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