Move FLAG_DEL_NEEDS_UID into the "not stored" section.
[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) 2002-2009 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 verbose;
29 extern int am_root;
30 extern int am_server;
31 extern int am_daemon;
32 extern int am_sender;
33 extern int am_generator;
34 extern int inc_recurse;
35 extern int do_progress;
36 extern int always_checksum;
37 extern int module_id;
38 extern int ignore_errors;
39 extern int numeric_ids;
40 extern int recurse;
41 extern int use_qsort;
42 extern int xfer_dirs;
43 extern int filesfrom_fd;
44 extern int one_file_system;
45 extern int copy_dirlinks;
46 extern int preserve_uid;
47 extern int preserve_gid;
48 extern int preserve_acls;
49 extern int preserve_xattrs;
50 extern int preserve_links;
51 extern int preserve_hard_links;
52 extern int preserve_devices;
53 extern int preserve_specials;
54 extern int delete_during;
55 extern int eol_nulls;
56 extern int relative_paths;
57 extern int implied_dirs;
58 extern int ignore_perishable;
59 extern int non_perishable_cnt;
60 extern int prune_empty_dirs;
61 extern int copy_links;
62 extern int copy_unsafe_links;
63 extern int protocol_version;
64 extern int sanitize_paths;
65 extern int munge_symlinks;
66 extern int use_safe_inc_flist;
67 extern int need_unsorted_flist;
68 extern int sender_symlink_iconv;
69 extern int unsort_ndx;
70 extern struct stats stats;
71 extern char *filesfrom_host;
72
73 extern char curr_dir[MAXPATHLEN];
74
75 extern struct chmod_mode_struct *chmod_modes;
76
77 extern struct filter_list_struct filter_list;
78 extern struct filter_list_struct daemon_filter_list;
79
80 #ifdef ICONV_OPTION
81 extern int filesfrom_convert;
82 extern iconv_t ic_send, ic_recv;
83 #endif
84
85 #define PTR_SIZE (sizeof (struct file_struct *))
86
87 int io_error;
88 int checksum_len;
89 dev_t filesystem_dev; /* used to implement -x */
90
91 struct file_list *cur_flist, *first_flist, *dir_flist;
92 int send_dir_ndx = -1, send_dir_depth = -1;
93 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
94 int file_total = 0; /* total of all active items over all file-lists */
95 int flist_eof = 0; /* all the file-lists are now known */
96
97 #define NORMAL_NAME 0
98 #define SLASH_ENDING_NAME 1
99 #define DOTDIR_NAME 2
100
101 /* Starting from protocol version 26, we always use 64-bit ino_t and dev_t
102  * internally, even if this platform does not allow files to have 64-bit inums.
103  * The only exception is if we're on a platform with no 64-bit type at all.
104  *
105  * Because we use read_longint() to get these off the wire, if you transfer
106  * devices or (for protocols < 30) hardlinks with dev or inum > 2**32 to a
107  * machine with no 64-bit types then you will get an overflow error.
108  *
109  * Note that if you transfer devices from a 64-bit-devt machine (say, Solaris)
110  * to a 32-bit-devt machine (say, Linux-2.2/x86) then the device numbers will
111  * be truncated.  But it's a kind of silly thing to do anyhow. */
112
113 /* The tmp_* vars are used as a cache area by make_file() to store data
114  * that the sender doesn't need to remember in its file list.  The data
115  * will survive just long enough to be used by send_file_entry(). */
116 static dev_t tmp_rdev;
117 #ifdef SUPPORT_HARD_LINKS
118 static int64 tmp_dev = -1, tmp_ino;
119 #endif
120 static char tmp_sum[MAX_DIGEST_LEN];
121
122 static char empty_sum[MAX_DIGEST_LEN];
123 static int flist_count_offset; /* for --delete --progress */
124 static int dir_count = 0;
125
126 static void flist_sort_and_clean(struct file_list *flist, int strip_root);
127 static void output_flist(struct file_list *flist);
128
129 void init_flist(void)
130 {
131         if (verbose > 4) {
132                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
133                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
134         }
135         checksum_len = protocol_version < 21 ? 2
136                      : protocol_version < 30 ? MD4_DIGEST_LEN
137                      : MD5_DIGEST_LEN;
138 }
139
140 static int show_filelist_p(void)
141 {
142         return verbose && xfer_dirs && !am_server && !inc_recurse;
143 }
144
145 static void start_filelist_progress(char *kind)
146 {
147         rprintf(FCLIENT, "%s ... ", kind);
148         if (verbose > 1 || do_progress)
149                 rprintf(FCLIENT, "\n");
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 (do_progress && 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 (do_progress) {
167                 /* This overwrites the progress line */
168                 rprintf(FINFO, "%d file%sto consider\n",
169                         flist->used, flist->used == 1 ? " " : "s ");
170         } else
171                 rprintf(FINFO, "done\n");
172 }
173
174 void show_flist_stats(void)
175 {
176         /* Nothing yet */
177 }
178
179 /* Stat either a symlink or its referent, depending on the settings of
180  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
181  *
182  * If path is the name of a symlink, then the linkbuf buffer (which must hold
183  * MAXPATHLEN chars) will be set to the symlink's target string.
184  *
185  * The stat structure pointed to by stp will contain information about the
186  * link or the referent as appropriate, if they exist. */
187 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
188 {
189 #ifdef SUPPORT_LINKS
190         if (link_stat(path, stp, copy_dirlinks) < 0)
191                 return -1;
192         if (S_ISLNK(stp->st_mode)) {
193                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
194                 if (llen < 0)
195                         return -1;
196                 linkbuf[llen] = '\0';
197                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
198                         if (verbose > 1) {
199                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
200                                         path, linkbuf);
201                         }
202                         return x_stat(path, stp, NULL);
203                 }
204                 if (munge_symlinks && am_sender && llen > SYMLINK_PREFIX_LEN
205                  && strncmp(linkbuf, SYMLINK_PREFIX, SYMLINK_PREFIX_LEN) == 0) {
206                         memmove(linkbuf, linkbuf + SYMLINK_PREFIX_LEN,
207                                 llen - SYMLINK_PREFIX_LEN + 1);
208                 }
209         }
210         return 0;
211 #else
212         return x_stat(path, stp, NULL);
213 #endif
214 }
215
216 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
217 {
218 #ifdef SUPPORT_LINKS
219         if (copy_links)
220                 return x_stat(path, stp, NULL);
221         if (x_lstat(path, stp, NULL) < 0)
222                 return -1;
223         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
224                 STRUCT_STAT st;
225                 if (x_stat(path, &st, NULL) == 0 && S_ISDIR(st.st_mode))
226                         *stp = st;
227         }
228         return 0;
229 #else
230         return x_stat(path, stp, NULL);
231 #endif
232 }
233
234 static inline int is_daemon_excluded(const char *fname, int is_dir)
235 {
236         if (daemon_filter_list.head
237          && check_filter(&daemon_filter_list, FLOG, fname, is_dir) < 0) {
238                 errno = ENOENT;
239                 return 1;
240         }
241         return 0;
242 }
243
244 static inline int path_is_daemon_excluded(char *path, int ignore_filename)
245 {
246         if (daemon_filter_list.head) {
247                 char *slash = path;
248
249                 while ((slash = strchr(slash+1, '/')) != NULL) {
250                         int ret;
251                         *slash = '\0';
252                         ret = check_filter(&daemon_filter_list, FLOG, path, 1);
253                         *slash = '/';
254                         if (ret < 0) {
255                                 errno = ENOENT;
256                                 return 1;
257                         }
258                 }
259
260                 if (!ignore_filename
261                  && check_filter(&daemon_filter_list, FLOG, path, 1) < 0) {
262                         errno = ENOENT;
263                         return 1;
264                 }
265         }
266
267         return 0;
268 }
269
270 /* This function is used to check if a file should be included/excluded
271  * from the list of files based on its name and type etc.  The value of
272  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
273 static int is_excluded(const char *fname, int is_dir, int filter_level)
274 {
275 #if 0 /* This currently never happens, so avoid a useless compare. */
276         if (filter_level == NO_FILTERS)
277                 return 0;
278 #endif
279         if (is_daemon_excluded(fname, is_dir))
280                 return 1;
281         if (filter_level != ALL_FILTERS)
282                 return 0;
283         if (filter_list.head
284             && check_filter(&filter_list, FINFO, fname, is_dir) < 0)
285                 return 1;
286         return 0;
287 }
288
289 static void send_directory(int f, struct file_list *flist,
290                            char *fbuf, int len, int flags);
291
292 static const char *pathname, *orig_dir;
293 static int pathname_len;
294
295 /* Make sure flist can hold at least flist->used + extra entries. */
296 static void flist_expand(struct file_list *flist, int extra)
297 {
298         struct file_struct **new_ptr;
299
300         if (flist->used + extra <= flist->malloced)
301                 return;
302
303         if (flist->malloced < FLIST_START)
304                 flist->malloced = FLIST_START;
305         else if (flist->malloced >= FLIST_LINEAR)
306                 flist->malloced += FLIST_LINEAR;
307         else
308                 flist->malloced *= 2;
309
310         /* In case count jumped or we are starting the list
311          * with a known size just set it. */
312         if (flist->malloced < flist->used + extra)
313                 flist->malloced = flist->used + extra;
314
315         new_ptr = realloc_array(flist->files, struct file_struct *,
316                                 flist->malloced);
317
318         if (verbose >= 2 && flist->malloced != FLIST_START) {
319                 rprintf(FCLIENT, "[%s] expand file_list pointer array to %.0f bytes, did%s move\n",
320                     who_am_i(),
321                     (double)sizeof flist->files[0] * flist->malloced,
322                     (new_ptr == flist->files) ? " not" : "");
323         }
324
325         flist->files = new_ptr;
326
327         if (!flist->files)
328                 out_of_memory("flist_expand");
329 }
330
331 static void flist_done_allocating(struct file_list *flist)
332 {
333         void *ptr = pool_boundary(flist->file_pool, 8*1024);
334         if (flist->pool_boundary == ptr)
335                 flist->pool_boundary = NULL; /* list didn't use any pool memory */
336         else
337                 flist->pool_boundary = ptr;
338 }
339
340 /* Call this with EITHER (1) "file, NULL, 0" to chdir() to the file's
341  * F_PATHNAME(), or (2) "NULL, dir, dirlen" to chdir() to the supplied dir,
342  * with dir == NULL taken to be the starting directory, and dirlen < 0
343  * indicating that strdup(dir) should be called and then the -dirlen length
344  * value checked to ensure that it is not daemon-excluded. */
345 int change_pathname(struct file_struct *file, const char *dir, int dirlen)
346 {
347         if (dirlen < 0) {
348                 char *cpy = strdup(dir);
349                 if (*cpy != '/')
350                         change_dir(orig_dir, CD_SKIP_CHDIR);
351                 if (path_is_daemon_excluded(cpy, 0))
352                         goto chdir_error;
353                 dir = cpy;
354                 dirlen = -dirlen;
355         } else {
356                 if (file) {
357                         if (pathname == F_PATHNAME(file))
358                                 return 1;
359                         dir = F_PATHNAME(file);
360                         if (dir)
361                                 dirlen = strlen(dir);
362                 } else if (pathname == dir)
363                         return 1;
364                 if (dir && *dir != '/')
365                         change_dir(orig_dir, CD_SKIP_CHDIR);
366         }
367
368         pathname = dir;
369         pathname_len = dirlen;
370
371         if (!dir)
372                 dir = orig_dir;
373
374         if (!change_dir(dir, CD_NORMAL)) {
375           chdir_error:
376                 io_error |= IOERR_GENERAL;
377                 rsyserr(FERROR_XFER, errno, "change_dir %s failed", full_fname(dir));
378                 if (dir != orig_dir)
379                         change_dir(orig_dir, CD_NORMAL);
380                 pathname = NULL;
381                 pathname_len = 0;
382                 return 0;
383         }
384
385         return 1;
386 }
387
388 static void send_file_entry(int f, const char *fname, struct file_struct *file,
389 #ifdef SUPPORT_LINKS
390                             const char *symlink_name, int symlink_len,
391 #endif
392                             int ndx, int first_ndx)
393 {
394         static time_t modtime;
395         static mode_t mode;
396 #ifdef SUPPORT_HARD_LINKS
397         static int64 dev;
398 #endif
399         static dev_t rdev;
400         static uint32 rdev_major;
401         static uid_t uid;
402         static gid_t gid;
403         static const char *user_name, *group_name;
404         static char lastname[MAXPATHLEN];
405         int first_hlink_ndx = -1;
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                 if (protocol_version < 28) {
428                         if (tmp_rdev == rdev)
429                                 xflags |= XMIT_SAME_RDEV_pre28;
430                         else
431                                 rdev = tmp_rdev;
432                 } else {
433                         rdev = tmp_rdev;
434                         if ((uint32)major(rdev) == rdev_major)
435                                 xflags |= XMIT_SAME_RDEV_MAJOR;
436                         else
437                                 rdev_major = major(rdev);
438                         if (protocol_version < 30 && (uint32)minor(rdev) <= 0xFFu)
439                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
440                 }
441         } else if (preserve_specials && IS_SPECIAL(mode)) {
442                 /* Special files don't need an rdev number, so just make
443                  * the historical transmission of the value efficient. */
444                 if (protocol_version < 28)
445                         xflags |= XMIT_SAME_RDEV_pre28;
446                 else {
447                         rdev = MAKEDEV(major(rdev), 0);
448                         xflags |= XMIT_SAME_RDEV_MAJOR;
449                         if (protocol_version < 30)
450                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
451                 }
452         } else if (protocol_version < 28)
453                 rdev = MAKEDEV(0, 0);
454         if (!preserve_uid || ((uid_t)F_OWNER(file) == uid && *lastname))
455                 xflags |= XMIT_SAME_UID;
456         else {
457                 uid = F_OWNER(file);
458                 if (!numeric_ids) {
459                         user_name = add_uid(uid);
460                         if (inc_recurse && user_name)
461                                 xflags |= XMIT_USER_NAME_FOLLOWS;
462                 }
463         }
464         if (!preserve_gid || ((gid_t)F_GROUP(file) == gid && *lastname))
465                 xflags |= XMIT_SAME_GID;
466         else {
467                 gid = F_GROUP(file);
468                 if (!numeric_ids) {
469                         group_name = add_gid(gid);
470                         if (inc_recurse && group_name)
471                                 xflags |= XMIT_GROUP_NAME_FOLLOWS;
472                 }
473         }
474         if (file->modtime == modtime)
475                 xflags |= XMIT_SAME_TIME;
476         else
477                 modtime = file->modtime;
478
479 #ifdef SUPPORT_HARD_LINKS
480         if (tmp_dev != -1) {
481                 if (protocol_version >= 30) {
482                         struct ht_int64_node *np = idev_find(tmp_dev, tmp_ino);
483                         first_hlink_ndx = (int32)(long)np->data - 1;
484                         if (first_hlink_ndx < 0) {
485                                 np->data = (void*)(long)(first_ndx + ndx + 1);
486                                 xflags |= XMIT_HLINK_FIRST;
487                         }
488                 } else {
489                         if (tmp_dev == dev) {
490                                 if (protocol_version >= 28)
491                                         xflags |= XMIT_SAME_DEV_pre30;
492                         } else
493                                 dev = tmp_dev;
494                 }
495                 xflags |= XMIT_HLINKED;
496         }
497 #endif
498
499         for (l1 = 0;
500             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
501             l1++) {}
502         l2 = strlen(fname+l1);
503
504         if (l1 > 0)
505                 xflags |= XMIT_SAME_NAME;
506         if (l2 > 255)
507                 xflags |= XMIT_LONG_NAME;
508
509         /* We must make sure we don't send a zero flag byte or the
510          * other end will terminate the flist transfer.  Note that
511          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
512          * it's harmless way to add a bit to the first flag byte. */
513         if (protocol_version >= 28) {
514                 if (!xflags && !S_ISDIR(mode))
515                         xflags |= XMIT_TOP_DIR;
516                 if ((xflags & 0xFF00) || !xflags) {
517                         xflags |= XMIT_EXTENDED_FLAGS;
518                         write_shortint(f, xflags);
519                 } else
520                         write_byte(f, xflags);
521         } else {
522                 if (!(xflags & 0xFF))
523                         xflags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
524                 write_byte(f, xflags);
525         }
526         if (xflags & XMIT_SAME_NAME)
527                 write_byte(f, l1);
528         if (xflags & XMIT_LONG_NAME)
529                 write_varint30(f, l2);
530         else
531                 write_byte(f, l2);
532         write_buf(f, fname + l1, l2);
533
534         if (first_hlink_ndx >= 0) {
535                 write_varint(f, first_hlink_ndx);
536                 if (first_hlink_ndx >= first_ndx)
537                         goto the_end;
538         }
539
540         write_varlong30(f, F_LENGTH(file), 3);
541         if (!(xflags & XMIT_SAME_TIME)) {
542                 if (protocol_version >= 30)
543                         write_varlong(f, modtime, 4);
544                 else
545                         write_int(f, modtime);
546         }
547         if (!(xflags & XMIT_SAME_MODE))
548                 write_int(f, to_wire_mode(mode));
549         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
550                 if (protocol_version < 30)
551                         write_int(f, uid);
552                 else {
553                         write_varint(f, uid);
554                         if (xflags & XMIT_USER_NAME_FOLLOWS) {
555                                 int len = strlen(user_name);
556                                 write_byte(f, len);
557                                 write_buf(f, user_name, len);
558                         }
559                 }
560         }
561         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
562                 if (protocol_version < 30)
563                         write_int(f, gid);
564                 else {
565                         write_varint(f, gid);
566                         if (xflags & XMIT_GROUP_NAME_FOLLOWS) {
567                                 int len = strlen(group_name);
568                                 write_byte(f, len);
569                                 write_buf(f, group_name, len);
570                         }
571                 }
572         }
573         if ((preserve_devices && IS_DEVICE(mode))
574          || (preserve_specials && IS_SPECIAL(mode))) {
575                 if (protocol_version < 28) {
576                         if (!(xflags & XMIT_SAME_RDEV_pre28))
577                                 write_int(f, (int)rdev);
578                 } else {
579                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
580                                 write_varint30(f, major(rdev));
581                         if (protocol_version >= 30)
582                                 write_varint(f, minor(rdev));
583                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
584                                 write_byte(f, minor(rdev));
585                         else
586                                 write_int(f, minor(rdev));
587                 }
588         }
589
590 #ifdef SUPPORT_LINKS
591         if (symlink_len) {
592                 write_varint30(f, symlink_len);
593                 write_buf(f, symlink_name, symlink_len);
594         }
595 #endif
596
597 #ifdef SUPPORT_HARD_LINKS
598         if (tmp_dev != -1 && protocol_version < 30) {
599                 /* Older protocols expect the dev number to be transmitted
600                  * 1-incremented so that it is never zero. */
601                 if (protocol_version < 26) {
602                         /* 32-bit dev_t and ino_t */
603                         write_int(f, (int32)(dev+1));
604                         write_int(f, (int32)tmp_ino);
605                 } else {
606                         /* 64-bit dev_t and ino_t */
607                         if (!(xflags & XMIT_SAME_DEV_pre30))
608                                 write_longint(f, dev+1);
609                         write_longint(f, tmp_ino);
610                 }
611         }
612 #endif
613
614         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
615                 const char *sum;
616                 if (S_ISREG(mode))
617                         sum = tmp_sum;
618                 else {
619                         /* Prior to 28, we sent a useless set of nulls. */
620                         sum = empty_sum;
621                 }
622                 write_buf(f, sum, checksum_len);
623         }
624
625   the_end:
626         strlcpy(lastname, fname, MAXPATHLEN);
627
628         if (S_ISREG(mode) || S_ISLNK(mode))
629                 stats.total_size += F_LENGTH(file);
630 }
631
632 static struct file_struct *recv_file_entry(struct file_list *flist,
633                                            int xflags, int f)
634 {
635         static int64 modtime;
636         static mode_t mode;
637 #ifdef SUPPORT_HARD_LINKS
638         static int64 dev;
639 #endif
640         static dev_t rdev;
641         static uint32 rdev_major;
642         static uid_t uid;
643         static gid_t gid;
644         static uint16 gid_flags;
645         static char lastname[MAXPATHLEN], *lastdir;
646         static int lastdir_depth, lastdir_len = -1;
647         static unsigned int del_hier_name_len = 0;
648         static int in_del_hier = 0;
649         char thisname[MAXPATHLEN];
650         unsigned int l1 = 0, l2 = 0;
651         int alloc_len, basename_len, linkname_len;
652         int extra_len = file_extra_cnt * EXTRA_LEN;
653         int first_hlink_ndx = -1;
654         int64 file_length;
655         const char *basename;
656         struct file_struct *file;
657         alloc_pool_t *pool;
658         char *bp;
659
660         if (xflags & XMIT_SAME_NAME)
661                 l1 = read_byte(f);
662
663         if (xflags & XMIT_LONG_NAME)
664                 l2 = read_varint30(f);
665         else
666                 l2 = read_byte(f);
667
668         if (l2 >= MAXPATHLEN - l1) {
669                 rprintf(FERROR,
670                         "overflow: xflags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
671                         xflags, l1, l2, lastname, who_am_i());
672                 overflow_exit("recv_file_entry");
673         }
674
675         strlcpy(thisname, lastname, l1 + 1);
676         read_sbuf(f, &thisname[l1], l2);
677         thisname[l1 + l2] = 0;
678
679         /* Abuse basename_len for a moment... */
680         basename_len = strlcpy(lastname, thisname, MAXPATHLEN);
681
682 #ifdef ICONV_OPTION
683         if (ic_recv != (iconv_t)-1) {
684                 xbuf outbuf, inbuf;
685
686                 INIT_CONST_XBUF(outbuf, thisname);
687                 INIT_XBUF(inbuf, lastname, basename_len, -1);
688
689                 if (iconvbufs(ic_recv, &inbuf, &outbuf, 0) < 0) {
690                         io_error |= IOERR_GENERAL;
691                         rprintf(FERROR_UTF8,
692                             "[%s] cannot convert filename: %s (%s)\n",
693                             who_am_i(), lastname, strerror(errno));
694                         outbuf.len = 0;
695                 }
696                 thisname[outbuf.len] = '\0';
697         }
698 #endif
699
700         if (*thisname)
701                 clean_fname(thisname, 0);
702
703         if (sanitize_paths)
704                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
705
706         if ((basename = strrchr(thisname, '/')) != NULL) {
707                 int len = basename++ - thisname;
708                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
709                         lastdir = new_array(char, len + 1);
710                         memcpy(lastdir, thisname, len);
711                         lastdir[len] = '\0';
712                         lastdir_len = len;
713                         lastdir_depth = count_dir_elements(lastdir);
714                 }
715         } else
716                 basename = thisname;
717         basename_len = strlen(basename) + 1; /* count the '\0' */
718
719 #ifdef SUPPORT_HARD_LINKS
720         if (protocol_version >= 30
721          && BITS_SETnUNSET(xflags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
722                 first_hlink_ndx = read_varint(f);
723                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->ndx_start + flist->used) {
724                         rprintf(FERROR,
725                                 "hard-link reference out of range: %d (%d)\n",
726                                 first_hlink_ndx, flist->ndx_start + flist->used);
727                         exit_cleanup(RERR_PROTOCOL);
728                 }
729                 if (first_hlink_ndx >= flist->ndx_start) {
730                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
731                         file_length = F_LENGTH(first);
732                         modtime = first->modtime;
733                         mode = first->mode;
734                         if (preserve_uid)
735                                 uid = F_OWNER(first);
736                         if (preserve_gid)
737                                 gid = F_GROUP(first);
738                         if (preserve_devices && IS_DEVICE(mode)) {
739                                 uint32 *devp = F_RDEV_P(first);
740                                 rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
741                                 extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
742                         }
743                         if (preserve_links && S_ISLNK(mode))
744                                 linkname_len = strlen(F_SYMLINK(first)) + 1;
745                         else
746                                 linkname_len = 0;
747                         goto create_object;
748                 }
749         }
750 #endif
751
752         file_length = read_varlong30(f, 3);
753         if (!(xflags & XMIT_SAME_TIME)) {
754                 if (protocol_version >= 30) {
755                         modtime = read_varlong(f, 4);
756 #if SIZEOF_TIME_T < SIZEOF_INT64
757                         if (!am_generator && (int64)(time_t)modtime != modtime) {
758                                 rprintf(FERROR_XFER,
759                                     "Time value of %s truncated on receiver.\n",
760                                     lastname);
761                         }
762 #endif
763                 } else
764                         modtime = read_int(f);
765         }
766         if (!(xflags & XMIT_SAME_MODE))
767                 mode = from_wire_mode(read_int(f));
768
769         if (chmod_modes && !S_ISLNK(mode))
770                 mode = tweak_mode(mode, chmod_modes);
771
772         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
773                 if (protocol_version < 30)
774                         uid = (uid_t)read_int(f);
775                 else {
776                         uid = (uid_t)read_varint(f);
777                         if (xflags & XMIT_USER_NAME_FOLLOWS)
778                                 uid = recv_user_name(f, uid);
779                         else if (inc_recurse && am_root && !numeric_ids)
780                                 uid = match_uid(uid);
781                 }
782         }
783         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
784                 if (protocol_version < 30)
785                         gid = (gid_t)read_int(f);
786                 else {
787                         gid = (gid_t)read_varint(f);
788                         gid_flags = 0;
789                         if (xflags & XMIT_GROUP_NAME_FOLLOWS)
790                                 gid = recv_group_name(f, gid, &gid_flags);
791                         else if (inc_recurse && (!am_root || !numeric_ids))
792                                 gid = match_gid(gid, &gid_flags);
793                 }
794         }
795
796         if ((preserve_devices && IS_DEVICE(mode))
797          || (preserve_specials && IS_SPECIAL(mode))) {
798                 if (protocol_version < 28) {
799                         if (!(xflags & XMIT_SAME_RDEV_pre28))
800                                 rdev = (dev_t)read_int(f);
801                 } else {
802                         uint32 rdev_minor;
803                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
804                                 rdev_major = read_varint30(f);
805                         if (protocol_version >= 30)
806                                 rdev_minor = read_varint(f);
807                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
808                                 rdev_minor = read_byte(f);
809                         else
810                                 rdev_minor = read_int(f);
811                         rdev = MAKEDEV(rdev_major, rdev_minor);
812                 }
813                 if (IS_DEVICE(mode))
814                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
815                 file_length = 0;
816         } else if (protocol_version < 28)
817                 rdev = MAKEDEV(0, 0);
818
819 #ifdef SUPPORT_LINKS
820         if (preserve_links && S_ISLNK(mode)) {
821                 linkname_len = read_varint30(f) + 1; /* count the '\0' */
822                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
823                         rprintf(FERROR, "overflow: linkname_len=%d\n",
824                                 linkname_len - 1);
825                         overflow_exit("recv_file_entry");
826                 }
827 #ifdef ICONV_OPTION
828                 /* We don't know how much extra room we need to convert
829                  * the as-yet-unread symlink data, so let's hope that a
830                  * double-size buffer is plenty. */
831                 if (sender_symlink_iconv)
832                         linkname_len *= 2;
833 #endif
834                 if (munge_symlinks)
835                         linkname_len += SYMLINK_PREFIX_LEN;
836         }
837         else
838 #endif
839                 linkname_len = 0;
840
841 #ifdef SUPPORT_HARD_LINKS
842   create_object:
843         if (preserve_hard_links) {
844                 if (protocol_version < 28 && S_ISREG(mode))
845                         xflags |= XMIT_HLINKED;
846                 if (xflags & XMIT_HLINKED)
847                         extra_len += (inc_recurse+1) * EXTRA_LEN;
848         }
849 #endif
850
851 #ifdef SUPPORT_ACLS
852         /* Directories need an extra int32 for the default ACL. */
853         if (preserve_acls && S_ISDIR(mode))
854                 extra_len += EXTRA_LEN;
855 #endif
856
857         if (always_checksum && S_ISREG(mode))
858                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
859
860 #if SIZEOF_INT64 >= 8
861         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
862                 extra_len += EXTRA_LEN;
863 #endif
864         if (file_length < 0) {
865                 rprintf(FERROR, "Offset underflow: file-length is negative\n");
866                 exit_cleanup(RERR_UNSUPPORTED);
867         }
868
869         if (inc_recurse && S_ISDIR(mode)) {
870                 if (one_file_system) {
871                         /* Room to save the dir's device for -x */
872                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
873                 }
874                 pool = dir_flist->file_pool;
875         } else
876                 pool = flist->file_pool;
877
878 #if EXTRA_ROUNDING > 0
879         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
880                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
881 #endif
882
883         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
884                   + linkname_len;
885         bp = pool_alloc(pool, alloc_len, "recv_file_entry");
886
887         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
888         bp += extra_len;
889         file = (struct file_struct *)bp;
890         bp += FILE_STRUCT_LEN;
891
892         memcpy(bp, basename, basename_len);
893
894 #ifdef SUPPORT_HARD_LINKS
895         if (xflags & XMIT_HLINKED)
896                 file->flags |= FLAG_HLINKED;
897 #endif
898         file->modtime = (time_t)modtime;
899         file->len32 = (uint32)file_length;
900 #if SIZEOF_INT64 >= 8
901         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
902 #if SIZEOF_CAPITAL_OFF_T < 8
903                 rprintf(FERROR, "Offset overflow: attempted 64-bit file-length\n");
904                 exit_cleanup(RERR_UNSUPPORTED);
905 #else
906                 file->flags |= FLAG_LENGTH64;
907                 OPT_EXTRA(file, 0)->unum = (uint32)(file_length >> 32);
908 #endif
909         }
910 #endif
911         file->mode = mode;
912         if (preserve_uid)
913                 F_OWNER(file) = uid;
914         if (preserve_gid) {
915                 F_GROUP(file) = gid;
916                 file->flags |= gid_flags;
917         }
918         if (unsort_ndx)
919                 F_NDX(file) = flist->used + flist->ndx_start;
920
921         if (basename != thisname) {
922                 file->dirname = lastdir;
923                 F_DEPTH(file) = lastdir_depth + 1;
924         } else
925                 F_DEPTH(file) = 1;
926
927         if (S_ISDIR(mode)) {
928                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
929                         F_DEPTH(file)--;
930                 if (protocol_version >= 30) {
931                         if (!(xflags & XMIT_NO_CONTENT_DIR)) {
932                                 if (xflags & XMIT_TOP_DIR)
933                                         file->flags |= FLAG_TOP_DIR;
934                                 file->flags |= FLAG_CONTENT_DIR;
935                         } else if (xflags & XMIT_TOP_DIR)
936                                 file->flags |= FLAG_IMPLIED_DIR;
937                 } else if (xflags & XMIT_TOP_DIR) {
938                         in_del_hier = recurse;
939                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
940                         if (relative_paths && del_hier_name_len > 2
941                             && lastname[del_hier_name_len-1] == '.'
942                             && lastname[del_hier_name_len-2] == '/')
943                                 del_hier_name_len -= 2;
944                         file->flags |= FLAG_TOP_DIR | FLAG_CONTENT_DIR;
945                 } else if (in_del_hier) {
946                         if (!relative_paths || !del_hier_name_len
947                          || (l1 >= del_hier_name_len
948                           && lastname[del_hier_name_len] == '/'))
949                                 file->flags |= FLAG_CONTENT_DIR;
950                         else
951                                 in_del_hier = 0;
952                 }
953         }
954
955         if (preserve_devices && IS_DEVICE(mode)) {
956                 uint32 *devp = F_RDEV_P(file);
957                 DEV_MAJOR(devp) = major(rdev);
958                 DEV_MINOR(devp) = minor(rdev);
959         }
960
961 #ifdef SUPPORT_LINKS
962         if (linkname_len) {
963                 bp += basename_len;
964                 if (first_hlink_ndx >= flist->ndx_start) {
965                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
966                         memcpy(bp, F_SYMLINK(first), linkname_len);
967                 } else {
968                         if (munge_symlinks) {
969                                 strlcpy(bp, SYMLINK_PREFIX, linkname_len);
970                                 bp += SYMLINK_PREFIX_LEN;
971                                 linkname_len -= SYMLINK_PREFIX_LEN;
972                         }
973 #ifdef ICONV_OPTION
974                         if (sender_symlink_iconv) {
975                                 xbuf outbuf, inbuf;
976
977                                 alloc_len = linkname_len;
978                                 linkname_len /= 2;
979
980                                 /* Read the symlink data into the end of our double-sized
981                                  * buffer and then convert it into the right spot. */
982                                 INIT_XBUF(inbuf, bp + alloc_len - linkname_len,
983                                           linkname_len - 1, (size_t)-1);
984                                 read_sbuf(f, inbuf.buf, inbuf.len);
985                                 INIT_XBUF(outbuf, bp, 0, alloc_len);
986
987                                 if (iconvbufs(ic_recv, &inbuf, &outbuf, 0) < 0) {
988                                         io_error |= IOERR_GENERAL;
989                                         rprintf(FERROR_XFER,
990                                             "[%s] cannot convert symlink data for: %s (%s)\n",
991                                             who_am_i(), full_fname(thisname), strerror(errno));
992                                         bp = (char*)file->basename;
993                                         *bp++ = '\0';
994                                         outbuf.len = 0;
995                                 }
996                                 bp[outbuf.len] = '\0';
997                         } else
998 #endif
999                                 read_sbuf(f, bp, linkname_len - 1);
1000                         if (sanitize_paths && !munge_symlinks && *bp)
1001                                 sanitize_path(bp, bp, "", lastdir_depth, SP_DEFAULT);
1002                 }
1003         }
1004 #endif
1005
1006 #ifdef SUPPORT_HARD_LINKS
1007         if (preserve_hard_links && xflags & XMIT_HLINKED) {
1008                 if (protocol_version >= 30) {
1009                         if (xflags & XMIT_HLINK_FIRST) {
1010                                 F_HL_GNUM(file) = flist->ndx_start + flist->used;
1011                         } else
1012                                 F_HL_GNUM(file) = first_hlink_ndx;
1013                 } else {
1014                         static int32 cnt = 0;
1015                         struct ht_int64_node *np;
1016                         int64 ino;
1017                         int32 ndx;
1018                         if (protocol_version < 26) {
1019                                 dev = read_int(f);
1020                                 ino = read_int(f);
1021                         } else {
1022                                 if (!(xflags & XMIT_SAME_DEV_pre30))
1023                                         dev = read_longint(f);
1024                                 ino = read_longint(f);
1025                         }
1026                         np = idev_find(dev, ino);
1027                         ndx = (int32)(long)np->data - 1;
1028                         if (ndx < 0) {
1029                                 ndx = cnt++;
1030                                 np->data = (void*)(long)cnt;
1031                         }
1032                         F_HL_GNUM(file) = ndx;
1033                 }
1034         }
1035 #endif
1036
1037         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
1038                 if (S_ISREG(mode))
1039                         bp = F_SUM(file);
1040                 else {
1041                         /* Prior to 28, we get a useless set of nulls. */
1042                         bp = tmp_sum;
1043                 }
1044                 if (first_hlink_ndx >= flist->ndx_start) {
1045                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
1046                         memcpy(bp, F_SUM(first), checksum_len);
1047                 } else
1048                         read_buf(f, bp, checksum_len);
1049         }
1050
1051 #ifdef SUPPORT_ACLS
1052         if (preserve_acls && !S_ISLNK(mode))
1053                 receive_acl(file, f);
1054 #endif
1055 #ifdef SUPPORT_XATTRS
1056         if (preserve_xattrs)
1057                 receive_xattr(file, f );
1058 #endif
1059
1060         if (S_ISREG(mode) || S_ISLNK(mode))
1061                 stats.total_size += file_length;
1062
1063         return file;
1064 }
1065
1066 /* Create a file_struct for a named file by reading its stat() information
1067  * and performing extensive checks against global options.
1068  *
1069  * Returns a pointer to the new file struct, or NULL if there was an error
1070  * or this file should be excluded.
1071  *
1072  * Note: Any error (here or in send_file_name) that results in the omission of
1073  * an existent source file from the file list should set
1074  * "io_error |= IOERR_GENERAL" to avoid deletion of the file from the
1075  * destination if --delete is on. */
1076 struct file_struct *make_file(const char *fname, struct file_list *flist,
1077                               STRUCT_STAT *stp, int flags, int filter_level)
1078 {
1079         static char *lastdir;
1080         static int lastdir_len = -1;
1081         struct file_struct *file;
1082         char thisname[MAXPATHLEN];
1083         char linkname[MAXPATHLEN];
1084         int alloc_len, basename_len, linkname_len;
1085         int extra_len = file_extra_cnt * EXTRA_LEN;
1086         const char *basename;
1087         alloc_pool_t *pool;
1088         STRUCT_STAT st;
1089         char *bp;
1090
1091         if (strlcpy(thisname, fname, sizeof thisname) >= sizeof thisname) {
1092                 io_error |= IOERR_GENERAL;
1093                 rprintf(FERROR_XFER, "skipping overly long name: %s\n", fname);
1094                 return NULL;
1095         }
1096         clean_fname(thisname, 0);
1097         if (sanitize_paths)
1098                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
1099
1100         if (stp && S_ISDIR(stp->st_mode)) {
1101                 st = *stp; /* Needed for "symlink/." with --relative. */
1102                 *linkname = '\0'; /* make IBM code checker happy */
1103         } else if (readlink_stat(thisname, &st, linkname) != 0) {
1104                 int save_errno = errno;
1105                 /* See if file is excluded before reporting an error. */
1106                 if (filter_level != NO_FILTERS
1107                  && (is_excluded(thisname, 0, filter_level)
1108                   || is_excluded(thisname, 1, filter_level))) {
1109                         if (ignore_perishable && save_errno != ENOENT)
1110                                 non_perishable_cnt++;
1111                         return NULL;
1112                 }
1113                 if (save_errno == ENOENT) {
1114 #ifdef SUPPORT_LINKS
1115                         /* When our options tell us to follow a symlink that
1116                          * points nowhere, tell the user about the symlink
1117                          * instead of giving a "vanished" message.  We only
1118                          * dereference a symlink if one of the --copy*links
1119                          * options was specified, so there's no need for the
1120                          * extra lstat() if one of these options isn't on. */
1121                         if ((copy_links || copy_unsafe_links || copy_dirlinks)
1122                          && x_lstat(thisname, &st, NULL) == 0
1123                          && S_ISLNK(st.st_mode)) {
1124                                 io_error |= IOERR_GENERAL;
1125                                 rprintf(FERROR_XFER, "symlink has no referent: %s\n",
1126                                         full_fname(thisname));
1127                         } else
1128 #endif
1129                         {
1130                                 enum logcode c = am_daemon && protocol_version < 28
1131                                                ? FERROR : FWARNING;
1132                                 io_error |= IOERR_VANISHED;
1133                                 rprintf(c, "file has vanished: %s\n",
1134                                         full_fname(thisname));
1135                         }
1136                 } else {
1137                         io_error |= IOERR_GENERAL;
1138                         rsyserr(FERROR_XFER, save_errno, "readlink_stat(%s) failed",
1139                                 full_fname(thisname));
1140                 }
1141                 return NULL;
1142         }
1143
1144         if (filter_level == NO_FILTERS)
1145                 goto skip_filters;
1146
1147         if (S_ISDIR(st.st_mode)) {
1148                 if (!xfer_dirs) {
1149                         rprintf(FINFO, "skipping directory %s\n", thisname);
1150                         return NULL;
1151                 }
1152                 /* -x only affects dirs because we need to avoid recursing
1153                  * into a mount-point directory, not to avoid copying a
1154                  * symlinked file if -L (or similar) was specified. */
1155                 if (one_file_system && st.st_dev != filesystem_dev
1156                  && BITS_SETnUNSET(flags, FLAG_CONTENT_DIR, FLAG_TOP_DIR)) {
1157                         if (one_file_system > 1) {
1158                                 if (verbose > 1) {
1159                                         rprintf(FINFO,
1160                                             "[%s] skipping mount-point dir %s\n",
1161                                             who_am_i(), thisname);
1162                                 }
1163                                 return NULL;
1164                         }
1165                         flags |= FLAG_MOUNT_DIR;
1166                         flags &= ~FLAG_CONTENT_DIR;
1167                 }
1168         } else
1169                 flags &= ~FLAG_CONTENT_DIR;
1170
1171         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
1172                 if (ignore_perishable)
1173                         non_perishable_cnt++;
1174                 return NULL;
1175         }
1176
1177         if (lp_ignore_nonreadable(module_id)) {
1178 #ifdef SUPPORT_LINKS
1179                 if (!S_ISLNK(st.st_mode))
1180 #endif
1181                         if (access(thisname, R_OK) != 0)
1182                                 return NULL;
1183         }
1184
1185   skip_filters:
1186
1187         /* Only divert a directory in the main transfer. */
1188         if (flist) {
1189                 if (flist->prev && S_ISDIR(st.st_mode)
1190                  && flags & FLAG_DIVERT_DIRS) {
1191                         /* Room for parent/sibling/next-child info. */
1192                         extra_len += DIRNODE_EXTRA_CNT * EXTRA_LEN;
1193                         if (relative_paths)
1194                                 extra_len += PTR_EXTRA_CNT * EXTRA_LEN;
1195                         pool = dir_flist->file_pool;
1196                 } else
1197                         pool = flist->file_pool;
1198         } else {
1199 #ifdef SUPPORT_ACLS
1200                 /* Directories need an extra int32 for the default ACL. */
1201                 if (preserve_acls && S_ISDIR(st.st_mode))
1202                         extra_len += EXTRA_LEN;
1203 #endif
1204                 pool = NULL;
1205         }
1206
1207         if (verbose > 2) {
1208                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1209                         who_am_i(), thisname, filter_level);
1210         }
1211
1212         if ((basename = strrchr(thisname, '/')) != NULL) {
1213                 int len = basename++ - thisname;
1214                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1215                         lastdir = new_array(char, len + 1);
1216                         memcpy(lastdir, thisname, len);
1217                         lastdir[len] = '\0';
1218                         lastdir_len = len;
1219                 }
1220         } else
1221                 basename = thisname;
1222         basename_len = strlen(basename) + 1; /* count the '\0' */
1223
1224 #ifdef SUPPORT_LINKS
1225         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1226 #else
1227         linkname_len = 0;
1228 #endif
1229
1230         if (!uid_ndx && flags & FLAG_DEL_NEEDS_UID)
1231                 extra_len += EXTRA_LEN;
1232
1233 #if SIZEOF_CAPITAL_OFF_T >= 8
1234         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1235                 extra_len += EXTRA_LEN;
1236 #endif
1237
1238 #if EXTRA_ROUNDING > 0
1239         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1240                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1241 #endif
1242
1243         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1244                   + linkname_len;
1245         if (pool)
1246                 bp = pool_alloc(pool, alloc_len, "make_file");
1247         else {
1248                 if (!(bp = new_array(char, alloc_len)))
1249                         out_of_memory("make_file");
1250         }
1251
1252         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1253         bp += extra_len;
1254         file = (struct file_struct *)bp;
1255         bp += FILE_STRUCT_LEN;
1256
1257         memcpy(bp, basename, basename_len);
1258
1259 #ifdef SUPPORT_HARD_LINKS
1260         if (preserve_hard_links && flist && flist->prev) {
1261                 if (protocol_version >= 28
1262                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1263                  : S_ISREG(st.st_mode)) {
1264                         tmp_dev = (int64)st.st_dev;
1265                         tmp_ino = (int64)st.st_ino;
1266                 } else
1267                         tmp_dev = -1;
1268         }
1269 #endif
1270
1271 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1272         if (IS_DEVICE(st.st_mode)) {
1273                 tmp_rdev = st.st_rdev;
1274                 st.st_size = 0;
1275         } else if (IS_SPECIAL(st.st_mode))
1276                 st.st_size = 0;
1277 #endif
1278
1279         file->flags = flags;
1280         file->modtime = st.st_mtime;
1281         file->len32 = (uint32)st.st_size;
1282 #if SIZEOF_CAPITAL_OFF_T >= 8
1283         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1284                 file->flags |= FLAG_LENGTH64;
1285                 OPT_EXTRA(file, 0)->unum = (uint32)(st.st_size >> 32);
1286         }
1287 #endif
1288         file->mode = st.st_mode;
1289         if (uid_ndx) /* Check uid_ndx instead of preserve_uid for del support */
1290                 F_OWNER(file) = st.st_uid;
1291         else if (flags & FLAG_DEL_NEEDS_UID)
1292                 F_DEL_OWNER(file) = st.st_uid;
1293         if (gid_ndx) /* Check gid_ndx instead of preserve_gid for del support */
1294                 F_GROUP(file) = st.st_gid;
1295
1296         if (basename != thisname)
1297                 file->dirname = lastdir;
1298
1299 #ifdef SUPPORT_LINKS
1300         if (linkname_len)
1301                 memcpy(bp + basename_len, linkname, linkname_len);
1302 #endif
1303
1304         if (always_checksum && am_sender && S_ISREG(st.st_mode))
1305                 file_checksum(thisname, tmp_sum, st.st_size);
1306
1307         if (am_sender)
1308                 F_PATHNAME(file) = pathname;
1309         else if (!pool)
1310                 F_DEPTH(file) = extra_len / EXTRA_LEN;
1311
1312         if (basename_len == 0+1) {
1313                 if (!pool)
1314                         unmake_file(file);
1315                 return NULL;
1316         }
1317
1318         if (unsort_ndx)
1319                 F_NDX(file) = dir_count;
1320
1321         return file;
1322 }
1323
1324 /* Only called for temporary file_struct entries created by make_file(). */
1325 void unmake_file(struct file_struct *file)
1326 {
1327         free(REQ_EXTRA(file, F_DEPTH(file)));
1328 }
1329
1330 static struct file_struct *send_file_name(int f, struct file_list *flist,
1331                                           const char *fname, STRUCT_STAT *stp,
1332                                           int flags, int filter_level)
1333 {
1334         struct file_struct *file;
1335
1336         file = make_file(fname, flist, stp, flags, filter_level);
1337         if (!file)
1338                 return NULL;
1339
1340         if (chmod_modes && !S_ISLNK(file->mode))
1341                 file->mode = tweak_mode(file->mode, chmod_modes);
1342
1343         if (f >= 0) {
1344                 char fbuf[MAXPATHLEN];
1345 #ifdef SUPPORT_LINKS
1346                 const char *symlink_name;
1347                 int symlink_len;
1348 #ifdef ICONV_OPTION
1349                 char symlink_buf[MAXPATHLEN];
1350 #endif
1351 #endif
1352 #if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
1353                 stat_x sx;
1354 #endif
1355
1356 #ifdef SUPPORT_LINKS
1357                 if (preserve_links && S_ISLNK(file->mode)) {
1358                         symlink_name = F_SYMLINK(file);
1359                         symlink_len = strlen(symlink_name);
1360                         if (symlink_len == 0) {
1361                                 io_error |= IOERR_GENERAL;
1362                                 f_name(file, fbuf);
1363                                 rprintf(FERROR_XFER,
1364                                     "skipping symlink with 0-length value: %s\n",
1365                                     full_fname(fbuf));
1366                                 return NULL;
1367                         }
1368                 } else {
1369                         symlink_name = NULL;
1370                         symlink_len = 0;
1371                 }
1372 #endif
1373
1374 #ifdef ICONV_OPTION
1375                 if (ic_send != (iconv_t)-1) {
1376                         xbuf outbuf, inbuf;
1377
1378                         INIT_CONST_XBUF(outbuf, fbuf);
1379
1380                         if (file->dirname) {
1381                                 INIT_XBUF_STRLEN(inbuf, (char*)file->dirname);
1382                                 outbuf.size -= 2; /* Reserve room for '/' & 1 more char. */
1383                                 if (iconvbufs(ic_send, &inbuf, &outbuf, 0) < 0)
1384                                         goto convert_error;
1385                                 outbuf.size += 2;
1386                                 fbuf[outbuf.len++] = '/';
1387                         }
1388
1389                         INIT_XBUF_STRLEN(inbuf, (char*)file->basename);
1390                         if (iconvbufs(ic_send, &inbuf, &outbuf, 0) < 0) {
1391                           convert_error:
1392                                 io_error |= IOERR_GENERAL;
1393                                 rprintf(FERROR_XFER,
1394                                     "[%s] cannot convert filename: %s (%s)\n",
1395                                     who_am_i(), f_name(file, fbuf), strerror(errno));
1396                                 return NULL;
1397                         }
1398                         fbuf[outbuf.len] = '\0';
1399
1400 #ifdef SUPPORT_LINKS
1401                         if (symlink_len && sender_symlink_iconv) {
1402                                 INIT_XBUF(inbuf, (char*)symlink_name, symlink_len, (size_t)-1);
1403                                 INIT_CONST_XBUF(outbuf, symlink_buf);
1404                                 if (iconvbufs(ic_send, &inbuf, &outbuf, 0) < 0) {
1405                                         io_error |= IOERR_GENERAL;
1406                                         f_name(file, fbuf);
1407                                         rprintf(FERROR_XFER,
1408                                             "[%s] cannot convert symlink data for: %s (%s)\n",
1409                                             who_am_i(), full_fname(fbuf), strerror(errno));
1410                                         return NULL;
1411                                 }
1412                                 symlink_buf[outbuf.len] = '\0';
1413
1414                                 symlink_name = symlink_buf;
1415                                 symlink_len = outbuf.len;
1416                         }
1417 #endif
1418                 } else
1419 #endif
1420                         f_name(file, fbuf);
1421
1422 #ifdef SUPPORT_ACLS
1423                 if (preserve_acls && !S_ISLNK(file->mode)) {
1424                         sx.st.st_mode = file->mode;
1425                         sx.acc_acl = sx.def_acl = NULL;
1426                         if (get_acl(fname, &sx) < 0) {
1427                                 io_error |= IOERR_GENERAL;
1428                                 return NULL;
1429                         }
1430                 }
1431 #endif
1432 #ifdef SUPPORT_XATTRS
1433                 if (preserve_xattrs) {
1434                         sx.st.st_mode = file->mode;
1435                         sx.xattr = NULL;
1436                         if (get_xattr(fname, &sx) < 0) {
1437                                 io_error |= IOERR_GENERAL;
1438                                 return NULL;
1439                         }
1440                 }
1441 #endif
1442
1443                 send_file_entry(f, fbuf, file,
1444 #ifdef SUPPORT_LINKS
1445                                 symlink_name, symlink_len,
1446 #endif
1447                                 flist->used, flist->ndx_start);
1448
1449 #ifdef SUPPORT_ACLS
1450                 if (preserve_acls && !S_ISLNK(file->mode)) {
1451                         send_acl(&sx, f);
1452                         free_acl(&sx);
1453                 }
1454 #endif
1455 #ifdef SUPPORT_XATTRS
1456                 if (preserve_xattrs) {
1457                         F_XATTR(file) = send_xattr(&sx, f);
1458                         free_xattr(&sx);
1459                 }
1460 #endif
1461         }
1462
1463         maybe_emit_filelist_progress(flist->used + flist_count_offset);
1464
1465         flist_expand(flist, 1);
1466         flist->files[flist->used++] = file;
1467
1468         return file;
1469 }
1470
1471 static void send_if_directory(int f, struct file_list *flist,
1472                               struct file_struct *file,
1473                               char *fbuf, unsigned int ol,
1474                               int flags)
1475 {
1476         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1477
1478         if (S_ISDIR(file->mode)
1479             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1480                 void *save_filters;
1481                 unsigned int len = strlen(fbuf);
1482                 if (len > 1 && fbuf[len-1] == '/')
1483                         fbuf[--len] = '\0';
1484                 save_filters = push_local_filters(fbuf, len);
1485                 send_directory(f, flist, fbuf, len, flags);
1486                 pop_local_filters(save_filters);
1487                 fbuf[ol] = '\0';
1488                 if (is_dot_dir)
1489                         fbuf[ol-1] = '.';
1490         }
1491 }
1492
1493 static int file_compare(const void *file1, const void *file2)
1494 {
1495         return f_name_cmp(*(struct file_struct **)file1,
1496                           *(struct file_struct **)file2);
1497 }
1498
1499 /* The guts of a merge-sort algorithm.  This was derived from the glibc
1500  * version, but I (Wayne) changed the merge code to do less copying and
1501  * to require only half the amount of temporary memory. */
1502 static void fsort_tmp(struct file_struct **fp, size_t num,
1503                       struct file_struct **tmp)
1504 {
1505         struct file_struct **f1, **f2, **t;
1506         size_t n1, n2;
1507
1508         n1 = num / 2;
1509         n2 = num - n1;
1510         f1 = fp;
1511         f2 = fp + n1;
1512
1513         if (n1 > 1)
1514                 fsort_tmp(f1, n1, tmp);
1515         if (n2 > 1)
1516                 fsort_tmp(f2, n2, tmp);
1517
1518         while (f_name_cmp(*f1, *f2) <= 0) {
1519                 if (!--n1)
1520                         return;
1521                 f1++;
1522         }
1523
1524         t = tmp;
1525         memcpy(t, f1, n1 * PTR_SIZE);
1526
1527         *f1++ = *f2++, n2--;
1528
1529         while (n1 > 0 && n2 > 0) {
1530                 if (f_name_cmp(*t, *f2) <= 0)
1531                         *f1++ = *t++, n1--;
1532                 else
1533                         *f1++ = *f2++, n2--;
1534         }
1535
1536         if (n1 > 0)
1537                 memcpy(f1, t, n1 * PTR_SIZE);
1538 }
1539
1540 /* This file-struct sorting routine makes sure that any identical names in
1541  * the file list stay in the same order as they were in the original list.
1542  * This is particularly vital in inc_recurse mode where we expect a sort
1543  * on the flist to match the exact order of a sort on the dir_flist. */
1544 static void fsort(struct file_struct **fp, size_t num)
1545 {
1546         if (num <= 1)
1547                 return;
1548
1549         if (use_qsort)
1550                 qsort(fp, num, PTR_SIZE, file_compare);
1551         else {
1552                 struct file_struct **tmp = new_array(struct file_struct *,
1553                                                      (num+1) / 2);
1554                 fsort_tmp(fp, num, tmp);
1555                 free(tmp);
1556         }
1557 }
1558
1559 /* We take an entire set of sibling dirs from the sorted flist and link them
1560  * into the tree, setting the appropriate parent/child/sibling pointers. */
1561 static void add_dirs_to_tree(int parent_ndx, struct file_list *from_flist,
1562                              int dir_cnt)
1563 {
1564         int i;
1565         int32 *dp = NULL;
1566         int32 *parent_dp = parent_ndx < 0 ? NULL
1567                          : F_DIR_NODE_P(dir_flist->sorted[parent_ndx]);
1568
1569         flist_expand(dir_flist, dir_cnt);
1570         dir_flist->sorted = dir_flist->files;
1571
1572         for (i = 0; dir_cnt; i++) {
1573                 struct file_struct *file = from_flist->sorted[i];
1574
1575                 if (!S_ISDIR(file->mode))
1576                         continue;
1577
1578                 dir_flist->files[dir_flist->used++] = file;
1579                 dir_cnt--;
1580
1581                 if (file->basename[0] == '.' && file->basename[1] == '\0')
1582                         continue;
1583
1584                 if (dp)
1585                         DIR_NEXT_SIBLING(dp) = dir_flist->used - 1;
1586                 else if (parent_dp)
1587                         DIR_FIRST_CHILD(parent_dp) = dir_flist->used - 1;
1588                 else
1589                         send_dir_ndx = dir_flist->used - 1;
1590
1591                 dp = F_DIR_NODE_P(file);
1592                 DIR_PARENT(dp) = parent_ndx;
1593                 DIR_FIRST_CHILD(dp) = -1;
1594         }
1595         if (dp)
1596                 DIR_NEXT_SIBLING(dp) = -1;
1597 }
1598
1599 static void interpret_stat_error(const char *fname, int is_dir)
1600 {
1601         if (errno == ENOENT) {
1602                 io_error |= IOERR_VANISHED;
1603                 rprintf(FWARNING, "%s has vanished: %s\n",
1604                         is_dir ? "directory" : "file", full_fname(fname));
1605         } else {
1606                 io_error |= IOERR_GENERAL;
1607                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
1608                         full_fname(fname));
1609         }
1610 }
1611
1612 /* This function is normally called by the sender, but the receiving side also
1613  * calls it from get_dirlist() with f set to -1 so that we just construct the
1614  * file list in memory without sending it over the wire.  Also, get_dirlist()
1615  * might call this with f set to -2, which also indicates that local filter
1616  * rules should be ignored. */
1617 static void send_directory(int f, struct file_list *flist, char *fbuf, int len,
1618                            int flags)
1619 {
1620         struct dirent *di;
1621         unsigned remainder;
1622         char *p;
1623         DIR *d;
1624         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1625         int start = flist->used;
1626         int filter_level = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1627
1628         assert(flist != NULL);
1629
1630         if (!(d = opendir(fbuf))) {
1631                 if (errno == ENOENT) {
1632                         if (am_sender) /* Can abuse this for vanished error w/ENOENT: */
1633                                 interpret_stat_error(fbuf, True);
1634                         return;
1635                 }
1636                 io_error |= IOERR_GENERAL;
1637                 rsyserr(FERROR_XFER, errno, "opendir %s failed", full_fname(fbuf));
1638                 return;
1639         }
1640
1641         p = fbuf + len;
1642         if (len == 1 && *fbuf == '/')
1643                 remainder = MAXPATHLEN - 1;
1644         else if (len < MAXPATHLEN-1) {
1645                 *p++ = '/';
1646                 *p = '\0';
1647                 remainder = MAXPATHLEN - (len + 1);
1648         } else
1649                 remainder = 0;
1650
1651         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1652                 char *dname = d_name(di);
1653                 if (dname[0] == '.' && (dname[1] == '\0'
1654                     || (dname[1] == '.' && dname[2] == '\0')))
1655                         continue;
1656                 unsigned name_len = strlcpy(p, dname, remainder);
1657                 if (name_len >= remainder) {
1658                         char save = fbuf[len];
1659                         fbuf[len] = '\0';
1660                         io_error |= IOERR_GENERAL;
1661                         rprintf(FERROR_XFER,
1662                                 "filename overflows max-path len by %u: %s/%s\n",
1663                                 name_len - remainder + 1, fbuf, dname);
1664                         fbuf[len] = save;
1665                         continue;
1666                 }
1667                 if (dname[0] == '\0') {
1668                         io_error |= IOERR_GENERAL;
1669                         rprintf(FERROR_XFER,
1670                                 "cannot send file with empty name in %s\n",
1671                                 full_fname(fbuf));
1672                         continue;
1673                 }
1674
1675                 send_file_name(f, flist, fbuf, NULL, flags, filter_level);
1676         }
1677
1678         fbuf[len] = '\0';
1679
1680         if (errno) {
1681                 io_error |= IOERR_GENERAL;
1682                 rsyserr(FERROR_XFER, errno, "readdir(%s)", full_fname(fbuf));
1683         }
1684
1685         closedir(d);
1686
1687         if (f >= 0 && recurse && !divert_dirs) {
1688                 int i, end = flist->used - 1;
1689                 /* send_if_directory() bumps flist->used, so use "end". */
1690                 for (i = start; i <= end; i++)
1691                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1692         }
1693 }
1694
1695 static void send_implied_dirs(int f, struct file_list *flist, char *fname,
1696                               char *start, char *limit, int flags, char name_type)
1697 {
1698         static char lastpath[MAXPATHLEN] = "";
1699         static int lastpath_len = 0;
1700         static struct file_struct *lastpath_struct = NULL;
1701         struct file_struct *file;
1702         item_list *relname_list;
1703         relnamecache **rnpp;
1704         int len, need_new_dir, depth = 0;
1705         struct filter_list_struct save_filter_list = filter_list;
1706
1707         flags = (flags | FLAG_IMPLIED_DIR) & ~(FLAG_TOP_DIR | FLAG_CONTENT_DIR);
1708         filter_list.head = filter_list.tail = NULL; /* Don't filter implied dirs. */
1709
1710         if (inc_recurse) {
1711                 if (lastpath_struct && F_PATHNAME(lastpath_struct) == pathname
1712                  && lastpath_len == limit - fname
1713                  && strncmp(lastpath, fname, lastpath_len) == 0)
1714                         need_new_dir = 0;
1715                 else
1716                         need_new_dir = 1;
1717         } else {
1718                 char *tp = fname, *lp = lastpath;
1719                 /* Skip any initial directories in our path that we
1720                  * have in common with lastpath. */
1721                 assert(start == fname);
1722                 for ( ; ; tp++, lp++) {
1723                         if (tp == limit) {
1724                                 if (*lp == '/' || *lp == '\0')
1725                                         goto done;
1726                                 break;
1727                         }
1728                         if (*lp != *tp)
1729                                 break;
1730                         if (*tp == '/') {
1731                                 start = tp;
1732                                 depth++;
1733                         }
1734                 }
1735                 need_new_dir = 1;
1736         }
1737
1738         if (need_new_dir) {
1739                 int save_copy_links = copy_links;
1740                 int save_xfer_dirs = xfer_dirs;
1741                 char *slash;
1742
1743                 copy_links = xfer_dirs = 1;
1744
1745                 *limit = '\0';
1746
1747                 for (slash = start; (slash = strchr(slash+1, '/')) != NULL; ) {
1748                         *slash = '\0';
1749                         file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1750                         depth++;
1751                         if (!inc_recurse && file && S_ISDIR(file->mode))
1752                                 change_local_filter_dir(fname, strlen(fname), depth);
1753                         *slash = '/';
1754                 }
1755
1756                 file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1757                 if (inc_recurse) {
1758                         if (file && !S_ISDIR(file->mode))
1759                                 file = NULL;
1760                         lastpath_struct = file;
1761                 } else if (file && S_ISDIR(file->mode))
1762                         change_local_filter_dir(fname, strlen(fname), ++depth);
1763
1764                 strlcpy(lastpath, fname, sizeof lastpath);
1765                 lastpath_len = limit - fname;
1766
1767                 *limit = '/';
1768
1769                 copy_links = save_copy_links;
1770                 xfer_dirs = save_xfer_dirs;
1771
1772                 if (!inc_recurse)
1773                         goto done;
1774         }
1775
1776         if (!lastpath_struct)
1777                 goto done; /* dir must have vanished */
1778
1779         len = strlen(limit+1);
1780         memcpy(&relname_list, F_DIR_RELNAMES_P(lastpath_struct), sizeof relname_list);
1781         if (!relname_list) {
1782                 if (!(relname_list = new0(item_list)))
1783                         out_of_memory("send_implied_dirs");
1784                 memcpy(F_DIR_RELNAMES_P(lastpath_struct), &relname_list, sizeof relname_list);
1785         }
1786         rnpp = EXPAND_ITEM_LIST(relname_list, relnamecache *, 32);
1787         if (!(*rnpp = (relnamecache*)new_array(char, sizeof (relnamecache) + len)))
1788                 out_of_memory("send_implied_dirs");
1789         (*rnpp)->name_type = name_type;
1790         strlcpy((*rnpp)->fname, limit+1, len + 1);
1791
1792 done:
1793         filter_list = save_filter_list;
1794 }
1795
1796 static NORETURN void fatal_unsafe_io_error(void)
1797 {
1798         /* This (sadly) can only happen when pushing data because
1799          * the sender does not know about what kind of delete
1800          * is in effect on the receiving side when pulling. */
1801         rprintf(FERROR_XFER, "FATAL I/O ERROR: dying to avoid a --delete-during issue with a pre-3.0.7 receiver.\n");
1802         exit_cleanup(RERR_UNSUPPORTED);
1803 }
1804
1805 static void send1extra(int f, struct file_struct *file, struct file_list *flist)
1806 {
1807         char fbuf[MAXPATHLEN];
1808         item_list *relname_list;
1809         int len, dlen, flags = FLAG_DIVERT_DIRS | FLAG_CONTENT_DIR;
1810         size_t j;
1811
1812         f_name(file, fbuf);
1813         dlen = strlen(fbuf);
1814
1815         if (!change_pathname(file, NULL, 0))
1816                 exit_cleanup(RERR_FILESELECT);
1817
1818         change_local_filter_dir(fbuf, dlen, send_dir_depth);
1819
1820         if (file->flags & FLAG_CONTENT_DIR) {
1821                 if (one_file_system) {
1822                         STRUCT_STAT st;
1823                         if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1824                                 interpret_stat_error(fbuf, True);
1825                                 return;
1826                         }
1827                         filesystem_dev = st.st_dev;
1828                 }
1829                 send_directory(f, flist, fbuf, dlen, flags);
1830         }
1831
1832         if (!relative_paths)
1833                 return;
1834
1835         memcpy(&relname_list, F_DIR_RELNAMES_P(file), sizeof relname_list);
1836         if (!relname_list)
1837                 return;
1838
1839         for (j = 0; j < relname_list->count; j++) {
1840                 char *slash;
1841                 relnamecache *rnp = ((relnamecache**)relname_list->items)[j];
1842                 char name_type = rnp->name_type;
1843
1844                 fbuf[dlen] = '/';
1845                 len = strlcpy(fbuf + dlen + 1, rnp->fname, sizeof fbuf - dlen - 1);
1846                 free(rnp);
1847                 if (len >= (int)sizeof fbuf)
1848                         continue; /* Impossible... */
1849
1850                 slash = strchr(fbuf+dlen+1, '/');
1851                 if (slash) {
1852                         send_implied_dirs(f, flist, fbuf, fbuf+dlen+1, slash, flags, name_type);
1853                         continue;
1854                 }
1855
1856                 if (name_type != NORMAL_NAME) {
1857                         STRUCT_STAT st;
1858                         if (link_stat(fbuf, &st, 1) != 0) {
1859                                 interpret_stat_error(fbuf, True);
1860                                 continue;
1861                         }
1862                         send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR | flags, ALL_FILTERS);
1863                 } else
1864                         send_file_name(f, flist, fbuf, NULL, FLAG_TOP_DIR | flags, ALL_FILTERS);
1865         }
1866
1867         free(relname_list);
1868 }
1869
1870 void send_extra_file_list(int f, int at_least)
1871 {
1872         struct file_list *flist;
1873         int64 start_write;
1874         uint16 prev_flags;
1875         int old_cnt, save_io_error = io_error;
1876
1877         if (flist_eof)
1878                 return;
1879
1880         /* Keep sending data until we have the requested number of
1881          * files in the upcoming file-lists. */
1882         old_cnt = cur_flist->used;
1883         for (flist = first_flist; flist != cur_flist; flist = flist->next)
1884                 old_cnt += flist->used;
1885         while (file_total - old_cnt < at_least) {
1886                 struct file_struct *file = dir_flist->sorted[send_dir_ndx];
1887                 int dir_ndx, dstart = dir_count;
1888                 const char *pathname = F_PATHNAME(file);
1889                 int32 *dp;
1890
1891                 flist = flist_new(0, "send_extra_file_list");
1892                 start_write = stats.total_written;
1893
1894                 if (unsort_ndx)
1895                         dir_ndx = F_NDX(file);
1896                 else
1897                         dir_ndx = send_dir_ndx;
1898                 write_ndx(f, NDX_FLIST_OFFSET - dir_ndx);
1899                 flist->parent_ndx = dir_ndx;
1900
1901                 send1extra(f, file, flist);
1902                 prev_flags = file->flags;
1903                 dp = F_DIR_NODE_P(file);
1904
1905                 /* If there are any duplicate directory names that follow, we
1906                  * send all the dirs together in one file-list.  The dir_flist
1907                  * tree links all the child subdirs onto the last dup dir. */
1908                 while ((dir_ndx = DIR_NEXT_SIBLING(dp)) >= 0
1909                     && dir_flist->sorted[dir_ndx]->flags & FLAG_DUPLICATE) {
1910                         send_dir_ndx = dir_ndx;
1911                         file = dir_flist->sorted[dir_ndx];
1912                         /* Try to avoid some duplicate scanning of identical dirs. */
1913                         if (F_PATHNAME(file) == pathname && prev_flags & FLAG_CONTENT_DIR)
1914                                 file->flags &= ~FLAG_CONTENT_DIR;
1915                         send1extra(f, file, flist);
1916                         prev_flags = file->flags;
1917                         dp = F_DIR_NODE_P(file);
1918                 }
1919
1920                 if (io_error == save_io_error || ignore_errors)
1921                         write_byte(f, 0);
1922                 else if (use_safe_inc_flist) {
1923                         write_shortint(f, XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST);
1924                         write_varint(f, io_error);
1925                 } else {
1926                         if (delete_during)
1927                                 fatal_unsafe_io_error();
1928                         write_byte(f, 0);
1929                 }
1930
1931                 if (need_unsorted_flist) {
1932                         if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
1933                                 out_of_memory("send_extra_file_list");
1934                         memcpy(flist->sorted, flist->files,
1935                                flist->used * sizeof (struct file_struct*));
1936                 } else
1937                         flist->sorted = flist->files;
1938
1939                 flist_sort_and_clean(flist, 0);
1940
1941                 add_dirs_to_tree(send_dir_ndx, flist, dir_count - dstart);
1942                 flist_done_allocating(flist);
1943
1944                 file_total += flist->used;
1945                 stats.flist_size += stats.total_written - start_write;
1946                 stats.num_files += flist->used;
1947                 if (verbose > 3)
1948                         output_flist(flist);
1949
1950                 if (DIR_FIRST_CHILD(dp) >= 0) {
1951                         send_dir_ndx = DIR_FIRST_CHILD(dp);
1952                         send_dir_depth++;
1953                 } else {
1954                         while (DIR_NEXT_SIBLING(dp) < 0) {
1955                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
1956                                         write_ndx(f, NDX_FLIST_EOF);
1957                                         flist_eof = 1;
1958                                         change_local_filter_dir(NULL, 0, 0);
1959                                         goto finish;
1960                                 }
1961                                 send_dir_depth--;
1962                                 file = dir_flist->sorted[send_dir_ndx];
1963                                 dp = F_DIR_NODE_P(file);
1964                         }
1965                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
1966                 }
1967         }
1968
1969   finish:
1970         if (io_error != save_io_error && !ignore_errors)
1971                 send_msg_int(MSG_IO_ERROR, io_error);
1972 }
1973
1974 struct file_list *send_file_list(int f, int argc, char *argv[])
1975 {
1976         static const char *lastdir;
1977         static int lastdir_len = -1;
1978         int len, dirlen;
1979         STRUCT_STAT st;
1980         char *p, *dir;
1981         struct file_list *flist;
1982         struct timeval start_tv, end_tv;
1983         int64 start_write;
1984         int use_ff_fd = 0;
1985         int disable_buffering;
1986         int flags = recurse ? FLAG_CONTENT_DIR : 0;
1987         int reading_remotely = filesfrom_host != NULL;
1988         int rl_flags = (reading_remotely ? 0 : RL_DUMP_COMMENTS)
1989 #ifdef ICONV_OPTION
1990                      | (filesfrom_convert ? RL_CONVERT : 0)
1991 #endif
1992                      | (eol_nulls || reading_remotely ? RL_EOL_NULLS : 0);
1993         int implied_dot_dir = 0;
1994
1995         rprintf(FLOG, "building file list\n");
1996         if (show_filelist_p())
1997                 start_filelist_progress("building file list");
1998         else if (inc_recurse && verbose && !am_server)
1999                 rprintf(FCLIENT, "sending incremental file list\n");
2000
2001         start_write = stats.total_written;
2002         gettimeofday(&start_tv, NULL);
2003
2004         if (relative_paths && protocol_version >= 30)
2005                 implied_dirs = 1; /* We send flagged implied dirs */
2006
2007 #ifdef SUPPORT_HARD_LINKS
2008         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
2009                 init_hard_links();
2010 #endif
2011
2012         flist = cur_flist = flist_new(0, "send_file_list");
2013         if (inc_recurse) {
2014                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
2015                 flags |= FLAG_DIVERT_DIRS;
2016         } else
2017                 dir_flist = cur_flist;
2018
2019         disable_buffering = io_start_buffering_out(f);
2020         if (filesfrom_fd >= 0) {
2021                 if (argv[0] && !change_dir(argv[0], CD_NORMAL)) {
2022                         rsyserr(FERROR_XFER, errno, "change_dir %s failed",
2023                                 full_fname(argv[0]));
2024                         exit_cleanup(RERR_FILESELECT);
2025                 }
2026                 use_ff_fd = 1;
2027         }
2028
2029         if (!orig_dir)
2030                 orig_dir = strdup(curr_dir);
2031
2032         while (1) {
2033                 char fbuf[MAXPATHLEN], *fn, name_type;
2034
2035                 if (use_ff_fd) {
2036                         if (read_line(filesfrom_fd, fbuf, sizeof fbuf, rl_flags) == 0)
2037                                 break;
2038                         sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
2039                 } else {
2040                         if (argc-- == 0)
2041                                 break;
2042                         strlcpy(fbuf, *argv++, MAXPATHLEN);
2043                         if (sanitize_paths)
2044                                 sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
2045                 }
2046
2047                 len = strlen(fbuf);
2048                 if (relative_paths) {
2049                         /* We clean up fbuf below. */
2050                         name_type = NORMAL_NAME;
2051                 } else if (!len || fbuf[len - 1] == '/') {
2052                         if (len == 2 && fbuf[0] == '.') {
2053                                 /* Turn "./" into just "." rather than "./." */
2054                                 fbuf[--len] = '\0';
2055                         } else {
2056                                 if (len + 1 >= MAXPATHLEN)
2057                                         overflow_exit("send_file_list");
2058                                 fbuf[len++] = '.';
2059                                 fbuf[len] = '\0';
2060                         }
2061                         name_type = DOTDIR_NAME;
2062                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
2063                     && (len == 2 || fbuf[len-3] == '/')) {
2064                         if (len + 2 >= MAXPATHLEN)
2065                                 overflow_exit("send_file_list");
2066                         fbuf[len++] = '/';
2067                         fbuf[len++] = '.';
2068                         fbuf[len] = '\0';
2069                         name_type = DOTDIR_NAME;
2070                 } else if (fbuf[len-1] == '.' && (len == 1 || fbuf[len-2] == '/'))
2071                         name_type = DOTDIR_NAME;
2072                 else
2073                         name_type = NORMAL_NAME;
2074
2075                 dir = NULL;
2076
2077                 if (!relative_paths) {
2078                         p = strrchr(fbuf, '/');
2079                         if (p) {
2080                                 *p = '\0';
2081                                 if (p == fbuf)
2082                                         dir = "/";
2083                                 else
2084                                         dir = fbuf;
2085                                 len -= p - fbuf + 1;
2086                                 fn = p + 1;
2087                         } else
2088                                 fn = fbuf;
2089                 } else {
2090                         if ((p = strstr(fbuf, "/./")) != NULL) {
2091                                 *p = '\0';
2092                                 if (p == fbuf)
2093                                         dir = "/";
2094                                 else {
2095                                         dir = fbuf;
2096                                         clean_fname(dir, 0);
2097                                 }
2098                                 fn = p + 3;
2099                                 while (*fn == '/')
2100                                         fn++;
2101                                 if (!*fn)
2102                                         *--fn = '\0'; /* ensure room for '.' */
2103                         } else
2104                                 fn = fbuf;
2105                         /* A leading ./ can be used in relative mode to affect
2106                          * the dest dir without its name being in the path. */
2107                         if (*fn == '.' && fn[1] == '/' && !implied_dot_dir) {
2108                                 send_file_name(f, flist, ".", NULL,
2109                                     (flags | FLAG_IMPLIED_DIR) & ~FLAG_CONTENT_DIR,
2110                                     ALL_FILTERS);
2111                                 implied_dot_dir = 1;
2112                         }
2113                         len = clean_fname(fn, CFN_KEEP_TRAILING_SLASH
2114                                             | CFN_DROP_TRAILING_DOT_DIR);
2115                         if (len == 1) {
2116                                 if (fn[0] == '/') {
2117                                         fn = "/.";
2118                                         len = 2;
2119                                         name_type = DOTDIR_NAME;
2120                                 } else if (fn[0] == '.')
2121                                         name_type = DOTDIR_NAME;
2122                         } else if (fn[len-1] == '/') {
2123                                 fn[--len] = '\0';
2124                                 if (len == 1 && *fn == '.')
2125                                         name_type = DOTDIR_NAME;
2126                                 else
2127                                         name_type = SLASH_ENDING_NAME;
2128                         }
2129                         /* Reject a ".." dir in the active part of the path. */
2130                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
2131                                 if ((p[2] == '/' || p[2] == '\0')
2132                                  && (p == fn || p[-1] == '/')) {
2133                                         rprintf(FERROR,
2134                                             "found \"..\" dir in relative path: %s\n",
2135                                             fn);
2136                                         exit_cleanup(RERR_SYNTAX);
2137                                 }
2138                         }
2139                 }
2140
2141                 if (!*fn) {
2142                         len = 1;
2143                         fn = ".";
2144                         name_type = DOTDIR_NAME;
2145                 }
2146
2147                 dirlen = dir ? strlen(dir) : 0;
2148                 if (dirlen != lastdir_len || memcmp(lastdir, dir, dirlen) != 0) {
2149                         if (!change_pathname(NULL, dir, -dirlen))
2150                                 continue;
2151                         lastdir = pathname;
2152                         lastdir_len = pathname_len;
2153                 } else if (!change_pathname(NULL, lastdir, lastdir_len))
2154                         continue;
2155
2156                 if (fn != fbuf)
2157                         memmove(fbuf, fn, len + 1);
2158
2159                 if (link_stat(fbuf, &st, copy_dirlinks || name_type != NORMAL_NAME) != 0
2160                  || (name_type != DOTDIR_NAME && is_daemon_excluded(fbuf, S_ISDIR(st.st_mode)))
2161                  || (relative_paths && path_is_daemon_excluded(fbuf, 1))) {
2162                         io_error |= IOERR_GENERAL;
2163                         rsyserr(FERROR_XFER, errno, "link_stat %s failed",
2164                                 full_fname(fbuf));
2165                         continue;
2166                 }
2167
2168                 /* A dot-dir should not be excluded! */
2169                 if (name_type != DOTDIR_NAME
2170                  && is_excluded(fbuf, S_ISDIR(st.st_mode) != 0, ALL_FILTERS))
2171                         continue;
2172
2173                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
2174                         rprintf(FINFO, "skipping directory %s\n", fbuf);
2175                         continue;
2176                 }
2177
2178                 if (inc_recurse && relative_paths && *fbuf) {
2179                         if ((p = strchr(fbuf+1, '/')) != NULL) {
2180                                 if (p - fbuf == 1 && *fbuf == '.') {
2181                                         if ((fn = strchr(p+1, '/')) != NULL)
2182                                                 p = fn;
2183                                 } else
2184                                         fn = p;
2185                                 send_implied_dirs(f, flist, fbuf, fbuf, p, flags, name_type);
2186                                 if (fn == p)
2187                                         continue;
2188                         }
2189                 } else if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
2190                         /* Send the implied directories at the start of the
2191                          * source spec, so we get their permissions right. */
2192                         send_implied_dirs(f, flist, fbuf, fbuf, p, flags, 0);
2193                 }
2194
2195                 if (one_file_system)
2196                         filesystem_dev = st.st_dev;
2197
2198                 if (recurse || (xfer_dirs && name_type != NORMAL_NAME)) {
2199                         struct file_struct *file;
2200                         file = send_file_name(f, flist, fbuf, &st,
2201                                               FLAG_TOP_DIR | FLAG_CONTENT_DIR | flags,
2202                                               NO_FILTERS);
2203                         if (!file)
2204                                 continue;
2205                         if (inc_recurse) {
2206                                 if (name_type == DOTDIR_NAME) {
2207                                         if (send_dir_depth < 0) {
2208                                                 send_dir_depth = 0;
2209                                                 change_local_filter_dir(fbuf, len, send_dir_depth);
2210                                         }
2211                                         send_directory(f, flist, fbuf, len, flags);
2212                                 }
2213                         } else
2214                                 send_if_directory(f, flist, file, fbuf, len, flags);
2215                 } else
2216                         send_file_name(f, flist, fbuf, &st, flags, NO_FILTERS);
2217         }
2218
2219         gettimeofday(&end_tv, NULL);
2220         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2221                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2222         if (stats.flist_buildtime == 0)
2223                 stats.flist_buildtime = 1;
2224         start_tv = end_tv;
2225
2226         /* Indicate end of file list */
2227         if (io_error == 0 || ignore_errors)
2228                 write_byte(f, 0);
2229         else if (use_safe_inc_flist) {
2230                 write_shortint(f, XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST);
2231                 write_varint(f, io_error);
2232         } else {
2233                 if (delete_during && inc_recurse)
2234                         fatal_unsafe_io_error();
2235                 write_byte(f, 0);
2236         }
2237
2238 #ifdef SUPPORT_HARD_LINKS
2239         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
2240                 idev_destroy();
2241 #endif
2242
2243         if (show_filelist_p())
2244                 finish_filelist_progress(flist);
2245
2246         gettimeofday(&end_tv, NULL);
2247         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2248                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2249
2250         /* When converting names, both sides keep an unsorted file-list array
2251          * because the names will differ on the sending and receiving sides
2252          * (both sides will use the unsorted index number for each item). */
2253
2254         /* Sort the list without removing any duplicates.  This allows the
2255          * receiving side to ask for whatever name it kept.  For incremental
2256          * recursion mode, the sender marks duplicate dirs so that it can
2257          * send them together in a single file-list. */
2258         if (need_unsorted_flist) {
2259                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2260                         out_of_memory("send_file_list");
2261                 memcpy(flist->sorted, flist->files,
2262                        flist->used * sizeof (struct file_struct*));
2263         } else
2264                 flist->sorted = flist->files;
2265         flist_sort_and_clean(flist, 0);
2266         file_total += flist->used;
2267
2268         if (numeric_ids <= 0 && !inc_recurse)
2269                 send_id_list(f);
2270
2271         set_msg_fd_in(-1);
2272
2273         /* send the io_error flag */
2274         if (protocol_version < 30)
2275                 write_int(f, ignore_errors ? 0 : io_error);
2276         else if (!use_safe_inc_flist && io_error && !ignore_errors)
2277                 send_msg_int(MSG_IO_ERROR, io_error);
2278
2279         if (disable_buffering)
2280                 io_end_buffering_out();
2281
2282         stats.flist_size = stats.total_written - start_write;
2283         stats.num_files = flist->used;
2284
2285         if (verbose > 3)
2286                 output_flist(flist);
2287
2288         if (verbose > 2)
2289                 rprintf(FINFO, "send_file_list done\n");
2290
2291         if (inc_recurse) {
2292                 send_dir_depth = 1;
2293                 add_dirs_to_tree(-1, flist, dir_count);
2294                 if (!file_total || strcmp(flist->sorted[flist->low]->basename, ".") != 0)
2295                         flist->parent_ndx = -1;
2296                 flist_done_allocating(flist);
2297                 if (send_dir_ndx < 0) {
2298                         write_ndx(f, NDX_FLIST_EOF);
2299                         flist_eof = 1;
2300                 }
2301                 else if (file_total == 1) {
2302                         /* If we're creating incremental file-lists and there
2303                          * was just 1 item in the first file-list, send 1 more
2304                          * file-list to check if this is a 1-file xfer. */
2305                         send_extra_file_list(f, 1);
2306                 }
2307         }
2308
2309         return flist;
2310 }
2311
2312 struct file_list *recv_file_list(int f)
2313 {
2314         struct file_list *flist;
2315         int dstart, flags;
2316         int64 start_read;
2317         int save_verbose = verbose;
2318
2319         if (!first_flist)
2320                 rprintf(FLOG, "receiving file list\n");
2321         if (show_filelist_p())
2322                 start_filelist_progress("receiving file list");
2323         else if (inc_recurse && verbose && !am_server && !first_flist)
2324                 rprintf(FCLIENT, "receiving incremental file list\n");
2325
2326         start_read = stats.total_read;
2327
2328 #ifdef SUPPORT_HARD_LINKS
2329         if (preserve_hard_links && !first_flist)
2330                 init_hard_links();
2331 #endif
2332
2333         flist = flist_new(0, "recv_file_list");
2334
2335         if (inc_recurse) {
2336                 if (flist->ndx_start == 1)
2337                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
2338                 dstart = dir_flist->used;
2339         } else {
2340                 dir_flist = flist;
2341                 dstart = 0;
2342         }
2343
2344         if (am_server && verbose > 2)
2345                 verbose = 2;
2346         while ((flags = read_byte(f)) != 0) {
2347                 struct file_struct *file;
2348
2349                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
2350                         flags |= read_byte(f) << 8;
2351
2352                 if (flags == (XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST)) {
2353                         int err;
2354                         if (!use_safe_inc_flist) {
2355                                 rprintf(FERROR, "Invalid flist flag: %x\n", flags);
2356                                 exit_cleanup(RERR_PROTOCOL);
2357                         }
2358                         err = read_varint(f);
2359                         if (!ignore_errors)
2360                                 io_error |= err;
2361                         break;
2362                 }
2363
2364                 flist_expand(flist, 1);
2365                 file = recv_file_entry(flist, flags, f);
2366
2367                 if (inc_recurse && S_ISDIR(file->mode)) {
2368                         flist_expand(dir_flist, 1);
2369                         dir_flist->files[dir_flist->used++] = file;
2370                 }
2371
2372                 flist->files[flist->used++] = file;
2373
2374                 maybe_emit_filelist_progress(flist->used);
2375
2376                 if (verbose > 2) {
2377                         char *name = f_name(file, NULL);
2378                         rprintf(FINFO, "recv_file_name(%s)\n", NS(name));
2379                 }
2380         }
2381         file_total += flist->used;
2382         verbose = save_verbose;
2383
2384         if (verbose > 2)
2385                 rprintf(FINFO, "received %d names\n", flist->used);
2386
2387         if (show_filelist_p())
2388                 finish_filelist_progress(flist);
2389
2390         if (need_unsorted_flist) {
2391                 /* Create an extra array of index pointers that we can sort for
2392                  * the generator's use (for wading through the files in sorted
2393                  * order and for calling flist_find()).  We keep the "files"
2394                  * list unsorted for our exchange of index numbers with the
2395                  * other side (since their names may not sort the same). */
2396                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2397                         out_of_memory("recv_file_list");
2398                 memcpy(flist->sorted, flist->files,
2399                        flist->used * sizeof (struct file_struct*));
2400                 if (inc_recurse && dir_flist->used > dstart) {
2401                         static int dir_flist_malloced = 0;
2402                         if (dir_flist_malloced < dir_flist->malloced) {
2403                                 dir_flist->sorted = realloc_array(dir_flist->sorted,
2404                                                         struct file_struct *,
2405                                                         dir_flist->malloced);
2406                                 dir_flist_malloced = dir_flist->malloced;
2407                         }
2408                         memcpy(dir_flist->sorted + dstart, dir_flist->files + dstart,
2409                                (dir_flist->used - dstart) * sizeof (struct file_struct*));
2410                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2411                 }
2412         } else {
2413                 flist->sorted = flist->files;
2414                 if (inc_recurse && dir_flist->used > dstart) {
2415                         dir_flist->sorted = dir_flist->files;
2416                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2417                 }
2418         }
2419
2420         if (inc_recurse)
2421                 flist_done_allocating(flist);
2422         else if (f >= 0)
2423                 recv_id_list(f, flist);
2424
2425         flist_sort_and_clean(flist, relative_paths);
2426
2427         if (protocol_version < 30) {
2428                 /* Recv the io_error flag */
2429                 if (ignore_errors)
2430                         read_int(f);
2431                 else
2432                         io_error |= read_int(f);
2433         } else if (inc_recurse && flist->ndx_start == 1) {
2434                 if (!file_total || strcmp(flist->sorted[flist->low]->basename, ".") != 0)
2435                         flist->parent_ndx = -1;
2436         }
2437
2438         if (verbose > 3)
2439                 output_flist(flist);
2440
2441         if (verbose > 2)
2442                 rprintf(FINFO, "recv_file_list done\n");
2443
2444         stats.flist_size += stats.total_read - start_read;
2445         stats.num_files += flist->used;
2446
2447         return flist;
2448 }
2449
2450 /* This is only used once by the receiver if the very first file-list
2451  * has exactly one item in it. */
2452 void recv_additional_file_list(int f)
2453 {
2454         struct file_list *flist;
2455         int ndx = read_ndx(f);
2456         if (ndx == NDX_FLIST_EOF) {
2457                 flist_eof = 1;
2458                 change_local_filter_dir(NULL, 0, 0);
2459         } else {
2460                 ndx = NDX_FLIST_OFFSET - ndx;
2461                 if (ndx < 0 || ndx >= dir_flist->used) {
2462                         ndx = NDX_FLIST_OFFSET - ndx;
2463                         rprintf(FERROR,
2464                                 "[%s] Invalid dir index: %d (%d - %d)\n",
2465                                 who_am_i(), ndx, NDX_FLIST_OFFSET,
2466                                 NDX_FLIST_OFFSET - dir_flist->used + 1);
2467                         exit_cleanup(RERR_PROTOCOL);
2468                 }
2469                 if (verbose > 3) {
2470                         rprintf(FINFO, "[%s] receiving flist for dir %d\n",
2471                                 who_am_i(), ndx);
2472                 }
2473                 flist = recv_file_list(f);
2474                 flist->parent_ndx = ndx;
2475         }
2476 }
2477
2478 /* Search for an identically-named item in the file list.  Note that the
2479  * items must agree in their directory-ness, or no match is returned. */
2480 int flist_find(struct file_list *flist, struct file_struct *f)
2481 {
2482         int low = flist->low, high = flist->high;
2483         int diff, mid, mid_up;
2484
2485         while (low <= high) {
2486                 mid = (low + high) / 2;
2487                 if (F_IS_ACTIVE(flist->sorted[mid]))
2488                         mid_up = mid;
2489                 else {
2490                         /* Scan for the next non-empty entry using the cached
2491                          * distance values.  If the value isn't fully up-to-
2492                          * date, update it. */
2493                         mid_up = mid + F_DEPTH(flist->sorted[mid]);
2494                         if (!F_IS_ACTIVE(flist->sorted[mid_up])) {
2495                                 do {
2496                                     mid_up += F_DEPTH(flist->sorted[mid_up]);
2497                                 } while (!F_IS_ACTIVE(flist->sorted[mid_up]));
2498                                 F_DEPTH(flist->sorted[mid]) = mid_up - mid;
2499                         }
2500                         if (mid_up > high) {
2501                                 /* If there's nothing left above us, set high to
2502                                  * a non-empty entry below us and continue. */
2503                                 high = mid - (int)flist->sorted[mid]->len32;
2504                                 if (!F_IS_ACTIVE(flist->sorted[high])) {
2505                                         do {
2506                                             high -= (int)flist->sorted[high]->len32;
2507                                         } while (!F_IS_ACTIVE(flist->sorted[high]));
2508                                         flist->sorted[mid]->len32 = mid - high;
2509                                 }
2510                                 continue;
2511                         }
2512                 }
2513                 diff = f_name_cmp(flist->sorted[mid_up], f);
2514                 if (diff == 0) {
2515                         if (protocol_version < 29
2516                             && S_ISDIR(flist->sorted[mid_up]->mode)
2517                             != S_ISDIR(f->mode))
2518                                 return -1;
2519                         return mid_up;
2520                 }
2521                 if (diff < 0)
2522                         low = mid_up + 1;
2523                 else
2524                         high = mid - 1;
2525         }
2526         return -1;
2527 }
2528
2529 /* Search for an identically-named item in the file list.  Differs from
2530  * flist_find in that an item that agrees with "f" in directory-ness is
2531  * preferred but one that does not is still found. */
2532 int flist_find_ignore_dirness(struct file_list *flist, struct file_struct *f)
2533 {
2534         mode_t save_mode;
2535         int ndx;
2536
2537         /* First look for an item that agrees in directory-ness. */
2538         ndx = flist_find(flist, f);
2539         if (ndx >= 0)
2540                 return ndx;
2541
2542         /* Temporarily flip f->mode to look for an item of opposite
2543          * directory-ness. */
2544         save_mode = f->mode;
2545         f->mode = S_ISDIR(f->mode) ? S_IFREG : S_IFDIR;
2546         ndx = flist_find(flist, f);
2547         f->mode = save_mode;
2548         return ndx;
2549 }
2550
2551 /*
2552  * Free up any resources a file_struct has allocated
2553  * and clear the file.
2554  */
2555 void clear_file(struct file_struct *file)
2556 {
2557         /* The +1 zeros out the first char of the basename. */
2558         memset(file, 0, FILE_STRUCT_LEN + 1);
2559         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
2560          * entry.  Likewise for len32 in the opposite direction.  We assume
2561          * that we're alone for now since flist_find() will adjust the counts
2562          * it runs into that aren't up-to-date. */
2563         file->len32 = F_DEPTH(file) = 1;
2564 }
2565
2566 /* Allocate a new file list. */
2567 struct file_list *flist_new(int flags, char *msg)
2568 {
2569         struct file_list *flist;
2570
2571         if (!(flist = new0(struct file_list)))
2572                 out_of_memory(msg);
2573
2574         if (flags & FLIST_TEMP) {
2575                 if (!(flist->file_pool = pool_create(SMALL_EXTENT, 0,
2576                                                 out_of_memory, POOL_INTERN)))
2577                         out_of_memory(msg);
2578         } else {
2579                 /* This is a doubly linked list with prev looping back to
2580                  * the end of the list, but the last next pointer is NULL. */
2581                 if (!first_flist) {
2582                         flist->file_pool = pool_create(NORMAL_EXTENT, 0,
2583                                                 out_of_memory, POOL_INTERN);
2584                         if (!flist->file_pool)
2585                                 out_of_memory(msg);
2586
2587                         flist->ndx_start = flist->flist_num = inc_recurse ? 1 : 0;
2588
2589                         first_flist = cur_flist = flist->prev = flist;
2590                 } else {
2591                         struct file_list *prev = first_flist->prev;
2592
2593                         flist->file_pool = first_flist->file_pool;
2594
2595                         flist->ndx_start = prev->ndx_start + prev->used + 1;
2596                         flist->flist_num = prev->flist_num + 1;
2597
2598                         flist->prev = prev;
2599                         prev->next = first_flist->prev = flist;
2600                 }
2601                 flist->pool_boundary = pool_boundary(flist->file_pool, 0);
2602                 flist_cnt++;
2603         }
2604
2605         return flist;
2606 }
2607
2608 /* Free up all elements in a flist. */
2609 void flist_free(struct file_list *flist)
2610 {
2611         if (!flist->prev) {
2612                 /* Was FLIST_TEMP dir-list. */
2613         } else if (flist == flist->prev) {
2614                 first_flist = cur_flist = NULL;
2615                 file_total = 0;
2616                 flist_cnt = 0;
2617         } else {
2618                 if (flist == cur_flist)
2619                         cur_flist = flist->next;
2620                 if (flist == first_flist)
2621                         first_flist = first_flist->next;
2622                 else {
2623                         flist->prev->next = flist->next;
2624                         if (!flist->next)
2625                                 flist->next = first_flist;
2626                 }
2627                 flist->next->prev = flist->prev;
2628                 file_total -= flist->used;
2629                 flist_cnt--;
2630         }
2631
2632         if (!flist->prev || !flist_cnt)
2633                 pool_destroy(flist->file_pool);
2634         else
2635                 pool_free_old(flist->file_pool, flist->pool_boundary);
2636
2637         if (flist->sorted && flist->sorted != flist->files)
2638                 free(flist->sorted);
2639         free(flist->files);
2640         free(flist);
2641 }
2642
2643 /* This routine ensures we don't have any duplicate names in our file list.
2644  * duplicate names can cause corruption because of the pipelining. */
2645 static void flist_sort_and_clean(struct file_list *flist, int strip_root)
2646 {
2647         char fbuf[MAXPATHLEN];
2648         int i, prev_i;
2649
2650         if (!flist)
2651                 return;
2652         if (flist->used == 0) {
2653                 flist->high = -1;
2654                 flist->low = 0;
2655                 return;
2656         }
2657
2658         fsort(flist->sorted, flist->used);
2659
2660         if (!am_sender || inc_recurse) {
2661                 for (i = prev_i = 0; i < flist->used; i++) {
2662                         if (F_IS_ACTIVE(flist->sorted[i])) {
2663                                 prev_i = i;
2664                                 break;
2665                         }
2666                 }
2667                 flist->low = prev_i;
2668         } else {
2669                 i = prev_i = flist->used - 1;
2670                 flist->low = 0;
2671         }
2672
2673         while (++i < flist->used) {
2674                 int j;
2675                 struct file_struct *file = flist->sorted[i];
2676
2677                 if (!F_IS_ACTIVE(file))
2678                         continue;
2679                 if (f_name_cmp(file, flist->sorted[prev_i]) == 0)
2680                         j = prev_i;
2681                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
2682                         int save_mode = file->mode;
2683                         /* Make sure that this directory doesn't duplicate a
2684                          * non-directory earlier in the list. */
2685                         flist->high = prev_i;
2686                         file->mode = S_IFREG;
2687                         j = flist_find(flist, file);
2688                         file->mode = save_mode;
2689                 } else
2690                         j = -1;
2691                 if (j >= 0) {
2692                         int keep, drop;
2693                         /* If one is a dir and the other is not, we want to
2694                          * keep the dir because it might have contents in the
2695                          * list.  Otherwise keep the first one. */
2696                         if (S_ISDIR(file->mode)) {
2697                                 struct file_struct *fp = flist->sorted[j];
2698                                 if (!S_ISDIR(fp->mode))
2699                                         keep = i, drop = j;
2700                                 else {
2701                                         if (am_sender)
2702                                                 file->flags |= FLAG_DUPLICATE;
2703                                         else { /* Make sure we merge our vital flags. */
2704                                                 fp->flags |= file->flags & (FLAG_TOP_DIR|FLAG_CONTENT_DIR);
2705                                                 fp->flags &= file->flags | ~FLAG_IMPLIED_DIR;
2706                                         }
2707                                         keep = j, drop = i;
2708                                 }
2709                         } else
2710                                 keep = j, drop = i;
2711
2712                         if (!am_sender) {
2713                                 if (verbose > 1) {
2714                                         rprintf(FINFO,
2715                                             "removing duplicate name %s from file list (%d)\n",
2716                                             f_name(file, fbuf), drop + flist->ndx_start);
2717                                 }
2718                                 clear_file(flist->sorted[drop]);
2719                         }
2720
2721                         if (keep == i) {
2722                                 if (flist->low == drop) {
2723                                         for (j = drop + 1;
2724                                              j < i && !F_IS_ACTIVE(flist->sorted[j]);
2725                                              j++) {}
2726                                         flist->low = j;
2727                                 }
2728                                 prev_i = i;
2729                         }
2730                 } else
2731                         prev_i = i;
2732         }
2733         flist->high = prev_i;
2734
2735         if (strip_root) {
2736                 /* We need to strip off the leading slashes for relative
2737                  * paths, but this must be done _after_ the sorting phase. */
2738                 for (i = flist->low; i <= flist->high; i++) {
2739                         struct file_struct *file = flist->sorted[i];
2740
2741                         if (!file->dirname)
2742                                 continue;
2743                         while (*file->dirname == '/')
2744                                 file->dirname++;
2745                         if (!*file->dirname)
2746                                 file->dirname = NULL;
2747                 }
2748         }
2749
2750         if (prune_empty_dirs && !am_sender) {
2751                 int j, prev_depth = 0;
2752
2753                 prev_i = 0; /* It's OK that this isn't really true. */
2754
2755                 for (i = flist->low; i <= flist->high; i++) {
2756                         struct file_struct *fp, *file = flist->sorted[i];
2757
2758                         /* This temporarily abuses the F_DEPTH() value for a
2759                          * directory that is in a chain that might get pruned.
2760                          * We restore the old value if it gets a reprieve. */
2761                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2762                                 /* Dump empty dirs when coming back down. */
2763                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2764                                         fp = flist->sorted[prev_i];
2765                                         if (F_DEPTH(fp) >= 0)
2766                                                 break;
2767                                         prev_i = -F_DEPTH(fp)-1;
2768                                         clear_file(fp);
2769                                 }
2770                                 prev_depth = F_DEPTH(file);
2771                                 if (is_excluded(f_name(file, fbuf), 1,
2772                                                        ALL_FILTERS)) {
2773                                         /* Keep dirs through this dir. */
2774                                         for (j = prev_depth-1; ; j--) {
2775                                                 fp = flist->sorted[prev_i];
2776                                                 if (F_DEPTH(fp) >= 0)
2777                                                         break;
2778                                                 prev_i = -F_DEPTH(fp)-1;
2779                                                 F_DEPTH(fp) = j;
2780                                         }
2781                                 } else
2782                                         F_DEPTH(file) = -prev_i-1;
2783                                 prev_i = i;
2784                         } else {
2785                                 /* Keep dirs through this non-dir. */
2786                                 for (j = prev_depth; ; j--) {
2787                                         fp = flist->sorted[prev_i];
2788                                         if (F_DEPTH(fp) >= 0)
2789                                                 break;
2790                                         prev_i = -F_DEPTH(fp)-1;
2791                                         F_DEPTH(fp) = j;
2792                                 }
2793                         }
2794                 }
2795                 /* Dump all remaining empty dirs. */
2796                 while (1) {
2797                         struct file_struct *fp = flist->sorted[prev_i];
2798                         if (F_DEPTH(fp) >= 0)
2799                                 break;
2800                         prev_i = -F_DEPTH(fp)-1;
2801                         clear_file(fp);
2802                 }
2803
2804                 for (i = flist->low; i <= flist->high; i++) {
2805                         if (F_IS_ACTIVE(flist->sorted[i]))
2806                                 break;
2807                 }
2808                 flist->low = i;
2809                 for (i = flist->high; i >= flist->low; i--) {
2810                         if (F_IS_ACTIVE(flist->sorted[i]))
2811                                 break;
2812                 }
2813                 flist->high = i;
2814         }
2815 }
2816
2817 static void output_flist(struct file_list *flist)
2818 {
2819         char uidbuf[16], gidbuf[16], depthbuf[16];
2820         struct file_struct *file;
2821         const char *root, *dir, *slash, *name, *trail;
2822         const char *who = who_am_i();
2823         int i;
2824
2825         rprintf(FINFO, "[%s] flist start=%d, used=%d, low=%d, high=%d\n",
2826                 who, flist->ndx_start, flist->used, flist->low, flist->high);
2827         for (i = 0; i < flist->used; i++) {
2828                 file = flist->files[i];
2829                 if ((am_root || am_sender) && uid_ndx) {
2830                         snprintf(uidbuf, sizeof uidbuf, " uid=%u",
2831                                  F_OWNER(file));
2832                 } else
2833                         *uidbuf = '\0';
2834                 if (gid_ndx) {
2835                         static char parens[] = "(\0)\0\0\0";
2836                         char *pp = parens + (file->flags & FLAG_SKIP_GROUP ? 0 : 3);
2837                         snprintf(gidbuf, sizeof gidbuf, " gid=%s%u%s",
2838                                  pp, F_GROUP(file), pp + 2);
2839                 } else
2840                         *gidbuf = '\0';
2841                 if (!am_sender)
2842                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2843                 if (F_IS_ACTIVE(file)) {
2844                         root = am_sender ? NS(F_PATHNAME(file)) : depthbuf;
2845                         if ((dir = file->dirname) == NULL)
2846                                 dir = slash = "";
2847                         else
2848                                 slash = "/";
2849                         name = file->basename;
2850                         trail = S_ISDIR(file->mode) ? "/" : "";
2851                 } else
2852                         root = dir = slash = name = trail = "";
2853                 rprintf(FINFO,
2854                         "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
2855                         who, i + flist->ndx_start,
2856                         root, dir, slash, name, trail,
2857                         (int)file->mode, (double)F_LENGTH(file),
2858                         uidbuf, gidbuf, file->flags);
2859         }
2860 }
2861
2862 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2863 enum fnc_type { t_PATH, t_ITEM };
2864
2865 static int found_prefix;
2866
2867 /* Compare the names of two file_struct entities, similar to how strcmp()
2868  * would do if it were operating on the joined strings.
2869  *
2870  * Some differences beginning with protocol_version 29: (1) directory names
2871  * are compared with an assumed trailing slash so that they compare in a
2872  * way that would cause them to sort immediately prior to any content they
2873  * may have; (2) a directory of any name compares after a non-directory of
2874  * any name at the same depth; (3) a directory with name "." compares prior
2875  * to anything else.  These changes mean that a directory and a non-dir
2876  * with the same name will not compare as equal (protocol_version >= 29).
2877  *
2878  * The dirname component can be an empty string, but the basename component
2879  * cannot (and never is in the current codebase).  The basename component
2880  * may be NULL (for a removed item), in which case it is considered to be
2881  * after any existing item. */
2882 int f_name_cmp(const struct file_struct *f1, const struct file_struct *f2)
2883 {
2884         int dif;
2885         const uchar *c1, *c2;
2886         enum fnc_state state1, state2;
2887         enum fnc_type type1, type2;
2888         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
2889
2890         if (!f1 || !F_IS_ACTIVE(f1)) {
2891                 if (!f2 || !F_IS_ACTIVE(f2))
2892                         return 0;
2893                 return -1;
2894         }
2895         if (!f2 || !F_IS_ACTIVE(f2))
2896                 return 1;
2897
2898         c1 = (uchar*)f1->dirname;
2899         c2 = (uchar*)f2->dirname;
2900         if (c1 == c2)
2901                 c1 = c2 = NULL;
2902         if (!c1) {
2903                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2904                 c1 = (const uchar*)f1->basename;
2905                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2906                         type1 = t_ITEM;
2907                         state1 = s_TRAILING;
2908                         c1 = (uchar*)"";
2909                 } else
2910                         state1 = s_BASE;
2911         } else {
2912                 type1 = t_path;
2913                 state1 = s_DIR;
2914         }
2915         if (!c2) {
2916                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2917                 c2 = (const uchar*)f2->basename;
2918                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2919                         type2 = t_ITEM;
2920                         state2 = s_TRAILING;
2921                         c2 = (uchar*)"";
2922                 } else
2923                         state2 = s_BASE;
2924         } else {
2925                 type2 = t_path;
2926                 state2 = s_DIR;
2927         }
2928
2929         if (type1 != type2)
2930                 return type1 == t_PATH ? 1 : -1;
2931
2932         do {
2933                 if (!*c1) {
2934                         switch (state1) {
2935                         case s_DIR:
2936                                 state1 = s_SLASH;
2937                                 c1 = (uchar*)"/";
2938                                 break;
2939                         case s_SLASH:
2940                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2941                                 c1 = (const uchar*)f1->basename;
2942                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2943                                         type1 = t_ITEM;
2944                                         state1 = s_TRAILING;
2945                                         c1 = (uchar*)"";
2946                                 } else
2947                                         state1 = s_BASE;
2948                                 break;
2949                         case s_BASE:
2950                                 state1 = s_TRAILING;
2951                                 if (type1 == t_PATH) {
2952                                         c1 = (uchar*)"/";
2953                                         break;
2954                                 }
2955                                 /* FALL THROUGH */
2956                         case s_TRAILING:
2957                                 type1 = t_ITEM;
2958                                 break;
2959                         }
2960                         if (*c2 && type1 != type2)
2961                                 return type1 == t_PATH ? 1 : -1;
2962                 }
2963                 if (!*c2) {
2964                         switch (state2) {
2965                         case s_DIR:
2966                                 state2 = s_SLASH;
2967                                 c2 = (uchar*)"/";
2968                                 break;
2969                         case s_SLASH:
2970                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2971                                 c2 = (const uchar*)f2->basename;
2972                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2973                                         type2 = t_ITEM;
2974                                         state2 = s_TRAILING;
2975                                         c2 = (uchar*)"";
2976                                 } else
2977                                         state2 = s_BASE;
2978                                 break;
2979                         case s_BASE:
2980                                 state2 = s_TRAILING;
2981                                 if (type2 == t_PATH) {
2982                                         c2 = (uchar*)"/";
2983                                         break;
2984                                 }
2985                                 /* FALL THROUGH */
2986                         case s_TRAILING:
2987                                 found_prefix = 1;
2988                                 if (!*c1)
2989                                         return 0;
2990                                 type2 = t_ITEM;
2991                                 break;
2992                         }
2993                         if (type1 != type2)
2994                                 return type1 == t_PATH ? 1 : -1;
2995                 }
2996         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
2997
2998         return dif;
2999 }
3000
3001 /* Returns 1 if f1's filename has all of f2's filename as a prefix.  This does
3002  * not match if f2's basename is not an exact match of a path element in f1.
3003  * E.g. /path/foo is not a prefix of /path/foobar/baz, but /path/foobar is. */
3004 int f_name_has_prefix(const struct file_struct *f1, const struct file_struct *f2)
3005 {
3006         found_prefix = 0;
3007         f_name_cmp(f1, f2);
3008         return found_prefix;
3009 }
3010
3011 char *f_name_buf(void)
3012 {
3013         static char names[5][MAXPATHLEN];
3014         static unsigned int n;
3015
3016         n = (n + 1) % (sizeof names / sizeof names[0]);
3017
3018         return names[n];
3019 }
3020
3021 /* Return a copy of the full filename of a flist entry, using the indicated
3022  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
3023  * done because we checked the size when creating the file_struct entry.
3024  */
3025 char *f_name(const struct file_struct *f, char *fbuf)
3026 {
3027         if (!f || !F_IS_ACTIVE(f))
3028                 return NULL;
3029
3030         if (!fbuf)
3031                 fbuf = f_name_buf();
3032
3033         if (f->dirname) {
3034                 int len = strlen(f->dirname);
3035                 memcpy(fbuf, f->dirname, len);
3036                 fbuf[len] = '/';
3037                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
3038         } else
3039                 strlcpy(fbuf, f->basename, MAXPATHLEN);
3040
3041         return fbuf;
3042 }
3043
3044 /* Do a non-recursive scan of the named directory, possibly ignoring all
3045  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
3046  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
3047  * buffer (the functions we call will append names onto the end, but the old
3048  * dir value will be restored on exit). */
3049 struct file_list *get_dirlist(char *dirname, int dlen, int flags)
3050 {
3051         struct file_list *dirlist;
3052         char dirbuf[MAXPATHLEN];
3053         int save_recurse = recurse;
3054         int save_xfer_dirs = xfer_dirs;
3055         int save_prune_empty_dirs = prune_empty_dirs;
3056         int senddir_fd = flags & GDL_IGNORE_FILTER_RULES ? -2 : -1;
3057
3058         if (dlen < 0) {
3059                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
3060                 if (dlen >= MAXPATHLEN)
3061                         return NULL;
3062                 dirname = dirbuf;
3063         }
3064
3065         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
3066
3067         recurse = 0;
3068         xfer_dirs = 1;
3069         send_directory(senddir_fd, dirlist, dirname, dlen,
3070                        FLAG_CONTENT_DIR | (flags & GDL_DEL_NEEDS_UID ? FLAG_DEL_NEEDS_UID : 0));
3071         xfer_dirs = save_xfer_dirs;
3072         recurse = save_recurse;
3073         if (do_progress)
3074                 flist_count_offset += dirlist->used;
3075
3076         prune_empty_dirs = 0;
3077         dirlist->sorted = dirlist->files;
3078         flist_sort_and_clean(dirlist, 0);
3079         prune_empty_dirs = save_prune_empty_dirs;
3080
3081         if (verbose > 3)
3082                 output_flist(dirlist);
3083
3084         return dirlist;
3085 }