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