 }
2012                                 fn = p + 3;
2013                                 while (*fn == '/')
2014                                         fn++;
2015                                 if (!*fn)
2016                                         *--fn = '\0'; /* ensure room for '.' */
2017                         } else
2018                                 fn = fbuf;
2019                         /* A leading ./ can be used in relative mode to affect
2020                          * the dest dir without its name being in the path. */
2021                         if (*fn == '.' && fn[1] == '/' && !implied_dot_dir) {
2022                                 send_file_name(f, flist, ".", NULL,
2023                                     (flags | FLAG_IMPLIED_DIR) & ~FLAG_CONTENT_DIR,
2024                                     ALL_FILTERS);
2025                                 implied_dot_dir = 1;
2026                         }
2027                         len = clean_fname(fn, CFN_KEEP_TRAILING_SLASH
2028                                             | CFN_DROP_TRAILING_DOT_DIR);
2029                         if (len == 1) {
2030                                 if (fn[0] == '/') {
2031                                         fn = "/.";
2032                                         len = 2;
2033                                         name_type = DOTDIR_NAME;
2034                                 } else if (fn[0] == '.')
2035                                         name_type = DOTDIR_NAME;
2036                         } else if (fn[len-1] == '/') {
2037                                 fn[--len] = '\0';
2038                                 if (len == 1 && *fn == '.')
2039                                         name_type = DOTDIR_NAME;
2040                                 else
2041                                         name_type = SLASH_ENDING_NAME;
2042                         }
2043                         /* Reject a ".." dir in the active part of the path. */
2044                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
2045                                 if ((p[2] == '/' || p[2] == '\0')
2046                                  && (p == fn || p[-1] == '/')) {
2047                                         rprintf(FERROR,
2048                                             "found \"..\" dir in relative path: %s\n",
2049                                             fn);
2050                                         exit_cleanup(RERR_SYNTAX);
2051                                 }
2052                         }
2053                 }
2054
2055                 if (!*fn) {
2056                         len = 1;
2057                         fn = ".";
2058                         name_type = DOTDIR_NAME;
2059                 }
2060
2061                 dirlen = dir ? strlen(dir) : 0;
2062                 if (dirlen != lastdir_len || memcmp(lastdir, dir, dirlen) != 0) {
2063                         if (!change_pathname(NULL, dir, -dirlen))
2064                                 continue;
2065                         lastdir = pathname;
2066                         lastdir_len = pathname_len;
2067                 } else if (!change_pathname(NULL, lastdir, lastdir_len))
2068                         continue;
2069
2070                 if (fn != fbuf)
2071                         memmove(fbuf, fn, len + 1);
2072
2073                 if (link_stat(fbuf, &st, copy_dirlinks || name_type != NORMAL_NAME) != 0
2074                  || (name_type != DOTDIR_NAME && is_daemon_excluded(fbuf, S_ISDIR(st.st_mode)))
2075                  || (relative_paths && path_is_daemon_excluded(fbuf, 1))) {
2076                         io_error |= IOERR_GENERAL;
2077                         rsyserr(FERROR_XFER, errno, "link_stat %s failed",
2078                                 full_fname(fbuf));
2079                         continue;
2080                 }
2081
2082                 /* A dot-dir should not be excluded! */
2083                 if (name_type != DOTDIR_NAME
2084                  && is_excluded(fbuf, S_ISDIR(st.st_mode) != 0, ALL_FILTERS))
2085                         continue;
2086
2087                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
2088                         rprintf(FINFO, "skipping directory %s\n", fbuf);
2089                         continue;
2090                 }
2091
2092                 if (inc_recurse && relative_paths && *fbuf) {
2093                         if ((p = strchr(fbuf+1, '/')) != NULL) {
2094                                 if (p - fbuf == 1 && *fbuf == '.') {
2095                                         if ((fn = strchr(p+1, '/')) != NULL)
2096                                                 p = fn;
2097                                 } else
2098                                         fn = p;
2099                                 send_implied_dirs(f, flist, fbuf, fbuf, p, flags, name_type);
2100                                 if (fn == p)
2101                                         continue;
2102                         }
2103                 } else if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
2104                         /* Send the implied directories at the start of the
2105                          * source spec, so we get their permissions right. */
2106                         send_implied_dirs(f, flist, fbuf, fbuf, p, flags, 0);
2107                 }
2108
2109                 if (one_file_system)
2110                         filesystem_dev = st.st_dev;
2111
2112                 if (recurse || (xfer_dirs && name_type != NORMAL_NAME)) {
2113                         struct file_struct *file;
2114                         file = send_file_name(f, flist, fbuf, &st,
2115                                               FLAG_TOP_DIR | FLAG_CONTENT_DIR | flags,
2116                                               NO_FILTERS);
2117                         if (!file)
2118                                 continue;
2119                         if (inc_recurse) {
2120                                 if (name_type == DOTDIR_NAME) {
2121                                         if (send_dir_depth < 0) {
2122                                                 send_dir_depth = 0;
2123                                                 change_local_filter_dir(fbuf, len, send_dir_depth);
2124                                         }
2125                                         send_directory(f, flist, fbuf, len, flags);
2126                                 }
2127                         } else
2128                                 send_if_directory(f, flist, file, fbuf, len, flags);
2129                 } else
2130                         send_file_name(f, flist, fbuf, &st, flags, NO_FILTERS);
2131         }
2132
2133         gettimeofday(&end_tv, NULL);
2134         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2135                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2136         if (stats.flist_buildtime == 0)
2137                 stats.flist_buildtime = 1;
2138         start_tv = end_tv;
2139
2140         write_byte(f, 0); /* Indicate end of file list */
2141
2142 #ifdef SUPPORT_HARD_LINKS
2143         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
2144                 idev_destroy();
2145 #endif
2146
2147         if (show_filelist_p())
2148                 finish_filelist_progress(flist);
2149
2150         gettimeofday(&end_tv, NULL);
2151         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2152                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2153
2154         /* When converting names, both sides keep an unsorted file-list array
2155          * because the names will differ on the sending and receiving sides
2156          * (both sides will use the unsorted index number for each item). */
2157
2158         /* Sort the list without removing any duplicates.  This allows the
2159          * receiving side to ask for whatever name it kept.  For incremental
2160          * recursion mode, the sender marks duplicate dirs so that it can
2161          * send them together in a single file-list. */
2162         if (need_unsorted_flist) {
2163                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2164                         out_of_memory("send_file_list");
2165                 memcpy(flist->sorted, flist->files,
2166                        flist->used * sizeof (struct file_struct*));
2167         } else
2168                 flist->sorted = flist->files;
2169         flist_sort_and_clean(flist, 0);
2170         file_total += flist->used;
2171
2172         if (numeric_ids <= 0 && !inc_recurse)
2173                 send_id_list(f);
2174
2175         /* send the io_error flag */
2176         if (protocol_version < 30)
2177                 write_int(f, ignore_errors ? 0 : io_error);
2178         else if (io_error && !ignore_errors)
2179                 send_msg_int(MSG_IO_ERROR, io_error);
2180
2181         if (disable_buffering)
2182                 io_end_buffering_out();
2183
2184         stats.flist_size = stats.total_written - start_write;
2185         stats.num_files = flist->used;
2186
2187         if (DEBUG_GTE(FLIST, 3))
2188                 output_flist(flist);
2189
2190         if (DEBUG_GTE(FLIST, 2))
2191                 rprintf(FINFO, "send_file_list done\n");
2192
2193         if (inc_recurse) {
2194                 send_dir_depth = 1;
2195                 add_dirs_to_tree(-1, flist, dir_count);
2196                 if (!file_total || strcmp(flist->sorted[0]->basename, ".") != 0)
2197                         flist->parent_ndx = -1;
2198                 flist_done_allocating(flist);
2199                 if (send_dir_ndx < 0) {
2200                         write_ndx(f, NDX_FLIST_EOF);
2201                         flist_eof = 1;
2202                 }
2203                 else if (file_total == 1) {
2204                         /* If we're creating incremental file-lists and there
2205                          * was just 1 item in the first file-list, send 1 more
2206                          * file-list to check if this is a 1-file xfer. */
2207                         send_extra_file_list(f, 1);
2208                 }
2209         }
2210
2211         return flist;
2212 }
2213
2214 struct file_list *recv_file_list(int f)
2215 {
2216         struct file_list *flist;
2217         int dstart, flags;
2218         int64 start_read;
2219
2220         if (!first_flist) {
2221                 if (show_filelist_p())
2222                         start_filelist_progress("receiving file list");
2223                 else if (inc_recurse && INFO_GTE(FLIST, 1) && !am_server)
2224                         rprintf(FCLIENT, "receiving incremental file list\n");
2225                 rprintf(FLOG, "receiving file list\n");
2226         }
2227
2228         start_read = stats.total_read;
2229
2230 #ifdef SUPPORT_HARD_LINKS
2231         if (preserve_hard_links && !first_flist)
2232                 init_hard_links();
2233 #endif
2234
2235         flist = flist_new(0, "recv_file_list");
2236
2237         if (inc_recurse) {
2238                 if (flist->ndx_start == 1)
2239                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
2240                 dstart = dir_flist->used;
2241         } else {
2242                 dir_flist = flist;
2243                 dstart = 0;
2244         }
2245
2246         while ((flags = read_byte(f)) != 0) {
2247                 struct file_struct *file;
2248
2249                 flist_expand(flist, 1);
2250
2251                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
2252                         flags |= read_byte(f) << 8;
2253                 file = recv_file_entry(flist, flags, f);
2254
2255                 if (inc_recurse && S_ISDIR(file->mode)) {
2256                         flist_expand(dir_flist, 1);
2257                         dir_flist->files[dir_flist->used++] = file;
2258                 }
2259
2260                 flist->files[flist->used++] = file;
2261
2262                 maybe_emit_filelist_progress(flist->used);
2263
2264                 if (DEBUG_GTE(FLIST, 2)) {
2265                         rprintf(FINFO, "recv_file_name(%s)\n",
2266                                 f_name(file, NULL));
2267                 }
2268         }
2269         file_total += flist->used;
2270
2271         if (DEBUG_GTE(FLIST, 2))
2272                 rprintf(FINFO, "received %d names\n", flist->used);
2273
2274         if (show_filelist_p())
2275                 finish_filelist_progress(flist);
2276
2277         if (need_unsorted_flist) {
2278                 /* Create an extra array of index pointers that we can sort for
2279                  * the generator's use (for wading through the files in sorted
2280                  * order and for calling flist_find()).  We keep the "files"
2281                  * list unsorted for our exchange of index numbers with the
2282                  * other side (since their names may not sort the same). */
2283                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2284                         out_of_memory("recv_file_list");
2285                 memcpy(flist->sorted, flist->files,
2286                        flist->used * sizeof (struct file_struct*));
2287                 if (inc_recurse && dir_flist->used > dstart) {
2288                         static int dir_flist_malloced = 0;
2289                         if (dir_flist_malloced < dir_flist->malloced) {
2290                                 dir_flist->sorted = realloc_array(dir_flist->sorted,
2291                                                         struct file_struct *,
2292                                                         dir_flist->malloced);
2293                                 dir_flist_malloced = dir_flist->malloced;
2294                         }
2295                         memcpy(dir_flist->sorted + dstart, dir_flist->files + dstart,
2296                                (dir_flist->used - dstart) * sizeof (struct file_struct*));
2297                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2298                 }
2299         } else {
2300                 flist->sorted = flist->files;
2301                 if (inc_recurse && dir_flist->used > dstart) {
2302                         dir_flist->sorted = dir_flist->files;
2303                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2304                 }
2305         }
2306
2307         if (inc_recurse)
2308                 flist_done_allocating(flist);
2309         else if (f >= 0)
2310                 recv_id_list(f, flist);
2311
2312         flist_sort_and_clean(flist, relative_paths);
2313
2314         if (protocol_version < 30) {
2315                 /* Recv the io_error flag */
2316                 if (ignore_errors)
2317                         read_int(f);
2318                 else
2319                         io_error |= read_int(f);
2320         } else if (inc_recurse && flist->ndx_start == 1) {
2321                 if (!file_total || strcmp(flist->sorted[0]->basename, ".") != 0)
2322                         flist->parent_ndx = -1;
2323         }
2324
2325         if (DEBUG_GTE(FLIST, 3))
2326                 output_flist(flist);
2327
2328         if (DEBUG_GTE(FLIST, 2))
2329                 rprintf(FINFO, "recv_file_list done\n");
2330
2331         stats.flist_size += stats.total_read - start_read;
2332         stats.num_files += flist->used;
2333
2334         return flist;
2335 }
2336
2337 /* This is only used once by the receiver if the very first file-list
2338  * has exactly one item in it. */
2339 void recv_additional_file_list(int f)
2340 {
2341         struct file_list *flist;
2342         int ndx = read_ndx(f);
2343         if (ndx == NDX_FLIST_EOF) {
2344                 flist_eof = 1;
2345                 change_local_filter_dir(NULL, 0, 0);
2346         } else {
2347                 ndx = NDX_FLIST_OFFSET - ndx;
2348                 if (ndx < 0 || ndx >= dir_flist->used) {
2349                         ndx = NDX_FLIST_OFFSET - ndx;
2350                         rprintf(FERROR,
2351                                 "[%s] Invalid dir index: %d (%d - %d)\n",
2352                                 who_am_i(), ndx, NDX_FLIST_OFFSET,
2353                                 NDX_FLIST_OFFSET - dir_flist->used + 1);
2354                         exit_cleanup(RERR_PROTOCOL);
2355                 }
2356                 if (DEBUG_GTE(FLIST, 3)) {
2357                         rprintf(FINFO, "[%s] receiving flist for dir %d\n",
2358                                 who_am_i(), ndx);
2359                 }
2360                 flist = recv_file_list(f);
2361                 flist->parent_ndx = ndx;
2362         }
2363 }
2364
2365 /* Search for an identically-named item in the file list.  Note that the
2366  * items must agree in their directory-ness, or no match is returned. */
2367 int flist_find(struct file_list *flist, struct file_struct *f)
2368 {
2369         int low = flist->low, high = flist->high;
2370         int diff, mid, mid_up;
2371
2372         while (low <= high) {
2373                 mid = (low + high) / 2;
2374                 if (F_IS_ACTIVE(flist->sorted[mid]))
2375                         mid_up = mid;
2376                 else {
2377                         /* Scan for the next non-empty entry using the cached
2378                          * distance values.  If the value isn't fully up-to-
2379                          * date, update it. */
2380                         mid_up = mid + F_DEPTH(flist->sorted[mid]);
2381                         if (!F_IS_ACTIVE(flist->sorted[mid_up])) {
2382                                 do {
2383                                     mid_up += F_DEPTH(flist->sorted[mid_up]);
2384                                 } while (!F_IS_ACTIVE(flist->sorted[mid_up]));
2385                                 F_DEPTH(flist->sorted[mid]) = mid_up - mid;
2386                         }
2387                         if (mid_up > high) {
2388                                 /* If there's nothing left above us, set high to
2389                                  * a non-empty entry below us and continue. */
2390                                 high = mid - (int)flist->sorted[mid]->len32;
2391                                 if (!F_IS_ACTIVE(flist->sorted[high])) {
2392                                         do {
2393                                             high -= (int)flist->sorted[high]->len32;
2394                                         } while (!F_IS_ACTIVE(flist->sorted[high]));
2395                                         flist->sorted[mid]->len32 = mid - high;
2396                                 }
2397                                 continue;
2398                         }
2399                 }
2400                 diff = f_name_cmp(flist->sorted[mid_up], f);
2401                 if (diff == 0) {
2402                         if (protocol_version < 29
2403                             && S_ISDIR(flist->sorted[mid_up]->mode)
2404                             != S_ISDIR(f->mode))
2405                                 return -1;
2406                         return mid_up;
2407                 }
2408                 if (diff < 0)
2409                         low = mid_up + 1;
2410                 else
2411                         high = mid - 1;
2412         }
2413         return -1;
2414 }
2415
2416 /*
2417  * Free up any resources a file_struct has allocated
2418  * and clear the file.
2419  */
2420 void clear_file(struct file_struct *file)
2421 {
2422         /* The +1 zeros out the first char of the basename. */
2423         memset(file, 0, FILE_STRUCT_LEN + 1);
2424         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
2425          * entry.  Likewise for len32 in the opposite direction.  We assume
2426          * that we're alone for now since flist_find() will adjust the counts
2427          * it runs into that aren't up-to-date. */
2428         file->len32 = F_DEPTH(file) = 1;
2429 }
2430
2431 /* Allocate a new file list. */
2432 struct file_list *flist_new(int flags, char *msg)
2433 {
2434         struct file_list *flist;
2435
2436         if (!(flist = new0(struct file_list)))
2437                 out_of_memory(msg);
2438
2439         if (flags & FLIST_TEMP) {
2440                 if (!(flist->file_pool = pool_create(SMALL_EXTENT, 0,
2441                                                      out_of_memory,
2442                                                      POOL_INTERN)))
2443                         out_of_memory(msg);
2444         } else {
2445                 /* This is a doubly linked list with prev looping back to
2446                  * the end of the list, but the last next pointer is NULL. */
2447                 if (!first_flist) {
2448                         flist->file_pool = pool_create(NORMAL_EXTENT, 0,
2449                                                        out_of_memory,
2450                                                        POOL_INTERN);
2451                         if (!flist->file_pool)
2452                                 out_of_memory(msg);
2453
2454                         flist->ndx_start = flist->flist_num = inc_recurse ? 1 : 0;
2455
2456                         first_flist = cur_flist = flist->prev = flist;
2457                 } else {
2458                         struct file_list *prev = first_flist->prev;
2459
2460                         flist->file_pool = first_flist->file_pool;
2461
2462                         flist->ndx_start = prev->ndx_start + prev->used + 1;
2463                         flist->flist_num = prev->flist_num + 1;
2464
2465                         flist->prev = prev;
2466                         prev->next = first_flist->prev = flist;
2467                 }
2468                 flist->pool_boundary = pool_boundary(flist->file_pool, 0);
2469                 flist_cnt++;
2470         }
2471
2472         return flist;
2473 }
2474
2475 /* Free up all elements in a flist. */
2476 void flist_free(struct file_list *flist)
2477 {
2478         if (!flist->prev) {
2479                 /* Was FLIST_TEMP dir-list. */
2480         } else if (flist == flist->prev) {
2481                 first_flist = cur_flist = NULL;
2482                 file_total = 0;
2483                 flist_cnt = 0;
2484         } else {
2485                 if (flist == cur_flist)
2486                         cur_flist = flist->next;
2487                 if (flist == first_flist)
2488                         first_flist = first_flist->next;
2489                 else {
2490                         flist->prev->next = flist->next;
2491                         if (!flist->next)
2492                                 flist->next = first_flist;
2493                 }
2494                 flist->next->prev = flist->prev;
2495                 file_total -= flist->used;
2496                 flist_cnt--;
2497         }
2498
2499         if (!flist->prev || !flist_cnt)
2500                 pool_destroy(flist->file_pool);
2501         else
2502                 pool_free_old(flist->file_pool, flist->pool_boundary);
2503
2504         if (flist->sorted && flist->sorted != flist->files)
2505                 free(flist->sorted);
2506         free(flist->files);
2507         free(flist);
2508 }
2509
2510 /* This routine ensures we don't have any duplicate names in our file list.
2511  * duplicate names can cause corruption because of the pipelining. */
2512 static void flist_sort_and_clean(struct file_list *flist, int strip_root)
2513 {
2514         char fbuf[MAXPATHLEN];
2515         int i, prev_i;
2516
2517         if (!flist)
2518                 return;
2519         if (flist->used == 0) {
2520                 flist->high = -1;
2521                 flist->low = 0;
2522                 return;
2523         }
2524
2525         fsort(flist->sorted, flist->used);
2526
2527         if (!am_sender || inc_recurse) {
2528                 for (i = prev_i = 0; i < flist->used; i++) {
2529                         if (F_IS_ACTIVE(flist->sorted[i])) {
2530                                 prev_i = i;
2531                                 break;
2532                         }
2533                 }
2534                 flist->low = prev_i;
2535         } else {
2536                 i = prev_i = flist->used - 1;
2537                 flist->low = 0;
2538         }
2539
2540         while (++i < flist->used) {
2541                 int j;
2542                 struct file_struct *file = flist->sorted[i];
2543
2544                 if (!F_IS_ACTIVE(file))
2545                         continue;
2546                 if (f_name_cmp(file, flist->sorted[prev_i]) == 0)
2547                         j = prev_i;
2548                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
2549                         int save_mode = file->mode;
2550                         /* Make sure that this directory doesn't duplicate a
2551                          * non-directory earlier in the list. */
2552                         flist->high = prev_i;
2553                         file->mode = S_IFREG;
2554                         j = flist_find(flist, file);
2555                         file->mode = save_mode;
2556                 } else
2557                         j = -1;
2558                 if (j >= 0) {
2559                         int keep, drop;
2560                         /* If one is a dir and the other is not, we want to
2561                          * keep the dir because it might have contents in the
2562                          * list.  Otherwise keep the first one. */
2563                         if (S_ISDIR(file->mode)) {
2564                                 struct file_struct *fp = flist->sorted[j];
2565                                 if (!S_ISDIR(fp->mode))
2566                                         keep = i, drop = j;
2567                                 else {
2568                                         if (am_sender)
2569                                                 file->flags |= FLAG_DUPLICATE;
2570                                         else { /* Make sure we merge our vital flags. */
2571                                                 fp->flags |= file->flags & (FLAG_TOP_DIR|FLAG_CONTENT_DIR);
2572                                                 fp->flags &= file->flags | ~FLAG_IMPLIED_DIR;
2573                                         }
2574                                         keep = j, drop = i;
2575                                 }
2576                         } else
2577                                 keep = j, drop = i;
2578
2579                         if (!am_sender) {
2580                                 if (DEBUG_GTE(DUP, 1)) {
2581                                         rprintf(FINFO,
2582                                             "removing duplicate name %s from file list (%d)\n",
2583                                             f_name(file, fbuf), drop + flist->ndx_start);
2584                                 }
2585                                 clear_file(flist->sorted[drop]);
2586                         }
2587
2588                         if (keep == i) {
2589                                 if (flist->low == drop) {
2590                                         for (j = drop + 1;
2591                                              j < i && !F_IS_ACTIVE(flist->sorted[j]);
2592                                              j++) {}
2593                                         flist->low = j;
2594                                 }
2595                                 prev_i = i;
2596                         }
2597                 } else
2598                         prev_i = i;
2599         }
2600         flist->high = prev_i;
2601
2602         if (strip_root) {
2603                 /* We need to strip off the leading slashes for relative
2604                  * paths, but this must be done _after_ the sorting phase. */
2605                 for (i = flist->low; i <= flist->high; i++) {
2606                         struct file_struct *file = flist->sorted[i];
2607
2608                         if (!file->dirname)
2609                                 continue;
2610                         while (*file->dirname == '/')
2611                                 file->dirname++;
2612                         if (!*file->dirname)
2613                                 file->dirname = NULL;
2614                 }
2615         }
2616
2617         if (prune_empty_dirs && !am_sender) {
2618                 int j, prev_depth = 0;
2619
2620                 prev_i = 0; /* It's OK that this isn't really true. */
2621
2622                 for (i = flist->low; i <= flist->high; i++) {
2623                         struct file_struct *fp, *file = flist->sorted[i];
2624
2625                         /* This temporarily abuses the F_DEPTH() value for a
2626                          * directory that is in a chain that might get pruned.
2627                          * We restore the old value if it gets a reprieve. */
2628                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2629                                 /* Dump empty dirs when coming back down. */
2630                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2631                                         fp = flist->sorted[prev_i];
2632                                         if (F_DEPTH(fp) >= 0)
2633                                                 break;
2634                                         prev_i = -F_DEPTH(fp)-1;
2635                                         clear_file(fp);
2636                                 }
2637                                 prev_depth = F_DEPTH(file);
2638                                 if (is_excluded(f_name(file, fbuf), 1,
2639                                                        ALL_FILTERS)) {
2640                                         /* Keep dirs through this dir. */
2641                                         for (j = prev_depth-1; ; j--) {
2642                                                 fp = flist->sorted[prev_i];
2643                                                 if (F_DEPTH(fp) >= 0)
2644                                                         break;
2645                                                 prev_i = -F_DEPTH(fp)-1;
2646                                                 F_DEPTH(fp) = j;
2647                                         }
2648                                 } else
2649                                         F_DEPTH(file) = -prev_i-1;
2650                                 prev_i = i;
2651                         } else {
2652                                 /* Keep dirs through this non-dir. */
2653                                 for (j = prev_depth; ; j--) {
2654                                         fp = flist->sorted[prev_i];
2655                                         if (F_DEPTH(fp) >= 0)
2656                                                 break;
2657                                         prev_i = -F_DEPTH(fp)-1;
2658                                         F_DEPTH(fp) = j;
2659                                 }
2660                         }
2661                 }
2662                 /* Dump all remaining empty dirs. */
2663                 while (1) {
2664                         struct file_struct *fp = flist->sorted[prev_i];
2665                         if (F_DEPTH(fp) >= 0)
2666                                 break;
2667                         prev_i = -F_DEPTH(fp)-1;
2668                         clear_file(fp);
2669                 }
2670
2671                 for (i = flist->low; i <= flist->high; i++) {
2672                         if (F_IS_ACTIVE(flist->sorted[i]))
2673                                 break;
2674                 }
2675                 flist->low = i;
2676                 for (i = flist->high; i >= flist->low; i--) {
2677                         if (F_IS_ACTIVE(flist->sorted[i]))
2678                                 break;
2679                 }
2680                 flist->high = i;
2681         }
2682 }
2683
2684 static void output_flist(struct file_list *flist)
2685 {
2686         char uidbuf[16], gidbuf[16], depthbuf[16];
2687         struct file_struct *file;
2688         const char *root, *dir, *slash, *name, *trail;
2689         const char *who = who_am_i();
2690         int i;
2691
2692         rprintf(FINFO, "[%s] flist start=%d, used=%d, low=%d, high=%d\n",
2693                 who, flist->ndx_start, flist->used, flist->low, flist->high);
2694         for (i = 0; i < flist->used; i++) {
2695                 file = flist->files[i];
2696                 if ((am_root || am_sender) && uid_ndx) {
2697                         snprintf(uidbuf, sizeof uidbuf, " uid=%u",
2698                                  F_OWNER(file));
2699                 } else
2700                         *uidbuf = '\0';
2701                 if (gid_ndx) {
2702                         static char parens[] = "(\0)\0\0\0";
2703                         char *pp = parens + (file->flags & FLAG_SKIP_GROUP ? 0 : 3);
2704                         snprintf(gidbuf, sizeof gidbuf, " gid=%s%u%s",
2705                                  pp, F_GROUP(file), pp + 2);
2706                 } else
2707                         *gidbuf = '\0';
2708                 if (!am_sender)
2709                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2710                 if (F_IS_ACTIVE(file)) {
2711                         root = am_sender ? NS(F_PATHNAME(file)) : depthbuf;
2712                         if ((dir = file->dirname) == NULL)
2713                                 dir = slash = "";
2714                         else
2715                                 slash = "/";
2716                         name = file->basename;
2717                         trail = S_ISDIR(file->mode) ? "/" : "";
2718                 } else
2719                         root = dir = slash = name = trail = "";
2720                 rprintf(FINFO,
2721                         "[%s] i=%d %s %s%s%s%s mode=0%o len=%s%s%s flags=%x\n",
2722                         who, i + flist->ndx_start,
2723                         root, dir, slash, name, trail,
2724                         (int)file->mode, big_num(F_LENGTH(file), 0),
2725                         uidbuf, gidbuf, file->flags);
2726         }
2727 }
2728
2729 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2730 enum fnc_type { t_PATH, t_ITEM };
2731
2732 static int found_prefix;
2733
2734 /* Compare the names of two file_struct entities, similar to how strcmp()
2735  * would do if it were operating on the joined strings.
2736  *
2737  * Some differences beginning with protocol_version 29: (1) directory names
2738  * are compared with an assumed trailing slash so that they compare in a
2739  * way that would cause them to sort immediately prior to any content they
2740  * may have; (2) a directory of any name compares after a non-directory of
2741  * any name at the same depth; (3) a directory with name "." compares prior
2742  * to anything else.  These changes mean that a directory and a non-dir
2743  * with the same name will not compare as equal (protocol_version >= 29).
2744  *
2745  * The dirname component can be an empty string, but the basename component
2746  * cannot (and never is in the current codebase).  The basename component
2747  * may be NULL (for a removed item), in which case it is considered to be
2748  * after any existing item. */
2749 int f_name_cmp(const struct file_struct *f1, const struct file_struct *f2)
2750 {
2751         int dif;
2752         const uchar *c1, *c2;
2753         enum fnc_state state1, state2;
2754         enum fnc_type type1, type2;
2755         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
2756
2757         if (!f1 || !F_IS_ACTIVE(f1)) {
2758                 if (!f2 || !F_IS_ACTIVE(f2))
2759                         return 0;
2760                 return -1;
2761         }
2762         if (!f2 || !F_IS_ACTIVE(f2))
2763                 return 1;
2764
2765         c1 = (uchar*)f1->dirname;
2766         c2 = (uchar*)f2->dirname;
2767         if (c1 == c2)
2768                 c1 = c2 = NULL;
2769         if (!c1) {
2770                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2771                 c1 = (const uchar*)f1->basename;
2772                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2773                         type1 = t_ITEM;
2774                         state1 = s_TRAILING;
2775                         c1 = (uchar*)"";
2776                 } else
2777                         state1 = s_BASE;
2778         } else {
2779                 type1 = t_path;
2780                 state1 = s_DIR;
2781         }
2782         if (!c2) {
2783                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2784                 c2 = (const uchar*)f2->basename;
2785                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2786                         type2 = t_ITEM;
2787                         state2 = s_TRAILING;
2788                         c2 = (uchar*)"";
2789                 } else
2790                         state2 = s_BASE;
2791         } else {
2792                 type2 = t_path;
2793                 state2 = s_DIR;
2794         }
2795
2796         if (type1 != type2)
2797                 return type1 == t_PATH ? 1 : -1;
2798
2799         do {
2800                 if (!*c1) {
2801                         switch (state1) {
2802                         case s_DIR:
2803                                 state1 = s_SLASH;
2804                                 c1 = (uchar*)"/";
2805                                 break;
2806                         case s_SLASH:
2807                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2808                                 c1 = (const uchar*)f1->basename;
2809                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2810                                         type1 = t_ITEM;
2811                                         state1 = s_TRAILING;
2812                                         c1 = (uchar*)"";
2813                                 } else
2814                                         state1 = s_BASE;
2815                                 break;
2816                         case s_BASE:
2817                                 state1 = s_TRAILING;
2818                                 if (type1 == t_PATH) {
2819                                         c1 = (uchar*)"/";
2820                                         break;
2821                                 }
2822                                 /* FALL THROUGH */
2823                         case s_TRAILING:
2824                                 type1 = t_ITEM;
2825                                 break;
2826                         }
2827                         if (*c2 && type1 != type2)
2828                                 return type1 == t_PATH ? 1 : -1;
2829                 }
2830                 if (!*c2) {
2831                         switch (state2) {
2832                         case s_DIR:
2833                                 state2 = s_SLASH;
2834                                 c2 = (uchar*)"/";
2835                                 break;
2836                         case s_SLASH:
2837                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2838                                 c2 = (const uchar*)f2->basename;
2839                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2840                                         type2 = t_ITEM;
2841                                         state2 = s_TRAILING;
2842                                         c2 = (uchar*)"";
2843                                 } else
2844                                         state2 = s_BASE;
2845                                 break;
2846                         case s_BASE:
2847                                 state2 = s_TRAILING;
2848                                 if (type2 == t_PATH) {
2849                                         c2 = (uchar*)"/";
2850                                         break;
2851                                 }
2852                                 /* FALL THROUGH */
2853                         case s_TRAILING:
2854                                 found_prefix = 1;
2855                                 if (!*c1)
2856                                         return 0;
2857                                 type2 = t_ITEM;
2858                                 break;
2859                         }
2860                         if (type1 != type2)
2861                                 return type1 == t_PATH ? 1 : -1;
2862                 }
2863         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
2864
2865         return dif;
2866 }
2867
2868 /* Returns 1 if f1's filename has all of f2's filename as a prefix.  This does
2869  * not match if f2's basename is not an exact match of a path element in f1.
2870  * E.g. /path/foo is not a prefix of /path/foobar/baz, but /path/foobar is. */
2871 int f_name_has_prefix(const struct file_struct *f1, const struct file_struct *f2)
2872 {
2873         found_prefix = 0;
2874         f_name_cmp(f1, f2);
2875         return found_prefix;
2876 }
2877
2878 char *f_name_buf(void)
2879 {
2880         static char names[5][MAXPATHLEN];
2881         static unsigned int n;
2882
2883         n = (n + 1) % (sizeof names / sizeof names[0]);
2884
2885         return names[n];
2886 }
2887
2888 /* Return a copy of the full filename of a flist entry, using the indicated
2889  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
2890  * done because we checked the size when creating the file_struct entry.
2891  */
2892 char *f_name(const struct file_struct *f, char *fbuf)
2893 {
2894         if (!f || !F_IS_ACTIVE(f))
2895                 return NULL;
2896
2897         if (!fbuf)
2898                 fbuf = f_name_buf();
2899
2900         if (f->dirname) {
2901                 int len = strlen(f->dirname);
2902                 memcpy(fbuf, f->dirname, len);
2903                 fbuf[len] = '/';
2904                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
2905         } else
2906                 strlcpy(fbuf, f->basename, MAXPATHLEN);
2907
2908         return fbuf;
2909 }
2910
2911 /* Do a non-recursive scan of the named directory, possibly ignoring all
2912  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
2913  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
2914  * buffer (the functions we call will append names onto the end, but the old
2915  * dir value will be restored on exit). */
2916 struct file_list *get_dirlist(char *dirname, int dlen, int ignore_filter_rules)
2917 {
2918         struct file_list *dirlist;
2919         char dirbuf[MAXPATHLEN];
2920         int save_recurse = recurse;
2921         int save_xfer_dirs = xfer_dirs;
2922         int save_prune_empty_dirs = prune_empty_dirs;
2923
2924         if (dlen < 0) {
2925                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
2926                 if (dlen >= MAXPATHLEN)
2927                         return NULL;
2928                 dirname = dirbuf;
2929         }
2930
2931         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
2932
2933         recurse = 0;
2934         xfer_dirs = 1;
2935         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen, 0);
2936         xfer_dirs = save_xfer_dirs;
2937         recurse = save_recurse;
2938         if (INFO_GTE(PROGRESS, 1))
2939                 flist_count_offset += dirlist->used;
2940
2941         prune_empty_dirs = 0;
2942         dirlist->sorted = dirlist->files;
2943         flist_sort_and_clean(dirlist, 0);
2944         prune_empty_dirs = save_prune_empty_dirs;
2945
2946         if (DEBUG_GTE(FLIST, 3))
2947                 output_flist(dirlist);
2948
2949         return dirlist;
2950 }