flist.c

   1 /*
   2  * Generate and receive file lists.
   3  *
   4  * Copyright (C) 1996 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2002-2008 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, visit the http://fsf.org website.
  21  */
  22
  23 #include "rsync.h"
  24 #include "ifuncs.h"
  25 #include "rounding.h"
  26 #include "io.h"
  27
  28 extern int verbose;
  29 extern int am_root;
  30 extern int am_server;
  31 extern int am_daemon;
  32 extern int am_sender;
  33 extern int am_generator;
  34 extern int inc_recurse;
  35 extern int do_progress;
  36 extern int always_checksum;
  37 extern int module_id;
  38 extern int ignore_errors;
  39 extern int numeric_ids;
  40 extern int recurse;
  41 extern int use_qsort;
  42 extern int xfer_dirs;
  43 extern int filesfrom_fd;
  44 extern int one_file_system;
  45 extern int copy_dirlinks;
  46 extern int keep_dirlinks;
  47 extern int preserve_uid;
  48 extern int preserve_gid;
  49 extern int preserve_acls;
  50 extern int preserve_xattrs;
  51 extern int preserve_links;
  52 extern int preserve_hard_links;
  53 extern int preserve_devices;
  54 extern int preserve_specials;
  55 extern int uid_ndx;
  56 extern int gid_ndx;
  57 extern int eol_nulls;
  58 extern int relative_paths;
  59 extern int implied_dirs;
  60 extern int file_extra_cnt;
  61 extern int ignore_perishable;
  62 extern int non_perishable_cnt;
  63 extern int prune_empty_dirs;
  64 extern int copy_links;
  65 extern int copy_unsafe_links;
  66 extern int protocol_version;
  67 extern int sanitize_paths;
  68 extern int munge_symlinks;
  69 extern int need_unsorted_flist;
  70 extern int unsort_ndx;
  71 extern struct stats stats;
  72 extern char *filesfrom_host;
  73
  74 extern char curr_dir[MAXPATHLEN];
  75
  76 extern struct chmod_mode_struct *chmod_modes;
  77
  78 extern struct filter_list_struct filter_list;
  79 extern struct filter_list_struct daemon_filter_list;
  80
  81 #ifdef ICONV_OPTION
  82 extern int filesfrom_convert;
  83 extern iconv_t ic_send, ic_recv;
  84 #endif
  85
  86 #define PTR_SIZE (sizeof (struct file_struct *))
  87
  88 int io_error;
  89 int checksum_len;
  90 dev_t filesystem_dev; /* used to implement -x */
  91
  92 struct file_list *cur_flist, *first_flist, *dir_flist;
  93 int send_dir_ndx = -1, send_dir_depth = -1;
  94 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
  95 int file_total = 0; /* total of all active items over all file-lists */
  96 int flist_eof = 0; /* all the file-lists are now known */
  97
  98 #define NORMAL_NAME 0
  99 #define SLASH_ENDING_NAME 1
 100 #define DOTDIR_NAME 2
 101
 102 /* Starting from protocol version 26, we always use 64-bit ino_t and dev_t
 103  * internally, even if this platform does not allow files to have 64-bit inums.
 104  * The only exception is if we're on a platform with no 64-bit type at all.
 105  *
 106  * Because we use read_longint() to get these off the wire, if you transfer
 107  * devices or (for protocols < 30) hardlinks with dev or inum > 2**32 to a
 108  * machine with no 64-bit types then you will get an overflow error.
 109  *
 110  * Note that if you transfer devices from a 64-bit-devt machine (say, Solaris)
 111  * to a 32-bit-devt machine (say, Linux-2.2/x86) then the device numbers will
 112  * be truncated.  But it's a kind of silly thing to do anyhow. */
 113
 114 /* The tmp_* vars are used as a cache area by make_file() to store data
 115  * that the sender doesn't need to remember in its file list.  The data
 116  * will survive just long enough to be used by send_file_entry(). */
 117 static dev_t tmp_rdev;
 118 #ifdef SUPPORT_HARD_LINKS
 119 static int64 tmp_dev, tmp_ino;
 120 #endif
 121 static char tmp_sum[MAX_DIGEST_LEN];
 122
 123 static char empty_sum[MAX_DIGEST_LEN];
 124 static int flist_count_offset; /* for --delete --progress */
 125 static int dir_count = 0;
 126
 127 static void flist_sort_and_clean(struct file_list *flist, int strip_root);
 128 static void output_flist(struct file_list *flist);
 129
 130 void init_flist(void)
 131 {
 132         if (verbose > 4) {
 133                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
 134                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
 135         }
 136         checksum_len = protocol_version < 21 ? 2
 137                      : protocol_version < 30 ? MD4_DIGEST_LEN
 138                      : MD5_DIGEST_LEN;
 139 }
 140
 141 static int show_filelist_p(void)
 142 {
 143         return verbose && xfer_dirs && !am_server && !inc_recurse;
 144 }
 145
 146 static void start_filelist_progress(char *kind)
 147 {
 148         rprintf(FCLIENT, "%s ... ", kind);
 149         if (verbose > 1 || do_progress)
 150                 rprintf(FCLIENT, "\n");
 151         rflush(FINFO);
 152 }
 153
 154 static void emit_filelist_progress(int count)
 155 {
 156         rprintf(FCLIENT, " %d files...\r", count);
 157 }
 158
 159 static void maybe_emit_filelist_progress(int count)
 160 {
 161         if (do_progress && show_filelist_p() && (count % 100) == 0)
 162                 emit_filelist_progress(count);
 163 }
 164
 165 static void finish_filelist_progress(const struct file_list *flist)
 166 {
 167         if (do_progress) {
 168                 /* This overwrites the progress line */
 169                 rprintf(FINFO, "%d file%sto consider\n",
 170                         flist->used, flist->used == 1 ? " " : "s ");
 171         } else
 172                 rprintf(FINFO, "done\n");
 173 }
 174
 175 void show_flist_stats(void)
 176 {
 177         /* Nothing yet */
 178 }
 179
 180 /* Stat either a symlink or its referent, depending on the settings of
 181  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 182  *
 183  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 184  * MAXPATHLEN chars) will be set to the symlink's target string.
 185  *
 186  * The stat structure pointed to by stp will contain information about the
 187  * link or the referent as appropriate, if they exist. */
 188 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 189 {
 190 #ifdef SUPPORT_LINKS
 191         if (link_stat(path, stp, copy_dirlinks) < 0)
 192                 return -1;
 193         if (S_ISLNK(stp->st_mode)) {
 194                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
 195                 if (llen < 0)
 196                         return -1;
 197                 linkbuf[llen] = '\0';
 198                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 199                         if (verbose > 1) {
 200                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 201                                         path, linkbuf);
 202                         }
 203                         return x_stat(path, stp, NULL);
 204                 }
 205                 if (munge_symlinks && am_sender && llen > SYMLINK_PREFIX_LEN
 206                  && strncmp(linkbuf, SYMLINK_PREFIX, SYMLINK_PREFIX_LEN) == 0) {
 207                         memmove(linkbuf, linkbuf + SYMLINK_PREFIX_LEN,
 208                                 llen - SYMLINK_PREFIX_LEN + 1);
 209                 }
 210         }
 211         return 0;
 212 #else
 213         return x_stat(path, stp, NULL);
 214 #endif
 215 }
 216
 217 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 218 {
 219 #ifdef SUPPORT_LINKS
 220         if (copy_links)
 221                 return x_stat(path, stp, NULL);
 222         if (x_lstat(path, stp, NULL) < 0)
 223                 return -1;
 224         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 225                 STRUCT_STAT st;
 226                 if (x_stat(path, &st, NULL) == 0 && S_ISDIR(st.st_mode))
 227                         *stp = st;
 228         }
 229         return 0;
 230 #else
 231         return x_stat(path, stp, NULL);
 232 #endif
 233 }
 234
 235 static inline int is_daemon_excluded(const char *fname, int is_dir)
 236 {
 237         if (daemon_filter_list.head
 238          && check_filter(&daemon_filter_list, FLOG, fname, is_dir) < 0) {
 239                 errno = ENOENT;
 240                 return 1;
 241         }
 242         return 0;
 243 }
 244
 245 static inline int path_is_daemon_excluded(char *path, int ignore_filename)
 246 {
 247         if (daemon_filter_list.head) {
 248                 char *slash = path;
 249
 250                 while ((slash = strchr(slash+1, '/')) != NULL) {
 251                         int ret;
 252                         *slash = '\0';
 253                         ret = check_filter(&daemon_filter_list, FLOG, path, 1);
 254                         *slash = '/';
 255                         if (ret < 0) {
 256                                 errno = ENOENT;
 257                                 return 1;
 258                         }
 259                 }
 260
 261                 if (!ignore_filename
 262                  && check_filter(&daemon_filter_list, FLOG, path, 1) < 0) {
 263                         errno = ENOENT;
 264                         return 1;
 265                 }
 266         }
 267
 268         return 0;
 269 }
 270
 271 /* This function is used to check if a file should be included/excluded
 272  * from the list of files based on its name and type etc.  The value of
 273  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 274 static int is_excluded(const char *fname, int is_dir, int filter_level)
 275 {
 276 #if 0 /* This currently never happens, so avoid a useless compare. */
 277         if (filter_level == NO_FILTERS)
 278                 return 0;
 279 #endif
 280         if (is_daemon_excluded(fname, is_dir))
 281                 return 1;
 282         if (filter_level != ALL_FILTERS)
 283                 return 0;
 284         if (filter_list.head
 285             && check_filter(&filter_list, FINFO, fname, is_dir) < 0)
 286                 return 1;
 287         return 0;
 288 }
 289
 290 static void send_directory(int f, struct file_list *flist,
 291                            char *fbuf, int len, int flags);
 292
 293 static const char *pathname, *orig_dir;
 294 static int pathname_len;
 295
 296 /* Make sure flist can hold at least flist->used + extra entries. */
 297 static void flist_expand(struct file_list *flist, int extra)
 298 {
 299         struct file_struct **new_ptr;
 300
 301         if (flist->used + extra <= flist->malloced)
 302                 return;
 303
 304         if (flist->malloced < FLIST_START)
 305                 flist->malloced = FLIST_START;
 306         else if (flist->malloced >= FLIST_LINEAR)
 307                 flist->malloced += FLIST_LINEAR;
 308         else
 309                 flist->malloced *= 2;
 310
 311         /* In case count jumped or we are starting the list
 312          * with a known size just set it. */
 313         if (flist->malloced < flist->used + extra)
 314                 flist->malloced = flist->used + extra;
 315
 316         new_ptr = realloc_array(flist->files, struct file_struct *,
 317                                 flist->malloced);
 318
 319         if (verbose >= 2 && flist->malloced != FLIST_START) {
 320                 rprintf(FCLIENT, "[%s] expand file_list pointer array to %.0f bytes, did%s move\n",
 321                     who_am_i(),
 322                     (double)sizeof flist->files[0] * flist->malloced,
 323                     (new_ptr == flist->files) ? " not" : "");
 324         }
 325
 326         flist->files = new_ptr;
 327
 328         if (!flist->files)
 329                 out_of_memory("flist_expand");
 330 }
 331
 332 static void flist_done_allocating(struct file_list *flist)
 333 {
 334         void *ptr = pool_boundary(flist->file_pool, 8*1024);
 335         if (flist->pool_boundary == ptr)
 336                 flist->pool_boundary = NULL; /* list didn't use any pool memory */
 337         else
 338                 flist->pool_boundary = ptr;
 339 }
 340
 341 /* Call this with EITHER (1) "file, NULL, 0" to chdir() to the file's
 342  * F_PATHNAME(), or (2) "NULL, dir, dirlen" to chdir() to the supplied dir,
 343  * with dir == NULL taken to be the starting directory, and dirlen < 0
 344  * indicating that strdup(dir) should be called and then the -dirlen length
 345  * value checked to ensure that it is not daemon-excluded. */
 346 int change_pathname(struct file_struct *file, const char *dir, int dirlen)
 347 {
 348         if (dirlen < 0) {
 349                 char *cpy = strdup(dir);
 350                 if (*cpy != '/')
 351                         change_dir(orig_dir, CD_SKIP_CHDIR);
 352                 if (path_is_daemon_excluded(cpy, 0))
 353                         goto chdir_error;
 354                 dir = cpy;
 355                 dirlen = -dirlen;
 356         } else {
 357                 if (file) {
 358                         if (pathname == F_PATHNAME(file))
 359                                 return 1;
 360                         dir = F_PATHNAME(file);
 361                         if (dir)
 362                                 dirlen = strlen(dir);
 363                 } else if (pathname == dir)
 364                         return 1;
 365                 if (dir && *dir != '/')
 366                         change_dir(orig_dir, CD_SKIP_CHDIR);
 367         }
 368
 369         pathname = dir;
 370         pathname_len = dirlen;
 371
 372         if (!dir)
 373                 dir = orig_dir;
 374
 375         if (!change_dir(dir, CD_NORMAL)) {
 376           chdir_error:
 377                 io_error |= IOERR_GENERAL;
 378                 rsyserr(FERROR, errno, "change_dir %s failed", full_fname(dir));
 379                 if (dir != orig_dir)
 380                         change_dir(orig_dir, CD_NORMAL);
 381                 pathname = NULL;
 382                 pathname_len = 0;
 383                 return 0;
 384         }
 385
 386         return 1;
 387 }
 388
 389 static void send_file_entry(int f, const char *fname, struct file_struct *file, int ndx, int first_ndx)
 390 {
 391         static time_t modtime;
 392         static mode_t mode;
 393 #ifdef SUPPORT_HARD_LINKS
 394         static int64 dev;
 395 #endif
 396         static dev_t rdev;
 397         static uint32 rdev_major;
 398         static uid_t uid;
 399         static gid_t gid;
 400         static const char *user_name, *group_name;
 401         static char lastname[MAXPATHLEN];
 402         int first_hlink_ndx = -1;
 403         int l1, l2;
 404         int xflags;
 405
 406         /* Initialize starting value of xflags. */
 407         if (protocol_version >= 30 && S_ISDIR(file->mode)) {
 408                 dir_count++;
 409                 if (file->flags & FLAG_CONTENT_DIR)
 410                         xflags = file->flags & FLAG_TOP_DIR;
 411                 else if (file->flags & FLAG_IMPLIED_DIR)
 412                         xflags = XMIT_TOP_DIR | XMIT_NO_CONTENT_DIR;
 413                 else
 414                         xflags = XMIT_NO_CONTENT_DIR;
 415         } else
 416                 xflags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 417
 418         if (file->mode == mode)
 419                 xflags |= XMIT_SAME_MODE;
 420         else
 421                 mode = file->mode;
 422
 423         if ((preserve_devices && IS_DEVICE(mode))
 424          || (preserve_specials && IS_SPECIAL(mode))) {
 425                 if (protocol_version < 28) {
 426                         if (tmp_rdev == rdev)
 427                                 xflags |= XMIT_SAME_RDEV_pre28;
 428                         else
 429                                 rdev = tmp_rdev;
 430                 } else {
 431                         rdev = tmp_rdev;
 432                         if ((uint32)major(rdev) == rdev_major)
 433                                 xflags |= XMIT_SAME_RDEV_MAJOR;
 434                         else
 435                                 rdev_major = major(rdev);
 436                         if (protocol_version < 30 && (uint32)minor(rdev) <= 0xFFu)
 437                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
 438                 }
 439         } else if (protocol_version < 28)
 440                 rdev = MAKEDEV(0, 0);
 441         if (!preserve_uid || ((uid_t)F_OWNER(file) == uid && *lastname))
 442                 xflags |= XMIT_SAME_UID;
 443         else {
 444                 uid = F_OWNER(file);
 445                 if (!numeric_ids) {
 446                         user_name = add_uid(uid);
 447                         if (inc_recurse && user_name)
 448                                 xflags |= XMIT_USER_NAME_FOLLOWS;
 449                 }
 450         }
 451         if (!preserve_gid || ((gid_t)F_GROUP(file) == gid && *lastname))
 452                 xflags |= XMIT_SAME_GID;
 453         else {
 454                 gid = F_GROUP(file);
 455                 if (!numeric_ids) {
 456                         group_name = add_gid(gid);
 457                         if (inc_recurse && group_name)
 458                                 xflags |= XMIT_GROUP_NAME_FOLLOWS;
 459                 }
 460         }
 461         if (file->modtime == modtime)
 462                 xflags |= XMIT_SAME_TIME;
 463         else
 464                 modtime = file->modtime;
 465
 466 #ifdef SUPPORT_HARD_LINKS
 467         if (tmp_dev != 0) {
 468                 if (protocol_version >= 30) {
 469                         struct ht_int64_node *np = idev_find(tmp_dev, tmp_ino);
 470                         first_hlink_ndx = (int32)(long)np->data - 1;
 471                         if (first_hlink_ndx < 0) {
 472                                 np->data = (void*)(long)(first_ndx + ndx + 1);
 473                                 xflags |= XMIT_HLINK_FIRST;
 474                         }
 475                 } else {
 476                         if (tmp_dev == dev) {
 477                                 if (protocol_version >= 28)
 478                                         xflags |= XMIT_SAME_DEV_pre30;
 479                         } else
 480                                 dev = tmp_dev;
 481                 }
 482                 xflags |= XMIT_HLINKED;
 483         }
 484 #endif
 485
 486         for (l1 = 0;
 487             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 488             l1++) {}
 489         l2 = strlen(fname+l1);
 490
 491         if (l1 > 0)
 492                 xflags |= XMIT_SAME_NAME;
 493         if (l2 > 255)
 494                 xflags |= XMIT_LONG_NAME;
 495
 496         /* We must make sure we don't send a zero flag byte or the
 497          * other end will terminate the flist transfer.  Note that
 498          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 499          * it's harmless way to add a bit to the first flag byte. */
 500         if (protocol_version >= 28) {
 501                 if (!xflags && !S_ISDIR(mode))
 502                         xflags |= XMIT_TOP_DIR;
 503                 if ((xflags & 0xFF00) || !xflags) {
 504                         xflags |= XMIT_EXTENDED_FLAGS;
 505                         write_shortint(f, xflags);
 506                 } else
 507                         write_byte(f, xflags);
 508         } else {
 509                 if (!(xflags & 0xFF))
 510                         xflags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 511                 write_byte(f, xflags);
 512         }
 513         if (xflags & XMIT_SAME_NAME)
 514                 write_byte(f, l1);
 515         if (xflags & XMIT_LONG_NAME)
 516                 write_varint30(f, l2);
 517         else
 518                 write_byte(f, l2);
 519         write_buf(f, fname + l1, l2);
 520
 521         if (first_hlink_ndx >= 0) {
 522                 write_varint(f, first_hlink_ndx);
 523                 if (first_hlink_ndx >= first_ndx)
 524                         goto the_end;
 525         }
 526
 527         write_varlong30(f, F_LENGTH(file), 3);
 528         if (!(xflags & XMIT_SAME_TIME)) {
 529                 if (protocol_version >= 30)
 530                         write_varlong(f, modtime, 4);
 531                 else
 532                         write_int(f, modtime);
 533         }
 534         if (!(xflags & XMIT_SAME_MODE))
 535                 write_int(f, to_wire_mode(mode));
 536         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
 537                 if (protocol_version < 30)
 538                         write_int(f, uid);
 539                 else {
 540                         write_varint(f, uid);
 541                         if (xflags & XMIT_USER_NAME_FOLLOWS) {
 542                                 int len = strlen(user_name);
 543                                 write_byte(f, len);
 544                                 write_buf(f, user_name, len);
 545                         }
 546                 }
 547         }
 548         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
 549                 if (protocol_version < 30)
 550                         write_int(f, gid);
 551                 else {
 552                         write_varint(f, gid);
 553                         if (xflags & XMIT_GROUP_NAME_FOLLOWS) {
 554                                 int len = strlen(group_name);
 555                                 write_byte(f, len);
 556                                 write_buf(f, group_name, len);
 557                         }
 558                 }
 559         }
 560         if ((preserve_devices && IS_DEVICE(mode))
 561          || (preserve_specials && IS_SPECIAL(mode))) {
 562                 if (protocol_version < 28) {
 563                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 564                                 write_int(f, (int)rdev);
 565                 } else {
 566                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 567                                 write_varint30(f, major(rdev));
 568                         if (protocol_version >= 30)
 569                                 write_varint(f, minor(rdev));
 570                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 571                                 write_byte(f, minor(rdev));
 572                         else
 573                                 write_int(f, minor(rdev));
 574                 }
 575         }
 576
 577 #ifdef SUPPORT_LINKS
 578         if (preserve_links && S_ISLNK(mode)) {
 579                 const char *sl = F_SYMLINK(file);
 580                 int len = strlen(sl);
 581                 write_varint30(f, len);
 582                 write_buf(f, sl, len);
 583         }
 584 #endif
 585
 586 #ifdef SUPPORT_HARD_LINKS
 587         if (tmp_dev != 0 && protocol_version < 30) {
 588                 if (protocol_version < 26) {
 589                         /* 32-bit dev_t and ino_t */
 590                         write_int(f, (int32)dev);
 591                         write_int(f, (int32)tmp_ino);
 592                 } else {
 593                         /* 64-bit dev_t and ino_t */
 594                         if (!(xflags & XMIT_SAME_DEV_pre30))
 595                                 write_longint(f, dev);
 596                         write_longint(f, tmp_ino);
 597                 }
 598         }
 599 #endif
 600
 601         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 602                 const char *sum;
 603                 if (S_ISREG(mode))
 604                         sum = tmp_sum;
 605                 else {
 606                         /* Prior to 28, we sent a useless set of nulls. */
 607                         sum = empty_sum;
 608                 }
 609                 write_buf(f, sum, checksum_len);
 610         }
 611
 612   the_end:
 613         strlcpy(lastname, fname, MAXPATHLEN);
 614
 615         if (S_ISREG(mode) || S_ISLNK(mode))
 616                 stats.total_size += F_LENGTH(file);
 617 }
 618
 619 static struct file_struct *recv_file_entry(struct file_list *flist,
 620                                            int xflags, int f)
 621 {
 622         static int64 modtime;
 623         static mode_t mode;
 624 #ifdef SUPPORT_HARD_LINKS
 625         static int64 dev;
 626 #endif
 627         static dev_t rdev;
 628         static uint32 rdev_major;
 629         static uid_t uid;
 630         static gid_t gid;
 631         static uint16 gid_flags;
 632         static char lastname[MAXPATHLEN], *lastdir;
 633         static int lastdir_depth, lastdir_len = -1;
 634         static unsigned int del_hier_name_len = 0;
 635         static int in_del_hier = 0;
 636         char thisname[MAXPATHLEN];
 637         unsigned int l1 = 0, l2 = 0;
 638         int alloc_len, basename_len, linkname_len;
 639         int extra_len = file_extra_cnt * EXTRA_LEN;
 640         int first_hlink_ndx = -1;
 641         OFF_T file_length;
 642         const char *basename;
 643         struct file_struct *file;
 644         alloc_pool_t *pool;
 645         char *bp;
 646
 647         if (xflags & XMIT_SAME_NAME)
 648                 l1 = read_byte(f);
 649
 650         if (xflags & XMIT_LONG_NAME)
 651                 l2 = read_varint30(f);
 652         else
 653                 l2 = read_byte(f);
 654
 655         if (l2 >= MAXPATHLEN - l1) {
 656                 rprintf(FERROR,
 657                         "overflow: xflags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 658                         xflags, l1, l2, lastname, who_am_i());
 659                 overflow_exit("recv_file_entry");
 660         }
 661
 662         strlcpy(thisname, lastname, l1 + 1);
 663         read_sbuf(f, &thisname[l1], l2);
 664         thisname[l1 + l2] = 0;
 665
 666         /* Abuse basename_len for a moment... */
 667         basename_len = strlcpy(lastname, thisname, MAXPATHLEN);
 668
 669 #ifdef ICONV_OPTION
 670         if (ic_recv != (iconv_t)-1) {
 671                 xbuf outbuf, inbuf;
 672
 673                 INIT_CONST_XBUF(outbuf, thisname);
 674                 INIT_XBUF(inbuf, lastname, basename_len, -1);
 675
 676                 if (iconvbufs(ic_recv, &inbuf, &outbuf, 0) < 0) {
 677                         io_error |= IOERR_GENERAL;
 678                         rprintf(FINFO,
 679                             "[%s] cannot convert filename: %s (%s)\n",
 680                             who_am_i(), lastname, strerror(errno));
 681                         outbuf.len = 0;
 682                 }
 683                 outbuf.buf[outbuf.len] = '\0';
 684         }
 685 #endif
 686
 687         if (*thisname)
 688                 clean_fname(thisname, 0);
 689
 690         if (sanitize_paths)
 691                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
 692
 693         if ((basename = strrchr(thisname, '/')) != NULL) {
 694                 int len = basename++ - thisname;
 695                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 696                         lastdir = new_array(char, len + 1);
 697                         memcpy(lastdir, thisname, len);
 698                         lastdir[len] = '\0';
 699                         lastdir_len = len;
 700                         lastdir_depth = count_dir_elements(lastdir);
 701                 }
 702         } else
 703                 basename = thisname;
 704         basename_len = strlen(basename) + 1; /* count the '\0' */
 705
 706 #ifdef SUPPORT_HARD_LINKS
 707         if (protocol_version >= 30
 708          && BITS_SETnUNSET(xflags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 709                 first_hlink_ndx = read_varint(f);
 710                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->ndx_start + flist->used) {
 711                         rprintf(FERROR,
 712                                 "hard-link reference out of range: %d (%d)\n",
 713                                 first_hlink_ndx, flist->ndx_start + flist->used);
 714                         exit_cleanup(RERR_PROTOCOL);
 715                 }
 716                 if (first_hlink_ndx >= flist->ndx_start) {
 717                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
 718                         file_length = F_LENGTH(first);
 719                         modtime = first->modtime;
 720                         mode = first->mode;
 721                         if (preserve_uid)
 722                                 uid = F_OWNER(first);
 723                         if (preserve_gid)
 724                                 gid = F_GROUP(first);
 725                         if ((preserve_devices && IS_DEVICE(mode))
 726                          || (preserve_specials && IS_SPECIAL(mode))) {
 727                                 uint32 *devp = F_RDEV_P(first);
 728                                 rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 729                                 extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 730                         }
 731                         if (preserve_links && S_ISLNK(mode))
 732                                 linkname_len = strlen(F_SYMLINK(first)) + 1;
 733                         else
 734                                 linkname_len = 0;
 735                         goto create_object;
 736                 }
 737         }
 738 #endif
 739
 740         file_length = read_varlong30(f, 3);
 741         if (!(xflags & XMIT_SAME_TIME)) {
 742                 if (protocol_version >= 30) {
 743                         modtime = read_varlong(f, 4);
 744 #if SIZEOF_TIME_T < SIZEOF_INT64
 745                         if (!am_generator && (int64)(time_t)modtime != modtime) {
 746                                 rprintf(FERROR_XFER,
 747                                     "Time value of %s truncated on receiver.\n",
 748                                     lastname);
 749                         }
 750 #endif
 751                 } else
 752                         modtime = read_int(f);
 753         }
 754         if (!(xflags & XMIT_SAME_MODE))
 755                 mode = from_wire_mode(read_int(f));
 756
 757         if (chmod_modes && !S_ISLNK(mode))
 758                 mode = tweak_mode(mode, chmod_modes);
 759
 760         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
 761                 if (protocol_version < 30)
 762                         uid = (uid_t)read_int(f);
 763                 else {
 764                         uid = (uid_t)read_varint(f);
 765                         if (xflags & XMIT_USER_NAME_FOLLOWS)
 766                                 uid = recv_user_name(f, uid);
 767                         else if (inc_recurse && am_root && !numeric_ids)
 768                                 uid = match_uid(uid);
 769                 }
 770         }
 771         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
 772                 if (protocol_version < 30)
 773                         gid = (gid_t)read_int(f);
 774                 else {
 775                         gid = (gid_t)read_varint(f);
 776                         gid_flags = 0;
 777                         if (xflags & XMIT_GROUP_NAME_FOLLOWS)
 778                                 gid = recv_group_name(f, gid, &gid_flags);
 779                         else if (inc_recurse && (!am_root || !numeric_ids))
 780                                 gid = match_gid(gid, &gid_flags);
 781                 }
 782         }
 783
 784         if ((preserve_devices && IS_DEVICE(mode))
 785          || (preserve_specials && IS_SPECIAL(mode))) {
 786                 if (protocol_version < 28) {
 787                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 788                                 rdev = (dev_t)read_int(f);
 789                 } else {
 790                         uint32 rdev_minor;
 791                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 792                                 rdev_major = read_varint30(f);
 793                         if (protocol_version >= 30)
 794                                 rdev_minor = read_varint(f);
 795                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 796                                 rdev_minor = read_byte(f);
 797                         else
 798                                 rdev_minor = read_int(f);
 799                         rdev = MAKEDEV(rdev_major, rdev_minor);
 800                 }
 801                 extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 802                 file_length = 0;
 803         } else if (protocol_version < 28)
 804                 rdev = MAKEDEV(0, 0);
 805
 806 #ifdef SUPPORT_LINKS
 807         if (preserve_links && S_ISLNK(mode)) {
 808                 linkname_len = read_varint30(f) + 1; /* count the '\0' */
 809                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 810                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 811                                 linkname_len - 1);
 812                         overflow_exit("recv_file_entry");
 813                 }
 814                 if (munge_symlinks)
 815                         linkname_len += SYMLINK_PREFIX_LEN;
 816         }
 817         else
 818 #endif
 819                 linkname_len = 0;
 820
 821 #ifdef SUPPORT_HARD_LINKS
 822   create_object:
 823         if (preserve_hard_links) {
 824                 if (protocol_version < 28 && S_ISREG(mode))
 825                         xflags |= XMIT_HLINKED;
 826                 if (xflags & XMIT_HLINKED)
 827                         extra_len += (inc_recurse+1) * EXTRA_LEN;
 828         }
 829 #endif
 830
 831 #ifdef SUPPORT_ACLS
 832         /* Directories need an extra int32 for the default ACL. */
 833         if (preserve_acls && S_ISDIR(mode))
 834                 extra_len += EXTRA_LEN;
 835 #endif
 836
 837         if (always_checksum && S_ISREG(mode))
 838                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 839
 840         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 841                 extra_len += EXTRA_LEN;
 842
 843         if (inc_recurse && S_ISDIR(mode)) {
 844                 if (one_file_system) {
 845                         /* Room to save the dir's device for -x */
 846                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 847                 }
 848                 pool = dir_flist->file_pool;
 849         } else
 850                 pool = flist->file_pool;
 851
 852 #if EXTRA_ROUNDING > 0
 853         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 854                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 855 #endif
 856
 857         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 858                   + linkname_len;
 859         bp = pool_alloc(pool, alloc_len, "recv_file_entry");
 860
 861         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 862         bp += extra_len;
 863         file = (struct file_struct *)bp;
 864         bp += FILE_STRUCT_LEN;
 865
 866         memcpy(bp, basename, basename_len);
 867
 868 #ifdef SUPPORT_HARD_LINKS
 869         if (xflags & XMIT_HLINKED)
 870                 file->flags |= FLAG_HLINKED;
 871 #endif
 872         file->modtime = (time_t)modtime;
 873         file->len32 = (uint32)file_length;
 874         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 875                 file->flags |= FLAG_LENGTH64;
 876                 OPT_EXTRA(file, 0)->unum = (uint32)(file_length >> 32);
 877         }
 878         file->mode = mode;
 879         if (preserve_uid)
 880                 F_OWNER(file) = uid;
 881         if (preserve_gid) {
 882                 F_GROUP(file) = gid;
 883                 file->flags |= gid_flags;
 884         }
 885         if (unsort_ndx)
 886                 F_NDX(file) = flist->used + flist->ndx_start;
 887
 888         if (basename != thisname) {
 889                 file->dirname = lastdir;
 890                 F_DEPTH(file) = lastdir_depth + 1;
 891         } else
 892                 F_DEPTH(file) = 1;
 893
 894         if (S_ISDIR(mode)) {
 895                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 896                         F_DEPTH(file)--;
 897                 if (protocol_version >= 30) {
 898                         if (!(xflags & XMIT_NO_CONTENT_DIR)) {
 899                                 if (xflags & XMIT_TOP_DIR)
 900                                         file->flags |= FLAG_TOP_DIR;
 901                                 file->flags |= FLAG_CONTENT_DIR;
 902                         } else if (xflags & XMIT_TOP_DIR)
 903                                 file->flags |= FLAG_IMPLIED_DIR;
 904                 } else if (xflags & XMIT_TOP_DIR) {
 905                         in_del_hier = recurse;
 906                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
 907                         if (relative_paths && del_hier_name_len > 2
 908                             && lastname[del_hier_name_len-1] == '.'
 909                             && lastname[del_hier_name_len-2] == '/')
 910                                 del_hier_name_len -= 2;
 911                         file->flags |= FLAG_TOP_DIR | FLAG_CONTENT_DIR;
 912                 } else if (in_del_hier) {
 913                         if (!relative_paths || !del_hier_name_len
 914                          || (l1 >= del_hier_name_len
 915                           && lastname[del_hier_name_len] == '/'))
 916                                 file->flags |= FLAG_CONTENT_DIR;
 917                         else
 918                                 in_del_hier = 0;
 919                 }
 920         }
 921
 922         if ((preserve_devices && IS_DEVICE(mode))
 923          || (preserve_specials && IS_SPECIAL(mode))) {
 924                 uint32 *devp = F_RDEV_P(file);
 925                 DEV_MAJOR(devp) = major(rdev);
 926                 DEV_MINOR(devp) = minor(rdev);
 927         }
 928
 929 #ifdef SUPPORT_LINKS
 930         if (linkname_len) {
 931                 bp += basename_len;
 932                 if (first_hlink_ndx >= flist->ndx_start) {
 933                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
 934                         memcpy(bp, F_SYMLINK(first), linkname_len);
 935                 } else if (munge_symlinks) {
 936                         strlcpy(bp, SYMLINK_PREFIX, linkname_len);
 937                         bp += SYMLINK_PREFIX_LEN;
 938                         linkname_len -= SYMLINK_PREFIX_LEN;
 939                         read_sbuf(f, bp, linkname_len - 1);
 940                 } else {
 941                         read_sbuf(f, bp, linkname_len - 1);
 942                         if (sanitize_paths)
 943                                 sanitize_path(bp, bp, "", lastdir_depth, SP_DEFAULT);
 944                 }
 945         }
 946 #endif
 947
 948 #ifdef SUPPORT_HARD_LINKS
 949         if (preserve_hard_links && xflags & XMIT_HLINKED) {
 950                 if (protocol_version >= 30) {
 951                         if (xflags & XMIT_HLINK_FIRST) {
 952                                 F_HL_GNUM(file) = flist->ndx_start + flist->used;
 953                         } else
 954                                 F_HL_GNUM(file) = first_hlink_ndx;
 955                 } else {
 956                         static int32 cnt = 0;
 957                         struct ht_int64_node *np;
 958                         int64 ino;
 959                         int32 ndx;
 960                         if (protocol_version < 26) {
 961                                 dev = read_int(f);
 962                                 ino = read_int(f);
 963                         } else {
 964                                 if (!(xflags & XMIT_SAME_DEV_pre30))
 965                                         dev = read_longint(f);
 966                                 ino = read_longint(f);
 967                         }
 968                         np = idev_find(dev, ino);
 969                         ndx = (int32)(long)np->data - 1;
 970                         if (ndx < 0) {
 971                                 ndx = cnt++;
 972                                 np->data = (void*)(long)cnt;
 973                         }
 974                         F_HL_GNUM(file) = ndx;
 975                 }
 976         }
 977 #endif
 978
 979         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 980                 if (S_ISREG(mode))
 981                         bp = F_SUM(file);
 982                 else {
 983                         /* Prior to 28, we get a useless set of nulls. */
 984                         bp = tmp_sum;
 985                 }
 986                 if (first_hlink_ndx >= flist->ndx_start) {
 987                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
 988                         memcpy(bp, F_SUM(first), checksum_len);
 989                 } else
 990                         read_buf(f, bp, checksum_len);
 991         }
 992
 993 #ifdef SUPPORT_ACLS
 994         if (preserve_acls && !S_ISLNK(mode))
 995                 receive_acl(file, f);
 996 #endif
 997 #ifdef SUPPORT_XATTRS
 998         if (preserve_xattrs)
 999                 receive_xattr(file, f );
1000 #endif
1001
1002         if (S_ISREG(mode) || S_ISLNK(mode))
1003                 stats.total_size += file_length;
1004
1005         return file;
1006 }
1007
1008 /* Create a file_struct for a named file by reading its stat() information
1009  * and performing extensive checks against global options.
1010  *
1011  * Returns a pointer to the new file struct, or NULL if there was an error
1012  * or this file should be excluded. */
1013 struct file_struct *make_file(const char *fname, struct file_list *flist,
1014                               STRUCT_STAT *stp, int flags, int filter_level)
1015 {
1016         static char *lastdir;
1017         static int lastdir_len = -1;
1018         struct file_struct *file;
1019         char thisname[MAXPATHLEN];
1020         char linkname[MAXPATHLEN];
1021         int alloc_len, basename_len, linkname_len;
1022         int extra_len = file_extra_cnt * EXTRA_LEN;
1023         const char *basename;
1024         alloc_pool_t *pool;
1025         STRUCT_STAT st;
1026         int excl_ret;
1027         char *bp;
1028
1029         if (strlcpy(thisname, fname, sizeof thisname) >= sizeof thisname) {
1030                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
1031                 return NULL;
1032         }
1033         clean_fname(thisname, 0);
1034         if (sanitize_paths)
1035                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
1036
1037         if (stp && S_ISDIR(stp->st_mode)) {
1038                 st = *stp; /* Needed for "symlink/." with --relative. */
1039                 *linkname = '\0'; /* make IBM code checker happy */
1040         } else if (readlink_stat(thisname, &st, linkname) != 0) {
1041                 int save_errno = errno;
1042                 /* See if file is excluded before reporting an error. */
1043                 if (filter_level != NO_FILTERS
1044                  && (is_excluded(thisname, 0, filter_level)
1045                   || is_excluded(thisname, 1, filter_level))) {
1046                         if (ignore_perishable && save_errno != ENOENT)
1047                                 non_perishable_cnt++;
1048                         return NULL;
1049                 }
1050                 if (save_errno == ENOENT) {
1051 #ifdef SUPPORT_LINKS
1052                         /* When our options tell us to follow a symlink that
1053                          * points nowhere, tell the user about the symlink
1054                          * instead of giving a "vanished" message.  We only
1055                          * dereference a symlink if one of the --copy*links
1056                          * options was specified, so there's no need for the
1057                          * extra lstat() if one of these options isn't on. */
1058                         if ((copy_links || copy_unsafe_links || copy_dirlinks)
1059                          && x_lstat(thisname, &st, NULL) == 0
1060                          && S_ISLNK(st.st_mode)) {
1061                                 io_error |= IOERR_GENERAL;
1062                                 rprintf(FERROR_XFER, "symlink has no referent: %s\n",
1063                                         full_fname(thisname));
1064                         } else
1065 #endif
1066                         {
1067                                 enum logcode c = am_daemon && protocol_version < 28
1068                                                ? FERROR : FWARNING;
1069                                 io_error |= IOERR_VANISHED;
1070                                 rprintf(c, "file has vanished: %s\n",
1071                                         full_fname(thisname));
1072                         }
1073                 } else {
1074                         io_error |= IOERR_GENERAL;
1075                         rsyserr(FERROR_XFER, save_errno, "readlink %s failed",
1076                                 full_fname(thisname));
1077                 }
1078                 return NULL;
1079         }
1080
1081         /* backup.c calls us with filter_level set to NO_FILTERS. */
1082         if (filter_level == NO_FILTERS)
1083                 goto skip_filters;
1084
1085         if (S_ISDIR(st.st_mode)) {
1086                 if (!xfer_dirs) {
1087                         rprintf(FINFO, "skipping directory %s\n", thisname);
1088                         return NULL;
1089                 }
1090                 /* -x only affects dirs because we need to avoid recursing
1091                  * into a mount-point directory, not to avoid copying a
1092                  * symlinked file if -L (or similar) was specified. */
1093                 if (one_file_system && st.st_dev != filesystem_dev
1094                  && BITS_SETnUNSET(flags, FLAG_CONTENT_DIR, FLAG_TOP_DIR)) {
1095                         if (one_file_system > 1) {
1096                                 if (verbose > 1) {
1097                                         rprintf(FINFO,
1098                                             "[%s] skipping mount-point dir %s\n",
1099                                             who_am_i(), thisname);
1100                                 }
1101                                 return NULL;
1102                         }
1103                         flags |= FLAG_MOUNT_DIR;
1104                         flags &= ~FLAG_CONTENT_DIR;
1105                 }
1106         } else
1107                 flags &= ~FLAG_CONTENT_DIR;
1108
1109         if (S_ISDIR(st.st_mode)) {
1110                 if (flags & FLAG_DOTDIR_NAME) {
1111                         /* A "." fname (or "/." fname in relative mode) is
1112                          * never excluded.  No other trailing-dotdir names
1113                          * are possible. */
1114                         excl_ret = 0;
1115                 } else
1116                         excl_ret = is_excluded(thisname, 1, filter_level);
1117         } else
1118                 excl_ret = is_excluded(thisname, 0, filter_level);
1119         if (excl_ret) {
1120                 if (ignore_perishable)
1121                         non_perishable_cnt++;
1122                 return NULL;
1123         }
1124
1125         if (lp_ignore_nonreadable(module_id)) {
1126 #ifdef SUPPORT_LINKS
1127                 if (!S_ISLNK(st.st_mode))
1128 #endif
1129                         if (access(thisname, R_OK) != 0)
1130                                 return NULL;
1131         }
1132
1133   skip_filters:
1134
1135         /* Only divert a directory in the main transfer. */
1136         if (flist) {
1137                 if (flist->prev && S_ISDIR(st.st_mode)
1138                  && flags & FLAG_DIVERT_DIRS) {
1139                         /* Room for parent/sibling/next-child info. */
1140                         extra_len += DIRNODE_EXTRA_CNT * EXTRA_LEN;
1141                         if (relative_paths)
1142                                 extra_len += PTR_EXTRA_CNT * EXTRA_LEN;
1143                         pool = dir_flist->file_pool;
1144                 } else
1145                         pool = flist->file_pool;
1146         } else {
1147 #ifdef SUPPORT_ACLS
1148                 /* Directories need an extra int32 for the default ACL. */
1149                 if (preserve_acls && S_ISDIR(st.st_mode))
1150                         extra_len += EXTRA_LEN;
1151 #endif
1152                 pool = NULL;
1153         }
1154
1155         if (verbose > 2) {
1156                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1157                         who_am_i(), thisname, filter_level);
1158         }
1159
1160         if ((basename = strrchr(thisname, '/')) != NULL) {
1161                 int len = basename++ - thisname;
1162                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1163                         lastdir = new_array(char, len + 1);
1164                         memcpy(lastdir, thisname, len);
1165                         lastdir[len] = '\0';
1166                         lastdir_len = len;
1167                 }
1168         } else
1169                 basename = thisname;
1170         basename_len = strlen(basename) + 1; /* count the '\0' */
1171
1172 #ifdef SUPPORT_LINKS
1173         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1174 #else
1175         linkname_len = 0;
1176 #endif
1177
1178         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1179                 extra_len += EXTRA_LEN;
1180
1181 #if EXTRA_ROUNDING > 0
1182         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1183                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1184 #endif
1185
1186         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1187                   + linkname_len;
1188         if (pool)
1189                 bp = pool_alloc(pool, alloc_len, "make_file");
1190         else {
1191                 if (!(bp = new_array(char, alloc_len)))
1192                         out_of_memory("make_file");
1193         }
1194
1195         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1196         bp += extra_len;
1197         file = (struct file_struct *)bp;
1198         bp += FILE_STRUCT_LEN;
1199
1200         memcpy(bp, basename, basename_len);
1201
1202 #ifdef SUPPORT_HARD_LINKS
1203         if (preserve_hard_links && flist && flist->prev) {
1204                 if (protocol_version >= 28
1205                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1206                  : S_ISREG(st.st_mode)) {
1207                         tmp_dev = st.st_dev;
1208                         tmp_ino = st.st_ino;
1209                 } else
1210                         tmp_dev = 0;
1211         }
1212 #endif
1213
1214 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1215         if (IS_DEVICE(st.st_mode) || IS_SPECIAL(st.st_mode)) {
1216                 tmp_rdev = st.st_rdev;
1217                 st.st_size = 0;
1218         }
1219 #endif
1220
1221         file->flags = flags;
1222         file->modtime = st.st_mtime;
1223         file->len32 = (uint32)st.st_size;
1224         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1225                 file->flags |= FLAG_LENGTH64;
1226                 OPT_EXTRA(file, 0)->unum = (uint32)(st.st_size >> 32);
1227         }
1228         file->mode = st.st_mode;
1229         if (uid_ndx) /* Check uid_ndx instead of preserve_uid for del support */
1230                 F_OWNER(file) = st.st_uid;
1231         if (gid_ndx) /* Check gid_ndx instead of preserve_gid for del support */
1232                 F_GROUP(file) = st.st_gid;
1233
1234         if (basename != thisname)
1235                 file->dirname = lastdir;
1236
1237 #ifdef SUPPORT_LINKS
1238         if (linkname_len)
1239                 memcpy(bp + basename_len, linkname, linkname_len);
1240 #endif
1241
1242         if (always_checksum && am_sender && S_ISREG(st.st_mode))
1243                 file_checksum(thisname, tmp_sum, st.st_size);
1244
1245         if (am_sender)
1246                 F_PATHNAME(file) = pathname;
1247         else if (!pool)
1248                 F_DEPTH(file) = extra_len / EXTRA_LEN;
1249
1250         /* This code is only used by the receiver when it is building
1251          * a list of files for a delete pass. */
1252         if (keep_dirlinks && linkname_len && flist) {
1253                 STRUCT_STAT st2;
1254                 int save_mode = file->mode;
1255                 file->mode = S_IFDIR; /* Find a directory with our name. */
1256                 if (flist_find(dir_flist, file) >= 0
1257                  && x_stat(thisname, &st2, NULL) == 0 && S_ISDIR(st2.st_mode)) {
1258                         file->modtime = st2.st_mtime;
1259                         file->len32 = 0;
1260                         file->mode = st2.st_mode;
1261                         if (uid_ndx)
1262                                 F_OWNER(file) = st2.st_uid;
1263                         if (gid_ndx)
1264                                 F_GROUP(file) = st2.st_gid;
1265                 } else
1266                         file->mode = save_mode;
1267         }
1268
1269         if (basename_len == 0+1) {
1270                 if (!pool)
1271                         unmake_file(file);
1272                 return NULL;
1273         }
1274
1275         if (unsort_ndx)
1276                 F_NDX(file) = dir_count;
1277
1278         return file;
1279 }
1280
1281 /* Only called for temporary file_struct entries created by make_file(). */
1282 void unmake_file(struct file_struct *file)
1283 {
1284         free(REQ_EXTRA(file, F_DEPTH(file)));
1285 }
1286
1287 static struct file_struct *send_file_name(int f, struct file_list *flist,
1288                                           const char *fname, STRUCT_STAT *stp,
1289                                           int flags, int filter_level)
1290 {
1291         struct file_struct *file;
1292
1293         file = make_file(fname, flist, stp, flags, filter_level);
1294         if (!file)
1295                 return NULL;
1296
1297         if (chmod_modes && !S_ISLNK(file->mode))
1298                 file->mode = tweak_mode(file->mode, chmod_modes);
1299
1300         if (f >= 0) {
1301                 char fbuf[MAXPATHLEN];
1302 #if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
1303                 stat_x sx;
1304 #endif
1305
1306 #ifdef ICONV_OPTION
1307                 if (ic_send != (iconv_t)-1) {
1308                         xbuf outbuf, inbuf;
1309
1310                         INIT_CONST_XBUF(outbuf, fbuf);
1311
1312                         if (file->dirname) {
1313                                 INIT_XBUF_STRLEN(inbuf, (char*)file->dirname);
1314                                 outbuf.size -= 2; /* Reserve room for '/' & 1 more char. */
1315                                 if (iconvbufs(ic_send, &inbuf, &outbuf, 0) < 0)
1316                                         goto convert_error;
1317                                 outbuf.size += 2;
1318                                 outbuf.buf[outbuf.len++] = '/';
1319                         }
1320
1321                         INIT_XBUF_STRLEN(inbuf, (char*)file->basename);
1322                         if (iconvbufs(ic_send, &inbuf, &outbuf, 0) < 0) {
1323                           convert_error:
1324                                 io_error |= IOERR_GENERAL;
1325                                 rprintf(FINFO,
1326                                     "[%s] cannot convert filename: %s (%s)\n",
1327                                     who_am_i(), f_name(file, fbuf), strerror(errno));
1328                                 return NULL;
1329                         }
1330                         outbuf.buf[outbuf.len] = '\0';
1331                 } else
1332 #endif
1333                         f_name(file, fbuf);
1334
1335 #ifdef SUPPORT_ACLS
1336                 if (preserve_acls && !S_ISLNK(file->mode)) {
1337                         sx.st.st_mode = file->mode;
1338                         sx.acc_acl = sx.def_acl = NULL;
1339                         if (get_acl(fname, &sx) < 0)
1340                                 return NULL;
1341                 }
1342 #endif
1343 #ifdef SUPPORT_XATTRS
1344                 if (preserve_xattrs) {
1345                         sx.xattr = NULL;
1346                         if (get_xattr(fname, &sx) < 0)
1347                                 return NULL;
1348                 }
1349 #endif
1350
1351                 send_file_entry(f, fbuf, file, flist->used, flist->ndx_start);
1352
1353 #ifdef SUPPORT_ACLS
1354                 if (preserve_acls && !S_ISLNK(file->mode)) {
1355                         send_acl(&sx, f);
1356                         free_acl(&sx);
1357                 }
1358 #endif
1359 #ifdef SUPPORT_XATTRS
1360                 if (preserve_xattrs) {
1361                         F_XATTR(file) = send_xattr(&sx, f);
1362                         free_xattr(&sx);
1363                 }
1364 #endif
1365         }
1366
1367         maybe_emit_filelist_progress(flist->used + flist_count_offset);
1368
1369         flist_expand(flist, 1);
1370         flist->files[flist->used++] = file;
1371
1372         return file;
1373 }
1374
1375 static void send_if_directory(int f, struct file_list *flist,
1376                               struct file_struct *file,
1377                               char *fbuf, unsigned int ol,
1378                               int flags)
1379 {
1380         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1381
1382         if (S_ISDIR(file->mode)
1383             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1384                 void *save_filters;
1385                 unsigned int len = strlen(fbuf);
1386                 if (len > 1 && fbuf[len-1] == '/')
1387                         fbuf[--len] = '\0';
1388                 if (len >= MAXPATHLEN - 1) {
1389                         io_error |= IOERR_GENERAL;
1390                         rprintf(FERROR_XFER, "skipping long-named directory: %s\n",
1391                                 full_fname(fbuf));
1392                         return;
1393                 }
1394                 save_filters = push_local_filters(fbuf, len);
1395                 send_directory(f, flist, fbuf, len, flags);
1396                 pop_local_filters(save_filters);
1397                 fbuf[ol] = '\0';
1398                 if (is_dot_dir)
1399                         fbuf[ol-1] = '.';
1400         }
1401 }
1402
1403 static int file_compare(const void *file1, const void *file2)
1404 {
1405         return f_name_cmp(*(struct file_struct **)file1,
1406                           *(struct file_struct **)file2);
1407 }
1408
1409 /* The guts of a merge-sort algorithm.  This was derived from the glibc
1410  * version, but I (Wayne) changed the merge code to do less copying and
1411  * to require only half the amount of temporary memory. */
1412 static void fsort_tmp(struct file_struct **fp, size_t num,
1413                       struct file_struct **tmp)
1414 {
1415         struct file_struct **f1, **f2, **t;
1416         size_t n1, n2;
1417
1418         n1 = num / 2;
1419         n2 = num - n1;
1420         f1 = fp;
1421         f2 = fp + n1;
1422
1423         if (n1 > 1)
1424                 fsort_tmp(f1, n1, tmp);
1425         if (n2 > 1)
1426                 fsort_tmp(f2, n2, tmp);
1427
1428         while (f_name_cmp(*f1, *f2) <= 0) {
1429                 if (!--n1)
1430                         return;
1431                 f1++;
1432         }
1433
1434         t = tmp;
1435         memcpy(t, f1, n1 * PTR_SIZE);
1436
1437         *f1++ = *f2++, n2--;
1438
1439         while (n1 > 0 && n2 > 0) {
1440                 if (f_name_cmp(*t, *f2) <= 0)
1441                         *f1++ = *t++, n1--;
1442                 else
1443                         *f1++ = *f2++, n2--;
1444         }
1445
1446         if (n1 > 0)
1447                 memcpy(f1, t, n1 * PTR_SIZE);
1448 }
1449
1450 /* This file-struct sorting routine makes sure that any identical names in
1451  * the file list stay in the same order as they were in the original list.
1452  * This is particularly vital in inc_recurse mode where we expect a sort
1453  * on the flist to match the exact order of a sort on the dir_flist. */
1454 static void fsort(struct file_struct **fp, size_t num)
1455 {
1456         if (num <= 1)
1457                 return;
1458
1459         if (use_qsort)
1460                 qsort(fp, num, PTR_SIZE, file_compare);
1461         else {
1462                 struct file_struct **tmp = new_array(struct file_struct *,
1463                                                      (num+1) / 2);
1464                 fsort_tmp(fp, num, tmp);
1465                 free(tmp);
1466         }
1467 }
1468
1469 /* We take an entire set of sibling dirs from the sorted flist and link them
1470  * into the tree, setting the appropriate parent/child/sibling pointers. */
1471 static void add_dirs_to_tree(int parent_ndx, struct file_list *from_flist,
1472                              int dir_cnt)
1473 {
1474         int i;
1475         int32 *dp = NULL;
1476         int32 *parent_dp = parent_ndx < 0 ? NULL
1477                          : F_DIR_NODE_P(dir_flist->sorted[parent_ndx]);
1478
1479         flist_expand(dir_flist, dir_cnt);
1480         dir_flist->sorted = dir_flist->files;
1481
1482         for (i = 0; dir_cnt; i++) {
1483                 struct file_struct *file = from_flist->sorted[i];
1484
1485                 if (!S_ISDIR(file->mode))
1486                         continue;
1487
1488                 dir_flist->files[dir_flist->used++] = file;
1489                 dir_cnt--;
1490
1491                 if (file->basename[0] == '.' && file->basename[1] == '\0')
1492                         continue;
1493
1494                 if (dp)
1495                         DIR_NEXT_SIBLING(dp) = dir_flist->used - 1;
1496                 else if (parent_dp)
1497                         DIR_FIRST_CHILD(parent_dp) = dir_flist->used - 1;
1498                 else
1499                         send_dir_ndx = dir_flist->used - 1;
1500
1501                 dp = F_DIR_NODE_P(file);
1502                 DIR_PARENT(dp) = parent_ndx;
1503                 DIR_FIRST_CHILD(dp) = -1;
1504         }
1505         if (dp)
1506                 DIR_NEXT_SIBLING(dp) = -1;
1507 }
1508
1509 /* This function is normally called by the sender, but the receiving side also
1510  * calls it from get_dirlist() with f set to -1 so that we just construct the
1511  * file list in memory without sending it over the wire.  Also, get_dirlist()
1512  * might call this with f set to -2, which also indicates that local filter
1513  * rules should be ignored. */
1514 static void send_directory(int f, struct file_list *flist, char *fbuf, int len,
1515                            int flags)
1516 {
1517         struct dirent *di;
1518         unsigned remainder;
1519         char *p;
1520         DIR *d;
1521         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1522         int start = flist->used;
1523         int filter_level = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1524
1525         assert(flist != NULL);
1526
1527         if (!(d = opendir(fbuf))) {
1528                 io_error |= IOERR_GENERAL;
1529                 rsyserr(FERROR_XFER, errno, "opendir %s failed", full_fname(fbuf));
1530                 return;
1531         }
1532
1533         p = fbuf + len;
1534         if (len != 1 || *fbuf != '/')
1535                 *p++ = '/';
1536         *p = '\0';
1537         remainder = MAXPATHLEN - (p - fbuf);
1538
1539         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1540                 char *dname = d_name(di);
1541                 if (dname[0] == '.' && (dname[1] == '\0'
1542                     || (dname[1] == '.' && dname[2] == '\0')))
1543                         continue;
1544                 if (strlcpy(p, dname, remainder) >= remainder) {
1545                         io_error |= IOERR_GENERAL;
1546                         rprintf(FINFO,
1547                                 "cannot send long-named file %s\n",
1548                                 full_fname(fbuf));
1549                         continue;
1550                 }
1551                 if (dname[0] == '\0') {
1552                         io_error |= IOERR_GENERAL;
1553                         rprintf(FINFO,
1554                                 "cannot send file with empty name in %s\n",
1555                                 full_fname(fbuf));
1556                         continue;
1557                 }
1558
1559                 send_file_name(f, flist, fbuf, NULL, flags, filter_level);
1560         }
1561
1562         fbuf[len] = '\0';
1563
1564         if (errno) {
1565                 io_error |= IOERR_GENERAL;
1566                 rsyserr(FERROR_XFER, errno, "readdir(%s)", full_fname(fbuf));
1567         }
1568
1569         closedir(d);
1570
1571         if (f >= 0 && recurse && !divert_dirs) {
1572                 int i, end = flist->used - 1;
1573                 /* send_if_directory() bumps flist->used, so use "end". */
1574                 for (i = start; i <= end; i++)
1575                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1576         }
1577 }
1578
1579 static void send_implied_dirs(int f, struct file_list *flist, char *fname,
1580                               char *start, char *limit, int flags, char name_type)
1581 {
1582         static char lastpath[MAXPATHLEN] = "";
1583         static int lastpath_len = 0;
1584         static struct file_struct *lastpath_struct = NULL;
1585         struct file_struct *file;
1586         item_list *relname_list;
1587         relnamecache **rnpp;
1588         int len, need_new_dir, depth = 0;
1589         struct filter_list_struct save_filter_list = filter_list;
1590
1591         flags = (flags | FLAG_IMPLIED_DIR) & ~(FLAG_TOP_DIR | FLAG_CONTENT_DIR);
1592         filter_list.head = filter_list.tail = NULL; /* Don't filter implied dirs. */
1593
1594         if (inc_recurse) {
1595                 if (lastpath_struct && F_PATHNAME(lastpath_struct) == pathname
1596                  && lastpath_len == limit - fname
1597                  && strncmp(lastpath, fname, lastpath_len) == 0)
1598                         need_new_dir = 0;
1599                 else
1600                         need_new_dir = 1;
1601         } else {
1602                 char *tp = fname, *lp = lastpath;
1603                 /* Skip any initial directories in our path that we
1604                  * have in common with lastpath. */
1605                 assert(start == fname);
1606                 for ( ; ; tp++, lp++) {
1607                         if (tp == limit) {
1608                                 if (*lp == '/' || *lp == '\0')
1609                                         goto done;
1610                                 break;
1611                         }
1612                         if (*lp != *tp)
1613                                 break;
1614                         if (*tp == '/') {
1615                                 start = tp;
1616                                 depth++;
1617                         }
1618                 }
1619                 need_new_dir = 1;
1620         }
1621
1622         if (need_new_dir) {
1623                 int save_copy_links = copy_links;
1624                 int save_xfer_dirs = xfer_dirs;
1625                 char *slash;
1626
1627                 copy_links = xfer_dirs = 1;
1628
1629                 *limit = '\0';
1630
1631                 for (slash = start; (slash = strchr(slash+1, '/')) != NULL; ) {
1632                         *slash = '\0';
1633                         file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1634                         depth++;
1635                         if (!inc_recurse && file && S_ISDIR(file->mode))
1636                                 change_local_filter_dir(fname, strlen(fname), depth);
1637                         *slash = '/';
1638                 }
1639
1640                 file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1641                 if (inc_recurse) {
1642                         if (file && !S_ISDIR(file->mode))
1643                                 file = NULL;
1644                         lastpath_struct = file;
1645                 } else if (file && S_ISDIR(file->mode))
1646                         change_local_filter_dir(fname, strlen(fname), ++depth);
1647
1648                 strlcpy(lastpath, fname, sizeof lastpath);
1649                 lastpath_len = limit - fname;
1650
1651                 *limit = '/';
1652
1653                 copy_links = save_copy_links;
1654                 xfer_dirs = save_xfer_dirs;
1655
1656                 if (!inc_recurse)
1657                         goto done;
1658         }
1659
1660         if (!lastpath_struct)
1661                 goto done; /* dir must have vanished */
1662
1663         len = strlen(limit+1);
1664         memcpy(&relname_list, F_DIR_RELNAMES_P(lastpath_struct), sizeof relname_list);
1665         if (!relname_list) {
1666                 if (!(relname_list = new0(item_list)))
1667                         out_of_memory("send_implied_dirs");
1668                 memcpy(F_DIR_RELNAMES_P(lastpath_struct), &relname_list, sizeof relname_list);
1669         }
1670         rnpp = EXPAND_ITEM_LIST(relname_list, relnamecache *, 32);
1671         if (!(*rnpp = (relnamecache*)new_array(char, sizeof (relnamecache) + len)))
1672                 out_of_memory("send_implied_dirs");
1673         (*rnpp)->name_type = name_type;
1674         strlcpy((*rnpp)->fname, limit+1, len + 1);
1675
1676 done:
1677         filter_list = save_filter_list;
1678 }
1679
1680 static void send1extra(int f, struct file_struct *file, struct file_list *flist)
1681 {
1682         char fbuf[MAXPATHLEN];
1683         item_list *relname_list;
1684         int len, dlen, flags = FLAG_DIVERT_DIRS | FLAG_CONTENT_DIR;
1685         size_t j;
1686
1687         f_name(file, fbuf);
1688         dlen = strlen(fbuf);
1689
1690         if (!change_pathname(file, NULL, 0))
1691                 exit_cleanup(RERR_FILESELECT);
1692
1693         change_local_filter_dir(fbuf, dlen, send_dir_depth);
1694
1695         if (file->flags & FLAG_CONTENT_DIR) {
1696                 if (one_file_system) {
1697                         STRUCT_STAT st;
1698                         if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1699                                 io_error |= IOERR_GENERAL;
1700                                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
1701                                         full_fname(fbuf));
1702                                 return;
1703                         }
1704                         filesystem_dev = st.st_dev;
1705                 }
1706                 send_directory(f, flist, fbuf, dlen, flags);
1707         }
1708
1709         if (!relative_paths)
1710                 return;
1711
1712         memcpy(&relname_list, F_DIR_RELNAMES_P(file), sizeof relname_list);
1713         if (!relname_list)
1714                 return;
1715
1716         for (j = 0; j < relname_list->count; j++) {
1717                 char *slash;
1718                 relnamecache *rnp = ((relnamecache**)relname_list->items)[j];
1719                 char name_type = rnp->name_type;
1720
1721                 fbuf[dlen] = '/';
1722                 len = strlcpy(fbuf + dlen + 1, rnp->fname, sizeof fbuf - dlen - 1);
1723                 free(rnp);
1724                 if (len >= (int)sizeof fbuf)
1725                         continue; /* Impossible... */
1726
1727                 slash = strchr(fbuf+dlen+1, '/');
1728                 if (slash) {
1729                         send_implied_dirs(f, flist, fbuf, fbuf+dlen+1, slash, flags, name_type);
1730                         continue;
1731                 }
1732
1733                 if (name_type != NORMAL_NAME) {
1734                         STRUCT_STAT st;
1735                         if (link_stat(fbuf, &st, 1) != 0) {
1736                                 io_error |= IOERR_GENERAL;
1737                                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
1738                                         full_fname(fbuf));
1739                                 continue;
1740                         }
1741                         send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR | flags, ALL_FILTERS);
1742                 } else
1743                         send_file_name(f, flist, fbuf, NULL, FLAG_TOP_DIR | flags, ALL_FILTERS);
1744         }
1745
1746         free(relname_list);
1747 }
1748
1749 void send_extra_file_list(int f, int at_least)
1750 {
1751         struct file_list *flist;
1752         int64 start_write;
1753         uint16 prev_flags;
1754         int old_cnt, save_io_error = io_error;
1755
1756         if (flist_eof)
1757                 return;
1758
1759         /* Keep sending data until we have the requested number of
1760          * files in the upcoming file-lists. */
1761         old_cnt = cur_flist->used;
1762         for (flist = first_flist; flist != cur_flist; flist = flist->next)
1763                 old_cnt += flist->used;
1764         while (file_total - old_cnt < at_least) {
1765                 struct file_struct *file = dir_flist->sorted[send_dir_ndx];
1766                 int dir_ndx, dstart = dir_count;
1767                 const char *pathname = F_PATHNAME(file);
1768                 int32 *dp;
1769
1770                 flist = flist_new(0, "send_extra_file_list");
1771                 start_write = stats.total_written;
1772
1773                 if (unsort_ndx)
1774                         dir_ndx = F_NDX(file);
1775                 else
1776                         dir_ndx = send_dir_ndx;
1777                 write_ndx(f, NDX_FLIST_OFFSET - dir_ndx);
1778                 flist->parent_ndx = dir_ndx;
1779
1780                 send1extra(f, file, flist);
1781                 prev_flags = file->flags;
1782                 dp = F_DIR_NODE_P(file);
1783
1784                 /* If there are any duplicate directory names that follow, we
1785                  * send all the dirs together in one file-list.  The dir_flist
1786                  * tree links all the child subdirs onto the last dup dir. */
1787                 while ((dir_ndx = DIR_NEXT_SIBLING(dp)) >= 0
1788                     && dir_flist->sorted[dir_ndx]->flags & FLAG_DUPLICATE) {
1789                         send_dir_ndx = dir_ndx;
1790                         file = dir_flist->sorted[dir_ndx];
1791                         /* Try to avoid some duplicate scanning of identical dirs. */
1792                         if (F_PATHNAME(file) == pathname && prev_flags & FLAG_CONTENT_DIR)
1793                                 file->flags &= ~FLAG_CONTENT_DIR;
1794                         send1extra(f, file, flist);
1795                         prev_flags = file->flags;
1796                         dp = F_DIR_NODE_P(file);
1797                 }
1798
1799                 write_byte(f, 0);
1800
1801                 if (need_unsorted_flist) {
1802                         if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
1803                                 out_of_memory("send_extra_file_list");
1804                         memcpy(flist->sorted, flist->files,
1805                                flist->used * sizeof (struct file_struct*));
1806                 } else
1807                         flist->sorted = flist->files;
1808
1809                 flist_sort_and_clean(flist, 0);
1810
1811                 add_dirs_to_tree(send_dir_ndx, flist, dir_count - dstart);
1812                 flist_done_allocating(flist);
1813
1814                 file_total += flist->used;
1815                 stats.flist_size += stats.total_written - start_write;
1816                 stats.num_files += flist->used;
1817                 if (verbose > 3)
1818                         output_flist(flist);
1819
1820                 if (DIR_FIRST_CHILD(dp) >= 0) {
1821                         send_dir_ndx = DIR_FIRST_CHILD(dp);
1822                         send_dir_depth++;
1823                 } else {
1824                         while (DIR_NEXT_SIBLING(dp) < 0) {
1825                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
1826                                         write_ndx(f, NDX_FLIST_EOF);
1827                                         flist_eof = 1;
1828                                         change_local_filter_dir(NULL, 0, 0);
1829                                         goto finish;
1830                                 }
1831                                 send_dir_depth--;
1832                                 file = dir_flist->sorted[send_dir_ndx];
1833                                 dp = F_DIR_NODE_P(file);
1834                         }
1835                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
1836                 }
1837         }
1838
1839   finish:
1840         if (io_error != save_io_error && !ignore_errors)
1841                 send_msg_int(MSG_IO_ERROR, io_error);
1842 }
1843
1844 struct file_list *send_file_list(int f, int argc, char *argv[])
1845 {
1846         static const char *lastdir;
1847         static int lastdir_len = -1;
1848         int len, dirlen;
1849         STRUCT_STAT st;
1850         char *p, *dir;
1851         struct file_list *flist;
1852         struct timeval start_tv, end_tv;
1853         int64 start_write;
1854         int use_ff_fd = 0;
1855         int disable_buffering;
1856         int arg_flags, flags = recurse ? FLAG_CONTENT_DIR : 0;
1857         int reading_remotely = filesfrom_host != NULL;
1858         int rl_flags = (reading_remotely ? 0 : RL_DUMP_COMMENTS)
1859 #ifdef ICONV_OPTION
1860                      | (filesfrom_convert ? RL_CONVERT : 0)
1861 #endif
1862                      | (eol_nulls || reading_remotely ? RL_EOL_NULLS : 0);
1863         int implied_dot_dir = 0;
1864
1865         rprintf(FLOG, "building file list\n");
1866         if (show_filelist_p())
1867                 start_filelist_progress("building file list");
1868         else if (inc_recurse && verbose && !am_server)
1869                 rprintf(FCLIENT, "sending incremental file list\n");
1870
1871         start_write = stats.total_written;
1872         gettimeofday(&start_tv, NULL);
1873
1874         if (!orig_dir)
1875                 orig_dir = strdup(curr_dir);
1876
1877         if (relative_paths && protocol_version >= 30)
1878                 implied_dirs = 1; /* We send flagged implied dirs */
1879
1880 #ifdef SUPPORT_HARD_LINKS
1881         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
1882                 init_hard_links();
1883 #endif
1884
1885         flist = cur_flist = flist_new(0, "send_file_list");
1886         if (inc_recurse) {
1887                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
1888                 flags |= FLAG_DIVERT_DIRS;
1889         } else
1890                 dir_flist = cur_flist;
1891
1892         disable_buffering = io_start_buffering_out(f);
1893         if (filesfrom_fd >= 0) {
1894                 if (argv[0] && !change_dir(argv[0], CD_NORMAL)) {
1895                         rsyserr(FERROR_XFER, errno, "change_dir %s failed",
1896                                 full_fname(argv[0]));
1897                         exit_cleanup(RERR_FILESELECT);
1898                 }
1899                 use_ff_fd = 1;
1900         }
1901
1902         while (1) {
1903                 char fbuf[MAXPATHLEN], *fn, name_type;
1904
1905                 if (use_ff_fd) {
1906                         if (read_line(filesfrom_fd, fbuf, sizeof fbuf, rl_flags) == 0)
1907                                 break;
1908                         sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
1909                 } else {
1910                         if (argc-- == 0)
1911                                 break;
1912                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1913                         if (sanitize_paths)
1914                                 sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
1915                 }
1916
1917                 len = strlen(fbuf);
1918                 if (relative_paths) {
1919                         /* We clean up fbuf below. */
1920                         name_type = NORMAL_NAME;
1921                 } else if (!len || fbuf[len - 1] == '/') {
1922                         if (len == 2 && fbuf[0] == '.') {
1923                                 /* Turn "./" into just "." rather than "./." */
1924                                 fbuf[--len] = '\0';
1925                         } else {
1926                                 if (len + 1 >= MAXPATHLEN)
1927                                         overflow_exit("send_file_list");
1928                                 fbuf[len++] = '.';
1929                                 fbuf[len] = '\0';
1930                         }
1931                         name_type = DOTDIR_NAME;
1932                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1933                     && (len == 2 || fbuf[len-3] == '/')) {
1934                         if (len + 2 >= MAXPATHLEN)
1935                                 overflow_exit("send_file_list");
1936                         fbuf[len++] = '/';
1937                         fbuf[len++] = '.';
1938                         fbuf[len] = '\0';
1939                         name_type = DOTDIR_NAME;
1940                 } else if (fbuf[len-1] == '.' && (len == 1 || fbuf[len-2] == '/'))
1941                         name_type = DOTDIR_NAME;
1942                 else
1943                         name_type = NORMAL_NAME;
1944
1945                 dir = NULL;
1946
1947                 if (!relative_paths) {
1948                         p = strrchr(fbuf, '/');
1949                         if (p) {
1950                                 *p = '\0';
1951                                 if (p == fbuf)
1952                                         dir = "/";
1953                                 else
1954                                         dir = fbuf;
1955                                 len -= p - fbuf + 1;
1956                                 fn = p + 1;
1957                         } else
1958                                 fn = fbuf;
1959                 } else {
1960                         if ((p = strstr(fbuf, "/./")) != NULL) {
1961                                 *p = '\0';
1962                                 if (p == fbuf)
1963                                         dir = "/";
1964                                 else {
1965                                         dir = fbuf;
1966                                         clean_fname(dir, 0);
1967                                 }
1968                                 fn = p + 3;
1969                                 while (*fn == '/')
1970                                         fn++;
1971                                 if (!*fn)
1972                                         *--fn = '\0'; /* ensure room for '.' */
1973                         } else
1974                                 fn = fbuf;
1975                         /* A leading ./ can be used in relative mode to affect
1976                          * the dest dir without its name being in the path. */
1977                         if (*fn == '.' && fn[1] == '/' && !implied_dot_dir) {
1978                                 send_file_name(f, flist, ".", NULL,
1979                                     (flags | FLAG_IMPLIED_DIR) & ~FLAG_CONTENT_DIR,
1980                                     ALL_FILTERS);
1981                                 implied_dot_dir = 1;
1982                         }
1983                         len = clean_fname(fn, CFN_KEEP_TRAILING_SLASH
1984                                             | CFN_DROP_TRAILING_DOT_DIR);
1985                         if (len == 1) {
1986                                 if (fn[0] == '/') {
1987                                         fn = "/.";
1988                                         len = 2;
1989                                         name_type = DOTDIR_NAME;
1990                                 } else if (fn[0] == '.')
1991                                         name_type = DOTDIR_NAME;
1992                         } else if (fn[len-1] == '/') {
1993                                 fn[--len] = '\0';
1994                                 if (len == 1 && *fn == '.')
1995                                         name_type = DOTDIR_NAME;
1996                                 else
1997                                         name_type = SLASH_ENDING_NAME;
1998                         }
1999                         /* Reject a ".." dir in the active part of the path. */
2000                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
2001                                 if ((p[2] == '/' || p[2] == '\0')
2002                                  && (p == fn || p[-1] == '/')) {
2003                                         rprintf(FERROR,
2004                                             "found \"..\" dir in relative path: %s\n",
2005                                             fn);
2006                                         exit_cleanup(RERR_SYNTAX);
2007                                 }
2008                         }
2009                 }
2010
2011                 if (!*fn) {
2012                         len = 1;
2013                         fn = ".";
2014                         name_type = DOTDIR_NAME;
2015                 }
2016
2017                 dirlen = dir ? strlen(dir) : 0;
2018                 if (dirlen != lastdir_len || memcmp(lastdir, dir, dirlen) != 0) {
2019                         if (!change_pathname(NULL, dir, -dirlen))
2020                                 continue;
2021                         lastdir = pathname;
2022                         lastdir_len = pathname_len;
2023                 } else if (!change_pathname(NULL, lastdir, lastdir_len))
2024                         continue;
2025
2026                 if (fn != fbuf)
2027                         memmove(fbuf, fn, len + 1);
2028
2029                 if (link_stat(fbuf, &st, copy_dirlinks || name_type != NORMAL_NAME) != 0
2030                  || (name_type != DOTDIR_NAME && is_daemon_excluded(fbuf, S_ISDIR(st.st_mode)))
2031                  || (relative_paths && path_is_daemon_excluded(fbuf, 1))) {
2032                         io_error |= IOERR_GENERAL;
2033                         rsyserr(FERROR_XFER, errno, "link_stat %s failed",
2034                                 full_fname(fbuf));
2035                         continue;
2036                 }
2037
2038                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
2039                         rprintf(FINFO, "skipping directory %s\n", fbuf);
2040                         continue;
2041                 }
2042
2043                 if (inc_recurse && relative_paths && *fbuf) {
2044                         if ((p = strchr(fbuf+1, '/')) != NULL) {
2045                                 if (p - fbuf == 1 && *fbuf == '.') {
2046                                         if ((fn = strchr(p+1, '/')) != NULL)
2047                                                 p = fn;
2048                                 } else
2049                                         fn = p;
2050                                 send_implied_dirs(f, flist, fbuf, fbuf, p, flags, name_type);
2051                                 if (fn == p)
2052                                         continue;
2053                         }
2054                 } else if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
2055                         /* Send the implied directories at the start of the
2056                          * source spec, so we get their permissions right. */
2057                         send_implied_dirs(f, flist, fbuf, fbuf, p, flags, 0);
2058                 }
2059
2060                 if (one_file_system)
2061                         filesystem_dev = st.st_dev;
2062
2063                 arg_flags = name_type == DOTDIR_NAME ? FLAG_DOTDIR_NAME : 0;
2064
2065                 if (recurse || (xfer_dirs && name_type != NORMAL_NAME)) {
2066                         struct file_struct *file;
2067                         arg_flags |= FLAG_TOP_DIR | FLAG_CONTENT_DIR;
2068                         file = send_file_name(f, flist, fbuf, &st,
2069                                               arg_flags | flags, ALL_FILTERS);
2070                         if (!file)
2071                                 continue;
2072                         if (inc_recurse) {
2073                                 if (name_type == DOTDIR_NAME) {
2074                                         if (send_dir_depth < 0) {
2075                                                 send_dir_depth = 0;
2076                                                 change_local_filter_dir(fbuf, len, send_dir_depth);
2077                                         }
2078                                         send_directory(f, flist, fbuf, len, flags);
2079                                 }
2080                         } else
2081                                 send_if_directory(f, flist, file, fbuf, len, flags);
2082                 } else
2083                         send_file_name(f, flist, fbuf, &st, arg_flags | flags, ALL_FILTERS);
2084         }
2085
2086         gettimeofday(&end_tv, NULL);
2087         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2088                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2089         if (stats.flist_buildtime == 0)
2090                 stats.flist_buildtime = 1;
2091         start_tv = end_tv;
2092
2093         write_byte(f, 0); /* Indicate end of file list */
2094
2095 #ifdef SUPPORT_HARD_LINKS
2096         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
2097                 idev_destroy();
2098 #endif
2099
2100         if (show_filelist_p())
2101                 finish_filelist_progress(flist);
2102
2103         gettimeofday(&end_tv, NULL);
2104         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2105                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2106
2107         /* When converting names, both sides keep an unsorted file-list array
2108          * because the names will differ on the sending and receiving sides
2109          * (both sides will use the unsorted index number for each item). */
2110
2111         /* Sort the list without removing any duplicates.  This allows the
2112          * receiving side to ask for whatever name it kept.  For incremental
2113          * recursion mode, the sender marks duplicate dirs so that it can
2114          * send them together in a single file-list. */
2115         if (need_unsorted_flist) {
2116                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2117                         out_of_memory("send_file_list");
2118                 memcpy(flist->sorted, flist->files,
2119                        flist->used * sizeof (struct file_struct*));
2120         } else
2121                 flist->sorted = flist->files;
2122         flist_sort_and_clean(flist, 0);
2123         file_total += flist->used;
2124
2125         if (numeric_ids <= 0 && !inc_recurse)
2126                 send_id_list(f);
2127
2128         /* send the io_error flag */
2129         if (protocol_version < 30)
2130                 write_int(f, ignore_errors ? 0 : io_error);
2131         else if (io_error && !ignore_errors)
2132                 send_msg_int(MSG_IO_ERROR, io_error);
2133
2134         if (disable_buffering)
2135                 io_end_buffering_out();
2136
2137         stats.flist_size = stats.total_written - start_write;
2138         stats.num_files = flist->used;
2139
2140         if (verbose > 3)
2141                 output_flist(flist);
2142
2143         if (verbose > 2)
2144                 rprintf(FINFO, "send_file_list done\n");
2145
2146         if (inc_recurse) {
2147                 send_dir_depth = 1;
2148                 add_dirs_to_tree(-1, flist, dir_count);
2149                 if (!file_total || strcmp(flist->sorted[0]->basename, ".") != 0)
2150                         flist->parent_ndx = -1;
2151                 flist_done_allocating(flist);
2152                 if (send_dir_ndx < 0) {
2153                         write_ndx(f, NDX_FLIST_EOF);
2154                         flist_eof = 1;
2155                 }
2156                 else if (file_total == 1) {
2157                         /* If we're creating incremental file-lists and there
2158                          * was just 1 item in the first file-list, send 1 more
2159                          * file-list to check if this is a 1-file xfer. */
2160                         send_extra_file_list(f, 1);
2161                 }
2162         }
2163
2164         return flist;
2165 }
2166
2167 struct file_list *recv_file_list(int f)
2168 {
2169         struct file_list *flist;
2170         int dstart, flags;
2171         int64 start_read;
2172
2173         if (!first_flist)
2174                 rprintf(FLOG, "receiving file list\n");
2175         if (show_filelist_p())
2176                 start_filelist_progress("receiving file list");
2177         else if (inc_recurse && verbose && !am_server && !first_flist)
2178                 rprintf(FCLIENT, "receiving incremental file list\n");
2179
2180         start_read = stats.total_read;
2181
2182 #ifdef SUPPORT_HARD_LINKS
2183         if (preserve_hard_links && !first_flist)
2184                 init_hard_links();
2185 #endif
2186
2187         flist = flist_new(0, "recv_file_list");
2188
2189         if (inc_recurse) {
2190                 if (flist->ndx_start == 1)
2191                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
2192                 dstart = dir_flist->used;
2193         } else {
2194                 dir_flist = flist;
2195                 dstart = 0;
2196         }
2197
2198         while ((flags = read_byte(f)) != 0) {
2199                 struct file_struct *file;
2200
2201                 flist_expand(flist, 1);
2202
2203                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
2204                         flags |= read_byte(f) << 8;
2205                 file = recv_file_entry(flist, flags, f);
2206
2207                 if (inc_recurse && S_ISDIR(file->mode)) {
2208                         flist_expand(dir_flist, 1);
2209                         dir_flist->files[dir_flist->used++] = file;
2210                 }
2211
2212                 flist->files[flist->used++] = file;
2213
2214                 maybe_emit_filelist_progress(flist->used);
2215
2216                 if (verbose > 2) {
2217                         rprintf(FINFO, "recv_file_name(%s)\n",
2218                                 f_name(file, NULL));
2219                 }
2220         }
2221         file_total += flist->used;
2222
2223         if (verbose > 2)
2224                 rprintf(FINFO, "received %d names\n", flist->used);
2225
2226         if (show_filelist_p())
2227                 finish_filelist_progress(flist);
2228
2229         if (need_unsorted_flist) {
2230                 /* Create an extra array of index pointers that we can sort for
2231                  * the generator's use (for wading through the files in sorted
2232                  * order and for calling flist_find()).  We keep the "files"
2233                  * list unsorted for our exchange of index numbers with the
2234                  * other side (since their names may not sort the same). */
2235                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2236                         out_of_memory("recv_file_list");
2237                 memcpy(flist->sorted, flist->files,
2238                        flist->used * sizeof (struct file_struct*));
2239                 if (inc_recurse && dir_flist->used > dstart) {
2240                         static int dir_flist_malloced = 0;
2241                         if (dir_flist_malloced < dir_flist->malloced) {
2242                                 dir_flist->sorted = realloc_array(dir_flist->sorted,
2243                                                         struct file_struct *,
2244                                                         dir_flist->malloced);
2245                                 dir_flist_malloced = dir_flist->malloced;
2246                         }
2247                         memcpy(dir_flist->sorted + dstart, dir_flist->files + dstart,
2248                                (dir_flist->used - dstart) * sizeof (struct file_struct*));
2249                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2250                 }
2251         } else {
2252                 flist->sorted = flist->files;
2253                 if (inc_recurse && dir_flist->used > dstart) {
2254                         dir_flist->sorted = dir_flist->files;
2255                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2256                 }
2257         }
2258
2259         if (inc_recurse)
2260                 flist_done_allocating(flist);
2261         else if (f >= 0)
2262                 recv_id_list(f, flist);
2263
2264         flist_sort_and_clean(flist, relative_paths);
2265
2266         if (protocol_version < 30) {
2267                 /* Recv the io_error flag */
2268                 if (ignore_errors)
2269                         read_int(f);
2270                 else
2271                         io_error |= read_int(f);
2272         } else if (inc_recurse && flist->ndx_start == 1) {
2273                 if (!file_total || strcmp(flist->sorted[0]->basename, ".") != 0)
2274                         flist->parent_ndx = -1;
2275         }
2276
2277         if (verbose > 3)
2278                 output_flist(flist);
2279
2280         if (verbose > 2)
2281                 rprintf(FINFO, "recv_file_list done\n");
2282
2283         stats.flist_size += stats.total_read - start_read;
2284         stats.num_files += flist->used;
2285
2286         return flist;
2287 }
2288
2289 /* This is only used once by the receiver if the very first file-list
2290  * has exactly one item in it. */
2291 void recv_additional_file_list(int f)
2292 {
2293         struct file_list *flist;
2294         int ndx = read_ndx(f);
2295         if (ndx == NDX_FLIST_EOF) {
2296                 flist_eof = 1;
2297                 change_local_filter_dir(NULL, 0, 0);
2298         } else {
2299                 ndx = NDX_FLIST_OFFSET - ndx;
2300                 if (ndx < 0 || ndx >= dir_flist->used) {
2301                         ndx = NDX_FLIST_OFFSET - ndx;
2302                         rprintf(FERROR,
2303                                 "[%s] Invalid dir index: %d (%d - %d)\n",
2304                                 who_am_i(), ndx, NDX_FLIST_OFFSET,
2305                                 NDX_FLIST_OFFSET - dir_flist->used + 1);
2306                         exit_cleanup(RERR_PROTOCOL);
2307                 }
2308                 if (verbose > 3) {
2309                         rprintf(FINFO, "[%s] receiving flist for dir %d\n",
2310                                 who_am_i(), ndx);
2311                 }
2312                 flist = recv_file_list(f);
2313                 flist->parent_ndx = ndx;
2314         }
2315 }
2316
2317 /* Search for an identically-named item in the file list.  Note that the
2318  * items must agree in their directory-ness, or no match is returned. */
2319 int flist_find(struct file_list *flist, struct file_struct *f)
2320 {
2321         int low = flist->low, high = flist->high;
2322         int diff, mid, mid_up;
2323
2324         while (low <= high) {
2325                 mid = (low + high) / 2;
2326                 if (F_IS_ACTIVE(flist->sorted[mid]))
2327                         mid_up = mid;
2328                 else {
2329                         /* Scan for the next non-empty entry using the cached
2330                          * distance values.  If the value isn't fully up-to-
2331                          * date, update it. */
2332                         mid_up = mid + F_DEPTH(flist->sorted[mid]);
2333                         if (!F_IS_ACTIVE(flist->sorted[mid_up])) {
2334                                 do {
2335                                     mid_up += F_DEPTH(flist->sorted[mid_up]);
2336                                 } while (!F_IS_ACTIVE(flist->sorted[mid_up]));
2337                                 F_DEPTH(flist->sorted[mid]) = mid_up - mid;
2338                         }
2339                         if (mid_up > high) {
2340                                 /* If there's nothing left above us, set high to
2341                                  * a non-empty entry below us and continue. */
2342                                 high = mid - (int)flist->sorted[mid]->len32;
2343                                 if (!F_IS_ACTIVE(flist->sorted[high])) {
2344                                         do {
2345                                             high -= (int)flist->sorted[high]->len32;
2346                                         } while (!F_IS_ACTIVE(flist->sorted[high]));
2347                                         flist->sorted[mid]->len32 = mid - high;
2348                                 }
2349                                 continue;
2350                         }
2351                 }
2352                 diff = f_name_cmp(flist->sorted[mid_up], f);
2353                 if (diff == 0) {
2354                         if (protocol_version < 29
2355                             && S_ISDIR(flist->sorted[mid_up]->mode)
2356                             != S_ISDIR(f->mode))
2357                                 return -1;
2358                         return mid_up;
2359                 }
2360                 if (diff < 0)
2361                         low = mid_up + 1;
2362                 else
2363                         high = mid - 1;
2364         }
2365         return -1;
2366 }
2367
2368 /*
2369  * Free up any resources a file_struct has allocated
2370  * and clear the file.
2371  */
2372 void clear_file(struct file_struct *file)
2373 {
2374         /* The +1 zeros out the first char of the basename. */
2375         memset(file, 0, FILE_STRUCT_LEN + 1);
2376         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
2377          * entry.  Likewise for len32 in the opposite direction.  We assume
2378          * that we're alone for now since flist_find() will adjust the counts
2379          * it runs into that aren't up-to-date. */
2380         file->len32 = F_DEPTH(file) = 1;
2381 }
2382
2383 /* Allocate a new file list. */
2384 struct file_list *flist_new(int flags, char *msg)
2385 {
2386         struct file_list *flist;
2387
2388         if (!(flist = new0(struct file_list)))
2389                 out_of_memory(msg);
2390
2391         if (flags & FLIST_TEMP) {
2392                 if (!(flist->file_pool = pool_create(SMALL_EXTENT, 0,
2393                                                 out_of_memory, POOL_INTERN)))
2394                         out_of_memory(msg);
2395         } else {
2396                 /* This is a doubly linked list with prev looping back to
2397                  * the end of the list, but the last next pointer is NULL. */
2398                 if (!first_flist) {
2399                         flist->file_pool = pool_create(NORMAL_EXTENT, 0,
2400                                                 out_of_memory, POOL_INTERN);
2401                         if (!flist->file_pool)
2402                                 out_of_memory(msg);
2403
2404                         flist->ndx_start = flist->flist_num = inc_recurse ? 1 : 0;
2405
2406                         first_flist = cur_flist = flist->prev = flist;
2407                 } else {
2408                         struct file_list *prev = first_flist->prev;
2409
2410                         flist->file_pool = first_flist->file_pool;
2411
2412                         flist->ndx_start = prev->ndx_start + prev->used + 1;
2413                         flist->flist_num = prev->flist_num + 1;
2414
2415                         flist->prev = prev;
2416                         prev->next = first_flist->prev = flist;
2417                 }
2418                 flist->pool_boundary = pool_boundary(flist->file_pool, 0);
2419                 flist_cnt++;
2420         }
2421
2422         return flist;
2423 }
2424
2425 /* Free up all elements in a flist. */
2426 void flist_free(struct file_list *flist)
2427 {
2428         if (!flist->prev) {
2429                 /* Was FLIST_TEMP dir-list. */
2430         } else if (flist == flist->prev) {
2431                 first_flist = cur_flist = NULL;
2432                 file_total = 0;
2433                 flist_cnt = 0;
2434         } else {
2435                 if (flist == cur_flist)
2436                         cur_flist = flist->next;
2437                 if (flist == first_flist)
2438                         first_flist = first_flist->next;
2439                 else {
2440                         flist->prev->next = flist->next;
2441                         if (!flist->next)
2442                                 flist->next = first_flist;
2443                 }
2444                 flist->next->prev = flist->prev;
2445                 file_total -= flist->used;
2446                 flist_cnt--;
2447         }
2448
2449         if (!flist->prev || !flist_cnt)
2450                 pool_destroy(flist->file_pool);
2451         else
2452                 pool_free_old(flist->file_pool, flist->pool_boundary);
2453
2454         if (flist->sorted && flist->sorted != flist->files)
2455                 free(flist->sorted);
2456         free(flist->files);
2457         free(flist);
2458 }
2459
2460 /* This routine ensures we don't have any duplicate names in our file list.
2461  * duplicate names can cause corruption because of the pipelining. */
2462 static void flist_sort_and_clean(struct file_list *flist, int strip_root)
2463 {
2464         char fbuf[MAXPATHLEN];
2465         int i, prev_i;
2466
2467         if (!flist)
2468                 return;
2469         if (flist->used == 0) {
2470                 flist->high = -1;
2471                 flist->low = 0;
2472                 return;
2473         }
2474
2475         fsort(flist->sorted, flist->used);
2476
2477         if (!am_sender || inc_recurse) {
2478                 for (i = prev_i = 0; i < flist->used; i++) {
2479                         if (F_IS_ACTIVE(flist->sorted[i])) {
2480                                 prev_i = i;
2481                                 break;
2482                         }
2483                 }
2484                 flist->low = prev_i;
2485         } else {
2486                 i = prev_i = flist->used - 1;
2487                 flist->low = 0;
2488         }
2489
2490         while (++i < flist->used) {
2491                 int j;
2492                 struct file_struct *file = flist->sorted[i];
2493
2494                 if (!F_IS_ACTIVE(file))
2495                         continue;
2496                 if (f_name_cmp(file, flist->sorted[prev_i]) == 0)
2497                         j = prev_i;
2498                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
2499                         int save_mode = file->mode;
2500                         /* Make sure that this directory doesn't duplicate a
2501                          * non-directory earlier in the list. */
2502                         flist->high = prev_i;
2503                         file->mode = S_IFREG;
2504                         j = flist_find(flist, file);
2505                         file->mode = save_mode;
2506                 } else
2507                         j = -1;
2508                 if (j >= 0) {
2509                         int keep, drop;
2510                         /* If one is a dir and the other is not, we want to
2511                          * keep the dir because it might have contents in the
2512                          * list.  Otherwise keep the first one. */
2513                         if (S_ISDIR(file->mode)) {
2514                                 struct file_struct *fp = flist->sorted[j];
2515                                 if (!S_ISDIR(fp->mode))
2516                                         keep = i, drop = j;
2517                                 else {
2518                                         if (am_sender)
2519                                                 file->flags |= FLAG_DUPLICATE;
2520                                         else { /* Make sure we merge our vital flags. */
2521                                                 fp->flags |= file->flags & (FLAG_TOP_DIR|FLAG_CONTENT_DIR);
2522                                                 fp->flags &= file->flags | ~FLAG_IMPLIED_DIR;
2523                                         }
2524                                         keep = j, drop = i;
2525                                 }
2526                         } else
2527                                 keep = j, drop = i;
2528
2529                         if (!am_sender) {
2530                                 if (verbose > 1) {
2531                                         rprintf(FINFO,
2532                                             "removing duplicate name %s from file list (%d)\n",
2533                                             f_name(file, fbuf), drop + flist->ndx_start);
2534                                 }
2535                                 clear_file(flist->sorted[drop]);
2536                         }
2537
2538                         if (keep == i) {
2539                                 if (flist->low == drop) {
2540                                         for (j = drop + 1;
2541                                              j < i && !F_IS_ACTIVE(flist->sorted[j]);
2542                                              j++) {}
2543                                         flist->low = j;
2544                                 }
2545                                 prev_i = i;
2546                         }
2547                 } else
2548                         prev_i = i;
2549         }
2550         flist->high = prev_i;
2551
2552         if (strip_root) {
2553                 /* We need to strip off the leading slashes for relative
2554                  * paths, but this must be done _after_ the sorting phase. */
2555                 for (i = flist->low; i <= flist->high; i++) {
2556                         struct file_struct *file = flist->sorted[i];
2557
2558                         if (!file->dirname)
2559                                 continue;
2560                         while (*file->dirname == '/')
2561                                 file->dirname++;
2562                         if (!*file->dirname)
2563                                 file->dirname = NULL;
2564                 }
2565         }
2566
2567         if (prune_empty_dirs && !am_sender) {
2568                 int j, prev_depth = 0;
2569
2570                 prev_i = 0; /* It's OK that this isn't really true. */
2571
2572                 for (i = flist->low; i <= flist->high; i++) {
2573                         struct file_struct *fp, *file = flist->sorted[i];
2574
2575                         /* This temporarily abuses the F_DEPTH() value for a
2576                          * directory that is in a chain that might get pruned.
2577                          * We restore the old value if it gets a reprieve. */
2578                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2579                                 /* Dump empty dirs when coming back down. */
2580                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2581                                         fp = flist->sorted[prev_i];
2582                                         if (F_DEPTH(fp) >= 0)
2583                                                 break;
2584                                         prev_i = -F_DEPTH(fp)-1;
2585                                         clear_file(fp);
2586                                 }
2587                                 prev_depth = F_DEPTH(file);
2588                                 if (is_excluded(f_name(file, fbuf), 1,
2589                                                        ALL_FILTERS)) {
2590                                         /* Keep dirs through this dir. */
2591                                         for (j = prev_depth-1; ; j--) {
2592                                                 fp = flist->sorted[prev_i];
2593                                                 if (F_DEPTH(fp) >= 0)
2594                                                         break;
2595                                                 prev_i = -F_DEPTH(fp)-1;
2596                                                 F_DEPTH(fp) = j;
2597                                         }
2598                                 } else
2599                                         F_DEPTH(file) = -prev_i-1;
2600                                 prev_i = i;
2601                         } else {
2602                                 /* Keep dirs through this non-dir. */
2603                                 for (j = prev_depth; ; j--) {
2604                                         fp = flist->sorted[prev_i];
2605                                         if (F_DEPTH(fp) >= 0)
2606                                                 break;
2607                                         prev_i = -F_DEPTH(fp)-1;
2608                                         F_DEPTH(fp) = j;
2609                                 }
2610                         }
2611                 }
2612                 /* Dump all remaining empty dirs. */
2613                 while (1) {
2614                         struct file_struct *fp = flist->sorted[prev_i];
2615                         if (F_DEPTH(fp) >= 0)
2616                                 break;
2617                         prev_i = -F_DEPTH(fp)-1;
2618                         clear_file(fp);
2619                 }
2620
2621                 for (i = flist->low; i <= flist->high; i++) {
2622                         if (F_IS_ACTIVE(flist->sorted[i]))
2623                                 break;
2624                 }
2625                 flist->low = i;
2626                 for (i = flist->high; i >= flist->low; i--) {
2627                         if (F_IS_ACTIVE(flist->sorted[i]))
2628                                 break;
2629                 }
2630                 flist->high = i;
2631         }
2632 }
2633
2634 static void output_flist(struct file_list *flist)
2635 {
2636         char uidbuf[16], gidbuf[16], depthbuf[16];
2637         struct file_struct *file;
2638         const char *root, *dir, *slash, *name, *trail;
2639         const char *who = who_am_i();
2640         int i;
2641
2642         rprintf(FINFO, "[%s] flist start=%d, used=%d, low=%d, high=%d\n",
2643                 who, flist->ndx_start, flist->used, flist->low, flist->high);
2644         for (i = 0; i < flist->used; i++) {
2645                 file = flist->files[i];
2646                 if ((am_root || am_sender) && uid_ndx) {
2647                         snprintf(uidbuf, sizeof uidbuf, " uid=%u",
2648                                  F_OWNER(file));
2649                 } else
2650                         *uidbuf = '\0';
2651                 if (gid_ndx) {
2652                         static char parens[] = "(\0)\0\0\0";
2653                         char *pp = parens + (file->flags & FLAG_SKIP_GROUP ? 0 : 3);
2654                         snprintf(gidbuf, sizeof gidbuf, " gid=%s%u%s",
2655                                  pp, F_GROUP(file), pp + 2);
2656                 } else
2657                         *gidbuf = '\0';
2658                 if (!am_sender)
2659                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2660                 if (F_IS_ACTIVE(file)) {
2661                         root = am_sender ? NS(F_PATHNAME(file)) : depthbuf;
2662                         if ((dir = file->dirname) == NULL)
2663                                 dir = slash = "";
2664                         else
2665                                 slash = "/";
2666                         name = file->basename;
2667                         trail = S_ISDIR(file->mode) ? "/" : "";
2668                 } else
2669                         root = dir = slash = name = trail = "";
2670                 rprintf(FINFO,
2671                         "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
2672                         who, i + flist->ndx_start,
2673                         root, dir, slash, name, trail,
2674                         (int)file->mode, (double)F_LENGTH(file),
2675                         uidbuf, gidbuf, file->flags);
2676         }
2677 }
2678
2679 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2680 enum fnc_type { t_PATH, t_ITEM };
2681
2682 static int found_prefix;
2683
2684 /* Compare the names of two file_struct entities, similar to how strcmp()
2685  * would do if it were operating on the joined strings.
2686  *
2687  * Some differences beginning with protocol_version 29: (1) directory names
2688  * are compared with an assumed trailing slash so that they compare in a
2689  * way that would cause them to sort immediately prior to any content they
2690  * may have; (2) a directory of any name compares after a non-directory of
2691  * any name at the same depth; (3) a directory with name "." compares prior
2692  * to anything else.  These changes mean that a directory and a non-dir
2693  * with the same name will not compare as equal (protocol_version >= 29).
2694  *
2695  * The dirname component can be an empty string, but the basename component
2696  * cannot (and never is in the current codebase).  The basename component
2697  * may be NULL (for a removed item), in which case it is considered to be
2698  * after any existing item. */
2699 int f_name_cmp(const struct file_struct *f1, const struct file_struct *f2)
2700 {
2701         int dif;
2702         const uchar *c1, *c2;
2703         enum fnc_state state1, state2;
2704         enum fnc_type type1, type2;
2705         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
2706
2707         if (!f1 || !F_IS_ACTIVE(f1)) {
2708                 if (!f2 || !F_IS_ACTIVE(f2))
2709                         return 0;
2710                 return -1;
2711         }
2712         if (!f2 || !F_IS_ACTIVE(f2))
2713                 return 1;
2714
2715         c1 = (uchar*)f1->dirname;
2716         c2 = (uchar*)f2->dirname;
2717         if (c1 == c2)
2718                 c1 = c2 = NULL;
2719         if (!c1) {
2720                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2721                 c1 = (const uchar*)f1->basename;
2722                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2723                         type1 = t_ITEM;
2724                         state1 = s_TRAILING;
2725                         c1 = (uchar*)"";
2726                 } else
2727                         state1 = s_BASE;
2728         } else {
2729                 type1 = t_path;
2730                 state1 = s_DIR;
2731         }
2732         if (!c2) {
2733                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2734                 c2 = (const uchar*)f2->basename;
2735                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2736                         type2 = t_ITEM;
2737                         state2 = s_TRAILING;
2738                         c2 = (uchar*)"";
2739                 } else
2740                         state2 = s_BASE;
2741         } else {
2742                 type2 = t_path;
2743                 state2 = s_DIR;
2744         }
2745
2746         if (type1 != type2)
2747                 return type1 == t_PATH ? 1 : -1;
2748
2749         do {
2750                 if (!*c1) {
2751                         switch (state1) {
2752                         case s_DIR:
2753                                 state1 = s_SLASH;
2754                                 c1 = (uchar*)"/";
2755                                 break;
2756                         case s_SLASH:
2757                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2758                                 c1 = (const uchar*)f1->basename;
2759                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2760                                         type1 = t_ITEM;
2761                                         state1 = s_TRAILING;
2762                                         c1 = (uchar*)"";
2763                                 } else
2764                                         state1 = s_BASE;
2765                                 break;
2766                         case s_BASE:
2767                                 state1 = s_TRAILING;
2768                                 if (type1 == t_PATH) {
2769                                         c1 = (uchar*)"/";
2770                                         break;
2771                                 }
2772                                 /* FALL THROUGH */
2773                         case s_TRAILING:
2774                                 type1 = t_ITEM;
2775                                 break;
2776                         }
2777                         if (*c2 && type1 != type2)
2778                                 return type1 == t_PATH ? 1 : -1;
2779                 }
2780                 if (!*c2) {
2781                         switch (state2) {
2782                         case s_DIR:
2783                                 state2 = s_SLASH;
2784                                 c2 = (uchar*)"/";
2785                                 break;
2786                         case s_SLASH:
2787                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2788                                 c2 = (const uchar*)f2->basename;
2789                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2790                                         type2 = t_ITEM;
2791                                         state2 = s_TRAILING;
2792                                         c2 = (uchar*)"";
2793                                 } else
2794                                         state2 = s_BASE;
2795                                 break;
2796                         case s_BASE:
2797                                 state2 = s_TRAILING;
2798                                 if (type2 == t_PATH) {
2799                                         c2 = (uchar*)"/";
2800                                         break;
2801                                 }
2802                                 /* FALL THROUGH */
2803                         case s_TRAILING:
2804                                 found_prefix = 1;
2805                                 if (!*c1)
2806                                         return 0;
2807                                 type2 = t_ITEM;
2808                                 break;
2809                         }
2810                         if (type1 != type2)
2811                                 return type1 == t_PATH ? 1 : -1;
2812                 }
2813         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
2814
2815         return dif;
2816 }
2817
2818 /* Returns 1 if f1's filename has all of f2's filename as a prefix.  This does
2819  * not match if f2's basename is not an exact match of a path element in f1.
2820  * E.g. /path/foo is not a prefix of /path/foobar/baz, but /path/foobar is. */
2821 int f_name_has_prefix(const struct file_struct *f1, const struct file_struct *f2)
2822 {
2823         found_prefix = 0;
2824         f_name_cmp(f1, f2);
2825         return found_prefix;
2826 }
2827
2828 char *f_name_buf(void)
2829 {
2830         static char names[5][MAXPATHLEN];
2831         static unsigned int n;
2832
2833         n = (n + 1) % (sizeof names / sizeof names[0]);
2834
2835         return names[n];
2836 }
2837
2838 /* Return a copy of the full filename of a flist entry, using the indicated
2839  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
2840  * done because we checked the size when creating the file_struct entry.
2841  */
2842 char *f_name(const struct file_struct *f, char *fbuf)
2843 {
2844         if (!f || !F_IS_ACTIVE(f))
2845                 return NULL;
2846
2847         if (!fbuf)
2848                 fbuf = f_name_buf();
2849
2850         if (f->dirname) {
2851                 int len = strlen(f->dirname);
2852                 memcpy(fbuf, f->dirname, len);
2853                 fbuf[len] = '/';
2854                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
2855         } else
2856                 strlcpy(fbuf, f->basename, MAXPATHLEN);
2857
2858         return fbuf;
2859 }
2860
2861 /* Do a non-recursive scan of the named directory, possibly ignoring all
2862  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
2863  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
2864  * buffer (the functions we call will append names onto the end, but the old
2865  * dir value will be restored on exit). */
2866 struct file_list *get_dirlist(char *dirname, int dlen, int ignore_filter_rules)
2867 {
2868         struct file_list *dirlist;
2869         char dirbuf[MAXPATHLEN];
2870         int save_recurse = recurse;
2871         int save_xfer_dirs = xfer_dirs;
2872         int save_prune_empty_dirs = prune_empty_dirs;
2873
2874         if (dlen < 0) {
2875                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
2876                 if (dlen >= MAXPATHLEN)
2877                         return NULL;
2878                 dirname = dirbuf;
2879         }
2880
2881         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
2882
2883         recurse = 0;
2884         xfer_dirs = 1;
2885         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen, 0);
2886         xfer_dirs = save_xfer_dirs;
2887         recurse = save_recurse;
2888         if (do_progress)
2889                 flist_count_offset += dirlist->used;
2890
2891         prune_empty_dirs = 0;
2892         dirlist->sorted = dirlist->files;
2893         flist_sort_and_clean(dirlist, 0);
2894         prune_empty_dirs = save_prune_empty_dirs;
2895
2896         if (verbose > 3)
2897                 output_flist(dirlist);
2898
2899         return dirlist;
2900 }