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) 2002-2020 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 checksum_type;
  37 extern int module_id;
  38 extern int ignore_errors;
  39 extern int numeric_ids;
  40 extern int quiet;
  41 extern int recurse;
  42 extern int use_qsort;
  43 extern int xfer_dirs;
  44 extern int filesfrom_fd;
  45 extern int one_file_system;
  46 extern int copy_dirlinks;
  47 extern int preserve_uid;
  48 extern int preserve_gid;
  49 extern int preserve_acls;
  50 extern int preserve_xattrs;
  51 extern int preserve_links;
  52 extern int preserve_hard_links;
  53 extern int preserve_devices;
  54 extern int preserve_specials;
  55 extern int delete_during;
  56 extern int missing_args;
  57 extern int eol_nulls;
  58 extern int atimes_ndx;
  59 extern int relative_paths;
  60 extern int implied_dirs;
  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 uid_t our_uid;
  76 extern struct stats stats;
  77 extern char *filesfrom_host;
  78 extern char *usermap, *groupmap;
  79
  80 extern char curr_dir[MAXPATHLEN];
  81
  82 extern struct chmod_mode_struct *chmod_modes;
  83
  84 extern filter_rule_list filter_list;
  85 extern filter_rule_list daemon_filter_list;
  86
  87 #ifdef ICONV_OPTION
  88 extern int filesfrom_convert;
  89 extern iconv_t ic_send, ic_recv;
  90 #endif
  91
  92 #define PTR_SIZE (sizeof (struct file_struct *))
  93
  94 int io_error;
  95 int flist_csum_len;
  96 dev_t filesystem_dev; /* used to implement -x */
  97
  98 struct file_list *cur_flist, *first_flist, *dir_flist;
  99 int send_dir_ndx = -1, send_dir_depth = -1;
 100 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
 101 int file_total = 0; /* total of all active items over all file-lists */
 102 int file_old_total = 0; /* total of active items that will soon be gone */
 103 int flist_eof = 0; /* all the file-lists are now known */
 104
 105 #define NORMAL_NAME 0
 106 #define SLASH_ENDING_NAME 1
 107 #define DOTDIR_NAME 2
 108 #define MISSING_NAME 3
 109
 110 /* Starting from protocol version 26, we always use 64-bit ino_t and dev_t
 111  * internally, even if this platform does not allow files to have 64-bit inums.
 112  * The only exception is if we're on a platform with no 64-bit type at all.
 113  *
 114  * Because we use read_longint() to get these off the wire, if you transfer
 115  * devices or (for protocols < 30) hardlinks with dev or inum > 2**32 to a
 116  * machine with no 64-bit types then you will get an overflow error.
 117  *
 118  * Note that if you transfer devices from a 64-bit-devt machine (say, Solaris)
 119  * to a 32-bit-devt machine (say, Linux-2.2/x86) then the device numbers will
 120  * be truncated.  But it's a kind of silly thing to do anyhow. */
 121
 122 /* The tmp_* vars are used as a cache area by make_file() to store data
 123  * that the sender doesn't need to remember in its file list.  The data
 124  * will survive just long enough to be used by send_file_entry(). */
 125 static dev_t tmp_rdev;
 126 #ifdef SUPPORT_HARD_LINKS
 127 static int64 tmp_dev = -1, tmp_ino;
 128 #endif
 129 static char tmp_sum[MAX_DIGEST_LEN];
 130
 131 static char empty_sum[MAX_DIGEST_LEN];
 132 static int flist_count_offset; /* for --delete --progress */
 133 static int show_filelist_progress;
 134
 135 static void flist_sort_and_clean(struct file_list *flist, int strip_root);
 136 static void output_flist(struct file_list *flist);
 137
 138 void init_flist(void)
 139 {
 140         if (DEBUG_GTE(FLIST, 4)) {
 141                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
 142                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
 143         }
 144         parse_checksum_choice(); /* Sets checksum_type && xfersum_type */
 145         flist_csum_len = csum_len_for_type(checksum_type, 1);
 146
 147         show_filelist_progress = INFO_GTE(FLIST, 1) && xfer_dirs && !am_server && !inc_recurse;
 148 }
 149
 150 static void start_filelist_progress(char *kind)
 151 {
 152         if (quiet)
 153                 return;
 154         rprintf(FCLIENT, "%s ... ", kind);
 155         output_needs_newline = 1;
 156         rflush(FINFO);
 157 }
 158
 159 static void emit_filelist_progress(int count)
 160 {
 161         if (quiet)
 162                 return;
 163         if (output_needs_newline == 2) /* avoid a newline in the middle of this filelist-progress output */
 164                 output_needs_newline = 0;
 165         rprintf(FCLIENT, " %d files...\r", count);
 166         output_needs_newline = 2;
 167 }
 168
 169 static void maybe_emit_filelist_progress(int count)
 170 {
 171         if (INFO_GTE(FLIST, 2) && show_filelist_progress && (count % 100) == 0)
 172                 emit_filelist_progress(count);
 173 }
 174
 175 static void finish_filelist_progress(const struct file_list *flist)
 176 {
 177         output_needs_newline = 0;
 178         if (INFO_GTE(FLIST, 2)) {
 179                 /* This overwrites the progress line */
 180                 rprintf(FINFO, "%d file%sto consider\n",
 181                         flist->used, flist->used == 1 ? " " : "s ");
 182         } else {
 183                 rprintf(FINFO, "done\n");
 184         }
 185 }
 186
 187 void show_flist_stats(void)
 188 {
 189         /* Nothing yet */
 190 }
 191
 192 /* Stat either a symlink or its referent, depending on the settings of
 193  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 194  *
 195  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 196  * MAXPATHLEN chars) will be set to the symlink's target string.
 197  *
 198  * The stat structure pointed to by stp will contain information about the
 199  * link or the referent as appropriate, if they exist. */
 200 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 201 {
 202 #ifdef SUPPORT_LINKS
 203         if (link_stat(path, stp, copy_dirlinks) < 0)
 204                 return -1;
 205         if (S_ISLNK(stp->st_mode)) {
 206                 int llen = do_readlink(path, linkbuf, MAXPATHLEN - 1);
 207                 if (llen < 0)
 208                         return -1;
 209                 linkbuf[llen] = '\0';
 210                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 211                         if (INFO_GTE(SYMSAFE, 1)) {
 212                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 213                                         path, linkbuf);
 214                         }
 215                         return x_stat(path, stp, NULL);
 216                 }
 217                 if (munge_symlinks && am_sender && llen > SYMLINK_PREFIX_LEN
 218                  && strncmp(linkbuf, SYMLINK_PREFIX, SYMLINK_PREFIX_LEN) == 0) {
 219                         memmove(linkbuf, linkbuf + SYMLINK_PREFIX_LEN,
 220                                 llen - SYMLINK_PREFIX_LEN + 1);
 221                 }
 222         }
 223         return 0;
 224 #else
 225         return x_stat(path, stp, NULL);
 226 #endif
 227 }
 228
 229 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 230 {
 231 #ifdef SUPPORT_LINKS
 232         if (copy_links)
 233                 return x_stat(path, stp, NULL);
 234         if (x_lstat(path, stp, NULL) < 0)
 235                 return -1;
 236         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 237                 STRUCT_STAT st;
 238                 if (x_stat(path, &st, NULL) == 0 && S_ISDIR(st.st_mode))
 239                         *stp = st;
 240         }
 241         return 0;
 242 #else
 243         return x_stat(path, stp, NULL);
 244 #endif
 245 }
 246
 247 static inline int path_is_daemon_excluded(char *path, int ignore_filename)
 248 {
 249         if (daemon_filter_list.head) {
 250                 char *slash = path;
 251
 252                 while ((slash = strchr(slash+1, '/')) != NULL) {
 253                         int ret;
 254                         *slash = '\0';
 255                         ret = check_filter(&daemon_filter_list, FLOG, path, 1);
 256                         *slash = '/';
 257                         if (ret < 0) {
 258                                 errno = ENOENT;
 259                                 return 1;
 260                         }
 261                 }
 262
 263                 if (!ignore_filename
 264                  && check_filter(&daemon_filter_list, FLOG, path, 1) < 0) {
 265                         errno = ENOENT;
 266                         return 1;
 267                 }
 268         }
 269
 270         return 0;
 271 }
 272
 273 static inline int is_excluded(const char *fname, int is_dir, int filter_level)
 274 {
 275         return name_is_excluded(fname, is_dir ? NAME_IS_DIR : NAME_IS_FILE, filter_level);
 276 }
 277
 278 static void send_directory(int f, struct file_list *flist,
 279                            char *fbuf, int len, int flags);
 280
 281 static const char *pathname, *orig_dir;
 282 static int pathname_len;
 283
 284 /* Make sure flist can hold at least flist->used + extra entries. */
 285 static void flist_expand(struct file_list *flist, int extra)
 286 {
 287         struct file_struct **new_ptr;
 288
 289         if (flist->used + extra <= flist->malloced)
 290                 return;
 291
 292         if (flist->malloced < FLIST_START)
 293                 flist->malloced = FLIST_START;
 294         else if (flist->malloced >= FLIST_LINEAR)
 295                 flist->malloced += FLIST_LINEAR;
 296         else
 297                 flist->malloced *= 2;
 298
 299         /* In case count jumped or we are starting the list
 300          * with a known size just set it. */
 301         if (flist->malloced < flist->used + extra)
 302                 flist->malloced = flist->used + extra;
 303
 304         new_ptr = realloc_array(flist->files, struct file_struct *,
 305                                 flist->malloced);
 306
 307         if (DEBUG_GTE(FLIST, 1) && flist->malloced != FLIST_START) {
 308                 rprintf(FCLIENT, "[%s] expand file_list pointer array to %s bytes, did%s move\n",
 309                     who_am_i(),
 310                     big_num(sizeof flist->files[0] * flist->malloced),
 311                     (new_ptr == flist->files) ? " not" : "");
 312         }
 313
 314         flist->files = new_ptr;
 315
 316         if (!flist->files)
 317                 out_of_memory("flist_expand");
 318 }
 319
 320 static void flist_done_allocating(struct file_list *flist)
 321 {
 322         void *ptr = pool_boundary(flist->file_pool, 8*1024);
 323         if (flist->pool_boundary == ptr)
 324                 flist->pool_boundary = NULL; /* list didn't use any pool memory */
 325         else
 326                 flist->pool_boundary = ptr;
 327 }
 328
 329 /* Call this with EITHER (1) "file, NULL, 0" to chdir() to the file's
 330  * F_PATHNAME(), or (2) "NULL, dir, dirlen" to chdir() to the supplied dir,
 331  * with dir == NULL taken to be the starting directory, and dirlen < 0
 332  * indicating that strdup(dir) should be called and then the -dirlen length
 333  * value checked to ensure that it is not daemon-excluded. */
 334 int change_pathname(struct file_struct *file, const char *dir, int dirlen)
 335 {
 336         if (dirlen < 0) {
 337                 char *cpy = strdup(dir);
 338                 if (*cpy != '/')
 339                         change_dir(orig_dir, CD_SKIP_CHDIR);
 340                 if (path_is_daemon_excluded(cpy, 0))
 341                         goto chdir_error;
 342                 dir = cpy;
 343                 dirlen = -dirlen;
 344         } else {
 345                 if (file) {
 346                         if (pathname == F_PATHNAME(file))
 347                                 return 1;
 348                         dir = F_PATHNAME(file);
 349                         if (dir)
 350                                 dirlen = strlen(dir);
 351                 } else if (pathname == dir)
 352                         return 1;
 353                 if (dir && *dir != '/')
 354                         change_dir(orig_dir, CD_SKIP_CHDIR);
 355         }
 356
 357         pathname = dir;
 358         pathname_len = dirlen;
 359
 360         if (!dir)
 361                 dir = orig_dir;
 362
 363         if (!change_dir(dir, CD_NORMAL)) {
 364           chdir_error:
 365                 io_error |= IOERR_GENERAL;
 366                 rsyserr(FERROR_XFER, errno, "change_dir %s failed", full_fname(dir));
 367                 if (dir != orig_dir)
 368                         change_dir(orig_dir, CD_NORMAL);
 369                 pathname = NULL;
 370                 pathname_len = 0;
 371                 return 0;
 372         }
 373
 374         return 1;
 375 }
 376
 377 static void send_file_entry(int f, const char *fname, struct file_struct *file,
 378 #ifdef SUPPORT_LINKS
 379                             const char *symlink_name, int symlink_len,
 380 #endif
 381                             int ndx, int first_ndx)
 382 {
 383         static time_t modtime, atime;
 384         static mode_t mode;
 385 #ifdef SUPPORT_HARD_LINKS
 386         static int64 dev;
 387 #endif
 388         static dev_t rdev;
 389         static uint32 rdev_major;
 390         static uid_t uid;
 391         static gid_t gid;
 392         static const char *user_name, *group_name;
 393         static char lastname[MAXPATHLEN];
 394 #ifdef SUPPORT_HARD_LINKS
 395         int first_hlink_ndx = -1;
 396 #endif
 397         int l1, l2;
 398         int xflags;
 399
 400         /* Initialize starting value of xflags and adjust counts. */
 401         if (S_ISREG(file->mode))
 402                 xflags = 0;
 403         else if (S_ISDIR(file->mode)) {
 404                 stats.num_dirs++;
 405                 if (protocol_version >= 30) {
 406                         if (file->flags & FLAG_CONTENT_DIR)
 407                                 xflags = file->flags & FLAG_TOP_DIR;
 408                         else if (file->flags & FLAG_IMPLIED_DIR)
 409                                 xflags = XMIT_TOP_DIR | XMIT_NO_CONTENT_DIR;
 410                         else
 411                                 xflags = XMIT_NO_CONTENT_DIR;
 412                 } else
 413                         xflags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 414         } else {
 415                 if (S_ISLNK(file->mode))
 416                         stats.num_symlinks++;
 417                 else if (IS_DEVICE(file->mode))
 418                         stats.num_devices++;
 419                 else if (IS_SPECIAL(file->mode))
 420                         stats.num_specials++;
 421                 xflags = 0;
 422         }
 423
 424         if (file->mode == mode)
 425                 xflags |= XMIT_SAME_MODE;
 426         else
 427                 mode = file->mode;
 428
 429         if (preserve_devices && IS_DEVICE(mode)) {
 430                 if (protocol_version < 28) {
 431                         if (tmp_rdev == rdev)
 432                                 xflags |= XMIT_SAME_RDEV_pre28;
 433                         else
 434                                 rdev = tmp_rdev;
 435                 } else {
 436                         rdev = tmp_rdev;
 437                         if ((uint32)major(rdev) == rdev_major)
 438                                 xflags |= XMIT_SAME_RDEV_MAJOR;
 439                         else
 440                                 rdev_major = major(rdev);
 441                         if (protocol_version < 30 && (uint32)minor(rdev) <= 0xFFu)
 442                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
 443                 }
 444         } else if (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31) {
 445                 /* Special files don't need an rdev number, so just make
 446                  * the historical transmission of the value efficient. */
 447                 if (protocol_version < 28)
 448                         xflags |= XMIT_SAME_RDEV_pre28;
 449                 else {
 450                         rdev = MAKEDEV(major(rdev), 0);
 451                         xflags |= XMIT_SAME_RDEV_MAJOR;
 452                         if (protocol_version < 30)
 453                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
 454                 }
 455         } else if (protocol_version < 28)
 456                 rdev = MAKEDEV(0, 0);
 457         if (!preserve_uid || ((uid_t)F_OWNER(file) == uid && *lastname))
 458                 xflags |= XMIT_SAME_UID;
 459         else {
 460                 uid = F_OWNER(file);
 461                 if (!numeric_ids) {
 462                         user_name = add_uid(uid);
 463                         if (inc_recurse && user_name)
 464                                 xflags |= XMIT_USER_NAME_FOLLOWS;
 465                 }
 466         }
 467         if (!preserve_gid || ((gid_t)F_GROUP(file) == gid && *lastname))
 468                 xflags |= XMIT_SAME_GID;
 469         else {
 470                 gid = F_GROUP(file);
 471                 if (!numeric_ids) {
 472                         group_name = add_gid(gid);
 473                         if (inc_recurse && group_name)
 474                                 xflags |= XMIT_GROUP_NAME_FOLLOWS;
 475                 }
 476         }
 477         if (file->modtime == modtime)
 478                 xflags |= XMIT_SAME_TIME;
 479         else
 480                 modtime = file->modtime;
 481         if (NSEC_BUMP(file) && protocol_version >= 31)
 482                 xflags |= XMIT_MOD_NSEC;
 483         if (atimes_ndx && !S_ISDIR(mode)) {
 484                 if (F_ATIME(file) == atime)
 485                         xflags |= XMIT_SAME_ATIME;
 486                 else
 487                         atime = F_ATIME(file);
 488         }
 489
 490 #ifdef SUPPORT_HARD_LINKS
 491         if (tmp_dev != -1) {
 492                 if (protocol_version >= 30) {
 493                         struct ht_int64_node *np = idev_find(tmp_dev, tmp_ino);
 494                         first_hlink_ndx = (int32)(long)np->data - 1;
 495                         if (first_hlink_ndx < 0) {
 496                                 np->data = (void*)(long)(first_ndx + ndx + 1);
 497                                 xflags |= XMIT_HLINK_FIRST;
 498                         }
 499                         if (DEBUG_GTE(HLINK, 1)) {
 500                                 if (first_hlink_ndx >= 0) {
 501                                         rprintf(FINFO, "[%s] #%d hard-links #%d (%sabbrev)\n",
 502                                                 who_am_i(), first_ndx + ndx, first_hlink_ndx,
 503                                                 first_hlink_ndx >= first_ndx ? "" : "un");
 504                                 } else if (DEBUG_GTE(HLINK, 3)) {
 505                                         rprintf(FINFO, "[%s] dev:inode for #%d is %s:%s\n",
 506                                                 who_am_i(), first_ndx + ndx,
 507                                                 big_num(tmp_dev), big_num(tmp_ino));
 508                                 }
 509                         }
 510                 } else {
 511                         if (tmp_dev == dev) {
 512                                 if (protocol_version >= 28)
 513                                         xflags |= XMIT_SAME_DEV_pre30;
 514                         } else
 515                                 dev = tmp_dev;
 516                 }
 517                 xflags |= XMIT_HLINKED;
 518         }
 519 #endif
 520
 521         for (l1 = 0;
 522             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 523             l1++) {}
 524         l2 = strlen(fname+l1);
 525
 526         if (l1 > 0)
 527                 xflags |= XMIT_SAME_NAME;
 528         if (l2 > 255)
 529                 xflags |= XMIT_LONG_NAME;
 530
 531         /* We must make sure we don't send a zero flag byte or the
 532          * other end will terminate the flist transfer.  Note that
 533          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 534          * it's harmless way to add a bit to the first flag byte. */
 535         if (protocol_version >= 28) {
 536                 if (!xflags && !S_ISDIR(mode))
 537                         xflags |= XMIT_TOP_DIR;
 538                 if ((xflags & 0xFF00) || !xflags) {
 539                         xflags |= XMIT_EXTENDED_FLAGS;
 540                         write_shortint(f, xflags);
 541                 } else
 542                         write_byte(f, xflags);
 543         } else {
 544                 if (!(xflags & 0xFF))
 545                         xflags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 546                 write_byte(f, xflags);
 547         }
 548         if (xflags & XMIT_SAME_NAME)
 549                 write_byte(f, l1);
 550         if (xflags & XMIT_LONG_NAME)
 551                 write_varint30(f, l2);
 552         else
 553                 write_byte(f, l2);
 554         write_buf(f, fname + l1, l2);
 555
 556 #ifdef SUPPORT_HARD_LINKS
 557         if (first_hlink_ndx >= 0) {
 558                 write_varint(f, first_hlink_ndx);
 559                 if (first_hlink_ndx >= first_ndx)
 560                         goto the_end;
 561         }
 562 #endif
 563
 564         write_varlong30(f, F_LENGTH(file), 3);
 565         if (!(xflags & XMIT_SAME_TIME)) {
 566                 if (protocol_version >= 30)
 567                         write_varlong(f, modtime, 4);
 568                 else
 569                         write_int(f, modtime);
 570         }
 571         if (xflags & XMIT_MOD_NSEC)
 572                 write_varint(f, F_MOD_NSEC(file));
 573         if (!(xflags & XMIT_SAME_MODE))
 574                 write_int(f, to_wire_mode(mode));
 575         if (atimes_ndx && !S_ISDIR(mode) && !(xflags & XMIT_SAME_ATIME))
 576                 write_varlong(f, atime, 4);
 577         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
 578                 if (protocol_version < 30)
 579                         write_int(f, uid);
 580                 else {
 581                         write_varint(f, uid);
 582                         if (xflags & XMIT_USER_NAME_FOLLOWS) {
 583                                 int len = strlen(user_name);
 584                                 write_byte(f, len);
 585                                 write_buf(f, user_name, len);
 586                         }
 587                 }
 588         }
 589         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
 590                 if (protocol_version < 30)
 591                         write_int(f, gid);
 592                 else {
 593                         write_varint(f, gid);
 594                         if (xflags & XMIT_GROUP_NAME_FOLLOWS) {
 595                                 int len = strlen(group_name);
 596                                 write_byte(f, len);
 597                                 write_buf(f, group_name, len);
 598                         }
 599                 }
 600         }
 601         if ((preserve_devices && IS_DEVICE(mode))
 602          || (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31)) {
 603                 if (protocol_version < 28) {
 604                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 605                                 write_int(f, (int)rdev);
 606                 } else {
 607                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 608                                 write_varint30(f, major(rdev));
 609                         if (protocol_version >= 30)
 610                                 write_varint(f, minor(rdev));
 611                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 612                                 write_byte(f, minor(rdev));
 613                         else
 614                                 write_int(f, minor(rdev));
 615                 }
 616         }
 617
 618 #ifdef SUPPORT_LINKS
 619         if (symlink_len) {
 620                 write_varint30(f, symlink_len);
 621                 write_buf(f, symlink_name, symlink_len);
 622         }
 623 #endif
 624
 625 #ifdef SUPPORT_HARD_LINKS
 626         if (tmp_dev != -1 && protocol_version < 30) {
 627                 /* Older protocols expect the dev number to be transmitted
 628                  * 1-incremented so that it is never zero. */
 629                 if (protocol_version < 26) {
 630                         /* 32-bit dev_t and ino_t */
 631                         write_int(f, (int32)(dev+1));
 632                         write_int(f, (int32)tmp_ino);
 633                 } else {
 634                         /* 64-bit dev_t and ino_t */
 635                         if (!(xflags & XMIT_SAME_DEV_pre30))
 636                                 write_longint(f, dev+1);
 637                         write_longint(f, tmp_ino);
 638                 }
 639         }
 640 #endif
 641
 642         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 643                 const char *sum;
 644                 if (S_ISREG(mode))
 645                         sum = tmp_sum;
 646                 else {
 647                         /* Prior to 28, we sent a useless set of nulls. */
 648                         sum = empty_sum;
 649                 }
 650                 write_buf(f, sum, flist_csum_len);
 651         }
 652
 653 #ifdef SUPPORT_HARD_LINKS
 654   the_end:
 655 #endif
 656         strlcpy(lastname, fname, MAXPATHLEN);
 657
 658         if (S_ISREG(mode) || S_ISLNK(mode))
 659                 stats.total_size += F_LENGTH(file);
 660 }
 661
 662 static struct file_struct *recv_file_entry(int f, struct file_list *flist, int xflags)
 663 {
 664         static int64 modtime, atime;
 665         static mode_t mode;
 666 #ifdef SUPPORT_HARD_LINKS
 667         static int64 dev;
 668 #endif
 669         static dev_t rdev;
 670         static uint32 rdev_major;
 671         static uid_t uid;
 672         static gid_t gid;
 673         static uint16 gid_flags;
 674         static char lastname[MAXPATHLEN], *lastdir;
 675         static int lastdir_depth, lastdir_len = -1;
 676         static unsigned int del_hier_name_len = 0;
 677         static int in_del_hier = 0;
 678         char thisname[MAXPATHLEN];
 679         unsigned int l1 = 0, l2 = 0;
 680         int alloc_len, basename_len, linkname_len;
 681         int extra_len = file_extra_cnt * EXTRA_LEN;
 682         int first_hlink_ndx = -1;
 683         int64 file_length;
 684         uint32 modtime_nsec;
 685         const char *basename;
 686         struct file_struct *file;
 687         alloc_pool_t *pool;
 688         char *bp;
 689
 690         if (xflags & XMIT_SAME_NAME)
 691                 l1 = read_byte(f);
 692
 693         if (xflags & XMIT_LONG_NAME)
 694                 l2 = read_varint30(f);
 695         else
 696                 l2 = read_byte(f);
 697
 698         if (l2 >= MAXPATHLEN - l1) {
 699                 rprintf(FERROR,
 700                         "overflow: xflags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 701                         xflags, l1, l2, lastname, who_am_i());
 702                 overflow_exit("recv_file_entry");
 703         }
 704
 705         strlcpy(thisname, lastname, l1 + 1);
 706         read_sbuf(f, &thisname[l1], l2);
 707         thisname[l1 + l2] = 0;
 708
 709         /* Abuse basename_len for a moment... */
 710         basename_len = strlcpy(lastname, thisname, MAXPATHLEN);
 711
 712 #ifdef ICONV_OPTION
 713         if (ic_recv != (iconv_t)-1) {
 714                 xbuf outbuf, inbuf;
 715
 716                 INIT_CONST_XBUF(outbuf, thisname);
 717                 INIT_XBUF(inbuf, lastname, basename_len, (size_t)-1);
 718
 719                 if (iconvbufs(ic_recv, &inbuf, &outbuf, ICB_INIT) < 0) {
 720                         io_error |= IOERR_GENERAL;
 721                         rprintf(FERROR_UTF8,
 722                             "[%s] cannot convert filename: %s (%s)\n",
 723                             who_am_i(), lastname, strerror(errno));
 724                         outbuf.len = 0;
 725                 }
 726                 thisname[outbuf.len] = '\0';
 727         }
 728 #endif
 729
 730         if (*thisname
 731          && (clean_fname(thisname, CFN_REFUSE_DOT_DOT_DIRS) < 0 || (!relative_paths && *thisname == '/'))) {
 732                 rprintf(FERROR, "ABORTING due to unsafe pathname from sender: %s\n", thisname);
 733                 exit_cleanup(RERR_PROTOCOL);
 734         }
 735
 736         if (sanitize_paths)
 737                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
 738
 739         if ((basename = strrchr(thisname, '/')) != NULL) {
 740                 int len = basename++ - thisname;
 741                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 742                         lastdir = new_array(char, len + 1);
 743                         memcpy(lastdir, thisname, len);
 744                         lastdir[len] = '\0';
 745                         lastdir_len = len;
 746                         lastdir_depth = count_dir_elements(lastdir);
 747                 }
 748         } else
 749                 basename = thisname;
 750         basename_len = strlen(basename) + 1; /* count the '\0' */
 751
 752 #ifdef SUPPORT_HARD_LINKS
 753         if (protocol_version >= 30
 754          && BITS_SETnUNSET(xflags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 755                 first_hlink_ndx = read_varint(f);
 756                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->ndx_start + flist->used) {
 757                         rprintf(FERROR,
 758                                 "hard-link reference out of range: %d (%d)\n",
 759                                 first_hlink_ndx, flist->ndx_start + flist->used);
 760                         exit_cleanup(RERR_PROTOCOL);
 761                 }
 762                 if (DEBUG_GTE(HLINK, 1)) {
 763                         rprintf(FINFO, "[%s] #%d hard-links #%d (%sabbrev)\n",
 764                                 who_am_i(), flist->used+flist->ndx_start, first_hlink_ndx,
 765                                 first_hlink_ndx >= flist->ndx_start ? "" : "un");
 766                 }
 767                 if (first_hlink_ndx >= flist->ndx_start) {
 768                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
 769                         file_length = F_LENGTH(first);
 770                         modtime = first->modtime;
 771                         modtime_nsec = F_MOD_NSEC_or_0(first);
 772                         mode = first->mode;
 773                         if (preserve_uid)
 774                                 uid = F_OWNER(first);
 775                         if (preserve_gid)
 776                                 gid = F_GROUP(first);
 777                         if (preserve_devices && IS_DEVICE(mode)) {
 778                                 uint32 *devp = F_RDEV_P(first);
 779                                 rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 780                                 extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 781                         }
 782                         if (preserve_links && S_ISLNK(mode))
 783                                 linkname_len = strlen(F_SYMLINK(first)) + 1;
 784                         else
 785                                 linkname_len = 0;
 786                         goto create_object;
 787                 }
 788         }
 789 #endif
 790
 791         file_length = read_varlong30(f, 3);
 792         if (!(xflags & XMIT_SAME_TIME)) {
 793                 if (protocol_version >= 30) {
 794                         modtime = read_varlong(f, 4);
 795 #if SIZEOF_TIME_T < SIZEOF_INT64
 796                         if (!am_generator && (int64)(time_t)modtime != modtime) {
 797                                 rprintf(FERROR_XFER,
 798                                     "Time value of %s truncated on receiver.\n",
 799                                     lastname);
 800                         }
 801 #endif
 802                 } else
 803                         modtime = read_int(f);
 804         }
 805         if (xflags & XMIT_MOD_NSEC)
 806                 modtime_nsec = read_varint(f);
 807         else
 808                 modtime_nsec = 0;
 809         if (!(xflags & XMIT_SAME_MODE))
 810                 mode = from_wire_mode(read_int(f));
 811         if (atimes_ndx && !S_ISDIR(mode) && !(xflags & XMIT_SAME_ATIME)) {
 812                 atime = read_varlong(f, 4);
 813 #if SIZEOF_TIME_T < SIZEOF_INT64
 814                 if (!am_generator && (int64)(time_t)atime != atime) {
 815                         rprintf(FERROR_XFER,
 816                                 "Access time value of %s truncated on receiver.\n",
 817                                 lastname);
 818                 }
 819 #endif
 820         }
 821
 822         if (chmod_modes && !S_ISLNK(mode) && mode)
 823                 mode = tweak_mode(mode, chmod_modes);
 824
 825         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
 826                 if (protocol_version < 30)
 827                         uid = (uid_t)read_int(f);
 828                 else {
 829                         uid = (uid_t)read_varint(f);
 830                         if (xflags & XMIT_USER_NAME_FOLLOWS)
 831                                 uid = recv_user_name(f, uid);
 832                         else if (inc_recurse && am_root && (!numeric_ids || usermap))
 833                                 uid = match_uid(uid);
 834                 }
 835         }
 836         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
 837                 if (protocol_version < 30)
 838                         gid = (gid_t)read_int(f);
 839                 else {
 840                         gid = (gid_t)read_varint(f);
 841                         gid_flags = 0;
 842                         if (xflags & XMIT_GROUP_NAME_FOLLOWS)
 843                                 gid = recv_group_name(f, gid, &gid_flags);
 844                         else if (inc_recurse && (!am_root || !numeric_ids || groupmap))
 845                                 gid = match_gid(gid, &gid_flags);
 846                 }
 847         }
 848
 849         if ((preserve_devices && IS_DEVICE(mode))
 850          || (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31)) {
 851                 if (protocol_version < 28) {
 852                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 853                                 rdev = (dev_t)read_int(f);
 854                 } else {
 855                         uint32 rdev_minor;
 856                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 857                                 rdev_major = read_varint30(f);
 858                         if (protocol_version >= 30)
 859                                 rdev_minor = read_varint(f);
 860                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 861                                 rdev_minor = read_byte(f);
 862                         else
 863                                 rdev_minor = read_int(f);
 864                         rdev = MAKEDEV(rdev_major, rdev_minor);
 865                 }
 866                 if (IS_DEVICE(mode))
 867                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 868                 file_length = 0;
 869         } else if (protocol_version < 28)
 870                 rdev = MAKEDEV(0, 0);
 871
 872 #ifdef SUPPORT_LINKS
 873         if (preserve_links && S_ISLNK(mode)) {
 874                 linkname_len = read_varint30(f) + 1; /* count the '\0' */
 875                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 876                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 877                                 linkname_len - 1);
 878                         overflow_exit("recv_file_entry");
 879                 }
 880 #ifdef ICONV_OPTION
 881                 /* We don't know how much extra room we need to convert
 882                  * the as-yet-unread symlink data, so let's hope that a
 883                  * double-size buffer is plenty. */
 884                 if (sender_symlink_iconv)
 885                         linkname_len *= 2;
 886 #endif
 887                 if (munge_symlinks)
 888                         linkname_len += SYMLINK_PREFIX_LEN;
 889         }
 890         else
 891 #endif
 892                 linkname_len = 0;
 893
 894 #ifdef SUPPORT_HARD_LINKS
 895   create_object:
 896         if (preserve_hard_links) {
 897                 if (protocol_version < 28 && S_ISREG(mode))
 898                         xflags |= XMIT_HLINKED;
 899                 if (xflags & XMIT_HLINKED)
 900                         extra_len += (inc_recurse+1) * EXTRA_LEN;
 901         }
 902 #endif
 903
 904 #ifdef SUPPORT_ACLS
 905         /* Directories need an extra int32 for the default ACL. */
 906         if (preserve_acls && S_ISDIR(mode))
 907                 extra_len += EXTRA_LEN;
 908 #endif
 909
 910         if (always_checksum && S_ISREG(mode))
 911                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 912
 913 #if SIZEOF_INT64 >= 8
 914         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 915                 extra_len += EXTRA_LEN;
 916 #endif
 917 #ifdef CAN_SET_NSEC
 918         if (modtime_nsec)
 919                 extra_len += EXTRA_LEN;
 920 #endif
 921         if (file_length < 0) {
 922                 rprintf(FERROR, "Offset underflow: file-length is negative\n");
 923                 exit_cleanup(RERR_UNSUPPORTED);
 924         }
 925
 926         if (inc_recurse && S_ISDIR(mode)) {
 927                 if (one_file_system) {
 928                         /* Room to save the dir's device for -x */
 929                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 930                 }
 931                 pool = dir_flist->file_pool;
 932         } else
 933                 pool = flist->file_pool;
 934
 935 #if EXTRA_ROUNDING > 0
 936         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 937                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 938 #endif
 939
 940         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 941                   + linkname_len;
 942         bp = pool_alloc(pool, alloc_len, "recv_file_entry");
 943
 944         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 945         bp += extra_len;
 946         file = (struct file_struct *)bp;
 947         bp += FILE_STRUCT_LEN;
 948
 949         memcpy(bp, basename, basename_len);
 950
 951 #ifdef SUPPORT_HARD_LINKS
 952         if (xflags & XMIT_HLINKED
 953 #ifndef CAN_HARDLINK_SYMLINK
 954          && !S_ISLNK(mode)
 955 #endif
 956 #ifndef CAN_HARDLINK_SPECIAL
 957          && !IS_SPECIAL(mode) && !IS_DEVICE(mode)
 958 #endif
 959         )
 960                 file->flags |= FLAG_HLINKED;
 961 #endif
 962         file->modtime = (time_t)modtime;
 963 #ifdef CAN_SET_NSEC
 964         if (modtime_nsec) {
 965                 file->flags |= FLAG_MOD_NSEC;
 966                 F_MOD_NSEC(file) = modtime_nsec;
 967         }
 968 #endif
 969         file->len32 = (uint32)file_length;
 970 #if SIZEOF_INT64 >= 8
 971         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 972 #if SIZEOF_CAPITAL_OFF_T < 8
 973                 rprintf(FERROR, "Offset overflow: attempted 64-bit file-length\n");
 974                 exit_cleanup(RERR_UNSUPPORTED);
 975 #else
 976                 file->flags |= FLAG_LENGTH64;
 977                 F_HIGH_LEN(file) = (uint32)(file_length >> 32);
 978 #endif
 979         }
 980 #endif
 981         file->mode = mode;
 982         if (preserve_uid)
 983                 F_OWNER(file) = uid;
 984         if (preserve_gid) {
 985                 F_GROUP(file) = gid;
 986                 file->flags |= gid_flags;
 987         }
 988         if (atimes_ndx)
 989                 F_ATIME(file) = atime;
 990         if (unsort_ndx)
 991                 F_NDX(file) = flist->used + flist->ndx_start;
 992
 993         if (basename != thisname) {
 994                 file->dirname = lastdir;
 995                 F_DEPTH(file) = lastdir_depth + 1;
 996         } else
 997                 F_DEPTH(file) = 1;
 998
 999         if (S_ISDIR(mode)) {
1000                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
1001                         F_DEPTH(file)--;
1002                 if (protocol_version >= 30) {
1003                         if (!(xflags & XMIT_NO_CONTENT_DIR)) {
1004                                 if (xflags & XMIT_TOP_DIR)
1005                                         file->flags |= FLAG_TOP_DIR;
1006                                 file->flags |= FLAG_CONTENT_DIR;
1007                         } else if (xflags & XMIT_TOP_DIR)
1008                                 file->flags |= FLAG_IMPLIED_DIR;
1009                 } else if (xflags & XMIT_TOP_DIR) {
1010                         in_del_hier = recurse;
1011                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
1012                         if (relative_paths && del_hier_name_len > 2
1013                             && lastname[del_hier_name_len-1] == '.'
1014                             && lastname[del_hier_name_len-2] == '/')
1015                                 del_hier_name_len -= 2;
1016                         file->flags |= FLAG_TOP_DIR | FLAG_CONTENT_DIR;
1017                 } else if (in_del_hier) {
1018                         if (!relative_paths || !del_hier_name_len
1019                          || (l1 >= del_hier_name_len
1020                           && lastname[del_hier_name_len] == '/'))
1021                                 file->flags |= FLAG_CONTENT_DIR;
1022                         else
1023                                 in_del_hier = 0;
1024                 }
1025         }
1026
1027         if (preserve_devices && IS_DEVICE(mode)) {
1028                 uint32 *devp = F_RDEV_P(file);
1029                 DEV_MAJOR(devp) = major(rdev);
1030                 DEV_MINOR(devp) = minor(rdev);
1031         }
1032
1033 #ifdef SUPPORT_LINKS
1034         if (linkname_len) {
1035                 bp += basename_len;
1036                 if (first_hlink_ndx >= flist->ndx_start) {
1037                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
1038                         memcpy(bp, F_SYMLINK(first), linkname_len);
1039                 } else {
1040                         if (munge_symlinks) {
1041                                 strlcpy(bp, SYMLINK_PREFIX, linkname_len);
1042                                 bp += SYMLINK_PREFIX_LEN;
1043                                 linkname_len -= SYMLINK_PREFIX_LEN;
1044                         }
1045 #ifdef ICONV_OPTION
1046                         if (sender_symlink_iconv) {
1047                                 xbuf outbuf, inbuf;
1048
1049                                 alloc_len = linkname_len;
1050                                 linkname_len /= 2;
1051
1052                                 /* Read the symlink data into the end of our double-sized
1053                                  * buffer and then convert it into the right spot. */
1054                                 INIT_XBUF(inbuf, bp + alloc_len - linkname_len,
1055                                           linkname_len - 1, (size_t)-1);
1056                                 read_sbuf(f, inbuf.buf, inbuf.len);
1057                                 INIT_XBUF(outbuf, bp, 0, alloc_len);
1058
1059                                 if (iconvbufs(ic_recv, &inbuf, &outbuf, ICB_INIT) < 0) {
1060                                         io_error |= IOERR_GENERAL;
1061                                         rprintf(FERROR_XFER,
1062                                             "[%s] cannot convert symlink data for: %s (%s)\n",
1063                                             who_am_i(), full_fname(thisname), strerror(errno));
1064                                         bp = (char*)file->basename;
1065                                         *bp++ = '\0';
1066                                         outbuf.len = 0;
1067                                 }
1068                                 bp[outbuf.len] = '\0';
1069                         } else
1070 #endif
1071                                 read_sbuf(f, bp, linkname_len - 1);
1072                         if (sanitize_paths && !munge_symlinks && *bp)
1073                                 sanitize_path(bp, bp, "", lastdir_depth, SP_DEFAULT);
1074                 }
1075         }
1076 #endif
1077
1078 #ifdef SUPPORT_HARD_LINKS
1079         if (preserve_hard_links && xflags & XMIT_HLINKED) {
1080                 if (protocol_version >= 30) {
1081                         if (xflags & XMIT_HLINK_FIRST) {
1082                                 F_HL_GNUM(file) = flist->ndx_start + flist->used;
1083                         } else
1084                                 F_HL_GNUM(file) = first_hlink_ndx;
1085                 } else {
1086                         static int32 cnt = 0;
1087                         struct ht_int64_node *np;
1088                         int64 ino;
1089                         int32 ndx;
1090                         if (protocol_version < 26) {
1091                                 dev = read_int(f);
1092                                 ino = read_int(f);
1093                         } else {
1094                                 if (!(xflags & XMIT_SAME_DEV_pre30))
1095                                         dev = read_longint(f);
1096                                 ino = read_longint(f);
1097                         }
1098                         np = idev_find(dev, ino);
1099                         ndx = (int32)(long)np->data - 1;
1100                         if (ndx < 0) {
1101                                 ndx = cnt++;
1102                                 np->data = (void*)(long)cnt;
1103                         }
1104                         F_HL_GNUM(file) = ndx;
1105                 }
1106         }
1107 #endif
1108
1109         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
1110                 if (S_ISREG(mode))
1111                         bp = F_SUM(file);
1112                 else {
1113                         /* Prior to 28, we get a useless set of nulls. */
1114                         bp = tmp_sum;
1115                 }
1116                 if (first_hlink_ndx >= flist->ndx_start) {
1117                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
1118                         memcpy(bp, F_SUM(first), flist_csum_len);
1119                 } else
1120                         read_buf(f, bp, flist_csum_len);
1121         }
1122
1123 #ifdef SUPPORT_ACLS
1124         if (preserve_acls && !S_ISLNK(mode))
1125                 receive_acl(f, file);
1126 #endif
1127 #ifdef SUPPORT_XATTRS
1128         if (preserve_xattrs)
1129                 receive_xattr(f, file);
1130 #endif
1131
1132         if (S_ISREG(mode) || S_ISLNK(mode))
1133                 stats.total_size += file_length;
1134
1135         return file;
1136 }
1137
1138 /* Create a file_struct for a named file by reading its stat() information
1139  * and performing extensive checks against global options.
1140  *
1141  * Returns a pointer to the new file struct, or NULL if there was an error
1142  * or this file should be excluded.
1143  *
1144  * Note: Any error (here or in send_file_name) that results in the omission of
1145  * an existent source file from the file list should set
1146  * "io_error |= IOERR_GENERAL" to avoid deletion of the file from the
1147  * destination if --delete is on. */
1148 struct file_struct *make_file(const char *fname, struct file_list *flist,
1149                               STRUCT_STAT *stp, int flags, int filter_level)
1150 {
1151         static char *lastdir;
1152         static int lastdir_len = -1;
1153         struct file_struct *file;
1154         char thisname[MAXPATHLEN];
1155         char linkname[MAXPATHLEN];
1156         int alloc_len, basename_len, linkname_len;
1157         int extra_len = file_extra_cnt * EXTRA_LEN;
1158         const char *basename;
1159         alloc_pool_t *pool;
1160         STRUCT_STAT st;
1161         char *bp;
1162
1163         if (strlcpy(thisname, fname, sizeof thisname) >= sizeof thisname) {
1164                 io_error |= IOERR_GENERAL;
1165                 rprintf(FERROR_XFER, "skipping overly long name: %s\n", fname);
1166                 return NULL;
1167         }
1168         clean_fname(thisname, 0);
1169         if (sanitize_paths)
1170                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
1171
1172         if (stp && (S_ISDIR(stp->st_mode) || IS_MISSING_FILE(*stp))) {
1173                 /* This is needed to handle a "symlink/." with a --relative
1174                  * dir, or a request to delete a specific file. */
1175                 st = *stp;
1176                 *linkname = '\0'; /* make IBM code checker happy */
1177         } else if (readlink_stat(thisname, &st, linkname) != 0) {
1178                 int save_errno = errno;
1179                 /* See if file is excluded before reporting an error. */
1180                 if (filter_level != NO_FILTERS
1181                  && (is_excluded(thisname, 0, filter_level)
1182                   || is_excluded(thisname, 1, filter_level))) {
1183                         if (ignore_perishable && save_errno != ENOENT)
1184                                 non_perishable_cnt++;
1185                         return NULL;
1186                 }
1187                 if (save_errno == ENOENT) {
1188 #ifdef SUPPORT_LINKS
1189                         /* When our options tell us to follow a symlink that
1190                          * points nowhere, tell the user about the symlink
1191                          * instead of giving a "vanished" message.  We only
1192                          * dereference a symlink if one of the --copy*links
1193                          * options was specified, so there's no need for the
1194                          * extra lstat() if one of these options isn't on. */
1195                         if ((copy_links || copy_unsafe_links || copy_dirlinks)
1196                          && x_lstat(thisname, &st, NULL) == 0
1197                          && S_ISLNK(st.st_mode)) {
1198                                 io_error |= IOERR_GENERAL;
1199                                 rprintf(FERROR_XFER, "symlink has no referent: %s\n",
1200                                         full_fname(thisname));
1201                         } else
1202 #endif
1203                         {
1204                                 enum logcode c = am_daemon && protocol_version < 28
1205                                                ? FERROR : FWARNING;
1206                                 io_error |= IOERR_VANISHED;
1207                                 rprintf(c, "file has vanished: %s\n",
1208                                         full_fname(thisname));
1209                         }
1210                 } else {
1211                         io_error |= IOERR_GENERAL;
1212                         rsyserr(FERROR_XFER, save_errno, "readlink_stat(%s) failed",
1213                                 full_fname(thisname));
1214                 }
1215                 return NULL;
1216         } else if (IS_MISSING_FILE(st)) {
1217                 io_error |= IOERR_GENERAL;
1218                 rprintf(FINFO, "skipping file with bogus (zero) st_mode: %s\n",
1219                         full_fname(thisname));
1220                 return NULL;
1221         }
1222
1223         if (filter_level == NO_FILTERS)
1224                 goto skip_filters;
1225
1226         if (S_ISDIR(st.st_mode)) {
1227                 if (!xfer_dirs) {
1228                         rprintf(FINFO, "skipping directory %s\n", thisname);
1229                         return NULL;
1230                 }
1231                 /* -x only affects dirs because we need to avoid recursing
1232                  * into a mount-point directory, not to avoid copying a
1233                  * symlinked file if -L (or similar) was specified. */
1234                 if (one_file_system && st.st_dev != filesystem_dev
1235                  && BITS_SETnUNSET(flags, FLAG_CONTENT_DIR, FLAG_TOP_DIR)) {
1236                         if (one_file_system > 1) {
1237                                 if (INFO_GTE(MOUNT, 1)) {
1238                                         rprintf(FINFO,
1239                                             "[%s] skipping mount-point dir %s\n",
1240                                             who_am_i(), thisname);
1241                                 }
1242                                 return NULL;
1243                         }
1244                         flags |= FLAG_MOUNT_DIR;
1245                         flags &= ~FLAG_CONTENT_DIR;
1246                 }
1247         } else
1248                 flags &= ~FLAG_CONTENT_DIR;
1249
1250         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
1251                 if (ignore_perishable)
1252                         non_perishable_cnt++;
1253                 return NULL;
1254         }
1255
1256         if (lp_ignore_nonreadable(module_id)) {
1257 #ifdef SUPPORT_LINKS
1258                 if (!S_ISLNK(st.st_mode))
1259 #endif
1260                         if (access(thisname, R_OK) != 0)
1261                                 return NULL;
1262         }
1263
1264   skip_filters:
1265
1266         /* Only divert a directory in the main transfer. */
1267         if (flist) {
1268                 if (flist->prev && S_ISDIR(st.st_mode)
1269                  && flags & FLAG_DIVERT_DIRS) {
1270                         /* Room for parent/sibling/next-child info. */
1271                         extra_len += DIRNODE_EXTRA_CNT * EXTRA_LEN;
1272                         if (relative_paths)
1273                                 extra_len += PTR_EXTRA_CNT * EXTRA_LEN;
1274                         pool = dir_flist->file_pool;
1275                 } else
1276                         pool = flist->file_pool;
1277         } else {
1278 #ifdef SUPPORT_ACLS
1279                 /* Directories need an extra int32 for the default ACL. */
1280                 if (preserve_acls && S_ISDIR(st.st_mode))
1281                         extra_len += EXTRA_LEN;
1282 #endif
1283                 pool = NULL;
1284         }
1285
1286         if (DEBUG_GTE(FLIST, 2)) {
1287                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1288                         who_am_i(), thisname, filter_level);
1289         }
1290
1291         if ((basename = strrchr(thisname, '/')) != NULL) {
1292                 int len = basename++ - thisname;
1293                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1294                         lastdir = new_array(char, len + 1);
1295                         memcpy(lastdir, thisname, len);
1296                         lastdir[len] = '\0';
1297                         lastdir_len = len;
1298                 }
1299         } else
1300                 basename = thisname;
1301         basename_len = strlen(basename) + 1; /* count the '\0' */
1302
1303 #ifdef SUPPORT_LINKS
1304         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1305 #else
1306         linkname_len = 0;
1307 #endif
1308
1309 #ifdef ST_MTIME_NSEC
1310         if (st.ST_MTIME_NSEC && protocol_version >= 31)
1311                 extra_len += EXTRA_LEN;
1312 #endif
1313 #if SIZEOF_CAPITAL_OFF_T >= 8
1314         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1315                 extra_len += EXTRA_LEN;
1316 #endif
1317
1318         if (always_checksum && am_sender && S_ISREG(st.st_mode)) {
1319                 file_checksum(thisname, &st, tmp_sum);
1320                 if (sender_keeps_checksum)
1321                         extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
1322         }
1323
1324 #if EXTRA_ROUNDING > 0
1325         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1326                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1327 #endif
1328
1329         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1330                   + linkname_len;
1331         if (pool)
1332                 bp = pool_alloc(pool, alloc_len, "make_file");
1333         else {
1334                 if (!(bp = new_array(char, alloc_len)))
1335                         out_of_memory("make_file");
1336         }
1337
1338         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1339         bp += extra_len;
1340         file = (struct file_struct *)bp;
1341         bp += FILE_STRUCT_LEN;
1342
1343         memcpy(bp, basename, basename_len);
1344
1345 #ifdef SUPPORT_HARD_LINKS
1346         if (preserve_hard_links && flist && flist->prev) {
1347                 if (protocol_version >= 28
1348                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1349                  : S_ISREG(st.st_mode)) {
1350                         tmp_dev = (int64)st.st_dev;
1351                         tmp_ino = (int64)st.st_ino;
1352                 } else
1353                         tmp_dev = -1;
1354         }
1355 #endif
1356
1357 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1358         if (IS_DEVICE(st.st_mode)) {
1359                 tmp_rdev = st.st_rdev;
1360                 st.st_size = 0;
1361         } else if (IS_SPECIAL(st.st_mode))
1362                 st.st_size = 0;
1363 #endif
1364
1365         file->flags = flags;
1366         file->modtime = st.st_mtime;
1367 #ifdef ST_MTIME_NSEC
1368         if (st.ST_MTIME_NSEC && protocol_version >= 31) {
1369                 file->flags |= FLAG_MOD_NSEC;
1370                 F_MOD_NSEC(file) = st.ST_MTIME_NSEC;
1371         }
1372 #endif
1373         file->len32 = (uint32)st.st_size;
1374 #if SIZEOF_CAPITAL_OFF_T >= 8
1375         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1376                 file->flags |= FLAG_LENGTH64;
1377                 F_HIGH_LEN(file) = (uint32)(st.st_size >> 32);
1378         }
1379 #endif
1380         file->mode = st.st_mode;
1381         if (preserve_uid)
1382                 F_OWNER(file) = st.st_uid;
1383         if (preserve_gid)
1384                 F_GROUP(file) = st.st_gid;
1385         if (am_generator && st.st_uid == our_uid)
1386                 file->flags |= FLAG_OWNED_BY_US;
1387         if (atimes_ndx)
1388                 F_ATIME(file) = st.st_atime;
1389
1390         if (basename != thisname)
1391                 file->dirname = lastdir;
1392
1393 #ifdef SUPPORT_LINKS
1394         if (linkname_len)
1395                 memcpy(bp + basename_len, linkname, linkname_len);
1396 #endif
1397
1398         if (am_sender)
1399                 F_PATHNAME(file) = pathname;
1400         else if (!pool)
1401                 F_DEPTH(file) = extra_len / EXTRA_LEN;
1402
1403         if (basename_len == 0+1) {
1404                 if (!pool)
1405                         unmake_file(file);
1406                 return NULL;
1407         }
1408
1409         if (sender_keeps_checksum && S_ISREG(st.st_mode))
1410                 memcpy(F_SUM(file), tmp_sum, flist_csum_len);
1411
1412         if (unsort_ndx)
1413                 F_NDX(file) = stats.num_dirs;
1414
1415         return file;
1416 }
1417
1418 /* Only called for temporary file_struct entries created by make_file(). */
1419 void unmake_file(struct file_struct *file)
1420 {
1421         free(REQ_EXTRA(file, F_DEPTH(file)));
1422 }
1423
1424 static struct file_struct *send_file_name(int f, struct file_list *flist,
1425                                           const char *fname, STRUCT_STAT *stp,
1426                                           int flags, int filter_level)
1427 {
1428         struct file_struct *file;
1429
1430         file = make_file(fname, flist, stp, flags, filter_level);
1431         if (!file)
1432                 return NULL;
1433
1434         if (chmod_modes && !S_ISLNK(file->mode) && file->mode)
1435                 file->mode = tweak_mode(file->mode, chmod_modes);
1436
1437         if (f >= 0) {
1438                 char fbuf[MAXPATHLEN];
1439 #ifdef SUPPORT_LINKS
1440                 const char *symlink_name;
1441                 int symlink_len;
1442 #ifdef ICONV_OPTION
1443                 char symlink_buf[MAXPATHLEN];
1444 #endif
1445 #endif
1446 #if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
1447                 stat_x sx;
1448                 init_stat_x(&sx);
1449 #endif
1450
1451 #ifdef SUPPORT_LINKS
1452                 if (preserve_links && S_ISLNK(file->mode)) {
1453                         symlink_name = F_SYMLINK(file);
1454                         symlink_len = strlen(symlink_name);
1455                         if (symlink_len == 0) {
1456                                 io_error |= IOERR_GENERAL;
1457                                 f_name(file, fbuf);
1458                                 rprintf(FERROR_XFER,
1459                                     "skipping symlink with 0-length value: %s\n",
1460                                     full_fname(fbuf));
1461                                 return NULL;
1462                         }
1463                 } else {
1464                         symlink_name = NULL;
1465                         symlink_len = 0;
1466                 }
1467 #endif
1468
1469 #ifdef ICONV_OPTION
1470                 if (ic_send != (iconv_t)-1) {
1471                         xbuf outbuf, inbuf;
1472
1473                         INIT_CONST_XBUF(outbuf, fbuf);
1474
1475                         if (file->dirname) {
1476                                 INIT_XBUF_STRLEN(inbuf, (char*)file->dirname);
1477                                 outbuf.size -= 2; /* Reserve room for '/' & 1 more char. */
1478                                 if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0)
1479                                         goto convert_error;
1480                                 outbuf.size += 2;
1481                                 fbuf[outbuf.len++] = '/';
1482                         }
1483
1484                         INIT_XBUF_STRLEN(inbuf, (char*)file->basename);
1485                         if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0) {
1486                           convert_error:
1487                                 io_error |= IOERR_GENERAL;
1488                                 rprintf(FERROR_XFER,
1489                                     "[%s] cannot convert filename: %s (%s)\n",
1490                                     who_am_i(), f_name(file, fbuf), strerror(errno));
1491                                 return NULL;
1492                         }
1493                         fbuf[outbuf.len] = '\0';
1494
1495 #ifdef SUPPORT_LINKS
1496                         if (symlink_len && sender_symlink_iconv) {
1497                                 INIT_XBUF(inbuf, (char*)symlink_name, symlink_len, (size_t)-1);
1498                                 INIT_CONST_XBUF(outbuf, symlink_buf);
1499                                 if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0) {
1500                                         io_error |= IOERR_GENERAL;
1501                                         f_name(file, fbuf);
1502                                         rprintf(FERROR_XFER,
1503                                             "[%s] cannot convert symlink data for: %s (%s)\n",
1504                                             who_am_i(), full_fname(fbuf), strerror(errno));
1505                                         return NULL;
1506                                 }
1507                                 symlink_buf[outbuf.len] = '\0';
1508
1509                                 symlink_name = symlink_buf;
1510                                 symlink_len = outbuf.len;
1511                         }
1512 #endif
1513                 } else
1514 #endif
1515                         f_name(file, fbuf);
1516
1517 #ifdef SUPPORT_ACLS
1518                 if (preserve_acls && !S_ISLNK(file->mode)) {
1519                         sx.st.st_mode = file->mode;
1520                         if (get_acl(fname, &sx) < 0) {
1521                                 io_error |= IOERR_GENERAL;
1522                                 return NULL;
1523                         }
1524                 }
1525 #endif
1526 #ifdef SUPPORT_XATTRS
1527                 if (preserve_xattrs) {
1528                         sx.st.st_mode = file->mode;
1529                         if (get_xattr(fname, &sx) < 0) {
1530                                 io_error |= IOERR_GENERAL;
1531                                 return NULL;
1532                         }
1533                 }
1534 #endif
1535
1536                 send_file_entry(f, fbuf, file,
1537 #ifdef SUPPORT_LINKS
1538                                 symlink_name, symlink_len,
1539 #endif
1540                                 flist->used, flist->ndx_start);
1541
1542 #ifdef SUPPORT_ACLS
1543                 if (preserve_acls && !S_ISLNK(file->mode)) {
1544                         send_acl(f, &sx);
1545                         free_acl(&sx);
1546                 }
1547 #endif
1548 #ifdef SUPPORT_XATTRS
1549                 if (preserve_xattrs) {
1550                         F_XATTR(file) = send_xattr(f, &sx);
1551                         free_xattr(&sx);
1552                 }
1553 #endif
1554         }
1555
1556         maybe_emit_filelist_progress(flist->used + flist_count_offset);
1557
1558         flist_expand(flist, 1);
1559         flist->files[flist->used++] = file;
1560
1561         return file;
1562 }
1563
1564 static void send_if_directory(int f, struct file_list *flist,
1565                               struct file_struct *file,
1566                               char *fbuf, unsigned int ol,
1567                               int flags)
1568 {
1569         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1570
1571         if (S_ISDIR(file->mode)
1572             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1573                 void *save_filters;
1574                 unsigned int len = strlen(fbuf);
1575                 if (len > 1 && fbuf[len-1] == '/')
1576                         fbuf[--len] = '\0';
1577                 save_filters = push_local_filters(fbuf, len);
1578                 send_directory(f, flist, fbuf, len, flags);
1579                 pop_local_filters(save_filters);
1580                 fbuf[ol] = '\0';
1581                 if (is_dot_dir)
1582                         fbuf[ol-1] = '.';
1583         }
1584 }
1585
1586 static int file_compare(const void *file1, const void *file2)
1587 {
1588         return f_name_cmp(*(struct file_struct **)file1,
1589                           *(struct file_struct **)file2);
1590 }
1591
1592 /* The guts of a merge-sort algorithm.  This was derived from the glibc
1593  * version, but I (Wayne) changed the merge code to do less copying and
1594  * to require only half the amount of temporary memory. */
1595 static void fsort_tmp(struct file_struct **fp, size_t num,
1596                       struct file_struct **tmp)
1597 {
1598         struct file_struct **f1, **f2, **t;
1599         size_t n1, n2;
1600
1601         n1 = num / 2;
1602         n2 = num - n1;
1603         f1 = fp;
1604         f2 = fp + n1;
1605
1606         if (n1 > 1)
1607                 fsort_tmp(f1, n1, tmp);
1608         if (n2 > 1)
1609                 fsort_tmp(f2, n2, tmp);
1610
1611         while (f_name_cmp(*f1, *f2) <= 0) {
1612                 if (!--n1)
1613                         return;
1614                 f1++;
1615         }
1616
1617         t = tmp;
1618         memcpy(t, f1, n1 * PTR_SIZE);
1619
1620         *f1++ = *f2++, n2--;
1621
1622         while (n1 > 0 && n2 > 0) {
1623                 if (f_name_cmp(*t, *f2) <= 0)
1624                         *f1++ = *t++, n1--;
1625                 else
1626                         *f1++ = *f2++, n2--;
1627         }
1628
1629         if (n1 > 0)
1630                 memcpy(f1, t, n1 * PTR_SIZE);
1631 }
1632
1633 /* This file-struct sorting routine makes sure that any identical names in
1634  * the file list stay in the same order as they were in the original list.
1635  * This is particularly vital in inc_recurse mode where we expect a sort
1636  * on the flist to match the exact order of a sort on the dir_flist. */
1637 static void fsort(struct file_struct **fp, size_t num)
1638 {
1639         if (num <= 1)
1640                 return;
1641
1642         if (use_qsort)
1643                 qsort(fp, num, PTR_SIZE, file_compare);
1644         else {
1645                 struct file_struct **tmp = new_array(struct file_struct *,
1646                                                      (num+1) / 2);
1647                 fsort_tmp(fp, num, tmp);
1648                 free(tmp);
1649         }
1650 }
1651
1652 /* We take an entire set of sibling dirs from the sorted flist and link them
1653  * into the tree, setting the appropriate parent/child/sibling pointers. */
1654 static void add_dirs_to_tree(int parent_ndx, struct file_list *from_flist,
1655                              int dir_cnt)
1656 {
1657         int i;
1658         int32 *dp = NULL;
1659         int32 *parent_dp = parent_ndx < 0 ? NULL
1660                          : F_DIR_NODE_P(dir_flist->sorted[parent_ndx]);
1661
1662         /* The sending side is adding entries to dir_flist in sorted order, so sorted & files are the same. */
1663         flist_expand(dir_flist, dir_cnt);
1664         dir_flist->sorted = dir_flist->files;
1665
1666         for (i = 0; dir_cnt; i++) {
1667                 struct file_struct *file = from_flist->sorted[i];
1668
1669                 if (!S_ISDIR(file->mode))
1670                         continue;
1671
1672                 dir_flist->files[dir_flist->used++] = file;
1673                 dir_cnt--;
1674
1675                 if (file->basename[0] == '.' && file->basename[1] == '\0')
1676                         continue;
1677
1678                 if (dp)
1679                         DIR_NEXT_SIBLING(dp) = dir_flist->used - 1;
1680                 else if (parent_dp)
1681                         DIR_FIRST_CHILD(parent_dp) = dir_flist->used - 1;
1682                 else
1683                         send_dir_ndx = dir_flist->used - 1;
1684
1685                 dp = F_DIR_NODE_P(file);
1686                 DIR_PARENT(dp) = parent_ndx;
1687                 DIR_FIRST_CHILD(dp) = -1;
1688         }
1689         if (dp)
1690                 DIR_NEXT_SIBLING(dp) = -1;
1691 }
1692
1693 static void interpret_stat_error(const char *fname, int is_dir)
1694 {
1695         if (errno == ENOENT) {
1696                 io_error |= IOERR_VANISHED;
1697                 rprintf(FWARNING, "%s has vanished: %s\n",
1698                         is_dir ? "directory" : "file", full_fname(fname));
1699         } else {
1700                 io_error |= IOERR_GENERAL;
1701                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
1702                         full_fname(fname));
1703         }
1704 }
1705
1706 /* This function is normally called by the sender, but the receiving side also
1707  * calls it from get_dirlist() with f set to -1 so that we just construct the
1708  * file list in memory without sending it over the wire.  Also, get_dirlist()
1709  * might call this with f set to -2, which also indicates that local filter
1710  * rules should be ignored. */
1711 static void send_directory(int f, struct file_list *flist, char *fbuf, int len,
1712                            int flags)
1713 {
1714         struct dirent *di;
1715         unsigned remainder;
1716         char *p;
1717         DIR *d;
1718         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1719         int start = flist->used;
1720         int filter_level = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1721
1722         assert(flist != NULL);
1723
1724         if (!(d = opendir(fbuf))) {
1725                 if (errno == ENOENT) {
1726                         if (am_sender) /* Can abuse this for vanished error w/ENOENT: */
1727                                 interpret_stat_error(fbuf, True);
1728                         return;
1729                 }
1730                 if (errno == ENOTDIR && (flags & FLAG_PERHAPS_DIR))
1731                         return;
1732                 io_error |= IOERR_GENERAL;
1733                 rsyserr(FERROR_XFER, errno, "opendir %s failed", full_fname(fbuf));
1734                 return;
1735         }
1736
1737         p = fbuf + len;
1738         if (len == 1 && *fbuf == '/')
1739                 remainder = MAXPATHLEN - 1;
1740         else if (len < MAXPATHLEN-1) {
1741                 *p++ = '/';
1742                 *p = '\0';
1743                 remainder = MAXPATHLEN - (len + 1);
1744         } else
1745                 remainder = 0;
1746
1747         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1748                 unsigned name_len;
1749                 char *dname = d_name(di);
1750                 if (dname[0] == '.' && (dname[1] == '\0'
1751                     || (dname[1] == '.' && dname[2] == '\0')))
1752                         continue;
1753                 name_len = strlcpy(p, dname, remainder);
1754                 if (name_len >= remainder) {
1755                         char save = fbuf[len];
1756                         fbuf[len] = '\0';
1757                         io_error |= IOERR_GENERAL;
1758                         rprintf(FERROR_XFER,
1759                                 "filename overflows max-path len by %u: %s/%s\n",
1760                                 name_len - remainder + 1, fbuf, dname);
1761                         fbuf[len] = save;
1762                         continue;
1763                 }
1764                 if (dname[0] == '\0') {
1765                         io_error |= IOERR_GENERAL;
1766                         rprintf(FERROR_XFER,
1767                                 "cannot send file with empty name in %s\n",
1768                                 full_fname(fbuf));
1769                         continue;
1770                 }
1771
1772                 send_file_name(f, flist, fbuf, NULL, flags, filter_level);
1773         }
1774
1775         fbuf[len] = '\0';
1776
1777         if (errno) {
1778                 io_error |= IOERR_GENERAL;
1779                 rsyserr(FERROR_XFER, errno, "readdir(%s)", full_fname(fbuf));
1780         }
1781
1782         closedir(d);
1783
1784         if (f >= 0 && recurse && !divert_dirs) {
1785                 int i, end = flist->used - 1;
1786                 /* send_if_directory() bumps flist->used, so use "end". */
1787                 for (i = start; i <= end; i++)
1788                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1789         }
1790 }
1791
1792 static void send_implied_dirs(int f, struct file_list *flist, char *fname,
1793                               char *start, char *limit, int flags, char name_type)
1794 {
1795         static char lastpath[MAXPATHLEN] = "";
1796         static int lastpath_len = 0;
1797         static struct file_struct *lastpath_struct = NULL;
1798         struct file_struct *file;
1799         item_list *relname_list;
1800         relnamecache **rnpp;
1801         int len, need_new_dir, depth = 0;
1802         filter_rule_list save_filter_list = filter_list;
1803
1804         flags = (flags | FLAG_IMPLIED_DIR) & ~(FLAG_TOP_DIR | FLAG_CONTENT_DIR);
1805         filter_list.head = filter_list.tail = NULL; /* Don't filter implied dirs. */
1806
1807         if (inc_recurse) {
1808                 if (lastpath_struct && F_PATHNAME(lastpath_struct) == pathname
1809                  && lastpath_len == limit - fname
1810                  && strncmp(lastpath, fname, lastpath_len) == 0)
1811                         need_new_dir = 0;
1812                 else
1813                         need_new_dir = 1;
1814         } else {
1815                 char *tp = fname, *lp = lastpath;
1816                 /* Skip any initial directories in our path that we
1817                  * have in common with lastpath. */
1818                 assert(start == fname);
1819                 for ( ; ; tp++, lp++) {
1820                         if (tp == limit) {
1821                                 if (*lp == '/' || *lp == '\0')
1822                                         goto done;
1823                                 break;
1824                         }
1825                         if (*lp != *tp)
1826                                 break;
1827                         if (*tp == '/') {
1828                                 start = tp;
1829                                 depth++;
1830                         }
1831                 }
1832                 need_new_dir = 1;
1833         }
1834
1835         if (need_new_dir) {
1836                 int save_copy_links = copy_links;
1837                 int save_xfer_dirs = xfer_dirs;
1838                 char *slash;
1839
1840                 copy_links = xfer_dirs = 1;
1841
1842                 *limit = '\0';
1843
1844                 for (slash = start; (slash = strchr(slash+1, '/')) != NULL; ) {
1845                         *slash = '\0';
1846                         file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1847                         depth++;
1848                         if (!inc_recurse && file && S_ISDIR(file->mode))
1849                                 change_local_filter_dir(fname, strlen(fname), depth);
1850                         *slash = '/';
1851                 }
1852
1853                 file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1854                 if (inc_recurse) {
1855                         if (file && !S_ISDIR(file->mode))
1856                                 file = NULL;
1857                         lastpath_struct = file;
1858                 } else if (file && S_ISDIR(file->mode))
1859                         change_local_filter_dir(fname, strlen(fname), ++depth);
1860
1861                 strlcpy(lastpath, fname, sizeof lastpath);
1862                 lastpath_len = limit - fname;
1863
1864                 *limit = '/';
1865
1866                 copy_links = save_copy_links;
1867                 xfer_dirs = save_xfer_dirs;
1868
1869                 if (!inc_recurse)
1870                         goto done;
1871         }
1872
1873         if (!lastpath_struct)
1874                 goto done; /* dir must have vanished */
1875
1876         len = strlen(limit+1);
1877         memcpy(&relname_list, F_DIR_RELNAMES_P(lastpath_struct), sizeof relname_list);
1878         if (!relname_list) {
1879                 if (!(relname_list = new0(item_list)))
1880                         out_of_memory("send_implied_dirs");
1881                 memcpy(F_DIR_RELNAMES_P(lastpath_struct), &relname_list, sizeof relname_list);
1882         }
1883         rnpp = EXPAND_ITEM_LIST(relname_list, relnamecache *, 32);
1884         if (!(*rnpp = (relnamecache*)new_array(char, sizeof (relnamecache) + len)))
1885                 out_of_memory("send_implied_dirs");
1886         (*rnpp)->name_type = name_type;
1887         strlcpy((*rnpp)->fname, limit+1, len + 1);
1888
1889 done:
1890         filter_list = save_filter_list;
1891 }
1892
1893 static NORETURN void fatal_unsafe_io_error(void)
1894 {
1895         /* This (sadly) can only happen when pushing data because
1896          * the sender does not know about what kind of delete
1897          * is in effect on the receiving side when pulling. */
1898         rprintf(FERROR_XFER, "FATAL I/O ERROR: dying to avoid a --delete-%s issue with a pre-3.0.7 receiver.\n",
1899                 delete_during == 2 ? "delay" : "during");
1900         exit_cleanup(RERR_UNSUPPORTED);
1901 }
1902
1903 static void send1extra(int f, struct file_struct *file, struct file_list *flist)
1904 {
1905         char fbuf[MAXPATHLEN];
1906         item_list *relname_list;
1907         int len, dlen, flags = FLAG_DIVERT_DIRS | FLAG_CONTENT_DIR;
1908         size_t j;
1909
1910         f_name(file, fbuf);
1911         dlen = strlen(fbuf);
1912
1913         if (!change_pathname(file, NULL, 0))
1914                 exit_cleanup(RERR_FILESELECT);
1915
1916         change_local_filter_dir(fbuf, dlen, send_dir_depth);
1917
1918         if (file->flags & FLAG_CONTENT_DIR) {
1919                 if (one_file_system) {
1920                         STRUCT_STAT st;
1921                         if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1922                                 interpret_stat_error(fbuf, True);
1923                                 return;
1924                         }
1925                         filesystem_dev = st.st_dev;
1926                 }
1927                 send_directory(f, flist, fbuf, dlen, flags);
1928         }
1929
1930         if (!relative_paths)
1931                 return;
1932
1933         memcpy(&relname_list, F_DIR_RELNAMES_P(file), sizeof relname_list);
1934         if (!relname_list)
1935                 return;
1936
1937         for (j = 0; j < relname_list->count; j++) {
1938                 char *slash;
1939                 relnamecache *rnp = ((relnamecache**)relname_list->items)[j];
1940                 char name_type = rnp->name_type;
1941
1942                 fbuf[dlen] = '/';
1943                 len = strlcpy(fbuf + dlen + 1, rnp->fname, sizeof fbuf - dlen - 1);
1944                 free(rnp);
1945                 if (len >= (int)sizeof fbuf)
1946                         continue; /* Impossible... */
1947
1948                 slash = strchr(fbuf+dlen+1, '/');
1949                 if (slash) {
1950                         send_implied_dirs(f, flist, fbuf, fbuf+dlen+1, slash, flags, name_type);
1951                         continue;
1952                 }
1953
1954                 if (name_type != NORMAL_NAME) {
1955                         STRUCT_STAT st;
1956                         if (name_type == MISSING_NAME)
1957                                 memset(&st, 0, sizeof st);
1958                         else if (link_stat(fbuf, &st, 1) != 0) {
1959                                 interpret_stat_error(fbuf, True);
1960                                 continue;
1961                         }
1962                         send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR | flags, ALL_FILTERS);
1963                 } else
1964                         send_file_name(f, flist, fbuf, NULL, FLAG_TOP_DIR | flags, ALL_FILTERS);
1965         }
1966
1967         free(relname_list);
1968 }
1969
1970 void send_extra_file_list(int f, int at_least)
1971 {
1972         struct file_list *flist;
1973         int64 start_write;
1974         uint16 prev_flags;
1975         int save_io_error = io_error;
1976
1977         if (flist_eof)
1978                 return;
1979
1980         if (at_least < 0)
1981                 at_least = file_total - file_old_total + 1;
1982
1983         /* Keep sending data until we have the requested number of
1984          * files in the upcoming file-lists. */
1985         while (file_total - file_old_total < at_least) {
1986                 struct file_struct *file = dir_flist->sorted[send_dir_ndx];
1987                 int dir_ndx, dstart = stats.num_dirs;
1988                 const char *pathname = F_PATHNAME(file);
1989                 int32 *dp;
1990
1991                 flist = flist_new(0, "send_extra_file_list");
1992                 start_write = stats.total_written;
1993
1994                 if (unsort_ndx)
1995                         dir_ndx = F_NDX(file);
1996                 else
1997                         dir_ndx = send_dir_ndx;
1998                 write_ndx(f, NDX_FLIST_OFFSET - dir_ndx);
1999                 flist->parent_ndx = send_dir_ndx; /* the sending side must remember the sorted ndx value */
2000
2001                 send1extra(f, file, flist);
2002                 prev_flags = file->flags;
2003                 dp = F_DIR_NODE_P(file);
2004
2005                 /* If there are any duplicate directory names that follow, we
2006                  * send all the dirs together in one file-list.  The dir_flist
2007                  * tree links all the child subdirs onto the last dup dir. */
2008                 while ((dir_ndx = DIR_NEXT_SIBLING(dp)) >= 0
2009                     && dir_flist->sorted[dir_ndx]->flags & FLAG_DUPLICATE) {
2010                         send_dir_ndx = dir_ndx;
2011                         file = dir_flist->sorted[dir_ndx];
2012                         /* Try to avoid some duplicate scanning of identical dirs. */
2013                         if (F_PATHNAME(file) == pathname && prev_flags & FLAG_CONTENT_DIR)
2014                                 file->flags &= ~FLAG_CONTENT_DIR;
2015                         send1extra(f, file, flist);
2016                         prev_flags = file->flags;
2017                         dp = F_DIR_NODE_P(file);
2018                 }
2019
2020                 if (io_error == save_io_error || ignore_errors)
2021                         write_byte(f, 0);
2022                 else if (use_safe_inc_flist) {
2023                         write_shortint(f, XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST);
2024                         write_varint(f, io_error);
2025                 } else {
2026                         if (delete_during)
2027                                 fatal_unsafe_io_error();
2028                         write_byte(f, 0);
2029                 }
2030
2031                 if (need_unsorted_flist) {
2032                         if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2033                                 out_of_memory("send_extra_file_list");
2034                         memcpy(flist->sorted, flist->files,
2035                                flist->used * sizeof (struct file_struct*));
2036                 } else
2037                         flist->sorted = flist->files;
2038
2039                 flist_sort_and_clean(flist, 0);
2040
2041                 add_dirs_to_tree(send_dir_ndx, flist, stats.num_dirs - dstart);
2042                 flist_done_allocating(flist);
2043
2044                 file_total += flist->used;
2045                 stats.flist_size += stats.total_written - start_write;
2046                 stats.num_files += flist->used;
2047                 if (DEBUG_GTE(FLIST, 3))
2048                         output_flist(flist);
2049
2050                 if (DIR_FIRST_CHILD(dp) >= 0) {
2051                         send_dir_ndx = DIR_FIRST_CHILD(dp);
2052                         send_dir_depth++;
2053                 } else {
2054                         while (DIR_NEXT_SIBLING(dp) < 0) {
2055                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
2056                                         write_ndx(f, NDX_FLIST_EOF);
2057                                         flist_eof = 1;
2058                                         if (DEBUG_GTE(FLIST, 3))
2059                                                 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2060                                         change_local_filter_dir(NULL, 0, 0);
2061                                         goto finish;
2062                                 }
2063                                 send_dir_depth--;
2064                                 file = dir_flist->sorted[send_dir_ndx];
2065                                 dp = F_DIR_NODE_P(file);
2066                         }
2067                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
2068                 }
2069         }
2070
2071   finish:
2072         if (io_error != save_io_error && protocol_version == 30 && !ignore_errors)
2073                 send_msg_int(MSG_IO_ERROR, io_error);
2074 }
2075
2076 struct file_list *send_file_list(int f, int argc, char *argv[])
2077 {
2078         static const char *lastdir;
2079         static int lastdir_len = -1;
2080         int len, dirlen;
2081         STRUCT_STAT st;
2082         char *p, *dir;
2083         struct file_list *flist;
2084         struct timeval start_tv, end_tv;
2085         int64 start_write;
2086         int use_ff_fd = 0;
2087         int disable_buffering, reenable_multiplex = -1;
2088         int flags = recurse ? FLAG_CONTENT_DIR : 0;
2089         int reading_remotely = filesfrom_host != NULL;
2090         int rl_flags = (reading_remotely ? 0 : RL_DUMP_COMMENTS)
2091 #ifdef ICONV_OPTION
2092                      | (filesfrom_convert ? RL_CONVERT : 0)
2093 #endif
2094                      | (eol_nulls || reading_remotely ? RL_EOL_NULLS : 0);
2095         int implied_dot_dir = 0;
2096
2097         rprintf(FLOG, "building file list\n");
2098         if (show_filelist_progress)
2099                 start_filelist_progress("building file list");
2100         else if (inc_recurse && INFO_GTE(FLIST, 1) && !am_server)
2101                 rprintf(FCLIENT, "sending incremental file list\n");
2102
2103         start_write = stats.total_written;
2104         gettimeofday(&start_tv, NULL);
2105
2106         if (relative_paths && protocol_version >= 30)
2107                 implied_dirs = 1; /* We send flagged implied dirs */
2108
2109 #ifdef SUPPORT_HARD_LINKS
2110         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
2111                 init_hard_links();
2112 #endif
2113
2114         flist = cur_flist = flist_new(0, "send_file_list");
2115         if (inc_recurse) {
2116                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
2117                 flags |= FLAG_DIVERT_DIRS;
2118         } else
2119                 dir_flist = cur_flist;
2120
2121         disable_buffering = io_start_buffering_out(f);
2122         if (filesfrom_fd >= 0) {
2123                 if (argv[0] && !change_dir(argv[0], CD_NORMAL)) {
2124                         rsyserr(FERROR_XFER, errno, "change_dir %s failed",
2125                                 full_fname(argv[0]));
2126                         exit_cleanup(RERR_FILESELECT);
2127                 }
2128                 if (protocol_version < 31) {
2129                         /* Older protocols send the files-from data w/o packaging
2130                          * it in multiplexed I/O packets, so temporarily switch
2131                          * to buffered I/O to match this behavior. */
2132                         reenable_multiplex = io_end_multiplex_in(MPLX_TO_BUFFERED);
2133                 }
2134                 use_ff_fd = 1;
2135         }
2136
2137         if (!orig_dir)
2138                 orig_dir = strdup(curr_dir);
2139
2140         while (1) {
2141                 char fbuf[MAXPATHLEN], *fn, name_type;
2142
2143                 if (use_ff_fd) {
2144                         if (read_line(filesfrom_fd, fbuf, sizeof fbuf, rl_flags) == 0)
2145                                 break;
2146                         sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
2147                 } else {
2148                         if (argc-- == 0)
2149                                 break;
2150                         strlcpy(fbuf, *argv++, MAXPATHLEN);
2151                         if (sanitize_paths)
2152                                 sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
2153                 }
2154
2155                 len = strlen(fbuf);
2156                 if (relative_paths) {
2157                         /* We clean up fbuf below. */
2158                         name_type = NORMAL_NAME;
2159                 } else if (!len || fbuf[len - 1] == '/') {
2160                         if (len == 2 && fbuf[0] == '.') {
2161                                 /* Turn "./" into just "." rather than "./." */
2162                                 fbuf[--len] = '\0';
2163                         } else {
2164                                 if (len + 1 >= MAXPATHLEN)
2165                                         overflow_exit("send_file_list");
2166                                 fbuf[len++] = '.';
2167                                 fbuf[len] = '\0';
2168                         }
2169                         name_type = DOTDIR_NAME;
2170                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
2171                     && (len == 2 || fbuf[len-3] == '/')) {
2172                         if (len + 2 >= MAXPATHLEN)
2173                                 overflow_exit("send_file_list");
2174                         fbuf[len++] = '/';
2175                         fbuf[len++] = '.';
2176                         fbuf[len] = '\0';
2177                         name_type = DOTDIR_NAME;
2178                 } else if (fbuf[len-1] == '.' && (len == 1 || fbuf[len-2] == '/'))
2179                         name_type = DOTDIR_NAME;
2180                 else
2181                         name_type = NORMAL_NAME;
2182
2183                 dir = NULL;
2184
2185                 if (!relative_paths) {
2186                         p = strrchr(fbuf, '/');
2187                         if (p) {
2188                                 *p = '\0';
2189                                 if (p == fbuf)
2190                                         dir = "/";
2191                                 else
2192                                         dir = fbuf;
2193                                 len -= p - fbuf + 1;
2194                                 fn = p + 1;
2195                         } else
2196                                 fn = fbuf;
2197                 } else {
2198                         if ((p = strstr(fbuf, "/./")) != NULL) {
2199                                 *p = '\0';
2200                                 if (p == fbuf)
2201                                         dir = "/";
2202                                 else {
2203                                         dir = fbuf;
2204                                         clean_fname(dir, 0);
2205                                 }
2206                                 fn = p + 3;
2207                                 while (*fn == '/')
2208                                         fn++;
2209                                 if (!*fn)
2210                                         *--fn = '\0'; /* ensure room for '.' */
2211                         } else
2212                                 fn = fbuf;
2213                         /* A leading ./ can be used in relative mode to affect
2214                          * the dest dir without its name being in the path. */
2215                         if (*fn == '.' && fn[1] == '/' && fn[2] && !implied_dot_dir)
2216                                 implied_dot_dir = -1;
2217                         len = clean_fname(fn, CFN_KEEP_TRAILING_SLASH
2218                                             | CFN_DROP_TRAILING_DOT_DIR);
2219                         if (len == 1) {
2220                                 if (fn[0] == '/') {
2221                                         fn = "/.";
2222                                         len = 2;
2223                                         name_type = DOTDIR_NAME;
2224                                 } else if (fn[0] == '.')
2225                                         name_type = DOTDIR_NAME;
2226                         } else if (fn[len-1] == '/') {
2227                                 fn[--len] = '\0';
2228                                 if (len == 1 && *fn == '.')
2229                                         name_type = DOTDIR_NAME;
2230                                 else
2231                                         name_type = SLASH_ENDING_NAME;
2232                         }
2233                         /* Reject a ".." dir in the active part of the path. */
2234                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
2235                                 if ((p[2] == '/' || p[2] == '\0')
2236                                  && (p == fn || p[-1] == '/')) {
2237                                         rprintf(FERROR,
2238                                             "found \"..\" dir in relative path: %s\n",
2239                                             fn);
2240                                         exit_cleanup(RERR_SYNTAX);
2241                                 }
2242                         }
2243                 }
2244
2245                 if (!*fn) {
2246                         len = 1;
2247                         fn = ".";
2248                         name_type = DOTDIR_NAME;
2249                 }
2250
2251                 dirlen = dir ? strlen(dir) : 0;
2252                 if (dirlen != lastdir_len || memcmp(lastdir, dir, dirlen) != 0) {
2253                         if (!change_pathname(NULL, dir, -dirlen))
2254                                 goto bad_path;
2255                         lastdir = pathname;
2256                         lastdir_len = pathname_len;
2257                 } else if (!change_pathname(NULL, lastdir, lastdir_len)) {
2258                     bad_path:
2259                         if (implied_dot_dir < 0)
2260                                 implied_dot_dir = 0;
2261                         continue;
2262                 }
2263
2264                 if (implied_dot_dir < 0) {
2265                         implied_dot_dir = 1;
2266                         send_file_name(f, flist, ".", NULL, (flags | FLAG_IMPLIED_DIR) & ~FLAG_CONTENT_DIR, ALL_FILTERS);
2267                 }
2268
2269                 if (fn != fbuf)
2270                         memmove(fbuf, fn, len + 1);
2271
2272                 if (link_stat(fbuf, &st, copy_dirlinks || name_type != NORMAL_NAME) != 0
2273                  || (name_type != DOTDIR_NAME && is_excluded(fbuf, S_ISDIR(st.st_mode) != 0, SERVER_FILTERS))
2274                  || (relative_paths && path_is_daemon_excluded(fbuf, 1))) {
2275                         if (errno != ENOENT || missing_args == 0) {
2276                                 /* This is a transfer error, but inhibit deletion
2277                                  * only if we might be omitting an existing file. */
2278                                 if (errno != ENOENT)
2279                                         io_error |= IOERR_GENERAL;
2280                                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
2281                                         full_fname(fbuf));
2282                                 continue;
2283                         } else if (missing_args == 1) {
2284                                 /* Just ignore the arg. */
2285                                 continue;
2286                         } else /* (missing_args == 2) */ {
2287                                 /* Send the arg as a "missing" entry with
2288                                  * mode 0, which tells the generator to delete it. */
2289                                 memset(&st, 0, sizeof st);
2290                         }
2291                 }
2292
2293                 /* A dot-dir should not be excluded! */
2294                 if (name_type != DOTDIR_NAME && st.st_mode != 0
2295                  && is_excluded(fbuf, S_ISDIR(st.st_mode) != 0, ALL_FILTERS))
2296                         continue;
2297
2298                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
2299                         rprintf(FINFO, "skipping directory %s\n", fbuf);
2300                         continue;
2301                 }
2302
2303                 if (inc_recurse && relative_paths && *fbuf) {
2304                         if ((p = strchr(fbuf+1, '/')) != NULL) {
2305                                 if (p - fbuf == 1 && *fbuf == '.') {
2306                                         if ((fn = strchr(p+1, '/')) != NULL)
2307                                                 p = fn;
2308                                 } else
2309                                         fn = p;
2310                                 send_implied_dirs(f, flist, fbuf, fbuf, p, flags,
2311                                                   IS_MISSING_FILE(st) ? MISSING_NAME : name_type);
2312                                 if (fn == p)
2313                                         continue;
2314                         }
2315                 } else if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
2316                         /* Send the implied directories at the start of the
2317                          * source spec, so we get their permissions right. */
2318                         send_implied_dirs(f, flist, fbuf, fbuf, p, flags, 0);
2319                 }
2320
2321                 if (one_file_system)
2322                         filesystem_dev = st.st_dev;
2323
2324                 if (recurse || (xfer_dirs && name_type != NORMAL_NAME)) {
2325                         struct file_struct *file;
2326                         file = send_file_name(f, flist, fbuf, &st,
2327                                               FLAG_TOP_DIR | FLAG_CONTENT_DIR | flags,
2328                                               NO_FILTERS);
2329                         if (!file)
2330                                 continue;
2331                         if (inc_recurse) {
2332                                 if (name_type == DOTDIR_NAME) {
2333                                         if (send_dir_depth < 0) {
2334                                                 send_dir_depth = 0;
2335                                                 change_local_filter_dir(fbuf, len, send_dir_depth);
2336                                         }
2337                                         send_directory(f, flist, fbuf, len, flags);
2338                                 }
2339                         } else
2340                                 send_if_directory(f, flist, file, fbuf, len, flags);
2341                 } else
2342                         send_file_name(f, flist, fbuf, &st, flags, NO_FILTERS);
2343         }
2344
2345         if (reenable_multiplex >= 0)
2346                 io_start_multiplex_in(reenable_multiplex);
2347
2348         gettimeofday(&end_tv, NULL);
2349         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2350                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2351         if (stats.flist_buildtime == 0)
2352                 stats.flist_buildtime = 1;
2353         start_tv = end_tv;
2354
2355         /* Indicate end of file list */
2356         if (io_error == 0 || ignore_errors)
2357                 write_byte(f, 0);
2358         else if (use_safe_inc_flist) {
2359                 write_shortint(f, XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST);
2360                 write_varint(f, io_error);
2361         } else {
2362                 if (delete_during && inc_recurse)
2363                         fatal_unsafe_io_error();
2364                 write_byte(f, 0);
2365         }
2366
2367 #ifdef SUPPORT_HARD_LINKS
2368         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
2369                 idev_destroy();
2370 #endif
2371
2372         if (show_filelist_progress)
2373                 finish_filelist_progress(flist);
2374
2375         gettimeofday(&end_tv, NULL);
2376         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2377                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2378
2379         /* When converting names, both sides keep an unsorted file-list array
2380          * because the names will differ on the sending and receiving sides
2381          * (both sides will use the unsorted index number for each item). */
2382
2383         /* Sort the list without removing any duplicates.  This allows the
2384          * receiving side to ask for whatever name it kept.  For incremental
2385          * recursion mode, the sender marks duplicate dirs so that it can
2386          * send them together in a single file-list. */
2387         if (need_unsorted_flist) {
2388                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2389                         out_of_memory("send_file_list");
2390                 memcpy(flist->sorted, flist->files,
2391                        flist->used * sizeof (struct file_struct*));
2392         } else
2393                 flist->sorted = flist->files;
2394         flist_sort_and_clean(flist, 0);
2395         file_total += flist->used;
2396         file_old_total += flist->used;
2397
2398         if (numeric_ids <= 0 && !inc_recurse)
2399                 send_id_list(f);
2400
2401         /* send the io_error flag */
2402         if (protocol_version < 30)
2403                 write_int(f, ignore_errors ? 0 : io_error);
2404         else if (!use_safe_inc_flist && io_error && !ignore_errors)
2405                 send_msg_int(MSG_IO_ERROR, io_error);
2406
2407         if (disable_buffering)
2408                 io_end_buffering_out(IOBUF_FREE_BUFS);
2409
2410         stats.flist_size = stats.total_written - start_write;
2411         stats.num_files = flist->used;
2412
2413         if (DEBUG_GTE(FLIST, 3))
2414                 output_flist(flist);
2415
2416         if (DEBUG_GTE(FLIST, 2))
2417                 rprintf(FINFO, "send_file_list done\n");
2418
2419         if (inc_recurse) {
2420                 send_dir_depth = 1;
2421                 add_dirs_to_tree(-1, flist, stats.num_dirs);
2422                 if (!file_total || strcmp(flist->sorted[flist->low]->basename, ".") != 0)
2423                         flist->parent_ndx = -1;
2424                 flist_done_allocating(flist);
2425                 if (send_dir_ndx < 0) {
2426                         write_ndx(f, NDX_FLIST_EOF);
2427                         flist_eof = 1;
2428                         if (DEBUG_GTE(FLIST, 3))
2429                                 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2430                 }
2431                 else if (file_total == 1) {
2432                         /* If we're creating incremental file-lists and there
2433                          * was just 1 item in the first file-list, send 1 more
2434                          * file-list to check if this is a 1-file xfer. */
2435                         send_extra_file_list(f, 1);
2436                 }
2437         } else {
2438                 flist_eof = 1;
2439                 if (DEBUG_GTE(FLIST, 3))
2440                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2441         }
2442
2443         return flist;
2444 }
2445
2446 struct file_list *recv_file_list(int f, int dir_ndx)
2447 {
2448         const char *good_dirname = NULL;
2449         struct file_list *flist;
2450         int dstart, flags;
2451         int64 start_read;
2452
2453         if (!first_flist) {
2454                 if (show_filelist_progress)
2455                         start_filelist_progress("receiving file list");
2456                 else if (inc_recurse && INFO_GTE(FLIST, 1) && !am_server)
2457                         rprintf(FCLIENT, "receiving incremental file list\n");
2458                 rprintf(FLOG, "receiving file list\n");
2459                 if (usermap)
2460                         parse_name_map(usermap, True);
2461                 if (groupmap)
2462                         parse_name_map(groupmap, False);
2463         }
2464
2465         start_read = stats.total_read;
2466
2467 #ifdef SUPPORT_HARD_LINKS
2468         if (preserve_hard_links && !first_flist)
2469                 init_hard_links();
2470 #endif
2471
2472         flist = flist_new(0, "recv_file_list");
2473
2474         if (inc_recurse) {
2475                 if (flist->ndx_start == 1)
2476                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
2477                 dstart = dir_flist->used;
2478         } else {
2479                 dir_flist = flist;
2480                 dstart = 0;
2481         }
2482
2483         while ((flags = read_byte(f)) != 0) {
2484                 struct file_struct *file;
2485
2486                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
2487                         flags |= read_byte(f) << 8;
2488
2489                 if (flags == (XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST)) {
2490                         int err;
2491                         if (!use_safe_inc_flist) {
2492                                 rprintf(FERROR, "Invalid flist flag: %x\n", flags);
2493                                 exit_cleanup(RERR_PROTOCOL);
2494                         }
2495                         err = read_varint(f);
2496                         if (!ignore_errors)
2497                                 io_error |= err;
2498                         break;
2499                 }
2500
2501                 flist_expand(flist, 1);
2502                 file = recv_file_entry(f, flist, flags);
2503
2504                 if (inc_recurse) {
2505                         static const char empty_dir[] = "\0";
2506                         const char *cur_dir = file->dirname ? file->dirname : empty_dir;
2507                         if (relative_paths && *cur_dir == '/')
2508                                 cur_dir++;
2509                         if (cur_dir != good_dirname) {
2510                                 const char *d = dir_ndx >= 0 ? f_name(dir_flist->files[dir_ndx], NULL) : empty_dir;
2511                                 if (strcmp(cur_dir, d) != 0) {
2512                                         rprintf(FERROR,
2513                                                 "ABORTING due to invalid path from sender: %s/%s\n",
2514                                                 cur_dir, file->basename);
2515                                         exit_cleanup(RERR_PROTOCOL);
2516                                 }
2517                                 good_dirname = cur_dir;
2518                         }
2519                 }
2520
2521                 if (S_ISREG(file->mode)) {
2522                         /* Already counted */
2523                 } else if (S_ISDIR(file->mode)) {
2524                         if (inc_recurse) {
2525                                 flist_expand(dir_flist, 1);
2526                                 dir_flist->files[dir_flist->used++] = file;
2527                         }
2528                         stats.num_dirs++;
2529                 } else if (S_ISLNK(file->mode))
2530                         stats.num_symlinks++;
2531                 else if (IS_DEVICE(file->mode))
2532                         stats.num_symlinks++;
2533                 else
2534                         stats.num_specials++;
2535
2536                 flist->files[flist->used++] = file;
2537
2538                 maybe_emit_filelist_progress(flist->used);
2539
2540                 if (DEBUG_GTE(FLIST, 2)) {
2541                         char *name = f_name(file, NULL);
2542                         rprintf(FINFO, "recv_file_name(%s)\n", NS(name));
2543                 }
2544         }
2545         file_total += flist->used;
2546
2547         if (DEBUG_GTE(FLIST, 2))
2548                 rprintf(FINFO, "received %d names\n", flist->used);
2549
2550         if (show_filelist_progress)
2551                 finish_filelist_progress(flist);
2552
2553         if (need_unsorted_flist) {
2554                 /* Create an extra array of index pointers that we can sort for
2555                  * the generator's use (for wading through the files in sorted
2556                  * order and for calling flist_find()).  We keep the "files"
2557                  * list unsorted for our exchange of index numbers with the
2558                  * other side (since their names may not sort the same). */
2559                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2560                         out_of_memory("recv_file_list");
2561                 memcpy(flist->sorted, flist->files,
2562                        flist->used * sizeof (struct file_struct*));
2563                 if (inc_recurse && dir_flist->used > dstart) {
2564                         static int dir_flist_malloced = 0;
2565                         if (dir_flist_malloced < dir_flist->malloced) {
2566                                 dir_flist->sorted = realloc_array(dir_flist->sorted,
2567                                                         struct file_struct *,
2568                                                         dir_flist->malloced);
2569                                 dir_flist_malloced = dir_flist->malloced;
2570                         }
2571                         memcpy(dir_flist->sorted + dstart, dir_flist->files + dstart,
2572                                (dir_flist->used - dstart) * sizeof (struct file_struct*));
2573                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2574                 }
2575         } else {
2576                 flist->sorted = flist->files;
2577                 if (inc_recurse && dir_flist->used > dstart) {
2578                         dir_flist->sorted = dir_flist->files;
2579                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2580                 }
2581         }
2582
2583         if (inc_recurse)
2584                 flist_done_allocating(flist);
2585         else if (f >= 0) {
2586                 recv_id_list(f, flist);
2587                 flist_eof = 1;
2588                 if (DEBUG_GTE(FLIST, 3))
2589                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2590         }
2591
2592         /* The --relative option sends paths with a leading slash, so we need
2593          * to specify the strip_root option here.  We rejected leading slashes
2594          * for a non-relative transfer in recv_file_entry(). */
2595         flist_sort_and_clean(flist, relative_paths);
2596
2597         if (protocol_version < 30) {
2598                 /* Recv the io_error flag */
2599                 int err = read_int(f);
2600                 if (!ignore_errors)
2601                         io_error |= err;
2602         } else if (inc_recurse && flist->ndx_start == 1) {
2603                 if (!file_total || strcmp(flist->sorted[flist->low]->basename, ".") != 0)
2604                         flist->parent_ndx = -1;
2605         }
2606
2607         if (DEBUG_GTE(FLIST, 3))
2608                 output_flist(flist);
2609
2610         if (DEBUG_GTE(FLIST, 2))
2611                 rprintf(FINFO, "recv_file_list done\n");
2612
2613         stats.flist_size += stats.total_read - start_read;
2614         stats.num_files += flist->used;
2615
2616         return flist;
2617 }
2618
2619 /* This is only used once by the receiver if the very first file-list
2620  * has exactly one item in it. */
2621 void recv_additional_file_list(int f)
2622 {
2623         struct file_list *flist;
2624         int ndx = read_ndx(f);
2625         if (ndx == NDX_FLIST_EOF) {
2626                 flist_eof = 1;
2627                 if (DEBUG_GTE(FLIST, 3))
2628                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2629                 change_local_filter_dir(NULL, 0, 0);
2630         } else {
2631                 ndx = NDX_FLIST_OFFSET - ndx;
2632                 if (ndx < 0 || ndx >= dir_flist->used) {
2633                         ndx = NDX_FLIST_OFFSET - ndx;
2634                         rprintf(FERROR,
2635                                 "[%s] Invalid dir index: %d (%d - %d)\n",
2636                                 who_am_i(), ndx, NDX_FLIST_OFFSET,
2637                                 NDX_FLIST_OFFSET - dir_flist->used + 1);
2638                         exit_cleanup(RERR_PROTOCOL);
2639                 }
2640                 if (DEBUG_GTE(FLIST, 3)) {
2641                         rprintf(FINFO, "[%s] receiving flist for dir %d\n",
2642                                 who_am_i(), ndx);
2643                 }
2644                 flist = recv_file_list(f, ndx);
2645                 flist->parent_ndx = ndx;
2646         }
2647 }
2648
2649 /* Search for an identically-named item in the file list.  Note that the
2650  * items must agree in their directory-ness, or no match is returned. */
2651 int flist_find(struct file_list *flist, struct file_struct *f)
2652 {
2653         int low = flist->low, high = flist->high;
2654         int diff, mid, mid_up;
2655
2656         while (low <= high) {
2657                 mid = (low + high) / 2;
2658                 if (F_IS_ACTIVE(flist->sorted[mid]))
2659                         mid_up = mid;
2660                 else {
2661                         /* Scan for the next non-empty entry using the cached
2662                          * distance values.  If the value isn't fully up-to-
2663                          * date, update it. */
2664                         mid_up = mid + F_DEPTH(flist->sorted[mid]);
2665                         if (!F_IS_ACTIVE(flist->sorted[mid_up])) {
2666                                 do {
2667                                     mid_up += F_DEPTH(flist->sorted[mid_up]);
2668                                 } while (!F_IS_ACTIVE(flist->sorted[mid_up]));
2669                                 F_DEPTH(flist->sorted[mid]) = mid_up - mid;
2670                         }
2671                         if (mid_up > high) {
2672                                 /* If there's nothing left above us, set high to
2673                                  * a non-empty entry below us and continue. */
2674                                 high = mid - (int)flist->sorted[mid]->len32;
2675                                 if (!F_IS_ACTIVE(flist->sorted[high])) {
2676                                         do {
2677                                             high -= (int)flist->sorted[high]->len32;
2678                                         } while (!F_IS_ACTIVE(flist->sorted[high]));
2679                                         flist->sorted[mid]->len32 = mid - high;
2680                                 }
2681                                 continue;
2682                         }
2683                 }
2684                 diff = f_name_cmp(flist->sorted[mid_up], f);
2685                 if (diff == 0) {
2686                         if (protocol_version < 29
2687                             && S_ISDIR(flist->sorted[mid_up]->mode)
2688                             != S_ISDIR(f->mode))
2689                                 return -1;
2690                         return mid_up;
2691                 }
2692                 if (diff < 0)
2693                         low = mid_up + 1;
2694                 else
2695                         high = mid - 1;
2696         }
2697         return -1;
2698 }
2699
2700 /* Search for a name in the file list.  You must specify want_dir_match as:
2701  * 1=match directories, 0=match non-directories, or -1=match either. */
2702 int flist_find_name(struct file_list *flist, const char *fname, int want_dir_match)
2703 {
2704         struct { /* We have to create a temporary file_struct for the search. */
2705                 struct file_struct f;
2706                 char name_space[MAXPATHLEN];
2707         } t;
2708         char fbuf[MAXPATHLEN];
2709         const char *slash = strrchr(fname, '/');
2710         const char *basename = slash ? slash+1 : fname;
2711
2712         memset(&t.f, 0, FILE_STRUCT_LEN);
2713         memcpy((void *)t.f.basename, basename, strlen(basename)+1);
2714
2715         if (slash) {
2716                 strlcpy(fbuf, fname, slash - fname + 1);
2717                 t.f.dirname = fbuf;
2718         } else
2719                 t.f.dirname = NULL;
2720
2721         t.f.mode = want_dir_match > 0 ? S_IFDIR : S_IFREG;
2722
2723         if (want_dir_match < 0)
2724                 return flist_find_ignore_dirness(flist, &t.f);
2725         return flist_find(flist, &t.f);
2726 }
2727
2728 /* Search for an identically-named item in the file list.  Differs from
2729  * flist_find in that an item that agrees with "f" in directory-ness is
2730  * preferred but one that does not is still found. */
2731 int flist_find_ignore_dirness(struct file_list *flist, struct file_struct *f)
2732 {
2733         mode_t save_mode;
2734         int ndx;
2735
2736         /* First look for an item that agrees in directory-ness. */
2737         ndx = flist_find(flist, f);
2738         if (ndx >= 0)
2739                 return ndx;
2740
2741         /* Temporarily flip f->mode to look for an item of opposite
2742          * directory-ness. */
2743         save_mode = f->mode;
2744         f->mode = S_ISDIR(f->mode) ? S_IFREG : S_IFDIR;
2745         ndx = flist_find(flist, f);
2746         f->mode = save_mode;
2747         return ndx;
2748 }
2749
2750 /*
2751  * Free up any resources a file_struct has allocated
2752  * and clear the file.
2753  */
2754 void clear_file(struct file_struct *file)
2755 {
2756         /* The +1 zeros out the first char of the basename. */
2757         memset(file, 0, FILE_STRUCT_LEN + 1);
2758         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
2759          * entry.  Likewise for len32 in the opposite direction.  We assume
2760          * that we're alone for now since flist_find() will adjust the counts
2761          * it runs into that aren't up-to-date. */
2762         file->len32 = F_DEPTH(file) = 1;
2763 }
2764
2765 /* Allocate a new file list. */
2766 struct file_list *flist_new(int flags, char *msg)
2767 {
2768         struct file_list *flist;
2769
2770         if (!(flist = new0(struct file_list)))
2771                 out_of_memory(msg);
2772
2773         if (flags & FLIST_TEMP) {
2774                 if (!(flist->file_pool = pool_create(SMALL_EXTENT, 0,
2775                                                      out_of_memory,
2776                                                      POOL_INTERN)))
2777                         out_of_memory(msg);
2778         } else {
2779                 /* This is a doubly linked list with prev looping back to
2780                  * the end of the list, but the last next pointer is NULL. */
2781                 if (!first_flist) {
2782                         flist->file_pool = pool_create(NORMAL_EXTENT, 0,
2783                                                        out_of_memory,
2784                                                        POOL_INTERN);
2785                         if (!flist->file_pool)
2786                                 out_of_memory(msg);
2787
2788                         flist->ndx_start = flist->flist_num = inc_recurse ? 1 : 0;
2789
2790                         first_flist = cur_flist = flist->prev = flist;
2791                 } else {
2792                         struct file_list *prev = first_flist->prev;
2793
2794                         flist->file_pool = first_flist->file_pool;
2795
2796                         flist->ndx_start = prev->ndx_start + prev->used + 1;
2797                         flist->flist_num = prev->flist_num + 1;
2798
2799                         flist->prev = prev;
2800                         prev->next = first_flist->prev = flist;
2801                 }
2802                 flist->pool_boundary = pool_boundary(flist->file_pool, 0);
2803                 flist_cnt++;
2804         }
2805
2806         return flist;
2807 }
2808
2809 /* Free up all elements in a flist. */
2810 void flist_free(struct file_list *flist)
2811 {
2812         if (!flist->prev) {
2813                 /* Was FLIST_TEMP dir-list. */
2814         } else if (flist == flist->prev) {
2815                 first_flist = cur_flist = NULL;
2816                 file_total = 0;
2817                 flist_cnt = 0;
2818         } else {
2819                 if (flist == cur_flist)
2820                         cur_flist = flist->next;
2821                 if (flist == first_flist)
2822                         first_flist = first_flist->next;
2823                 else {
2824                         flist->prev->next = flist->next;
2825                         if (!flist->next)
2826                                 flist->next = first_flist;
2827                 }
2828                 flist->next->prev = flist->prev;
2829                 file_total -= flist->used;
2830                 flist_cnt--;
2831         }
2832
2833         if (!flist->prev || !flist_cnt)
2834                 pool_destroy(flist->file_pool);
2835         else
2836                 pool_free_old(flist->file_pool, flist->pool_boundary);
2837
2838         if (flist->sorted && flist->sorted != flist->files)
2839                 free(flist->sorted);
2840         free(flist->files);
2841         free(flist);
2842 }
2843
2844 /* This routine ensures we don't have any duplicate names in our file list.
2845  * duplicate names can cause corruption because of the pipelining. */
2846 static void flist_sort_and_clean(struct file_list *flist, int strip_root)
2847 {
2848         char fbuf[MAXPATHLEN];
2849         int i, prev_i;
2850
2851         if (!flist)
2852                 return;
2853         if (flist->used == 0) {
2854                 flist->high = -1;
2855                 flist->low = 0;
2856                 return;
2857         }
2858
2859         fsort(flist->sorted, flist->used);
2860
2861         if (!am_sender || inc_recurse) {
2862                 for (i = prev_i = 0; i < flist->used; i++) {
2863                         if (F_IS_ACTIVE(flist->sorted[i])) {
2864                                 prev_i = i;
2865                                 break;
2866                         }
2867                 }
2868                 flist->low = prev_i;
2869         } else {
2870                 i = prev_i = flist->used - 1;
2871                 flist->low = 0;
2872         }
2873
2874         while (++i < flist->used) {
2875                 int j;
2876                 struct file_struct *file = flist->sorted[i];
2877
2878                 if (!F_IS_ACTIVE(file))
2879                         continue;
2880                 if (f_name_cmp(file, flist->sorted[prev_i]) == 0)
2881                         j = prev_i;
2882                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
2883                         int save_mode = file->mode;
2884                         /* Make sure that this directory doesn't duplicate a
2885                          * non-directory earlier in the list. */
2886                         flist->high = prev_i;
2887                         file->mode = S_IFREG;
2888                         j = flist_find(flist, file);
2889                         file->mode = save_mode;
2890                 } else
2891                         j = -1;
2892                 if (j >= 0) {
2893                         int keep, drop;
2894                         /* If one is a dir and the other is not, we want to
2895                          * keep the dir because it might have contents in the
2896                          * list.  Otherwise keep the first one. */
2897                         if (S_ISDIR(file->mode)) {
2898                                 struct file_struct *fp = flist->sorted[j];
2899                                 if (!S_ISDIR(fp->mode))
2900                                         keep = i, drop = j;
2901                                 else {
2902                                         if (am_sender)
2903                                                 file->flags |= FLAG_DUPLICATE;
2904                                         else { /* Make sure we merge our vital flags. */
2905                                                 fp->flags |= file->flags & (FLAG_TOP_DIR|FLAG_CONTENT_DIR);
2906                                                 fp->flags &= file->flags | ~FLAG_IMPLIED_DIR;
2907                                         }
2908                                         keep = j, drop = i;
2909                                 }
2910                         } else
2911                                 keep = j, drop = i;
2912
2913                         if (!am_sender) {
2914                                 if (DEBUG_GTE(DUP, 1)) {
2915                                         rprintf(FINFO,
2916                                             "removing duplicate name %s from file list (%d)\n",
2917                                             f_name(file, fbuf), drop + flist->ndx_start);
2918                                 }
2919                                 clear_file(flist->sorted[drop]);
2920                         }
2921
2922                         if (keep == i) {
2923                                 if (flist->low == drop) {
2924                                         for (j = drop + 1;
2925                                              j < i && !F_IS_ACTIVE(flist->sorted[j]);
2926                                              j++) {}
2927                                         flist->low = j;
2928                                 }
2929                                 prev_i = i;
2930                         }
2931                 } else
2932                         prev_i = i;
2933         }
2934         flist->high = prev_i;
2935
2936         if (strip_root) {
2937                 /* We need to strip off the leading slashes for relative
2938                  * paths, but this must be done _after_ the sorting phase. */
2939                 for (i = flist->low; i <= flist->high; i++) {
2940                         struct file_struct *file = flist->sorted[i];
2941
2942                         if (!file->dirname)
2943                                 continue;
2944                         while (*file->dirname == '/')
2945                                 file->dirname++;
2946                         if (!*file->dirname)
2947                                 file->dirname = NULL;
2948                 }
2949         }
2950
2951         if (prune_empty_dirs && !am_sender) {
2952                 int j, prev_depth = 0;
2953
2954                 prev_i = 0; /* It's OK that this isn't really true. */
2955
2956                 for (i = flist->low; i <= flist->high; i++) {
2957                         struct file_struct *fp, *file = flist->sorted[i];
2958
2959                         /* This temporarily abuses the F_DEPTH() value for a
2960                          * directory that is in a chain that might get pruned.
2961                          * We restore the old value if it gets a reprieve. */
2962                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2963                                 /* Dump empty dirs when coming back down. */
2964                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2965                                         fp = flist->sorted[prev_i];
2966                                         if (F_DEPTH(fp) >= 0)
2967                                                 break;
2968                                         prev_i = -F_DEPTH(fp)-1;
2969                                         clear_file(fp);
2970                                 }
2971                                 prev_depth = F_DEPTH(file);
2972                                 if (is_excluded(f_name(file, fbuf), 1, ALL_FILTERS)) {
2973                                         /* Keep dirs through this dir. */
2974                                         for (j = prev_depth-1; ; j--) {
2975                                                 fp = flist->sorted[prev_i];
2976                                                 if (F_DEPTH(fp) >= 0)
2977                                                         break;
2978                                                 prev_i = -F_DEPTH(fp)-1;
2979                                                 F_DEPTH(fp) = j;
2980                                         }
2981                                 } else
2982                                         F_DEPTH(file) = -prev_i-1;
2983                                 prev_i = i;
2984                         } else {
2985                                 /* Keep dirs through this non-dir. */
2986                                 for (j = prev_depth; ; j--) {
2987                                         fp = flist->sorted[prev_i];
2988                                         if (F_DEPTH(fp) >= 0)
2989                                                 break;
2990                                         prev_i = -F_DEPTH(fp)-1;
2991                                         F_DEPTH(fp) = j;
2992                                 }
2993                         }
2994                 }
2995                 /* Dump all remaining empty dirs. */
2996                 while (1) {
2997                         struct file_struct *fp = flist->sorted[prev_i];
2998                         if (F_DEPTH(fp) >= 0)
2999                                 break;
3000                         prev_i = -F_DEPTH(fp)-1;
3001                         clear_file(fp);
3002                 }
3003
3004                 for (i = flist->low; i <= flist->high; i++) {
3005                         if (F_IS_ACTIVE(flist->sorted[i]))
3006                                 break;
3007                 }
3008                 flist->low = i;
3009                 for (i = flist->high; i >= flist->low; i--) {
3010                         if (F_IS_ACTIVE(flist->sorted[i]))
3011                                 break;
3012                 }
3013                 flist->high = i;
3014         }
3015 }
3016
3017 static void output_flist(struct file_list *flist)
3018 {
3019         char uidbuf[16], gidbuf[16], depthbuf[16];
3020         struct file_struct *file;
3021         const char *root, *dir, *slash, *name, *trail;
3022         const char *who = who_am_i();
3023         int i;
3024
3025         rprintf(FINFO, "[%s] flist start=%d, used=%d, low=%d, high=%d\n",
3026                 who, flist->ndx_start, flist->used, flist->low, flist->high);
3027         for (i = 0; i < flist->used; i++) {
3028                 file = flist->files[i];
3029                 if ((am_root || am_sender) && uid_ndx) {
3030                         snprintf(uidbuf, sizeof uidbuf, " uid=%u",
3031                                  F_OWNER(file));
3032                 } else
3033                         *uidbuf = '\0';
3034                 if (gid_ndx) {
3035                         static char parens[] = "(\0)\0\0\0";
3036                         char *pp = parens + (file->flags & FLAG_SKIP_GROUP ? 0 : 3);
3037                         snprintf(gidbuf, sizeof gidbuf, " gid=%s%u%s",
3038                                  pp, F_GROUP(file), pp + 2);
3039                 } else
3040                         *gidbuf = '\0';
3041                 if (!am_sender)
3042                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
3043                 if (F_IS_ACTIVE(file)) {
3044                         root = am_sender ? NS(F_PATHNAME(file)) : depthbuf;
3045                         if ((dir = file->dirname) == NULL)
3046                                 dir = slash = "";
3047                         else
3048                                 slash = "/";
3049                         name = file->basename;
3050                         trail = S_ISDIR(file->mode) ? "/" : "";
3051                 } else
3052                         root = dir = slash = name = trail = "";
3053                 rprintf(FINFO,
3054                         "[%s] i=%d %s %s%s%s%s mode=0%o len=%s%s%s flags=%x\n",
3055                         who, i + flist->ndx_start,
3056                         root, dir, slash, name, trail,
3057                         (int)file->mode, comma_num(F_LENGTH(file)),
3058                         uidbuf, gidbuf, file->flags);
3059         }
3060 }
3061
3062 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
3063 enum fnc_type { t_PATH, t_ITEM };
3064
3065 static int found_prefix;
3066
3067 /* Compare the names of two file_struct entities, similar to how strcmp()
3068  * would do if it were operating on the joined strings.
3069  *
3070  * Some differences beginning with protocol_version 29: (1) directory names
3071  * are compared with an assumed trailing slash so that they compare in a
3072  * way that would cause them to sort immediately prior to any content they
3073  * may have; (2) a directory of any name compares after a non-directory of
3074  * any name at the same depth; (3) a directory with name "." compares prior
3075  * to anything else.  These changes mean that a directory and a non-dir
3076  * with the same name will not compare as equal (protocol_version >= 29).
3077  *
3078  * The dirname component can be an empty string, but the basename component
3079  * cannot (and never is in the current codebase).  The basename component
3080  * may be NULL (for a removed item), in which case it is considered to be
3081  * after any existing item. */
3082 int f_name_cmp(const struct file_struct *f1, const struct file_struct *f2)
3083 {
3084         int dif;
3085         const uchar *c1, *c2;
3086         enum fnc_state state1, state2;
3087         enum fnc_type type1, type2;
3088         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
3089
3090         if (!f1 || !F_IS_ACTIVE(f1)) {
3091                 if (!f2 || !F_IS_ACTIVE(f2))
3092                         return 0;
3093                 return -1;
3094         }
3095         if (!f2 || !F_IS_ACTIVE(f2))
3096                 return 1;
3097
3098         c1 = (uchar*)f1->dirname;
3099         c2 = (uchar*)f2->dirname;
3100         if (c1 == c2)
3101                 c1 = c2 = NULL;
3102         if (!c1) {
3103                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
3104                 c1 = (const uchar*)f1->basename;
3105                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
3106                         type1 = t_ITEM;
3107                         state1 = s_TRAILING;
3108                         c1 = (uchar*)"";
3109                 } else
3110                         state1 = s_BASE;
3111         } else {
3112                 type1 = t_path;
3113                 state1 = s_DIR;
3114         }
3115         if (!c2) {
3116                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
3117                 c2 = (const uchar*)f2->basename;
3118                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
3119                         type2 = t_ITEM;
3120                         state2 = s_TRAILING;
3121                         c2 = (uchar*)"";
3122                 } else
3123                         state2 = s_BASE;
3124         } else {
3125                 type2 = t_path;
3126                 state2 = s_DIR;
3127         }
3128
3129         if (type1 != type2)
3130                 return type1 == t_PATH ? 1 : -1;
3131
3132         do {
3133                 if (!*c1) {
3134                         switch (state1) {
3135                         case s_DIR:
3136                                 state1 = s_SLASH;
3137                                 c1 = (uchar*)"/";
3138                                 break;
3139                         case s_SLASH:
3140                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
3141                                 c1 = (const uchar*)f1->basename;
3142                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
3143                                         type1 = t_ITEM;
3144                                         state1 = s_TRAILING;
3145                                         c1 = (uchar*)"";
3146                                 } else
3147                                         state1 = s_BASE;
3148                                 break;
3149                         case s_BASE:
3150                                 state1 = s_TRAILING;
3151                                 if (type1 == t_PATH) {
3152                                         c1 = (uchar*)"/";
3153                                         break;
3154                                 }
3155                                 /* FALL THROUGH */
3156                         case s_TRAILING:
3157                                 type1 = t_ITEM;
3158                                 break;
3159                         }
3160                         if (*c2 && type1 != type2)
3161                                 return type1 == t_PATH ? 1 : -1;
3162                 }
3163                 if (!*c2) {
3164                         switch (state2) {
3165                         case s_DIR:
3166                                 state2 = s_SLASH;
3167                                 c2 = (uchar*)"/";
3168                                 break;
3169                         case s_SLASH:
3170                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
3171                                 c2 = (const uchar*)f2->basename;
3172                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
3173                                         type2 = t_ITEM;
3174                                         state2 = s_TRAILING;
3175                                         c2 = (uchar*)"";
3176                                 } else
3177                                         state2 = s_BASE;
3178                                 break;
3179                         case s_BASE:
3180                                 state2 = s_TRAILING;
3181                                 if (type2 == t_PATH) {
3182                                         c2 = (uchar*)"/";
3183                                         break;
3184                                 }
3185                                 /* FALL THROUGH */
3186                         case s_TRAILING:
3187                                 found_prefix = 1;
3188                                 if (!*c1)
3189                                         return 0;
3190                                 type2 = t_ITEM;
3191                                 break;
3192                         }
3193                         if (type1 != type2)
3194                                 return type1 == t_PATH ? 1 : -1;
3195                 }
3196         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
3197
3198         return dif;
3199 }
3200
3201 /* Returns 1 if f1's filename has all of f2's filename as a prefix.  This does
3202  * not match if f2's basename is not an exact match of a path element in f1.
3203  * E.g. /path/foo is not a prefix of /path/foobar/baz, but /path/foobar is. */
3204 int f_name_has_prefix(const struct file_struct *f1, const struct file_struct *f2)
3205 {
3206         found_prefix = 0;
3207         f_name_cmp(f1, f2);
3208         return found_prefix;
3209 }
3210
3211 char *f_name_buf(void)
3212 {
3213         static char names[5][MAXPATHLEN];
3214         static unsigned int n;
3215
3216         n = (n + 1) % (sizeof names / sizeof names[0]);
3217
3218         return names[n];
3219 }
3220
3221 /* Return a copy of the full filename of a flist entry, using the indicated
3222  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
3223  * done because we checked the size when creating the file_struct entry.
3224  */
3225 char *f_name(const struct file_struct *f, char *fbuf)
3226 {
3227         if (!f || !F_IS_ACTIVE(f))
3228                 return NULL;
3229
3230         if (!fbuf)
3231                 fbuf = f_name_buf();
3232
3233         if (f->dirname) {
3234                 int len = strlen(f->dirname);
3235                 memcpy(fbuf, f->dirname, len);
3236                 fbuf[len] = '/';
3237                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
3238         } else
3239                 strlcpy(fbuf, f->basename, MAXPATHLEN);
3240
3241         return fbuf;
3242 }
3243
3244 /* Do a non-recursive scan of the named directory, possibly ignoring all
3245  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
3246  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
3247  * buffer (the functions we call will append names onto the end, but the old
3248  * dir value will be restored on exit). */
3249 struct file_list *get_dirlist(char *dirname, int dlen, int flags)
3250 {
3251         struct file_list *dirlist;
3252         char dirbuf[MAXPATHLEN];
3253         int save_recurse = recurse;
3254         int save_xfer_dirs = xfer_dirs;
3255         int save_prune_empty_dirs = prune_empty_dirs;
3256         int senddir_fd = flags & GDL_IGNORE_FILTER_RULES ? -2 : -1;
3257         int senddir_flags = FLAG_CONTENT_DIR;
3258
3259         if (dlen < 0) {
3260                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
3261                 if (dlen >= MAXPATHLEN)
3262                         return NULL;
3263                 dirname = dirbuf;
3264         }
3265
3266         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
3267
3268         if (flags & GDL_PERHAPS_DIR)
3269                 senddir_flags |= FLAG_PERHAPS_DIR;
3270
3271         recurse = 0;
3272         xfer_dirs = 1;
3273         send_directory(senddir_fd, dirlist, dirname, dlen, senddir_flags);
3274         xfer_dirs = save_xfer_dirs;
3275         recurse = save_recurse;
3276         if (INFO_GTE(PROGRESS, 1))
3277                 flist_count_offset += dirlist->used;
3278
3279         prune_empty_dirs = 0;
3280         dirlist->sorted = dirlist->files;
3281         flist_sort_and_clean(dirlist, 0);
3282         prune_empty_dirs = save_prune_empty_dirs;
3283
3284         if (DEBUG_GTE(FLIST, 3))
3285                 output_flist(dirlist);
3286
3287         return dirlist;
3288 }