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 "inums.h"
  27 #include "io.h"
  28
  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 always_checksum;
  36 extern int module_id;
  37 extern int ignore_errors;
  38 extern int numeric_ids;
  39 extern int recurse;
  40 extern int use_qsort;
  41 extern int xfer_dirs;
  42 extern int filesfrom_fd;
  43 extern int one_file_system;
  44 extern int copy_dirlinks;
  45 extern int preserve_uid;
  46 extern int preserve_gid;
  47 extern int preserve_acls;
  48 extern int preserve_xattrs;
  49 extern int preserve_links;
  50 extern int preserve_hard_links;
  51 extern int preserve_devices;
  52 extern int preserve_specials;
  53 extern int delete_during;
  54 extern int missing_args;
  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 output_needs_newline;
  70 extern int sender_keeps_checksum;
  71 extern int unsort_ndx;
  72 extern uid_t our_uid;
  73 extern struct stats stats;
  74 extern char *filesfrom_host;
  75 extern char *usermap, *groupmap;
  76
  77 extern char curr_dir[MAXPATHLEN];
  78
  79 extern struct chmod_mode_struct *chmod_modes;
  80
  81 extern filter_rule_list filter_list;
  82 extern filter_rule_list daemon_filter_list;
  83
  84 #ifdef ICONV_OPTION
  85 extern int filesfrom_convert;
  86 extern iconv_t ic_send, ic_recv;
  87 #endif
  88
  89 #define PTR_SIZE (sizeof (struct file_struct *))
  90
  91 int io_error;
  92 int checksum_len;
  93 dev_t filesystem_dev; /* used to implement -x */
  94
  95 struct file_list *cur_flist, *first_flist, *dir_flist;
  96 int send_dir_ndx = -1, send_dir_depth = -1;
  97 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
  98 int file_total = 0; /* total of all active items over all file-lists */
  99 int file_old_total = 0; /* total of active items that will soon be gone */
 100 int flist_eof = 0; /* all the file-lists are now known */
 101
 102 #define NORMAL_NAME 0
 103 #define SLASH_ENDING_NAME 1
 104 #define DOTDIR_NAME 2
 105
 106 /* Starting from protocol version 26, we always use 64-bit ino_t and dev_t
 107  * internally, even if this platform does not allow files to have 64-bit inums.
 108  * The only exception is if we're on a platform with no 64-bit type at all.
 109  *
 110  * Because we use read_longint() to get these off the wire, if you transfer
 111  * devices or (for protocols < 30) hardlinks with dev or inum > 2**32 to a
 112  * machine with no 64-bit types then you will get an overflow error.
 113  *
 114  * Note that if you transfer devices from a 64-bit-devt machine (say, Solaris)
 115  * to a 32-bit-devt machine (say, Linux-2.2/x86) then the device numbers will
 116  * be truncated.  But it's a kind of silly thing to do anyhow. */
 117
 118 /* The tmp_* vars are used as a cache area by make_file() to store data
 119  * that the sender doesn't need to remember in its file list.  The data
 120  * will survive just long enough to be used by send_file_entry(). */
 121 static dev_t tmp_rdev;
 122 #ifdef SUPPORT_HARD_LINKS
 123 static int64 tmp_dev = -1, tmp_ino;
 124 #endif
 125 static char tmp_sum[MAX_DIGEST_LEN];
 126
 127 static char empty_sum[MAX_DIGEST_LEN];
 128 static int flist_count_offset; /* for --delete --progress */
 129
 130 static void flist_sort_and_clean(struct file_list *flist, int strip_root);
 131 static void output_flist(struct file_list *flist);
 132
 133 void init_flist(void)
 134 {
 135         if (DEBUG_GTE(FLIST, 4)) {
 136                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
 137                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
 138         }
 139         checksum_len = protocol_version < 21 ? 2
 140                      : protocol_version < 30 ? MD4_DIGEST_LEN
 141                      : MD5_DIGEST_LEN;
 142 }
 143
 144 static int show_filelist_p(void)
 145 {
 146         return INFO_GTE(FLIST, 1) && xfer_dirs && !am_server && !inc_recurse;
 147 }
 148
 149 static void start_filelist_progress(char *kind)
 150 {
 151         rprintf(FCLIENT, "%s ... ", kind);
 152         output_needs_newline = 1;
 153         rflush(FINFO);
 154 }
 155
 156 static void emit_filelist_progress(int count)
 157 {
 158         rprintf(FCLIENT, " %d files...\r", count);
 159 }
 160
 161 static void maybe_emit_filelist_progress(int count)
 162 {
 163         if (INFO_GTE(FLIST, 2) && show_filelist_p() && (count % 100) == 0)
 164                 emit_filelist_progress(count);
 165 }
 166
 167 static void finish_filelist_progress(const struct file_list *flist)
 168 {
 169         if (INFO_GTE(FLIST, 2)) {
 170                 /* This overwrites the progress line */
 171                 rprintf(FINFO, "%d file%sto consider\n",
 172                         flist->used, flist->used == 1 ? " " : "s ");
 173         } else {
 174                 output_needs_newline = 0;
 175                 rprintf(FINFO, "done\n");
 176         }
 177 }
 178
 179 void show_flist_stats(void)
 180 {
 181         /* Nothing yet */
 182 }
 183
 184 /* Stat either a symlink or its referent, depending on the settings of
 185  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 186  *
 187  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 188  * MAXPATHLEN chars) will be set to the symlink's target string.
 189  *
 190  * The stat structure pointed to by stp will contain information about the
 191  * link or the referent as appropriate, if they exist. */
 192 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 193 {
 194 #ifdef SUPPORT_LINKS
 195         if (link_stat(path, stp, copy_dirlinks) < 0)
 196                 return -1;
 197         if (S_ISLNK(stp->st_mode)) {
 198                 int llen = do_readlink(path, linkbuf, MAXPATHLEN - 1);
 199                 if (llen < 0)
 200                         return -1;
 201                 linkbuf[llen] = '\0';
 202                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 203                         if (INFO_GTE(SYMSAFE, 1)) {
 204                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 205                                         path, linkbuf);
 206                         }
 207                         return x_stat(path, stp, NULL);
 208                 }
 209                 if (munge_symlinks && am_sender && llen > SYMLINK_PREFIX_LEN
 210                  && strncmp(linkbuf, SYMLINK_PREFIX, SYMLINK_PREFIX_LEN) == 0) {
 211                         memmove(linkbuf, linkbuf + SYMLINK_PREFIX_LEN,
 212                                 llen - SYMLINK_PREFIX_LEN + 1);
 213                 }
 214         }
 215         return 0;
 216 #else
 217         return x_stat(path, stp, NULL);
 218 #endif
 219 }
 220
 221 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 222 {
 223 #ifdef SUPPORT_LINKS
 224         if (copy_links)
 225                 return x_stat(path, stp, NULL);
 226         if (x_lstat(path, stp, NULL) < 0)
 227                 return -1;
 228         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 229                 STRUCT_STAT st;
 230                 if (x_stat(path, &st, NULL) == 0 && S_ISDIR(st.st_mode))
 231                         *stp = st;
 232         }
 233         return 0;
 234 #else
 235         return x_stat(path, stp, NULL);
 236 #endif
 237 }
 238
 239 static inline int is_daemon_excluded(const char *fname, int is_dir)
 240 {
 241         if (daemon_filter_list.head
 242          && check_filter(&daemon_filter_list, FLOG, fname, is_dir) < 0) {
 243                 errno = ENOENT;
 244                 return 1;
 245         }
 246         return 0;
 247 }
 248
 249 static inline int path_is_daemon_excluded(char *path, int ignore_filename)
 250 {
 251         if (daemon_filter_list.head) {
 252                 char *slash = path;
 253
 254                 while ((slash = strchr(slash+1, '/')) != NULL) {
 255                         int ret;
 256                         *slash = '\0';
 257                         ret = check_filter(&daemon_filter_list, FLOG, path, 1);
 258                         *slash = '/';
 259                         if (ret < 0) {
 260                                 errno = ENOENT;
 261                                 return 1;
 262                         }
 263                 }
 264
 265                 if (!ignore_filename
 266                  && check_filter(&daemon_filter_list, FLOG, path, 1) < 0) {
 267                         errno = ENOENT;
 268                         return 1;
 269                 }
 270         }
 271
 272         return 0;
 273 }
 274
 275 /* This function is used to check if a file should be included/excluded
 276  * from the list of files based on its name and type etc.  The value of
 277  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 278 static int is_excluded(const char *fname, int is_dir, int filter_level)
 279 {
 280 #if 0 /* This currently never happens, so avoid a useless compare. */
 281         if (filter_level == NO_FILTERS)
 282                 return 0;
 283 #endif
 284         if (is_daemon_excluded(fname, is_dir))
 285                 return 1;
 286         if (filter_level != ALL_FILTERS)
 287                 return 0;
 288         if (filter_list.head
 289             && check_filter(&filter_list, FINFO, fname, is_dir) < 0)
 290                 return 1;
 291         return 0;
 292 }
 293
 294 static void send_directory(int f, struct file_list *flist,
 295                            char *fbuf, int len, int flags);
 296
 297 static const char *pathname, *orig_dir;
 298 static int pathname_len;
 299
 300 /* Make sure flist can hold at least flist->used + extra entries. */
 301 static void flist_expand(struct file_list *flist, int extra)
 302 {
 303         struct file_struct **new_ptr;
 304
 305         if (flist->used + extra <= flist->malloced)
 306                 return;
 307
 308         if (flist->malloced < FLIST_START)
 309                 flist->malloced = FLIST_START;
 310         else if (flist->malloced >= FLIST_LINEAR)
 311                 flist->malloced += FLIST_LINEAR;
 312         else
 313                 flist->malloced *= 2;
 314
 315         /* In case count jumped or we are starting the list
 316          * with a known size just set it. */
 317         if (flist->malloced < flist->used + extra)
 318                 flist->malloced = flist->used + extra;
 319
 320         new_ptr = realloc_array(flist->files, struct file_struct *,
 321                                 flist->malloced);
 322
 323         if (DEBUG_GTE(FLIST, 1) && flist->malloced != FLIST_START) {
 324                 rprintf(FCLIENT, "[%s] expand file_list pointer array to %s bytes, did%s move\n",
 325                     who_am_i(),
 326                     big_num(sizeof flist->files[0] * flist->malloced),
 327                     (new_ptr == flist->files) ? " not" : "");
 328         }
 329
 330         flist->files = new_ptr;
 331
 332         if (!flist->files)
 333                 out_of_memory("flist_expand");
 334 }
 335
 336 static void flist_done_allocating(struct file_list *flist)
 337 {
 338         void *ptr = pool_boundary(flist->file_pool, 8*1024);
 339         if (flist->pool_boundary == ptr)
 340                 flist->pool_boundary = NULL; /* list didn't use any pool memory */
 341         else
 342                 flist->pool_boundary = ptr;
 343 }
 344
 345 /* Call this with EITHER (1) "file, NULL, 0" to chdir() to the file's
 346  * F_PATHNAME(), or (2) "NULL, dir, dirlen" to chdir() to the supplied dir,
 347  * with dir == NULL taken to be the starting directory, and dirlen < 0
 348  * indicating that strdup(dir) should be called and then the -dirlen length
 349  * value checked to ensure that it is not daemon-excluded. */
 350 int change_pathname(struct file_struct *file, const char *dir, int dirlen)
 351 {
 352         if (dirlen < 0) {
 353                 char *cpy = strdup(dir);
 354                 if (*cpy != '/')
 355                         change_dir(orig_dir, CD_SKIP_CHDIR);
 356                 if (path_is_daemon_excluded(cpy, 0))
 357                         goto chdir_error;
 358                 dir = cpy;
 359                 dirlen = -dirlen;
 360         } else {
 361                 if (file) {
 362                         if (pathname == F_PATHNAME(file))
 363                                 return 1;
 364                         dir = F_PATHNAME(file);
 365                         if (dir)
 366                                 dirlen = strlen(dir);
 367                 } else if (pathname == dir)
 368                         return 1;
 369                 if (dir && *dir != '/')
 370                         change_dir(orig_dir, CD_SKIP_CHDIR);
 371         }
 372
 373         pathname = dir;
 374         pathname_len = dirlen;
 375
 376         if (!dir)
 377                 dir = orig_dir;
 378
 379         if (!change_dir(dir, CD_NORMAL)) {
 380           chdir_error:
 381                 io_error |= IOERR_GENERAL;
 382                 rsyserr(FERROR_XFER, errno, "change_dir %s failed", full_fname(dir));
 383                 if (dir != orig_dir)
 384                         change_dir(orig_dir, CD_NORMAL);
 385                 pathname = NULL;
 386                 pathname_len = 0;
 387                 return 0;
 388         }
 389
 390         return 1;
 391 }
 392
 393 static void send_file_entry(int f, const char *fname, struct file_struct *file,
 394 #ifdef SUPPORT_LINKS
 395                             const char *symlink_name, int symlink_len,
 396 #endif
 397                             int ndx, int first_ndx)
 398 {
 399         static time_t modtime;
 400         static mode_t mode;
 401 #ifdef SUPPORT_HARD_LINKS
 402         static int64 dev;
 403 #endif
 404         static dev_t rdev;
 405         static uint32 rdev_major;
 406         static uid_t uid;
 407         static gid_t gid;
 408         static const char *user_name, *group_name;
 409         static char lastname[MAXPATHLEN];
 410 #ifdef SUPPORT_HARD_LINKS
 411         int first_hlink_ndx = -1;
 412 #endif
 413         int l1, l2;
 414         int xflags;
 415
 416         /* Initialize starting value of xflags and adjust counts. */
 417         if (S_ISREG(file->mode))
 418                 xflags = 0;
 419         else if (S_ISDIR(file->mode)) {
 420                 stats.num_dirs++;
 421                 if (protocol_version >= 30) {
 422                         if (file->flags & FLAG_CONTENT_DIR)
 423                                 xflags = file->flags & FLAG_TOP_DIR;
 424                         else if (file->flags & FLAG_IMPLIED_DIR)
 425                                 xflags = XMIT_TOP_DIR | XMIT_NO_CONTENT_DIR;
 426                         else
 427                                 xflags = XMIT_NO_CONTENT_DIR;
 428                 } else
 429                         xflags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 430         } else {
 431                 if (S_ISLNK(file->mode))
 432                         stats.num_symlinks++;
 433                 else if (IS_DEVICE(file->mode))
 434                         stats.num_devices++;
 435                 else if (IS_SPECIAL(file->mode))
 436                         stats.num_specials++;
 437                 xflags = 0;
 438         }
 439
 440         if (file->mode == mode)
 441                 xflags |= XMIT_SAME_MODE;
 442         else
 443                 mode = file->mode;
 444
 445         if (preserve_devices && IS_DEVICE(mode)) {
 446                 if (protocol_version < 28) {
 447                         if (tmp_rdev == rdev)
 448                                 xflags |= XMIT_SAME_RDEV_pre28;
 449                         else
 450                                 rdev = tmp_rdev;
 451                 } else {
 452                         rdev = tmp_rdev;
 453                         if ((uint32)major(rdev) == rdev_major)
 454                                 xflags |= XMIT_SAME_RDEV_MAJOR;
 455                         else
 456                                 rdev_major = major(rdev);
 457                         if (protocol_version < 30 && (uint32)minor(rdev) <= 0xFFu)
 458                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
 459                 }
 460         } else if (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31) {
 461                 /* Special files don't need an rdev number, so just make
 462                  * the historical transmission of the value efficient. */
 463                 if (protocol_version < 28)
 464                         xflags |= XMIT_SAME_RDEV_pre28;
 465                 else {
 466                         rdev = MAKEDEV(major(rdev), 0);
 467                         xflags |= XMIT_SAME_RDEV_MAJOR;
 468                         if (protocol_version < 30)
 469                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
 470                 }
 471         } else if (protocol_version < 28)
 472                 rdev = MAKEDEV(0, 0);
 473         if (!preserve_uid || ((uid_t)F_OWNER(file) == uid && *lastname))
 474                 xflags |= XMIT_SAME_UID;
 475         else {
 476                 uid = F_OWNER(file);
 477                 if (!numeric_ids) {
 478                         user_name = add_uid(uid);
 479                         if (inc_recurse && user_name)
 480                                 xflags |= XMIT_USER_NAME_FOLLOWS;
 481                 }
 482         }
 483         if (!preserve_gid || ((gid_t)F_GROUP(file) == gid && *lastname))
 484                 xflags |= XMIT_SAME_GID;
 485         else {
 486                 gid = F_GROUP(file);
 487                 if (!numeric_ids) {
 488                         group_name = add_gid(gid);
 489                         if (inc_recurse && group_name)
 490                                 xflags |= XMIT_GROUP_NAME_FOLLOWS;
 491                 }
 492         }
 493         if (file->modtime == modtime)
 494                 xflags |= XMIT_SAME_TIME;
 495         else
 496                 modtime = file->modtime;
 497         if (NSEC_BUMP(file) && protocol_version >= 31)
 498                 xflags |= XMIT_MOD_NSEC;
 499
 500 #ifdef SUPPORT_HARD_LINKS
 501         if (tmp_dev != -1) {
 502                 if (protocol_version >= 30) {
 503                         struct ht_int64_node *np = idev_find(tmp_dev, tmp_ino);
 504                         first_hlink_ndx = (int32)(long)np->data - 1;
 505                         if (first_hlink_ndx < 0) {
 506                                 np->data = (void*)(long)(first_ndx + ndx + 1);
 507                                 xflags |= XMIT_HLINK_FIRST;
 508                         }
 509                         if (DEBUG_GTE(HLINK, 1)) {
 510                                 if (first_hlink_ndx >= 0) {
 511                                         rprintf(FINFO, "[%s] #%d hard-links #%d (%sabbrev)\n",
 512                                                 who_am_i(), first_ndx + ndx, first_hlink_ndx,
 513                                                 first_hlink_ndx >= first_ndx ? "" : "un");
 514                                 } else if (DEBUG_GTE(HLINK, 3)) {
 515                                         rprintf(FINFO, "[%s] dev:inode for #%d is %s:%s\n",
 516                                                 who_am_i(), first_ndx + ndx,
 517                                                 big_num(tmp_dev), big_num(tmp_ino));
 518                                 }
 519                         }
 520                 } else {
 521                         if (tmp_dev == dev) {
 522                                 if (protocol_version >= 28)
 523                                         xflags |= XMIT_SAME_DEV_pre30;
 524                         } else
 525                                 dev = tmp_dev;
 526                 }
 527                 xflags |= XMIT_HLINKED;
 528         }
 529 #endif
 530
 531         for (l1 = 0;
 532             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 533             l1++) {}
 534         l2 = strlen(fname+l1);
 535
 536         if (l1 > 0)
 537                 xflags |= XMIT_SAME_NAME;
 538         if (l2 > 255)
 539                 xflags |= XMIT_LONG_NAME;
 540
 541         /* We must make sure we don't send a zero flag byte or the
 542          * other end will terminate the flist transfer.  Note that
 543          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 544          * it's harmless way to add a bit to the first flag byte. */
 545         if (protocol_version >= 28) {
 546                 if (!xflags && !S_ISDIR(mode))
 547                         xflags |= XMIT_TOP_DIR;
 548                 if ((xflags & 0xFF00) || !xflags) {
 549                         xflags |= XMIT_EXTENDED_FLAGS;
 550                         write_shortint(f, xflags);
 551                 } else
 552                         write_byte(f, xflags);
 553         } else {
 554                 if (!(xflags & 0xFF))
 555                         xflags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 556                 write_byte(f, xflags);
 557         }
 558         if (xflags & XMIT_SAME_NAME)
 559                 write_byte(f, l1);
 560         if (xflags & XMIT_LONG_NAME)
 561                 write_varint30(f, l2);
 562         else
 563                 write_byte(f, l2);
 564         write_buf(f, fname + l1, l2);
 565
 566 #ifdef SUPPORT_HARD_LINKS
 567         if (first_hlink_ndx >= 0) {
 568                 write_varint(f, first_hlink_ndx);
 569                 if (first_hlink_ndx >= first_ndx)
 570                         goto the_end;
 571         }
 572 #endif
 573
 574         write_varlong30(f, F_LENGTH(file), 3);
 575         if (!(xflags & XMIT_SAME_TIME)) {
 576                 if (protocol_version >= 30)
 577                         write_varlong(f, modtime, 4);
 578                 else
 579                         write_int(f, modtime);
 580         }
 581         if (xflags & XMIT_MOD_NSEC)
 582                 write_varint(f, F_MOD_NSEC(file));
 583         if (!(xflags & XMIT_SAME_MODE))
 584                 write_int(f, to_wire_mode(mode));
 585         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
 586                 if (protocol_version < 30)
 587                         write_int(f, uid);
 588                 else {
 589                         write_varint(f, uid);
 590                         if (xflags & XMIT_USER_NAME_FOLLOWS) {
 591                                 int len = strlen(user_name);
 592                                 write_byte(f, len);
 593                                 write_buf(f, user_name, len);
 594                         }
 595                 }
 596         }
 597         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
 598                 if (protocol_version < 30)
 599                         write_int(f, gid);
 600                 else {
 601                         write_varint(f, gid);
 602                         if (xflags & XMIT_GROUP_NAME_FOLLOWS) {
 603                                 int len = strlen(group_name);
 604                                 write_byte(f, len);
 605                                 write_buf(f, group_name, len);
 606                         }
 607                 }
 608         }
 609         if ((preserve_devices && IS_DEVICE(mode))
 610          || (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31)) {
 611                 if (protocol_version < 28) {
 612                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 613                                 write_int(f, (int)rdev);
 614                 } else {
 615                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 616                                 write_varint30(f, major(rdev));
 617                         if (protocol_version >= 30)
 618                                 write_varint(f, minor(rdev));
 619                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 620                                 write_byte(f, minor(rdev));
 621                         else
 622                                 write_int(f, minor(rdev));
 623                 }
 624         }
 625
 626 #ifdef SUPPORT_LINKS
 627         if (symlink_len) {
 628                 write_varint30(f, symlink_len);
 629                 write_buf(f, symlink_name, symlink_len);
 630         }
 631 #endif
 632
 633 #ifdef SUPPORT_HARD_LINKS
 634         if (tmp_dev != -1 && protocol_version < 30) {
 635                 /* Older protocols expect the dev number to be transmitted
 636                  * 1-incremented so that it is never zero. */
 637                 if (protocol_version < 26) {
 638                         /* 32-bit dev_t and ino_t */
 639                         write_int(f, (int32)(dev+1));
 640                         write_int(f, (int32)tmp_ino);
 641                 } else {
 642                         /* 64-bit dev_t and ino_t */
 643                         if (!(xflags & XMIT_SAME_DEV_pre30))
 644                                 write_longint(f, dev+1);
 645                         write_longint(f, tmp_ino);
 646                 }
 647         }
 648 #endif
 649
 650         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 651                 const char *sum;
 652                 if (S_ISREG(mode))
 653                         sum = tmp_sum;
 654                 else {
 655                         /* Prior to 28, we sent a useless set of nulls. */
 656                         sum = empty_sum;
 657                 }
 658                 write_buf(f, sum, checksum_len);
 659         }
 660
 661 #ifdef SUPPORT_HARD_LINKS
 662   the_end:
 663 #endif
 664         strlcpy(lastname, fname, MAXPATHLEN);
 665
 666         if (S_ISREG(mode) || S_ISLNK(mode))
 667                 stats.total_size += F_LENGTH(file);
 668 }
 669
 670 static struct file_struct *recv_file_entry(int f, struct file_list *flist, int xflags)
 671 {
 672         static int64 modtime;
 673         static mode_t mode;
 674 #ifdef SUPPORT_HARD_LINKS
 675         static int64 dev;
 676 #endif
 677         static dev_t rdev;
 678         static uint32 rdev_major;
 679         static uid_t uid;
 680         static gid_t gid;
 681         static uint16 gid_flags;
 682         static char lastname[MAXPATHLEN], *lastdir;
 683         static int lastdir_depth, lastdir_len = -1;
 684         static unsigned int del_hier_name_len = 0;
 685         static int in_del_hier = 0;
 686         char thisname[MAXPATHLEN];
 687         unsigned int l1 = 0, l2 = 0;
 688         int alloc_len, basename_len, linkname_len;
 689         int extra_len = file_extra_cnt * EXTRA_LEN;
 690         int first_hlink_ndx = -1;
 691         int64 file_length;
 692         uint32 modtime_nsec;
 693         const char *basename;
 694         struct file_struct *file;
 695         alloc_pool_t *pool;
 696         char *bp;
 697
 698         if (xflags & XMIT_SAME_NAME)
 699                 l1 = read_byte(f);
 700
 701         if (xflags & XMIT_LONG_NAME)
 702                 l2 = read_varint30(f);
 703         else
 704                 l2 = read_byte(f);
 705
 706         if (l2 >= MAXPATHLEN - l1) {
 707                 rprintf(FERROR,
 708                         "overflow: xflags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 709                         xflags, l1, l2, lastname, who_am_i());
 710                 overflow_exit("recv_file_entry");
 711         }
 712
 713         strlcpy(thisname, lastname, l1 + 1);
 714         read_sbuf(f, &thisname[l1], l2);
 715         thisname[l1 + l2] = 0;
 716
 717         /* Abuse basename_len for a moment... */
 718         basename_len = strlcpy(lastname, thisname, MAXPATHLEN);
 719
 720 #ifdef ICONV_OPTION
 721         if (ic_recv != (iconv_t)-1) {
 722                 xbuf outbuf, inbuf;
 723
 724                 INIT_CONST_XBUF(outbuf, thisname);
 725                 INIT_XBUF(inbuf, lastname, basename_len, (size_t)-1);
 726
 727                 if (iconvbufs(ic_recv, &inbuf, &outbuf, ICB_INIT) < 0) {
 728                         io_error |= IOERR_GENERAL;
 729                         rprintf(FERROR_UTF8,
 730                             "[%s] cannot convert filename: %s (%s)\n",
 731                             who_am_i(), lastname, strerror(errno));
 732                         outbuf.len = 0;
 733                 }
 734                 thisname[outbuf.len] = '\0';
 735         }
 736 #endif
 737
 738         if (*thisname)
 739                 clean_fname(thisname, 0);
 740
 741         if (sanitize_paths)
 742                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
 743
 744         if ((basename = strrchr(thisname, '/')) != NULL) {
 745                 int len = basename++ - thisname;
 746                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 747                         lastdir = new_array(char, len + 1);
 748                         memcpy(lastdir, thisname, len);
 749                         lastdir[len] = '\0';
 750                         lastdir_len = len;
 751                         lastdir_depth = count_dir_elements(lastdir);
 752                 }
 753         } else
 754                 basename = thisname;
 755         basename_len = strlen(basename) + 1; /* count the '\0' */
 756
 757 #ifdef SUPPORT_HARD_LINKS
 758         if (protocol_version >= 30
 759          && BITS_SETnUNSET(xflags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 760                 first_hlink_ndx = read_varint(f);
 761                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->ndx_start + flist->used) {
 762                         rprintf(FERROR,
 763                                 "hard-link reference out of range: %d (%d)\n",
 764                                 first_hlink_ndx, flist->ndx_start + flist->used);
 765                         exit_cleanup(RERR_PROTOCOL);
 766                 }
 767                 if (DEBUG_GTE(HLINK, 1)) {
 768                         rprintf(FINFO, "[%s] #%d hard-links #%d (%sabbrev)\n",
 769                                 who_am_i(), flist->used+flist->ndx_start, first_hlink_ndx,
 770                                 first_hlink_ndx >= flist->ndx_start ? "" : "un");
 771                 }
 772                 if (first_hlink_ndx >= flist->ndx_start) {
 773                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
 774                         file_length = F_LENGTH(first);
 775                         modtime = first->modtime;
 776                         modtime_nsec = F_MOD_NSEC(first);
 777                         mode = first->mode;
 778                         if (preserve_uid)
 779                                 uid = F_OWNER(first);
 780                         if (preserve_gid)
 781                                 gid = F_GROUP(first);
 782                         if (preserve_devices && IS_DEVICE(mode)) {
 783                                 uint32 *devp = F_RDEV_P(first);
 784                                 rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 785                                 extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 786                         }
 787                         if (preserve_links && S_ISLNK(mode))
 788                                 linkname_len = strlen(F_SYMLINK(first)) + 1;
 789                         else
 790                                 linkname_len = 0;
 791                         goto create_object;
 792                 }
 793         }
 794 #endif
 795
 796         file_length = read_varlong30(f, 3);
 797         if (!(xflags & XMIT_SAME_TIME)) {
 798                 if (protocol_version >= 30) {
 799                         modtime = read_varlong(f, 4);
 800 #if SIZEOF_TIME_T < SIZEOF_INT64
 801                         if (!am_generator && (int64)(time_t)modtime != modtime) {
 802                                 rprintf(FERROR_XFER,
 803                                     "Time value of %s truncated on receiver.\n",
 804                                     lastname);
 805                         }
 806 #endif
 807                 } else
 808                         modtime = read_int(f);
 809         }
 810         if (xflags & XMIT_MOD_NSEC)
 811                 modtime_nsec = read_varint(f);
 812         else
 813                 modtime_nsec = 0;
 814         if (!(xflags & XMIT_SAME_MODE))
 815                 mode = from_wire_mode(read_int(f));
 816
 817         if (chmod_modes && !S_ISLNK(mode) && mode)
 818                 mode = tweak_mode(mode, chmod_modes);
 819
 820         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
 821                 if (protocol_version < 30)
 822                         uid = (uid_t)read_int(f);
 823                 else {
 824                         uid = (uid_t)read_varint(f);
 825                         if (xflags & XMIT_USER_NAME_FOLLOWS)
 826                                 uid = recv_user_name(f, uid);
 827                         else if (inc_recurse && am_root && (!numeric_ids || usermap))
 828                                 uid = match_uid(uid);
 829                 }
 830         }
 831         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
 832                 if (protocol_version < 30)
 833                         gid = (gid_t)read_int(f);
 834                 else {
 835                         gid = (gid_t)read_varint(f);
 836                         gid_flags = 0;
 837                         if (xflags & XMIT_GROUP_NAME_FOLLOWS)
 838                                 gid = recv_group_name(f, gid, &gid_flags);
 839                         else if (inc_recurse && (!am_root || !numeric_ids || groupmap))
 840                                 gid = match_gid(gid, &gid_flags);
 841                 }
 842         }
 843
 844         if ((preserve_devices && IS_DEVICE(mode))
 845          || (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31)) {
 846                 if (protocol_version < 28) {
 847                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 848                                 rdev = (dev_t)read_int(f);
 849                 } else {
 850                         uint32 rdev_minor;
 851                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 852                                 rdev_major = read_varint30(f);
 853                         if (protocol_version >= 30)
 854                                 rdev_minor = read_varint(f);
 855                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 856                                 rdev_minor = read_byte(f);
 857                         else
 858                                 rdev_minor = read_int(f);
 859                         rdev = MAKEDEV(rdev_major, rdev_minor);
 860                 }
 861                 if (IS_DEVICE(mode))
 862                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 863                 file_length = 0;
 864         } else if (protocol_version < 28)
 865                 rdev = MAKEDEV(0, 0);
 866
 867 #ifdef SUPPORT_LINKS
 868         if (preserve_links && S_ISLNK(mode)) {
 869                 linkname_len = read_varint30(f) + 1; /* count the '\0' */
 870                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 871                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 872                                 linkname_len - 1);
 873                         overflow_exit("recv_file_entry");
 874                 }
 875 #ifdef ICONV_OPTION
 876                 /* We don't know how much extra room we need to convert
 877                  * the as-yet-unread symlink data, so let's hope that a
 878                  * double-size buffer is plenty. */
 879                 if (sender_symlink_iconv)
 880                         linkname_len *= 2;
 881 #endif
 882                 if (munge_symlinks)
 883                         linkname_len += SYMLINK_PREFIX_LEN;
 884         }
 885         else
 886 #endif
 887                 linkname_len = 0;
 888
 889 #ifdef SUPPORT_HARD_LINKS
 890   create_object:
 891         if (preserve_hard_links) {
 892                 if (protocol_version < 28 && S_ISREG(mode))
 893                         xflags |= XMIT_HLINKED;
 894                 if (xflags & XMIT_HLINKED)
 895                         extra_len += (inc_recurse+1) * EXTRA_LEN;
 896         }
 897 #endif
 898
 899 #ifdef SUPPORT_ACLS
 900         /* Directories need an extra int32 for the default ACL. */
 901         if (preserve_acls && S_ISDIR(mode))
 902                 extra_len += EXTRA_LEN;
 903 #endif
 904
 905         if (always_checksum && S_ISREG(mode))
 906                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 907
 908 #if SIZEOF_INT64 >= 8
 909         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 910                 extra_len += EXTRA_LEN;
 911 #endif
 912 #ifdef HAVE_UTIMENSAT
 913         if (modtime_nsec)
 914                 extra_len += EXTRA_LEN;
 915 #endif
 916         if (file_length < 0) {
 917                 rprintf(FERROR, "Offset underflow: file-length is negative\n");
 918                 exit_cleanup(RERR_UNSUPPORTED);
 919         }
 920
 921         if (inc_recurse && S_ISDIR(mode)) {
 922                 if (one_file_system) {
 923                         /* Room to save the dir's device for -x */
 924                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 925                 }
 926                 pool = dir_flist->file_pool;
 927         } else
 928                 pool = flist->file_pool;
 929
 930 #if EXTRA_ROUNDING > 0
 931         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 932                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 933 #endif
 934
 935         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 936                   + linkname_len;
 937         bp = pool_alloc(pool, alloc_len, "recv_file_entry");
 938
 939         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 940         bp += extra_len;
 941         file = (struct file_struct *)bp;
 942         bp += FILE_STRUCT_LEN;
 943
 944         memcpy(bp, basename, basename_len);
 945
 946 #ifdef SUPPORT_HARD_LINKS
 947         if (xflags & XMIT_HLINKED)
 948                 file->flags |= FLAG_HLINKED;
 949 #endif
 950         file->modtime = (time_t)modtime;
 951 #ifdef HAVE_UTIMENSAT
 952         if (modtime_nsec) {
 953                 file->flags |= FLAG_MOD_NSEC;
 954                 OPT_EXTRA(file, 0)->unum = modtime_nsec;
 955         }
 956 #endif
 957         file->len32 = (uint32)file_length;
 958 #if SIZEOF_INT64 >= 8
 959         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 960 #if SIZEOF_CAPITAL_OFF_T < 8
 961                 rprintf(FERROR, "Offset overflow: attempted 64-bit file-length\n");
 962                 exit_cleanup(RERR_UNSUPPORTED);
 963 #else
 964                 file->flags |= FLAG_LENGTH64;
 965                 OPT_EXTRA(file, NSEC_BUMP(file))->unum = (uint32)(file_length >> 32);
 966 #endif
 967         }
 968 #endif
 969         file->mode = mode;
 970         if (preserve_uid)
 971                 F_OWNER(file) = uid;
 972         if (preserve_gid) {
 973                 F_GROUP(file) = gid;
 974                 file->flags |= gid_flags;
 975         }
 976         if (unsort_ndx)
 977                 F_NDX(file) = flist->used + flist->ndx_start;
 978
 979         if (basename != thisname) {
 980                 file->dirname = lastdir;
 981                 F_DEPTH(file) = lastdir_depth + 1;
 982         } else
 983                 F_DEPTH(file) = 1;
 984
 985         if (S_ISDIR(mode)) {
 986                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 987                         F_DEPTH(file)--;
 988                 if (protocol_version >= 30) {
 989                         if (!(xflags & XMIT_NO_CONTENT_DIR)) {
 990                                 if (xflags & XMIT_TOP_DIR)
 991                                         file->flags |= FLAG_TOP_DIR;
 992                                 file->flags |= FLAG_CONTENT_DIR;
 993                         } else if (xflags & XMIT_TOP_DIR)
 994                                 file->flags |= FLAG_IMPLIED_DIR;
 995                 } else if (xflags & XMIT_TOP_DIR) {
 996                         in_del_hier = recurse;
 997                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
 998                         if (relative_paths && del_hier_name_len > 2
 999                             && lastname[del_hier_name_len-1] == '.'
1000                             && lastname[del_hier_name_len-2] == '/')
1001                                 del_hier_name_len -= 2;
1002                         file->flags |= FLAG_TOP_DIR | FLAG_CONTENT_DIR;
1003                 } else if (in_del_hier) {
1004                         if (!relative_paths || !del_hier_name_len
1005                          || (l1 >= del_hier_name_len
1006                           && lastname[del_hier_name_len] == '/'))
1007                                 file->flags |= FLAG_CONTENT_DIR;
1008                         else
1009                                 in_del_hier = 0;
1010                 }
1011         }
1012
1013         if (preserve_devices && IS_DEVICE(mode)) {
1014                 uint32 *devp = F_RDEV_P(file);
1015                 DEV_MAJOR(devp) = major(rdev);
1016                 DEV_MINOR(devp) = minor(rdev);
1017         }
1018
1019 #ifdef SUPPORT_LINKS
1020         if (linkname_len) {
1021                 bp += basename_len;
1022                 if (first_hlink_ndx >= flist->ndx_start) {
1023                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
1024                         memcpy(bp, F_SYMLINK(first), linkname_len);
1025                 } else {
1026                         if (munge_symlinks) {
1027                                 strlcpy(bp, SYMLINK_PREFIX, linkname_len);
1028                                 bp += SYMLINK_PREFIX_LEN;
1029                                 linkname_len -= SYMLINK_PREFIX_LEN;
1030                         }
1031 #ifdef ICONV_OPTION
1032                         if (sender_symlink_iconv) {
1033                                 xbuf outbuf, inbuf;
1034
1035                                 alloc_len = linkname_len;
1036                                 linkname_len /= 2;
1037
1038                                 /* Read the symlink data into the end of our double-sized
1039                                  * buffer and then convert it into the right spot. */
1040                                 INIT_XBUF(inbuf, bp + alloc_len - linkname_len,
1041                                           linkname_len - 1, (size_t)-1);
1042                                 read_sbuf(f, inbuf.buf, inbuf.len);
1043                                 INIT_XBUF(outbuf, bp, 0, alloc_len);
1044
1045                                 if (iconvbufs(ic_recv, &inbuf, &outbuf, ICB_INIT) < 0) {
1046                                         io_error |= IOERR_GENERAL;
1047                                         rprintf(FERROR_XFER,
1048                                             "[%s] cannot convert symlink data for: %s (%s)\n",
1049                                             who_am_i(), full_fname(thisname), strerror(errno));
1050                                         bp = (char*)file->basename;
1051                                         *bp++ = '\0';
1052                                         outbuf.len = 0;
1053                                 }
1054                                 bp[outbuf.len] = '\0';
1055                         } else
1056 #endif
1057                                 read_sbuf(f, bp, linkname_len - 1);
1058                         if (sanitize_paths && !munge_symlinks && *bp)
1059                                 sanitize_path(bp, bp, "", lastdir_depth, SP_DEFAULT);
1060                 }
1061         }
1062 #endif
1063
1064 #ifdef SUPPORT_HARD_LINKS
1065         if (preserve_hard_links && xflags & XMIT_HLINKED) {
1066                 if (protocol_version >= 30) {
1067                         if (xflags & XMIT_HLINK_FIRST) {
1068                                 F_HL_GNUM(file) = flist->ndx_start + flist->used;
1069                         } else
1070                                 F_HL_GNUM(file) = first_hlink_ndx;
1071                 } else {
1072                         static int32 cnt = 0;
1073                         struct ht_int64_node *np;
1074                         int64 ino;
1075                         int32 ndx;
1076                         if (protocol_version < 26) {
1077                                 dev = read_int(f);
1078                                 ino = read_int(f);
1079                         } else {
1080                                 if (!(xflags & XMIT_SAME_DEV_pre30))
1081                                         dev = read_longint(f);
1082                                 ino = read_longint(f);
1083                         }
1084                         np = idev_find(dev, ino);
1085                         ndx = (int32)(long)np->data - 1;
1086                         if (ndx < 0) {
1087                                 ndx = cnt++;
1088                                 np->data = (void*)(long)cnt;
1089                         }
1090                         F_HL_GNUM(file) = ndx;
1091                 }
1092         }
1093 #endif
1094
1095         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
1096                 if (S_ISREG(mode))
1097                         bp = F_SUM(file);
1098                 else {
1099                         /* Prior to 28, we get a useless set of nulls. */
1100                         bp = tmp_sum;
1101                 }
1102                 if (first_hlink_ndx >= flist->ndx_start) {
1103                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
1104                         memcpy(bp, F_SUM(first), checksum_len);
1105                 } else
1106                         read_buf(f, bp, checksum_len);
1107         }
1108
1109 #ifdef SUPPORT_ACLS
1110         if (preserve_acls && !S_ISLNK(mode))
1111                 receive_acl(f, file);
1112 #endif
1113 #ifdef SUPPORT_XATTRS
1114         if (preserve_xattrs)
1115                 receive_xattr(f, file);
1116 #endif
1117
1118         if (S_ISREG(mode) || S_ISLNK(mode))
1119                 stats.total_size += file_length;
1120
1121         return file;
1122 }
1123
1124 /* Create a file_struct for a named file by reading its stat() information
1125  * and performing extensive checks against global options.
1126  *
1127  * Returns a pointer to the new file struct, or NULL if there was an error
1128  * or this file should be excluded.
1129  *
1130  * Note: Any error (here or in send_file_name) that results in the omission of
1131  * an existent source file from the file list should set
1132  * "io_error |= IOERR_GENERAL" to avoid deletion of the file from the
1133  * destination if --delete is on. */
1134 struct file_struct *make_file(const char *fname, struct file_list *flist,
1135                               STRUCT_STAT *stp, int flags, int filter_level)
1136 {
1137         static char *lastdir;
1138         static int lastdir_len = -1;
1139         struct file_struct *file;
1140         char thisname[MAXPATHLEN];
1141         char linkname[MAXPATHLEN];
1142         int alloc_len, basename_len, linkname_len;
1143         int extra_len = file_extra_cnt * EXTRA_LEN;
1144         const char *basename;
1145         alloc_pool_t *pool;
1146         STRUCT_STAT st;
1147         char *bp;
1148
1149         if (strlcpy(thisname, fname, sizeof thisname) >= sizeof thisname) {
1150                 io_error |= IOERR_GENERAL;
1151                 rprintf(FERROR_XFER, "skipping overly long name: %s\n", fname);
1152                 return NULL;
1153         }
1154         clean_fname(thisname, 0);
1155         if (sanitize_paths)
1156                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
1157
1158         if (stp && (S_ISDIR(stp->st_mode) || stp->st_mode == 0)) {
1159                 /* This is needed to handle a "symlink/." with a --relative
1160                  * dir, or a request to delete a specific file. */
1161                 st = *stp;
1162                 *linkname = '\0'; /* make IBM code checker happy */
1163         } else if (readlink_stat(thisname, &st, linkname) != 0) {
1164                 int save_errno = errno;
1165                 /* See if file is excluded before reporting an error. */
1166                 if (filter_level != NO_FILTERS
1167                  && (is_excluded(thisname, 0, filter_level)
1168                   || is_excluded(thisname, 1, filter_level))) {
1169                         if (ignore_perishable && save_errno != ENOENT)
1170                                 non_perishable_cnt++;
1171                         return NULL;
1172                 }
1173                 if (save_errno == ENOENT) {
1174 #ifdef SUPPORT_LINKS
1175                         /* When our options tell us to follow a symlink that
1176                          * points nowhere, tell the user about the symlink
1177                          * instead of giving a "vanished" message.  We only
1178                          * dereference a symlink if one of the --copy*links
1179                          * options was specified, so there's no need for the
1180                          * extra lstat() if one of these options isn't on. */
1181                         if ((copy_links || copy_unsafe_links || copy_dirlinks)
1182                          && x_lstat(thisname, &st, NULL) == 0
1183                          && S_ISLNK(st.st_mode)) {
1184                                 io_error |= IOERR_GENERAL;
1185                                 rprintf(FERROR_XFER, "symlink has no referent: %s\n",
1186                                         full_fname(thisname));
1187                         } else
1188 #endif
1189                         {
1190                                 enum logcode c = am_daemon && protocol_version < 28
1191                                                ? FERROR : FWARNING;
1192                                 io_error |= IOERR_VANISHED;
1193                                 rprintf(c, "file has vanished: %s\n",
1194                                         full_fname(thisname));
1195                         }
1196                 } else {
1197                         io_error |= IOERR_GENERAL;
1198                         rsyserr(FERROR_XFER, save_errno, "readlink_stat(%s) failed",
1199                                 full_fname(thisname));
1200                 }
1201                 return NULL;
1202         } else if (st.st_mode == 0) {
1203                 io_error |= IOERR_GENERAL;
1204                 rprintf(FINFO, "skipping file with bogus (zero) st_mode: %s\n",
1205                         full_fname(thisname));
1206                 return NULL;
1207         }
1208
1209         if (filter_level == NO_FILTERS)
1210                 goto skip_filters;
1211
1212         if (S_ISDIR(st.st_mode)) {
1213                 if (!xfer_dirs) {
1214                         rprintf(FINFO, "skipping directory %s\n", thisname);
1215                         return NULL;
1216                 }
1217                 /* -x only affects dirs because we need to avoid recursing
1218                  * into a mount-point directory, not to avoid copying a
1219                  * symlinked file if -L (or similar) was specified. */
1220                 if (one_file_system && st.st_dev != filesystem_dev
1221                  && BITS_SETnUNSET(flags, FLAG_CONTENT_DIR, FLAG_TOP_DIR)) {
1222                         if (one_file_system > 1) {
1223                                 if (INFO_GTE(MOUNT, 1)) {
1224                                         rprintf(FINFO,
1225                                             "[%s] skipping mount-point dir %s\n",
1226                                             who_am_i(), thisname);
1227                                 }
1228                                 return NULL;
1229                         }
1230                         flags |= FLAG_MOUNT_DIR;
1231                         flags &= ~FLAG_CONTENT_DIR;
1232                 }
1233         } else
1234                 flags &= ~FLAG_CONTENT_DIR;
1235
1236         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
1237                 if (ignore_perishable)
1238                         non_perishable_cnt++;
1239                 return NULL;
1240         }
1241
1242         if (lp_ignore_nonreadable(module_id)) {
1243 #ifdef SUPPORT_LINKS
1244                 if (!S_ISLNK(st.st_mode))
1245 #endif
1246                         if (access(thisname, R_OK) != 0)
1247                                 return NULL;
1248         }
1249
1250   skip_filters:
1251
1252         /* Only divert a directory in the main transfer. */
1253         if (flist) {
1254                 if (flist->prev && S_ISDIR(st.st_mode)
1255                  && flags & FLAG_DIVERT_DIRS) {
1256                         /* Room for parent/sibling/next-child info. */
1257                         extra_len += DIRNODE_EXTRA_CNT * EXTRA_LEN;
1258                         if (relative_paths)
1259                                 extra_len += PTR_EXTRA_CNT * EXTRA_LEN;
1260                         pool = dir_flist->file_pool;
1261                 } else
1262                         pool = flist->file_pool;
1263         } else {
1264 #ifdef SUPPORT_ACLS
1265                 /* Directories need an extra int32 for the default ACL. */
1266                 if (preserve_acls && S_ISDIR(st.st_mode))
1267                         extra_len += EXTRA_LEN;
1268 #endif
1269                 pool = NULL;
1270         }
1271
1272         if (DEBUG_GTE(FLIST, 2)) {
1273                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1274                         who_am_i(), thisname, filter_level);
1275         }
1276
1277         if ((basename = strrchr(thisname, '/')) != NULL) {
1278                 int len = basename++ - thisname;
1279                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1280                         lastdir = new_array(char, len + 1);
1281                         memcpy(lastdir, thisname, len);
1282                         lastdir[len] = '\0';
1283                         lastdir_len = len;
1284                 }
1285         } else
1286                 basename = thisname;
1287         basename_len = strlen(basename) + 1; /* count the '\0' */
1288
1289 #ifdef SUPPORT_LINKS
1290         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1291 #else
1292         linkname_len = 0;
1293 #endif
1294
1295 #ifdef ST_MTIME_NSEC
1296         if (st.ST_MTIME_NSEC && protocol_version >= 31)
1297                 extra_len += EXTRA_LEN;
1298 #endif
1299 #if SIZEOF_CAPITAL_OFF_T >= 8
1300         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1301                 extra_len += EXTRA_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                 if (sender_keeps_checksum)
1307                         extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
1308         }
1309
1310 #if EXTRA_ROUNDING > 0
1311         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1312                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1313 #endif
1314
1315         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1316                   + linkname_len;
1317         if (pool)
1318                 bp = pool_alloc(pool, alloc_len, "make_file");
1319         else {
1320                 if (!(bp = new_array(char, alloc_len)))
1321                         out_of_memory("make_file");
1322         }
1323
1324         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1325         bp += extra_len;
1326         file = (struct file_struct *)bp;
1327         bp += FILE_STRUCT_LEN;
1328
1329         memcpy(bp, basename, basename_len);
1330
1331 #ifdef SUPPORT_HARD_LINKS
1332         if (preserve_hard_links && flist && flist->prev) {
1333                 if (protocol_version >= 28
1334                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1335                  : S_ISREG(st.st_mode)) {
1336                         tmp_dev = (int64)st.st_dev;
1337                         tmp_ino = (int64)st.st_ino;
1338                 } else
1339                         tmp_dev = -1;
1340         }
1341 #endif
1342
1343 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1344         if (IS_DEVICE(st.st_mode)) {
1345                 tmp_rdev = st.st_rdev;
1346                 st.st_size = 0;
1347         } else if (IS_SPECIAL(st.st_mode))
1348                 st.st_size = 0;
1349 #endif
1350
1351         file->flags = flags;
1352         file->modtime = st.st_mtime;
1353 #ifdef ST_MTIME_NSEC
1354         if (st.ST_MTIME_NSEC && protocol_version >= 31) {
1355                 file->flags |= FLAG_MOD_NSEC;
1356                 OPT_EXTRA(file, 0)->unum = st.ST_MTIME_NSEC;
1357         }
1358 #endif
1359         file->len32 = (uint32)st.st_size;
1360 #if SIZEOF_CAPITAL_OFF_T >= 8
1361         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1362                 file->flags |= FLAG_LENGTH64;
1363                 OPT_EXTRA(file, NSEC_BUMP(file))->unum = (uint32)(st.st_size >> 32);
1364         }
1365 #endif
1366         file->mode = st.st_mode;
1367         if (preserve_uid)
1368                 F_OWNER(file) = st.st_uid;
1369         if (preserve_gid)
1370                 F_GROUP(file) = st.st_gid;
1371         if (am_generator && st.st_uid == our_uid)
1372                 file->flags |= FLAG_OWNED_BY_US;
1373
1374         if (basename != thisname)
1375                 file->dirname = lastdir;
1376
1377 #ifdef SUPPORT_LINKS
1378         if (linkname_len)
1379                 memcpy(bp + basename_len, linkname, linkname_len);
1380 #endif
1381
1382         if (am_sender)
1383                 F_PATHNAME(file) = pathname;
1384         else if (!pool)
1385                 F_DEPTH(file) = extra_len / EXTRA_LEN;
1386
1387         if (basename_len == 0+1) {
1388                 if (!pool)
1389                         unmake_file(file);
1390                 return NULL;
1391         }
1392
1393         if (sender_keeps_checksum && S_ISREG(st.st_mode))
1394                 memcpy(F_SUM(file), tmp_sum, checksum_len);
1395
1396         if (unsort_ndx)
1397                 F_NDX(file) = stats.num_dirs;
1398
1399         return file;
1400 }
1401
1402 /* Only called for temporary file_struct entries created by make_file(). */
1403 void unmake_file(struct file_struct *file)
1404 {
1405         free(REQ_EXTRA(file, F_DEPTH(file)));
1406 }
1407
1408 static struct file_struct *send_file_name(int f, struct file_list *flist,
1409                                           const char *fname, STRUCT_STAT *stp,
1410                                           int flags, int filter_level)
1411 {
1412         struct file_struct *file;
1413
1414         file = make_file(fname, flist, stp, flags, filter_level);
1415         if (!file)
1416                 return NULL;
1417
1418         if (chmod_modes && !S_ISLNK(file->mode) && file->mode)
1419                 file->mode = tweak_mode(file->mode, chmod_modes);
1420
1421         if (f >= 0) {
1422                 char fbuf[MAXPATHLEN];
1423 #ifdef SUPPORT_LINKS
1424                 const char *symlink_name;
1425                 int symlink_len;
1426 #ifdef ICONV_OPTION
1427                 char symlink_buf[MAXPATHLEN];
1428 #endif
1429 #endif
1430 #if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
1431                 stat_x sx;
1432                 init_stat_x(&sx);
1433 #endif
1434
1435 #ifdef SUPPORT_LINKS
1436                 if (preserve_links && S_ISLNK(file->mode)) {
1437                         symlink_name = F_SYMLINK(file);
1438                         symlink_len = strlen(symlink_name);
1439                         if (symlink_len == 0) {
1440                                 io_error |= IOERR_GENERAL;
1441                                 f_name(file, fbuf);
1442                                 rprintf(FERROR_XFER,
1443                                     "skipping symlink with 0-length value: %s\n",
1444                                     full_fname(fbuf));
1445                                 return NULL;
1446                         }
1447                 } else {
1448                         symlink_name = NULL;
1449                         symlink_len = 0;
1450                 }
1451 #endif
1452
1453 #ifdef ICONV_OPTION
1454                 if (ic_send != (iconv_t)-1) {
1455                         xbuf outbuf, inbuf;
1456
1457                         INIT_CONST_XBUF(outbuf, fbuf);
1458
1459                         if (file->dirname) {
1460                                 INIT_XBUF_STRLEN(inbuf, (char*)file->dirname);
1461                                 outbuf.size -= 2; /* Reserve room for '/' & 1 more char. */
1462                                 if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0)
1463                                         goto convert_error;
1464                                 outbuf.size += 2;
1465                                 fbuf[outbuf.len++] = '/';
1466                         }
1467
1468                         INIT_XBUF_STRLEN(inbuf, (char*)file->basename);
1469                         if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0) {
1470                           convert_error:
1471                                 io_error |= IOERR_GENERAL;
1472                                 rprintf(FERROR_XFER,
1473                                     "[%s] cannot convert filename: %s (%s)\n",
1474                                     who_am_i(), f_name(file, fbuf), strerror(errno));
1475                                 return NULL;
1476                         }
1477                         fbuf[outbuf.len] = '\0';
1478
1479 #ifdef SUPPORT_LINKS
1480                         if (symlink_len && sender_symlink_iconv) {
1481                                 INIT_XBUF(inbuf, (char*)symlink_name, symlink_len, (size_t)-1);
1482                                 INIT_CONST_XBUF(outbuf, symlink_buf);
1483                                 if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0) {
1484                                         io_error |= IOERR_GENERAL;
1485                                         f_name(file, fbuf);
1486                                         rprintf(FERROR_XFER,
1487                                             "[%s] cannot convert symlink data for: %s (%s)\n",
1488                                             who_am_i(), full_fname(fbuf), strerror(errno));
1489                                         return NULL;
1490                                 }
1491                                 symlink_buf[outbuf.len] = '\0';
1492
1493                                 symlink_name = symlink_buf;
1494                                 symlink_len = outbuf.len;
1495                         }
1496 #endif
1497                 } else
1498 #endif
1499                         f_name(file, fbuf);
1500
1501 #ifdef SUPPORT_ACLS
1502                 if (preserve_acls && !S_ISLNK(file->mode)) {
1503                         sx.st.st_mode = file->mode;
1504                         if (get_acl(fname, &sx) < 0) {
1505                                 io_error |= IOERR_GENERAL;
1506                                 return NULL;
1507                         }
1508                 }
1509 #endif
1510 #ifdef SUPPORT_XATTRS
1511                 if (preserve_xattrs) {
1512                         sx.st.st_mode = file->mode;
1513                         if (get_xattr(fname, &sx) < 0) {
1514                                 io_error |= IOERR_GENERAL;
1515                                 return NULL;
1516                         }
1517                 }
1518 #endif
1519
1520                 send_file_entry(f, fbuf, file,
1521 #ifdef SUPPORT_LINKS
1522                                 symlink_name, symlink_len,
1523 #endif
1524                                 flist->used, flist->ndx_start);
1525
1526 #ifdef SUPPORT_ACLS
1527                 if (preserve_acls && !S_ISLNK(file->mode)) {
1528                         send_acl(f, &sx);
1529                         free_acl(&sx);
1530                 }
1531 #endif
1532 #ifdef SUPPORT_XATTRS
1533                 if (preserve_xattrs) {
1534                         F_XATTR(file) = send_xattr(f, &sx);
1535                         free_xattr(&sx);
1536                 }
1537 #endif
1538         }
1539
1540         maybe_emit_filelist_progress(flist->used + flist_count_offset);
1541
1542         flist_expand(flist, 1);
1543         flist->files[flist->used++] = file;
1544
1545         return file;
1546 }
1547
1548 static void send_if_directory(int f, struct file_list *flist,
1549                               struct file_struct *file,
1550                               char *fbuf, unsigned int ol,
1551                               int flags)
1552 {
1553         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1554
1555         if (S_ISDIR(file->mode)
1556             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1557                 void *save_filters;
1558                 unsigned int len = strlen(fbuf);
1559                 if (len > 1 && fbuf[len-1] == '/')
1560                         fbuf[--len] = '\0';
1561                 save_filters = push_local_filters(fbuf, len);
1562                 send_directory(f, flist, fbuf, len, flags);
1563                 pop_local_filters(save_filters);
1564                 fbuf[ol] = '\0';
1565                 if (is_dot_dir)
1566                         fbuf[ol-1] = '.';
1567         }
1568 }
1569
1570 static int file_compare(const void *file1, const void *file2)
1571 {
1572         return f_name_cmp(*(struct file_struct **)file1,
1573                           *(struct file_struct **)file2);
1574 }
1575
1576 /* The guts of a merge-sort algorithm.  This was derived from the glibc
1577  * version, but I (Wayne) changed the merge code to do less copying and
1578  * to require only half the amount of temporary memory. */
1579 static void fsort_tmp(struct file_struct **fp, size_t num,
1580                       struct file_struct **tmp)
1581 {
1582         struct file_struct **f1, **f2, **t;
1583         size_t n1, n2;
1584
1585         n1 = num / 2;
1586         n2 = num - n1;
1587         f1 = fp;
1588         f2 = fp + n1;
1589
1590         if (n1 > 1)
1591                 fsort_tmp(f1, n1, tmp);
1592         if (n2 > 1)
1593                 fsort_tmp(f2, n2, tmp);
1594
1595         while (f_name_cmp(*f1, *f2) <= 0) {
1596                 if (!--n1)
1597                         return;
1598                 f1++;
1599         }
1600
1601         t = tmp;
1602         memcpy(t, f1, n1 * PTR_SIZE);
1603
1604         *f1++ = *f2++, n2--;
1605
1606         while (n1 > 0 && n2 > 0) {
1607                 if (f_name_cmp(*t, *f2) <= 0)
1608                         *f1++ = *t++, n1--;
1609                 else
1610                         *f1++ = *f2++, n2--;
1611         }
1612
1613         if (n1 > 0)
1614                 memcpy(f1, t, n1 * PTR_SIZE);
1615 }
1616
1617 /* This file-struct sorting routine makes sure that any identical names in
1618  * the file list stay in the same order as they were in the original list.
1619  * This is particularly vital in inc_recurse mode where we expect a sort
1620  * on the flist to match the exact order of a sort on the dir_flist. */
1621 static void fsort(struct file_struct **fp, size_t num)
1622 {
1623         if (num <= 1)
1624                 return;
1625
1626         if (use_qsort)
1627                 qsort(fp, num, PTR_SIZE, file_compare);
1628         else {
1629                 struct file_struct **tmp = new_array(struct file_struct *,
1630                                                      (num+1) / 2);
1631                 fsort_tmp(fp, num, tmp);
1632                 free(tmp);
1633         }
1634 }
1635
1636 /* We take an entire set of sibling dirs from the sorted flist and link them
1637  * into the tree, setting the appropriate parent/child/sibling pointers. */
1638 static void add_dirs_to_tree(int parent_ndx, struct file_list *from_flist,
1639                              int dir_cnt)
1640 {
1641         int i;
1642         int32 *dp = NULL;
1643         int32 *parent_dp = parent_ndx < 0 ? NULL
1644                          : F_DIR_NODE_P(dir_flist->sorted[parent_ndx]);
1645
1646         flist_expand(dir_flist, dir_cnt);
1647         dir_flist->sorted = dir_flist->files;
1648
1649         for (i = 0; dir_cnt; i++) {
1650                 struct file_struct *file = from_flist->sorted[i];
1651
1652                 if (!S_ISDIR(file->mode))
1653                         continue;
1654
1655                 dir_flist->files[dir_flist->used++] = file;
1656                 dir_cnt--;
1657
1658                 if (file->basename[0] == '.' && file->basename[1] == '\0')
1659                         continue;
1660
1661                 if (dp)
1662                         DIR_NEXT_SIBLING(dp) = dir_flist->used - 1;
1663                 else if (parent_dp)
1664                         DIR_FIRST_CHILD(parent_dp) = dir_flist->used - 1;
1665                 else
1666                         send_dir_ndx = dir_flist->used - 1;
1667
1668                 dp = F_DIR_NODE_P(file);
1669                 DIR_PARENT(dp) = parent_ndx;
1670                 DIR_FIRST_CHILD(dp) = -1;
1671         }
1672         if (dp)
1673                 DIR_NEXT_SIBLING(dp) = -1;
1674 }
1675
1676 static void interpret_stat_error(const char *fname, int is_dir)
1677 {
1678         if (errno == ENOENT) {
1679                 io_error |= IOERR_VANISHED;
1680                 rprintf(FWARNING, "%s has vanished: %s\n",
1681                         is_dir ? "directory" : "file", full_fname(fname));
1682         } else {
1683                 io_error |= IOERR_GENERAL;
1684                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
1685                         full_fname(fname));
1686         }
1687 }
1688
1689 /* This function is normally called by the sender, but the receiving side also
1690  * calls it from get_dirlist() with f set to -1 so that we just construct the
1691  * file list in memory without sending it over the wire.  Also, get_dirlist()
1692  * might call this with f set to -2, which also indicates that local filter
1693  * rules should be ignored. */
1694 static void send_directory(int f, struct file_list *flist, char *fbuf, int len,
1695                            int flags)
1696 {
1697         struct dirent *di;
1698         unsigned remainder;
1699         char *p;
1700         DIR *d;
1701         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1702         int start = flist->used;
1703         int filter_level = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1704
1705         assert(flist != NULL);
1706
1707         if (!(d = opendir(fbuf))) {
1708                 if (errno == ENOENT) {
1709                         if (am_sender) /* Can abuse this for vanished error w/ENOENT: */
1710                                 interpret_stat_error(fbuf, True);
1711                         return;
1712                 }
1713                 io_error |= IOERR_GENERAL;
1714                 rsyserr(FERROR_XFER, errno, "opendir %s failed", full_fname(fbuf));
1715                 return;
1716         }
1717
1718         p = fbuf + len;
1719         if (len == 1 && *fbuf == '/')
1720                 remainder = MAXPATHLEN - 1;
1721         else if (len < MAXPATHLEN-1) {
1722                 *p++ = '/';
1723                 *p = '\0';
1724                 remainder = MAXPATHLEN - (len + 1);
1725         } else
1726                 remainder = 0;
1727
1728         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1729                 unsigned name_len;
1730                 char *dname = d_name(di);
1731                 if (dname[0] == '.' && (dname[1] == '\0'
1732                     || (dname[1] == '.' && dname[2] == '\0')))
1733                         continue;
1734                 name_len = strlcpy(p, dname, remainder);
1735                 if (name_len >= remainder) {
1736                         char save = fbuf[len];
1737                         fbuf[len] = '\0';
1738                         io_error |= IOERR_GENERAL;
1739                         rprintf(FERROR_XFER,
1740                                 "filename overflows max-path len by %u: %s/%s\n",
1741                                 name_len - remainder + 1, fbuf, dname);
1742                         fbuf[len] = save;
1743                         continue;
1744                 }
1745                 if (dname[0] == '\0') {
1746                         io_error |= IOERR_GENERAL;
1747                         rprintf(FERROR_XFER,
1748                                 "cannot send file with empty name in %s\n",
1749                                 full_fname(fbuf));
1750                         continue;
1751                 }
1752
1753                 send_file_name(f, flist, fbuf, NULL, flags, filter_level);
1754         }
1755
1756         fbuf[len] = '\0';
1757
1758         if (errno) {
1759                 io_error |= IOERR_GENERAL;
1760                 rsyserr(FERROR_XFER, errno, "readdir(%s)", full_fname(fbuf));
1761         }
1762
1763         closedir(d);
1764
1765         if (f >= 0 && recurse && !divert_dirs) {
1766                 int i, end = flist->used - 1;
1767                 /* send_if_directory() bumps flist->used, so use "end". */
1768                 for (i = start; i <= end; i++)
1769                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1770         }
1771 }
1772
1773 static void send_implied_dirs(int f, struct file_list *flist, char *fname,
1774                               char *start, char *limit, int flags, char name_type)
1775 {
1776         static char lastpath[MAXPATHLEN] = "";
1777         static int lastpath_len = 0;
1778         static struct file_struct *lastpath_struct = NULL;
1779         struct file_struct *file;
1780         item_list *relname_list;
1781         relnamecache **rnpp;
1782         int len, need_new_dir, depth = 0;
1783         filter_rule_list save_filter_list = filter_list;
1784
1785         flags = (flags | FLAG_IMPLIED_DIR) & ~(FLAG_TOP_DIR | FLAG_CONTENT_DIR);
1786         filter_list.head = filter_list.tail = NULL; /* Don't filter implied dirs. */
1787
1788         if (inc_recurse) {
1789                 if (lastpath_struct && F_PATHNAME(lastpath_struct) == pathname
1790                  && lastpath_len == limit - fname
1791                  && strncmp(lastpath, fname, lastpath_len) == 0)
1792                         need_new_dir = 0;
1793                 else
1794                         need_new_dir = 1;
1795         } else {
1796                 char *tp = fname, *lp = lastpath;
1797                 /* Skip any initial directories in our path that we
1798                  * have in common with lastpath. */
1799                 assert(start == fname);
1800                 for ( ; ; tp++, lp++) {
1801                         if (tp == limit) {
1802                                 if (*lp == '/' || *lp == '\0')
1803                                         goto done;
1804                                 break;
1805                         }
1806                         if (*lp != *tp)
1807                                 break;
1808                         if (*tp == '/') {
1809                                 start = tp;
1810                                 depth++;
1811                         }
1812                 }
1813                 need_new_dir = 1;
1814         }
1815
1816         if (need_new_dir) {
1817                 int save_copy_links = copy_links;
1818                 int save_xfer_dirs = xfer_dirs;
1819                 char *slash;
1820
1821                 copy_links = xfer_dirs = 1;
1822
1823                 *limit = '\0';
1824
1825                 for (slash = start; (slash = strchr(slash+1, '/')) != NULL; ) {
1826                         *slash = '\0';
1827                         file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1828                         depth++;
1829                         if (!inc_recurse && file && S_ISDIR(file->mode))
1830                                 change_local_filter_dir(fname, strlen(fname), depth);
1831                         *slash = '/';
1832                 }
1833
1834                 file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1835                 if (inc_recurse) {
1836                         if (file && !S_ISDIR(file->mode))
1837                                 file = NULL;
1838                         lastpath_struct = file;
1839                 } else if (file && S_ISDIR(file->mode))
1840                         change_local_filter_dir(fname, strlen(fname), ++depth);
1841
1842                 strlcpy(lastpath, fname, sizeof lastpath);
1843                 lastpath_len = limit - fname;
1844
1845                 *limit = '/';
1846
1847                 copy_links = save_copy_links;
1848                 xfer_dirs = save_xfer_dirs;
1849
1850                 if (!inc_recurse)
1851                         goto done;
1852         }
1853
1854         if (!lastpath_struct)
1855                 goto done; /* dir must have vanished */
1856
1857         len = strlen(limit+1);
1858         memcpy(&relname_list, F_DIR_RELNAMES_P(lastpath_struct), sizeof relname_list);
1859         if (!relname_list) {
1860                 if (!(relname_list = new0(item_list)))
1861                         out_of_memory("send_implied_dirs");
1862                 memcpy(F_DIR_RELNAMES_P(lastpath_struct), &relname_list, sizeof relname_list);
1863         }
1864         rnpp = EXPAND_ITEM_LIST(relname_list, relnamecache *, 32);
1865         if (!(*rnpp = (relnamecache*)new_array(char, sizeof (relnamecache) + len)))
1866                 out_of_memory("send_implied_dirs");
1867         (*rnpp)->name_type = name_type;
1868         strlcpy((*rnpp)->fname, limit+1, len + 1);
1869
1870 done:
1871         filter_list = save_filter_list;
1872 }
1873
1874 static NORETURN void fatal_unsafe_io_error(void)
1875 {
1876         /* This (sadly) can only happen when pushing data because
1877          * the sender does not know about what kind of delete
1878          * is in effect on the receiving side when pulling. */
1879         rprintf(FERROR_XFER, "FATAL I/O ERROR: dying to avoid a --delete-during issue with a pre-3.0.7 receiver.\n");
1880         exit_cleanup(RERR_UNSUPPORTED);
1881 }
1882
1883 static void send1extra(int f, struct file_struct *file, struct file_list *flist)
1884 {
1885         char fbuf[MAXPATHLEN];
1886         item_list *relname_list;
1887         int len, dlen, flags = FLAG_DIVERT_DIRS | FLAG_CONTENT_DIR;
1888         size_t j;
1889
1890         f_name(file, fbuf);
1891         dlen = strlen(fbuf);
1892
1893         if (!change_pathname(file, NULL, 0))
1894                 exit_cleanup(RERR_FILESELECT);
1895
1896         change_local_filter_dir(fbuf, dlen, send_dir_depth);
1897
1898         if (file->flags & FLAG_CONTENT_DIR) {
1899                 if (one_file_system) {
1900                         STRUCT_STAT st;
1901                         if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1902                                 interpret_stat_error(fbuf, True);
1903                                 return;
1904                         }
1905                         filesystem_dev = st.st_dev;
1906                 }
1907                 send_directory(f, flist, fbuf, dlen, flags);
1908         }
1909
1910         if (!relative_paths)
1911                 return;
1912
1913         memcpy(&relname_list, F_DIR_RELNAMES_P(file), sizeof relname_list);
1914         if (!relname_list)
1915                 return;
1916
1917         for (j = 0; j < relname_list->count; j++) {
1918                 char *slash;
1919                 relnamecache *rnp = ((relnamecache**)relname_list->items)[j];
1920                 char name_type = rnp->name_type;
1921
1922                 fbuf[dlen] = '/';
1923                 len = strlcpy(fbuf + dlen + 1, rnp->fname, sizeof fbuf - dlen - 1);
1924                 free(rnp);
1925                 if (len >= (int)sizeof fbuf)
1926                         continue; /* Impossible... */
1927
1928                 slash = strchr(fbuf+dlen+1, '/');
1929                 if (slash) {
1930                         send_implied_dirs(f, flist, fbuf, fbuf+dlen+1, slash, flags, name_type);
1931                         continue;
1932                 }
1933
1934                 if (name_type != NORMAL_NAME) {
1935                         STRUCT_STAT st;
1936                         if (link_stat(fbuf, &st, 1) != 0) {
1937                                 interpret_stat_error(fbuf, True);
1938                                 continue;
1939                         }
1940                         send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR | flags, ALL_FILTERS);
1941                 } else
1942                         send_file_name(f, flist, fbuf, NULL, FLAG_TOP_DIR | flags, ALL_FILTERS);
1943         }
1944
1945         free(relname_list);
1946 }
1947
1948 void send_extra_file_list(int f, int at_least)
1949 {
1950         struct file_list *flist;
1951         int64 start_write;
1952         uint16 prev_flags;
1953         int save_io_error = io_error;
1954
1955         if (flist_eof)
1956                 return;
1957
1958         if (at_least < 0)
1959                 at_least = file_total - file_old_total + 1;
1960
1961         /* Keep sending data until we have the requested number of
1962          * files in the upcoming file-lists. */
1963         while (file_total - file_old_total < at_least) {
1964                 struct file_struct *file = dir_flist->sorted[send_dir_ndx];
1965                 int dir_ndx, dstart = stats.num_dirs;
1966                 const char *pathname = F_PATHNAME(file);
1967                 int32 *dp;
1968
1969                 flist = flist_new(0, "send_extra_file_list");
1970                 start_write = stats.total_written;
1971
1972                 if (unsort_ndx)
1973                         dir_ndx = F_NDX(file);
1974                 else
1975                         dir_ndx = send_dir_ndx;
1976                 write_ndx(f, NDX_FLIST_OFFSET - dir_ndx);
1977                 flist->parent_ndx = dir_ndx;
1978
1979                 send1extra(f, file, flist);
1980                 prev_flags = file->flags;
1981                 dp = F_DIR_NODE_P(file);
1982
1983                 /* If there are any duplicate directory names that follow, we
1984                  * send all the dirs together in one file-list.  The dir_flist
1985                  * tree links all the child subdirs onto the last dup dir. */
1986                 while ((dir_ndx = DIR_NEXT_SIBLING(dp)) >= 0
1987                     && dir_flist->sorted[dir_ndx]->flags & FLAG_DUPLICATE) {
1988                         send_dir_ndx = dir_ndx;
1989                         file = dir_flist->sorted[dir_ndx];
1990                         /* Try to avoid some duplicate scanning of identical dirs. */
1991                         if (F_PATHNAME(file) == pathname && prev_flags & FLAG_CONTENT_DIR)
1992                                 file->flags &= ~FLAG_CONTENT_DIR;
1993                         send1extra(f, file, flist);
1994                         prev_flags = file->flags;
1995                         dp = F_DIR_NODE_P(file);
1996                 }
1997
1998                 if (io_error == save_io_error || ignore_errors)
1999                         write_byte(f, 0);
2000                 else if (use_safe_inc_flist) {
2001                         write_shortint(f, XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST);
2002                         write_varint(f, io_error);
2003                 } else {
2004                         if (delete_during)
2005                                 fatal_unsafe_io_error();
2006                         write_byte(f, 0);
2007                 }
2008
2009                 if (need_unsorted_flist) {
2010                         if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2011                                 out_of_memory("send_extra_file_list");
2012                         memcpy(flist->sorted, flist->files,
2013                                flist->used * sizeof (struct file_struct*));
2014                 } else
2015                         flist->sorted = flist->files;
2016
2017                 flist_sort_and_clean(flist, 0);
2018
2019                 add_dirs_to_tree(send_dir_ndx, flist, stats.num_dirs - dstart);
2020                 flist_done_allocating(flist);
2021
2022                 file_total += flist->used;
2023                 stats.flist_size += stats.total_written - start_write;
2024                 stats.num_files += flist->used;
2025                 if (DEBUG_GTE(FLIST, 3))
2026                         output_flist(flist);
2027
2028                 if (DIR_FIRST_CHILD(dp) >= 0) {
2029                         send_dir_ndx = DIR_FIRST_CHILD(dp);
2030                         send_dir_depth++;
2031                 } else {
2032                         while (DIR_NEXT_SIBLING(dp) < 0) {
2033                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
2034                                         write_ndx(f, NDX_FLIST_EOF);
2035                                         flist_eof = 1;
2036                                         if (DEBUG_GTE(FLIST, 3))
2037                                                 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2038                                         change_local_filter_dir(NULL, 0, 0);
2039                                         goto finish;
2040                                 }
2041                                 send_dir_depth--;
2042                                 file = dir_flist->sorted[send_dir_ndx];
2043                                 dp = F_DIR_NODE_P(file);
2044                         }
2045                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
2046                 }
2047         }
2048
2049   finish:
2050         if (io_error != save_io_error && protocol_version == 30 && !ignore_errors)
2051                 send_msg_int(MSG_IO_ERROR, io_error);
2052 }
2053
2054 struct file_list *send_file_list(int f, int argc, char *argv[])
2055 {
2056         static const char *lastdir;
2057         static int lastdir_len = -1;
2058         int len, dirlen;
2059         STRUCT_STAT st;
2060         char *p, *dir;
2061         struct file_list *flist;
2062         struct timeval start_tv, end_tv;
2063         int64 start_write;
2064         int use_ff_fd = 0;
2065         int disable_buffering, reenable_multiplex = -1;
2066         int flags = recurse ? FLAG_CONTENT_DIR : 0;
2067         int reading_remotely = filesfrom_host != NULL;
2068         int rl_flags = (reading_remotely ? 0 : RL_DUMP_COMMENTS)
2069 #ifdef ICONV_OPTION
2070                      | (filesfrom_convert ? RL_CONVERT : 0)
2071 #endif
2072                      | (eol_nulls || reading_remotely ? RL_EOL_NULLS : 0);
2073         int implied_dot_dir = 0;
2074
2075         rprintf(FLOG, "building file list\n");
2076         if (show_filelist_p())
2077                 start_filelist_progress("building file list");
2078         else if (inc_recurse && INFO_GTE(FLIST, 1) && !am_server)
2079                 rprintf(FCLIENT, "sending incremental file list\n");
2080
2081         start_write = stats.total_written;
2082         gettimeofday(&start_tv, NULL);
2083
2084         if (relative_paths && protocol_version >= 30)
2085                 implied_dirs = 1; /* We send flagged implied dirs */
2086
2087 #ifdef SUPPORT_HARD_LINKS
2088         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
2089                 init_hard_links();
2090 #endif
2091
2092         flist = cur_flist = flist_new(0, "send_file_list");
2093         if (inc_recurse) {
2094                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
2095                 flags |= FLAG_DIVERT_DIRS;
2096         } else
2097                 dir_flist = cur_flist;
2098
2099         disable_buffering = io_start_buffering_out(f);
2100         if (filesfrom_fd >= 0) {
2101                 if (argv[0] && !change_dir(argv[0], CD_NORMAL)) {
2102                         rsyserr(FERROR_XFER, errno, "change_dir %s failed",
2103                                 full_fname(argv[0]));
2104                         exit_cleanup(RERR_FILESELECT);
2105                 }
2106                 if (protocol_version < 31) {
2107                         /* Older protocols send the files-from data w/o packaging
2108                          * it in multiplexed I/O packets, so temporarily switch
2109                          * to buffered I/O to match this behavior. */
2110                         reenable_multiplex = io_end_multiplex_in(MPLX_TO_BUFFERED);
2111                 }
2112                 use_ff_fd = 1;
2113         }
2114
2115         if (!orig_dir)
2116                 orig_dir = strdup(curr_dir);
2117
2118         while (1) {
2119                 char fbuf[MAXPATHLEN], *fn, name_type;
2120
2121                 if (use_ff_fd) {
2122                         if (read_line(filesfrom_fd, fbuf, sizeof fbuf, rl_flags) == 0)
2123                                 break;
2124                         sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
2125                 } else {
2126                         if (argc-- == 0)
2127                                 break;
2128                         strlcpy(fbuf, *argv++, MAXPATHLEN);
2129                         if (sanitize_paths)
2130                                 sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
2131                 }
2132
2133                 len = strlen(fbuf);
2134                 if (relative_paths) {
2135                         /* We clean up fbuf below. */
2136                         name_type = NORMAL_NAME;
2137                 } else if (!len || fbuf[len - 1] == '/') {
2138                         if (len == 2 && fbuf[0] == '.') {
2139                                 /* Turn "./" into just "." rather than "./." */
2140                                 fbuf[--len] = '\0';
2141                         } else {
2142                                 if (len + 1 >= MAXPATHLEN)
2143                                         overflow_exit("send_file_list");
2144                                 fbuf[len++] = '.';
2145                                 fbuf[len] = '\0';
2146                         }
2147                         name_type = DOTDIR_NAME;
2148                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
2149                     && (len == 2 || fbuf[len-3] == '/')) {
2150                         if (len + 2 >= MAXPATHLEN)
2151                                 overflow_exit("send_file_list");
2152                         fbuf[len++] = '/';
2153                         fbuf[len++] = '.';
2154                         fbuf[len] = '\0';
2155                         name_type = DOTDIR_NAME;
2156                 } else if (fbuf[len-1] == '.' && (len == 1 || fbuf[len-2] == '/'))
2157                         name_type = DOTDIR_NAME;
2158                 else
2159                         name_type = NORMAL_NAME;
2160
2161                 dir = NULL;
2162
2163                 if (!relative_paths) {
2164                         p = strrchr(fbuf, '/');
2165                         if (p) {
2166                                 *p = '\0';
2167                                 if (p == fbuf)
2168                                         dir = "/";
2169                                 else
2170                                         dir = fbuf;
2171                                 len -= p - fbuf + 1;
2172                                 fn = p + 1;
2173                         } else
2174                                 fn = fbuf;
2175                 } else {
2176                         if ((p = strstr(fbuf, "/./")) != NULL) {
2177                                 *p = '\0';
2178                                 if (p == fbuf)
2179                                         dir = "/";
2180                                 else {
2181                                         dir = fbuf;
2182                                         clean_fname(dir, 0);
2183                                 }
2184                                 fn = p + 3;
2185                                 while (*fn == '/')
2186                                         fn++;
2187                                 if (!*fn)
2188                                         *--fn = '\0'; /* ensure room for '.' */
2189                         } else
2190                                 fn = fbuf;
2191                         /* A leading ./ can be used in relative mode to affect
2192                          * the dest dir without its name being in the path. */
2193                         if (*fn == '.' && fn[1] == '/' && !implied_dot_dir) {
2194                                 send_file_name(f, flist, ".", NULL,
2195                                     (flags | FLAG_IMPLIED_DIR) & ~FLAG_CONTENT_DIR,
2196                                     ALL_FILTERS);
2197                                 implied_dot_dir = 1;
2198                         }
2199                         len = clean_fname(fn, CFN_KEEP_TRAILING_SLASH
2200                                             | CFN_DROP_TRAILING_DOT_DIR);
2201                         if (len == 1) {
2202                                 if (fn[0] == '/') {
2203                                         fn = "/.";
2204                                         len = 2;
2205                                         name_type = DOTDIR_NAME;
2206                                 } else if (fn[0] == '.')
2207                                         name_type = DOTDIR_NAME;
2208                         } else if (fn[len-1] == '/') {
2209                                 fn[--len] = '\0';
2210                                 if (len == 1 && *fn == '.')
2211                                         name_type = DOTDIR_NAME;
2212                                 else
2213                                         name_type = SLASH_ENDING_NAME;
2214                         }
2215                         /* Reject a ".." dir in the active part of the path. */
2216                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
2217                                 if ((p[2] == '/' || p[2] == '\0')
2218                                  && (p == fn || p[-1] == '/')) {
2219                                         rprintf(FERROR,
2220                                             "found \"..\" dir in relative path: %s\n",
2221                                             fn);
2222                                         exit_cleanup(RERR_SYNTAX);
2223                                 }
2224                         }
2225                 }
2226
2227                 if (!*fn) {
2228                         len = 1;
2229                         fn = ".";
2230                         name_type = DOTDIR_NAME;
2231                 }
2232
2233                 dirlen = dir ? strlen(dir) : 0;
2234                 if (dirlen != lastdir_len || memcmp(lastdir, dir, dirlen) != 0) {
2235                         if (!change_pathname(NULL, dir, -dirlen))
2236                                 continue;
2237                         lastdir = pathname;
2238                         lastdir_len = pathname_len;
2239                 } else if (!change_pathname(NULL, lastdir, lastdir_len))
2240                         continue;
2241
2242                 if (fn != fbuf)
2243                         memmove(fbuf, fn, len + 1);
2244
2245                 if (link_stat(fbuf, &st, copy_dirlinks || name_type != NORMAL_NAME) != 0
2246                  || (name_type != DOTDIR_NAME && is_daemon_excluded(fbuf, S_ISDIR(st.st_mode)))
2247                  || (relative_paths && path_is_daemon_excluded(fbuf, 1))) {
2248                         if (errno != ENOENT || missing_args == 0) {
2249                                 /* This is a transfer error, but inhibit deletion
2250                                  * only if we might be omitting an existing file. */
2251                                 if (errno != ENOENT)
2252                                         io_error |= IOERR_GENERAL;
2253                                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
2254                                         full_fname(fbuf));
2255                                 continue;
2256                         } else if (missing_args == 1) {
2257                                 /* Just ignore the arg. */
2258                                 continue;
2259                         } else /* (missing_args == 2) */ {
2260                                 /* Send the arg as a "missing" entry with
2261                                  * mode 0, which tells the generator to delete it. */
2262                                 memset(&st, 0, sizeof st);
2263                         }
2264                 }
2265
2266                 /* A dot-dir should not be excluded! */
2267                 if (name_type != DOTDIR_NAME && st.st_mode != 0
2268                  && is_excluded(fbuf, S_ISDIR(st.st_mode) != 0, ALL_FILTERS))
2269                         continue;
2270
2271                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
2272                         rprintf(FINFO, "skipping directory %s\n", fbuf);
2273                         continue;
2274                 }
2275
2276                 if (inc_recurse && relative_paths && *fbuf) {
2277                         if ((p = strchr(fbuf+1, '/')) != NULL) {
2278                                 if (p - fbuf == 1 && *fbuf == '.') {
2279                                         if ((fn = strchr(p+1, '/')) != NULL)
2280                                                 p = fn;
2281                                 } else
2282                                         fn = p;
2283                                 send_implied_dirs(f, flist, fbuf, fbuf, p, flags, name_type);
2284                                 if (fn == p)
2285                                         continue;
2286                         }
2287                 } else if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
2288                         /* Send the implied directories at the start of the
2289                          * source spec, so we get their permissions right. */
2290                         send_implied_dirs(f, flist, fbuf, fbuf, p, flags, 0);
2291                 }
2292
2293                 if (one_file_system)
2294                         filesystem_dev = st.st_dev;
2295
2296                 if (recurse || (xfer_dirs && name_type != NORMAL_NAME)) {
2297                         struct file_struct *file;
2298                         file = send_file_name(f, flist, fbuf, &st,
2299                                               FLAG_TOP_DIR | FLAG_CONTENT_DIR | flags,
2300                                               NO_FILTERS);
2301                         if (!file)
2302                                 continue;
2303                         if (inc_recurse) {
2304                                 if (name_type == DOTDIR_NAME) {
2305                                         if (send_dir_depth < 0) {
2306                                                 send_dir_depth = 0;
2307                                                 change_local_filter_dir(fbuf, len, send_dir_depth);
2308                                         }
2309                                         send_directory(f, flist, fbuf, len, flags);
2310                                 }
2311                         } else
2312                                 send_if_directory(f, flist, file, fbuf, len, flags);
2313                 } else
2314                         send_file_name(f, flist, fbuf, &st, flags, NO_FILTERS);
2315         }
2316
2317         if (reenable_multiplex >= 0)
2318                 io_start_multiplex_in(reenable_multiplex);
2319
2320         gettimeofday(&end_tv, NULL);
2321         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2322                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2323         if (stats.flist_buildtime == 0)
2324                 stats.flist_buildtime = 1;
2325         start_tv = end_tv;
2326
2327         /* Indicate end of file list */
2328         if (io_error == 0 || ignore_errors)
2329                 write_byte(f, 0);
2330         else if (use_safe_inc_flist) {
2331                 write_shortint(f, XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST);
2332                 write_varint(f, io_error);
2333         } else {
2334                 if (delete_during && inc_recurse)
2335                         fatal_unsafe_io_error();
2336                 write_byte(f, 0);
2337         }
2338
2339 #ifdef SUPPORT_HARD_LINKS
2340         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
2341                 idev_destroy();
2342 #endif
2343
2344         if (show_filelist_p())
2345                 finish_filelist_progress(flist);
2346
2347         gettimeofday(&end_tv, NULL);
2348         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2349                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2350
2351         /* When converting names, both sides keep an unsorted file-list array
2352          * because the names will differ on the sending and receiving sides
2353          * (both sides will use the unsorted index number for each item). */
2354
2355         /* Sort the list without removing any duplicates.  This allows the
2356          * receiving side to ask for whatever name it kept.  For incremental
2357          * recursion mode, the sender marks duplicate dirs so that it can
2358          * send them together in a single file-list. */
2359         if (need_unsorted_flist) {
2360                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2361                         out_of_memory("send_file_list");
2362                 memcpy(flist->sorted, flist->files,
2363                        flist->used * sizeof (struct file_struct*));
2364         } else
2365                 flist->sorted = flist->files;
2366         flist_sort_and_clean(flist, 0);
2367         file_total += flist->used;
2368         file_old_total += flist->used;
2369
2370         if (numeric_ids <= 0 && !inc_recurse)
2371                 send_id_list(f);
2372
2373         /* send the io_error flag */
2374         if (protocol_version < 30)
2375                 write_int(f, ignore_errors ? 0 : io_error);
2376         else if (!use_safe_inc_flist && io_error && !ignore_errors)
2377                 send_msg_int(MSG_IO_ERROR, io_error);
2378
2379         if (disable_buffering)
2380                 io_end_buffering_out(IOBUF_FREE_BUFS);
2381
2382         stats.flist_size = stats.total_written - start_write;
2383         stats.num_files = flist->used;
2384
2385         if (DEBUG_GTE(FLIST, 3))
2386                 output_flist(flist);
2387
2388         if (DEBUG_GTE(FLIST, 2))
2389                 rprintf(FINFO, "send_file_list done\n");
2390
2391         if (inc_recurse) {
2392                 send_dir_depth = 1;
2393                 add_dirs_to_tree(-1, flist, stats.num_dirs);
2394                 if (!file_total || strcmp(flist->sorted[flist->low]->basename, ".") != 0)
2395                         flist->parent_ndx = -1;
2396                 flist_done_allocating(flist);
2397                 if (send_dir_ndx < 0) {
2398                         write_ndx(f, NDX_FLIST_EOF);
2399                         flist_eof = 1;
2400                         if (DEBUG_GTE(FLIST, 3))
2401                                 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2402                 }
2403                 else if (file_total == 1) {
2404                         /* If we're creating incremental file-lists and there
2405                          * was just 1 item in the first file-list, send 1 more
2406                          * file-list to check if this is a 1-file xfer. */
2407                         send_extra_file_list(f, 1);
2408                 }
2409         } else {
2410                 flist_eof = 1;
2411                 if (DEBUG_GTE(FLIST, 3))
2412                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2413         }
2414
2415         return flist;
2416 }
2417
2418 struct file_list *recv_file_list(int f)
2419 {
2420         struct file_list *flist;
2421         int dstart, flags;
2422         int64 start_read;
2423
2424         if (!first_flist) {
2425                 if (show_filelist_p())
2426                         start_filelist_progress("receiving file list");
2427                 else if (inc_recurse && INFO_GTE(FLIST, 1) && !am_server)
2428                         rprintf(FCLIENT, "receiving incremental file list\n");
2429                 rprintf(FLOG, "receiving file list\n");
2430                 if (usermap)
2431                         parse_name_map(usermap, True);
2432                 if (groupmap)
2433                         parse_name_map(groupmap, False);
2434         }
2435
2436         start_read = stats.total_read;
2437
2438 #ifdef SUPPORT_HARD_LINKS
2439         if (preserve_hard_links && !first_flist)
2440                 init_hard_links();
2441 #endif
2442
2443         flist = flist_new(0, "recv_file_list");
2444
2445         if (inc_recurse) {
2446                 if (flist->ndx_start == 1)
2447                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
2448                 dstart = dir_flist->used;
2449         } else {
2450                 dir_flist = flist;
2451                 dstart = 0;
2452         }
2453
2454         while ((flags = read_byte(f)) != 0) {
2455                 struct file_struct *file;
2456
2457                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
2458                         flags |= read_byte(f) << 8;
2459
2460                 if (flags == (XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST)) {
2461                         int err;
2462                         if (!use_safe_inc_flist) {
2463                                 rprintf(FERROR, "Invalid flist flag: %x\n", flags);
2464                                 exit_cleanup(RERR_PROTOCOL);
2465                         }
2466                         err = read_varint(f);
2467                         if (!ignore_errors)
2468                                 io_error |= err;
2469                         break;
2470                 }
2471
2472                 flist_expand(flist, 1);
2473                 file = recv_file_entry(f, flist, flags);
2474
2475                 if (S_ISREG(file->mode)) {
2476                         /* Already counted */
2477                 } else if (S_ISDIR(file->mode)) {
2478                         if (inc_recurse) {
2479                                 flist_expand(dir_flist, 1);
2480                                 dir_flist->files[dir_flist->used++] = file;
2481                         }
2482                         stats.num_dirs++;
2483                 } else if (S_ISLNK(file->mode))
2484                         stats.num_symlinks++;
2485                 else if (IS_DEVICE(file->mode))
2486                         stats.num_symlinks++;
2487                 else
2488                         stats.num_specials++;
2489
2490                 flist->files[flist->used++] = file;
2491
2492                 maybe_emit_filelist_progress(flist->used);
2493
2494                 if (DEBUG_GTE(FLIST, 2)) {
2495                         char *name = f_name(file, NULL);
2496                         rprintf(FINFO, "recv_file_name(%s)\n", NS(name));
2497                 }
2498         }
2499         file_total += flist->used;
2500
2501         if (DEBUG_GTE(FLIST, 2))
2502                 rprintf(FINFO, "received %d names\n", flist->used);
2503
2504         if (show_filelist_p())
2505                 finish_filelist_progress(flist);
2506
2507         if (need_unsorted_flist) {
2508                 /* Create an extra array of index pointers that we can sort for
2509                  * the generator's use (for wading through the files in sorted
2510                  * order and for calling flist_find()).  We keep the "files"
2511                  * list unsorted for our exchange of index numbers with the
2512                  * other side (since their names may not sort the same). */
2513                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2514                         out_of_memory("recv_file_list");
2515                 memcpy(flist->sorted, flist->files,
2516                        flist->used * sizeof (struct file_struct*));
2517                 if (inc_recurse && dir_flist->used > dstart) {
2518                         static int dir_flist_malloced = 0;
2519                         if (dir_flist_malloced < dir_flist->malloced) {
2520                                 dir_flist->sorted = realloc_array(dir_flist->sorted,
2521                                                         struct file_struct *,
2522                                                         dir_flist->malloced);
2523                                 dir_flist_malloced = dir_flist->malloced;
2524                         }
2525                         memcpy(dir_flist->sorted + dstart, dir_flist->files + dstart,
2526                                (dir_flist->used - dstart) * sizeof (struct file_struct*));
2527                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2528                 }
2529         } else {
2530                 flist->sorted = flist->files;
2531                 if (inc_recurse && dir_flist->used > dstart) {
2532                         dir_flist->sorted = dir_flist->files;
2533                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2534                 }
2535         }
2536
2537         if (inc_recurse)
2538                 flist_done_allocating(flist);
2539         else if (f >= 0) {
2540                 recv_id_list(f, flist);
2541                 flist_eof = 1;
2542                 if (DEBUG_GTE(FLIST, 3))
2543                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2544         }
2545
2546         flist_sort_and_clean(flist, relative_paths);
2547
2548         if (protocol_version < 30) {
2549                 /* Recv the io_error flag */
2550                 int err = read_int(f);
2551                 if (!ignore_errors)
2552                         io_error |= err;
2553         } else if (inc_recurse && flist->ndx_start == 1) {
2554                 if (!file_total || strcmp(flist->sorted[flist->low]->basename, ".") != 0)
2555                         flist->parent_ndx = -1;
2556         }
2557
2558         if (DEBUG_GTE(FLIST, 3))
2559                 output_flist(flist);
2560
2561         if (DEBUG_GTE(FLIST, 2))
2562                 rprintf(FINFO, "recv_file_list done\n");
2563
2564         stats.flist_size += stats.total_read - start_read;
2565         stats.num_files += flist->used;
2566
2567         return flist;
2568 }
2569
2570 /* This is only used once by the receiver if the very first file-list
2571  * has exactly one item in it. */
2572 void recv_additional_file_list(int f)
2573 {
2574         struct file_list *flist;
2575         int ndx = read_ndx(f);
2576         if (ndx == NDX_FLIST_EOF) {
2577                 flist_eof = 1;
2578                 if (DEBUG_GTE(FLIST, 3))
2579                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2580                 change_local_filter_dir(NULL, 0, 0);
2581         } else {
2582                 ndx = NDX_FLIST_OFFSET - ndx;
2583                 if (ndx < 0 || ndx >= dir_flist->used) {
2584                         ndx = NDX_FLIST_OFFSET - ndx;
2585                         rprintf(FERROR,
2586                                 "[%s] Invalid dir index: %d (%d - %d)\n",
2587                                 who_am_i(), ndx, NDX_FLIST_OFFSET,
2588                                 NDX_FLIST_OFFSET - dir_flist->used + 1);
2589                         exit_cleanup(RERR_PROTOCOL);
2590                 }
2591                 if (DEBUG_GTE(FLIST, 3)) {
2592                         rprintf(FINFO, "[%s] receiving flist for dir %d\n",
2593                                 who_am_i(), ndx);
2594                 }
2595                 flist = recv_file_list(f);
2596                 flist->parent_ndx = ndx;
2597         }
2598 }
2599
2600 /* Search for an identically-named item in the file list.  Note that the
2601  * items must agree in their directory-ness, or no match is returned. */
2602 int flist_find(struct file_list *flist, struct file_struct *f)
2603 {
2604         int low = flist->low, high = flist->high;
2605         int diff, mid, mid_up;
2606
2607         while (low <= high) {
2608                 mid = (low + high) / 2;
2609                 if (F_IS_ACTIVE(flist->sorted[mid]))
2610                         mid_up = mid;
2611                 else {
2612                         /* Scan for the next non-empty entry using the cached
2613                          * distance values.  If the value isn't fully up-to-
2614                          * date, update it. */
2615                         mid_up = mid + F_DEPTH(flist->sorted[mid]);
2616                         if (!F_IS_ACTIVE(flist->sorted[mid_up])) {
2617                                 do {
2618                                     mid_up += F_DEPTH(flist->sorted[mid_up]);
2619                                 } while (!F_IS_ACTIVE(flist->sorted[mid_up]));
2620                                 F_DEPTH(flist->sorted[mid]) = mid_up - mid;
2621                         }
2622                         if (mid_up > high) {
2623                                 /* If there's nothing left above us, set high to
2624                                  * a non-empty entry below us and continue. */
2625                                 high = mid - (int)flist->sorted[mid]->len32;
2626                                 if (!F_IS_ACTIVE(flist->sorted[high])) {
2627                                         do {
2628                                             high -= (int)flist->sorted[high]->len32;
2629                                         } while (!F_IS_ACTIVE(flist->sorted[high]));
2630                                         flist->sorted[mid]->len32 = mid - high;
2631                                 }
2632                                 continue;
2633                         }
2634                 }
2635                 diff = f_name_cmp(flist->sorted[mid_up], f);
2636                 if (diff == 0) {
2637                         if (protocol_version < 29
2638                             && S_ISDIR(flist->sorted[mid_up]->mode)
2639                             != S_ISDIR(f->mode))
2640                                 return -1;
2641                         return mid_up;
2642                 }
2643                 if (diff < 0)
2644                         low = mid_up + 1;
2645                 else
2646                         high = mid - 1;
2647         }
2648         return -1;
2649 }
2650
2651 /* Search for an identically-named item in the file list.  Differs from
2652  * flist_find in that an item that agrees with "f" in directory-ness is
2653  * preferred but one that does not is still found. */
2654 int flist_find_ignore_dirness(struct file_list *flist, struct file_struct *f)
2655 {
2656         mode_t save_mode;
2657         int ndx;
2658
2659         /* First look for an item that agrees in directory-ness. */
2660         ndx = flist_find(flist, f);
2661         if (ndx >= 0)
2662                 return ndx;
2663
2664         /* Temporarily flip f->mode to look for an item of opposite
2665          * directory-ness. */
2666         save_mode = f->mode;
2667         f->mode = S_ISDIR(f->mode) ? S_IFREG : S_IFDIR;
2668         ndx = flist_find(flist, f);
2669         f->mode = save_mode;
2670         return ndx;
2671 }
2672
2673 /*
2674  * Free up any resources a file_struct has allocated
2675  * and clear the file.
2676  */
2677 void clear_file(struct file_struct *file)
2678 {
2679         /* The +1 zeros out the first char of the basename. */
2680         memset(file, 0, FILE_STRUCT_LEN + 1);
2681         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
2682          * entry.  Likewise for len32 in the opposite direction.  We assume
2683          * that we're alone for now since flist_find() will adjust the counts
2684          * it runs into that aren't up-to-date. */
2685         file->len32 = F_DEPTH(file) = 1;
2686 }
2687
2688 /* Allocate a new file list. */
2689 struct file_list *flist_new(int flags, char *msg)
2690 {
2691         struct file_list *flist;
2692
2693         if (!(flist = new0(struct file_list)))
2694                 out_of_memory(msg);
2695
2696         if (flags & FLIST_TEMP) {
2697                 if (!(flist->file_pool = pool_create(SMALL_EXTENT, 0,
2698                                                      out_of_memory,
2699                                                      POOL_INTERN)))
2700                         out_of_memory(msg);
2701         } else {
2702                 /* This is a doubly linked list with prev looping back to
2703                  * the end of the list, but the last next pointer is NULL. */
2704                 if (!first_flist) {
2705                         flist->file_pool = pool_create(NORMAL_EXTENT, 0,
2706                                                        out_of_memory,
2707                                                        POOL_INTERN);
2708                         if (!flist->file_pool)
2709                                 out_of_memory(msg);
2710
2711                         flist->ndx_start = flist->flist_num = inc_recurse ? 1 : 0;
2712
2713                         first_flist = cur_flist = flist->prev = flist;
2714                 } else {
2715                         struct file_list *prev = first_flist->prev;
2716
2717                         flist->file_pool = first_flist->file_pool;
2718
2719                         flist->ndx_start = prev->ndx_start + prev->used + 1;
2720                         flist->flist_num = prev->flist_num + 1;
2721
2722                         flist->prev = prev;
2723                         prev->next = first_flist->prev = flist;
2724                 }
2725                 flist->pool_boundary = pool_boundary(flist->file_pool, 0);
2726                 flist_cnt++;
2727         }
2728
2729         return flist;
2730 }
2731
2732 /* Free up all elements in a flist. */
2733 void flist_free(struct file_list *flist)
2734 {
2735         if (!flist->prev) {
2736                 /* Was FLIST_TEMP dir-list. */
2737         } else if (flist == flist->prev) {
2738                 first_flist = cur_flist = NULL;
2739                 file_total = 0;
2740                 flist_cnt = 0;
2741         } else {
2742                 if (flist == cur_flist)
2743                         cur_flist = flist->next;
2744                 if (flist == first_flist)
2745                         first_flist = first_flist->next;
2746                 else {
2747                         flist->prev->next = flist->next;
2748                         if (!flist->next)
2749                                 flist->next = first_flist;
2750                 }
2751                 flist->next->prev = flist->prev;
2752                 file_total -= flist->used;
2753                 flist_cnt--;
2754         }
2755
2756         if (!flist->prev || !flist_cnt)
2757                 pool_destroy(flist->file_pool);
2758         else
2759                 pool_free_old(flist->file_pool, flist->pool_boundary);
2760
2761         if (flist->sorted && flist->sorted != flist->files)
2762                 free(flist->sorted);
2763         free(flist->files);
2764         free(flist);
2765 }
2766
2767 /* This routine ensures we don't have any duplicate names in our file list.
2768  * duplicate names can cause corruption because of the pipelining. */
2769 static void flist_sort_and_clean(struct file_list *flist, int strip_root)
2770 {
2771         char fbuf[MAXPATHLEN];
2772         int i, prev_i;
2773
2774         if (!flist)
2775                 return;
2776         if (flist->used == 0) {
2777                 flist->high = -1;
2778                 flist->low = 0;
2779                 return;
2780         }
2781
2782         fsort(flist->sorted, flist->used);
2783
2784         if (!am_sender || inc_recurse) {
2785                 for (i = prev_i = 0; i < flist->used; i++) {
2786                         if (F_IS_ACTIVE(flist->sorted[i])) {
2787                                 prev_i = i;
2788                                 break;
2789                         }
2790                 }
2791                 flist->low = prev_i;
2792         } else {
2793                 i = prev_i = flist->used - 1;
2794                 flist->low = 0;
2795         }
2796
2797         while (++i < flist->used) {
2798                 int j;
2799                 struct file_struct *file = flist->sorted[i];
2800
2801                 if (!F_IS_ACTIVE(file))
2802                         continue;
2803                 if (f_name_cmp(file, flist->sorted[prev_i]) == 0)
2804                         j = prev_i;
2805                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
2806                         int save_mode = file->mode;
2807                         /* Make sure that this directory doesn't duplicate a
2808                          * non-directory earlier in the list. */
2809                         flist->high = prev_i;
2810                         file->mode = S_IFREG;
2811                         j = flist_find(flist, file);
2812                         file->mode = save_mode;
2813                 } else
2814                         j = -1;
2815                 if (j >= 0) {
2816                         int keep, drop;
2817                         /* If one is a dir and the other is not, we want to
2818                          * keep the dir because it might have contents in the
2819                          * list.  Otherwise keep the first one. */
2820                         if (S_ISDIR(file->mode)) {
2821                                 struct file_struct *fp = flist->sorted[j];
2822                                 if (!S_ISDIR(fp->mode))
2823                                         keep = i, drop = j;
2824                                 else {
2825                                         if (am_sender)
2826                                                 file->flags |= FLAG_DUPLICATE;
2827                                         else { /* Make sure we merge our vital flags. */
2828                                                 fp->flags |= file->flags & (FLAG_TOP_DIR|FLAG_CONTENT_DIR);
2829                                                 fp->flags &= file->flags | ~FLAG_IMPLIED_DIR;
2830                                         }
2831                                         keep = j, drop = i;
2832                                 }
2833                         } else
2834                                 keep = j, drop = i;
2835
2836                         if (!am_sender) {
2837                                 if (DEBUG_GTE(DUP, 1)) {
2838                                         rprintf(FINFO,
2839                                             "removing duplicate name %s from file list (%d)\n",
2840                                             f_name(file, fbuf), drop + flist->ndx_start);
2841                                 }
2842                                 clear_file(flist->sorted[drop]);
2843                         }
2844
2845                         if (keep == i) {
2846                                 if (flist->low == drop) {
2847                                         for (j = drop + 1;
2848                                              j < i && !F_IS_ACTIVE(flist->sorted[j]);
2849                                              j++) {}
2850                                         flist->low = j;
2851                                 }
2852                                 prev_i = i;
2853                         }
2854                 } else
2855                         prev_i = i;
2856         }
2857         flist->high = prev_i;
2858
2859         if (strip_root) {
2860                 /* We need to strip off the leading slashes for relative
2861                  * paths, but this must be done _after_ the sorting phase. */
2862                 for (i = flist->low; i <= flist->high; i++) {
2863                         struct file_struct *file = flist->sorted[i];
2864
2865                         if (!file->dirname)
2866                                 continue;
2867                         while (*file->dirname == '/')
2868                                 file->dirname++;
2869                         if (!*file->dirname)
2870                                 file->dirname = NULL;
2871                 }
2872         }
2873
2874         if (prune_empty_dirs && !am_sender) {
2875                 int j, prev_depth = 0;
2876
2877                 prev_i = 0; /* It's OK that this isn't really true. */
2878
2879                 for (i = flist->low; i <= flist->high; i++) {
2880                         struct file_struct *fp, *file = flist->sorted[i];
2881
2882                         /* This temporarily abuses the F_DEPTH() value for a
2883                          * directory that is in a chain that might get pruned.
2884                          * We restore the old value if it gets a reprieve. */
2885                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2886                                 /* Dump empty dirs when coming back down. */
2887                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2888                                         fp = flist->sorted[prev_i];
2889                                         if (F_DEPTH(fp) >= 0)
2890                                                 break;
2891                                         prev_i = -F_DEPTH(fp)-1;
2892                                         clear_file(fp);
2893                                 }
2894                                 prev_depth = F_DEPTH(file);
2895                                 if (is_excluded(f_name(file, fbuf), 1,
2896                                                        ALL_FILTERS)) {
2897                                         /* Keep dirs through this dir. */
2898                                         for (j = prev_depth-1; ; j--) {
2899                                                 fp = flist->sorted[prev_i];
2900                                                 if (F_DEPTH(fp) >= 0)
2901                                                         break;
2902                                                 prev_i = -F_DEPTH(fp)-1;
2903                                                 F_DEPTH(fp) = j;
2904                                         }
2905                                 } else
2906                                         F_DEPTH(file) = -prev_i-1;
2907                                 prev_i = i;
2908                         } else {
2909                                 /* Keep dirs through this non-dir. */
2910                                 for (j = prev_depth; ; j--) {
2911                                         fp = flist->sorted[prev_i];
2912                                         if (F_DEPTH(fp) >= 0)
2913                                                 break;
2914                                         prev_i = -F_DEPTH(fp)-1;
2915                                         F_DEPTH(fp) = j;
2916                                 }
2917                         }
2918                 }
2919                 /* Dump all remaining empty dirs. */
2920                 while (1) {
2921                         struct file_struct *fp = flist->sorted[prev_i];
2922                         if (F_DEPTH(fp) >= 0)
2923                                 break;
2924                         prev_i = -F_DEPTH(fp)-1;
2925                         clear_file(fp);
2926                 }
2927
2928                 for (i = flist->low; i <= flist->high; i++) {
2929                         if (F_IS_ACTIVE(flist->sorted[i]))
2930                                 break;
2931                 }
2932                 flist->low = i;
2933                 for (i = flist->high; i >= flist->low; i--) {
2934                         if (F_IS_ACTIVE(flist->sorted[i]))
2935                                 break;
2936                 }
2937                 flist->high = i;
2938         }
2939 }
2940
2941 static void output_flist(struct file_list *flist)
2942 {
2943         char uidbuf[16], gidbuf[16], depthbuf[16];
2944         struct file_struct *file;
2945         const char *root, *dir, *slash, *name, *trail;
2946         const char *who = who_am_i();
2947         int i;
2948
2949         rprintf(FINFO, "[%s] flist start=%d, used=%d, low=%d, high=%d\n",
2950                 who, flist->ndx_start, flist->used, flist->low, flist->high);
2951         for (i = 0; i < flist->used; i++) {
2952                 file = flist->files[i];
2953                 if ((am_root || am_sender) && uid_ndx) {
2954                         snprintf(uidbuf, sizeof uidbuf, " uid=%u",
2955                                  F_OWNER(file));
2956                 } else
2957                         *uidbuf = '\0';
2958                 if (gid_ndx) {
2959                         static char parens[] = "(\0)\0\0\0";
2960                         char *pp = parens + (file->flags & FLAG_SKIP_GROUP ? 0 : 3);
2961                         snprintf(gidbuf, sizeof gidbuf, " gid=%s%u%s",
2962                                  pp, F_GROUP(file), pp + 2);
2963                 } else
2964                         *gidbuf = '\0';
2965                 if (!am_sender)
2966                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2967                 if (F_IS_ACTIVE(file)) {
2968                         root = am_sender ? NS(F_PATHNAME(file)) : depthbuf;
2969                         if ((dir = file->dirname) == NULL)
2970                                 dir = slash = "";
2971                         else
2972                                 slash = "/";
2973                         name = file->basename;
2974                         trail = S_ISDIR(file->mode) ? "/" : "";
2975                 } else
2976                         root = dir = slash = name = trail = "";
2977                 rprintf(FINFO,
2978                         "[%s] i=%d %s %s%s%s%s mode=0%o len=%s%s%s flags=%x\n",
2979                         who, i + flist->ndx_start,
2980                         root, dir, slash, name, trail,
2981                         (int)file->mode, comma_num(F_LENGTH(file)),
2982                         uidbuf, gidbuf, file->flags);
2983         }
2984 }
2985
2986 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2987 enum fnc_type { t_PATH, t_ITEM };
2988
2989 static int found_prefix;
2990
2991 /* Compare the names of two file_struct entities, similar to how strcmp()
2992  * would do if it were operating on the joined strings.
2993  *
2994  * Some differences beginning with protocol_version 29: (1) directory names
2995  * are compared with an assumed trailing slash so that they compare in a
2996  * way that would cause them to sort immediately prior to any content they
2997  * may have; (2) a directory of any name compares after a non-directory of
2998  * any name at the same depth; (3) a directory with name "." compares prior
2999  * to anything else.  These changes mean that a directory and a non-dir
3000  * with the same name will not compare as equal (protocol_version >= 29).
3001  *
3002  * The dirname component can be an empty string, but the basename component
3003  * cannot (and never is in the current codebase).  The basename component
3004  * may be NULL (for a removed item), in which case it is considered to be
3005  * after any existing item. */
3006 int f_name_cmp(const struct file_struct *f1, const struct file_struct *f2)
3007 {
3008         int dif;
3009         const uchar *c1, *c2;
3010         enum fnc_state state1, state2;
3011         enum fnc_type type1, type2;
3012         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
3013
3014         if (!f1 || !F_IS_ACTIVE(f1)) {
3015                 if (!f2 || !F_IS_ACTIVE(f2))
3016                         return 0;
3017                 return -1;
3018         }
3019         if (!f2 || !F_IS_ACTIVE(f2))
3020                 return 1;
3021
3022         c1 = (uchar*)f1->dirname;
3023         c2 = (uchar*)f2->dirname;
3024         if (c1 == c2)
3025                 c1 = c2 = NULL;
3026         if (!c1) {
3027                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
3028                 c1 = (const uchar*)f1->basename;
3029                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
3030                         type1 = t_ITEM;
3031                         state1 = s_TRAILING;
3032                         c1 = (uchar*)"";
3033                 } else
3034                         state1 = s_BASE;
3035         } else {
3036                 type1 = t_path;
3037                 state1 = s_DIR;
3038         }
3039         if (!c2) {
3040                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
3041                 c2 = (const uchar*)f2->basename;
3042                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
3043                         type2 = t_ITEM;
3044                         state2 = s_TRAILING;
3045                         c2 = (uchar*)"";
3046                 } else
3047                         state2 = s_BASE;
3048         } else {
3049                 type2 = t_path;
3050                 state2 = s_DIR;
3051         }
3052
3053         if (type1 != type2)
3054                 return type1 == t_PATH ? 1 : -1;
3055
3056         do {
3057                 if (!*c1) {
3058                         switch (state1) {
3059                         case s_DIR:
3060                                 state1 = s_SLASH;
3061                                 c1 = (uchar*)"/";
3062                                 break;
3063                         case s_SLASH:
3064                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
3065                                 c1 = (const uchar*)f1->basename;
3066                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
3067                                         type1 = t_ITEM;
3068                                         state1 = s_TRAILING;
3069                                         c1 = (uchar*)"";
3070                                 } else
3071                                         state1 = s_BASE;
3072                                 break;
3073                         case s_BASE:
3074                                 state1 = s_TRAILING;
3075                                 if (type1 == t_PATH) {
3076                                         c1 = (uchar*)"/";
3077                                         break;
3078                                 }
3079                                 /* FALL THROUGH */
3080                         case s_TRAILING:
3081                                 type1 = t_ITEM;
3082                                 break;
3083                         }
3084                         if (*c2 && type1 != type2)
3085                                 return type1 == t_PATH ? 1 : -1;
3086                 }
3087                 if (!*c2) {
3088                         switch (state2) {
3089                         case s_DIR:
3090                                 state2 = s_SLASH;
3091                                 c2 = (uchar*)"/";
3092                                 break;
3093                         case s_SLASH:
3094                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
3095                                 c2 = (const uchar*)f2->basename;
3096                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
3097                                         type2 = t_ITEM;
3098                                         state2 = s_TRAILING;
3099                                         c2 = (uchar*)"";
3100                                 } else
3101                                         state2 = s_BASE;
3102                                 break;
3103                         case s_BASE:
3104                                 state2 = s_TRAILING;
3105                                 if (type2 == t_PATH) {
3106                                         c2 = (uchar*)"/";
3107                                         break;
3108                                 }
3109                                 /* FALL THROUGH */
3110                         case s_TRAILING:
3111                                 found_prefix = 1;
3112                                 if (!*c1)
3113                                         return 0;
3114                                 type2 = t_ITEM;
3115                                 break;
3116                         }
3117                         if (type1 != type2)
3118                                 return type1 == t_PATH ? 1 : -1;
3119                 }
3120         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
3121
3122         return dif;
3123 }
3124
3125 /* Returns 1 if f1's filename has all of f2's filename as a prefix.  This does
3126  * not match if f2's basename is not an exact match of a path element in f1.
3127  * E.g. /path/foo is not a prefix of /path/foobar/baz, but /path/foobar is. */
3128 int f_name_has_prefix(const struct file_struct *f1, const struct file_struct *f2)
3129 {
3130         found_prefix = 0;
3131         f_name_cmp(f1, f2);
3132         return found_prefix;
3133 }
3134
3135 char *f_name_buf(void)
3136 {
3137         static char names[5][MAXPATHLEN];
3138         static unsigned int n;
3139
3140         n = (n + 1) % (sizeof names / sizeof names[0]);
3141
3142         return names[n];
3143 }
3144
3145 /* Return a copy of the full filename of a flist entry, using the indicated
3146  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
3147  * done because we checked the size when creating the file_struct entry.
3148  */
3149 char *f_name(const struct file_struct *f, char *fbuf)
3150 {
3151         if (!f || !F_IS_ACTIVE(f))
3152                 return NULL;
3153
3154         if (!fbuf)
3155                 fbuf = f_name_buf();
3156
3157         if (f->dirname) {
3158                 int len = strlen(f->dirname);
3159                 memcpy(fbuf, f->dirname, len);
3160                 fbuf[len] = '/';
3161                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
3162         } else
3163                 strlcpy(fbuf, f->basename, MAXPATHLEN);
3164
3165         return fbuf;
3166 }
3167
3168 /* Do a non-recursive scan of the named directory, possibly ignoring all
3169  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
3170  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
3171  * buffer (the functions we call will append names onto the end, but the old
3172  * dir value will be restored on exit). */
3173 struct file_list *get_dirlist(char *dirname, int dlen, int flags)
3174 {
3175         struct file_list *dirlist;
3176         char dirbuf[MAXPATHLEN];
3177         int save_recurse = recurse;
3178         int save_xfer_dirs = xfer_dirs;
3179         int save_prune_empty_dirs = prune_empty_dirs;
3180         int senddir_fd = flags & GDL_IGNORE_FILTER_RULES ? -2 : -1;
3181
3182         if (dlen < 0) {
3183                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
3184                 if (dlen >= MAXPATHLEN)
3185                         return NULL;
3186                 dirname = dirbuf;
3187         }
3188
3189         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
3190
3191         recurse = 0;
3192         xfer_dirs = 1;
3193         send_directory(senddir_fd, dirlist, dirname, dlen, FLAG_CONTENT_DIR);
3194         xfer_dirs = save_xfer_dirs;
3195         recurse = save_recurse;
3196         if (INFO_GTE(PROGRESS, 1))
3197                 flist_count_offset += dirlist->used;
3198
3199         prune_empty_dirs = 0;
3200         dirlist->sorted = dirlist->files;
3201         flist_sort_and_clean(dirlist, 0);
3202         prune_empty_dirs = save_prune_empty_dirs;
3203
3204         if (DEBUG_GTE(FLIST, 3))
3205                 output_flist(dirlist);
3206
3207         return dirlist;
3208 }