flist.c

   1 /*
   2  * Generate and receive file lists.
   3  *
   4  * Copyright (C) 1996 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2002-2009 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, visit the http://fsf.org website.
  21  */
  22
  23 #include "rsync.h"
  24 #include "ifuncs.h"
  25 #include "rounding.h"
  26 #include "inums.h"
  27 #include "io.h"
  28
  29 extern int am_root;
  30 extern int am_server;
  31 extern int am_daemon;
  32 extern int am_sender;
  33 extern int am_generator;
  34 extern int inc_recurse;
  35 extern int always_checksum;
  36 extern int module_id;
  37 extern int ignore_errors;
  38 extern int numeric_ids;
  39 extern int recurse;
  40 extern int use_qsort;
  41 extern int xfer_dirs;
  42 extern int filesfrom_fd;
  43 extern int one_file_system;
  44 extern int copy_dirlinks;
  45 extern int preserve_uid;
  46 extern int preserve_gid;
  47 extern int preserve_acls;
  48 extern int preserve_xattrs;
  49 extern int preserve_links;
  50 extern int preserve_hard_links;
  51 extern int preserve_devices;
  52 extern int preserve_specials;
  53 extern int delete_during;
  54 extern int missing_args;
  55 extern int 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 use_safe_inc_flist;
  70 extern int need_unsorted_flist;
  71 extern int sender_symlink_iconv;
  72 extern int output_needs_newline;
  73 extern int sender_keeps_checksum;
  74 extern int unsort_ndx;
  75 extern struct stats stats;
  76 extern char *filesfrom_host;
  77 extern char *usermap, *groupmap;
  78
  79 extern char curr_dir[MAXPATHLEN];
  80
  81 extern struct chmod_mode_struct *chmod_modes;
  82
  83 extern filter_rule_list filter_list;
  84 extern filter_rule_list daemon_filter_list;
  85
  86 #ifdef ICONV_OPTION
  87 extern int filesfrom_convert;
  88 extern iconv_t ic_send, ic_recv;
  89 #endif
  90
  91 #ifdef HAVE_UTIMENSAT
  92 #ifdef HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
  93 #define ST_MTIME_NSEC st_mtim.tv_nsec
  94 #elif defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
  95 #define ST_MTIME_NSEC st_mtimensec
  96 #endif
  97 #endif
  98
  99 #define PTR_SIZE (sizeof (struct file_struct *))
 100
 101 int io_error;
 102 int checksum_len;
 103 dev_t filesystem_dev; /* used to implement -x */
 104
 105 struct file_list *cur_flist, *first_flist, *dir_flist;
 106 int send_dir_ndx = -1, send_dir_depth = -1;
 107 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
 108 int file_total = 0; /* total of all active items over all file-lists */
 109 int file_old_total = 0; /* total of active items that will soon be gone */
 110 int flist_eof = 0; /* all the file-lists are now known */
 111
 112 #define NORMAL_NAME 0
 113 #define SLASH_ENDING_NAME 1
 114 #define DOTDIR_NAME 2
 115
 116 /* Starting from protocol version 26, we always use 64-bit ino_t and dev_t
 117  * internally, even if this platform does not allow files to have 64-bit inums.
 118  * The only exception is if we're on a platform with no 64-bit type at all.
 119  *
 120  * Because we use read_longint() to get these off the wire, if you transfer
 121  * devices or (for protocols < 30) hardlinks with dev or inum > 2**32 to a
 122  * machine with no 64-bit types then you will get an overflow error.
 123  *
 124  * Note that if you transfer devices from a 64-bit-devt machine (say, Solaris)
 125  * to a 32-bit-devt machine (say, Linux-2.2/x86) then the device numbers will
 126  * be truncated.  But it's a kind of silly thing to do anyhow. */
 127
 128 /* The tmp_* vars are used as a cache area by make_file() to store data
 129  * that the sender doesn't need to remember in its file list.  The data
 130  * will survive just long enough to be used by send_file_entry(). */
 131 static dev_t tmp_rdev;
 132 #ifdef SUPPORT_HARD_LINKS
 133 static int64 tmp_dev = -1, tmp_ino;
 134 #endif
 135 static char tmp_sum[MAX_DIGEST_LEN];
 136
 137 static char empty_sum[MAX_DIGEST_LEN];
 138 static int flist_count_offset; /* for --delete --progress */
 139
 140 static void flist_sort_and_clean(struct file_list *flist, int strip_root);
 141 static void output_flist(struct file_list *flist);
 142
 143 void init_flist(void)
 144 {
 145         if (DEBUG_GTE(FLIST, 4)) {
 146                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
 147                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
 148         }
 149         checksum_len = protocol_version < 21 ? 2
 150                      : protocol_version < 30 ? MD4_DIGEST_LEN
 151                      : MD5_DIGEST_LEN;
 152 }
 153
 154 static int show_filelist_p(void)
 155 {
 156         return INFO_GTE(FLIST, 1) && xfer_dirs && !am_server && !inc_recurse;
 157 }
 158
 159 static void start_filelist_progress(char *kind)
 160 {
 161         rprintf(FCLIENT, "%s ... ", kind);
 162         output_needs_newline = 1;
 163         rflush(FINFO);
 164 }
 165
 166 static void emit_filelist_progress(int count)
 167 {
 168         rprintf(FCLIENT, " %d files...\r", count);
 169 }
 170
 171 static void maybe_emit_filelist_progress(int count)
 172 {
 173         if (INFO_GTE(FLIST, 2) && show_filelist_p() && (count % 100) == 0)
 174                 emit_filelist_progress(count);
 175 }
 176
 177 static void finish_filelist_progress(const struct file_list *flist)
 178 {
 179         if (INFO_GTE(FLIST, 2)) {
 180                 /* This overwrites the progress line */
 181                 rprintf(FINFO, "%d file%sto consider\n",
 182                         flist->used, flist->used == 1 ? " " : "s ");
 183         } else {
 184                 output_needs_newline = 0;
 185                 rprintf(FINFO, "done\n");
 186         }
 187 }
 188
 189 void show_flist_stats(void)
 190 {
 191         /* Nothing yet */
 192 }
 193
 194 /* Stat either a symlink or its referent, depending on the settings of
 195  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 196  *
 197  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 198  * MAXPATHLEN chars) will be set to the symlink's target string.
 199  *
 200  * The stat structure pointed to by stp will contain information about the
 201  * link or the referent as appropriate, if they exist. */
 202 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 203 {
 204 #ifdef SUPPORT_LINKS
 205         if (link_stat(path, stp, copy_dirlinks) < 0)
 206                 return -1;
 207         if (S_ISLNK(stp->st_mode)) {
 208                 int llen = do_readlink(path, linkbuf, MAXPATHLEN - 1);
 209                 if (llen < 0)
 210                         return -1;
 211                 linkbuf[llen] = '\0';
 212                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 213                         if (INFO_GTE(SYMSAFE, 1)) {
 214                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 215                                         path, linkbuf);
 216                         }
 217                         return x_stat(path, stp, NULL);
 218                 }
 219                 if (munge_symlinks && am_sender && llen > SYMLINK_PREFIX_LEN
 220                  && strncmp(linkbuf, SYMLINK_PREFIX, SYMLINK_PREFIX_LEN) == 0) {
 221                         memmove(linkbuf, linkbuf + SYMLINK_PREFIX_LEN,
 222                                 llen - SYMLINK_PREFIX_LEN + 1);
 223                 }
 224         }
 225         return 0;
 226 #else
 227         return x_stat(path, stp, NULL);
 228 #endif
 229 }
 230
 231 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 232 {
 233 #ifdef SUPPORT_LINKS
 234         if (copy_links)
 235                 return x_stat(path, stp, NULL);
 236         if (x_lstat(path, stp, NULL) < 0)
 237                 return -1;
 238         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 239                 STRUCT_STAT st;
 240                 if (x_stat(path, &st, NULL) == 0 && S_ISDIR(st.st_mode))
 241                         *stp = st;
 242         }
 243         return 0;
 244 #else
 245         return x_stat(path, stp, NULL);
 246 #endif
 247 }
 248
 249 static inline int is_daemon_excluded(const char *fname, int is_dir)
 250 {
 251         if (daemon_filter_list.head
 252          && check_filter(&daemon_filter_list, FLOG, fname, is_dir) < 0) {
 253                 errno = ENOENT;
 254                 return 1;
 255         }
 256         return 0;
 257 }
 258
 259 static inline int path_is_daemon_excluded(char *path, int ignore_filename)
 260 {
 261         if (daemon_filter_list.head) {
 262                 char *slash = path;
 263
 264                 while ((slash = strchr(slash+1, '/')) != NULL) {
 265                         int ret;
 266                         *slash = '\0';
 267                         ret = check_filter(&daemon_filter_list, FLOG, path, 1);
 268                         *slash = '/';
 269                         if (ret < 0) {
 270                                 errno = ENOENT;
 271                                 return 1;
 272                         }
 273                 }
 274
 275                 if (!ignore_filename
 276                  && check_filter(&daemon_filter_list, FLOG, path, 1) < 0) {
 277                         errno = ENOENT;
 278                         return 1;
 279                 }
 280         }
 281
 282         return 0;
 283 }
 284
 285 /* This function is used to check if a file should be included/excluded
 286  * from the list of files based on its name and type etc.  The value of
 287  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 288 static int is_excluded(const char *fname, int is_dir, int filter_level)
 289 {
 290 #if 0 /* This currently never happens, so avoid a useless compare. */
 291         if (filter_level == NO_FILTERS)
 292                 return 0;
 293 #endif
 294         if (is_daemon_excluded(fname, is_dir))
 295                 return 1;
 296         if (filter_level != ALL_FILTERS)
 297                 return 0;
 298         if (filter_list.head
 299             && check_filter(&filter_list, FINFO, fname, is_dir) < 0)
 300                 return 1;
 301         return 0;
 302 }
 303
 304 static void send_directory(int f, struct file_list *flist,
 305                            char *fbuf, int len, int flags);
 306
 307 static const char *pathname, *orig_dir;
 308 static int pathname_len;
 309
 310 /* Make sure flist can hold at least flist->used + extra entries. */
 311 static void flist_expand(struct file_list *flist, int extra)
 312 {
 313         struct file_struct **new_ptr;
 314
 315         if (flist->used + extra <= flist->malloced)
 316                 return;
 317
 318         if (flist->malloced < FLIST_START)
 319                 flist->malloced = FLIST_START;
 320         else if (flist->malloced >= FLIST_LINEAR)
 321                 flist->malloced += FLIST_LINEAR;
 322         else
 323                 flist->malloced *= 2;
 324
 325         /* In case count jumped or we are starting the list
 326          * with a known size just set it. */
 327         if (flist->malloced < flist->used + extra)
 328                 flist->malloced = flist->used + extra;
 329
 330         new_ptr = realloc_array(flist->files, struct file_struct *,
 331                                 flist->malloced);
 332
 333         if (DEBUG_GTE(FLIST, 1) && flist->malloced != FLIST_START) {
 334                 rprintf(FCLIENT, "[%s] expand file_list pointer array to %s bytes, did%s move\n",
 335                     who_am_i(),
 336                     big_num(sizeof flist->files[0] * flist->malloced),
 337                     (new_ptr == flist->files) ? " not" : "");
 338         }
 339
 340         flist->files = new_ptr;
 341
 342         if (!flist->files)
 343                 out_of_memory("flist_expand");
 344 }
 345
 346 static void flist_done_allocating(struct file_list *flist)
 347 {
 348         void *ptr = pool_boundary(flist->file_pool, 8*1024);
 349         if (flist->pool_boundary == ptr)
 350                 flist->pool_boundary = NULL; /* list didn't use any pool memory */
 351         else
 352                 flist->pool_boundary = ptr;
 353 }
 354
 355 /* Call this with EITHER (1) "file, NULL, 0" to chdir() to the file's
 356  * F_PATHNAME(), or (2) "NULL, dir, dirlen" to chdir() to the supplied dir,
 357  * with dir == NULL taken to be the starting directory, and dirlen < 0
 358  * indicating that strdup(dir) should be called and then the -dirlen length
 359  * value checked to ensure that it is not daemon-excluded. */
 360 int change_pathname(struct file_struct *file, const char *dir, int dirlen)
 361 {
 362         if (dirlen < 0) {
 363                 char *cpy = strdup(dir);
 364                 if (*cpy != '/')
 365                         change_dir(orig_dir, CD_SKIP_CHDIR);
 366                 if (path_is_daemon_excluded(cpy, 0))
 367                         goto chdir_error;
 368                 dir = cpy;
 369                 dirlen = -dirlen;
 370         } else {
 371                 if (file) {
 372                         if (pathname == F_PATHNAME(file))
 373                                 return 1;
 374                         dir = F_PATHNAME(file);
 375                         if (dir)
 376                                 dirlen = strlen(dir);
 377                 } else if (pathname == dir)
 378                         return 1;
 379                 if (dir && *dir != '/')
 380                         change_dir(orig_dir, CD_SKIP_CHDIR);
 381         }
 382
 383         pathname = dir;
 384         pathname_len = dirlen;
 385
 386         if (!dir)
 387                 dir = orig_dir;
 388
 389         if (!change_dir(dir, CD_NORMAL)) {
 390           chdir_error:
 391                 io_error |= IOERR_GENERAL;
 392                 rsyserr(FERROR_XFER, errno, "change_dir %s failed", full_fname(dir));
 393                 if (dir != orig_dir)
 394                         change_dir(orig_dir, CD_NORMAL);
 395                 pathname = NULL;
 396                 pathname_len = 0;
 397                 return 0;
 398         }
 399
 400         return 1;
 401 }
 402
 403 static void send_file_entry(int f, const char *fname, struct file_struct *file,
 404 #ifdef SUPPORT_LINKS
 405                             const char *symlink_name, int symlink_len,
 406 #endif
 407                             int ndx, int first_ndx)
 408 {
 409         static time_t modtime;
 410         static mode_t mode;
 411 #ifdef SUPPORT_HARD_LINKS
 412         static int64 dev;
 413 #endif
 414         static dev_t rdev;
 415         static uint32 rdev_major;
 416         static uid_t uid;
 417         static gid_t gid;
 418         static const char *user_name, *group_name;
 419         static char lastname[MAXPATHLEN];
 420 #ifdef SUPPORT_HARD_LINKS
 421         int first_hlink_ndx = -1;
 422 #endif
 423         int l1, l2;
 424         int xflags;
 425
 426         /* Initialize starting value of xflags and adjust counts. */
 427         if (S_ISREG(file->mode))
 428                 xflags = 0;
 429         else if (S_ISDIR(file->mode)) {
 430                 stats.num_dirs++;
 431                 if (protocol_version >= 30) {
 432                         if (file->flags & FLAG_CONTENT_DIR)
 433                                 xflags = file->flags & FLAG_TOP_DIR;
 434                         else if (file->flags & FLAG_IMPLIED_DIR)
 435                                 xflags = XMIT_TOP_DIR | XMIT_NO_CONTENT_DIR;
 436                         else
 437                                 xflags = XMIT_NO_CONTENT_DIR;
 438                 } else
 439                         xflags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 440         } else {
 441                 if (S_ISLNK(file->mode))
 442                         stats.num_symlinks++;
 443                 else if (IS_DEVICE(file->mode))
 444                         stats.num_devices++;
 445                 else if (IS_SPECIAL(file->mode))
 446                         stats.num_specials++;
 447                 xflags = 0;
 448         }
 449
 450         if (file->mode == mode)
 451                 xflags |= XMIT_SAME_MODE;
 452         else
 453                 mode = file->mode;
 454
 455         if (preserve_devices && IS_DEVICE(mode)) {
 456                 if (protocol_version < 28) {
 457                         if (tmp_rdev == rdev)
 458                                 xflags |= XMIT_SAME_RDEV_pre28;
 459                         else
 460                                 rdev = tmp_rdev;
 461                 } else {
 462                         rdev = tmp_rdev;
 463                         if ((uint32)major(rdev) == rdev_major)
 464                                 xflags |= XMIT_SAME_RDEV_MAJOR;
 465                         else
 466                                 rdev_major = major(rdev);
 467                         if (protocol_version < 30 && (uint32)minor(rdev) <= 0xFFu)
 468                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
 469                 }
 470         } else if (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31) {
 471                 /* Special files don't need an rdev number, so just make
 472                  * the historical transmission of the value efficient. */
 473                 if (protocol_version < 28)
 474                         xflags |= XMIT_SAME_RDEV_pre28;
 475                 else {
 476                         rdev = MAKEDEV(major(rdev), 0);
 477                         xflags |= XMIT_SAME_RDEV_MAJOR;
 478                         if (protocol_version < 30)
 479                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
 480                 }
 481         } else if (protocol_version < 28)
 482                 rdev = MAKEDEV(0, 0);
 483         if (!preserve_uid || ((uid_t)F_OWNER(file) == uid && *lastname))
 484                 xflags |= XMIT_SAME_UID;
 485         else {
 486                 uid = F_OWNER(file);
 487                 if (!numeric_ids) {
 488                         user_name = add_uid(uid);
 489                         if (inc_recurse && user_name)
 490                                 xflags |= XMIT_USER_NAME_FOLLOWS;
 491                 }
 492         }
 493         if (!preserve_gid || ((gid_t)F_GROUP(file) == gid && *lastname))
 494                 xflags |= XMIT_SAME_GID;
 495         else {
 496                 gid = F_GROUP(file);
 497                 if (!numeric_ids) {
 498                         group_name = add_gid(gid);
 499                         if (inc_recurse && group_name)
 500                                 xflags |= XMIT_GROUP_NAME_FOLLOWS;
 501                 }
 502         }
 503         if (file->modtime == modtime)
 504                 xflags |= XMIT_SAME_TIME;
 505         else
 506                 modtime = file->modtime;
 507         if (NSEC_BUMP(file) && protocol_version >= 31)
 508                 xflags |= XMIT_MOD_NSEC;
 509
 510 #ifdef SUPPORT_HARD_LINKS
 511         if (tmp_dev != -1) {
 512                 if (protocol_version >= 30) {
 513                         struct ht_int64_node *np = idev_find(tmp_dev, tmp_ino);
 514                         first_hlink_ndx = (int32)(long)np->data - 1;
 515                         if (first_hlink_ndx < 0) {
 516                                 np->data = (void*)(long)(first_ndx + ndx + 1);
 517                                 xflags |= XMIT_HLINK_FIRST;
 518                         }
 519                         if (DEBUG_GTE(HLINK, 1)) {
 520                                 if (first_hlink_ndx >= 0) {
 521                                         rprintf(FINFO, "[%s] #%d hard-links #%d (%sabbrev)\n",
 522                                                 who_am_i(), first_ndx + ndx, first_hlink_ndx,
 523                                                 first_hlink_ndx >= first_ndx ? "" : "un");
 524                                 } else if (DEBUG_GTE(HLINK, 3)) {
 525                                         rprintf(FINFO, "[%s] dev:inode for #%d is %s:%s\n",
 526                                                 who_am_i(), first_ndx + ndx,
 527                                                 big_num(tmp_dev), big_num(tmp_ino));
 528                                 }
 529                         }
 530                 } else {
 531                         if (tmp_dev == dev) {
 532                                 if (protocol_version >= 28)
 533                                         xflags |= XMIT_SAME_DEV_pre30;
 534                         } else
 535                                 dev = tmp_dev;
 536                 }
 537                 xflags |= XMIT_HLINKED;
 538         }
 539 #endif
 540
 541         for (l1 = 0;
 542             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 543             l1++) {}
 544         l2 = strlen(fname+l1);
 545
 546         if (l1 > 0)
 547                 xflags |= XMIT_SAME_NAME;
 548         if (l2 > 255)
 549                 xflags |= XMIT_LONG_NAME;
 550
 551         /* We must make sure we don't send a zero flag byte or the
 552          * other end will terminate the flist transfer.  Note that
 553          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 554          * it's harmless way to add a bit to the first flag byte. */
 555         if (protocol_version >= 28) {
 556                 if (!xflags && !S_ISDIR(mode))
 557                         xflags |= XMIT_TOP_DIR;
 558                 if ((xflags & 0xFF00) || !xflags) {
 559                         xflags |= XMIT_EXTENDED_FLAGS;
 560                         write_shortint(f, xflags);
 561                 } else
 562                         write_byte(f, xflags);
 563         } else {
 564                 if (!(xflags & 0xFF))
 565                         xflags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 566                 write_byte(f, xflags);
 567         }
 568         if (xflags & XMIT_SAME_NAME)
 569                 write_byte(f, l1);
 570         if (xflags & XMIT_LONG_NAME)
 571                 write_varint30(f, l2);
 572         else
 573                 write_byte(f, l2);
 574         write_buf(f, fname + l1, l2);
 575
 576 #ifdef SUPPORT_HARD_LINKS
 577         if (first_hlink_ndx >= 0) {
 578                 write_varint(f, first_hlink_ndx);
 579                 if (first_hlink_ndx >= first_ndx)
 580                         goto the_end;
 581         }
 582 #endif
 583
 584         write_varlong30(f, F_LENGTH(file), 3);
 585         if (!(xflags & XMIT_SAME_TIME)) {
 586                 if (protocol_version >= 30)
 587                         write_varlong(f, modtime, 4);
 588                 else
 589                         write_int(f, modtime);
 590         }
 591         if (xflags & XMIT_MOD_NSEC)
 592                 write_varint(f, F_MOD_NSEC(file));
 593         if (!(xflags & XMIT_SAME_MODE))
 594                 write_int(f, to_wire_mode(mode));
 595         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
 596                 if (protocol_version < 30)
 597                         write_int(f, uid);
 598                 else {
 599                         write_varint(f, uid);
 600                         if (xflags & XMIT_USER_NAME_FOLLOWS) {
 601                                 int len = strlen(user_name);
 602                                 write_byte(f, len);
 603                                 write_buf(f, user_name, len);
 604                         }
 605                 }
 606         }
 607         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
 608                 if (protocol_version < 30)
 609                         write_int(f, gid);
 610                 else {
 611                         write_varint(f, gid);
 612                         if (xflags & XMIT_GROUP_NAME_FOLLOWS) {
 613                                 int len = strlen(group_name);
 614                                 write_byte(f, len);
 615                                 write_buf(f, group_name, len);
 616                         }
 617                 }
 618         }
 619         if ((preserve_devices && IS_DEVICE(mode))
 620          || (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31)) {
 621                 if (protocol_version < 28) {
 622                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 623                                 write_int(f, (int)rdev);
 624                 } else {
 625                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 626                                 write_varint30(f, major(rdev));
 627                         if (protocol_version >= 30)
 628                                 write_varint(f, minor(rdev));
 629                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 630                                 write_byte(f, minor(rdev));
 631                         else
 632                                 write_int(f, minor(rdev));
 633                 }
 634         }
 635
 636 #ifdef SUPPORT_LINKS
 637         if (symlink_len) {
 638                 write_varint30(f, symlink_len);
 639                 write_buf(f, symlink_name, symlink_len);
 640         }
 641 #endif
 642
 643 #ifdef SUPPORT_HARD_LINKS
 644         if (tmp_dev != -1 && protocol_version < 30) {
 645                 /* Older protocols expect the dev number to be transmitted
 646                  * 1-incremented so that it is never zero. */
 647                 if (protocol_version < 26) {
 648                         /* 32-bit dev_t and ino_t */
 649                         write_int(f, (int32)(dev+1));
 650                         write_int(f, (int32)tmp_ino);
 651                 } else {
 652                         /* 64-bit dev_t and ino_t */
 653                         if (!(xflags & XMIT_SAME_DEV_pre30))
 654                                 write_longint(f, dev+1);
 655                         write_longint(f, tmp_ino);
 656                 }
 657         }
 658 #endif
 659
 660         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 661                 const char *sum;
 662                 if (S_ISREG(mode))
 663                         sum = tmp_sum;
 664                 else {
 665                         /* Prior to 28, we sent a useless set of nulls. */
 666                         sum = empty_sum;
 667                 }
 668                 write_buf(f, sum, checksum_len);
 669         }
 670
 671 #ifdef SUPPORT_HARD_LINKS
 672   the_end:
 673 #endif
 674         strlcpy(lastname, fname, MAXPATHLEN);
 675
 676         if (S_ISREG(mode) || S_ISLNK(mode))
 677                 stats.total_size += F_LENGTH(file);
 678 }
 679
 680 static struct file_struct *recv_file_entry(int f, struct file_list *flist, int xflags)
 681 {
 682         static int64 modtime;
 683         static mode_t mode;
 684 #ifdef SUPPORT_HARD_LINKS
 685         static int64 dev;
 686 #endif
 687         static dev_t rdev;
 688         static uint32 rdev_major;
 689         static uid_t uid;
 690         static gid_t gid;
 691         static uint16 gid_flags;
 692         static char lastname[MAXPATHLEN], *lastdir;
 693         static int lastdir_depth, lastdir_len = -1;
 694         static unsigned int del_hier_name_len = 0;
 695         static int in_del_hier = 0;
 696         char thisname[MAXPATHLEN];
 697         unsigned int l1 = 0, l2 = 0;
 698         int alloc_len, basename_len, linkname_len;
 699         int extra_len = file_extra_cnt * EXTRA_LEN;
 700         int first_hlink_ndx = -1;
 701         int64 file_length;
 702         uint32 modtime_nsec;
 703         const char *basename;
 704         struct file_struct *file;
 705         alloc_pool_t *pool;
 706         char *bp;
 707
 708         if (xflags & XMIT_SAME_NAME)
 709                 l1 = read_byte(f);
 710
 711         if (xflags & XMIT_LONG_NAME)
 712                 l2 = read_varint30(f);
 713         else
 714                 l2 = read_byte(f);
 715
 716         if (l2 >= MAXPATHLEN - l1) {
 717                 rprintf(FERROR,
 718                         "overflow: xflags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 719                         xflags, l1, l2, lastname, who_am_i());
 720                 overflow_exit("recv_file_entry");
 721         }
 722
 723         strlcpy(thisname, lastname, l1 + 1);
 724         read_sbuf(f, &thisname[l1], l2);
 725         thisname[l1 + l2] = 0;
 726
 727         /* Abuse basename_len for a moment... */
 728         basename_len = strlcpy(lastname, thisname, MAXPATHLEN);
 729
 730 #ifdef ICONV_OPTION
 731         if (ic_recv != (iconv_t)-1) {
 732                 xbuf outbuf, inbuf;
 733
 734                 INIT_CONST_XBUF(outbuf, thisname);
 735                 INIT_XBUF(inbuf, lastname, basename_len, (size_t)-1);
 736
 737                 if (iconvbufs(ic_recv, &inbuf, &outbuf, ICB_INIT) < 0) {
 738                         io_error |= IOERR_GENERAL;
 739                         rprintf(FERROR_UTF8,
 740                             "[%s] cannot convert filename: %s (%s)\n",
 741                             who_am_i(), lastname, strerror(errno));
 742                         outbuf.len = 0;
 743                 }
 744                 thisname[outbuf.len] = '\0';
 745         }
 746 #endif
 747
 748         if (*thisname)
 749                 clean_fname(thisname, 0);
 750
 751         if (sanitize_paths)
 752                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
 753
 754         if ((basename = strrchr(thisname, '/')) != NULL) {
 755                 int len = basename++ - thisname;
 756                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 757                         lastdir = new_array(char, len + 1);
 758                         memcpy(lastdir, thisname, len);
 759                         lastdir[len] = '\0';
 760                         lastdir_len = len;
 761                         lastdir_depth = count_dir_elements(lastdir);
 762                 }
 763         } else
 764                 basename = thisname;
 765         basename_len = strlen(basename) + 1; /* count the '\0' */
 766
 767 #ifdef SUPPORT_HARD_LINKS
 768         if (protocol_version >= 30
 769          && BITS_SETnUNSET(xflags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 770                 first_hlink_ndx = read_varint(f);
 771                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->ndx_start + flist->used) {
 772                         rprintf(FERROR,
 773                                 "hard-link reference out of range: %d (%d)\n",
 774                                 first_hlink_ndx, flist->ndx_start + flist->used);
 775                         exit_cleanup(RERR_PROTOCOL);
 776                 }
 777                 if (DEBUG_GTE(HLINK, 1)) {
 778                         rprintf(FINFO, "[%s] #%d hard-links #%d (%sabbrev)\n",
 779                                 who_am_i(), flist->used+flist->ndx_start, first_hlink_ndx,
 780                                 first_hlink_ndx >= flist->ndx_start ? "" : "un");
 781                 }
 782                 if (first_hlink_ndx >= flist->ndx_start) {
 783                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
 784                         file_length = F_LENGTH(first);
 785                         modtime = first->modtime;
 786                         modtime_nsec = F_MOD_NSEC(first);
 787                         mode = first->mode;
 788                         if (preserve_uid)
 789                                 uid = F_OWNER(first);
 790                         if (preserve_gid)
 791                                 gid = F_GROUP(first);
 792                         if (preserve_devices && IS_DEVICE(mode)) {
 793                                 uint32 *devp = F_RDEV_P(first);
 794                                 rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 795                                 extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 796                         }
 797                         if (preserve_links && S_ISLNK(mode))
 798                                 linkname_len = strlen(F_SYMLINK(first)) + 1;
 799                         else
 800                                 linkname_len = 0;
 801                         goto create_object;
 802                 }
 803         }
 804 #endif
 805
 806         file_length = read_varlong30(f, 3);
 807         if (!(xflags & XMIT_SAME_TIME)) {
 808                 if (protocol_version >= 30) {
 809                         modtime = read_varlong(f, 4);
 810 #if SIZEOF_TIME_T < SIZEOF_INT64
 811                         if (!am_generator && (int64)(time_t)modtime != modtime) {
 812                                 rprintf(FERROR_XFER,
 813                                     "Time value of %s truncated on receiver.\n",
 814                                     lastname);
 815                         }
 816 #endif
 817                 } else
 818                         modtime = read_int(f);
 819         }
 820         if (xflags & XMIT_MOD_NSEC)
 821                 modtime_nsec = read_varint(f);
 822         else
 823                 modtime_nsec = 0;
 824         if (!(xflags & XMIT_SAME_MODE))
 825                 mode = from_wire_mode(read_int(f));
 826
 827         if (chmod_modes && !S_ISLNK(mode) && mode)
 828                 mode = tweak_mode(mode, chmod_modes);
 829
 830         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
 831                 if (protocol_version < 30)
 832                         uid = (uid_t)read_int(f);
 833                 else {
 834                         uid = (uid_t)read_varint(f);
 835                         if (xflags & XMIT_USER_NAME_FOLLOWS)
 836                                 uid = recv_user_name(f, uid);
 837                         else if (inc_recurse && am_root && (!numeric_ids || usermap))
 838                                 uid = match_uid(uid);
 839                 }
 840         }
 841         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
 842                 if (protocol_version < 30)
 843                         gid = (gid_t)read_int(f);
 844                 else {
 845                         gid = (gid_t)read_varint(f);
 846                         gid_flags = 0;
 847                         if (xflags & XMIT_GROUP_NAME_FOLLOWS)
 848                                 gid = recv_group_name(f, gid, &gid_flags);
 849                         else if (inc_recurse && (!am_root || !numeric_ids || groupmap))
 850                                 gid = match_gid(gid, &gid_flags);
 851                 }
 852         }
 853
 854         if ((preserve_devices && IS_DEVICE(mode))
 855          || (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31)) {
 856                 if (protocol_version < 28) {
 857                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 858                                 rdev = (dev_t)read_int(f);
 859                 } else {
 860                         uint32 rdev_minor;
 861                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 862                                 rdev_major = read_varint30(f);
 863                         if (protocol_version >= 30)
 864                                 rdev_minor = read_varint(f);
 865                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 866                                 rdev_minor = read_byte(f);
 867                         else
 868                                 rdev_minor = read_int(f);
 869                         rdev = MAKEDEV(rdev_major, rdev_minor);
 870                 }
 871                 if (IS_DEVICE(mode))
 872                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 873                 file_length = 0;
 874         } else if (protocol_version < 28)
 875                 rdev = MAKEDEV(0, 0);
 876
 877 #ifdef SUPPORT_LINKS
 878         if (preserve_links && S_ISLNK(mode)) {
 879                 linkname_len = read_varint30(f) + 1; /* count the '\0' */
 880                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 881                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 882                                 linkname_len - 1);
 883                         overflow_exit("recv_file_entry");
 884                 }
 885 #ifdef ICONV_OPTION
 886                 /* We don't know how much extra room we need to convert
 887                  * the as-yet-unread symlink data, so let's hope that a
 888                  * double-size buffer is plenty. */
 889                 if (sender_symlink_iconv)
 890                         linkname_len *= 2;
 891 #endif
 892                 if (munge_symlinks)
 893                         linkname_len += SYMLINK_PREFIX_LEN;
 894         }
 895         else
 896 #endif
 897                 linkname_len = 0;
 898
 899 #ifdef SUPPORT_HARD_LINKS
 900   create_object:
 901         if (preserve_hard_links) {
 902                 if (protocol_version < 28 && S_ISREG(mode))
 903                         xflags |= XMIT_HLINKED;
 904                 if (xflags & XMIT_HLINKED)
 905                         extra_len += (inc_recurse+1) * EXTRA_LEN;
 906         }
 907 #endif
 908
 909 #ifdef SUPPORT_ACLS
 910         /* Directories need an extra int32 for the default ACL. */
 911         if (preserve_acls && S_ISDIR(mode))
 912                 extra_len += EXTRA_LEN;
 913 #endif
 914
 915         if (always_checksum && S_ISREG(mode))
 916                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 917
 918 #if SIZEOF_INT64 >= 8
 919         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 920                 extra_len += EXTRA_LEN;
 921 #endif
 922 #ifdef HAVE_UTIMENSAT
 923         if (modtime_nsec)
 924                 extra_len += EXTRA_LEN;
 925 #endif
 926         if (file_length < 0) {
 927                 rprintf(FERROR, "Offset underflow: file-length is negative\n");
 928                 exit_cleanup(RERR_UNSUPPORTED);
 929         }
 930
 931         if (inc_recurse && S_ISDIR(mode)) {
 932                 if (one_file_system) {
 933                         /* Room to save the dir's device for -x */
 934                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 935                 }
 936                 pool = dir_flist->file_pool;
 937         } else
 938                 pool = flist->file_pool;
 939
 940 #if EXTRA_ROUNDING > 0
 941         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 942                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 943 #endif
 944
 945         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 946                   + linkname_len;
 947         bp = pool_alloc(pool, alloc_len, "recv_file_entry");
 948
 949         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 950         bp += extra_len;
 951         file = (struct file_struct *)bp;
 952         bp += FILE_STRUCT_LEN;
 953
 954         memcpy(bp, basename, basename_len);
 955
 956 #ifdef SUPPORT_HARD_LINKS
 957         if (xflags & XMIT_HLINKED)
 958                 file->flags |= FLAG_HLINKED;
 959 #endif
 960         file->modtime = (time_t)modtime;
 961 #ifdef HAVE_UTIMENSAT
 962         if (modtime_nsec) {
 963                 file->flags |= FLAG_MOD_NSEC;
 964                 OPT_EXTRA(file, 0)->unum = modtime_nsec;
 965         }
 966 #endif
 967         file->len32 = (uint32)file_length;
 968 #if SIZEOF_INT64 >= 8
 969         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 970 #if SIZEOF_CAPITAL_OFF_T < 8
 971                 rprintf(FERROR, "Offset overflow: attempted 64-bit file-length\n");
 972                 exit_cleanup(RERR_UNSUPPORTED);
 973 #else
 974                 file->flags |= FLAG_LENGTH64;
 975                 OPT_EXTRA(file, NSEC_BUMP(file))->unum = (uint32)(file_length >> 32);
 976 #endif
 977         }
 978 #endif
 979         file->mode = mode;
 980         if (preserve_uid)
 981                 F_OWNER(file) = uid;
 982         if (preserve_gid) {
 983                 F_GROUP(file) = gid;
 984                 file->flags |= gid_flags;
 985         }
 986         if (unsort_ndx)
 987                 F_NDX(file) = flist->used + flist->ndx_start;
 988
 989         if (basename != thisname) {
 990                 file->dirname = lastdir;
 991                 F_DEPTH(file) = lastdir_depth + 1;
 992         } else
 993                 F_DEPTH(file) = 1;
 994
 995         if (S_ISDIR(mode)) {
 996                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 997                         F_DEPTH(file)--;
 998                 if (protocol_version >= 30) {
 999                         if (!(xflags & XMIT_NO_CONTENT_DIR)) {
1000                                 if (xflags & XMIT_TOP_DIR)
1001                                         file->flags |= FLAG_TOP_DIR;
1002                                 file->flags |= FLAG_CONTENT_DIR;
1003                         } else if (xflags & XMIT_TOP_DIR)
1004                                 file->flags |= FLAG_IMPLIED_DIR;
1005                 } else if (xflags & XMIT_TOP_DIR) {
1006                         in_del_hier = recurse;
1007                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
1008                         if (relative_paths && del_hier_name_len > 2
1009                             && lastname[del_hier_name_len-1] == '.'
1010                             && lastname[del_hier_name_len-2] == '/')
1011                                 del_hier_name_len -= 2;
1012                         file->flags |= FLAG_TOP_DIR | FLAG_CONTENT_DIR;
1013                 } else if (in_del_hier) {
1014                         if (!relative_paths || !del_hier_name_len
1015                          || (l1 >= del_hier_name_len
1016                           && lastname[del_hier_name_len] == '/'))
1017                                 file->flags |= FLAG_CONTENT_DIR;
1018                         else
1019                                 in_del_hier = 0;
1020                 }
1021         }
1022
1023         if (preserve_devices && IS_DEVICE(mode)) {
1024                 uint32 *devp = F_RDEV_P(file);
1025                 DEV_MAJOR(devp) = major(rdev);
1026                 DEV_MINOR(devp) = minor(rdev);
1027         }
1028
1029 #ifdef SUPPORT_LINKS
1030         if (linkname_len) {
1031                 bp += basename_len;
1032                 if (first_hlink_ndx >= flist->ndx_start) {
1033                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
1034                         memcpy(bp, F_SYMLINK(first), linkname_len);
1035                 } else {
1036                         if (munge_symlinks) {
1037                                 strlcpy(bp, SYMLINK_PREFIX, linkname_len);
1038                                 bp += SYMLINK_PREFIX_LEN;
1039                                 linkname_len -= SYMLINK_PREFIX_LEN;
1040                         }
1041 #ifdef ICONV_OPTION
1042                         if (sender_symlink_iconv) {
1043                                 xbuf outbuf, inbuf;
1044
1045                                 alloc_len = linkname_len;
1046                                 linkname_len /= 2;
1047
1048                                 /* Read the symlink data into the end of our double-sized
1049                                  * buffer and then convert it into the right spot. */
1050                                 INIT_XBUF(inbuf, bp + alloc_len - linkname_len,
1051                                           linkname_len - 1, (size_t)-1);
1052                                 read_sbuf(f, inbuf.buf, inbuf.len);
1053                                 INIT_XBUF(outbuf, bp, 0, alloc_len);
1054
1055                                 if (iconvbufs(ic_recv, &inbuf, &outbuf, ICB_INIT) < 0) {
1056                                         io_error |= IOERR_GENERAL;
1057                                         rprintf(FERROR_XFER,
1058                                             "[%s] cannot convert symlink data for: %s (%s)\n",
1059                                             who_am_i(), full_fname(thisname), strerror(errno));
1060                                         bp = (char*)file->basename;
1061                                         *bp++ = '\0';
1062                                         outbuf.len = 0;
1063                                 }
1064                                 bp[outbuf.len] = '\0';
1065                         } else
1066 #endif
1067                                 read_sbuf(f, bp, linkname_len - 1);
1068                         if (sanitize_paths && !munge_symlinks && *bp)
1069                                 sanitize_path(bp, bp, "", lastdir_depth, SP_DEFAULT);
1070                 }
1071         }
1072 #endif
1073
1074 #ifdef SUPPORT_HARD_LINKS
1075         if (preserve_hard_links && xflags & XMIT_HLINKED) {
1076                 if (protocol_version >= 30) {
1077                         if (xflags & XMIT_HLINK_FIRST) {
1078                                 F_HL_GNUM(file) = flist->ndx_start + flist->used;
1079                         } else
1080                                 F_HL_GNUM(file) = first_hlink_ndx;
1081                 } else {
1082                         static int32 cnt = 0;
1083                         struct ht_int64_node *np;
1084                         int64 ino;
1085                         int32 ndx;
1086                         if (protocol_version < 26) {
1087                                 dev = read_int(f);
1088                                 ino = read_int(f);
1089                         } else {
1090                                 if (!(xflags & XMIT_SAME_DEV_pre30))
1091                                         dev = read_longint(f);
1092                                 ino = read_longint(f);
1093                         }
1094                         np = idev_find(dev, ino);
1095                         ndx = (int32)(long)np->data - 1;
1096                         if (ndx < 0) {
1097                                 ndx = cnt++;
1098                                 np->data = (void*)(long)cnt;
1099                         }
1100                         F_HL_GNUM(file) = ndx;
1101                 }
1102         }
1103 #endif
1104
1105         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
1106                 if (S_ISREG(mode))
1107                         bp = F_SUM(file);
1108                 else {
1109                         /* Prior to 28, we get a useless set of nulls. */
1110                         bp = tmp_sum;
1111                 }
1112                 if (first_hlink_ndx >= flist->ndx_start) {
1113                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
1114                         memcpy(bp, F_SUM(first), checksum_len);
1115                 } else
1116                         read_buf(f, bp, checksum_len);
1117         }
1118
1119 #ifdef SUPPORT_ACLS
1120         if (preserve_acls && !S_ISLNK(mode))
1121                 receive_acl(f, file);
1122 #endif
1123 #ifdef SUPPORT_XATTRS
1124         if (preserve_xattrs)
1125                 receive_xattr(f, file);
1126 #endif
1127
1128         if (S_ISREG(mode) || S_ISLNK(mode))
1129                 stats.total_size += file_length;
1130
1131         return file;
1132 }
1133
1134 /* Create a file_struct for a named file by reading its stat() information
1135  * and performing extensive checks against global options.
1136  *
1137  * Returns a pointer to the new file struct, or NULL if there was an error
1138  * or this file should be excluded.
1139  *
1140  * Note: Any error (here or in send_file_name) that results in the omission of
1141  * an existent source file from the file list should set
1142  * "io_error |= IOERR_GENERAL" to avoid deletion of the file from the
1143  * destination if --delete is on. */
1144 struct file_struct *make_file(const char *fname, struct file_list *flist,
1145                               STRUCT_STAT *stp, int flags, int filter_level)
1146 {
1147         static char *lastdir;
1148         static int lastdir_len = -1;
1149         struct file_struct *file;
1150         char thisname[MAXPATHLEN];
1151         char linkname[MAXPATHLEN];
1152         int alloc_len, basename_len, linkname_len;
1153         int extra_len = file_extra_cnt * EXTRA_LEN;
1154         const char *basename;
1155         alloc_pool_t *pool;
1156         STRUCT_STAT st;
1157         char *bp;
1158
1159         if (strlcpy(thisname, fname, sizeof thisname) >= sizeof thisname) {
1160                 io_error |= IOERR_GENERAL;
1161                 rprintf(FERROR_XFER, "skipping overly long name: %s\n", fname);
1162                 return NULL;
1163         }
1164         clean_fname(thisname, 0);
1165         if (sanitize_paths)
1166                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
1167
1168         if (stp && (S_ISDIR(stp->st_mode) || stp->st_mode == 0)) {
1169                 /* This is needed to handle a "symlink/." with a --relative
1170                  * dir, or a request to delete a specific file. */
1171                 st = *stp;
1172                 *linkname = '\0'; /* make IBM code checker happy */
1173         } else if (readlink_stat(thisname, &st, linkname) != 0) {
1174                 int save_errno = errno;
1175                 /* See if file is excluded before reporting an error. */
1176                 if (filter_level != NO_FILTERS
1177                  && (is_excluded(thisname, 0, filter_level)
1178                   || is_excluded(thisname, 1, filter_level))) {
1179                         if (ignore_perishable && save_errno != ENOENT)
1180                                 non_perishable_cnt++;
1181                         return NULL;
1182                 }
1183                 if (save_errno == ENOENT) {
1184 #ifdef SUPPORT_LINKS
1185                         /* When our options tell us to follow a symlink that
1186                          * points nowhere, tell the user about the symlink
1187                          * instead of giving a "vanished" message.  We only
1188                          * dereference a symlink if one of the --copy*links
1189                          * options was specified, so there's no need for the
1190                          * extra lstat() if one of these options isn't on. */
1191                         if ((copy_links || copy_unsafe_links || copy_dirlinks)
1192                          && x_lstat(thisname, &st, NULL) == 0
1193                          && S_ISLNK(st.st_mode)) {
1194                                 io_error |= IOERR_GENERAL;
1195                                 rprintf(FERROR_XFER, "symlink has no referent: %s\n",
1196                                         full_fname(thisname));
1197                         } else
1198 #endif
1199                         {
1200                                 enum logcode c = am_daemon && protocol_version < 28
1201                                                ? FERROR : FWARNING;
1202                                 io_error |= IOERR_VANISHED;
1203                                 rprintf(c, "file has vanished: %s\n",
1204                                         full_fname(thisname));
1205                         }
1206                 } else {
1207                         io_error |= IOERR_GENERAL;
1208                         rsyserr(FERROR_XFER, save_errno, "readlink_stat(%s) failed",
1209                                 full_fname(thisname));
1210                 }
1211                 return NULL;
1212         } else if (st.st_mode == 0) {
1213                 io_error |= IOERR_GENERAL;
1214                 rprintf(FINFO, "skipping file with bogus (zero) st_mode: %s\n",
1215                         full_fname(thisname));
1216                 return NULL;
1217         }
1218
1219         if (filter_level == NO_FILTERS)
1220                 goto skip_filters;
1221
1222         if (S_ISDIR(st.st_mode)) {
1223                 if (!xfer_dirs) {
1224                         rprintf(FINFO, "skipping directory %s\n", thisname);
1225                         return NULL;
1226                 }
1227                 /* -x only affects dirs because we need to avoid recursing
1228                  * into a mount-point directory, not to avoid copying a
1229                  * symlinked file if -L (or similar) was specified. */
1230                 if (one_file_system && st.st_dev != filesystem_dev
1231                  && BITS_SETnUNSET(flags, FLAG_CONTENT_DIR, FLAG_TOP_DIR)) {
1232                         if (one_file_system > 1) {
1233                                 if (INFO_GTE(MOUNT, 1)) {
1234                                         rprintf(FINFO,
1235                                             "[%s] skipping mount-point dir %s\n",
1236                                             who_am_i(), thisname);
1237                                 }
1238                                 return NULL;
1239                         }
1240                         flags |= FLAG_MOUNT_DIR;
1241                         flags &= ~FLAG_CONTENT_DIR;
1242                 }
1243         } else
1244                 flags &= ~FLAG_CONTENT_DIR;
1245
1246         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
1247                 if (ignore_perishable)
1248                         non_perishable_cnt++;
1249                 return NULL;
1250         }
1251
1252         if (lp_ignore_nonreadable(module_id)) {
1253 #ifdef SUPPORT_LINKS
1254                 if (!S_ISLNK(st.st_mode))
1255 #endif
1256                         if (access(thisname, R_OK) != 0)
1257                                 return NULL;
1258         }
1259
1260   skip_filters:
1261
1262         /* Only divert a directory in the main transfer. */
1263         if (flist) {
1264                 if (flist->prev && S_ISDIR(st.st_mode)
1265                  && flags & FLAG_DIVERT_DIRS) {
1266                         /* Room for parent/sibling/next-child info. */
1267                         extra_len += DIRNODE_EXTRA_CNT * EXTRA_LEN;
1268                         if (relative_paths)
1269                                 extra_len += PTR_EXTRA_CNT * EXTRA_LEN;
1270                         pool = dir_flist->file_pool;
1271                 } else
1272                         pool = flist->file_pool;
1273         } else {
1274 #ifdef SUPPORT_ACLS
1275                 /* Directories need an extra int32 for the default ACL. */
1276                 if (preserve_acls && S_ISDIR(st.st_mode))
1277                         extra_len += EXTRA_LEN;
1278 #endif
1279                 pool = NULL;
1280         }
1281
1282         if (DEBUG_GTE(FLIST, 2)) {
1283                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1284                         who_am_i(), thisname, filter_level);
1285         }
1286
1287         if ((basename = strrchr(thisname, '/')) != NULL) {
1288                 int len = basename++ - thisname;
1289                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1290                         lastdir = new_array(char, len + 1);
1291                         memcpy(lastdir, thisname, len);
1292                         lastdir[len] = '\0';
1293                         lastdir_len = len;
1294                 }
1295         } else
1296                 basename = thisname;
1297         basename_len = strlen(basename) + 1; /* count the '\0' */
1298
1299 #ifdef SUPPORT_LINKS
1300         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1301 #else
1302         linkname_len = 0;
1303 #endif
1304
1305 #ifdef ST_MTIME_NSEC
1306         if (st.ST_MTIME_NSEC && protocol_version >= 31)
1307                 extra_len += EXTRA_LEN;
1308 #endif
1309 #if SIZEOF_CAPITAL_OFF_T >= 8
1310         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1311                 extra_len += EXTRA_LEN;
1312 #endif
1313
1314         if (always_checksum && am_sender && S_ISREG(st.st_mode)) {
1315                 file_checksum(thisname, tmp_sum, st.st_size);
1316                 if (sender_keeps_checksum)
1317                         extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
1318         }
1319
1320 #if EXTRA_ROUNDING > 0
1321         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1322                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1323 #endif
1324
1325         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1326                   + linkname_len;
1327         if (pool)
1328                 bp = pool_alloc(pool, alloc_len, "make_file");
1329         else {
1330                 if (!(bp = new_array(char, alloc_len)))
1331                         out_of_memory("make_file");
1332         }
1333
1334         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1335         bp += extra_len;
1336         file = (struct file_struct *)bp;
1337         bp += FILE_STRUCT_LEN;
1338
1339         memcpy(bp, basename, basename_len);
1340
1341 #ifdef SUPPORT_HARD_LINKS
1342         if (preserve_hard_links && flist && flist->prev) {
1343                 if (protocol_version >= 28
1344                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1345                  : S_ISREG(st.st_mode)) {
1346                         tmp_dev = (int64)st.st_dev;
1347                         tmp_ino = (int64)st.st_ino;
1348                 } else
1349                         tmp_dev = -1;
1350         }
1351 #endif
1352
1353 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1354         if (IS_DEVICE(st.st_mode)) {
1355                 tmp_rdev = st.st_rdev;
1356                 st.st_size = 0;
1357         } else if (IS_SPECIAL(st.st_mode))
1358                 st.st_size = 0;
1359 #endif
1360
1361         file->flags = flags;
1362         file->modtime = st.st_mtime;
1363 #ifdef ST_MTIME_NSEC
1364         if (st.ST_MTIME_NSEC && protocol_version >= 31) {
1365                 file->flags |= FLAG_MOD_NSEC;
1366                 OPT_EXTRA(file, 0)->unum = st.ST_MTIME_NSEC;
1367         }
1368 #endif
1369         file->len32 = (uint32)st.st_size;
1370 #if SIZEOF_CAPITAL_OFF_T >= 8
1371         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1372                 file->flags |= FLAG_LENGTH64;
1373                 OPT_EXTRA(file, NSEC_BUMP(file))->unum = (uint32)(st.st_size >> 32);
1374         }
1375 #endif
1376         file->mode = st.st_mode;
1377         if (uid_ndx) /* Check uid_ndx instead of preserve_uid for del support */
1378                 F_OWNER(file) = st.st_uid;
1379         if (gid_ndx) /* Check gid_ndx instead of preserve_gid for del support */
1380                 F_GROUP(file) = st.st_gid;
1381
1382         if (basename != thisname)
1383                 file->dirname = lastdir;
1384
1385 #ifdef SUPPORT_LINKS
1386         if (linkname_len)
1387                 memcpy(bp + basename_len, linkname, linkname_len);
1388 #endif
1389
1390         if (am_sender)
1391                 F_PATHNAME(file) = pathname;
1392         else if (!pool)
1393                 F_DEPTH(file) = extra_len / EXTRA_LEN;
1394
1395         if (basename_len == 0+1) {
1396                 if (!pool)
1397                         unmake_file(file);
1398                 return NULL;
1399         }
1400
1401         if (sender_keeps_checksum && S_ISREG(st.st_mode))
1402                 memcpy(F_SUM(file), tmp_sum, checksum_len);
1403
1404         if (unsort_ndx)
1405                 F_NDX(file) = stats.num_dirs;
1406
1407         return file;
1408 }
1409
1410 /* Only called for temporary file_struct entries created by make_file(). */
1411 void unmake_file(struct file_struct *file)
1412 {
1413         free(REQ_EXTRA(file, F_DEPTH(file)));
1414 }
1415
1416 static struct file_struct *send_file_name(int f, struct file_list *flist,
1417                                           const char *fname, STRUCT_STAT *stp,
1418                                           int flags, int filter_level)
1419 {
1420         struct file_struct *file;
1421
1422         file = make_file(fname, flist, stp, flags, filter_level);
1423         if (!file)
1424                 return NULL;
1425
1426         if (chmod_modes && !S_ISLNK(file->mode) && file->mode)
1427                 file->mode = tweak_mode(file->mode, chmod_modes);
1428
1429         if (f >= 0) {
1430                 char fbuf[MAXPATHLEN];
1431 #ifdef SUPPORT_LINKS
1432                 const char *symlink_name;
1433                 int symlink_len;
1434 #ifdef ICONV_OPTION
1435                 char symlink_buf[MAXPATHLEN];
1436 #endif
1437 #endif
1438 #if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
1439                 stat_x sx;
1440                 init_stat_x(&sx);
1441 #endif
1442
1443 #ifdef SUPPORT_LINKS
1444                 if (preserve_links && S_ISLNK(file->mode)) {
1445                         symlink_name = F_SYMLINK(file);
1446                         symlink_len = strlen(symlink_name);
1447                         if (symlink_len == 0) {
1448                                 io_error |= IOERR_GENERAL;
1449                                 f_name(file, fbuf);
1450                                 rprintf(FERROR_XFER,
1451                                     "skipping symlink with 0-length value: %s\n",
1452                                     full_fname(fbuf));
1453                                 return NULL;
1454                         }
1455                 } else {
1456                         symlink_name = NULL;
1457                         symlink_len = 0;
1458                 }
1459 #endif
1460
1461 #ifdef ICONV_OPTION
1462                 if (ic_send != (iconv_t)-1) {
1463                         xbuf outbuf, inbuf;
1464
1465                         INIT_CONST_XBUF(outbuf, fbuf);
1466
1467                         if (file->dirname) {
1468                                 INIT_XBUF_STRLEN(inbuf, (char*)file->dirname);
1469                                 outbuf.size -= 2; /* Reserve room for '/' & 1 more char. */
1470                                 if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0)
1471                                         goto convert_error;
1472                                 outbuf.size += 2;
1473                                 fbuf[outbuf.len++] = '/';
1474                         }
1475
1476                         INIT_XBUF_STRLEN(inbuf, (char*)file->basename);
1477                         if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0) {
1478                           convert_error:
1479                                 io_error |= IOERR_GENERAL;
1480                                 rprintf(FERROR_XFER,
1481                                     "[%s] cannot convert filename: %s (%s)\n",
1482                                     who_am_i(), f_name(file, fbuf), strerror(errno));
1483                                 return NULL;
1484                         }
1485                         fbuf[outbuf.len] = '\0';
1486
1487 #ifdef SUPPORT_LINKS
1488                         if (symlink_len && sender_symlink_iconv) {
1489                                 INIT_XBUF(inbuf, (char*)symlink_name, symlink_len, (size_t)-1);
1490                                 INIT_CONST_XBUF(outbuf, symlink_buf);
1491                                 if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0) {
1492                                         io_error |= IOERR_GENERAL;
1493                                         f_name(file, fbuf);
1494                                         rprintf(FERROR_XFER,
1495                                             "[%s] cannot convert symlink data for: %s (%s)\n",
1496                                             who_am_i(), full_fname(fbuf), strerror(errno));
1497                                         return NULL;
1498                                 }
1499                                 symlink_buf[outbuf.len] = '\0';
1500
1501                                 symlink_name = symlink_buf;
1502                                 symlink_len = outbuf.len;
1503                         }
1504 #endif
1505                 } else
1506 #endif
1507                         f_name(file, fbuf);
1508
1509 #ifdef SUPPORT_ACLS
1510                 if (preserve_acls && !S_ISLNK(file->mode)) {
1511                         sx.st.st_mode = file->mode;
1512                         if (get_acl(fname, &sx) < 0) {
1513                                 io_error |= IOERR_GENERAL;
1514                                 return NULL;
1515                         }
1516                 }
1517 #endif
1518 #ifdef SUPPORT_XATTRS
1519                 if (preserve_xattrs) {
1520                         sx.st.st_mode = file->mode;
1521                         if (get_xattr(fname, &sx) < 0) {
1522                                 io_error |= IOERR_GENERAL;
1523                                 return NULL;
1524                         }
1525                 }
1526 #endif
1527
1528                 send_file_entry(f, fbuf, file,
1529 #ifdef SUPPORT_LINKS
1530                                 symlink_name, symlink_len,
1531 #endif
1532                                 flist->used, flist->ndx_start);
1533
1534 #ifdef SUPPORT_ACLS
1535                 if (preserve_acls && !S_ISLNK(file->mode)) {
1536                         send_acl(f, &sx);
1537                         free_acl(&sx);
1538                 }
1539 #endif
1540 #ifdef SUPPORT_XATTRS
1541                 if (preserve_xattrs) {
1542                         F_XATTR(file) = send_xattr(f, &sx);
1543                         free_xattr(&sx);
1544                 }
1545 #endif
1546         }
1547
1548         maybe_emit_filelist_progress(flist->used + flist_count_offset);
1549
1550         flist_expand(flist, 1);
1551         flist->files[flist->used++] = file;
1552
1553         return file;
1554 }
1555
1556 static void send_if_directory(int f, struct file_list *flist,
1557                               struct file_struct *file,
1558                               char *fbuf, unsigned int ol,
1559                               int flags)
1560 {
1561         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1562
1563         if (S_ISDIR(file->mode)
1564             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1565                 void *save_filters;
1566                 unsigned int len = strlen(fbuf);
1567                 if (len > 1 && fbuf[len-1] == '/')
1568                         fbuf[--len] = '\0';
1569                 save_filters = push_local_filters(fbuf, len);
1570                 send_directory(f, flist, fbuf, len, flags);
1571                 pop_local_filters(save_filters);
1572                 fbuf[ol] = '\0';
1573                 if (is_dot_dir)
1574                         fbuf[ol-1] = '.';
1575         }
1576 }
1577
1578 static int file_compare(const void *file1, const void *file2)
1579 {
1580         return f_name_cmp(*(struct file_struct **)file1,
1581                           *(struct file_struct **)file2);
1582 }
1583
1584 /* The guts of a merge-sort algorithm.  This was derived from the glibc
1585  * version, but I (Wayne) changed the merge code to do less copying and
1586  * to require only half the amount of temporary memory. */
1587 static void fsort_tmp(struct file_struct **fp, size_t num,
1588                       struct file_struct **tmp)
1589 {
1590         struct file_struct **f1, **f2, **t;
1591         size_t n1, n2;
1592
1593         n1 = num / 2;
1594         n2 = num - n1;
1595         f1 = fp;
1596         f2 = fp + n1;
1597
1598         if (n1 > 1)
1599                 fsort_tmp(f1, n1, tmp);
1600         if (n2 > 1)
1601                 fsort_tmp(f2, n2, tmp);
1602
1603         while (f_name_cmp(*f1, *f2) <= 0) {
1604                 if (!--n1)
1605                         return;
1606                 f1++;
1607         }
1608
1609         t = tmp;
1610         memcpy(t, f1, n1 * PTR_SIZE);
1611
1612         *f1++ = *f2++, n2--;
1613
1614         while (n1 > 0 && n2 > 0) {
1615                 if (f_name_cmp(*t, *f2) <= 0)
1616                         *f1++ = *t++, n1--;
1617                 else
1618                         *f1++ = *f2++, n2--;
1619         }
1620
1621         if (n1 > 0)
1622                 memcpy(f1, t, n1 * PTR_SIZE);
1623 }
1624
1625 /* This file-struct sorting routine makes sure that any identical names in
1626  * the file list stay in the same order as they were in the original list.
1627  * This is particularly vital in inc_recurse mode where we expect a sort
1628  * on the flist to match the exact order of a sort on the dir_flist. */
1629 static void fsort(struct file_struct **fp, size_t num)
1630 {
1631         if (num <= 1)
1632                 return;
1633
1634         if (use_qsort)
1635                 qsort(fp, num, PTR_SIZE, file_compare);
1636         else {
1637                 struct file_struct **tmp = new_array(struct file_struct *,
1638                                                      (num+1) / 2);
1639                 fsort_tmp(fp, num, tmp);
1640                 free(tmp);
1641         }
1642 }
1643
1644 /* We take an entire set of sibling dirs from the sorted flist and link them
1645  * into the tree, setting the appropriate parent/child/sibling pointers. */
1646 static void add_dirs_to_tree(int parent_ndx, struct file_list *from_flist,
1647                              int dir_cnt)
1648 {
1649         int i;
1650         int32 *dp = NULL;
1651         int32 *parent_dp = parent_ndx < 0 ? NULL
1652                          : F_DIR_NODE_P(dir_flist->sorted[parent_ndx]);
1653
1654         flist_expand(dir_flist, dir_cnt);
1655         dir_flist->sorted = dir_flist->files;
1656
1657         for (i = 0; dir_cnt; i++) {
1658                 struct file_struct *file = from_flist->sorted[i];
1659
1660                 if (!S_ISDIR(file->mode))
1661                         continue;
1662
1663                 dir_flist->files[dir_flist->used++] = file;
1664                 dir_cnt--;
1665
1666                 if (file->basename[0] == '.' && file->basename[1] == '\0')
1667                         continue;
1668
1669                 if (dp)
1670                         DIR_NEXT_SIBLING(dp) = dir_flist->used - 1;
1671                 else if (parent_dp)
1672                         DIR_FIRST_CHILD(parent_dp) = dir_flist->used - 1;
1673                 else
1674                         send_dir_ndx = dir_flist->used - 1;
1675
1676                 dp = F_DIR_NODE_P(file);
1677                 DIR_PARENT(dp) = parent_ndx;
1678                 DIR_FIRST_CHILD(dp) = -1;
1679         }
1680         if (dp)
1681                 DIR_NEXT_SIBLING(dp) = -1;
1682 }
1683
1684 static void interpret_stat_error(const char *fname, int is_dir)
1685 {
1686         if (errno == ENOENT) {
1687                 io_error |= IOERR_VANISHED;
1688                 rprintf(FWARNING, "%s has vanished: %s\n",
1689                         is_dir ? "directory" : "file", full_fname(fname));
1690         } else {
1691                 io_error |= IOERR_GENERAL;
1692                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
1693                         full_fname(fname));
1694         }
1695 }
1696
1697 /* This function is normally called by the sender, but the receiving side also
1698  * calls it from get_dirlist() with f set to -1 so that we just construct the
1699  * file list in memory without sending it over the wire.  Also, get_dirlist()
1700  * might call this with f set to -2, which also indicates that local filter
1701  * rules should be ignored. */
1702 static void send_directory(int f, struct file_list *flist, char *fbuf, int len,
1703                            int flags)
1704 {
1705         struct dirent *di;
1706         unsigned remainder;
1707         char *p;
1708         DIR *d;
1709         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1710         int start = flist->used;
1711         int filter_level = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1712
1713         assert(flist != NULL);
1714
1715         if (!(d = opendir(fbuf))) {
1716                 if (errno == ENOENT) {
1717                         if (am_sender) /* Can abuse this for vanished error w/ENOENT: */
1718                                 interpret_stat_error(fbuf, True);
1719                         return;
1720                 }
1721                 io_error |= IOERR_GENERAL;
1722                 rsyserr(FERROR_XFER, errno, "opendir %s failed", full_fname(fbuf));
1723                 return;
1724         }
1725
1726         p = fbuf + len;
1727         if (len == 1 && *fbuf == '/')
1728                 remainder = MAXPATHLEN - 1;
1729         else if (len < MAXPATHLEN-1) {
1730                 *p++ = '/';
1731                 *p = '\0';
1732                 remainder = MAXPATHLEN - (len + 1);
1733         } else
1734                 remainder = 0;
1735
1736         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1737                 char *dname = d_name(di);
1738                 if (dname[0] == '.' && (dname[1] == '\0'
1739                     || (dname[1] == '.' && dname[2] == '\0')))
1740                         continue;
1741                 unsigned name_len = strlcpy(p, dname, remainder);
1742                 if (name_len >= remainder) {
1743                         char save = fbuf[len];
1744                         fbuf[len] = '\0';
1745                         io_error |= IOERR_GENERAL;
1746                         rprintf(FERROR_XFER,
1747                                 "filename overflows max-path len by %u: %s/%s\n",
1748                                 name_len - remainder + 1, fbuf, dname);
1749                         fbuf[len] = save;
1750                         continue;
1751                 }
1752                 if (dname[0] == '\0') {
1753                         io_error |= IOERR_GENERAL;
1754                         rprintf(FERROR_XFER,
1755                                 "cannot send file with empty name in %s\n",
1756                                 full_fname(fbuf));
1757                         continue;
1758                 }
1759
1760                 send_file_name(f, flist, fbuf, NULL, flags, filter_level);
1761         }
1762
1763         fbuf[len] = '\0';
1764
1765         if (errno) {
1766                 io_error |= IOERR_GENERAL;
1767                 rsyserr(FERROR_XFER, errno, "readdir(%s)", full_fname(fbuf));
1768         }
1769
1770         closedir(d);
1771
1772         if (f >= 0 && recurse && !divert_dirs) {
1773                 int i, end = flist->used - 1;
1774                 /* send_if_directory() bumps flist->used, so use "end". */
1775                 for (i = start; i <= end; i++)
1776                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1777         }
1778 }
1779
1780 static void send_implied_dirs(int f, struct file_list *flist, char *fname,
1781                               char *start, char *limit, int flags, char name_type)
1782 {
1783         static char lastpath[MAXPATHLEN] = "";
1784         static int lastpath_len = 0;
1785         static struct file_struct *lastpath_struct = NULL;
1786         struct file_struct *file;
1787         item_list *relname_list;
1788         relnamecache **rnpp;
1789         int len, need_new_dir, depth = 0;
1790         filter_rule_list save_filter_list = filter_list;
1791
1792         flags = (flags | FLAG_IMPLIED_DIR) & ~(FLAG_TOP_DIR | FLAG_CONTENT_DIR);
1793         filter_list.head = filter_list.tail = NULL; /* Don't filter implied dirs. */
1794
1795         if (inc_recurse) {
1796                 if (lastpath_struct && F_PATHNAME(lastpath_struct) == pathname
1797                  && lastpath_len == limit - fname
1798                  && strncmp(lastpath, fname, lastpath_len) == 0)
1799                         need_new_dir = 0;
1800                 else
1801                         need_new_dir = 1;
1802         } else {
1803                 char *tp = fname, *lp = lastpath;
1804                 /* Skip any initial directories in our path that we
1805                  * have in common with lastpath. */
1806                 assert(start == fname);
1807                 for ( ; ; tp++, lp++) {
1808                         if (tp == limit) {
1809                                 if (*lp == '/' || *lp == '\0')
1810                                         goto done;
1811                                 break;
1812                         }
1813                         if (*lp != *tp)
1814                                 break;
1815                         if (*tp == '/') {
1816                                 start = tp;
1817                                 depth++;
1818                         }
1819                 }
1820                 need_new_dir = 1;
1821         }
1822
1823         if (need_new_dir) {
1824                 int save_copy_links = copy_links;
1825                 int save_xfer_dirs = xfer_dirs;
1826                 char *slash;
1827
1828                 copy_links = xfer_dirs = 1;
1829
1830                 *limit = '\0';
1831
1832                 for (slash = start; (slash = strchr(slash+1, '/')) != NULL; ) {
1833                         *slash = '\0';
1834                         file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1835                         depth++;
1836                         if (!inc_recurse && file && S_ISDIR(file->mode))
1837                                 change_local_filter_dir(fname, strlen(fname), depth);
1838                         *slash = '/';
1839                 }
1840
1841                 file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1842                 if (inc_recurse) {
1843                         if (file && !S_ISDIR(file->mode))
1844                                 file = NULL;
1845                         lastpath_struct = file;
1846                 } else if (file && S_ISDIR(file->mode))
1847                         change_local_filter_dir(fname, strlen(fname), ++depth);
1848
1849                 strlcpy(lastpath, fname, sizeof lastpath);
1850                 lastpath_len = limit - fname;
1851
1852                 *limit = '/';
1853
1854                 copy_links = save_copy_links;
1855                 xfer_dirs = save_xfer_dirs;
1856
1857                 if (!inc_recurse)
1858                         goto done;
1859         }
1860
1861         if (!lastpath_struct)
1862                 goto done; /* dir must have vanished */
1863
1864         len = strlen(limit+1);
1865         memcpy(&relname_list, F_DIR_RELNAMES_P(lastpath_struct), sizeof relname_list);
1866         if (!relname_list) {
1867                 if (!(relname_list = new0(item_list)))
1868                         out_of_memory("send_implied_dirs");
1869                 memcpy(F_DIR_RELNAMES_P(lastpath_struct), &relname_list, sizeof relname_list);
1870         }
1871         rnpp = EXPAND_ITEM_LIST(relname_list, relnamecache *, 32);
1872         if (!(*rnpp = (relnamecache*)new_array(char, sizeof (relnamecache) + len)))
1873                 out_of_memory("send_implied_dirs");
1874         (*rnpp)->name_type = name_type;
1875         strlcpy((*rnpp)->fname, limit+1, len + 1);
1876
1877 done:
1878         filter_list = save_filter_list;
1879 }
1880
1881 static NORETURN void fatal_unsafe_io_error(void)
1882 {
1883         /* This (sadly) can only happen when pushing data because
1884          * the sender does not know about what kind of delete
1885          * is in effect on the receiving side when pulling. */
1886         rprintf(FERROR_XFER, "FATAL I/O ERROR: dying to avoid a --delete-during issue with a pre-3.0.7 receiver.\n");
1887         exit_cleanup(RERR_UNSUPPORTED);
1888 }
1889
1890 static void send1extra(int f, struct file_struct *file, struct file_list *flist)
1891 {
1892         char fbuf[MAXPATHLEN];
1893         item_list *relname_list;
1894         int len, dlen, flags = FLAG_DIVERT_DIRS | FLAG_CONTENT_DIR;
1895         size_t j;
1896
1897         f_name(file, fbuf);
1898         dlen = strlen(fbuf);
1899
1900         if (!change_pathname(file, NULL, 0))
1901                 exit_cleanup(RERR_FILESELECT);
1902
1903         change_local_filter_dir(fbuf, dlen, send_dir_depth);
1904
1905         if (file->flags & FLAG_CONTENT_DIR) {
1906                 if (one_file_system) {
1907                         STRUCT_STAT st;
1908                         if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1909                                 interpret_stat_error(fbuf, True);
1910                                 return;
1911                         }
1912                         filesystem_dev = st.st_dev;
1913                 }
1914                 send_directory(f, flist, fbuf, dlen, flags);
1915         }
1916
1917         if (!relative_paths)
1918                 return;
1919
1920         memcpy(&relname_list, F_DIR_RELNAMES_P(file), sizeof relname_list);
1921         if (!relname_list)
1922                 return;
1923
1924         for (j = 0; j < relname_list->count; j++) {
1925                 char *slash;
1926                 relnamecache *rnp = ((relnamecache**)relname_list->items)[j];
1927                 char name_type = rnp->name_type;
1928
1929                 fbuf[dlen] = '/';
1930                 len = strlcpy(fbuf + dlen + 1, rnp->fname, sizeof fbuf - dlen - 1);
1931                 free(rnp);
1932                 if (len >= (int)sizeof fbuf)
1933                         continue; /* Impossible... */
1934
1935                 slash = strchr(fbuf+dlen+1, '/');
1936                 if (slash) {
1937                         send_implied_dirs(f, flist, fbuf, fbuf+dlen+1, slash, flags, name_type);
1938                         continue;
1939                 }
1940
1941                 if (name_type != NORMAL_NAME) {
1942                         STRUCT_STAT st;
1943                         if (link_stat(fbuf, &st, 1) != 0) {
1944                                 interpret_stat_error(fbuf, True);
1945                                 continue;
1946                         }
1947                         send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR | flags, ALL_FILTERS);
1948                 } else
1949                         send_file_name(f, flist, fbuf, NULL, FLAG_TOP_DIR | flags, ALL_FILTERS);
1950         }
1951
1952         free(relname_list);
1953 }
1954
1955 void send_extra_file_list(int f, int at_least)
1956 {
1957         struct file_list *flist;
1958         int64 start_write;
1959         uint16 prev_flags;
1960         int save_io_error = io_error;
1961
1962         if (flist_eof)
1963                 return;
1964
1965         if (at_least < 0)
1966                 at_least = file_total - file_old_total + 1;
1967
1968         /* Keep sending data until we have the requested number of
1969          * files in the upcoming file-lists. */
1970         while (file_total - file_old_total < at_least) {
1971                 struct file_struct *file = dir_flist->sorted[send_dir_ndx];
1972                 int dir_ndx, dstart = stats.num_dirs;
1973                 const char *pathname = F_PATHNAME(file);
1974                 int32 *dp;
1975
1976                 flist = flist_new(0, "send_extra_file_list");
1977                 start_write = stats.total_written;
1978
1979                 if (unsort_ndx)
1980                         dir_ndx = F_NDX(file);
1981                 else
1982                         dir_ndx = send_dir_ndx;
1983                 write_ndx(f, NDX_FLIST_OFFSET - dir_ndx);
1984                 flist->parent_ndx = dir_ndx;
1985
1986                 send1extra(f, file, flist);
1987                 prev_flags = file->flags;
1988                 dp = F_DIR_NODE_P(file);
1989
1990                 /* If there are any duplicate directory names that follow, we
1991                  * send all the dirs together in one file-list.  The dir_flist
1992                  * tree links all the child subdirs onto the last dup dir. */
1993                 while ((dir_ndx = DIR_NEXT_SIBLING(dp)) >= 0
1994                     && dir_flist->sorted[dir_ndx]->flags & FLAG_DUPLICATE) {
1995                         send_dir_ndx = dir_ndx;
1996                         file = dir_flist->sorted[dir_ndx];
1997                         /* Try to avoid some duplicate scanning of identical dirs. */
1998                         if (F_PATHNAME(file) == pathname && prev_flags & FLAG_CONTENT_DIR)
1999                                 file->flags &= ~FLAG_CONTENT_DIR;
2000                         send1extra(f, file, flist);
2001                         prev_flags = file->flags;
2002                         dp = F_DIR_NODE_P(file);
2003                 }
2004
2005                 if (io_error == save_io_error || ignore_errors)
2006                         write_byte(f, 0);
2007                 else if (use_safe_inc_flist) {
2008                         write_shortint(f, XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST);
2009                         write_varint(f, io_error);
2010                 } else {
2011                         if (delete_during)
2012                                 fatal_unsafe_io_error();
2013                         write_byte(f, 0);
2014                 }
2015
2016                 if (need_unsorted_flist) {
2017                         if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2018                                 out_of_memory("send_extra_file_list");
2019                         memcpy(flist->sorted, flist->files,
2020                                flist->used * sizeof (struct file_struct*));
2021                 } else
2022                         flist->sorted = flist->files;
2023
2024                 flist_sort_and_clean(flist, 0);
2025
2026                 add_dirs_to_tree(send_dir_ndx, flist, stats.num_dirs - dstart);
2027                 flist_done_allocating(flist);
2028
2029                 file_total += flist->used;
2030                 stats.flist_size += stats.total_written - start_write;
2031                 stats.num_files += flist->used;
2032                 if (DEBUG_GTE(FLIST, 3))
2033                         output_flist(flist);
2034
2035                 if (DIR_FIRST_CHILD(dp) >= 0) {
2036                         send_dir_ndx = DIR_FIRST_CHILD(dp);
2037                         send_dir_depth++;
2038                 } else {
2039                         while (DIR_NEXT_SIBLING(dp) < 0) {
2040                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
2041                                         write_ndx(f, NDX_FLIST_EOF);
2042                                         flist_eof = 1;
2043                                         if (DEBUG_GTE(FLIST, 3))
2044                                                 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2045                                         change_local_filter_dir(NULL, 0, 0);
2046                                         goto finish;
2047                                 }
2048                                 send_dir_depth--;
2049                                 file = dir_flist->sorted[send_dir_ndx];
2050                                 dp = F_DIR_NODE_P(file);
2051                         }
2052                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
2053                 }
2054         }
2055
2056   finish:
2057         if (io_error != save_io_error && protocol_version == 30 && !ignore_errors)
2058                 send_msg_int(MSG_IO_ERROR, io_error);
2059 }
2060
2061 struct file_list *send_file_list(int f, int argc, char *argv[])
2062 {
2063         static const char *lastdir;
2064         static int lastdir_len = -1;
2065         int len, dirlen;
2066         STRUCT_STAT st;
2067         char *p, *dir;
2068         struct file_list *flist;
2069         struct timeval start_tv, end_tv;
2070         int64 start_write;
2071         int use_ff_fd = 0;
2072         int disable_buffering, reenable_multiplex = -1;
2073         int flags = recurse ? FLAG_CONTENT_DIR : 0;
2074         int reading_remotely = filesfrom_host != NULL;
2075         int rl_flags = (reading_remotely ? 0 : RL_DUMP_COMMENTS)
2076 #ifdef ICONV_OPTION
2077                      | (filesfrom_convert ? RL_CONVERT : 0)
2078 #endif
2079                      | (eol_nulls || reading_remotely ? RL_EOL_NULLS : 0);
2080         int implied_dot_dir = 0;
2081
2082         rprintf(FLOG, "building file list\n");
2083         if (show_filelist_p())
2084                 start_filelist_progress("building file list");
2085         else if (inc_recurse && INFO_GTE(FLIST, 1) && !am_server)
2086                 rprintf(FCLIENT, "sending incremental file list\n");
2087
2088         start_write = stats.total_written;
2089         gettimeofday(&start_tv, NULL);
2090
2091         if (relative_paths && protocol_version >= 30)
2092                 implied_dirs = 1; /* We send flagged implied dirs */
2093
2094 #ifdef SUPPORT_HARD_LINKS
2095         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
2096                 init_hard_links();
2097 #endif
2098
2099         flist = cur_flist = flist_new(0, "send_file_list");
2100         if (inc_recurse) {
2101                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
2102                 flags |= FLAG_DIVERT_DIRS;
2103         } else
2104                 dir_flist = cur_flist;
2105
2106         disable_buffering = io_start_buffering_out(f);
2107         if (filesfrom_fd >= 0) {
2108                 if (argv[0] && !change_dir(argv[0], CD_NORMAL)) {
2109                         rsyserr(FERROR_XFER, errno, "change_dir %s failed",
2110                                 full_fname(argv[0]));
2111                         exit_cleanup(RERR_FILESELECT);
2112                 }
2113                 if (protocol_version < 31) {
2114                         /* Older protocols send the files-from data w/o packaging
2115                          * it in multiplexed I/O packets, so temporarily switch
2116                          * to buffered I/O to match this behavior. */
2117                         reenable_multiplex = io_end_multiplex_in(MPLX_TO_BUFFERED);
2118                 }
2119                 use_ff_fd = 1;
2120         }
2121
2122         if (!orig_dir)
2123                 orig_dir = strdup(curr_dir);
2124
2125         while (1) {
2126                 char fbuf[MAXPATHLEN], *fn, name_type;
2127
2128                 if (use_ff_fd) {
2129                         if (read_line(filesfrom_fd, fbuf, sizeof fbuf, rl_flags) == 0)
2130                                 break;
2131                         sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
2132                 } else {
2133                         if (argc-- == 0)
2134                                 break;
2135                         strlcpy(fbuf, *argv++, MAXPATHLEN);
2136                         if (sanitize_paths)
2137                                 sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
2138                 }
2139
2140                 len = strlen(fbuf);
2141                 if (relative_paths) {
2142                         /* We clean up fbuf below. */
2143                         name_type = NORMAL_NAME;
2144                 } else if (!len || fbuf[len - 1] == '/') {
2145                         if (len == 2 && fbuf[0] == '.') {
2146                                 /* Turn "./" into just "." rather than "./." */
2147                                 fbuf[--len] = '\0';
2148                         } else {
2149                                 if (len + 1 >= MAXPATHLEN)
2150                                         overflow_exit("send_file_list");
2151                                 fbuf[len++] = '.';
2152                                 fbuf[len] = '\0';
2153                         }
2154                         name_type = DOTDIR_NAME;
2155                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
2156                     && (len == 2 || fbuf[len-3] == '/')) {
2157                         if (len + 2 >= MAXPATHLEN)
2158                                 overflow_exit("send_file_list");
2159                         fbuf[len++] = '/';
2160                         fbuf[len++] = '.';
2161                         fbuf[len] = '\0';
2162                         name_type = DOTDIR_NAME;
2163                 } else if (fbuf[len-1] == '.' && (len == 1 || fbuf[len-2] == '/'))
2164                         name_type = DOTDIR_NAME;
2165                 else
2166                         name_type = NORMAL_NAME;
2167
2168                 dir = NULL;
2169
2170                 if (!relative_paths) {
2171                         p = strrchr(fbuf, '/');
2172                         if (p) {
2173                                 *p = '\0';
2174                                 if (p == fbuf)
2175                                         dir = "/";
2176                                 else
2177                                         dir = fbuf;
2178                                 len -= p - fbuf + 1;
2179                                 fn = p + 1;
2180                         } else
2181                                 fn = fbuf;
2182                 } else {
2183                         if ((p = strstr(fbuf, "/./")) != NULL) {
2184                                 *p = '\0';
2185                                 if (p == fbuf)
2186                                         dir = "/";
2187                                 else {
2188                                         dir = fbuf;
2189                                         clean_fname(dir, 0);
2190                                 }
2191                                 fn = p + 3;
2192                                 while (*fn == '/')
2193                                         fn++;
2194                                 if (!*fn)
2195                                         *--fn = '\0'; /* ensure room for '.' */
2196                         } else
2197                                 fn = fbuf;
2198                         /* A leading ./ can be used in relative mode to affect
2199                          * the dest dir without its name being in the path. */
2200                         if (*fn == '.' && fn[1] == '/' && !implied_dot_dir) {
2201                                 send_file_name(f, flist, ".", NULL,
2202                                     (flags | FLAG_IMPLIED_DIR) & ~FLAG_CONTENT_DIR,
2203                                     ALL_FILTERS);
2204                                 implied_dot_dir = 1;
2205                         }
2206                         len = clean_fname(fn, CFN_KEEP_TRAILING_SLASH
2207                                             | CFN_DROP_TRAILING_DOT_DIR);
2208                         if (len == 1) {
2209                                 if (fn[0] == '/') {
2210                                         fn = "/.";
2211                                         len = 2;
2212                                         name_type = DOTDIR_NAME;
2213                                 } else if (fn[0] == '.')
2214                                         name_type = DOTDIR_NAME;
2215                         } else if (fn[len-1] == '/') {
2216                                 fn[--len] = '\0';
2217                                 if (len == 1 && *fn == '.')
2218                                         name_type = DOTDIR_NAME;
2219                                 else
2220                                         name_type = SLASH_ENDING_NAME;
2221                         }
2222                         /* Reject a ".." dir in the active part of the path. */
2223                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
2224                                 if ((p[2] == '/' || p[2] == '\0')
2225                                  && (p == fn || p[-1] == '/')) {
2226                                         rprintf(FERROR,
2227                                             "found \"..\" dir in relative path: %s\n",
2228                                             fn);
2229                                         exit_cleanup(RERR_SYNTAX);
2230                                 }
2231                         }
2232                 }
2233
2234                 if (!*fn) {
2235                         len = 1;
2236                         fn = ".";
2237                         name_type = DOTDIR_NAME;
2238                 }
2239
2240                 dirlen = dir ? strlen(dir) : 0;
2241                 if (dirlen != lastdir_len || memcmp(lastdir, dir, dirlen) != 0) {
2242                         if (!change_pathname(NULL, dir, -dirlen))
2243                                 continue;
2244                         lastdir = pathname;
2245                         lastdir_len = pathname_len;
2246                 } else if (!change_pathname(NULL, lastdir, lastdir_len))
2247                         continue;
2248
2249                 if (fn != fbuf)
2250                         memmove(fbuf, fn, len + 1);
2251
2252                 if (link_stat(fbuf, &st, copy_dirlinks || name_type != NORMAL_NAME) != 0
2253                  || (name_type != DOTDIR_NAME && is_daemon_excluded(fbuf, S_ISDIR(st.st_mode)))
2254                  || (relative_paths && path_is_daemon_excluded(fbuf, 1))) {
2255                         if (errno != ENOENT || missing_args == 0) {
2256                                 /* This is a transfer error, but inhibit deletion
2257                                  * only if we might be omitting an existing file. */
2258                                 if (errno != ENOENT)
2259                                         io_error |= IOERR_GENERAL;
2260                                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
2261                                         full_fname(fbuf));
2262                                 continue;
2263                         } else if (missing_args == 1) {
2264                                 /* Just ignore the arg. */
2265                                 continue;
2266                         } else /* (missing_args == 2) */ {
2267                                 /* Send the arg as a "missing" entry with
2268                                  * mode 0, which tells the generator to delete it. */
2269                                 memset(&st, 0, sizeof st);
2270                         }
2271                 }
2272
2273                 /* A dot-dir should not be excluded! */
2274                 if (name_type != DOTDIR_NAME && st.st_mode != 0
2275                  && is_excluded(fbuf, S_ISDIR(st.st_mode) != 0, ALL_FILTERS))
2276                         continue;
2277
2278                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
2279                         rprintf(FINFO, "skipping directory %s\n", fbuf);
2280                         continue;
2281                 }
2282
2283                 if (inc_recurse && relative_paths && *fbuf) {
2284                         if ((p = strchr(fbuf+1, '/')) != NULL) {
2285                                 if (p - fbuf == 1 && *fbuf == '.') {
2286                                         if ((fn = strchr(p+1, '/')) != NULL)
2287                                                 p = fn;
2288                                 } else
2289                                         fn = p;
2290                                 send_implied_dirs(f, flist, fbuf, fbuf, p, flags, name_type);
2291                                 if (fn == p)
2292                                         continue;
2293                         }
2294                 } else if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
2295                         /* Send the implied directories at the start of the
2296                          * source spec, so we get their permissions right. */
2297                         send_implied_dirs(f, flist, fbuf, fbuf, p, flags, 0);
2298                 }
2299
2300                 if (one_file_system)
2301                         filesystem_dev = st.st_dev;
2302
2303                 if (recurse || (xfer_dirs && name_type != NORMAL_NAME)) {
2304                         struct file_struct *file;
2305                         file = send_file_name(f, flist, fbuf, &st,
2306                                               FLAG_TOP_DIR | FLAG_CONTENT_DIR | flags,
2307                                               NO_FILTERS);
2308                         if (!file)
2309                                 continue;
2310                         if (inc_recurse) {
2311                                 if (name_type == DOTDIR_NAME) {
2312                                         if (send_dir_depth < 0) {
2313                                                 send_dir_depth = 0;
2314                                                 change_local_filter_dir(fbuf, len, send_dir_depth);
2315                                         }
2316                                         send_directory(f, flist, fbuf, len, flags);
2317                                 }
2318                         } else
2319                                 send_if_directory(f, flist, file, fbuf, len, flags);
2320                 } else
2321                         send_file_name(f, flist, fbuf, &st, flags, NO_FILTERS);
2322         }
2323
2324         if (reenable_multiplex >= 0)
2325                 io_start_multiplex_in(reenable_multiplex);
2326
2327         gettimeofday(&end_tv, NULL);
2328         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2329                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2330         if (stats.flist_buildtime == 0)
2331                 stats.flist_buildtime = 1;
2332         start_tv = end_tv;
2333
2334         /* Indicate end of file list */
2335         if (io_error == 0 || ignore_errors)
2336                 write_byte(f, 0);
2337         else if (use_safe_inc_flist) {
2338                 write_shortint(f, XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST);
2339                 write_varint(f, io_error);
2340         } else {
2341                 if (delete_during && inc_recurse)
2342                         fatal_unsafe_io_error();
2343                 write_byte(f, 0);
2344         }
2345
2346 #ifdef SUPPORT_HARD_LINKS
2347         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
2348                 idev_destroy();
2349 #endif
2350
2351         if (show_filelist_p())
2352                 finish_filelist_progress(flist);
2353
2354         gettimeofday(&end_tv, NULL);
2355         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2356                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2357
2358         /* When converting names, both sides keep an unsorted file-list array
2359          * because the names will differ on the sending and receiving sides
2360          * (both sides will use the unsorted index number for each item). */
2361
2362         /* Sort the list without removing any duplicates.  This allows the
2363          * receiving side to ask for whatever name it kept.  For incremental
2364          * recursion mode, the sender marks duplicate dirs so that it can
2365          * send them together in a single file-list. */
2366         if (need_unsorted_flist) {
2367                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2368                         out_of_memory("send_file_list");
2369                 memcpy(flist->sorted, flist->files,
2370                        flist->used * sizeof (struct file_struct*));
2371         } else
2372                 flist->sorted = flist->files;
2373         flist_sort_and_clean(flist, 0);
2374         file_total += flist->used;
2375         file_old_total += flist->used;
2376
2377         if (numeric_ids <= 0 && !inc_recurse)
2378                 send_id_list(f);
2379
2380         /* send the io_error flag */
2381         if (protocol_version < 30)
2382                 write_int(f, ignore_errors ? 0 : io_error);
2383         else if (!use_safe_inc_flist && io_error && !ignore_errors)
2384                 send_msg_int(MSG_IO_ERROR, io_error);
2385
2386         if (disable_buffering)
2387                 io_end_buffering_out(IOBUF_FREE_BUFS);
2388
2389         stats.flist_size = stats.total_written - start_write;
2390         stats.num_files = flist->used;
2391
2392         if (DEBUG_GTE(FLIST, 3))
2393                 output_flist(flist);
2394
2395         if (DEBUG_GTE(FLIST, 2))
2396                 rprintf(FINFO, "send_file_list done\n");
2397
2398         if (inc_recurse) {
2399                 send_dir_depth = 1;
2400                 add_dirs_to_tree(-1, flist, stats.num_dirs);
2401                 if (!file_total || strcmp(flist->sorted[flist->low]->basename, ".") != 0)
2402                         flist->parent_ndx = -1;
2403                 flist_done_allocating(flist);
2404                 if (send_dir_ndx < 0) {
2405                         write_ndx(f, NDX_FLIST_EOF);
2406                         flist_eof = 1;
2407                         if (DEBUG_GTE(FLIST, 3))
2408                                 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2409                 }
2410                 else if (file_total == 1) {
2411                         /* If we're creating incremental file-lists and there
2412                          * was just 1 item in the first file-list, send 1 more
2413                          * file-list to check if this is a 1-file xfer. */
2414                         send_extra_file_list(f, 1);
2415                 }
2416         } else {
2417                 flist_eof = 1;
2418                 if (DEBUG_GTE(FLIST, 3))
2419                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2420         }
2421
2422         return flist;
2423 }
2424
2425 struct file_list *recv_file_list(int f)
2426 {
2427         struct file_list *flist;
2428         int dstart, flags;
2429         int64 start_read;
2430
2431         if (!first_flist) {
2432                 if (show_filelist_p())
2433                         start_filelist_progress("receiving file list");
2434                 else if (inc_recurse && INFO_GTE(FLIST, 1) && !am_server)
2435                         rprintf(FCLIENT, "receiving incremental file list\n");
2436                 rprintf(FLOG, "receiving file list\n");
2437                 if (usermap)
2438                         parse_name_map(usermap, True);
2439                 if (groupmap)
2440                         parse_name_map(groupmap, False);
2441         }
2442
2443         start_read = stats.total_read;
2444
2445 #ifdef SUPPORT_HARD_LINKS
2446         if (preserve_hard_links && !first_flist)
2447                 init_hard_links();
2448 #endif
2449
2450         flist = flist_new(0, "recv_file_list");
2451
2452         if (inc_recurse) {
2453                 if (flist->ndx_start == 1)
2454                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
2455                 dstart = dir_flist->used;
2456         } else {
2457                 dir_flist = flist;
2458                 dstart = 0;
2459         }
2460
2461         while ((flags = read_byte(f)) != 0) {
2462                 struct file_struct *file;
2463
2464                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
2465                         flags |= read_byte(f) << 8;
2466
2467                 if (flags == (XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST)) {
2468                         int err;
2469                         if (!use_safe_inc_flist) {
2470                                 rprintf(FERROR, "Invalid flist flag: %x\n", flags);
2471                                 exit_cleanup(RERR_PROTOCOL);
2472                         }
2473                         err = read_varint(f);
2474                         if (!ignore_errors)
2475                                 io_error |= err;
2476                         break;
2477                 }
2478
2479                 flist_expand(flist, 1);
2480                 file = recv_file_entry(f, flist, flags);
2481
2482                 if (S_ISREG(file->mode)) {
2483                         /* Already counted */
2484                 } else if (S_ISDIR(file->mode)) {
2485                         if (inc_recurse) {
2486                                 flist_expand(dir_flist, 1);
2487                                 dir_flist->files[dir_flist->used++] = file;
2488                         }
2489                         stats.num_dirs++;
2490                 } else if (S_ISLNK(file->mode))
2491                         stats.num_symlinks++;
2492                 else if (IS_DEVICE(file->mode))
2493                         stats.num_symlinks++;
2494                 else
2495                         stats.num_specials++;
2496
2497                 flist->files[flist->used++] = file;
2498
2499                 maybe_emit_filelist_progress(flist->used);
2500
2501                 if (DEBUG_GTE(FLIST, 2)) {
2502                         char *name = f_name(file, NULL);
2503                         rprintf(FINFO, "recv_file_name(%s)\n", NS(name));
2504                 }
2505         }
2506         file_total += flist->used;
2507
2508         if (DEBUG_GTE(FLIST, 2))
2509                 rprintf(FINFO, "received %d names\n", flist->used);
2510
2511         if (show_filelist_p())
2512                 finish_filelist_progress(flist);
2513
2514         if (need_unsorted_flist) {
2515                 /* Create an extra array of index pointers that we can sort for
2516                  * the generator's use (for wading through the files in sorted
2517                  * order and for calling flist_find()).  We keep the "files"
2518                  * list unsorted for our exchange of index numbers with the
2519                  * other side (since their names may not sort the same). */
2520                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2521                         out_of_memory("recv_file_list");
2522                 memcpy(flist->sorted, flist->files,
2523                        flist->used * sizeof (struct file_struct*));
2524                 if (inc_recurse && dir_flist->used > dstart) {
2525                         static int dir_flist_malloced = 0;
2526                         if (dir_flist_malloced < dir_flist->malloced) {
2527                                 dir_flist->sorted = realloc_array(dir_flist->sorted,
2528                                                         struct file_struct *,
2529                                                         dir_flist->malloced);
2530                                 dir_flist_malloced = dir_flist->malloced;
2531                         }
2532                         memcpy(dir_flist->sorted + dstart, dir_flist->files + dstart,
2533                                (dir_flist->used - dstart) * sizeof (struct file_struct*));
2534                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2535                 }
2536         } else {
2537                 flist->sorted = flist->files;
2538                 if (inc_recurse && dir_flist->used > dstart) {
2539                         dir_flist->sorted = dir_flist->files;
2540                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2541                 }
2542         }
2543
2544         if (inc_recurse)
2545                 flist_done_allocating(flist);
2546         else if (f >= 0) {
2547                 recv_id_list(f, flist);
2548                 flist_eof = 1;
2549                 if (DEBUG_GTE(FLIST, 3))
2550                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2551         }
2552
2553         flist_sort_and_clean(flist, relative_paths);
2554
2555         if (protocol_version < 30) {
2556                 /* Recv the io_error flag */
2557                 int err = read_int(f);
2558                 if (!ignore_errors)
2559                         io_error |= err;
2560         } else if (inc_recurse && flist->ndx_start == 1) {
2561                 if (!file_total || strcmp(flist->sorted[flist->low]->basename, ".") != 0)
2562                         flist->parent_ndx = -1;
2563         }
2564
2565         if (DEBUG_GTE(FLIST, 3))
2566                 output_flist(flist);
2567
2568         if (DEBUG_GTE(FLIST, 2))
2569                 rprintf(FINFO, "recv_file_list done\n");
2570
2571         stats.flist_size += stats.total_read - start_read;
2572         stats.num_files += flist->used;
2573
2574         return flist;
2575 }
2576
2577 /* This is only used once by the receiver if the very first file-list
2578  * has exactly one item in it. */
2579 void recv_additional_file_list(int f)
2580 {
2581         struct file_list *flist;
2582         int ndx = read_ndx(f);
2583         if (ndx == NDX_FLIST_EOF) {
2584                 flist_eof = 1;
2585                 if (DEBUG_GTE(FLIST, 3))
2586                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2587                 change_local_filter_dir(NULL, 0, 0);
2588         } else {
2589                 ndx = NDX_FLIST_OFFSET - ndx;
2590                 if (ndx < 0 || ndx >= dir_flist->used) {
2591                         ndx = NDX_FLIST_OFFSET - ndx;
2592                         rprintf(FERROR,
2593                                 "[%s] Invalid dir index: %d (%d - %d)\n",
2594                                 who_am_i(), ndx, NDX_FLIST_OFFSET,
2595                                 NDX_FLIST_OFFSET - dir_flist->used + 1);
2596                         exit_cleanup(RERR_PROTOCOL);
2597                 }
2598                 if (DEBUG_GTE(FLIST, 3)) {
2599                         rprintf(FINFO, "[%s] receiving flist for dir %d\n",
2600                                 who_am_i(), ndx);
2601                 }
2602                 flist = recv_file_list(f);
2603                 flist->parent_ndx = ndx;
2604         }
2605 }
2606
2607 /* Search for an identically-named item in the file list.  Note that the
2608  * items must agree in their directory-ness, or no match is returned. */
2609 int flist_find(struct file_list *flist, struct file_struct *f)
2610 {
2611         int low = flist->low, high = flist->high;
2612         int diff, mid, mid_up;
2613
2614         while (low <= high) {
2615                 mid = (low + high) / 2;
2616                 if (F_IS_ACTIVE(flist->sorted[mid]))
2617                         mid_up = mid;
2618                 else {
2619                         /* Scan for the next non-empty entry using the cached
2620                          * distance values.  If the value isn't fully up-to-
2621                          * date, update it. */
2622                         mid_up = mid + F_DEPTH(flist->sorted[mid]);
2623                         if (!F_IS_ACTIVE(flist->sorted[mid_up])) {
2624                                 do {
2625                                     mid_up += F_DEPTH(flist->sorted[mid_up]);
2626                                 } while (!F_IS_ACTIVE(flist->sorted[mid_up]));
2627                                 F_DEPTH(flist->sorted[mid]) = mid_up - mid;
2628                         }
2629                         if (mid_up > high) {
2630                                 /* If there's nothing left above us, set high to
2631                                  * a non-empty entry below us and continue. */
2632                                 high = mid - (int)flist->sorted[mid]->len32;
2633                                 if (!F_IS_ACTIVE(flist->sorted[high])) {
2634                                         do {
2635                                             high -= (int)flist->sorted[high]->len32;
2636                                         } while (!F_IS_ACTIVE(flist->sorted[high]));
2637                                         flist->sorted[mid]->len32 = mid - high;
2638                                 }
2639                                 continue;
2640                         }
2641                 }
2642                 diff = f_name_cmp(flist->sorted[mid_up], f);
2643                 if (diff == 0) {
2644                         if (protocol_version < 29
2645                             && S_ISDIR(flist->sorted[mid_up]->mode)
2646                             != S_ISDIR(f->mode))
2647                                 return -1;
2648                         return mid_up;
2649                 }
2650                 if (diff < 0)
2651                         low = mid_up + 1;
2652                 else
2653                         high = mid - 1;
2654         }
2655         return -1;
2656 }
2657
2658 /* Search for an identically-named item in the file list.  Differs from
2659  * flist_find in that an item that agrees with "f" in directory-ness is
2660  * preferred but one that does not is still found. */
2661 int flist_find_ignore_dirness(struct file_list *flist, struct file_struct *f)
2662 {
2663         mode_t save_mode;
2664         int ndx;
2665
2666         /* First look for an item that agrees in directory-ness. */
2667         ndx = flist_find(flist, f);
2668         if (ndx >= 0)
2669                 return ndx;
2670
2671         /* Temporarily flip f->mode to look for an item of opposite
2672          * directory-ness. */
2673         save_mode = f->mode;
2674         f->mode = S_ISDIR(f->mode) ? S_IFREG : S_IFDIR;
2675         ndx = flist_find(flist, f);
2676         f->mode = save_mode;
2677         return ndx;
2678 }
2679
2680 /*
2681  * Free up any resources a file_struct has allocated
2682  * and clear the file.
2683  */
2684 void clear_file(struct file_struct *file)
2685 {
2686         /* The +1 zeros out the first char of the basename. */
2687         memset(file, 0, FILE_STRUCT_LEN + 1);
2688         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
2689          * entry.  Likewise for len32 in the opposite direction.  We assume
2690          * that we're alone for now since flist_find() will adjust the counts
2691          * it runs into that aren't up-to-date. */
2692         file->len32 = F_DEPTH(file) = 1;
2693 }
2694
2695 /* Allocate a new file list. */
2696 struct file_list *flist_new(int flags, char *msg)
2697 {
2698         struct file_list *flist;
2699
2700         if (!(flist = new0(struct file_list)))
2701                 out_of_memory(msg);
2702
2703         if (flags & FLIST_TEMP) {
2704                 if (!(flist->file_pool = pool_create(SMALL_EXTENT, 0,
2705                                                      out_of_memory,
2706                                                      POOL_INTERN)))
2707                         out_of_memory(msg);
2708         } else {
2709                 /* This is a doubly linked list with prev looping back to
2710                  * the end of the list, but the last next pointer is NULL. */
2711                 if (!first_flist) {
2712                         flist->file_pool = pool_create(NORMAL_EXTENT, 0,
2713                                                        out_of_memory,
2714                                                        POOL_INTERN);
2715                         if (!flist->file_pool)
2716                                 out_of_memory(msg);
2717
2718                         flist->ndx_start = flist->flist_num = inc_recurse ? 1 : 0;
2719
2720                         first_flist = cur_flist = flist->prev = flist;
2721                 } else {
2722                         struct file_list *prev = first_flist->prev;
2723
2724                         flist->file_pool = first_flist->file_pool;
2725
2726                         flist->ndx_start = prev->ndx_start + prev->used + 1;
2727                         flist->flist_num = prev->flist_num + 1;
2728
2729                         flist->prev = prev;
2730                         prev->next = first_flist->prev = flist;
2731                 }
2732                 flist->pool_boundary = pool_boundary(flist->file_pool, 0);
2733                 flist_cnt++;
2734         }
2735
2736         return flist;
2737 }
2738
2739 /* Free up all elements in a flist. */
2740 void flist_free(struct file_list *flist)
2741 {
2742         if (!flist->prev) {
2743                 /* Was FLIST_TEMP dir-list. */
2744         } else if (flist == flist->prev) {
2745                 first_flist = cur_flist = NULL;
2746                 file_total = 0;
2747                 flist_cnt = 0;
2748         } else {
2749                 if (flist == cur_flist)
2750                         cur_flist = flist->next;
2751                 if (flist == first_flist)
2752                         first_flist = first_flist->next;
2753                 else {
2754                         flist->prev->next = flist->next;
2755                         if (!flist->next)
2756                                 flist->next = first_flist;
2757                 }
2758                 flist->next->prev = flist->prev;
2759                 file_total -= flist->used;
2760                 flist_cnt--;
2761         }
2762
2763         if (!flist->prev || !flist_cnt)
2764                 pool_destroy(flist->file_pool);
2765         else
2766                 pool_free_old(flist->file_pool, flist->pool_boundary);
2767
2768         if (flist->sorted && flist->sorted != flist->files)
2769                 free(flist->sorted);
2770         free(flist->files);
2771         free(flist);
2772 }
2773
2774 /* This routine ensures we don't have any duplicate names in our file list.
2775  * duplicate names can cause corruption because of the pipelining. */
2776 static void flist_sort_and_clean(struct file_list *flist, int strip_root)
2777 {
2778         char fbuf[MAXPATHLEN];
2779         int i, prev_i;
2780
2781         if (!flist)
2782                 return;
2783         if (flist->used == 0) {
2784                 flist->high = -1;
2785                 flist->low = 0;
2786                 return;
2787         }
2788
2789         fsort(flist->sorted, flist->used);
2790
2791         if (!am_sender || inc_recurse) {
2792                 for (i = prev_i = 0; i < flist->used; i++) {
2793                         if (F_IS_ACTIVE(flist->sorted[i])) {
2794                                 prev_i = i;
2795                                 break;
2796                         }
2797                 }
2798                 flist->low = prev_i;
2799         } else {
2800                 i = prev_i = flist->used - 1;
2801                 flist->low = 0;
2802         }
2803
2804         while (++i < flist->used) {
2805                 int j;
2806                 struct file_struct *file = flist->sorted[i];
2807
2808                 if (!F_IS_ACTIVE(file))
2809                         continue;
2810                 if (f_name_cmp(file, flist->sorted[prev_i]) == 0)
2811                         j = prev_i;
2812                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
2813                         int save_mode = file->mode;
2814                         /* Make sure that this directory doesn't duplicate a
2815                          * non-directory earlier in the list. */
2816                         flist->high = prev_i;
2817                         file->mode = S_IFREG;
2818                         j = flist_find(flist, file);
2819                         file->mode = save_mode;
2820                 } else
2821                         j = -1;
2822                 if (j >= 0) {
2823                         int keep, drop;
2824                         /* If one is a dir and the other is not, we want to
2825                          * keep the dir because it might have contents in the
2826                          * list.  Otherwise keep the first one. */
2827                         if (S_ISDIR(file->mode)) {
2828                                 struct file_struct *fp = flist->sorted[j];
2829                                 if (!S_ISDIR(fp->mode))
2830                                         keep = i, drop = j;
2831                                 else {
2832                                         if (am_sender)
2833                                                 file->flags |= FLAG_DUPLICATE;
2834                                         else { /* Make sure we merge our vital flags. */
2835                                                 fp->flags |= file->flags & (FLAG_TOP_DIR|FLAG_CONTENT_DIR);
2836                                                 fp->flags &= file->flags | ~FLAG_IMPLIED_DIR;
2837                                         }
2838                                         keep = j, drop = i;
2839                                 }
2840                         } else
2841                                 keep = j, drop = i;
2842
2843                         if (!am_sender) {
2844                                 if (DEBUG_GTE(DUP, 1)) {
2845                                         rprintf(FINFO,
2846                                             "removing duplicate name %s from file list (%d)\n",
2847                                             f_name(file, fbuf), drop + flist->ndx_start);
2848                                 }
2849                                 clear_file(flist->sorted[drop]);
2850                         }
2851
2852                         if (keep == i) {
2853                                 if (flist->low == drop) {
2854                                         for (j = drop + 1;
2855                                              j < i && !F_IS_ACTIVE(flist->sorted[j]);
2856                                              j++) {}
2857                                         flist->low = j;
2858                                 }
2859                                 prev_i = i;
2860                         }
2861                 } else
2862                         prev_i = i;
2863         }
2864         flist->high = prev_i;
2865
2866         if (strip_root) {
2867                 /* We need to strip off the leading slashes for relative
2868                  * paths, but this must be done _after_ the sorting phase. */
2869                 for (i = flist->low; i <= flist->high; i++) {
2870                         struct file_struct *file = flist->sorted[i];
2871
2872                         if (!file->dirname)
2873                                 continue;
2874                         while (*file->dirname == '/')
2875                                 file->dirname++;
2876                         if (!*file->dirname)
2877                                 file->dirname = NULL;
2878                 }
2879         }
2880
2881         if (prune_empty_dirs && !am_sender) {
2882                 int j, prev_depth = 0;
2883
2884                 prev_i = 0; /* It's OK that this isn't really true. */
2885
2886                 for (i = flist->low; i <= flist->high; i++) {
2887                         struct file_struct *fp, *file = flist->sorted[i];
2888
2889                         /* This temporarily abuses the F_DEPTH() value for a
2890                          * directory that is in a chain that might get pruned.
2891                          * We restore the old value if it gets a reprieve. */
2892                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2893                                 /* Dump empty dirs when coming back down. */
2894                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2895                                         fp = flist->sorted[prev_i];
2896                                         if (F_DEPTH(fp) >= 0)
2897                                                 break;
2898                                         prev_i = -F_DEPTH(fp)-1;
2899                                         clear_file(fp);
2900                                 }
2901                                 prev_depth = F_DEPTH(file);
2902                                 if (is_excluded(f_name(file, fbuf), 1,
2903                                                        ALL_FILTERS)) {
2904                                         /* Keep dirs through this dir. */
2905                                         for (j = prev_depth-1; ; j--) {
2906                                                 fp = flist->sorted[prev_i];
2907                                                 if (F_DEPTH(fp) >= 0)
2908                                                         break;
2909                                                 prev_i = -F_DEPTH(fp)-1;
2910                                                 F_DEPTH(fp) = j;
2911                                         }
2912                                 } else
2913                                         F_DEPTH(file) = -prev_i-1;
2914                                 prev_i = i;
2915                         } else {
2916                                 /* Keep dirs through this non-dir. */
2917                                 for (j = prev_depth; ; j--) {
2918                                         fp = flist->sorted[prev_i];
2919                                         if (F_DEPTH(fp) >= 0)
2920                                                 break;
2921                                         prev_i = -F_DEPTH(fp)-1;
2922                                         F_DEPTH(fp) = j;
2923                                 }
2924                         }
2925                 }
2926                 /* Dump all remaining empty dirs. */
2927                 while (1) {
2928                         struct file_struct *fp = flist->sorted[prev_i];
2929                         if (F_DEPTH(fp) >= 0)
2930                                 break;
2931                         prev_i = -F_DEPTH(fp)-1;
2932                         clear_file(fp);
2933                 }
2934
2935                 for (i = flist->low; i <= flist->high; i++) {
2936                         if (F_IS_ACTIVE(flist->sorted[i]))
2937                                 break;
2938                 }
2939                 flist->low = i;
2940                 for (i = flist->high; i >= flist->low; i--) {
2941                         if (F_IS_ACTIVE(flist->sorted[i]))
2942                                 break;
2943                 }
2944                 flist->high = i;
2945         }
2946 }
2947
2948 static void output_flist(struct file_list *flist)
2949 {
2950         char uidbuf[16], gidbuf[16], depthbuf[16];
2951         struct file_struct *file;
2952         const char *root, *dir, *slash, *name, *trail;
2953         const char *who = who_am_i();
2954         int i;
2955
2956         rprintf(FINFO, "[%s] flist start=%d, used=%d, low=%d, high=%d\n",
2957                 who, flist->ndx_start, flist->used, flist->low, flist->high);
2958         for (i = 0; i < flist->used; i++) {
2959                 file = flist->files[i];
2960                 if ((am_root || am_sender) && uid_ndx) {
2961                         snprintf(uidbuf, sizeof uidbuf, " uid=%u",
2962                                  F_OWNER(file));
2963                 } else
2964                         *uidbuf = '\0';
2965                 if (gid_ndx) {
2966                         static char parens[] = "(\0)\0\0\0";
2967                         char *pp = parens + (file->flags & FLAG_SKIP_GROUP ? 0 : 3);
2968                         snprintf(gidbuf, sizeof gidbuf, " gid=%s%u%s",
2969                                  pp, F_GROUP(file), pp + 2);
2970                 } else
2971                         *gidbuf = '\0';
2972                 if (!am_sender)
2973                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2974                 if (F_IS_ACTIVE(file)) {
2975                         root = am_sender ? NS(F_PATHNAME(file)) : depthbuf;
2976                         if ((dir = file->dirname) == NULL)
2977                                 dir = slash = "";
2978                         else
2979                                 slash = "/";
2980                         name = file->basename;
2981                         trail = S_ISDIR(file->mode) ? "/" : "";
2982                 } else
2983                         root = dir = slash = name = trail = "";
2984                 rprintf(FINFO,
2985                         "[%s] i=%d %s %s%s%s%s mode=0%o len=%s%s%s flags=%x\n",
2986                         who, i + flist->ndx_start,
2987                         root, dir, slash, name, trail,
2988                         (int)file->mode, comma_num(F_LENGTH(file)),
2989                         uidbuf, gidbuf, file->flags);
2990         }
2991 }
2992
2993 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2994 enum fnc_type { t_PATH, t_ITEM };
2995
2996 static int found_prefix;
2997
2998 /* Compare the names of two file_struct entities, similar to how strcmp()
2999  * would do if it were operating on the joined strings.
3000  *
3001  * Some differences beginning with protocol_version 29: (1) directory names
3002  * are compared with an assumed trailing slash so that they compare in a
3003  * way that would cause them to sort immediately prior to any content they
3004  * may have; (2) a directory of any name compares after a non-directory of
3005  * any name at the same depth; (3) a directory with name "." compares prior
3006  * to anything else.  These changes mean that a directory and a non-dir
3007  * with the same name will not compare as equal (protocol_version >= 29).
3008  *
3009  * The dirname component can be an empty string, but the basename component
3010  * cannot (and never is in the current codebase).  The basename component
3011  * may be NULL (for a removed item), in which case it is considered to be
3012  * after any existing item. */
3013 int f_name_cmp(const struct file_struct *f1, const struct file_struct *f2)
3014 {
3015         int dif;
3016         const uchar *c1, *c2;
3017         enum fnc_state state1, state2;
3018         enum fnc_type type1, type2;
3019         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
3020
3021         if (!f1 || !F_IS_ACTIVE(f1)) {
3022                 if (!f2 || !F_IS_ACTIVE(f2))
3023                         return 0;
3024                 return -1;
3025         }
3026         if (!f2 || !F_IS_ACTIVE(f2))
3027                 return 1;
3028
3029         c1 = (uchar*)f1->dirname;
3030         c2 = (uchar*)f2->dirname;
3031         if (c1 == c2)
3032                 c1 = c2 = NULL;
3033         if (!c1) {
3034                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
3035                 c1 = (const uchar*)f1->basename;
3036                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
3037                         type1 = t_ITEM;
3038                         state1 = s_TRAILING;
3039                         c1 = (uchar*)"";
3040                 } else
3041                         state1 = s_BASE;
3042         } else {
3043                 type1 = t_path;
3044                 state1 = s_DIR;
3045         }
3046         if (!c2) {
3047                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
3048                 c2 = (const uchar*)f2->basename;
3049                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
3050                         type2 = t_ITEM;
3051                         state2 = s_TRAILING;
3052                         c2 = (uchar*)"";
3053                 } else
3054                         state2 = s_BASE;
3055         } else {
3056                 type2 = t_path;
3057                 state2 = s_DIR;
3058         }
3059
3060         if (type1 != type2)
3061                 return type1 == t_PATH ? 1 : -1;
3062
3063         do {
3064                 if (!*c1) {
3065                         switch (state1) {
3066                         case s_DIR:
3067                                 state1 = s_SLASH;
3068                                 c1 = (uchar*)"/";
3069                                 break;
3070                         case s_SLASH:
3071                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
3072                                 c1 = (const uchar*)f1->basename;
3073                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
3074                                         type1 = t_ITEM;
3075                                         state1 = s_TRAILING;
3076                                         c1 = (uchar*)"";
3077                                 } else
3078                                         state1 = s_BASE;
3079                                 break;
3080                         case s_BASE:
3081                                 state1 = s_TRAILING;
3082                                 if (type1 == t_PATH) {
3083                                         c1 = (uchar*)"/";
3084                                         break;
3085                                 }
3086                                 /* FALL THROUGH */
3087                         case s_TRAILING:
3088                                 type1 = t_ITEM;
3089                                 break;
3090                         }
3091                         if (*c2 && type1 != type2)
3092                                 return type1 == t_PATH ? 1 : -1;
3093                 }
3094                 if (!*c2) {
3095                         switch (state2) {
3096                         case s_DIR:
3097                                 state2 = s_SLASH;
3098                                 c2 = (uchar*)"/";
3099                                 break;
3100                         case s_SLASH:
3101                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
3102                                 c2 = (const uchar*)f2->basename;
3103                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
3104                                         type2 = t_ITEM;
3105                                         state2 = s_TRAILING;
3106                                         c2 = (uchar*)"";
3107                                 } else
3108                                         state2 = s_BASE;
3109                                 break;
3110                         case s_BASE:
3111                                 state2 = s_TRAILING;
3112                                 if (type2 == t_PATH) {
3113                                         c2 = (uchar*)"/";
3114                                         break;
3115                                 }
3116                                 /* FALL THROUGH */
3117                         case s_TRAILING:
3118                                 found_prefix = 1;
3119                                 if (!*c1)
3120                                         return 0;
3121                                 type2 = t_ITEM;
3122                                 break;
3123                         }
3124                         if (type1 != type2)
3125                                 return type1 == t_PATH ? 1 : -1;
3126                 }
3127         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
3128
3129         return dif;
3130 }
3131
3132 /* Returns 1 if f1's filename has all of f2's filename as a prefix.  This does
3133  * not match if f2's basename is not an exact match of a path element in f1.
3134  * E.g. /path/foo is not a prefix of /path/foobar/baz, but /path/foobar is. */
3135 int f_name_has_prefix(const struct file_struct *f1, const struct file_struct *f2)
3136 {
3137         found_prefix = 0;
3138         f_name_cmp(f1, f2);
3139         return found_prefix;
3140 }
3141
3142 char *f_name_buf(void)
3143 {
3144         static char names[5][MAXPATHLEN];
3145         static unsigned int n;
3146
3147         n = (n + 1) % (sizeof names / sizeof names[0]);
3148
3149         return names[n];
3150 }
3151
3152 /* Return a copy of the full filename of a flist entry, using the indicated
3153  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
3154  * done because we checked the size when creating the file_struct entry.
3155  */
3156 char *f_name(const struct file_struct *f, char *fbuf)
3157 {
3158         if (!f || !F_IS_ACTIVE(f))
3159                 return NULL;
3160
3161         if (!fbuf)
3162                 fbuf = f_name_buf();
3163
3164         if (f->dirname) {
3165                 int len = strlen(f->dirname);
3166                 memcpy(fbuf, f->dirname, len);
3167                 fbuf[len] = '/';
3168                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
3169         } else
3170                 strlcpy(fbuf, f->basename, MAXPATHLEN);
3171
3172         return fbuf;
3173 }
3174
3175 /* Do a non-recursive scan of the named directory, possibly ignoring all
3176  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
3177  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
3178  * buffer (the functions we call will append names onto the end, but the old
3179  * dir value will be restored on exit). */
3180 struct file_list *get_dirlist(char *dirname, int dlen, int ignore_filter_rules)
3181 {
3182         struct file_list *dirlist;
3183         char dirbuf[MAXPATHLEN];
3184         int save_recurse = recurse;
3185         int save_xfer_dirs = xfer_dirs;
3186         int save_prune_empty_dirs = prune_empty_dirs;
3187
3188         if (dlen < 0) {
3189                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
3190                 if (dlen >= MAXPATHLEN)
3191                         return NULL;
3192                 dirname = dirbuf;
3193         }
3194
3195         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
3196
3197         recurse = 0;
3198         xfer_dirs = 1;
3199         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen, FLAG_CONTENT_DIR);
3200         xfer_dirs = save_xfer_dirs;
3201         recurse = save_recurse;
3202         if (INFO_GTE(PROGRESS, 1))
3203                 flist_count_offset += dirlist->used;
3204
3205         prune_empty_dirs = 0;
3206         dirlist->sorted = dirlist->files;
3207         flist_sort_and_clean(dirlist, 0);
3208         prune_empty_dirs = save_prune_empty_dirs;
3209
3210         if (DEBUG_GTE(FLIST, 3))
3211                 output_flist(dirlist);
3212
3213         return dirlist;
3214 }