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 #define MISSING_NAME 3
 106
 107 /* Starting from protocol version 26, we always use 64-bit ino_t and dev_t
 108  * internally, even if this platform does not allow files to have 64-bit inums.
 109  * The only exception is if we're on a platform with no 64-bit type at all.
 110  *
 111  * Because we use read_longint() to get these off the wire, if you transfer
 112  * devices or (for protocols < 30) hardlinks with dev or inum > 2**32 to a
 113  * machine with no 64-bit types then you will get an overflow error.
 114  *
 115  * Note that if you transfer devices from a 64-bit-devt machine (say, Solaris)
 116  * to a 32-bit-devt machine (say, Linux-2.2/x86) then the device numbers will
 117  * be truncated.  But it's a kind of silly thing to do anyhow. */
 118
 119 /* The tmp_* vars are used as a cache area by make_file() to store data
 120  * that the sender doesn't need to remember in its file list.  The data
 121  * will survive just long enough to be used by send_file_entry(). */
 122 static dev_t tmp_rdev;
 123 #ifdef SUPPORT_HARD_LINKS
 124 static int64 tmp_dev = -1, tmp_ino;
 125 #endif
 126 static char tmp_sum[MAX_DIGEST_LEN];
 127
 128 static char empty_sum[MAX_DIGEST_LEN];
 129 static int flist_count_offset; /* for --delete --progress */
 130
 131 static void flist_sort_and_clean(struct file_list *flist, int strip_root);
 132 static void output_flist(struct file_list *flist);
 133
 134 void init_flist(void)
 135 {
 136         if (DEBUG_GTE(FLIST, 4)) {
 137                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
 138                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
 139         }
 140         checksum_len = protocol_version < 21 ? 2
 141                      : protocol_version < 30 ? MD4_DIGEST_LEN
 142                      : MD5_DIGEST_LEN;
 143 }
 144
 145 static int show_filelist_p(void)
 146 {
 147         return INFO_GTE(FLIST, 1) && xfer_dirs && !am_server && !inc_recurse;
 148 }
 149
 150 static void start_filelist_progress(char *kind)
 151 {
 152         rprintf(FCLIENT, "%s ... ", kind);
 153         output_needs_newline = 1;
 154         rflush(FINFO);
 155 }
 156
 157 static void emit_filelist_progress(int count)
 158 {
 159         rprintf(FCLIENT, " %d files...\r", count);
 160 }
 161
 162 static void maybe_emit_filelist_progress(int count)
 163 {
 164         if (INFO_GTE(FLIST, 2) && show_filelist_p() && (count % 100) == 0)
 165                 emit_filelist_progress(count);
 166 }
 167
 168 static void finish_filelist_progress(const struct file_list *flist)
 169 {
 170         if (INFO_GTE(FLIST, 2)) {
 171                 /* This overwrites the progress line */
 172                 rprintf(FINFO, "%d file%sto consider\n",
 173                         flist->used, flist->used == 1 ? " " : "s ");
 174         } else {
 175                 output_needs_newline = 0;
 176                 rprintf(FINFO, "done\n");
 177         }
 178 }
 179
 180 void show_flist_stats(void)
 181 {
 182         /* Nothing yet */
 183 }
 184
 185 /* Stat either a symlink or its referent, depending on the settings of
 186  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 187  *
 188  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 189  * MAXPATHLEN chars) will be set to the symlink's target string.
 190  *
 191  * The stat structure pointed to by stp will contain information about the
 192  * link or the referent as appropriate, if they exist. */
 193 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 194 {
 195 #ifdef SUPPORT_LINKS
 196         if (link_stat(path, stp, copy_dirlinks) < 0)
 197                 return -1;
 198         if (S_ISLNK(stp->st_mode)) {
 199                 int llen = do_readlink(path, linkbuf, MAXPATHLEN - 1);
 200                 if (llen < 0)
 201                         return -1;
 202                 linkbuf[llen] = '\0';
 203                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 204                         if (INFO_GTE(SYMSAFE, 1)) {
 205                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 206                                         path, linkbuf);
 207                         }
 208                         return x_stat(path, stp, NULL);
 209                 }
 210                 if (munge_symlinks && am_sender && llen > SYMLINK_PREFIX_LEN
 211                  && strncmp(linkbuf, SYMLINK_PREFIX, SYMLINK_PREFIX_LEN) == 0) {
 212                         memmove(linkbuf, linkbuf + SYMLINK_PREFIX_LEN,
 213                                 llen - SYMLINK_PREFIX_LEN + 1);
 214                 }
 215         }
 216         return 0;
 217 #else
 218         return x_stat(path, stp, NULL);
 219 #endif
 220 }
 221
 222 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 223 {
 224 #ifdef SUPPORT_LINKS
 225         if (copy_links)
 226                 return x_stat(path, stp, NULL);
 227         if (x_lstat(path, stp, NULL) < 0)
 228                 return -1;
 229         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 230                 STRUCT_STAT st;
 231                 if (x_stat(path, &st, NULL) == 0 && S_ISDIR(st.st_mode))
 232                         *stp = st;
 233         }
 234         return 0;
 235 #else
 236         return x_stat(path, stp, NULL);
 237 #endif
 238 }
 239
 240 static inline int is_daemon_excluded(const char *fname, int is_dir)
 241 {
 242         if (daemon_filter_list.head
 243          && check_filter(&daemon_filter_list, FLOG, fname, is_dir) < 0) {
 244                 errno = ENOENT;
 245                 return 1;
 246         }
 247         return 0;
 248 }
 249
 250 static inline int path_is_daemon_excluded(char *path, int ignore_filename)
 251 {
 252         if (daemon_filter_list.head) {
 253                 char *slash = path;
 254
 255                 while ((slash = strchr(slash+1, '/')) != NULL) {
 256                         int ret;
 257                         *slash = '\0';
 258                         ret = check_filter(&daemon_filter_list, FLOG, path, 1);
 259                         *slash = '/';
 260                         if (ret < 0) {
 261                                 errno = ENOENT;
 262                                 return 1;
 263                         }
 264                 }
 265
 266                 if (!ignore_filename
 267                  && check_filter(&daemon_filter_list, FLOG, path, 1) < 0) {
 268                         errno = ENOENT;
 269                         return 1;
 270                 }
 271         }
 272
 273         return 0;
 274 }
 275
 276 /* This function is used to check if a file should be included/excluded
 277  * from the list of files based on its name and type etc.  The value of
 278  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 279 static int is_excluded(const char *fname, int is_dir, int filter_level)
 280 {
 281 #if 0 /* This currently never happens, so avoid a useless compare. */
 282         if (filter_level == NO_FILTERS)
 283                 return 0;
 284 #endif
 285         if (is_daemon_excluded(fname, is_dir))
 286                 return 1;
 287         if (filter_level != ALL_FILTERS)
 288                 return 0;
 289         if (filter_list.head
 290             && check_filter(&filter_list, FINFO, fname, is_dir) < 0)
 291                 return 1;
 292         return 0;
 293 }
 294
 295 static void send_directory(int f, struct file_list *flist,
 296                            char *fbuf, int len, int flags);
 297
 298 static const char *pathname, *orig_dir;
 299 static int pathname_len;
 300
 301 /* Make sure flist can hold at least flist->used + extra entries. */
 302 static void flist_expand(struct file_list *flist, int extra)
 303 {
 304         struct file_struct **new_ptr;
 305
 306         if (flist->used + extra <= flist->malloced)
 307                 return;
 308
 309         if (flist->malloced < FLIST_START)
 310                 flist->malloced = FLIST_START;
 311         else if (flist->malloced >= FLIST_LINEAR)
 312                 flist->malloced += FLIST_LINEAR;
 313         else
 314                 flist->malloced *= 2;
 315
 316         /* In case count jumped or we are starting the list
 317          * with a known size just set it. */
 318         if (flist->malloced < flist->used + extra)
 319                 flist->malloced = flist->used + extra;
 320
 321         new_ptr = realloc_array(flist->files, struct file_struct *,
 322                                 flist->malloced);
 323
 324         if (DEBUG_GTE(FLIST, 1) && flist->malloced != FLIST_START) {
 325                 rprintf(FCLIENT, "[%s] expand file_list pointer array to %s bytes, did%s move\n",
 326                     who_am_i(),
 327                     big_num(sizeof flist->files[0] * flist->malloced),
 328                     (new_ptr == flist->files) ? " not" : "");
 329         }
 330
 331         flist->files = new_ptr;
 332
 333         if (!flist->files)
 334                 out_of_memory("flist_expand");
 335 }
 336
 337 static void flist_done_allocating(struct file_list *flist)
 338 {
 339         void *ptr = pool_boundary(flist->file_pool, 8*1024);
 340         if (flist->pool_boundary == ptr)
 341                 flist->pool_boundary = NULL; /* list didn't use any pool memory */
 342         else
 343                 flist->pool_boundary = ptr;
 344 }
 345
 346 /* Call this with EITHER (1) "file, NULL, 0" to chdir() to the file's
 347  * F_PATHNAME(), or (2) "NULL, dir, dirlen" to chdir() to the supplied dir,
 348  * with dir == NULL taken to be the starting directory, and dirlen < 0
 349  * indicating that strdup(dir) should be called and then the -dirlen length
 350  * value checked to ensure that it is not daemon-excluded. */
 351 int change_pathname(struct file_struct *file, const char *dir, int dirlen)
 352 {
 353         if (dirlen < 0) {
 354                 char *cpy = strdup(dir);
 355                 if (*cpy != '/')
 356                         change_dir(orig_dir, CD_SKIP_CHDIR);
 357                 if (path_is_daemon_excluded(cpy, 0))
 358                         goto chdir_error;
 359                 dir = cpy;
 360                 dirlen = -dirlen;
 361         } else {
 362                 if (file) {
 363                         if (pathname == F_PATHNAME(file))
 364                                 return 1;
 365                         dir = F_PATHNAME(file);
 366                         if (dir)
 367                                 dirlen = strlen(dir);
 368                 } else if (pathname == dir)
 369                         return 1;
 370                 if (dir && *dir != '/')
 371                         change_dir(orig_dir, CD_SKIP_CHDIR);
 372         }
 373
 374         pathname = dir;
 375         pathname_len = dirlen;
 376
 377         if (!dir)
 378                 dir = orig_dir;
 379
 380         if (!change_dir(dir, CD_NORMAL)) {
 381           chdir_error:
 382                 io_error |= IOERR_GENERAL;
 383                 rsyserr(FERROR_XFER, errno, "change_dir %s failed", full_fname(dir));
 384                 if (dir != orig_dir)
 385                         change_dir(orig_dir, CD_NORMAL);
 386                 pathname = NULL;
 387                 pathname_len = 0;
 388                 return 0;
 389         }
 390
 391         return 1;
 392 }
 393
 394 static void send_file_entry(int f, const char *fname, struct file_struct *file,
 395 #ifdef SUPPORT_LINKS
 396                             const char *symlink_name, int symlink_len,
 397 #endif
 398                             int ndx, int first_ndx)
 399 {
 400         static time_t modtime;
 401         static mode_t mode;
 402 #ifdef SUPPORT_HARD_LINKS
 403         static int64 dev;
 404 #endif
 405         static dev_t rdev;
 406         static uint32 rdev_major;
 407         static uid_t uid;
 408         static gid_t gid;
 409         static const char *user_name, *group_name;
 410         static char lastname[MAXPATHLEN];
 411 #ifdef SUPPORT_HARD_LINKS
 412         int first_hlink_ndx = -1;
 413 #endif
 414         int l1, l2;
 415         int xflags;
 416
 417         /* Initialize starting value of xflags and adjust counts. */
 418         if (S_ISREG(file->mode))
 419                 xflags = 0;
 420         else if (S_ISDIR(file->mode)) {
 421                 stats.num_dirs++;
 422                 if (protocol_version >= 30) {
 423                         if (file->flags & FLAG_CONTENT_DIR)
 424                                 xflags = file->flags & FLAG_TOP_DIR;
 425                         else if (file->flags & FLAG_IMPLIED_DIR)
 426                                 xflags = XMIT_TOP_DIR | XMIT_NO_CONTENT_DIR;
 427                         else
 428                                 xflags = XMIT_NO_CONTENT_DIR;
 429                 } else
 430                         xflags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 431         } else {
 432                 if (S_ISLNK(file->mode))
 433                         stats.num_symlinks++;
 434                 else if (IS_DEVICE(file->mode))
 435                         stats.num_devices++;
 436                 else if (IS_SPECIAL(file->mode))
 437                         stats.num_specials++;
 438                 xflags = 0;
 439         }
 440
 441         if (file->mode == mode)
 442                 xflags |= XMIT_SAME_MODE;
 443         else
 444                 mode = file->mode;
 445
 446         if (preserve_devices && IS_DEVICE(mode)) {
 447                 if (protocol_version < 28) {
 448                         if (tmp_rdev == rdev)
 449                                 xflags |= XMIT_SAME_RDEV_pre28;
 450                         else
 451                                 rdev = tmp_rdev;
 452                 } else {
 453                         rdev = tmp_rdev;
 454                         if ((uint32)major(rdev) == rdev_major)
 455                                 xflags |= XMIT_SAME_RDEV_MAJOR;
 456                         else
 457                                 rdev_major = major(rdev);
 458                         if (protocol_version < 30 && (uint32)minor(rdev) <= 0xFFu)
 459                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
 460                 }
 461         } else if (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31) {
 462                 /* Special files don't need an rdev number, so just make
 463                  * the historical transmission of the value efficient. */
 464                 if (protocol_version < 28)
 465                         xflags |= XMIT_SAME_RDEV_pre28;
 466                 else {
 467                         rdev = MAKEDEV(major(rdev), 0);
 468                         xflags |= XMIT_SAME_RDEV_MAJOR;
 469                         if (protocol_version < 30)
 470                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
 471                 }
 472         } else if (protocol_version < 28)
 473                 rdev = MAKEDEV(0, 0);
 474         if (!preserve_uid || ((uid_t)F_OWNER(file) == uid && *lastname))
 475                 xflags |= XMIT_SAME_UID;
 476         else {
 477                 uid = F_OWNER(file);
 478                 if (!numeric_ids) {
 479                         user_name = add_uid(uid);
 480                         if (inc_recurse && user_name)
 481                                 xflags |= XMIT_USER_NAME_FOLLOWS;
 482                 }
 483         }
 484         if (!preserve_gid || ((gid_t)F_GROUP(file) == gid && *lastname))
 485                 xflags |= XMIT_SAME_GID;
 486         else {
 487                 gid = F_GROUP(file);
 488                 if (!numeric_ids) {
 489                         group_name = add_gid(gid);
 490                         if (inc_recurse && group_name)
 491                                 xflags |= XMIT_GROUP_NAME_FOLLOWS;
 492                 }
 493         }
 494         if (file->modtime == modtime)
 495                 xflags |= XMIT_SAME_TIME;
 496         else
 497                 modtime = file->modtime;
 498         if (NSEC_BUMP(file) && protocol_version >= 31)
 499                 xflags |= XMIT_MOD_NSEC;
 500
 501 #ifdef SUPPORT_HARD_LINKS
 502         if (tmp_dev != -1) {
 503                 if (protocol_version >= 30) {
 504                         struct ht_int64_node *np = idev_find(tmp_dev, tmp_ino);
 505                         first_hlink_ndx = (int32)(long)np->data - 1;
 506                         if (first_hlink_ndx < 0) {
 507                                 np->data = (void*)(long)(first_ndx + ndx + 1);
 508                                 xflags |= XMIT_HLINK_FIRST;
 509                         }
 510                         if (DEBUG_GTE(HLINK, 1)) {
 511                                 if (first_hlink_ndx >= 0) {
 512                                         rprintf(FINFO, "[%s] #%d hard-links #%d (%sabbrev)\n",
 513                                                 who_am_i(), first_ndx + ndx, first_hlink_ndx,
 514                                                 first_hlink_ndx >= first_ndx ? "" : "un");
 515                                 } else if (DEBUG_GTE(HLINK, 3)) {
 516                                         rprintf(FINFO, "[%s] dev:inode for #%d is %s:%s\n",
 517                                                 who_am_i(), first_ndx + ndx,
 518                                                 big_num(tmp_dev), big_num(tmp_ino));
 519                                 }
 520                         }
 521                 } else {
 522                         if (tmp_dev == dev) {
 523                                 if (protocol_version >= 28)
 524                                         xflags |= XMIT_SAME_DEV_pre30;
 525                         } else
 526                                 dev = tmp_dev;
 527                 }
 528                 xflags |= XMIT_HLINKED;
 529         }
 530 #endif
 531
 532         for (l1 = 0;
 533             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 534             l1++) {}
 535         l2 = strlen(fname+l1);
 536
 537         if (l1 > 0)
 538                 xflags |= XMIT_SAME_NAME;
 539         if (l2 > 255)
 540                 xflags |= XMIT_LONG_NAME;
 541
 542         /* We must make sure we don't send a zero flag byte or the
 543          * other end will terminate the flist transfer.  Note that
 544          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 545          * it's harmless way to add a bit to the first flag byte. */
 546         if (protocol_version >= 28) {
 547                 if (!xflags && !S_ISDIR(mode))
 548                         xflags |= XMIT_TOP_DIR;
 549                 if ((xflags & 0xFF00) || !xflags) {
 550                         xflags |= XMIT_EXTENDED_FLAGS;
 551                         write_shortint(f, xflags);
 552                 } else
 553                         write_byte(f, xflags);
 554         } else {
 555                 if (!(xflags & 0xFF))
 556                         xflags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 557                 write_byte(f, xflags);
 558         }
 559         if (xflags & XMIT_SAME_NAME)
 560                 write_byte(f, l1);
 561         if (xflags & XMIT_LONG_NAME)
 562                 write_varint30(f, l2);
 563         else
 564                 write_byte(f, l2);
 565         write_buf(f, fname + l1, l2);
 566
 567 #ifdef SUPPORT_HARD_LINKS
 568         if (first_hlink_ndx >= 0) {
 569                 write_varint(f, first_hlink_ndx);
 570                 if (first_hlink_ndx >= first_ndx)
 571                         goto the_end;
 572         }
 573 #endif
 574
 575         write_varlong30(f, F_LENGTH(file), 3);
 576         if (!(xflags & XMIT_SAME_TIME)) {
 577                 if (protocol_version >= 30)
 578                         write_varlong(f, modtime, 4);
 579                 else
 580                         write_int(f, modtime);
 581         }
 582         if (xflags & XMIT_MOD_NSEC)
 583                 write_varint(f, F_MOD_NSEC(file));
 584         if (!(xflags & XMIT_SAME_MODE))
 585                 write_int(f, to_wire_mode(mode));
 586         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
 587                 if (protocol_version < 30)
 588                         write_int(f, uid);
 589                 else {
 590                         write_varint(f, uid);
 591                         if (xflags & XMIT_USER_NAME_FOLLOWS) {
 592                                 int len = strlen(user_name);
 593                                 write_byte(f, len);
 594                                 write_buf(f, user_name, len);
 595                         }
 596                 }
 597         }
 598         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
 599                 if (protocol_version < 30)
 600                         write_int(f, gid);
 601                 else {
 602                         write_varint(f, gid);
 603                         if (xflags & XMIT_GROUP_NAME_FOLLOWS) {
 604                                 int len = strlen(group_name);
 605                                 write_byte(f, len);
 606                                 write_buf(f, group_name, len);
 607                         }
 608                 }
 609         }
 610         if ((preserve_devices && IS_DEVICE(mode))
 611          || (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31)) {
 612                 if (protocol_version < 28) {
 613                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 614                                 write_int(f, (int)rdev);
 615                 } else {
 616                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 617                                 write_varint30(f, major(rdev));
 618                         if (protocol_version >= 30)
 619                                 write_varint(f, minor(rdev));
 620                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 621                                 write_byte(f, minor(rdev));
 622                         else
 623                                 write_int(f, minor(rdev));
 624                 }
 625         }
 626
 627 #ifdef SUPPORT_LINKS
 628         if (symlink_len) {
 629                 write_varint30(f, symlink_len);
 630                 write_buf(f, symlink_name, symlink_len);
 631         }
 632 #endif
 633
 634 #ifdef SUPPORT_HARD_LINKS
 635         if (tmp_dev != -1 && protocol_version < 30) {
 636                 /* Older protocols expect the dev number to be transmitted
 637                  * 1-incremented so that it is never zero. */
 638                 if (protocol_version < 26) {
 639                         /* 32-bit dev_t and ino_t */
 640                         write_int(f, (int32)(dev+1));
 641                         write_int(f, (int32)tmp_ino);
 642                 } else {
 643                         /* 64-bit dev_t and ino_t */
 644                         if (!(xflags & XMIT_SAME_DEV_pre30))
 645                                 write_longint(f, dev+1);
 646                         write_longint(f, tmp_ino);
 647                 }
 648         }
 649 #endif
 650
 651         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 652                 const char *sum;
 653                 if (S_ISREG(mode))
 654                         sum = tmp_sum;
 655                 else {
 656                         /* Prior to 28, we sent a useless set of nulls. */
 657                         sum = empty_sum;
 658                 }
 659                 write_buf(f, sum, checksum_len);
 660         }
 661
 662 #ifdef SUPPORT_HARD_LINKS
 663   the_end:
 664 #endif
 665         strlcpy(lastname, fname, MAXPATHLEN);
 666
 667         if (S_ISREG(mode) || S_ISLNK(mode))
 668                 stats.total_size += F_LENGTH(file);
 669 }
 670
 671 static struct file_struct *recv_file_entry(int f, struct file_list *flist, int xflags)
 672 {
 673         static int64 modtime;
 674         static mode_t mode;
 675 #ifdef SUPPORT_HARD_LINKS
 676         static int64 dev;
 677 #endif
 678         static dev_t rdev;
 679         static uint32 rdev_major;
 680         static uid_t uid;
 681         static gid_t gid;
 682         static uint16 gid_flags;
 683         static char lastname[MAXPATHLEN], *lastdir;
 684         static int lastdir_depth, lastdir_len = -1;
 685         static unsigned int del_hier_name_len = 0;
 686         static int in_del_hier = 0;
 687         char thisname[MAXPATHLEN];
 688         unsigned int l1 = 0, l2 = 0;
 689         int alloc_len, basename_len, linkname_len;
 690         int extra_len = file_extra_cnt * EXTRA_LEN;
 691         int first_hlink_ndx = -1;
 692         int64 file_length;
 693         uint32 modtime_nsec;
 694         const char *basename;
 695         struct file_struct *file;
 696         alloc_pool_t *pool;
 697         char *bp;
 698
 699         if (xflags & XMIT_SAME_NAME)
 700                 l1 = read_byte(f);
 701
 702         if (xflags & XMIT_LONG_NAME)
 703                 l2 = read_varint30(f);
 704         else
 705                 l2 = read_byte(f);
 706
 707         if (l2 >= MAXPATHLEN - l1) {
 708                 rprintf(FERROR,
 709                         "overflow: xflags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 710                         xflags, l1, l2, lastname, who_am_i());
 711                 overflow_exit("recv_file_entry");
 712         }
 713
 714         strlcpy(thisname, lastname, l1 + 1);
 715         read_sbuf(f, &thisname[l1], l2);
 716         thisname[l1 + l2] = 0;
 717
 718         /* Abuse basename_len for a moment... */
 719         basename_len = strlcpy(lastname, thisname, MAXPATHLEN);
 720
 721 #ifdef ICONV_OPTION
 722         if (ic_recv != (iconv_t)-1) {
 723                 xbuf outbuf, inbuf;
 724
 725                 INIT_CONST_XBUF(outbuf, thisname);
 726                 INIT_XBUF(inbuf, lastname, basename_len, (size_t)-1);
 727
 728                 if (iconvbufs(ic_recv, &inbuf, &outbuf, ICB_INIT) < 0) {
 729                         io_error |= IOERR_GENERAL;
 730                         rprintf(FERROR_UTF8,
 731                             "[%s] cannot convert filename: %s (%s)\n",
 732                             who_am_i(), lastname, strerror(errno));
 733                         outbuf.len = 0;
 734                 }
 735                 thisname[outbuf.len] = '\0';
 736         }
 737 #endif
 738
 739         if (*thisname)
 740                 clean_fname(thisname, 0);
 741
 742         if (sanitize_paths)
 743                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
 744
 745         if ((basename = strrchr(thisname, '/')) != NULL) {
 746                 int len = basename++ - thisname;
 747                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 748                         lastdir = new_array(char, len + 1);
 749                         memcpy(lastdir, thisname, len);
 750                         lastdir[len] = '\0';
 751                         lastdir_len = len;
 752                         lastdir_depth = count_dir_elements(lastdir);
 753                 }
 754         } else
 755                 basename = thisname;
 756         basename_len = strlen(basename) + 1; /* count the '\0' */
 757
 758 #ifdef SUPPORT_HARD_LINKS
 759         if (protocol_version >= 30
 760          && BITS_SETnUNSET(xflags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 761                 first_hlink_ndx = read_varint(f);
 762                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->ndx_start + flist->used) {
 763                         rprintf(FERROR,
 764                                 "hard-link reference out of range: %d (%d)\n",
 765                                 first_hlink_ndx, flist->ndx_start + flist->used);
 766                         exit_cleanup(RERR_PROTOCOL);
 767                 }
 768                 if (DEBUG_GTE(HLINK, 1)) {
 769                         rprintf(FINFO, "[%s] #%d hard-links #%d (%sabbrev)\n",
 770                                 who_am_i(), flist->used+flist->ndx_start, first_hlink_ndx,
 771                                 first_hlink_ndx >= flist->ndx_start ? "" : "un");
 772                 }
 773                 if (first_hlink_ndx >= flist->ndx_start) {
 774                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
 775                         file_length = F_LENGTH(first);
 776                         modtime = first->modtime;
 777                         modtime_nsec = F_MOD_NSEC(first);
 778                         mode = first->mode;
 779                         if (preserve_uid)
 780                                 uid = F_OWNER(first);
 781                         if (preserve_gid)
 782                                 gid = F_GROUP(first);
 783                         if (preserve_devices && IS_DEVICE(mode)) {
 784                                 uint32 *devp = F_RDEV_P(first);
 785                                 rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 786                                 extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 787                         }
 788                         if (preserve_links && S_ISLNK(mode))
 789                                 linkname_len = strlen(F_SYMLINK(first)) + 1;
 790                         else
 791                                 linkname_len = 0;
 792                         goto create_object;
 793                 }
 794         }
 795 #endif
 796
 797         file_length = read_varlong30(f, 3);
 798         if (!(xflags & XMIT_SAME_TIME)) {
 799                 if (protocol_version >= 30) {
 800                         modtime = read_varlong(f, 4);
 801 #if SIZEOF_TIME_T < SIZEOF_INT64
 802                         if (!am_generator && (int64)(time_t)modtime != modtime) {
 803                                 rprintf(FERROR_XFER,
 804                                     "Time value of %s truncated on receiver.\n",
 805                                     lastname);
 806                         }
 807 #endif
 808                 } else
 809                         modtime = read_int(f);
 810         }
 811         if (xflags & XMIT_MOD_NSEC)
 812                 modtime_nsec = read_varint(f);
 813         else
 814                 modtime_nsec = 0;
 815         if (!(xflags & XMIT_SAME_MODE))
 816                 mode = from_wire_mode(read_int(f));
 817
 818         if (chmod_modes && !S_ISLNK(mode) && mode)
 819                 mode = tweak_mode(mode, chmod_modes);
 820
 821         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
 822                 if (protocol_version < 30)
 823                         uid = (uid_t)read_int(f);
 824                 else {
 825                         uid = (uid_t)read_varint(f);
 826                         if (xflags & XMIT_USER_NAME_FOLLOWS)
 827                                 uid = recv_user_name(f, uid);
 828                         else if (inc_recurse && am_root && (!numeric_ids || usermap))
 829                                 uid = match_uid(uid);
 830                 }
 831         }
 832         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
 833                 if (protocol_version < 30)
 834                         gid = (gid_t)read_int(f);
 835                 else {
 836                         gid = (gid_t)read_varint(f);
 837                         gid_flags = 0;
 838                         if (xflags & XMIT_GROUP_NAME_FOLLOWS)
 839                                 gid = recv_group_name(f, gid, &gid_flags);
 840                         else if (inc_recurse && (!am_root || !numeric_ids || groupmap))
 841                                 gid = match_gid(gid, &gid_flags);
 842                 }
 843         }
 844
 845         if ((preserve_devices && IS_DEVICE(mode))
 846          || (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31)) {
 847                 if (protocol_version < 28) {
 848                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 849                                 rdev = (dev_t)read_int(f);
 850                 } else {
 851                         uint32 rdev_minor;
 852                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 853                                 rdev_major = read_varint30(f);
 854                         if (protocol_version >= 30)
 855                                 rdev_minor = read_varint(f);
 856                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 857                                 rdev_minor = read_byte(f);
 858                         else
 859                                 rdev_minor = read_int(f);
 860                         rdev = MAKEDEV(rdev_major, rdev_minor);
 861                 }
 862                 if (IS_DEVICE(mode))
 863                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 864                 file_length = 0;
 865         } else if (protocol_version < 28)
 866                 rdev = MAKEDEV(0, 0);
 867
 868 #ifdef SUPPORT_LINKS
 869         if (preserve_links && S_ISLNK(mode)) {
 870                 linkname_len = read_varint30(f) + 1; /* count the '\0' */
 871                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 872                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 873                                 linkname_len - 1);
 874                         overflow_exit("recv_file_entry");
 875                 }
 876 #ifdef ICONV_OPTION
 877                 /* We don't know how much extra room we need to convert
 878                  * the as-yet-unread symlink data, so let's hope that a
 879                  * double-size buffer is plenty. */
 880                 if (sender_symlink_iconv)
 881                         linkname_len *= 2;
 882 #endif
 883                 if (munge_symlinks)
 884                         linkname_len += SYMLINK_PREFIX_LEN;
 885         }
 886         else
 887 #endif
 888                 linkname_len = 0;
 889
 890 #ifdef SUPPORT_HARD_LINKS
 891   create_object:
 892         if (preserve_hard_links) {
 893                 if (protocol_version < 28 && S_ISREG(mode))
 894                         xflags |= XMIT_HLINKED;
 895                 if (xflags & XMIT_HLINKED)
 896                         extra_len += (inc_recurse+1) * EXTRA_LEN;
 897         }
 898 #endif
 899
 900 #ifdef SUPPORT_ACLS
 901         /* Directories need an extra int32 for the default ACL. */
 902         if (preserve_acls && S_ISDIR(mode))
 903                 extra_len += EXTRA_LEN;
 904 #endif
 905
 906         if (always_checksum && S_ISREG(mode))
 907                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 908
 909 #if SIZEOF_INT64 >= 8
 910         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 911                 extra_len += EXTRA_LEN;
 912 #endif
 913 #ifdef HAVE_UTIMENSAT
 914         if (modtime_nsec)
 915                 extra_len += EXTRA_LEN;
 916 #endif
 917         if (file_length < 0) {
 918                 rprintf(FERROR, "Offset underflow: file-length is negative\n");
 919                 exit_cleanup(RERR_UNSUPPORTED);
 920         }
 921
 922         if (inc_recurse && S_ISDIR(mode)) {
 923                 if (one_file_system) {
 924                         /* Room to save the dir's device for -x */
 925                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 926                 }
 927                 pool = dir_flist->file_pool;
 928         } else
 929                 pool = flist->file_pool;
 930
 931 #if EXTRA_ROUNDING > 0
 932         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 933                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 934 #endif
 935
 936         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 937                   + linkname_len;
 938         bp = pool_alloc(pool, alloc_len, "recv_file_entry");
 939
 940         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 941         bp += extra_len;
 942         file = (struct file_struct *)bp;
 943         bp += FILE_STRUCT_LEN;
 944
 945         memcpy(bp, basename, basename_len);
 946
 947 #ifdef SUPPORT_HARD_LINKS
 948         if (xflags & XMIT_HLINKED)
 949                 file->flags |= FLAG_HLINKED;
 950 #endif
 951         file->modtime = (time_t)modtime;
 952 #ifdef HAVE_UTIMENSAT
 953         if (modtime_nsec) {
 954                 file->flags |= FLAG_MOD_NSEC;
 955                 OPT_EXTRA(file, 0)->unum = modtime_nsec;
 956         }
 957 #endif
 958         file->len32 = (uint32)file_length;
 959 #if SIZEOF_INT64 >= 8
 960         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 961 #if SIZEOF_CAPITAL_OFF_T < 8
 962                 rprintf(FERROR, "Offset overflow: attempted 64-bit file-length\n");
 963                 exit_cleanup(RERR_UNSUPPORTED);
 964 #else
 965                 file->flags |= FLAG_LENGTH64;
 966                 OPT_EXTRA(file, NSEC_BUMP(file))->unum = (uint32)(file_length >> 32);
 967 #endif
 968         }
 969 #endif
 970         file->mode = mode;
 971         if (preserve_uid)
 972                 F_OWNER(file) = uid;
 973         if (preserve_gid) {
 974                 F_GROUP(file) = gid;
 975                 file->flags |= gid_flags;
 976         }
 977         if (unsort_ndx)
 978                 F_NDX(file) = flist->used + flist->ndx_start;
 979
 980         if (basename != thisname) {
 981                 file->dirname = lastdir;
 982                 F_DEPTH(file) = lastdir_depth + 1;
 983         } else
 984                 F_DEPTH(file) = 1;
 985
 986         if (S_ISDIR(mode)) {
 987                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 988                         F_DEPTH(file)--;
 989                 if (protocol_version >= 30) {
 990                         if (!(xflags & XMIT_NO_CONTENT_DIR)) {
 991                                 if (xflags & XMIT_TOP_DIR)
 992                                         file->flags |= FLAG_TOP_DIR;
 993                                 file->flags |= FLAG_CONTENT_DIR;
 994                         } else if (xflags & XMIT_TOP_DIR)
 995                                 file->flags |= FLAG_IMPLIED_DIR;
 996                 } else if (xflags & XMIT_TOP_DIR) {
 997                         in_del_hier = recurse;
 998                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
 999                         if (relative_paths && del_hier_name_len > 2
1000                             && lastname[del_hier_name_len-1] == '.'
1001                             && lastname[del_hier_name_len-2] == '/')
1002                                 del_hier_name_len -= 2;
1003                         file->flags |= FLAG_TOP_DIR | FLAG_CONTENT_DIR;
1004                 } else if (in_del_hier) {
1005                         if (!relative_paths || !del_hier_name_len
1006                          || (l1 >= del_hier_name_len
1007                           && lastname[del_hier_name_len] == '/'))
1008                                 file->flags |= FLAG_CONTENT_DIR;
1009                         else
1010                                 in_del_hier = 0;
1011                 }
1012         }
1013
1014         if (preserve_devices && IS_DEVICE(mode)) {
1015                 uint32 *devp = F_RDEV_P(file);
1016                 DEV_MAJOR(devp) = major(rdev);
1017                 DEV_MINOR(devp) = minor(rdev);
1018         }
1019
1020 #ifdef SUPPORT_LINKS
1021         if (linkname_len) {
1022                 bp += basename_len;
1023                 if (first_hlink_ndx >= flist->ndx_start) {
1024                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
1025                         memcpy(bp, F_SYMLINK(first), linkname_len);
1026                 } else {
1027                         if (munge_symlinks) {
1028                                 strlcpy(bp, SYMLINK_PREFIX, linkname_len);
1029                                 bp += SYMLINK_PREFIX_LEN;
1030                                 linkname_len -= SYMLINK_PREFIX_LEN;
1031                         }
1032 #ifdef ICONV_OPTION
1033                         if (sender_symlink_iconv) {
1034                                 xbuf outbuf, inbuf;
1035
1036                                 alloc_len = linkname_len;
1037                                 linkname_len /= 2;
1038
1039                                 /* Read the symlink data into the end of our double-sized
1040                                  * buffer and then convert it into the right spot. */
1041                                 INIT_XBUF(inbuf, bp + alloc_len - linkname_len,
1042                                           linkname_len - 1, (size_t)-1);
1043                                 read_sbuf(f, inbuf.buf, inbuf.len);
1044                                 INIT_XBUF(outbuf, bp, 0, alloc_len);
1045
1046                                 if (iconvbufs(ic_recv, &inbuf, &outbuf, ICB_INIT) < 0) {
1047                                         io_error |= IOERR_GENERAL;
1048                                         rprintf(FERROR_XFER,
1049                                             "[%s] cannot convert symlink data for: %s (%s)\n",
1050                                             who_am_i(), full_fname(thisname), strerror(errno));
1051                                         bp = (char*)file->basename;
1052                                         *bp++ = '\0';
1053                                         outbuf.len = 0;
1054                                 }
1055                                 bp[outbuf.len] = '\0';
1056                         } else
1057 #endif
1058                                 read_sbuf(f, bp, linkname_len - 1);
1059                         if (sanitize_paths && !munge_symlinks && *bp)
1060                                 sanitize_path(bp, bp, "", lastdir_depth, SP_DEFAULT);
1061                 }
1062         }
1063 #endif
1064
1065 #ifdef SUPPORT_HARD_LINKS
1066         if (preserve_hard_links && xflags & XMIT_HLINKED) {
1067                 if (protocol_version >= 30) {
1068                         if (xflags & XMIT_HLINK_FIRST) {
1069                                 F_HL_GNUM(file) = flist->ndx_start + flist->used;
1070                         } else
1071                                 F_HL_GNUM(file) = first_hlink_ndx;
1072                 } else {
1073                         static int32 cnt = 0;
1074                         struct ht_int64_node *np;
1075                         int64 ino;
1076                         int32 ndx;
1077                         if (protocol_version < 26) {
1078                                 dev = read_int(f);
1079                                 ino = read_int(f);
1080                         } else {
1081                                 if (!(xflags & XMIT_SAME_DEV_pre30))
1082                                         dev = read_longint(f);
1083                                 ino = read_longint(f);
1084                         }
1085                         np = idev_find(dev, ino);
1086                         ndx = (int32)(long)np->data - 1;
1087                         if (ndx < 0) {
1088                                 ndx = cnt++;
1089                                 np->data = (void*)(long)cnt;
1090                         }
1091                         F_HL_GNUM(file) = ndx;
1092                 }
1093         }
1094 #endif
1095
1096         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
1097                 if (S_ISREG(mode))
1098                         bp = F_SUM(file);
1099                 else {
1100                         /* Prior to 28, we get a useless set of nulls. */
1101                         bp = tmp_sum;
1102                 }
1103                 if (first_hlink_ndx >= flist->ndx_start) {
1104                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
1105                         memcpy(bp, F_SUM(first), checksum_len);
1106                 } else
1107                         read_buf(f, bp, checksum_len);
1108         }
1109
1110 #ifdef SUPPORT_ACLS
1111         if (preserve_acls && !S_ISLNK(mode))
1112                 receive_acl(f, file);
1113 #endif
1114 #ifdef SUPPORT_XATTRS
1115         if (preserve_xattrs)
1116                 receive_xattr(f, file);
1117 #endif
1118
1119         if (S_ISREG(mode) || S_ISLNK(mode))
1120                 stats.total_size += file_length;
1121
1122         return file;
1123 }
1124
1125 /* Create a file_struct for a named file by reading its stat() information
1126  * and performing extensive checks against global options.
1127  *
1128  * Returns a pointer to the new file struct, or NULL if there was an error
1129  * or this file should be excluded.
1130  *
1131  * Note: Any error (here or in send_file_name) that results in the omission of
1132  * an existent source file from the file list should set
1133  * "io_error |= IOERR_GENERAL" to avoid deletion of the file from the
1134  * destination if --delete is on. */
1135 struct file_struct *make_file(const char *fname, struct file_list *flist,
1136                               STRUCT_STAT *stp, int flags, int filter_level)
1137 {
1138         static char *lastdir;
1139         static int lastdir_len = -1;
1140         struct file_struct *file;
1141         char thisname[MAXPATHLEN];
1142         char linkname[MAXPATHLEN];
1143         int alloc_len, basename_len, linkname_len;
1144         int extra_len = file_extra_cnt * EXTRA_LEN;
1145         const char *basename;
1146         alloc_pool_t *pool;
1147         STRUCT_STAT st;
1148         char *bp;
1149
1150         if (strlcpy(thisname, fname, sizeof thisname) >= sizeof thisname) {
1151                 io_error |= IOERR_GENERAL;
1152                 rprintf(FERROR_XFER, "skipping overly long name: %s\n", fname);
1153                 return NULL;
1154         }
1155         clean_fname(thisname, 0);
1156         if (sanitize_paths)
1157                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
1158
1159         if (stp && (S_ISDIR(stp->st_mode) || stp->st_mode == 0)) {
1160                 /* This is needed to handle a "symlink/." with a --relative
1161                  * dir, or a request to delete a specific file. */
1162                 st = *stp;
1163                 *linkname = '\0'; /* make IBM code checker happy */
1164         } else if (readlink_stat(thisname, &st, linkname) != 0) {
1165                 int save_errno = errno;
1166                 /* See if file is excluded before reporting an error. */
1167                 if (filter_level != NO_FILTERS
1168                  && (is_excluded(thisname, 0, filter_level)
1169                   || is_excluded(thisname, 1, filter_level))) {
1170                         if (ignore_perishable && save_errno != ENOENT)
1171                                 non_perishable_cnt++;
1172                         return NULL;
1173                 }
1174                 if (save_errno == ENOENT) {
1175 #ifdef SUPPORT_LINKS
1176                         /* When our options tell us to follow a symlink that
1177                          * points nowhere, tell the user about the symlink
1178                          * instead of giving a "vanished" message.  We only
1179                          * dereference a symlink if one of the --copy*links
1180                          * options was specified, so there's no need for the
1181                          * extra lstat() if one of these options isn't on. */
1182                         if ((copy_links || copy_unsafe_links || copy_dirlinks)
1183                          && x_lstat(thisname, &st, NULL) == 0
1184                          && S_ISLNK(st.st_mode)) {
1185                                 io_error |= IOERR_GENERAL;
1186                                 rprintf(FERROR_XFER, "symlink has no referent: %s\n",
1187                                         full_fname(thisname));
1188                         } else
1189 #endif
1190                         {
1191                                 enum logcode c = am_daemon && protocol_version < 28
1192                                                ? FERROR : FWARNING;
1193                                 io_error |= IOERR_VANISHED;
1194                                 rprintf(c, "file has vanished: %s\n",
1195                                         full_fname(thisname));
1196                         }
1197                 } else {
1198                         io_error |= IOERR_GENERAL;
1199                         rsyserr(FERROR_XFER, save_errno, "readlink_stat(%s) failed",
1200                                 full_fname(thisname));
1201                 }
1202                 return NULL;
1203         } else if (st.st_mode == 0) {
1204                 io_error |= IOERR_GENERAL;
1205                 rprintf(FINFO, "skipping file with bogus (zero) st_mode: %s\n",
1206                         full_fname(thisname));
1207                 return NULL;
1208         }
1209
1210         if (filter_level == NO_FILTERS)
1211                 goto skip_filters;
1212
1213         if (S_ISDIR(st.st_mode)) {
1214                 if (!xfer_dirs) {
1215                         rprintf(FINFO, "skipping directory %s\n", thisname);
1216                         return NULL;
1217                 }
1218                 /* -x only affects dirs because we need to avoid recursing
1219                  * into a mount-point directory, not to avoid copying a
1220                  * symlinked file if -L (or similar) was specified. */
1221                 if (one_file_system && st.st_dev != filesystem_dev
1222                  && BITS_SETnUNSET(flags, FLAG_CONTENT_DIR, FLAG_TOP_DIR)) {
1223                         if (one_file_system > 1) {
1224                                 if (INFO_GTE(MOUNT, 1)) {
1225                                         rprintf(FINFO,
1226                                             "[%s] skipping mount-point dir %s\n",
1227                                             who_am_i(), thisname);
1228                                 }
1229                                 return NULL;
1230                         }
1231                         flags |= FLAG_MOUNT_DIR;
1232                         flags &= ~FLAG_CONTENT_DIR;
1233                 }
1234         } else
1235                 flags &= ~FLAG_CONTENT_DIR;
1236
1237         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
1238                 if (ignore_perishable)
1239                         non_perishable_cnt++;
1240                 return NULL;
1241         }
1242
1243         if (lp_ignore_nonreadable(module_id)) {
1244 #ifdef SUPPORT_LINKS
1245                 if (!S_ISLNK(st.st_mode))
1246 #endif
1247                         if (access(thisname, R_OK) != 0)
1248                                 return NULL;
1249         }
1250
1251   skip_filters:
1252
1253         /* Only divert a directory in the main transfer. */
1254         if (flist) {
1255                 if (flist->prev && S_ISDIR(st.st_mode)
1256                  && flags & FLAG_DIVERT_DIRS) {
1257                         /* Room for parent/sibling/next-child info. */
1258                         extra_len += DIRNODE_EXTRA_CNT * EXTRA_LEN;
1259                         if (relative_paths)
1260                                 extra_len += PTR_EXTRA_CNT * EXTRA_LEN;
1261                         pool = dir_flist->file_pool;
1262                 } else
1263                         pool = flist->file_pool;
1264         } else {
1265 #ifdef SUPPORT_ACLS
1266                 /* Directories need an extra int32 for the default ACL. */
1267                 if (preserve_acls && S_ISDIR(st.st_mode))
1268                         extra_len += EXTRA_LEN;
1269 #endif
1270                 pool = NULL;
1271         }
1272
1273         if (DEBUG_GTE(FLIST, 2)) {
1274                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1275                         who_am_i(), thisname, filter_level);
1276         }
1277
1278         if ((basename = strrchr(thisname, '/')) != NULL) {
1279                 int len = basename++ - thisname;
1280                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1281                         lastdir = new_array(char, len + 1);
1282                         memcpy(lastdir, thisname, len);
1283                         lastdir[len] = '\0';
1284                         lastdir_len = len;
1285                 }
1286         } else
1287                 basename = thisname;
1288         basename_len = strlen(basename) + 1; /* count the '\0' */
1289
1290 #ifdef SUPPORT_LINKS
1291         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1292 #else
1293         linkname_len = 0;
1294 #endif
1295
1296 #ifdef ST_MTIME_NSEC
1297         if (st.ST_MTIME_NSEC && protocol_version >= 31)
1298                 extra_len += EXTRA_LEN;
1299 #endif
1300 #if SIZEOF_CAPITAL_OFF_T >= 8
1301         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1302                 extra_len += EXTRA_LEN;
1303 #endif
1304
1305         if (always_checksum && am_sender && S_ISREG(st.st_mode)) {
1306                 file_checksum(thisname, tmp_sum, st.st_size);
1307                 if (sender_keeps_checksum)
1308                         extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
1309         }
1310
1311 #if EXTRA_ROUNDING > 0
1312         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1313                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1314 #endif
1315
1316         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1317                   + linkname_len;
1318         if (pool)
1319                 bp = pool_alloc(pool, alloc_len, "make_file");
1320         else {
1321                 if (!(bp = new_array(char, alloc_len)))
1322                         out_of_memory("make_file");
1323         }
1324
1325         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1326         bp += extra_len;
1327         file = (struct file_struct *)bp;
1328         bp += FILE_STRUCT_LEN;
1329
1330         memcpy(bp, basename, basename_len);
1331
1332 #ifdef SUPPORT_HARD_LINKS
1333         if (preserve_hard_links && flist && flist->prev) {
1334                 if (protocol_version >= 28
1335                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1336                  : S_ISREG(st.st_mode)) {
1337                         tmp_dev = (int64)st.st_dev;
1338                         tmp_ino = (int64)st.st_ino;
1339                 } else
1340                         tmp_dev = -1;
1341         }
1342 #endif
1343
1344 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1345         if (IS_DEVICE(st.st_mode)) {
1346                 tmp_rdev = st.st_rdev;
1347                 st.st_size = 0;
1348         } else if (IS_SPECIAL(st.st_mode))
1349                 st.st_size = 0;
1350 #endif
1351
1352         file->flags = flags;
1353         file->modtime = st.st_mtime;
1354 #ifdef ST_MTIME_NSEC
1355         if (st.ST_MTIME_NSEC && protocol_version >= 31) {
1356                 file->flags |= FLAG_MOD_NSEC;
1357                 OPT_EXTRA(file, 0)->unum = st.ST_MTIME_NSEC;
1358         }
1359 #endif
1360         file->len32 = (uint32)st.st_size;
1361 #if SIZEOF_CAPITAL_OFF_T >= 8
1362         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1363                 file->flags |= FLAG_LENGTH64;
1364                 OPT_EXTRA(file, NSEC_BUMP(file))->unum = (uint32)(st.st_size >> 32);
1365         }
1366 #endif
1367         file->mode = st.st_mode;
1368         if (preserve_uid)
1369                 F_OWNER(file) = st.st_uid;
1370         if (preserve_gid)
1371                 F_GROUP(file) = st.st_gid;
1372         if (am_generator && st.st_uid == our_uid)
1373                 file->flags |= FLAG_OWNED_BY_US;
1374
1375         if (basename != thisname)
1376                 file->dirname = lastdir;
1377
1378 #ifdef SUPPORT_LINKS
1379         if (linkname_len)
1380                 memcpy(bp + basename_len, linkname, linkname_len);
1381 #endif
1382
1383         if (am_sender)
1384                 F_PATHNAME(file) = pathname;
1385         else if (!pool)
1386                 F_DEPTH(file) = extra_len / EXTRA_LEN;
1387
1388         if (basename_len == 0+1) {
1389                 if (!pool)
1390                         unmake_file(file);
1391                 return NULL;
1392         }
1393
1394         if (sender_keeps_checksum && S_ISREG(st.st_mode))
1395                 memcpy(F_SUM(file), tmp_sum, checksum_len);
1396
1397         if (unsort_ndx)
1398                 F_NDX(file) = stats.num_dirs;
1399
1400         return file;
1401 }
1402
1403 /* Only called for temporary file_struct entries created by make_file(). */
1404 void unmake_file(struct file_struct *file)
1405 {
1406         free(REQ_EXTRA(file, F_DEPTH(file)));
1407 }
1408
1409 static struct file_struct *send_file_name(int f, struct file_list *flist,
1410                                           const char *fname, STRUCT_STAT *stp,
1411                                           int flags, int filter_level)
1412 {
1413         struct file_struct *file;
1414
1415         file = make_file(fname, flist, stp, flags, filter_level);
1416         if (!file)
1417                 return NULL;
1418
1419         if (chmod_modes && !S_ISLNK(file->mode) && file->mode)
1420                 file->mode = tweak_mode(file->mode, chmod_modes);
1421
1422         if (f >= 0) {
1423                 char fbuf[MAXPATHLEN];
1424 #ifdef SUPPORT_LINKS
1425                 const char *symlink_name;
1426                 int symlink_len;
1427 #ifdef ICONV_OPTION
1428                 char symlink_buf[MAXPATHLEN];
1429 #endif
1430 #endif
1431 #if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
1432                 stat_x sx;
1433                 init_stat_x(&sx);
1434 #endif
1435
1436 #ifdef SUPPORT_LINKS
1437                 if (preserve_links && S_ISLNK(file->mode)) {
1438                         symlink_name = F_SYMLINK(file);
1439                         symlink_len = strlen(symlink_name);
1440                         if (symlink_len == 0) {
1441                                 io_error |= IOERR_GENERAL;
1442                                 f_name(file, fbuf);
1443                                 rprintf(FERROR_XFER,
1444                                     "skipping symlink with 0-length value: %s\n",
1445                                     full_fname(fbuf));
1446                                 return NULL;
1447                         }
1448                 } else {
1449                         symlink_name = NULL;
1450                         symlink_len = 0;
1451                 }
1452 #endif
1453
1454 #ifdef ICONV_OPTION
1455                 if (ic_send != (iconv_t)-1) {
1456                         xbuf outbuf, inbuf;
1457
1458                         INIT_CONST_XBUF(outbuf, fbuf);
1459
1460                         if (file->dirname) {
1461                                 INIT_XBUF_STRLEN(inbuf, (char*)file->dirname);
1462                                 outbuf.size -= 2; /* Reserve room for '/' & 1 more char. */
1463                                 if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0)
1464                                         goto convert_error;
1465                                 outbuf.size += 2;
1466                                 fbuf[outbuf.len++] = '/';
1467                         }
1468
1469                         INIT_XBUF_STRLEN(inbuf, (char*)file->basename);
1470                         if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0) {
1471                           convert_error:
1472                                 io_error |= IOERR_GENERAL;
1473                                 rprintf(FERROR_XFER,
1474                                     "[%s] cannot convert filename: %s (%s)\n",
1475                                     who_am_i(), f_name(file, fbuf), strerror(errno));
1476                                 return NULL;
1477                         }
1478                         fbuf[outbuf.len] = '\0';
1479
1480 #ifdef SUPPORT_LINKS
1481                         if (symlink_len && sender_symlink_iconv) {
1482                                 INIT_XBUF(inbuf, (char*)symlink_name, symlink_len, (size_t)-1);
1483                                 INIT_CONST_XBUF(outbuf, symlink_buf);
1484                                 if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0) {
1485                                         io_error |= IOERR_GENERAL;
1486                                         f_name(file, fbuf);
1487                                         rprintf(FERROR_XFER,
1488                                             "[%s] cannot convert symlink data for: %s (%s)\n",
1489                                             who_am_i(), full_fname(fbuf), strerror(errno));
1490                                         return NULL;
1491                                 }
1492                                 symlink_buf[outbuf.len] = '\0';
1493
1494                                 symlink_name = symlink_buf;
1495                                 symlink_len = outbuf.len;
1496                         }
1497 #endif
1498                 } else
1499 #endif
1500                         f_name(file, fbuf);
1501
1502 #ifdef SUPPORT_ACLS
1503                 if (preserve_acls && !S_ISLNK(file->mode)) {
1504                         sx.st.st_mode = file->mode;
1505                         if (get_acl(fname, &sx) < 0) {
1506                                 io_error |= IOERR_GENERAL;
1507                                 return NULL;
1508                         }
1509                 }
1510 #endif
1511 #ifdef SUPPORT_XATTRS
1512                 if (preserve_xattrs) {
1513                         sx.st.st_mode = file->mode;
1514                         if (get_xattr(fname, &sx) < 0) {
1515                                 io_error |= IOERR_GENERAL;
1516                                 return NULL;
1517                         }
1518                 }
1519 #endif
1520
1521                 send_file_entry(f, fbuf, file,
1522 #ifdef SUPPORT_LINKS
1523                                 symlink_name, symlink_len,
1524 #endif
1525                                 flist->used, flist->ndx_start);
1526
1527 #ifdef SUPPORT_ACLS
1528                 if (preserve_acls && !S_ISLNK(file->mode)) {
1529                         send_acl(f, &sx);
1530                         free_acl(&sx);
1531                 }
1532 #endif
1533 #ifdef SUPPORT_XATTRS
1534                 if (preserve_xattrs) {
1535                         F_XATTR(file) = send_xattr(f, &sx);
1536                         free_xattr(&sx);
1537                 }
1538 #endif
1539         }
1540
1541         maybe_emit_filelist_progress(flist->used + flist_count_offset);
1542
1543         flist_expand(flist, 1);
1544         flist->files[flist->used++] = file;
1545
1546         return file;
1547 }
1548
1549 static void send_if_directory(int f, struct file_list *flist,
1550                               struct file_struct *file,
1551                               char *fbuf, unsigned int ol,
1552                               int flags)
1553 {
1554         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1555
1556         if (S_ISDIR(file->mode)
1557             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1558                 void *save_filters;
1559                 unsigned int len = strlen(fbuf);
1560                 if (len > 1 && fbuf[len-1] == '/')
1561                         fbuf[--len] = '\0';
1562                 save_filters = push_local_filters(fbuf, len);
1563                 send_directory(f, flist, fbuf, len, flags);
1564                 pop_local_filters(save_filters);
1565                 fbuf[ol] = '\0';
1566                 if (is_dot_dir)
1567                         fbuf[ol-1] = '.';
1568         }
1569 }
1570
1571 static int file_compare(const void *file1, const void *file2)
1572 {
1573         return f_name_cmp(*(struct file_struct **)file1,
1574                           *(struct file_struct **)file2);
1575 }
1576
1577 /* The guts of a merge-sort algorithm.  This was derived from the glibc
1578  * version, but I (Wayne) changed the merge code to do less copying and
1579  * to require only half the amount of temporary memory. */
1580 static void fsort_tmp(struct file_struct **fp, size_t num,
1581                       struct file_struct **tmp)
1582 {
1583         struct file_struct **f1, **f2, **t;
1584         size_t n1, n2;
1585
1586         n1 = num / 2;
1587         n2 = num - n1;
1588         f1 = fp;
1589         f2 = fp + n1;
1590
1591         if (n1 > 1)
1592                 fsort_tmp(f1, n1, tmp);
1593         if (n2 > 1)
1594                 fsort_tmp(f2, n2, tmp);
1595
1596         while (f_name_cmp(*f1, *f2) <= 0) {
1597                 if (!--n1)
1598                         return;
1599                 f1++;
1600         }
1601
1602         t = tmp;
1603         memcpy(t, f1, n1 * PTR_SIZE);
1604
1605         *f1++ = *f2++, n2--;
1606
1607         while (n1 > 0 && n2 > 0) {
1608                 if (f_name_cmp(*t, *f2) <= 0)
1609                         *f1++ = *t++, n1--;
1610                 else
1611                         *f1++ = *f2++, n2--;
1612         }
1613
1614         if (n1 > 0)
1615                 memcpy(f1, t, n1 * PTR_SIZE);
1616 }
1617
1618 /* This file-struct sorting routine makes sure that any identical names in
1619  * the file list stay in the same order as they were in the original list.
1620  * This is particularly vital in inc_recurse mode where we expect a sort
1621  * on the flist to match the exact order of a sort on the dir_flist. */
1622 static void fsort(struct file_struct **fp, size_t num)
1623 {
1624         if (num <= 1)
1625                 return;
1626
1627         if (use_qsort)
1628                 qsort(fp, num, PTR_SIZE, file_compare);
1629         else {
1630                 struct file_struct **tmp = new_array(struct file_struct *,
1631                                                      (num+1) / 2);
1632                 fsort_tmp(fp, num, tmp);
1633                 free(tmp);
1634         }
1635 }
1636
1637 /* We take an entire set of sibling dirs from the sorted flist and link them
1638  * into the tree, setting the appropriate parent/child/sibling pointers. */
1639 static void add_dirs_to_tree(int parent_ndx, struct file_list *from_flist,
1640                              int dir_cnt)
1641 {
1642         int i;
1643         int32 *dp = NULL;
1644         int32 *parent_dp = parent_ndx < 0 ? NULL
1645                          : F_DIR_NODE_P(dir_flist->sorted[parent_ndx]);
1646
1647         flist_expand(dir_flist, dir_cnt);
1648         dir_flist->sorted = dir_flist->files;
1649
1650         for (i = 0; dir_cnt; i++) {
1651                 struct file_struct *file = from_flist->sorted[i];
1652
1653                 if (!S_ISDIR(file->mode))
1654                         continue;
1655
1656                 dir_flist->files[dir_flist->used++] = file;
1657                 dir_cnt--;
1658
1659                 if (file->basename[0] == '.' && file->basename[1] == '\0')
1660                         continue;
1661
1662                 if (dp)
1663                         DIR_NEXT_SIBLING(dp) = dir_flist->used - 1;
1664                 else if (parent_dp)
1665                         DIR_FIRST_CHILD(parent_dp) = dir_flist->used - 1;
1666                 else
1667                         send_dir_ndx = dir_flist->used - 1;
1668
1669                 dp = F_DIR_NODE_P(file);
1670                 DIR_PARENT(dp) = parent_ndx;
1671                 DIR_FIRST_CHILD(dp) = -1;
1672         }
1673         if (dp)
1674                 DIR_NEXT_SIBLING(dp) = -1;
1675 }
1676
1677 static void interpret_stat_error(const char *fname, int is_dir)
1678 {
1679         if (errno == ENOENT) {
1680                 io_error |= IOERR_VANISHED;
1681                 rprintf(FWARNING, "%s has vanished: %s\n",
1682                         is_dir ? "directory" : "file", full_fname(fname));
1683         } else {
1684                 io_error |= IOERR_GENERAL;
1685                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
1686                         full_fname(fname));
1687         }
1688 }
1689
1690 /* This function is normally called by the sender, but the receiving side also
1691  * calls it from get_dirlist() with f set to -1 so that we just construct the
1692  * file list in memory without sending it over the wire.  Also, get_dirlist()
1693  * might call this with f set to -2, which also indicates that local filter
1694  * rules should be ignored. */
1695 static void send_directory(int f, struct file_list *flist, char *fbuf, int len,
1696                            int flags)
1697 {
1698         struct dirent *di;
1699         unsigned remainder;
1700         char *p;
1701         DIR *d;
1702         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1703         int start = flist->used;
1704         int filter_level = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1705
1706         assert(flist != NULL);
1707
1708         if (!(d = opendir(fbuf))) {
1709                 if (errno == ENOENT) {
1710                         if (am_sender) /* Can abuse this for vanished error w/ENOENT: */
1711                                 interpret_stat_error(fbuf, True);
1712                         return;
1713                 }
1714                 io_error |= IOERR_GENERAL;
1715                 rsyserr(FERROR_XFER, errno, "opendir %s failed", full_fname(fbuf));
1716                 return;
1717         }
1718
1719         p = fbuf + len;
1720         if (len == 1 && *fbuf == '/')
1721                 remainder = MAXPATHLEN - 1;
1722         else if (len < MAXPATHLEN-1) {
1723                 *p++ = '/';
1724                 *p = '\0';
1725                 remainder = MAXPATHLEN - (len + 1);
1726         } else
1727                 remainder = 0;
1728
1729         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1730                 unsigned name_len;
1731                 char *dname = d_name(di);
1732                 if (dname[0] == '.' && (dname[1] == '\0'
1733                     || (dname[1] == '.' && dname[2] == '\0')))
1734                         continue;
1735                 name_len = strlcpy(p, dname, remainder);
1736                 if (name_len >= remainder) {
1737                         char save = fbuf[len];
1738                         fbuf[len] = '\0';
1739                         io_error |= IOERR_GENERAL;
1740                         rprintf(FERROR_XFER,
1741                                 "filename overflows max-path len by %u: %s/%s\n",
1742                                 name_len - remainder + 1, fbuf, dname);
1743                         fbuf[len] = save;
1744                         continue;
1745                 }
1746                 if (dname[0] == '\0') {
1747                         io_error |= IOERR_GENERAL;
1748                         rprintf(FERROR_XFER,
1749                                 "cannot send file with empty name in %s\n",
1750                                 full_fname(fbuf));
1751                         continue;
1752                 }
1753
1754                 send_file_name(f, flist, fbuf, NULL, flags, filter_level);
1755         }
1756
1757         fbuf[len] = '\0';
1758
1759         if (errno) {
1760                 io_error |= IOERR_GENERAL;
1761                 rsyserr(FERROR_XFER, errno, "readdir(%s)", full_fname(fbuf));
1762         }
1763
1764         closedir(d);
1765
1766         if (f >= 0 && recurse && !divert_dirs) {
1767                 int i, end = flist->used - 1;
1768                 /* send_if_directory() bumps flist->used, so use "end". */
1769                 for (i = start; i <= end; i++)
1770                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1771         }
1772 }
1773
1774 static void send_implied_dirs(int f, struct file_list *flist, char *fname,
1775                               char *start, char *limit, int flags, char name_type)
1776 {
1777         static char lastpath[MAXPATHLEN] = "";
1778         static int lastpath_len = 0;
1779         static struct file_struct *lastpath_struct = NULL;
1780         struct file_struct *file;
1781         item_list *relname_list;
1782         relnamecache **rnpp;
1783         int len, need_new_dir, depth = 0;
1784         filter_rule_list save_filter_list = filter_list;
1785
1786         flags = (flags | FLAG_IMPLIED_DIR) & ~(FLAG_TOP_DIR | FLAG_CONTENT_DIR);
1787         filter_list.head = filter_list.tail = NULL; /* Don't filter implied dirs. */
1788
1789         if (inc_recurse) {
1790                 if (lastpath_struct && F_PATHNAME(lastpath_struct) == pathname
1791                  && lastpath_len == limit - fname
1792                  && strncmp(lastpath, fname, lastpath_len) == 0)
1793                         need_new_dir = 0;
1794                 else
1795                         need_new_dir = 1;
1796         } else {
1797                 char *tp = fname, *lp = lastpath;
1798                 /* Skip any initial directories in our path that we
1799                  * have in common with lastpath. */
1800                 assert(start == fname);
1801                 for ( ; ; tp++, lp++) {
1802                         if (tp == limit) {
1803                                 if (*lp == '/' || *lp == '\0')
1804                                         goto done;
1805                                 break;
1806                         }
1807                         if (*lp != *tp)
1808                                 break;
1809                         if (*tp == '/') {
1810                                 start = tp;
1811                                 depth++;
1812                         }
1813                 }
1814                 need_new_dir = 1;
1815         }
1816
1817         if (need_new_dir) {
1818                 int save_copy_links = copy_links;
1819                 int save_xfer_dirs = xfer_dirs;
1820                 char *slash;
1821
1822                 copy_links = xfer_dirs = 1;
1823
1824                 *limit = '\0';
1825
1826                 for (slash = start; (slash = strchr(slash+1, '/')) != NULL; ) {
1827                         *slash = '\0';
1828                         file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1829                         depth++;
1830                         if (!inc_recurse && file && S_ISDIR(file->mode))
1831                                 change_local_filter_dir(fname, strlen(fname), depth);
1832                         *slash = '/';
1833                 }
1834
1835                 file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1836                 if (inc_recurse) {
1837                         if (file && !S_ISDIR(file->mode))
1838                                 file = NULL;
1839                         lastpath_struct = file;
1840                 } else if (file && S_ISDIR(file->mode))
1841                         change_local_filter_dir(fname, strlen(fname), ++depth);
1842
1843                 strlcpy(lastpath, fname, sizeof lastpath);
1844                 lastpath_len = limit - fname;
1845
1846                 *limit = '/';
1847
1848                 copy_links = save_copy_links;
1849                 xfer_dirs = save_xfer_dirs;
1850
1851                 if (!inc_recurse)
1852                         goto done;
1853         }
1854
1855         if (!lastpath_struct)
1856                 goto done; /* dir must have vanished */
1857
1858         len = strlen(limit+1);
1859         memcpy(&relname_list, F_DIR_RELNAMES_P(lastpath_struct), sizeof relname_list);
1860         if (!relname_list) {
1861                 if (!(relname_list = new0(item_list)))
1862                         out_of_memory("send_implied_dirs");
1863                 memcpy(F_DIR_RELNAMES_P(lastpath_struct), &relname_list, sizeof relname_list);
1864         }
1865         rnpp = EXPAND_ITEM_LIST(relname_list, relnamecache *, 32);
1866         if (!(*rnpp = (relnamecache*)new_array(char, sizeof (relnamecache) + len)))
1867                 out_of_memory("send_implied_dirs");
1868         (*rnpp)->name_type = name_type;
1869         strlcpy((*rnpp)->fname, limit+1, len + 1);
1870
1871 done:
1872         filter_list = save_filter_list;
1873 }
1874
1875 static NORETURN void fatal_unsafe_io_error(void)
1876 {
1877         /* This (sadly) can only happen when pushing data because
1878          * the sender does not know about what kind of delete
1879          * is in effect on the receiving side when pulling. */
1880         rprintf(FERROR_XFER, "FATAL I/O ERROR: dying to avoid a --delete-during issue with a pre-3.0.7 receiver.\n");
1881         exit_cleanup(RERR_UNSUPPORTED);
1882 }
1883
1884 static void send1extra(int f, struct file_struct *file, struct file_list *flist)
1885 {
1886         char fbuf[MAXPATHLEN];
1887         item_list *relname_list;
1888         int len, dlen, flags = FLAG_DIVERT_DIRS | FLAG_CONTENT_DIR;
1889         size_t j;
1890
1891         f_name(file, fbuf);
1892         dlen = strlen(fbuf);
1893
1894         if (!change_pathname(file, NULL, 0))
1895                 exit_cleanup(RERR_FILESELECT);
1896
1897         change_local_filter_dir(fbuf, dlen, send_dir_depth);
1898
1899         if (file->flags & FLAG_CONTENT_DIR) {
1900                 if (one_file_system) {
1901                         STRUCT_STAT st;
1902                         if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1903                                 interpret_stat_error(fbuf, True);
1904                                 return;
1905                         }
1906                         filesystem_dev = st.st_dev;
1907                 }
1908                 send_directory(f, flist, fbuf, dlen, flags);
1909         }
1910
1911         if (!relative_paths)
1912                 return;
1913
1914         memcpy(&relname_list, F_DIR_RELNAMES_P(file), sizeof relname_list);
1915         if (!relname_list)
1916                 return;
1917
1918         for (j = 0; j < relname_list->count; j++) {
1919                 char *slash;
1920                 relnamecache *rnp = ((relnamecache**)relname_list->items)[j];
1921                 char name_type = rnp->name_type;
1922
1923                 fbuf[dlen] = '/';
1924                 len = strlcpy(fbuf + dlen + 1, rnp->fname, sizeof fbuf - dlen - 1);
1925                 free(rnp);
1926                 if (len >= (int)sizeof fbuf)
1927                         continue; /* Impossible... */
1928
1929                 slash = strchr(fbuf+dlen+1, '/');
1930                 if (slash) {
1931                         send_implied_dirs(f, flist, fbuf, fbuf+dlen+1, slash, flags, name_type);
1932                         continue;
1933                 }
1934
1935                 if (name_type != NORMAL_NAME) {
1936                         STRUCT_STAT st;
1937                         if (name_type == MISSING_NAME)
1938                                 memset(&st, 0, sizeof st);
1939                         else if (link_stat(fbuf, &st, 1) != 0) {
1940                                 interpret_stat_error(fbuf, True);
1941                                 continue;
1942                         }
1943                         send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR | flags, ALL_FILTERS);
1944                 } else
1945                         send_file_name(f, flist, fbuf, NULL, FLAG_TOP_DIR | flags, ALL_FILTERS);
1946         }
1947
1948         free(relname_list);
1949 }
1950
1951 void send_extra_file_list(int f, int at_least)
1952 {
1953         struct file_list *flist;
1954         int64 start_write;
1955         uint16 prev_flags;
1956         int save_io_error = io_error;
1957
1958         if (flist_eof)
1959                 return;
1960
1961         if (at_least < 0)
1962                 at_least = file_total - file_old_total + 1;
1963
1964         /* Keep sending data until we have the requested number of
1965          * files in the upcoming file-lists. */
1966         while (file_total - file_old_total < at_least) {
1967                 struct file_struct *file = dir_flist->sorted[send_dir_ndx];
1968                 int dir_ndx, dstart = stats.num_dirs;
1969                 const char *pathname = F_PATHNAME(file);
1970                 int32 *dp;
1971
1972                 flist = flist_new(0, "send_extra_file_list");
1973                 start_write = stats.total_written;
1974
1975                 if (unsort_ndx)
1976                         dir_ndx = F_NDX(file);
1977                 else
1978                         dir_ndx = send_dir_ndx;
1979                 write_ndx(f, NDX_FLIST_OFFSET - dir_ndx);
1980                 flist->parent_ndx = dir_ndx;
1981
1982                 send1extra(f, file, flist);
1983                 prev_flags = file->flags;
1984                 dp = F_DIR_NODE_P(file);
1985
1986                 /* If there are any duplicate directory names that follow, we
1987                  * send all the dirs together in one file-list.  The dir_flist
1988                  * tree links all the child subdirs onto the last dup dir. */
1989                 while ((dir_ndx = DIR_NEXT_SIBLING(dp)) >= 0
1990                     && dir_flist->sorted[dir_ndx]->flags & FLAG_DUPLICATE) {
1991                         send_dir_ndx = dir_ndx;
1992                         file = dir_flist->sorted[dir_ndx];
1993                         /* Try to avoid some duplicate scanning of identical dirs. */
1994                         if (F_PATHNAME(file) == pathname && prev_flags & FLAG_CONTENT_DIR)
1995                                 file->flags &= ~FLAG_CONTENT_DIR;
1996                         send1extra(f, file, flist);
1997                         prev_flags = file->flags;
1998                         dp = F_DIR_NODE_P(file);
1999                 }
2000
2001                 if (io_error == save_io_error || ignore_errors)
2002                         write_byte(f, 0);
2003                 else if (use_safe_inc_flist) {
2004                         write_shortint(f, XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST);
2005                         write_varint(f, io_error);
2006                 } else {
2007                         if (delete_during)
2008                                 fatal_unsafe_io_error();
2009                         write_byte(f, 0);
2010                 }
2011
2012                 if (need_unsorted_flist) {
2013                         if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2014                                 out_of_memory("send_extra_file_list");
2015                         memcpy(flist->sorted, flist->files,
2016                                flist->used * sizeof (struct file_struct*));
2017                 } else
2018                         flist->sorted = flist->files;
2019
2020                 flist_sort_and_clean(flist, 0);
2021
2022                 add_dirs_to_tree(send_dir_ndx, flist, stats.num_dirs - dstart);
2023                 flist_done_allocating(flist);
2024
2025                 file_total += flist->used;
2026                 stats.flist_size += stats.total_written - start_write;
2027                 stats.num_files += flist->used;
2028                 if (DEBUG_GTE(FLIST, 3))
2029                         output_flist(flist);
2030
2031                 if (DIR_FIRST_CHILD(dp) >= 0) {
2032                         send_dir_ndx = DIR_FIRST_CHILD(dp);
2033                         send_dir_depth++;
2034                 } else {
2035                         while (DIR_NEXT_SIBLING(dp) < 0) {
2036                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
2037                                         write_ndx(f, NDX_FLIST_EOF);
2038                                         flist_eof = 1;
2039                                         if (DEBUG_GTE(FLIST, 3))
2040                                                 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2041                                         change_local_filter_dir(NULL, 0, 0);
2042                                         goto finish;
2043                                 }
2044                                 send_dir_depth--;
2045                                 file = dir_flist->sorted[send_dir_ndx];
2046                                 dp = F_DIR_NODE_P(file);
2047                         }
2048                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
2049                 }
2050         }
2051
2052   finish:
2053         if (io_error != save_io_error && protocol_version == 30 && !ignore_errors)
2054                 send_msg_int(MSG_IO_ERROR, io_error);
2055 }
2056
2057 struct file_list *send_file_list(int f, int argc, char *argv[])
2058 {
2059         static const char *lastdir;
2060         static int lastdir_len = -1;
2061         int len, dirlen;
2062         STRUCT_STAT st;
2063         char *p, *dir;
2064         struct file_list *flist;
2065         struct timeval start_tv, end_tv;
2066         int64 start_write;
2067         int use_ff_fd = 0;
2068         int disable_buffering, reenable_multiplex = -1;
2069         int flags = recurse ? FLAG_CONTENT_DIR : 0;
2070         int reading_remotely = filesfrom_host != NULL;
2071         int rl_flags = (reading_remotely ? 0 : RL_DUMP_COMMENTS)
2072 #ifdef ICONV_OPTION
2073                      | (filesfrom_convert ? RL_CONVERT : 0)
2074 #endif
2075                      | (eol_nulls || reading_remotely ? RL_EOL_NULLS : 0);
2076         int implied_dot_dir = 0;
2077
2078         rprintf(FLOG, "building file list\n");
2079         if (show_filelist_p())
2080                 start_filelist_progress("building file list");
2081         else if (inc_recurse && INFO_GTE(FLIST, 1) && !am_server)
2082                 rprintf(FCLIENT, "sending incremental file list\n");
2083
2084         start_write = stats.total_written;
2085         gettimeofday(&start_tv, NULL);
2086
2087         if (relative_paths && protocol_version >= 30)
2088                 implied_dirs = 1; /* We send flagged implied dirs */
2089
2090 #ifdef SUPPORT_HARD_LINKS
2091         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
2092                 init_hard_links();
2093 #endif
2094
2095         flist = cur_flist = flist_new(0, "send_file_list");
2096         if (inc_recurse) {
2097                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
2098                 flags |= FLAG_DIVERT_DIRS;
2099         } else
2100                 dir_flist = cur_flist;
2101
2102         disable_buffering = io_start_buffering_out(f);
2103         if (filesfrom_fd >= 0) {
2104                 if (argv[0] && !change_dir(argv[0], CD_NORMAL)) {
2105                         rsyserr(FERROR_XFER, errno, "change_dir %s failed",
2106                                 full_fname(argv[0]));
2107                         exit_cleanup(RERR_FILESELECT);
2108                 }
2109                 if (protocol_version < 31) {
2110                         /* Older protocols send the files-from data w/o packaging
2111                          * it in multiplexed I/O packets, so temporarily switch
2112                          * to buffered I/O to match this behavior. */
2113                         reenable_multiplex = io_end_multiplex_in(MPLX_TO_BUFFERED);
2114                 }
2115                 use_ff_fd = 1;
2116         }
2117
2118         if (!orig_dir)
2119                 orig_dir = strdup(curr_dir);
2120
2121         while (1) {
2122                 char fbuf[MAXPATHLEN], *fn, name_type;
2123
2124                 if (use_ff_fd) {
2125                         if (read_line(filesfrom_fd, fbuf, sizeof fbuf, rl_flags) == 0)
2126                                 break;
2127                         sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
2128                 } else {
2129                         if (argc-- == 0)
2130                                 break;
2131                         strlcpy(fbuf, *argv++, MAXPATHLEN);
2132                         if (sanitize_paths)
2133                                 sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
2134                 }
2135
2136                 len = strlen(fbuf);
2137                 if (relative_paths) {
2138                         /* We clean up fbuf below. */
2139                         name_type = NORMAL_NAME;
2140                 } else if (!len || fbuf[len - 1] == '/') {
2141                         if (len == 2 && fbuf[0] == '.') {
2142                                 /* Turn "./" into just "." rather than "./." */
2143                                 fbuf[--len] = '\0';
2144                         } else {
2145                                 if (len + 1 >= MAXPATHLEN)
2146                                         overflow_exit("send_file_list");
2147                                 fbuf[len++] = '.';
2148                                 fbuf[len] = '\0';
2149                         }
2150                         name_type = DOTDIR_NAME;
2151                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
2152                     && (len == 2 || fbuf[len-3] == '/')) {
2153                         if (len + 2 >= MAXPATHLEN)
2154                                 overflow_exit("send_file_list");
2155                         fbuf[len++] = '/';
2156                         fbuf[len++] = '.';
2157                         fbuf[len] = '\0';
2158                         name_type = DOTDIR_NAME;
2159                 } else if (fbuf[len-1] == '.' && (len == 1 || fbuf[len-2] == '/'))
2160                         name_type = DOTDIR_NAME;
2161                 else
2162                         name_type = NORMAL_NAME;
2163
2164                 dir = NULL;
2165
2166                 if (!relative_paths) {
2167                         p = strrchr(fbuf, '/');
2168                         if (p) {
2169                                 *p = '\0';
2170                                 if (p == fbuf)
2171                                         dir = "/";
2172                                 else
2173                                         dir = fbuf;
2174                                 len -= p - fbuf + 1;
2175                                 fn = p + 1;
2176                         } else
2177                                 fn = fbuf;
2178                 } else {
2179                         if ((p = strstr(fbuf, "/./")) != NULL) {
2180                                 *p = '\0';
2181                                 if (p == fbuf)
2182                                         dir = "/";
2183                                 else {
2184                                         dir = fbuf;
2185                                         clean_fname(dir, 0);
2186                                 }
2187                                 fn = p + 3;
2188                                 while (*fn == '/')
2189                                         fn++;
2190                                 if (!*fn)
2191                                         *--fn = '\0'; /* ensure room for '.' */
2192                         } else
2193                                 fn = fbuf;
2194                         /* A leading ./ can be used in relative mode to affect
2195                          * the dest dir without its name being in the path. */
2196                         if (*fn == '.' && fn[1] == '/' && fn[2] && !implied_dot_dir)
2197                                 implied_dot_dir = -1;
2198                         len = clean_fname(fn, CFN_KEEP_TRAILING_SLASH
2199                                             | CFN_DROP_TRAILING_DOT_DIR);
2200                         if (len == 1) {
2201                                 if (fn[0] == '/') {
2202                                         fn = "/.";
2203                                         len = 2;
2204                                         name_type = DOTDIR_NAME;
2205                                 } else if (fn[0] == '.')
2206                                         name_type = DOTDIR_NAME;
2207                         } else if (fn[len-1] == '/') {
2208                                 fn[--len] = '\0';
2209                                 if (len == 1 && *fn == '.')
2210                                         name_type = DOTDIR_NAME;
2211                                 else
2212                                         name_type = SLASH_ENDING_NAME;
2213                         }
2214                         /* Reject a ".." dir in the active part of the path. */
2215                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
2216                                 if ((p[2] == '/' || p[2] == '\0')
2217                                  && (p == fn || p[-1] == '/')) {
2218                                         rprintf(FERROR,
2219                                             "found \"..\" dir in relative path: %s\n",
2220                                             fn);
2221                                         exit_cleanup(RERR_SYNTAX);
2222                                 }
2223                         }
2224                 }
2225
2226                 if (!*fn) {
2227                         len = 1;
2228                         fn = ".";
2229                         name_type = DOTDIR_NAME;
2230                 }
2231
2232                 dirlen = dir ? strlen(dir) : 0;
2233                 if (dirlen != lastdir_len || memcmp(lastdir, dir, dirlen) != 0) {
2234                         if (!change_pathname(NULL, dir, -dirlen))
2235                                 goto bad_path;
2236                         lastdir = pathname;
2237                         lastdir_len = pathname_len;
2238                 } else if (!change_pathname(NULL, lastdir, lastdir_len)) {
2239                     bad_path:
2240                         if (implied_dot_dir < 0)
2241                                 implied_dot_dir = 0;
2242                         continue;
2243                 }
2244
2245                 if (implied_dot_dir < 0) {
2246                         implied_dot_dir = 1;
2247                         send_file_name(f, flist, ".", NULL, (flags | FLAG_IMPLIED_DIR) & ~FLAG_CONTENT_DIR, ALL_FILTERS);
2248                 }
2249
2250                 if (fn != fbuf)
2251                         memmove(fbuf, fn, len + 1);
2252
2253                 if (link_stat(fbuf, &st, copy_dirlinks || name_type != NORMAL_NAME) != 0
2254                  || (name_type != DOTDIR_NAME && is_daemon_excluded(fbuf, S_ISDIR(st.st_mode)))
2255                  || (relative_paths && path_is_daemon_excluded(fbuf, 1))) {
2256                         if (errno != ENOENT || missing_args == 0) {
2257                                 /* This is a transfer error, but inhibit deletion
2258                                  * only if we might be omitting an existing file. */
2259                                 if (errno != ENOENT)
2260                                         io_error |= IOERR_GENERAL;
2261                                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
2262                                         full_fname(fbuf));
2263                                 continue;
2264                         } else if (missing_args == 1) {
2265                                 /* Just ignore the arg. */
2266                                 continue;
2267                         } else /* (missing_args == 2) */ {
2268                                 /* Send the arg as a "missing" entry with
2269                                  * mode 0, which tells the generator to delete it. */
2270                                 memset(&st, 0, sizeof st);
2271                         }
2272                 }
2273
2274                 /* A dot-dir should not be excluded! */
2275                 if (name_type != DOTDIR_NAME && st.st_mode != 0
2276                  && is_excluded(fbuf, S_ISDIR(st.st_mode) != 0, ALL_FILTERS))
2277                         continue;
2278
2279                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
2280                         rprintf(FINFO, "skipping directory %s\n", fbuf);
2281                         continue;
2282                 }
2283
2284                 if (inc_recurse && relative_paths && *fbuf) {
2285                         if ((p = strchr(fbuf+1, '/')) != NULL) {
2286                                 if (p - fbuf == 1 && *fbuf == '.') {
2287                                         if ((fn = strchr(p+1, '/')) != NULL)
2288                                                 p = fn;
2289                                 } else
2290                                         fn = p;
2291                                 send_implied_dirs(f, flist, fbuf, fbuf, p, flags,
2292                                                   st.st_mode == 0 ? MISSING_NAME : name_type);
2293                                 if (fn == p)
2294                                         continue;
2295                         }
2296                 } else if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
2297                         /* Send the implied directories at the start of the
2298                          * source spec, so we get their permissions right. */
2299                         send_implied_dirs(f, flist, fbuf, fbuf, p, flags, 0);
2300                 }
2301
2302                 if (one_file_system)
2303                         filesystem_dev = st.st_dev;
2304
2305                 if (recurse || (xfer_dirs && name_type != NORMAL_NAME)) {
2306                         struct file_struct *file;
2307                         file = send_file_name(f, flist, fbuf, &st,
2308                                               FLAG_TOP_DIR | FLAG_CONTENT_DIR | flags,
2309                                               NO_FILTERS);
2310                         if (!file)
2311                                 continue;
2312                         if (inc_recurse) {
2313                                 if (name_type == DOTDIR_NAME) {
2314                                         if (send_dir_depth < 0) {
2315                                                 send_dir_depth = 0;
2316                                                 change_local_filter_dir(fbuf, len, send_dir_depth);
2317                                         }
2318                                         send_directory(f, flist, fbuf, len, flags);
2319                                 }
2320                         } else
2321                                 send_if_directory(f, flist, file, fbuf, len, flags);
2322                 } else
2323                         send_file_name(f, flist, fbuf, &st, flags, NO_FILTERS);
2324         }
2325
2326         if (reenable_multiplex >= 0)
2327                 io_start_multiplex_in(reenable_multiplex);
2328
2329         gettimeofday(&end_tv, NULL);
2330         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2331                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2332         if (stats.flist_buildtime == 0)
2333                 stats.flist_buildtime = 1;
2334         start_tv = end_tv;
2335
2336         /* Indicate end of file list */
2337         if (io_error == 0 || ignore_errors)
2338                 write_byte(f, 0);
2339         else if (use_safe_inc_flist) {
2340                 write_shortint(f, XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST);
2341                 write_varint(f, io_error);
2342         } else {
2343                 if (delete_during && inc_recurse)
2344                         fatal_unsafe_io_error();
2345                 write_byte(f, 0);
2346         }
2347
2348 #ifdef SUPPORT_HARD_LINKS
2349         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
2350                 idev_destroy();
2351 #endif
2352
2353         if (show_filelist_p())
2354                 finish_filelist_progress(flist);
2355
2356         gettimeofday(&end_tv, NULL);
2357         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2358                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2359
2360         /* When converting names, both sides keep an unsorted file-list array
2361          * because the names will differ on the sending and receiving sides
2362          * (both sides will use the unsorted index number for each item). */
2363
2364         /* Sort the list without removing any duplicates.  This allows the
2365          * receiving side to ask for whatever name it kept.  For incremental
2366          * recursion mode, the sender marks duplicate dirs so that it can
2367          * send them together in a single file-list. */
2368         if (need_unsorted_flist) {
2369                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2370                         out_of_memory("send_file_list");
2371                 memcpy(flist->sorted, flist->files,
2372                        flist->used * sizeof (struct file_struct*));
2373         } else
2374                 flist->sorted = flist->files;
2375         flist_sort_and_clean(flist, 0);
2376         file_total += flist->used;
2377         file_old_total += flist->used;
2378
2379         if (numeric_ids <= 0 && !inc_recurse)
2380                 send_id_list(f);
2381
2382         /* send the io_error flag */
2383         if (protocol_version < 30)
2384                 write_int(f, ignore_errors ? 0 : io_error);
2385         else if (!use_safe_inc_flist && io_error && !ignore_errors)
2386                 send_msg_int(MSG_IO_ERROR, io_error);
2387
2388         if (disable_buffering)
2389                 io_end_buffering_out(IOBUF_FREE_BUFS);
2390
2391         stats.flist_size = stats.total_written - start_write;
2392         stats.num_files = flist->used;
2393
2394         if (DEBUG_GTE(FLIST, 3))
2395                 output_flist(flist);
2396
2397         if (DEBUG_GTE(FLIST, 2))
2398                 rprintf(FINFO, "send_file_list done\n");
2399
2400         if (inc_recurse) {
2401                 send_dir_depth = 1;
2402                 add_dirs_to_tree(-1, flist, stats.num_dirs);
2403                 if (!file_total || strcmp(flist->sorted[flist->low]->basename, ".") != 0)
2404                         flist->parent_ndx = -1;
2405                 flist_done_allocating(flist);
2406                 if (send_dir_ndx < 0) {
2407                         write_ndx(f, NDX_FLIST_EOF);
2408                         flist_eof = 1;
2409                         if (DEBUG_GTE(FLIST, 3))
2410                                 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2411                 }
2412                 else if (file_total == 1) {
2413                         /* If we're creating incremental file-lists and there
2414                          * was just 1 item in the first file-list, send 1 more
2415                          * file-list to check if this is a 1-file xfer. */
2416                         send_extra_file_list(f, 1);
2417                 }
2418         } else {
2419                 flist_eof = 1;
2420                 if (DEBUG_GTE(FLIST, 3))
2421                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2422         }
2423
2424         return flist;
2425 }
2426
2427 struct file_list *recv_file_list(int f)
2428 {
2429         struct file_list *flist;
2430         int dstart, flags;
2431         int64 start_read;
2432
2433         if (!first_flist) {
2434                 if (show_filelist_p())
2435                         start_filelist_progress("receiving file list");
2436                 else if (inc_recurse && INFO_GTE(FLIST, 1) && !am_server)
2437                         rprintf(FCLIENT, "receiving incremental file list\n");
2438                 rprintf(FLOG, "receiving file list\n");
2439                 if (usermap)
2440                         parse_name_map(usermap, True);
2441                 if (groupmap)
2442                         parse_name_map(groupmap, False);
2443         }
2444
2445         start_read = stats.total_read;
2446
2447 #ifdef SUPPORT_HARD_LINKS
2448         if (preserve_hard_links && !first_flist)
2449                 init_hard_links();
2450 #endif
2451
2452         flist = flist_new(0, "recv_file_list");
2453
2454         if (inc_recurse) {
2455                 if (flist->ndx_start == 1)
2456                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
2457                 dstart = dir_flist->used;
2458         } else {
2459                 dir_flist = flist;
2460                 dstart = 0;
2461         }
2462
2463         while ((flags = read_byte(f)) != 0) {
2464                 struct file_struct *file;
2465
2466                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
2467                         flags |= read_byte(f) << 8;
2468
2469                 if (flags == (XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST)) {
2470                         int err;
2471                         if (!use_safe_inc_flist) {
2472                                 rprintf(FERROR, "Invalid flist flag: %x\n", flags);
2473                                 exit_cleanup(RERR_PROTOCOL);
2474                         }
2475                         err = read_varint(f);
2476                         if (!ignore_errors)
2477                                 io_error |= err;
2478                         break;
2479                 }
2480
2481                 flist_expand(flist, 1);
2482                 file = recv_file_entry(f, flist, flags);
2483
2484                 if (S_ISREG(file->mode)) {
2485                         /* Already counted */
2486                 } else if (S_ISDIR(file->mode)) {
2487                         if (inc_recurse) {
2488                                 flist_expand(dir_flist, 1);
2489                                 dir_flist->files[dir_flist->used++] = file;
2490                         }
2491                         stats.num_dirs++;
2492                 } else if (S_ISLNK(file->mode))
2493                         stats.num_symlinks++;
2494                 else if (IS_DEVICE(file->mode))
2495                         stats.num_symlinks++;
2496                 else
2497                         stats.num_specials++;
2498
2499                 flist->files[flist->used++] = file;
2500
2501                 maybe_emit_filelist_progress(flist->used);
2502
2503                 if (DEBUG_GTE(FLIST, 2)) {
2504                         char *name = f_name(file, NULL);
2505                         rprintf(FINFO, "recv_file_name(%s)\n", NS(name));
2506                 }
2507         }
2508         file_total += flist->used;
2509
2510         if (DEBUG_GTE(FLIST, 2))
2511                 rprintf(FINFO, "received %d names\n", flist->used);
2512
2513         if (show_filelist_p())
2514                 finish_filelist_progress(flist);
2515
2516         if (need_unsorted_flist) {
2517                 /* Create an extra array of index pointers that we can sort for
2518                  * the generator's use (for wading through the files in sorted
2519                  * order and for calling flist_find()).  We keep the "files"
2520                  * list unsorted for our exchange of index numbers with the
2521                  * other side (since their names may not sort the same). */
2522                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2523                         out_of_memory("recv_file_list");
2524                 memcpy(flist->sorted, flist->files,
2525                        flist->used * sizeof (struct file_struct*));
2526                 if (inc_recurse && dir_flist->used > dstart) {
2527                         static int dir_flist_malloced = 0;
2528                         if (dir_flist_malloced < dir_flist->malloced) {
2529                                 dir_flist->sorted = realloc_array(dir_flist->sorted,
2530                                                         struct file_struct *,
2531                                                         dir_flist->malloced);
2532                                 dir_flist_malloced = dir_flist->malloced;
2533                         }
2534                         memcpy(dir_flist->sorted + dstart, dir_flist->files + dstart,
2535                                (dir_flist->used - dstart) * sizeof (struct file_struct*));
2536                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2537                 }
2538         } else {
2539                 flist->sorted = flist->files;
2540                 if (inc_recurse && dir_flist->used > dstart) {
2541                         dir_flist->sorted = dir_flist->files;
2542                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2543                 }
2544         }
2545
2546         if (inc_recurse)
2547                 flist_done_allocating(flist);
2548         else if (f >= 0) {
2549                 recv_id_list(f, flist);
2550                 flist_eof = 1;
2551                 if (DEBUG_GTE(FLIST, 3))
2552                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2553         }
2554
2555         flist_sort_and_clean(flist, relative_paths);
2556
2557         if (protocol_version < 30) {
2558                 /* Recv the io_error flag */
2559                 int err = read_int(f);
2560                 if (!ignore_errors)
2561                         io_error |= err;
2562         } else if (inc_recurse && flist->ndx_start == 1) {
2563                 if (!file_total || strcmp(flist->sorted[flist->low]->basename, ".") != 0)
2564                         flist->parent_ndx = -1;
2565         }
2566
2567         if (DEBUG_GTE(FLIST, 3))
2568                 output_flist(flist);
2569
2570         if (DEBUG_GTE(FLIST, 2))
2571                 rprintf(FINFO, "recv_file_list done\n");
2572
2573         stats.flist_size += stats.total_read - start_read;
2574         stats.num_files += flist->used;
2575
2576         return flist;
2577 }
2578
2579 /* This is only used once by the receiver if the very first file-list
2580  * has exactly one item in it. */
2581 void recv_additional_file_list(int f)
2582 {
2583         struct file_list *flist;
2584         int ndx = read_ndx(f);
2585         if (ndx == NDX_FLIST_EOF) {
2586                 flist_eof = 1;
2587                 if (DEBUG_GTE(FLIST, 3))
2588                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2589                 change_local_filter_dir(NULL, 0, 0);
2590         } else {
2591                 ndx = NDX_FLIST_OFFSET - ndx;
2592                 if (ndx < 0 || ndx >= dir_flist->used) {
2593                         ndx = NDX_FLIST_OFFSET - ndx;
2594                         rprintf(FERROR,
2595                                 "[%s] Invalid dir index: %d (%d - %d)\n",
2596                                 who_am_i(), ndx, NDX_FLIST_OFFSET,
2597                                 NDX_FLIST_OFFSET - dir_flist->used + 1);
2598                         exit_cleanup(RERR_PROTOCOL);
2599                 }
2600                 if (DEBUG_GTE(FLIST, 3)) {
2601                         rprintf(FINFO, "[%s] receiving flist for dir %d\n",
2602                                 who_am_i(), ndx);
2603                 }
2604                 flist = recv_file_list(f);
2605                 flist->parent_ndx = ndx;
2606         }
2607 }
2608
2609 /* Search for an identically-named item in the file list.  Note that the
2610  * items must agree in their directory-ness, or no match is returned. */
2611 int flist_find(struct file_list *flist, struct file_struct *f)
2612 {
2613         int low = flist->low, high = flist->high;
2614         int diff, mid, mid_up;
2615
2616         while (low <= high) {
2617                 mid = (low + high) / 2;
2618                 if (F_IS_ACTIVE(flist->sorted[mid]))
2619                         mid_up = mid;
2620                 else {
2621                         /* Scan for the next non-empty entry using the cached
2622                          * distance values.  If the value isn't fully up-to-
2623                          * date, update it. */
2624                         mid_up = mid + F_DEPTH(flist->sorted[mid]);
2625                         if (!F_IS_ACTIVE(flist->sorted[mid_up])) {
2626                                 do {
2627                                     mid_up += F_DEPTH(flist->sorted[mid_up]);
2628                                 } while (!F_IS_ACTIVE(flist->sorted[mid_up]));
2629                                 F_DEPTH(flist->sorted[mid]) = mid_up - mid;
2630                         }
2631                         if (mid_up > high) {
2632                                 /* If there's nothing left above us, set high to
2633                                  * a non-empty entry below us and continue. */
2634                                 high = mid - (int)flist->sorted[mid]->len32;
2635                                 if (!F_IS_ACTIVE(flist->sorted[high])) {
2636                                         do {
2637                                             high -= (int)flist->sorted[high]->len32;
2638                                         } while (!F_IS_ACTIVE(flist->sorted[high]));
2639                                         flist->sorted[mid]->len32 = mid - high;
2640                                 }
2641                                 continue;
2642                         }
2643                 }
2644                 diff = f_name_cmp(flist->sorted[mid_up], f);
2645                 if (diff == 0) {
2646                         if (protocol_version < 29
2647                             && S_ISDIR(flist->sorted[mid_up]->mode)
2648                             != S_ISDIR(f->mode))
2649                                 return -1;
2650                         return mid_up;
2651                 }
2652                 if (diff < 0)
2653                         low = mid_up + 1;
2654                 else
2655                         high = mid - 1;
2656         }
2657         return -1;
2658 }
2659
2660 /* Search for an identically-named item in the file list.  Differs from
2661  * flist_find in that an item that agrees with "f" in directory-ness is
2662  * preferred but one that does not is still found. */
2663 int flist_find_ignore_dirness(struct file_list *flist, struct file_struct *f)
2664 {
2665         mode_t save_mode;
2666         int ndx;
2667
2668         /* First look for an item that agrees in directory-ness. */
2669         ndx = flist_find(flist, f);
2670         if (ndx >= 0)
2671                 return ndx;
2672
2673         /* Temporarily flip f->mode to look for an item of opposite
2674          * directory-ness. */
2675         save_mode = f->mode;
2676         f->mode = S_ISDIR(f->mode) ? S_IFREG : S_IFDIR;
2677         ndx = flist_find(flist, f);
2678         f->mode = save_mode;
2679         return ndx;
2680 }
2681
2682 /*
2683  * Free up any resources a file_struct has allocated
2684  * and clear the file.
2685  */
2686 void clear_file(struct file_struct *file)
2687 {
2688         /* The +1 zeros out the first char of the basename. */
2689         memset(file, 0, FILE_STRUCT_LEN + 1);
2690         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
2691          * entry.  Likewise for len32 in the opposite direction.  We assume
2692          * that we're alone for now since flist_find() will adjust the counts
2693          * it runs into that aren't up-to-date. */
2694         file->len32 = F_DEPTH(file) = 1;
2695 }
2696
2697 /* Allocate a new file list. */
2698 struct file_list *flist_new(int flags, char *msg)
2699 {
2700         struct file_list *flist;
2701
2702         if (!(flist = new0(struct file_list)))
2703                 out_of_memory(msg);
2704
2705         if (flags & FLIST_TEMP) {
2706                 if (!(flist->file_pool = pool_create(SMALL_EXTENT, 0,
2707                                                      out_of_memory,
2708                                                      POOL_INTERN)))
2709                         out_of_memory(msg);
2710         } else {
2711                 /* This is a doubly linked list with prev looping back to
2712                  * the end of the list, but the last next pointer is NULL. */
2713                 if (!first_flist) {
2714                         flist->file_pool = pool_create(NORMAL_EXTENT, 0,
2715                                                        out_of_memory,
2716                                                        POOL_INTERN);
2717                         if (!flist->file_pool)
2718                                 out_of_memory(msg);
2719
2720                         flist->ndx_start = flist->flist_num = inc_recurse ? 1 : 0;
2721
2722                         first_flist = cur_flist = flist->prev = flist;
2723                 } else {
2724                         struct file_list *prev = first_flist->prev;
2725
2726                         flist->file_pool = first_flist->file_pool;
2727
2728                         flist->ndx_start = prev->ndx_start + prev->used + 1;
2729                         flist->flist_num = prev->flist_num + 1;
2730
2731                         flist->prev = prev;
2732                         prev->next = first_flist->prev = flist;
2733                 }
2734                 flist->pool_boundary = pool_boundary(flist->file_pool, 0);
2735                 flist_cnt++;
2736         }
2737
2738         return flist;
2739 }
2740
2741 /* Free up all elements in a flist. */
2742 void flist_free(struct file_list *flist)
2743 {
2744         if (!flist->prev) {
2745                 /* Was FLIST_TEMP dir-list. */
2746         } else if (flist == flist->prev) {
2747                 first_flist = cur_flist = NULL;
2748                 file_total = 0;
2749                 flist_cnt = 0;
2750         } else {
2751                 if (flist == cur_flist)
2752                         cur_flist = flist->next;
2753                 if (flist == first_flist)
2754                         first_flist = first_flist->next;
2755                 else {
2756                         flist->prev->next = flist->next;
2757                         if (!flist->next)
2758                                 flist->next = first_flist;
2759                 }
2760                 flist->next->prev = flist->prev;
2761                 file_total -= flist->used;
2762                 flist_cnt--;
2763         }
2764
2765         if (!flist->prev || !flist_cnt)
2766                 pool_destroy(flist->file_pool);
2767         else
2768                 pool_free_old(flist->file_pool, flist->pool_boundary);
2769
2770         if (flist->sorted && flist->sorted != flist->files)
2771                 free(flist->sorted);
2772         free(flist->files);
2773         free(flist);
2774 }
2775
2776 /* This routine ensures we don't have any duplicate names in our file list.
2777  * duplicate names can cause corruption because of the pipelining. */
2778 static void flist_sort_and_clean(struct file_list *flist, int strip_root)
2779 {
2780         char fbuf[MAXPATHLEN];
2781         int i, prev_i;
2782
2783         if (!flist)
2784                 return;
2785         if (flist->used == 0) {
2786                 flist->high = -1;
2787                 flist->low = 0;
2788                 return;
2789         }
2790
2791         fsort(flist->sorted, flist->used);
2792
2793         if (!am_sender || inc_recurse) {
2794                 for (i = prev_i = 0; i < flist->used; i++) {
2795                         if (F_IS_ACTIVE(flist->sorted[i])) {
2796                                 prev_i = i;
2797                                 break;
2798                         }
2799                 }
2800                 flist->low = prev_i;
2801         } else {
2802                 i = prev_i = flist->used - 1;
2803                 flist->low = 0;
2804         }
2805
2806         while (++i < flist->used) {
2807                 int j;
2808                 struct file_struct *file = flist->sorted[i];
2809
2810                 if (!F_IS_ACTIVE(file))
2811                         continue;
2812                 if (f_name_cmp(file, flist->sorted[prev_i]) == 0)
2813                         j = prev_i;
2814                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
2815                         int save_mode = file->mode;
2816                         /* Make sure that this directory doesn't duplicate a
2817                          * non-directory earlier in the list. */
2818                         flist->high = prev_i;
2819                         file->mode = S_IFREG;
2820                         j = flist_find(flist, file);
2821                         file->mode = save_mode;
2822                 } else
2823                         j = -1;
2824                 if (j >= 0) {
2825                         int keep, drop;
2826                         /* If one is a dir and the other is not, we want to
2827                          * keep the dir because it might have contents in the
2828                          * list.  Otherwise keep the first one. */
2829                         if (S_ISDIR(file->mode)) {
2830                                 struct file_struct *fp = flist->sorted[j];
2831                                 if (!S_ISDIR(fp->mode))
2832                                         keep = i, drop = j;
2833                                 else {
2834                                         if (am_sender)
2835                                                 file->flags |= FLAG_DUPLICATE;
2836                                         else { /* Make sure we merge our vital flags. */
2837                                                 fp->flags |= file->flags & (FLAG_TOP_DIR|FLAG_CONTENT_DIR);
2838                                                 fp->flags &= file->flags | ~FLAG_IMPLIED_DIR;
2839                                         }
2840                                         keep = j, drop = i;
2841                                 }
2842                         } else
2843                                 keep = j, drop = i;
2844
2845                         if (!am_sender) {
2846                                 if (DEBUG_GTE(DUP, 1)) {
2847                                         rprintf(FINFO,
2848                                             "removing duplicate name %s from file list (%d)\n",
2849                                             f_name(file, fbuf), drop + flist->ndx_start);
2850                                 }
2851                                 clear_file(flist->sorted[drop]);
2852                         }
2853
2854                         if (keep == i) {
2855                                 if (flist->low == drop) {
2856                                         for (j = drop + 1;
2857                                              j < i && !F_IS_ACTIVE(flist->sorted[j]);
2858                                              j++) {}
2859                                         flist->low = j;
2860                                 }
2861                                 prev_i = i;
2862                         }
2863                 } else
2864                         prev_i = i;
2865         }
2866         flist->high = prev_i;
2867
2868         if (strip_root) {
2869                 /* We need to strip off the leading slashes for relative
2870                  * paths, but this must be done _after_ the sorting phase. */
2871                 for (i = flist->low; i <= flist->high; i++) {
2872                         struct file_struct *file = flist->sorted[i];
2873
2874                         if (!file->dirname)
2875                                 continue;
2876                         while (*file->dirname == '/')
2877                                 file->dirname++;
2878                         if (!*file->dirname)
2879                                 file->dirname = NULL;
2880                 }
2881         }
2882
2883         if (prune_empty_dirs && !am_sender) {
2884                 int j, prev_depth = 0;
2885
2886                 prev_i = 0; /* It's OK that this isn't really true. */
2887
2888                 for (i = flist->low; i <= flist->high; i++) {
2889                         struct file_struct *fp, *file = flist->sorted[i];
2890
2891                         /* This temporarily abuses the F_DEPTH() value for a
2892                          * directory that is in a chain that might get pruned.
2893                          * We restore the old value if it gets a reprieve. */
2894                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2895                                 /* Dump empty dirs when coming back down. */
2896                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2897                                         fp = flist->sorted[prev_i];
2898                                         if (F_DEPTH(fp) >= 0)
2899                                                 break;
2900                                         prev_i = -F_DEPTH(fp)-1;
2901                                         clear_file(fp);
2902                                 }
2903                                 prev_depth = F_DEPTH(file);
2904                                 if (is_excluded(f_name(file, fbuf), 1,
2905                                                        ALL_FILTERS)) {
2906                                         /* Keep dirs through this dir. */
2907                                         for (j = prev_depth-1; ; j--) {
2908                                                 fp = flist->sorted[prev_i];
2909                                                 if (F_DEPTH(fp) >= 0)
2910                                                         break;
2911                                                 prev_i = -F_DEPTH(fp)-1;
2912                                                 F_DEPTH(fp) = j;
2913                                         }
2914                                 } else
2915                                         F_DEPTH(file) = -prev_i-1;
2916                                 prev_i = i;
2917                         } else {
2918                                 /* Keep dirs through this non-dir. */
2919                                 for (j = prev_depth; ; j--) {
2920                                         fp = flist->sorted[prev_i];
2921                                         if (F_DEPTH(fp) >= 0)
2922                                                 break;
2923                                         prev_i = -F_DEPTH(fp)-1;
2924                                         F_DEPTH(fp) = j;
2925                                 }
2926                         }
2927                 }
2928                 /* Dump all remaining empty dirs. */
2929                 while (1) {
2930                         struct file_struct *fp = flist->sorted[prev_i];
2931                         if (F_DEPTH(fp) >= 0)
2932                                 break;
2933                         prev_i = -F_DEPTH(fp)-1;
2934                         clear_file(fp);
2935                 }
2936
2937                 for (i = flist->low; i <= flist->high; i++) {
2938                         if (F_IS_ACTIVE(flist->sorted[i]))
2939                                 break;
2940                 }
2941                 flist->low = i;
2942                 for (i = flist->high; i >= flist->low; i--) {
2943                         if (F_IS_ACTIVE(flist->sorted[i]))
2944                                 break;
2945                 }
2946                 flist->high = i;
2947         }
2948 }
2949
2950 static void output_flist(struct file_list *flist)
2951 {
2952         char uidbuf[16], gidbuf[16], depthbuf[16];
2953         struct file_struct *file;
2954         const char *root, *dir, *slash, *name, *trail;
2955         const char *who = who_am_i();
2956         int i;
2957
2958         rprintf(FINFO, "[%s] flist start=%d, used=%d, low=%d, high=%d\n",
2959                 who, flist->ndx_start, flist->used, flist->low, flist->high);
2960         for (i = 0; i < flist->used; i++) {
2961                 file = flist->files[i];
2962                 if ((am_root || am_sender) && uid_ndx) {
2963                         snprintf(uidbuf, sizeof uidbuf, " uid=%u",
2964                                  F_OWNER(file));
2965                 } else
2966                         *uidbuf = '\0';
2967                 if (gid_ndx) {
2968                         static char parens[] = "(\0)\0\0\0";
2969                         char *pp = parens + (file->flags & FLAG_SKIP_GROUP ? 0 : 3);
2970                         snprintf(gidbuf, sizeof gidbuf, " gid=%s%u%s",
2971                                  pp, F_GROUP(file), pp + 2);
2972                 } else
2973                         *gidbuf = '\0';
2974                 if (!am_sender)
2975                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2976                 if (F_IS_ACTIVE(file)) {
2977                         root = am_sender ? NS(F_PATHNAME(file)) : depthbuf;
2978                         if ((dir = file->dirname) == NULL)
2979                                 dir = slash = "";
2980                         else
2981                                 slash = "/";
2982                         name = file->basename;
2983                         trail = S_ISDIR(file->mode) ? "/" : "";
2984                 } else
2985                         root = dir = slash = name = trail = "";
2986                 rprintf(FINFO,
2987                         "[%s] i=%d %s %s%s%s%s mode=0%o len=%s%s%s flags=%x\n",
2988                         who, i + flist->ndx_start,
2989                         root, dir, slash, name, trail,
2990                         (int)file->mode, comma_num(F_LENGTH(file)),
2991                         uidbuf, gidbuf, file->flags);
2992         }
2993 }
2994
2995 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2996 enum fnc_type { t_PATH, t_ITEM };
2997
2998 static int found_prefix;
2999
3000 /* Compare the names of two file_struct entities, similar to how strcmp()
3001  * would do if it were operating on the joined strings.
3002  *
3003  * Some differences beginning with protocol_version 29: (1) directory names
3004  * are compared with an assumed trailing slash so that they compare in a
3005  * way that would cause them to sort immediately prior to any content they
3006  * may have; (2) a directory of any name compares after a non-directory of
3007  * any name at the same depth; (3) a directory with name "." compares prior
3008  * to anything else.  These changes mean that a directory and a non-dir
3009  * with the same name will not compare as equal (protocol_version >= 29).
3010  *
3011  * The dirname component can be an empty string, but the basename component
3012  * cannot (and never is in the current codebase).  The basename component
3013  * may be NULL (for a removed item), in which case it is considered to be
3014  * after any existing item. */
3015 int f_name_cmp(const struct file_struct *f1, const struct file_struct *f2)
3016 {
3017         int dif;
3018         const uchar *c1, *c2;
3019         enum fnc_state state1, state2;
3020         enum fnc_type type1, type2;
3021         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
3022
3023         if (!f1 || !F_IS_ACTIVE(f1)) {
3024                 if (!f2 || !F_IS_ACTIVE(f2))
3025                         return 0;
3026                 return -1;
3027         }
3028         if (!f2 || !F_IS_ACTIVE(f2))
3029                 return 1;
3030
3031         c1 = (uchar*)f1->dirname;
3032         c2 = (uchar*)f2->dirname;
3033         if (c1 == c2)
3034                 c1 = c2 = NULL;
3035         if (!c1) {
3036                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
3037                 c1 = (const uchar*)f1->basename;
3038                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
3039                         type1 = t_ITEM;
3040                         state1 = s_TRAILING;
3041                         c1 = (uchar*)"";
3042                 } else
3043                         state1 = s_BASE;
3044         } else {
3045                 type1 = t_path;
3046                 state1 = s_DIR;
3047         }
3048         if (!c2) {
3049                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
3050                 c2 = (const uchar*)f2->basename;
3051                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
3052                         type2 = t_ITEM;
3053                         state2 = s_TRAILING;
3054                         c2 = (uchar*)"";
3055                 } else
3056                         state2 = s_BASE;
3057         } else {
3058                 type2 = t_path;
3059                 state2 = s_DIR;
3060         }
3061
3062         if (type1 != type2)
3063                 return type1 == t_PATH ? 1 : -1;
3064
3065         do {
3066                 if (!*c1) {
3067                         switch (state1) {
3068                         case s_DIR:
3069                                 state1 = s_SLASH;
3070                                 c1 = (uchar*)"/";
3071                                 break;
3072                         case s_SLASH:
3073                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
3074                                 c1 = (const uchar*)f1->basename;
3075                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
3076                                         type1 = t_ITEM;
3077                                         state1 = s_TRAILING;
3078                                         c1 = (uchar*)"";
3079                                 } else
3080                                         state1 = s_BASE;
3081                                 break;
3082                         case s_BASE:
3083                                 state1 = s_TRAILING;
3084                                 if (type1 == t_PATH) {
3085                                         c1 = (uchar*)"/";
3086                                         break;
3087                                 }
3088                                 /* FALL THROUGH */
3089                         case s_TRAILING:
3090                                 type1 = t_ITEM;
3091                                 break;
3092                         }
3093                         if (*c2 && type1 != type2)
3094                                 return type1 == t_PATH ? 1 : -1;
3095                 }
3096                 if (!*c2) {
3097                         switch (state2) {
3098                         case s_DIR:
3099                                 state2 = s_SLASH;
3100                                 c2 = (uchar*)"/";
3101                                 break;
3102                         case s_SLASH:
3103                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
3104                                 c2 = (const uchar*)f2->basename;
3105                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
3106                                         type2 = t_ITEM;
3107                                         state2 = s_TRAILING;
3108                                         c2 = (uchar*)"";
3109                                 } else
3110                                         state2 = s_BASE;
3111                                 break;
3112                         case s_BASE:
3113                                 state2 = s_TRAILING;
3114                                 if (type2 == t_PATH) {
3115                                         c2 = (uchar*)"/";
3116                                         break;
3117                                 }
3118                                 /* FALL THROUGH */
3119                         case s_TRAILING:
3120                                 found_prefix = 1;
3121                                 if (!*c1)
3122                                         return 0;
3123                                 type2 = t_ITEM;
3124                                 break;
3125                         }
3126                         if (type1 != type2)
3127                                 return type1 == t_PATH ? 1 : -1;
3128                 }
3129         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
3130
3131         return dif;
3132 }
3133
3134 /* Returns 1 if f1's filename has all of f2's filename as a prefix.  This does
3135  * not match if f2's basename is not an exact match of a path element in f1.
3136  * E.g. /path/foo is not a prefix of /path/foobar/baz, but /path/foobar is. */
3137 int f_name_has_prefix(const struct file_struct *f1, const struct file_struct *f2)
3138 {
3139         found_prefix = 0;
3140         f_name_cmp(f1, f2);
3141         return found_prefix;
3142 }
3143
3144 char *f_name_buf(void)
3145 {
3146         static char names[5][MAXPATHLEN];
3147         static unsigned int n;
3148
3149         n = (n + 1) % (sizeof names / sizeof names[0]);
3150
3151         return names[n];
3152 }
3153
3154 /* Return a copy of the full filename of a flist entry, using the indicated
3155  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
3156  * done because we checked the size when creating the file_struct entry.
3157  */
3158 char *f_name(const struct file_struct *f, char *fbuf)
3159 {
3160         if (!f || !F_IS_ACTIVE(f))
3161                 return NULL;
3162
3163         if (!fbuf)
3164                 fbuf = f_name_buf();
3165
3166         if (f->dirname) {
3167                 int len = strlen(f->dirname);
3168                 memcpy(fbuf, f->dirname, len);
3169                 fbuf[len] = '/';
3170                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
3171         } else
3172                 strlcpy(fbuf, f->basename, MAXPATHLEN);
3173
3174         return fbuf;
3175 }
3176
3177 /* Do a non-recursive scan of the named directory, possibly ignoring all
3178  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
3179  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
3180  * buffer (the functions we call will append names onto the end, but the old
3181  * dir value will be restored on exit). */
3182 struct file_list *get_dirlist(char *dirname, int dlen, int flags)
3183 {
3184         struct file_list *dirlist;
3185         char dirbuf[MAXPATHLEN];
3186         int save_recurse = recurse;
3187         int save_xfer_dirs = xfer_dirs;
3188         int save_prune_empty_dirs = prune_empty_dirs;
3189         int senddir_fd = flags & GDL_IGNORE_FILTER_RULES ? -2 : -1;
3190
3191         if (dlen < 0) {
3192                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
3193                 if (dlen >= MAXPATHLEN)
3194                         return NULL;
3195                 dirname = dirbuf;
3196         }
3197
3198         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
3199
3200         recurse = 0;
3201         xfer_dirs = 1;
3202         send_directory(senddir_fd, dirlist, dirname, dlen, FLAG_CONTENT_DIR);
3203         xfer_dirs = save_xfer_dirs;
3204         recurse = save_recurse;
3205         if (INFO_GTE(PROGRESS, 1))
3206                 flist_count_offset += dirlist->used;
3207
3208         prune_empty_dirs = 0;
3209         dirlist->sorted = dirlist->files;
3210         flist_sort_and_clean(dirlist, 0);
3211         prune_empty_dirs = save_prune_empty_dirs;
3212
3213         if (DEBUG_GTE(FLIST, 3))
3214                 output_flist(dirlist);
3215
3216         return dirlist;
3217 }